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652 lines
16 KiB
652 lines
16 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 "pci.h" |
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/* VPD access through PCI 2.2+ VPD capability */ |
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struct pci_vpd_ops { |
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ssize_t (*read)(struct pci_dev *dev, loff_t pos, size_t count, void *buf); |
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ssize_t (*write)(struct pci_dev *dev, loff_t pos, size_t count, const void *buf); |
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int (*set_size)(struct pci_dev *dev, size_t len); |
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}; |
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struct pci_vpd { |
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const struct pci_vpd_ops *ops; |
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struct bin_attribute *attr; /* Descriptor for sysfs VPD entry */ |
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struct mutex lock; |
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unsigned int len; |
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u16 flag; |
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u8 cap; |
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unsigned int busy:1; |
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unsigned int valid:1; |
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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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if (!dev->vpd || !dev->vpd->ops) |
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return -ENODEV; |
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return dev->vpd->ops->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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if (!dev->vpd || !dev->vpd->ops) |
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return -ENODEV; |
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return dev->vpd->ops->write(dev, pos, count, buf); |
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} |
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EXPORT_SYMBOL(pci_write_vpd); |
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/** |
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* pci_set_vpd_size - Set size of Vital Product Data space |
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* @dev: pci device struct |
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* @len: size of vpd space |
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*/ |
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int pci_set_vpd_size(struct pci_dev *dev, size_t len) |
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{ |
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if (!dev->vpd || !dev->vpd->ops) |
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return -ENODEV; |
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return dev->vpd->ops->set_size(dev, len); |
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} |
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EXPORT_SYMBOL(pci_set_vpd_size); |
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#define PCI_VPD_MAX_SIZE (PCI_VPD_ADDR_MASK + 1) |
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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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* @old_size: current assumed size, also maximum allowed size |
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*/ |
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static size_t pci_vpd_size(struct pci_dev *dev, size_t old_size) |
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{ |
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size_t off = 0; |
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unsigned char header[1+2]; /* 1 byte tag, 2 bytes length */ |
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while (off < old_size && |
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pci_read_vpd(dev, off, 1, header) == 1) { |
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unsigned char tag; |
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if (header[0] & PCI_VPD_LRDT) { |
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/* Large Resource Data Type Tag */ |
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tag = pci_vpd_lrdt_tag(header); |
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/* Only read length from known tag items */ |
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if ((tag == PCI_VPD_LTIN_ID_STRING) || |
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(tag == PCI_VPD_LTIN_RO_DATA) || |
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(tag == PCI_VPD_LTIN_RW_DATA)) { |
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if (pci_read_vpd(dev, off+1, 2, |
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&header[1]) != 2) { |
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pci_warn(dev, "invalid large VPD tag %02x size at offset %zu", |
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tag, off + 1); |
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return 0; |
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} |
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off += PCI_VPD_LRDT_TAG_SIZE + |
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pci_vpd_lrdt_size(header); |
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} |
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} else { |
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/* Short Resource Data Type Tag */ |
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off += PCI_VPD_SRDT_TAG_SIZE + |
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pci_vpd_srdt_size(header); |
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tag = pci_vpd_srdt_tag(header); |
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} |
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if (tag == PCI_VPD_STIN_END) /* End tag descriptor */ |
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return off; |
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if ((tag != PCI_VPD_LTIN_ID_STRING) && |
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(tag != PCI_VPD_LTIN_RO_DATA) && |
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(tag != PCI_VPD_LTIN_RW_DATA)) { |
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pci_warn(dev, "invalid %s VPD tag %02x at offset %zu", |
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(header[0] & PCI_VPD_LRDT) ? "large" : "short", |
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tag, off); |
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return 0; |
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} |
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} |
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return 0; |
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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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* |
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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) |
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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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if (!vpd->busy) |
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return 0; |
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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) == vpd->flag) { |
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vpd->busy = 0; |
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return 0; |
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} |
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if (fatal_signal_pending(current)) |
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return -EINTR; |
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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; |
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loff_t end = pos + count; |
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u8 *buf = arg; |
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if (pos < 0) |
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return -EINVAL; |
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if (!vpd->valid) { |
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vpd->valid = 1; |
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vpd->len = pci_vpd_size(dev, vpd->len); |
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} |
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if (vpd->len == 0) |
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return -EIO; |
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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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ret = pci_vpd_wait(dev); |
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if (ret < 0) |
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goto out; |
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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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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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vpd->busy = 1; |
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vpd->flag = PCI_VPD_ADDR_F; |
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ret = pci_vpd_wait(dev); |
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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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out: |
