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 = -ENOMEM;
 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                 goto error;
 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         zpci_dbg(0, "add fid:%x, rc:%d\n", fid, rc);
 223         kfree(zdev);
 224         return rc;
 225 }
 226
 227 /*
 228  * Enable/Disable a given PCI function defined by its function handle.
 229  */
 230 static int clp_set_pci_fn(u32 *fh, u8 nr_dma_as, u8 command)
 231 {
 232         struct clp_req_rsp_set_pci *rrb;
 233         int rc, retries = 100;
 234
 235         rrb = clp_alloc_block(GFP_KERNEL);
 236         if (!rrb)
 237                 return -ENOMEM;
 238
 239         do {
 240                 memset(rrb, 0, sizeof(*rrb));
 241                 rrb->request.hdr.len = sizeof(rrb->request);
 242                 rrb->request.hdr.cmd = CLP_SET_PCI_FN;
 243                 rrb->response.hdr.len = sizeof(rrb->response);
 244                 rrb->request.fh = *fh;
 245                 rrb->request.oc = command;
 246                 rrb->request.ndas = nr_dma_as;
 247
 248                 rc = clp_req(rrb, CLP_LPS_PCI);
 249                 if (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY) {
 250                         retries--;
 251                         if (retries < 0)
 252                                 break;
 253                         msleep(20);
 254                 }
 255         } while (rrb->response.hdr.rsp == CLP_RC_SETPCIFN_BUSY);
 256
 257         if (!rc && rrb->response.hdr.rsp == CLP_RC_OK)
 258                 *fh = rrb->response.fh;
 259         else {
 260                 zpci_err("Set PCI FN:\n");
 261                 zpci_err_clp(rrb->response.hdr.rsp, rc);
 262                 rc = -EIO;
 263         }
 264         clp_free_block(rrb);
 265         return rc;
 266 }
 267
 268 int clp_enable_fh(struct zpci_dev *zdev, u8 nr_dma_as)
 269 {
 270         u32 fh = zdev->fh;
 271         int rc;
 272
 273         rc = clp_set_pci_fn(&fh, nr_dma_as, CLP_SET_ENABLE_PCI_FN);
 274         if (!rc)
 275                 /* Success -> store enabled handle in zdev */
 276                 zdev->fh = fh;
 277
 278         zpci_dbg(3, "ena fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
 279         return rc;
 280 }
 281
 282 int clp_disable_fh(struct zpci_dev *zdev)
 283 {
 284         u32 fh = zdev->fh;
 285         int rc;
 286
 287         if (!zdev_enabled(zdev))
 288                 return 0;
 289
 290         rc = clp_set_pci_fn(&fh, 0, CLP_SET_DISABLE_PCI_FN);
 291         if (!rc)
 292                 /* Success -> store disabled handle in zdev */
 293                 zdev->fh = fh;
 294
 295         zpci_dbg(3, "dis fid:%x, fh:%x, rc:%d\n", zdev->fid, zdev->fh, rc);
 296         return rc;
 297 }
 298
 299 static int clp_list_pci(struct clp_req_rsp_list_pci *rrb, void *data,
 300                         void (*cb)(struct clp_fh_list_entry *, void *))
 301 {
 302         u64 resume_token = 0;
 303         int entries, i, rc;
 304
 305         do {
 306                 memset(rrb, 0, sizeof(*rrb));
 307                 rrb->request.hdr.len = sizeof(rrb->request);
 308                 rrb->request.hdr.cmd = CLP_LIST_PCI;
 309                 /* store as many entries as possible */
 310                 rrb->response.hdr.len = CLP_BLK_SIZE - LIST_PCI_HDR_LEN;
 311                 rrb->request.resume_token = resume_token;
 312
 313                 /* Get PCI function handle list */
 314                 rc = clp_req(rrb, CLP_LPS_PCI);
 315                 if (rc || rrb->response.hdr.rsp != CLP_RC_OK) {
 316                         zpci_err("List PCI FN:\n");
 317                         zpci_err_clp(rrb->response.hdr.rsp, rc);
 318                         rc = -EIO;
 319                         goto out;
 320                 }
 321
 322                 zpci_unique_uid = rrb->response.uid_checking;
 323                 WARN_ON_ONCE(rrb->response.entry_size !=
 324                         sizeof(struct clp_fh_list_entry));
 325
 326                 entries = (rrb->response.hdr.len - LIST_PCI_HDR_LEN) /
 327                         rrb->response.entry_size;
 328
 329                 resume_token = rrb->response.resume_token;
 330                 for (i = 0; i < entries; i++)
 331                         cb(&rrb->response.fh_list[i], data);
 332         } while (resume_token);
 333 out:
 334         return rc;
 335 }
 336
 337 static void __clp_add(struct clp_fh_list_entry *entry, void *data)
 338 {
 339         struct zpci_dev *zdev;
 340
 341         if (!entry->vendor_id)
 342                 return;
 343
 344         zdev = get_zdev_by_fid(entry->fid);
 345         if (!zdev)
 346                 clp_add_pci_device(entry->fid, entry->fh, entry->config_state);
 347 }
 348
 349 static void __clp_update(struct clp_fh_list_entry *entry, void *data)
 350 {
 351         struct zpci_dev *zdev;
 352
 353         if (!entry->vendor_id)
 354                 return;
 355
 356         zdev = get_zdev_by_fid(entry->fid);
 357         if (!zdev)
 358                 return;
 359
 360         zdev->fh = entry->fh;
 361 }
 362
 363 int clp_scan_pci_devices(void)
 364 {
 365         struct clp_req_rsp_list_pci *rrb;
 366         int rc;
 367
 368         rrb = clp_alloc_block(GFP_KERNEL);
 369         if (!rrb)
 370                 return -ENOMEM;
 371
 372         rc = clp_list_pci(rrb, NULL, __clp_add);
 373
 374         clp_free_block(rrb);
 375         return rc;
 376 }
 377
 378 int clp_rescan_pci_devices(void)
 379 {
 380         struct clp_req_rsp_list_pci *rrb;
 381         int rc;
 382
 383         zpci_remove_reserved_devices();
 384
 385         rrb = clp_alloc_block(GFP_KERNEL);
 386         if (!rrb)
 387                 return -ENOMEM;
 388
 389         rc = clp_list_pci(rrb, NULL, __clp_add);
 390
 391         clp_free_block(rrb);
 392         return rc;
 393 }
 394
 395 int clp_rescan_pci_devices_simple(void)
 396 {
 397         struct clp_req_rsp_list_pci *rrb;
 398         int rc;
 399
 400         rrb = clp_alloc_block(GFP_NOWAIT);
 401         if (!rrb)
 402                 return -ENOMEM;
 403
 404         rc = clp_list_pci(rrb, NULL, __clp_update);
 405
 406         clp_free_block(rrb);
 407         return rc;
 408 }
 409
 410 struct clp_state_data {
 411         u32 fid;
 412         enum zpci_state state;
 413 };
 414
 415 static void __clp_get_state(struct clp_fh_list_entry *entry, void *data)
 416 {
 417         struct clp_state_data *sd = data;
 418
 419         if (entry->fid != sd->fid)
 420                 return;
 421
 422         sd->state = entry->config_state;
 423 }
 424
 425 int clp_get_state(u32 fid, enum zpci_state *state)
 426 {
 427         struct clp_req_rsp_list_pci *rrb;
 428         struct clp_state_data sd = {fid, ZPCI_FN_STATE_RESERVED};
 429         int rc;
 430
 431         rrb = clp_alloc_block(GFP_KERNEL);
 432         if (!rrb)
 433                 return -ENOMEM;
 434
 435         rc = clp_list_pci(rrb, &sd, __clp_get_state);
 436         if (!rc)
 437                 *state = sd.state;
 438
 439         clp_free_block(rrb);
 440         return rc;
 441 }
 442
 443 static int clp_base_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
 444 {
 445         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 446
 447         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 448             lpcb->response.hdr.len > limit)
 449                 return -EINVAL;
 450         return clp_req(lpcb, CLP_LPS_BASE) ? -EOPNOTSUPP : 0;
 451 }
 452
 453 static int clp_base_command(struct clp_req *req, struct clp_req_hdr *lpcb)
 454 {
 455         switch (lpcb->cmd) {
 456         case 0x0001: /* store logical-processor characteristics */
 457                 return clp_base_slpc(req, (void *) lpcb);
 458         default:
 459                 return -EINVAL;
 460         }
 461 }
 462
 463 static int clp_pci_slpc(struct clp_req *req, struct clp_req_rsp_slpc *lpcb)
 464 {
 465         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 466
 467         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 468             lpcb->response.hdr.len > limit)
 469                 return -EINVAL;
 470         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 471 }
 472
 473 static int clp_pci_list(struct clp_req *req, struct clp_req_rsp_list_pci *lpcb)
 474 {
 475         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 476
 477         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 478             lpcb->response.hdr.len > limit)
 479                 return -EINVAL;
 480         if (lpcb->request.reserved2 != 0)
 481                 return -EINVAL;
 482         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 483 }
 484
 485 static int clp_pci_query(struct clp_req *req,
 486                          struct clp_req_rsp_query_pci *lpcb)
 487 {
 488         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 489
 490         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 491             lpcb->response.hdr.len > limit)
 492                 return -EINVAL;
 493         if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0)
 494                 return -EINVAL;
 495         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 496 }
 497
 498 static int clp_pci_query_grp(struct clp_req *req,
