1/* 2 * Defines, structures, APIs for edac_mc module 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_MC_H_ 23#define _EDAC_MC_H_ 24 25#include <linux/kernel.h> 26#include <linux/types.h> 27#include <linux/module.h> 28#include <linux/spinlock.h> 29#include <linux/smp.h> 30#include <linux/pci.h> 31#include <linux/time.h> 32#include <linux/nmi.h> 33#include <linux/rcupdate.h> 34#include <linux/completion.h> 35#include <linux/kobject.h> 36#include <linux/platform_device.h> 37#include <linux/workqueue.h> 38#include <linux/edac.h> 39 40#if PAGE_SHIFT < 20 41#define PAGES_TO_MiB(pages) ((pages) >> (20 - PAGE_SHIFT)) 42#define MiB_TO_PAGES(mb) ((mb) << (20 - PAGE_SHIFT)) 43#else /* PAGE_SHIFT > 20 */ 44#define PAGES_TO_MiB(pages) ((pages) << (PAGE_SHIFT - 20)) 45#define MiB_TO_PAGES(mb) ((mb) >> (PAGE_SHIFT - 20)) 46#endif 47 48#define edac_printk(level, prefix, fmt, arg...) \ 49 printk(level "EDAC " prefix ": " fmt, ##arg) 50 51#define edac_mc_printk(mci, level, fmt, arg...) \ 52 printk(level "EDAC MC%d: " fmt, mci->mc_idx, ##arg) 53 54#define edac_mc_chipset_printk(mci, level, prefix, fmt, arg...) \ 55 printk(level "EDAC " prefix " MC%d: " fmt, mci->mc_idx, ##arg) 56 57#define edac_device_printk(ctl, level, fmt, arg...) \ 58 printk(level "EDAC DEVICE%d: " fmt, ctl->dev_idx, ##arg) 59 60#define edac_pci_printk(ctl, level, fmt, arg...) \ 61 printk(level "EDAC PCI%d: " fmt, ctl->pci_idx, ##arg) 62 63/* prefixes for edac_printk() and edac_mc_printk() */ 64#define EDAC_MC "MC" 65#define EDAC_PCI "PCI" 66#define EDAC_DEBUG "DEBUG" 67 68extern const char * const edac_mem_types[]; 69 70#ifdef CONFIG_EDAC_DEBUG 71extern int edac_debug_level; 72 73#define edac_dbg(level, fmt, ...) \ 74do { \ 75 if (level <= edac_debug_level) \ 76 edac_printk(KERN_DEBUG, EDAC_DEBUG, \ 77 "%s: " fmt, __func__, ##__VA_ARGS__); \ 78} while (0) 79 80#else /* !CONFIG_EDAC_DEBUG */ 81 82#define edac_dbg(level, fmt, ...) \ 83do { \ 84 if (0) \ 85 edac_printk(KERN_DEBUG, EDAC_DEBUG, \ 86 "%s: " fmt, __func__, ##__VA_ARGS__); \ 87} while (0) 88 89#endif /* !CONFIG_EDAC_DEBUG */ 90 91#define PCI_VEND_DEV(vend, dev) PCI_VENDOR_ID_ ## vend, \ 92 PCI_DEVICE_ID_ ## vend ## _ ## dev 93 94#define edac_dev_name(dev) (dev)->dev_name 95 96#define to_mci(k) container_of(k, struct mem_ctl_info, dev) 97 98/** 99 * edac_mc_alloc() - Allocate and partially fill a struct &mem_ctl_info. 100 * 101 * @mc_num: Memory controller number 102 * @n_layers: Number of MC hierarchy layers 103 * @layers: Describes each layer as seen by the Memory Controller 104 * @sz_pvt: size of private storage needed 105 * 106 * 107 * Everything is kmalloc'ed as one big chunk - more efficient. 108 * Only can be used if all structures have the same lifetime - otherwise 109 * you have to allocate and initialize your own structures. 110 * 111 * Use edac_mc_free() to free mc structures allocated by this function. 112 * 113 * .. note:: 114 * 115 * drivers handle multi-rank memories in different ways: in some 116 * drivers, one multi-rank memory stick is mapped as one entry, while, in 117 * others, a single multi-rank memory stick would be mapped into several 118 * entries. Currently, this function will allocate multiple struct dimm_info 119 * on such scenarios, as grouping the multiple ranks require drivers change. 120 * 121 * Returns: 122 * On success, return a pointer to struct mem_ctl_info pointer; 123 * %NULL otherwise 124 */ 125struct mem_ctl_info *edac_mc_alloc(unsigned mc_num, 126 unsigned n_layers, 127 struct edac_mc_layer *layers, 128 unsigned sz_pvt); 129 130/** 131 * edac_get_owner - Return the owner's mod_name of EDAC MC 132 * 133 * Returns: 134 * Pointer to mod_name string when EDAC MC is owned. NULL otherwise. 135 */ 136extern const char *edac_get_owner(void); 137 138/* 139 * edac_mc_add_mc_with_groups() - Insert the @mci structure into the mci 140 * global list and create sysfs entries associated with @mci structure. 