Commit | Line | Data |
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91b99041 DJ |
1 | /* |
2 | * EDAC PCI component | |
3 | * | |
4 | * Author: Dave Jiang <djiang@mvista.com> | |
5 | * | |
6 | * 2007 (c) MontaVista Software, Inc. This file is licensed under | |
7 | * the terms of the GNU General Public License version 2. This program | |
8 | * is licensed "as is" without any warranty of any kind, whether express | |
9 | * or implied. | |
10 | * | |
11 | */ | |
12 | #include <linux/module.h> | |
13 | #include <linux/types.h> | |
14 | #include <linux/smp.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/sysctl.h> | |
17 | #include <linux/highmem.h> | |
18 | #include <linux/timer.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/spinlock.h> | |
21 | #include <linux/list.h> | |
22 | #include <linux/sysdev.h> | |
23 | #include <linux/ctype.h> | |
24 | #include <linux/workqueue.h> | |
25 | #include <asm/uaccess.h> | |
26 | #include <asm/page.h> | |
27 | ||
28 | #include "edac_core.h" | |
29 | #include "edac_module.h" | |
30 | ||
31 | static DEFINE_MUTEX(edac_pci_ctls_mutex); | |
32 | static struct list_head edac_pci_list = LIST_HEAD_INIT(edac_pci_list); | |
33 | ||
34 | static inline void edac_lock_pci_list(void) | |
35 | { | |
36 | mutex_lock(&edac_pci_ctls_mutex); | |
37 | } | |
38 | ||
39 | static inline void edac_unlock_pci_list(void) | |
40 | { | |
41 | mutex_unlock(&edac_pci_ctls_mutex); | |
42 | } | |
43 | ||
44 | /* | |
45 | * The alloc() and free() functions for the 'edac_pci' control info | |
46 | * structure. The chip driver will allocate one of these for each | |
47 | * edac_pci it is going to control/register with the EDAC CORE. | |
48 | */ | |
079708b9 DT |
49 | struct edac_pci_ctl_info *edac_pci_alloc_ctl_info(unsigned int sz_pvt, |
50 | const char *edac_pci_name) | |
91b99041 DJ |
51 | { |
52 | struct edac_pci_ctl_info *pci; | |
53 | void *pvt; | |
54 | unsigned int size; | |
55 | ||
56 | pci = (struct edac_pci_ctl_info *)0; | |
57 | pvt = edac_align_ptr(&pci[1], sz_pvt); | |
58 | size = ((unsigned long)pvt) + sz_pvt; | |
59 | ||
60 | if ((pci = kzalloc(size, GFP_KERNEL)) == NULL) | |
61 | return NULL; | |
62 | ||
63 | pvt = sz_pvt ? ((char *)pci) + ((unsigned long)pvt) : NULL; | |
64 | ||
65 | pci->pvt_info = pvt; | |
66 | ||
67 | pci->op_state = OP_ALLOC; | |
68 | ||
079708b9 | 69 | snprintf(pci->name, strlen(edac_pci_name) + 1, "%s", edac_pci_name); |
91b99041 DJ |
70 | |
71 | return pci; | |
72 | } | |
079708b9 | 73 | |
91b99041 DJ |
74 | EXPORT_SYMBOL_GPL(edac_pci_alloc_ctl_info); |
75 | ||
76 | /* | |
77 | * edac_pci_free_ctl_info() | |
78 | * frees the memory allocated by edac_pci_alloc_ctl_info() function | |
79 | */ | |
80 | void edac_pci_free_ctl_info(struct edac_pci_ctl_info *pci) | |
81 | { | |
82 | kfree(pci); | |
83 | } | |
079708b9 | 84 | |
91b99041 DJ |
85 | EXPORT_SYMBOL_GPL(edac_pci_free_ctl_info); |
86 | ||
87 | /* | |
88 | * find_edac_pci_by_dev() | |
89 | * scans the edac_pci list for a specific 'struct device *' | |
90 | */ | |
079708b9 | 91 | static struct edac_pci_ctl_info *find_edac_pci_by_dev(struct device *dev) |
91b99041 DJ |
92 | { |
93 | struct edac_pci_ctl_info *pci; | |
94 | struct list_head *item; | |
95 | ||
96 | debugf3("%s()\n", __func__); | |
97 | ||
98 | list_for_each(item, &edac_pci_list) { | |
99 | pci = list_entry(item, struct edac_pci_ctl_info, link); | |
100 | ||
101 | if (pci->dev == dev) | |
102 | return pci; | |
103 | } | |
104 | ||
105 | return NULL; | |
106 | } | |
107 | ||
108 | /* | |
109 | * add_edac_pci_to_global_list | |
