edac_mc.c 51.4 KB
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/*
 * edac_mc kernel module
 * (C) 2005 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/config.h>
#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/sysdev.h>
#include <linux/ctype.h>
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#include <linux/kthread.h>
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#include <asm/uaccess.h>
#include <asm/page.h>
#include <asm/edac.h>
#include "edac_mc.h"

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#define EDAC_MC_VERSION "Ver: 2.0.0 " __DATE__
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/* For now, disable the EDAC sysfs code.  The sysfs interface that EDAC
 * presents to user space needs more thought, and is likely to change
 * substantially.
 */
#define DISABLE_EDAC_SYSFS

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#ifdef CONFIG_EDAC_DEBUG
/* Values of 0 to 4 will generate output */
int edac_debug_level = 1;
EXPORT_SYMBOL(edac_debug_level);
#endif

/* EDAC Controls, setable by module parameter, and sysfs */
static int log_ue = 1;
static int log_ce = 1;
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static int panic_on_ue;
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static int poll_msec = 1000;

static int check_pci_parity = 0;	/* default YES check PCI parity */
static int panic_on_pci_parity;		/* default no panic on PCI Parity */
static atomic_t pci_parity_count = ATOMIC_INIT(0);

/* lock to memory controller's control array */
static DECLARE_MUTEX(mem_ctls_mutex);
static struct list_head mc_devices = LIST_HEAD_INIT(mc_devices);

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static struct task_struct *edac_thread;

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/* Structure of the whitelist and blacklist arrays */
struct edac_pci_device_list {
	unsigned int  vendor;		/* Vendor ID */
	unsigned int  device;		/* Deviice ID */
};

#define MAX_LISTED_PCI_DEVICES		32

/* List of PCI devices (vendor-id:device-id) that should be skipped */
static struct edac_pci_device_list pci_blacklist[MAX_LISTED_PCI_DEVICES];
static int pci_blacklist_count;

/* List of PCI devices (vendor-id:device-id) that should be scanned */
static struct edac_pci_device_list pci_whitelist[MAX_LISTED_PCI_DEVICES];
static int pci_whitelist_count ;

/*  START sysfs data and methods */

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#ifndef DISABLE_EDAC_SYSFS

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static const char *mem_types[] = {
	[MEM_EMPTY] = "Empty",
	[MEM_RESERVED] = "Reserved",
	[MEM_UNKNOWN] = "Unknown",
	[MEM_FPM] = "FPM",
	[MEM_EDO] = "EDO",
	[MEM_BEDO] = "BEDO",
	[MEM_SDR] = "Unbuffered-SDR",
	[MEM_RDR] = "Registered-SDR",
	[MEM_DDR] = "Unbuffered-DDR",
	[MEM_RDDR] = "Registered-DDR",
	[MEM_RMBS] = "RMBS"
};

static const char *dev_types[] = {
	[DEV_UNKNOWN] = "Unknown",
	[DEV_X1] = "x1",
	[DEV_X2] = "x2",
	[DEV_X4] = "x4",
	[DEV_X8] = "x8",
	[DEV_X16] = "x16",
	[DEV_X32] = "x32",
	[DEV_X64] = "x64"
};

static const char *edac_caps[] = {
	[EDAC_UNKNOWN] = "Unknown",
	[EDAC_NONE] = "None",
	[EDAC_RESERVED] = "Reserved",
	[EDAC_PARITY] = "PARITY",
	[EDAC_EC] = "EC",
	[EDAC_SECDED] = "SECDED",
	[EDAC_S2ECD2ED] = "S2ECD2ED",
	[EDAC_S4ECD4ED] = "S4ECD4ED",
	[EDAC_S8ECD8ED] = "S8ECD8ED",
	[EDAC_S16ECD16ED] = "S16ECD16ED"
};

/* sysfs object: /sys/devices/system/edac */
static struct sysdev_class edac_class = {
	set_kset_name("edac"),
};

/* sysfs objects:
 *	/sys/devices/system/edac/mc
 *	/sys/devices/system/edac/pci
 */
static struct kobject edac_memctrl_kobj;
static struct kobject edac_pci_kobj;

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/* We use these to wait for the reference counts on edac_memctrl_kobj and
 * edac_pci_kobj to reach 0.
 */
static struct completion edac_memctrl_kobj_complete;
static struct completion edac_pci_kobj_complete;

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/*
 * /sys/devices/system/edac/mc;
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 *	data structures and methods
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 */
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#if 0
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static ssize_t memctrl_string_show(void *ptr, char *buffer)
{
	char *value = (char*) ptr;
	return sprintf(buffer, "%s\n", value);
}
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#endif
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static ssize_t memctrl_int_show(void *ptr, char *buffer)
{
	int *value = (int*) ptr;
	return sprintf(buffer, "%d\n", *value);
}

static ssize_t memctrl_int_store(void *ptr, const char *buffer, size_t count)
{
	int *value = (int*) ptr;

	if (isdigit(*buffer))
		*value = simple_strtoul(buffer, NULL, 0);

	return count;
}

struct memctrl_dev_attribute {
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	struct attribute attr;
	void *value;
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	ssize_t (*show)(void *,char *);
	ssize_t (*store)(void *, const char *, size_t);
};

/* Set of show/store abstract level functions for memory control object */
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static ssize_t memctrl_dev_show(struct kobject *kobj,
		struct attribute *attr, char *buffer)
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{
	struct memctrl_dev_attribute *memctrl_dev;
	memctrl_dev = (struct memctrl_dev_attribute*)attr;

	if (memctrl_dev->show)
		return memctrl_dev->show(memctrl_dev->value, buffer);
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	return -EIO;
}

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static ssize_t memctrl_dev_store(struct kobject *kobj, struct attribute *attr,
		const char *buffer, size_t count)
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{
	struct memctrl_dev_attribute *memctrl_dev;
	memctrl_dev = (struct memctrl_dev_attribute*)attr;

	if (memctrl_dev->store)
		return memctrl_dev->store(memctrl_dev->value, buffer, count);
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	return -EIO;
}

static struct sysfs_ops memctrlfs_ops = {
	.show   = memctrl_dev_show,
	.store  = memctrl_dev_store
};

#define MEMCTRL_ATTR(_name,_mode,_show,_store)			\
struct memctrl_dev_attribute attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.value  = &_name,					\
	.show   = _show,					\
	.store  = _store,					\
};

#define MEMCTRL_STRING_ATTR(_name,_data,_mode,_show,_store)	\
struct memctrl_dev_attribute attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.value  = _data,					\
	.show   = _show,					\
	.store  = _store,					\
};

/* cwrow<id> attribute f*/
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#if 0
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MEMCTRL_STRING_ATTR(mc_version,EDAC_MC_VERSION,S_IRUGO,memctrl_string_show,NULL);
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#endif
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/* csrow<id> control files */
MEMCTRL_ATTR(panic_on_ue,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
MEMCTRL_ATTR(log_ue,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
MEMCTRL_ATTR(log_ce,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
MEMCTRL_ATTR(poll_msec,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);

/* Base Attributes of the memory ECC object */
static struct memctrl_dev_attribute *memctrl_attr[] = {
	&attr_panic_on_ue,
	&attr_log_ue,
	&attr_log_ce,
	&attr_poll_msec,
	NULL,
};

/* Main MC kobject release() function */
static void edac_memctrl_master_release(struct kobject *kobj)
{
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	debugf1("%s()\n", __func__);
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	complete(&edac_memctrl_kobj_complete);
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}

static struct kobj_type ktype_memctrl = {
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	.release = edac_memctrl_master_release,
	.sysfs_ops = &memctrlfs_ops,
	.default_attrs = (struct attribute **) memctrl_attr,
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};

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#endif  /* DISABLE_EDAC_SYSFS */
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/* Initialize the main sysfs entries for edac:
 *   /sys/devices/system/edac
 *
 * and children
 *
 * Return:  0 SUCCESS
 *         !0 FAILURE
 */
static int edac_sysfs_memctrl_setup(void)
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#ifdef DISABLE_EDAC_SYSFS
{
	return 0;
}
#else
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{
	int err=0;

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	debugf1("%s()\n", __func__);
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	/* create the /sys/devices/system/edac directory */
	err = sysdev_class_register(&edac_class);
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	if (!err) {
		/* Init the MC's kobject */
		memset(&edac_memctrl_kobj, 0, sizeof (edac_memctrl_kobj));
		edac_memctrl_kobj.parent = &edac_class.kset.kobj;
		edac_memctrl_kobj.ktype = &ktype_memctrl;