141 * 142 * @mci: pointer to the mci structure to be added to the list 143 * @groups: optional attribute groups for the driver-specific sysfs entries 144 * 145 * Returns: 146 * 0 on Success, or an error code on failure 147 */ 148extern int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci, 149 const struct attribute_group **groups); 150#define edac_mc_add_mc(mci) edac_mc_add_mc_with_groups(mci, NULL) 151 152/** 153 * edac_mc_free() - Frees a previously allocated @mci structure 154 * 155 * @mci: pointer to a struct mem_ctl_info structure 156 */ 157extern void edac_mc_free(struct mem_ctl_info *mci); 158 159/** 160 * edac_has_mcs() - Check if any MCs have been allocated. 161 * 162 * Returns: 163 * True if MC instances have been registered successfully. 164 * False otherwise. 165 */ 166extern bool edac_has_mcs(void); 167 168/** 169 * edac_mc_find() - Search for a mem_ctl_info structure whose index is @idx. 170 * 171 * @idx: index to be seek 172 * 173 * If found, return a pointer to the structure. 174 * Else return NULL. 175 */ 176extern struct mem_ctl_info *edac_mc_find(int idx); 177 178/** 179 * find_mci_by_dev() - Scan list of controllers looking for the one that 180 * manages the @dev device. 181 * 182 * @dev: pointer to a struct device related with the MCI 183 * 184 * Returns: on success, returns a pointer to struct &mem_ctl_info; 185 * %NULL otherwise. 186 */ 187extern struct mem_ctl_info *find_mci_by_dev(struct device *dev); 188 189/** 190 * edac_mc_del_mc() - Remove sysfs entries for mci structure associated with 191 * @dev and remove mci structure from global list. 192 * 193 * @dev: Pointer to struct &device representing mci structure to remove. 194 * 195 * Returns: pointer to removed mci structure, or %NULL if device not found. 196 */ 197extern struct mem_ctl_info *edac_mc_del_mc(struct device *dev); 198 199/** 200 * edac_mc_find_csrow_by_page() - Ancillary routine to identify what csrow 201 * contains a memory page. 202 * 203 * @mci: pointer to a struct mem_ctl_info structure 204 * @page: memory page to find 205 * 206 * Returns: on success, returns the csrow. -1 if not found. 207 */ 208extern int edac_mc_find_csrow_by_page(struct mem_ctl_info *mci, 209 unsigned long page); 210 211/** 212 * edac_raw_mc_handle_error() - Reports a memory event to userspace without 213 * doing anything to discover the error location. 214 * 215 * @type: severity of the error (CE/UE/Fatal) 216 * @mci: a struct mem_ctl_info pointer 217 * @e: error description 218 * 219 * This raw function is used internally by edac_mc_handle_error(). It should 220 * only be called directly when the hardware error come directly from BIOS, 221 * like in the case of APEI GHES driver. 222 */ 223void edac_raw_mc_handle_error(const enum hw_event_mc_err_type type, 224 struct mem_ctl_info *mci, 225 struct edac_raw_error_desc *e); 226 227/** 228 * edac_mc_handle_error() - Reports a memory event to userspace. 229 * 230 * @type: severity of the error (CE/UE/Fatal) 231 * @mci: a struct mem_ctl_info pointer 232 * @error_count: Number of errors of the same type 233 * @page_frame_number: mem page where the error occurred 234 * @offset_in_page: offset of the error inside the page 235 * @syndrome: ECC syndrome 236 * @top_layer: Memory layer[0] position 237 * @mid_layer: Memory layer[1] position 238 * @low_layer: Memory layer[2] position 239 * @msg: Message meaningful to the end users that 240 * explains the event 241 * @other_detail: Technical details about the event that 242 * may help hardware manufacturers and 243 * EDAC developers to analyse the event 244 */ 245void edac_mc_handle_error(const enum hw_event_mc_err_type type, 246 struct mem_ctl_info *mci, 247 const u16 error_count, 248 const unsigned long page_frame_number, 249 const unsigned long offset_in_page, 250 const unsigned long syndrome, 251 const int top_layer, 252 const int mid_layer, 253 const int low_layer, 254 const char *msg, 255 const char *other_detail); 256 257/* 258 * edac misc APIs 259 */ 260extern char *edac_op_state_to_string(int op_state); 261 262#endif /* _EDAC_MC_H_ */ 263