path: root/drivers/edac/edac_mc.c

/*
 * edac_mc kernel module
 * (C) 2005, 2006 Linux Networx (http://lnxi.com)
 * This file may be distributed under the terms of the
 * GNU General Public License.
 *
 * Written by Thayne Harbaugh
 * Based on work by Dan Hollis <goemon at anime dot net> and others.
 *	http://www.anime.net/~goemon/linux-ecc/
 *
 * Modified by Dave Peterson and Doug Thompson
 *
 */

#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/smp.h>
#include <linux/init.h>
#include <linux/sysctl.h>
#include <linux/highmem.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/ctype.h>
#include <linux/edac.h>
#include <linux/bitops.h>
#include <linux/uaccess.h>
#include <asm/page.h>
#include "edac_mc.h"
#include "edac_module.h"
#include <ras/ras_event.h>

#ifdef CONFIG_EDAC_ATOMIC_SCRUB
#include <asm/edac.h>
#else
#define edac_atomic_scrub(va, size) do { } while (0)
#endif

int edac_op_state = EDAC_OPSTATE_INVAL;
EXPORT_SYMBOL_GPL(edac_op_state);

static int edac_report = EDAC_REPORTING_ENABLED;

/* lock to memory controller's control array */
static DEFINE_MUTEX(mem_ctls_mutex);
static LIST_HEAD(mc_devices);

/*
 * Used to lock EDAC MC to just one module, avoiding two drivers e. g.
 *	apei/ghes and i7core_edac to be used at the same time.
 */
static const char *edac_mc_owner;

int edac_get_report_status(void)
{
	return edac_report;
}
EXPORT_SYMBOL_GPL(edac_get_report_status);

void edac_set_report_status(int new)
{
	if (new == EDAC_REPORTING_ENABLED ||
	    new == EDAC_REPORTING_DISABLED ||
	    new == EDAC_REPORTING_FORCE)
		edac_report = new;
}
EXPORT_SYMBOL_GPL(edac_set_report_status);

static int edac_report_set(const char *str, const struct kernel_param *kp)
{
	if (!str)
		return -EINVAL;

	if (!strncmp(str, "on", 2))
		edac_report = EDAC_REPORTING_ENABLED;
	else if (!strncmp(str, "off", 3))
		edac_report = EDAC_REPORTING_DISABLED;
	else if (!strncmp(str, "force", 5))
		edac_report = EDAC_REPORTING_FORCE;

	return 0;
}

static int edac_report_get(char *buffer, const struct kernel_param *kp)
{
	int ret = 0;

	switch (edac_report) {
	case EDAC_REPORTING_ENABLED:
		ret = sprintf(buffer, "on");
		break;
	case EDAC_REPORTING_DISABLED:
		ret = sprintf(buffer, "off");
		break;
	case EDAC_REPORTING_FORCE:
		ret = sprintf(buffer, "force");
		break;
	default:
		ret = -EINVAL;
		break;
	}

	return ret;
}

static const struct kernel_param_ops edac_report_ops = {
	.set = edac_report_set,
	.get = edac_report_get,
};

module_param_cb(edac_report, &edac_report_ops, &edac_report, 0644);

unsigned edac_dimm_info_location(struct dimm_info *dimm, char *buf,
			         unsigned len)
{
	struct mem_ctl_info *mci = dimm->mci;
	int i, n, count = 0;
	char *p = buf;

	for (i = 0; i < mci->n_layers; i++) {
		n = snprintf(p, len, "%s %d ",
			      edac_layer_name[mci->layers[i].type],
			      dimm->location[i]);
		p += n;
		len -= n<