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xen/pciback: Support pci_reset_function, aka FLR or D3 support.

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We use the __pci_reset_function_locked to perform the action.
Also on attaching ("bind") and detaching ("unbind") we save and
restore the configuration states. When the device is disconnected
from a guest we use the "pci_reset_function" to also reset the
device before being passed to another guest.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Konrad Rzeszutek Wilk 2012-01-12 12:06:47 -05:00 committed by Jesse Barnes
parent 6fbf9e7a90
commit 1160831803
2 changed files with 39 additions and 3 deletions
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41
drivers/xen/xen-pciback/pci_stub.c
View file

@ -85,19 +85,34 @@ static struct pcistub_device *pcistub_device_alloc(struct pci_dev *dev)
static void pcistub_device_release(struct kref *kref)
{
struct pcistub_device *psdev;
struct xen_pcibk_dev_data *dev_data;
psdev = container_of(kref, struct pcistub_device, kref);
dev_data = pci_get_drvdata(psdev->dev);
dev_dbg(&psdev->dev->dev, "pcistub_device_release\n");
xen_unregister_device_domain_owner(psdev->dev);
/* Clean-up the device */
/* Call the reset function which does not take lock as this
* is called from "unbind" which takes a device_lock mutex.
*/
__pci_reset_function_locked(psdev->dev);
if (pci_load_and_free_saved_state(psdev->dev,
&dev_data->pci_saved_state)) {
dev_dbg(&psdev->dev->dev, "Could not reload PCI state\n");
} else
pci_restore_state(psdev->dev);
/* Disable the device */
xen_pcibk_reset_device(psdev->dev);
kfree(dev_data);
pci_set_drvdata(psdev->dev, NULL);
/* Clean-up the device */
xen_pcibk_config_free_dyn_fields(psdev->dev);
xen_pcibk_config_free_dev(psdev->dev);
kfree(pci_get_drvdata(psdev->dev));
pci_set_drvdata(psdev->dev, NULL);
psdev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
pci_dev_put(psdev->dev);
@ -231,7 +246,17 @@ void pcistub_put_pci_dev(struct pci_dev *dev)
/* Cleanup our device
* (so it's ready for the next domain)
*/
/* This is OK - we are running from workqueue context
* and want to inhibit the user from fiddling with 'reset'
*/
pci_reset_function(dev);
pci_restore_state(psdev->dev);
/* This disables the device. */
xen_pcibk_reset_device(found_psdev->dev);
/* And cleanup up our emulated fields. */
xen_pcibk_config_free_dyn_fields(found_psdev->dev);
xen_pcibk_config_reset_dev(found_psdev->dev);
@ -328,6 +353,16 @@ static int __devinit pcistub_init_device(struct pci_dev *dev)
if (err)
goto config_release;
dev_dbg(&dev->dev, "reseting (FLR, D3, etc) the device\n");
__pci_reset_function_locked(dev);
/* We need the device active to save the state. */
dev_dbg(&dev->dev, "save state of device\n");
pci_save_state(dev);
dev_data->pci_saved_state = pci_store_saved_state(dev);
if (!dev_data->pci_saved_state)
dev_err(&dev->dev, "Could not store PCI conf saved state!\n");
/* Now disable the device (this also ensures some private device
* data is setup before we export)
*/

1
drivers/xen/xen-pciback/pciback.h
View file

@ -41,6 +41,7 @@ struct xen_pcibk_device {
struct xen_pcibk_dev_data {
struct list_head config_fields;
struct pci_saved_state *pci_saved_state;
unsigned int permissive:1;
unsigned int warned_on_write:1;
unsigned int enable_intx:1;