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PCI: Expose PCI VPD through sysfs

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Vital Product Data (VPD) may be exposed by PCI devices in several
ways.  It is generally unsafe to read this information through the
existing interfaces to user-land because of stateful interfaces.

This adds:
- abstract operations for VPD access (struct pci_vpd_ops)
- VPD state information in struct pci_dev (struct pci_vpd)
- an implementation of the VPD access method specified in PCI 2.2
  (in access.c)
- a 'vpd' binary file in sysfs directories for PCI devices with VPD
  operations defined

It adds a probe for PCI 2.2 VPD in pci_scan_device() and release of
VPD state in pci_release_dev().

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ben Hutchings 2008-03-05 16:52:39 +00:00 • committed by Greg Kroah-Hartman
parent 5e0d2a6fc0
commit 94e6108803
6 changed files with 297 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

109
drivers/pci/pci-sysfs.c
View file

@ -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