drm/amdgpu: add reset_ras_error_count function for MMHUB

MMHUB ras error counters are dirty ones after cold reboot
Read operation is needed to reset them to 0
Signed-off-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Guchun Chen <guchun.chen@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_mmhub.h

@@ -26,6 +26,7 @@ struct amdgpu_mmhub_funcs {
 	int (*ras_late_init)(struct amdgpu_device *adev);
 	void (*query_ras_error_count)(struct amdgpu_device *adev,
 					void *ras_error_status);
+	void (*reset_ras_error_count)(struct amdgpu_device *adev);
 };
 
 struct amdgpu_mmhub {

drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c

@@ -948,6 +948,9 @@ static int gmc_v9_0_late_init(void *handle)
 		}
 	}
 
+	if (adev->mmhub.funcs && adev->mmhub.funcs->reset_ras_error_count)
+		adev->mmhub.funcs->reset_ras_error_count(adev);
+
 	r = amdgpu_gmc_ras_late_init(adev);
 	if (r)
 		return r;

drivers/gpu/drm/amd/amdgpu/mmhub_v1_0.c

@@ -747,7 +747,19 @@ static void mmhub_v1_0_query_ras_error_count(struct amdgpu_device *adev,
 	err_data->ue_count += ded_count;
 }
 
+static void mmhub_v1_0_reset_ras_error_count(struct amdgpu_device *adev)
+{
+	uint32_t i;
+
+	/* read back edc counter registers to reset the counters to 0 */
+	if (amdgpu_ras_is_supported(adev, AMDGPU_RAS_BLOCK__MMHUB)) {
+		for (i = 0; i < ARRAY_SIZE(mmhub_v1_0_edc_cnt_regs); i++)
+			RREG32(SOC15_REG_ENTRY_OFFSET(mmhub_v1_0_edc_cnt_regs[i]));
+	}
+}
+
 const struct amdgpu_mmhub_funcs mmhub_v1_0_funcs = {
 	.ras_late_init = amdgpu_mmhub_ras_late_init,
 	.query_ras_error_count = mmhub_v1_0_query_ras_error_count,
+	.reset_ras_error_count = mmhub_v1_0_reset_ras_error_count,
 };

drivers/gpu/drm/amd/amdgpu/mmhub_v9_4.c

@@ -1596,7 +1596,19 @@ static void mmhub_v9_4_query_ras_error_count(struct amdgpu_device *adev,
 	err_data->ue_count += ded_count;
 }
 
+static void mmhub_v9_4_reset_ras_error_count(struct amdgpu_device *adev)
+{
+	uint32_t i;
+
+	/* read back edc counter registers to reset the counters to 0 */
+	if (amdgpu_ras_is_supported(adev, AMDGPU_RAS_BLOCK__MMHUB)) {
+		for (i = 0; i < ARRAY_SIZE(mmhub_v9_4_edc_cnt_regs); i++)
+			RREG32(SOC15_REG_ENTRY_OFFSET(mmhub_v9_4_edc_cnt_regs[i]));
+	}
+}
+
 const struct amdgpu_mmhub_funcs mmhub_v9_4_funcs = {
 	.ras_late_init = amdgpu_mmhub_ras_late_init,
 	.query_ras_error_count = mmhub_v9_4_query_ras_error_count,
+	.reset_ras_error_count = mmhub_v9_4_reset_ras_error_count,
 };