arch/s390/pci/pci_clp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright IBM Corp. 2012
   4  *
   5  * Author(s):
   6  *   Jan Glauber <jang@linux.vnet.ibm.com>
   7  */
   8
   9 #define KMSG_COMPONENT "zpci"
  10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  11
  12 #include <linux/compat.h>
  13 #include <linux/kernel.h>
  14 #include <linux/miscdevice.h>
  15 #include <linux/slab.h>
  16 #include <linux/err.h>
  17 #include <linux/delay.h>
  18 #include <linux/pci.h>
  19 #include <linux/uaccess.h>
  20 #include <asm/pci_debug.h>
  21 #include <asm/pci_clp.h>
  22 #include <asm/clp.h>
  23 #include <uapi/asm/clp.h>
  24
  25 bool zpci_unique_uid;
  26
  27 static void update_uid_checking(bool new)
  28 {
  29         if (zpci_unique_uid != new)
  30                 zpci_dbg(1, "uid checking:%d\n", new);
  31
  32         zpci_unique_uid = new;
  33 }
  34
  35 static inline void zpci_err_clp(unsigned int rsp, int rc)
  36 {
  37         struct {
  38                 unsigned int rsp;
  39                 int rc;
  40         } __packed data = {rsp, rc};
  41
  42         zpci_err_hex(&data, sizeof(data));
  43 }
  44
  45 /*
  46  * Call Logical Processor with c=1, lps=0 and command 1
  47  * to get the bit mask of installed logical processors
  48  */
  49 static inline int clp_get_ilp(unsigned long *ilp)
  50 {
  51         unsigned long mask;
  52         int cc = 3;
  53
  54         asm volatile (
  55                 "       .insn   rrf,0xb9a00000,%[mask],%[cmd],8,0\n"
  56                 "0:     ipm     %[cc]\n"
  57                 "       srl     %[cc],28\n"
  58                 "1:\n"
  59                 EX_TABLE(0b, 1b)
  60                 : [cc] "+d" (cc), [mask] "=d" (mask) : [cmd] "a" (1)
  61                 : "cc");
  62         *ilp = mask;
  63         return cc;
  64 }
  65
  66 /*
  67  * Call Logical Processor with c=0, the give constant lps and an lpcb request.
  68  */
  69 static inline int clp_req(void *data, unsigned int lps)
  70 {
  71         struct { u8 _[CLP_BLK_SIZE]; } *req = data;
  72         u64 ignored;
  73         int cc = 3;
  74
  75         asm volatile (
  76                 "       .insn   rrf,0xb9a00000,%[ign],%[req],0,%[lps]\n"
  77                 "0:     ipm     %[cc]\n"
  78                 "       srl     %[cc],28\n"
  79                 "1:\n"
  80                 EX_TABLE(0b, 1b)
  81                 : [cc] "+d" (cc), [ign] "=d" (ignored), "+m" (*req)
  82                 : [req] "a" (req), [lps] "i" (lps)
  83                 : "cc");
  84         return cc;
  85 }
  86
  87 static void *clp_alloc_block(gfp_t gfp_mask)
  88 {
  89         return (void *) __get_free_pages(gfp_mask, get_order(CLP_BLK_SIZE));
  90 }
  91
  92 static void clp_free_block(void *ptr)
  93 {
  94         free_pages((unsigned long) ptr, get_order(CLP_BLK_SIZE));
  95 }
  96
  97 static void clp_store_query_pci_fngrp(struct zpci_dev *zdev,
  98                                       struct clp_rsp_query_pci_grp *response)
  99 {
 100         zdev->tlb_refresh = response->refresh;
 101         zdev->dma_mask = response->dasm;
 102         zdev->msi_addr = response->msia;
 103         zdev->max_msi = response->noi;
 104         zdev->fmb_update = response->mui;
 105
 106         switch (response->version) {
 107         case 1:
 108                 zdev->max_bus_speed = PCIE_SPEED_5_0GT;
 109                 break;
 110         default:
 111                 zdev->max_bus_speed = PCI_SPEED_UNKNOWN;
 112                 break;
 113         }
 114 }
 115
 116 static int clp_query_pci_fngrp(struct zpci_dev *zdev, u8 pfgid)
 117 {
 118         struct clp_req_rsp_query_pci_grp *rrb;
 119         int rc;
 120
 121         rrb = clp_alloc_block(GFP_KERNEL);
 122         if (!rrb)
 123                 return -ENOMEM;
 124
 125         memset(rrb, 0, sizeof(*rrb));
 126         rrb->request.hdr.len = sizeof(rrb->request);
 127         rrb->request.hdr.cmd = CLP_QUERY_PCI_FNGRP;
 128         rrb->response.hdr.len = sizeof(rrb->response);
 129         rrb->request.pfgid = pfgid;
