Commit | Line | Data |
---|---|---|
da9bb1d2 AC |
1 | /* |
2 | * edac_mc kernel module | |
49c0dab7 | 3 | * (C) 2005, 2006 Linux Networx (http://lnxi.com) |
da9bb1d2 AC |
4 | * This file may be distributed under the terms of the |
5 | * GNU General Public License. | |
6 | * | |
7 | * Written by Thayne Harbaugh | |
8 | * Based on work by Dan Hollis <goemon at anime dot net> and others. | |
9 | * http://www.anime.net/~goemon/linux-ecc/ | |
10 | * | |
11 | * Modified by Dave Peterson and Doug Thompson | |
12 | * | |
13 | */ | |
14 | ||
da9bb1d2 AC |
15 | #include <linux/module.h> |
16 | #include <linux/proc_fs.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/smp.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/sysctl.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/timer.h> | |
24 | #include <linux/slab.h> | |
25 | #include <linux/jiffies.h> | |
26 | #include <linux/spinlock.h> | |
27 | #include <linux/list.h> | |
28 | #include <linux/sysdev.h> | |
29 | #include <linux/ctype.h> | |
c0d12172 | 30 | #include <linux/edac.h> |
da9bb1d2 AC |
31 | #include <asm/uaccess.h> |
32 | #include <asm/page.h> | |
33 | #include <asm/edac.h> | |
20bcb7a8 | 34 | #include "edac_core.h" |
7c9281d7 | 35 | #include "edac_module.h" |
da9bb1d2 | 36 | |
da9bb1d2 | 37 | /* lock to memory controller's control array */ |
63b7df91 | 38 | static DEFINE_MUTEX(mem_ctls_mutex); |
da9bb1d2 AC |
39 | static struct list_head mc_devices = LIST_HEAD_INIT(mc_devices); |
40 | ||
da9bb1d2 AC |
41 | #ifdef CONFIG_EDAC_DEBUG |
42 | ||
2da1c119 | 43 | static void edac_mc_dump_channel(struct channel_info *chan) |
da9bb1d2 AC |
44 | { |
45 | debugf4("\tchannel = %p\n", chan); | |
46 | debugf4("\tchannel->chan_idx = %d\n", chan->chan_idx); | |
47 | debugf4("\tchannel->ce_count = %d\n", chan->ce_count); | |
48 | debugf4("\tchannel->label = '%s'\n", chan->label); | |
49 | debugf4("\tchannel->csrow = %p\n\n", chan->csrow); | |
50 | } | |
51 | ||
2da1c119 | 52 | static void edac_mc_dump_csrow(struct csrow_info *csrow) |
da9bb1d2 AC |
53 | { |
54 | debugf4("\tcsrow = %p\n", csrow); | |
55 | debugf4("\tcsrow->csrow_idx = %d\n", csrow->csrow_idx); | |
079708b9 | 56 | debugf4("\tcsrow->first_page = 0x%lx\n", csrow->first_page); |
da9bb1d2 AC |
57 | debugf4("\tcsrow->last_page = 0x%lx\n", csrow->last_page); |
58 | debugf4("\tcsrow->page_mask = 0x%lx\n", csrow->page_mask); | |
59 | debugf4("\tcsrow->nr_pages = 0x%x\n", csrow->nr_pages); | |
079708b9 | 60 | debugf4("\tcsrow->nr_channels = %d\n", csrow->nr_channels); |
da9bb1d2 AC |
61 | debugf4("\tcsrow->channels = %p\n", csrow->channels); |
62 | debugf4("\tcsrow->mci = %p\n\n", csrow->mci); | |
63 | } | |
64 | ||
2da1c119 | 65 | static void edac_mc_dump_mci(struct mem_ctl_info *mci) |
da9bb1d2 AC |
66 | { |
67 | debugf3("\tmci = %p\n", mci); | |
68 | debugf3("\tmci->mtype_cap = %lx\n", mci->mtype_cap); | |
69 | debugf3("\tmci->edac_ctl_cap = %lx\n", mci->edac_ctl_cap); | |
70 | debugf3("\tmci->edac_cap = %lx\n", mci->edac_cap); | |
71 | debugf4("\tmci->edac_check = %p\n", mci->edac_check); | |
72 | debugf3("\tmci->nr_csrows = %d, csrows = %p\n", | |
73 | mci->nr_csrows, mci->csrows); | |
37f04581 | 74 | debugf3("\tdev = %p\n", mci->dev); |
079708b9 | 75 | debugf3("\tmod_name:ctl_name = %s:%s\n", mci->mod_name, mci->ctl_name); |
da9bb1d2 AC |
76 | debugf3("\tpvt_info = %p\n\n", mci->pvt_info); |
77 | } | |
78 | ||
079708b9 | 79 | #endif /* CONFIG_EDAC_DEBUG */ |
da9bb1d2 AC |
80 | |
81 | /* 'ptr' points to a possibly unaligned item X such that sizeof(X) is 'size'. | |
82 | * Adjust 'ptr' so that its alignment is at least as stringent as what the | |
83 | * compiler would provide for X and return the aligned result. | |
84 | * | |
85 | * If 'size' is a constant, the compiler will optimize this whole function | |
86 | * down to either a no-op or the addition of a constant to the value of 'ptr'. | |
87 | */ | |
079708b9 | 88 | char *edac_align_ptr(void *ptr, unsigned size) |
da9bb1d2 AC |
89 | { |
90 | unsigned align, r; | |
91 | ||
92 | /* Here we assume that the alignment of a "long long" is the most | |
