1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 2010 Broadcom Corporation.
9 #include <linux/delay.h>
10 #include <linux/export.h>
11 #include <linux/sched/signal.h>
14 /* VPD access through PCI 2.2+ VPD capability */
22 static struct pci_dev *pci_get_func0_dev(struct pci_dev *dev)
24 return pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
27 #define PCI_VPD_MAX_SIZE (PCI_VPD_ADDR_MASK + 1)
28 #define PCI_VPD_SZ_INVALID UINT_MAX
31 * pci_vpd_size - determine actual size of Vital Product Data
32 * @dev: pci device struct
34 static size_t pci_vpd_size(struct pci_dev *dev)
37 unsigned char tag, header[1+2]; /* 1 byte tag, 2 bytes length */
39 /* Otherwise the following reads would fail. */
40 dev->vpd->len = PCI_VPD_MAX_SIZE;
42 while (pci_read_vpd(dev, off, 1, header) == 1) {
45 if (off == 0 && (header[0] == 0x00 || header[0] == 0xff))
48 if (header[0] & PCI_VPD_LRDT) {
49 /* Large Resource Data Type Tag */
50 if (pci_read_vpd(dev, off + 1, 2, &header[1]) != 2) {
51 pci_warn(dev, "failed VPD read at offset %zu\n",
53 return off ?: PCI_VPD_SZ_INVALID;
55 size = pci_vpd_lrdt_size(header);
56 if (off + size > PCI_VPD_MAX_SIZE)
59 off += PCI_VPD_LRDT_TAG_SIZE + size;
61 /* Short Resource Data Type Tag */
62 tag = pci_vpd_srdt_tag(header);
63 size = pci_vpd_srdt_size(header);
64 if (off + size > PCI_VPD_MAX_SIZE)
67 off += PCI_VPD_SRDT_TAG_SIZE + size;
68 if (tag == PCI_VPD_STIN_END) /* End tag descriptor */
75 pci_info(dev, "invalid VPD tag %#04x (size %zu) at offset %zu%s\n",
76 header[0], size, off, off == 0 ?
77 "; assume missing optional EEPROM" : "");
78 return off ?: PCI_VPD_SZ_INVALID;
82 * Wait for last operation to complete.
83 * This code has to spin since there is no other notification from the PCI
84 * hardware. Since the VPD is often implemented by serial attachment to an
85 * EEPROM, it may take many milliseconds to complete.
86 * @set: if true wait for flag to be set, else wait for it to be cleared
88 * Returns 0 on success, negative values indicate error.
90 static int pci_vpd_wait(struct pci_dev *dev, bool set)
92 struct pci_vpd *vpd = dev->vpd;
93 unsigned long timeout = jiffies + msecs_to_jiffies(125);
94 unsigned long max_sleep = 16;
99 ret = pci_user_read_config_word(dev, vpd->cap + PCI_VPD_ADDR,
104 if (!!(status & PCI_VPD_ADDR_F) == set)
107 if (time_after(jiffies, timeout))
110 usleep_range(10, max_sleep);
111 if (max_sleep < 1024)
115 pci_warn(dev, "VPD access failed. This is likely a firmware bug on this device. Contact the card vendor for a firmware update\n");
119 static ssize_t pci_vpd_read(struct pci_dev *dev, loff_t pos, size_t count,
122 struct pci_vpd *vpd = dev->vpd;
124 loff_t end = pos + count;
134 vpd->len = pci_vpd_size(dev);
136 if (vpd->len == PCI_VPD_SZ_INVALID)
142 if (end > vpd->len) {
147 if (mutex_lock_killable(&vpd->lock))
152 unsigned int i, skip;
154 if (fatal_signal_pending(current)) {
159 ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
163 ret = pci_vpd_wait(dev, true);
167 ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA, &val);
172 for (i = 0; i < sizeof(u32); i++) {
182 mutex_unlock(&vpd->lock);
183 return ret ? ret : count;
186 static ssize_t pci_vpd_write(struct pci_dev *dev, loff_t pos, size_t count,
189 struct pci_vpd *vpd = dev->vpd;
191 loff_t end = pos + count;
197 if (pos < 0 || (pos & 3) || (count & 3))
201 vpd->len = pci_vpd_size(dev);
203 if (vpd->len == PCI_VPD_SZ_INVALID)
209 if (mutex_lock_killable(&vpd->lock))
220 ret = pci_user_write_config_dword(dev, vpd->cap + PCI_VPD_DATA, val);
223 ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
224 pos | PCI_VPD_ADDR_F);
228 ret = pci_vpd_wait(dev, false);
235 mutex_unlock(&vpd->lock);
236 return ret ? ret : count;
239 void pci_vpd_init(struct pci_dev *dev)
244 cap = pci_find_capability(dev, PCI_CAP_ID_VPD);
248 vpd = kzalloc(sizeof(*vpd), GFP_ATOMIC);
252 mutex_init(&vpd->lock);
257 void pci_vpd_release(struct pci_dev *dev)
262 static ssize_t vpd_read(struct file *filp, struct kobject *kobj,
263 struct bin_attribute *bin_attr, char *buf, loff_t off,
266 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
268 return pci_read_vpd(dev, off, count, buf);
271 static ssize_t vpd_write(struct file *filp, struct kobject *kobj,
272 struct bin_attribute *bin_attr, char *buf, loff_t off,
275 struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
277 return pci_write_vpd(dev, off, count, buf);
279 static BIN_ATTR(vpd, 0600, vpd_read, vpd_write, 0);
281 static struct bin_attribute *vpd_attrs[] = {
286 static umode_t vpd_attr_is_visible(struct kobject *kobj,
287 struct bin_attribute *a, int n)
289 struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
297 const struct attribute_group pci_dev_vpd_attr_group = {
298 .bin_attrs = vpd_attrs,
299 .is_bin_visible = vpd_attr_is_visible,
302 int pci_vpd_find_tag(const u8 *buf, unsigned int len, u8 rdt)
306 /* look for LRDT tags only, end tag is the only SRDT tag */
307 while (i + PCI_VPD_LRDT_TAG_SIZE <= len && buf[i] & PCI_VPD_LRDT) {
311 i += PCI_VPD_LRDT_TAG_SIZE + pci_vpd_lrdt_size(buf + i);
316 EXPORT_SYMBOL_GPL(pci_vpd_find_tag);
318 int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off,
319 unsigned int len, const char *kw)
323 for (i = off; i + PCI_VPD_INFO_FLD_HDR_SIZE <= off + len;) {
324 if (buf[i + 0] == kw[0] &&
328 i += PCI_VPD_INFO_FLD_HDR_SIZE +
329 pci_vpd_info_field_size(&buf[i]);
334 EXPORT_SYMBOL_GPL(pci_vpd_find_info_keyword);
337 * pci_read_vpd - Read one entry from Vital Product Data
338 * @dev: PCI device struct
339 * @pos: offset in VPD space
340 * @count: number of bytes to read
341 * @buf: pointer to where to store result
343 ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf)
347 if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0) {
348 dev = pci_get_func0_dev(dev);
352 ret = pci_vpd_read(dev, pos, count, buf);
357 return pci_vpd_read(dev, pos, count, buf);
359 EXPORT_SYMBOL(pci_read_vpd);
362 * pci_write_vpd - Write entry to Vital Product Data
363 * @dev: PCI device struct
364 * @pos: offset in VPD space
365 * @count: number of bytes to write
366 * @buf: buffer containing write data
368 ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf)
372 if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0) {
373 dev = pci_get_func0_dev(dev);
377 ret = pci_vpd_write(dev, pos, count, buf);
382 return pci_vpd_write(dev, pos, count, buf);
384 EXPORT_SYMBOL(pci_write_vpd);
386 #ifdef CONFIG_PCI_QUIRKS
388 * Quirk non-zero PCI functions to route VPD access through function 0 for
389 * devices that share VPD resources between functions. The functions are
390 * expected to be identical devices.
392 static void quirk_f0_vpd_link(struct pci_dev *dev)
396 if (!PCI_FUNC(dev->devfn))
399 f0 = pci_get_func0_dev(dev);
403 if (f0->vpd && dev->class == f0->class &&
404 dev->vendor == f0->vendor && dev->device == f0->device)
405 dev->dev_flags |= PCI_DEV_FLAGS_VPD_REF_F0;
409 DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_INTEL, PCI_ANY_ID,
410 PCI_CLASS_NETWORK_ETHERNET, 8, quirk_f0_vpd_link);
413 * If a device follows the VPD format spec, the PCI core will not read or
414 * write past the VPD End Tag. But some vendors do not follow the VPD
415 * format spec, so we can't tell how much data is safe to access. Devices
416 * may behave unpredictably if we access too much. Blacklist these devices
417 * so we don't touch VPD at all.
419 static void quirk_blacklist_vpd(struct pci_dev *dev)
422 dev->vpd->len = PCI_VPD_SZ_INVALID;
423 pci_warn(dev, FW_BUG "disabling VPD access (can't determine size of non-standard VPD format)\n");
426 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0060, quirk_blacklist_vpd);
427 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x007c, quirk_blacklist_vpd);
428 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0413, quirk_blacklist_vpd);
429 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0078, quirk_blacklist_vpd);
430 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0079, quirk_blacklist_vpd);
431 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0073, quirk_blacklist_vpd);
432 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0071, quirk_blacklist_vpd);
433 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x005b, quirk_blacklist_vpd);
434 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x002f, quirk_blacklist_vpd);
435 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x005d, quirk_blacklist_vpd);
436 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x005f, quirk_blacklist_vpd);
437 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATTANSIC, PCI_ANY_ID,
438 quirk_blacklist_vpd);
440 * The Amazon Annapurna Labs 0x0031 device id is reused for other non Root Port
441 * device types, so the quirk is registered for the PCI_CLASS_BRIDGE_PCI class.
443 DECLARE_PCI_FIXUP_CLASS_FINAL(PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031,
444 PCI_CLASS_BRIDGE_PCI, 8, quirk_blacklist_vpd);
446 static void pci_vpd_set_size(struct pci_dev *dev, size_t len)
448 struct pci_vpd *vpd = dev->vpd;
450 if (!vpd || len == 0 || len > PCI_VPD_MAX_SIZE)
456 static void quirk_chelsio_extend_vpd(struct pci_dev *dev)
458 int chip = (dev->device & 0xf000) >> 12;
459 int func = (dev->device & 0x0f00) >> 8;
460 int prod = (dev->device & 0x00ff) >> 0;
463 * If this is a T3-based adapter, there's a 1KB VPD area at offset
464 * 0xc00 which contains the preferred VPD values. If this is a T4 or
465 * later based adapter, the special VPD is at offset 0x400 for the
466 * Physical Functions (the SR-IOV Virtual Functions have no VPD
467 * Capabilities). The PCI VPD Access core routines will normally
468 * compute the size of the VPD by parsing the VPD Data Structure at
469 * offset 0x000. This will result in silent failures when attempting
470 * to accesses these other VPD areas which are beyond those computed
473 if (chip == 0x0 && prod >= 0x20)
474 pci_vpd_set_size(dev, 8192);
475 else if (chip >= 0x4 && func < 0x8)
476 pci_vpd_set_size(dev, 2048);
479 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_CHELSIO, PCI_ANY_ID,
480 quirk_chelsio_extend_vpd);