arch/s390/pci/pci_clp.c

   1 /*
   2  * Copyright IBM Corp. 2012
   3  *
   4  * Author(s):
   5  *   Jan Glauber <jang@linux.vnet.ibm.com>
   6  */
   7
   8 #define KMSG_COMPONENT "zpci"
   9 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  10
  11 #include <linux/compat.h>
  12 #include <linux/kernel.h>
  13 #include <linux/miscdevice.h>
  14 #include <linux/slab.h>
  15 #include <linux/err.h>
  16 #include <linux/delay.h>
  17 #include <linux/pci.h>
  18 #include <linux/uaccess.h>
  19 #include <asm/pci_debug.h>
  20 #include <asm/pci_clp.h>
  21 #include <asm/compat.h>
  22 #include <asm/clp.h>
  23 #include <uapi/asm/clp.h>
  24
  25 bool zpci_unique_uid;
  26
  27 static inline void zpci_err_clp(unsigned int rsp, int rc)
  28 {
  29         struct {
  30                 unsigned int rsp;
  31                 int rc;
  32         } __packed data = {rsp, rc};
  33
  34         zpci_err_hex(&data, sizeof(data));
  35 }
  36
  37 /*
  38  * Call Logical Processor with c=1, lps=0 and command 1
  39  * to get the bit mask of installed logical processors
  40  */
  41 static inline int clp_get_ilp(unsigned long *ilp)
  42 {
  43         unsigned long mask;
  44         int cc = 3;
  45
  46         asm volatile (
  47                 "       .insn   rrf,0xb9a00000,%[mask],%[cmd],8,0\n"
  48                 "0:     ipm     %[cc]\n"
  49                 "       srl     %[cc],28\n"
  50                 "1:\n"
  51                 EX_TABLE(0b, 1b)
  52                 : [cc] "+d" (cc), [mask] "=d" (mask) : [cmd] "a" (1)
  53                 : "cc");
  54         *ilp = mask;
  55         return cc;
  56 }
  57
  58 /*
  59  * Call Logical Processor with c=0, the give constant lps and an lpcb request.
  60  */
  61 static inline int clp_req(void *data, unsigned int lps)
  62 {
  63         struct { u8 _[CLP_BLK_SIZE]; } *req = data;
  64         u64 ignored;
  65         int cc = 3;
  66
  67         asm volatile (
  68                 "       .insn   rrf,0xb9a00000,%[ign],%[req],0,%[lps]\n"
  69                 "0:     ipm     %[cc]\n"
  70                 "       srl     %[cc],28\n"
  71                 "1:\n"
  72                 EX_TABLE(0b, 1b)
  73                 : [cc] "+d" (cc), [ign] "=d" (ignored), "+m" (*req)
  74                 : [req] "a" (req), [lps] "i" (lps)
  75                 : "cc");
  76         return cc;
  77 }
  78
  79 static void *clp_alloc_block(gfp_t gfp_mask)
  80 {
  81         return (void *) __get_free_pages(gfp_mask, get_order(CLP_BLK_SIZE));
  82 }
  83
  84 static void clp_free_block(void *ptr)
  85 {
  86         free_pages((unsigned long) ptr, get_order(CLP_BLK_SIZE));
  87 }
  88
  89 static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
  90                                       struct clp_rsp_query_pci_grp *response)
  91 {
  92         zdev->tlb_refresh = response->refresh;
  93         zdev->dma_mask = response->dasm;
  94         zdev->msi_addr = response->msia;
  95         zdev->max_msi = response->noi;
  96         zdev->fmb_update = response->mui;
  97
  98         switch (response->version) {
  99         case 1:
 100                 zdev->max_bus_speed = PCIE_SPEED_5_0GT;
 101                 break;
 102         default:
 103                 zdev->max_bus_speed = PCI_SPEED_UNKNOWN;
 104                 break;
 105         }
 106 }
 107
 108 static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid)
 109 {
 110         struct clp_req_rsp_query_pci_grp *rrb;
 111         int rc;
 112
 113         rrb = clp_alloc_block(GFP_KERNEL);
 114         if (!rrb)
 115                 return -ENOMEM;
 116
 117         memset(rrb, 0, sizeof(*rrb));
 118         rrb->request.hdr.len = sizeof(rrb->request);
