dma-buf: add enum dma_resv_usage v4

This change adds the dma_resv_usage enum and allows us to specify why a
dma_resv object is queried for its containing fences.

Additional to that a dma_resv_usage_rw() helper function is added to aid
retrieving the fences for a read or write userspace submission.

This is then deployed to the different query functions of the dma_resv
object and all of their users. When the write paratermer was previously
true we now use DMA_RESV_USAGE_WRITE and DMA_RESV_USAGE_READ otherwise.

v2: add KERNEL/OTHER in separate patch
v3: some kerneldoc suggestions by Daniel
v4: some more kerneldoc suggestions by Daniel, fix missing cases lost in
    the rebase pointed out by Bas.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20220407085946.744568-2-christian.koenig@amd.com

drivers/gpu/drm/scheduler/sched_main.c

@@ -705,7 +705,8 @@ int drm_sched_job_add_implicit_dependencies(struct drm_sched_job *job,
 
 	dma_resv_assert_held(obj->resv);
 
-	dma_resv_for_each_fence(&cursor, obj->resv, write, fence) {
+	dma_resv_for_each_fence(&cursor, obj->resv, dma_resv_usage_rw(write),
+				fence) {
 		/* Make sure to grab an additional ref on the added fence */
 		dma_fence_get(fence);
 		ret = drm_sched_job_add_dependency(job, fence);