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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 <asm/page.h>
13#include <linux/uaccess.h>
14#include <linux/ctype.h>
15#include <linux/highmem.h>
16#include <linux/init.h>
17#include <linux/module.h>
18#include <linux/slab.h>
19#include <linux/smp.h>
20#include <linux/spinlock.h>
21#include <linux/sysctl.h>
22#include <linux/timer.h>
23
24#include "edac_pci.h"
25#include "edac_module.h"
26
27static DEFINE_MUTEX(edac_pci_ctls_mutex);
28static LIST_HEAD(edac_pci_list);
29static atomic_t pci_indexes = ATOMIC_INIT(0);
30
31struct edac_pci_ctl_info *edac_pci_alloc_ctl_info(unsigned int sz_pvt,
32 const char *edac_pci_name)
33{
34 struct edac_pci_ctl_info *pci;
35 void *p = NULL, *pvt;
36 unsigned int size;
37
38 edac_dbg(1, "\n");
39
40 pci = edac_align_ptr(&p, sizeof(*pci), 1);
41 pvt = edac_align_ptr(&p, 1, sz_pvt);
42 size = ((unsigned long)pvt) + sz_pvt;
43
44 /* Alloc the needed control struct memory */
45 pci = kzalloc(size, GFP_KERNEL);
46 if (pci == NULL)
47 return NULL;
48
49 /* Now much private space */
50 pvt = sz_pvt ? ((char *)pci) + ((unsigned long)pvt) : NULL;
51
52 pci->pvt_info = pvt;
53 pci->op_state = OP_ALLOC;
54
55 snprintf(pci->name, strlen(edac_pci_name) + 1, "%s", edac_pci_name);
56
57 return pci;
58}
59EXPORT_SYMBOL_GPL(edac_pci_alloc_ctl_info);
60
61void edac_pci_free_ctl_info(struct edac_pci_ctl_info *pci)
62{
63 edac_dbg(1, "\n");
64
65 edac_pci_remove_sysfs(pci);
66}
67EXPORT_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 *'
72 *
73 * return NULL if not found, or return control struct pointer
74 */
75static struct edac_pci_ctl_info *find_edac_pci_by_dev(struct device *dev)
76{
77 struct edac_pci_ctl_info *pci;
78 struct list_head *item;
79
80 edac_dbg(1, "\n");
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 */
100static 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
105 edac_dbg(1, "\n");
106
107 insert_before = &edac_pci_list;
108
109 /* Determine if already on the list */
110 rover = find_edac_pci_by_dev(pci->dev);
111 if (unlikely(rover != NULL))
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
130fail0:
131 edac_printk(KERN_WARNING, EDAC_PCI,
132 "%s (%s) %s %s already assigned %d\n",
133 dev_name(rover->dev), edac_dev_name(rover),
134 rover->mod_name, rover->ctl_name, rover->pci_idx);
135 return 1;
136
137fail1:
138 edac_printk(KERN_WARNING, EDAC_PCI,
139 "but in low-level driver: attempt to assign\n"
140 "\tduplicate pci_idx %d in %s()\n", rover->pci_idx,
141 __func__);
142 return 1;
143}
144
145/*
146 * del_edac_pci_from_global_list
147 *
148 * remove the PCI control struct from the global list
149 */
150static void del_edac_pci_from_global_list(struct edac_pci_ctl_info *pci)
151{
152 list_del_rcu(&pci->link);
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);
159}
160
161/*
162 * edac_pci_workq_function()
163 *
164 * periodic function that performs the operation
165 * scheduled by a workq request, for a given PCI control struct
166 */
167static void edac_pci_workq_function(struct work_struct *work_req)
168{
169 struct delayed_work *d_work = to_delayed_work(work_req);
170 struct edac_pci_ctl_info *pci = to_edac_pci_ctl_work(d_work);