 119         rrb->request.hdr.cmd = CLP_QUERY_PCI_FNGRP;
 120         rrb->response.hdr.len = sizeof(rrb->response);
 121         rrb->request.pfgid = pfgid;
 122
 123         rc = clp_req(rrb, CLP_LPS_PCI);
 124         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
 125                 clp_store_query_pci_fngrp(zdev, &rrb->response);
 126         else {
 127                 zpci_err("Q PCI FGRP:\n");
 128                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 129                 rc = -EIO;
 130         }
 131         clp_free_block(rrb);
 132         return rc;
 133 }
 134
 135 static int clp_store_query_pci_fn(struct zpci_dev *zdev,
 136                                   struct clp_rsp_query_pci *response)
 137 {
 138         int i;
 139
 140         for (i = 0; i < PCI_BAR_COUNT; i++) {
 141                 zdev->bars[i].val = le32_to_cpu(response->bar[i]);
 142                 zdev->bars[i].size = response->bar_size[i];
 143         }
 144         zdev->start_dma = response->sdma;
 145         zdev->end_dma = response->edma;
 146         zdev->pchid = response->pchid;
 147         zdev->pfgid = response->pfgid;
 148         zdev->pft = response->pft;
 149         zdev->vfn = response->vfn;
 150         zdev->uid = response->uid;
 151         zdev->fmb_length = sizeof(u32) * response->fmb_len;
 152
 153         memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip));
 154         if (response->util_str_avail) {
 155                 memcpy(zdev->util_str, response->util_str,
 156                        sizeof(zdev->util_str));
 157         }
 158
 159         return 0;
 160 }
 161
 162 static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh)
 163 {
 164         struct clp_req_rsp_query_pci *rrb;
 165         int rc;
 166
 167         rrb = clp_alloc_block(GFP_KERNEL);
 168         if (!rrb)
 169                 return -ENOMEM;
 170
 171         memset(rrb, 0, sizeof(*rrb));
 172         rrb->request.hdr.len = sizeof(rrb->request);
 173         rrb->request.hdr.cmd = CLP_QUERY_PCI_FN;
 174         rrb->response.hdr.len = sizeof(rrb->response);
 175         rrb->request.fh = fh;
 176
 177         rc = clp_req(rrb, CLP_LPS_PCI);
 178         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
 179                 rc = clp_store_query_pci_fn(zdev, &rrb->response);
 180                 if (rc)
 181                         goto out;
 182                 rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
 183         } else {
 184                 zpci_err("Q PCI FN:\n");
 185                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 186                 rc = -EIO;
 187         }
 188 out:
 189         clp_free_block(rrb);
 190         return rc;
 191 }
 192
 193 int clp_add_pci_device(u32 fid, u32 fh, int configured)
 194 {
 195         struct zpci_dev *zdev;
 196         int rc;
 197
 198         zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, configured);
 199         zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
 200         if (!zdev)
 201                 return -ENOMEM;
 202
 203         zdev->fh = fh;
 204         zdev->fid = fid;
 205
 206         /* Query function properties and update zdev */
 207         rc = clp_query_pci_fn(zdev, fh);
 208         if (rc)
 209                 goto error;
 210
 211         if (configured)
 212                 zdev->state = ZPCI_FN_STATE_CONFIGURED;
 213         else
 214                 zdev->state = ZPCI_FN_STATE_STANDBY;
 215
 216         rc = zpci_create_device(zdev);
 217         if (rc)
 218                 goto error;
 219         return 0;
 220
 221 error:
 222         kfree(zdev);
 223         return rc;
 224 }
 225
 226 /*
 227  * Enable/Disable a given PCI function defined by its function handle.
