drm/amdgpu: invalidate L2 before SDMA IBs (v2)

[ Upstream commit fdf83646c0542ecfb9adc4db8f741a1f43dca058 ]

This fixes GPU hangs due to cache coherency issues.

v2: Split the version bump to a separate patch

Signed-off-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Tested-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/amdgpu/navi10_sdma_pkt_open.h b/drivers/gpu/drm/amd/amdgpu/navi10_sdma_pkt_open.h
index 074a9a0..a5b60c9 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/navi10_sdma_pkt_open.h
+++ b/drivers/gpu/drm/amd/amdgpu/navi10_sdma_pkt_open.h
@@ -73,6 +73,22 @@
 #define SDMA_OP_AQL_COPY  0
 #define SDMA_OP_AQL_BARRIER_OR  0
 
+#define SDMA_GCR_RANGE_IS_PA           (1 << 18)
+#define SDMA_GCR_SEQ(x)                        (((x) & 0x3) << 16)
+#define SDMA_GCR_GL2_WB                        (1 << 15)
+#define SDMA_GCR_GL2_INV               (1 << 14)
+#define SDMA_GCR_GL2_DISCARD           (1 << 13)
+#define SDMA_GCR_GL2_RANGE(x)          (((x) & 0x3) << 11)
+#define SDMA_GCR_GL2_US                        (1 << 10)
+#define SDMA_GCR_GL1_INV               (1 << 9)
+#define SDMA_GCR_GLV_INV               (1 << 8)
+#define SDMA_GCR_GLK_INV               (1 << 7)
+#define SDMA_GCR_GLK_WB                        (1 << 6)
+#define SDMA_GCR_GLM_INV               (1 << 5)
+#define SDMA_GCR_GLM_WB                        (1 << 4)
+#define SDMA_GCR_GL1_RANGE(x)          (((x) & 0x3) << 2)
+#define SDMA_GCR_GLI_INV(x)            (((x) & 0x3) << 0)
+
 /*define for op field*/
 #define SDMA_PKT_HEADER_op_offset 0
 #define SDMA_PKT_HEADER_op_mask   0x000000FF

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
index 2a792d7..bd71501 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v5_0.c
@@ -382,6 +382,18 @@ static void sdma_v5_0_ring_emit_ib(struct amdgpu_ring *ring,
        unsigned vmid = AMDGPU_JOB_GET_VMID(job);
        uint64_t csa_mc_addr = amdgpu_sdma_get_csa_mc_addr(ring, vmid);
 
+       /* Invalidate L2, because if we don't do it, we might get stale cache
+        * lines from previous IBs.
+        */
+       amdgpu_ring_write(ring, SDMA_PKT_HEADER_OP(SDMA_OP_GCR_REQ));
+       amdgpu_ring_write(ring, 0);
+       amdgpu_ring_write(ring, (SDMA_GCR_GL2_INV |
+                                SDMA_GCR_GL2_WB |
+                                SDMA_GCR_GLM_INV |
+                                SDMA_GCR_GLM_WB) << 16);
+       amdgpu_ring_write(ring, 0xffffff80);
+       amdgpu_ring_write(ring, 0xffff);
+
        /* An IB packet must end on a 8 DW boundary--the next dword
         * must be on a 8-dword boundary. Our IB packet below is 6
         * dwords long, thus add x number of NOPs, such that, in
@@ -1607,7 +1619,7 @@ static const struct amdgpu_ring_funcs sdma_v5_0_ring_funcs = {
                SOC15_FLUSH_GPU_TLB_NUM_WREG * 3 +
                SOC15_FLUSH_GPU_TLB_NUM_REG_WAIT * 6 * 2 +
                10 + 10 + 10, /* sdma_v5_0_ring_emit_fence x3 for user fence, vm fence */
-       .emit_ib_size = 7 + 6, /* sdma_v5_0_ring_emit_ib */
+       .emit_ib_size = 5 + 7 + 6, /* sdma_v5_0_ring_emit_ib */
        .emit_ib = sdma_v5_0_ring_emit_ib,
        .emit_fence = sdma_v5_0_ring_emit_fence,
        .emit_pipeline_sync = sdma_v5_0_ring_emit_pipeline_sync,