drivers/scsi/hpsa.c

   1 /*
   2  *    Disk Array driver for HP Smart Array SAS controllers
   3  *    Copyright 2000, 2009 Hewlett-Packard Development Company, L.P.
   4  *
   5  *    This program is free software; you can redistribute it and/or modify
   6  *    it under the terms of the GNU General Public License as published by
   7  *    the Free Software Foundation; version 2 of the License.
   8  *
   9  *    This program is distributed in the hope that it will be useful,
  10  *    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *    MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  12  *    NON INFRINGEMENT.  See the GNU General Public License for more details.
  13  *
  14  *    You should have received a copy of the GNU General Public License
  15  *    along with this program; if not, write to the Free Software
  16  *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  17  *
  18  *    Questions/Comments/Bugfixes to iss_storagedev@hp.com
  19  *
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/types.h>
  25 #include <linux/pci.h>
  26 #include <linux/kernel.h>
  27 #include <linux/slab.h>
  28 #include <linux/delay.h>
  29 #include <linux/fs.h>
  30 #include <linux/timer.h>
  31 #include <linux/seq_file.h>
  32 #include <linux/init.h>
  33 #include <linux/spinlock.h>
  34 #include <linux/smp_lock.h>
  35 #include <linux/compat.h>
  36 #include <linux/blktrace_api.h>
  37 #include <linux/uaccess.h>
  38 #include <linux/io.h>
  39 #include <linux/dma-mapping.h>
  40 #include <linux/completion.h>
  41 #include <linux/moduleparam.h>
  42 #include <scsi/scsi.h>
  43 #include <scsi/scsi_cmnd.h>
  44 #include <scsi/scsi_device.h>
  45 #include <scsi/scsi_host.h>
  46 #include <scsi/scsi_tcq.h>
  47 #include <linux/cciss_ioctl.h>
  48 #include <linux/string.h>
  49 #include <linux/bitmap.h>
  50 #include <asm/atomic.h>
  51 #include <linux/kthread.h>
  52 #include "hpsa_cmd.h"
  53 #include "hpsa.h"
  54
  55 /* HPSA_DRIVER_VERSION must be 3 byte values (0-255) separated by '.' */
  56 #define HPSA_DRIVER_VERSION "2.0.2-1"
  57 #define DRIVER_NAME "HP HPSA Driver (v " HPSA_DRIVER_VERSION ")"
  58
  59 /* How long to wait (in milliseconds) for board to go into simple mode */
  60 #define MAX_CONFIG_WAIT 30000
  61 #define MAX_IOCTL_CONFIG_WAIT 1000
  62
  63 /*define how many times we will try a command because of bus resets */
  64 #define MAX_CMD_RETRIES 3
  65
  66 /* Embedded module documentation macros - see modules.h */
  67 MODULE_AUTHOR("Hewlett-Packard Company");
  68 MODULE_DESCRIPTION("Driver for HP Smart Array Controller version " \
  69         HPSA_DRIVER_VERSION);
  70 MODULE_SUPPORTED_DEVICE("HP Smart Array Controllers");
  71 MODULE_VERSION(HPSA_DRIVER_VERSION);
  72 MODULE_LICENSE("GPL");
  73
  74 static int hpsa_allow_any;
  75 module_param(hpsa_allow_any, int, S_IRUGO|S_IWUSR);
  76 MODULE_PARM_DESC(hpsa_allow_any,
  77                 "Allow hpsa driver to access unknown HP Smart Array hardware");
  78
  79 /* define the PCI info for the cards we can control */
  80 static const struct pci_device_id hpsa_pci_device_id[] = {
  81         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3241},
  82         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3243},
  83         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3245},
  84         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3247},
  85         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3249},
  86         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x324a},
  87         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x324b},
  88         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3233},
  89         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3250},
  90         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3251},
  91         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3252},
  92         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3253},
  93         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSE,     0x103C, 0x3254},
  94 #define PCI_DEVICE_ID_HP_CISSF 0x333f
  95         {PCI_VENDOR_ID_HP,     PCI_DEVICE_ID_HP_CISSF,     0x103C, 0x333F},
  96         {PCI_VENDOR_ID_HP,     PCI_ANY_ID,             PCI_ANY_ID, PCI_ANY_ID,
  97                 PCI_CLASS_STORAGE_RAID << 8, 0xffff << 8, 0},
  98         {PCI_VENDOR_ID_COMPAQ,     PCI_ANY_ID,             PCI_ANY_ID, PCI_ANY_ID,
  99                 PCI_CLASS_STORAGE_RAID << 8, 0xffff << 8, 0},
 100         {0,}
 101 };
 102
 103 MODULE_DEVICE_TABLE(pci, hpsa_pci_device_id);
 104
 105 /*  board_id = Subsystem Device ID & Vendor ID
 106  *  product = Marketing Name for the board
 107  *  access = Address of the struct of function pointers
 108  */
 109 static struct board_type products[] = {
 110         {0x3241103C, "Smart Array P212", &SA5_access},
 111         {0x3243103C, "Smart Array P410", &SA5_access},
 112         {0x3245103C, "Smart Array P410i", &SA5_access},
 113         {0x3247103C, "Smart Array P411", &SA5_access},
 114         {0x3249103C, "Smart Array P812", &SA5_access},
 115         {0x324a103C, "Smart Array P712m", &SA5_access},
 116         {0x324b103C, "Smart Array P711m", &SA5_access},
 117         {0x3233103C, "StorageWorks P1210m", &SA5_access},
 118         {0x333F103C, "StorageWorks P1210m", &SA5_access},
 119         {0x3250103C, "Smart Array", &SA5_access},
 120         {0x3250113C, "Smart Array", &SA5_access},
 121         {0x3250123C, "Smart Array", &SA5_access},
 122         {0x3250133C, "Smart Array", &SA5_access},
 123         {0x3250143C, "Smart Array", &SA5_access},
 124         {0xFFFF103C, "Unknown Smart Array", &SA5_access},
 125 };
 126
 127 static int number_of_controllers;
 128
 129 static irqreturn_t do_hpsa_intr_intx(int irq, void *dev_id);
 130 static irqreturn_t do_hpsa_intr_msi(int irq, void *dev_id);
 131 static int hpsa_ioctl(struct scsi_device *dev, int cmd, void *arg);
 132 static void start_io(struct ctlr_info *h);
 133
 134 #ifdef CONFIG_COMPAT
 135 static int hpsa_compat_ioctl(struct scsi_device *dev, int cmd, void *arg);
 136 #endif
 137
 138 static void cmd_free(struct ctlr_info *h, struct CommandList *c);
 139 static void cmd_special_free(struct ctlr_info *h, struct CommandList *c);
 140 static struct CommandList *cmd_alloc(struct ctlr_info *h);
 141 static struct CommandList *cmd_special_alloc(struct ctlr_info *h);
 142 static void fill_cmd(struct CommandList *c, u8 cmd, struct ctlr_info *h,
 143         void *buff, size_t size, u8 page_code, unsigned char *scsi3addr,
 144         int cmd_type);
 145
 146 static int hpsa_scsi_queue_command(struct Scsi_Host *h, struct scsi_cmnd *cmd);
 147 static void hpsa_scan_start(struct Scsi_Host *);
 148 static int hpsa_scan_finished(struct Scsi_Host *sh,
 149         unsigned long elapsed_time);
 150 static int hpsa_change_queue_depth(struct scsi_device *sdev,
 151         int qdepth, int reason);
 152
 153 static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd);
 154 static int hpsa_slave_alloc(struct scsi_device *sdev);
 155 static void hpsa_slave_destroy(struct scsi_device *sdev);
 156
 157 static ssize_t raid_level_show(struct device *dev,
 158         struct device_attribute *attr, char *buf);
 159 static ssize_t lunid_show(struct device *dev,
 160         struct device_attribute *attr, char *buf);
 161 static ssize_t unique_id_show(struct device *dev,
 162         struct device_attribute *attr, char *buf);
 163 static ssize_t host_show_firmware_revision(struct device *dev,
 164              struct device_attribute *attr, char *buf);
 165 static void hpsa_update_scsi_devices(struct ctlr_info *h, int hostno);
 166 static ssize_t host_store_rescan(struct device *dev,
 167          struct device_attribute *attr, const char *buf, size_t count);
 168 static int check_for_unit_attention(struct ctlr_info *h,
 169         struct CommandList *c);
 170 static void check_ioctl_unit_attention(struct ctlr_info *h,
 171         struct CommandList *c);
 172 /* performant mode helper functions */
 173 static void calc_bucket_map(int *bucket, int num_buckets,
 174         int nsgs, int *bucket_map);
 175 static __devinit void hpsa_put_ctlr_into_performant_mode(struct ctlr_info *h);
 176 static inline u32 next_command(struct ctlr_info *h);
 177 static int __devinit hpsa_find_cfg_addrs(struct pci_dev *pdev,
 178         void __iomem *vaddr, u32 *cfg_base_addr, u64 *cfg_base_addr_index,
 179         u64 *cfg_offset);
 180 static int __devinit hpsa_pci_find_memory_BAR(struct pci_dev *pdev,
 181         unsigned long *memory_bar);
 182 static int __devinit hpsa_lookup_board_id(struct pci_dev *pdev, u32 *board_id);
 183
 184 static DEVICE_ATTR(raid_level, S_IRUGO, raid_level_show, NULL);
 185 static DEVICE_ATTR(lunid, S_IRUGO, lunid_show, NULL);
 186 static DEVICE_ATTR(unique_id, S_IRUGO, unique_id_show, NULL);
 187 static DEVICE_ATTR(rescan, S_IWUSR, NULL, host_store_rescan);
 188 static DEVICE_ATTR(firmware_revision, S_IRUGO,
 189         host_show_firmware_revision, NULL);
 190
 191 static struct device_attribute *hpsa_sdev_attrs[] = {
 192         &dev_attr_raid_level,
 193         &dev_attr_lunid,
 194         &dev_attr_unique_id,
 195         NULL,
 196 };
 197
 198 static struct device_attribute *hpsa_shost_attrs[] = {
 199         &dev_attr_rescan,
 200         &dev_attr_firmware_revision,
 201         NULL,
 202 };
 203
 204 static struct scsi_host_template hpsa_driver_template = {
 205         .module                 = THIS_MODULE,
 206         .name                   = "hpsa",
 207         .proc_name              = "hpsa",
 208         .queuecommand           = hpsa_scsi_queue_command,
 209         .scan_start             = hpsa_scan_start,
 210         .scan_finished          = hpsa_scan_finished,
 211         .change_queue_depth     = hpsa_change_queue_depth,
 212         .this_id                = -1,
 213         .use_clustering         = ENABLE_CLUSTERING,
 214         .eh_device_reset_handler = hpsa_eh_device_reset_handler,
 215         .ioctl                  = hpsa_ioctl,
 216         .slave_alloc            = hpsa_slave_alloc,
 217         .slave_destroy          = hpsa_slave_destroy,
 218 #ifdef CONFIG_COMPAT
 219         .compat_ioctl           = hpsa_compat_ioctl,
 220 #endif
 221         .sdev_attrs = hpsa_sdev_attrs,
 222         .shost_attrs = hpsa_shost_attrs,
 223 };
 224
 225 static inline struct ctlr_info *sdev_to_hba(struct scsi_device *sdev)
 226 {
 227         unsigned long *priv = shost_priv(sdev->host);
 228         return (struct ctlr_info *) *priv;
 229 }
 230
 231 static inline struct ctlr_info *shost_to_hba(struct Scsi_Host *sh)
 232 {
 233         unsigned long *priv = shost_priv(sh);
 234         return (struct ctlr_info *) *priv;
 235 }
 236
 237 static int check_for_unit_attention(struct ctlr_info *h,
 238         struct CommandList *c)
 239 {
 240         if (c->err_info->SenseInfo[2] != UNIT_ATTENTION)
 241                 return 0;
 242
 243         switch (c->err_info->SenseInfo[12]) {
 244         case STATE_CHANGED:
 245                 dev_warn(&h->pdev->dev, "hpsa%d: a state change "
 246                         "detected, command retried\n", h->ctlr);
 247                 break;
 248         case LUN_FAILED:
 249                 dev_warn(&h->pdev->dev, "hpsa%d: LUN failure "
 250                         "detected, action required\n", h->ctlr);
 251                 break;
 252         case REPORT_LUNS_CHANGED:
 253                 dev_warn(&h->pdev->dev, "hpsa%d: report LUN data "
 254                         "changed, action required\n", h->ctlr);
 255         /*
 256          * Note: this REPORT_LUNS_CHANGED condition only occurs on the MSA2012.
 257          */
 258                 break;
 259         case POWER_OR_RESET:
 260                 dev_warn(&h->pdev->dev, "hpsa%d: a power on "
 261                         "or device reset detected\n", h->ctlr);
 262                 break;
 263         case UNIT_ATTENTION_CLEARED:
 264                 dev_warn(&h->pdev->dev, "hpsa%d: unit attention "
 265                     "cleared by another initiator\n", h->ctlr);
 266                 break;
 267         default:
 268                 dev_warn(&h->pdev->dev, "hpsa%d: unknown "
 269                         "unit attention detected\n", h->ctlr);
 270                 break;
 271         }
 272         return 1;
 273 }
 274
 275 static ssize_t host_store_rescan(struct device *dev,
 276                                  struct device_attribute *attr,
 277                                  const char *buf, size_t count)
 278 {
 279         struct ctlr_info *h;
 280         struct Scsi_Host *shost = class_to_shost(dev);
 281         h = shost_to_hba(shost);
 282         hpsa_scan_start(h->scsi_host);
 283         return count;
 284 }
 285
 286 static ssize_t host_show_firmware_revision(struct device *dev,
 287              struct device_attribute *attr, char *buf)
 288 {
 289         struct ctlr_info *h;
 290         struct Scsi_Host *shost = class_to_shost(dev);
 291         unsigned char *fwrev;
 292
 293         h = shost_to_hba(shost);
 294         if (!h->hba_inquiry_data)
 295                 return 0;
 296         fwrev = &h->hba_inquiry_data[32];
 297         return snprintf(buf, 20, "%c%c%c%c\n",
 298                 fwrev[0], fwrev[1], fwrev[2], fwrev[3]);
 299 }
 300
 301 /* Enqueuing and dequeuing functions for cmdlists. */
 302 static inline void addQ(struct hlist_head *list, struct CommandList *c)
 303 {
 304         hlist_add_head(&c->list, list);
 305 }
 306
 307 static inline u32 next_command(struct ctlr_info *h)
 308 {
 309         u32 a;
 310
 311         if (unlikely(h->transMethod != CFGTBL_Trans_Performant))
 312                 return h->access.command_completed(h);
 313
 314         if ((*(h->reply_pool_head) & 1) == (h->reply_pool_wraparound)) {
 315                 a = *(h->reply_pool_head); /* Next cmd in ring buffer */
 316                 (h->reply_pool_head)++;
 317                 h->commands_outstanding--;
 318         } else {
 319                 a = FIFO_EMPTY;
 320         }
 321         /* Check for wraparound */
 322         if (h->reply_pool_head == (h->reply_pool + h->max_commands)) {
 323                 h->reply_pool_head = h->reply_pool;
 324                 h->reply_pool_wraparound ^= 1;
 325         }
 326         return a;
 327 }
 328
 329 /* set_performant_mode: Modify the tag for cciss performant
 330  * set bit 0 for pull model, bits 3-1 for block fetch
 331  * register number
 332  */
 333 static void set_performant_mode(struct ctlr_info *h, struct CommandList *c)
 334 {
 335         if (likely(h->transMethod == CFGTBL_Trans_Performant))
 336                 c->busaddr |= 1 | (h->blockFetchTable[c->Header.SGList] << 1);
 337 }
 338
 339 static void enqueue_cmd_and_start_io(struct ctlr_info *h,
 340         struct CommandList *c)
 341 {
 342         unsigned long flags;
 343
 344         set_performant_mode(h, c);
 345         spin_lock_irqsave(&h->lock, flags);
 346         addQ(&h->reqQ, c);
 347         h->Qdepth++;
 348         start_io(h);
 349         spin_unlock_irqrestore(&h->lock, flags);
 350 }
 351
 352 static inline void removeQ(struct CommandList *c)
 353 {
 354         if (WARN_ON(hlist_unhashed(&c->list)))
 355                 return;
 356         hlist_del_init(&c->list);
 357 }
 358
 359 static inline int is_hba_lunid(unsigned char scsi3addr[])
 360 {
 361         return memcmp(scsi3addr, RAID_CTLR_LUNID, 8) == 0;
 362 }
 363
 364 static inline int is_logical_dev_addr_mode(unsigned char scsi3addr[])
 365 {
 366         return (scsi3addr[3] & 0xC0) == 0x40;
 367 }
 368
 369 static inline int is_scsi_rev_5(struct ctlr_info *h)
 370 {
 371         if (!h->hba_inquiry_data)
 372                 return 0;
 373         if ((h->hba_inquiry_data[2] & 0x07) == 5)
 374                 return 1;
 375         return 0;
 376 }
 377
 378 static const char *raid_label[] = { "0", "4", "1(1+0)", "5", "5+1", "ADG",
 379         "UNKNOWN"
 380 };
 381 #define RAID_UNKNOWN (ARRAY_SIZE(raid_label) - 1)
 382
 383 static ssize_t raid_level_show(struct device *dev,
 384              struct device_attribute *attr, char *buf)
 385 {
 386         ssize_t l = 0;
 387         unsigned char rlevel;
 388         struct ctlr_info *h;
 389         struct scsi_device *sdev;
 390         struct hpsa_scsi_dev_t *hdev;
 391         unsigned long flags;
 392
 393         sdev = to_scsi_device(dev);
 394         h = sdev_to_hba(sdev);
 395         spin_lock_irqsave(&h->lock, flags);
 396         hdev = sdev->hostdata;
 397         if (!hdev) {
 398                 spin_unlock_irqrestore(&h->lock, flags);
 399                 return -ENODEV;
 400         }
 401
 402         /* Is this even a logical drive? */
 403         if (!is_logical_dev_addr_mode(hdev->scsi3addr)) {
 404                 spin_unlock_irqrestore(&h->lock, flags);
 405                 l = snprintf(buf, PAGE_SIZE, "N/A\n");
 406                 return l;
 407         }
 408
 409         rlevel = hdev->raid_level;
 410         spin_unlock_irqrestore(&h->lock, flags);
 411         if (rlevel > RAID_UNKNOWN)
 412                 rlevel = RAID_UNKNOWN;
 413         l = snprintf(buf, PAGE_SIZE, "RAID %s\n", raid_label[rlevel]);
 414         return l;
 415 }
 416
 417 static ssize_t lunid_show(struct device *dev,
 418              struct device_attribute *attr, char *buf)
 419 {
 420         struct ctlr_info *h;
 421         struct scsi_device *sdev;
 422         struct hpsa_scsi_dev_t *hdev;
 423         unsigned long flags;
 424         unsigned char lunid[8];
 425
 426         sdev = to_scsi_device(dev);
 427         h = sdev_to_hba(sdev);
 428         spin_lock_irqsave(&h->lock, flags);
 429         hdev = sdev->hostdata;
 430         if (!hdev) {
 431                 spin_unlock_irqrestore(&h->lock, flags);
 432                 return -ENODEV;
 433         }
 434         memcpy(lunid, hdev->scsi3addr, sizeof(lunid));
 435         spin_unlock_irqrestore(&h->lock, flags);
 436         return snprintf(buf, 20, "0x%02x%02x%02x%02x%02x%02x%02x%02x\n",
 437                 lunid[0], lunid[1], lunid[2], lunid[3],
 438                 lunid[4], lunid[5], lunid[6], lunid[7]);
 439 }
 440
 441 static ssize_t unique_id_show(struct device *dev,
 442              struct device_attribute *attr, char *buf)
 443 {
 444         struct ctlr_info *h;
 445         struct scsi_device *sdev;
 446         struct hpsa_scsi_dev_t *hdev;
 447         unsigned long flags;
 448         unsigned char sn[16];
 449
 450         sdev = to_scsi_device(dev);
 451         h = sdev_to_hba(sdev);
 452         spin_lock_irqsave(&h->lock, flags);
 453         hdev = sdev->hostdata;
 454         if (!hdev) {
 455                 spin_unlock_irqrestore(&h->lock, flags);
 456                 return -ENODEV;
 457         }
 458         memcpy(sn, hdev->device_id, sizeof(sn));
 459         spin_unlock_irqrestore(&h->lock, flags);
 460         return snprintf(buf, 16 * 2 + 2,
 461                         "%02X%02X%02X%02X%02X%02X%02X%02X"
 462                         "%02X%02X%02X%02X%02X%02X%02X%02X\n",
 463                         sn[0], sn[1], sn[2], sn[3],
 464                         sn[4], sn[5], sn[6], sn[7],
 465                         sn[8], sn[9], sn[10], sn[11],
 466                         sn[12], sn[13], sn[14], sn[15]);
 467 }
 468
 469 static int hpsa_find_target_lun(struct ctlr_info *h,
 470         unsigned char scsi3addr[], int bus, int *target, int *lun)
 471 {
 472         /* finds an unused bus, target, lun for a new physical device
 473          * assumes h->devlock is held
 474          */
 475         int i, found = 0;
 476         DECLARE_BITMAP(lun_taken, HPSA_MAX_SCSI_DEVS_PER_HBA);
 477
 478         memset(&lun_taken[0], 0, HPSA_MAX_SCSI_DEVS_PER_HBA >> 3);
 479
 480         for (i = 0; i < h->ndevices; i++) {
 481                 if (h->dev[i]->bus == bus && h->dev[i]->target != -1)
 482                         set_bit(h->dev[i]->target, lun_taken);
 483         }
 484
 485         for (i = 0; i < HPSA_MAX_SCSI_DEVS_PER_HBA; i++) {
 486                 if (!test_bit(i, lun_taken)) {
 487                         /* *bus = 1; */
 488                         *target = i;
 489                         *lun = 0;
 490                         found = 1;
 491                         break;
 492                 }
 493         }
 494         return !found;
 495 }
 496
 497 /* Add an entry into h->dev[] array. */
 498 static int hpsa_scsi_add_entry(struct ctlr_info *h, int hostno,
 499                 struct hpsa_scsi_dev_t *device,
 500                 struct hpsa_scsi_dev_t *added[], int *nadded)
 501 {
 502         /* assumes h->devlock is held */
 503         int n = h->ndevices;
 504         int i;
 505         unsigned char addr1[8], addr2[8];
 506         struct hpsa_scsi_dev_t *sd;
 507
 508         if (n >= HPSA_MAX_SCSI_DEVS_PER_HBA) {
 509                 dev_err(&h->pdev->dev, "too many devices, some will be "
 510                         "inaccessible.\n");
 511                 return -1;
 512         }
 513
 514         /* physical devices do not have lun or target assigned until now. */
 515         if (device->lun != -1)
 516                 /* Logical device, lun is already assigned. */
 517                 goto lun_assigned;
 518
 519         /* If this device a non-zero lun of a multi-lun device
 520          * byte 4 of the 8-byte LUN addr will contain the logical
 521          * unit no, zero otherise.
