drivers/pci/vpd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * PCI VPD support
   4  *
   5  * Copyright (C) 2010 Broadcom Corporation.
   6  */
   7
   8 #include <linux/pci.h>
   9 #include <linux/delay.h>
  10 #include <linux/export.h>
  11 #include <linux/sched/signal.h>
  12 #include <linux/unaligned.h>
  13 #include "pci.h"
  14
  15 #define PCI_VPD_LRDT_TAG_SIZE           3
  16 #define PCI_VPD_SRDT_LEN_MASK           0x07
  17 #define PCI_VPD_SRDT_TAG_SIZE           1
  18 #define PCI_VPD_STIN_END                0x0f
  19 #define PCI_VPD_INFO_FLD_HDR_SIZE       3
  20
  21 static u16 pci_vpd_lrdt_size(const u8 *lrdt)
  22 {
  23         return get_unaligned_le16(lrdt + 1);
  24 }
  25
  26 static u8 pci_vpd_srdt_tag(const u8 *srdt)
  27 {
  28         return *srdt >> 3;
  29 }
  30
  31 static u8 pci_vpd_srdt_size(const u8 *srdt)
  32 {
  33         return *srdt & PCI_VPD_SRDT_LEN_MASK;
  34 }
  35
  36 static u8 pci_vpd_info_field_size(const u8 *info_field)
  37 {
  38         return info_field[2];
  39 }
  40
  41 /* VPD access through PCI 2.2+ VPD capability */
  42
  43 static struct pci_dev *pci_get_func0_dev(struct pci_dev *dev)
  44 {
  45         return pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
  46 }
  47
  48 #define PCI_VPD_MAX_SIZE        (PCI_VPD_ADDR_MASK + 1)
  49 #define PCI_VPD_SZ_INVALID      UINT_MAX
  50
  51 /**
  52  * pci_vpd_size - determine actual size of Vital Product Data
  53  * @dev:        pci device struct
  54  */
  55 static size_t pci_vpd_size(struct pci_dev *dev)
  56 {
  57         size_t off = 0, size;
  58         unsigned char tag, header[1+2]; /* 1 byte tag, 2 bytes length */
  59
  60         while (pci_read_vpd_any(dev, off, 1, header) == 1) {
  61                 size = 0;
  62
  63                 if (off == 0 && (header[0] == 0x00 || header[0] == 0xff))
  64                         goto error;
  65
  66                 if (header[0] & PCI_VPD_LRDT) {
  67                         /* Large Resource Data Type Tag */
  68                         if (pci_read_vpd_any(dev, off + 1, 2, &header[1]) != 2) {
  69                                 pci_warn(dev, "failed VPD read at offset %zu\n",
  70                                          off + 1);
  71                                 return off ?: PCI_VPD_SZ_INVALID;
  72                         }
  73                         size = pci_vpd_lrdt_size(header);
  74                         if (off + size > PCI_VPD_MAX_SIZE)
  75                                 goto error;
  76
  77                         off += PCI_VPD_LRDT_TAG_SIZE + size;
  78                 } else {
  79                         /* Short Resource Data Type Tag */
  80                         tag = pci_vpd_srdt_tag(header);
  81                         size = pci_vpd_srdt_size(header);
  82                         if (off + size > PCI_VPD_MAX_SIZE)
  83                                 goto error;
  84
  85                         off += PCI_VPD_SRDT_TAG_SIZE + size;
  86                         if (tag == PCI_VPD_STIN_END)    /* End tag descriptor */
  87                                 return off;
  88                 }
  89         }
  90         return off;
  91
  92 error:
  93         pci_info(dev, "invalid VPD tag %#04x (size %zu) at offset %zu%s\n",
  94                  header[0], size, off, off == 0 ?
