6 files changed, 297 insertions, 14 deletions

diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
new file mode 100644
index 000000000000..ceddcff4082a
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-pci
@@ -0,0 +1,11 @@
+What:           /sys/bus/pci/devices/.../vpd
+Date:           February 2008
+Contact:        Ben Hutchings <bhutchings@solarflare.com>
+Description:
+                A file named vpd in a device directory will be a
+                binary file containing the Vital Product Data for the
+                device.  It should follow the VPD format defined in
+                PCI Specification 2.1 or 2.2, but users should consider
+                that some devices may have malformatted data.  If the
+                underlying VPD has a writable section then the
+                corresponding section of this file will be writable.
diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index fc405f0165d9..ec8f7002b09d 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -1,3 +1,4 @@
+#include <linux/delay.h>
 #include <linux/pci.h>
 #include <linux/module.h>
 #include <linux/sched.h>
@@ -126,6 +127,171 @@ 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 */
+
+#define PCI_VPD_PCI22_SIZE (PCI_VPD_ADDR_MASK + 1)
+
+struct pci_vpd_pci22 {
+        struct pci_vpd base;
+        spinlock_t lock; /* controls access to hardware and the flags */
+        u8      cap;
+        bool    busy;
+        bool    flag; /* value of F bit to wait for */
+};
+
+/* Wait for last operation to complete */
+static int pci_vpd_pci22_wait(struct pci_dev *dev)
+{
+        struct pci_vpd_pci22 *vpd =
+                container_of(dev->vpd, struct pci_vpd_pci22, base);
+        u16 flag, status;
+        int wait;
+        int ret;
+
+        if (!vpd->busy)
+                return 0;
+
+        flag = vpd->flag ? PCI_VPD_ADDR_F : 0;
+        wait = vpd->flag ? 10 : 1000; /* read: 100 us; write: 10 ms */
+        for (;;) {
+                ret = pci_user_read_config_word(dev,
+                                                vpd->cap + PCI_VPD_ADDR,
+                                                &status);
+                if (ret < 0)
+                        return ret;
+                if ((status & PCI_VPD_ADDR_F) == flag) {
+                        vpd->busy = false;
+                        return 0;
+                }
+                if (wait-- == 0)
+                        return -ETIMEDOUT;
+                udelay(10);
+        }
+}
+
+static int pci_vpd_pci22_read(struct pci_dev *dev, int pos, int size,
+                              char *buf)
+{
+        struct pci_vpd_pci22 *vpd =
+                container_of(dev->vpd, struct pci_vpd_pci22, base);
+        u32 val;
+        int ret;
+        int begin, end, i;
+
+        if (pos < 0 || pos > PCI_VPD_PCI22_SIZE ||
+            size > PCI_VPD_PCI22_SIZE  - pos)
+                return -EINVAL;
+        if (size == 0)
+                return 0;
+
+        spin_lock_irq(&vpd->lock);
+        ret = pci_vpd_pci22_wait(dev);
+        if (ret < 0)
+                goto out;
+        ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
+                                         pos & ~3);
+        if (ret < 0)
+                goto out;
+        vpd->busy = true;
+        vpd->flag = 1;
+        ret = pci_vpd_pci22_wait(dev);
+        if (ret < 0)
+                goto out;
+        ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA,
+                                         &val);
+out:
+        spin_unlock_irq(&vpd->lock);
+        if (ret < 0)
+                return ret;
+
+        /* Convert to bytes */
+        begin = pos & 3;
+        end = min(4, begin + size);
+        for (i = 0; i < end; ++i) {
+                if (i >= begin)
+                        *buf++ = val;
+                val >>= 8;
+        }
+        return end - begin;
+}
+
+static int pci_vpd_pci22_write(struct pci_dev *dev, int pos, int size,
+                               const char *buf)
+{
+        struct pci_vpd_pci22 *vpd =
+                container_of(dev->vpd, struct pci_vpd_pci22, base);
+        u32 val;
+        int ret;
+
+        if (pos < 0 || pos > PCI_VPD_PCI22_SIZE || pos & 3 ||
+            size > PCI_VPD_PCI22_SIZE - pos || size < 4)
+                return -EINVAL;
+
+        val = (u8) *buf++;
+        val |= ((u8) *buf++) << 8;
+        val |= ((u8) *buf++) << 16;
+        val |= ((u32)(u8) *buf++) << 24;
+
+        spin_lock_irq(&vpd->lock);
+        ret = pci_vpd_pci22_wait(dev);
+        if (ret < 0)
+                goto out;
+        ret = pci_user_write_config_dword(dev, vpd->cap + PCI_VPD_DATA,
+                                          val);
+        if (ret < 0)
+                goto out;
+        ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
+                                         pos | PCI_VPD_ADDR_F);
+        if (ret < 0)
+                goto out;
+        vpd->busy = true;
+        vpd->flag = 0;
+        ret = pci_vpd_pci22_wait(dev);
+out:
+        spin_unlock_irq(&vpd->lock);
+        if (ret < 0)
+                return ret;
+
+        return 4;
+}
+
+static int pci_vpd_pci22_get_size(struct pci_dev *dev)
+{
+        return PCI_VPD_PCI22_SIZE;
+}
+
+static void pci_vpd_pci22_release(struct pci_dev *dev)
+{
+        kfree(container_of(dev->vpd, struct pci_vpd_pci22, base));
+}
+
+static struct pci_vpd_ops pci_vpd_pci22_ops = {
+        .read = pci_vpd_pci22_read,
+        .write = pci_vpd_pci22_write,
+        .get_size = pci_vpd_pci22_get_size,
+        .release = pci_vpd_pci22_release,
+};
+
+int pci_vpd_pci22_init(struct pci_dev *dev)
+{
+        struct pci_vpd_pci22 *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->base.ops = &pci_vpd_pci22_ops;
+        spin_lock_init(&vpd->lock);
+        vpd->cap = cap;
+        vpd->busy = false;
+        dev->vpd = &vpd->base;
+        return 0;
+}
+
 /**
  * pci_block_user_cfg_access - Block userspace PCI config reads/writes
  * @dev:        pci device struct
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index f5b0b622c189..ae9a7695be97 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -343,6 +343,58 @@ pci_write_config(struct kobject *kobj, struct bin_attribute *bin_attr,
         return count;
 }
 
+static ssize_t
+pci_read_vpd(struct kobject *kobj, struct bin_attribute *bin_attr,
+             char *buf, loff_t off, size_t count)
+{
+        struct pci_dev *dev =
+                to_pci_dev(container_of(kobj, struct device, kobj));
+        int end;
+        int ret;
+
+        if (off > bin_attr->size)
+                count = 0;
+        else if (count > bin_attr->size - off)
+                count = bin_attr->size - off;
+        end = off + count;
+
+        while (off < end) {
+                ret = dev->vpd->ops->read(dev, off, end - off, buf);
+                if (ret < 0)
+                        return ret;
+                buf += ret;
+                off += ret;
+        }
+
+        return count;
+}
+
+static ssize_t
+pci_write_vpd(struct kobject *kobj, struct bin_attribute *bin_attr,
+              char *buf, loff_t off, size_t count)
+{
+        struct pci_dev *dev =
+                to_pci_dev(container_of(kobj, struct device, kobj));
+        int end;
+        int ret;
+
+        if (off > bin_attr->size)
+                count = 0;
+        else if (count > bin_attr->size - off)
+                count = bin_attr->size - off;
+        end = off + count;
+
+        while (off < end) {
+                ret = dev->vpd->ops->write(dev, off, end - off, buf);
+                if (ret < 0)
+                        return ret;
+                buf += ret;
+                off += ret;
+        }
+
+        return count;
+}
+
 #ifdef HAVE_PCI_LEGACY
 /**
  * pci_read_legacy_io - read byte(s) from legacy I/O port space
@@ -611,7 +663,7 @@ int __attribute__ ((weak)) pcibios_add_platform_entries(struct pci_dev *dev)
 
 int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
 {
-        struct bin_attribute *rom_attr = NULL;
+        struct bin_attribute *attr = NULL;
         int retval;
 
         if (!sysfs_initialized)
@@ -624,22 +676,41 @@ int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
         if (retval)
                 goto err;
 
+        /* If the device has VPD, try to expose it in sysfs. */
+        if (pdev->vpd) {
+                attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
+                if (attr) {
+                        pdev->vpd->attr = attr;
+                        attr->size = pdev->vpd->ops->get_size(pdev);
+                        attr->attr.name = "vpd";
+                        attr->attr.mode = S_IRUGO | S_IWUSR;
+                        attr->read = pci_read_vpd;
+                        attr->write = pci_write_vpd;
+                        retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
+                        if (retval)
+                                goto err_vpd;
+                } else {
+                        retval = -ENOMEM;
+                        goto err_config_file;
+                }
+        }
+
         retval = pci_create_resource_files(pdev);
         if (retval)
-                goto err_bin_file;
+                goto err_vpd_file;
 