93 | * stringent alignment that the compiler will ever provide by default. | |
94 | * As far as I know, this is a reasonable assumption. | |
95 | */ | |
96 | if (size > sizeof(long)) | |
97 | align = sizeof(long long); | |
98 | else if (size > sizeof(int)) | |
99 | align = sizeof(long); | |
100 | else if (size > sizeof(short)) | |
101 | align = sizeof(int); | |
102 | else if (size > sizeof(char)) | |
103 | align = sizeof(short); | |
104 | else | |
079708b9 | 105 | return (char *)ptr; |
da9bb1d2 AC |
106 | |
107 | r = size % align; | |
108 | ||
109 | if (r == 0) | |
079708b9 | 110 | return (char *)ptr; |
da9bb1d2 | 111 | |
079708b9 | 112 | return (char *)(((unsigned long)ptr) + align - r); |
da9bb1d2 AC |
113 | } |
114 | ||
da9bb1d2 AC |
115 | /** |
116 | * edac_mc_alloc: Allocate a struct mem_ctl_info structure | |
117 | * @size_pvt: size of private storage needed | |
118 | * @nr_csrows: Number of CWROWS needed for this MC | |
119 | * @nr_chans: Number of channels for the MC | |
120 | * | |
121 | * Everything is kmalloc'ed as one big chunk - more efficient. | |
122 | * Only can be used if all structures have the same lifetime - otherwise | |
123 | * you have to allocate and initialize your own structures. | |
124 | * | |
125 | * Use edac_mc_free() to free mc structures allocated by this function. | |
126 | * | |
127 | * Returns: | |
128 | * NULL allocation failed | |
129 | * struct mem_ctl_info pointer | |
130 | */ | |
131 | struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt, unsigned nr_csrows, | |
079708b9 | 132 | unsigned nr_chans) |
da9bb1d2 AC |
133 | { |
134 | struct mem_ctl_info *mci; | |
135 | struct csrow_info *csi, *csrow; | |
136 | struct channel_info *chi, *chp, *chan; | |
137 | void *pvt; | |
138 | unsigned size; | |
139 | int row, chn; | |
140 | ||
141 | /* Figure out the offsets of the various items from the start of an mc | |
142 | * structure. We want the alignment of each item to be at least as | |
143 | * stringent as what the compiler would provide if we could simply | |
144 | * hardcode everything into a single struct. | |
145 | */ | |
079708b9 | 146 | mci = (struct mem_ctl_info *)0; |
e27e3dac | 147 | csi = (struct csrow_info *)edac_align_ptr(&mci[1], sizeof(*csi)); |
da9bb1d2 | 148 | chi = (struct channel_info *) |
079708b9 | 149 | edac_align_ptr(&csi[nr_csrows], sizeof(*chi)); |
e27e3dac | 150 | pvt = edac_align_ptr(&chi[nr_chans * nr_csrows], sz_pvt); |
079708b9 | 151 | size = ((unsigned long)pvt) + sz_pvt; |
da9bb1d2 AC |
152 | |
153 | if ((mci = kmalloc(size, GFP_KERNEL)) == NULL) | |
154 | return NULL; | |
155 | ||
156 | /* Adjust pointers so they point within the memory we just allocated | |
157 | * rather than an imaginary chunk of memory located at address 0. | |
158 | */ | |
079708b9 DT |
159 | csi = (struct csrow_info *)(((char *)mci) + ((unsigned long)csi)); |
160 | chi = (struct channel_info *)(((char *)mci) + ((unsigned long)chi)); | |
161 | pvt = sz_pvt ? (((char *)mci) + ((unsigned long)pvt)) : NULL; | |
da9bb1d2 | 162 | |
079708b9 | 163 | memset(mci, 0, size); /* clear all fields */ |
da9bb1d2 AC |
164 | mci->csrows = csi; |
165 | mci->pvt_info = pvt; | |
166 | mci->nr_csrows = nr_csrows; | |
167 | ||
168 | for (row = 0; row < nr_csrows; row++) { | |
169 | csrow = &csi[row]; | |
170 | csrow->csrow_idx = row; | |
171 | csrow->mci = mci; | |
172 | csrow->nr_channels = nr_chans; | |
173 | chp = &chi[row * nr_chans]; | |
174 | csrow->channels = chp; | |
175 | ||
176 | for (chn = 0; chn < nr_chans; chn++) { | |
177 | chan = &chp[chn]; | |
178 | chan->chan_idx = chn; | |
179 | chan->csrow = csrow; | |
180 | } | |
181 | } | |
182 | ||
81d87cb1 DJ |
183 | mci->op_state = OP_ALLOC; |
184 | ||
da9bb1d2 AC |
185 | return mci; |
186 | } | |
079708b9 | 187 | |
9110540f | 188 | EXPORT_SYMBOL_GPL(edac_mc_alloc); |
da9bb1d2 | 189 | |
da9bb1d2 AC |
190 | /** |
191 | * edac_mc_free: Free a previously allocated 'mci' structure | |
192 | * @mci: pointer to a struct mem_ctl_info structure | |
da9bb1d2 AC |
193 | */ |
194 | void edac_mc_free(struct mem_ctl_info *mci) | |
195 | { | |
