Reviewed-by: Chunming Zhou <david1.zhou at amd.com> -----Original Message----- From: amd-gfx [mailto:amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Felix Kuehling Sent: Tuesday, July 04, 2017 5:11 AM To: amd-gfx at lists.freedesktop.org Cc: Kuehling, Felix <Felix.Kuehling at amd.com> Subject: [PATCH 03/12] drm/amdgpu: Enable SDMA context switching for CIK Enable SDMA context switching on CIK (copied from sdma_v3_0.c). Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com> --- drivers/gpu/drm/amd/amdgpu/cik_sdma.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/gpu/drm/amd/amdgpu/cik_sdma.c b/drivers/gpu/drm/amd/amdgpu/cik_sdma.c index c216e16..4a9cea0 100644 --- a/drivers/gpu/drm/amd/amdgpu/cik_sdma.c +++ b/drivers/gpu/drm/amd/amdgpu/cik_sdma.c @@ -342,6 +342,33 @@ static void cik_sdma_rlc_stop(struct amdgpu_device *adev) } /** + * cik_ctx_switch_enable - stop the async dma engines context switch + * + * @adev: amdgpu_device pointer + * @enable: enable/disable the DMA MEs context switch. + * + * Halt or unhalt the async dma engines context switch (VI). + */ +static void cik_ctx_switch_enable(struct amdgpu_device *adev, bool +enable) { + u32 f32_cntl; + int i; + + for (i = 0; i < adev->sdma.num_instances; i++) { + f32_cntl = RREG32(mmSDMA0_CNTL + sdma_offsets[i]); + if (enable) { + f32_cntl = REG_SET_FIELD(f32_cntl, SDMA0_CNTL, + AUTO_CTXSW_ENABLE, 1); + } else { + f32_cntl = REG_SET_FIELD(f32_cntl, SDMA0_CNTL, + AUTO_CTXSW_ENABLE, 0); + } + + WREG32(mmSDMA0_CNTL + sdma_offsets[i], f32_cntl); + } +} + +/** * cik_sdma_enable - stop the async dma engines * * @adev: amdgpu_device pointer @@ -537,6 +564,8 @@ static int cik_sdma_start(struct amdgpu_device *adev) /* halt the engine before programing */ cik_sdma_enable(adev, false); + /* enable sdma ring preemption */ + cik_ctx_switch_enable(adev, true); /* start the gfx rings and rlc compute queues */ r = cik_sdma_gfx_resume(adev); @@ -984,6 +1013,7 @@ static int cik_sdma_hw_fini(void *handle) { struct amdgpu_device *adev = (struct amdgpu_device *)handle; + cik_ctx_switch_enable(adev, false); cik_sdma_enable(adev, false); return 0; -- 1.9.1 _______________________________________________ amd-gfx mailing list amd-gfx at lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx
