This is a note to let you know that I've just added the patch titled
drm/amdgpu: bypass lru touch for KIQ ring submission
to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...
The filename of the patch is: drm-amdgpu-bypass-lru-touch-for-kiq-ring-submission.patch and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From foo@baz Mon Dec 18 13:28:59 CET 2017
From: Pixel Ding Pixel.Ding@amd.com Date: Wed, 8 Nov 2017 10:20:01 +0800 Subject: drm/amdgpu: bypass lru touch for KIQ ring submission
From: Pixel Ding Pixel.Ding@amd.com
[ Upstream commit dce1e131dd4dc68099ff1b70aa03cd2d0acf8639 ]
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@amd.com Reviewed-by: Monk Liu Monk.Liu@amd.com Reviewed-by: Christian König christian.koenig@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- 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_ri 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); }
/**
Patches currently in stable-queue which might be from Pixel.Ding@amd.com are
queue-4.14/drm-amdgpu-bypass-lru-touch-for-kiq-ring-submission.patch