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);

/* 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;

static struct mem_ctl_info *error_desc_to_mci(struct edac_raw_error_desc *e)
{
	return container_of(e, struct mem_ctl_info, error_desc);
}

unsigned int edac_dimm_info_location(struct dimm_info *dimm, char *buf,
				     unsigned int 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 = scnprintf(p, len, "%s %d ",
			      edac_layer_name[mci->layers[i].type],
			      dimm->location[i]);
		p += n;
		len -= n;
		count += n;
	}

	return count;
}

#ifdef CONFIG_EDAC_DEBUG

static void edac_mc_dump_channel(struct rank_info *chan)
{
	edac_dbg(4, "  channel->chan_idx = %d\n", chan->chan_idx);
	edac_dbg(4, "    channel = %p\n", chan);
	edac_dbg(4, "    channel->csrow = %p\n", chan->csrow);
	edac_dbg(4, "    channel->dimm = %p\n", chan->dimm);
}

static void edac_mc_dump_dimm(struct dimm_info *dimm)
{
	char location[80];

	if (!dimm->nr_pages)
		return;

	edac_dimm_info_location(dimm, location, sizeof(location));

	edac_dbg(4, "%s%i: %smapped as virtual row %d, chan %d\n",
		 dimm->mci->csbased ? "rank" : "dimm",
		 dimm->idx, location, dimm->csrow, dimm->cschannel);
	edac_dbg(4, "  dimm = %p\n", dimm);
	edac_dbg(4, "  dimm->label = '%s'\n", dimm->label);
	edac_dbg(4, "  dimm->nr_pages = 0x%x\n", dimm->nr_pages);
	edac_dbg(4, "  dimm->grain = %d\n", dimm->grain);
}

static void edac_mc_dump_csrow(struct csrow_info *csrow)
{
	edac_dbg(4, "csrow->csrow_idx = %d\n", csrow->csrow_idx);
	edac_dbg(4, "  csrow = %p\n", csrow);
	edac_dbg(4, "  csrow->first_page = 0x%lx\n", csrow->first_page);
	edac_dbg(4, "  csrow->last_page = 0x%lx\n", csrow->last_page);
	edac_dbg(4, "  csrow->page_mask = 0x%lx\n", csrow->page_mask);
	edac_dbg(4, "  csrow->nr_channels = %d\n", csrow->nr_channels);
	edac_dbg(4, "  csrow->channels = %p\n", csrow->channels);
	edac_dbg(4, "  csrow->mci = %p\n", csrow->mci);
}

static void edac_mc_dump_mci(struct mem_ctl_info *mci)
{
	edac_dbg(3, "\tmci = %p\n", mci);
	edac_dbg(3, "\tmci->mtype_cap = %lx\n", mci->mtype_cap);
	edac_dbg(3, "\tmci->edac_ctl_cap = %lx\n", mci->edac_ctl_cap);
	edac_dbg(3, "\tmci->edac_cap = %lx\n", mci->edac_cap);
	edac_dbg(4, "\tmci->edac_check = %p\n", mci->edac_check);
	edac_dbg(3, "\tmci->nr_csrows = %d, csrows = %p\n",
		 mci->nr_csrows, mci->csrows);
	edac_dbg(3, "\tmci->nr_dimms = %d, dimms = %p\n",
		 mci->tot_dimms, mci->dimms);
	edac_dbg(3, "\tdev = %p\n", mci