 228  */
 229 static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
 230 {
 231         struct clp_req_rsp_set_pci *rrb;
 232         int rc, retries = 100;
 233
 234         rrb = clp_alloc_block(GFP_KERNEL);
 235         if (!rrb)
 236                 return -ENOMEM;
 237
 238         do {
 239                 memset(rrb, 0, sizeof(*rrb));
 240                 rrb->request.hdr.len = sizeof(rrb->request);
 241                 rrb->request.hdr.cmd = CLP_SET_PCI_FN;
 242                 rrb->response.hdr.len = sizeof(rrb->response);
 243                 rrb->request.fh = *fh;
 244                 rrb->request.oc = command;
 245                 rrb->request.ndas = nr_dma_as;
 246
 247                 rc = clp_req(rrb, CLP_LPS_PCI);
 248                 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
 249                         retries--;
 250                         if (retries < 0)
 251                                 break;
 252                         msleep(20);
 253                 }
 254         } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
 255
 256         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
 257                 *fh = rrb->response.fh;
 258         else {
 259                 zpci_err("Set PCI FN:\n");
 260                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 261                 rc = -EIO;
 262         }
 263         clp_free_block(rrb);
 264         return rc;
 265 }
 266
 267 int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
 268 {
 269         u32 fh = zdev->fh;
 270         int rc;
 271
 272         rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
 273         if (!rc)
 274                 /* Success -> store enabled handle in zdev */
 275                 zdev->fh = fh;
 276
 277         zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
 278         return rc;
 279 }
 280
 281 int clp_disable_fh(struct zpci_dev *zdev)
 282 {
 283         u32 fh = zdev->fh;
 284         int rc;
 285
 286         if (!zdev_enabled(zdev))
 287                 return 0;
 288
 289         rc = clp_set_pci_fn(&fh, 0, CLP_SET_DISABLE_PCI_FN);
 290         if (!rc)
 291                 /* Success -> store disabled handle in zdev */
 292                 zdev->fh = fh;
 293
 294         zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
 295         return rc;
 296 }
 297
 298 static int clp_list_pci(struct clp_req_rsp_list_pci *rrb,
 299                         void (*cb)(struct clp_fh_list_entry *entry))
 300 {
 301         u64 resume_token = 0;
 302         int entries, i, rc;
 303
 304         do {
 305                 memset(rrb, 0, sizeof(*rrb));
 306                 rrb->request.hdr.len = sizeof(rrb->request);
 307                 rrb->request.hdr.cmd = CLP_LIST_PCI;
 308                 /* store as many entries as possible */
 309                 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
 310                 rrb->request.resume_token = resume_token;
 311
 312                 /* Get PCI function handle list */
 313                 rc = clp_req(rrb, CLP_LPS_PCI);
 314                 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
 315                         zpci_err("List PCI FN:\n");
 316                         zpci_err_clp(rrb->response.hdr.rsp, rc);
 317                         rc = -EIO;
 318                         goto out;
 319                 }
 320
 321                 zpci_unique_uid = rrb->response.uid_checking;
 322                 WARN_ON_ONCE(rrb->response.entry_size !=
 323                         sizeof(struct clp_fh_list_entry));
 324
 325                 entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
 326                         rrb->response.entry_size;
 327
 328                 resume_token = rrb->response.resume_token;
 329                 for (i = 0; i < entries; i++)
 330                         cb(&rrb->response.fh_list[i]);
 331         } while (resume_token);
 332 out:
 333         return rc;
 334 }
 335
 336 static void __clp_add(struct clp_fh_list_entry *entry)
 337 {
 338         if (!entry->vendor_id)
 339                 return;
 340
 341         clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
 342 }
 343
 344 static void __clp_rescan(struct clp_fh_list_entry *entry)
 345 {
 346         struct zpci_dev *zdev;
 347
 348         if (!entry->vendor_id)
 349                 return;
 350
 351         zdev = get_zdev_by_fid(entry->fid);
 352         if (!zdev) {
 353                 clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
 354                 return;
 355         }
 356
 357         if (!entry->config_state) {
 358                 /*
 359                  * The handle is already disabled, that means no iota/irq freeing via
 360                  * the firmware interfaces anymore. Need to free resources manually
 361                  * (DMA memory, debug, sysfs)...