472678eb | 196 | kfree(mci); |
da9bb1d2 | 197 | } |
079708b9 | 198 | |
9110540f | 199 | EXPORT_SYMBOL_GPL(edac_mc_free); |
da9bb1d2 | 200 | |
37f04581 | 201 | static struct mem_ctl_info *find_mci_by_dev(struct device *dev) |
da9bb1d2 AC |
202 | { |
203 | struct mem_ctl_info *mci; | |
204 | struct list_head *item; | |
205 | ||
537fba28 | 206 | debugf3("%s()\n", __func__); |
da9bb1d2 AC |
207 | |
208 | list_for_each(item, &mc_devices) { | |
209 | mci = list_entry(item, struct mem_ctl_info, link); | |
210 | ||
37f04581 | 211 | if (mci->dev == dev) |
da9bb1d2 AC |
212 | return mci; |
213 | } | |
214 | ||
215 | return NULL; | |
216 | } | |
217 | ||
81d87cb1 DJ |
218 | /* |
219 | * handler for EDAC to check if NMI type handler has asserted interrupt | |
220 | */ | |
221 | static int edac_mc_assert_error_check_and_clear(void) | |
222 | { | |
66ee2f94 | 223 | int old_state; |
81d87cb1 | 224 | |
079708b9 | 225 | if (edac_op_state == EDAC_OPSTATE_POLL) |
81d87cb1 DJ |
226 | return 1; |
227 | ||
66ee2f94 DJ |
228 | old_state = edac_err_assert; |
229 | edac_err_assert = 0; | |
81d87cb1 | 230 | |
66ee2f94 | 231 | return old_state; |
81d87cb1 DJ |
232 | } |
233 | ||
234 | /* | |
235 | * edac_mc_workq_function | |
236 | * performs the operation scheduled by a workq request | |
237 | */ | |
81d87cb1 DJ |
238 | static void edac_mc_workq_function(struct work_struct *work_req) |
239 | { | |
079708b9 | 240 | struct delayed_work *d_work = (struct delayed_work *)work_req; |
81d87cb1 | 241 | struct mem_ctl_info *mci = to_edac_mem_ctl_work(d_work); |
81d87cb1 DJ |
242 | |
243 | mutex_lock(&mem_ctls_mutex); | |
244 | ||
245 | /* Only poll controllers that are running polled and have a check */ | |
246 | if (edac_mc_assert_error_check_and_clear() && (mci->edac_check != NULL)) | |
247 | mci->edac_check(mci); | |
248 | ||
249 | /* | |
250 | * FIXME: temp place holder for PCI checks, | |
251 | * goes away when we break out PCI | |
252 | */ | |
253 | edac_pci_do_parity_check(); | |
254 | ||
255 | mutex_unlock(&mem_ctls_mutex); | |
256 | ||
257 | /* Reschedule */ | |
4de78c68 | 258 | queue_delayed_work(edac_workqueue, &mci->work, |
079708b9 | 259 | msecs_to_jiffies(edac_mc_get_poll_msec())); |
81d87cb1 DJ |
260 | } |
261 | ||
262 | /* | |
263 | * edac_mc_workq_setup | |
264 | * initialize a workq item for this mci | |
265 | * passing in the new delay period in msec | |
266 | */ | |
267 | void edac_mc_workq_setup(struct mem_ctl_info *mci, unsigned msec) | |
268 | { | |
269 | debugf0("%s()\n", __func__); | |
270 | ||
81d87cb1 | 271 | INIT_DELAYED_WORK(&mci->work, edac_mc_workq_function); |
81d87cb1 DJ |
272 | queue_delayed_work(edac_workqueue, &mci->work, msecs_to_jiffies(msec)); |
273 | } | |
274 | ||
275 | /* | |
276 | * edac_mc_workq_teardown | |
277 | * stop the workq processing on this mci | |
278 | */ | |
279 | void edac_mc_workq_teardown(struct mem_ctl_info *mci) | |
280 | { | |
281 | int status; | |
282 | ||
283 | status = cancel_delayed_work(&mci->work); | |
284 | if (status == 0) { | |
285 | /* workq instance might be running, wait for it */ | |
286 | flush_workqueue(edac_workqueue); | |
287 | } | |
288 | } | |
289 | ||
290 | /* | |
291 | * edac_reset_delay_period | |
292 | */ | |
293 | ||
294 | void edac_reset_delay_period(struct mem_ctl_info *mci, unsigned long value) | |
295 | { | |
296 | mutex_lock(&mem_ctls_mutex); | |
297 | ||
298 | /* cancel the current workq request */ | |
299 | edac_mc_workq_teardown(mci); | |
300 | ||
301 | /* restart the workq request, with new delay value */ | |
302 | edac_mc_workq_setup(mci, value); | |
303 | ||
304 | mutex_unlock(&mem_ctls_mutex); | |
305 | } | |
306 | ||
2d7bbb91 DT |
307 | /* Return 0 on success, 1 on failure. |
308 | * Before calling this function, caller must | |
309 | * assign a unique value to mci->mc_idx. | |
310 | */ | |
079708b9 | 311 | static int add_mc_to_global_list(struct mem_ctl_info *mci) |
da9bb1d2 AC |
312 | { |
313 | struct list_head *item, *insert_before; | |
314 | struct mem_ctl_info *p; | |
da9bb1d2 | 315 | |
2d7bbb91 | 316 | insert_before = &mc_devices; |
da9bb1d2 | 317 | |
2d7bbb91 DT |