 522          */
 523         if (device->scsi3addr[4] == 0) {
 524                 /* This is not a non-zero lun of a multi-lun device */
 525                 if (hpsa_find_target_lun(h, device->scsi3addr,
 526                         device->bus, &device->target, &device->lun) != 0)
 527                         return -1;
 528                 goto lun_assigned;
 529         }
 530
 531         /* This is a non-zero lun of a multi-lun device.
 532          * Search through our list and find the device which
 533          * has the same 8 byte LUN address, excepting byte 4.
 534          * Assign the same bus and target for this new LUN.
 535          * Use the logical unit number from the firmware.
 536          */
 537         memcpy(addr1, device->scsi3addr, 8);
 538         addr1[4] = 0;
 539         for (i = 0; i < n; i++) {
 540                 sd = h->dev[i];
 541                 memcpy(addr2, sd->scsi3addr, 8);
 542                 addr2[4] = 0;
 543                 /* differ only in byte 4? */
 544                 if (memcmp(addr1, addr2, 8) == 0) {
 545                         device->bus = sd->bus;
 546                         device->target = sd->target;
 547                         device->lun = device->scsi3addr[4];
 548                         break;
 549                 }
 550         }
 551         if (device->lun == -1) {
 552                 dev_warn(&h->pdev->dev, "physical device with no LUN=0,"
 553                         " suspect firmware bug or unsupported hardware "
 554                         "configuration.\n");
 555                         return -1;
 556         }
 557
 558 lun_assigned:
 559
 560         h->dev[n] = device;
 561         h->ndevices++;
 562         added[*nadded] = device;
 563         (*nadded)++;
 564
 565         /* initially, (before registering with scsi layer) we don't
 566          * know our hostno and we don't want to print anything first
 567          * time anyway (the scsi layer's inquiries will show that info)
 568          */
 569         /* if (hostno != -1) */
 570                 dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d added.\n",
 571                         scsi_device_type(device->devtype), hostno,
 572                         device->bus, device->target, device->lun);
 573         return 0;
 574 }
 575
 576 /* Replace an entry from h->dev[] array. */
 577 static void hpsa_scsi_replace_entry(struct ctlr_info *h, int hostno,
 578         int entry, struct hpsa_scsi_dev_t *new_entry,
 579         struct hpsa_scsi_dev_t *added[], int *nadded,
 580         struct hpsa_scsi_dev_t *removed[], int *nremoved)
 581 {
 582         /* assumes h->devlock is held */
 583         BUG_ON(entry < 0 || entry >= HPSA_MAX_SCSI_DEVS_PER_HBA);
 584         removed[*nremoved] = h->dev[entry];
 585         (*nremoved)++;
 586         h->dev[entry] = new_entry;
 587         added[*nadded] = new_entry;
 588         (*nadded)++;
 589         dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d changed.\n",
 590                 scsi_device_type(new_entry->devtype), hostno, new_entry->bus,
 591                         new_entry->target, new_entry->lun);
 592 }
 593
 594 /* Remove an entry from h->dev[] array. */
 595 static void hpsa_scsi_remove_entry(struct ctlr_info *h, int hostno, int entry,
 596         struct hpsa_scsi_dev_t *removed[], int *nremoved)
 597 {
 598         /* assumes h->devlock is held */
 599         int i;
 600         struct hpsa_scsi_dev_t *sd;
 601
 602         BUG_ON(entry < 0 || entry >= HPSA_MAX_SCSI_DEVS_PER_HBA);
 603
 604         sd = h->dev[entry];
 605         removed[*nremoved] = h->dev[entry];
 606         (*nremoved)++;
 607
 608         for (i = entry; i < h->ndevices-1; i++)
 609                 h->dev[i] = h->dev[i+1];
 610         h->ndevices--;
 611         dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d removed.\n",
 612                 scsi_device_type(sd->devtype), hostno, sd->bus, sd->target,
 613                 sd->lun);
 614 }
 615
 616 #define SCSI3ADDR_EQ(a, b) ( \
 617         (a)[7] == (b)[7] && \
 618         (a)[6] == (b)[6] && \
 619         (a)[5] == (b)[5] && \
 620         (a)[4] == (b)[4] && \
 621         (a)[3] == (b)[3] && \
 622         (a)[2] == (b)[2] && \
 623         (a)[1] == (b)[1] && \
 624         (a)[0] == (b)[0])
 625
 626 static void fixup_botched_add(struct ctlr_info *h,
 627         struct hpsa_scsi_dev_t *added)
 628 {
 629         /* called when scsi_add_device fails in order to re-adjust
 630          * h->dev[] to match the mid layer's view.
 631          */
 632         unsigned long flags;
 633         int i, j;
 634
 635         spin_lock_irqsave(&h->lock, flags);
 636         for (i = 0; i < h->ndevices; i++) {
 637                 if (h->dev[i] == added) {
 638                         for (j = i; j < h->ndevices-1; j++)
 639                                 h->dev[j] = h->dev[j+1];
 640                         h->ndevices--;
 641                         break;
 642                 }
 643         }
 644         spin_unlock_irqrestore(&h->lock, flags);
 645         kfree(added);
 646 }
 647
 648 static inline int device_is_the_same(struct hpsa_scsi_dev_t *dev1,
 649         struct hpsa_scsi_dev_t *dev2)
 650 {
 651         if ((is_logical_dev_addr_mode(dev1->scsi3addr) ||
 652                 (dev1->lun != -1 && dev2->lun != -1)) &&
 653                 dev1->devtype != 0x0C)
 654                 return (memcmp(dev1, dev2, sizeof(*dev1)) == 0);
 655
 656         /* we compare everything except lun and target as these
 657          * are not yet assigned.  Compare parts likely
 658          * to differ first
 659          */
 660         if (memcmp(dev1->scsi3addr, dev2->scsi3addr,
 661                 sizeof(dev1->scsi3addr)) != 0)
 662                 return 0;
 663         if (memcmp(dev1->device_id, dev2->device_id,
 664                 sizeof(dev1->device_id)) != 0)
 665                 return 0;
 666         if (memcmp(dev1->model, dev2->model, sizeof(dev1->model)) != 0)
 667                 return 0;
 668         if (memcmp(dev1->vendor, dev2->vendor, sizeof(dev1->vendor)) != 0)
 669                 return 0;
 670         if (memcmp(dev1->revision, dev2->revision, sizeof(dev1->revision)) != 0)
 671                 return 0;
 672         if (dev1->devtype != dev2->devtype)
 673                 return 0;
 674         if (dev1->raid_level != dev2->raid_level)
 675                 return 0;
 676         if (dev1->bus != dev2->bus)
 677                 return 0;
 678         return 1;
 679 }
 680
 681 /* Find needle in haystack.  If exact match found, return DEVICE_SAME,
 682  * and return needle location in *index.  If scsi3addr matches, but not
 683  * vendor, model, serial num, etc. return DEVICE_CHANGED, and return needle
 684  * location in *index.  If needle not found, return DEVICE_NOT_FOUND.
 685  */
 686 static int hpsa_scsi_find_entry(struct hpsa_scsi_dev_t *needle,
 687         struct hpsa_scsi_dev_t *haystack[], int haystack_size,
 688         int *index)
 689 {
 690         int i;
 691 #define DEVICE_NOT_FOUND 0
 692 #define DEVICE_CHANGED 1
 693 #define DEVICE_SAME 2
 694         for (i = 0; i < haystack_size; i++) {
 695                 if (haystack[i] == NULL) /* previously removed. */
 696                         continue;
 697                 if (SCSI3ADDR_EQ(needle->scsi3addr, haystack[i]->scsi3addr)) {
 698                         *index = i;
 699                         if (device_is_the_same(needle, haystack[i]))
 700                                 return DEVICE_SAME;
 701                         else
 702                                 return DEVICE_CHANGED;
 703                 }
 704         }
 705         *index = -1;
 706         return DEVICE_NOT_FOUND;
 707 }
 708
 709 static void adjust_hpsa_scsi_table(struct ctlr_info *h, int hostno,
 710         struct hpsa_scsi_dev_t *sd[], int nsds)
 711 {
 712         /* sd contains scsi3 addresses and devtypes, and inquiry
 713          * data.  This function takes what's in sd to be the current
 714          * reality and updates h->dev[] to reflect that reality.
 715          */
 716         int i, entry, device_change, changes = 0;
 717         struct hpsa_scsi_dev_t *csd;
 718         unsigned long flags;
 719         struct hpsa_scsi_dev_t **added, **removed;
 720         int nadded, nremoved;
 721         struct Scsi_Host *sh = NULL;
 722
 723         added = kzalloc(sizeof(*added) * HPSA_MAX_SCSI_DEVS_PER_HBA,
 724                 GFP_KERNEL);
 725         removed = kzalloc(sizeof(*removed) * HPSA_MAX_SCSI_DEVS_PER_HBA,
 726                 GFP_KERNEL);
 727
 728         if (!added || !removed) {
 729                 dev_warn(&h->pdev->dev, "out of memory in "
 730                         "adjust_hpsa_scsi_table\n");
 731                 goto free_and_out;
 732         }
 733
 734         spin_lock_irqsave(&h->devlock, flags);
 735
 736         /* find any devices in h->dev[] that are not in
 737          * sd[] and remove them from h->dev[], and for any
 738          * devices which have changed, remove the old device
 739          * info and add the new device info.
 740          */
 741         i = 0;
 742         nremoved = 0;
 743         nadded = 0;
 744         while (i < h->ndevices) {
 745                 csd = h->dev[i];
 746                 device_change = hpsa_scsi_find_entry(csd, sd, nsds, &entry);
 747                 if (device_change == DEVICE_NOT_FOUND) {
 748                         changes++;
 749                         hpsa_scsi_remove_entry(h, hostno, i,
 750                                 removed, &nremoved);
 751                         continue; /* remove ^^^, hence i not incremented */
 752                 } else if (device_change == DEVICE_CHANGED) {
 753                         changes++;
 754                         hpsa_scsi_replace_entry(h, hostno, i, sd[entry],
 755                                 added, &nadded, removed, &nremoved);
 756                         /* Set it to NULL to prevent it from being freed
 757                          * at the bottom of hpsa_update_scsi_devices()
 758                          */
 759                         sd[entry] = NULL;
 760                 }
 761                 i++;
 762         }
 763
 764         /* Now, make sure every device listed in sd[] is also
 765          * listed in h->dev[], adding them if they aren't found
 766          */
 767
 768         for (i = 0; i < nsds; i++) {
 769                 if (!sd[i]) /* if already added above. */
 770                         continue;
 771                 device_change = hpsa_scsi_find_entry(sd[i], h->dev,
 772                                         h->ndevices, &entry);
 773                 if (device_change == DEVICE_NOT_FOUND) {
 774                         changes++;
 775                         if (hpsa_scsi_add_entry(h, hostno, sd[i],
 776                                 added, &nadded) != 0)
 777                                 break;
 778                         sd[i] = NULL; /* prevent from being freed later. */
 779                 } else if (device_change == DEVICE_CHANGED) {
 780                         /* should never happen... */
 781                         changes++;
 782                         dev_warn(&h->pdev->dev,
 783                                 "device unexpectedly changed.\n");
 784                         /* but if it does happen, we just ignore that device */
 785                 }
 786         }
 787         spin_unlock_irqrestore(&h->devlock, flags);
 788
 789         /* Don't notify scsi mid layer of any changes the first time through
 790          * (or if there are no changes) scsi_scan_host will do it later the
 791          * first time through.
 792          */
 793         if (hostno == -1 || !changes)
 794                 goto free_and_out;
 795
 796         sh = h->scsi_host;
 797         /* Notify scsi mid layer of any removed devices */
 798         for (i = 0; i < nremoved; i++) {
 799                 struct scsi_device *sdev =
 800                         scsi_device_lookup(sh, removed[i]->bus,
 801                                 removed[i]->target, removed[i]->lun);
 802                 if (sdev != NULL) {
 803                         scsi_remove_device(sdev);
 804                         scsi_device_put(sdev);
 805                 } else {
 806                         /* We don't expect to get here.
 807                          * future cmds to this device will get selection
 808                          * timeout as if the device was gone.
 809                          */
 810                         dev_warn(&h->pdev->dev, "didn't find c%db%dt%dl%d "
 811                                 " for removal.", hostno, removed[i]->bus,
 812                                 removed[i]->target, removed[i]->lun);
 813                 }
 814                 kfree(removed[i]);
 815                 removed[i] = NULL;
 816         }
 817
 818         /* Notify scsi mid layer of any added devices */
 819         for (i = 0; i < nadded; i++) {
 820                 if (scsi_add_device(sh, added[i]->bus,
 821                         added[i]->target, added[i]->lun) == 0)
 822                         continue;
 823                 dev_warn(&h->pdev->dev, "scsi_add_device c%db%dt%dl%d failed, "
 824                         "device not added.\n", hostno, added[i]->bus,
 825                         added[i]->target, added[i]->lun);
 826                 /* now we have to remove it from h->dev,
 827                  * since it didn't get added to scsi mid layer
 828                  */
 829                 fixup_botched_add(h, added[i]);
 830         }
 831
 832 free_and_out:
 833         kfree(added);
 834         kfree(removed);
 835 }
 836
 837 /*
 838  * Lookup bus/target/lun and retrun corresponding struct hpsa_scsi_dev_t *
 839  * Assume's h->devlock is held.
 840  */
 841 static struct hpsa_scsi_dev_t *lookup_hpsa_scsi_dev(struct ctlr_info *h,
 842         int bus, int target, int lun)
 843 {
 844         int i;
 845         struct hpsa_scsi_dev_t *sd;
 846
 847         for (i = 0; i < h->ndevices; i++) {
 848                 sd = h->dev[i];
 849                 if (sd->bus == bus && sd->target == target && sd->lun == lun)
 850                         return sd;
 851         }
 852         return NULL;
 853 }
 854
 855 /* link sdev->hostdata to our per-device structure. */
 856 static int hpsa_slave_alloc(struct scsi_device *sdev)
 857 {
 858         struct hpsa_scsi_dev_t *sd;
 859         unsigned long flags;
 860         struct ctlr_info *h;
 861
 862         h = sdev_to_hba(sdev);
 863         spin_lock_irqsave(&h->devlock, flags);
 864         sd = lookup_hpsa_scsi_dev(h, sdev_channel(sdev),
 865                 sdev_id(sdev), sdev->lun);
 866         if (sd != NULL)
 867                 sdev->hostdata = sd;
 868         spin_unlock_irqrestore(&h->devlock, flags);
 869         return 0;
 870 }
 871
 872 static void hpsa_slave_destroy(struct scsi_device *sdev)
 873 {
 874         /* nothing to do. */
 875 }
 876
 877 static void hpsa_scsi_setup(struct ctlr_info *h)
 878 {
 879         h->ndevices = 0;
 880         h->scsi_host = NULL;
 881         spin_lock_init(&h->devlock);
 882 }
 883
 884 static void hpsa_free_sg_chain_blocks(struct ctlr_info *h)
 885 {
 886         int i;
 887
 888         if (!h->cmd_sg_list)
 889                 return;
 890         for (i = 0; i < h->nr_cmds; i++) {
 891                 kfree(h->cmd_sg_list[i]);
 892                 h->cmd_sg_list[i] = NULL;
 893         }
 894         kfree(h->cmd_sg_list);
 895         h->cmd_sg_list = NULL;
 896 }
 897
 898 static int hpsa_allocate_sg_chain_blocks(struct ctlr_info *h)
 899 {
 900         int i;
 901
 902         if (h->chainsize <= 0)
 903                 return 0;
 904
 905         h->cmd_sg_list = kzalloc(sizeof(*h->cmd_sg_list) * h->nr_cmds,
 906                                 GFP_KERNEL);
 907         if (!h->cmd_sg_list)
 908                 return -ENOMEM;
 909         for (i = 0; i < h->nr_cmds; i++) {
 910                 h->cmd_sg_list[i] = kmalloc(sizeof(*h->cmd_sg_list[i]) *
 911                                                 h->chainsize, GFP_KERNEL);
 912                 if (!h->cmd_sg_list[i])
 913                         goto clean;
 914         }
 915         return 0;
 916
 917 clean:
 918         hpsa_free_sg_chain_blocks(h);
 919         return -ENOMEM;
 920 }
 921
 922 static void hpsa_map_sg_chain_block(struct ctlr_info *h,
 923         struct CommandList *c)
 924 {
 925         struct SGDescriptor *chain_sg, *chain_block;
 926         u64 temp64;
 927
 928         chain_sg = &c->SG[h->max_cmd_sg_entries - 1];
 929         chain_block = h->cmd_sg_list[c->cmdindex];
 930         chain_sg->Ext = HPSA_SG_CHAIN;
 931         chain_sg->Len = sizeof(*chain_sg) *
 932                 (c->Header.SGTotal - h->max_cmd_sg_entries);
 933         temp64 = pci_map_single(h->pdev, chain_block, chain_sg->Len,
 934                                 PCI_DMA_TODEVICE);
 935         chain_sg->Addr.lower = (u32) (temp64 & 0x0FFFFFFFFULL);
 936         chain_sg->Addr.upper = (u32) ((temp64 >> 32) & 0x0FFFFFFFFULL);
 937 }
 938
 939 static void hpsa_unmap_sg_chain_block(struct ctlr_info *h,
 940         struct CommandList *c)
 941 {
 942         struct SGDescriptor *chain_sg;
 943         union u64bit temp64;
 944
 945         if (c->Header.SGTotal <= h->max_cmd_sg_entries)
 946                 return;
 947
 948         chain_sg = &c->SG[h->max_cmd_sg_entries - 1];
 949         temp64.val32.lower = chain_sg->Addr.lower;
 950         temp64.val32.upper = chain_sg->Addr.upper;
 951         pci_unmap_single(h->pdev, temp64.val, chain_sg->Len, PCI_DMA_TODEVICE);
 952 }
 953
 954 static void complete_scsi_command(struct CommandList *cp,
 955         int timeout, u32 tag)
 956 {
 957         struct scsi_cmnd *cmd;
 958         struct ctlr_info *h;
 959         struct ErrorInfo *ei;
 960
 961         unsigned char sense_key;
 962         unsigned char asc;      /* additional sense code */
 963         unsigned char ascq;     /* additional sense code qualifier */
 964
 965         ei = cp->err_info;
 966         cmd = (struct scsi_cmnd *) cp->scsi_cmd;
 967         h = cp->h;
 968
 969         scsi_dma_unmap(cmd); /* undo the DMA mappings */
 970         if (cp->Header.SGTotal > h->max_cmd_sg_entries)
 971                 hpsa_unmap_sg_chain_block(h, cp);
 972
 973         cmd->result = (DID_OK << 16);           /* host byte */
 974         cmd->result |= (COMMAND_COMPLETE << 8); /* msg byte */
 975         cmd->result |= ei->ScsiStatus;
 976
 977         /* copy the sense data whether we need to or not. */
 978         memcpy(cmd->sense_buffer, ei->SenseInfo,
 979                 ei->SenseLen > SCSI_SENSE_BUFFERSIZE ?
 980                         SCSI_SENSE_BUFFERSIZE :
 981                         ei->SenseLen);
 982         scsi_set_resid(cmd, ei->ResidualCnt);
 983
 984         if (ei->CommandStatus == 0) {
 985                 cmd->scsi_done(cmd);
 986                 cmd_free(h, cp);
 987                 return;
 988         }
 989
 990         /* an error has occurred */
 991         switch (ei->CommandStatus) {
 992
 993         case CMD_TARGET_STATUS:
 994                 if (ei->ScsiStatus) {
 995                         /* Get sense key */
 996                         sense_key = 0xf & ei->SenseInfo[2];
 997                         /* Get additional sense code */
 998                         asc = ei->SenseInfo[12];
 999                         /* Get addition sense code qualifier */
1000                         ascq = ei->SenseInfo[13];
1001                 }
1002
1003                 if (ei->ScsiStatus == SAM_STAT_CHECK_CONDITION) {
1004                         if (check_for_unit_attention(h, cp)) {
1005                                 cmd->result = DID_SOFT_ERROR << 16;
1006                                 break;
1007                         }
1008                         if (sense_key == ILLEGAL_REQUEST) {
1009                                 /*
1010                                  * SCSI REPORT_LUNS is commonly unsupported on
1011                                  * Smart Array.  Suppress noisy complaint.
