drm/amdgpu: add aca sysfs support

add aca sysfs node support
Signed-off-by: Yang Wang <kevinyang.wang@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -572,15 +572,45 @@ static int add_aca_handle(struct amdgpu_device *adev, struct aca_handle_manager
 	return 0;
 }
 
+static ssize_t aca_sysfs_read(struct device *dev,
+			      struct device_attribute *attr, char *buf)
+{
+	struct aca_handle *handle = container_of(attr, struct aca_handle, aca_attr);
+
+	/* NOTE: the aca cache will be auto cleared once read,
+	 * So the driver should unify the query entry point, forward request to ras query interface directly */
+	return amdgpu_ras_aca_sysfs_read(dev, attr, handle, buf, handle->data);
+}
+
+static int add_aca_sysfs(struct amdgpu_device *adev, struct aca_handle *handle)
+{
+	struct device_attribute *aca_attr = &handle->aca_attr;
+
+	snprintf(handle->attr_name, sizeof(handle->attr_name) - 1, "aca_%s", handle->name);
+	aca_attr->show = aca_sysfs_read;
+	aca_attr->attr.name = handle->attr_name;
+	aca_attr->attr.mode = S_IRUGO;
+	sysfs_attr_init(&aca_attr->attr);
+
+	return sysfs_add_file_to_group(&adev->dev->kobj,
+				       &aca_attr->attr,
+				       "ras");
+}
+
 int amdgpu_aca_add_handle(struct amdgpu_device *adev, struct aca_handle *handle,
 			  const char *name, const struct aca_info *ras_info, void *data)
 {
 	struct amdgpu_aca *aca = &adev->aca;
+	int ret;
 
 	if (!amdgpu_aca_is_enabled(adev))
 		return 0;
 
-	return add_aca_handle(adev, &aca->mgr, handle, name, ras_info, data);
+	ret = add_aca_handle(adev, &aca->mgr, handle, name, ras_info, data);
+	if (ret)
+		return ret;
+
+	return add_aca_sysfs(adev, handle);
 }
 
 static void remove_aca(struct aca_handle *handle)

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

@@ -149,6 +149,8 @@ struct aca_handle {
 	struct aca_handle_manager *mgr;
 	struct aca_error_cache error_cache;
 	const struct aca_bank_ops *bank_ops;
+	struct device_attribute aca_attr;
+	char attr_name[64];
 	const char *name;
 	u32 mask;
 	void *data;

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

@@ -1214,6 +1214,21 @@ static int amdgpu_aca_log_ras_error_data(struct amdgpu_device *adev, enum amdgpu
 	return amdgpu_aca_get_error_data(adev, &obj->aca_handle, type, err_data);
 }
 
+ssize_t amdgpu_ras_aca_sysfs_read(struct device *dev, struct device_attribute *attr,
+				  struct aca_handle *handle, char *buf, void *data)
+{
+	struct ras_manager *obj = container_of(handle, struct ras_manager, aca_handle);
+	struct ras_query_if info = {
+		.head = obj->head,
+	};
+
+	if (amdgpu_ras_query_error_status(obj->adev, &info))
+		return -EINVAL;
+
+	return sysfs_emit(buf, "%s: %lu\n%s: %lu\n", "ue", info.ue_count,
+			  "ce", info.ce_count);
+}
+
 static int amdgpu_ras_query_error_status_helper(struct amdgpu_device *adev,
 						struct ras_query_if *info,
 						struct ras_err_data *err_data,

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

@@ -840,4 +840,7 @@ int amdgpu_ras_bind_aca(struct amdgpu_device *adev, enum amdgpu_ras_block blk,
 			       const struct aca_info *aca_info, void *data);
 int amdgpu_ras_unbind_aca(struct amdgpu_device *adev, enum amdgpu_ras_block blk);
 
+ssize_t amdgpu_ras_aca_sysfs_read(struct device *dev, struct device_attribute *attr,
+				  struct aca_handle *handle, char *buf, void *data);
+
 #endif