drm/amdgpu: Add graphics cache rinse packet for sdma

Add emit mem sync callback for sdma_v5_2

In amdgpu sync object test, three threads created jobs
to send GFX IB and SDMA IB in sequence. After the first
GFX thread joined, sometimes the third thread will reuse
the same physical page to store the SDMA IB. There will
be a risk that SDMA will read GFX IB in the previous physical
page. So it's better to flush the cache before commit sdma IB.

Signed-off-by: Jinzhou Su <Jinzhou.Su@amd.com>
Reviewed-by: Huang Rui <ray.huang@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c b/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c
index 93f826a..b1ad9e5 100644 (file)
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v5_2.c
@@ -370,6 +370,33 @@ static void sdma_v5_2_ring_emit_ib(struct amdgpu_ring *ring,
 }
 
 /**
+ * sdma_v5_2_ring_emit_mem_sync - flush the IB by graphics cache rinse
+ *
+ * @ring: amdgpu ring pointer
+ * @job: job to retrieve vmid from
+ * @ib: IB object to schedule
+ *
+ * flush the IB by graphics cache rinse.
+ */
+static void sdma_v5_2_ring_emit_mem_sync(struct amdgpu_ring *ring)
+{
+    uint32_t gcr_cntl =
+                   SDMA_GCR_GL2_INV | SDMA_GCR_GL2_WB | SDMA_GCR_GLM_INV |
+                       SDMA_GCR_GL1_INV | SDMA_GCR_GLV_INV | SDMA_GCR_GLK_INV |
+                       SDMA_GCR_GLI_INV(1);
+
+       /* flush entire cache L0/L1/L2, this can be optimized by performance requirement */
+       amdgpu_ring_write(ring, SDMA_PKT_HEADER_OP(SDMA_OP_GCR_REQ));
+       amdgpu_ring_write(ring, SDMA_PKT_GCR_REQ_PAYLOAD1_BASE_VA_31_7(0));
+       amdgpu_ring_write(ring, SDMA_PKT_GCR_REQ_PAYLOAD2_GCR_CONTROL_15_0(gcr_cntl) |
+                       SDMA_PKT_GCR_REQ_PAYLOAD2_BASE_VA_47_32(0));
+       amdgpu_ring_write(ring, SDMA_PKT_GCR_REQ_PAYLOAD3_LIMIT_VA_31_7(0) |
+                       SDMA_PKT_GCR_REQ_PAYLOAD3_GCR_CONTROL_18_16(gcr_cntl >> 16));
+       amdgpu_ring_write(ring, SDMA_PKT_GCR_REQ_PAYLOAD4_LIMIT_VA_47_32(0) |
+                       SDMA_PKT_GCR_REQ_PAYLOAD4_VMID(0));
+}
+
+/**
  * sdma_v5_2_ring_emit_hdp_flush - emit an hdp flush on the DMA ring
  *
  * @ring: amdgpu ring pointer
@@ -1663,6 +1690,7 @@ static const struct amdgpu_ring_funcs sdma_v5_2_ring_funcs = {
                10 + 10 + 10, /* sdma_v5_2_ring_emit_fence x3 for user fence, vm fence */
        .emit_ib_size = 7 + 6, /* sdma_v5_2_ring_emit_ib */
        .emit_ib = sdma_v5_2_ring_emit_ib,
+       .emit_mem_sync = sdma_v5_2_ring_emit_mem_sync,
        .emit_fence = sdma_v5_2_ring_emit_fence,
        .emit_pipeline_sync = sdma_v5_2_ring_emit_pipeline_sync,
        .emit_vm_flush = sdma_v5_2_ring_emit_vm_flush,