4 * Author: Dave Jiang <djiang@mvista.com>
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
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>
28 #include "edac_core.h"
29 #include "edac_module.h"
31 static DEFINE_MUTEX(edac_pci_ctls_mutex
);
32 static struct list_head edac_pci_list
= LIST_HEAD_INIT(edac_pci_list
);
34 static inline void edac_lock_pci_list(void)
36 mutex_lock(&edac_pci_ctls_mutex
);
39 static inline void edac_unlock_pci_list(void)
41 mutex_unlock(&edac_pci_ctls_mutex
);
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.
49 struct edac_pci_ctl_info
*edac_pci_alloc_ctl_info(unsigned int sz_pvt
,
50 const char *edac_pci_name
)
52 struct edac_pci_ctl_info
*pci
;
56 pci
= (struct edac_pci_ctl_info
*)0;
57 pvt
= edac_align_ptr(&pci
[1], sz_pvt
);
58 size
= ((unsigned long)pvt
) + sz_pvt
;
60 if ((pci
= kzalloc(size
, GFP_KERNEL
)) == NULL
)
63 pvt
= sz_pvt
? ((char *)pci
) + ((unsigned long)pvt
) : NULL
;
67 pci
->op_state
= OP_ALLOC
;
69 snprintf(pci
->name
, strlen(edac_pci_name
) + 1, "%s", edac_pci_name
);
74 EXPORT_SYMBOL_GPL(edac_pci_alloc_ctl_info
);
77 * edac_pci_free_ctl_info()
78 * frees the memory allocated by edac_pci_alloc_ctl_info() function
80 void edac_pci_free_ctl_info(struct edac_pci_ctl_info
*pci
)
85 EXPORT_SYMBOL_GPL(edac_pci_free_ctl_info
);
88 * find_edac_pci_by_dev()
89 * scans the edac_pci list for a specific 'struct device *'
91 static struct edac_pci_ctl_info
*find_edac_pci_by_dev(struct device
*dev
)
93 struct edac_pci_ctl_info
*pci
;
94 struct list_head
*item
;
96 debugf3("%s()\n", __func__
);
98 list_for_each(item
, &edac_pci_list
) {
99 pci
= list_entry(item
, struct edac_pci_ctl_info
, link
);
109 * add_edac_pci_to_global_list
110 * Before calling this function, caller must assign a unique value to
116 static int add_edac_pci_to_global_list(struct edac_pci_ctl_info
*pci
)
118 struct list_head
*item
, *insert_before
;
119 struct edac_pci_ctl_info
*rover
;
121 insert_before
= &edac_pci_list
;
123 /* Determine if already on the list */
124 if (unlikely((rover
= find_edac_pci_by_dev(pci
->dev
)) != NULL
))
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
);
131 if (rover
->pci_idx
>= pci
->pci_idx
) {
132 if (unlikely(rover
->pci_idx
== pci
->pci_idx
))
135 insert_before
= item
;
140 list_add_tail_rcu(&pci
->link
, insert_before
);
144 edac_printk(KERN_WARNING
, EDAC_PCI
,
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
);
151 edac_printk(KERN_WARNING
, EDAC_PCI
,
152 "but in low-level driver: attempt to assign\n"
153 "\tduplicate pci_idx %d in %s()\n", rover
->pci_idx
,
159 * complete_edac_pci_list_del
161 static void complete_edac_pci_list_del(struct rcu_head
*head
)
163 struct edac_pci_ctl_info
*pci
;
165 pci
= container_of(head
, struct edac_pci_ctl_info
, rcu
);
166 INIT_LIST_HEAD(&pci
->link
);
167 complete(&pci
->complete
);
171 * del_edac_pci_from_global_list
173 static void del_edac_pci_from_global_list(struct edac_pci_ctl_info
*pci
)
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
);
183 * Search for an edac_pci_ctl_info structure whose index is 'idx'
185 * If found, return a pointer to the structure
188 * Caller must hold pci_ctls_mutex.