318 | if (unlikely((p = find_mci_by_dev(mci->dev)) != NULL)) |
319 | goto fail0; | |
da9bb1d2 | 320 | |
2d7bbb91 DT |
321 | list_for_each(item, &mc_devices) { |
322 | p = list_entry(item, struct mem_ctl_info, link); | |
da9bb1d2 | 323 | |
2d7bbb91 DT |
324 | if (p->mc_idx >= mci->mc_idx) { |
325 | if (unlikely(p->mc_idx == mci->mc_idx)) | |
326 | goto fail1; | |
da9bb1d2 | 327 | |
2d7bbb91 DT |
328 | insert_before = item; |
329 | break; | |
da9bb1d2 | 330 | } |
da9bb1d2 AC |
331 | } |
332 | ||
333 | list_add_tail_rcu(&mci->link, insert_before); | |
c0d12172 | 334 | atomic_inc(&edac_handlers); |
da9bb1d2 | 335 | return 0; |
2d7bbb91 | 336 | |
079708b9 | 337 | fail0: |
2d7bbb91 DT |
338 | edac_printk(KERN_WARNING, EDAC_MC, |
339 | "%s (%s) %s %s already assigned %d\n", p->dev->bus_id, | |
c4192705 | 340 | dev_name(mci), p->mod_name, p->ctl_name, p->mc_idx); |
2d7bbb91 DT |
341 | return 1; |
342 | ||
079708b9 | 343 | fail1: |
2d7bbb91 DT |
344 | edac_printk(KERN_WARNING, EDAC_MC, |
345 | "bug in low-level driver: attempt to assign\n" | |
346 | " duplicate mc_idx %d in %s()\n", p->mc_idx, __func__); | |
347 | return 1; | |
da9bb1d2 AC |
348 | } |
349 | ||
e7ecd891 | 350 | static void complete_mc_list_del(struct rcu_head *head) |
a1d03fcc DP |
351 | { |
352 | struct mem_ctl_info *mci; | |
353 | ||
354 | mci = container_of(head, struct mem_ctl_info, rcu); | |
355 | INIT_LIST_HEAD(&mci->link); | |
356 | complete(&mci->complete); | |
357 | } | |
358 | ||
e7ecd891 | 359 | static void del_mc_from_global_list(struct mem_ctl_info *mci) |
a1d03fcc | 360 | { |
c0d12172 | 361 | atomic_dec(&edac_handlers); |
a1d03fcc DP |
362 | list_del_rcu(&mci->link); |
363 | init_completion(&mci->complete); | |
364 | call_rcu(&mci->rcu, complete_mc_list_del); | |
365 | wait_for_completion(&mci->complete); | |
366 | } | |
367 | ||
5da0831c DT |
368 | /** |
369 | * edac_mc_find: Search for a mem_ctl_info structure whose index is 'idx'. | |
370 | * | |
371 | * If found, return a pointer to the structure. | |
372 | * Else return NULL. | |
373 | * | |
374 | * Caller must hold mem_ctls_mutex. | |
375 | */ | |
079708b9 | 376 | struct mem_ctl_info *edac_mc_find(int idx) |
5da0831c DT |
377 | { |
378 | struct list_head *item; | |
379 | struct mem_ctl_info *mci; | |
380 | ||
381 | list_for_each(item, &mc_devices) { | |
382 | mci = list_entry(item, struct mem_ctl_info, link); | |
383 | ||
384 | if (mci->mc_idx >= idx) { | |
385 | if (mci->mc_idx == idx) | |
386 | return mci; | |
387 | ||
388 | break; | |
389 | } | |
390 | } | |
391 | ||
392 | return NULL; | |
393 | } | |
079708b9 | 394 | |
5da0831c DT |
395 | EXPORT_SYMBOL(edac_mc_find); |
396 | ||
da9bb1d2 | 397 | /** |
472678eb DP |
398 | * edac_mc_add_mc: Insert the 'mci' structure into the mci global list and |
399 | * create sysfs entries associated with mci structure | |
da9bb1d2 | 400 | * @mci: pointer to the mci structure to be added to the list |
2d7bbb91 | 401 | * @mc_idx: A unique numeric identifier to be assigned to the 'mci' structure. |
da9bb1d2 AC |
402 | * |
403 | * Return: | |
404 | * 0 Success | |
405 | * !0 Failure | |
406 | */ | |
407 | ||
408 | /* FIXME - should a warning be printed if no error detection? correction? */ | |
2d7bbb91 | 409 | int edac_mc_add_mc(struct mem_ctl_info *mci, int mc_idx) |
da9bb1d2 | 410 | { |
537fba28 | 411 | debugf0("%s()\n", __func__); |
2d7bbb91 | 412 | mci->mc_idx = mc_idx; |
da9bb1d2 AC |
413 | #ifdef CONFIG_EDAC_DEBUG |
414 | if (edac_debug_level >= 3) | |
415 | edac_mc_dump_mci(mci); | |
e7ecd891 | 416 | |
da9bb1d2 AC |
417 | if (edac_debug_level >= 4) { |
418 | int i; | |
419 | ||
420 | for (i = 0; i < mci->nr_csrows; i++) { | |
421 | int j; | |
e7ecd891 | 422 | |
da9bb1d2 AC |
423 | edac_mc_dump_csrow(&mci->csrows[i]); |
424 | for (j = 0; j < mci->csrows[i].nr_channels; j++) | |
079708b9 DT |
425 | edac_mc_dump_channel(&mci->csrows[i]. |
426 | channels[j]); | |
da9bb1d2 AC |
427 | } |
428 | } | |
429 | #endif | |
63b7df91 | 430 | mutex_lock(&mem_ctls_mutex); |
da9bb1d2 AC |
431 | |
432 | if (add_mc_to_global_list(mci)) | |
028a7b6d | 433 | goto fail0; |
