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Commit 80c7e8cc authored by Alex Williamson's avatar Alex Williamson
Browse files

vfio-pci: Allow PCI IDs to be specified as module options 



This copies the same support from pci-stub for exactly the same
purpose, enabling a set of PCI IDs to be automatically added to the
driver's dynamic ID table at module load time.  The code here is
pretty simple and both vfio-pci and pci-stub are fairly unique in
being meta drivers, capable of attaching to any device, so there's no
attempt made to generalize the code into pci-core.

Signed-off-by: default avatarAlex Williamson <alex.williamson@redhat.com>
parent ecaa1f6a

drivers/vfio/pci/vfio_pci.c

+49 −0
Original line number Diff line number Diff line
@@ -11,6 +11,8 @@ 
 * Author: Tom Lyon, pugs@cisco.com

 */



#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt



#include <linux/device.h>

#include <linux/eventfd.h>

#include <linux/file.h>
@@ -33,6 +35,10 @@ 
#define DRIVER_AUTHOR   "Alex Williamson <alex.williamson@redhat.com>"

#define DRIVER_DESC     "VFIO PCI - User Level meta-driver"



static char ids[1024] __initdata;

module_param_string(ids, ids, sizeof(ids), 0);

MODULE_PARM_DESC(ids, "Initial PCI IDs to add to the vfio driver, format is \"vendor:device[:subvendor[:subdevice[:class[:class_mask]]]]\" and multiple comma separated entries can be specified");



static bool nointxmask;

module_param_named(nointxmask, nointxmask, bool, S_IRUGO | S_IWUSR);

MODULE_PARM_DESC(nointxmask,
@@ -1105,6 +1111,47 @@ static void __exit vfio_pci_cleanup(void) 
	vfio_pci_uninit_perm_bits();

}



static void __init vfio_pci_fill_ids(void)

{

	char *p, *id;

	int rc;



	/* no ids passed actually */

	if (ids[0] == '\0')

		return;



	/* add ids specified in the module parameter */

	p = ids;

	while ((id = strsep(&p, ","))) {

		unsigned int vendor, device, subvendor = PCI_ANY_ID,

			subdevice = PCI_ANY_ID, class = 0, class_mask = 0;

		int fields;



		if (!strlen(id))

			continue;



		fields = sscanf(id, "%x:%x:%x:%x:%x:%x",

				&vendor, &device, &subvendor, &subdevice,

				&class, &class_mask);



		if (fields < 2) {

			pr_warn("invalid id string \"%s\"\n", id);

			continue;

		}



		rc = pci_add_dynid(&vfio_pci_driver, vendor, device,

				   subvendor, subdevice, class, class_mask, 0);

		if (rc)

			pr_warn("failed to add dynamic id [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x (%d)\n",

				vendor, device, subvendor, subdevice,

				class, class_mask, rc);

		else

			pr_info("add [%04hx:%04hx[%04hx:%04hx]] class %#08x/%08x\n",

				vendor, device, subvendor, subdevice,

				class, class_mask);

	}

}



static int __init vfio_pci_init(void)

{

	int ret;
@@ -1119,6 +1166,8 @@ static int __init vfio_pci_init(void) 
	if (ret)

		goto out_driver;



	vfio_pci_fill_ids();



	return 0;



out_driver: