Commit | Line | Data |
---|---|---|
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 | */ | |
0b892c71 MCC |
12 | #include <asm/page.h> |
13 | #include <asm/uaccess.h> | |
14 | #include <linux/ctype.h> | |
15 | #include <linux/highmem.h> | |
16 | #include <linux/init.h> | |
91b99041 | 17 | #include <linux/module.h> |
0b892c71 | 18 | #include <linux/slab.h> |
91b99041 | 19 | #include <linux/smp.h> |
0b892c71 | 20 | #include <linux/spinlock.h> |
91b99041 | 21 | #include <linux/sysctl.h> |
91b99041 | 22 | #include <linux/timer.h> |
91b99041 | 23 | |
0b892c71 | 24 | #include "edac_pci.h" |
91b99041 DJ |
25 | #include "edac_module.h" |
26 | ||
27 | static DEFINE_MUTEX(edac_pci_ctls_mutex); | |
ff6ac2a6 | 28 | static LIST_HEAD(edac_pci_list); |
8641a384 | 29 | static atomic_t pci_indexes = ATOMIC_INIT(0); |
91b99041 | 30 | |
079708b9 | 31 | struct edac_pci_ctl_info *edac_pci_alloc_ctl_info(unsigned int sz_pvt, |
052dfb45 | 32 | const char *edac_pci_name) |
91b99041 DJ |
33 | { |
34 | struct edac_pci_ctl_info *pci; | |
93e4fe64 | 35 | void *p = NULL, *pvt; |
91b99041 DJ |
36 | unsigned int size; |
37 | ||
956b9ba1 | 38 | edac_dbg(1, "\n"); |
d4c1465b | 39 | |
93e4fe64 MCC |
40 | pci = edac_align_ptr(&p, sizeof(*pci), 1); |
41 | pvt = edac_align_ptr(&p, 1, sz_pvt); | |
91b99041 DJ |
42 | size = ((unsigned long)pvt) + sz_pvt; |
43 | ||
d4c1465b DT |
44 | /* Alloc the needed control struct memory */ |
45 | pci = kzalloc(size, GFP_KERNEL); | |
46 | if (pci == NULL) | |
91b99041 DJ |
47 | return NULL; |
48 | ||
d4c1465b | 49 | /* Now much private space */ |
91b99041 DJ |
50 | pvt = sz_pvt ? ((char *)pci) + ((unsigned long)pvt) : NULL; |
51 | ||
52 | pci->pvt_info = pvt; | |
91b99041 DJ |
53 | pci->op_state = OP_ALLOC; |
54 | ||
079708b9 | 55 | snprintf(pci->name, strlen(edac_pci_name) + 1, "%s", edac_pci_name); |
91b99041 DJ |
56 | |
57 | return pci; | |
58 | } | |
59 | EXPORT_SYMBOL_GPL(edac_pci_alloc_ctl_info); | |
60 | ||
91b99041 DJ |
61 | void edac_pci_free_ctl_info(struct edac_pci_ctl_info *pci) |
62 | { | |
956b9ba1 | 63 | edac_dbg(1, "\n"); |
079708b9 | 64 | |
d4c1465b DT |
65 | edac_pci_remove_sysfs(pci); |
66 | } | |
91b99041 DJ |
67 | EXPORT_SYMBOL_GPL(edac_pci_free_ctl_info); |
68 | ||
69 | /* | |
70 | * find_edac_pci_by_dev() | |
71 | * scans the edac_pci list for a specific 'struct device *' | |
d4c1465b DT |
72 | * |
73 | * return NULL if not found, or return control struct pointer | |
91b99041 | 74 | */ |
079708b9 | 75 | static struct edac_pci_ctl_info *find_edac_pci_by_dev(struct device *dev) |
91b99041 DJ |
76 | { |
77 | struct edac_pci_ctl_info *pci; | |
78 | struct list_head *item; | |
79 | ||
956b9ba1 | 80 | edac_dbg(1, "\n"); |
91b99041 DJ |
81 | |
82 | list_for_each(item, &edac_pci_list) { | |
83 | pci = list_entry(item, struct edac_pci_ctl_info, link); | |
84 | ||
85 | if (pci->dev == dev) | |
86 | return pci; | |
87 | } | |
88 | ||
89 | return NULL; | |
90 | } | |
91 | ||
92 | /* | |