		/* generate sysfs "..../edac/mc"   */
		err = kobject_set_name(&edac_memctrl_kobj,"mc");
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		if (!err) {
			/* FIXME: maybe new sysdev_create_subdir() */
			err = kobject_register(&edac_memctrl_kobj);
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			if (err)
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				debugf1("Failed to register '.../edac/mc'\n");
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			else
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				debugf1("Registered '.../edac/mc' kobject\n");
		}
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	} else
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		debugf1("%s() error=%d\n", __func__, err);
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	return err;
}
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#endif  /* DISABLE_EDAC_SYSFS */
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/*
 * MC teardown:
 *	the '..../edac/mc' kobject followed by '..../edac' itself
 */
static void edac_sysfs_memctrl_teardown(void)
{
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	debugf0("MC: " __FILE__ ": %s()\n", __func__);

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	/* Unregister the MC's kobject and wait for reference count to reach
	 * 0.
	 */
	init_completion(&edac_memctrl_kobj_complete);
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	kobject_unregister(&edac_memctrl_kobj);
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	wait_for_completion(&edac_memctrl_kobj_complete);
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	/* Unregister the 'edac' object */
	sysdev_class_unregister(&edac_class);
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#endif  /* DISABLE_EDAC_SYSFS */
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}

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#ifndef DISABLE_EDAC_SYSFS

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/*
 * /sys/devices/system/edac/pci;
 * 	data structures and methods
 */

struct list_control {
	struct edac_pci_device_list *list;
	int *count;
};

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/* Output the list as:  vendor_id:device:id<,vendor_id:device_id> */
static ssize_t edac_pci_list_string_show(void *ptr, char *buffer)
{
	struct list_control *listctl;
	struct edac_pci_device_list *list;
	char *p = buffer;
	int len=0;
	int i;

	listctl = ptr;
	list = listctl->list;

	for (i = 0; i < *(listctl->count); i++, list++ ) {
		if (len > 0)
			len += snprintf(p + len, (PAGE_SIZE-len), ",");

		len += snprintf(p + len,
				(PAGE_SIZE-len),
				"%x:%x",
				list->vendor,list->device);
	}

	len += snprintf(p + len,(PAGE_SIZE-len), "\n");
	return (ssize_t) len;
}

/**
 *
 * Scan string from **s to **e looking for one 'vendor:device' tuple
 * where each field is a hex value
 *
 * return 0 if an entry is NOT found
 * return 1 if an entry is found
 *	fill in *vendor_id and *device_id with values found
 *
 * In both cases, make sure *s has been moved forward toward *e
 */
static int parse_one_device(const char **s,const char **e,
	unsigned int *vendor_id, unsigned int *device_id)
{
	const char *runner, *p;

	/* if null byte, we are done */
	if (!**s) {
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		(*s)++;  /* keep *s moving */
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		return 0;
	}

	/* skip over newlines & whitespace */
	if ((**s == '\n') || isspace(**s)) {
		(*s)++;
		return 0;
	}

	if (!isxdigit(**s)) {
		(*s)++;
		return 0;
	}

	/* parse vendor_id */
	runner = *s;
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	while (runner < *e) {
		/* scan for vendor:device delimiter */
		if (*runner == ':') {
			*vendor_id = simple_strtol((char*) *s, (char**) &p, 16);
			runner = p + 1;
			break;
		}
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		runner++;
	}

	if (!isxdigit(*runner)) {
		*s = ++runner;
		return 0;
	}

	/* parse device_id */
	if (runner < *e) {
		*device_id = simple_strtol((char*)runner, (char**)&p, 16);
		runner = p;
	}

	*s = runner;
	return 1;
}

static ssize_t edac_pci_list_string_store(void *ptr, const char *buffer,
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		size_t count)
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{
	struct list_control *listctl;
	struct edac_pci_device_list *list;
	unsigned int vendor_id, device_id;
	const char *s, *e;
	int *index;

	s = (char*)buffer;
	e = s + count;
	listctl = ptr;
	list = listctl->list;
	index = listctl->count;
	*index = 0;

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	while (*index < MAX_LISTED_PCI_DEVICES) {
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		if (parse_one_device(&s,&e,&vendor_id,&device_id)) {
			list[ *index ].vendor = vendor_id;
			list[ *index ].device = device_id;
			(*index)++;
		}

		/* check for all data consume */
		if (s >= e)
			break;
	}

	return count;
}

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static ssize_t edac_pci_int_show(void *ptr, char *buffer)
{
	int *value = ptr;
	return sprintf(buffer,"%d\n",*value);
}

static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count)
{
	int *value = ptr;

	if (isdigit(*buffer))
		*value = simple_strtoul(buffer,NULL,0);

	return count;
}

struct edac_pci_dev_attribute {
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	struct attribute attr;
	void *value;
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	ssize_t (*show)(void *,char *);
	ssize_t (*store)(void *, const char *,size_t);
};

/* Set of show/store abstract level functions for PCI Parity object */
static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr,
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		char *buffer)
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{
	struct edac_pci_dev_attribute *edac_pci_dev;
	edac_pci_dev= (struct edac_pci_dev_attribute*)attr;

	if (edac_pci_dev->show)
		return edac_pci_dev->show(edac_pci_dev->value, buffer);
	return -EIO;
}

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static ssize_t edac_pci_dev_store(struct kobject *kobj,
		struct attribute *attr, const char *buffer, size_t count)
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{
	struct edac_pci_dev_attribute *edac_pci_dev;
	edac_pci_dev= (struct edac_pci_dev_attribute*)attr;

	if (edac_pci_dev->show)
		return edac_pci_dev->store(edac_pci_dev->value, buffer, count);
	return -EIO;
}

static struct sysfs_ops edac_pci_sysfs_ops = {
	.show   = edac_pci_dev_show,
	.store  = edac_pci_dev_store
};

#define EDAC_PCI_ATTR(_name,_mode,_show,_store)			\
struct edac_pci_dev_attribute edac_pci_attr_##_name = {		\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.value  = &_name,					\
	.show   = _show,					\
	.store  = _store,					\
};

#define EDAC_PCI_STRING_ATTR(_name,_data,_mode,_show,_store)	\
struct edac_pci_dev_attribute edac_pci_attr_##_name = {		\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.value  = _data,					\
	.show   = _show,					\
	.store  = _store,					\
};

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static struct list_control pci_whitelist_control = {
	.list = pci_whitelist,
	.count = &pci_whitelist_count
};

static struct list_control pci_blacklist_control = {
	.list = pci_blacklist,
	.count = &pci_blacklist_count
};

/* whitelist attribute */
EDAC_PCI_STRING_ATTR(pci_parity_whitelist,
	&pci_whitelist_control,
	S_IRUGO|S_IWUSR,
	edac_pci_list_string_show,
	edac_pci_list_string_store);

EDAC_PCI_STRING_ATTR(pci_parity_blacklist,
	&pci_blacklist_control,
	S_IRUGO|S_IWUSR,
	edac_pci_list_string_show,
	edac_pci_list_string_store);
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#endif
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/* PCI Parity control files */
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EDAC_PCI_ATTR(check_pci_parity, S_IRUGO|S_IWUSR, edac_pci_int_show,
	edac_pci_int_store);
EDAC_PCI_ATTR(panic_on_pci_parity, S_IRUGO|S_IWUSR, edac_pci_int_show,
	edac_pci_int_store);
EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL);
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/* Base Attributes of the memory ECC object */
static struct edac_pci_dev_attribute *edac_pci_attr[] = {
	&edac_pci_attr_check_pci_parity,
	&edac_pci_attr_panic_on_pci_parity,
	&edac_pci_attr_pci_parity_count,
	NULL,
};

/* No memory to release */
static void edac_pci_release(struct kobject *kobj)
{
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	debugf1("%s()\n", __func__);
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	complete(&edac_pci_kobj_complete);
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}

static struct kobj_type ktype_edac_pci = {
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	.release = edac_pci_release,
	.sysfs_ops = &edac_pci_sysfs_ops,
	.default_attrs = (struct attribute **) edac_pci_attr,
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};

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#endif  /* DISABLE_EDAC_SYSFS */

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/**
 * edac_sysfs_pci_setup()
 *
 */
static int edac_sysfs_pci_setup(void)
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#ifdef DISABLE_EDAC_SYSFS
{
	return 0;
}
#else
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{
	int err;

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	debugf1("%s()\n", __func__);
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	memset(&edac_pci_kobj, 0, sizeof(edac_pci_kobj));
	edac_pci_kobj.parent = &edac_class.kset.kobj;
	edac_pci_kobj.ktype = &ktype_edac_pci;
	err = kobject_set_name(&edac_pci_kobj, "pci");
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	if (!err) {
		/* Instanstiate the csrow object */
		/* FIXME: maybe new sysdev_create_subdir() */
		err = kobject_register(&edac_pci_kobj);
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		if (err)
			debugf1("Failed to register '.../edac/pci'\n");
		else
			debugf1("Registered '.../edac/pci' kobject\n");
	}
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	return err;
}
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#endif  /* DISABLE_EDAC_SYSFS */
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static void edac_sysfs_pci_teardown(void)
{
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#ifndef DISABLE_EDAC_SYSFS
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	debugf0("%s()\n", __func__);
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	init_completion(&edac_pci_kobj_complete);
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	kobject_unregister(&edac_pci_kobj);
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	wait_for_completion(&edac_pci_kobj_complete);
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#endif
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}