  95                  "; assume missing optional EEPROM" : "");
  96         return off ?: PCI_VPD_SZ_INVALID;
  97 }
  98
  99 static bool pci_vpd_available(struct pci_dev *dev, bool check_size)
 100 {
 101         struct pci_vpd *vpd = &dev->vpd;
 102
 103         if (!vpd->cap)
 104                 return false;
 105
 106         if (vpd->len == 0 && check_size) {
 107                 vpd->len = pci_vpd_size(dev);
 108                 if (vpd->len == PCI_VPD_SZ_INVALID) {
 109                         vpd->cap = 0;
 110                         return false;
 111                 }
 112         }
 113
 114         return true;
 115 }
 116
 117 /*
 118  * Wait for last operation to complete.
 119  * This code has to spin since there is no other notification from the PCI
 120  * hardware. Since the VPD is often implemented by serial attachment to an
 121  * EEPROM, it may take many milliseconds to complete.
 122  * @set: if true wait for flag to be set, else wait for it to be cleared
 123  *
 124  * Returns 0 on success, negative values indicate error.
 125  */
 126 static int pci_vpd_wait(struct pci_dev *dev, bool set)
 127 {
 128         struct pci_vpd *vpd = &dev->vpd;
 129         unsigned long timeout = jiffies + msecs_to_jiffies(125);
 130         unsigned long max_sleep = 16;
 131         u16 status;
 132         int ret;
 133
 134         do {
 135                 ret = pci_user_read_config_word(dev, vpd->cap + PCI_VPD_ADDR,
 136                                                 &status);
 137                 if (ret < 0)
 138                         return ret;
 139
 140                 if (!!(status & PCI_VPD_ADDR_F) == set)
 141                         return 0;
 142
 143                 if (time_after(jiffies, timeout))
 144                         break;
 145
 146                 usleep_range(10, max_sleep);
 147                 if (max_sleep < 1024)
 148                         max_sleep *= 2;
 149         } while (true);
 150
 151         pci_warn(dev, "VPD access failed.  This is likely a firmware bug on this device.  Contact the card vendor for a firmware update\n");
 152         return -ETIMEDOUT;
 153 }
 154
 155 static ssize_t pci_vpd_read(struct pci_dev *dev, loff_t pos, size_t count,
 156                             void *arg, bool check_size)
 157 {
 158         struct pci_vpd *vpd = &dev->vpd;
 159         unsigned int max_len;
 160         int ret = 0;
 161         loff_t end = pos + count;
 162         u8 *buf = arg;
 163
 164         if (!pci_vpd_available(dev, check_size))
 165                 return -ENODEV;
 166
 167         if (pos < 0)
 168                 return -EINVAL;
 169
 170         max_len = check_size ? vpd->len : PCI_VPD_MAX_SIZE;
 171
 172         if (pos >= max_len)
 173                 return 0;
 174
 175         if (end > max_len) {
 176                 end = max_len;
 177                 count = end - pos;
 178         }
 179
 180         if (mutex_lock_killable(&vpd->lock))
 181                 return -EINTR;
 182
 183         while (pos < end) {
 184                 u32 val;
 185                 unsigned int i, skip;
 186
 187                 if (fatal_signal_pending(current)) {
 188                         ret = -EINTR;
 189                         break;
 190                 }
 191
 192                 ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
 193                                                  pos & ~3);
 194                 if (ret < 0)
 195                         break;
 196                 ret = pci_vpd_wait(dev, true);
 197                 if (ret < 0)
 198                         break;
 199
 200                 ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA, &val);
 201                 if (ret < 0)
 202                         break;
 203
 204                 skip = pos & 3;
 205                 for (i = 0;  i < sizeof(u32); i++) {