93 | * add_edac_pci_to_global_list | |
94 | * Before calling this function, caller must assign a unique value to | |
95 | * edac_dev->pci_idx. | |
96 | * Return: | |
97 | * 0 on success | |
98 | * 1 on failure | |
99 | */ | |
100 | static int add_edac_pci_to_global_list(struct edac_pci_ctl_info *pci) | |
101 | { | |
102 | struct list_head *item, *insert_before; | |
103 | struct edac_pci_ctl_info *rover; | |
104 | ||
956b9ba1 | 105 | edac_dbg(1, "\n"); |
d4c1465b | 106 | |
91b99041 DJ |
107 | insert_before = &edac_pci_list; |
108 | ||
109 | /* Determine if already on the list */ | |
d4c1465b DT |
110 | rover = find_edac_pci_by_dev(pci->dev); |
111 | if (unlikely(rover != NULL)) | |
91b99041 DJ |
112 | goto fail0; |
113 | ||
114 | /* Insert in ascending order by 'pci_idx', so find position */ | |
115 | list_for_each(item, &edac_pci_list) { | |
116 | rover = list_entry(item, struct edac_pci_ctl_info, link); | |
117 | ||
118 | if (rover->pci_idx >= pci->pci_idx) { | |
119 | if (unlikely(rover->pci_idx == pci->pci_idx)) | |
120 | goto fail1; | |
121 | ||
122 | insert_before = item; | |
123 | break; | |
124 | } | |
125 | } | |
126 | ||
127 | list_add_tail_rcu(&pci->link, insert_before); | |
128 | return 0; | |
129 | ||
052dfb45 | 130 | fail0: |
91b99041 | 131 | edac_printk(KERN_WARNING, EDAC_PCI, |
052dfb45 | 132 | "%s (%s) %s %s already assigned %d\n", |
281efb17 | 133 | dev_name(rover->dev), edac_dev_name(rover), |
052dfb45 | 134 | rover->mod_name, rover->ctl_name, rover->pci_idx); |
91b99041 DJ |
135 | return 1; |
136 | ||
052dfb45 | 137 | fail1: |
91b99041 | 138 | edac_printk(KERN_WARNING, EDAC_PCI, |
052dfb45 DT |
139 | "but in low-level driver: attempt to assign\n" |
140 | "\tduplicate pci_idx %d in %s()\n", rover->pci_idx, | |
141 | __func__); | |
91b99041 DJ |
142 | return 1; |
143 | } | |
144 | ||
91b99041 DJ |
145 | /* |
146 | * del_edac_pci_from_global_list | |
d4c1465b DT |
147 | * |
148 | * remove the PCI control struct from the global list | |
91b99041 DJ |
149 | */ |
150 | static void del_edac_pci_from_global_list(struct edac_pci_ctl_info *pci) | |
151 | { | |
152 | list_del_rcu(&pci->link); | |
e2e77098 LJ |
153 | |
154 | /* these are for safe removal of devices from global list while | |
155 | * NMI handlers may be traversing list | |
156 | */ | |
157 | synchronize_rcu(); | |
158 | INIT_LIST_HEAD(&pci->link); | |
91b99041 DJ |
159 | } |
160 | ||
91b99041 DJ |
161 | /* |
162 | * edac_pci_workq_function() | |
d4c1465b DT |
163 | * |
164 | * periodic function that performs the operation | |
165 | * scheduled by a workq request, for a given PCI control struct | |
91b99041 | 166 | */ |
91b99041 DJ |
167 | static void edac_pci_workq_function(struct work_struct *work_req) |
168 | { | |
fbeb4384 | 169 | struct delayed_work *d_work = to_delayed_work(work_req); |
91b99041 | 170 | struct edac_pci_ctl_info *pci = to_edac_pci_ctl_work(d_work); |
d4c1465b DT |
171 | int msec; |
172 | unsigned long delay; | |
91b99041 | 173 | |
956b9ba1 | 174 | edac_dbg(3, "checking\n"); |
91b99041 | 175 | |
d4c1465b | 176 | mutex_lock(&edac_pci_ctls_mutex); |
91b99041 | 177 | |
06e912d4 BP |
178 | if (pci->op_state != OP_RUNNING_POLL) { |
179 | mutex_unlock(&edac_pci_ctls_mutex); | |
180 | return; | |
d4c1465b | 181 | } |
91b99041 | 182 | |
06e912d4 BP |
183 | if (edac_pci_get_check_errors()) |
184 | pci->edac_check(pci); | |
185 | ||
186 | /* if we are on a one second period, then use round */ | |
187 | msec = edac_pci_get_poll_msec(); | |
188 | if (msec == 1000) | |
189 | delay = round_jiffies_relative(msecs_to_jiffies(msec)); | |
190 | else | |
191 | delay = msecs_to_jiffies(msec); | |
192 | ||
193 | edac_queue_work(&pci->work, delay); | |
194 | ||
d4c1465b | 195 | mutex_unlock(&edac_pci_ctls_mutex); |
91b99041 DJ |
196 | } |
197 | ||
8641a384 HC |
198 | int edac_pci_alloc_index(void) |
199 | { | |
200 | return atomic_inc_return(&pci_indexes) - 1; | |
201 | } | |
202 | EXPORT_SYMBOL_GPL(edac_pci_alloc_index); | |
203 | ||
91b99041 DJ |
204 | int edac_pci_add_device(struct edac_pci_ctl_info *pci, int edac_idx) |
205 | { | |
956b9ba1 | 206 | edac_dbg(0, "\n"); |
91b99041 DJ |
207 | |
208 | pci->pci_idx = edac_idx; | |
d4c1465b | 209 | pci->start_time = jiffies; |
91b99041 | 210 | |
d4c1465b | 211 | mutex_lock(&edac_pci_ctls_mutex); |
91b99041 DJ |
212 | |
213 | if (add_edac_pci_to_global_list(pci)) | |
214 | goto fail0; | |
215 | ||
91b99041 DJ |
216 | if (edac_pci_create_sysfs(pci)) { |
217 | edac_pci_printk(pci, KERN_WARNING, | |
218 | "failed to create sysfs pci\n"); | |
219 | goto fail1; | |
220 | } | |
221 | ||
09667606 | 222 | if (pci->edac_check) { |
91b99041 DJ |
223 | pci->op_state = OP_RUNNING_POLL; |
224 | ||
626a7a4d BP |
225 | INIT_DELAYED_WORK(&pci->work, edac_pci_workq_function); |
226 | edac_queue_work(&pci->work, msecs_to_jiffies(edac_pci_get_poll_msec())); | |
227 | ||
91b99041 DJ |
228 | } else { |
229 | pci->op_state = OP_RUNNING_INTERRUPT; | |
230 | } | |
231 | ||
232 | edac_pci_printk(pci, KERN_INFO, | |
7270a608 RR |
233 | "Giving out device to module %s controller %s: DEV %s (%s)\n", |
234 | pci->mod_name, pci->ctl_name, pci->dev_name, | |
235 | edac_op_state_to_string(pci->op_state)); | |
91b99041 | 236 | |
d4c1465b | 237 | mutex_unlock(&edac_pci_ctls_mutex); |
91b99041 DJ |
238 | return 0; |
239 | ||
d4c1465b | 240 | /* error unwind stack */ |
052dfb45 | 241 | fail1: |
91b99041 | 242 | del_edac_pci_from_global_list(pci); |
052dfb45 | 243 | fail0: |
d4c1465b | 244 | mutex_unlock(&edac_pci_ctls_mutex); |
91b99041 DJ |
245 | return 1; |
246 | } | |
247 | EXPORT_SYMBOL_GPL(edac_pci_add_device); | |
248 | ||
079708b9 | 249 | struct edac_pci_ctl_info *edac_pci_del_device(struct device *dev) |
91b99041 DJ |
250 | { |
251 | struct edac_pci_ctl_info *pci; | |
252 | ||
956b9ba1 | 253 | edac_dbg(0, "\n"); |
91b99041 | 254 | |
d4c1465b | 255 | mutex_lock(&edac_pci_ctls_mutex); |
91b99041 | 256 | |
d4c1465b DT |