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#ifndef DISABLE_EDAC_SYSFS

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/* EDAC sysfs CSROW data structures and methods */

/* Set of more detailed csrow<id> attribute show/store functions */
static ssize_t csrow_ch0_dimm_label_show(struct csrow_info *csrow, char *data)
{
	ssize_t size = 0;

	if (csrow->nr_channels > 0) {
		size = snprintf(data, EDAC_MC_LABEL_LEN,"%s\n",
			csrow->channels[0].label);
	}
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	return size;
}

static ssize_t csrow_ch1_dimm_label_show(struct csrow_info *csrow, char *data)
{
	ssize_t size = 0;

	if (csrow->nr_channels > 0) {
		size = snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
			csrow->channels[1].label);
	}
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	return size;
}

static ssize_t csrow_ch0_dimm_label_store(struct csrow_info *csrow,
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		const char *data, size_t size)
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{
	ssize_t max_size = 0;

	if (csrow->nr_channels > 0) {
		max_size = min((ssize_t)size,(ssize_t)EDAC_MC_LABEL_LEN-1);
		strncpy(csrow->channels[0].label, data, max_size);
		csrow->channels[0].label[max_size] = '\0';
	}
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	return size;
}

static ssize_t csrow_ch1_dimm_label_store(struct csrow_info *csrow,
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		const char *data, size_t size)
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{
	ssize_t max_size = 0;

	if (csrow->nr_channels > 1) {
		max_size = min((ssize_t)size,(ssize_t)EDAC_MC_LABEL_LEN-1);
		strncpy(csrow->channels[1].label, data, max_size);
		csrow->channels[1].label[max_size] = '\0';
	}
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	return max_size;
}

static ssize_t csrow_ue_count_show(struct csrow_info *csrow, char *data)
{
	return sprintf(data,"%u\n", csrow->ue_count);
}

static ssize_t csrow_ce_count_show(struct csrow_info *csrow, char *data)
{
	return sprintf(data,"%u\n", csrow->ce_count);
}

static ssize_t csrow_ch0_ce_count_show(struct csrow_info *csrow, char *data)
{
	ssize_t size = 0;

	if (csrow->nr_channels > 0) {
		size = sprintf(data,"%u\n", csrow->channels[0].ce_count);
	}
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	return size;
}

static ssize_t csrow_ch1_ce_count_show(struct csrow_info *csrow, char *data)
{
	ssize_t size = 0;

	if (csrow->nr_channels > 1) {
		size = sprintf(data,"%u\n", csrow->channels[1].ce_count);
	}
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	return size;
}

static ssize_t csrow_size_show(struct csrow_info *csrow, char *data)
{
	return sprintf(data,"%u\n", PAGES_TO_MiB(csrow->nr_pages));
}

static ssize_t csrow_mem_type_show(struct csrow_info *csrow, char *data)
{
	return sprintf(data,"%s\n", mem_types[csrow->mtype]);
}

static ssize_t csrow_dev_type_show(struct csrow_info *csrow, char *data)
{
	return sprintf(data,"%s\n", dev_types[csrow->dtype]);
}

static ssize_t csrow_edac_mode_show(struct csrow_info *csrow, char *data)
{
	return sprintf(data,"%s\n", edac_caps[csrow->edac_mode]);
}

struct csrowdev_attribute {
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	struct attribute attr;
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	ssize_t (*show)(struct csrow_info *,char *);
	ssize_t (*store)(struct csrow_info *, const char *,size_t);
};

#define to_csrow(k) container_of(k, struct csrow_info, kobj)
#define to_csrowdev_attr(a) container_of(a, struct csrowdev_attribute, attr)

/* Set of show/store higher level functions for csrow objects */
static ssize_t csrowdev_show(struct kobject *kobj, struct attribute *attr,
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		char *buffer)
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{
	struct csrow_info *csrow = to_csrow(kobj);
	struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);

	if (csrowdev_attr->show)
		return csrowdev_attr->show(csrow, buffer);
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	return -EIO;
}

static ssize_t csrowdev_store(struct kobject *kobj, struct attribute *attr,
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		const char *buffer, size_t count)
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{
	struct csrow_info *csrow = to_csrow(kobj);
	struct csrowdev_attribute * csrowdev_attr = to_csrowdev_attr(attr);

	if (csrowdev_attr->store)
		return csrowdev_attr->store(csrow, buffer, count);
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	return -EIO;
}

static struct sysfs_ops csrowfs_ops = {
	.show   = csrowdev_show,
	.store  = csrowdev_store
};

#define CSROWDEV_ATTR(_name,_mode,_show,_store)			\
struct csrowdev_attribute attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.show   = _show,					\
	.store  = _store,					\
};

/* cwrow<id>/attribute files */
CSROWDEV_ATTR(size_mb,S_IRUGO,csrow_size_show,NULL);
CSROWDEV_ATTR(dev_type,S_IRUGO,csrow_dev_type_show,NULL);
CSROWDEV_ATTR(mem_type,S_IRUGO,csrow_mem_type_show,NULL);
CSROWDEV_ATTR(edac_mode,S_IRUGO,csrow_edac_mode_show,NULL);
CSROWDEV_ATTR(ue_count,S_IRUGO,csrow_ue_count_show,NULL);
CSROWDEV_ATTR(ce_count,S_IRUGO,csrow_ce_count_show,NULL);
CSROWDEV_ATTR(ch0_ce_count,S_IRUGO,csrow_ch0_ce_count_show,NULL);
CSROWDEV_ATTR(ch1_ce_count,S_IRUGO,csrow_ch1_ce_count_show,NULL);

/* control/attribute files */
CSROWDEV_ATTR(ch0_dimm_label,S_IRUGO|S_IWUSR,
		csrow_ch0_dimm_label_show,
		csrow_ch0_dimm_label_store);
CSROWDEV_ATTR(ch1_dimm_label,S_IRUGO|S_IWUSR,
		csrow_ch1_dimm_label_show,
		csrow_ch1_dimm_label_store);

/* Attributes of the CSROW<id> object */
static struct csrowdev_attribute *csrow_attr[] = {
	&attr_dev_type,
	&attr_mem_type,
	&attr_edac_mode,
	&attr_size_mb,
	&attr_ue_count,
	&attr_ce_count,
	&attr_ch0_ce_count,
	&attr_ch1_ce_count,
	&attr_ch0_dimm_label,
	&attr_ch1_dimm_label,
	NULL,
};

/* No memory to release */
static void edac_csrow_instance_release(struct kobject *kobj)
{
818 819
	struct csrow_info *cs;

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	cs = container_of(kobj, struct csrow_info, kobj);
	complete(&cs->kobj_complete);
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}

static struct kobj_type ktype_csrow = {
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	.release = edac_csrow_instance_release,
	.sysfs_ops = &csrowfs_ops,
	.default_attrs = (struct attribute **) csrow_attr,
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};

/* Create a CSROW object under specifed edac_mc_device */
static int edac_create_csrow_object(struct kobject *edac_mci_kobj,
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		struct csrow_info *csrow, int index)
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{
	int err = 0;

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	debugf0("%s()\n", __func__);
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	memset(&csrow->kobj, 0, sizeof(csrow->kobj));

	/* generate ..../edac/mc/mc<id>/csrow<index>   */

	csrow->kobj.parent = edac_mci_kobj;
	csrow->kobj.ktype = &ktype_csrow;

	/* name this instance of csrow<id> */
	err = kobject_set_name(&csrow->kobj,"csrow%d",index);
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	if (!err) {
		/* Instanstiate the csrow object */
		err = kobject_register(&csrow->kobj);
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		if (err)
			debugf0("Failed to register CSROW%d\n",index);
		else
			debugf0("Registered CSROW%d\n",index);
	}

	return err;
}

/* sysfs data structures and methods for the MCI kobjects */

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static ssize_t mci_reset_counters_store(struct mem_ctl_info *mci,
		const char *data, size_t count)
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{
	int row, chan;

	mci->ue_noinfo_count = 0;
	mci->ce_noinfo_count = 0;
	mci->ue_count = 0;
	mci->ce_count = 0;
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	for (row = 0; row < mci->nr_csrows; row++) {
		struct csrow_info *ri = &mci->csrows[row];

		ri->ue_count = 0;
		ri->ce_count = 0;
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		for (chan = 0; chan < ri->nr_channels; chan++)
			ri->channels[chan].ce_count = 0;
	}

