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567 lines
14 KiB
567 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* PCI VPD support |
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* |
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* Copyright (C) 2010 Broadcom Corporation. |
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*/ |
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|
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#include <linux/pci.h> |
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#include <linux/delay.h> |
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#include <linux/export.h> |
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#include <linux/sched/signal.h> |
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#include <asm/unaligned.h> |
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#include "pci.h" |
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#define PCI_VPD_LRDT_TAG_SIZE 3 |
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#define PCI_VPD_SRDT_LEN_MASK 0x07 |
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#define PCI_VPD_SRDT_TAG_SIZE 1 |
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#define PCI_VPD_STIN_END 0x0f |
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#define PCI_VPD_INFO_FLD_HDR_SIZE 3 |
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static u16 pci_vpd_lrdt_size(const u8 *lrdt) |
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{ |
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return get_unaligned_le16(lrdt + 1); |
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} |
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static u8 pci_vpd_srdt_tag(const u8 *srdt) |
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{ |
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return *srdt >> 3; |
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} |
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static u8 pci_vpd_srdt_size(const u8 *srdt) |
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{ |
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return *srdt & PCI_VPD_SRDT_LEN_MASK; |
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} |
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static u8 pci_vpd_info_field_size(const u8 *info_field) |
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{ |
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return info_field[2]; |
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} |
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/* VPD access through PCI 2.2+ VPD capability */ |
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static struct pci_dev *pci_get_func0_dev(struct pci_dev *dev) |
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{ |
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return pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0)); |
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} |
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#define PCI_VPD_MAX_SIZE (PCI_VPD_ADDR_MASK + 1) |
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#define PCI_VPD_SZ_INVALID UINT_MAX |
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/** |
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* pci_vpd_size - determine actual size of Vital Product Data |
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* @dev: pci device struct |
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*/ |
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static size_t pci_vpd_size(struct pci_dev *dev) |
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{ |
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size_t off = 0, size; |
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unsigned char tag, header[1+2]; /* 1 byte tag, 2 bytes length */ |
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|
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/* Otherwise the following reads would fail. */ |
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dev->vpd.len = PCI_VPD_MAX_SIZE; |
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while (pci_read_vpd(dev, off, 1, header) == 1) { |
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size = 0; |
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if (off == 0 && (header[0] == 0x00 || header[0] == 0xff)) |
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goto error; |
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if (header[0] & PCI_VPD_LRDT) { |
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/* Large Resource Data Type Tag */ |
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if (pci_read_vpd(dev, off + 1, 2, &header[1]) != 2) { |
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pci_warn(dev, "failed VPD read at offset %zu\n", |
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off + 1); |
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return off ?: PCI_VPD_SZ_INVALID; |
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} |
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size = pci_vpd_lrdt_size(header); |
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if (off + size > PCI_VPD_MAX_SIZE) |
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goto error; |
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off += PCI_VPD_LRDT_TAG_SIZE + size; |
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} else { |
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/* Short Resource Data Type Tag */ |
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tag = pci_vpd_srdt_tag(header); |
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size = pci_vpd_srdt_size(header); |
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if (off + size > PCI_VPD_MAX_SIZE) |
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goto error; |
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off += PCI_VPD_SRDT_TAG_SIZE + size; |
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if (tag == PCI_VPD_STIN_END) /* End tag descriptor */ |
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return off; |
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} |
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} |
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return off; |
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error: |
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pci_info(dev, "invalid VPD tag %#04x (size %zu) at offset %zu%s\n", |
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header[0], size, off, off == 0 ? |
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"; assume missing optional EEPROM" : ""); |
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return off ?: PCI_VPD_SZ_INVALID; |
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} |
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static bool pci_vpd_available(struct pci_dev *dev) |
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{ |
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struct pci_vpd *vpd = &dev->vpd; |
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if (!vpd->cap) |
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return false; |
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if (vpd->len == 0) { |
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vpd->len = pci_vpd_size(dev); |
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if (vpd->len == PCI_VPD_SZ_INVALID) { |
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vpd->cap = 0; |
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return false; |
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} |
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} |
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return true; |
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} |
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/* |
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* Wait for last operation to complete. |
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* This code has to spin since there is no other notification from the PCI |
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* hardware. Since the VPD is often implemented by serial attachment to an |
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* EEPROM, it may take many milliseconds to complete. |
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* @set: if true wait for flag to be set, else wait for it to be cleared |
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* |
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* Returns 0 on success, negative values indicate error. |
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*/ |
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static int pci_vpd_wait(struct pci_dev *dev, bool set) |
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{ |
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struct pci_vpd *vpd = &dev->vpd; |
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unsigned long timeout = jiffies + msecs_to_jiffies(125); |
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unsigned long max_sleep = 16; |
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u16 status; |
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int ret; |