171 int msec;
172 unsigned long delay;
173
174 edac_dbg(3, "checking\n");
175
176 mutex_lock(&edac_pci_ctls_mutex);
177
178 if (pci->op_state != OP_RUNNING_POLL) {
179 mutex_unlock(&edac_pci_ctls_mutex);
180 return;
181 }
182
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
195 mutex_unlock(&edac_pci_ctls_mutex);
196}
197
198int edac_pci_alloc_index(void)
199{
200 return atomic_inc_return(&pci_indexes) - 1;
201}
202EXPORT_SYMBOL_GPL(edac_pci_alloc_index);
203
204int edac_pci_add_device(struct edac_pci_ctl_info *pci, int edac_idx)
205{
206 edac_dbg(0, "\n");
207
208 pci->pci_idx = edac_idx;
209 pci->start_time = jiffies;
210
211 mutex_lock(&edac_pci_ctls_mutex);
212
213 if (add_edac_pci_to_global_list(pci))
214 goto fail0;
215
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
222 if (pci->edac_check) {
223 pci->op_state = OP_RUNNING_POLL;
224
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
228 } else {
229 pci->op_state = OP_RUNNING_INTERRUPT;
230 }
231
232 edac_pci_printk(pci, KERN_INFO,
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));
236
237 mutex_unlock(&edac_pci_ctls_mutex);
238 return 0;
239
240 /* error unwind stack */
241fail1:
242 del_edac_pci_from_global_list(pci);
243fail0:
244 mutex_unlock(&edac_pci_ctls_mutex);
245 return 1;
246}
247EXPORT_SYMBOL_GPL(edac_pci_add_device);
248
249struct edac_pci_ctl_info *edac_pci_del_device(struct device *dev)
250{
251 struct edac_pci_ctl_info *pci;
252
253 edac_dbg(0, "\n");
254
255 mutex_lock(&edac_pci_ctls_mutex);
256
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);
263 return NULL;
264 }
265
266 pci->op_state = OP_OFFLINE;
267
268 del_edac_pci_from_global_list(pci);
269
270 mutex_unlock(&edac_pci_ctls_mutex);
271
272 if (pci->edac_check)
273 edac_stop_work(&pci->work);
274
275 edac_printk(KERN_INFO, EDAC_PCI,
276 "Removed device %d for %s %s: DEV %s\n",
277 pci->pci_idx, pci->mod_name, pci->ctl_name, edac_dev_name(pci));
278
279 return pci;
280}
281EXPORT_SYMBOL_GPL(edac_pci_del_device);
282
283/*
284 * edac_pci_generic_check
285 *
286 * a Generic parity check API
287 */
288static void edac_pci_generic_check(struct edac_pci_ctl_info *pci)
289{
290 edac_dbg(4, "\n");
291 edac_pci_do_parity_check();
292}
293
294/* free running instance index counter */
295static int edac_pci_idx;
296#define EDAC_PCI_GENCTL_NAME "EDAC PCI controller"
297
298struct edac_pci_gen_data {
299 int edac_idx;
300};
301
302struct edac_pci_ctl_info *edac_pci_create_generic_ctl(struct device *dev,
303 const char *mod_name)
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;
319 if (edac_op_state == EDAC_OPSTATE_POLL)
320 pci->edac_check = edac_pci_generic_check;
321
322 pdata->edac_idx = edac_pci_idx++;
323
324 if (edac_pci_add_device(pci, pdata->edac_idx) > 0) {
325 edac_dbg(3, "failed edac_pci_add_device()\n");
326 edac_pci_free_ctl_info(pci);
327 return NULL;
328 }
329
330 return pci;
331}
332EXPORT_SYMBOL_GPL(edac_pci_create_generic_ctl);
333
334void edac_pci_release_generic_ctl(struct edac_pci_ctl_info *pci)
335{
336 edac_dbg(0, "pci mod=%s\n", pci->mod_name);
337
338 edac_pci_del_device(pci->dev);
339 edac_pci_free_ctl_info(pci);
340}