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	mci->start_time = jiffies;
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	return count;
}

static ssize_t mci_ue_count_show(struct mem_ctl_info *mci, char *data)
{
	return sprintf(data,"%d\n", mci->ue_count);
}

static ssize_t mci_ce_count_show(struct mem_ctl_info *mci, char *data)
{
	return sprintf(data,"%d\n", mci->ce_count);
}

static ssize_t mci_ce_noinfo_show(struct mem_ctl_info *mci, char *data)
{
	return sprintf(data,"%d\n", mci->ce_noinfo_count);
}

static ssize_t mci_ue_noinfo_show(struct mem_ctl_info *mci, char *data)
{
	return sprintf(data,"%d\n", mci->ue_noinfo_count);
}

static ssize_t mci_seconds_show(struct mem_ctl_info *mci, char *data)
{
	return sprintf(data,"%ld\n", (jiffies - mci->start_time) / HZ);
}

static ssize_t mci_mod_name_show(struct mem_ctl_info *mci, char *data)
{
	return sprintf(data,"%s %s\n", mci->mod_name, mci->mod_ver);
}

static ssize_t mci_ctl_name_show(struct mem_ctl_info *mci, char *data)
{
	return sprintf(data,"%s\n", mci->ctl_name);
}

static int mci_output_edac_cap(char *buf, unsigned long edac_cap)
{
	char *p = buf;
	int bit_idx;

	for (bit_idx = 0; bit_idx < 8 * sizeof(edac_cap); bit_idx++) {
		if ((edac_cap >> bit_idx) & 0x1)
			p += sprintf(p, "%s ", edac_caps[bit_idx]);
	}

	return p - buf;
}

static ssize_t mci_edac_capability_show(struct mem_ctl_info *mci, char *data)
{
	char *p = data;

	p += mci_output_edac_cap(p,mci->edac_ctl_cap);
	p += sprintf(p, "\n");
	return p - data;
}

static ssize_t mci_edac_current_capability_show(struct mem_ctl_info *mci,
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{
	char *p = data;

	p += mci_output_edac_cap(p,mci->edac_cap);
	p += sprintf(p, "\n");
	return p - data;
}

static int mci_output_mtype_cap(char *buf, unsigned long mtype_cap)
{
	char *p = buf;
	int bit_idx;

	for (bit_idx = 0; bit_idx < 8 * sizeof(mtype_cap); bit_idx++) {
		if ((mtype_cap >> bit_idx) & 0x1)
			p += sprintf(p, "%s ", mem_types[bit_idx]);
	}

	return p - buf;
}

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static ssize_t mci_supported_mem_type_show(struct mem_ctl_info *mci,
		char *data)
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{
	char *p = data;

	p += mci_output_mtype_cap(p,mci->mtype_cap);
	p += sprintf(p, "\n");
	return p - data;
}

static ssize_t mci_size_mb_show(struct mem_ctl_info *mci, char *data)
{
	int total_pages, csrow_idx;

	for (total_pages = csrow_idx = 0; csrow_idx < mci->nr_csrows;
			csrow_idx++) {
		struct csrow_info *csrow = &mci->csrows[csrow_idx];

		if (!csrow->nr_pages)
			continue;
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		total_pages += csrow->nr_pages;
	}

	return sprintf(data,"%u\n", PAGES_TO_MiB(total_pages));
}

struct mcidev_attribute {
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	struct attribute attr;
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	ssize_t (*show)(struct mem_ctl_info *,char *);
	ssize_t (*store)(struct mem_ctl_info *, const char *,size_t);
};

#define to_mci(k) container_of(k, struct mem_ctl_info, edac_mci_kobj)
#define to_mcidev_attr(a) container_of(a, struct mcidev_attribute, attr)

static ssize_t mcidev_show(struct kobject *kobj, struct attribute *attr,
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		char *buffer)
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{
	struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
	struct mcidev_attribute * mcidev_attr = to_mcidev_attr(attr);

	if (mcidev_attr->show)
		return mcidev_attr->show(mem_ctl_info, buffer);
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	return -EIO;
}

static ssize_t mcidev_store(struct kobject *kobj, struct attribute *attr,
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		const char *buffer, size_t count)
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{
	struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
	struct mcidev_attribute * mcidev_attr = to_mcidev_attr(attr);

	if (mcidev_attr->store)
		return mcidev_attr->store(mem_ctl_info, buffer, count);
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	return -EIO;
}

static struct sysfs_ops mci_ops = {
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	.show = mcidev_show,
	.store = mcidev_store
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};

#define MCIDEV_ATTR(_name,_mode,_show,_store)			\
struct mcidev_attribute mci_attr_##_name = {			\
	.attr = {.name = __stringify(_name), .mode = _mode },	\
	.show   = _show,					\
	.store  = _store,					\
};

/* Control file */
MCIDEV_ATTR(reset_counters,S_IWUSR,NULL,mci_reset_counters_store);

/* Attribute files */
MCIDEV_ATTR(mc_name,S_IRUGO,mci_ctl_name_show,NULL);
MCIDEV_ATTR(module_name,S_IRUGO,mci_mod_name_show,NULL);
MCIDEV_ATTR(edac_capability,S_IRUGO,mci_edac_capability_show,NULL);
MCIDEV_ATTR(size_mb,S_IRUGO,mci_size_mb_show,NULL);
MCIDEV_ATTR(seconds_since_reset,S_IRUGO,mci_seconds_show,NULL);
MCIDEV_ATTR(ue_noinfo_count,S_IRUGO,mci_ue_noinfo_show,NULL);
MCIDEV_ATTR(ce_noinfo_count,S_IRUGO,mci_ce_noinfo_show,NULL);
MCIDEV_ATTR(ue_count,S_IRUGO,mci_ue_count_show,NULL);
MCIDEV_ATTR(ce_count,S_IRUGO,mci_ce_count_show,NULL);
MCIDEV_ATTR(edac_current_capability,S_IRUGO,
	mci_edac_current_capability_show,NULL);
MCIDEV_ATTR(supported_mem_type,S_IRUGO,
	mci_supported_mem_type_show,NULL);

static struct mcidev_attribute *mci_attr[] = {
	&mci_attr_reset_counters,
	&mci_attr_module_name,
	&mci_attr_mc_name,
	&mci_attr_edac_capability,
	&mci_attr_edac_current_capability,
	&mci_attr_supported_mem_type,
	&mci_attr_size_mb,
	&mci_attr_seconds_since_reset,
	&mci_attr_ue_noinfo_count,
	&mci_attr_ce_noinfo_count,
	&mci_attr_ue_count,
	&mci_attr_ce_count,
	NULL
};

/*
 * Release of a MC controlling instance
 */
static void edac_mci_instance_release(struct kobject *kobj)
{
	struct mem_ctl_info *mci;

1080 1081 1082
	mci = to_mci(kobj);
	debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
	complete(&mci->kobj_complete);
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}

static struct kobj_type ktype_mci = {
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	.release = edac_mci_instance_release,
	.sysfs_ops = &mci_ops,
	.default_attrs = (struct attribute **) mci_attr,
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};

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#endif  /* DISABLE_EDAC_SYSFS */

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#define EDAC_DEVICE_SYMLINK	"device"

/*
 * Create a new Memory Controller kobject instance,
 *	mc<id> under the 'mc' directory
 *
 * Return:
 *	0	Success
 *	!0	Failure
 */
static int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
1104 1105 1106 1107 1108
#ifdef DISABLE_EDAC_SYSFS
{
	return 0;
}
#else
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{
	int i;
	int err;
	struct csrow_info *csrow;
	struct kobject *edac_mci_kobj=&mci->edac_mci_kobj;

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	debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
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	memset(edac_mci_kobj, 0, sizeof(*edac_mci_kobj));

	/* set the name of the mc<id> object */
	err = kobject_set_name(edac_mci_kobj,"mc%d",mci->mc_idx);
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	if (err)
		return err;

	/* link to our parent the '..../edac/mc' object */
	edac_mci_kobj->parent = &edac_memctrl_kobj;
	edac_mci_kobj->ktype = &ktype_mci;

	/* register the mc<id> kobject */
	err = kobject_register(edac_mci_kobj);
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	if (err)
		return err;

	/* create a symlink for the device */
	err = sysfs_create_link(edac_mci_kobj, &mci->pdev->dev.kobj,
				EDAC_DEVICE_SYMLINK);
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	if (err)
		goto fail0;
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	/* Make directories for each CSROW object
	 * under the mc<id> kobject
	 */
	for (i = 0; i < mci->nr_csrows; i++) {
		csrow = &mci->csrows[i];