 130
 131         rc = clp_req(rrb, CLP_LPS_PCI);
 132         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
 133                 clp_store_query_pci_fngrp(zdev, &rrb->response);
 134         else {
 135                 zpci_err("Q PCI FGRP:\n");
 136                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 137                 rc = -EIO;
 138         }
 139         clp_free_block(rrb);
 140         return rc;
 141 }
 142
 143 static int clp_store_query_pci_fn(struct zpci_dev *zdev,
 144                                   struct clp_rsp_query_pci *response)
 145 {
 146         int i;
 147
 148         for (i = 0; i < PCI_BAR_COUNT; i++) {
 149                 zdev->bars[i].val = le32_to_cpu(response->bar[i]);
 150                 zdev->bars[i].size = response->bar_size[i];
 151         }
 152         zdev->start_dma = response->sdma;
 153         zdev->end_dma = response->edma;
 154         zdev->pchid = response->pchid;
 155         zdev->pfgid = response->pfgid;
 156         zdev->pft = response->pft;
 157         zdev->vfn = response->vfn;
 158         zdev->uid = response->uid;
 159         zdev->fmb_length = sizeof(u32) * response->fmb_len;
 160
 161         memcpy(zdev->pfip, response->pfip, sizeof(zdev->pfip));
 162         if (response->util_str_avail) {
 163                 memcpy(zdev->util_str, response->util_str,
 164                        sizeof(zdev->util_str));
 165         }
 166         zdev->mio_capable = response->mio_addr_avail;
 167         for (i = 0; i < PCI_BAR_COUNT; i++) {
 168                 if (!(response->mio.valid & (1 << (PCI_BAR_COUNT - i - 1))))
 169                         continue;
 170
 171                 zdev->bars[i].mio_wb = (void __iomem *) response->mio.addr[i].wb;
 172                 zdev->bars[i].mio_wt = (void __iomem *) response->mio.addr[i].wt;
 173         }
 174         return 0;
 175 }
 176
 177 static int clp_query_pci_fn(struct zpci_dev *zdev, u32 fh)
 178 {
 179         struct clp_req_rsp_query_pci *rrb;
 180         int rc;
 181
 182         rrb = clp_alloc_block(GFP_KERNEL);
 183         if (!rrb)
 184                 return -ENOMEM;
 185
 186         memset(rrb, 0, sizeof(*rrb));
 187         rrb->request.hdr.len = sizeof(rrb->request);
 188         rrb->request.hdr.cmd = CLP_QUERY_PCI_FN;
 189         rrb->response.hdr.len = sizeof(rrb->response);
 190         rrb->request.fh = fh;
 191
 192         rc = clp_req(rrb, CLP_LPS_PCI);
 193         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK) {
 194                 rc = clp_store_query_pci_fn(zdev, &rrb->response);
 195                 if (rc)
 196                         goto out;
 197                 rc = clp_query_pci_fngrp(zdev, rrb->response.pfgid);
 198         } else {
 199                 zpci_err("Q PCI FN:\n");
 200                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 201                 rc = -EIO;
 202         }
 203 out:
 204         clp_free_block(rrb);
 205         return rc;
 206 }
 207
 208 int clp_add_pci_device(u32 fid, u32 fh, int configured)
 209 {
 210         struct zpci_dev *zdev;
 211         int rc = -ENOMEM;
 212
 213         zpci_dbg(3, "add fid:%x, fh:%x, c:%d\n", fid, fh, configured);
 214         zdev = kzalloc(sizeof(*zdev), GFP_KERNEL);
 215         if (!zdev)
 216                 goto error;
 217
 218         zdev->fh = fh;
 219         zdev->fid = fid;
 220
 221         /* Query function properties and update zdev */
 222         rc = clp_query_pci_fn(zdev, fh);
 223         if (rc)
 224                 goto error;
 225
 226         if (configured)
 227                 zdev->state = ZPCI_FN_STATE_CONFIGURED;
 228         else
 229                 zdev->state = ZPCI_FN_STATE_STANDBY;
 230
 231         rc = zpci_create_device(zdev);
 232         if (rc)
 233                 goto error;
 234         return 0;
 235
 236 error:
 237         zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
 238         kfree(zdev);
 239         return rc;
 240 }
 241
 242 /*
 243  * Enable/Disable a given PCI function defined by its function handle.
