Release 4.14 drivers/edac/edac_pci.c

/*
 * EDAC PCI component
 *
 * Author: Dave Jiang <djiang@mvista.com>
 *
 * 2007 (c) MontaVista Software, Inc. This file is licensed under
 * the terms of the GNU General Public License version 2. This program
 * is licensed "as is" without any warranty of any kind, whether express
 * or implied.
 *
 */
#include <asm/page.h>
#include <linux/uaccess.h>
#include <linux/ctype.h>
#include <linux/highmem.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/smp.h>
#include <linux/spinlock.h>
#include <linux/sysctl.h>
#include <linux/timer.h>

#include "edac_pci.h"
#include "edac_module.h"

static DEFINE_MUTEX(edac_pci_ctls_mutex);
static LIST_HEAD(edac_pci_list);

static atomic_t pci_indexes = ATOMIC_INIT(0);



struct edac_pci_ctl_info *edac_pci_alloc_ctl_info(unsigned int sz_pvt,
						const char *edac_pci_name)
{
	struct edac_pci_ctl_info *pci;
	void *p = NULL, *pvt;
	unsigned int size;

	edac_dbg(1, "\n");

	pci = edac_align_ptr(&p, sizeof(*pci), 1);
	pvt = edac_align_ptr(&p, 1, sz_pvt);
	size = ((unsigned long)pvt) + sz_pvt;

	/* Alloc the needed control struct memory */
	pci = kzalloc(size, GFP_KERNEL);
	if (pci  == NULL)
		return NULL;

	/* Now much private space */
	pvt = sz_pvt ? ((char *)pci) + ((unsigned long)pvt) : NULL;

	pci->pvt_info = pvt;
	pci->op_state = OP_ALLOC;

	snprintf(pci->name, strlen(edac_pci_name) + 1, "%s", edac_pci_name);

	return pci;
}
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Dave Jiang
124
79.49%
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Mauro Carvalho Chehab
20
12.82%
2
40.00%
Doug Thompson
9
5.77%
1
20.00%
Joe Perches
3
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EXPORT_SYMBOL_GPL(edac_pci_alloc_ctl_info);



void edac_pci_free_ctl_info(struct edac_pci_ctl_info *pci)
{
	edac_dbg(1, "\n");

	edac_pci_remove_sysfs(pci);
}
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Dave Jiang
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Doug Thompson
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Joe Perches
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Mauro Carvalho Chehab
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EXPORT_SYMBOL_GPL(edac_pci_free_ctl_info);

/*
 * find_edac_pci_by_dev()
 *      scans the edac_pci list for a specific 'struct device *'
 *
 *      return NULL if not found, or return control struct pointer
 */


static struct edac_pci_ctl_info *find_edac_pci_by_dev(struct device *dev)
{
	struct edac_pci_ctl_info *pci;
	struct list_head *item;

	edac_dbg(1, "\n");

	list_for_each(item, &edac_pci_list) {
		pci = list_entry(item, struct edac_pci_ctl_info, link);

		if (pci->dev == dev)
			return pci;
	}

	return NULL;
}

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Dave Jiang
60
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33.33%
Joe Perches
3
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Mauro Carvalho Chehab
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/*
 * add_edac_pci_to_global_list
 *      Before calling this function, caller must assign a unique value to
 *      edac_dev->pci_idx.
 *      Return:
 *              0 on success
 *              1 on failure
 */


static int add_edac_pci_to_global_list(struct edac_pci_ctl_info *pci)
{
	struct list_head *item, *insert_before;
	struct edac_pci_ctl_info *rover;

	edac_dbg(1, "\n");

	insert_before = &edac_pci_list;

	/* Determine if already on the list */
	rover = find_edac_pci_by_dev(pci->dev);
	if (unlikely(rover != NULL))
		goto fail0;