110 | * Before calling this function, caller must assign a unique value to | |
111 | * edac_dev->pci_idx. | |
112 | * Return: | |
113 | * 0 on success | |
114 | * 1 on failure | |
115 | */ | |
116 | static int add_edac_pci_to_global_list(struct edac_pci_ctl_info *pci) | |
117 | { | |
118 | struct list_head *item, *insert_before; | |
119 | struct edac_pci_ctl_info *rover; | |
120 | ||
121 | insert_before = &edac_pci_list; | |
122 | ||
123 | /* Determine if already on the list */ | |
124 | if (unlikely((rover = find_edac_pci_by_dev(pci->dev)) != NULL)) | |
125 | goto fail0; | |
126 | ||
127 | /* Insert in ascending order by 'pci_idx', so find position */ | |
128 | list_for_each(item, &edac_pci_list) { | |
129 | rover = list_entry(item, struct edac_pci_ctl_info, link); | |
130 | ||
131 | if (rover->pci_idx >= pci->pci_idx) { | |
132 | if (unlikely(rover->pci_idx == pci->pci_idx)) | |
133 | goto fail1; | |
134 | ||
135 | insert_before = item; | |
136 | break; | |
137 | } | |
138 | } | |
139 | ||
140 | list_add_tail_rcu(&pci->link, insert_before); | |
141 | return 0; | |
142 | ||
079708b9 | 143 | fail0: |
91b99041 | 144 | edac_printk(KERN_WARNING, EDAC_PCI, |
079708b9 DT |
145 | "%s (%s) %s %s already assigned %d\n", |
146 | rover->dev->bus_id, dev_name(rover), | |
147 | rover->mod_name, rover->ctl_name, rover->pci_idx); | |
91b99041 DJ |
148 | return 1; |
149 | ||
079708b9 | 150 | fail1: |
91b99041 | 151 | edac_printk(KERN_WARNING, EDAC_PCI, |
079708b9 DT |
152 | "but in low-level driver: attempt to assign\n" |
153 | "\tduplicate pci_idx %d in %s()\n", rover->pci_idx, | |
154 | __func__); | |
91b99041 DJ |
155 | return 1; |
156 | } | |
157 | ||
158 | /* | |
159 | * complete_edac_pci_list_del | |
160 | */ | |
161 | static void complete_edac_pci_list_del(struct rcu_head *head) | |
162 | { | |
163 | struct edac_pci_ctl_info *pci; | |
164 | ||
165 | pci = container_of(head, struct edac_pci_ctl_info, rcu); | |
166 | INIT_LIST_HEAD(&pci->link); | |
167 | complete(&pci->complete); | |
168 | } | |
169 | ||
170 | /* | |
171 | * del_edac_pci_from_global_list | |
172 | */ | |
173 | static void del_edac_pci_from_global_list(struct edac_pci_ctl_info *pci) | |
174 | { | |
175 | list_del_rcu(&pci->link); | |
176 | init_completion(&pci->complete); | |
177 | call_rcu(&pci->rcu, complete_edac_pci_list_del); | |
178 | wait_for_completion(&pci->complete); | |
179 | } | |
180 | ||
181 | /* | |
182 | * edac_pci_find() | |
183 | * Search for an edac_pci_ctl_info structure whose index is 'idx' | |
184 | * | |
185 | * If found, return a pointer to the structure | |
186 | * Else return NULL. | |
187 | * | |
188 | * Caller must hold pci_ctls_mutex. | |
189 | */ | |
079708b9 | 190 | struct edac_pci_ctl_info *edac_pci_find(int idx) |
91b99041 DJ |
191 | { |
192 | struct list_head *item; | |
193 | struct edac_pci_ctl_info *pci; | |
194 | ||
195 | /* Iterage over list, looking for exact match of ID */ | |
196 | list_for_each(item, &edac_pci_list) { | |
197 | pci = list_entry(item, struct edac_pci_ctl_info, link); | |
198 | ||
199 | if (pci->pci_idx >= idx) { | |
200 | if (pci->pci_idx == idx) | |
201 | return pci; | |
202 | ||
079708b9 | 203 | /* not on list, so terminate early */ |
91b99041 DJ |
204 | break; |
205 | } | |
206 | } | |
207 | ||
208 | return NULL; | |
209 | } | |
079708b9 | 210 | |
91b99041 DJ |
211 | EXPORT_SYMBOL_GPL(edac_pci_find); |
212 | ||
213 | /* | |
214 | * edac_pci_workq_function() | |
215 | * performs the operation scheduled by a workq request | |
216 | */ | |
91b99041 DJ |
