// SPDX-License-Identifier: GPL-2.0
|
/*
|
* Simple stub driver to reserve a PCI device
|
*
|
* Copyright (C) 2008 Red Hat, Inc.
|
* Author:
|
* Chris Wright
|
*
|
* Usage is simple, allocate a new id to the stub driver and bind the
|
* device to it. For example:
|
*
|
* # echo "8086 10f5" > /sys/bus/pci/drivers/pci-stub/new_id
|
* # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/e1000e/unbind
|
* # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/pci-stub/bind
|
* # ls -l /sys/bus/pci/devices/0000:00:19.0/driver
|
* .../0000:00:19.0/driver -> ../../../bus/pci/drivers/pci-stub
|
*/
|
|
#include <linux/module.h>
|
#include <linux/pci.h>
|
|
static char ids[1024] __initdata;
|
|
module_param_string(ids, ids, sizeof(ids), 0);
|
MODULE_PARM_DESC(ids, "Initial PCI IDs to add to the stub driver, format is "
|
"\"vendor:device[:subvendor[:subdevice[:class[:class_mask]]]]\""
|
" and multiple comma separated entries can be specified");
|
|
static int pci_stub_probe(struct pci_dev *dev, const struct pci_device_id *id)
|
{
|
pci_info(dev, "claimed by stub\n");
|
return 0;
|
}
|
|
static struct pci_driver stub_driver = {
|
.name = "pci-stub",
|
.id_table = NULL, /* only dynamic id's */
|
.probe = pci_stub_probe,
|
};
|
|
static int __init pci_stub_init(void)
|
{
|
char *p, *id;
|
int rc;
|
|
rc = pci_register_driver(&stub_driver);
|
if (rc)
|
return rc;
|
|
/* no ids passed actually */
|
if (ids[0] == '\0')
|
return 0;
|
|
/* 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("pci-stub: invalid ID string \"%s\"\n", id);
|
continue;
|
}
|
|
pr_info("pci-stub: add %04X:%04X sub=%04X:%04X cls=%08X/%08X\n",
|
vendor, device, subvendor, subdevice, class, class_mask);
|
|
rc = pci_add_dynid(&stub_driver, vendor, device,
|
subvendor, subdevice, class, class_mask, 0);
|
if (rc)
|
pr_warn("pci-stub: failed to add dynamic ID (%d)\n",
|
rc);
|
}
|
|
return 0;
|
}
|
|
static void __exit pci_stub_exit(void)
|
{
|
pci_unregister_driver(&stub_driver);
|
}
|
|
module_init(pci_stub_init);
|
module_exit(pci_stub_exit);
|
|
MODULE_LICENSE("GPL");
|
MODULE_AUTHOR("Chris Wright <chrisw@sous-sol.org>");
|
