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
 152         memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip));
 153         if (response->util_str_avail) {
 154                 memcpy(zdev->util_str, response->util_str,
 155                        sizeof(zdev->util_str));
 156         }
 157
 158         return 0;
 159 }
 160
 161 static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh)
 162 {
 163         struct clp_req_rsp_query_pci *rrb;
 164         int rc;
 165
 166         rrb = clp_alloc_block(GFP_KERNEL);
 167         if (!rrb)
 168                 return -ENOMEM;
 169
 170         memset(rrb, 0, sizeof(*rrb));
 171         rrb->request.hdr.len = sizeof(rrb->request);
 172         rrb->request.hdr.cmd = CLP_QUERY_PCI_FN;
 173         rrb->response.hdr.len = sizeof(rrb->response);
 174         rrb->request.fh = fh;
 175
 176         rc = clp_req(rrb, CLP_LPS_PCI);
 177         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
 178                 rc = clp_store_query_pci_fn(zdev, &rrb->response);
 179                 if (rc)
 180                         goto out;
 181                 rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
 182         } else {
 183                 zpci_err("Q PCI FN:\n");
 184                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 185                 rc = -EIO;
 186         }
 187 out:
 188         clp_free_block(rrb);
 189         return rc;
 190 }
 191
 192 int clp_add_pci_device(u32 fid, u32 fh, int configured)
 193 {
 194         struct zpci_dev *zdev;
 195         int rc;
 196
 197         zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, configured);
 198         zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
 199         if (!zdev)
 200                 return -ENOMEM;
 201
 202         zdev->fh = fh;
 203         zdev->fid = fid;
 204
 205         /* Query function properties and update zdev */
 206         rc = clp_query_pci_fn(zdev, fh);
 207         if (rc)
 208                 goto error;
 209
 210         if (configured)
 211                 zdev->state = ZPCI_FN_STATE_CONFIGURED;
 212         else
 213                 zdev->state = ZPCI_FN_STATE_STANDBY;
 214
 215         rc = zpci_create_device(zdev);
 216         if (rc)
 217                 goto error;
 218         return 0;
 219
 220 error:
 221         kfree(zdev);
 222         return rc;
 223 }
 224
 225 /*
 226  * Enable/Disable a given PCI function defined by its function handle.
 227  */
 228 static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
 229 {
 230         struct clp_req_rsp_set_pci *rrb;
 231         int rc, retries = 100;
 232
 233         rrb = clp_alloc_block(GFP_KERNEL);
 234         if (!rrb)
 235                 return -ENOMEM;
 236
 237         do {
 238                 memset(rrb, 0, sizeof(*rrb));
 239                 rrb->request.hdr.len = sizeof(rrb->request);
 240                 rrb->request.hdr.cmd = CLP_SET_PCI_FN;
 241                 rrb->response.hdr.len = sizeof(rrb->response);
 242                 rrb->request.fh = *fh;
 243                 rrb->request.oc = command;
 244                 rrb->request.ndas = nr_dma_as;
 245
 246                 rc = clp_req(rrb, CLP_LPS_PCI);
 247                 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
 248                         retries--;
 249                         if (retries < 0)
 250                                 break;
 251                         msleep(20);
 252                 }
 253         } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
 254
 255         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
 256                 *fh = rrb->response.fh;
 257         else {
 258                 zpci_err("Set PCI FN:\n");
 259                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 260                 rc = -EIO;
 261         }
 262         clp_free_block(rrb);
 263         return rc;
 264 }
 265
 266 int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
 267 {
 268         u32 fh = zdev->fh;
 269         int rc;
 270
 271         rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
 272         if (!rc)
 273                 /* Success -> store enabled handle in zdev */
 274                 zdev->fh = fh;
 275
 276         zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
 277         return rc;
 278 }
 279
 280 int clp_disable_fh(struct zpci_dev *zdev)
 281 {
 282         u32 fh = zdev->fh;
 283         int rc;
 284
 285         if (!zdev_enabled(zdev))
 286                 return 0;
 287
 288         rc = clp_set_pci_fn(&fh, 0, CLP_SET_DISABLE_PCI_FN);
 289         if (!rc)
 290                 /* Success -> store disabled handle in zdev */
 291                 zdev->fh = fh;
 292
 293         zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
 294         return rc;
 295 }
 296
 297 static int clp_list_pci(struct clp_req_rsp_list_pci *rrb,
 298                         void (*cb)(struct clp_fh_list_entry *entry))
 299 {
 300         u64 resume_token = 0;
 301         int entries, i, rc;
 302
 303         do {
 304                 memset(rrb, 0, sizeof(*rrb));
 305                 rrb->request.hdr.len = sizeof(rrb->request);