 206                         if (i >= skip) {
 207                                 *buf++ = val;
 208                                 if (++pos == end)
 209                                         break;
 210                         }
 211                         val >>= 8;
 212                 }
 213         }
 214
 215         mutex_unlock(&vpd->lock);
 216         return ret ? ret : count;
 217 }
 218
 219 static ssize_t pci_vpd_write(struct pci_dev *dev, loff_t pos, size_t count,
 220                              const void *arg, bool check_size)
 221 {
 222         struct pci_vpd *vpd = &dev->vpd;
 223         unsigned int max_len;
 224         const u8 *buf = arg;
 225         loff_t end = pos + count;
 226         int ret = 0;
 227
 228         if (!pci_vpd_available(dev, check_size))
 229                 return -ENODEV;
 230
 231         if (pos < 0 || (pos & 3) || (count & 3))
 232                 return -EINVAL;
 233
 234         max_len = check_size ? vpd->len : PCI_VPD_MAX_SIZE;
 235
 236         if (end > max_len)
 237                 return -EINVAL;
 238
 239         if (mutex_lock_killable(&vpd->lock))
 240                 return -EINTR;
 241
 242         while (pos < end) {
 243                 ret = pci_user_write_config_dword(dev, vpd->cap + PCI_VPD_DATA,
 244                                                   get_unaligned_le32(buf));
 245                 if (ret < 0)
 246                         break;
 247                 ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
 248                                                  pos | PCI_VPD_ADDR_F);
 249                 if (ret < 0)
 250                         break;
 251
 252                 ret = pci_vpd_wait(dev, false);
 253                 if (ret < 0)
 254                         break;
 255
 256                 buf += sizeof(u32);
 257                 pos += sizeof(u32);
 258         }
 259
 260         mutex_unlock(&vpd->lock);
 261         return ret ? ret : count;
 262 }
 263
 264 void pci_vpd_init(struct pci_dev *dev)
 265 {
 266         if (dev->vpd.len == PCI_VPD_SZ_INVALID)
 267                 return;
 268
 269         dev->vpd.cap = pci_find_capability(dev, PCI_CAP_ID_VPD);
 270         mutex_init(&dev->vpd.lock);
 271 }
 272
 273 static ssize_t vpd_read(struct file *filp, struct kobject *kobj,
 274                         struct bin_attribute *bin_attr, char *buf, loff_t off,
 275                         size_t count)
 276 {
 277         struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
 278         struct pci_dev *vpd_dev = dev;
 279         ssize_t ret;
 280
 281         if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0) {
 282                 vpd_dev = pci_get_func0_dev(dev);
 283                 if (!vpd_dev)
 284                         return -ENODEV;
 285         }
 286
 287         pci_config_pm_runtime_get(vpd_dev);
 288         ret = pci_read_vpd(vpd_dev, off, count, buf);
 289         pci_config_pm_runtime_put(vpd_dev);
 290
 291         if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0)
 292                 pci_dev_put(vpd_dev);
 293
 294         return ret;
 295 }
 296
 297 static ssize_t vpd_write(struct file *filp, struct kobject *kobj,
 298                          struct bin_attribute *bin_attr, char *buf, loff_t off,
 299                          size_t count)
 300 {
 301         struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
 302         struct pci_dev *vpd_dev = dev;
 303         ssize_t ret;
 304
 305         if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0) {
 306                 vpd_dev = pci_get_func0_dev(dev);
 307                 if (!vpd_dev)
 308                         return -ENODEV;
 309         }
 310
 311         pci_config_pm_runtime_get(vpd_dev);
 312         ret = pci_write_vpd(vpd_dev, off, count, buf);
 313         pci_config_pm_runtime_put(vpd_dev);
 314
