Merge branch 'pci/vpd'
[muen/linux.git] / drivers / pci / access.c
index dcaacb4bb880fa982f56169af86631aa8b1d9aca..a3ad2fe185b9c517923fc0a26897af0e289dcdd6 100644 (file)
@@ -1,8 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
-#include <linux/delay.h>
 #include <linux/pci.h>
 #include <linux/module.h>
-#include <linux/sched/signal.h>
 #include <linux/slab.h>
 #include <linux/ioport.h>
 #include <linux/wait.h>
@@ -264,372 +262,6 @@ PCI_USER_WRITE_CONFIG(byte, u8)
 PCI_USER_WRITE_CONFIG(word, u16)
 PCI_USER_WRITE_CONFIG(dword, u32)
 
-/* VPD access through PCI 2.2+ VPD capability */
-
-/**
- * pci_read_vpd - Read one entry from Vital Product Data
- * @dev:       pci device struct
- * @pos:       offset in vpd space
- * @count:     number of bytes to read
- * @buf:       pointer to where to store result
- */
-ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf)
-{
-       if (!dev->vpd || !dev->vpd->ops)
-               return -ENODEV;
-       return dev->vpd->ops->read(dev, pos, count, buf);
-}
-EXPORT_SYMBOL(pci_read_vpd);
-
-/**
- * pci_write_vpd - Write entry to Vital Product Data
- * @dev:       pci device struct
- * @pos:       offset in vpd space
- * @count:     number of bytes to write
- * @buf:       buffer containing write data
- */
-ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf)
-{
-       if (!dev->vpd || !dev->vpd->ops)
-               return -ENODEV;
-       return dev->vpd->ops->write(dev, pos, count, buf);
-}
-EXPORT_SYMBOL(pci_write_vpd);
-
-/**
- * pci_set_vpd_size - Set size of Vital Product Data space
- * @dev:       pci device struct
- * @len:       size of vpd space
- */
-int pci_set_vpd_size(struct pci_dev *dev, size_t len)
-{
-       if (!dev->vpd || !dev->vpd->ops)
-               return -ENODEV;
-       return dev->vpd->ops->set_size(dev, len);
-}
-EXPORT_SYMBOL(pci_set_vpd_size);
-
-#define PCI_VPD_MAX_SIZE (PCI_VPD_ADDR_MASK + 1)
-
-/**
- * pci_vpd_size - determine actual size of Vital Product Data
- * @dev:       pci device struct
- * @old_size:  current assumed size, also maximum allowed size
- */
-static size_t pci_vpd_size(struct pci_dev *dev, size_t old_size)
-{
-       size_t off = 0;
-       unsigned char header[1+2];      /* 1 byte tag, 2 bytes length */
-
-       while (off < old_size &&
-              pci_read_vpd(dev, off, 1, header) == 1) {
-               unsigned char tag;
-
-               if (header[0] & PCI_VPD_LRDT) {
-                       /* Large Resource Data Type Tag */
-                       tag = pci_vpd_lrdt_tag(header);
-                       /* Only read length from known tag items */
-                       if ((tag == PCI_VPD_LTIN_ID_STRING) ||
-                           (tag == PCI_VPD_LTIN_RO_DATA) ||
-                           (tag == PCI_VPD_LTIN_RW_DATA)) {
-                               if (pci_read_vpd(dev, off+1, 2,
-                                                &header[1]) != 2) {
-                                       pci_warn(dev, "invalid large VPD tag %02x size at offset %zu",
-                                                tag, off + 1);
-                                       return 0;
-                               }
-                               off += PCI_VPD_LRDT_TAG_SIZE +
-                                       pci_vpd_lrdt_size(header);
-                       }
-               } else {
-                       /* Short Resource Data Type Tag */
-                       off += PCI_VPD_SRDT_TAG_SIZE +
-                               pci_vpd_srdt_size(header);
-                       tag = pci_vpd_srdt_tag(header);
-               }
-
-               if (tag == PCI_VPD_STIN_END)    /* End tag descriptor */
-                       return off;
-
-               if ((tag != PCI_VPD_LTIN_ID_STRING) &&
-                   (tag != PCI_VPD_LTIN_RO_DATA) &&
-                   (tag != PCI_VPD_LTIN_RW_DATA)) {
-                       pci_warn(dev, "invalid %s VPD tag %02x at offset %zu",
-                                (header[0] & PCI_VPD_LRDT) ? "large" : "short",
-                                tag, off);
-                       return 0;
-               }
-       }
-       return 0;
-}
-
-/*
- * Wait for last operation to complete.