1012                                  */
1013                                 if (cp->Request.CDB[0] == REPORT_LUNS)
1014                                         break;
1015
1016                                 /* If ASC/ASCQ indicate Logical Unit
1017                                  * Not Supported condition,
1018                                  */
1019                                 if ((asc == 0x25) && (ascq == 0x0)) {
1020                                         dev_warn(&h->pdev->dev, "cp %p "
1021                                                 "has check condition\n", cp);
1022                                         break;
1023                                 }
1024                         }
1025
1026                         if (sense_key == NOT_READY) {
1027                                 /* If Sense is Not Ready, Logical Unit
1028                                  * Not ready, Manual Intervention
1029                                  * required
1030                                  */
1031                                 if ((asc == 0x04) && (ascq == 0x03)) {
1032                                         dev_warn(&h->pdev->dev, "cp %p "
1033                                                 "has check condition: unit "
1034                                                 "not ready, manual "
1035                                                 "intervention required\n", cp);
1036                                         break;
1037                                 }
1038                         }
1039                         if (sense_key == ABORTED_COMMAND) {
1040                                 /* Aborted command is retryable */
1041                                 dev_warn(&h->pdev->dev, "cp %p "
1042                                         "has check condition: aborted command: "
1043                                         "ASC: 0x%x, ASCQ: 0x%x\n",
1044                                         cp, asc, ascq);
1045                                 cmd->result = DID_SOFT_ERROR << 16;
1046                                 break;
1047                         }
1048                         /* Must be some other type of check condition */
1049                         dev_warn(&h->pdev->dev, "cp %p has check condition: "
1050                                         "unknown type: "
1051                                         "Sense: 0x%x, ASC: 0x%x, ASCQ: 0x%x, "
1052                                         "Returning result: 0x%x, "
1053                                         "cmd=[%02x %02x %02x %02x %02x "
1054                                         "%02x %02x %02x %02x %02x %02x "
1055                                         "%02x %02x %02x %02x %02x]\n",
1056                                         cp, sense_key, asc, ascq,
1057                                         cmd->result,
1058                                         cmd->cmnd[0], cmd->cmnd[1],
1059                                         cmd->cmnd[2], cmd->cmnd[3],
1060                                         cmd->cmnd[4], cmd->cmnd[5],
1061                                         cmd->cmnd[6], cmd->cmnd[7],
1062                                         cmd->cmnd[8], cmd->cmnd[9],
1063                                         cmd->cmnd[10], cmd->cmnd[11],
1064                                         cmd->cmnd[12], cmd->cmnd[13],
1065                                         cmd->cmnd[14], cmd->cmnd[15]);
1066                         break;
1067                 }
1068
1069
1070                 /* Problem was not a check condition
1071                  * Pass it up to the upper layers...
1072                  */
1073                 if (ei->ScsiStatus) {
1074                         dev_warn(&h->pdev->dev, "cp %p has status 0x%x "
1075                                 "Sense: 0x%x, ASC: 0x%x, ASCQ: 0x%x, "
1076                                 "Returning result: 0x%x\n",
1077                                 cp, ei->ScsiStatus,
1078                                 sense_key, asc, ascq,
1079                                 cmd->result);
1080                 } else {  /* scsi status is zero??? How??? */
1081                         dev_warn(&h->pdev->dev, "cp %p SCSI status was 0. "
1082                                 "Returning no connection.\n", cp),
1083
1084                         /* Ordinarily, this case should never happen,
1085                          * but there is a bug in some released firmware
1086                          * revisions that allows it to happen if, for
1087                          * example, a 4100 backplane loses power and
1088                          * the tape drive is in it.  We assume that
1089                          * it's a fatal error of some kind because we
1090                          * can't show that it wasn't. We will make it
1091                          * look like selection timeout since that is
1092                          * the most common reason for this to occur,
1093                          * and it's severe enough.
1094                          */
1095
1096                         cmd->result = DID_NO_CONNECT << 16;
1097                 }
1098                 break;
1099
1100         case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
1101                 break;
1102         case CMD_DATA_OVERRUN:
1103                 dev_warn(&h->pdev->dev, "cp %p has"
1104                         " completed with data overrun "
1105                         "reported\n", cp);
1106                 break;
1107         case CMD_INVALID: {
1108                 /* print_bytes(cp, sizeof(*cp), 1, 0);
1109                 print_cmd(cp); */
1110                 /* We get CMD_INVALID if you address a non-existent device
1111                  * instead of a selection timeout (no response).  You will
1112                  * see this if you yank out a drive, then try to access it.
1113                  * This is kind of a shame because it means that any other
1114                  * CMD_INVALID (e.g. driver bug) will get interpreted as a
1115                  * missing target. */
1116                 cmd->result = DID_NO_CONNECT << 16;
1117         }
1118                 break;
1119         case CMD_PROTOCOL_ERR:
1120                 dev_warn(&h->pdev->dev, "cp %p has "
1121                         "protocol error \n", cp);
1122                 break;
1123         case CMD_HARDWARE_ERR:
1124                 cmd->result = DID_ERROR << 16;
1125                 dev_warn(&h->pdev->dev, "cp %p had  hardware error\n", cp);
1126                 break;
1127         case CMD_CONNECTION_LOST:
1128                 cmd->result = DID_ERROR << 16;
1129                 dev_warn(&h->pdev->dev, "cp %p had connection lost\n", cp);
1130                 break;
1131         case CMD_ABORTED:
1132                 cmd->result = DID_ABORT << 16;
1133                 dev_warn(&h->pdev->dev, "cp %p was aborted with status 0x%x\n",
1134                                 cp, ei->ScsiStatus);
1135                 break;
1136         case CMD_ABORT_FAILED:
1137                 cmd->result = DID_ERROR << 16;
1138                 dev_warn(&h->pdev->dev, "cp %p reports abort failed\n", cp);
1139                 break;
1140         case CMD_UNSOLICITED_ABORT:
1141                 cmd->result = DID_RESET << 16;
1142                 dev_warn(&h->pdev->dev, "cp %p aborted do to an unsolicited "
1143                         "abort\n", cp);
1144                 break;
1145         case CMD_TIMEOUT:
1146                 cmd->result = DID_TIME_OUT << 16;
1147                 dev_warn(&h->pdev->dev, "cp %p timedout\n", cp);
1148                 break;
1149         default:
1150                 cmd->result = DID_ERROR << 16;
1151                 dev_warn(&h->pdev->dev, "cp %p returned unknown status %x\n",
1152                                 cp, ei->CommandStatus);
1153         }
1154         cmd->scsi_done(cmd);
1155         cmd_free(h, cp);
1156 }
1157
1158 static int hpsa_scsi_detect(struct ctlr_info *h)
1159 {
1160         struct Scsi_Host *sh;
1161         int error;
1162
1163         sh = scsi_host_alloc(&hpsa_driver_template, sizeof(h));
1164         if (sh == NULL)
1165                 goto fail;
1166
1167         sh->io_port = 0;
1168         sh->n_io_port = 0;
1169         sh->this_id = -1;
1170         sh->max_channel = 3;
1171         sh->max_cmd_len = MAX_COMMAND_SIZE;
1172         sh->max_lun = HPSA_MAX_LUN;
1173         sh->max_id = HPSA_MAX_LUN;
1174         sh->can_queue = h->nr_cmds;
1175         sh->cmd_per_lun = h->nr_cmds;
1176         sh->sg_tablesize = h->maxsgentries;
1177         h->scsi_host = sh;
1178         sh->hostdata[0] = (unsigned long) h;
1179         sh->irq = h->intr[PERF_MODE_INT];
1180         sh->unique_id = sh->irq;
1181         error = scsi_add_host(sh, &h->pdev->dev);
1182         if (error)
1183                 goto fail_host_put;
1184         scsi_scan_host(sh);
1185         return 0;
1186
1187  fail_host_put:
1188         dev_err(&h->pdev->dev, "hpsa_scsi_detect: scsi_add_host"
1189                 " failed for controller %d\n", h->ctlr);
1190         scsi_host_put(sh);
1191         return error;
1192  fail:
1193         dev_err(&h->pdev->dev, "hpsa_scsi_detect: scsi_host_alloc"
1194                 " failed for controller %d\n", h->ctlr);
1195         return -ENOMEM;
1196 }
1197
1198 static void hpsa_pci_unmap(struct pci_dev *pdev,
1199         struct CommandList *c, int sg_used, int data_direction)
1200 {
1201         int i;
1202         union u64bit addr64;
1203
1204         for (i = 0; i < sg_used; i++) {
1205                 addr64.val32.lower = c->SG[i].Addr.lower;
1206                 addr64.val32.upper = c->SG[i].Addr.upper;
1207                 pci_unmap_single(pdev, (dma_addr_t) addr64.val, c->SG[i].Len,
1208                         data_direction);
1209         }
1210 }
1211
1212 static void hpsa_map_one(struct pci_dev *pdev,
1213                 struct CommandList *cp,
1214                 unsigned char *buf,
1215                 size_t buflen,
1216                 int data_direction)
1217 {
1218         u64 addr64;
1219
1220         if (buflen == 0 || data_direction == PCI_DMA_NONE) {
1221                 cp->Header.SGList = 0;
1222                 cp->Header.SGTotal = 0;
1223                 return;
1224         }
1225
1226         addr64 = (u64) pci_map_single(pdev, buf, buflen, data_direction);
1227         cp->SG[0].Addr.lower =
1228           (u32) (addr64 & (u64) 0x00000000FFFFFFFF);
1229         cp->SG[0].Addr.upper =
1230           (u32) ((addr64 >> 32) & (u64) 0x00000000FFFFFFFF);
1231         cp->SG[0].Len = buflen;
1232         cp->Header.SGList = (u8) 1;   /* no. SGs contig in this cmd */
1233         cp->Header.SGTotal = (u16) 1; /* total sgs in this cmd list */
1234 }
1235
1236 static inline void hpsa_scsi_do_simple_cmd_core(struct ctlr_info *h,
1237         struct CommandList *c)
1238 {
1239         DECLARE_COMPLETION_ONSTACK(wait);
1240
1241         c->waiting = &wait;
1242         enqueue_cmd_and_start_io(h, c);
1243         wait_for_completion(&wait);
1244 }
1245
1246 static void hpsa_scsi_do_simple_cmd_with_retry(struct ctlr_info *h,
1247         struct CommandList *c, int data_direction)
1248 {
1249         int retry_count = 0;
1250
1251         do {
1252                 memset(c->err_info, 0, sizeof(c->err_info));
1253                 hpsa_scsi_do_simple_cmd_core(h, c);
1254                 retry_count++;
1255         } while (check_for_unit_attention(h, c) && retry_count <= 3);
1256         hpsa_pci_unmap(h->pdev, c, 1, data_direction);
1257 }
1258
1259 static void hpsa_scsi_interpret_error(struct CommandList *cp)
1260 {
1261         struct ErrorInfo *ei;
1262         struct device *d = &cp->h->pdev->dev;
1263
1264         ei = cp->err_info;
1265         switch (ei->CommandStatus) {
1266         case CMD_TARGET_STATUS:
1267                 dev_warn(d, "cmd %p has completed with errors\n", cp);
1268                 dev_warn(d, "cmd %p has SCSI Status = %x\n", cp,
1269                                 ei->ScsiStatus);
1270                 if (ei->ScsiStatus == 0)
1271                         dev_warn(d, "SCSI status is abnormally zero.  "
1272                         "(probably indicates selection timeout "
1273                         "reported incorrectly due to a known "
1274                         "firmware bug, circa July, 2001.)\n");
1275                 break;
1276         case CMD_DATA_UNDERRUN: /* let mid layer handle it. */
1277                         dev_info(d, "UNDERRUN\n");
1278                 break;
1279         case CMD_DATA_OVERRUN:
1280                 dev_warn(d, "cp %p has completed with data overrun\n", cp);
1281                 break;
1282         case CMD_INVALID: {
1283                 /* controller unfortunately reports SCSI passthru's
1284                  * to non-existent targets as invalid commands.
1285                  */
1286                 dev_warn(d, "cp %p is reported invalid (probably means "
1287                         "target device no longer present)\n", cp);
1288                 /* print_bytes((unsigned char *) cp, sizeof(*cp), 1, 0);
1289                 print_cmd(cp);  */
1290                 }
1291                 break;
1292         case CMD_PROTOCOL_ERR:
1293                 dev_warn(d, "cp %p has protocol error \n", cp);
1294                 break;
1295         case CMD_HARDWARE_ERR:
1296                 /* cmd->result = DID_ERROR << 16; */
1297                 dev_warn(d, "cp %p had hardware error\n", cp);
1298                 break;
1299         case CMD_CONNECTION_LOST:
1300                 dev_warn(d, "cp %p had connection lost\n", cp);
1301                 break;
1302         case CMD_ABORTED:
1303                 dev_warn(d, "cp %p was aborted\n", cp);
1304                 break;
1305         case CMD_ABORT_FAILED:
1306                 dev_warn(d, "cp %p reports abort failed\n", cp);
1307                 break;
1308         case CMD_UNSOLICITED_ABORT:
1309                 dev_warn(d, "cp %p aborted due to an unsolicited abort\n", cp);
1310                 break;
1311         case CMD_TIMEOUT:
1312                 dev_warn(d, "cp %p timed out\n", cp);
1313                 break;
1314         default:
1315                 dev_warn(d, "cp %p returned unknown status %x\n", cp,
1316                                 ei->CommandStatus);
1317         }
1318 }
1319
1320 static int hpsa_scsi_do_inquiry(struct ctlr_info *h, unsigned char *scsi3addr,
1321                         unsigned char page, unsigned char *buf,
1322                         unsigned char bufsize)
1323 {
1324         int rc = IO_OK;
1325         struct CommandList *c;
1326         struct ErrorInfo *ei;
1327
1328         c = cmd_special_alloc(h);
1329
1330         if (c == NULL) {                        /* trouble... */
1331                 dev_warn(&h->pdev->dev, "cmd_special_alloc returned NULL!\n");
1332                 return -ENOMEM;
1333         }
1334
1335         fill_cmd(c, HPSA_INQUIRY, h, buf, bufsize, page, scsi3addr, TYPE_CMD);
1336         hpsa_scsi_do_simple_cmd_with_retry(h, c, PCI_DMA_FROMDEVICE);
1337         ei = c->err_info;
1338         if (ei->CommandStatus != 0 && ei->CommandStatus != CMD_DATA_UNDERRUN) {
1339                 hpsa_scsi_interpret_error(c);
1340                 rc = -1;
1341         }
1342         cmd_special_free(h, c);
1343         return rc;
1344 }
1345
1346 static int hpsa_send_reset(struct ctlr_info *h, unsigned char *scsi3addr)
1347 {
1348         int rc = IO_OK;
1349         struct CommandList *c;
1350         struct ErrorInfo *ei;
1351
1352         c = cmd_special_alloc(h);
1353
1354         if (c == NULL) {                        /* trouble... */
1355                 dev_warn(&h->pdev->dev, "cmd_special_alloc returned NULL!\n");
1356                 return -ENOMEM;
1357         }
1358
1359         fill_cmd(c, HPSA_DEVICE_RESET_MSG, h, NULL, 0, 0, scsi3addr, TYPE_MSG);
1360         hpsa_scsi_do_simple_cmd_core(h, c);
1361         /* no unmap needed here because no data xfer. */
1362
1363         ei = c->err_info;
1364         if (ei->CommandStatus != 0) {
1365                 hpsa_scsi_interpret_error(c);
1366                 rc = -1;
1367         }
1368         cmd_special_free(h, c);
1369         return rc;
1370 }
1371
1372 static void hpsa_get_raid_level(struct ctlr_info *h,
1373         unsigned char *scsi3addr, unsigned char *raid_level)
1374 {
1375         int rc;
1376         unsigned char *buf;
1377
1378         *raid_level = RAID_UNKNOWN;
1379         buf = kzalloc(64, GFP_KERNEL);
1380         if (!buf)
1381                 return;
1382         rc = hpsa_scsi_do_inquiry(h, scsi3addr, 0xC1, buf, 64);
1383         if (rc == 0)
1384                 *raid_level = buf[8];
1385         if (*raid_level > RAID_UNKNOWN)
1386                 *raid_level = RAID_UNKNOWN;
1387         kfree(buf);
1388         return;
1389 }
1390
1391 /* Get the device id from inquiry page 0x83 */
1392 static int hpsa_get_device_id(struct ctlr_info *h, unsigned char *scsi3addr,
1393         unsigned char *device_id, int buflen)
1394 {
1395         int rc;
1396         unsigned char *buf;
1397
1398         if (buflen > 16)
1399                 buflen = 16;
1400         buf = kzalloc(64, GFP_KERNEL);
1401         if (!buf)
1402                 return -1;
1403         rc = hpsa_scsi_do_inquiry(h, scsi3addr, 0x83, buf, 64);
1404         if (rc == 0)
1405                 memcpy(device_id, &buf[8], buflen);
1406         kfree(buf);
1407         return rc != 0;
1408 }
1409
1410 static int hpsa_scsi_do_report_luns(struct ctlr_info *h, int logical,
1411                 struct ReportLUNdata *buf, int bufsize,
1412                 int extended_response)
1413 {
1414         int rc = IO_OK;
1415         struct CommandList *c;
1416         unsigned char scsi3addr[8];
1417         struct ErrorInfo *ei;
1418
1419         c = cmd_special_alloc(h);
1420         if (c == NULL) {                        /* trouble... */
1421                 dev_err(&h->pdev->dev, "cmd_special_alloc returned NULL!\n");
1422                 return -1;
1423         }
1424         /* address the controller */
1425         memset(scsi3addr, 0, sizeof(scsi3addr));
1426         fill_cmd(c, logical ? HPSA_REPORT_LOG : HPSA_REPORT_PHYS, h,
1427                 buf, bufsize, 0, scsi3addr, TYPE_CMD);
1428         if (extended_response)
1429                 c->Request.CDB[1] = extended_response;
1430         hpsa_scsi_do_simple_cmd_with_retry(h, c, PCI_DMA_FROMDEVICE);
1431         ei = c->err_info;
1432         if (ei->CommandStatus != 0 &&
1433             ei->CommandStatus != CMD_DATA_UNDERRUN) {
1434                 hpsa_scsi_interpret_error(c);
1435                 rc = -1;
1436         }
1437         cmd_special_free(h, c);
1438         return rc;
1439 }
1440
1441 static inline int hpsa_scsi_do_report_phys_luns(struct ctlr_info *h,
1442                 struct ReportLUNdata *buf,
1443                 int bufsize, int extended_response)
1444 {
1445         return hpsa_scsi_do_report_luns(h, 0, buf, bufsize, extended_response);
1446 }
1447
1448 static inline int hpsa_scsi_do_report_log_luns(struct ctlr_info *h,
1449                 struct ReportLUNdata *buf, int bufsize)
1450 {
1451         return hpsa_scsi_do_report_luns(h, 1, buf, bufsize, 0);
1452 }
1453
1454 static inline void hpsa_set_bus_target_lun(struct hpsa_scsi_dev_t *device,
1455         int bus, int target, int lun)
1456 {
1457         device->bus = bus;
1458         device->target = target;
1459         device->lun = lun;
1460 }
1461
1462 static int hpsa_update_device_info(struct ctlr_info *h,
1463         unsigned char scsi3addr[], struct hpsa_scsi_dev_t *this_device)
1464 {
1465 #define OBDR_TAPE_INQ_SIZE 49
1466         unsigned char *inq_buff;
1467
1468         inq_buff = kzalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL);
1469         if (!inq_buff)
1470                 goto bail_out;
1471
1472         /* Do an inquiry to the device to see what it is. */
1473         if (hpsa_scsi_do_inquiry(h, scsi3addr, 0, inq_buff,
1474                 (unsigned char) OBDR_TAPE_INQ_SIZE) != 0) {
1475                 /* Inquiry failed (msg printed already) */
1476                 dev_err(&h->pdev->dev,
1477                         "hpsa_update_device_info: inquiry failed\n");
1478                 goto bail_out;
1479         }
1480
1481         this_device->devtype = (inq_buff[0] & 0x1f);
1482         memcpy(this_device->scsi3addr, scsi3addr, 8);
1483         memcpy(this_device->vendor, &inq_buff[8],
1484                 sizeof(this_device->vendor));
1485         memcpy(this_device->model, &inq_buff[16],
1486                 sizeof(this_device->model));
1487         memcpy(this_device->revision, &inq_buff[32],
1488                 sizeof(this_device->revision));
1489         memset(this_device->device_id, 0,
1490                 sizeof(this_device->device_id));
1491         hpsa_get_device_id(h, scsi3addr, this_device->device_id,
1492                 sizeof(this_device->device_id));
1493
1494         if (this_device->devtype == TYPE_DISK &&
1495                 is_logical_dev_addr_mode(scsi3addr))
1496                 hpsa_get_raid_level(h, scsi3addr, &this_device->raid_level);
1497         else
1498                 this_device->raid_level = RAID_UNKNOWN;
1499
1500         kfree(inq_buff);
1501         return 0;
1502
1503 bail_out:
1504         kfree(inq_buff);
1505         return 1;
1506 }
1507
1508 static unsigned char *msa2xxx_model[] = {
1509         "MSA2012",
1510         "MSA2024",
1511         "MSA2312",
1512         "MSA2324",
1513         NULL,
1514 };
1515
1516 static int is_msa2xxx(struct ctlr_info *h, struct hpsa_scsi_dev_t *device)
1517 {
1518         int i;
1519
1520         for (i = 0; msa2xxx_model[i]; i++)
1521                 if (strncmp(device->model, msa2xxx_model[i],
1522                         strlen(msa2xxx_model[i])) == 0)
1523                         return 1;
1524         return 0;
1525 }
1526
1527 /* Helper function to assign bus, target, lun mapping of devices.
1528  * Puts non-msa2xxx logical volumes on bus 0, msa2xxx logical
1529  * volumes on bus 1, physical devices on bus 2. and the hba on bus 3.
1530  * Logical drive target and lun are assigned at this time, but
1531  * physical device lun and target assignment are deferred (assigned
1532  * in hpsa_find_target_lun, called by hpsa_scsi_add_entry.)
1533  */
1534 static void figure_bus_target_lun(struct ctlr_info *h,
1535         u8 *lunaddrbytes, int *bus, int *target, int *lun,
1536         struct hpsa_scsi_dev_t *device)
1537 {
1538         u32 lunid;
1539
1540         if (is_logical_dev_addr_mode(lunaddrbytes)) {
1541                 /* logical device */
1542                 if (unlikely(is_scsi_rev_5(h))) {
1543                         /* p1210m, logical drives lun assignments
1544                          * match SCSI REPORT LUNS data.