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do { |
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ret = pci_user_read_config_word(dev, vpd->cap + PCI_VPD_ADDR, |
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&status); |
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if (ret < 0) |
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return ret; |
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if (!!(status & PCI_VPD_ADDR_F) == set) |
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return 0; |
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if (time_after(jiffies, timeout)) |
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break; |
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usleep_range(10, max_sleep); |
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if (max_sleep < 1024) |
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max_sleep *= 2; |
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} while (true); |
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pci_warn(dev, "VPD access failed. This is likely a firmware bug on this device. Contact the card vendor for a firmware update\n"); |
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return -ETIMEDOUT; |
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} |
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static ssize_t pci_vpd_read(struct pci_dev *dev, loff_t pos, size_t count, |
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void *arg) |
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{ |
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struct pci_vpd *vpd = &dev->vpd; |
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int ret = 0; |
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loff_t end = pos + count; |
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u8 *buf = arg; |
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if (!pci_vpd_available(dev)) |
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return -ENODEV; |
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if (pos < 0) |
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return -EINVAL; |
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if (pos > vpd->len) |
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return 0; |
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if (end > vpd->len) { |
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end = vpd->len; |
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count = end - pos; |
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} |
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if (mutex_lock_killable(&vpd->lock)) |
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return -EINTR; |
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while (pos < end) { |
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u32 val; |
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unsigned int i, skip; |
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if (fatal_signal_pending(current)) { |
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ret = -EINTR; |
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break; |
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} |
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ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR, |
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pos & ~3); |
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if (ret < 0) |
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break; |
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ret = pci_vpd_wait(dev, true); |
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if (ret < 0) |
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break; |
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ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA, &val); |
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if (ret < 0) |
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break; |
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skip = pos & 3; |
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for (i = 0; i < sizeof(u32); i++) { |
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if (i >= skip) { |
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*buf++ = val; |
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if (++pos == end) |
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break; |
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} |
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val >>= 8; |
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} |
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} |
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mutex_unlock(&vpd->lock); |
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return ret ? ret : count; |
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} |
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static ssize_t pci_vpd_write(struct pci_dev *dev, loff_t pos, size_t count, |
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const void *arg) |
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{ |
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struct pci_vpd *vpd = &dev->vpd; |
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const u8 *buf = arg; |
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loff_t end = pos + count; |
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int ret = 0; |
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if (!pci_vpd_available(dev)) |
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return -ENODEV; |
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if (pos < 0 || (pos & 3) || (count & 3)) |
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return -EINVAL; |
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if (end > vpd->len) |
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return -EINVAL; |
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if (mutex_lock_killable(&vpd->lock)) |
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return -EINTR; |
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while (pos < end) { |
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ret = pci_user_write_config_dword(dev, vpd->cap + PCI_VPD_DATA, |
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get_unaligned_le32(buf)); |
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if (ret < 0) |
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break; |
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ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR, |
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pos | PCI_VPD_ADDR_F); |
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if (ret < 0) |
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break; |
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ret = pci_vpd_wait(dev, false); |
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if (ret < 0) |
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break; |
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buf += sizeof(u32); |
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pos += sizeof(u32); |
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} |
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mutex_unlock(&vpd->lock); |
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return ret ? ret : count; |
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} |
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void pci_vpd_init(struct pci_dev *dev) |
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{ |
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if (dev->vpd.len == PCI_VPD_SZ_INVALID) |
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return; |
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dev->vpd.cap = pci_find_capability(dev, PCI_CAP_ID_VPD); |
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mutex_init(&dev->vpd.lock); |
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} |
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static ssize_t vpd_read(struct file *filp, struct kobject *kobj, |
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struct bin_attribute *bin_attr, char *buf, loff_t off, |
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size_t count) |
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{ |
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struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj)); |
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return pci_read_vpd(dev, off, count, buf); |
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} |
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static ssize_t vpd_write(struct file *filp, struct kobject *kobj, |
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struct bin_attribute *bin_attr, char *buf, loff_t off, |
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size_t count) |
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{ |
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struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj)); |
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return pci_write_vpd(dev, off, count, buf); |
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} |