 244  */
 245 static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
 246 {
 247         struct clp_req_rsp_set_pci *rrb;
 248         int rc, retries = 100;
 249
 250         rrb = clp_alloc_block(GFP_KERNEL);
 251         if (!rrb)
 252                 return -ENOMEM;
 253
 254         do {
 255                 memset(rrb, 0, sizeof(*rrb));
 256                 rrb->request.hdr.len = sizeof(rrb->request);
 257                 rrb->request.hdr.cmd = CLP_SET_PCI_FN;
 258                 rrb->response.hdr.len = sizeof(rrb->response);
 259                 rrb->request.fh = *fh;
 260                 rrb->request.oc = command;
 261                 rrb->request.ndas = nr_dma_as;
 262
 263                 rc = clp_req(rrb, CLP_LPS_PCI);
 264                 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
 265                         retries--;
 266                         if (retries < 0)
 267                                 break;
 268                         msleep(20);
 269                 }
 270         } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
 271
 272         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
 273                 *fh = rrb->response.fh;
 274         else {
 275                 zpci_err("Set PCI FN:\n");
 276                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 277                 rc = -EIO;
 278         }
 279         clp_free_block(rrb);
 280         return rc;
 281 }
 282
 283 int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
 284 {
 285         u32 fh = zdev->fh;
 286         int rc;
 287
 288         rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
 289         zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
 290         if (rc)
 291                 goto out;
 292
 293         zdev->fh = fh;
 294         if (zpci_use_mio(zdev)) {
 295                 rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_MIO);
 296                 zpci_dbg(3, "ena mio fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
 297                 if (rc)
 298                         clp_disable_fh(zdev);
 299         }
 300 out:
 301         return rc;
 302 }
 303
 304 int clp_disable_fh(struct zpci_dev *zdev)
 305 {
 306         u32 fh = zdev->fh;
 307         int rc;
 308
 309         if (!zdev_enabled(zdev))
 310                 return 0;
 311
 312         rc = clp_set_pci_fn(&fh, 0, CLP_SET_DISABLE_PCI_FN);
 313         zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, fh, rc);
 314         if (!rc)
 315                 zdev->fh = fh;
 316
 317         return rc;
 318 }
 319
 320 static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
 321                         void (*cb)(struct clp_fh_list_entry *, void *))
 322 {
 323         u64 resume_token = 0;
 324         int entries, i, rc;
 325
 326         do {
 327                 memset(rrb, 0, sizeof(*rrb));
 328                 rrb->request.hdr.len = sizeof(rrb->request);
 329                 rrb->request.hdr.cmd = CLP_LIST_PCI;
 330                 /* store as many entries as possible */
 331                 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
 332                 rrb->request.resume_token = resume_token;
 333
 334                 /* Get PCI function handle list */
 335                 rc = clp_req(rrb, CLP_LPS_PCI);
 336                 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
 337                         zpci_err("List PCI FN:\n");
 338                         zpci_err_clp(rrb->response.hdr.rsp, rc);
 339                         rc = -EIO;
 340                         goto out;
 341                 }
 342
 343                 update_uid_checking(rrb->response.uid_checking);
 344                 WARN_ON_ONCE(rrb->response.entry_size !=
 345                         sizeof(struct clp_fh_list_entry));
 346
 347                 entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
 348                         rrb->response.entry_size;
 349
 350                 resume_token = rrb->response.resume_token;
 351                 for (i = 0; i < entries; i++)
 352                         cb(&rrb->response.fh_list[i], data);
 353         } while (resume_token);
 354 out:
 355         return rc;
 356 }
 357
 358 static void __clp_add(struct clp_fh_list_entry *entry, void *data)
 359 {
 360         struct zpci_dev *zdev;
 361
 362         if (!entry->vendor_id)
 363                 return;
 364
 365         zdev = get_zdev_by_fid(entry->fid);
 366         if (!zdev)
 367                 clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
 368 }
 369
 370 static void __clp_update(struct clp_fh_list_entry *entry, void *data)
 371 {
 372         struct zpci_dev *zdev;
 373
 374         if (!entry->vendor_id)
 375                 return;
 376
 377         zdev = get_zdev_by_fid(entry->fid);
 378         if (!zdev)
 379                 return;
 380
 381         zdev->fh = entry->fh;
 382 }
 383
 384 int clp_scan_pci_devices(void)
 385 {
 386         struct clp_req_rsp_list_pci *rrb;
 387         int rc;
 388
 389         rrb = clp_alloc_block(GFP_KERNEL);
 390         if (!rrb)
 391                 return -ENOMEM;
 392
 393         rc = clp_list_pci(rrb, NULL, __clp_add);
 394
 395         clp_free_block(rrb);
 396         return rc;
 397 }
 398
 399 int clp_rescan_pci_devices(void)
 400 {
 401         struct clp_req_rsp_list_pci *rrb;
 402         int rc;
 403
 404         zpci_remove_reserved_devices();
 405
 406         rrb = clp_alloc_block(GFP_KERNEL);
 407         if (!rrb)
 408                 return -ENOMEM;
 409
 410         rc = clp_list_pci(rrb, NULL, __clp_add);
 411
 412         clp_free_block(rrb);
 413         return rc;
 414 }
 415
 416 int clp_rescan_pci_devices_simple(void)
 417 {
 418         struct clp_req_rsp_list_pci *rrb;
 419         int rc;
 420
 421         rrb = clp_alloc_block(GFP_NOWAIT);
 422         if (!rrb)
 423                 return -ENOMEM;
 424
 425         rc = clp_list_pci(rrb, NULL, __clp_update);
 426
 427         clp_free_block(rrb);
 428         return rc;
 429 }
 430
 431 struct clp_state_data {
 432         u32 fid;
 433         enum zpci_state state;
 434 };
 435
 436 static void __clp_get_state(struct clp_fh_list_entry *entry, void *data)
 437 {
 438         struct clp_state_data *sd = data;
 439
 440         if (entry->fid != sd->fid)
 441                 return;
 442
 443         sd->state = entry->config_state;
 444 }
 445
 446 int clp_get_state(u32 fid, enum zpci_state *state)
 447 {
 448         struct clp_req_rsp_list_pci *rrb;
 449         struct clp_state_data sd = {fid, ZPCI_FN_STATE_RESERVED};
 450         int rc;
 451
 452         rrb = clp_alloc_block(GFP_ATOMIC);
 453         if (!rrb)
 454                 return -ENOMEM;
 455
 456         rc = clp_list_pci(rrb, &sd, __clp_get_state);
 457         if (!rc)
 458                 *state = sd.state;
 459
 460         clp_free_block(rrb);
 461         return rc;
 462 }
 463
 464 static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
 465 {
 466         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 467
 468         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 469             lpcb->response.hdr.len > limit)
 470                 return -EINVAL;
 471         return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
 472 }
 473
 474 static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
 475 {
 476         switch (lpcb->cmd) {
 477         case 0x0001: /* store logical-processor characteristics */
 478                 return clp_base_slpc(req, (void *) lpcb);
 479         default:
 480                 return -EINVAL;
 481         }
 482 }
 483
 484 static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
 485 {
 486         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 487
 488         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 489             lpcb->response.hdr.len > limit)
 490                 return -EINVAL;
 491         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 492 }
 493
 494 static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
 495 {
 496         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 497
 498         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 499             lpcb->response.hdr.len > limit)
 500                 return -EINVAL;
 501         if (lpcb->request.reserved2 != 0)
 502                 return -EINVAL;
 503         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 504 }
 505
 506 static int clp_pci_query(struct clp_req *req,
 507                          struct clp_req_rsp_query_pci *lpcb)
 508 {
 509         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 510
 511         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 512             lpcb->response.hdr.len > limit)
 513                 return -EINVAL;
 514         if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
 515                 return -EINVAL;
 516         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 517 }
 518
 519 static int clp_pci_query_grp(struct clp_req *req,
 520                              struct clp_req_rsp_query_pci_grp *lpcb)