341EXPORT_SYMBOL_GPL(edac_pci_release_generic_ctl);
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 <asm/page.h>
13#include <linux/uaccess.h>
14#include <linux/ctype.h>
15#include <linux/highmem.h>
16#include <linux/init.h>
17#include <linux/module.h>
18#include <linux/slab.h>
19#include <linux/smp.h>
20#include <linux/spinlock.h>
21#include <linux/sysctl.h>
22#include <linux/timer.h>
23
24#include "edac_pci.h"
25#include "edac_module.h"
26
27static DEFINE_MUTEX(edac_pci_ctls_mutex);
28static LIST_HEAD(edac_pci_list);
29static atomic_t pci_indexes = ATOMIC_INIT(0);
30
31struct edac_pci_ctl_info *edac_pci_alloc_ctl_info(unsigned int sz_pvt,
32 const char *edac_pci_name)
33{
34 struct edac_pci_ctl_info *pci;
35 void *p = NULL, *pvt;
36 unsigned int size;
37
38 edac_dbg(1, "\n");
39
40 pci = edac_align_ptr(&p, sizeof(*pci), 1);
41 pvt = edac_align_ptr(&p, 1, sz_pvt);
42 size = ((unsigned long)pvt) + sz_pvt;
43
44 /* Alloc the needed control struct memory */
45 pci = kzalloc(size, GFP_KERNEL);
46 if (pci == NULL)
47 return NULL;
48
49 /* Now much private space */
50 pvt = sz_pvt ? ((char *)pci) + ((unsigned long)pvt) : NULL;
51
52 pci->pvt_info = pvt;
53 pci->op_state = OP_ALLOC;
54
55 snprintf(pci->name, strlen(edac_pci_name) + 1, "%s", edac_pci_name);
56
57 return pci;
58}
59EXPORT_SYMBOL_GPL(edac_pci_alloc_ctl_info);
60
61void edac_pci_free_ctl_info(struct edac_pci_ctl_info *pci)
62{
63 edac_dbg(1, "\n");
64
65 edac_pci_remove_sysfs(pci);
66}
67EXPORT_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 *'
72 *
73 * return NULL if not found, or return control struct pointer
74 */
75static struct edac_pci_ctl_info *find_edac_pci_by_dev(struct device *dev)
76{
77 struct edac_pci_ctl_info *pci;
78 struct list_head *item;
79
80 edac_dbg(1, "\n");
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 */
100static 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
105 edac_dbg(1, "\n");
106
107 insert_before = &edac_pci_list;
108
109 /* Determine if already on the list */
110 rover = find_edac_pci_by_dev(pci->dev);
111 if (unlikely(rover != NULL))
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
130fail0:
131 edac_printk(KERN_WARNING, EDAC_PCI,
132 "%s (%s) %s %s already assigned %d\n",
133 dev_name(rover->dev), edac_dev_name(rover),
134 rover->mod_name, rover->ctl_name, rover->pci_idx);
135 return 1;
136
137fail1:
138 edac_printk(KERN_WARNING, EDAC_PCI,
139 "but in low-level driver: attempt to assign\n"
140 "\tduplicate pci_idx %d in %s()\n", rover->pci_idx,
141 __func__);
142 return 1;
143}
144
145/*
146 * del_edac_pci_from_global_list
147 *
148 * remove the PCI control struct from the global list
149 */
150static void del_edac_pci_from_global_list(struct edac_pci_ctl_info *pci)
151{
152 list_del_rcu(&pci->link);
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);
159}
160
161/*
162 * edac_pci_workq_function()
163 *
164 * periodic function that performs the operation
165 * scheduled by a workq request, for a given PCI control struct
166 */
167static void edac_pci_workq_function(struct work_struct *work_req)
168{
169 struct delayed_work *d_work = to_delayed_work(work_req);
170 struct edac_pci_ctl_info *pci = to_edac_pci_ctl_work(d_work);
171 int msec;