1545                          */
1546                         lunid = le32_to_cpu(*((__le32 *) lunaddrbytes));
1547                         *bus = 0;
1548                         *target = 0;
1549                         *lun = (lunid & 0x3fff) + 1;
1550                 } else {
1551                         /* not p1210m... */
1552                         lunid = le32_to_cpu(*((__le32 *) lunaddrbytes));
1553                         if (is_msa2xxx(h, device)) {
1554                                 /* msa2xxx way, put logicals on bus 1
1555                                  * and match target/lun numbers box
1556                                  * reports.
1557                                  */
1558                                 *bus = 1;
1559                                 *target = (lunid >> 16) & 0x3fff;
1560                                 *lun = lunid & 0x00ff;
1561                         } else {
1562                                 /* Traditional smart array way. */
1563                                 *bus = 0;
1564                                 *lun = 0;
1565                                 *target = lunid & 0x3fff;
1566                         }
1567                 }
1568         } else {
1569                 /* physical device */
1570                 if (is_hba_lunid(lunaddrbytes))
1571                         if (unlikely(is_scsi_rev_5(h))) {
1572                                 *bus = 0; /* put p1210m ctlr at 0,0,0 */
1573                                 *target = 0;
1574                                 *lun = 0;
1575                                 return;
1576                         } else
1577                                 *bus = 3; /* traditional smartarray */
1578                 else
1579                         *bus = 2; /* physical disk */
1580                 *target = -1;
1581                 *lun = -1; /* we will fill these in later. */
1582         }
1583 }
1584
1585 /*
1586  * If there is no lun 0 on a target, linux won't find any devices.
1587  * For the MSA2xxx boxes, we have to manually detect the enclosure
1588  * which is at lun zero, as CCISS_REPORT_PHYSICAL_LUNS doesn't report
1589  * it for some reason.  *tmpdevice is the target we're adding,
1590  * this_device is a pointer into the current element of currentsd[]
1591  * that we're building up in update_scsi_devices(), below.
1592  * lunzerobits is a bitmap that tracks which targets already have a
1593  * lun 0 assigned.
1594  * Returns 1 if an enclosure was added, 0 if not.
1595  */
1596 static int add_msa2xxx_enclosure_device(struct ctlr_info *h,
1597         struct hpsa_scsi_dev_t *tmpdevice,
1598         struct hpsa_scsi_dev_t *this_device, u8 *lunaddrbytes,
1599         int bus, int target, int lun, unsigned long lunzerobits[],
1600         int *nmsa2xxx_enclosures)
1601 {
1602         unsigned char scsi3addr[8];
1603
1604         if (test_bit(target, lunzerobits))
1605                 return 0; /* There is already a lun 0 on this target. */
1606
1607         if (!is_logical_dev_addr_mode(lunaddrbytes))
1608                 return 0; /* It's the logical targets that may lack lun 0. */
1609
1610         if (!is_msa2xxx(h, tmpdevice))
1611                 return 0; /* It's only the MSA2xxx that have this problem. */
1612
1613         if (lun == 0) /* if lun is 0, then obviously we have a lun 0. */
1614                 return 0;
1615
1616         if (is_hba_lunid(scsi3addr))
1617                 return 0; /* Don't add the RAID controller here. */
1618
1619         if (is_scsi_rev_5(h))
1620                 return 0; /* p1210m doesn't need to do this. */
1621
1622 #define MAX_MSA2XXX_ENCLOSURES 32
1623         if (*nmsa2xxx_enclosures >= MAX_MSA2XXX_ENCLOSURES) {
1624                 dev_warn(&h->pdev->dev, "Maximum number of MSA2XXX "
1625                         "enclosures exceeded.  Check your hardware "
1626                         "configuration.");
1627                 return 0;
1628         }
1629
1630         memset(scsi3addr, 0, 8);
1631         scsi3addr[3] = target;
1632         if (hpsa_update_device_info(h, scsi3addr, this_device))
1633                 return 0;
1634         (*nmsa2xxx_enclosures)++;
1635         hpsa_set_bus_target_lun(this_device, bus, target, 0);
1636         set_bit(target, lunzerobits);
1637         return 1;
1638 }
1639
1640 /*
1641  * Do CISS_REPORT_PHYS and CISS_REPORT_LOG.  Data is returned in physdev,
1642  * logdev.  The number of luns in physdev and logdev are returned in
1643  * *nphysicals and *nlogicals, respectively.
1644  * Returns 0 on success, -1 otherwise.
1645  */
1646 static int hpsa_gather_lun_info(struct ctlr_info *h,
1647         int reportlunsize,
1648         struct ReportLUNdata *physdev, u32 *nphysicals,
1649         struct ReportLUNdata *logdev, u32 *nlogicals)
1650 {
1651         if (hpsa_scsi_do_report_phys_luns(h, physdev, reportlunsize, 0)) {
1652                 dev_err(&h->pdev->dev, "report physical LUNs failed.\n");
1653                 return -1;
1654         }
1655         *nphysicals = be32_to_cpu(*((__be32 *)physdev->LUNListLength)) / 8;
1656         if (*nphysicals > HPSA_MAX_PHYS_LUN) {
1657                 dev_warn(&h->pdev->dev, "maximum physical LUNs (%d) exceeded."
1658                         "  %d LUNs ignored.\n", HPSA_MAX_PHYS_LUN,
1659                         *nphysicals - HPSA_MAX_PHYS_LUN);
1660                 *nphysicals = HPSA_MAX_PHYS_LUN;
1661         }
1662         if (hpsa_scsi_do_report_log_luns(h, logdev, reportlunsize)) {
1663                 dev_err(&h->pdev->dev, "report logical LUNs failed.\n");
1664                 return -1;
1665         }
1666         *nlogicals = be32_to_cpu(*((__be32 *) logdev->LUNListLength)) / 8;
1667         /* Reject Logicals in excess of our max capability. */
1668         if (*nlogicals > HPSA_MAX_LUN) {
1669                 dev_warn(&h->pdev->dev,
1670                         "maximum logical LUNs (%d) exceeded.  "
1671                         "%d LUNs ignored.\n", HPSA_MAX_LUN,
1672                         *nlogicals - HPSA_MAX_LUN);
1673                         *nlogicals = HPSA_MAX_LUN;
1674         }
1675         if (*nlogicals + *nphysicals > HPSA_MAX_PHYS_LUN) {
1676                 dev_warn(&h->pdev->dev,
1677                         "maximum logical + physical LUNs (%d) exceeded. "
1678                         "%d LUNs ignored.\n", HPSA_MAX_PHYS_LUN,
1679                         *nphysicals + *nlogicals - HPSA_MAX_PHYS_LUN);
1680                 *nlogicals = HPSA_MAX_PHYS_LUN - *nphysicals;
1681         }
1682         return 0;
1683 }
1684
1685 u8 *figure_lunaddrbytes(struct ctlr_info *h, int raid_ctlr_position, int i,
1686         int nphysicals, int nlogicals, struct ReportLUNdata *physdev_list,
1687         struct ReportLUNdata *logdev_list)
1688 {
1689         /* Helper function, figure out where the LUN ID info is coming from
1690          * given index i, lists of physical and logical devices, where in
1691          * the list the raid controller is supposed to appear (first or last)
1692          */
1693
1694         int logicals_start = nphysicals + (raid_ctlr_position == 0);
1695         int last_device = nphysicals + nlogicals + (raid_ctlr_position == 0);
1696
1697         if (i == raid_ctlr_position)
1698                 return RAID_CTLR_LUNID;
1699
1700         if (i < logicals_start)
1701                 return &physdev_list->LUN[i - (raid_ctlr_position == 0)][0];
1702
1703         if (i < last_device)
1704                 return &logdev_list->LUN[i - nphysicals -
1705                         (raid_ctlr_position == 0)][0];
1706         BUG();
1707         return NULL;
1708 }
1709
1710 static void hpsa_update_scsi_devices(struct ctlr_info *h, int hostno)
1711 {
1712         /* the idea here is we could get notified
1713          * that some devices have changed, so we do a report
1714          * physical luns and report logical luns cmd, and adjust
1715          * our list of devices accordingly.
1716          *
1717          * The scsi3addr's of devices won't change so long as the
1718          * adapter is not reset.  That means we can rescan and
1719          * tell which devices we already know about, vs. new
1720          * devices, vs.  disappearing devices.
1721          */
1722         struct ReportLUNdata *physdev_list = NULL;
1723         struct ReportLUNdata *logdev_list = NULL;
1724         unsigned char *inq_buff = NULL;
1725         u32 nphysicals = 0;
1726         u32 nlogicals = 0;
1727         u32 ndev_allocated = 0;
1728         struct hpsa_scsi_dev_t **currentsd, *this_device, *tmpdevice;
1729         int ncurrent = 0;
1730         int reportlunsize = sizeof(*physdev_list) + HPSA_MAX_PHYS_LUN * 8;
1731         int i, nmsa2xxx_enclosures, ndevs_to_allocate;
1732         int bus, target, lun;
1733         int raid_ctlr_position;
1734         DECLARE_BITMAP(lunzerobits, HPSA_MAX_TARGETS_PER_CTLR);
1735
1736         currentsd = kzalloc(sizeof(*currentsd) * HPSA_MAX_SCSI_DEVS_PER_HBA,
1737                 GFP_KERNEL);
1738         physdev_list = kzalloc(reportlunsize, GFP_KERNEL);
1739         logdev_list = kzalloc(reportlunsize, GFP_KERNEL);
1740         inq_buff = kmalloc(OBDR_TAPE_INQ_SIZE, GFP_KERNEL);
1741         tmpdevice = kzalloc(sizeof(*tmpdevice), GFP_KERNEL);
1742
1743         if (!currentsd || !physdev_list || !logdev_list ||
1744                 !inq_buff || !tmpdevice) {
1745                 dev_err(&h->pdev->dev, "out of memory\n");
1746                 goto out;
1747         }
1748         memset(lunzerobits, 0, sizeof(lunzerobits));
1749
1750         if (hpsa_gather_lun_info(h, reportlunsize, physdev_list, &nphysicals,
1751                         logdev_list, &nlogicals))
1752                 goto out;
1753
1754         /* We might see up to 32 MSA2xxx enclosures, actually 8 of them
1755          * but each of them 4 times through different paths.  The plus 1
1756          * is for the RAID controller.
1757          */
1758         ndevs_to_allocate = nphysicals + nlogicals + MAX_MSA2XXX_ENCLOSURES + 1;
1759
1760         /* Allocate the per device structures */
1761         for (i = 0; i < ndevs_to_allocate; i++) {
1762                 currentsd[i] = kzalloc(sizeof(*currentsd[i]), GFP_KERNEL);
1763                 if (!currentsd[i]) {
1764                         dev_warn(&h->pdev->dev, "out of memory at %s:%d\n",
1765                                 __FILE__, __LINE__);
1766                         goto out;
1767                 }
1768                 ndev_allocated++;
1769         }
1770
1771         if (unlikely(is_scsi_rev_5(h)))
1772                 raid_ctlr_position = 0;
1773         else
1774                 raid_ctlr_position = nphysicals + nlogicals;
1775
1776         /* adjust our table of devices */
1777         nmsa2xxx_enclosures = 0;
1778         for (i = 0; i < nphysicals + nlogicals + 1; i++) {
1779                 u8 *lunaddrbytes;
1780
1781                 /* Figure out where the LUN ID info is coming from */
1782                 lunaddrbytes = figure_lunaddrbytes(h, raid_ctlr_position,
1783                         i, nphysicals, nlogicals, physdev_list, logdev_list);
1784                 /* skip masked physical devices. */
1785                 if (lunaddrbytes[3] & 0xC0 &&
1786                         i < nphysicals + (raid_ctlr_position == 0))
1787                         continue;
1788
1789                 /* Get device type, vendor, model, device id */
1790                 if (hpsa_update_device_info(h, lunaddrbytes, tmpdevice))
1791                         continue; /* skip it if we can't talk to it. */
1792                 figure_bus_target_lun(h, lunaddrbytes, &bus, &target, &lun,
1793                         tmpdevice);
1794                 this_device = currentsd[ncurrent];
1795
1796                 /*
1797                  * For the msa2xxx boxes, we have to insert a LUN 0 which
1798                  * doesn't show up in CCISS_REPORT_PHYSICAL data, but there
1799                  * is nonetheless an enclosure device there.  We have to
1800                  * present that otherwise linux won't find anything if
1801                  * there is no lun 0.
1802                  */
1803                 if (add_msa2xxx_enclosure_device(h, tmpdevice, this_device,
1804                                 lunaddrbytes, bus, target, lun, lunzerobits,
1805                                 &nmsa2xxx_enclosures)) {
1806                         ncurrent++;
1807                         this_device = currentsd[ncurrent];
1808                 }
1809
1810                 *this_device = *tmpdevice;
1811                 hpsa_set_bus_target_lun(this_device, bus, target, lun);
1812
1813                 switch (this_device->devtype) {
1814                 case TYPE_ROM: {
1815                         /* We don't *really* support actual CD-ROM devices,
1816                          * just "One Button Disaster Recovery" tape drive
1817                          * which temporarily pretends to be a CD-ROM drive.
1818                          * So we check that the device is really an OBDR tape
1819                          * device by checking for "$DR-10" in bytes 43-48 of
1820                          * the inquiry data.
1821                          */
1822                                 char obdr_sig[7];
1823 #define OBDR_TAPE_SIG "$DR-10"
1824                                 strncpy(obdr_sig, &inq_buff[43], 6);
1825                                 obdr_sig[6] = '\0';
1826                                 if (strncmp(obdr_sig, OBDR_TAPE_SIG, 6) != 0)
1827                                         /* Not OBDR device, ignore it. */
1828                                         break;
1829                         }
1830                         ncurrent++;
1831                         break;
1832                 case TYPE_DISK:
1833                         if (i < nphysicals)
1834                                 break;
1835                         ncurrent++;
1836                         break;
1837                 case TYPE_TAPE:
1838                 case TYPE_MEDIUM_CHANGER:
1839                         ncurrent++;
1840                         break;
1841                 case TYPE_RAID:
1842                         /* Only present the Smartarray HBA as a RAID controller.
1843                          * If it's a RAID controller other than the HBA itself
1844                          * (an external RAID controller, MSA500 or similar)
1845                          * don't present it.
1846                          */
1847                         if (!is_hba_lunid(lunaddrbytes))
1848                                 break;
1849                         ncurrent++;
1850                         break;
1851                 default:
1852                         break;
1853                 }
1854                 if (ncurrent >= HPSA_MAX_SCSI_DEVS_PER_HBA)
1855                         break;
1856         }
1857         adjust_hpsa_scsi_table(h, hostno, currentsd, ncurrent);
1858 out:
1859         kfree(tmpdevice);
1860         for (i = 0; i < ndev_allocated; i++)
1861                 kfree(currentsd[i]);
1862         kfree(currentsd);
1863         kfree(inq_buff);
1864         kfree(physdev_list);
1865         kfree(logdev_list);
1866 }
1867
1868 /* hpsa_scatter_gather takes a struct scsi_cmnd, (cmd), and does the pci
1869  * dma mapping  and fills in the scatter gather entries of the
1870  * hpsa command, cp.
1871  */
1872 static int hpsa_scatter_gather(struct ctlr_info *h,
1873                 struct CommandList *cp,
1874                 struct scsi_cmnd *cmd)
1875 {
1876         unsigned int len;
1877         struct scatterlist *sg;
1878         u64 addr64;
1879         int use_sg, i, sg_index, chained;
1880         struct SGDescriptor *curr_sg;
1881
1882         BUG_ON(scsi_sg_count(cmd) > h->maxsgentries);
1883
1884         use_sg = scsi_dma_map(cmd);
1885         if (use_sg < 0)
1886                 return use_sg;
1887
1888         if (!use_sg)
1889                 goto sglist_finished;
1890
1891         curr_sg = cp->SG;
1892         chained = 0;
1893         sg_index = 0;
1894         scsi_for_each_sg(cmd, sg, use_sg, i) {
1895                 if (i == h->max_cmd_sg_entries - 1 &&
1896                         use_sg > h->max_cmd_sg_entries) {
1897                         chained = 1;
1898                         curr_sg = h->cmd_sg_list[cp->cmdindex];
1899                         sg_index = 0;
1900                 }
1901                 addr64 = (u64) sg_dma_address(sg);
1902                 len  = sg_dma_len(sg);
1903                 curr_sg->Addr.lower = (u32) (addr64 & 0x0FFFFFFFFULL);
1904                 curr_sg->Addr.upper = (u32) ((addr64 >> 32) & 0x0FFFFFFFFULL);
1905                 curr_sg->Len = len;
1906                 curr_sg->Ext = 0;  /* we are not chaining */
1907                 curr_sg++;
1908         }
1909
1910         if (use_sg + chained > h->maxSG)
1911                 h->maxSG = use_sg + chained;
1912
1913         if (chained) {
1914                 cp->Header.SGList = h->max_cmd_sg_entries;
1915                 cp->Header.SGTotal = (u16) (use_sg + 1);
1916                 hpsa_map_sg_chain_block(h, cp);
1917                 return 0;
1918         }
1919
1920 sglist_finished:
1921
1922         cp->Header.SGList = (u8) use_sg;   /* no. SGs contig in this cmd */
1923         cp->Header.SGTotal = (u16) use_sg; /* total sgs in this cmd list */
1924         return 0;
1925 }
1926
1927
1928 static int hpsa_scsi_queue_command_lck(struct scsi_cmnd *cmd,
1929         void (*done)(struct scsi_cmnd *))
1930 {
1931         struct ctlr_info *h;
1932         struct hpsa_scsi_dev_t *dev;
1933         unsigned char scsi3addr[8];
1934         struct CommandList *c;
1935         unsigned long flags;
1936
1937         /* Get the ptr to our adapter structure out of cmd->host. */
1938         h = sdev_to_hba(cmd->device);
1939         dev = cmd->device->hostdata;
1940         if (!dev) {
1941                 cmd->result = DID_NO_CONNECT << 16;
1942                 done(cmd);
1943                 return 0;
1944         }
1945         memcpy(scsi3addr, dev->scsi3addr, sizeof(scsi3addr));
1946
1947         /* Need a lock as this is being allocated from the pool */
1948         spin_lock_irqsave(&h->lock, flags);
1949         c = cmd_alloc(h);
1950         spin_unlock_irqrestore(&h->lock, flags);
1951         if (c == NULL) {                        /* trouble... */
1952                 dev_err(&h->pdev->dev, "cmd_alloc returned NULL!\n");
1953                 return SCSI_MLQUEUE_HOST_BUSY;
1954         }
1955
1956         /* Fill in the command list header */
1957
1958         cmd->scsi_done = done;    /* save this for use by completion code */
1959
1960         /* save c in case we have to abort it  */
1961         cmd->host_scribble = (unsigned char *) c;
1962
1963         c->cmd_type = CMD_SCSI;
1964         c->scsi_cmd = cmd;
1965         c->Header.ReplyQueue = 0;  /* unused in simple mode */
1966         memcpy(&c->Header.LUN.LunAddrBytes[0], &scsi3addr[0], 8);
1967         c->Header.Tag.lower = (c->cmdindex << DIRECT_LOOKUP_SHIFT);
1968         c->Header.Tag.lower |= DIRECT_LOOKUP_BIT;
1969
1970         /* Fill in the request block... */
1971
1972         c->Request.Timeout = 0;
1973         memset(c->Request.CDB, 0, sizeof(c->Request.CDB));
1974         BUG_ON(cmd->cmd_len > sizeof(c->Request.CDB));
1975         c->Request.CDBLen = cmd->cmd_len;
1976         memcpy(c->Request.CDB, cmd->cmnd, cmd->cmd_len);
1977         c->Request.Type.Type = TYPE_CMD;
1978         c->Request.Type.Attribute = ATTR_SIMPLE;
1979         switch (cmd->sc_data_direction) {
1980         case DMA_TO_DEVICE:
1981                 c->Request.Type.Direction = XFER_WRITE;
1982                 break;
1983         case DMA_FROM_DEVICE:
1984                 c->Request.Type.Direction = XFER_READ;
1985                 break;
1986         case DMA_NONE:
1987                 c->Request.Type.Direction = XFER_NONE;
1988                 break;
1989         case DMA_BIDIRECTIONAL:
1990                 /* This can happen if a buggy application does a scsi passthru
1991                  * and sets both inlen and outlen to non-zero. ( see
1992                  * ../scsi/scsi_ioctl.c:scsi_ioctl_send_command() )
1993                  */
1994
1995                 c->Request.Type.Direction = XFER_RSVD;
1996                 /* This is technically wrong, and hpsa controllers should
1997                  * reject it with CMD_INVALID, which is the most correct
1998                  * response, but non-fibre backends appear to let it
1999                  * slide by, and give the same results as if this field
2000                  * were set correctly.  Either way is acceptable for
2001                  * our purposes here.
2002                  */
2003
2004                 break;
2005
2006         default:
2007                 dev_err(&h->pdev->dev, "unknown data direction: %d\n",
2008                         cmd->sc_data_direction);
2009                 BUG();
2010                 break;
2011         }
2012
2013         if (hpsa_scatter_gather(h, c, cmd) < 0) { /* Fill SG list */
2014                 cmd_free(h, c);
2015                 return SCSI_MLQUEUE_HOST_BUSY;
2016         }
2017         enqueue_cmd_and_start_io(h, c);
2018         /* the cmd'll come back via intr handler in complete_scsi_command()  */
2019         return 0;
2020 }
2021
2022 static DEF_SCSI_QCMD(hpsa_scsi_queue_command)
2023
2024 static void hpsa_scan_start(struct Scsi_Host *sh)
2025 {
2026         struct ctlr_info *h = shost_to_hba(sh);
2027         unsigned long flags;
2028
2029         /* wait until any scan already in progress is finished. */
2030         while (1) {
2031                 spin_lock_irqsave(&h->scan_lock, flags);
2032                 if (h->scan_finished)
2033                         break;
2034                 spin_unlock_irqrestore(&h->scan_lock, flags);
2035                 wait_event(h->scan_wait_queue, h->scan_finished);
2036                 /* Note: We don't need to worry about a race between this
2037                  * thread and driver unload because the midlayer will
2038                  * have incremented the reference count, so unload won't
2039                  * happen if we're in here.
