Gerd Hoffmann
2019-Jun-20 06:07 UTC
[PATCH v4 08/12] drm/virtio: rework virtio_gpu_execbuffer_ioctl fencing
Use gem reservation helpers and direct reservation_object_* calls
instead of ttm.
v3: Also attach the array of gem objects to the virtio command buffer,
so we can drop the object references in the completion callback. Needed
because ttm fence helpers grab a reference for us, but gem helpers
don't.
Signed-off-by: Gerd Hoffmann <kraxel at redhat.com>
Acked-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
drivers/gpu/drm/virtio/virtgpu_drv.h | 5 ++-
drivers/gpu/drm/virtio/virtgpu_ioctl.c | 62 +++++++++++---------------
drivers/gpu/drm/virtio/virtgpu_vq.c | 16 ++++---
3 files changed, 40 insertions(+), 43 deletions(-)
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h
b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 98d646789d23..65f5ce41c341 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -120,9 +120,9 @@ struct virtio_gpu_vbuffer {
char *resp_buf;
int resp_size;
-
virtio_gpu_resp_cb resp_cb;
+ struct virtio_gpu_object_array *objs;
struct list_head list;
};
@@ -311,7 +311,8 @@ void virtio_gpu_cmd_context_detach_resource(struct
virtio_gpu_device *vgdev,
uint32_t resource_id);
void virtio_gpu_cmd_submit(struct virtio_gpu_device *vgdev,
void *data, uint32_t data_size,
- uint32_t ctx_id, struct virtio_gpu_fence *fence);
+ uint32_t ctx_id, struct virtio_gpu_fence *fence,
+ struct virtio_gpu_object_array *objs);
void virtio_gpu_cmd_transfer_from_host_3d(struct virtio_gpu_device *vgdev,
uint32_t resource_id, uint32_t ctx_id,
uint64_t offset, uint32_t level,
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 5cffd2e54c04..c3901c397b8a 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -105,14 +105,11 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device
*dev, void *data,
struct drm_virtgpu_execbuffer *exbuf = data;
struct virtio_gpu_device *vgdev = dev->dev_private;
struct virtio_gpu_fpriv *vfpriv = drm_file->driver_priv;
- struct drm_gem_object *gobj;
struct virtio_gpu_fence *out_fence;
- struct virtio_gpu_object *qobj;
int ret;
uint32_t *bo_handles = NULL;
void __user *user_bo_handles = NULL;
- struct list_head validate_list;
- struct ttm_validate_buffer *buflist = NULL;
+ struct virtio_gpu_object_array *buflist = NULL;
int i;
struct ww_acquire_ctx ticket;
struct sync_file *sync_file;
@@ -155,15 +152,10 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device
*dev, void *data,
return out_fence_fd;
}
- INIT_LIST_HEAD(&validate_list);
if (exbuf->num_bo_handles) {
-
bo_handles = kvmalloc_array(exbuf->num_bo_handles,
- sizeof(uint32_t), GFP_KERNEL);
- buflist = kvmalloc_array(exbuf->num_bo_handles,
- sizeof(struct ttm_validate_buffer),
- GFP_KERNEL | __GFP_ZERO);
- if (!bo_handles || !buflist) {
+ sizeof(uint32_t), GFP_KERNEL);
+ if (!bo_handles) {
ret = -ENOMEM;
goto out_unused_fd;
}
@@ -175,25 +167,22 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device
*dev, void *data,
goto out_unused_fd;
}
- for (i = 0; i < exbuf->num_bo_handles; i++) {
- gobj = drm_gem_object_lookup(drm_file, bo_handles[i]);
- if (!gobj) {
- ret = -ENOENT;
- goto out_unused_fd;
- }
-
- qobj = gem_to_virtio_gpu_obj(gobj);
- buflist[i].bo = &qobj->tbo;
-
- list_add(&buflist[i].head, &validate_list);
+ buflist = virtio_gpu_array_from_handles(drm_file, bo_handles,
+ exbuf->num_bo_handles);
+ if (!buflist) {
+ ret = -ENOENT;