da9bb1d2 AC |
434 | |
435 | /* set load time so that error rate can be tracked */ | |
436 | mci->start_time = jiffies; | |
437 | ||
9794f33d | 438 | if (edac_create_sysfs_mci_device(mci)) { |
439 | edac_mc_printk(mci, KERN_WARNING, | |
079708b9 | 440 | "failed to create sysfs device\n"); |
9794f33d | 441 | goto fail1; |
442 | } | |
da9bb1d2 | 443 | |
81d87cb1 DJ |
444 | /* If there IS a check routine, then we are running POLLED */ |
445 | if (mci->edac_check != NULL) { | |
446 | /* This instance is NOW RUNNING */ | |
447 | mci->op_state = OP_RUNNING_POLL; | |
448 | ||
449 | edac_mc_workq_setup(mci, edac_mc_get_poll_msec()); | |
450 | } else { | |
451 | mci->op_state = OP_RUNNING_INTERRUPT; | |
452 | } | |
453 | ||
da9bb1d2 | 454 | /* Report action taken */ |
37f04581 | 455 | edac_mc_printk(mci, KERN_INFO, "Giving out device to %s %s: DEV %s\n", |
079708b9 | 456 | mci->mod_name, mci->ctl_name, dev_name(mci)); |
da9bb1d2 | 457 | |
63b7df91 | 458 | mutex_unlock(&mem_ctls_mutex); |
028a7b6d | 459 | return 0; |
da9bb1d2 | 460 | |
079708b9 | 461 | fail1: |
028a7b6d DP |
462 | del_mc_from_global_list(mci); |
463 | ||
079708b9 | 464 | fail0: |
63b7df91 | 465 | mutex_unlock(&mem_ctls_mutex); |
028a7b6d | 466 | return 1; |
da9bb1d2 | 467 | } |
079708b9 | 468 | |
9110540f | 469 | EXPORT_SYMBOL_GPL(edac_mc_add_mc); |
da9bb1d2 | 470 | |
da9bb1d2 | 471 | /** |
472678eb DP |
472 | * edac_mc_del_mc: Remove sysfs entries for specified mci structure and |
473 | * remove mci structure from global list | |
37f04581 | 474 | * @pdev: Pointer to 'struct device' representing mci structure to remove. |
da9bb1d2 | 475 | * |
18dbc337 | 476 | * Return pointer to removed mci structure, or NULL if device not found. |
da9bb1d2 | 477 | */ |
079708b9 | 478 | struct mem_ctl_info *edac_mc_del_mc(struct device *dev) |
da9bb1d2 | 479 | { |
18dbc337 | 480 | struct mem_ctl_info *mci; |
da9bb1d2 | 481 | |
18dbc337 | 482 | debugf0("MC: %s()\n", __func__); |
63b7df91 | 483 | mutex_lock(&mem_ctls_mutex); |
18dbc337 | 484 | |
37f04581 | 485 | if ((mci = find_mci_by_dev(dev)) == NULL) { |
63b7df91 | 486 | mutex_unlock(&mem_ctls_mutex); |
18dbc337 DP |
487 | return NULL; |
488 | } | |
489 | ||
81d87cb1 DJ |
490 | /* marking MCI offline */ |
491 | mci->op_state = OP_OFFLINE; | |
492 | ||
493 | /* flush workq processes */ | |
494 | edac_mc_workq_teardown(mci); | |
495 | ||
18dbc337 | 496 | edac_remove_sysfs_mci_device(mci); |
da9bb1d2 | 497 | del_mc_from_global_list(mci); |
63b7df91 | 498 | mutex_unlock(&mem_ctls_mutex); |
537fba28 | 499 | edac_printk(KERN_INFO, EDAC_MC, |
079708b9 DT |
500 | "Removed device %d for %s %s: DEV %s\n", mci->mc_idx, |
501 | mci->mod_name, mci->ctl_name, dev_name(mci)); | |
18dbc337 | 502 | return mci; |
da9bb1d2 | 503 | } |
079708b9 | 504 | |
9110540f | 505 | EXPORT_SYMBOL_GPL(edac_mc_del_mc); |
da9bb1d2 | 506 | |
2da1c119 AB |
507 | static void edac_mc_scrub_block(unsigned long page, unsigned long offset, |
508 | u32 size) | |
da9bb1d2 AC |
509 | { |
510 | struct page *pg; | |
511 | void *virt_addr; | |
512 | unsigned long flags = 0; | |
513 | ||
537fba28 | 514 | debugf3("%s()\n", __func__); |
da9bb1d2 AC |
515 | |
516 | /* ECC error page was not in our memory. Ignore it. */ | |
079708b9 | 517 | if (!pfn_valid(page)) |
da9bb1d2 AC |
518 | return; |
519 | ||
520 | /* Find the actual page structure then map it and fix */ | |
521 | pg = pfn_to_page(page); | |
522 | ||
523 | if (PageHighMem(pg)) | |
524 | local_irq_save(flags); | |
525 | ||
526 | virt_addr = kmap_atomic(pg, KM_BOUNCE_READ); | |
527 | ||
528 | /* Perform architecture specific atomic scrub operation */ | |
529 | atomic_scrub(virt_addr + offset, size); | |
530 | ||
531 | /* Unmap and complete */ | |
532 | kunmap_atomic(virt_addr, KM_BOUNCE_READ); | |
533 | ||
534 | if (PageHighMem(pg)) | |
535 | local_irq_restore(flags); | |
536 | } | |
537 | ||
da9bb1d2 | 538 | /* FIXME - should return -1 */ |
e7ecd891 | 539 | int edac_mc_find_csrow_by_page(struct mem_ctl_info *mci, unsigned long page) |
da9bb1d2 AC |
540 | { |
541 | struct csrow_info *csrows = mci->csrows; | |
