Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / edac / edac_pci.c
blob48c844a72a278bc13e72e0af0674b53f3fe06e04
1 /*
2 * EDAC PCI component
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
9 * or implied.
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>
24 #include "edac_pci.h"
25 #include "edac_module.h"
27 static DEFINE_MUTEX(edac_pci_ctls_mutex);
28 static LIST_HEAD(edac_pci_list);
29 static atomic_t pci_indexes = ATOMIC_INIT(0);
31 struct edac_pci_ctl_info *edac_pci_alloc_ctl_info(unsigned int sz_pvt,
32 const char *edac_pci_name)
34 struct edac_pci_ctl_info *pci;
35 void *p = NULL, *pvt;
36 unsigned int size;
38 edac_dbg(1, "\n");
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;
44 /* Alloc the needed control struct memory */
45 pci = kzalloc(size, GFP_KERNEL);
46 if (pci == NULL)
47 return NULL;
49 /* Now much private space */
50 pvt = sz_pvt ? ((char *)pci) + ((unsigned long)pvt) : NULL;
52 pci->pvt_info = pvt;
53 pci->op_state = OP_ALLOC;
55 snprintf(pci->name, strlen(edac_pci_name) + 1, "%s", edac_pci_name);
57 return pci;
59 EXPORT_SYMBOL_GPL(edac_pci_alloc_ctl_info);
61 void edac_pci_free_ctl_info(struct edac_pci_ctl_info *pci)
63 edac_dbg(1, "\n");
65 edac_pci_remove_sysfs(pci);
67 EXPORT_SYMBOL_GPL(edac_pci_free_ctl_info);
70 * find_edac_pci_by_dev()
71 * scans the edac_pci list for a specific 'struct device *'
73 * return NULL if not found, or return control struct pointer
75 static struct edac_pci_ctl_info *find_edac_pci_by_dev(struct device *dev)
77 struct edac_pci_ctl_info *pci;
78 struct list_head *item;
80 edac_dbg(1, "\n");
82 list_for_each(item, &edac_pci_list) {
83 pci = list_entry(item, struct edac_pci_ctl_info, link);
85 if (pci->dev == dev)
86 return pci;
89 return NULL;
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
100 static int add_edac_pci_to_global_list(struct edac_pci_ctl_info *pci)
102 struct list_head *item, *insert_before;
103 struct edac_pci_ctl_info *rover;
105 edac_dbg(1, "\n");
107 insert_before = &edac_pci_list;
109 /* Determine if already on the list */
110 rover = find_edac_pci_by_dev(pci->dev);
111 if (unlikely(rover != NULL))
112 goto fail0;
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);
118 if (rover->pci_idx >= pci->pci_idx) {
119 if (unlikely(rover->pci_idx == pci->pci_idx))
120 goto fail1;
122 insert_before = item;
123 break;
127 list_add_tail_rcu(&pci->link, insert_before);
128 return 0;
130 fail0:
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;
137 fail1:
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;
146 * del_edac_pci_from_global_list
148 * remove the PCI control struct from the global list
150 static void del_edac_pci_from_global_list(struct edac_pci_ctl_info *pci)
152 list_del_rcu(&pci->link);
154 /* these are for safe removal of devices from global list while
155 * NMI handlers may be traversing list
157 synchronize_rcu();
158 INIT_LIST_HEAD(&pci->link);
162 * edac_pci_workq_function()
164 * periodic function that performs the operation
165 * scheduled by a workq request, for a given PCI control struct
167 static void edac_pci_workq_function(struct work_struct *work_req)
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;
174 edac_dbg(3, "checking\n");
176 mutex_lock(&edac_pci_ctls_mutex);
178 if (pci->op_state != OP_RUNNING_POLL) {
179 mutex_unlock(&edac_pci_ctls_mutex);
180 return;
183 if (edac_pci_get_check_errors())
184 pci->edac_check(pci);
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);
193 edac_queue_work(&pci->work, delay);
195 mutex_unlock(&edac_pci_ctls_mutex);
198 int edac_pci_alloc_index(void)
200 return atomic_inc_return(&pci_indexes) - 1;
202 EXPORT_SYMBOL_GPL(edac_pci_alloc_index);
204 int edac_pci_add_device(struct edac_pci_ctl_info *pci, int edac_idx)
206 edac_dbg(0, "\n");
208 pci->pci_idx = edac_idx;
209 pci->start_time = jiffies;
211 mutex_lock(&edac_pci_ctls_mutex);
213 if (add_edac_pci_to_global_list(pci))
214 goto fail0;
216 if (edac_pci_create_sysfs(pci)) {
217 edac_pci_printk(pci, KERN_WARNING,
218 "failed to create sysfs pci\n");
219 goto fail1;
222 if (pci->edac_check) {
223 pci->op_state = OP_RUNNING_POLL;
225 INIT_DELAYED_WORK(&pci->work, edac_pci_workq_function);
226 edac_queue_work(&pci->work, msecs_to_jiffies(edac_pci_get_poll_msec()));
228 } else {
229 pci->op_state = OP_RUNNING_INTERRUPT;
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));
237 mutex_unlock(&edac_pci_ctls_mutex);
238 return 0;
240 /* error unwind stack */
241 fail1:
242 del_edac_pci_from_global_list(pci);
243 fail0:
244 mutex_unlock(&edac_pci_ctls_mutex);
245 return 1;
247 EXPORT_SYMBOL_GPL(edac_pci_add_device);
249 struct edac_pci_ctl_info *edac_pci_del_device(struct device *dev)
251 struct edac_pci_ctl_info *pci;
253 edac_dbg(0, "\n");
255 mutex_lock(&edac_pci_ctls_mutex);
257 /* ensure the control struct is on the global list
258 * if not, then leave
260 pci = find_edac_pci_by_dev(dev);
261 if (pci == NULL) {
262 mutex_unlock(&edac_pci_ctls_mutex);
263 return NULL;
266 pci->op_state = OP_OFFLINE;
268 del_edac_pci_from_global_list(pci);
270 mutex_unlock(&edac_pci_ctls_mutex);
272 if (pci->edac_check)
273 edac_stop_work(&pci->work);
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));
279 return pci;
281 EXPORT_SYMBOL_GPL(edac_pci_del_device);
284 * edac_pci_generic_check
286 * a Generic parity check API
288 static void edac_pci_generic_check(struct edac_pci_ctl_info *pci)
290 edac_dbg(4, "\n");
291 edac_pci_do_parity_check();
294 /* free running instance index counter */
295 static int edac_pci_idx;
296 #define EDAC_PCI_GENCTL_NAME "EDAC PCI controller"
298 struct edac_pci_gen_data {
299 int edac_idx;
302 struct edac_pci_ctl_info *edac_pci_create_generic_ctl(struct device *dev,
303 const char *mod_name)
305 struct edac_pci_ctl_info *pci;
306 struct edac_pci_gen_data *pdata;
308 pci = edac_pci_alloc_ctl_info(sizeof(*pdata), EDAC_PCI_GENCTL_NAME);
309 if (!pci)
310 return NULL;
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));
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;
322 pdata->edac_idx = edac_pci_idx++;
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;
330 return pci;
332 EXPORT_SYMBOL_GPL(edac_pci_create_generic_ctl);
334 void edac_pci_release_generic_ctl(struct edac_pci_ctl_info *pci)
336 edac_dbg(0, "pci mod=%s\n", pci->mod_name);
338 edac_pci_del_device(pci->dev);
339 edac_pci_free_ctl_info(pci);
341 EXPORT_SYMBOL_GPL(edac_pci_release_generic_ctl);