 362                  */
 363                 zpci_stop_device(zdev);
 364         }
 365 }
 366
 367 static void __clp_update(struct clp_fh_list_entry *entry)
 368 {
 369         struct zpci_dev *zdev;
 370
 371         if (!entry->vendor_id)
 372                 return;
 373
 374         zdev = get_zdev_by_fid(entry->fid);
 375         if (!zdev)
 376                 return;
 377
 378         zdev->fh = entry->fh;
 379 }
 380
 381 int clp_scan_pci_devices(void)
 382 {
 383         struct clp_req_rsp_list_pci *rrb;
 384         int rc;
 385
 386         rrb = clp_alloc_block(GFP_KERNEL);
 387         if (!rrb)
 388                 return -ENOMEM;
 389
 390         rc = clp_list_pci(rrb, __clp_add);
 391
 392         clp_free_block(rrb);
 393         return rc;
 394 }
 395
 396 int clp_rescan_pci_devices(void)
 397 {
 398         struct clp_req_rsp_list_pci *rrb;
 399         int rc;
 400
 401         rrb = clp_alloc_block(GFP_KERNEL);
 402         if (!rrb)
 403                 return -ENOMEM;
 404
 405         rc = clp_list_pci(rrb, __clp_rescan);
 406
 407         clp_free_block(rrb);
 408         return rc;
 409 }
 410
 411 int clp_rescan_pci_devices_simple(void)
 412 {
 413         struct clp_req_rsp_list_pci *rrb;
 414         int rc;
 415
 416         rrb = clp_alloc_block(GFP_NOWAIT);
 417         if (!rrb)
 418                 return -ENOMEM;
 419
 420         rc = clp_list_pci(rrb, __clp_update);
 421
 422         clp_free_block(rrb);
 423         return rc;
 424 }
 425
 426 static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
 427 {
 428         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 429
 430         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 431             lpcb->response.hdr.len > limit)
 432                 return -EINVAL;
 433         return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
 434 }
 435
 436 static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
 437 {
 438         switch (lpcb->cmd) {
 439         case 0x0001: /* store logical-processor characteristics */
 440                 return clp_base_slpc(req, (void *) lpcb);
 441         default:
 442                 return -EINVAL;
 443         }
 444 }
 445
 446 static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
 447 {
 448         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 449
 450         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 451             lpcb->response.hdr.len > limit)
 452                 return -EINVAL;
 453         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 454 }
 455
 456 static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
 457 {
 458         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 459
 460         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 461             lpcb->response.hdr.len > limit)
 462                 return -EINVAL;
 463         if (lpcb->request.reserved2 != 0)
 464                 return -EINVAL;
 465         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 466 }
 467
 468 static int clp_pci_query(struct clp_req *req,
 469                          struct clp_req_rsp_query_pci *lpcb)
 470 {
 471         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 472
 473         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 474             lpcb->response.hdr.len > limit)
 475                 return -EINVAL;
 476         if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
 477                 return -EINVAL;
 478         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 479 }
 480
 481 static int clp_pci_query_grp(struct clp_req *req,
 482                              struct clp_req_rsp_query_pci_grp *lpcb)
 483 {
 484         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 485
 486         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 487             lpcb->response.hdr.len > limit)
 488                 return -EINVAL;
 489         if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
 490             lpcb->request.reserved4 != 0)
 491                 return -EINVAL;
 492         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 493 }
