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Subject[PATCH 3/5] drm/virtio: add in-fences support for explicit synchronization
Date
From: Gustavo Padovan <gustavo.padovan@collabora.com>

When the execbuf call receives an in-fence it will get the dma_fence
related to that fence fd and wait on it before submitting the draw call.

Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.com>
Signed-off-by: Robert Foss <robert.foss@collabora.com>
Suggested-by: Rob Herring <robh@kernel.org>
---
drivers/gpu/drm/virtio/virtgpu_ioctl.c | 43 ++++++++++++++++++++------
1 file changed, 34 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 1af289b28fc4..0368195966aa 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -28,6 +28,7 @@
#include <drm/drmP.h>
#include <drm/virtgpu_drm.h>
#include <drm/ttm/ttm_execbuf_util.h>
+#include <linux/sync_file.h>

#include "virtgpu_drv.h"

@@ -114,6 +115,8 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
struct ttm_validate_buffer *buflist = NULL;
int i;
struct ww_acquire_ctx ticket;
+ struct dma_fence *in_fence = NULL;
+ int in_fence_fd = exbuf->fence_fd;
void *buf;

exbuf->fence_fd = -1;
@@ -124,6 +127,22 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
if ((exbuf->flags & ~VIRTGPU_EXECBUF_FLAGS))
return -EINVAL;

+ if (exbuf->flags & VIRTGPU_EXECBUF_FENCE_FD_IN) {
+ in_fence = sync_file_get_fence(in_fence_fd);
+ if (!in_fence)
+ return -EINVAL;
+
+ /*
+ * Wait if the fence is from a foreign context, or if the fence
+ * array contains any fence from a foreign context.
+ */
+ if (!dma_fence_match_context(in_fence, vgdev->fence_drv.context)) {
+ ret = dma_fence_wait(in_fence, true);
+ if (ret)
+ return ret;
+ }
+ }
+
INIT_LIST_HEAD(&validate_list);
if (exbuf->num_bo_handles) {

@@ -133,26 +152,22 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
sizeof(struct ttm_validate_buffer),
GFP_KERNEL | __GFP_ZERO);
if (!bo_handles || !buflist) {
- kvfree(bo_handles);
- kvfree(buflist);
- return -ENOMEM;
+ ret = -ENOMEM;
+ goto out_in_fence;
}

user_bo_handles = (void __user *)(uintptr_t)exbuf->bo_handles;
if (copy_from_user(bo_handles, user_bo_handles,
exbuf->num_bo_handles * sizeof(uint32_t))) {
ret = -EFAULT;
- kvfree(bo_handles);
- kvfree(buflist);
- return ret;
+ goto out_in_fence;
}

for (i = 0; i < exbuf->num_bo_handles; i++) {
gobj = drm_gem_object_lookup(drm_file, bo_handles[i]);
if (!gobj) {
- kvfree(bo_handles);
- kvfree(buflist);
- return -ENOENT;
+ ret = -ENOENT;
+ goto out_in_fence;
}

qobj = gem_to_virtio_gpu_obj(gobj);
@@ -161,6 +176,7 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
list_add(&buflist[i].head, &validate_list);
}
kvfree(bo_handles);
+ bo_handles = NULL;
}

ret = virtio_gpu_object_list_validate(&ticket, &validate_list);
@@ -180,6 +196,12 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
ret = -ENOMEM;
goto out_unresv;
}
+
+ if (in_fence) {
+ dma_fence_put(in_fence);
+ in_fence = NULL;
+ }
+
virtio_gpu_cmd_submit(vgdev, buf, exbuf->size,
vfpriv->ctx_id, fence);

@@ -195,7 +217,10 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data,
ttm_eu_backoff_reservation(&ticket, &validate_list);
out_free:
virtio_gpu_unref_list(&validate_list);
+out_in_fence:
+ kvfree(bo_handles);
kvfree(buflist);
+ dma_fence_put(in_fence);
return ret;
}

--
2.17.1
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