drm/amd/powerplay: Followup fixes to mc_reg_address

This is a followup to:
drm/amd/powerplay: Fix buffer overflows with mc_reg_address

Rework *_set_mc_special_registers for the other architectures to
use the same logic as the first patch. This allows the last entry
of the array to be filled without an error message for example.
This doesn't fix any known problems, perhaps avoided by luck.
Reviewed-by: NAlex Deucher <alexander.deucher@amd.com>
Signed-off-by: NErnst Sjöstrand <ernstp@gmail.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>

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

@@ -5845,9 +5845,9 @@ static int si_set_mc_special_registers(struct amdgpu_device *adev,
 					((temp_reg & 0xffff0000)) |
 					((table->mc_reg_table_entry[k].mc_data[i] & 0xffff0000) >> 16);
 			j++;
+
 			if (j >= SMC_SISLANDS_MC_REGISTER_ARRAY_SIZE)
 				return -EINVAL;
-
 			temp_reg = RREG32(MC_PMG_CMD_MRS);
 			table->mc_reg_address[j].s1 = MC_PMG_CMD_MRS;
 			table->mc_reg_address[j].s0 = MC_SEQ_PMG_CMD_MRS_LP;
@@ -5859,18 +5859,16 @@ static int si_set_mc_special_registers(struct amdgpu_device *adev,
 					table->mc_reg_table_entry[k].mc_data[j] |= 0x100;
 			}
 			j++;
-			if (j >= SMC_SISLANDS_MC_REGISTER_ARRAY_SIZE)
-				return -EINVAL;
 
 			if (adev->mc.vram_type != AMDGPU_VRAM_TYPE_GDDR5) {
+				if (j >= SMC_SISLANDS_MC_REGISTER_ARRAY_SIZE)
+					return -EINVAL;
 				table->mc_reg_address[j].s1 = MC_PMG_AUTO_CMD;
 				table->mc_reg_address[j].s0 = MC_PMG_AUTO_CMD;
 				for (k = 0; k < table->num_entries; k++)
 					table->mc_reg_table_entry[k].mc_data[j] =
 						(table->mc_reg_table_entry[k].mc_data[i] & 0xffff0000) >> 16;
 				j++;
-				if (j >= SMC_SISLANDS_MC_REGISTER_ARRAY_SIZE)
-					return -EINVAL;
 			}
 			break;
 		case MC_SEQ_RESERVE_M:
@@ -5882,8 +5880,6 @@ static int si_set_mc_special_registers(struct amdgpu_device *adev,
 					(temp_reg & 0xffff0000) |
 					(table->mc_reg_table_entry[k].mc_data[i] & 0x0000ffff);
 			j++;
-			if (j >= SMC_SISLANDS_MC_REGISTER_ARRAY_SIZE)
-				return -EINVAL;
 			break;
 		default:
 			break;

drivers/gpu/drm/amd/powerplay/smumgr/ci_smumgr.c

@@ -2600,9 +2600,9 @@ static int ci_set_mc_special_registers(struct pp_hwmgr *hwmgr,
 					((table->mc_reg_table_entry[k].mc_data[i] & 0xffff0000) >> 16);
 			}
 			j++;
+
 			PP_ASSERT_WITH_CODE((j < SMU7_DISCRETE_MC_REGISTER_ARRAY_SIZE),
 				"Invalid VramInfo table.", return -EINVAL);
-
 			temp_reg = cgs_read_register(hwmgr->device, mmMC_PMG_CMD_MRS);
 			table->mc_reg_address[j].s1 = mmMC_PMG_CMD_MRS;
 			table->mc_reg_address[j].s0 = mmMC_SEQ_PMG_CMD_MRS_LP;
@@ -2615,10 +2615,10 @@ static int ci_set_mc_special_registers(struct pp_hwmgr *hwmgr,
 					table->mc_reg_table_entry[k].mc_data[j] |= 0x100;
 			}
 			j++;
-			PP_ASSERT_WITH_CODE((j <= SMU7_DISCRETE_MC_REGISTER_ARRAY_SIZE),
-				"Invalid VramInfo table.", return -EINVAL);
 
