vfio/common: Introduce vfio_set_irq_signaling helper

The code used to assign an interrupt index/subindex to an
eventfd is duplicated many times. Let's introduce an helper that
allows to set/unset the signaling for an ACTION_TRIGGER,
ACTION_MASK or ACTION_UNMASK action.

In the error message, we now use errno in case of any
VFIO_DEVICE_SET_IRQS ioctl failure.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

1 files changed, 23 insertions, 45 deletions

diff --git a/hw/vfio/platform.c b/hw/vfio/platform.c
index ad29725955..622e609fb4 100644
--- a/hw/vfio/platform.c
+++ b/hw/vfio/platform.c
@@ -107,26 +107,19 @@ static int vfio_set_trigger_eventfd(VFIOINTp *intp,
                                     eventfd_user_side_handler_t handler)
 {
     VFIODevice *vbasedev = &intp->vdev->vbasedev;
-    struct vfio_irq_set *irq_set;
-    int argsz, ret;
-    int32_t *pfd;
-
-    argsz = sizeof(*irq_set) + sizeof(*pfd);
-    irq_set = g_malloc0(argsz);
-    irq_set->argsz = argsz;
-    irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
-    irq_set->index = intp->pin;
-    irq_set->start = 0;
-    irq_set->count = 1;
-    pfd = (int32_t *)&irq_set->data;
-    *pfd = event_notifier_get_fd(intp->interrupt);
-    qemu_set_fd_handler(*pfd, (IOHandler *)handler, NULL, intp);
-    ret = ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
-    if (ret < 0) {
-        error_report("vfio: Failed to set trigger eventfd: %m");
-        qemu_set_fd_handler(*pfd, NULL, NULL, NULL);
-    }
-    g_free(irq_set);
+    int32_t fd = event_notifier_get_fd(intp->interrupt);
+    Error *err = NULL;
+    int ret;
+
+    qemu_set_fd_handler(fd, (IOHandler *)handler, NULL, intp);
+
+    ret = vfio_set_irq_signaling(vbasedev, intp->pin, 0,
+                                 VFIO_IRQ_SET_ACTION_TRIGGER, fd, &err);
+    if (ret) {
+        error_reportf_err(err, VFIO_MSG_PREFIX, vbasedev->name);
+        qemu_set_fd_handler(fd, NULL, NULL, NULL);
+    }
+
     return ret;
 }
 
@@ -331,7 +324,6 @@ static void vfio_platform_eoi(VFIODevice *vbasedev)
 
 static void vfio_start_eventfd_injection(SysBusDevice *sbdev, qemu_irq irq)
 {
-    int ret;
     VFIOPlatformDevice *vdev = VFIO_PLATFORM_DEVICE(sbdev);
     VFIOINTp *intp;
 
@@ -342,10 +334,7 @@ static void vfio_start_eventfd_injection(SysBusDevice *sbdev, qemu_irq irq)
     }
     assert(intp);
 
-    ret = vfio_set_trigger_eventfd(intp, vfio_intp_interrupt);
-    if (ret) {
-        error_report("vfio: failed to start eventfd signaling for IRQ %d: %m",
-                     intp->pin);
+    if (vfio_set_trigger_eventfd(intp, vfio_intp_interrupt)) {
         abort();
     }
 }
@@ -362,25 +351,16 @@ static void vfio_start_eventfd_injection(SysBusDevice *sbdev, qemu_irq irq)
  */
 static int vfio_set_resample_eventfd(VFIOINTp *intp)
 {
+    int32_t fd = event_notifier_get_fd(intp->unmask);
     VFIODevice *vbasedev = &intp->vdev->vbasedev;
-    struct vfio_irq_set *irq_set;
-    int argsz, ret;
-    int32_t *pfd;
-
-    argsz = sizeof(*irq_set) + sizeof(*pfd);
-    irq_set = g_malloc0(argsz);
-    irq_set->argsz = argsz;
-    irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_UNMASK;
-    irq_set->index = intp->pin;
-    irq_set->start = 0;
-    irq_set->count = 1;
-    pfd = (int32_t *)&irq_set->data;
-    *pfd = event_notifier_get_fd(intp->unmask);
-    qemu_set_fd_handler(*pfd, NULL, NULL, NULL);
-    ret = ioctl(vbasedev->fd, VFIO_DEVICE_SET_IRQS, irq_set);
-    g_free(irq_set);
-    if (ret < 0) {
-        error_report("vfio: Failed to set resample eventfd: %m");
+    Error *err = NULL;
+    int ret;
+
+    qemu_set_fd_handler(fd, NULL, NULL, NULL);
+    ret = vfio_set_irq_signaling(vbasedev, intp->pin, 0,
+                                 VFIO_IRQ_SET_ACTION_UNMASK, fd, &err);
+    if (ret) {
+        error_reportf_err(err, VFIO_MSG_PREFIX, vbasedev->name);
     }
     return ret;
 }
@@ -436,8 +416,6 @@ static void vfio_start_irqfd_injection(SysBusDevice *sbdev, qemu_irq irq)
     return;
 fail_vfio:
     kvm_irqchip_remove_irqfd_notifier(kvm_state, intp->interrupt, irq);
-    error_report("vfio: failed to start eventfd signaling for IRQ %d: %m",
-                 intp->pin);
     abort();
 fail_irqfd:
     vfio_start_eventfd_injection(sbdev, irq);