217 | static void edac_pci_workq_function(struct work_struct *work_req) |
218 | { | |
219 | struct delayed_work *d_work = (struct delayed_work *)work_req; | |
220 | struct edac_pci_ctl_info *pci = to_edac_pci_ctl_work(d_work); | |
91b99041 DJ |
221 | |
222 | edac_lock_pci_list(); | |
223 | ||
224 | if ((pci->op_state == OP_RUNNING_POLL) && | |
079708b9 | 225 | (pci->edac_check != NULL) && (edac_pci_get_check_errors())) |
91b99041 DJ |
226 | pci->edac_check(pci); |
227 | ||
228 | edac_unlock_pci_list(); | |
229 | ||
230 | /* Reschedule */ | |
4de78c68 | 231 | queue_delayed_work(edac_workqueue, &pci->work, |
079708b9 | 232 | msecs_to_jiffies(edac_pci_get_poll_msec())); |
91b99041 DJ |
233 | } |
234 | ||
235 | /* | |
236 | * edac_pci_workq_setup() | |
237 | * initialize a workq item for this edac_pci instance | |
238 | * passing in the new delay period in msec | |
239 | */ | |
240 | static void edac_pci_workq_setup(struct edac_pci_ctl_info *pci, | |
079708b9 | 241 | unsigned int msec) |
91b99041 DJ |
242 | { |
243 | debugf0("%s()\n", __func__); | |
244 | ||
91b99041 | 245 | INIT_DELAYED_WORK(&pci->work, edac_pci_workq_function); |
4de78c68 | 246 | queue_delayed_work(edac_workqueue, &pci->work, |
079708b9 | 247 | msecs_to_jiffies(edac_pci_get_poll_msec())); |
91b99041 DJ |
248 | } |
249 | ||
250 | /* | |
251 | * edac_pci_workq_teardown() | |
252 | * stop the workq processing on this edac_pci instance | |
253 | */ | |
254 | static void edac_pci_workq_teardown(struct edac_pci_ctl_info *pci) | |
255 | { | |
256 | int status; | |
257 | ||
258 | status = cancel_delayed_work(&pci->work); | |
259 | if (status == 0) | |
260 | flush_workqueue(edac_workqueue); | |
261 | } | |
262 | ||
263 | /* | |
264 | * edac_pci_reset_delay_period | |
265 | */ | |
266 | void edac_pci_reset_delay_period(struct edac_pci_ctl_info *pci, | |
079708b9 | 267 | unsigned long value) |
91b99041 DJ |
268 | { |
269 | edac_lock_pci_list(); | |
270 | ||
271 | edac_pci_workq_teardown(pci); | |
272 | ||
273 | edac_pci_workq_setup(pci, value); | |
274 | ||
275 | edac_unlock_pci_list(); | |
276 | } | |
079708b9 | 277 | |
91b99041 DJ |
278 | EXPORT_SYMBOL_GPL(edac_pci_reset_delay_period); |
279 | ||
280 | /* | |
281 | * edac_pci_add_device: Insert the 'edac_dev' structure into the | |
282 | * edac_pci global list and create sysfs entries associated with | |
283 | * edac_pci structure. | |
284 | * @pci: pointer to the edac_device structure to be added to the list | |
285 | * @edac_idx: A unique numeric identifier to be assigned to the | |
286 | * 'edac_pci' structure. | |
287 | * | |
288 | * Return: | |
289 | * 0 Success | |
290 | * !0 Failure | |
291 | */ | |
292 | int edac_pci_add_device(struct edac_pci_ctl_info *pci, int edac_idx) | |
293 | { | |
294 | debugf0("%s()\n", __func__); | |
295 | ||
296 | pci->pci_idx = edac_idx; | |
297 | ||
298 | edac_lock_pci_list(); | |
299 | ||
300 | if (add_edac_pci_to_global_list(pci)) | |
301 | goto fail0; | |
302 | ||
303 | pci->start_time = jiffies; | |
304 | ||
305 | if (edac_pci_create_sysfs(pci)) { | |
306 | edac_pci_printk(pci, KERN_WARNING, | |
307 | "failed to create sysfs pci\n"); | |
308 | goto fail1; | |
309 | } | |
310 | ||
311 | if (pci->edac_check != NULL) { | |
312 | pci->op_state = OP_RUNNING_POLL; | |
313 | ||
314 | edac_pci_workq_setup(pci, 1000); | |
315 | } else { | |
316 | pci->op_state = OP_RUNNING_INTERRUPT; | |
317 | } | |
318 | ||
319 | edac_pci_printk(pci, KERN_INFO, | |
079708b9 DT |
320 | "Giving out device to module '%s' controller '%s':" |
321 | " DEV '%s' (%s)\n", | |