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static BIN_ATTR(vpd, 0600, vpd_read, vpd_write, 0); |
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static struct bin_attribute *vpd_attrs[] = { |
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&bin_attr_vpd, |
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NULL, |
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}; |
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static umode_t vpd_attr_is_visible(struct kobject *kobj, |
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struct bin_attribute *a, int n) |
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{ |
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struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); |
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if (!pdev->vpd.cap) |
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return 0; |
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return a->attr.mode; |
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} |
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const struct attribute_group pci_dev_vpd_attr_group = { |
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.bin_attrs = vpd_attrs, |
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.is_bin_visible = vpd_attr_is_visible, |
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}; |
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void *pci_vpd_alloc(struct pci_dev *dev, unsigned int *size) |
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{ |
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unsigned int len; |
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void *buf; |
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int cnt; |
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if (!pci_vpd_available(dev)) |
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return ERR_PTR(-ENODEV); |
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len = dev->vpd.len; |
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buf = kmalloc(len, GFP_KERNEL); |
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if (!buf) |
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return ERR_PTR(-ENOMEM); |
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cnt = pci_read_vpd(dev, 0, len, buf); |
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if (cnt != len) { |
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kfree(buf); |
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return ERR_PTR(-EIO); |
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} |
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if (size) |
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*size = len; |
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return buf; |
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} |
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EXPORT_SYMBOL_GPL(pci_vpd_alloc); |
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static int pci_vpd_find_tag(const u8 *buf, unsigned int len, u8 rdt, unsigned int *size) |
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{ |
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int i = 0; |
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/* look for LRDT tags only, end tag is the only SRDT tag */ |
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while (i + PCI_VPD_LRDT_TAG_SIZE <= len && buf[i] & PCI_VPD_LRDT) { |
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unsigned int lrdt_len = pci_vpd_lrdt_size(buf + i); |
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u8 tag = buf[i]; |
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i += PCI_VPD_LRDT_TAG_SIZE; |
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if (tag == rdt) { |
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if (i + lrdt_len > len) |
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lrdt_len = len - i; |
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if (size) |
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*size = lrdt_len; |
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return i; |
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} |
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i += lrdt_len; |
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} |
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return -ENOENT; |
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} |
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int pci_vpd_find_id_string(const u8 *buf, unsigned int len, unsigned int *size) |
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{ |
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return pci_vpd_find_tag(buf, len, PCI_VPD_LRDT_ID_STRING, size); |
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} |
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EXPORT_SYMBOL_GPL(pci_vpd_find_id_string); |
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static int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off, |
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unsigned int len, const char *kw) |
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{ |
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int i; |
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for (i = off; i + PCI_VPD_INFO_FLD_HDR_SIZE <= off + len;) { |
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if (buf[i + 0] == kw[0] && |
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buf[i + 1] == kw[1]) |
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return i; |
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i += PCI_VPD_INFO_FLD_HDR_SIZE + |
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pci_vpd_info_field_size(&buf[i]); |
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} |
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return -ENOENT; |
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} |
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/** |
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* pci_read_vpd - Read one entry from Vital Product Data |
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* @dev: PCI device struct |
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* @pos: offset in VPD space |
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* @count: number of bytes to read |
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* @buf: pointer to where to store result |
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*/ |
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ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf) |
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{ |
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ssize_t ret; |
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if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0) { |
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dev = pci_get_func0_dev(dev); |
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if (!dev) |
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return -ENODEV; |
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ret = pci_vpd_read(dev, pos, count, buf); |
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pci_dev_put(dev); |
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return ret; |
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} |
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return pci_vpd_read(dev, pos, count, buf); |
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} |
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EXPORT_SYMBOL(pci_read_vpd); |
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/** |
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* pci_write_vpd - Write entry to Vital Product Data |
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* @dev: PCI device struct |
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* @pos: offset in VPD space |
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* @count: number of bytes to write |
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* @buf: buffer containing write data |
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*/ |
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ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf) |
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{ |
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ssize_t ret; |
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if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0) { |
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dev = pci_get_func0_dev(dev); |
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if (!dev) |
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return -ENODEV; |
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ret = pci_vpd_write(dev, pos, count, buf); |
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pci_dev_put(dev); |
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return ret; |
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} |
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return pci_vpd_write(dev, pos, count, buf); |
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} |
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EXPORT_SYMBOL(pci_write_vpd); |