		/* Only expose populated CSROWs */
		if (csrow->nr_pages > 0) {
			err = edac_create_csrow_object(edac_mci_kobj,csrow,i);
D
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1150

A
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1151
			if (err)
1152
				goto fail1;
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1153 1154 1155 1156 1157 1158
		}
	}

	return 0;

	/* CSROW error: backout what has already been registered,  */
1159
fail1:
A
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1160
	for ( i--; i >= 0; i--) {
1161 1162
		if (csrow->nr_pages > 0) {
			init_completion(&csrow->kobj_complete);
A
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1163
			kobject_unregister(&mci->csrows[i].kobj);
1164 1165
			wait_for_completion(&csrow->kobj_complete);
		}
A
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1166 1167
	}

1168
fail0:
1169
	init_completion(&mci->kobj_complete);
A
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1170
	kobject_unregister(edac_mci_kobj);
1171
	wait_for_completion(&mci->kobj_complete);
A
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1172 1173
	return err;
}
1174
#endif  /* DISABLE_EDAC_SYSFS */
A
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/*
 * remove a Memory Controller instance
 */
static void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
{
1181
#ifndef DISABLE_EDAC_SYSFS
A
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1182 1183
	int i;

D
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1184
	debugf0("%s()\n", __func__);
A
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	/* remove all csrow kobjects */
	for (i = 0; i < mci->nr_csrows; i++) {
1188 1189
		if (mci->csrows[i].nr_pages > 0) {
			init_completion(&mci->csrows[i].kobj_complete);
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			kobject_unregister(&mci->csrows[i].kobj);
1191 1192
			wait_for_completion(&mci->csrows[i].kobj_complete);
		}
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	}

	sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);
1196
	init_completion(&mci->kobj_complete);
A
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	kobject_unregister(&mci->edac_mci_kobj);
1198
	wait_for_completion(&mci->kobj_complete);
1199
#endif  /* DISABLE_EDAC_SYSFS */
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}

/* END OF sysfs data and methods */

#ifdef CONFIG_EDAC_DEBUG

void edac_mc_dump_channel(struct channel_info *chan)
{
	debugf4("\tchannel = %p\n", chan);
	debugf4("\tchannel->chan_idx = %d\n", chan->chan_idx);
	debugf4("\tchannel->ce_count = %d\n", chan->ce_count);
	debugf4("\tchannel->label = '%s'\n", chan->label);
	debugf4("\tchannel->csrow = %p\n\n", chan->csrow);
}
1214
EXPORT_SYMBOL(edac_mc_dump_channel);
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void edac_mc_dump_csrow(struct csrow_info *csrow)
{
	debugf4("\tcsrow = %p\n", csrow);
	debugf4("\tcsrow->csrow_idx = %d\n", csrow->csrow_idx);
	debugf4("\tcsrow->first_page = 0x%lx\n",
		csrow->first_page);
	debugf4("\tcsrow->last_page = 0x%lx\n", csrow->last_page);
	debugf4("\tcsrow->page_mask = 0x%lx\n", csrow->page_mask);
	debugf4("\tcsrow->nr_pages = 0x%x\n", csrow->nr_pages);
	debugf4("\tcsrow->nr_channels = %d\n",
		csrow->nr_channels);
	debugf4("\tcsrow->channels = %p\n", csrow->channels);
	debugf4("\tcsrow->mci = %p\n\n", csrow->mci);
}
1230
EXPORT_SYMBOL(edac_mc_dump_csrow);
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1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245

void edac_mc_dump_mci(struct mem_ctl_info *mci)
{
	debugf3("\tmci = %p\n", mci);
	debugf3("\tmci->mtype_cap = %lx\n", mci->mtype_cap);
	debugf3("\tmci->edac_ctl_cap = %lx\n", mci->edac_ctl_cap);
	debugf3("\tmci->edac_cap = %lx\n", mci->edac_cap);
	debugf4("\tmci->edac_check = %p\n", mci->edac_check);
	debugf3("\tmci->nr_csrows = %d, csrows = %p\n",
		mci->nr_csrows, mci->csrows);
	debugf3("\tpdev = %p\n", mci->pdev);
	debugf3("\tmod_name:ctl_name = %s:%s\n",
		mci->mod_name, mci->ctl_name);
	debugf3("\tpvt_info = %p\n\n", mci->pvt_info);
}
1246
EXPORT_SYMBOL(edac_mc_dump_mci);
A
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1247

D
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1248
#endif  /* CONFIG_EDAC_DEBUG */
A
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1249 1250 1251 1252 1253 1254 1255 1256

/* 'ptr' points to a possibly unaligned item X such that sizeof(X) is 'size'.
 * Adjust 'ptr' so that its alignment is at least as stringent as what the
 * compiler would provide for X and return the aligned result.
 *
 * If 'size' is a constant, the compiler will optimize this whole function
 * down to either a no-op or the addition of a constant to the value of 'ptr'.
 */
D
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1257
static inline char * align_ptr(void *ptr, unsigned size)
A
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1258 1259 1260 1261 1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300
{
	unsigned align, r;

	/* Here we assume that the alignment of a "long long" is the most
	 * stringent alignment that the compiler will ever provide by default.
	 * As far as I know, this is a reasonable assumption.
	 */
	if (size > sizeof(long))
		align = sizeof(long long);
	else if (size > sizeof(int))
		align = sizeof(long);
	else if (size > sizeof(short))
		align = sizeof(int);
	else if (size > sizeof(char))
		align = sizeof(short);
	else
		return (char *) ptr;

	r = size % align;

	if (r == 0)
		return (char *) ptr;

	return (char *) (((unsigned long) ptr) + align - r);
}

/**
 * edac_mc_alloc: Allocate a struct mem_ctl_info structure
 * @size_pvt:	size of private storage needed
 * @nr_csrows:	Number of CWROWS needed for this MC
 * @nr_chans:	Number of channels for the MC
 *
 * Everything is kmalloc'ed as one big chunk - more efficient.
 * Only can be used if all structures have the same lifetime - otherwise
 * you have to allocate and initialize your own structures.
 *
 * Use edac_mc_free() to free mc structures allocated by this function.
 *
 * Returns:
 *	NULL allocation failed
 *	struct mem_ctl_info pointer
 */
struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt, unsigned nr_csrows,
D
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1301
		unsigned nr_chans)
A
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1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331
{
	struct mem_ctl_info *mci;
	struct csrow_info *csi, *csrow;
	struct channel_info *chi, *chp, *chan;
	void *pvt;
	unsigned size;
	int row, chn;

	/* Figure out the offsets of the various items from the start of an mc
	 * structure.  We want the alignment of each item to be at least as
	 * stringent as what the compiler would provide if we could simply
	 * hardcode everything into a single struct.
	 */
	mci = (struct mem_ctl_info *) 0;
	csi = (struct csrow_info *)align_ptr(&mci[1], sizeof(*csi));
	chi = (struct channel_info *)
			align_ptr(&csi[nr_csrows], sizeof(*chi));
	pvt = align_ptr(&chi[nr_chans * nr_csrows], sz_pvt);
	size = ((unsigned long) pvt) + sz_pvt;

	if ((mci = kmalloc(size, GFP_KERNEL)) == NULL)
		return NULL;

	/* Adjust pointers so they point within the memory we just allocated
	 * rather than an imaginary chunk of memory located at address 0.
	 */
	csi = (struct csrow_info *) (((char *) mci) + ((unsigned long) csi));
	chi = (struct channel_info *) (((char *) mci) + ((unsigned long) chi));
	pvt = sz_pvt ? (((char *) mci) + ((unsigned long) pvt)) : NULL;

D
Dave Peterson 已提交
1332
	memset(mci, 0, size);  /* clear all fields */
A
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1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353
	mci->csrows = csi;
	mci->pvt_info = pvt;
	mci->nr_csrows = nr_csrows;

	for (row = 0; row < nr_csrows; row++) {
		csrow = &csi[row];
		csrow->csrow_idx = row;
		csrow->mci = mci;
		csrow->nr_channels = nr_chans;
		chp = &chi[row * nr_chans];
		csrow->channels = chp;

		for (chn = 0; chn < nr_chans; chn++) {
			chan = &chp[chn];
			chan->chan_idx = chn;
			chan->csrow = csrow;
		}
	}

	return mci;
}
1354
EXPORT_SYMBOL(edac_mc_alloc);
A
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1355 1356 1357 1358 1359 1360 1361

/**
 * edac_mc_free:  Free a previously allocated 'mci' structure
 * @mci: pointer to a struct mem_ctl_info structure
 */
void edac_mc_free(struct mem_ctl_info *mci)
{
1362
	kfree(mci);
A
Alan Cox 已提交
1363
}
1364
EXPORT_SYMBOL(edac_mc_free);
A
Alan Cox 已提交
1365

