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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 | ||
68 | extern const char * const edac_mem_types[]; | |
69 | ||
70 | #ifdef CONFIG_EDAC_DEBUG | |
71 | extern int edac_debug_level; | |
72 | ||
73 | #define edac_dbg(level, fmt, ...) \ | |
74 | do { \ | |
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, ...) \ | |
83 | do { \ | |
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 | */ | |
125 | struct 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_mc_add_mc_with_groups() - Insert the @mci structure into the mci | |
132 | * global list and create sysfs entries associated with @mci structure. | |
133 | * | |
134 | * @mci: pointer to the mci structure to be added to the list | |
135 | * @groups: optional attribute groups for the driver-specific sysfs entries | |
136 | * | |
137 | * Returns: | |
138 | * 0 on Success, or an error code on failure | |
139 | */ | |
140 | extern int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci, | |
141 | const struct attribute_group **groups); | |
142 | #define edac_mc_add_mc(mci) edac_mc_add_mc_with_groups(mci, NULL) | |
143 | ||
144 | /** | |
145 | * edac_mc_free() - Frees a previously allocated @mci structure | |
146 | * | |
147 | * @mci: pointer to a struct mem_ctl_info structure | |
148 | */ | |
149 | extern void edac_mc_free(struct mem_ctl_info *mci); | |
150 | ||
151 | /** | |
152 | * edac_mc_find() - Search for a mem_ctl_info structure whose index is @idx. | |
153 | * | |
154 | * @idx: index to be seek | |
155 | * | |
156 | * If found, return a pointer to the structure. | |
157 | * Else return NULL. | |
158 | */ | |
159 | extern struct mem_ctl_info *edac_mc_find(int idx); | |
160 | ||
161 | /** | |
162 | * find_mci_by_dev() - Scan list of controllers looking for the one that | |
163 | * manages the @dev device. | |
164 | * | |
165 | * @dev: pointer to a struct device related with the MCI | |
166 | * | |
167 | * Returns: on success, returns a pointer to struct &mem_ctl_info; | |
168 | * %NULL otherwise. | |
169 | */ | |
170 | extern struct mem_ctl_info *find_mci_by_dev(struct device *dev); | |
171 | ||
172 | /** | |
173 | * edac_mc_del_mc() - Remove sysfs entries for mci structure associated with | |
174 | * @dev and remove mci structure from global list. | |
175 | * | |
176 | * @dev: Pointer to struct &device representing mci structure to remove. | |
177 | * | |
178 | * Returns: pointer to removed mci structure, or %NULL if device not found. | |
179 | */ | |
180 | extern struct mem_ctl_info *edac_mc_del_mc(struct device *dev); | |
181 | ||
182 | /** | |
183 | * edac_mc_find_csrow_by_page() - Ancillary routine to identify what csrow | |
184 | * contains a memory page. | |
185 | * | |
186 | * @mci: pointer to a struct mem_ctl_info structure | |
187 | * @page: memory page to find | |
188 | * | |
189 | * Returns: on success, returns the csrow. -1 if not found. | |
190 | */ | |
191 | extern int edac_mc_find_csrow_by_page(struct mem_ctl_info *mci, | |
192 | unsigned long page); | |
193 | ||
194 | /** | |
195 | * edac_raw_mc_handle_error() - Reports a memory event to userspace without | |
196 | * doing anything to discover the error location. | |
197 | * | |
198 | * @type: severity of the error (CE/UE/Fatal) | |
199 | * @mci: a struct mem_ctl_info pointer | |
200 | * @e: error description | |
201 | * | |
202 | * This raw function is used internally by edac_mc_handle_error(). It should | |
203 | * only be called directly when the hardware error come directly from BIOS, | |
204 | * like in the case of APEI GHES driver. | |
205 | */ | |
206 | void edac_raw_mc_handle_error(const enum hw_event_mc_err_type type, | |
207 | struct mem_ctl_info *mci, | |
208 | struct edac_raw_error_desc *e); | |
209 | ||
210 | /** | |
211 | * edac_mc_handle_error() - Reports a memory event to userspace. | |
212 | * | |
213 | * @type: severity of the error (CE/UE/Fatal) | |
214 | * @mci: a struct mem_ctl_info pointer | |
215 | * @error_count: Number of errors of the same type | |
216 | * @page_frame_number: mem page where the error occurred | |
217 | * @offset_in_page: offset of the error inside the page | |
218 | * @syndrome: ECC syndrome | |
219 | * @top_layer: Memory layer[0] position | |
220 | * @mid_layer: Memory layer[1] position | |
221 | * @low_layer: Memory layer[2] position | |
222 | * @msg: Message meaningful to the end users that | |
223 | * explains the event | |
224 | * @other_detail: Technical details about the event that | |
225 | * may help hardware manufacturers and | |
226 | * EDAC developers to analyse the event | |
227 | */ | |
228 | void edac_mc_handle_error(const enum hw_event_mc_err_type type, | |
229 | struct mem_ctl_info *mci, | |
230 | const u16 error_count, | |
231 | const unsigned long page_frame_number, | |
232 | const unsigned long offset_in_page, | |
233 | const unsigned long syndrome, | |
234 | const int top_layer, | |
235 | const int mid_layer, | |
236 | const int low_layer, | |
237 | const char *msg, | |
238 | const char *other_detail); | |
239 | ||
240 | /* | |
241 | * edac misc APIs | |
242 | */ | |
243 | extern char *edac_op_state_to_string(int op_state); | |
244 | ||
245 | #endif /* _EDAC_MC_H_ */ |