433 lines
8.9 KiB
C
433 lines
8.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* File: vpd.c
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* Purpose: Provide PCI VPD support
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*
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* Copyright (C) 2010 Broadcom Corporation.
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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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/**
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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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while (time_before(jiffies, timeout)) {
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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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usleep_range(10, max_sleep);
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if (max_sleep < 1024)
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max_sleep *= 2;
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}
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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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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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