1 /* 2 * Defines, structures, APIs for edac_device 3 * 4 * (C) 2007 Linux Networx (http://lnxi.com) 5 * This file may be distributed under the terms of the 6 * GNU General Public License. 7 * 8 * Written by Thayne Harbaugh 9 * Based on work by Dan Hollis <goemon at anime dot net> and others. 10 * http://www.anime.net/~goemon/linux-ecc/ 11 * 12 * NMI handling support added by 13 * Dave Peterson <dsp@llnl.gov> <dave_peterson@pobox.com> 14 * 15 * Refactored for multi-source files: 16 * Doug Thompson <norsk5@xmission.com> 17 * 18 * Please look at Documentation/driver-api/edac.rst for more info about 19 * EDAC core structs and functions. 20 */ 21 22 #ifndef _EDAC_DEVICE_H_ 23 #define _EDAC_DEVICE_H_ 24 25 #include <linux/completion.h> 26 #include <linux/device.h> 27 #include <linux/edac.h> 28 #include <linux/kobject.h> 29 #include <linux/list.h> 30 #include <linux/types.h> 31 #include <linux/sysfs.h> 32 #include <linux/workqueue.h> 33 34 35 /* 36 * The following are the structures to provide for a generic 37 * or abstract 'edac_device'. This set of structures and the 38 * code that implements the APIs for the same, provide for 39 * registering EDAC type devices which are NOT standard memory. 40 * 41 * CPU caches (L1 and L2) 42 * DMA engines 43 * Core CPU switches 44 * Fabric switch units 45 * PCIe interface controllers 46 * other EDAC/ECC type devices that can be monitored for 47 * errors, etc. 48 * 49 * It allows for a 2 level set of hierarchy. For example: 50 * 51 * cache could be composed of L1, L2 and L3 levels of cache. 52 * Each CPU core would have its own L1 cache, while sharing 53 * L2 and maybe L3 caches. 54 * 55 * View them arranged, via the sysfs presentation: 56 * /sys/devices/system/edac/.. 57 * 58 * mc/ <existing memory device directory> 59 * cpu/cpu0/.. <L1 and L2 block directory> 60 * /L1-cache/ce_count 61 * /ue_count 62 * /L2-cache/ce_count 63 * /ue_count 64 * cpu/cpu1/.. <L1 and L2 block directory> 65 * /L1-cache/ce_count 66 * /ue_count 67 * /L2-cache/ce_count 68 * /ue_count 69 * ... 70 * 71 * the L1 and L2 directories would be "edac_device_block's" 72 */ 73 74 struct edac_device_counter { 75 u32 ue_count; 76 u32 ce_count; 77 }; 78 79 /* forward reference */ 80 struct edac_device_ctl_info; 81 struct edac_device_block; 82 83 /* edac_dev_sysfs_attribute structure 84 * used for driver sysfs attributes in mem_ctl_info 85 * for extra controls and attributes: 86 * like high level error Injection controls 87 */ 88 struct edac_dev_sysfs_attribute { 89 struct attribute attr; 90 ssize_t (*show)(struct edac_device_ctl_info *, char *); 91 ssize_t (*store)(struct edac_device_ctl_info *, const char *, size_t); 92 }; 93 94 /* edac_dev_sysfs_block_attribute structure 95 * 96 * used in leaf 'block' nodes for adding controls/attributes 97 * 98 * each block in each instance of the containing control structure 99 * can have an array of the following. The show and store functions 100 * will be filled in with the show/store function in the 101 * low level driver. 102 * 103 * The 'value' field will be the actual value field used for 104 * counting 105 */ 106 struct edac_dev_sysfs_block_attribute { 107 struct attribute attr; 108 ssize_t (*show)(struct kobject *, struct attribute *, char *); 109 ssize_t (*store)(struct kobject *, struct attribute *, 110 const char *, size_t); 111 struct edac_device_block *block; 112 113 unsigned int value; 114 }; 115 116 /* device block control structure */ 117 struct edac_device_block { 118 struct edac_device_instance *instance; /* Up Pointer */ 119 char name[EDAC_DEVICE_NAME_LEN + 1]; 120 121 struct edac_device_counter counters; /* basic UE and CE counters */ 122 123 int nr_attribs; /* how many attributes */ 124 125 /* this block's attributes, could be NULL */ 