2040                  */
2041         }
2042         h->scan_finished = 0; /* mark scan as in progress */
2043         spin_unlock_irqrestore(&h->scan_lock, flags);
2044
2045         hpsa_update_scsi_devices(h, h->scsi_host->host_no);
2046
2047         spin_lock_irqsave(&h->scan_lock, flags);
2048         h->scan_finished = 1; /* mark scan as finished. */
2049         wake_up_all(&h->scan_wait_queue);
2050         spin_unlock_irqrestore(&h->scan_lock, flags);
2051 }
2052
2053 static int hpsa_scan_finished(struct Scsi_Host *sh,
2054         unsigned long elapsed_time)
2055 {
2056         struct ctlr_info *h = shost_to_hba(sh);
2057         unsigned long flags;
2058         int finished;
2059
2060         spin_lock_irqsave(&h->scan_lock, flags);
2061         finished = h->scan_finished;
2062         spin_unlock_irqrestore(&h->scan_lock, flags);
2063         return finished;
2064 }
2065
2066 static int hpsa_change_queue_depth(struct scsi_device *sdev,
2067         int qdepth, int reason)
2068 {
2069         struct ctlr_info *h = sdev_to_hba(sdev);
2070
2071         if (reason != SCSI_QDEPTH_DEFAULT)
2072                 return -ENOTSUPP;
2073
2074         if (qdepth < 1)
2075                 qdepth = 1;
2076         else
2077                 if (qdepth > h->nr_cmds)
2078                         qdepth = h->nr_cmds;
2079         scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), qdepth);
2080         return sdev->queue_depth;
2081 }
2082
2083 static void hpsa_unregister_scsi(struct ctlr_info *h)
2084 {
2085         /* we are being forcibly unloaded, and may not refuse. */
2086         scsi_remove_host(h->scsi_host);
2087         scsi_host_put(h->scsi_host);
2088         h->scsi_host = NULL;
2089 }
2090
2091 static int hpsa_register_scsi(struct ctlr_info *h)
2092 {
2093         int rc;
2094
2095         rc = hpsa_scsi_detect(h);
2096         if (rc != 0)
2097                 dev_err(&h->pdev->dev, "hpsa_register_scsi: failed"
2098                         " hpsa_scsi_detect(), rc is %d\n", rc);
2099         return rc;
2100 }
2101
2102 static int wait_for_device_to_become_ready(struct ctlr_info *h,
2103         unsigned char lunaddr[])
2104 {
2105         int rc = 0;
2106         int count = 0;
2107         int waittime = 1; /* seconds */
2108         struct CommandList *c;
2109
2110         c = cmd_special_alloc(h);
2111         if (!c) {
2112                 dev_warn(&h->pdev->dev, "out of memory in "
2113                         "wait_for_device_to_become_ready.\n");
2114                 return IO_ERROR;
2115         }
2116
2117         /* Send test unit ready until device ready, or give up. */
2118         while (count < HPSA_TUR_RETRY_LIMIT) {
2119
2120                 /* Wait for a bit.  do this first, because if we send
2121                  * the TUR right away, the reset will just abort it.
2122                  */
2123                 msleep(1000 * waittime);
2124                 count++;
2125
2126                 /* Increase wait time with each try, up to a point. */
2127                 if (waittime < HPSA_MAX_WAIT_INTERVAL_SECS)
2128                         waittime = waittime * 2;
2129
2130                 /* Send the Test Unit Ready */
2131                 fill_cmd(c, TEST_UNIT_READY, h, NULL, 0, 0, lunaddr, TYPE_CMD);
2132                 hpsa_scsi_do_simple_cmd_core(h, c);
2133                 /* no unmap needed here because no data xfer. */
2134
2135                 if (c->err_info->CommandStatus == CMD_SUCCESS)
2136                         break;
2137
2138                 if (c->err_info->CommandStatus == CMD_TARGET_STATUS &&
2139                         c->err_info->ScsiStatus == SAM_STAT_CHECK_CONDITION &&
2140                         (c->err_info->SenseInfo[2] == NO_SENSE ||
2141                         c->err_info->SenseInfo[2] == UNIT_ATTENTION))
2142                         break;
2143
2144                 dev_warn(&h->pdev->dev, "waiting %d secs "
2145                         "for device to become ready.\n", waittime);
2146                 rc = 1; /* device not ready. */
2147         }
2148
2149         if (rc)
2150                 dev_warn(&h->pdev->dev, "giving up on device.\n");
2151         else
2152                 dev_warn(&h->pdev->dev, "device is ready.\n");
2153
2154         cmd_special_free(h, c);
2155         return rc;
2156 }
2157
2158 /* Need at least one of these error handlers to keep ../scsi/hosts.c from
2159  * complaining.  Doing a host- or bus-reset can't do anything good here.
2160  */
2161 static int hpsa_eh_device_reset_handler(struct scsi_cmnd *scsicmd)
2162 {
2163         int rc;
2164         struct ctlr_info *h;
2165         struct hpsa_scsi_dev_t *dev;
2166
2167         /* find the controller to which the command to be aborted was sent */
2168         h = sdev_to_hba(scsicmd->device);
2169         if (h == NULL) /* paranoia */
2170                 return FAILED;
2171         dev = scsicmd->device->hostdata;
2172         if (!dev) {
2173                 dev_err(&h->pdev->dev, "hpsa_eh_device_reset_handler: "
2174                         "device lookup failed.\n");
2175                 return FAILED;
2176         }
2177         dev_warn(&h->pdev->dev, "resetting device %d:%d:%d:%d\n",
2178                 h->scsi_host->host_no, dev->bus, dev->target, dev->lun);
2179         /* send a reset to the SCSI LUN which the command was sent to */
2180         rc = hpsa_send_reset(h, dev->scsi3addr);
2181         if (rc == 0 && wait_for_device_to_become_ready(h, dev->scsi3addr) == 0)
2182                 return SUCCESS;
2183
2184         dev_warn(&h->pdev->dev, "resetting device failed.\n");
2185         return FAILED;
2186 }
2187
2188 /*
2189  * For operations that cannot sleep, a command block is allocated at init,
2190  * and managed by cmd_alloc() and cmd_free() using a simple bitmap to track
2191  * which ones are free or in use.  Lock must be held when calling this.
2192  * cmd_free() is the complement.
2193  */
2194 static struct CommandList *cmd_alloc(struct ctlr_info *h)
2195 {
2196         struct CommandList *c;
2197         int i;
2198         union u64bit temp64;
2199         dma_addr_t cmd_dma_handle, err_dma_handle;
2200
2201         do {
2202                 i = find_first_zero_bit(h->cmd_pool_bits, h->nr_cmds);
2203                 if (i == h->nr_cmds)
2204                         return NULL;
2205         } while (test_and_set_bit
2206                  (i & (BITS_PER_LONG - 1),
2207                   h->cmd_pool_bits + (i / BITS_PER_LONG)) != 0);
2208         c = h->cmd_pool + i;
2209         memset(c, 0, sizeof(*c));
2210         cmd_dma_handle = h->cmd_pool_dhandle
2211             + i * sizeof(*c);
2212         c->err_info = h->errinfo_pool + i;
2213         memset(c->err_info, 0, sizeof(*c->err_info));
2214         err_dma_handle = h->errinfo_pool_dhandle
2215             + i * sizeof(*c->err_info);
2216         h->nr_allocs++;
2217
2218         c->cmdindex = i;
2219
2220         INIT_HLIST_NODE(&c->list);
2221         c->busaddr = (u32) cmd_dma_handle;
2222         temp64.val = (u64) err_dma_handle;
2223         c->ErrDesc.Addr.lower = temp64.val32.lower;
2224         c->ErrDesc.Addr.upper = temp64.val32.upper;
2225         c->ErrDesc.Len = sizeof(*c->err_info);
2226
2227         c->h = h;
2228         return c;
2229 }
2230
2231 /* For operations that can wait for kmalloc to possibly sleep,
2232  * this routine can be called. Lock need not be held to call
2233  * cmd_special_alloc. cmd_special_free() is the complement.
2234  */
2235 static struct CommandList *cmd_special_alloc(struct ctlr_info *h)
2236 {
2237         struct CommandList *c;
2238         union u64bit temp64;
2239         dma_addr_t cmd_dma_handle, err_dma_handle;
2240
2241         c = pci_alloc_consistent(h->pdev, sizeof(*c), &cmd_dma_handle);
2242         if (c == NULL)
2243                 return NULL;
2244         memset(c, 0, sizeof(*c));
2245
2246         c->cmdindex = -1;
2247
2248         c->err_info = pci_alloc_consistent(h->pdev, sizeof(*c->err_info),
2249                     &err_dma_handle);
2250
2251         if (c->err_info == NULL) {
2252                 pci_free_consistent(h->pdev,
2253                         sizeof(*c), c, cmd_dma_handle);
2254                 return NULL;
2255         }
2256         memset(c->err_info, 0, sizeof(*c->err_info));
2257
2258         INIT_HLIST_NODE(&c->list);
2259         c->busaddr = (u32) cmd_dma_handle;
2260         temp64.val = (u64) err_dma_handle;
2261         c->ErrDesc.Addr.lower = temp64.val32.lower;
2262         c->ErrDesc.Addr.upper = temp64.val32.upper;
2263         c->ErrDesc.Len = sizeof(*c->err_info);
2264
2265         c->h = h;
2266         return c;
2267 }
2268
2269 static void cmd_free(struct ctlr_info *h, struct CommandList *c)
2270 {
2271         int i;
2272
2273         i = c - h->cmd_pool;
2274         clear_bit(i & (BITS_PER_LONG - 1),
2275                   h->cmd_pool_bits + (i / BITS_PER_LONG));
2276         h->nr_frees++;
2277 }
2278
2279 static void cmd_special_free(struct ctlr_info *h, struct CommandList *c)
2280 {
2281         union u64bit temp64;
2282
2283         temp64.val32.lower = c->ErrDesc.Addr.lower;
2284         temp64.val32.upper = c->ErrDesc.Addr.upper;
2285         pci_free_consistent(h->pdev, sizeof(*c->err_info),
2286                             c->err_info, (dma_addr_t) temp64.val);
2287         pci_free_consistent(h->pdev, sizeof(*c),
2288                             c, (dma_addr_t) c->busaddr);
2289 }
2290
2291 #ifdef CONFIG_COMPAT
2292
2293 static int hpsa_ioctl32_passthru(struct scsi_device *dev, int cmd, void *arg)
2294 {
2295         IOCTL32_Command_struct __user *arg32 =
2296             (IOCTL32_Command_struct __user *) arg;
2297         IOCTL_Command_struct arg64;
2298         IOCTL_Command_struct __user *p = compat_alloc_user_space(sizeof(arg64));
2299         int err;
2300         u32 cp;
2301
2302         err = 0;
2303         err |= copy_from_user(&arg64.LUN_info, &arg32->LUN_info,
2304                            sizeof(arg64.LUN_info));
2305         err |= copy_from_user(&arg64.Request, &arg32->Request,
2306                            sizeof(arg64.Request));
2307         err |= copy_from_user(&arg64.error_info, &arg32->error_info,
2308                            sizeof(arg64.error_info));
2309         err |= get_user(arg64.buf_size, &arg32->buf_size);
2310         err |= get_user(cp, &arg32->buf);
2311         arg64.buf = compat_ptr(cp);
2312         err |= copy_to_user(p, &arg64, sizeof(arg64));
2313
2314         if (err)
2315                 return -EFAULT;
2316
2317         err = hpsa_ioctl(dev, CCISS_PASSTHRU, (void *)p);
2318         if (err)
2319                 return err;
2320         err |= copy_in_user(&arg32->error_info, &p->error_info,
2321                          sizeof(arg32->error_info));
2322         if (err)
2323                 return -EFAULT;
2324         return err;
2325 }
2326
2327 static int hpsa_ioctl32_big_passthru(struct scsi_device *dev,
2328         int cmd, void *arg)
2329 {
2330         BIG_IOCTL32_Command_struct __user *arg32 =
2331             (BIG_IOCTL32_Command_struct __user *) arg;
2332         BIG_IOCTL_Command_struct arg64;
2333         BIG_IOCTL_Command_struct __user *p =
2334             compat_alloc_user_space(sizeof(arg64));
2335         int err;
2336         u32 cp;
2337
2338         err = 0;
2339         err |= copy_from_user(&arg64.LUN_info, &arg32->LUN_info,
2340                            sizeof(arg64.LUN_info));
2341         err |= copy_from_user(&arg64.Request, &arg32->Request,
2342                            sizeof(arg64.Request));
2343         err |= copy_from_user(&arg64.error_info, &arg32->error_info,
2344                            sizeof(arg64.error_info));
2345         err |= get_user(arg64.buf_size, &arg32->buf_size);
2346         err |= get_user(arg64.malloc_size, &arg32->malloc_size);
2347         err |= get_user(cp, &arg32->buf);
2348         arg64.buf = compat_ptr(cp);
2349         err |= copy_to_user(p, &arg64, sizeof(arg64));
2350
2351         if (err)
2352                 return -EFAULT;
2353
2354         err = hpsa_ioctl(dev, CCISS_BIG_PASSTHRU, (void *)p);
2355         if (err)
2356                 return err;
2357         err |= copy_in_user(&arg32->error_info, &p->error_info,
2358                          sizeof(arg32->error_info));
2359         if (err)
2360                 return -EFAULT;
2361         return err;
2362 }
2363
2364 static int hpsa_compat_ioctl(struct scsi_device *dev, int cmd, void *arg)
2365 {
2366         switch (cmd) {
2367         case CCISS_GETPCIINFO:
2368         case CCISS_GETINTINFO:
2369         case CCISS_SETINTINFO:
2370         case CCISS_GETNODENAME:
2371         case CCISS_SETNODENAME:
2372         case CCISS_GETHEARTBEAT:
2373         case CCISS_GETBUSTYPES:
2374         case CCISS_GETFIRMVER:
2375         case CCISS_GETDRIVVER:
2376         case CCISS_REVALIDVOLS:
2377         case CCISS_DEREGDISK:
2378         case CCISS_REGNEWDISK:
2379         case CCISS_REGNEWD:
2380         case CCISS_RESCANDISK:
2381         case CCISS_GETLUNINFO:
2382                 return hpsa_ioctl(dev, cmd, arg);
2383
2384         case CCISS_PASSTHRU32:
2385                 return hpsa_ioctl32_passthru(dev, cmd, arg);
2386         case CCISS_BIG_PASSTHRU32:
2387                 return hpsa_ioctl32_big_passthru(dev, cmd, arg);
2388
2389         default:
2390                 return -ENOIOCTLCMD;
2391         }
2392 }
2393 #endif
2394
2395 static int hpsa_getpciinfo_ioctl(struct ctlr_info *h, void __user *argp)
2396 {
2397         struct hpsa_pci_info pciinfo;
2398
2399         if (!argp)
2400                 return -EINVAL;
2401         pciinfo.domain = pci_domain_nr(h->pdev->bus);
2402         pciinfo.bus = h->pdev->bus->number;
2403         pciinfo.dev_fn = h->pdev->devfn;
2404         pciinfo.board_id = h->board_id;
2405         if (copy_to_user(argp, &pciinfo, sizeof(pciinfo)))
2406                 return -EFAULT;
2407         return 0;
2408 }
2409
2410 static int hpsa_getdrivver_ioctl(struct ctlr_info *h, void __user *argp)
2411 {
2412         DriverVer_type DriverVer;
2413         unsigned char vmaj, vmin, vsubmin;
2414         int rc;
2415
2416         rc = sscanf(HPSA_DRIVER_VERSION, "%hhu.%hhu.%hhu",
2417                 &vmaj, &vmin, &vsubmin);
2418         if (rc != 3) {
2419                 dev_info(&h->pdev->dev, "driver version string '%s' "
2420                         "unrecognized.", HPSA_DRIVER_VERSION);
2421                 vmaj = 0;
2422                 vmin = 0;
2423                 vsubmin = 0;
2424         }
2425         DriverVer = (vmaj << 16) | (vmin << 8) | vsubmin;
2426         if (!argp)
2427                 return -EINVAL;
2428         if (copy_to_user(argp, &DriverVer, sizeof(DriverVer_type)))
2429                 return -EFAULT;
2430         return 0;
2431 }
2432
2433 static int hpsa_passthru_ioctl(struct ctlr_info *h, void __user *argp)
2434 {
2435         IOCTL_Command_struct iocommand;
2436         struct CommandList *c;
2437         char *buff = NULL;
2438         union u64bit temp64;
2439
2440         if (!argp)
2441                 return -EINVAL;
2442         if (!capable(CAP_SYS_RAWIO))
2443                 return -EPERM;
2444         if (copy_from_user(&iocommand, argp, sizeof(iocommand)))
2445                 return -EFAULT;
2446         if ((iocommand.buf_size < 1) &&
2447             (iocommand.Request.Type.Direction != XFER_NONE)) {
2448                 return -EINVAL;
2449         }
2450         if (iocommand.buf_size > 0) {
2451                 buff = kmalloc(iocommand.buf_size, GFP_KERNEL);
2452                 if (buff == NULL)
2453                         return -EFAULT;
2454         }
2455         if (iocommand.Request.Type.Direction == XFER_WRITE) {
2456                 /* Copy the data into the buffer we created */
2457                 if (copy_from_user(buff, iocommand.buf, iocommand.buf_size)) {
2458                         kfree(buff);
2459                         return -EFAULT;
2460                 }
2461         } else
2462                 memset(buff, 0, iocommand.buf_size);
2463         c = cmd_special_alloc(h);
2464         if (c == NULL) {
2465                 kfree(buff);
2466                 return -ENOMEM;
2467         }
2468         /* Fill in the command type */
2469         c->cmd_type = CMD_IOCTL_PEND;
2470         /* Fill in Command Header */
2471         c->Header.ReplyQueue = 0; /* unused in simple mode */
2472         if (iocommand.buf_size > 0) {   /* buffer to fill */
2473                 c->Header.SGList = 1;
2474                 c->Header.SGTotal = 1;
2475         } else  { /* no buffers to fill */
2476                 c->Header.SGList = 0;
2477                 c->Header.SGTotal = 0;
2478         }
2479         memcpy(&c->Header.LUN, &iocommand.LUN_info, sizeof(c->Header.LUN));
2480         /* use the kernel address the cmd block for tag */
2481         c->Header.Tag.lower = c->busaddr;
2482
2483         /* Fill in Request block */
2484         memcpy(&c->Request, &iocommand.Request,
2485                 sizeof(c->Request));
2486
2487         /* Fill in the scatter gather information */
2488         if (iocommand.buf_size > 0) {
2489                 temp64.val = pci_map_single(h->pdev, buff,
2490                         iocommand.buf_size, PCI_DMA_BIDIRECTIONAL);
2491                 c->SG[0].Addr.lower = temp64.val32.lower;
2492                 c->SG[0].Addr.upper = temp64.val32.upper;
2493                 c->SG[0].Len = iocommand.buf_size;
2494                 c->SG[0].Ext = 0; /* we are not chaining*/
2495         }
2496         hpsa_scsi_do_simple_cmd_core(h, c);
2497         hpsa_pci_unmap(h->pdev, c, 1, PCI_DMA_BIDIRECTIONAL);
2498         check_ioctl_unit_attention(h, c);
2499
2500         /* Copy the error information out */
2501         memcpy(&iocommand.error_info, c->err_info,
2502                 sizeof(iocommand.error_info));
2503         if (copy_to_user(argp, &iocommand, sizeof(iocommand))) {
2504                 kfree(buff);
2505                 cmd_special_free(h, c);
2506                 return -EFAULT;
2507         }
2508
2509         if (iocommand.Request.Type.Direction == XFER_READ) {
2510                 /* Copy the data out of the buffer we created */
2511                 if (copy_to_user(iocommand.buf, buff, iocommand.buf_size)) {
2512                         kfree(buff);
2513                         cmd_special_free(h, c);
2514                         return -EFAULT;
2515                 }
2516         }
2517         kfree(buff);
2518         cmd_special_free(h, c);
2519         return 0;
2520 }
2521
2522 static int hpsa_big_passthru_ioctl(struct ctlr_info *h, void __user *argp)
2523 {
2524         BIG_IOCTL_Command_struct *ioc;
2525         struct CommandList *c;
2526         unsigned char **buff = NULL;
2527         int *buff_size = NULL;
2528         union u64bit temp64;
2529         BYTE sg_used = 0;
2530         int status = 0;
2531         int i;
2532         u32 left;
2533         u32 sz;
2534         BYTE __user *data_ptr;
2535
2536         if (!argp)
2537                 return -EINVAL;
2538         if (!capable(CAP_SYS_RAWIO))
2539                 return -EPERM;
2540         ioc = (BIG_IOCTL_Command_struct *)
2541             kmalloc(sizeof(*ioc), GFP_KERNEL);
2542         if (!ioc) {
2543                 status = -ENOMEM;
2544                 goto cleanup1;
2545         }
2546         if (copy_from_user(ioc, argp, sizeof(*ioc))) {
2547                 status = -EFAULT;
2548                 goto cleanup1;
2549         }
2550         if ((ioc->buf_size < 1) &&
2551             (ioc->Request.Type.Direction != XFER_NONE)) {
2552                 status = -EINVAL;
2553                 goto cleanup1;
2554         }
2555         /* Check kmalloc limits  using all SGs */
2556         if (ioc->malloc_size > MAX_KMALLOC_SIZE) {
2557                 status = -EINVAL;
2558                 goto cleanup1;
2559         }
2560         if (ioc->buf_size > ioc->malloc_size * MAXSGENTRIES) {
2561                 status = -EINVAL;
2562                 goto cleanup1;
2563         }
2564         buff = kzalloc(MAXSGENTRIES * sizeof(char *), GFP_KERNEL);
2565         if (!buff) {
2566                 status = -ENOMEM;
2567                 goto cleanup1;
2568         }
2569         buff_size = kmalloc(MAXSGENTRIES * sizeof(int), GFP_KERNEL);
2570         if (!buff_size) {
2571                 status = -ENOMEM;
2572                 goto cleanup1;
2573         }
2574         left = ioc->buf_size;
2575         data_ptr = ioc->buf;
2576         while (left) {
2577                 sz = (left > ioc->malloc_size) ? ioc->malloc_size : left;
2578                 buff_size[sg_used] = sz;
2579                 buff[sg_used] = kmalloc(sz, GFP_KERNEL);
2580                 if (buff[sg_used] == NULL) {
2581                         status = -ENOMEM;
2582                         goto cleanup1;
2583                 }
2584                 if (ioc->Request.Type.Direction == XFER_WRITE) {
2585                         if (copy_from_user(buff[sg_used], data_ptr, sz)) {
2586                                 status = -ENOMEM;