	/* Insert in ascending order by 'pci_idx', so find position */
	list_for_each(item, &edac_pci_list) {
		rover = list_entry(item, struct edac_pci_ctl_info, link);

		if (rover->pci_idx >= pci->pci_idx) {
			if (unlikely(rover->pci_idx == pci->pci_idx))
				goto fail1;

			insert_before = item;
			break;
		}
	}

	list_add_tail_rcu(&pci->link, insert_before);
	return 0;

fail0:
	edac_printk(KERN_WARNING, EDAC_PCI,
		"%s (%s) %s %s already assigned %d\n",
		dev_name(rover->dev), edac_dev_name(rover),
		rover->mod_name, rover->ctl_name, rover->pci_idx);
	return 1;

fail1:
	edac_printk(KERN_WARNING, EDAC_PCI,
		"but in low-level driver: attempt to assign\n"
		"\tduplicate pci_idx %d in %s()\n", rover->pci_idx,
		__func__);
	return 1;
}

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Dave Jiang
167
90.76%
1
16.67%
Doug Thompson
9
4.89%
1
16.67%
Kay Sievers
3
1.63%
1
16.67%
Joe Perches
3
1.63%
1
16.67%
Stephen Rothwell
1
0.54%
1
16.67%
Mauro Carvalho Chehab
1
0.54%
1
16.67%
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184
100.00%
6
100.00%

/*
 * del_edac_pci_from_global_list
 *
 *      remove the PCI control struct from the global list
 */


static void del_edac_pci_from_global_list(struct edac_pci_ctl_info *pci)
{
	list_del_rcu(&pci->link);

	/* these are for safe removal of devices from global list while
         * NMI handlers may be traversing list
         */
	synchronize_rcu();
	INIT_LIST_HEAD(&pci->link);
}

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50.00%
Lai Jiangshan
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/*
 * edac_pci_workq_function()
 *
 *      periodic function that performs the operation
 *      scheduled by a workq request, for a given PCI control struct
 */


static void edac_pci_workq_function(struct work_struct *work_req)
{
	struct delayed_work *d_work = to_delayed_work(work_req);
	struct edac_pci_ctl_info *pci = to_edac_pci_ctl_work(d_work);
	int msec;
	unsigned long delay;

	edac_dbg(3, "checking\n");

	mutex_lock(&edac_pci_ctls_mutex);

	if (pci->op_state != OP_RUNNING_POLL) {
		mutex_unlock(&edac_pci_ctls_mutex);
		return;
	}

	if (edac_pci_get_check_errors())
		pci->edac_check(pci);

	/* if we are on a one second period, then use round */
	msec = edac_pci_get_poll_msec();
	if (msec == 1000)
		delay = round_jiffies_relative(msecs_to_jiffies(msec));
	else
		delay = msecs_to_jiffies(msec);

	edac_queue_work(&pci->work, delay);

	mutex_unlock(&edac_pci_ctls_mutex);
}

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Doug Thompson
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41.27%
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Borislav Petkov
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Jean Delvare
3
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Joe Perches
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Anton Blanchard
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Mauro Carvalho Chehab
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int edac_pci_alloc_index(void)
{
	return atomic_inc_return(&pci_indexes) - 1;
}
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EXPORT_SYMBOL_GPL(edac_pci_alloc_index);



int edac_pci_add_device(struct edac_pci_ctl_info *pci, int edac_idx)
{
	edac_dbg(0, "\n");

	pci->pci_idx = edac_idx;
	pci->start_time = jiffies;

	mutex_lock(&edac_pci_ctls_mutex);

	if (add_edac_pci_to_global_list(pci))
		goto fail0;

	if (edac_pci_create_sysfs(pci)) {
		edac_pci_printk(pci, KERN_WARNING,
				"failed to create sysfs pci\n");
		goto fail1;
	}

	if (pci->edac_check) {
		pci->op_state = OP_RUNNING_POLL;

		INIT_DELAYED_WORK(&pci->work, edac_pci_workq_function);
		edac_queue_work(&pci->work, msecs_to_jiffies(edac_pci_get_poll_msec()));

	} else {
		pci->op_state = OP_RUNNING_INTERRUPT;
	}

	edac_pci_printk(pci, KERN_INFO,
		"Giving out device to module %s controller %s: DEV %s (%s)\n",
		pci->mod_name, pci->ctl_name, pci->dev_name,
		edac_op_state_to_string(pci->op_state));

	mutex_unlock(&edac_pci_ctls_mutex);
	return 0;

