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Subject[PATCH v3 08/12] drm/virtio: rework virtio_gpu_execbuffer_ioctl fencing
Date
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@redhat.com>
---
drivers/gpu/drm/virtio/virtgpu_drv.h | 6 ++-
drivers/gpu/drm/drm_gem_array_helper.c | 2 +
drivers/gpu/drm/virtio/virtgpu_ioctl.c | 62 +++++++++++---------------
drivers/gpu/drm/virtio/virtgpu_vq.c | 16 ++++---
4 files changed, 43 insertions(+), 43 deletions(-)

diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/virtgpu_drv.h
index 77ac69a8e6cc..573173c35c48 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -33,6 +33,7 @@

#include <drm/drmP.h>
#include <drm/drm_gem.h>
+#include <drm/drm_gem_array_helper.h>
#include <drm/drm_atomic.h>
#include <drm/drm_encoder.h>
#include <drm/drm_fb_helper.h>
@@ -115,9 +116,9 @@ struct virtio_gpu_vbuffer {

char *resp_buf;
int resp_size;
-
virtio_gpu_resp_cb resp_cb;

+ struct drm_gem_object_array *objs;
struct list_head list;
};

@@ -301,7 +302,8 @@ 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 drm_gem_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/drm_gem_array_helper.c b/drivers/gpu/drm/drm_gem_array_helper.c
index d35c77c4a02d..fde6c2e63253 100644
--- a/drivers/gpu/drm/drm_gem_array_helper.c
+++ b/drivers/gpu/drm/drm_gem_array_helper.c
@@ -57,6 +57,7 @@ drm_gem_array_from_handles(struct drm_file *drm_file, u32 *handles, u32 nents)
}
return objs;
}
+EXPORT_SYMBOL(drm_gem_array_from_handles);

/**
* drm_gem_array_put_free -- put gem objects and free array.
@@ -74,3 +75,4 @@ void drm_gem_array_put_free(struct drm_gem_object_array *objs)
}
drm_gem_array_free(objs);
}
+EXPORT_SYMBOL(drm_gem_array_put_free);
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 5cffd2e54c04..21ebf5cdb8bc 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 drm_gem_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 = drm_gem_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)
+ drm_gem_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..6efea4fca012 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)
+ drm_gem_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 drm_gem_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
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