diff options
| -rw-r--r-- | drivers/pci/access.c | 368 | ||||
| -rw-r--r-- | drivers/pci/vpd.c | 369 |
2 files changed, 369 insertions, 368 deletions
diff --git a/drivers/pci/access.c b/drivers/pci/access.c index 5e9a9822d9d4..e080eb74bda0 100644 --- a/drivers/pci/access.c +++ b/drivers/pci/access.c @@ -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 diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c index 70fba57d6103..4596452d58bf 100644 --- a/drivers/pci/vpd.c +++ b/drivers/pci/vpd.c @@ -7,7 +7,376 @@ */ #include <linux/pci.h> +#include <linux/delay.h> #include <linux/export.h> +#include <linux/sched/signal.h> +#include "pci.h" + +/* 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); +} int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt) { |