 306                 rrb->request.hdr.cmd = CLP_LIST_PCI;
 307                 /* store as many entries as possible */
 308                 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
 309                 rrb->request.resume_token = resume_token;
 310
 311                 /* Get PCI function handle list */
 312                 rc = clp_req(rrb, CLP_LPS_PCI);
 313                 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
 314                         zpci_err("List PCI FN:\n");
 315                         zpci_err_clp(rrb->response.hdr.rsp, rc);
 316                         rc = -EIO;
 317                         goto out;
 318                 }
 319
 320                 zpci_unique_uid = rrb->response.uid_checking;
 321                 WARN_ON_ONCE(rrb->response.entry_size !=
 322                         sizeof(struct clp_fh_list_entry));
 323
 324                 entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
 325                         rrb->response.entry_size;
 326
 327                 resume_token = rrb->response.resume_token;
 328                 for (i = 0; i < entries; i++)
 329                         cb(&rrb->response.fh_list[i]);
 330         } while (resume_token);
 331 out:
 332         return rc;
 333 }
 334
 335 static void __clp_add(struct clp_fh_list_entry *entry)
 336 {
 337         if (!entry->vendor_id)
 338                 return;
 339
 340         clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
 341 }
 342
 343 static void __clp_rescan(struct clp_fh_list_entry *entry)
 344 {
 345         struct zpci_dev *zdev;
 346
 347         if (!entry->vendor_id)
 348                 return;
 349
 350         zdev = get_zdev_by_fid(entry->fid);
 351         if (!zdev) {
 352                 clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
 353                 return;
 354         }
 355
 356         if (!entry->config_state) {
 357                 /*
 358                  * The handle is already disabled, that means no iota/irq freeing via
 359                  * the firmware interfaces anymore. Need to free resources manually
 360                  * (DMA memory, debug, sysfs)...
 361                  */
 362                 zpci_stop_device(zdev);
 363         }
 364 }
 365
 366 static void __clp_update(struct clp_fh_list_entry *entry)
 367 {
 368         struct zpci_dev *zdev;
 369
 370         if (!entry->vendor_id)
 371                 return;
 372
 373         zdev = get_zdev_by_fid(entry->fid);
 374         if (!zdev)
 375                 return;
 376
 377         zdev->fh = entry->fh;
 378 }
 379
 380 int clp_scan_pci_devices(void)
 381 {
 382         struct clp_req_rsp_list_pci *rrb;
 383         int rc;
 384
 385         rrb = clp_alloc_block(GFP_KERNEL);
 386         if (!rrb)
 387                 return -ENOMEM;
 388
 389         rc = clp_list_pci(rrb, __clp_add);
 390
 391         clp_free_block(rrb);
 392         return rc;
 393 }
 394
 395 int clp_rescan_pci_devices(void)
 396 {
 397         struct clp_req_rsp_list_pci *rrb;
 398         int rc;
 399
 400         rrb = clp_alloc_block(GFP_KERNEL);
 401         if (!rrb)
 402                 return -ENOMEM;
 403
 404         rc = clp_list_pci(rrb, __clp_rescan);
 405
 406         clp_free_block(rrb);
 407         return rc;
 408 }
 409
 410 int clp_rescan_pci_devices_simple(void)
 411 {
 412         struct clp_req_rsp_list_pci *rrb;
 413         int rc;
 414
 415         rrb = clp_alloc_block(GFP_NOWAIT);
 416         if (!rrb)
 417                 return -ENOMEM;
 418
 419         rc = clp_list_pci(rrb, __clp_update);
 420
 421         clp_free_block(rrb);
 422         return rc;
 423 }
 424
 425 static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
 426 {
 427         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 428
 429         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 430             lpcb->response.hdr.len > limit)
 431                 return -EINVAL;
 432         return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
 433 }
 434
 435 static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
 436 {
 437         switch (lpcb->cmd) {
 438         case 0x0001: /* store logical-processor characteristics */
 439                 return clp_base_slpc(req, (void *) lpcb);
 440         default:
 441                 return -EINVAL;
 442         }
 443 }
 444
 445 static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
 446 {
 447         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 448
 449         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 450             lpcb->response.hdr.len > limit)
 451                 return -EINVAL;
 452         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 453 }
 454
 455 static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
 456 {
 457         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 458
 459         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 460             lpcb->response.hdr.len > limit)
 461                 return -EINVAL;
 462         if (lpcb->request.reserved2 != 0)
 463                 return -EINVAL;
 464         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 465 }