	/* error unwind stack */
fail1:
	del_edac_pci_from_global_list(pci);
fail0:
	mutex_unlock(&edac_pci_ctls_mutex);
	return 1;
}
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13.37%
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28.57%
Borislav Petkov
19
11.05%
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14.29%
Joe Perches
3
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1
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Robert Richter
3
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1
14.29%
Mauro Carvalho Chehab
1
0.58%
1
14.29%
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EXPORT_SYMBOL_GPL(edac_pci_add_device);



struct edac_pci_ctl_info *edac_pci_del_device(struct device *dev)
{
	struct edac_pci_ctl_info *pci;

	edac_dbg(0, "\n");

	mutex_lock(&edac_pci_ctls_mutex);

	/* ensure the control struct is on the global list
         * if not, then leave
         */
	pci = find_edac_pci_by_dev(dev);
	if (pci  == NULL) {
		mutex_unlock(&edac_pci_ctls_mutex);
		return NULL;
	}

	pci->op_state = OP_OFFLINE;

	del_edac_pci_from_global_list(pci);

	mutex_unlock(&edac_pci_ctls_mutex);

	if (pci->edac_check)
		edac_stop_work(&pci->work);

	edac_printk(KERN_INFO, EDAC_PCI,
		"Removed device %d for %s %s: DEV %s\n",
		pci->pci_idx, pci->mod_name, pci->ctl_name, edac_dev_name(pci));

	return pci;
}
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Borislav Petkov
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2
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Joe Perches
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Stephen Rothwell
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EXPORT_SYMBOL_GPL(edac_pci_del_device);

/*
 * edac_pci_generic_check
 *
 *      a Generic parity check API
 */


static void edac_pci_generic_check(struct edac_pci_ctl_info *pci)
{
	edac_dbg(4, "\n");
	edac_pci_do_parity_check();
}

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Doug Thompson
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Adrian Bunk
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Mauro Carvalho Chehab
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/* free running instance index counter */

static int edac_pci_idx;

#define EDAC_PCI_GENCTL_NAME	"EDAC PCI controller"


struct edac_pci_gen_data {
	
int edac_idx;
};



struct edac_pci_ctl_info *edac_pci_create_generic_ctl(struct device *dev,
						const char *mod_name)
{
	struct edac_pci_ctl_info *pci;
	struct edac_pci_gen_data *pdata;

	pci = edac_pci_alloc_ctl_info(sizeof(*pdata), EDAC_PCI_GENCTL_NAME);
	if (!pci)
		return NULL;

	pdata = pci->pvt_info;
	pci->dev = dev;
	dev_set_drvdata(pci->dev, pci);
	pci->dev_name = pci_name(to_pci_dev(dev));

	pci->mod_name = mod_name;
	pci->ctl_name = EDAC_PCI_GENCTL_NAME;
	if (edac_op_state == EDAC_OPSTATE_POLL)
		pci->edac_check = edac_pci_generic_check;

	pdata->edac_idx = edac_pci_idx++;

	if (edac_pci_add_device(pci, pdata->edac_idx) > 0) {
		edac_dbg(3, "failed edac_pci_add_device()\n");
		edac_pci_free_ctl_info(pci);
		return NULL;
	}

	return pci;
}
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6
4.14%
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Joe Perches
3
2.07%
1
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Mauro Carvalho Chehab
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EXPORT_SYMBOL_GPL(edac_pci_create_generic_ctl);



void edac_pci_release_generic_ctl(struct edac_pci_ctl_info *pci)
{
	edac_dbg(0, "pci mod=%s\n", pci->mod_name);

	edac_pci_del_device(pci->dev);
	edac_pci_free_ctl_info(pci);
}
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Joe Perches
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Mauro Carvalho Chehab
1
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EXPORT_SYMBOL_GPL(edac_pci_release_generic_ctl);
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131
10.89%
2
8.70%
Borislav Petkov
45
3.74%
5
21.74%
Mauro Carvalho Chehab
39
3.24%
3
13.04%
Harry Ciao
30
2.49%
1
4.35%
Joe Perches
30
2.49%
1
4.35%
Lai Jiangshan
6
0.50%
1
4.35%
Robert Richter
3
0.25%
1
4.35%
Kay Sievers
3
0.25%
1
4.35%
Jean Delvare
3
0.25%
1
4.35%
Robert P. J. Day
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4.35%
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Directory: drivers/edac

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