Similar to DRM_VMW_EVENT_FENCE_SIGNALED. Sends a pollable event
to the DRM file descriptor when a fence on a specific ring is
signaled.
One difference is the event is not exposed via the UAPI -- this is
because host responses are on a shared memory buffer of type
BLOB_MEM_GUEST [this is the common way to receive responses with
virtgpu]. As such, there is no context specific read(..)
implementation either -- just a poll(..) implementation.
Signed-off-by: Gurchetan Singh <gurchetansingh@xxxxxxxxxxxx>
Acked-by: Nicholas Verne <nverne@xxxxxxxxxxxx>
---
drivers/gpu/drm/virtio/virtgpu_drv.c | 43 +++++++++++++++++++++++++-
drivers/gpu/drm/virtio/virtgpu_drv.h | 7 +++++
drivers/gpu/drm/virtio/virtgpu_fence.c | 10 ++++++
drivers/gpu/drm/virtio/virtgpu_ioctl.c | 34 ++++++++++++++++++++
4 files changed, 93 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/virtgpu_drv.c
index 9d963f1fda8f..749db18dcfa2 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.c
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.c
@@ -29,6 +29,8 @@
#include <linux/module.h>
#include <linux/console.h>
#include <linux/pci.h>
+#include <linux/poll.h>
+#include <linux/wait.h>
#include <drm/drm.h>
#include <drm/drm_aperture.h>
@@ -155,6 +157,35 @@ static void virtio_gpu_config_changed(struct virtio_device *vdev)
schedule_work(&vgdev->config_changed_work);
}
+static __poll_t virtio_gpu_poll(struct file *filp,
+ struct poll_table_struct *wait)
+{
+ struct drm_file *drm_file = filp->private_data;
+ struct virtio_gpu_fpriv *vfpriv = drm_file->driver_priv;
+ struct drm_device *dev = drm_file->minor->dev;
+ struct drm_pending_event *e = NULL;
+ __poll_t mask = 0;
+
+ if (!vfpriv->ring_idx_mask)
+ return drm_poll(filp, wait);
+
+ poll_wait(filp, &drm_file->event_wait, wait);
+
+ if (!list_empty(&drm_file->event_list)) {
+ spin_lock_irq(&dev->event_lock);
+ e = list_first_entry(&drm_file->event_list,
+ struct drm_pending_event, link);
+ drm_file->event_space += e->event->length;
+ list_del(&e->link);
+ spin_unlock_irq(&dev->event_lock);
+
+ kfree(e);
+ mask |= EPOLLIN | EPOLLRDNORM;
+ }
+
+ return mask;
+}
+
static struct virtio_device_id id_table[] = {
{ VIRTIO_ID_GPU, VIRTIO_DEV_ANY_ID },
{ 0 },
@@ -194,7 +225,17 @@ MODULE_AUTHOR("Dave Airlie <airlied@xxxxxxxxxx>");
MODULE_AUTHOR("Gerd Hoffmann <kraxel@xxxxxxxxxx>");
MODULE_AUTHOR("Alon Levy");
-DEFINE_DRM_GEM_FOPS(virtio_gpu_driver_fops);
+static const struct file_operations virtio_gpu_driver_fops = {
+ .owner = THIS_MODULE,
+ .open = drm_open,
+ .release = drm_release,
+ .unlocked_ioctl = drm_ioctl,
+ .compat_ioctl = drm_compat_ioctl,
+ .poll = virtio_gpu_poll,
+ .read = drm_read,
+ .llseek = noop_llseek,
+ .mmap = drm_gem_mmap
+};
static const struct drm_driver driver = {
.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_RENDER | DRIVER_ATOMIC,
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index cb60d52c2bd1..e0265fe74aa5 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -138,11 +138,18 @@ struct virtio_gpu_fence_driver {
spinlock_t lock;
};
+#define VIRTGPU_EVENT_FENCE_SIGNALED_INTERNAL 0x10000000
+struct virtio_gpu_fence_event {
+ struct drm_pending_event base;
+ struct drm_event event;
+};
+
struct virtio_gpu_fence {
struct dma_fence f;
uint32_t ring_idx;
uint64_t fence_id;
bool emit_fence_info;
+ struct virtio_gpu_fence_event *e;
struct virtio_gpu_fence_driver *drv;
struct list_head node;
};
diff --git a/drivers/gpu/drm/virtio/virtgpu_fence.c b/drivers/gpu/drm/virtio/virtgpu_fence.c
index 98a00c1e654d..f28357dbde35 100644
--- a/drivers/gpu/drm/virtio/virtgpu_fence.c
+++ b/drivers/gpu/drm/virtio/virtgpu_fence.c
@@ -152,11 +152,21 @@ void virtio_gpu_fence_event_process(struct virtio_gpu_device *vgdev,
continue;
dma_fence_signal_locked(&curr->f);
+ if (curr->e) {
+ drm_send_event(vgdev->ddev, &curr->e->base);
+ curr->e = NULL;
+ }
+
list_del(&curr->node);
dma_fence_put(&curr->f);
}
dma_fence_signal_locked(&signaled->f);
+ if (signaled->e) {
+ drm_send_event(vgdev->ddev, &signaled->e->base);
+ signaled->e = NULL;
+ }
+
list_del(&signaled->node);
dma_fence_put(&signaled->f);
break;
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index be7b22a03884..fdaa7f3d9eeb 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -38,6 +38,36 @@
VIRTGPU_BLOB_FLAG_USE_SHAREABLE | \
VIRTGPU_BLOB_FLAG_USE_CROSS_DEVICE)
+static int virtio_gpu_fence_event_create(struct drm_device *dev,
+ struct drm_file *file,
+ struct virtio_gpu_fence *fence,
+ uint32_t ring_idx)
+{
+ struct virtio_gpu_fpriv *vfpriv = file->driver_priv;
+ struct virtio_gpu_fence_event *e = NULL;
+ int ret;
+
+ if (!(vfpriv->ring_idx_mask & (1 << ring_idx)))
+ return 0;
+
+ e = kzalloc(sizeof(*e), GFP_KERNEL);
+ if (!e)
+ return -ENOMEM;
+
+ e->event.type = VIRTGPU_EVENT_FENCE_SIGNALED_INTERNAL;
+ e->event.length = sizeof(e->event);
+
+ ret = drm_event_reserve_init(dev, file, &e->base, &e->event);
+ if (ret)
+ goto free;
+
+ fence->e = e;
+ return 0;
+free:
+ kfree(e);
+ return ret;
+}
+
/* Must be called with &virtio_gpu_fpriv.struct_mutex held. */
static void virtio_gpu_create_context_locked(struct virtio_gpu_device *vgdev,
struct virtio_gpu_fpriv *vfpriv)
@@ -195,6 +225,10 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
goto out_unresv;
}
+ ret = virtio_gpu_fence_event_create(dev, file, out_fence, ring_idx);
+ if (ret)
+ goto out_unresv;
+
if (out_fence_fd >= 0) {
sync_file = sync_file_create(&out_fence->f);
if (!sync_file) {
--
2.33.0.464.g1972c5931b-goog