 494
 495 static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
 496 {
 497         switch (lpcb->cmd) {
 498         case 0x0001: /* store logical-processor characteristics */
 499                 return clp_pci_slpc(req, (void *) lpcb);
 500         case 0x0002: /* list PCI functions */
 501                 return clp_pci_list(req, (void *) lpcb);
 502         case 0x0003: /* query PCI function */
 503                 return clp_pci_query(req, (void *) lpcb);
 504         case 0x0004: /* query PCI function group */
 505                 return clp_pci_query_grp(req, (void *) lpcb);
 506         default:
 507                 return -EINVAL;
 508         }
 509 }
 510
 511 static int clp_normal_command(struct clp_req *req)
 512 {
 513         struct clp_req_hdr *lpcb;
 514         void __user *uptr;
 515         int rc;
 516
 517         rc = -EINVAL;
 518         if (req->lps != 0 && req->lps != 2)
 519                 goto out;
 520
 521         rc = -ENOMEM;
 522         lpcb = clp_alloc_block(GFP_KERNEL);
 523         if (!lpcb)
 524                 goto out;
 525
 526         rc = -EFAULT;
 527         uptr = (void __force __user *)(unsigned long) req->data_p;
 528         if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
 529                 goto out_free;
 530
 531         rc = -EINVAL;
 532         if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
 533                 goto out_free;
 534
 535         switch (req->lps) {
 536         case 0:
 537                 rc = clp_base_command(req, lpcb);
 538                 break;
 539         case 2:
 540                 rc = clp_pci_command(req, lpcb);
 541                 break;
 542         }
 543         if (rc)
 544                 goto out_free;
 545
 546         rc = -EFAULT;
 547         if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
 548                 goto out_free;
 549
 550         rc = 0;
 551
 552 out_free:
 553         clp_free_block(lpcb);
 554 out:
 555         return rc;
 556 }
 557
 558 static int clp_immediate_command(struct clp_req *req)
 559 {
 560         void __user *uptr;
 561         unsigned long ilp;
 562         int exists;
 563
 564         if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
 565                 return -EINVAL;
 566
 567         uptr = (void __force __user *)(unsigned long) req->data_p;
 568         if (req->cmd == 0) {
 569                 /* Command code 0: test for a specific processor */
 570                 exists = test_bit_inv(req->lps, &ilp);
 571                 return put_user(exists, (int __user *) uptr);
 572         }
 573         /* Command code 1: return bit mask of installed processors */
 574         return put_user(ilp, (unsigned long __user *) uptr);
 575 }
 576
 577 static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
 578                            unsigned long arg)
 579 {
 580         struct clp_req req;
 581         void __user *argp;
 582
 583         if (cmd != CLP_SYNC)
 584                 return -EINVAL;
 585
 586         argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
 587         if (copy_from_user(&req, argp, sizeof(req)))
 588                 return -EFAULT;
 589         if (req.r != 0)
 590                 return -EINVAL;
 591         return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
 592 }
 593
 594 static int clp_misc_release(struct inode *inode, struct file *filp)
 595 {
 596         return 0;
 597 }
 598
 599 static const struct file_operations clp_misc_fops = {
 600         .owner = THIS_MODULE,
 601         .open = nonseekable_open,
 602         .release = clp_misc_release,
 603         .unlocked_ioctl = clp_misc_ioctl,
 604         .compat_ioctl = clp_misc_ioctl,
 605         .llseek = no_llseek,
 606 };
 607
 608 static struct miscdevice clp_misc_device = {
 609         .minor = MISC_DYNAMIC_MINOR,
 610         .name = "clp",
 611         .fops = &clp_misc_fops,
 612 };
 613
 614 static int __init clp_misc_init(void)
 615 {
 616         return misc_register(&clp_misc_device);
 617 }
 618
 619 device_initcall(clp_misc_init);