drm/amdgpu: implement querying ras error count for mmhub

get mmhub ea ras error count by accessing EDC_CNT register
Signed-off-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/mmhub_v1_0.c

@@ -21,11 +21,13 @@
  *
  */
 #include "amdgpu.h"
+#include "amdgpu_ras.h"
 #include "mmhub_v1_0.h"
 
 #include "mmhub/mmhub_1_0_offset.h"
 #include "mmhub/mmhub_1_0_sh_mask.h"
 #include "mmhub/mmhub_1_0_default.h"
+#include "mmhub/mmhub_9_4_0_offset.h"
 #include "vega10_enum.h"
 
 #include "soc15_common.h"
@@ -33,6 +35,9 @@
 #define mmDAGB0_CNTL_MISC2_RV 0x008f
 #define mmDAGB0_CNTL_MISC2_RV_BASE_IDX 0
 
+#define EA_EDC_CNT_MASK 0x3
+#define EA_EDC_CNT_SHIFT 0x2
+
 u64 mmhub_v1_0_get_fb_location(struct amdgpu_device *adev)
 {
 	u64 base = RREG32_SOC15(MMHUB, 0, mmMC_VM_FB_LOCATION_BASE);
@@ -557,6 +562,56 @@ void mmhub_v1_0_get_clockgating(struct amdgpu_device *adev, u32 *flags)
 static void mmhub_v1_0_query_ras_error_count(struct amdgpu_device *adev,
 					   void *ras_error_status)
 {
+	int i;
+	uint32_t ea0_edc_cnt, ea0_edc_cnt2;
+	uint32_t ea1_edc_cnt, ea1_edc_cnt2;
+	struct ras_err_data *err_data = (struct ras_err_data *)ras_error_status;
+
+	/* EDC CNT will be cleared automatically after read */
+	ea0_edc_cnt = RREG32_SOC15(MMHUB, 0, mmMMEA0_EDC_CNT_VG20);
+	ea0_edc_cnt2 = RREG32_SOC15(MMHUB, 0, mmMMEA0_EDC_CNT2_VG20);
+	ea1_edc_cnt = RREG32_SOC15(MMHUB, 0, mmMMEA1_EDC_CNT_VG20);
+	ea1_edc_cnt2 = RREG32_SOC15(MMHUB, 0, mmMMEA1_EDC_CNT2_VG20);
+
+	/* error count of each error type is recorded by 2 bits,
+	 * ce and ue count in EDC_CNT
+	 */
+	for (i = 0; i < 5; i++) {
+		err_data->ce_count += (ea0_edc_cnt & EA_EDC_CNT_MASK);
+		err_data->ce_count += (ea1_edc_cnt & EA_EDC_CNT_MASK);
+		ea0_edc_cnt >>= EA_EDC_CNT_SHIFT;
+		ea1_edc_cnt >>= EA_EDC_CNT_SHIFT;
+		err_data->ue_count += (ea0_edc_cnt & EA_EDC_CNT_MASK);
+		err_data->ue_count += (ea1_edc_cnt & EA_EDC_CNT_MASK);
+		ea0_edc_cnt >>= EA_EDC_CNT_SHIFT;
+		ea1_edc_cnt >>= EA_EDC_CNT_SHIFT;
+	}
+	/* successive ue count in EDC_CNT */
+	for (i = 0; i < 5; i++) {
+		err_data->ue_count += (ea0_edc_cnt & EA_EDC_CNT_MASK);
+		err_data->ue_count += (ea1_edc_cnt & EA_EDC_CNT_MASK);
+		ea0_edc_cnt >>= EA_EDC_CNT_SHIFT;
+		ea1_edc_cnt >>= EA_EDC_CNT_SHIFT;
+	}
+
+	/* ce and ue count in EDC_CNT2 */
+	for (i = 0; i < 3; i++) {
+		err_data->ce_count += (ea0_edc_cnt2 & EA_EDC_CNT_MASK);
+		err_data->ce_count += (ea1_edc_cnt2 & EA_EDC_CNT_MASK);
+		ea0_edc_cnt2 >>= EA_EDC_CNT_SHIFT;
+		ea1_edc_cnt2 >>= EA_EDC_CNT_SHIFT;
+		err_data->ue_count += (ea0_edc_cnt2 & EA_EDC_CNT_MASK);
+		err_data->ue_count += (ea1_edc_cnt2 & EA_EDC_CNT_MASK);
+		ea0_edc_cnt2 >>= EA_EDC_CNT_SHIFT;
+		ea1_edc_cnt2 >>= EA_EDC_CNT_SHIFT;
+	}
+	/* successive ue count in EDC_CNT2 */
+	for (i = 0; i < 6; i++) {
+		err_data->ue_count += (ea0_edc_cnt2 & EA_EDC_CNT_MASK);
+		err_data->ue_count += (ea1_edc_cnt2 & EA_EDC_CNT_MASK);
+		ea0_edc_cnt2 >>= EA_EDC_CNT_SHIFT;
+		ea1_edc_cnt2 >>= EA_EDC_CNT_SHIFT;
+	}
 }
 
 const struct amdgpu_mmhub_funcs mmhub_v1_0_funcs = {

drivers/gpu/drm/amd/include/asic_reg/mmhub/mmhub_9_4_0_offset.h

@@ -21,6 +21,27 @@
 #ifndef _mmhub_9_4_0_OFFSET_HEADER
 #define _mmhub_9_4_0_OFFSET_HEADER
 
+/* MMEA */
+#define mmMMEA0_SDP_ARB_FINAL_VG20                                                                     0x01ee
+#define mmMMEA0_SDP_ARB_FINAL_VG20_BASE_IDX                                                            0
+#define mmMMEA0_EDC_CNT_VG20                                                                           0x0206
+#define mmMMEA0_EDC_CNT_VG20_BASE_IDX                                                                  0
+#define mmMMEA0_EDC_CNT2_VG20                                                                          0x0207
+#define mmMMEA0_EDC_CNT2_VG20_BASE_IDX                                                                 0
+#define mmMMEA0_EDC_MODE_VG20                                                                          0x0210
+#define mmMMEA0_EDC_MODE_VG20_BASE_IDX                                                                 0
+#define mmMMEA0_ERR_STATUS_VG20                                                                        0x0211
+#define mmMMEA0_ERR_STATUS_VG20_BASE_IDX                                                               0
+#define mmMMEA1_SDP_ARB_FINAL_VG20                                                                     0x032e
+#define mmMMEA1_SDP_ARB_FINAL_VG20_BASE_IDX                                                            0
+#define mmMMEA1_EDC_CNT_VG20                                                                           0x0346
+#define mmMMEA1_EDC_CNT_VG20_BASE_IDX                                                                  0
+#define mmMMEA1_EDC_CNT2_VG20                                                                          0x0347
+#define mmMMEA1_EDC_CNT2_VG20_BASE_IDX                                                                 0
+#define mmMMEA1_EDC_MODE_VG20                                                                          0x0350
+#define mmMMEA1_EDC_MODE_VG20_BASE_IDX                                                                 0
+#define mmMMEA1_ERR_STATUS_VG20                                                                        0x0351
+#define mmMMEA1_ERR_STATUS_VG20_BASE_IDX                                                               0
 
 // addressBlock: mmhub_utcl2_vmsharedpfdec
 // base address: 0x6a040