2587                                 goto cleanup1;
2588                         }
2589                 } else
2590                         memset(buff[sg_used], 0, sz);
2591                 left -= sz;
2592                 data_ptr += sz;
2593                 sg_used++;
2594         }
2595         c = cmd_special_alloc(h);
2596         if (c == NULL) {
2597                 status = -ENOMEM;
2598                 goto cleanup1;
2599         }
2600         c->cmd_type = CMD_IOCTL_PEND;
2601         c->Header.ReplyQueue = 0;
2602
2603         if (ioc->buf_size > 0) {
2604                 c->Header.SGList = sg_used;
2605                 c->Header.SGTotal = sg_used;
2606         } else {
2607                 c->Header.SGList = 0;
2608                 c->Header.SGTotal = 0;
2609         }
2610         memcpy(&c->Header.LUN, &ioc->LUN_info, sizeof(c->Header.LUN));
2611         c->Header.Tag.lower = c->busaddr;
2612         memcpy(&c->Request, &ioc->Request, sizeof(c->Request));
2613         if (ioc->buf_size > 0) {
2614                 int i;
2615                 for (i = 0; i < sg_used; i++) {
2616                         temp64.val = pci_map_single(h->pdev, buff[i],
2617                                     buff_size[i], PCI_DMA_BIDIRECTIONAL);
2618                         c->SG[i].Addr.lower = temp64.val32.lower;
2619                         c->SG[i].Addr.upper = temp64.val32.upper;
2620                         c->SG[i].Len = buff_size[i];
2621                         /* we are not chaining */
2622                         c->SG[i].Ext = 0;
2623                 }
2624         }
2625         hpsa_scsi_do_simple_cmd_core(h, c);
2626         hpsa_pci_unmap(h->pdev, c, sg_used, PCI_DMA_BIDIRECTIONAL);
2627         check_ioctl_unit_attention(h, c);
2628         /* Copy the error information out */
2629         memcpy(&ioc->error_info, c->err_info, sizeof(ioc->error_info));
2630         if (copy_to_user(argp, ioc, sizeof(*ioc))) {
2631                 cmd_special_free(h, c);
2632                 status = -EFAULT;
2633                 goto cleanup1;
2634         }
2635         if (ioc->Request.Type.Direction == XFER_READ) {
2636                 /* Copy the data out of the buffer we created */
2637                 BYTE __user *ptr = ioc->buf;
2638                 for (i = 0; i < sg_used; i++) {
2639                         if (copy_to_user(ptr, buff[i], buff_size[i])) {
2640                                 cmd_special_free(h, c);
2641                                 status = -EFAULT;
2642                                 goto cleanup1;
2643                         }
2644                         ptr += buff_size[i];
2645                 }
2646         }
2647         cmd_special_free(h, c);
2648         status = 0;
2649 cleanup1:
2650         if (buff) {
2651                 for (i = 0; i < sg_used; i++)
2652                         kfree(buff[i]);
2653                 kfree(buff);
2654         }
2655         kfree(buff_size);
2656         kfree(ioc);
2657         return status;
2658 }
2659
2660 static void check_ioctl_unit_attention(struct ctlr_info *h,
2661         struct CommandList *c)
2662 {
2663         if (c->err_info->CommandStatus == CMD_TARGET_STATUS &&
2664                         c->err_info->ScsiStatus != SAM_STAT_CHECK_CONDITION)
2665                 (void) check_for_unit_attention(h, c);
2666 }
2667 /*
2668  * ioctl
2669  */
2670 static int hpsa_ioctl(struct scsi_device *dev, int cmd, void *arg)
2671 {
2672         struct ctlr_info *h;
2673         void __user *argp = (void __user *)arg;
2674
2675         h = sdev_to_hba(dev);
2676
2677         switch (cmd) {
2678         case CCISS_DEREGDISK:
2679         case CCISS_REGNEWDISK:
2680         case CCISS_REGNEWD:
2681                 hpsa_scan_start(h->scsi_host);
2682                 return 0;
2683         case CCISS_GETPCIINFO:
2684                 return hpsa_getpciinfo_ioctl(h, argp);
2685         case CCISS_GETDRIVVER:
2686                 return hpsa_getdrivver_ioctl(h, argp);
2687         case CCISS_PASSTHRU:
2688                 return hpsa_passthru_ioctl(h, argp);
2689         case CCISS_BIG_PASSTHRU:
2690                 return hpsa_big_passthru_ioctl(h, argp);
2691         default:
2692                 return -ENOTTY;
2693         }
2694 }
2695
2696 static void fill_cmd(struct CommandList *c, u8 cmd, struct ctlr_info *h,
2697         void *buff, size_t size, u8 page_code, unsigned char *scsi3addr,
2698         int cmd_type)
2699 {
2700         int pci_dir = XFER_NONE;
2701
2702         c->cmd_type = CMD_IOCTL_PEND;
2703         c->Header.ReplyQueue = 0;
2704         if (buff != NULL && size > 0) {
2705                 c->Header.SGList = 1;
2706                 c->Header.SGTotal = 1;
2707         } else {
2708                 c->Header.SGList = 0;
2709                 c->Header.SGTotal = 0;
2710         }
2711         c->Header.Tag.lower = c->busaddr;
2712         memcpy(c->Header.LUN.LunAddrBytes, scsi3addr, 8);
2713
2714         c->Request.Type.Type = cmd_type;
2715         if (cmd_type == TYPE_CMD) {
2716                 switch (cmd) {
2717                 case HPSA_INQUIRY:
2718                         /* are we trying to read a vital product page */
2719                         if (page_code != 0) {
2720                                 c->Request.CDB[1] = 0x01;
2721                                 c->Request.CDB[2] = page_code;
2722                         }
2723                         c->Request.CDBLen = 6;
2724                         c->Request.Type.Attribute = ATTR_SIMPLE;
2725                         c->Request.Type.Direction = XFER_READ;
2726                         c->Request.Timeout = 0;
2727                         c->Request.CDB[0] = HPSA_INQUIRY;
2728                         c->Request.CDB[4] = size & 0xFF;
2729                         break;
2730                 case HPSA_REPORT_LOG:
2731                 case HPSA_REPORT_PHYS:
2732                         /* Talking to controller so It's a physical command
2733                            mode = 00 target = 0.  Nothing to write.
2734                          */
2735                         c->Request.CDBLen = 12;
2736                         c->Request.Type.Attribute = ATTR_SIMPLE;
2737                         c->Request.Type.Direction = XFER_READ;
2738                         c->Request.Timeout = 0;
2739                         c->Request.CDB[0] = cmd;
2740                         c->Request.CDB[6] = (size >> 24) & 0xFF; /* MSB */
2741                         c->Request.CDB[7] = (size >> 16) & 0xFF;
2742                         c->Request.CDB[8] = (size >> 8) & 0xFF;
2743                         c->Request.CDB[9] = size & 0xFF;
2744                         break;
2745                 case HPSA_CACHE_FLUSH:
2746                         c->Request.CDBLen = 12;
2747                         c->Request.Type.Attribute = ATTR_SIMPLE;
2748                         c->Request.Type.Direction = XFER_WRITE;
2749                         c->Request.Timeout = 0;
2750                         c->Request.CDB[0] = BMIC_WRITE;
2751                         c->Request.CDB[6] = BMIC_CACHE_FLUSH;
2752                         break;
2753                 case TEST_UNIT_READY:
2754                         c->Request.CDBLen = 6;
2755                         c->Request.Type.Attribute = ATTR_SIMPLE;
2756                         c->Request.Type.Direction = XFER_NONE;
2757                         c->Request.Timeout = 0;
2758                         break;
2759                 default:
2760                         dev_warn(&h->pdev->dev, "unknown command 0x%c\n", cmd);
2761                         BUG();
2762                         return;
2763                 }
2764         } else if (cmd_type == TYPE_MSG) {
2765                 switch (cmd) {
2766
2767                 case  HPSA_DEVICE_RESET_MSG:
2768                         c->Request.CDBLen = 16;
2769                         c->Request.Type.Type =  1; /* It is a MSG not a CMD */
2770                         c->Request.Type.Attribute = ATTR_SIMPLE;
2771                         c->Request.Type.Direction = XFER_NONE;
2772                         c->Request.Timeout = 0; /* Don't time out */
2773                         c->Request.CDB[0] =  0x01; /* RESET_MSG is 0x01 */
2774                         c->Request.CDB[1] = 0x03;  /* Reset target above */
2775                         /* If bytes 4-7 are zero, it means reset the */
2776                         /* LunID device */
2777                         c->Request.CDB[4] = 0x00;
2778                         c->Request.CDB[5] = 0x00;
2779                         c->Request.CDB[6] = 0x00;
2780                         c->Request.CDB[7] = 0x00;
2781                 break;
2782
2783                 default:
2784                         dev_warn(&h->pdev->dev, "unknown message type %d\n",
2785                                 cmd);
2786                         BUG();
2787                 }
2788         } else {
2789                 dev_warn(&h->pdev->dev, "unknown command type %d\n", cmd_type);
2790                 BUG();
2791         }
2792
2793         switch (c->Request.Type.Direction) {
2794         case XFER_READ:
2795                 pci_dir = PCI_DMA_FROMDEVICE;
2796                 break;
2797         case XFER_WRITE:
2798                 pci_dir = PCI_DMA_TODEVICE;
2799                 break;
2800         case XFER_NONE:
2801                 pci_dir = PCI_DMA_NONE;
2802                 break;
2803         default:
2804                 pci_dir = PCI_DMA_BIDIRECTIONAL;
2805         }
2806
2807         hpsa_map_one(h->pdev, c, buff, size, pci_dir);
2808
2809         return;
2810 }
2811
2812 /*
2813  * Map (physical) PCI mem into (virtual) kernel space
2814  */
2815 static void __iomem *remap_pci_mem(ulong base, ulong size)
2816 {
2817         ulong page_base = ((ulong) base) & PAGE_MASK;
2818         ulong page_offs = ((ulong) base) - page_base;
2819         void __iomem *page_remapped = ioremap(page_base, page_offs + size);
2820
2821         return page_remapped ? (page_remapped + page_offs) : NULL;
2822 }
2823
2824 /* Takes cmds off the submission queue and sends them to the hardware,
2825  * then puts them on the queue of cmds waiting for completion.
2826  */
2827 static void start_io(struct ctlr_info *h)
2828 {
2829         struct CommandList *c;
2830
2831         while (!hlist_empty(&h->reqQ)) {
2832                 c = hlist_entry(h->reqQ.first, struct CommandList, list);
2833                 /* can't do anything if fifo is full */
2834                 if ((h->access.fifo_full(h))) {
2835                         dev_warn(&h->pdev->dev, "fifo full\n");
2836                         break;
2837                 }
2838
2839                 /* Get the first entry from the Request Q */
2840                 removeQ(c);
2841                 h->Qdepth--;
2842
2843                 /* Tell the controller execute command */
2844                 h->access.submit_command(h, c);
2845
2846                 /* Put job onto the completed Q */
2847                 addQ(&h->cmpQ, c);
2848         }
2849 }
2850
2851 static inline unsigned long get_next_completion(struct ctlr_info *h)
2852 {
2853         return h->access.command_completed(h);
2854 }
2855
2856 static inline bool interrupt_pending(struct ctlr_info *h)
2857 {
2858         return h->access.intr_pending(h);
2859 }
2860
2861 static inline long interrupt_not_for_us(struct ctlr_info *h)
2862 {
2863         return (h->access.intr_pending(h) == 0) ||
2864                 (h->interrupts_enabled == 0);
2865 }
2866
2867 static inline int bad_tag(struct ctlr_info *h, u32 tag_index,
2868         u32 raw_tag)
2869 {
2870         if (unlikely(tag_index >= h->nr_cmds)) {
2871                 dev_warn(&h->pdev->dev, "bad tag 0x%08x ignored.\n", raw_tag);
2872                 return 1;
2873         }
2874         return 0;
2875 }
2876
2877 static inline void finish_cmd(struct CommandList *c, u32 raw_tag)
2878 {
2879         removeQ(c);
2880         if (likely(c->cmd_type == CMD_SCSI))
2881                 complete_scsi_command(c, 0, raw_tag);
2882         else if (c->cmd_type == CMD_IOCTL_PEND)
2883                 complete(c->waiting);
2884 }
2885
2886 static inline u32 hpsa_tag_contains_index(u32 tag)
2887 {
2888 #define DIRECT_LOOKUP_BIT 0x10
2889         return tag & DIRECT_LOOKUP_BIT;
2890 }
2891
2892 static inline u32 hpsa_tag_to_index(u32 tag)
2893 {
2894 #define DIRECT_LOOKUP_SHIFT 5
2895         return tag >> DIRECT_LOOKUP_SHIFT;
2896 }
2897
2898 static inline u32 hpsa_tag_discard_error_bits(u32 tag)
2899 {
2900 #define HPSA_ERROR_BITS 0x03
2901         return tag & ~HPSA_ERROR_BITS;
2902 }
2903
2904 /* process completion of an indexed ("direct lookup") command */
2905 static inline u32 process_indexed_cmd(struct ctlr_info *h,
2906         u32 raw_tag)
2907 {
2908         u32 tag_index;
2909         struct CommandList *c;
2910
2911         tag_index = hpsa_tag_to_index(raw_tag);
2912         if (bad_tag(h, tag_index, raw_tag))
2913                 return next_command(h);
2914         c = h->cmd_pool + tag_index;
2915         finish_cmd(c, raw_tag);
2916         return next_command(h);
2917 }
2918
2919 /* process completion of a non-indexed command */
2920 static inline u32 process_nonindexed_cmd(struct ctlr_info *h,
2921         u32 raw_tag)
2922 {
2923         u32 tag;
2924         struct CommandList *c = NULL;
2925         struct hlist_node *tmp;
2926
2927         tag = hpsa_tag_discard_error_bits(raw_tag);
2928         hlist_for_each_entry(c, tmp, &h->cmpQ, list) {
2929                 if ((c->busaddr & 0xFFFFFFE0) == (tag & 0xFFFFFFE0)) {
2930                         finish_cmd(c, raw_tag);
2931                         return next_command(h);
2932                 }
2933         }
2934         bad_tag(h, h->nr_cmds + 1, raw_tag);
2935         return next_command(h);
2936 }
2937
2938 static irqreturn_t do_hpsa_intr_intx(int irq, void *dev_id)
2939 {
2940         struct ctlr_info *h = dev_id;
2941         unsigned long flags;
2942         u32 raw_tag;
2943
2944         if (interrupt_not_for_us(h))
2945                 return IRQ_NONE;
2946         spin_lock_irqsave(&h->lock, flags);
2947         while (interrupt_pending(h)) {
2948                 raw_tag = get_next_completion(h);
2949                 while (raw_tag != FIFO_EMPTY) {
2950                         if (hpsa_tag_contains_index(raw_tag))
2951                                 raw_tag = process_indexed_cmd(h, raw_tag);
2952                         else
2953                                 raw_tag = process_nonindexed_cmd(h, raw_tag);
2954                 }
2955         }
2956         spin_unlock_irqrestore(&h->lock, flags);
2957         return IRQ_HANDLED;
2958 }
2959
2960 static irqreturn_t do_hpsa_intr_msi(int irq, void *dev_id)
2961 {
2962         struct ctlr_info *h = dev_id;
2963         unsigned long flags;
2964         u32 raw_tag;
2965
2966         spin_lock_irqsave(&h->lock, flags);
2967         raw_tag = get_next_completion(h);
2968         while (raw_tag != FIFO_EMPTY) {
2969                 if (hpsa_tag_contains_index(raw_tag))
2970                         raw_tag = process_indexed_cmd(h, raw_tag);
2971                 else
2972                         raw_tag = process_nonindexed_cmd(h, raw_tag);
2973         }
2974         spin_unlock_irqrestore(&h->lock, flags);
2975         return IRQ_HANDLED;
2976 }
2977
2978 /* Send a message CDB to the firmware. */
2979 static __devinit int hpsa_message(struct pci_dev *pdev, unsigned char opcode,
2980                                                 unsigned char type)
2981 {
2982         struct Command {
2983                 struct CommandListHeader CommandHeader;
2984                 struct RequestBlock Request;
2985                 struct ErrDescriptor ErrorDescriptor;
2986         };
2987         struct Command *cmd;
2988         static const size_t cmd_sz = sizeof(*cmd) +
2989                                         sizeof(cmd->ErrorDescriptor);
2990         dma_addr_t paddr64;
2991         uint32_t paddr32, tag;
2992         void __iomem *vaddr;
2993         int i, err;
2994
2995         vaddr = pci_ioremap_bar(pdev, 0);
2996         if (vaddr == NULL)
2997                 return -ENOMEM;
2998
2999         /* The Inbound Post Queue only accepts 32-bit physical addresses for the
3000          * CCISS commands, so they must be allocated from the lower 4GiB of
3001          * memory.
3002          */
3003         err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
3004         if (err) {
3005                 iounmap(vaddr);
3006                 return -ENOMEM;
3007         }
3008
3009         cmd = pci_alloc_consistent(pdev, cmd_sz, &paddr64);
3010         if (cmd == NULL) {
3011                 iounmap(vaddr);
3012                 return -ENOMEM;
3013         }
3014
3015         /* This must fit, because of the 32-bit consistent DMA mask.  Also,
3016          * although there's no guarantee, we assume that the address is at
3017          * least 4-byte aligned (most likely, it's page-aligned).
3018          */
3019         paddr32 = paddr64;
3020
3021         cmd->CommandHeader.ReplyQueue = 0;
3022         cmd->CommandHeader.SGList = 0;
3023         cmd->CommandHeader.SGTotal = 0;
3024         cmd->CommandHeader.Tag.lower = paddr32;
3025         cmd->CommandHeader.Tag.upper = 0;
3026         memset(&cmd->CommandHeader.LUN.LunAddrBytes, 0, 8);
3027
3028         cmd->Request.CDBLen = 16;
3029         cmd->Request.Type.Type = TYPE_MSG;
3030         cmd->Request.Type.Attribute = ATTR_HEADOFQUEUE;
3031         cmd->Request.Type.Direction = XFER_NONE;
3032         cmd->Request.Timeout = 0; /* Don't time out */
3033         cmd->Request.CDB[0] = opcode;
3034         cmd->Request.CDB[1] = type;
3035         memset(&cmd->Request.CDB[2], 0, 14); /* rest of the CDB is reserved */
3036         cmd->ErrorDescriptor.Addr.lower = paddr32 + sizeof(*cmd);
3037         cmd->ErrorDescriptor.Addr.upper = 0;
3038         cmd->ErrorDescriptor.Len = sizeof(struct ErrorInfo);
3039
3040         writel(paddr32, vaddr + SA5_REQUEST_PORT_OFFSET);
3041
3042         for (i = 0; i < HPSA_MSG_SEND_RETRY_LIMIT; i++) {
3043                 tag = readl(vaddr + SA5_REPLY_PORT_OFFSET);
3044                 if (hpsa_tag_discard_error_bits(tag) == paddr32)
3045                         break;
3046                 msleep(HPSA_MSG_SEND_RETRY_INTERVAL_MSECS);
3047         }
3048
3049         iounmap(vaddr);
3050
3051         /* we leak the DMA buffer here ... no choice since the controller could
3052          *  still complete the command.
3053          */
3054         if (i == HPSA_MSG_SEND_RETRY_LIMIT) {
3055                 dev_err(&pdev->dev, "controller message %02x:%02x timed out\n",
3056                         opcode, type);
3057                 return -ETIMEDOUT;
3058         }
3059
3060         pci_free_consistent(pdev, cmd_sz, cmd, paddr64);
3061
3062         if (tag & HPSA_ERROR_BIT) {
3063                 dev_err(&pdev->dev, "controller message %02x:%02x failed\n",
3064                         opcode, type);
3065                 return -EIO;
3066         }
3067
3068         dev_info(&pdev->dev, "controller message %02x:%02x succeeded\n",
3069                 opcode, type);
3070         return 0;
3071 }
3072
3073 #define hpsa_soft_reset_controller(p) hpsa_message(p, 1, 0)
3074 #define hpsa_noop(p) hpsa_message(p, 3, 0)
3075
3076 static __devinit int hpsa_reset_msi(struct pci_dev *pdev)
3077 {
3078 /* the #defines are stolen from drivers/pci/msi.h. */
3079 #define msi_control_reg(base)           (base + PCI_MSI_FLAGS)
3080 #define PCI_MSIX_FLAGS_ENABLE           (1 << 15)
3081
3082         int pos;
3083         u16 control = 0;
3084
3085         pos = pci_find_capability(pdev, PCI_CAP_ID_MSI);
3086         if (pos) {
3087                 pci_read_config_word(pdev, msi_control_reg(pos), &control);
3088                 if (control & PCI_MSI_FLAGS_ENABLE) {
3089                         dev_info(&pdev->dev, "resetting MSI\n");
3090                         pci_write_config_word(pdev, msi_control_reg(pos),
3091                                         control & ~PCI_MSI_FLAGS_ENABLE);
3092                 }
3093         }
3094
3095         pos = pci_find_capability(pdev, PCI_CAP_ID_MSIX);
3096         if (pos) {
3097                 pci_read_config_word(pdev, msi_control_reg(pos), &control);
3098                 if (control & PCI_MSIX_FLAGS_ENABLE) {
3099                         dev_info(&pdev->dev, "resetting MSI-X\n");
3100                         pci_write_config_word(pdev, msi_control_reg(pos),
3101                                         control & ~PCI_MSIX_FLAGS_ENABLE);
3102                 }
3103         }
3104
3105         return 0;
3106 }
3107
3108 static int hpsa_controller_hard_reset(struct pci_dev *pdev,
3109         void * __iomem vaddr, bool use_doorbell)
3110 {
3111         u16 pmcsr;
3112         int pos;
3113
3114         if (use_doorbell) {
3115                 /* For everything after the P600, the PCI power state method
3116                  * of resetting the controller doesn't work, so we have this
3117                  * other way using the doorbell register.