 315         if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0)
 316                 pci_dev_put(vpd_dev);
 317
 318         return ret;
 319 }
 320 static BIN_ATTR(vpd, 0600, vpd_read, vpd_write, 0);
 321
 322 static struct bin_attribute *vpd_attrs[] = {
 323         &bin_attr_vpd,
 324         NULL,
 325 };
 326
 327 static umode_t vpd_attr_is_visible(struct kobject *kobj,
 328                                    const struct bin_attribute *a, int n)
 329 {
 330         struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
 331
 332         if (!pdev->vpd.cap)
 333                 return 0;
 334
 335         return a->attr.mode;
 336 }
 337
 338 const struct attribute_group pci_dev_vpd_attr_group = {
 339         .bin_attrs = vpd_attrs,
 340         .is_bin_visible = vpd_attr_is_visible,
 341 };
 342
 343 void *pci_vpd_alloc(struct pci_dev *dev, unsigned int *size)
 344 {
 345         unsigned int len;
 346         void *buf;
 347         int cnt;
 348
 349         if (!pci_vpd_available(dev, true))
 350                 return ERR_PTR(-ENODEV);
 351
 352         len = dev->vpd.len;
 353         buf = kmalloc(len, GFP_KERNEL);
 354         if (!buf)
 355                 return ERR_PTR(-ENOMEM);
 356
 357         cnt = pci_read_vpd(dev, 0, len, buf);
 358         if (cnt != len) {
 359                 kfree(buf);
 360                 return ERR_PTR(-EIO);
 361         }
 362
 363         if (size)
 364                 *size = len;
 365
 366         return buf;
 367 }
 368 EXPORT_SYMBOL_GPL(pci_vpd_alloc);
 369
 370 static int pci_vpd_find_tag(const u8 *buf, unsigned int len, u8 rdt, unsigned int *size)
 371 {
 372         int i = 0;
 373
 374         /* look for LRDT tags only, end tag is the only SRDT tag */
 375         while (i + PCI_VPD_LRDT_TAG_SIZE <= len && buf[i] & PCI_VPD_LRDT) {
 376                 unsigned int lrdt_len = pci_vpd_lrdt_size(buf + i);
 377                 u8 tag = buf[i];
 378
 379                 i += PCI_VPD_LRDT_TAG_SIZE;
 380                 if (tag == rdt) {
 381                         if (i + lrdt_len > len)
 382                                 lrdt_len = len - i;
 383                         if (size)
 384                                 *size = lrdt_len;
 385                         return i;
 386                 }
 387
 388                 i += lrdt_len;
 389         }
 390
 391         return -ENOENT;
 392 }
 393
 394 int pci_vpd_find_id_string(const u8 *buf, unsigned int len, unsigned int *size)
 395 {
 396         return pci_vpd_find_tag(buf, len, PCI_VPD_LRDT_ID_STRING, size);
 397 }
 398 EXPORT_SYMBOL_GPL(pci_vpd_find_id_string);
 399
 400 static int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off,
 401                               unsigned int len, const char *kw)
 402 {
 403         int i;
 404
 405         for (i = off; i + PCI_VPD_INFO_FLD_HDR_SIZE <= off + len;) {
 406                 if (buf[i + 0] == kw[0] &&
 407                     buf[i + 1] == kw[1])
 408                         return i;
 409
 410                 i += PCI_VPD_INFO_FLD_HDR_SIZE +
 411                      pci_vpd_info_field_size(&buf[i]);
 412         }
 413
 414         return -ENOENT;
 415 }
 416
 417 static ssize_t __pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf,
 418                               bool check_size)
 419 {
 420         ssize_t ret;
 421
 422         if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0) {
 423                 dev = pci_get_func0_dev(dev);
 424                 if (!dev)
 425                         return -ENODEV;
 426
 427                 ret = pci_vpd_read(dev, pos, count, buf, check_size);
 428                 pci_dev_put(dev);
 429                 return ret;
 430         }
 431
 432         return pci_vpd_read(dev, pos, count, buf, check_size);
 433 }
 434
 435 /**
 436  * pci_read_vpd - Read one entry from Vital Product Data