190 struct edac_pci_ctl_info
*edac_pci_find(int idx
)
192 struct list_head
*item
;
193 struct edac_pci_ctl_info
*pci
;
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
);
199 if (pci
->pci_idx
>= idx
) {
200 if (pci
->pci_idx
== idx
)
203 /* not on list, so terminate early */
211 EXPORT_SYMBOL_GPL(edac_pci_find
);
214 * edac_pci_workq_function()
215 * performs the operation scheduled by a workq request
217 static void edac_pci_workq_function(struct work_struct
*work_req
)
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
);
222 edac_lock_pci_list();
224 if ((pci
->op_state
== OP_RUNNING_POLL
) &&
225 (pci
->edac_check
!= NULL
) && (edac_pci_get_check_errors()))
226 pci
->edac_check(pci
);
228 edac_unlock_pci_list();
231 queue_delayed_work(edac_workqueue
, &pci
->work
,
232 msecs_to_jiffies(edac_pci_get_poll_msec()));
236 * edac_pci_workq_setup()
237 * initialize a workq item for this edac_pci instance
238 * passing in the new delay period in msec
240 static void edac_pci_workq_setup(struct edac_pci_ctl_info
*pci
,
243 debugf0("%s()\n", __func__
);
245 INIT_DELAYED_WORK(&pci
->work
, edac_pci_workq_function
);
246 queue_delayed_work(edac_workqueue
, &pci
->work
,
247 msecs_to_jiffies(edac_pci_get_poll_msec()));
251 * edac_pci_workq_teardown()
252 * stop the workq processing on this edac_pci instance
254 static void edac_pci_workq_teardown(struct edac_pci_ctl_info
*pci
)
258 status
= cancel_delayed_work(&pci
->work
);
260 flush_workqueue(edac_workqueue
);
264 * edac_pci_reset_delay_period
266 void edac_pci_reset_delay_period(struct edac_pci_ctl_info
*pci
,
269 edac_lock_pci_list();
271 edac_pci_workq_teardown(pci
);
273 edac_pci_workq_setup(pci
, value
);
275 edac_unlock_pci_list();
278 EXPORT_SYMBOL_GPL(edac_pci_reset_delay_period
);
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.
292 int edac_pci_add_device(struct edac_pci_ctl_info
*pci
, int edac_idx
)
294 debugf0("%s()\n", __func__
);
296 pci
->pci_idx
= edac_idx
;
298 edac_lock_pci_list();
300 if (add_edac_pci_to_global_list(pci
))
303 pci
->start_time
= jiffies
;
305 if (edac_pci_create_sysfs(pci
)) {
306 edac_pci_printk(pci
, KERN_WARNING
,
307 "failed to create sysfs pci\n");
311 if (pci
->edac_check
!= NULL
) {
312 pci
->op_state
= OP_RUNNING_POLL
;
314 edac_pci_workq_setup(pci
, 1000);
316 pci
->op_state
= OP_RUNNING_INTERRUPT
;
319 edac_pci_printk(pci
, KERN_INFO
,
320 "Giving out device to module '%s' controller '%s':"
324 dev_name(pci
), edac_op_state_to_string(pci
->op_state
));
326 edac_unlock_pci_list();
330 del_edac_pci_from_global_list(pci
);
332 edac_unlock_pci_list();
336 EXPORT_SYMBOL_GPL(edac_pci_add_device
);
339 * edac_pci_del_device()
340 * Remove sysfs entries for specified edac_pci structure and
341 * then remove edac_pci structure from global list
344 * Pointer to 'struct device' representing edac_pci structure
348 * Pointer to removed edac_pci structure,
349 * or NULL if device not found
351 struct edac_pci_ctl_info
*edac_pci_del_device(struct device
*dev
)
353 struct edac_pci_ctl_info
*pci
;
355 debugf0("%s()\n", __func__
);
357 edac_lock_pci_list();
359 if ((pci
= find_edac_pci_by_dev(dev
)) == NULL
) {
360 edac_unlock_pci_list();
364 pci
->op_state
= OP_OFFLINE
;
366 edac_pci_workq_teardown(pci
);
368 edac_pci_remove_sysfs(pci
);
370 del_edac_pci_from_global_list(pci
);
372 edac_unlock_pci_list();
374 edac_printk(KERN_INFO
, EDAC_PCI
,
375 "Removed device %d for %s %s: DEV %s\n",
376 pci
->pci_idx
, pci
->mod_name
, pci
->ctl_name
, dev_name(pci
));
381 EXPORT_SYMBOL_GPL(edac_pci_del_device
);
383 void edac_pci_generic_check(struct edac_pci_ctl_info
*pci
)
385 edac_pci_do_parity_check();
388 static int edac_pci_idx
;
389 #define EDAC_PCI_GENCTL_NAME "EDAC PCI controller"
391 struct edac_pci_gen_data
{
395 struct edac_pci_ctl_info
*edac_pci_create_generic_ctl(struct device
*dev
,
396 const char *mod_name
)
398 struct edac_pci_ctl_info
*pci
;
399 struct edac_pci_gen_data
*pdata
;
401 pci
= edac_pci_alloc_ctl_info(sizeof(*pdata
), EDAC_PCI_GENCTL_NAME
);
405 pdata
= pci
->pvt_info
;
407 dev_set_drvdata(pci
->dev
, pci
);
408 pci
->dev_name
= pci_name(to_pci_dev(dev
));
410 pci
->mod_name
= mod_name
;
411 pci
->ctl_name
= EDAC_PCI_GENCTL_NAME
;
412 pci
->edac_check
= edac_pci_generic_check
;
414 pdata
->edac_idx
= edac_pci_idx
++;
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
);
425 EXPORT_SYMBOL_GPL(edac_pci_create_generic_ctl
);
427 void edac_pci_release_generic_ctl(struct edac_pci_ctl_info
*pci
)
429 edac_pci_del_device(pci
->dev
);
430 edac_pci_free_ctl_info(pci
);
433 EXPORT_SYMBOL_GPL(edac_pci_release_generic_ctl
);