542 | int row, i; | |
543 | ||
537fba28 | 544 | debugf1("MC%d: %s(): 0x%lx\n", mci->mc_idx, __func__, page); |
da9bb1d2 AC |
545 | row = -1; |
546 | ||
547 | for (i = 0; i < mci->nr_csrows; i++) { | |
548 | struct csrow_info *csrow = &csrows[i]; | |
549 | ||
550 | if (csrow->nr_pages == 0) | |
551 | continue; | |
552 | ||
537fba28 DP |
553 | debugf3("MC%d: %s(): first(0x%lx) page(0x%lx) last(0x%lx) " |
554 | "mask(0x%lx)\n", mci->mc_idx, __func__, | |
555 | csrow->first_page, page, csrow->last_page, | |
556 | csrow->page_mask); | |
da9bb1d2 AC |
557 | |
558 | if ((page >= csrow->first_page) && | |
559 | (page <= csrow->last_page) && | |
560 | ((page & csrow->page_mask) == | |
561 | (csrow->first_page & csrow->page_mask))) { | |
562 | row = i; | |
563 | break; | |
564 | } | |
565 | } | |
566 | ||
567 | if (row == -1) | |
537fba28 | 568 | edac_mc_printk(mci, KERN_ERR, |
079708b9 DT |
569 | "could not look up page error address %lx\n", |
570 | (unsigned long)page); | |
da9bb1d2 AC |
571 | |
572 | return row; | |
573 | } | |
079708b9 | 574 | |
9110540f | 575 | EXPORT_SYMBOL_GPL(edac_mc_find_csrow_by_page); |
da9bb1d2 | 576 | |
da9bb1d2 AC |
577 | /* FIXME - setable log (warning/emerg) levels */ |
578 | /* FIXME - integrate with evlog: http://evlog.sourceforge.net/ */ | |
579 | void edac_mc_handle_ce(struct mem_ctl_info *mci, | |
079708b9 DT |
580 | unsigned long page_frame_number, |
581 | unsigned long offset_in_page, unsigned long syndrome, | |
582 | int row, int channel, const char *msg) | |
da9bb1d2 AC |
583 | { |
584 | unsigned long remapped_page; | |
585 | ||
537fba28 | 586 | debugf3("MC%d: %s()\n", mci->mc_idx, __func__); |
da9bb1d2 AC |
587 | |
588 | /* FIXME - maybe make panic on INTERNAL ERROR an option */ | |
589 | if (row >= mci->nr_csrows || row < 0) { | |
590 | /* something is wrong */ | |
537fba28 | 591 | edac_mc_printk(mci, KERN_ERR, |
079708b9 DT |
592 | "INTERNAL ERROR: row out of range " |
593 | "(%d >= %d)\n", row, mci->nr_csrows); | |
da9bb1d2 AC |
594 | edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR"); |
595 | return; | |
596 | } | |
e7ecd891 | 597 | |
da9bb1d2 AC |
598 | if (channel >= mci->csrows[row].nr_channels || channel < 0) { |
599 | /* something is wrong */ | |
537fba28 | 600 | edac_mc_printk(mci, KERN_ERR, |
079708b9 DT |
601 | "INTERNAL ERROR: channel out of range " |
602 | "(%d >= %d)\n", channel, | |
603 | mci->csrows[row].nr_channels); | |
da9bb1d2 AC |
604 | edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR"); |
605 | return; | |
606 | } | |
607 | ||
4de78c68 | 608 | if (edac_mc_get_log_ce()) |
da9bb1d2 | 609 | /* FIXME - put in DIMM location */ |
537fba28 | 610 | edac_mc_printk(mci, KERN_WARNING, |
079708b9 DT |
611 | "CE page 0x%lx, offset 0x%lx, grain %d, syndrome " |
612 | "0x%lx, row %d, channel %d, label \"%s\": %s\n", | |
613 | page_frame_number, offset_in_page, | |
614 | mci->csrows[row].grain, syndrome, row, channel, | |
615 | mci->csrows[row].channels[channel].label, msg); | |
da9bb1d2 AC |
616 | |
617 | mci->ce_count++; | |
618 | mci->csrows[row].ce_count++; | |
619 | mci->csrows[row].channels[channel].ce_count++; | |
620 | ||
621 | if (mci->scrub_mode & SCRUB_SW_SRC) { | |
622 | /* | |
623 | * Some MC's can remap memory so that it is still available | |
624 | * at a different address when PCI devices map into memory. | |
625 | * MC's that can't do this lose the memory where PCI devices | |
626 | * are mapped. This mapping is MC dependant and so we call | |
627 | * back into the MC driver for it to map the MC page to | |
628 | * a physical (CPU) page which can then be mapped to a virtual | |
629 | * page - which can then be scrubbed. | |
630 | */ | |
631 | remapped_page = mci->ctl_page_to_phys ? | |
632 | mci->ctl_page_to_phys(mci, page_frame_number) : | |
633 | page_frame_number; | |
634 | ||
635 | edac_mc_scrub_block(remapped_page, offset_in_page, | |
079708b9 | 636 | mci->csrows[row].grain); |
da9bb1d2 AC |
637 | } |
638 | } | |
079708b9 | 639 | |
9110540f | 640 | EXPORT_SYMBOL_GPL(edac_mc_handle_ce); |
da9bb1d2 | 641 | |
