drm/amdgpu: handle ras reset

add another flag to allow IP do a gpu reset after device init.
Signed-off-by: xinhui pan <xinhui.pan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -119,6 +119,7 @@ const char *ras_block_string[] = {
 #define ras_block_str(i) (ras_block_string[i])
 
 #define AMDGPU_RAS_FLAG_INIT_BY_VBIOS		1
+#define AMDGPU_RAS_FLAG_INIT_NEED_RESET		2
 #define RAS_DEFAULT_FLAGS (AMDGPU_RAS_FLAG_INIT_BY_VBIOS)
 
 static void amdgpu_ras_self_test(struct amdgpu_device *adev)
@@ -1358,6 +1359,19 @@ static int amdgpu_ras_recovery_fini(struct amdgpu_device *adev)
 }
 /* recovery end */
 
+/* return 0 if ras will reset gpu and repost.*/
+int amdgpu_ras_request_reset_on_boot(struct amdgpu_device *adev,
+		unsigned int block)
+{
+	struct amdgpu_ras *ras = amdgpu_ras_get_context(adev);
+
+	if (!ras)
+		return -EINVAL;
+
+	ras->flags |= AMDGPU_RAS_FLAG_INIT_NEED_RESET;
+	return 0;
+}
+
 /*
  * check hardware's ras ability which will be saved in hw_supported.
  * if hardware does not support ras, we can skip some ras initializtion and
@@ -1433,7 +1447,12 @@ int amdgpu_ras_init(struct amdgpu_device *adev)
 	return -EINVAL;
 }
 
-/* do some init work after IP late init as dependence */
+/* do some init work after IP late init as dependence.
+ * TODO
+ * gpu reset will re-enable ras, need fint out one way to run it again.
+ * for now, if a gpu reset happened, unless IP enable its ras, the ras state
+ * will be showed as disabled.
+ */
 void amdgpu_ras_post_init(struct amdgpu_device *adev)
 {
 	struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
@@ -1462,6 +1481,19 @@ void amdgpu_ras_post_init(struct amdgpu_device *adev)
 			}
 		}
 	}
+
+	if (con->flags & AMDGPU_RAS_FLAG_INIT_NEED_RESET) {
+		con->flags &= ~AMDGPU_RAS_FLAG_INIT_NEED_RESET;
+		/* setup ras obj state as disabled.
+		 * for init_by_vbios case.
+		 * if we want to enable ras, just enable it in a normal way.
+		 * If we want do disable it, need setup ras obj as enabled,
+		 * then issue another TA disable cmd.
+		 * See feature_enable_on_boot
+		 */
+		amdgpu_ras_disable_all_features(adev, 1);
+		amdgpu_ras_reset_gpu(adev, 0);
+	}
 }
 
 /* do some fini work before IP fini as dependence */

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

@@ -175,6 +175,9 @@ static inline int amdgpu_ras_is_supported(struct amdgpu_device *adev,
 	return ras && (ras->supported & (1 << block));
 }
 
+int amdgpu_ras_request_reset_on_boot(struct amdgpu_device *adev,
+		unsigned int block);
+
 int amdgpu_ras_query_error_count(struct amdgpu_device *adev,
 		bool is_ce);