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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 (pos < 0 || (pos & 3) || (count & 3)) |
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return -EINVAL; |
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if (!vpd->valid) { |
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vpd->valid = 1; |
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vpd->len = pci_vpd_size(dev, vpd->len); |
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} |
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if (vpd->len == 0) |
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return -EIO; |
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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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ret = pci_vpd_wait(dev); |
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if (ret < 0) |
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goto out; |
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while (pos < end) { |
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u32 val; |
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val = *buf++; |
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val |= *buf++ << 8; |
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val |= *buf++ << 16; |
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val |= *buf++ << 24; |
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ret = pci_user_write_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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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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vpd->busy = 1; |
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vpd->flag = 0; |
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ret = pci_vpd_wait(dev); |
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if (ret < 0) |
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break; |
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pos += sizeof(u32); |
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} |
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out: |
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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 int pci_vpd_set_size(struct pci_dev *dev, size_t len) |
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{ |
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struct pci_vpd *vpd = dev->vpd; |
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if (len == 0 || len > PCI_VPD_MAX_SIZE) |
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return -EIO; |
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vpd->valid = 1; |
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vpd->len = len; |
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return 0; |
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} |
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static const struct pci_vpd_ops pci_vpd_ops = { |
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.read = pci_vpd_read, |
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.write = pci_vpd_write, |
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.set_size = pci_vpd_set_size, |
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}; |
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static ssize_t pci_vpd_f0_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_dev *tdev = pci_get_slot(dev->bus, |
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PCI_DEVFN(PCI_SLOT(dev->devfn), 0)); |
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ssize_t ret; |
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if (!tdev) |
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return -ENODEV; |
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ret = pci_read_vpd(tdev, pos, count, arg); |
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pci_dev_put(tdev); |
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return ret; |
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} |
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static ssize_t pci_vpd_f0_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_dev *tdev = pci_get_slot(dev->bus, |
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PCI_DEVFN(PCI_SLOT(dev->devfn), 0)); |
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ssize_t ret; |
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if (!tdev) |
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return -ENODEV; |
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ret = pci_write_vpd(tdev, pos, count, arg); |
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pci_dev_put(tdev); |
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return ret; |
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} |
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static int pci_vpd_f0_set_size(struct pci_dev *dev, size_t len) |
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{ |
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struct pci_dev *tdev = pci_get_slot(dev->bus, |
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PCI_DEVFN(PCI_SLOT(dev->devfn), 0)); |
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int ret; |
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if (!tdev) |
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return -ENODEV; |
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ret = pci_set_vpd_size(tdev, len); |
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pci_dev_put(tdev); |
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return ret; |
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} |
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static const struct pci_vpd_ops pci_vpd_f0_ops = { |
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.read = pci_vpd_f0_read, |
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.write = pci_vpd_f0_write, |
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.set_size = pci_vpd_f0_set_size, |
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}; |
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int pci_vpd_init(struct pci_dev *dev) |
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{ |
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struct pci_vpd *vpd; |
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u8 cap; |
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cap = pci_find_capability(dev, PCI_CAP_ID_VPD); |
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if (!cap) |
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return -ENODEV; |
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vpd = kzalloc(sizeof(*vpd), GFP_ATOMIC); |
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if (!vpd) |
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return -ENOMEM; |
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vpd->len = PCI_VPD_MAX_SIZE; |
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if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0) |
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vpd->ops = &pci_vpd_f0_ops; |
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else |
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vpd->ops = &pci_vpd_ops; |
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mutex_init(&vpd->lock); |
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vpd->cap = cap; |
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vpd->busy = 0; |
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vpd->valid = 0; |
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dev->vpd = vpd; |
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return 0; |
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} |
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void pci_vpd_release(struct pci_dev *dev) |
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{ |
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kfree(dev->vpd); |
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} |
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static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj, |
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struct bin_attribute *bin_attr, char *buf, |
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loff_t off, 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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if (bin_attr->size > 0) { |
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if (off > bin_attr->size) |
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count = 0; |
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else if (count > bin_attr->size - off) |
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count = bin_attr->size - off; |
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} |
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return pci_read_vpd(dev, off, count, buf); |
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} |
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static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj, |
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struct bin_attribute *bin_attr, char *buf, |
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loff_t off, 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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if (bin_attr->size > 0) { |
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if (off > bin_attr->size) |
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count = 0; |
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else if (count > bin_attr->size - off) |
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count = bin_attr->size - off; |
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} |
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return pci_write_vpd(dev, off, count, buf); |
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} |
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void pcie_vpd_create_sysfs_dev_files(struct pci_dev *dev) |
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{ |
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int retval; |
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struct bin_attribute *attr; |
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if (!dev->vpd) |
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return; |
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attr = kzalloc(sizeof(*attr), GFP_ATOMIC); |
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if (!attr) |
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return; |
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sysfs_bin_attr_init(attr); |
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attr->size = 0; |
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attr->attr.name = "vpd"; |
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attr->attr.mode = S_IRUSR | S_IWUSR; |
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attr->read = read_vpd_attr; |
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attr->write = write_vpd_attr; |
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retval = sysfs_create_bin_file(&dev->dev.kobj, attr); |
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if (retval) { |
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kfree(attr); |
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return; |
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} |
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dev->vpd->attr = attr; |
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} |
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void pcie_vpd_remove_sysfs_dev_files(struct pci_dev *dev) |
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{ |
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if (dev->vpd && dev->vpd->attr) { |
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sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr); |
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kfree(dev->vpd->attr); |
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} |
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} |
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int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt) |
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{ |
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int i; |
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for (i = off; i < len; ) { |
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u8 val = buf[i]; |
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if (val & PCI_VPD_LRDT) { |
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/* Don't return success of the tag isn't complete */ |
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if (i + PCI_VPD_LRDT_TAG_SIZE > len) |
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break; |
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if (val == rdt) |
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return i; |
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i += PCI_VPD_LRDT_TAG_SIZE + |
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pci_vpd_lrdt_size(&buf[i]); |
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} else { |
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u8 tag = val & ~PCI_VPD_SRDT_LEN_MASK; |
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if (tag == rdt) |
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return i; |
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if (tag == PCI_VPD_SRDT_END) |
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break; |
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i += PCI_VPD_SRDT_TAG_SIZE + |
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pci_vpd_srdt_size(&buf[i]); |
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} |
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} |
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return -ENOENT; |
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} |
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EXPORT_SYMBOL_GPL(pci_vpd_find_tag); |
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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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EXPORT_SYMBOL_GPL(pci_vpd_find_info_keyword); |
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|
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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_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0)); |
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if (!f0) |
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return; |
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if (f0->vpd && 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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if (dev->vpd) { |
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dev->vpd->len = 0; |
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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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} |
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0060, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x007c, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0413, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0078, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0079, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0073, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x0071, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x005b, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x002f, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x005d, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_LSI_LOGIC, 0x005f, quirk_blacklist_vpd); |
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DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATTANSIC, PCI_ANY_ID, |
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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 |
|
* 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_FINAL(PCI_VENDOR_ID_AMAZON_ANNAPURNA_LABS, 0x0031, |
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PCI_CLASS_BRIDGE_PCI, 8, quirk_blacklist_vpd); |
|
|
|
/* |
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* For Broadcom 5706, 5708, 5709 rev. A nics, any read beyond the |
|
* VPD end tag will hang the device. This problem was initially |
|
* observed when a vpd entry was created in sysfs |
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* ('/sys/bus/pci/devices/<id>/vpd'). A read to this sysfs entry |
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* will dump 32k of data. Reading a full 32k will cause an access |
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* beyond the VPD end tag causing the device to hang. Once the device |
|
* is hung, the bnx2 driver will not be able to reset the device. |
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* We believe that it is legal to read beyond the end tag and |
|
* therefore the solution is to limit the read/write length. |
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*/ |
|
static void quirk_brcm_570x_limit_vpd(struct pci_dev *dev) |
|
{ |
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/* |
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* Only disable the VPD capability for 5706, 5706S, 5708, |
|
* 5708S and 5709 rev. A |
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*/ |
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if ((dev->device == PCI_DEVICE_ID_NX2_5706) || |
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(dev->device == PCI_DEVICE_ID_NX2_5706S) || |
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(dev->device == PCI_DEVICE_ID_NX2_5708) || |
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(dev->device == PCI_DEVICE_ID_NX2_5708S) || |
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((dev->device == PCI_DEVICE_ID_NX2_5709) && |
|
(dev->revision & 0xf0) == 0x0)) { |
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if (dev->vpd) |
|
dev->vpd->len = 0x80; |
|
} |
|
} |
|
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM, |
|
PCI_DEVICE_ID_NX2_5706, |
|
quirk_brcm_570x_limit_vpd); |
|
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM, |
|
PCI_DEVICE_ID_NX2_5706S, |
|
quirk_brcm_570x_limit_vpd); |
|
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM, |
|
PCI_DEVICE_ID_NX2_5708, |
|
quirk_brcm_570x_limit_vpd); |
|
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM, |
|
PCI_DEVICE_ID_NX2_5708S, |
|
quirk_brcm_570x_limit_vpd); |
|
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM, |
|
PCI_DEVICE_ID_NX2_5709, |
|
quirk_brcm_570x_limit_vpd); |
|
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_BROADCOM, |
|
PCI_DEVICE_ID_NX2_5709S, |
|
quirk_brcm_570x_limit_vpd); |
|
|
|
static void quirk_chelsio_extend_vpd(struct pci_dev *dev) |
|
{ |
|
int chip = (dev->device & 0xf000) >> 12; |
|
int func = (dev->device & 0x0f00) >> 8; |
|
int prod = (dev->device & 0x00ff) >> 0; |
|
|
|
/* |
|
* If this is a T3-based adapter, there's a 1KB VPD area at offset |
|
* 0xc00 which contains the preferred VPD values. If this is a T4 or |
|
* later based adapter, the special VPD is at offset 0x400 for the |
|
* 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) |
|
pci_set_vpd_size(dev, 8192); |
|
else if (chip >= 0x4 && func < 0x8) |
|
pci_set_vpd_size(dev, 2048); |
|
} |
|
|
|
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_CHELSIO, PCI_ANY_ID, |
|
quirk_chelsio_extend_vpd); |
|
|
|
#endif
|
|
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