1366
static struct mem_ctl_info *find_mci_by_pdev(struct pci_dev *pdev)
A
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1367 1368 1369 1370
{
	struct mem_ctl_info *mci;
	struct list_head *item;

D
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1371
	debugf3("%s()\n", __func__);
A
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1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382

	list_for_each(item, &mc_devices) {
		mci = list_entry(item, struct mem_ctl_info, link);

		if (mci->pdev == pdev)
			return mci;
	}

	return NULL;
}

D
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1383
static int add_mc_to_global_list(struct mem_ctl_info *mci)
A
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1384 1385 1386 1387 1388 1389 1390 1391 1392
{
	struct list_head *item, *insert_before;
	struct mem_ctl_info *p;
	int i;

	if (list_empty(&mc_devices)) {
		mci->mc_idx = 0;
		insert_before = &mc_devices;
	} else {
1393
		if (find_mci_by_pdev(mci->pdev)) {
D
Dave Peterson 已提交
1394 1395 1396 1397 1398
			edac_printk(KERN_WARNING, EDAC_MC,
				"%s (%s) %s %s already assigned %d\n",
				mci->pdev->dev.bus_id,
				pci_name(mci->pdev), mci->mod_name,
				mci->ctl_name, mci->mc_idx);
A
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1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425
			return 1;
		}

		insert_before = NULL;
		i = 0;

		list_for_each(item, &mc_devices) {
			p = list_entry(item, struct mem_ctl_info, link);

			if (p->mc_idx != i) {
				insert_before = item;
				break;
			}

			i++;
		}

		mci->mc_idx = i;

		if (insert_before == NULL)
			insert_before = &mc_devices;
	}

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

D
Dave Peterson 已提交
1426
static void complete_mc_list_del(struct rcu_head *head)
1427 1428 1429 1430 1431 1432 1433 1434
{
	struct mem_ctl_info *mci;

	mci = container_of(head, struct mem_ctl_info, rcu);
	INIT_LIST_HEAD(&mci->link);
	complete(&mci->complete);
}

D
Dave Peterson 已提交
1435
static void del_mc_from_global_list(struct mem_ctl_info *mci)
1436 1437 1438 1439 1440 1441 1442
{
	list_del_rcu(&mci->link);
	init_completion(&mci->complete);
	call_rcu(&mci->rcu, complete_mc_list_del);
	wait_for_completion(&mci->complete);
}

A
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1443
/**
1444 1445
 * edac_mc_add_mc: Insert the 'mci' structure into the mci global list and
 *                 create sysfs entries associated with mci structure
A
Alan Cox 已提交
1446 1447 1448 1449 1450 1451 1452 1453 1454 1455
 * @mci: pointer to the mci structure to be added to the list
 *
 * Return:
 *	0	Success
 *	!0	Failure
 */

/* FIXME - should a warning be printed if no error detection? correction? */
int edac_mc_add_mc(struct mem_ctl_info *mci)
{
D
Dave Peterson 已提交
1456
	debugf0("%s()\n", __func__);
A
Alan Cox 已提交
1457 1458 1459
#ifdef CONFIG_EDAC_DEBUG
	if (edac_debug_level >= 3)
		edac_mc_dump_mci(mci);
D
Dave Peterson 已提交
1460

A
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1461 1462 1463 1464 1465
	if (edac_debug_level >= 4) {
		int i;

		for (i = 0; i < mci->nr_csrows; i++) {
			int j;
D
Dave Peterson 已提交
1466

A
Alan Cox 已提交
1467 1468
			edac_mc_dump_csrow(&mci->csrows[i]);
			for (j = 0; j < mci->csrows[i].nr_channels; j++)
D
Dave Peterson 已提交
1469 1470
				edac_mc_dump_channel(
					&mci->csrows[i].channels[j]);
A
Alan Cox 已提交
1471 1472 1473 1474 1475 1476
		}
	}
#endif
	down(&mem_ctls_mutex);

	if (add_mc_to_global_list(mci))
1477
		goto fail0;
A
Alan Cox 已提交
1478 1479 1480 1481 1482

	/* set load time so that error rate can be tracked */
	mci->start_time = jiffies;

        if (edac_create_sysfs_mci_device(mci)) {
D
Dave Peterson 已提交
1483 1484
                edac_mc_printk(mci, KERN_WARNING,
			"failed to create sysfs device\n");
1485
                goto fail1;
A
Alan Cox 已提交
1486 1487 1488
        }

	/* Report action taken */
D
Dave Peterson 已提交
1489 1490
	edac_mc_printk(mci, KERN_INFO, "Giving out device to %s %s: PCI %s\n",
		mci->mod_name, mci->ctl_name, pci_name(mci->pdev));
A
Alan Cox 已提交
1491

1492 1493
	up(&mem_ctls_mutex);
	return 0;
A
Alan Cox 已提交
1494

1495 1496 1497 1498
fail1:
	del_mc_from_global_list(mci);

fail0:
A
Alan Cox 已提交
1499
	up(&mem_ctls_mutex);
1500
	return 1;
A
Alan Cox 已提交
1501
}
1502
EXPORT_SYMBOL(edac_mc_add_mc);
A
Alan Cox 已提交
1503 1504

/**
1505 1506
 * edac_mc_del_mc: Remove sysfs entries for specified mci structure and
 *                 remove mci structure from global list
1507
 * @pdev: Pointer to 'struct pci_dev' representing mci structure to remove.
A
Alan Cox 已提交
1508
 *
1509
 * Return pointer to removed mci structure, or NULL if device not found.
A
Alan Cox 已提交
1510
 */
1511
struct mem_ctl_info * edac_mc_del_mc(struct pci_dev *pdev)
A
Alan Cox 已提交
1512
{
1513
	struct mem_ctl_info *mci;
A
Alan Cox 已提交
1514

1515
	debugf0("MC: %s()\n", __func__);
A
Alan Cox 已提交
1516
	down(&mem_ctls_mutex);
1517 1518 1519 1520 1521 1522 1523

	if ((mci = find_mci_by_pdev(pdev)) == NULL) {
		up(&mem_ctls_mutex);
		return NULL;
	}

	edac_remove_sysfs_mci_device(mci);
A
Alan Cox 已提交
1524
	del_mc_from_global_list(mci);
1525
	up(&mem_ctls_mutex);
D
Dave Peterson 已提交
1526 1527 1528
	edac_printk(KERN_INFO, EDAC_MC,
		"Removed device %d for %s %s: PCI %s\n", mci->mc_idx,
		mci->mod_name, mci->ctl_name, pci_name(mci->pdev));
1529
	return mci;
A
Alan Cox 已提交
1530
}
1531
EXPORT_SYMBOL(edac_mc_del_mc);
A
Alan Cox 已提交
1532

D
Dave Peterson 已提交
1533
void edac_mc_scrub_block(unsigned long page, unsigned long offset, u32 size)
A
Alan Cox 已提交
1534 1535 1536 1537 1538
{
	struct page *pg;
	void *virt_addr;
	unsigned long flags = 0;

D
Dave Peterson 已提交
1539
	debugf3("%s()\n", __func__);
A
Alan Cox 已提交
1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561

	/* ECC error page was not in our memory. Ignore it. */
	if(!pfn_valid(page))
		return;

	/* Find the actual page structure then map it and fix */
	pg = pfn_to_page(page);

	if (PageHighMem(pg))
		local_irq_save(flags);

	virt_addr = kmap_atomic(pg, KM_BOUNCE_READ);

	/* Perform architecture specific atomic scrub operation */
	atomic_scrub(virt_addr + offset, size);

	/* Unmap and complete */
	kunmap_atomic(virt_addr, KM_BOUNCE_READ);

	if (PageHighMem(pg))
		local_irq_restore(flags);
}
1562
EXPORT_SYMBOL(edac_mc_scrub_block);
A
Alan Cox 已提交
1563 1564

/* FIXME - should return -1 */
D
Dave Peterson 已提交
1565
int edac_mc_find_csrow_by_page(struct mem_ctl_info *mci, unsigned long page)
A
Alan Cox 已提交
1566 1567 1568 1569
{
	struct csrow_info *csrows = mci->csrows;
	int row, i;

D
Dave Peterson 已提交
1570
	debugf1("MC%d: %s(): 0x%lx\n", mci->mc_idx, __func__, page);
A
Alan Cox 已提交
1571 1572 1573 1574 1575 1576 1577 1578
	row = -1;

	for (i = 0; i < mci->nr_csrows; i++) {
		struct csrow_info *csrow = &csrows[i];

		if (csrow->nr_pages == 0)
			continue;