172 unsigned long delay;
173
174 edac_dbg(3, "checking\n");
175
176 mutex_lock(&edac_pci_ctls_mutex);
177
178 if (pci->op_state != OP_RUNNING_POLL) {
179 mutex_unlock(&edac_pci_ctls_mutex);
180 return;
181 }
182
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
195 mutex_unlock(&edac_pci_ctls_mutex);
196}
197
198int edac_pci_alloc_index(void)
199{
200 return atomic_inc_return(&pci_indexes) - 1;
201}
202EXPORT_SYMBOL_GPL(edac_pci_alloc_index);
203
204int edac_pci_add_device(struct edac_pci_ctl_info *pci, int edac_idx)
205{
206 edac_dbg(0, "\n");
207
208 pci->pci_idx = edac_idx;
209 pci->start_time = jiffies;
210
211 mutex_lock(&edac_pci_ctls_mutex);
212
213 if (add_edac_pci_to_global_list(pci))
214 goto fail0;
215
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
222 if (pci->edac_check) {
223 pci->op_state = OP_RUNNING_POLL;
224
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
228 } else {
229 pci->op_state = OP_RUNNING_INTERRUPT;
230 }
231
232 edac_pci_printk(pci, KERN_INFO,
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));
236
237 mutex_unlock(&edac_pci_ctls_mutex);
238 return 0;
239
240 /* error unwind stack */
241fail1:
242 del_edac_pci_from_global_list(pci);
243fail0:
244 mutex_unlock(&edac_pci_ctls_mutex);
245 return 1;
246}
247EXPORT_SYMBOL_GPL(edac_pci_add_device);
248
249struct edac_pci_ctl_info *edac_pci_del_device(struct device *dev)
250{
251 struct edac_pci_ctl_info *pci;
252
253 edac_dbg(0, "\n");
254
255 mutex_lock(&edac_pci_ctls_mutex);
256
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);
263 return NULL;
264 }
265
266 pci->op_state = OP_OFFLINE;
267
268 del_edac_pci_from_global_list(pci);
269
270 mutex_unlock(&edac_pci_ctls_mutex);
271
272 if (pci->edac_check)
273 edac_stop_work(&pci->work);
274
275 edac_printk(KERN_INFO, EDAC_PCI,
276 "Removed device %d for %s %s: DEV %s\n",
277 pci->pci_idx, pci->mod_name, pci->ctl_name, edac_dev_name(pci));
278
279 return pci;
280}
281EXPORT_SYMBOL_GPL(edac_pci_del_device);
282
283/*
284 * edac_pci_generic_check
285 *
286 * a Generic parity check API
287 */
288static void edac_pci_generic_check(struct edac_pci_ctl_info *pci)
289{
290 edac_dbg(4, "\n");
291 edac_pci_do_parity_check();
292}
293
294/* free running instance index counter */
295static int edac_pci_idx;
296#define EDAC_PCI_GENCTL_NAME "EDAC PCI controller"
297
298struct edac_pci_gen_data {
299 int edac_idx;
300};
301
302struct edac_pci_ctl_info *edac_pci_create_generic_ctl(struct device *dev,
303 const char *mod_name)
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;
319 if (edac_op_state == EDAC_OPSTATE_POLL)
320 pci->edac_check = edac_pci_generic_check;
321
322 pdata->edac_idx = edac_pci_idx++;
323
324 if (edac_pci_add_device(pci, pdata->edac_idx) > 0) {
325 edac_dbg(3, "failed edac_pci_add_device()\n");
326 edac_pci_free_ctl_info(pci);
327 return NULL;
328 }
329
330 return pci;
331}
332EXPORT_SYMBOL_GPL(edac_pci_create_generic_ctl);
333
334void edac_pci_release_generic_ctl(struct edac_pci_ctl_info *pci)
335{
336 edac_dbg(0, "pci mod=%s\n", pci->mod_name);
337
338 edac_pci_del_device(pci->dev);
339 edac_pci_free_ctl_info(pci);
340}
341EXPORT_SYMBOL_GPL(edac_pci_release_generic_ctl);