e7ecd891 | 642 | void edac_mc_handle_ce_no_info(struct mem_ctl_info *mci, const char *msg) |
da9bb1d2 | 643 | { |
4de78c68 | 644 | if (edac_mc_get_log_ce()) |
537fba28 | 645 | edac_mc_printk(mci, KERN_WARNING, |
079708b9 | 646 | "CE - no information available: %s\n", msg); |
e7ecd891 | 647 | |
da9bb1d2 AC |
648 | mci->ce_noinfo_count++; |
649 | mci->ce_count++; | |
650 | } | |
079708b9 | 651 | |
9110540f | 652 | EXPORT_SYMBOL_GPL(edac_mc_handle_ce_no_info); |
da9bb1d2 | 653 | |
da9bb1d2 | 654 | void edac_mc_handle_ue(struct mem_ctl_info *mci, |
079708b9 DT |
655 | unsigned long page_frame_number, |
656 | unsigned long offset_in_page, int row, const char *msg) | |
da9bb1d2 AC |
657 | { |
658 | int len = EDAC_MC_LABEL_LEN * 4; | |
659 | char labels[len + 1]; | |
660 | char *pos = labels; | |
661 | int chan; | |
662 | int chars; | |
663 | ||
537fba28 | 664 | debugf3("MC%d: %s()\n", mci->mc_idx, __func__); |
da9bb1d2 AC |
665 | |
666 | /* FIXME - maybe make panic on INTERNAL ERROR an option */ | |
667 | if (row >= mci->nr_csrows || row < 0) { | |
668 | /* something is wrong */ | |
537fba28 | 669 | edac_mc_printk(mci, KERN_ERR, |
079708b9 DT |
670 | "INTERNAL ERROR: row out of range " |
671 | "(%d >= %d)\n", row, mci->nr_csrows); | |
da9bb1d2 AC |
672 | edac_mc_handle_ue_no_info(mci, "INTERNAL ERROR"); |
673 | return; | |
674 | } | |
675 | ||
676 | chars = snprintf(pos, len + 1, "%s", | |
079708b9 | 677 | mci->csrows[row].channels[0].label); |
da9bb1d2 AC |
678 | len -= chars; |
679 | pos += chars; | |
e7ecd891 | 680 | |
da9bb1d2 AC |
681 | for (chan = 1; (chan < mci->csrows[row].nr_channels) && (len > 0); |
682 | chan++) { | |
683 | chars = snprintf(pos, len + 1, ":%s", | |
079708b9 | 684 | mci->csrows[row].channels[chan].label); |
da9bb1d2 AC |
685 | len -= chars; |
686 | pos += chars; | |
687 | } | |
688 | ||
4de78c68 | 689 | if (edac_mc_get_log_ue()) |
537fba28 | 690 | edac_mc_printk(mci, KERN_EMERG, |
079708b9 DT |
691 | "UE page 0x%lx, offset 0x%lx, grain %d, row %d, " |
692 | "labels \"%s\": %s\n", page_frame_number, | |
693 | offset_in_page, mci->csrows[row].grain, row, | |
694 | labels, msg); | |
da9bb1d2 | 695 | |
4de78c68 | 696 | if (edac_mc_get_panic_on_ue()) |
e7ecd891 | 697 | panic("EDAC MC%d: UE page 0x%lx, offset 0x%lx, grain %d, " |
079708b9 DT |
698 | "row %d, labels \"%s\": %s\n", mci->mc_idx, |
699 | page_frame_number, offset_in_page, | |
700 | mci->csrows[row].grain, row, labels, msg); | |
da9bb1d2 AC |
701 | |
702 | mci->ue_count++; | |
703 | mci->csrows[row].ue_count++; | |
704 | } | |
079708b9 | 705 | |
9110540f | 706 | EXPORT_SYMBOL_GPL(edac_mc_handle_ue); |
da9bb1d2 | 707 | |
e7ecd891 | 708 | void edac_mc_handle_ue_no_info(struct mem_ctl_info *mci, const char *msg) |
da9bb1d2 | 709 | { |
4de78c68 | 710 | if (edac_mc_get_panic_on_ue()) |
da9bb1d2 AC |
711 | panic("EDAC MC%d: Uncorrected Error", mci->mc_idx); |
712 | ||
4de78c68 | 713 | if (edac_mc_get_log_ue()) |
537fba28 | 714 | edac_mc_printk(mci, KERN_WARNING, |
079708b9 | 715 | "UE - no information available: %s\n", msg); |
da9bb1d2 AC |
716 | mci->ue_noinfo_count++; |
717 | mci->ue_count++; | |
718 | } | |
719 | ||
079708b9 | 720 | EXPORT_SYMBOL_GPL(edac_mc_handle_ue_no_info); |
da9bb1d2 | 721 | |
9794f33d | 722 | /************************************************************* |
723 | * On Fully Buffered DIMM modules, this help function is | |
724 | * called to process UE events | |
725 | */ | |
726 | void edac_mc_handle_fbd_ue(struct mem_ctl_info *mci, | |
079708b9 DT |
727 | unsigned int csrow, |
728 | unsigned int channela, | |
729 | unsigned int channelb, char *msg) | |
9794f33d | 730 | { |
731 | int len = EDAC_MC_LABEL_LEN * 4; | |
732 | char labels[len + 1]; | |
733 | char *pos = labels; | |
734 | int chars; | |
735 | ||
736 | if (csrow >= mci->nr_csrows) { | |
737 | /* something is wrong */ | |
738 | edac_mc_printk(mci, KERN_ERR, | |
079708b9 DT |
739 | "INTERNAL ERROR: row out of range (%d >= %d)\n", |
740 | csrow, mci->nr_csrows); | |
9794f33d | 741 | edac_mc_handle_ue_no_info(mci, "INTERNAL ERROR"); |
742 | return; | |
743 | } | |
744 | ||
