File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/drivers/pci/pci-stub.c b/drivers/pci/pci-stub.c
new file mode 100644
index 0000000..886fb35
--- /dev/null
+++ b/drivers/pci/pci-stub.c
@@ -0,0 +1,97 @@
+/* pci-stub - simple stub driver to reserve a pci device
+ *
+ * Copyright (C) 2008 Red Hat, Inc.
+ * Author:
+ * Chris Wright
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ *
+ * 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)
+{
+ dev_info(&dev->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) {
+ printk(KERN_WARNING
+ "pci-stub: invalid id string \"%s\"\n", id);
+ continue;
+ }
+
+ printk(KERN_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)
+ printk(KERN_WARNING
+ "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>");