+ goto out_unused_fd;
}
kvfree(bo_handles);
bo_handles = NULL;
}
- ret = virtio_gpu_object_list_validate(&ticket, &validate_list);
- if (ret)
- goto out_free;
+ if (buflist) {
+ ret = drm_gem_lock_reservations(buflist->objs, buflist->nents,
+ &ticket);
+ if (ret)
+ goto out_unused_fd;
+ }
buf = memdup_user(u64_to_user_ptr(exbuf->command), exbuf->size);
if (IS_ERR(buf)) {
@@ -219,25 +208,26 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device
*dev, void *data,
fd_install(out_fence_fd, sync_file->file);
}
+ if (buflist) {
+ for (i = 0; i < exbuf->num_bo_handles; i++)
+ reservation_object_add_excl_fence(buflist->objs[i]->resv,
+ &out_fence->f);
+ drm_gem_unlock_reservations(buflist->objs, buflist->nents,
+ &ticket);
+ }
+
virtio_gpu_cmd_submit(vgdev, buf, exbuf->size,
- vfpriv->ctx_id, out_fence);
-
- ttm_eu_fence_buffer_objects(&ticket, &validate_list,
&out_fence->f);
-
- /* fence the command bo */
- virtio_gpu_unref_list(&validate_list);
- kvfree(buflist);
+ vfpriv->ctx_id, out_fence, buflist);
return 0;
out_memdup:
kfree(buf);
out_unresv:
- ttm_eu_backoff_reservation(&ticket, &validate_list);
-out_free:
- virtio_gpu_unref_list(&validate_list);
+ drm_gem_unlock_reservations(buflist->objs, buflist->nents, &ticket);
out_unused_fd:
kvfree(bo_handles);
- kvfree(buflist);
+ if (buflist)
+ virtio_gpu_array_put_free(buflist);
if (out_fence_fd >= 0)
put_unused_fd(out_fence_fd);
diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c
b/drivers/gpu/drm/virtio/virtgpu_vq.c
index 6c1a90717535..dc2c2c003200 100644
--- a/drivers/gpu/drm/virtio/virtgpu_vq.c
+++ b/drivers/gpu/drm/virtio/virtgpu_vq.c
@@ -191,7 +191,7 @@ void virtio_gpu_dequeue_ctrl_func(struct work_struct *work)
} while (!virtqueue_enable_cb(vgdev->ctrlq.vq));
spin_unlock(&vgdev->ctrlq.qlock);
- list_for_each_entry_safe(entry, tmp, &reclaim_list, list) {
+ list_for_each_entry(entry, &reclaim_list, list) {
resp = (struct virtio_gpu_ctrl_hdr *)entry->resp_buf;
trace_virtio_gpu_cmd_response(vgdev->ctrlq.vq, resp);
@@ -218,14 +218,18 @@ void virtio_gpu_dequeue_ctrl_func(struct work_struct
*work)
}
if (entry->resp_cb)
entry->resp_cb(vgdev, entry);
-
- list_del(&entry->list);
- free_vbuf(vgdev, entry);
}
wake_up(&vgdev->ctrlq.ack_queue);
if (fence_id)
virtio_gpu_fence_event_process(vgdev, fence_id);
+
+ list_for_each_entry_safe(entry, tmp, &reclaim_list, list) {
+ if (entry->objs)
+ virtio_gpu_array_put_free(entry->objs);
+ list_del(&entry->list);
+ free_vbuf(vgdev, entry);
+ }
}
void virtio_gpu_dequeue_cursor_func(struct work_struct *work)
@@ -939,7 +943,8 @@ void virtio_gpu_cmd_transfer_from_host_3d(struct
virtio_gpu_device *vgdev,
void virtio_gpu_cmd_submit(struct virtio_gpu_device *vgdev,
void *data, uint32_t data_size,
- uint32_t ctx_id, struct virtio_gpu_fence *fence)
+ uint32_t ctx_id, struct virtio_gpu_fence *fence,
+ struct virtio_gpu_object_array *objs)
{
struct virtio_gpu_cmd_submit *cmd_p;
struct virtio_gpu_vbuffer *vbuf;
@@ -949,6 +954,7 @@ void virtio_gpu_cmd_submit(struct virtio_gpu_device *vgdev,
vbuf->data_buf = data;
vbuf->data_size = data_size;
+ vbuf->objs = objs;
cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_SUBMIT_3D);
cmd_p->hdr.ctx_id = cpu_to_le32(ctx_id);
--
2.18.1
Chia-I Wu
2019-Jun-27 01:32 UTC
[PATCH v4 08/12] drm/virtio: rework virtio_gpu_execbuffer_ioctl fencing