257 | /* ensure the control struct is on the global list |
258 | * if not, then leave | |
259 | */ | |
260 | pci = find_edac_pci_by_dev(dev); | |
261 | if (pci == NULL) { | |
262 | mutex_unlock(&edac_pci_ctls_mutex); | |
91b99041 DJ |
263 | return NULL; |
264 | } | |
265 | ||
266 | pci->op_state = OP_OFFLINE; | |
267 | ||
91b99041 DJ |
268 | del_edac_pci_from_global_list(pci); |
269 | ||
d4c1465b DT |
270 | mutex_unlock(&edac_pci_ctls_mutex); |
271 | ||
09667606 | 272 | if (pci->edac_check) |
626a7a4d | 273 | edac_stop_work(&pci->work); |
91b99041 DJ |
274 | |
275 | edac_printk(KERN_INFO, EDAC_PCI, | |
052dfb45 | 276 | "Removed device %d for %s %s: DEV %s\n", |
17aa7e03 | 277 | pci->pci_idx, pci->mod_name, pci->ctl_name, edac_dev_name(pci)); |
91b99041 DJ |
278 | |
279 | return pci; | |
280 | } | |
281 | EXPORT_SYMBOL_GPL(edac_pci_del_device); | |
282 | ||
d4c1465b DT |
283 | /* |
284 | * edac_pci_generic_check | |
285 | * | |
286 | * a Generic parity check API | |
287 | */ | |
1a45027d | 288 | static void edac_pci_generic_check(struct edac_pci_ctl_info *pci) |
91b99041 | 289 | { |
956b9ba1 | 290 | edac_dbg(4, "\n"); |
91b99041 DJ |
291 | edac_pci_do_parity_check(); |
292 | } | |
293 | ||
d4c1465b | 294 | /* free running instance index counter */ |
f044091c | 295 | static int edac_pci_idx; |
91b99041 DJ |
296 | #define EDAC_PCI_GENCTL_NAME "EDAC PCI controller" |
297 | ||
298 | struct edac_pci_gen_data { | |
299 | int edac_idx; | |
300 | }; | |
301 | ||
079708b9 | 302 | struct edac_pci_ctl_info *edac_pci_create_generic_ctl(struct device *dev, |
052dfb45 | 303 | const char *mod_name) |
91b99041 DJ |
304 | { |
305 | struct edac_pci_ctl_info *pci; | |
306 | struct edac_pci_gen_data *pdata; | |
307 | ||
308 | pci = edac_pci_alloc_ctl_info(sizeof(*pdata), EDAC_PCI_GENCTL_NAME); | |
309 | if (!pci) | |
310 | return NULL; | |
311 | ||
312 | pdata = pci->pvt_info; | |
313 | pci->dev = dev; | |
314 | dev_set_drvdata(pci->dev, pci); | |
315 | pci->dev_name = pci_name(to_pci_dev(dev)); | |
316 | ||
317 | pci->mod_name = mod_name; | |
318 | pci->ctl_name = EDAC_PCI_GENCTL_NAME; | |
876bb331 BP |
319 | if (edac_op_state == EDAC_OPSTATE_POLL) |
320 | pci->edac_check = edac_pci_generic_check; | |
91b99041 DJ |
321 | |
322 | pdata->edac_idx = edac_pci_idx++; | |
323 | ||
324 | if (edac_pci_add_device(pci, pdata->edac_idx) > 0) { | |
956b9ba1 | 325 | edac_dbg(3, "failed edac_pci_add_device()\n"); |
91b99041 DJ |
326 | edac_pci_free_ctl_info(pci); |
327 | return NULL; | |
328 | } | |
329 | ||
330 | return pci; | |
331 | } | |
332 | EXPORT_SYMBOL_GPL(edac_pci_create_generic_ctl); | |
333 | ||
334 | void edac_pci_release_generic_ctl(struct edac_pci_ctl_info *pci) | |
335 | { | |
956b9ba1 | 336 | edac_dbg(0, "pci mod=%s\n", pci->mod_name); |
d4c1465b | 337 | |
91b99041 DJ |
338 | edac_pci_del_device(pci->dev); |
339 | edac_pci_free_ctl_info(pci); | |
340 | } | |
341 | EXPORT_SYMBOL_GPL(edac_pci_release_generic_ctl); |