745 | if (channela >= mci->csrows[csrow].nr_channels) { | |
746 | /* something is wrong */ | |
747 | edac_mc_printk(mci, KERN_ERR, | |
079708b9 DT |
748 | "INTERNAL ERROR: channel-a out of range " |
749 | "(%d >= %d)\n", | |
750 | channela, mci->csrows[csrow].nr_channels); | |
9794f33d | 751 | edac_mc_handle_ue_no_info(mci, "INTERNAL ERROR"); |
752 | return; | |
753 | } | |
754 | ||
755 | if (channelb >= mci->csrows[csrow].nr_channels) { | |
756 | /* something is wrong */ | |
757 | edac_mc_printk(mci, KERN_ERR, | |
079708b9 DT |
758 | "INTERNAL ERROR: channel-b out of range " |
759 | "(%d >= %d)\n", | |
760 | channelb, mci->csrows[csrow].nr_channels); | |
9794f33d | 761 | edac_mc_handle_ue_no_info(mci, "INTERNAL ERROR"); |
762 | return; | |
763 | } | |
764 | ||
765 | mci->ue_count++; | |
766 | mci->csrows[csrow].ue_count++; | |
767 | ||
768 | /* Generate the DIMM labels from the specified channels */ | |
769 | chars = snprintf(pos, len + 1, "%s", | |
770 | mci->csrows[csrow].channels[channela].label); | |
079708b9 DT |
771 | len -= chars; |
772 | pos += chars; | |
9794f33d | 773 | chars = snprintf(pos, len + 1, "-%s", |
774 | mci->csrows[csrow].channels[channelb].label); | |
775 | ||
4de78c68 | 776 | if (edac_mc_get_log_ue()) |
9794f33d | 777 | edac_mc_printk(mci, KERN_EMERG, |
079708b9 DT |
778 | "UE row %d, channel-a= %d channel-b= %d " |
779 | "labels \"%s\": %s\n", csrow, channela, channelb, | |
780 | labels, msg); | |
9794f33d | 781 | |
4de78c68 | 782 | if (edac_mc_get_panic_on_ue()) |
9794f33d | 783 | panic("UE row %d, channel-a= %d channel-b= %d " |
079708b9 DT |
784 | "labels \"%s\": %s\n", csrow, channela, |
785 | channelb, labels, msg); | |
9794f33d | 786 | } |
079708b9 | 787 | |
9794f33d | 788 | EXPORT_SYMBOL(edac_mc_handle_fbd_ue); |
789 | ||
790 | /************************************************************* | |
791 | * On Fully Buffered DIMM modules, this help function is | |
792 | * called to process CE events | |
793 | */ | |
794 | void edac_mc_handle_fbd_ce(struct mem_ctl_info *mci, | |
079708b9 | 795 | unsigned int csrow, unsigned int channel, char *msg) |
9794f33d | 796 | { |
797 | ||
798 | /* Ensure boundary values */ | |
799 | if (csrow >= mci->nr_csrows) { | |
800 | /* something is wrong */ | |
801 | edac_mc_printk(mci, KERN_ERR, | |
079708b9 DT |
802 | "INTERNAL ERROR: row out of range (%d >= %d)\n", |
803 | csrow, mci->nr_csrows); | |
9794f33d | 804 | edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR"); |
805 | return; | |
806 | } | |
807 | if (channel >= mci->csrows[csrow].nr_channels) { | |
808 | /* something is wrong */ | |
809 | edac_mc_printk(mci, KERN_ERR, | |
079708b9 DT |
810 | "INTERNAL ERROR: channel out of range (%d >= %d)\n", |
811 | channel, mci->csrows[csrow].nr_channels); | |
9794f33d | 812 | edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR"); |
813 | return; | |
814 | } | |
815 | ||
4de78c68 | 816 | if (edac_mc_get_log_ce()) |
9794f33d | 817 | /* FIXME - put in DIMM location */ |
818 | edac_mc_printk(mci, KERN_WARNING, | |
079708b9 DT |
819 | "CE row %d, channel %d, label \"%s\": %s\n", |
820 | csrow, channel, | |
821 | mci->csrows[csrow].channels[channel].label, msg); | |
9794f33d | 822 | |
823 | mci->ce_count++; | |
824 | mci->csrows[csrow].ce_count++; | |
825 | mci->csrows[csrow].channels[channel].ce_count++; | |
826 | } | |
9794f33d | 827 | |
079708b9 | 828 | EXPORT_SYMBOL(edac_mc_handle_fbd_ce); |
9794f33d | 829 | |
da9bb1d2 AC |
830 | /* |
831 | * Iterate over all MC instances and check for ECC, et al, errors | |
832 | */ | |
7c9281d7 | 833 | void edac_check_mc_devices(void) |
da9bb1d2 | 834 | { |
da9bb1d2 AC |
835 | struct list_head *item; |
836 | struct mem_ctl_info *mci; | |
837 | ||
537fba28 | 838 | debugf3("%s()\n", __func__); |
63b7df91 | 839 | mutex_lock(&mem_ctls_mutex); |
da9bb1d2 AC |
840 | |
841 | list_for_each(item, &mc_devices) { | |
842 | mci = list_entry(item, struct mem_ctl_info, link); | |
843 | ||
844 | if (mci->edac_check != NULL) | |
845 | mci->edac_check(mci); | |
846 | } | |
847 | ||
63b7df91 | 848 | mutex_unlock(&mem_ctls_mutex); |
da9bb1d2 | 849 | } |