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authorVijay Mohan Pandarathil <vijaymohan.pandarathil@hp.com>2013-03-11 19:31:22 +0400
committerAlex Williamson <alex.williamson@redhat.com>2013-03-11 19:31:22 +0400
commitdad9f8972e04cd081a028d8fb1249d746d97fc03 (patch)
tree8f3f6bbfa41f3a60853007e33846d6fac2b139ea /drivers/vfio/pci/vfio_pci_intrs.c
parent44f507163d9e51238458ee6904b4d71fb0723723 (diff)
downloadlinux-dad9f8972e04cd081a028d8fb1249d746d97fc03.tar.xz
VFIO-AER: Vfio-pci driver changes for supporting AER
- New VFIO_SET_IRQ ioctl option to pass the eventfd that is signaled when an error occurs in the vfio_pci_device - Register pci_error_handler for the vfio_pci driver - When the device encounters an error, the error handler registered by the vfio_pci driver gets invoked by the AER infrastructure - In the error handler, signal the eventfd registered for the device. - This results in the qemu eventfd handler getting invoked and appropriate action taken for the guest. Signed-off-by: Vijay Mohan Pandarathil <vijaymohan.pandarathil@hp.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/vfio/pci/vfio_pci_intrs.c')
-rw-r--r--drivers/vfio/pci/vfio_pci_intrs.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/drivers/vfio/pci/vfio_pci_intrs.c b/drivers/vfio/pci/vfio_pci_intrs.c
index 3639371fa697..b84bf2210a91 100644
--- a/drivers/vfio/pci/vfio_pci_intrs.c
+++ b/drivers/vfio/pci/vfio_pci_intrs.c
@@ -745,6 +745,63 @@ static int vfio_pci_set_msi_trigger(struct vfio_pci_device *vdev,
return 0;
}
+static int vfio_pci_set_err_trigger(struct vfio_pci_device *vdev,
+ unsigned index, unsigned start,
+ unsigned count, uint32_t flags, void *data)
+{
+ int32_t fd = *(int32_t *)data;
+ struct pci_dev *pdev = vdev->pdev;
+
+ if ((index != VFIO_PCI_ERR_IRQ_INDEX) ||
+ !(flags & VFIO_IRQ_SET_DATA_TYPE_MASK))
+ return -EINVAL;
+
+ /*
+ * device_lock synchronizes setting and checking of
+ * err_trigger. The vfio_pci_aer_err_detected() is also
+ * called with device_lock held.
+ */
+
+ /* DATA_NONE/DATA_BOOL enables loopback testing */
+
+ if (flags & VFIO_IRQ_SET_DATA_NONE) {
+ device_lock(&pdev->dev);
+ if (vdev->err_trigger)
+ eventfd_signal(vdev->err_trigger, 1);
+ device_unlock(&pdev->dev);
+ return 0;
+ } else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
+ uint8_t trigger = *(uint8_t *)data;
+ device_lock(&pdev->dev);
+ if (trigger && vdev->err_trigger)
+ eventfd_signal(vdev->err_trigger, 1);
+ device_unlock(&pdev->dev);
+ return 0;
+ }
+
+ /* Handle SET_DATA_EVENTFD */
+
+ if (fd == -1) {
+ device_lock(&pdev->dev);
+ if (vdev->err_trigger)
+ eventfd_ctx_put(vdev->err_trigger);
+ vdev->err_trigger = NULL;
+ device_unlock(&pdev->dev);
+ return 0;
+ } else if (fd >= 0) {
+ struct eventfd_ctx *efdctx;
+ efdctx = eventfd_ctx_fdget(fd);
+ if (IS_ERR(efdctx))
+ return PTR_ERR(efdctx);
+ device_lock(&pdev->dev);
+ if (vdev->err_trigger)
+ eventfd_ctx_put(vdev->err_trigger);
+ vdev->err_trigger = efdctx;
+ device_unlock(&pdev->dev);
+ return 0;
+ } else
+ return -EINVAL;
+}
int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev, uint32_t flags,
unsigned index, unsigned start, unsigned count,
void *data)
@@ -779,6 +836,13 @@ int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev, uint32_t flags,
break;
}
break;
+ case VFIO_PCI_ERR_IRQ_INDEX:
+ switch (flags & VFIO_IRQ_SET_ACTION_TYPE_MASK) {
+ case VFIO_IRQ_SET_ACTION_TRIGGER:
+ if (pci_is_pcie(vdev->pdev))
+ func = vfio_pci_set_err_trigger;
+ break;
+ }
}
if (!func)