Commit b439b1d4 authored by Tejun Heo's avatar Tejun Heo Committed by Jesse Barnes
Browse files

PCI: pci-stub: add pci_stub.ids parameter 



Add ids module parameter which allows specifying initial IDs for the
pci-stub driver.  When built into the kernel, pci-stub is linked
before any real pci drivers and by setting up IDs from initialization
it can prevent built-in drivers from attaching to specific devices.

While at it, make pci_stub_probe() print out about devices it grabbed
to weed out "but my controller isn't being probed" bug reports.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent 9dba910e

drivers/pci/pci-stub.c

+44 −1
Original line number Diff line number Diff line
@@ -19,8 +19,16 @@ 
#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_printk(KERN_INFO, &dev->dev, "claimed by stub\n");

	return 0;

}
@@ -32,7 +40,42 @@ static struct pci_driver stub_driver = { 


static int __init pci_stub_init(void)

{

	return pci_register_driver(&stub_driver);

	char *p, *id;

	int rc;



	rc = pci_register_driver(&stub_driver);

	if (rc)

		return rc;



	/* 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;



		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)

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