drm/amdgpu: add reset sources in gpu reset context

reset source or reset cause is very useful info
for reset context, it will be used by events API.
Suggested-by: Lijo Lazar <Lijo.Lazar@amd.com>
Signed-off-by: Eric Huang <jinhuieric.huang@amd.com>
Reviewed-by: Lijo Lazar <lijo.lazar@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -160,3 +160,37 @@ void amdgpu_device_unlock_reset_domain(struct amdgpu_reset_domain *reset_domain)
 	atomic_set(&reset_domain->in_gpu_reset, 0);
 	up_write(&reset_domain->sem);
 }
+
+void amdgpu_reset_get_desc(struct amdgpu_reset_context *rst_ctxt, char *buf,
+			   size_t len)
+{
+	struct amdgpu_ring *ring;
+
+	if (!buf || !len)
+		return;
+
+	switch (rst_ctxt->src) {
+	case AMDGPU_RESET_SRC_JOB:
+		if (rst_ctxt->job) {
+			ring = amdgpu_job_ring(rst_ctxt->job);
+			snprintf(buf, len, "job hang on ring:%s", ring->name);
+		} else {
+			strscpy(buf, "job hang", len);
+		}
+		break;
+	case AMDGPU_RESET_SRC_RAS:
+		strscpy(buf, "RAS error", len);
+		break;
+	case AMDGPU_RESET_SRC_MES:
+		strscpy(buf, "MES hang", len);
+		break;
+	case AMDGPU_RESET_SRC_HWS:
+		strscpy(buf, "HWS hang", len);
+		break;
+	case AMDGPU_RESET_SRC_USER:
+		strscpy(buf, "user trigger", len);
+		break;
+	default:
+		strscpy(buf, "unknown", len);
+	}
+}

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

@@ -36,6 +36,15 @@ enum AMDGPU_RESET_FLAGS {
 	AMDGPU_HOST_FLR = 3,
 };
 
+enum AMDGPU_RESET_SRCS {
+	AMDGPU_RESET_SRC_UNKNOWN,
+	AMDGPU_RESET_SRC_JOB,
+	AMDGPU_RESET_SRC_RAS,
+	AMDGPU_RESET_SRC_MES,
+	AMDGPU_RESET_SRC_HWS,
+	AMDGPU_RESET_SRC_USER,
+};
+
 struct amdgpu_reset_context {
 	enum amd_reset_method method;
 	struct amdgpu_device *reset_req_dev;
@@ -43,6 +52,7 @@ struct amdgpu_reset_context {
 	struct amdgpu_hive_info *hive;
 	struct list_head *reset_device_list;
 	unsigned long flags;
+	enum AMDGPU_RESET_SRCS src;
 };
 
 struct amdgpu_reset_handler {
@@ -130,6 +140,9 @@ void amdgpu_device_lock_reset_domain(struct amdgpu_reset_domain *reset_domain);
 
 void amdgpu_device_unlock_reset_domain(struct amdgpu_reset_domain *reset_domain);
 
+void amdgpu_reset_get_desc(struct amdgpu_reset_context *rst_ctxt, char *buf,
+			   size_t len);
+
 #define for_each_handler(i, handler, reset_ctl)                  \
 	for (i = 0; (i < AMDGPU_RESET_MAX_HANDLERS) &&           \
 		    (handler = (*reset_ctl->reset_handlers)[i]); \