PCI: Expose PCI VPD through sysfs

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>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index eabeb1f2ec9..0a497c1b422 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);