         /* If the device has a ROM, try to expose it in sysfs. */
         if (pci_resource_len(pdev, PCI_ROM_RESOURCE) ||
             (pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW)) {
-                rom_attr = kzalloc(sizeof(*rom_attr), GFP_ATOMIC);
-                if (rom_attr) {
-                        pdev->rom_attr = rom_attr;
-                        rom_attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
-                        rom_attr->attr.name = "rom";
-                        rom_attr->attr.mode = S_IRUSR;
-                        rom_attr->read = pci_read_rom;
-                        rom_attr->write = pci_write_rom;
-                        retval = sysfs_create_bin_file(&pdev->dev.kobj, rom_attr);
+                attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
+                if (attr) {
+                        pdev->rom_attr = attr;
+                        attr->size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
+                        attr->attr.name = "rom";
+                        attr->attr.mode = S_IRUSR;
+                        attr->read = pci_read_rom;
+                        attr->write = pci_write_rom;
+                        retval = sysfs_create_bin_file(&pdev->dev.kobj, attr);
                         if (retval)
                                 goto err_rom;
                 } else {
@@ -657,12 +728,18 @@ int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
 
 err_rom_file:
         if (pci_resource_len(pdev, PCI_ROM_RESOURCE))
-                sysfs_remove_bin_file(&pdev->dev.kobj, rom_attr);
+                sysfs_remove_bin_file(&pdev->dev.kobj, pdev->rom_attr);
 err_rom:
-        kfree(rom_attr);
+        kfree(pdev->rom_attr);
 err_resource_files:
         pci_remove_resource_files(pdev);
-err_bin_file:
+err_vpd_file:
+        if (pdev->vpd) {
+                sysfs_remove_bin_file(&pdev->dev.kobj, pdev->vpd->attr);
+err_vpd:
+                kfree(pdev->vpd->attr);
+        }
+err_config_file:
         if (pdev->cfg_size < 4096)
                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
         else
@@ -684,6 +761,10 @@ void pci_remove_sysfs_dev_files(struct pci_dev *pdev)
 
         pcie_aspm_remove_sysfs_dev_files(pdev);
 
+        if (pdev->vpd) {
+                sysfs_remove_bin_file(&pdev->dev.kobj, pdev->vpd->attr);
+                kfree(pdev->vpd->attr);
+        }
         if (pdev->cfg_size < 4096)
                 sysfs_remove_bin_file(&pdev->dev.kobj, &pci_config_attr);
         else
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index eabeb1f2ec99..0a497c1b4227 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -18,6 +18,25 @@ extern int pci_user_write_config_byte(struct pci_dev *dev, int where, u8 val);
 extern int pci_user_write_config_word(struct pci_dev *dev, int where, u16 val);
 extern int pci_user_write_config_dword(struct pci_dev *dev, int where, u32 val);
 
+struct pci_vpd_ops {
+        int (*read)(struct pci_dev *dev, int pos, int size, char *buf);
+        int (*write)(struct pci_dev *dev, int pos, int size, const char *buf);
+        int (*get_size)(struct pci_dev *dev);
+        void (*release)(struct pci_dev *dev);
+};
+
+struct pci_vpd {
+        struct pci_vpd_ops *ops;
+        struct bin_attribute *attr; /* descriptor for sysfs VPD entry */
+};
+
+extern int pci_vpd_pci22_init(struct pci_dev *dev);
+static inline void pci_vpd_release(struct pci_dev *dev)
+{
+        if (dev->vpd)
+                dev->vpd->ops->release(dev);
+}
+
 /* PCI /proc functions */
 #ifdef CONFIG_PROC_FS
 extern int pci_proc_attach_device(struct pci_dev *dev);
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 284ef392c3ea..c2e99fd87faf 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -794,6 +794,7 @@ static void pci_release_dev(struct device *dev)
         struct pci_dev *pci_dev;
 
         pci_dev = to_pci_dev(dev);
+        pci_vpd_release(pci_dev);
         kfree(pci_dev);
 }
 
@@ -933,6 +934,8 @@ pci_scan_device(struct pci_bus *bus, int devfn)
                 return NULL;
         }
 
+        pci_vpd_pci22_init(dev);
+
         return dev;
 }
 
diff --git a/include/linux/pci.h b/include/linux/pci.h
index e2f46b05cf8b..292491324b01 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -20,6 +20,8 @@
 /* Include the pci register defines */
 #include <linux/pci_regs.h>
 
+struct pci_vpd;
+
 /*
  * The PCI interface treats multi-function devices as independent
  * devices.  The slot/function address of each device is encoded
@@ -206,6 +208,7 @@ struct pci_dev {
 #ifdef CONFIG_PCI_MSI
         struct list_head msi_list;
 #endif
+        struct pci_vpd *vpd;
 };
 
 extern struct pci_dev *alloc_pci_dev(void);