- * This code has to spin since there is no other notification from the PCI
- * hardware. Since the VPD is often implemented by serial attachment to an
- * EEPROM, it may take many milliseconds to complete.
- *
- * Returns 0 on success, negative values indicate error.
- */
-static int pci_vpd_wait(struct pci_dev *dev)
-{
-       struct pci_vpd *vpd = dev->vpd;
-       unsigned long timeout = jiffies + msecs_to_jiffies(125);
-       unsigned long max_sleep = 16;
-       u16 status;
-       int ret;
-
-       if (!vpd->busy)
-               return 0;
-
-       while (time_before(jiffies, timeout)) {
-               ret = pci_user_read_config_word(dev, vpd->cap + PCI_VPD_ADDR,
-                                               &status);
-               if (ret < 0)
-                       return ret;
-
-               if ((status & PCI_VPD_ADDR_F) == vpd->flag) {
-                       vpd->busy = 0;
-                       return 0;
-               }
-
-               if (fatal_signal_pending(current))
-                       return -EINTR;
-
-               usleep_range(10, max_sleep);
-               if (max_sleep < 1024)
-                       max_sleep *= 2;
-       }
-
-       pci_warn(dev, "VPD access failed.  This is likely a firmware bug on this device.  Contact the card vendor for a firmware update\n");
-       return -ETIMEDOUT;
-}
-
-static ssize_t pci_vpd_read(struct pci_dev *dev, loff_t pos, size_t count,
-                           void *arg)
-{
-       struct pci_vpd *vpd = dev->vpd;
-       int ret;
-       loff_t end = pos + count;
-       u8 *buf = arg;
-
-       if (pos < 0)
-               return -EINVAL;
-
-       if (!vpd->valid) {
-               vpd->valid = 1;
-               vpd->len = pci_vpd_size(dev, vpd->len);
-       }
-
-       if (vpd->len == 0)
-               return -EIO;
-
-       if (pos > vpd->len)
-               return 0;
-
-       if (end > vpd->len) {
-               end = vpd->len;
-               count = end - pos;
-       }
-
-       if (mutex_lock_killable(&vpd->lock))
-               return -EINTR;
-
-       ret = pci_vpd_wait(dev);
-       if (ret < 0)
-               goto out;
-
-       while (pos < end) {
-               u32 val;
-               unsigned int i, skip;
-
-               ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
-                                                pos & ~3);
-               if (ret < 0)
-                       break;
-               vpd->busy = 1;
-               vpd->flag = PCI_VPD_ADDR_F;
-               ret = pci_vpd_wait(dev);
-               if (ret < 0)
-                       break;
-
-               ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA, &val);
-               if (ret < 0)
-                       break;
-
-               skip = pos & 3;
-               for (i = 0;  i < sizeof(u32); i++) {
-                       if (i >= skip) {
-                               *buf++ = val;
-                               if (++pos == end)
-                                       break;
-                       }
-                       val >>= 8;
-               }
-       }
-out:
-       mutex_unlock(&vpd->lock);
-       return ret ? ret : count;
-}
-
-static ssize_t pci_vpd_write(struct pci_dev *dev, loff_t pos, size_t count,
-                            const void *arg)
-{
-       struct pci_vpd *vpd = dev->vpd;
-       const u8 *buf = arg;
-       loff_t end = pos + count;
-       int ret = 0;
-
-       if (pos < 0 || (pos & 3) || (count & 3))
-               return -EINVAL;
-
-       if (!vpd->valid) {
-               vpd->valid = 1;
-               vpd->len = pci_vpd_size(dev, vpd->len);
-       }
-
-       if (vpd->len == 0)
-               return -EIO;
-
-       if (end > vpd->len)
