Commit db567943 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by Jesse Barnes
Browse files

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: default avatarStephen Hemminger <shemminger@vyatta.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 287d19ce

drivers/pci/access.c

+23 −0
Original line number Diff line number Diff line
@@ -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

include/linux/pci.h

+1 −0
Original line number Diff line number Diff line
@@ -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);