126 struct edac_dev_sysfs_block_attribute *block_attributes; 127 128 /* edac sysfs device control */ 129 struct kobject kobj; 130 }; 131 132 /* device instance control structure */ 133 struct edac_device_instance { 134 struct edac_device_ctl_info *ctl; /* Up pointer */ 135 char name[EDAC_DEVICE_NAME_LEN + 4]; 136 137 struct edac_device_counter counters; /* instance counters */ 138 139 u32 nr_blocks; /* how many blocks */ 140 struct edac_device_block *blocks; /* block array */ 141 142 /* edac sysfs device control */ 143 struct kobject kobj; 144 }; 145 146 147 /* 148 * Abstract edac_device control info structure 149 * 150 */ 151 struct edac_device_ctl_info { 152 /* for global list of edac_device_ctl_info structs */ 153 struct list_head link; 154 155 struct module *owner; /* Module owner of this control struct */ 156 157 int dev_idx; 158 159 /* Per instance controls for this edac_device */ 160 int log_ue; /* boolean for logging UEs */ 161 int log_ce; /* boolean for logging CEs */ 162 int panic_on_ue; /* boolean for panic'ing on an UE */ 163 unsigned poll_msec; /* number of milliseconds to poll interval */ 164 unsigned long delay; /* number of jiffies for poll_msec */ 165 166 /* Additional top controller level attributes, but specified 167 * by the low level driver. 168 * 169 * Set by the low level driver to provide attributes at the 170 * controller level, same level as 'ue_count' and 'ce_count' above. 171 * An array of structures, NULL terminated 172 * 173 * If attributes are desired, then set to array of attributes 174 * If no attributes are desired, leave NULL 175 */ 176 struct edac_dev_sysfs_attribute *sysfs_attributes; 177 178 /* pointer to main 'edac' subsys in sysfs */ 179 struct bus_type *edac_subsys; 180 181 /* the internal state of this controller instance */ 182 int op_state; 183 /* work struct for this instance */ 184 struct delayed_work work; 185 186 /* pointer to edac polling checking routine: 187 * If NOT NULL: points to polling check routine 188 * If NULL: Then assumes INTERRUPT operation, where 189 * MC driver will receive events 190 */ 191 void (*edac_check) (struct edac_device_ctl_info * edac_dev); 192 193 struct device *dev; /* pointer to device structure */ 194 195 const char *mod_name; /* module name */ 196 const char *ctl_name; /* edac controller name */ 197 const char *dev_name; /* pci/platform/etc... name */ 198 199 void *pvt_info; /* pointer to 'private driver' info */ 200 201 unsigned long start_time; /* edac_device load start time (jiffies) */ 202 203 struct completion removal_complete; 204 205 /* sysfs top name under 'edac' directory 206 * and instance name: 207 * cpu/cpu0/... 208 * cpu/cpu1/... 209 * cpu/cpu2/... 210 * ... 211 */ 212 char name[EDAC_DEVICE_NAME_LEN + 1]; 213 214 /* Number of instances supported on this control structure 215 * and the array of those instances 216 */ 217 u32 nr_instances; 218 struct edac_device_instance *instances; 219 220 /* Event counters for the this whole EDAC Device */ 221 struct edac_device_counter counters; 222 223 /* edac sysfs device control for the 'name' 224 * device this structure controls 225 */ 226 struct kobject kobj; 227 }; 228 229 /* To get from the instance's wq to the beginning of the ctl structure */ 230 #define to_edac_mem_ctl_work(w) \ 231 container_of(w, struct mem_ctl_info, work) 232 233 #define to_edac_device_ctl_work(w) \ 234 container_of(w,struct edac_device_ctl_info,work) 235 236 /* 237 * The alloc() and free() functions for the 'edac_device' control info 238 * structure. A MC driver will allocate one of these for each edac_device 239 * it is going to control/register with the EDAC CORE. 240 */ 241 extern struct edac_device_ctl_info *edac_device_alloc_ctl_info( 242 unsigned sizeof_private, 243 char *edac_device_name, unsigned nr_instances, 244 char *edac_block_name, unsigned nr_blocks, 245 unsigned offset_value, 246 struct edac_dev_sysfs_block_attribute *block_attributes, 247 unsigned nr_attribs, 248 int device_index); 249 250 /* The offset value can be: 251 * -1 indicating no offset value 252 * 0 for zero-based block numbers 253 * 1 for 1-based block number 254 * other for other-based block number 255 */ 256 #define BLOCK_OFFSET_VALUE_OFF ((unsigned) -1) 257 258 extern void edac_device_free_ctl_info(struct edac_device_ctl_info *ctl_info); 259 260 /** 261 * edac_device_add_device - Insert the 'edac_dev' structure into the 262 * edac_device global list and create sysfs entries associated with 263 * edac_device structure. 264 * 265 * @edac_dev: pointer to edac_device structure to be added to the list 266 * 'edac_device' structure. 267 * 268 * Returns: 269 * 0 on Success, or an error code on failure 270 */ 271 extern int edac_device_add_device(struct edac_device_ctl_info *edac_dev); 272 273 /** 274 * edac_device_del_device - Remove sysfs entries for specified edac_device 275 * structure and then remove edac_device structure from global list 276 * 277 * @dev: 278 * Pointer to struct &device representing the edac device 279 * structure to remove. 280 * 281 * Returns: 282 * Pointer to removed edac_device structure, 283 * or %NULL if device not found. 284 */ 285 extern struct edac_device_ctl_info *edac_device_del_device(struct device *dev); 286 287 /** 288 * edac_device_handle_ce_count - Log correctable errors. 289 * 290 * @edac_dev: pointer to struct &edac_device_ctl_info 291 * @inst_nr: number of the instance where the CE error happened 292 * @count: Number of errors to log. 293 * @block_nr: number of the block where the CE error happened 294 * @msg: message to be printed 295 */ 296 void edac_device_handle_ce_count(struct edac_device_ctl_info *edac_dev, 297 unsigned int count, int inst_nr, int block_nr, 298 const char *msg); 299 300 /** 301 * edac_device_handle_ue_count - Log uncorrectable errors. 302 * 303 * @edac_dev: pointer to struct &edac_device_ctl_info 304 * @inst_nr: number of the instance where the CE error happened 305 * @count: Number of errors to log. 306 * @block_nr: number of the block where the CE error happened 307 * @msg: message to be printed 308 */ 309 void edac_device_handle_ue_count(struct edac_device_ctl_info *edac_dev, 310 unsigned int count, int inst_nr, int block_nr, 311 const char *msg); 312 313 /** 314 * edac_device_handle_ce(): Log a single correctable error 315 * 316 * @edac_dev: pointer to struct &edac_device_ctl_info 317 * @inst_nr: number of the instance where the CE error happened 318 * @block_nr: number of the block where the CE error happened 319 * @msg: message to be printed 320 */ 321 static inline void 322 edac_device_handle_ce(struct edac_device_ctl_info *edac_dev, int inst_nr, 323 int block_nr, const char *msg) 324 { 325 edac_device_handle_ce_count(edac_dev, 1, inst_nr, block_nr, msg); 326 } 327 328 /** 329 * edac_device_handle_ue(): Log a single uncorrectable error 330 * 331 * @edac_dev: pointer to struct &edac_device_ctl_info 332 * @inst_nr: number of the instance where the UE error happened 333 * @block_nr: number of the block where the UE error happened 334 * @msg: message to be printed 335 */ 336 static inline void 337 edac_device_handle_ue(struct edac_device_ctl_info *edac_dev, int inst_nr, 338 int block_nr, const char *msg) 339 { 340 edac_device_handle_ue_count(edac_dev, 1, inst_nr, block_nr, msg); 341 } 342 343 /** 344 * edac_device_alloc_index: Allocate a unique device index number 345 * 346 * Returns: 347 * allocated index number 348 */ 349 extern int edac_device_alloc_index(void); 350 extern const char *edac_layer_name[]; 351 #endif 352