PCI: add interface to set visible size of VPD

The VPD on all devices may not be 32K. Unfortunately, there is no
generic way to find the size, so this adds a simple API hook
to reset it.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>

2 files changed, 24 insertions, 0 deletions

diff --git a/drivers/pci/access.c b/drivers/pci/access.c
index 86ec4ad44bcd..381444794778 100644
--- a/drivers/pci/access.c
+++ b/drivers/pci/access.c
@@ -340,6 +340,29 @@ int pci_vpd_pci22_init(struct pci_dev *dev)
 }
 
 /**
+ * pci_vpd_truncate - Set available Vital Product Data size
+ * @dev:        pci device struct
+ * @size:       available memory in bytes
+ *
+ * Adjust size of available VPD area.
+ */
+int pci_vpd_truncate(struct pci_dev *dev, size_t size)
+{
+        if (!dev->vpd)
+                return -EINVAL;
+
+        /* limited by the access method */
+        if (size > dev->vpd->len)
+                return -EINVAL;
+
+        dev->vpd->len = size;
+        dev->vpd->attr->size = size;
+
+        return 0;
+}
+EXPORT_SYMBOL(pci_vpd_truncate);
+
+/**
  * pci_block_user_cfg_access - Block userspace PCI config reads/writes
  * @dev:        pci device struct
  *
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 76079e106895..7cbecef19bb6 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -690,6 +690,7 @@ int pci_bus_find_capability(struct pci_bus *bus, unsigned int devfn, int cap);
 /* Vital product data routines */
 ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf);
 ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf);
+int pci_vpd_truncate(struct pci_dev *dev, size_t size);
 
 /* Helper functions for low-level code (drivers/pci/setup-[bus,res].c) */
 void pci_bus_assign_resources(struct pci_bus *bus);