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xen/pciback: support driver_override

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Support the driver_override scheme introduced with commit 782a985d7a
("PCI: Introduce new device binding path using pci_dev.driver_override")

As pcistub_probe() is called for all devices (it has to check for a
match based on the slot address rather than device type) it has to
check for driver_override set to "pciback" itself.

Up to now for assigning a pci device to pciback you need something like:

echo 0000:07:10.0 > /sys/bus/pci/devices/0000\:07\:10.0/driver/unbind
echo 0000:07:10.0 > /sys/bus/pci/drivers/pciback/new_slot
echo 0000:07:10.0 > /sys/bus/pci/drivers_probe

while with the patch you can use the same mechanism as for similar
drivers like pci-stub and vfio-pci:

echo pciback > /sys/bus/pci/devices/0000\:07\:10.0/driver_override
echo 0000:07:10.0 > /sys/bus/pci/devices/0000\:07\:10.0/driver/unbind
echo 0000:07:10.0 > /sys/bus/pci/drivers_probe

So e.g. libvirt doesn't need special handling for pciback.

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Juergen Gross 2016-09-22 10:45:41 +02:00 committed by David Vrabel
parent 9f8bee9c98
commit b057878b2a
1 changed files with 29 additions and 7 deletions
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36
drivers/xen/xen-pciback/pci_stub.c
View File

@ -25,6 +25,8 @@
#include "conf_space.h"
#include "conf_space_quirks.h"
#define PCISTUB_DRIVER_NAME "pciback"
static char *pci_devs_to_hide;
wait_queue_head_t xen_pcibk_aer_wait_queue;
/*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops,
@ -508,15 +510,18 @@ static void pcistub_device_id_add_list(struct pcistub_device_id *new,
kfree(new);
}
static int pcistub_seize(struct pci_dev *dev)
static int pcistub_seize(struct pci_dev *dev,
struct pcistub_device_id *pci_dev_id)
{
struct pcistub_device *psdev;
unsigned long flags;
int err = 0;
psdev = pcistub_device_alloc(dev);
if (!psdev)
if (!psdev) {
kfree(pci_dev_id);
return -ENOMEM;
}
spin_lock_irqsave(&pcistub_devices_lock, flags);
@ -537,8 +542,12 @@ static int pcistub_seize(struct pci_dev *dev)
spin_unlock_irqrestore(&pcistub_devices_lock, flags);
if (err)
if (err) {
kfree(pci_dev_id);
pcistub_device_put(psdev);
} else if (pci_dev_id)
pcistub_device_id_add_list(pci_dev_id, pci_domain_nr(dev->bus),
dev->bus->number, dev->devfn);
return err;
}
@ -547,11 +556,16 @@ static int pcistub_seize(struct pci_dev *dev)
* other functions that take the sysfs lock. */
static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
{
int err = 0;
int err = 0, match;
struct pcistub_device_id *pci_dev_id = NULL;
dev_dbg(&dev->dev, "probing...\n");
if (pcistub_match(dev)) {
match = pcistub_match(dev);
if ((dev->driver_override &&
!strcmp(dev->driver_override, PCISTUB_DRIVER_NAME)) ||
match) {
if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL
&& dev->hdr_type != PCI_HEADER_TYPE_BRIDGE) {
@ -562,8 +576,16 @@ static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
goto out;
}
if (!match) {
pci_dev_id = kmalloc(sizeof(*pci_dev_id), GFP_ATOMIC);
if (!pci_dev_id) {
err = -ENOMEM;
goto out;
}
}
dev_info(&dev->dev, "seizing device\n");
err = pcistub_seize(dev);
err = pcistub_seize(dev, pci_dev_id);
} else
/* Didn't find the device */
err = -ENODEV;
@ -975,7 +997,7 @@ static const struct pci_error_handlers xen_pcibk_error_handler = {
static struct pci_driver xen_pcibk_pci_driver = {
/* The name should be xen_pciback, but until the tools are updated
* we will keep it as pciback. */
.name = "pciback",
.name = PCISTUB_DRIVER_NAME,
.id_table = pcistub_ids,
.probe = pcistub_probe,
.remove = pcistub_remove,