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95 lines
2.3 KiB
95 lines
2.3 KiB
// 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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}; |
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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_LICENSE("GPL"); |
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MODULE_AUTHOR("Chris Wright <[email protected]>");
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