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