1 /* SPDX-License-Identifier: MIT */ 2 /* 3 * Copyright © 2026 Intel Corporation 4 */ 5 6 #ifndef __DRM_RAS_H__ 7 #define __DRM_RAS_H__ 8 9 #include <linux/types.h> 10 11 #include <uapi/drm/drm_ras.h> 12 13 /** 14 * struct drm_ras_node - A DRM RAS Node 15 */ 16 struct drm_ras_node { 17 /** @id: Unique identifier for the node. Dynamically assigned. */ 18 u32 id; 19 /** 20 * @device_name: Human-readable name of the device. Given by the driver. 21 */ 22 const char *device_name; 23 /** @node_name: Human-readable name of the node. Given by the driver. */ 24 const char *node_name; 25 /** @type: Type of the node (enum drm_ras_node_type). */ 26 enum drm_ras_node_type type; 27 28 /* Error-Counter Related Callback and Variables */ 29 30 /** @error_counter_range: Range of valid Error IDs for this node. */ 31 struct { 32 /** @first: First valid Error ID. */ 33 u32 first; 34 /** @last: Last valid Error ID. Mandatory entry. */ 35 u32 last; 36 } error_counter_range; 37 38 /** 39 * @query_error_counter: 40 * 41 * This callback is used by drm-ras to query a specific error counter. 42 * Used for input check and to iterate all error counters in a node. 43 * 44 * Driver should expect query_error_counter() to be called with 45 * error_id from `error_counter_range.first` to 46 * `error_counter_range.last`. 47 * 48 * The @query_error_counter is a mandatory callback for 49 * error_counter_node. 50 * 51 * Returns: 0 on success, 52 * -ENOENT when error_id is not supported as an indication that 53 * drm_ras should silently skip this entry. Used for 54 * supporting non-contiguous error ranges. 55 * Driver is responsible for maintaining the list of 56 * supported error IDs in the range of first to last. 57 * Other negative values on errors that should terminate the 58 * netlink query. 59 */ 60 int (*query_error_counter)(struct drm_ras_node *node, u32 error_id, 61 const char **name, u32 *val); 62 63 /** 64 * @clear_error_counter: 65 * 66 * This callback is used by drm_ras to clear a specific error counter. 67 * Driver should implement this callback to support clearing error counters 68 * of a node. 69 * 70 * Returns: 0 on success, negative error code on failure. 71 */ 72 int (*clear_error_counter)(struct drm_ras_node *node, u32 error_id); 73 74 /** @priv: Driver private data */ 75 void *priv; 76 }; 77 78 struct drm_device; 79 80 #if IS_ENABLED(CONFIG_DRM_RAS) 81 int drm_ras_node_register(struct drm_ras_node *node); 82 void drm_ras_node_unregister(struct drm_ras_node *node); 83 #else 84 static inline int drm_ras_node_register(struct drm_ras_node *node) { return 0; } 85 static inline void drm_ras_node_unregister(struct drm_ras_node *node) { } 86 #endif 87 88 #endif 89