3118                  */
3119                 dev_info(&pdev->dev, "using doorbell to reset controller\n");
3120                 writel(DOORBELL_CTLR_RESET, vaddr + SA5_DOORBELL);
3121                 msleep(1000);
3122         } else { /* Try to do it the PCI power state way */
3123
3124                 /* Quoting from the Open CISS Specification: "The Power
3125                  * Management Control/Status Register (CSR) controls the power
3126                  * state of the device.  The normal operating state is D0,
3127                  * CSR=00h.  The software off state is D3, CSR=03h.  To reset
3128                  * the controller, place the interface device in D3 then to D0,
3129                  * this causes a secondary PCI reset which will reset the
3130                  * controller." */
3131
3132                 pos = pci_find_capability(pdev, PCI_CAP_ID_PM);
3133                 if (pos == 0) {
3134                         dev_err(&pdev->dev,
3135                                 "hpsa_reset_controller: "
3136                                 "PCI PM not supported\n");
3137                         return -ENODEV;
3138                 }
3139                 dev_info(&pdev->dev, "using PCI PM to reset controller\n");
3140                 /* enter the D3hot power management state */
3141                 pci_read_config_word(pdev, pos + PCI_PM_CTRL, &pmcsr);
3142                 pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
3143                 pmcsr |= PCI_D3hot;
3144                 pci_write_config_word(pdev, pos + PCI_PM_CTRL, pmcsr);
3145
3146                 msleep(500);
3147
3148                 /* enter the D0 power management state */
3149                 pmcsr &= ~PCI_PM_CTRL_STATE_MASK;
3150                 pmcsr |= PCI_D0;
3151                 pci_write_config_word(pdev, pos + PCI_PM_CTRL, pmcsr);
3152
3153                 msleep(500);
3154         }
3155         return 0;
3156 }
3157
3158 /* This does a hard reset of the controller using PCI power management
3159  * states or the using the doorbell register.
3160  */
3161 static __devinit int hpsa_kdump_hard_reset_controller(struct pci_dev *pdev)
3162 {
3163         u16 saved_config_space[32];
3164         u64 cfg_offset;
3165         u32 cfg_base_addr;
3166         u64 cfg_base_addr_index;
3167         void __iomem *vaddr;
3168         unsigned long paddr;
3169         u32 misc_fw_support, active_transport;
3170         int rc, i;
3171         struct CfgTable __iomem *cfgtable;
3172         bool use_doorbell;
3173         u32 board_id;
3174
3175         /* For controllers as old as the P600, this is very nearly
3176          * the same thing as
3177          *
3178          * pci_save_state(pci_dev);
3179          * pci_set_power_state(pci_dev, PCI_D3hot);
3180          * pci_set_power_state(pci_dev, PCI_D0);
3181          * pci_restore_state(pci_dev);
3182          *
3183          * but we can't use these nice canned kernel routines on
3184          * kexec, because they also check the MSI/MSI-X state in PCI
3185          * configuration space and do the wrong thing when it is
3186          * set/cleared.  Also, the pci_save/restore_state functions
3187          * violate the ordering requirements for restoring the
3188          * configuration space from the CCISS document (see the
3189          * comment below).  So we roll our own ....
3190          *
3191          * For controllers newer than the P600, the pci power state
3192          * method of resetting doesn't work so we have another way
3193          * using the doorbell register.
3194          */
3195
3196         /* Exclude 640x boards.  These are two pci devices in one slot
3197          * which share a battery backed cache module.  One controls the
3198          * cache, the other accesses the cache through the one that controls
3199          * it.  If we reset the one controlling the cache, the other will
3200          * likely not be happy.  Just forbid resetting this conjoined mess.
3201          * The 640x isn't really supported by hpsa anyway.
3202          */
3203         hpsa_lookup_board_id(pdev, &board_id);
3204         if (board_id == 0x409C0E11 || board_id == 0x409D0E11)
3205                 return -ENOTSUPP;
3206
3207         for (i = 0; i < 32; i++)
3208                 pci_read_config_word(pdev, 2*i, &saved_config_space[i]);
3209
3210
3211         /* find the first memory BAR, so we can find the cfg table */
3212         rc = hpsa_pci_find_memory_BAR(pdev, &paddr);
3213         if (rc)
3214                 return rc;
3215         vaddr = remap_pci_mem(paddr, 0x250);
3216         if (!vaddr)
3217                 return -ENOMEM;
3218
3219         /* find cfgtable in order to check if reset via doorbell is supported */
3220         rc = hpsa_find_cfg_addrs(pdev, vaddr, &cfg_base_addr,
3221                                         &cfg_base_addr_index, &cfg_offset);
3222         if (rc)
3223                 goto unmap_vaddr;
3224         cfgtable = remap_pci_mem(pci_resource_start(pdev,
3225                        cfg_base_addr_index) + cfg_offset, sizeof(*cfgtable));
3226         if (!cfgtable) {
3227                 rc = -ENOMEM;
3228                 goto unmap_vaddr;
3229         }
3230
3231         /* If reset via doorbell register is supported, use that. */
3232         misc_fw_support = readl(&cfgtable->misc_fw_support);
3233         use_doorbell = misc_fw_support & MISC_FW_DOORBELL_RESET;
3234
3235         /* The doorbell reset seems to cause lockups on some Smart
3236          * Arrays (e.g. P410, P410i, maybe others).  Until this is
3237          * fixed or at least isolated, avoid the doorbell reset.
3238          */
3239         use_doorbell = 0;
3240
3241         rc = hpsa_controller_hard_reset(pdev, vaddr, use_doorbell);
3242         if (rc)
3243                 goto unmap_cfgtable;
3244
3245         /* Restore the PCI configuration space.  The Open CISS
3246          * Specification says, "Restore the PCI Configuration
3247          * Registers, offsets 00h through 60h. It is important to
3248          * restore the command register, 16-bits at offset 04h,
3249          * last. Do not restore the configuration status register,
3250          * 16-bits at offset 06h."  Note that the offset is 2*i.
3251          */
3252         for (i = 0; i < 32; i++) {
3253                 if (i == 2 || i == 3)
3254                         continue;
3255                 pci_write_config_word(pdev, 2*i, saved_config_space[i]);
3256         }
3257         wmb();
3258         pci_write_config_word(pdev, 4, saved_config_space[2]);
3259
3260         /* Some devices (notably the HP Smart Array 5i Controller)
3261            need a little pause here */
3262         msleep(HPSA_POST_RESET_PAUSE_MSECS);
3263
3264         /* Controller should be in simple mode at this point.  If it's not,
3265          * It means we're on one of those controllers which doesn't support
3266          * the doorbell reset method and on which the PCI power management reset
3267          * method doesn't work (P800, for example.)
3268          * In those cases, pretend the reset worked and hope for the best.
3269          */
3270         active_transport = readl(&cfgtable->TransportActive);
3271         if (active_transport & PERFORMANT_MODE) {
3272                 dev_warn(&pdev->dev, "Unable to successfully reset controller,"
3273                         " proceeding anyway.\n");
3274                 rc = -ENOTSUPP;
3275         }
3276
3277 unmap_cfgtable:
3278         iounmap(cfgtable);
3279
3280 unmap_vaddr:
3281         iounmap(vaddr);
3282         return rc;
3283 }
3284
3285 /*
3286  *  We cannot read the structure directly, for portability we must use
3287  *   the io functions.
3288  *   This is for debug only.
3289  */
3290 static void print_cfg_table(struct device *dev, struct CfgTable *tb)
3291 {
3292 #ifdef HPSA_DEBUG
3293         int i;
3294         char temp_name[17];
3295
3296         dev_info(dev, "Controller Configuration information\n");
3297         dev_info(dev, "------------------------------------\n");
3298         for (i = 0; i < 4; i++)
3299                 temp_name[i] = readb(&(tb->Signature[i]));
3300         temp_name[4] = '\0';
3301         dev_info(dev, "   Signature = %s\n", temp_name);
3302         dev_info(dev, "   Spec Number = %d\n", readl(&(tb->SpecValence)));
3303         dev_info(dev, "   Transport methods supported = 0x%x\n",
3304                readl(&(tb->TransportSupport)));
3305         dev_info(dev, "   Transport methods active = 0x%x\n",
3306                readl(&(tb->TransportActive)));
3307         dev_info(dev, "   Requested transport Method = 0x%x\n",
3308                readl(&(tb->HostWrite.TransportRequest)));
3309         dev_info(dev, "   Coalesce Interrupt Delay = 0x%x\n",
3310                readl(&(tb->HostWrite.CoalIntDelay)));
3311         dev_info(dev, "   Coalesce Interrupt Count = 0x%x\n",
3312                readl(&(tb->HostWrite.CoalIntCount)));
3313         dev_info(dev, "   Max outstanding commands = 0x%d\n",
3314                readl(&(tb->CmdsOutMax)));
3315         dev_info(dev, "   Bus Types = 0x%x\n", readl(&(tb->BusTypes)));
3316         for (i = 0; i < 16; i++)
3317                 temp_name[i] = readb(&(tb->ServerName[i]));
3318         temp_name[16] = '\0';
3319         dev_info(dev, "   Server Name = %s\n", temp_name);
3320         dev_info(dev, "   Heartbeat Counter = 0x%x\n\n\n",
3321                 readl(&(tb->HeartBeat)));
3322 #endif                          /* HPSA_DEBUG */
3323 }
3324
3325 static int find_PCI_BAR_index(struct pci_dev *pdev, unsigned long pci_bar_addr)
3326 {
3327         int i, offset, mem_type, bar_type;
3328
3329         if (pci_bar_addr == PCI_BASE_ADDRESS_0) /* looking for BAR zero? */
3330                 return 0;
3331         offset = 0;
3332         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++) {
3333                 bar_type = pci_resource_flags(pdev, i) & PCI_BASE_ADDRESS_SPACE;
3334                 if (bar_type == PCI_BASE_ADDRESS_SPACE_IO)
3335                         offset += 4;
3336                 else {
3337                         mem_type = pci_resource_flags(pdev, i) &
3338                             PCI_BASE_ADDRESS_MEM_TYPE_MASK;
3339                         switch (mem_type) {
3340                         case PCI_BASE_ADDRESS_MEM_TYPE_32:
3341                         case PCI_BASE_ADDRESS_MEM_TYPE_1M:
3342                                 offset += 4;    /* 32 bit */
3343                                 break;
3344                         case PCI_BASE_ADDRESS_MEM_TYPE_64:
3345                                 offset += 8;
3346                                 break;
3347                         default:        /* reserved in PCI 2.2 */
3348                                 dev_warn(&pdev->dev,
3349                                        "base address is invalid\n");
3350                                 return -1;
3351                                 break;
3352                         }
3353                 }
3354                 if (offset == pci_bar_addr - PCI_BASE_ADDRESS_0)
3355                         return i + 1;
3356         }
3357         return -1;
3358 }
3359
3360 /* If MSI/MSI-X is supported by the kernel we will try to enable it on
3361  * controllers that are capable. If not, we use IO-APIC mode.
3362  */
3363
3364 static void __devinit hpsa_interrupt_mode(struct ctlr_info *h)
3365 {
3366 #ifdef CONFIG_PCI_MSI
3367         int err;
3368         struct msix_entry hpsa_msix_entries[4] = { {0, 0}, {0, 1},
3369         {0, 2}, {0, 3}
3370         };
3371
3372         /* Some boards advertise MSI but don't really support it */
3373         if ((h->board_id == 0x40700E11) || (h->board_id == 0x40800E11) ||
3374             (h->board_id == 0x40820E11) || (h->board_id == 0x40830E11))
3375                 goto default_int_mode;
3376         if (pci_find_capability(h->pdev, PCI_CAP_ID_MSIX)) {
3377                 dev_info(&h->pdev->dev, "MSIX\n");
3378                 err = pci_enable_msix(h->pdev, hpsa_msix_entries, 4);
3379                 if (!err) {
3380                         h->intr[0] = hpsa_msix_entries[0].vector;
3381                         h->intr[1] = hpsa_msix_entries[1].vector;
3382                         h->intr[2] = hpsa_msix_entries[2].vector;
3383                         h->intr[3] = hpsa_msix_entries[3].vector;
3384                         h->msix_vector = 1;
3385                         return;
3386                 }
3387                 if (err > 0) {
3388                         dev_warn(&h->pdev->dev, "only %d MSI-X vectors "
3389                                "available\n", err);
3390                         goto default_int_mode;
3391                 } else {
3392                         dev_warn(&h->pdev->dev, "MSI-X init failed %d\n",
3393                                err);
3394                         goto default_int_mode;
3395                 }
3396         }
3397         if (pci_find_capability(h->pdev, PCI_CAP_ID_MSI)) {
3398                 dev_info(&h->pdev->dev, "MSI\n");
3399                 if (!pci_enable_msi(h->pdev))
3400                         h->msi_vector = 1;
3401                 else
3402                         dev_warn(&h->pdev->dev, "MSI init failed\n");
3403         }
3404 default_int_mode:
3405 #endif                          /* CONFIG_PCI_MSI */
3406         /* if we get here we're going to use the default interrupt mode */
3407         h->intr[PERF_MODE_INT] = h->pdev->irq;
3408 }
3409
3410 static int __devinit hpsa_lookup_board_id(struct pci_dev *pdev, u32 *board_id)
3411 {
3412         int i;
3413         u32 subsystem_vendor_id, subsystem_device_id;
3414
3415         subsystem_vendor_id = pdev->subsystem_vendor;
3416         subsystem_device_id = pdev->subsystem_device;
3417         *board_id = ((subsystem_device_id << 16) & 0xffff0000) |
3418                     subsystem_vendor_id;
3419
3420         for (i = 0; i < ARRAY_SIZE(products); i++)
3421                 if (*board_id == products[i].board_id)
3422                         return i;
3423
3424         if ((subsystem_vendor_id != PCI_VENDOR_ID_HP &&
3425                 subsystem_vendor_id != PCI_VENDOR_ID_COMPAQ) ||
3426                 !hpsa_allow_any) {
3427                 dev_warn(&pdev->dev, "unrecognized board ID: "
3428                         "0x%08x, ignoring.\n", *board_id);
3429                         return -ENODEV;
3430         }
3431         return ARRAY_SIZE(products) - 1; /* generic unknown smart array */
3432 }
3433
3434 static inline bool hpsa_board_disabled(struct pci_dev *pdev)
3435 {
3436         u16 command;
3437
3438         (void) pci_read_config_word(pdev, PCI_COMMAND, &command);
3439         return ((command & PCI_COMMAND_MEMORY) == 0);
3440 }
3441
3442 static int __devinit hpsa_pci_find_memory_BAR(struct pci_dev *pdev,
3443         unsigned long *memory_bar)
3444 {
3445         int i;
3446
3447         for (i = 0; i < DEVICE_COUNT_RESOURCE; i++)
3448                 if (pci_resource_flags(pdev, i) & IORESOURCE_MEM) {
3449                         /* addressing mode bits already removed */
3450                         *memory_bar = pci_resource_start(pdev, i);
3451                         dev_dbg(&pdev->dev, "memory BAR = %lx\n",
3452                                 *memory_bar);
3453                         return 0;
3454                 }
3455         dev_warn(&pdev->dev, "no memory BAR found\n");
3456         return -ENODEV;
3457 }
3458
3459 static int __devinit hpsa_wait_for_board_ready(struct ctlr_info *h)
3460 {
3461         int i;
3462         u32 scratchpad;
3463
3464         for (i = 0; i < HPSA_BOARD_READY_ITERATIONS; i++) {
3465                 scratchpad = readl(h->vaddr + SA5_SCRATCHPAD_OFFSET);
3466                 if (scratchpad == HPSA_FIRMWARE_READY)
3467                         return 0;
3468                 msleep(HPSA_BOARD_READY_POLL_INTERVAL_MSECS);
3469         }
3470         dev_warn(&h->pdev->dev, "board not ready, timed out.\n");
3471         return -ENODEV;
3472 }
3473
3474 static int __devinit hpsa_find_cfg_addrs(struct pci_dev *pdev,
3475         void __iomem *vaddr, u32 *cfg_base_addr, u64 *cfg_base_addr_index,
3476         u64 *cfg_offset)
3477 {
3478         *cfg_base_addr = readl(vaddr + SA5_CTCFG_OFFSET);
3479         *cfg_offset = readl(vaddr + SA5_CTMEM_OFFSET);
3480         *cfg_base_addr &= (u32) 0x0000ffff;
3481         *cfg_base_addr_index = find_PCI_BAR_index(pdev, *cfg_base_addr);
3482         if (*cfg_base_addr_index == -1) {
3483                 dev_warn(&pdev->dev, "cannot find cfg_base_addr_index\n");
3484                 return -ENODEV;
3485         }
3486         return 0;
3487 }
3488
3489 static int __devinit hpsa_find_cfgtables(struct ctlr_info *h)
3490 {
3491         u64 cfg_offset;
3492         u32 cfg_base_addr;
3493         u64 cfg_base_addr_index;
3494         u32 trans_offset;
3495         int rc;
3496
3497         rc = hpsa_find_cfg_addrs(h->pdev, h->vaddr, &cfg_base_addr,
3498                 &cfg_base_addr_index, &cfg_offset);
3499         if (rc)
3500                 return rc;
3501         h->cfgtable = remap_pci_mem(pci_resource_start(h->pdev,
3502                        cfg_base_addr_index) + cfg_offset, sizeof(*h->cfgtable));
3503         if (!h->cfgtable)
3504                 return -ENOMEM;
3505         /* Find performant mode table. */
3506         trans_offset = readl(&h->cfgtable->TransMethodOffset);
3507         h->transtable = remap_pci_mem(pci_resource_start(h->pdev,
3508                                 cfg_base_addr_index)+cfg_offset+trans_offset,
3509                                 sizeof(*h->transtable));
3510         if (!h->transtable)
3511                 return -ENOMEM;
3512         return 0;
3513 }
3514
3515 static void __devinit hpsa_get_max_perf_mode_cmds(struct ctlr_info *h)
3516 {
3517         h->max_commands = readl(&(h->cfgtable->MaxPerformantModeCommands));
3518         if (h->max_commands < 16) {
3519                 dev_warn(&h->pdev->dev, "Controller reports "
3520                         "max supported commands of %d, an obvious lie. "
3521                         "Using 16.  Ensure that firmware is up to date.\n",
3522                         h->max_commands);
3523                 h->max_commands = 16;
3524         }
3525 }
3526
3527 /* Interrogate the hardware for some limits:
3528  * max commands, max SG elements without chaining, and with chaining,
3529  * SG chain block size, etc.
3530  */
3531 static void __devinit hpsa_find_board_params(struct ctlr_info *h)
3532 {
3533         hpsa_get_max_perf_mode_cmds(h);
3534         h->nr_cmds = h->max_commands - 4; /* Allow room for some ioctls */
3535         h->maxsgentries = readl(&(h->cfgtable->MaxScatterGatherElements));
3536         /*
3537          * Limit in-command s/g elements to 32 save dma'able memory.
3538          * Howvever spec says if 0, use 31
3539          */
3540         h->max_cmd_sg_entries = 31;
3541         if (h->maxsgentries > 512) {
3542                 h->max_cmd_sg_entries = 32;
3543                 h->chainsize = h->maxsgentries - h->max_cmd_sg_entries + 1;
3544                 h->maxsgentries--; /* save one for chain pointer */
3545         } else {
3546                 h->maxsgentries = 31; /* default to traditional values */
3547                 h->chainsize = 0;
3548         }
3549 }
3550
3551 static inline bool hpsa_CISS_signature_present(struct ctlr_info *h)
3552 {
3553         if ((readb(&h->cfgtable->Signature[0]) != 'C') ||
3554             (readb(&h->cfgtable->Signature[1]) != 'I') ||
3555             (readb(&h->cfgtable->Signature[2]) != 'S') ||
3556             (readb(&h->cfgtable->Signature[3]) != 'S')) {
3557                 dev_warn(&h->pdev->dev, "not a valid CISS config table\n");
3558                 return false;
3559         }
3560         return true;
3561 }
3562
3563 /* Need to enable prefetch in the SCSI core for 6400 in x86 */
3564 static inline void hpsa_enable_scsi_prefetch(struct ctlr_info *h)
3565 {
3566 #ifdef CONFIG_X86
3567         u32 prefetch;
3568
3569         prefetch = readl(&(h->cfgtable->SCSI_Prefetch));
3570         prefetch |= 0x100;
3571         writel(prefetch, &(h->cfgtable->SCSI_Prefetch));
3572 #endif
3573 }
3574
3575 /* Disable DMA prefetch for the P600.  Otherwise an ASIC bug may result
3576  * in a prefetch beyond physical memory.
3577  */
3578 static inline void hpsa_p600_dma_prefetch_quirk(struct ctlr_info *h)
3579 {
3580         u32 dma_prefetch;
3581
3582         if (h->board_id != 0x3225103C)
3583                 return;
3584         dma_prefetch = readl(h->vaddr + I2O_DMA1_CFG);
3585         dma_prefetch |= 0x8000;
3586         writel(dma_prefetch, h->vaddr + I2O_DMA1_CFG);
3587 }
3588
3589 static void __devinit hpsa_wait_for_mode_change_ack(struct ctlr_info *h)
3590 {
3591         int i;
3592
3593         /* under certain very rare conditions, this can take awhile.
3594          * (e.g.: hot replace a failed 144GB drive in a RAID 5 set right
3595          * as we enter this code.)
3596          */
3597         for (i = 0; i < MAX_CONFIG_WAIT; i++) {
3598                 if (!(readl(h->vaddr + SA5_DOORBELL) & CFGTBL_ChangeReq))
3599                         break;
3600                 /* delay and try again */
3601                 msleep(10);
3602         }
3603 }
3604
3605 static int __devinit hpsa_enter_simple_mode(struct ctlr_info *h)
3606 {
3607         u32 trans_support;
3608
3609         trans_support = readl(&(h->cfgtable->TransportSupport));
3610         if (!(trans_support & SIMPLE_MODE))
3611                 return -ENOTSUPP;
3612
3613         h->max_commands = readl(&(h->cfgtable->CmdsOutMax));
3614         /* Update the field, and then ring the doorbell */
3615         writel(CFGTBL_Trans_Simple, &(h->cfgtable->HostWrite.TransportRequest));
3616         writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
3617         hpsa_wait_for_mode_change_ack(h);
3618         print_cfg_table(&h->pdev->dev, h->cfgtable);
3619         if (!(readl(&(h->cfgtable->TransportActive)) & CFGTBL_Trans_Simple)) {
3620                 dev_warn(&h->pdev->dev,
3621                         "unable to get board into simple mode\n");
3622                 return -ENODEV;
3623         }
3624         return 0;
3625 }
3626
3627 static int __devinit hpsa_pci_init(struct ctlr_info *h)
3628 {
3629         int prod_index, err;
3630
3631         prod_index = hpsa_lookup_board_id(h->pdev, &h->board_id);
3632         if (prod_index < 0)
3633                 return -ENODEV;
3634         h->product_name = products[prod_index].product_name;
3635         h->access = *(products[prod_index].access);
3636
3637         if (hpsa_board_disabled(h->pdev)) {
3638                 dev_warn(&h->pdev->dev, "controller appears to be disabled\n");
3639                 return -ENODEV;
3640         }
3641         err = pci_enable_device(h->pdev);
3642         if (err) {
3643                 dev_warn(&h->pdev->dev, "unable to enable PCI device\n");
3644                 return err;
3645         }
3646
3647         err = pci_request_regions(h->pdev, "hpsa");
3648         if (err) {
3649                 dev_err(&h->pdev->dev,
3650                         "cannot obtain PCI resources, aborting\n");
3651                 return err;
3652         }
3653         hpsa_interrupt_mode(h);
3654         err = hpsa_pci_find_memory_BAR(h->pdev, &h->paddr);
3655         if (err)
3656                 goto err_out_free_res;
3657         h->vaddr = remap_pci_mem(h->paddr, 0x250);
3658         if (!h->vaddr) {
3659                 err = -ENOMEM;
3660                 goto err_out_free_res;
3661         }
3662         err = hpsa_wait_for_board_ready(h);
3663         if (err)
3664                 goto err_out_free_res;
3665         err = hpsa_find_cfgtables(h);
3666         if (err)
3667                 goto err_out_free_res;
3668         hpsa_find_board_params(h);
3669
3670         if (!hpsa_CISS_signature_present(h)) {
3671                 err = -ENODEV;
3672                 goto err_out_free_res;
3673         }
3674         hpsa_enable_scsi_prefetch(h);
3675         hpsa_p600_dma_prefetch_quirk(h);
3676         err = hpsa_enter_simple_mode(h);
3677         if (err)
3678                 goto err_out_free_res;
3679         return 0;
3680
3681 err_out_free_res:
3682         if (h->transtable)
3683                 iounmap(h->transtable);
3684         if (h->cfgtable)
3685                 iounmap(h->cfgtable);
3686         if (h->vaddr)
3687                 iounmap(h->vaddr);
3688         /*
3689          * Deliberately omit pci_disable_device(): it does something nasty to
3690          * Smart Array controllers that pci_enable_device does not undo
3691          */
3692         pci_release_regions(h->pdev);
3693         return err;
3694 }
3695
3696 static void __devinit hpsa_hba_inquiry(struct ctlr_info *h)
3697 {
3698         int rc;
3699
3700 #define HBA_INQUIRY_BYTE_COUNT 64
3701         h->hba_inquiry_data = kmalloc(HBA_INQUIRY_BYTE_COUNT, GFP_KERNEL);
3702         if (!h->hba_inquiry_data)
3703                 return;
3704         rc = hpsa_scsi_do_inquiry(h, RAID_CTLR_LUNID, 0,
3705                 h->hba_inquiry_data, HBA_INQUIRY_BYTE_COUNT);
3706         if (rc != 0) {
3707                 kfree(h->hba_inquiry_data);
3708                 h->hba_inquiry_data = NULL;
3709         }
3710 }
3711
3712 static __devinit int hpsa_init_reset_devices(struct pci_dev *pdev)
3713 {
3714         int rc, i;
3715
3716         if (!reset_devices)
3717                 return 0;
3718
3719         /* Reset the controller with a PCI power-cycle or via doorbell */
3720         rc = hpsa_kdump_hard_reset_controller(pdev);
3721
3722         /* -ENOTSUPP here means we cannot reset the controller
3723          * but it's already (and still) up and running in
3724          * "performant mode".  Or, it might be 640x, which can't reset
3725          * due to concerns about shared bbwc between 6402/6404 pair.
3726          */
3727         if (rc == -ENOTSUPP)
3728                 return 0; /* just try to do the kdump anyhow. */
3729         if (rc)
3730                 return -ENODEV;
3731         if (hpsa_reset_msi(pdev))
3732                 return -ENODEV;
3733
3734         /* Now try to get the controller to respond to a no-op */
3735         for (i = 0; i < HPSA_POST_RESET_NOOP_RETRIES; i++) {
3736                 if (hpsa_noop(pdev) == 0)
3737                         break;
3738                 else
3739                         dev_warn(&pdev->dev, "no-op failed%s\n",
3740                                         (i < 11 ? "; re-trying" : ""));
3741         }
3742         return 0;
3743 }
3744
3745 static int __devinit hpsa_init_one(struct pci_dev *pdev,
3746                                     const struct pci_device_id *ent)
3747 {
3748         int dac, rc;
3749         struct ctlr_info *h;
3750
3751         if (number_of_controllers == 0)
3752                 printk(KERN_INFO DRIVER_NAME "\n");
3753
3754         rc = hpsa_init_reset_devices(pdev);
3755         if (rc)
3756                 return rc;
3757
3758         /* Command structures must be aligned on a 32-byte boundary because
3759          * the 5 lower bits of the address are used by the hardware. and by
3760          * the driver.  See comments in hpsa.h for more info.
3761          */
3762 #define COMMANDLIST_ALIGNMENT 32
3763         BUILD_BUG_ON(sizeof(struct CommandList) % COMMANDLIST_ALIGNMENT);
3764         h = kzalloc(sizeof(*h), GFP_KERNEL);
3765         if (!h)
3766                 return -ENOMEM;
3767
3768         h->pdev = pdev;
3769         h->busy_initializing = 1;
3770         INIT_HLIST_HEAD(&h->cmpQ);
3771         INIT_HLIST_HEAD(&h->reqQ);
3772         rc = hpsa_pci_init(h);
3773         if (rc != 0)
3774                 goto clean1;
3775
3776         sprintf(h->devname, "hpsa%d", number_of_controllers);
3777         h->ctlr = number_of_controllers;
3778         number_of_controllers++;
3779
3780         /* configure PCI DMA stuff */
3781         rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
3782         if (rc == 0) {
3783                 dac = 1;
3784         } else {
3785                 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
3786                 if (rc == 0) {
3787                         dac = 0;
3788                 } else {
3789                         dev_err(&pdev->dev, "no suitable DMA available\n");
3790                         goto clean1;
3791                 }
3792         }
3793
3794         /* make sure the board interrupts are off */
3795         h->access.set_intr_mask(h, HPSA_INTR_OFF);
3796
3797         if (h->msix_vector || h->msi_vector)
3798                 rc = request_irq(h->intr[PERF_MODE_INT], do_hpsa_intr_msi,
3799                                 IRQF_DISABLED, h->devname, h);
3800         else
3801                 rc = request_irq(h->intr[PERF_MODE_INT], do_hpsa_intr_intx,
3802                                 IRQF_DISABLED, h->devname, h);
3803         if (rc) {
3804                 dev_err(&pdev->dev, "unable to get irq %d for %s\n",
3805                        h->intr[PERF_MODE_INT], h->devname);
3806                 goto clean2;
3807         }
3808
3809         dev_info(&pdev->dev, "%s: <0x%x> at IRQ %d%s using DAC\n",
3810                h->devname, pdev->device,
3811                h->intr[PERF_MODE_INT], dac ? "" : " not");
3812
3813         h->cmd_pool_bits =
3814             kmalloc(((h->nr_cmds + BITS_PER_LONG -
3815                       1) / BITS_PER_LONG) * sizeof(unsigned long), GFP_KERNEL);
3816         h->cmd_pool = pci_alloc_consistent(h->pdev,
3817                     h->nr_cmds * sizeof(*h->cmd_pool),
3818                     &(h->cmd_pool_dhandle));
3819         h->errinfo_pool = pci_alloc_consistent(h->pdev,
3820                     h->nr_cmds * sizeof(*h->errinfo_pool),
3821                     &(h->errinfo_pool_dhandle));
3822         if ((h->cmd_pool_bits == NULL)
3823             || (h->cmd_pool == NULL)
3824             || (h->errinfo_pool == NULL)) {
3825                 dev_err(&pdev->dev, "out of memory");
3826                 rc = -ENOMEM;
3827                 goto clean4;
3828         }
3829         if (hpsa_allocate_sg_chain_blocks(h))
3830                 goto clean4;
3831         spin_lock_init(&h->lock);
3832         spin_lock_init(&h->scan_lock);
3833         init_waitqueue_head(&h->scan_wait_queue);
3834         h->scan_finished = 1; /* no scan currently in progress */
3835
3836         pci_set_drvdata(pdev, h);
3837         memset(h->cmd_pool_bits, 0,
3838                ((h->nr_cmds + BITS_PER_LONG -
3839                  1) / BITS_PER_LONG) * sizeof(unsigned long));
3840
3841         hpsa_scsi_setup(h);
3842
3843         /* Turn the interrupts on so we can service requests */
3844         h->access.set_intr_mask(h, HPSA_INTR_ON);
3845
3846         hpsa_put_ctlr_into_performant_mode(h);
3847         hpsa_hba_inquiry(h);
3848         hpsa_register_scsi(h);  /* hook ourselves into SCSI subsystem */
3849         h->busy_initializing = 0;
3850         return 1;
3851
3852 clean4:
3853         hpsa_free_sg_chain_blocks(h);
3854         kfree(h->cmd_pool_bits);
3855         if (h->cmd_pool)
3856                 pci_free_consistent(h->pdev,
3857                             h->nr_cmds * sizeof(struct CommandList),
3858                             h->cmd_pool, h->cmd_pool_dhandle);
3859         if (h->errinfo_pool)
3860                 pci_free_consistent(h->pdev,
3861                             h->nr_cmds * sizeof(struct ErrorInfo),
3862                             h->errinfo_pool,
3863                             h->errinfo_pool_dhandle);
3864         free_irq(h->intr[PERF_MODE_INT], h);
3865 clean2:
3866 clean1:
3867         h->busy_initializing = 0;
3868         kfree(h);
3869         return rc;
3870 }
3871
3872 static void hpsa_flush_cache(struct ctlr_info *h)
3873 {
3874         char *flush_buf;
3875         struct CommandList *c;
3876
3877         flush_buf = kzalloc(4, GFP_KERNEL);
3878         if (!flush_buf)
3879                 return;
3880
3881         c = cmd_special_alloc(h);
3882         if (!c) {
3883                 dev_warn(&h->pdev->dev, "cmd_special_alloc returned NULL!\n");
3884                 goto out_of_memory;
3885         }
3886         fill_cmd(c, HPSA_CACHE_FLUSH, h, flush_buf, 4, 0,
3887                 RAID_CTLR_LUNID, TYPE_CMD);
3888         hpsa_scsi_do_simple_cmd_with_retry(h, c, PCI_DMA_TODEVICE);
3889         if (c->err_info->CommandStatus != 0)
3890                 dev_warn(&h->pdev->dev,
3891                         "error flushing cache on controller\n");
3892         cmd_special_free(h, c);
3893 out_of_memory:
3894         kfree(flush_buf);
3895 }
3896
3897 static void hpsa_shutdown(struct pci_dev *pdev)
3898 {
3899         struct ctlr_info *h;
3900
3901         h = pci_get_drvdata(pdev);
3902         /* Turn board interrupts off  and send the flush cache command
3903          * sendcmd will turn off interrupt, and send the flush...
3904          * To write all data in the battery backed cache to disks
3905          */
3906         hpsa_flush_cache(h);
3907         h->access.set_intr_mask(h, HPSA_INTR_OFF);
3908         free_irq(h->intr[PERF_MODE_INT], h);
3909 #ifdef CONFIG_PCI_MSI
3910         if (h->msix_vector)
3911                 pci_disable_msix(h->pdev);
3912         else if (h->msi_vector)
3913                 pci_disable_msi(h->pdev);
3914 #endif                          /* CONFIG_PCI_MSI */
3915 }
3916
3917 static void __devexit hpsa_remove_one(struct pci_dev *pdev)
3918 {
3919         struct ctlr_info *h;
3920
3921         if (pci_get_drvdata(pdev) == NULL) {
3922                 dev_err(&pdev->dev, "unable to remove device \n");
3923                 return;
3924         }
3925         h = pci_get_drvdata(pdev);
3926         hpsa_unregister_scsi(h);        /* unhook from SCSI subsystem */
3927         hpsa_shutdown(pdev);
3928         iounmap(h->vaddr);
3929         iounmap(h->transtable);
3930         iounmap(h->cfgtable);
3931         hpsa_free_sg_chain_blocks(h);
3932         pci_free_consistent(h->pdev,
3933                 h->nr_cmds * sizeof(struct CommandList),
3934                 h->cmd_pool, h->cmd_pool_dhandle);
3935         pci_free_consistent(h->pdev,
3936                 h->nr_cmds * sizeof(struct ErrorInfo),
3937                 h->errinfo_pool, h->errinfo_pool_dhandle);
3938         pci_free_consistent(h->pdev, h->reply_pool_size,
3939                 h->reply_pool, h->reply_pool_dhandle);
3940         kfree(h->cmd_pool_bits);
3941         kfree(h->blockFetchTable);
3942         kfree(h->hba_inquiry_data);
3943         /*
3944          * Deliberately omit pci_disable_device(): it does something nasty to
3945          * Smart Array controllers that pci_enable_device does not undo
3946          */
3947         pci_release_regions(pdev);
3948         pci_set_drvdata(pdev, NULL);
3949         kfree(h);
3950 }
3951
3952 static int hpsa_suspend(__attribute__((unused)) struct pci_dev *pdev,
3953         __attribute__((unused)) pm_message_t state)
3954 {
3955         return -ENOSYS;
3956 }
3957
3958 static int hpsa_resume(__attribute__((unused)) struct pci_dev *pdev)
3959 {
3960         return -ENOSYS;
3961 }
3962
3963 static struct pci_driver hpsa_pci_driver = {
3964         .name = "hpsa",
3965         .probe = hpsa_init_one,
3966         .remove = __devexit_p(hpsa_remove_one),
3967         .id_table = hpsa_pci_device_id, /* id_table */
3968         .shutdown = hpsa_shutdown,
3969         .suspend = hpsa_suspend,
3970         .resume = hpsa_resume,
3971 };
3972
3973 /* Fill in bucket_map[], given nsgs (the max number of
3974  * scatter gather elements supported) and bucket[],
3975  * which is an array of 8 integers.  The bucket[] array
3976  * contains 8 different DMA transfer sizes (in 16
3977  * byte increments) which the controller uses to fetch
3978  * commands.  This function fills in bucket_map[], which
3979  * maps a given number of scatter gather elements to one of
3980  * the 8 DMA transfer sizes.  The point of it is to allow the
3981  * controller to only do as much DMA as needed to fetch the
3982  * command, with the DMA transfer size encoded in the lower
3983  * bits of the command address.
3984  */
3985 static void  calc_bucket_map(int bucket[], int num_buckets,
3986         int nsgs, int *bucket_map)
3987 {
3988         int i, j, b, size;
3989
3990         /* even a command with 0 SGs requires 4 blocks */
3991 #define MINIMUM_TRANSFER_BLOCKS 4
3992 #define NUM_BUCKETS 8
3993         /* Note, bucket_map must have nsgs+1 entries. */
3994         for (i = 0; i <= nsgs; i++) {
3995                 /* Compute size of a command with i SG entries */
3996                 size = i + MINIMUM_TRANSFER_BLOCKS;
3997                 b = num_buckets; /* Assume the biggest bucket */
3998                 /* Find the bucket that is just big enough */
3999                 for (j = 0; j < 8; j++) {
4000                         if (bucket[j] >= size) {
4001                                 b = j;
4002                                 break;
4003                         }
4004                 }
4005                 /* for a command with i SG entries, use bucket b. */
4006                 bucket_map[i] = b;
4007         }
4008 }
4009
4010 static __devinit void hpsa_enter_performant_mode(struct ctlr_info *h)
4011 {
4012         int i;
4013         unsigned long register_value;
4014
4015         /* This is a bit complicated.  There are 8 registers on
4016          * the controller which we write to to tell it 8 different
4017          * sizes of commands which there may be.  It's a way of
4018          * reducing the DMA done to fetch each command.  Encoded into
4019          * each command's tag are 3 bits which communicate to the controller
4020          * which of the eight sizes that command fits within.  The size of
4021          * each command depends on how many scatter gather entries there are.
4022          * Each SG entry requires 16 bytes.  The eight registers are programmed
4023          * with the number of 16-byte blocks a command of that size requires.
4024          * The smallest command possible requires 5 such 16 byte blocks.
4025          * the largest command possible requires MAXSGENTRIES + 4 16-byte
4026          * blocks.  Note, this only extends to the SG entries contained
4027          * within the command block, and does not extend to chained blocks
4028          * of SG elements.   bft[] contains the eight values we write to
4029          * the registers.  They are not evenly distributed, but have more
4030          * sizes for small commands, and fewer sizes for larger commands.
4031          */
4032         int bft[8] = {5, 6, 8, 10, 12, 20, 28, MAXSGENTRIES + 4};
4033         BUILD_BUG_ON(28 > MAXSGENTRIES + 4);
4034         /*  5 = 1 s/g entry or 4k
4035          *  6 = 2 s/g entry or 8k
4036          *  8 = 4 s/g entry or 16k
4037          * 10 = 6 s/g entry or 24k
4038          */
4039
4040         h->reply_pool_wraparound = 1; /* spec: init to 1 */
4041
4042         /* Controller spec: zero out this buffer. */
4043         memset(h->reply_pool, 0, h->reply_pool_size);
4044         h->reply_pool_head = h->reply_pool;
4045
4046         bft[7] = h->max_sg_entries + 4;
4047         calc_bucket_map(bft, ARRAY_SIZE(bft), 32, h->blockFetchTable);
4048         for (i = 0; i < 8; i++)
4049                 writel(bft[i], &h->transtable->BlockFetch[i]);
4050
4051         /* size of controller ring buffer */
4052         writel(h->max_commands, &h->transtable->RepQSize);
4053         writel(1, &h->transtable->RepQCount);
4054         writel(0, &h->transtable->RepQCtrAddrLow32);
4055         writel(0, &h->transtable->RepQCtrAddrHigh32);
4056         writel(h->reply_pool_dhandle, &h->transtable->RepQAddr0Low32);
4057         writel(0, &h->transtable->RepQAddr0High32);
4058         writel(CFGTBL_Trans_Performant,
4059                 &(h->cfgtable->HostWrite.TransportRequest));
4060         writel(CFGTBL_ChangeReq, h->vaddr + SA5_DOORBELL);
4061         hpsa_wait_for_mode_change_ack(h);
4062         register_value = readl(&(h->cfgtable->TransportActive));
4063         if (!(register_value & CFGTBL_Trans_Performant)) {
4064                 dev_warn(&h->pdev->dev, "unable to get board into"
4065                                         " performant mode\n");
4066                 return;
4067         }
4068 }
4069
4070 static __devinit void hpsa_put_ctlr_into_performant_mode(struct ctlr_info *h)
4071 {
4072         u32 trans_support;
4073
4074         trans_support = readl(&(h->cfgtable->TransportSupport));
4075         if (!(trans_support & PERFORMANT_MODE))
4076                 return;
4077
4078         hpsa_get_max_perf_mode_cmds(h);
4079         h->max_sg_entries = 32;
4080         /* Performant mode ring buffer and supporting data structures */
4081         h->reply_pool_size = h->max_commands * sizeof(u64);
4082         h->reply_pool = pci_alloc_consistent(h->pdev, h->reply_pool_size,
4083                                 &(h->reply_pool_dhandle));
4084
4085         /* Need a block fetch table for performant mode */
4086         h->blockFetchTable = kmalloc(((h->max_sg_entries+1) *
4087                                 sizeof(u32)), GFP_KERNEL);
4088
4089         if ((h->reply_pool == NULL)
4090                 || (h->blockFetchTable == NULL))
4091                 goto clean_up;
4092
4093         hpsa_enter_performant_mode(h);
4094
4095         /* Change the access methods to the performant access methods */
4096         h->access = SA5_performant_access;
4097         h->transMethod = CFGTBL_Trans_Performant;
4098
4099         return;
4100
4101 clean_up:
4102         if (h->reply_pool)
4103                 pci_free_consistent(h->pdev, h->reply_pool_size,
4104                         h->reply_pool, h->reply_pool_dhandle);
4105         kfree(h->blockFetchTable);
4106 }
4107
4108 /*
4109  *  This is it.  Register the PCI driver information for the cards we control
4110  *  the OS will call our registered routines when it finds one of our cards.
4111  */
4112 static int __init hpsa_init(void)
4113 {
4114         return pci_register_driver(&hpsa_pci_driver);
4115 }
4116
4117 static void __exit hpsa_cleanup(void)
4118 {
4119         pci_unregister_driver(&hpsa_pci_driver);
4120 }
4121
4122 module_init(hpsa_init);
4123 module_exit(hpsa_cleanup);