D
Dave Peterson 已提交
1579 1580 1581 1582
		debugf3("MC%d: %s(): first(0x%lx) page(0x%lx) last(0x%lx) "
			"mask(0x%lx)\n", mci->mc_idx, __func__,
			csrow->first_page, page, csrow->last_page,
			csrow->page_mask);
A
Alan Cox 已提交
1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593

		if ((page >= csrow->first_page) &&
		    (page <= csrow->last_page) &&
		    ((page & csrow->page_mask) ==
		     (csrow->first_page & csrow->page_mask))) {
			row = i;
			break;
		}
	}

	if (row == -1)
D
Dave Peterson 已提交
1594 1595 1596
		edac_mc_printk(mci, KERN_ERR,
			"could not look up page error address %lx\n",
			(unsigned long) page);
A
Alan Cox 已提交
1597 1598 1599

	return row;
}
1600
EXPORT_SYMBOL(edac_mc_find_csrow_by_page);
A
Alan Cox 已提交
1601 1602 1603 1604

/* FIXME - setable log (warning/emerg) levels */
/* FIXME - integrate with evlog: http://evlog.sourceforge.net/ */
void edac_mc_handle_ce(struct mem_ctl_info *mci,
D
Dave Peterson 已提交
1605 1606
		unsigned long page_frame_number, unsigned long offset_in_page,
		unsigned long syndrome, int row, int channel, const char *msg)
A
Alan Cox 已提交
1607 1608 1609
{
	unsigned long remapped_page;

D
Dave Peterson 已提交
1610
	debugf3("MC%d: %s()\n", mci->mc_idx, __func__);
A
Alan Cox 已提交
1611 1612 1613 1614

	/* FIXME - maybe make panic on INTERNAL ERROR an option */
	if (row >= mci->nr_csrows || row < 0) {
		/* something is wrong */
D
Dave Peterson 已提交
1615 1616 1617
		edac_mc_printk(mci, KERN_ERR,
			"INTERNAL ERROR: row out of range "
			"(%d >= %d)\n", row, mci->nr_csrows);
A
Alan Cox 已提交
1618 1619 1620
		edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR");
		return;
	}
D
Dave Peterson 已提交
1621

A
Alan Cox 已提交
1622 1623
	if (channel >= mci->csrows[row].nr_channels || channel < 0) {
		/* something is wrong */
D
Dave Peterson 已提交
1624 1625 1626 1627
		edac_mc_printk(mci, KERN_ERR,
			"INTERNAL ERROR: channel out of range "
			"(%d >= %d)\n", channel,
			mci->csrows[row].nr_channels);
A
Alan Cox 已提交
1628 1629 1630 1631 1632 1633
		edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR");
		return;
	}

	if (log_ce)
		/* FIXME - put in DIMM location */
D
Dave Peterson 已提交
1634 1635 1636 1637 1638 1639
		edac_mc_printk(mci, KERN_WARNING,
			"CE page 0x%lx, offset 0x%lx, grain %d, syndrome "
			"0x%lx, row %d, channel %d, label \"%s\": %s\n",
			page_frame_number, offset_in_page,
			mci->csrows[row].grain, syndrome, row, channel,
			mci->csrows[row].channels[channel].label, msg);
A
Alan Cox 已提交
1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659

	mci->ce_count++;
	mci->csrows[row].ce_count++;
	mci->csrows[row].channels[channel].ce_count++;

	if (mci->scrub_mode & SCRUB_SW_SRC) {
		/*
		 * Some MC's can remap memory so that it is still available
		 * at a different address when PCI devices map into memory.
		 * MC's that can't do this lose the memory where PCI devices
		 * are mapped.  This mapping is MC dependant and so we call
		 * back into the MC driver for it to map the MC page to
		 * a physical (CPU) page which can then be mapped to a virtual
		 * page - which can then be scrubbed.
		 */
		remapped_page = mci->ctl_page_to_phys ?
		    mci->ctl_page_to_phys(mci, page_frame_number) :
		    page_frame_number;

		edac_mc_scrub_block(remapped_page, offset_in_page,
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					mci->csrows[row].grain);
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	}
}
1663
EXPORT_SYMBOL(edac_mc_handle_ce);
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void edac_mc_handle_ce_no_info(struct mem_ctl_info *mci, const char *msg)
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{
	if (log_ce)
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		edac_mc_printk(mci, KERN_WARNING,
			"CE - no information available: %s\n", msg);
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	mci->ce_noinfo_count++;
	mci->ce_count++;
}
1674
EXPORT_SYMBOL(edac_mc_handle_ce_no_info);
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void edac_mc_handle_ue(struct mem_ctl_info *mci,
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		unsigned long page_frame_number, unsigned long offset_in_page,
		int row, const char *msg)
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{
	int len = EDAC_MC_LABEL_LEN * 4;
	char labels[len + 1];
	char *pos = labels;
	int chan;
	int chars;

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	debugf3("MC%d: %s()\n", mci->mc_idx, __func__);
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	/* FIXME - maybe make panic on INTERNAL ERROR an option */
	if (row >= mci->nr_csrows || row < 0) {
		/* something is wrong */
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		edac_mc_printk(mci, KERN_ERR,
			"INTERNAL ERROR: row out of range "
			"(%d >= %d)\n", row, mci->nr_csrows);
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		edac_mc_handle_ue_no_info(mci, "INTERNAL ERROR");
		return;
	}

	chars = snprintf(pos, len + 1, "%s",
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			mci->csrows[row].channels[0].label);
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	len -= chars;
	pos += chars;
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	for (chan = 1; (chan < mci->csrows[row].nr_channels) && (len > 0);
	     chan++) {
		chars = snprintf(pos, len + 1, ":%s",
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				mci->csrows[row].channels[chan].label);
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		len -= chars;
		pos += chars;
	}

	if (log_ue)
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		edac_mc_printk(mci, KERN_EMERG,
			"UE page 0x%lx, offset 0x%lx, grain %d, row %d, "
			"labels \"%s\": %s\n", page_frame_number,
			offset_in_page, mci->csrows[row].grain, row, labels,
			msg);
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	if (panic_on_ue)
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		panic("EDAC MC%d: UE page 0x%lx, offset 0x%lx, grain %d, "
			"row %d, labels \"%s\": %s\n", mci->mc_idx,
			page_frame_number, offset_in_page,
			mci->csrows[row].grain, row, labels, msg);
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	mci->ue_count++;
	mci->csrows[row].ue_count++;
}
1727
EXPORT_SYMBOL(edac_mc_handle_ue);
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void edac_mc_handle_ue_no_info(struct mem_ctl_info *mci, const char *msg)
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{
	if (panic_on_ue)
		panic("EDAC MC%d: Uncorrected Error", mci->mc_idx);

	if (log_ue)
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		edac_mc_printk(mci, KERN_WARNING,
			"UE - no information available: %s\n", msg);
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	mci->ue_noinfo_count++;
	mci->ue_count++;
}
1740
EXPORT_SYMBOL(edac_mc_handle_ue_no_info);
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#ifdef CONFIG_PCI

static u16 get_pci_parity_status(struct pci_dev *dev, int secondary)
{
	int where;
	u16 status;

	where = secondary ? PCI_SEC_STATUS : PCI_STATUS;
	pci_read_config_word(dev, where, &status);

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	/* If we get back 0xFFFF then we must suspect that the card has been
	 * pulled but the Linux PCI layer has not yet finished cleaning up.
	 * We don't want to report on such devices
	 */
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	if (status == 0xFFFF) {
		u32 sanity;
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		pci_read_config_dword(dev, 0, &sanity);
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		if (sanity == 0xFFFFFFFF)
			return 0;
	}
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	status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR |
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		PCI_STATUS_PARITY;
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	if (status)
		/* reset only the bits we are interested in */
		pci_write_config_word(dev, where, status);

	return status;
}

typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev);

/* Clear any PCI parity errors logged by this device. */
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static void edac_pci_dev_parity_clear(struct pci_dev *dev)
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{
	u8 header_type;

	get_pci_parity_status(dev, 0);

	/* read the device TYPE, looking for bridges */
	pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);

	if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE)
		get_pci_parity_status(dev, 1);
}

/*
 *  PCI Parity polling
 *
 */
static void edac_pci_dev_parity_test(struct pci_dev *dev)
{
	u16 status;
	u8  header_type;

	/* read the STATUS register on this device
	 */
	status = get_pci_parity_status(dev, 0);

	debugf2("PCI STATUS= 0x%04x %s\n", status, dev->dev.bus_id );

	/* check the status reg for errors */
	if (status) {
		if (status & (PCI_STATUS_SIG_SYSTEM_ERROR))
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			edac_printk(KERN_CRIT, EDAC_PCI,
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				"Signaled System Error on %s\n",
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				pci_name(dev));
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		if (status & (PCI_STATUS_PARITY)) {
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			edac_printk(KERN_CRIT, EDAC_PCI,
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				"Master Data Parity Error on %s\n",
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				pci_name(dev));
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			atomic_inc(&pci_parity_count);
		}

		if (status & (PCI_STATUS_DETECTED_PARITY)) {
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			edac_printk(KERN_CRIT, EDAC_PCI,
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				"Detected Parity Error on %s\n",
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				pci_name(dev));
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			atomic_inc(&pci_parity_count);
		}
	}