322 | pci->mod_name, | |
323 | pci->ctl_name, | |
324 | dev_name(pci), edac_op_state_toString(pci->op_state)); | |
91b99041 DJ |
325 | |
326 | edac_unlock_pci_list(); | |
327 | return 0; | |
328 | ||
079708b9 | 329 | fail1: |
91b99041 | 330 | del_edac_pci_from_global_list(pci); |
079708b9 | 331 | fail0: |
91b99041 DJ |
332 | edac_unlock_pci_list(); |
333 | return 1; | |
334 | } | |
079708b9 | 335 | |
91b99041 DJ |
336 | EXPORT_SYMBOL_GPL(edac_pci_add_device); |
337 | ||
338 | /* | |
339 | * edac_pci_del_device() | |
340 | * Remove sysfs entries for specified edac_pci structure and | |
341 | * then remove edac_pci structure from global list | |
342 | * | |
343 | * @dev: | |
344 | * Pointer to 'struct device' representing edac_pci structure | |
345 | * to remove | |
346 | * | |
347 | * Return: | |
348 | * Pointer to removed edac_pci structure, | |
349 | * or NULL if device not found | |
350 | */ | |
079708b9 | 351 | struct edac_pci_ctl_info *edac_pci_del_device(struct device *dev) |
91b99041 DJ |
352 | { |
353 | struct edac_pci_ctl_info *pci; | |
354 | ||
355 | debugf0("%s()\n", __func__); | |
356 | ||
357 | edac_lock_pci_list(); | |
358 | ||
359 | if ((pci = find_edac_pci_by_dev(dev)) == NULL) { | |
360 | edac_unlock_pci_list(); | |
361 | return NULL; | |
362 | } | |
363 | ||
364 | pci->op_state = OP_OFFLINE; | |
365 | ||
366 | edac_pci_workq_teardown(pci); | |
367 | ||
368 | edac_pci_remove_sysfs(pci); | |
369 | ||
370 | del_edac_pci_from_global_list(pci); | |
371 | ||
372 | edac_unlock_pci_list(); | |
373 | ||
374 | edac_printk(KERN_INFO, EDAC_PCI, | |
079708b9 DT |
375 | "Removed device %d for %s %s: DEV %s\n", |
376 | pci->pci_idx, pci->mod_name, pci->ctl_name, dev_name(pci)); | |
91b99041 DJ |
377 | |
378 | return pci; | |
379 | } | |
079708b9 | 380 | |
91b99041 DJ |
381 | EXPORT_SYMBOL_GPL(edac_pci_del_device); |
382 | ||
91b99041 DJ |
383 | void edac_pci_generic_check(struct edac_pci_ctl_info *pci) |
384 | { | |
385 | edac_pci_do_parity_check(); | |
386 | } | |
387 | ||
388 | static int edac_pci_idx = 0; | |
389 | #define EDAC_PCI_GENCTL_NAME "EDAC PCI controller" | |
390 | ||
391 | struct edac_pci_gen_data { | |
392 | int edac_idx; | |
393 | }; | |
394 | ||
079708b9 DT |
395 | struct edac_pci_ctl_info *edac_pci_create_generic_ctl(struct device *dev, |
396 | const char *mod_name) | |
91b99041 DJ |
397 | { |
398 | struct edac_pci_ctl_info *pci; | |
399 | struct edac_pci_gen_data *pdata; | |
400 | ||
401 | pci = edac_pci_alloc_ctl_info(sizeof(*pdata), EDAC_PCI_GENCTL_NAME); | |
402 | if (!pci) | |
403 | return NULL; | |
404 | ||
405 | pdata = pci->pvt_info; | |
406 | pci->dev = dev; | |
407 | dev_set_drvdata(pci->dev, pci); | |
408 | pci->dev_name = pci_name(to_pci_dev(dev)); | |
409 | ||
410 | pci->mod_name = mod_name; | |
411 | pci->ctl_name = EDAC_PCI_GENCTL_NAME; | |
412 | pci->edac_check = edac_pci_generic_check; | |
413 | ||
414 | pdata->edac_idx = edac_pci_idx++; | |
415 | ||
416 | if (edac_pci_add_device(pci, pdata->edac_idx) > 0) { | |
417 | debugf3("%s(): failed edac_pci_add_device()\n", __func__); | |
418 | edac_pci_free_ctl_info(pci); | |
419 | return NULL; | |
420 | } | |
421 | ||
422 | return pci; | |
423 | } | |
079708b9 | 424 | |
91b99041 DJ |
425 | EXPORT_SYMBOL_GPL(edac_pci_create_generic_ctl); |
426 | ||
427 | void edac_pci_release_generic_ctl(struct edac_pci_ctl_info *pci) | |
428 | { | |
429 | edac_pci_del_device(pci->dev); | |
430 | edac_pci_free_ctl_info(pci); | |
431 | } | |
079708b9 | 432 | |
91b99041 | 433 | EXPORT_SYMBOL_GPL(edac_pci_release_generic_ctl); |