 437  * @dev:        PCI device struct
 438  * @pos:        offset in VPD space
 439  * @count:      number of bytes to read
 440  * @buf:        pointer to where to store result
 441  */
 442 ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf)
 443 {
 444         return __pci_read_vpd(dev, pos, count, buf, true);
 445 }
 446 EXPORT_SYMBOL(pci_read_vpd);
 447
 448 /* Same, but allow to access any address */
 449 ssize_t pci_read_vpd_any(struct pci_dev *dev, loff_t pos, size_t count, void *buf)
 450 {
 451         return __pci_read_vpd(dev, pos, count, buf, false);
 452 }
 453 EXPORT_SYMBOL(pci_read_vpd_any);
 454
 455 static ssize_t __pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count,
 456                                const void *buf, bool check_size)
 457 {
 458         ssize_t ret;
 459
 460         if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0) {
 461                 dev = pci_get_func0_dev(dev);
 462                 if (!dev)
 463                         return -ENODEV;
 464
 465                 ret = pci_vpd_write(dev, pos, count, buf, check_size);
 466                 pci_dev_put(dev);
 467                 return ret;
 468         }
 469
 470         return pci_vpd_write(dev, pos, count, buf, check_size);
 471 }
 472
 473 /**
 474  * pci_write_vpd - Write entry to Vital Product Data
 475  * @dev:        PCI device struct
 476  * @pos:        offset in VPD space
 477  * @count:      number of bytes to write
 478  * @buf:        buffer containing write data
 479  */
 480 ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf)
 481 {
 482         return __pci_write_vpd(dev, pos, count, buf, true);
 483 }
 484 EXPORT_SYMBOL(pci_write_vpd);
 485
 486 /* Same, but allow to access any address */
 487 ssize_t pci_write_vpd_any(struct pci_dev *dev, loff_t pos, size_t count, const void *buf)
 488 {
 489         return __pci_write_vpd(dev, pos, count, buf, false);
 490 }
 491 EXPORT_SYMBOL(pci_write_vpd_any);
 492
 493 int pci_vpd_find_ro_info_keyword(const void *buf, unsigned int len,
 494                                  const char *kw, unsigned int *size)
 495 {
 496         int ro_start, infokw_start;
 497         unsigned int ro_len, infokw_size;
 498
 499         ro_start = pci_vpd_find_tag(buf, len, PCI_VPD_LRDT_RO_DATA, &ro_len);
 500         if (ro_start < 0)
 501                 return ro_start;
 502
 503         infokw_start = pci_vpd_find_info_keyword(buf, ro_start, ro_len, kw);
 504         if (infokw_start < 0)
 505                 return infokw_start;
 506
 507         infokw_size = pci_vpd_info_field_size(buf + infokw_start);
 508         infokw_start += PCI_VPD_INFO_FLD_HDR_SIZE;
 509
 510         if (infokw_start + infokw_size > len)
 511                 return -EINVAL;
 512
 513         if (size)
 514                 *size = infokw_size;
 515
 516         return infokw_start;
 517 }
 518 EXPORT_SYMBOL_GPL(pci_vpd_find_ro_info_keyword);
 519
 520 int pci_vpd_check_csum(const void *buf, unsigned int len)
 521 {
 522         const u8 *vpd = buf;
 523         unsigned int size;
 524         u8 csum = 0;
 525         int rv_start;
 526
 527         rv_start = pci_vpd_find_ro_info_keyword(buf, len, PCI_VPD_RO_KEYWORD_CHKSUM, &size);
 528         if (rv_start == -ENOENT) /* no checksum in VPD */
 529                 return 1;
 530         else if (rv_start < 0)
 531                 return rv_start;
 532
 533         if (!size)
 534                 return -EINVAL;
 535
 536         while (rv_start >= 0)
 537                 csum += vpd[rv_start--];
 538
 539         return csum ? -EILSEQ : 0;
 540 }
 541 EXPORT_SYMBOL_GPL(pci_vpd_check_csum);
 542
 543 #ifdef CONFIG_PCI_QUIRKS
 544 /*
 545  * Quirk non-zero PCI functions to route VPD access through function 0 for
 546  * devices that share VPD resources between functions.  The functions are
 547  * expected to be identical devices.
