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vfio-pci: Generalize setup of simple eventfds

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We want another single vector IRQ index to support signaling of
the device request to userspace.  Generalize the error reporting
IRQ index to avoid code duplication.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Alex Williamson 2015-02-06 15:05:07 -07:00
parent 13060b64b8
commit cac80d6e38
1 changed files with 29 additions and 15 deletions
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44
drivers/vfio/pci/vfio_pci_intrs.c
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@ -763,46 +763,60 @@ 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)
static int vfio_pci_set_ctx_trigger_single(struct eventfd_ctx **ctx,
uint32_t flags, void *data)
{
int32_t fd = *(int32_t *)data;
if ((index != VFIO_PCI_ERR_IRQ_INDEX) ||
!(flags & VFIO_IRQ_SET_DATA_TYPE_MASK))
if (!(flags & VFIO_IRQ_SET_DATA_TYPE_MASK))
return -EINVAL;
/* DATA_NONE/DATA_BOOL enables loopback testing */
if (flags & VFIO_IRQ_SET_DATA_NONE) {
if (vdev->err_trigger)
eventfd_signal(vdev->err_trigger, 1);
if (*ctx)
eventfd_signal(*ctx, 1);
return 0;
} else if (flags & VFIO_IRQ_SET_DATA_BOOL) {
uint8_t trigger = *(uint8_t *)data;
if (trigger && vdev->err_trigger)
eventfd_signal(vdev->err_trigger, 1);
if (trigger && *ctx)
eventfd_signal(*ctx, 1);
return 0;
}
/* Handle SET_DATA_EVENTFD */
if (fd == -1) {
if (vdev->err_trigger)
eventfd_ctx_put(vdev->err_trigger);
vdev->err_trigger = NULL;
if (*ctx)
eventfd_ctx_put(*ctx);
*ctx = NULL;
return 0;
} else if (fd >= 0) {
struct eventfd_ctx *efdctx;
efdctx = eventfd_ctx_fdget(fd);
if (IS_ERR(efdctx))
return PTR_ERR(efdctx);
if (vdev->err_trigger)
eventfd_ctx_put(vdev->err_trigger);
vdev->err_trigger = efdctx;
if (*ctx)
eventfd_ctx_put(*ctx);
*ctx = efdctx;
return 0;
} else
return -EINVAL;
}
static int vfio_pci_set_err_trigger(struct vfio_pci_device *vdev,
unsigned index, unsigned start,
unsigned count, uint32_t flags, void *data)
{
if (index != VFIO_PCI_ERR_IRQ_INDEX)
return -EINVAL;
/*
* We should sanitize start & count, but that wasn't caught
* originally, so this IRQ index must forever ignore them :-(
*/
return vfio_pci_set_ctx_trigger_single(&vdev->err_trigger, flags, data);
}
int vfio_pci_set_irqs_ioctl(struct vfio_pci_device *vdev, uint32_t flags,
unsigned index, unsigned start, unsigned count,
void *data)