From: Stephen Hemminger <shemminger@vyatta.com>
Date: Thu, 18 Dec 2008 17:17:16 +0000 (-0800)
Subject: PCI: add interface to set visible size of VPD
X-Git-Tag: v2.6.29-rc1~181^2~24
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=db5679437a2b;p=karo-tx-linux.git

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>
---

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
@@ -339,6 +339,29 @@ int pci_vpd_pci22_init(struct pci_dev *dev)
 	return 0;
 }
 
+/**
+ * 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);