98 lines
2.4 KiB
C
98 lines
2.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Simple stub driver to reserve a PCI device
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*
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* Copyright (C) 2008 Red Hat, Inc.
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* Author:
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* Chris Wright
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*
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* Usage is simple, allocate a new id to the stub driver and bind the
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* device to it. For example:
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*
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* # echo "8086 10f5" > /sys/bus/pci/drivers/pci-stub/new_id
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* # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/e1000e/unbind
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* # echo -n 0000:00:19.0 > /sys/bus/pci/drivers/pci-stub/bind
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* # ls -l /sys/bus/pci/devices/0000:00:19.0/driver
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* .../0000:00:19.0/driver -> ../../../bus/pci/drivers/pci-stub
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*/
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#include <linux/module.h>
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#include <linux/pci.h>
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static char ids[1024] __initdata;
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module_param_string(ids, ids, sizeof(ids), 0);
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MODULE_PARM_DESC(ids, "Initial PCI IDs to add to the stub driver, format is "
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"\"vendor:device[:subvendor[:subdevice[:class[:class_mask]]]]\""
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" and multiple comma separated entries can be specified");
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static int pci_stub_probe(struct pci_dev *dev, const struct pci_device_id *id)
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{
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pci_info(dev, "claimed by stub\n");
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return 0;
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}
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static struct pci_driver stub_driver = {
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.name = "pci-stub",
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.id_table = NULL, /* only dynamic id's */
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.probe = pci_stub_probe,
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.driver_managed_dma = true,
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};
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static int __init pci_stub_init(void)
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{
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char *p, *id;
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int rc;
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rc = pci_register_driver(&stub_driver);
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if (rc)
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return rc;
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/* no ids passed actually */
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if (ids[0] == '\0')
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return 0;
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/* add ids specified in the module parameter */
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p = ids;
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while ((id = strsep(&p, ","))) {
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unsigned int vendor, device, subvendor = PCI_ANY_ID,
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subdevice = PCI_ANY_ID, class = 0, class_mask = 0;
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int fields;
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if (!strlen(id))
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continue;
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fields = sscanf(id, "%x:%x:%x:%x:%x:%x",
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&vendor, &device, &subvendor, &subdevice,
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&class, &class_mask);
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if (fields < 2) {
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pr_warn("pci-stub: invalid ID string \"%s\"\n", id);
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continue;
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}
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pr_info("pci-stub: add %04X:%04X sub=%04X:%04X cls=%08X/%08X\n",
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vendor, device, subvendor, subdevice, class, class_mask);
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rc = pci_add_dynid(&stub_driver, vendor, device,
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subvendor, subdevice, class, class_mask, 0);
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if (rc)
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pr_warn("pci-stub: failed to add dynamic ID (%d)\n",
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rc);
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}
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return 0;
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}
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static void __exit pci_stub_exit(void)
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{
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pci_unregister_driver(&stub_driver);
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}
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module_init(pci_stub_init);
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module_exit(pci_stub_exit);
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MODULE_DESCRIPTION("VM device assignment stub driver");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Chris Wright <chrisw@sous-sol.org>");
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