-               return -EINVAL;
-
-       if (mutex_lock_killable(&vpd->lock))
-               return -EINTR;
-
-       ret = pci_vpd_wait(dev);
-       if (ret < 0)
-               goto out;
-
-       while (pos < end) {
-               u32 val;
-
-               val = *buf++;
-               val |= *buf++ << 8;
-               val |= *buf++ << 16;
-               val |= *buf++ << 24;
-
-               ret = pci_user_write_config_dword(dev, vpd->cap + PCI_VPD_DATA, val);
-               if (ret < 0)
-                       break;
-               ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
-                                                pos | PCI_VPD_ADDR_F);
-               if (ret < 0)
-                       break;
-
-               vpd->busy = 1;
-               vpd->flag = 0;
-               ret = pci_vpd_wait(dev);
-               if (ret < 0)
-                       break;
-
-               pos += sizeof(u32);
-       }
-out:
-       mutex_unlock(&vpd->lock);
-       return ret ? ret : count;
-}
-
-static int pci_vpd_set_size(struct pci_dev *dev, size_t len)
-{
-       struct pci_vpd *vpd = dev->vpd;
-
-       if (len == 0 || len > PCI_VPD_MAX_SIZE)
-               return -EIO;
-
-       vpd->valid = 1;
-       vpd->len = len;
-
-       return 0;
-}
-
-static const struct pci_vpd_ops pci_vpd_ops = {
-       .read = pci_vpd_read,
-       .write = pci_vpd_write,
-       .set_size = pci_vpd_set_size,
-};
-
-static ssize_t pci_vpd_f0_read(struct pci_dev *dev, loff_t pos, size_t count,
-                              void *arg)
-{
-       struct pci_dev *tdev = pci_get_slot(dev->bus,
-                                           PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
-       ssize_t ret;
-
-       if (!tdev)
-               return -ENODEV;
-
-       ret = pci_read_vpd(tdev, pos, count, arg);
-       pci_dev_put(tdev);
-       return ret;
-}
-
-static ssize_t pci_vpd_f0_write(struct pci_dev *dev, loff_t pos, size_t count,
-                               const void *arg)
-{
-       struct pci_dev *tdev = pci_get_slot(dev->bus,
-                                           PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
-       ssize_t ret;
-
-       if (!tdev)
-               return -ENODEV;
-
-       ret = pci_write_vpd(tdev, pos, count, arg);
-       pci_dev_put(tdev);
-       return ret;
-}
-
-static int pci_vpd_f0_set_size(struct pci_dev *dev, size_t len)
-{
-       struct pci_dev *tdev = pci_get_slot(dev->bus,
-                                           PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
-       int ret;
-
-       if (!tdev)
-               return -ENODEV;
-
-       ret = pci_set_vpd_size(tdev, len);
-       pci_dev_put(tdev);
-       return ret;
-}
-
-static const struct pci_vpd_ops pci_vpd_f0_ops = {
-       .read = pci_vpd_f0_read,
-       .write = pci_vpd_f0_write,
-       .set_size = pci_vpd_f0_set_size,
-};
-
-int pci_vpd_init(struct pci_dev *dev)
-{
-       struct pci_vpd *vpd;
-       u8 cap;
-
-       cap = pci_find_capability(dev, PCI_CAP_ID_VPD);
-       if (!cap)
-               return -ENODEV;
-
-       vpd = kzalloc(sizeof(*vpd), GFP_ATOMIC);
-       if (!vpd)
-               return -ENOMEM;
-
-       vpd->len = PCI_VPD_MAX_SIZE;
-       if (dev->dev_flags & PCI_DEV_FLAGS_VPD_REF_F0)
-               vpd->ops = &pci_vpd_f0_ops;
-       else
-               vpd->ops = &pci_vpd_ops;
-       mutex_init(&vpd->lock);
-       vpd->cap = cap;
-       vpd->busy = 0;
-       vpd->valid = 0;
-       dev->vpd = vpd;
-       return 0;
-}
-
-void pci_vpd_release(struct pci_dev *dev)
-{
-       kfree(dev->vpd);
-}
-
 /**
  * pci_cfg_access_lock - Lock PCI config reads/writes
  * @dev:       pci device struct