 499                              struct clp_req_rsp_query_pci_grp *lpcb)
 500 {
 501         unsigned long limit = PAGE_SIZE - sizeof(lpcb->request);
 502
 503         if (lpcb->request.hdr.len != sizeof(lpcb->request) ||
 504             lpcb->response.hdr.len > limit)
 505                 return -EINVAL;
 506         if (lpcb->request.reserved2 != 0 || lpcb->request.reserved3 != 0 ||
 507             lpcb->request.reserved4 != 0)
 508                 return -EINVAL;
 509         return clp_req(lpcb, CLP_LPS_PCI) ? -EOPNOTSUPP : 0;
 510 }
 511
 512 static int clp_pci_command(struct clp_req *req, struct clp_req_hdr *lpcb)
 513 {
 514         switch (lpcb->cmd) {
 515         case 0x0001: /* store logical-processor characteristics */
 516                 return clp_pci_slpc(req, (void *) lpcb);
 517         case 0x0002: /* list PCI functions */
 518                 return clp_pci_list(req, (void *) lpcb);
 519         case 0x0003: /* query PCI function */
 520                 return clp_pci_query(req, (void *) lpcb);
 521         case 0x0004: /* query PCI function group */
 522                 return clp_pci_query_grp(req, (void *) lpcb);
 523         default:
 524                 return -EINVAL;
 525         }
 526 }
 527
 528 static int clp_normal_command(struct clp_req *req)
 529 {
 530         struct clp_req_hdr *lpcb;
 531         void __user *uptr;
 532         int rc;
 533
 534         rc = -EINVAL;
 535         if (req->lps != 0 && req->lps != 2)
 536                 goto out;
 537
 538         rc = -ENOMEM;
 539         lpcb = clp_alloc_block(GFP_KERNEL);
 540         if (!lpcb)
 541                 goto out;
 542
 543         rc = -EFAULT;
 544         uptr = (void __force __user *)(unsigned long) req->data_p;
 545         if (copy_from_user(lpcb, uptr, PAGE_SIZE) != 0)
 546                 goto out_free;
 547
 548         rc = -EINVAL;
 549         if (lpcb->fmt != 0 || lpcb->reserved1 != 0 || lpcb->reserved2 != 0)
 550                 goto out_free;
 551
 552         switch (req->lps) {
 553         case 0:
 554                 rc = clp_base_command(req, lpcb);
 555                 break;
 556         case 2:
 557                 rc = clp_pci_command(req, lpcb);
 558                 break;
 559         }
 560         if (rc)
 561                 goto out_free;
 562
 563         rc = -EFAULT;
 564         if (copy_to_user(uptr, lpcb, PAGE_SIZE) != 0)
 565                 goto out_free;
 566
 567         rc = 0;
 568
 569 out_free:
 570         clp_free_block(lpcb);
 571 out:
 572         return rc;
 573 }
 574
 575 static int clp_immediate_command(struct clp_req *req)
 576 {
 577         void __user *uptr;
 578         unsigned long ilp;
 579         int exists;
 580
 581         if (req->cmd > 1 || clp_get_ilp(&ilp) != 0)
 582                 return -EINVAL;
 583
 584         uptr = (void __force __user *)(unsigned long) req->data_p;
 585         if (req->cmd == 0) {
 586                 /* Command code 0: test for a specific processor */
 587                 exists = test_bit_inv(req->lps, &ilp);
 588                 return put_user(exists, (int __user *) uptr);
 589         }
 590         /* Command code 1: return bit mask of installed processors */
 591         return put_user(ilp, (unsigned long __user *) uptr);
 592 }
 593
 594 static long clp_misc_ioctl(struct file *filp, unsigned int cmd,
 595                            unsigned long arg)
 596 {
 597         struct clp_req req;
 598         void __user *argp;
 599
 600         if (cmd != CLP_SYNC)
 601                 return -EINVAL;
 602
 603         argp = is_compat_task() ? compat_ptr(arg) : (void __user *) arg;
 604         if (copy_from_user(&req, argp, sizeof(req)))
 605                 return -EFAULT;
 606         if (req.r != 0)
 607                 return -EINVAL;
 608         return req.c ? clp_immediate_command(&req) : clp_normal_command(&req);
 609 }
 610
 611 static int clp_misc_release(struct inode *inode, struct file *filp)
 612 {
 613         return 0;
 614 }
 615
 616 static const struct file_operations clp_misc_fops = {
 617         .owner = THIS_MODULE,
 618         .open = nonseekable_open,
 619         .release = clp_misc_release,
 620         .unlocked_ioctl = clp_misc_ioctl,
 621         .compat_ioctl = clp_misc_ioctl,
 622         .llseek = no_llseek,
 623 };
 624
 625 static struct miscdevice clp_misc_device = {
 626         .minor = MISC_DYNAMIC_MINOR,
 627         .name = "clp",
 628         .fops = &clp_misc_fops,
 629 };
 630
 631 static int __init clp_misc_init(void)
 632 {
 633         return misc_register(&clp_misc_device);
 634 }
 635
 636 device_initcall(clp_misc_init);