From: Felix Kuehling <Felix.Kuehling@amd.com>
Date: Wed, 15 Jun 2016 16:33:15 -0400
Subject: drm/amdgpu: Enable SDMA context switching for CIK
Git-commit: 763dbbfa5f678ceec59b81bc13bc9dc445920e9b
Patch-mainline: v4.14-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
Enable SDMA context switching on CIK (copied from sdma_v3_0.c).
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Chunming Zhou <david1.zhou@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/amd/amdgpu/cik_sdma.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
--- 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 amd
}
/**
+ * 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_
/* 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;