linux-kernel - [PATCH 08/11] drm/amdgpu: prefer VMIDs idle on the current ring

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Date:	Wed,  1 Jun 2016 15:10:09 +0200
From:	Christian König <deathsimple@...afone.de>
To:	dri-devel@...ts.freedesktop.org
Cc:	linux-kernel@...r.kernel.org, daniel@...ll.ch,
	chris@...is-wilson.co.uk, gustavo@...ovan.org
Subject: [PATCH 08/11] drm/amdgpu: prefer VMIDs idle on the current ring

From: Christian König <christian.koenig@....com>

Prefer to use a VMIDs which are idle on the ring we want to submit to. This
also removes bubbling idle VMIDs up on the LRU, which is actually not
beneficial.

Signed-off-by: Christian König <christian.koenig@....com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 24 +++++++++---------------
 1 file changed, 9 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 2bcb623..b6484a2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -236,21 +236,15 @@ int amdgpu_vm_grab_id(struct amdgpu_vm *vm, struct amdgpu_ring *ring,
 
 	} while (i != ring->idx);
 
-	id = list_first_entry(&adev->vm_manager.ids_lru,
-			      struct amdgpu_vm_id,
-			      list);
-
-	if (!amdgpu_sync_is_idle(&id->active, NULL)) {
-		struct list_head *head = &adev->vm_manager.ids_lru;
-		struct amdgpu_vm_id *tmp;
-
-		list_for_each_entry_safe(id, tmp, &adev->vm_manager.ids_lru,
-					 list) {
-			if (amdgpu_sync_is_idle(&id->active, NULL)) {
-				list_move(&id->list, head);
-				head = &id->list;
-			}
-		}
+	/* Check if we have an idle VMID */
+	list_for_each_entry(id, &adev->vm_manager.ids_lru, list) {
+		if (amdgpu_sync_is_idle(&id->active, ring))
+			break;
+
+	}
+
+	/* If we can't find a idle VMID to use, just wait for the oldest */
+	if (&id->list == &adev->vm_manager.ids_lru) {
 		id = list_first_entry(&adev->vm_manager.ids_lru,
 				      struct amdgpu_vm_id,
 				      list);
-- 
2.5.0