[PATCH] drm/amdgpu: bypass lru touch for KIQ ring submission

[Liu, Monk]

RB-by: Monk Liu

-----Original Message-----
From: amd-gfx [mailto:amd-gfx-bounces at lists.freedesktop.org] On Behalf Of Pixel Ding
Sent: 2017年11月8日 10:30
To: ckoenig.leichtzumerken at gmail.com; amd-gfx at lists.freedesktop.org
Cc: Ding, Pixel <Pixel.Ding at amd.com>
Subject: [PATCH] drm/amdgpu: bypass lru touch for KIQ ring submission

KIQ ring submission is used for register accessing on SRIOV VF that could happen both in irq enabled and irq disabled cases.
Inversion lock could happen on adev->ring_lru_list_lock, while this operation is useless and just adds overhead in this use case.

Signed-off-by: Pixel Ding <Pixel.Ding at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
index e5ece1f..a98fbbb 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
@@ -136,7 +136,8 @@ void amdgpu_ring_commit(struct amdgpu_ring *ring)
 	if (ring->funcs->end_use)
 		ring->funcs->end_use(ring);
 
-	amdgpu_ring_lru_touch(ring->adev, ring);
+	if (ring->funcs->type != AMDGPU_RING_TYPE_KIQ)
+		amdgpu_ring_lru_touch(ring->adev, ring);
 }
 
 /**
--
2.9.5

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