Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / pci / pci-stub.c

diff --git a/kernel/drivers/pci/pci-stub.c b/kernel/drivers/pci/pci-stub.c
new file mode 100644 (file)
index 0000000..886fb35
--- /dev/null
+++ b/kernel/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>");