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Date: Fri, 13 Jun 2008 22:29:51 +0100
From: Ben Hutchings <bhutchings@...arflare.com>
To: Jesse Barnes <jbarnes@...tuousgeek.org>
Cc: Matthew Wilcox <matthew@....cx>, linux-kernel@...r.kernel.org,
linux-pci@...r.kernel.org
Subject: [PATCH 2/2] PCI: Expose PCI 2.1 VPD through sysfs
PCI 2.1 specifies a way of storing VPD in the expansion ROM. Search for
this and expose it through sysfs in the same way as PCI 2.2 VPD.
Signed-off-by: Ben Hutchings <bhutchings@...arflare.com>
---
drivers/pci/pci-sysfs.c | 2 +-
drivers/pci/pci.h | 1 +
drivers/pci/rom.c | 138 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 140 insertions(+), 1 deletions(-)
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index 271d41c..97ba6a1 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -693,7 +693,7 @@ int __must_check pci_create_sysfs_dev_files (struct pci_dev *pdev)
goto err;
/* If the device has VPD, try to expose it in sysfs. */
- if (pdev->vpd) {
+ if (pdev->vpd || pci_vpd_pci21_init(pdev) == 0) {
attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
if (attr) {
pdev->vpd->attr = attr;
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index 0a497c1..f62ad21 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -30,6 +30,7 @@ struct pci_vpd {
struct bin_attribute *attr; /* descriptor for sysfs VPD entry */
};
+extern int pci_vpd_pci21_init(struct pci_dev *dev);
extern int pci_vpd_pci22_init(struct pci_dev *dev);
static inline void pci_vpd_release(struct pci_dev *dev)
{
diff --git a/drivers/pci/rom.c b/drivers/pci/rom.c
index 94d2afd..f070599 100644
--- a/drivers/pci/rom.c
+++ b/drivers/pci/rom.c
@@ -283,5 +283,143 @@ void pci_cleanup_rom(struct pci_dev *pdev)
}
}
+struct pci_vpd_pci21 {
+ struct pci_vpd base;
+ size_t addr; /* offset within ROM */
+ u16 size;
+};
+
+static int pci_vpd_pci21_read(struct pci_dev *pdev, int pos, int size,
+ char *buf)
+{
+ struct pci_vpd_pci21 *vpd =
+ container_of(pdev->vpd, struct pci_vpd_pci21, base);
+ void __iomem *rom;
+ size_t win_size;
+ int ret;
+ int i;
+
+ if (pos < 0 || pos > (int)vpd->size || size > vpd->size - pos)
+ return -EINVAL;
+
+ rom = __pci_map_rom(pdev, &win_size);
+ if (!rom)
+ return -EIO;
+ if (vpd->addr > win_size || vpd->size > win_size - vpd->addr) {
+ ret = -EIO;
+ goto out_unmap;
+ }
+
+ memcpy_fromio(buf, rom + vpd->addr + pos, size);
+ ret = size;
+
+out_unmap:
+ pci_unmap_rom(pdev, rom);
+ return ret;
+}
+
+static int pci_vpd_pci21_write(struct pci_dev *pdev, int pos, int size,
+ const char *buf)
+{
+ return -EROFS;
+}
+
+static int pci_vpd_pci21_get_size(struct pci_dev *pdev)
+{
+ struct pci_vpd_pci21 *vpd =
+ container_of(pdev->vpd, struct pci_vpd_pci21, base);
+ return vpd->size;
+}
+
+static void pci_vpd_pci21_release(struct pci_dev *pdev)
+{
+ kfree(container_of(pdev->vpd, struct pci_vpd_pci21, base));
+}
+
+static struct pci_vpd_ops pci_vpd_pci21_ops = {
+ .read = pci_vpd_pci21_read,
+ .write = pci_vpd_pci21_write,
+ .get_size = pci_vpd_pci21_get_size,
+ .release = pci_vpd_pci21_release
+};
+
+int pci_vpd_pci21_init(struct pci_dev *pdev)
+{
+ struct pci_vpd_pci21 *vpd;
+ void __iomem *rom, *image, *pds;
+ size_t rom_size, image_size, addr = 0, limit = 0;
+ bool last;
+ int ret;
+
+ if (pci_resource_len(pdev, PCI_ROM_RESOURCE) == 0 &&
+ !(pdev->resource[PCI_ROM_RESOURCE].flags & IORESOURCE_ROM_SHADOW))
+ return -ENODEV;
+
+ rom = __pci_map_rom(pdev, &rom_size);
+ if (!rom)
+ return -ENODEV;
+
+ /* Find first image with VPD */
+ image = rom;
+ for (;;) {
+ image_size = pci_get_rom_image_size(rom, rom_size,
+ image, &last);
+ if (image_size != 0) {
+ pds = image + readw(image + 24);
+ addr = readw(pds + 8);
+ if (addr != 0 && addr < image_size)
+ break;
+ }
+ if (last) {
+ ret = -ENODEV;
+ goto out_unmap;
+ }
+ image += image_size;
+ }
+ addr += image - rom;
+ limit = image - rom + min_t(size_t, image_size, 1 << 16);
+
+ vpd = kzalloc(sizeof(*vpd), GFP_ATOMIC);
+ if (!vpd) {
+ ret = -ENOMEM;
+ goto out_unmap;
+ }
+ vpd->base.ops = &pci_vpd_pci21_ops;
+ vpd->addr = addr;
+ vpd->size = limit - addr; /* in case we can't find an ending tag */
+ pdev->vpd = &vpd->base;
+ ret = 0;
+
+ /* Follow chain of resources to find VPD size. */
+ for (;;) {
+ u8 tag;
+ u16 res_size;
+
+ tag = readb(rom + addr);
+ if (tag & 0x80) {
+ if (addr > limit - 3)
+ break;
+ res_size = readb(rom + addr + 1);
+ res_size += readb(rom + addr + 2) << 8;
+ addr += 3;
+ } else {
+ res_size = tag & 7;
+ addr += 1;
+ if (res_size == 0) {
+ /* Valid ending tag */
+ vpd->size = addr - vpd->addr;
+ break;
+ }
+ }
+ if (addr >= limit - res_size)
+ break;
+ addr += res_size;
+ }
+
+out_unmap:
+ pci_unmap_rom(pdev, rom);
+ return ret;
+}
+
EXPORT_SYMBOL(pci_map_rom);
EXPORT_SYMBOL(pci_unmap_rom);
--
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
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