 521 {
 522         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 523
 524         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 525             lpcb->response.hdr.len > limit)
 526                 return -EINVAL;
 527         if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
 528             lpcb->request.reserved4 != 0)
 529                 return -EINVAL;
 530         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 531 }
 532
 533 static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
 534 {
 535         switch (lpcb->cmd) {
 536         case 0x0001: /* store logical-processor characteristics */
 537                 return clp_pci_slpc(req, (void *) lpcb);
 538         case 0x0002: /* list PCI functions */
 539                 return clp_pci_list(req, (void *) lpcb);
 540         case 0x0003: /* query PCI function */
 541                 return clp_pci_query(req, (void *) lpcb);
 542         case 0x0004: /* query PCI function group */
 543                 return clp_pci_query_grp(req, (void *) lpcb);
 544         default:
 545                 return -EINVAL;
 546         }
 547 }
 548
 549 static int clp_normal_command(struct clp_req *req)
 550 {
 551         struct clp_req_hdr *lpcb;
 552         void __user *uptr;
 553         int rc;
 554
 555         rc = -EINVAL;
 556         if (req->lps != 0 && req->lps != 2)
 557                 goto out;
 558
 559         rc = -ENOMEM;
 560         lpcb = clp_alloc_block(GFP_KERNEL);
 561         if (!lpcb)
 562                 goto out;
 563
 564         rc = -EFAULT;
 565         uptr = (void __force __user *)(unsigned long) req->data_p;
 566         if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
 567                 goto out_free;
 568
 569         rc = -EINVAL;
 570         if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
 571                 goto out_free;
 572
 573         switch (req->lps) {
 574         case 0:
 575                 rc = clp_base_command(req, lpcb);
 576                 break;
 577         case 2:
 578                 rc = clp_pci_command(req, lpcb);
 579                 break;
 580         }
 581         if (rc)
 582                 goto out_free;
 583
 584         rc = -EFAULT;
 585         if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
 586                 goto out_free;
 587
 588         rc = 0;
 589
 590 out_free:
 591         clp_free_block(lpcb);
 592 out:
 593         return rc;
 594 }
 595
 596 static int clp_immediate_command(struct clp_req *req)
 597 {
 598         void __user *uptr;
 599         unsigned long ilp;
 600         int exists;
 601
 602         if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
 603                 return -EINVAL;
 604
 605         uptr = (void __force __user *)(unsigned long) req->data_p;
 606         if (req->cmd == 0) {
 607                 /* Command code 0: test for a specific processor */
 608                 exists = test_bit_inv(req->lps, &ilp);
 609                 return put_user(exists, (int __user *) uptr);
 610         }
 611         /* Command code 1: return bit mask of installed processors */
 612         return put_user(ilp, (unsigned long __user *) uptr);
 613 }
 614
 615 static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
 616                            unsigned long arg)
 617 {
 618         struct clp_req req;
 619         void __user *argp;
 620
 621         if (cmd != CLP_SYNC)
 622                 return -EINVAL;
 623
 624         argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
 625         if (copy_from_user(&req, argp, sizeof(req)))
 626                 return -EFAULT;
 627         if (req.r != 0)
 628                 return -EINVAL;
 629         return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
 630 }
 631
 632 static int clp_misc_release(struct inode *inode, struct file *filp)
 633 {
 634         return 0;
 635 }
 636
 637 static const struct file_operations clp_misc_fops = {
 638         .owner = THIS_MODULE,
 639         .open = nonseekable_open,
 640         .release = clp_misc_release,
 641         .unlocked_ioctl = clp_misc_ioctl,
 642         .compat_ioctl = clp_misc_ioctl,
 643         .llseek = no_llseek,
 644 };
 645
 646 static struct miscdevice clp_misc_device = {
 647         .minor = MISC_DYNAMIC_MINOR,
 648         .name = "clp",
 649         .fops = &clp_misc_fops,
 650 };
 651
 652 static int __init clp_misc_init(void)
 653 {
 654         return misc_register(&clp_misc_device);
 655 }
 656
 657 device_initcall(clp_misc_init);