 466
 467 static int clp_pci_query(struct clp_req *req,
 468                          struct clp_req_rsp_query_pci *lpcb)
 469 {
 470         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 471
 472         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 473             lpcb->response.hdr.len > limit)
 474                 return -EINVAL;
 475         if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
 476                 return -EINVAL;
 477         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 478 }
 479
 480 static int clp_pci_query_grp(struct clp_req *req,
 481                              struct clp_req_rsp_query_pci_grp *lpcb)
 482 {
 483         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 484
 485         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 486             lpcb->response.hdr.len > limit)
 487                 return -EINVAL;
 488         if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
 489             lpcb->request.reserved4 != 0)
 490                 return -EINVAL;
 491         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 492 }
 493
 494 static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
 495 {
 496         switch (lpcb->cmd) {
 497         case 0x0001: /* store logical-processor characteristics */
 498                 return clp_pci_slpc(req, (void *) lpcb);
 499         case 0x0002: /* list PCI functions */
 500                 return clp_pci_list(req, (void *) lpcb);
 501         case 0x0003: /* query PCI function */
 502                 return clp_pci_query(req, (void *) lpcb);
 503         case 0x0004: /* query PCI function group */
 504                 return clp_pci_query_grp(req, (void *) lpcb);
 505         default:
 506                 return -EINVAL;
 507         }
 508 }
 509
 510 static int clp_normal_command(struct clp_req *req)
 511 {
 512         struct clp_req_hdr *lpcb;
 513         void __user *uptr;
 514         int rc;
 515
 516         rc = -EINVAL;
 517         if (req->lps != 0 && req->lps != 2)
 518                 goto out;
 519
 520         rc = -ENOMEM;
 521         lpcb = clp_alloc_block(GFP_KERNEL);
 522         if (!lpcb)
 523                 goto out;
 524
 525         rc = -EFAULT;
 526         uptr = (void __force __user *)(unsigned long) req->data_p;
 527         if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
 528                 goto out_free;
 529
 530         rc = -EINVAL;
 531         if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
 532                 goto out_free;
 533
 534         switch (req->lps) {
 535         case 0:
 536                 rc = clp_base_command(req, lpcb);
 537                 break;
 538         case 2:
 539                 rc = clp_pci_command(req, lpcb);
 540                 break;
 541         }
 542         if (rc)
 543                 goto out_free;
 544
 545         rc = -EFAULT;
 546         if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
 547                 goto out_free;
 548
 549         rc = 0;
 550
 551 out_free:
 552         clp_free_block(lpcb);
 553 out:
 554         return rc;
 555 }
 556
 557 static int clp_immediate_command(struct clp_req *req)
 558 {
 559         void __user *uptr;
 560         unsigned long ilp;
 561         int exists;
 562
 563         if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
 564                 return -EINVAL;
 565
 566         uptr = (void __force __user *)(unsigned long) req->data_p;
 567         if (req->cmd == 0) {
 568                 /* Command code 0: test for a specific processor */
 569                 exists = test_bit_inv(req->lps, &ilp);
 570                 return put_user(exists, (int __user *) uptr);
 571         }
 572         /* Command code 1: return bit mask of installed processors */
 573         return put_user(ilp, (unsigned long __user *) uptr);
 574 }
 575
 576 static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
 577                            unsigned long arg)
 578 {
 579         struct clp_req req;
 580         void __user *argp;
 581
 582         if (cmd != CLP_SYNC)
 583                 return -EINVAL;
 584
 585         argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
 586         if (copy_from_user(&req, argp, sizeof(req)))
 587                 return -EFAULT;
 588         if (req.r != 0)
 589                 return -EINVAL;
 590         return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
 591 }
 592
 593 static int clp_misc_release(struct inode *inode, struct file *filp)
 594 {
 595         return 0;
 596 }
 597
 598 static const struct file_operations clp_misc_fops = {
 599         .owner = THIS_MODULE,
 600         .open = nonseekable_open,
 601         .release = clp_misc_release,
 602         .unlocked_ioctl = clp_misc_ioctl,
 603         .compat_ioctl = clp_misc_ioctl,
 604         .llseek = no_llseek,
 605 };
 606
 607 static struct miscdevice clp_misc_device = {
 608         .minor = MISC_DYNAMIC_MINOR,
 609         .name = "clp",
 610         .fops = &clp_misc_fops,
 611 };
 612
 613 static int __init clp_misc_init(void)
 614 {
 615         return misc_register(&clp_misc_device);
 616 }
 617
 618 device_initcall(clp_misc_init);