-			if (!data->is_memory_gddr5 && j < SMU7_DISCRETE_MC_REGISTER_ARRAY_SIZE) {
+			if (!data->is_memory_gddr5) {
+				PP_ASSERT_WITH_CODE((j < SMU7_DISCRETE_MC_REGISTER_ARRAY_SIZE),
+					"Invalid VramInfo table.", return -EINVAL);
 				table->mc_reg_address[j].s1 = mmMC_PMG_AUTO_CMD;
 				table->mc_reg_address[j].s0 = mmMC_PMG_AUTO_CMD;
 				for (k = 0; k < table->num_entries; k++) {
@@ -2626,8 +2626,6 @@ static int ci_set_mc_special_registers(struct pp_hwmgr *hwmgr,
 						(table->mc_reg_table_entry[k].mc_data[i] & 0xffff0000) >> 16;
 				}
 				j++;
-				PP_ASSERT_WITH_CODE((j <= SMU7_DISCRETE_MC_REGISTER_ARRAY_SIZE),
-					"Invalid VramInfo table.", return -EINVAL);
 			}
 
 			break;
@@ -2642,8 +2640,6 @@ static int ci_set_mc_special_registers(struct pp_hwmgr *hwmgr,
 					(table->mc_reg_table_entry[k].mc_data[i] & 0x0000ffff);
 			}
 			j++;
-			PP_ASSERT_WITH_CODE((j <= SMU7_DISCRETE_MC_REGISTER_ARRAY_SIZE),
-				"Invalid VramInfo table.", return -EINVAL);
 			break;
 
 		default:

drivers/gpu/drm/amd/powerplay/smumgr/iceland_smumgr.c

@@ -2549,9 +2549,9 @@ static int iceland_set_mc_special_registers(struct pp_hwmgr *hwmgr,
 					((table->mc_reg_table_entry[k].mc_data[i] & 0xffff0000) >> 16);
 			}
 			j++;
+
 			PP_ASSERT_WITH_CODE((j < SMU71_DISCRETE_MC_REGISTER_ARRAY_SIZE),
 				"Invalid VramInfo table.", return -EINVAL);
-
 			temp_reg = cgs_read_register(hwmgr->device, mmMC_PMG_CMD_MRS);
 			table->mc_reg_address[j].s1 = mmMC_PMG_CMD_MRS;
 			table->mc_reg_address[j].s0 = mmMC_SEQ_PMG_CMD_MRS_LP;
@@ -2565,10 +2565,10 @@ static int iceland_set_mc_special_registers(struct pp_hwmgr *hwmgr,
 				}
 			}
 			j++;
-			PP_ASSERT_WITH_CODE((j <= SMU71_DISCRETE_MC_REGISTER_ARRAY_SIZE),
-				"Invalid VramInfo table.", return -EINVAL);
 
-			if (!data->is_memory_gddr5 && j < SMU71_DISCRETE_MC_REGISTER_ARRAY_SIZE) {
+			if (!data->is_memory_gddr5) {
+				PP_ASSERT_WITH_CODE((j < SMU71_DISCRETE_MC_REGISTER_ARRAY_SIZE),
+					"Invalid VramInfo table.", return -EINVAL);
 				table->mc_reg_address[j].s1 = mmMC_PMG_AUTO_CMD;
 				table->mc_reg_address[j].s0 = mmMC_PMG_AUTO_CMD;
 				for (k = 0; k < table->num_entries; k++) {
@@ -2576,8 +2576,6 @@ static int iceland_set_mc_special_registers(struct pp_hwmgr *hwmgr,
 						(table->mc_reg_table_entry[k].mc_data[i] & 0xffff0000) >> 16;
 				}
 				j++;
-				PP_ASSERT_WITH_CODE((j <= SMU71_DISCRETE_MC_REGISTER_ARRAY_SIZE),
-					"Invalid VramInfo table.", return -EINVAL);
 			}
 
 			break;
@@ -2592,8 +2590,6 @@ static int iceland_set_mc_special_registers(struct pp_hwmgr *hwmgr,
 					(table->mc_reg_table_entry[k].mc_data[i] & 0x0000ffff);
 			}
 			j++;
-			PP_ASSERT_WITH_CODE((j <= SMU71_DISCRETE_MC_REGISTER_ARRAY_SIZE),
-				"Invalid VramInfo table.", return -EINVAL);
 			break;
 
 		default: