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[PATCH 2/6] virtio: introduce helper function for kick/call device event
From: |
Dongli Zhang |
Subject: |
[PATCH 2/6] virtio: introduce helper function for kick/call device event |
Date: |
Thu, 25 Mar 2021 22:44:29 -0700 |
This is to introduce the helper function for virtio device to kick or
call.
Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com>
---
hw/virtio/virtio.c | 64 ++++++++++++++++++++++++++++++++++++++
include/hw/virtio/virtio.h | 3 ++
2 files changed, 67 insertions(+)
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 07f4e60b30..e081041a75 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -30,6 +30,8 @@
#include "sysemu/runstate.h"
#include "standard-headers/linux/virtio_ids.h"
+/* #define DEBUG_VIRTIO_EVENT */
+
/*
* The alignment to use between consumer and producer parts of vring.
* x86 pagesize again. This is the default, used by transports like PCI
@@ -2572,6 +2574,68 @@ void virtio_notify(VirtIODevice *vdev, VirtQueue *vq)
virtio_irq(vq);
}
+static void virtio_device_event_call(VirtQueue *vq, bool eventfd,
+ Error **errp)
+{
+#ifdef DEBUG_VIRTIO_EVENT
+ printf("The 'call' event is triggered for path=%s, queue=%d, irqfd=%d.\n",
+ object_get_canonical_path(OBJECT(vq->vdev)),
+ vq->queue_index, eventfd);
+#endif
+
+ if (eventfd) {
+ virtio_set_isr(vq->vdev, 0x1);
+ event_notifier_set(&vq->guest_notifier);
+ } else {
+ virtio_irq(vq);
+ }
+}
+
+static void virtio_device_event_kick(VirtQueue *vq, bool eventfd,
+ Error **errp)
+{
+#ifdef DEBUG_VIRTIO_EVENT
+ printf("The 'kick' event is triggered for path=%s, queue=%d.\n",
+ object_get_canonical_path(OBJECT(vq->vdev)), vq->queue_index);
+#endif
+
+ virtio_queue_notify(vq->vdev, virtio_get_queue_index(vq));
+}
+
+typedef void (VirtIOEvent)(VirtQueue *vq, bool eventfd, Error **errp);
+
+static VirtIOEvent *virtio_event_funcs[DEVICE_EVENT_MAX] = {
+ [DEVICE_EVENT_CALL] = virtio_device_event_call,
+ [DEVICE_EVENT_KICK] = virtio_device_event_kick
+};
+
+void virtio_device_event(DeviceState *dev, int event, int queue,
+ bool eventfd, Error **errp)
+{
+ struct VirtIODevice *vdev = VIRTIO_DEVICE(dev);
+ int num = virtio_get_num_queues(vdev);
+ VirtQueue *vq;
+
+ assert(event < DEVICE_EVENT_MAX);
+
+ if (vdev->broken) {
+ error_setg(errp, "Broken device");
+ return;
+ }
+
+ if (queue < 0 || queue >= num) {
+ error_setg(errp, "Invalid queue %d", queue);
+ return;
+ }
+
+ vq = &vdev->vq[queue];
+
+ if (virtio_event_funcs[event])
+ virtio_event_funcs[event](vq, eventfd, errp);
+ else
+ error_setg(errp, "The event is not supported");
+}
+
void virtio_notify_config(VirtIODevice *vdev)
{
if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK))
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index b7ece7a6a8..21bb13ffa6 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -210,6 +210,9 @@ void virtqueue_get_avail_bytes(VirtQueue *vq, unsigned int
*in_bytes,
void virtio_notify_irqfd(VirtIODevice *vdev, VirtQueue *vq);
void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
+void virtio_device_event(DeviceState *dev, int event, int queue,
+ bool eventfd, Error **errp);
+
int virtio_save(VirtIODevice *vdev, QEMUFile *f);
extern const VMStateInfo virtio_vmstate_info;
--
2.17.1
- [PATCH 0/6] Add debug interface to kick/call on purpose, Dongli Zhang, 2021/03/26
- [PATCH 6/6] virtio-net-pci: implement device event interface for kick/call, Dongli Zhang, 2021/03/26
- [PATCH 2/6] virtio: introduce helper function for kick/call device event,
Dongli Zhang <=
- [PATCH 4/6] virtio-scsi-pci: implement device event interface for kick/call, Dongli Zhang, 2021/03/26
- [PATCH 3/6] virtio-blk-pci: implement device event interface for kick/call, Dongli Zhang, 2021/03/26
- [PATCH 1/6] qdev: introduce qapi/hmp command for kick/call event, Dongli Zhang, 2021/03/26
- [PATCH 5/6] vhost-scsi-pci: implement device event interface for kick/call, Dongli Zhang, 2021/03/26
- Re: [PATCH 0/6] Add debug interface to kick/call on purpose, Jason Wang, 2021/03/26