	/* read the device TYPE, looking for bridges */
	pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);

	debugf2("PCI HEADER TYPE= 0x%02x %s\n", header_type, dev->dev.bus_id );

	if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
		/* On bridges, need to examine secondary status register  */
		status = get_pci_parity_status(dev, 1);

		debugf2("PCI SEC_STATUS= 0x%04x %s\n",
				status, dev->dev.bus_id );

		/* check the secondary status reg for errors */
		if (status) {
			if (status & (PCI_STATUS_SIG_SYSTEM_ERROR))
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				edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
A
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					"Signaled System Error on %s\n",
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					pci_name(dev));
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			if (status & (PCI_STATUS_PARITY)) {
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				edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
					"Master Data Parity Error on "
					"%s\n", pci_name(dev));
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				atomic_inc(&pci_parity_count);
			}

			if (status & (PCI_STATUS_DETECTED_PARITY)) {
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				edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
A
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					"Detected Parity Error on %s\n",
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					pci_name(dev));
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				atomic_inc(&pci_parity_count);
			}
		}
	}
}

/*
 * check_dev_on_list: Scan for a PCI device on a white/black list
 * @list:	an EDAC  &edac_pci_device_list  white/black list pointer
 * @free_index:	index of next free entry on the list
 * @pci_dev:	PCI Device pointer
 *
 * see if list contains the device.
 *
 * Returns:  	0 not found
 *		1 found on list
 */
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static int check_dev_on_list(struct edac_pci_device_list *list,
		int free_index, struct pci_dev *dev)
{
	int i;
	int rc = 0;     /* Assume not found */
	unsigned short vendor=dev->vendor;
	unsigned short device=dev->device;

	/* Scan the list, looking for a vendor/device match */
	for (i = 0; i < free_index; i++, list++ ) {
		if ((list->vendor == vendor ) && (list->device == device )) {
			rc = 1;
			break;
		}
	}
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	return rc;
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}

/*
 * pci_dev parity list iterator
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 *	Scan the PCI device list for one iteration, looking for SERRORs
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 *	Master Parity ERRORS or Parity ERRORs on primary or secondary devices
 */
static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn)
{
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	struct pci_dev *dev = NULL;
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	/* request for kernel access to the next PCI device, if any,
	 * and while we are looking at it have its reference count
	 * bumped until we are done with it
	 */
	while((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
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		/* if whitelist exists then it has priority, so only scan
		 * those devices on the whitelist
		 */
		if (pci_whitelist_count > 0 ) {
			if (check_dev_on_list(pci_whitelist,
A
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					pci_whitelist_count, dev))
				fn(dev);
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		} else {
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			/*
			 * if no whitelist, then check if this devices is
			 * blacklisted
			 */
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1925
			if (!check_dev_on_list(pci_blacklist,
A
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1926 1927
					pci_blacklist_count, dev))
				fn(dev);
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		}
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1929 1930 1931 1932 1933 1934 1935 1936
	}
}

static void do_pci_parity_check(void)
{
	unsigned long flags;
	int before_count;

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	debugf3("%s()\n", __func__);
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	if (!check_pci_parity)
		return;

	before_count = atomic_read(&pci_parity_count);

	/* scan all PCI devices looking for a Parity Error on devices and
	 * bridges
	 */
	local_irq_save(flags);
	edac_pci_dev_parity_iterator(edac_pci_dev_parity_test);
	local_irq_restore(flags);

	/* Only if operator has selected panic on PCI Error */
	if (panic_on_pci_parity) {
		/* If the count is different 'after' from 'before' */
		if (before_count != atomic_read(&pci_parity_count))
			panic("EDAC: PCI Parity Error");
	}
}

static inline void clear_pci_parity_errors(void)
{
	/* Clear any PCI bus parity errors that devices initially have logged
	 * in their registers.
	 */
	edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear);
}

#else  /* CONFIG_PCI */

static inline void do_pci_parity_check(void)
{
	/* no-op */
}

static inline void clear_pci_parity_errors(void)
{
	/* no-op */
}

#endif  /* CONFIG_PCI */

/*
 * Iterate over all MC instances and check for ECC, et al, errors
 */
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static inline void check_mc_devices(void)
A
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{
	struct list_head *item;
	struct mem_ctl_info *mci;

D
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	debugf3("%s()\n", __func__);
1990
	down(&mem_ctls_mutex);
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	list_for_each(item, &mc_devices) {
		mci = list_entry(item, struct mem_ctl_info, link);

		if (mci->edac_check != NULL)
			mci->edac_check(mci);
	}

1999
	up(&mem_ctls_mutex);
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}

/*
 * Check MC status every poll_msec.
 * Check PCI status every poll_msec as well.
 *
 * This where the work gets done for edac.
 *
 * SMP safe, doesn't use NMI, and auto-rate-limits.
 */
static void do_edac_check(void)
{
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	debugf3("%s()\n", __func__);
A
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2013 2014 2015 2016 2017 2018
	check_mc_devices();
	do_pci_parity_check();
}

static int edac_kernel_thread(void *arg)
{
2019 2020
	while (!kthread_should_stop()) {
		do_edac_check();
A
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2021 2022

		/* goto sleep for the interval */
2023
		schedule_timeout_interruptible((HZ * poll_msec) / 1000);
A
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2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035
		try_to_freeze();
	}

	return 0;
}

/*
 * edac_mc_init
 *      module initialization entry point
 */
static int __init edac_mc_init(void)
{
D
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2036
	edac_printk(KERN_INFO, EDAC_MC, EDAC_MC_VERSION "\n");
A
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2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048

	/*
	 * Harvest and clear any boot/initialization PCI parity errors
	 *
	 * FIXME: This only clears errors logged by devices present at time of
	 * 	module initialization.  We should also do an initial clear
	 *	of each newly hotplugged device.
	 */
	clear_pci_parity_errors();

	/* Create the MC sysfs entires */
	if (edac_sysfs_memctrl_setup()) {
D
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		edac_printk(KERN_ERR, EDAC_MC,
			"Error initializing sysfs code\n");
A
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2051 2052 2053 2054 2055 2056
		return -ENODEV;
	}

	/* Create the PCI parity sysfs entries */
	if (edac_sysfs_pci_setup()) {
		edac_sysfs_memctrl_teardown();
D
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2057 2058
		edac_printk(KERN_ERR, EDAC_MC,
			"EDAC PCI: Error initializing sysfs code\n");
A
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2059 2060 2061 2062
		return -ENODEV;
	}

	/* create our kernel thread */
2063
	edac_thread = kthread_run(edac_kernel_thread, NULL, "kedac");
D
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2064

2065
	if (IS_ERR(edac_thread)) {
A
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2066 2067 2068
		/* remove the sysfs entries */
		edac_sysfs_memctrl_teardown();
		edac_sysfs_pci_teardown();
2069
		return PTR_ERR(edac_thread);
A
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	}

	return 0;
}

/*
 * edac_mc_exit()
 *      module exit/termination functioni
 */
static void __exit edac_mc_exit(void)
{
D
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2081
	debugf0("%s()\n", __func__);
2082
	kthread_stop(edac_thread);
A
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        /* tear down the sysfs device */
	edac_sysfs_memctrl_teardown();
	edac_sysfs_pci_teardown();
}

module_init(edac_mc_init);
module_exit(edac_mc_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh et al\n"
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	"Based on work by Dan Hollis et al");
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MODULE_DESCRIPTION("Core library routines for MC reporting");

module_param(panic_on_ue, int, 0644);
MODULE_PARM_DESC(panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
module_param(check_pci_parity, int, 0644);
MODULE_PARM_DESC(check_pci_parity, "Check for PCI bus parity errors: 0=off 1=on");
module_param(panic_on_pci_parity, int, 0644);
MODULE_PARM_DESC(panic_on_pci_parity, "Panic on PCI Bus Parity error: 0=off 1=on");
module_param(log_ue, int, 0644);
MODULE_PARM_DESC(log_ue, "Log uncorrectable error to console: 0=off 1=on");
module_param(log_ce, int, 0644);
MODULE_PARM_DESC(log_ce, "Log correctable error to console: 0=off 1=on");
module_param(poll_msec, int, 0644);
MODULE_PARM_DESC(poll_msec, "Polling period in milliseconds");
#ifdef CONFIG_EDAC_DEBUG
module_param(edac_debug_level, int, 0644);
MODULE_PARM_DESC(edac_debug_level, "Debug level");
#endif