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int pci_vpd_find_ro_info_keyword(const void *buf, unsigned int len, |
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const char *kw, unsigned int *size) |
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{ |
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int ro_start, infokw_start; |
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unsigned int ro_len, infokw_size; |
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ro_start = pci_vpd_find_tag(buf, len, PCI_VPD_LRDT_RO_DATA, &ro_len); |
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if (ro_start < 0) |
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return ro_start; |
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infokw_start = pci_vpd_find_info_keyword(buf, ro_start, ro_len, kw); |
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if (infokw_start < 0) |
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return infokw_start; |
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infokw_size = pci_vpd_info_field_size(buf + infokw_start); |
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infokw_start += PCI_VPD_INFO_FLD_HDR_SIZE; |
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if (infokw_start + infokw_size > len) |
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return -EINVAL; |
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if (size) |
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*size = infokw_size; |
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return infokw_start; |
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} |
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EXPORT_SYMBOL_GPL(pci_vpd_find_ro_info_keyword); |
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int pci_vpd_check_csum(const void *buf, unsigned int len) |
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{ |
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const u8 *vpd = buf; |
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unsigned int size; |
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u8 csum = 0; |
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int rv_start; |
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rv_start = pci_vpd_find_ro_info_keyword(buf, len, PCI_VPD_RO_KEYWORD_CHKSUM, &size); |
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if (rv_start == -ENOENT) /* no checksum in VPD */ |
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return 1; |
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else if (rv_start < 0) |
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return rv_start; |
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if (!size) |
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return -EINVAL; |
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while (rv_start >= 0) |
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csum += vpd[rv_start--]; |
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return csum ? -EILSEQ : 0; |
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} |
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EXPORT_SYMBOL_GPL(pci_vpd_check_csum); |
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#ifdef CONFIG_PCI_QUIRKS |
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/* |
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* Quirk non-zero PCI functions to route VPD access through function 0 for |
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* devices that share VPD resources between functions. The functions are |
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* expected to be identical devices. |
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*/ |
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static void quirk_f0_vpd_link(struct pci_dev *dev) |
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{ |
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struct pci_dev *f0; |
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if (!PCI_FUNC(dev->devfn)) |
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return; |
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f0 = pci_get_func0_dev(dev); |
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if (!f0) |
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return; |
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if (f0->vpd.cap && dev->class == f0->class && |
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dev->vendor == f0->vendor && dev->device == f0->device) |
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dev->dev_flags |= PCI_DEV_FLAGS_VPD_REF_F0; |
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pci_dev_put(f0); |
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} |
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DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, |
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PCI_CLASS_NETWORK_ETHERNET, 8, quirk_f0_vpd_link); |
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|
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/* |
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* If a device follows the VPD format spec, the PCI core will not read or |
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* write past the VPD End Tag. But some vendors do not follow the VPD |
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* format spec, so we can't tell how much data is safe to access. Devices |
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* may behave unpredictably if we access too much. Blacklist these devices |
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* so we don't touch VPD at all. |
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*/ |
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static void quirk_blacklist_vpd(struct pci_dev *dev) |
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{ |
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dev->vpd.len = PCI_VPD_SZ_INVALID; |
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pci_warn(dev, FW_BUG "disabling VPD access (can't determine size of non-standard VPD format)\n"); |
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} |
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x0060, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x007c, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x0413, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x0078, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x0079, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x0073, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x0071, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x005b, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x002f, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x005d, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_LSI_LOGIC, 0x005f, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_ATTANSIC, PCI_ANY_ID, quirk_blacklist_vpd); |
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/* |
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* The Amazon Annapurna Labs 0x0031 device id is reused for other non Root Port |
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* device types, so the quirk is registered for the PCI_CLASS_BRIDGE_PCI class. |
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*/ |
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DECLARE_PCI_FIXUP_CLASS_HEADER(PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031, |
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PCI_CLASS_BRIDGE_PCI, 8, quirk_blacklist_vpd); |
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|
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static void quirk_chelsio_extend_vpd(struct pci_dev *dev) |
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{ |
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int chip = (dev->device & 0xf000) >> 12; |
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int func = (dev->device & 0x0f00) >> 8; |
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int prod = (dev->device & 0x00ff) >> 0; |
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|
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/* |
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* If this is a T3-based adapter, there's a 1KB VPD area at offset |
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* 0xc00 which contains the preferred VPD values. If this is a T4 or |
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* later based adapter, the special VPD is at offset 0x400 for the |
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* Physical Functions (the SR-IOV Virtual Functions have no VPD |
|
* Capabilities). The PCI VPD Access core routines will normally |
|
* compute the size of the VPD by parsing the VPD Data Structure at |
|
* offset 0x000. This will result in silent failures when attempting |
|
* to accesses these other VPD areas which are beyond those computed |
|
* limits. |
|
*/ |
|
if (chip == 0x0 && prod >= 0x20) |
|
dev->vpd.len = 8192; |
|
else if (chip >= 0x4 && func < 0x8) |
|
dev->vpd.len = 2048; |
|
} |
|
|
|
DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_CHELSIO, PCI_ANY_ID, |
|
quirk_chelsio_extend_vpd); |
|
|
|
#endif
|
|
|