On Wed, Jun 19, 2019 at 11:08 PM Gerd Hoffmann <kraxel at redhat.com> wrote:> > Use gem reservation helpers and direct reservation_object_* calls > instead of ttm. > > v3: Also attach the array of gem objects to the virtio command buffer, > so we can drop the object references in the completion callback. Needed > because ttm fence helpers grab a reference for us, but gem helpers > don't. > > Signed-off-by: Gerd Hoffmann <kraxel at redhat.com> > Acked-by: Daniel Vetter <daniel.vetter at ffwll.ch> > --- > drivers/gpu/drm/virtio/virtgpu_drv.h | 5 ++- > drivers/gpu/drm/virtio/virtgpu_ioctl.c | 62 +++++++++++--------------- > drivers/gpu/drm/virtio/virtgpu_vq.c | 16 ++++--- > 3 files changed, 40 insertions(+), 43 deletions(-) > > diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h > index 98d646789d23..65f5ce41c341 100644 > --- a/drivers/gpu/drm/virtio/virtgpu_drv.h > +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h > @@ -120,9 +120,9 @@ struct virtio_gpu_vbuffer { > > char *resp_buf; > int resp_size; > - > virtio_gpu_resp_cb resp_cb; > > + struct virtio_gpu_object_array *objs;This can use a comment (e.g., objects referenced by the vbuffer)> struct list_head list; > }; > > @@ -311,7 +311,8 @@ void virtio_gpu_cmd_context_detach_resource(struct virtio_gpu_device *vgdev, > uint32_t resource_id); > void virtio_gpu_cmd_submit(struct virtio_gpu_device *vgdev, > void *data, uint32_t data_size, > - uint32_t ctx_id, struct virtio_gpu_fence *fence); > + uint32_t ctx_id, struct virtio_gpu_fence *fence, > + struct virtio_gpu_object_array *objs);Can we keep fence, which is updated, as the last parameter?> void virtio_gpu_cmd_transfer_from_host_3d(struct virtio_gpu_device *vgdev, > uint32_t resource_id, uint32_t ctx_id, > uint64_t offset, uint32_t level, > diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c > index 5cffd2e54c04..c3901c397b8a 100644 > --- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c > +++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c > @@ -105,14 +105,11 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data, > struct drm_virtgpu_execbuffer *exbuf = data; > struct virtio_gpu_device *vgdev = dev->dev_private; > struct virtio_gpu_fpriv *vfpriv = drm_file->driver_priv; > - struct drm_gem_object *gobj; > struct virtio_gpu_fence *out_fence; > - struct virtio_gpu_object *qobj; > int ret; > uint32_t *bo_handles = NULL; > void __user *user_bo_handles = NULL; > - struct list_head validate_list; > - struct ttm_validate_buffer *buflist = NULL; > + struct virtio_gpu_object_array *buflist = NULL; > int i; > struct ww_acquire_ctx ticket; > struct sync_file *sync_file; > @@ -155,15 +152,10 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data, > return out_fence_fd; > } > > - INIT_LIST_HEAD(&validate_list); > if (exbuf->num_bo_handles) { > - > bo_handles = kvmalloc_array(exbuf->num_bo_handles, > - sizeof(uint32_t), GFP_KERNEL); > - buflist = kvmalloc_array(exbuf->num_bo_handles, > - sizeof(struct ttm_validate_buffer), > - GFP_KERNEL | __GFP_ZERO); > - if (!bo_handles || !buflist) { > + sizeof(uint32_t), GFP_KERNEL); > + if (!bo_handles) { > ret = -ENOMEM; > goto out_unused_fd; > } > @@ -175,25 +167,22 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data, > goto out_unused_fd; > } > > - for (i = 0; i < exbuf->num_bo_handles; i++) { > - gobj = drm_gem_object_lookup(drm_file, bo_handles[i]); > - if (!gobj) { > - ret = -ENOENT; > - goto out_unused_fd; > - } > - > - qobj = gem_to_virtio_gpu_obj(gobj); > - buflist[i].bo = &qobj->tbo; > - > - list_add(&buflist[i].head, &validate_list); > + buflist = virtio_gpu_array_from_handles(drm_file, bo_handles, > + exbuf->num_bo_handles); > + if (!buflist) { > + ret = -ENOENT; > + goto out_unused_fd; > } > kvfree(bo_handles); > bo_handles = NULL; > } > > - ret = virtio_gpu_object_list_validate(&ticket, &validate_list); > - if (ret) > - goto out_free; > + if (buflist) { > + ret = drm_gem_lock_reservations(buflist->objs, buflist->nents, > + &ticket); > + if (ret) > + goto out_unused_fd; > + } > > buf = memdup_user(u64_to_user_ptr(exbuf->command), exbuf->size); > if (IS_ERR(buf)) { > @@ -219,25 +208,26 @@ static int virtio_gpu_execbuffer_ioctl(struct drm_device *dev, void *data, > fd_install(out_fence_fd, sync_file->file); > } > > + if (buflist) { > + for (i = 0; i < exbuf->num_bo_handles; i++) > + reservation_object_add_excl_fence(buflist->objs[i]->resv, > + &out_fence->f); > + drm_gem_unlock_reservations(buflist->objs, buflist->nents, > + &ticket); > + }We used to unlock after virtio_gpu_cmd_submit. I guess, the fence is considered signaled (because its seqno is still 0) until after virtio_gpu_cmd_submit. We probably don't want other processes to see the semi-initialized fence.> + > virtio_gpu_cmd_submit(vgdev, buf, exbuf->size, > - vfpriv->ctx_id, out_fence); > - > - ttm_eu_fence_buffer_objects(&ticket, &validate_list, &out_fence->f); > - > - /* fence the command bo */ > - virtio_gpu_unref_list(&validate_list); > - kvfree(buflist); > + vfpriv->ctx_id, out_fence, buflist); > return 0; > > out_memdup: > kfree(buf); > out_unresv: > - ttm_eu_backoff_reservation(&ticket, &validate_list); > -out_free: > - virtio_gpu_unref_list(&validate_list);Keeping out_free to free buflist seems just fine.> + drm_gem_unlock_reservations(buflist->objs, buflist->nents, &ticket); > out_unused_fd: > kvfree(bo_handles); > - kvfree(buflist); > + if (buflist) > + virtio_gpu_array_put_free(buflist); > > if (out_fence_fd >= 0) > put_unused_fd(out_fence_fd); > diff --git a/drivers/gpu/drm/virtio/virtgpu_vq.c b/drivers/gpu/drm/virtio/virtgpu_vq.c > index 6c1a90717535..dc2c2c003200 100644 > --- a/drivers/gpu/drm/virtio/virtgpu_vq.c > +++ b/drivers/gpu/drm/virtio/virtgpu_vq.c > @@ -191,7 +191,7 @@ void virtio_gpu_dequeue_ctrl_func(struct work_struct *work) > } while (!virtqueue_enable_cb(vgdev->ctrlq.vq)); > spin_unlock(&vgdev->ctrlq.qlock); > > - list_for_each_entry_safe(entry, tmp, &reclaim_list, list) { > + list_for_each_entry(entry, &reclaim_list, list) { > resp = (struct virtio_gpu_ctrl_hdr *)entry->resp_buf; > > trace_virtio_gpu_cmd_response(vgdev->ctrlq.vq, resp); > @@ -218,14 +218,18 @@ void virtio_gpu_dequeue_ctrl_func(struct work_struct *work) > } > if (entry->resp_cb) > entry->resp_cb(vgdev, entry); > - > - list_del(&entry->list); > - free_vbuf(vgdev, entry); > } > wake_up(&vgdev->ctrlq.ack_queue); > > if (fence_id) > virtio_gpu_fence_event_process(vgdev, fence_id); > + > + list_for_each_entry_safe(entry, tmp, &reclaim_list, list) { > + if (entry->objs) > + virtio_gpu_array_put_free(entry->objs); > + list_del(&entry->list);We are clearing the list. I guess list_del is not needed.> + free_vbuf(vgdev, entry); > + } > } > > void virtio_gpu_dequeue_cursor_func(struct work_struct *work) > @@ -939,7 +943,8 @@ void virtio_gpu_cmd_transfer_from_host_3d(struct virtio_gpu_device *vgdev, > > void virtio_gpu_cmd_submit(struct virtio_gpu_device *vgdev, > void *data, uint32_t data_size, > - uint32_t ctx_id, struct virtio_gpu_fence *fence) > + uint32_t ctx_id, struct virtio_gpu_fence *fence, > + struct virtio_gpu_object_array *objs) > { > struct virtio_gpu_cmd_submit *cmd_p; > struct virtio_gpu_vbuffer *vbuf; > @@ -949,6 +954,7 @@ void virtio_gpu_cmd_submit(struct virtio_gpu_device *vgdev, > > vbuf->data_buf = data; > vbuf->data_size = data_size; > + vbuf->objs = objs; > > cmd_p->hdr.type = cpu_to_le32(VIRTIO_GPU_CMD_SUBMIT_3D); > cmd_p->hdr.ctx_id = cpu_to_le32(ctx_id); > -- > 2.18.1 > > _______________________________________________ > dri-devel mailing list > dri-devel at lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/dri-devel
Gerd Hoffmann
2019-Jun-28 10:34 UTC
[PATCH v4 08/12] drm/virtio: rework virtio_gpu_execbuffer_ioctl fencing
Hi,> > --- a/drivers/gpu/drm/virtio/virtgpu_drv.h > > +++ b/drivers/gpu/drm/virtio/virtgpu_drv.h > > @@ -120,9 +120,9 @@ struct virtio_gpu_vbuffer { > > > > char *resp_buf; > > int resp_size; > > - > > virtio_gpu_resp_cb resp_cb; > > > > + struct virtio_gpu_object_array *objs; > This can use a comment (e.g., objects referenced by the vbuffer)IMHO this is obvious ...> > void virtio_gpu_cmd_submit(struct virtio_gpu_device *vgdev, > > void *data, uint32_t data_size, > > - uint32_t ctx_id, struct virtio_gpu_fence *fence); > > + uint32_t ctx_id, struct virtio_gpu_fence *fence, > > + struct virtio_gpu_object_array *objs); > Can we keep fence, which is updated, as the last parameter?Fixed.> > + if (buflist) { > > + for (i = 0; i < exbuf->num_bo_handles; i++) > > + reservation_object_add_excl_fence(buflist->objs[i]->resv, > > + &out_fence->f); > > + drm_gem_unlock_reservations(buflist->objs, buflist->nents, > > + &ticket); > > + } > We used to unlock after virtio_gpu_cmd_submit. > > I guess, the fence is considered signaled (because its seqno is still > 0) until after virtio_gpu_cmd_submit. We probably don't want other > processes to see the semi-initialized fence.Good point. Fixed.> > out_memdup: > > kfree(buf); > > out_unresv: > > - ttm_eu_backoff_reservation(&ticket, &validate_list); > > -out_free: > > - virtio_gpu_unref_list(&validate_list); > Keeping out_free to free buflist seems just fine.We don't need the separate label though ...> > + drm_gem_unlock_reservations(buflist->objs, buflist->nents, &ticket); > > out_unused_fd: > > kvfree(bo_handles); > > - kvfree(buflist); > > + if (buflist) > > + virtio_gpu_array_put_free(buflist);... and the buflist is released here if needed. But we need if (buflist) for drm_gem_unlock_reservations too. Fixed.> > - > > - list_del(&entry->list); > > - free_vbuf(vgdev, entry); > > } > > wake_up(&vgdev->ctrlq.ack_queue); > > > > if (fence_id) > > virtio_gpu_fence_event_process(vgdev, fence_id); > > + > > + list_for_each_entry_safe(entry, tmp, &reclaim_list, list) { > > + if (entry->objs) > > + virtio_gpu_array_put_free(entry->objs); > > + list_del(&entry->list); > We are clearing the list. I guess list_del is not needed. > > + free_vbuf(vgdev, entry);This just shuffles around the code. Dropping list_del() is unrelated and should be a separate patch. Beside that I'm not sure it actually can be dropped. free_vbuf() will not kfree() the vbuf but keep it cached in a freelist instead. cheers, Gerd
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