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vfio-pci: Re-order device reset 

Move the device reset to the end of our disable path, the device
should already be stopped from pci_disable_device().  This also allows
us to manipulate the save/restore to avoid the save/reset/restore +
save/restore that we had before.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Alex Williamson 2012-12-07 13:43:50 -07:00
parent 3a1f7041dd
commit 2007722a60
1 changed files with 31 additions and 12 deletions
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43
drivers/vfio/pci/vfio_pci.c
View File

@ -92,9 +92,10 @@ out:
static void vfio_pci_disable(struct vfio_pci_device *vdev) static void vfio_pci_disable(struct vfio_pci_device *vdev)
{ {
struct pci_dev *pdev = vdev->pdev;
int bar; int bar;
pci_disable_device(vdev->pdev); pci_disable_device(pdev);
vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE | vfio_pci_set_irqs_ioctl(vdev, VFIO_IRQ_SET_DATA_NONE |
VFIO_IRQ_SET_ACTION_TRIGGER, VFIO_IRQ_SET_ACTION_TRIGGER,
@ -104,22 +105,40 @@ static void vfio_pci_disable(struct vfio_pci_device *vdev)
vfio_config_free(vdev); vfio_config_free(vdev);
pci_reset_function(vdev->pdev);
if (pci_load_and_free_saved_state(vdev->pdev,
&vdev->pci_saved_state) == 0)
pci_restore_state(vdev->pdev);
else
pr_info("%s: Couldn't reload %s saved state\n",
__func__, dev_name(&vdev->pdev->dev));
for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) { for (bar = PCI_STD_RESOURCES; bar <= PCI_STD_RESOURCE_END; bar++) {
if (!vdev->barmap[bar]) if (!vdev->barmap[bar])
continue; continue;
pci_iounmap(vdev->pdev, vdev->barmap[bar]); pci_iounmap(pdev, vdev->barmap[bar]);
pci_release_selected_regions(vdev->pdev, 1 << bar); pci_release_selected_regions(pdev, 1 << bar);
vdev->barmap[bar] = NULL; vdev->barmap[bar] = NULL;
} }
/*
* If we have saved state, restore it. If we can reset the device,
* even better. Resetting with current state seems better than
* nothing, but saving and restoring current state without reset
* is just busy work.
*/
if (pci_load_and_free_saved_state(pdev, &vdev->pci_saved_state)) {
pr_info("%s: Couldn't reload %s saved state\n",
__func__, dev_name(&pdev->dev));
if (!vdev->reset_works)
return;
pci_save_state(pdev);
}
/*
* Disable INTx and MSI, presumably to avoid spurious interrupts
* during reset. Stolen from pci_reset_function()
*/
pci_write_config_word(pdev, PCI_COMMAND, PCI_COMMAND_INTX_DISABLE);
if (vdev->reset_works)
__pci_reset_function(pdev);
pci_restore_state(pdev);
} }
static void vfio_pci_release(void *device_data) static void vfio_pci_release(void *device_data)