 548  */
 549 static void quirk_f0_vpd_link(struct pci_dev *dev)
 550 {
 551         struct pci_dev *f0;
 552
 553         if (!PCI_FUNC(dev->devfn))
 554                 return;
 555
 556         f0 = pci_get_func0_dev(dev);
 557         if (!f0)
 558                 return;
 559
 560         if (f0->vpd.cap && dev->class == f0->class &&
 561             dev->vendor == f0->vendor && dev->device == f0->device)
 562                 dev->dev_flags |= PCI_DEV_FLAGS_VPD_REF_F0;
 563
 564         pci_dev_put(f0);
 565 }
 566 DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_INTEL, PCI_ANY_ID,
 567                               PCI_CLASS_NETWORK_ETHERNET, 8, quirk_f0_vpd_link);
 568
 569 /*
 570  * If a device follows the VPD format spec, the PCI core will not read or
 571  * write past the VPD End Tag.  But some vendors do not follow the VPD
 572  * format spec, so we can't tell how much data is safe to access.  Devices
 573  * may behave unpredictably if we access too much.  Blacklist these devices
 574  * so we don't touch VPD at all.
 575  */
 576 static void quirk_blacklist_vpd(struct pci_dev *dev)
 577 {
 578         dev->vpd.len = PCI_VPD_SZ_INVALID;
 579         pci_warn(dev, FW_BUG "disabling VPD access (can't determine size of non-standard VPD format)\n");
 580 }
 581 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x0060, quirk_blacklist_vpd);
 582 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x007c, quirk_blacklist_vpd);
 583 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x0413, quirk_blacklist_vpd);
 584 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x0078, quirk_blacklist_vpd);
 585 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x0079, quirk_blacklist_vpd);
 586 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x0073, quirk_blacklist_vpd);
 587 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x0071, quirk_blacklist_vpd);
 588 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x005b, quirk_blacklist_vpd);
 589 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x002f, quirk_blacklist_vpd);
 590 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x005d, quirk_blacklist_vpd);
 591 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x005f, quirk_blacklist_vpd);
 592 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATTANSIC, PCI_ANY_ID, quirk_blacklist_vpd);
 593 /*
 594  * The Amazon Annapurna Labs 0x0031 device id is reused for other non Root Port
 595  * device types, so the quirk is registered for the PCI_CLASS_BRIDGE_PCI class.
 596  */
 597 DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031,
 598                                PCI_CLASS_BRIDGE_PCI, 8, quirk_blacklist_vpd);
 599
 600 static void quirk_chelsio_extend_vpd(struct pci_dev *dev)
 601 {
 602         int chip = (dev->device & 0xf000) >> 12;
 603         int func = (dev->device & 0x0f00) >>  8;
 604         int prod = (dev->device & 0x00ff) >>  0;
 605
 606         /*
 607          * If this is a T3-based adapter, there's a 1KB VPD area at offset
 608          * 0xc00 which contains the preferred VPD values.  If this is a T4 or
 609          * later based adapter, the special VPD is at offset 0x400 for the
 610          * Physical Functions (the SR-IOV Virtual Functions have no VPD
 611          * Capabilities).  The PCI VPD Access core routines will normally
 612          * compute the size of the VPD by parsing the VPD Data Structure at
 613          * offset 0x000.  This will result in silent failures when attempting
 614          * to accesses these other VPD areas which are beyond those computed
 615          * limits.
 616          */
 617         if (chip == 0x0 && prod >= 0x20)
 618                 dev->vpd.len = 8192;
 619         else if (chip >= 0x4 && func < 0x8)
 620                 dev->vpd.len = 2048;
 621 }
 622
 623 DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CHELSIO, PCI_ANY_ID,
 624                          quirk_chelsio_extend_vpd);
 625
 626 #endif