diff options
Diffstat (limited to 'drivers/edac/edac_mc.c')
| -rw-r--r-- | drivers/edac/edac_mc.c | 2209 |
1 files changed, 2209 insertions, 0 deletions
diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c new file mode 100644 index 000000000000..4be9bd0a1267 --- /dev/null +++ b/drivers/edac/edac_mc.c @@ -0,0 +1,2209 @@ +/* + * 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/version.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> + +#include <asm/uaccess.h> +#include <asm/page.h> +#include <asm/edac.h> + +#include "edac_mc.h" + +#define EDAC_MC_VERSION "edac_mc Ver: 2.0.0 " __DATE__ + +#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; +static int panic_on_ue = 1; +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); + +/* 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 */ + +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; + +/* + * /sys/devices/system/edac/mc; + * data structures and methods + */ +static ssize_t memctrl_string_show(void *ptr, char *buffer) +{ + char *value = (char*) ptr; + return sprintf(buffer, "%s\n", value); +} + +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 { + struct attribute attr; + void *value; + ssize_t (*show)(void *,char *); + ssize_t (*store)(void *, const char *, size_t); +}; + +/* Set of show/store abstract level functions for memory control object */ +static ssize_t +memctrl_dev_show(struct kobject *kobj, struct attribute *attr, char *buffer) +{ + 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); + return -EIO; +} + +static ssize_t +memctrl_dev_store(struct kobject *kobj, struct attribute *attr, + const char *buffer, size_t count) +{ + 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); + 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*/ +MEMCTRL_STRING_ATTR(mc_version,EDAC_MC_VERSION,S_IRUGO,memctrl_string_show,NULL); + +/* 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, + &attr_mc_version, + NULL, +}; + +/* Main MC kobject release() function */ +static void edac_memctrl_master_release(struct kobject *kobj) +{ + debugf1("EDAC MC: " __FILE__ ": %s()\n", __func__); +} + +static struct kobj_type ktype_memctrl = { + .release = edac_memctrl_master_release, + .sysfs_ops = &memctrlfs_ops, + .default_attrs = (struct attribute **) memctrl_attr, +}; + + +/* 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) +{ + int err=0; + + debugf1("MC: " __FILE__ ": %s()\n", __func__); + + /* create the /sys/devices/system/edac directory */ + err = sysdev_class_register(&edac_class); + if (!err) { + /* Init the MC's kobject */ + memset(&edac_memctrl_kobj, 0, sizeof (edac_memctrl_kobj)); + kobject_init(&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"); + if (!err) { + /* FIXME: maybe new sysdev_create_subdir() */ + err = kobject_register(&edac_memctrl_kobj); + if (err) { + debugf1("Failed to register '.../edac/mc'\n"); + } else { + debugf1("Registered '.../edac/mc' kobject\n"); + } + } + } else { + debugf1(KERN_WARNING "__FILE__ %s() error=%d\n", __func__,err); + } + + return err; +} + +/* + * MC teardown: + * the '..../edac/mc' kobject followed by '..../edac' itself + */ +static void edac_sysfs_memctrl_teardown(void) +{ + debugf0("MC: " __FILE__ ": %s()\n", __func__); + + /* Unregister the MC's kobject */ + kobject_unregister(&edac_memctrl_kobj); + + /* release the master edac mc kobject */ + kobject_put(&edac_memctrl_kobj); + + /* Unregister the 'edac' object */ + sysdev_class_unregister(&edac_class); +} + +/* + * /sys/devices/system/edac/pci; + * data structures and methods + */ + +struct list_control { + struct edac_pci_device_list *list; + int *count; +}; + +/* 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) { + (*s)++; /* keep *s moving */ + 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; + while (runner < *e) { + /* scan for vendor:device delimiter */ + if (*runner == ':') { + *vendor_id = simple_strtol((char*) *s, (char**) &p, 16); + runner = p + 1; + break; + } + 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, + size_t count) +{ + 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; + while (*index < MAX_LISTED_PCI_DEVICES) { + + 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; +} + +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 { + struct attribute attr; + void *value; + 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, + char *buffer) +{ + 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; +} + +static ssize_t edac_pci_dev_store(struct kobject *kobj, struct attribute *attr, + const char *buffer, size_t count) +{ + 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, \ +}; + +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); + +/* PCI Parity control files */ +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); + +/* 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, + &edac_pci_attr_pci_parity_whitelist, + &edac_pci_attr_pci_parity_blacklist, + NULL, +}; + +/* No memory to release */ +static void edac_pci_release(struct kobject *kobj) +{ + debugf1("EDAC PCI: " __FILE__ ": %s()\n", __func__); +} + +static struct kobj_type ktype_edac_pci = { + .release = edac_pci_release, + .sysfs_ops = &edac_pci_sysfs_ops, + .default_attrs = (struct attribute **) edac_pci_attr, +}; + +/** + * edac_sysfs_pci_setup() + * + */ +static int edac_sysfs_pci_setup(void) +{ + int err; + + debugf1("MC: " __FILE__ ": %s()\n", __func__); + + memset(&edac_pci_kobj, 0, sizeof(edac_pci_kobj)); + + kobject_init(&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"); + if (!err) { + /* Instanstiate the csrow object */ + /* FIXME: maybe new sysdev_create_subdir() */ + err = kobject_register(&edac_pci_kobj); + if (err) + debugf1("Failed to register '.../edac/pci'\n"); + else + debugf1("Registered '.../edac/pci' kobject\n"); + } + return err; +} + + +static void edac_sysfs_pci_teardown(void) +{ + debugf0("MC: " __FILE__ ": %s()\n", __func__); + + kobject_unregister(&edac_pci_kobj); + kobject_put(&edac_pci_kobj); +} + +/* 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); + } + 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); + } + return size; +} + +static ssize_t csrow_ch0_dimm_label_store(struct csrow_info *csrow, + const char *data, size_t size) +{ + 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'; + } + return size; +} + +static ssize_t csrow_ch1_dimm_label_store(struct csrow_info *csrow, + const char *data, size_t size) +{ + 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'; + } + 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); + } + 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); + } + 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 { + struct attribute attr; + 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, + char *buffer) +{ + 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); + return -EIO; +} + +static ssize_t csrowdev_store(struct kobject *kobj, struct attribute *attr, + const char *buffer, size_t count) +{ + 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); + 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) +{ + debugf1("EDAC MC: " __FILE__ ": %s()\n", __func__); +} + +static struct kobj_type ktype_csrow = { + .release = edac_csrow_instance_release, + .sysfs_ops = &csrowfs_ops, + .default_attrs = (struct attribute **) csrow_attr, +}; + +/* Create a CSROW object under specifed edac_mc_device */ +static int edac_create_csrow_object(struct kobject *edac_mci_kobj, + struct csrow_info *csrow, int index ) +{ + int err = 0; + + debugf0("MC: " __FILE__ ": %s()\n", __func__); + + memset(&csrow->kobj, 0, sizeof(csrow->kobj)); + + /* generate ..../edac/mc/mc<id>/csrow<index> */ + + kobject_init(&csrow->kobj); + 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); + if (!err) { + /* Instanstiate the csrow object */ + err = kobject_register(&csrow->kobj); + 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 */ + +static ssize_t mci_reset_counters_store(struct mem_ctl_info *mci, + const char *data, size_t count ) +{ + int row, chan; + + mci->ue_noinfo_count = 0; + mci->ce_noinfo_count = 0; + mci->ue_count = 0; + mci->ce_count = 0; + for (row = 0; row < mci->nr_csrows; row++) { + struct csrow_info *ri = &mci->csrows[row]; + + ri->ue_count = 0; + ri->ce_count = 0; + for (chan = 0; chan < ri->nr_channels; chan++) + ri->channels[chan].ce_count = 0; + } + mci->start_time = jiffies; + + 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, + char *data) +{ + 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; +} + +static ssize_t mci_supported_mem_type_show(struct mem_ctl_info *mci, char *data) +{ + 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; + total_pages += csrow->nr_pages; + } + + return sprintf(data,"%u\n", PAGES_TO_MiB(total_pages)); +} + +struct mcidev_attribute { + struct attribute attr; + 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, + char *buffer) +{ + 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); + return -EIO; +} + +static ssize_t mcidev_store(struct kobject *kobj, struct attribute *attr, + const char *buffer, size_t count) +{ + 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); + return -EIO; +} + +static struct sysfs_ops mci_ops = { + .show = mcidev_show, + .store = mcidev_store +}; + +#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; + mci = container_of(kobj,struct mem_ctl_info,edac_mci_kobj); + + debugf0("MC: " __FILE__ ": %s() idx=%d calling kfree\n", + __func__, mci->mc_idx); + + kfree(mci); +} + +static struct kobj_type ktype_mci = { + .release = edac_mci_instance_release, + .sysfs_ops = &mci_ops, + .default_attrs = (struct attribute **) mci_attr, +}; + +#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) +{ + int i; + int err; + struct csrow_info *csrow; + struct kobject *edac_mci_kobj=&mci->edac_mci_kobj; + + debugf0("MC: " __FILE__ ": %s() idx=%d\n", __func__, mci->mc_idx); + + memset(edac_mci_kobj, 0, sizeof(*edac_mci_kobj)); + kobject_init(edac_mci_kobj); + + /* set the name of the mc<id> object */ + err = kobject_set_name(edac_mci_kobj,"mc%d",mci->mc_idx); + 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); + if (err) + return err; + + /* create a symlink for the device */ + err = sysfs_create_link(edac_mci_kobj, &mci->pdev->dev.kobj, + EDAC_DEVICE_SYMLINK); + if (err) { + kobject_unregister(edac_mci_kobj); + return err; + } + + /* 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); + if (err) + goto fail; + } + } + + /* Mark this MCI instance as having sysfs entries */ + mci->sysfs_active = MCI_SYSFS_ACTIVE; + + return 0; + + + /* CSROW error: backout what has already been registered, */ +fail: + for ( i--; i >= 0; i--) { + if (csrow->nr_pages > 0) { + kobject_unregister(&mci->csrows[i].kobj); + kobject_put(&mci->csrows[i].kobj); + } + } + + kobject_unregister(edac_mci_kobj); + kobject_put(edac_mci_kobj); + + return err; +} + +/* + * remove a Memory Controller instance + */ +static void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci) +{ + int i; + + debugf0("MC: " __FILE__ ": %s()\n", __func__); + + /* remove all csrow kobjects */ + for (i = 0; i < mci->nr_csrows; i++) { + if (mci->csrows[i].nr_pages > 0) { + kobject_unregister(&mci->csrows[i].kobj); + kobject_put(&mci->csrows[i].kobj); + } + } + + sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK); + + kobject_unregister(&mci->edac_mci_kobj); + kobject_put(&mci->edac_mci_kobj); +} + +/* END OF sysfs data and methods */ + +#ifdef CONFIG_EDAC_DEBUG + +EXPORT_SYMBOL(edac_mc_dump_channel); + +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); +} + + +EXPORT_SYMBOL(edac_mc_dump_csrow); + +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); +} + + +EXPORT_SYMBOL(edac_mc_dump_mci); + +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); +} + + +#endif /* CONFIG_EDAC_DEBUG */ + +/* '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'. + */ +static inline char * align_ptr (void *ptr, unsigned size) +{ + 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); +} + + +EXPORT_SYMBOL(edac_mc_alloc); + +/** + * 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, + unsigned nr_chans) +{ + 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; + + memset(mci, 0, size); /* clear all fields */ + + 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; +} + + +EXPORT_SYMBOL(edac_mc_free); + +/** + * edac_mc_free: Free a previously allocated 'mci' structure + * @mci: pointer to a struct mem_ctl_info structure + * + * Free up a previously allocated mci structure + * A MCI structure can be in 2 states after being allocated + * by edac_mc_alloc(). + * 1) Allocated in a MC driver's probe, but not yet committed + * 2) Allocated and committed, by a call to edac_mc_add_mc() + * edac_mc_add_mc() is the function that adds the sysfs entries + * thus, this free function must determine which state the 'mci' + * structure is in, then either free it directly or + * perform kobject cleanup by calling edac_remove_sysfs_mci_device(). + * + * VOID Return + */ +void edac_mc_free(struct mem_ctl_info *mci) +{ + /* only if sysfs entries for this mci instance exist + * do we remove them and defer the actual kfree via + * the kobject 'release()' callback. + * + * Otherwise, do a straight kfree now. + */ + if (mci->sysfs_active == MCI_SYSFS_ACTIVE) + edac_remove_sysfs_mci_device(mci); + else + kfree(mci); +} + + + +EXPORT_SYMBOL(edac_mc_find_mci_by_pdev); + +struct mem_ctl_info *edac_mc_find_mci_by_pdev(struct pci_dev *pdev) +{ + struct mem_ctl_info *mci; + struct list_head *item; + + debugf3("MC: " __FILE__ ": %s()\n", __func__); + + list_for_each(item, &mc_devices) { + mci = list_entry(item, struct mem_ctl_info, link); + + if (mci->pdev == pdev) + return mci; + } + + return NULL; +} + +static int add_mc_to_global_list (struct mem_ctl_info *mci) +{ + 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 { + if (edac_mc_find_mci_by_pdev(mci->pdev)) { + 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); + 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; +} + + + +EXPORT_SYMBOL(edac_mc_add_mc); + +/** + * edac_mc_add_mc: Insert the 'mci' structure into the mci global list + * @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) +{ + int rc = 1; + + debugf0("MC: " __FILE__ ": %s()\n", __func__); +#ifdef CONFIG_EDAC_DEBUG + if (edac_debug_level >= 3) + edac_mc_dump_mci(mci); + if (edac_debug_level >= 4) { + int i; + + for (i = 0; i < mci->nr_csrows; i++) { + int j; + edac_mc_dump_csrow(&mci->csrows[i]); + for (j = 0; j < mci->csrows[i].nr_channels; j++) + edac_mc_dump_channel(&mci->csrows[i]. + channels[j]); + } + } +#endif + down(&mem_ctls_mutex); + + if (add_mc_to_global_list(mci)) + goto finish; + + /* set load time so that error rate can be tracked */ + mci->start_time = jiffies; + + if (edac_create_sysfs_mci_device(mci)) { + printk(KERN_WARNING + "EDAC MC%d: failed to create sysfs device\n", + mci->mc_idx); + /* FIXME - should there be an error code and unwind? */ + goto finish; + } + + /* Report action taken */ + printk(KERN_INFO + "EDAC MC%d: Giving out device to %s %s: PCI %s\n", + mci->mc_idx, mci->mod_name, mci->ctl_name, + pci_name(mci->pdev)); + + + rc = 0; + +finish: + up(&mem_ctls_mutex); + return rc; +} + + + +static void complete_mc_list_del (struct rcu_head *head) +{ + struct mem_ctl_info *mci; + + mci = container_of(head, struct mem_ctl_info, rcu); + INIT_LIST_HEAD(&mci->link); + complete(&mci->complete); +} + +static void del_mc_from_global_list (struct mem_ctl_info *mci) +{ + list_del_rcu(&mci->link); + init_completion(&mci->complete); + call_rcu(&mci->rcu, complete_mc_list_del); + wait_for_completion(&mci->complete); +} + +EXPORT_SYMBOL(edac_mc_del_mc); + +/** + * edac_mc_del_mc: Remove the specified mci structure from global list + * @mci: Pointer to struct mem_ctl_info structure + * + * Returns: + * 0 Success + * 1 Failure + */ +int edac_mc_del_mc(struct mem_ctl_info *mci) +{ + int rc = 1; + + debugf0("MC%d: " __FILE__ ": %s()\n", mci->mc_idx, __func__); + down(&mem_ctls_mutex); + del_mc_from_global_list(mci); + printk(KERN_INFO + "EDAC MC%d: Removed device %d for %s %s: PCI %s\n", + mci->mc_idx, mci->mc_idx, mci->mod_name, mci->ctl_name, + pci_name(mci->pdev)); + rc = 0; + up(&mem_ctls_mutex); + + return rc; +} + + +EXPORT_SYMBOL(edac_mc_scrub_block); + +void edac_mc_scrub_block(unsigned long page, unsigned long offset, + u32 size) +{ + struct page *pg; + void *virt_addr; + unsigned long flags = 0; + + debugf3("MC: " __FILE__ ": %s()\n", __func__); + + /* 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); +} + + +/* FIXME - should return -1 */ +EXPORT_SYMBOL(edac_mc_find_csrow_by_page); + +int edac_mc_find_csrow_by_page(struct mem_ctl_info *mci, + unsigned long page) +{ + struct csrow_info *csrows = mci->csrows; + int row, i; + + debugf1("MC%d: " __FILE__ ": %s(): 0x%lx\n", mci->mc_idx, __func__, + page); + row = -1; + + for (i = 0; i < mci->nr_csrows; i++) { + struct csrow_info *csrow = &csrows[i]; + + if (csrow->nr_pages == 0) + continue; + + debugf3("MC%d: " __FILE__ + ": %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); + + 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) + printk(KERN_ERR + "EDAC MC%d: could not look up page error address %lx\n", + mci->mc_idx, (unsigned long) page); + + return row; +} + + +EXPORT_SYMBOL(edac_mc_handle_ce); + +/* FIXME - setable log (warning/emerg) levels */ +/* FIXME - integrate with evlog: http://evlog.sourceforge.net/ */ +void edac_mc_handle_ce(struct mem_ctl_info *mci, + unsigned long page_frame_number, + unsigned long offset_in_page, + unsigned long syndrome, int row, int channel, + const char *msg) +{ + unsigned long remapped_page; + + debugf3("MC%d: " __FILE__ ": %s()\n", mci->mc_idx, __func__); + + /* FIXME - maybe make panic on INTERNAL ERROR an option */ + if (row >= mci->nr_csrows || row < 0) { + /* something is wrong */ + printk(KERN_ERR + "EDAC MC%d: INTERNAL ERROR: row out of range (%d >= %d)\n", + mci->mc_idx, row, mci->nr_csrows); + edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR"); + return; + } + if (channel >= mci->csrows[row].nr_channels || channel < 0) { + /* something is wrong */ + printk(KERN_ERR + "EDAC MC%d: INTERNAL ERROR: channel out of range " + "(%d >= %d)\n", + mci->mc_idx, channel, mci->csrows[row].nr_channels); + edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR"); + return; + } + + if (log_ce) + /* FIXME - put in DIMM location */ + printk(KERN_WARNING + "EDAC MC%d: CE page 0x%lx, offset 0x%lx," + " grain %d, syndrome 0x%lx, row %d, channel %d," + " label \"%s\": %s\n", mci->mc_idx, + page_frame_number, offset_in_page, + mci->csrows[row].grain, syndrome, row, channel, + mci->csrows[row].channels[channel].label, msg); + + 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, + mci->csrows[row].grain); + } +} + + +EXPORT_SYMBOL(edac_mc_handle_ce_no_info); + +void edac_mc_handle_ce_no_info(struct mem_ctl_info *mci, + const char *msg) +{ + if (log_ce) + printk(KERN_WARNING + "EDAC MC%d: CE - no information available: %s\n", + mci->mc_idx, msg); + mci->ce_noinfo_count++; + mci->ce_count++; +} + + +EXPORT_SYMBOL(edac_mc_handle_ue); + +void edac_mc_handle_ue(struct mem_ctl_info *mci, + unsigned long page_frame_number, + unsigned long offset_in_page, int row, + const char *msg) +{ + int len = EDAC_MC_LABEL_LEN * 4; + char labels[len + 1]; + char *pos = labels; + int chan; + int chars; + + debugf3("MC%d: " __FILE__ ": %s()\n", mci->mc_idx, __func__); + + /* FIXME - maybe make panic on INTERNAL ERROR an option */ + if (row >= mci->nr_csrows || row < 0) { + /* something is wrong */ + printk(KERN_ERR + "EDAC MC%d: INTERNAL ERROR: row out of range (%d >= %d)\n", + mci->mc_idx, row, mci->nr_csrows); + edac_mc_handle_ue_no_info(mci, "INTERNAL ERROR"); + return; + } + + chars = snprintf(pos, len + 1, "%s", + mci->csrows[row].channels[0].label); + len -= chars; + pos += chars; + for (chan = 1; (chan < mci->csrows[row].nr_channels) && (len > 0); + chan++) { + chars = snprintf(pos, len + 1, ":%s", + mci->csrows[row].channels[chan].label); + len -= chars; + pos += chars; + } + + if (log_ue) + printk(KERN_EMERG + "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); + + if (panic_on_ue) + 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); + + mci->ue_count++; + mci->csrows[row].ue_count++; +} + + +EXPORT_SYMBOL(edac_mc_handle_ue_no_info); + +void edac_mc_handle_ue_no_info(struct mem_ctl_info *mci, + const char *msg) +{ + if (panic_on_ue) + panic("EDAC MC%d: Uncorrected Error", mci->mc_idx); + + if (log_ue) + printk(KERN_WARNING + "EDAC MC%d: UE - no information available: %s\n", + mci->mc_idx, msg); + mci->ue_noinfo_count++; + mci->ue_count++; +} + + +#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); + + /* 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 */ + + if (status == 0xFFFF) { + u32 sanity; + pci_read_config_dword(dev, 0, &sanity); + if (sanity == 0xFFFFFFFF) + return 0; + } + status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR | + PCI_STATUS_PARITY; + + 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. */ +static void edac_pci_dev_parity_clear( struct pci_dev *dev ) +{ + 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)) + printk(KERN_CRIT + "EDAC PCI- " + "Signaled System Error on %s\n", + pci_name (dev)); + + if (status & (PCI_STATUS_PARITY)) { + printk(KERN_CRIT + "EDAC PCI- " + "Master Data Parity Error on %s\n", + pci_name (dev)); + + atomic_inc(&pci_parity_count); + } + + if (status & (PCI_STATUS_DETECTED_PARITY)) { + printk(KERN_CRIT + "EDAC PCI- " + "Detected Parity Error on %s\n", + pci_name (dev)); + + 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)) + printk(KERN_CRIT + "EDAC PCI-Bridge- " + "Signaled System Error on %s\n", + pci_name (dev)); + + if (status & (PCI_STATUS_PARITY)) { + printk(KERN_CRIT + "EDAC PCI-Bridge- " + "Master Data Parity Error on %s\n", + pci_name (dev)); + + atomic_inc(&pci_parity_count); + } + + if (status & (PCI_STATUS_DETECTED_PARITY)) { + printk(KERN_CRIT + "EDAC PCI-Bridge- " + "Detected Parity Error on %s\n", + pci_name (dev)); + + 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 + */ +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; + } + } + + return rc; +} + +/* + * pci_dev parity list iterator + * Scan the PCI device list for one iteration, looking for SERRORs + * 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) +{ + struct pci_dev *dev=NULL; + + /* 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) { + + /* 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, + pci_whitelist_count, dev)) + fn(dev); + } else { + /* + * if no whitelist, then check if this devices is + * blacklisted + */ + if (!check_dev_on_list(pci_blacklist, + pci_blacklist_count, dev)) + fn(dev); + } + } +} + +static void do_pci_parity_check(void) +{ + unsigned long flags; + int before_count; + + debugf3("MC: " __FILE__ ": %s()\n", __func__); + + 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 + */ +static inline void check_mc_devices (void) +{ + unsigned long flags; + struct list_head *item; + struct mem_ctl_info *mci; + + debugf3("MC: " __FILE__ ": %s()\n", __func__); + + /* during poll, have interrupts off */ + local_irq_save(flags); + + list_for_each(item, &mc_devices) { + mci = list_entry(item, struct mem_ctl_info, link); + + if (mci->edac_check != NULL) + mci->edac_check(mci); + } + + local_irq_restore(flags); +} + + +/* + * 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) +{ + + debugf3("MC: " __FILE__ ": %s()\n", __func__); + + check_mc_devices(); + + do_pci_parity_check(); +} + + +/* + * EDAC thread state information + */ +struct bs_thread_info +{ + struct task_struct *task; + struct completion *event; + char *name; + void (*run)(void); +}; + +static struct bs_thread_info bs_thread; + +/* + * edac_kernel_thread + * This the kernel thread that processes edac operations + * in a normal thread environment + */ +static int edac_kernel_thread(void *arg) +{ + struct bs_thread_info *thread = (struct bs_thread_info *) arg; + + /* detach thread */ + daemonize(thread->name); + + current->exit_signal = SIGCHLD; + allow_signal(SIGKILL); + thread->task = current; + + /* indicate to starting task we have started */ + complete(thread->event); + + /* loop forever, until we are told to stop */ + while(thread->run != NULL) { + void (*run)(void); + + /* call the function to check the memory controllers */ + run = thread->run; + if (run) + run(); + + if (signal_pending(current)) + flush_signals(current); + + /* ensure we are interruptable */ + set_current_state(TASK_INTERRUPTIBLE); + + /* goto sleep for the interval */ + schedule_timeout((HZ * poll_msec) / 1000); + try_to_freeze(); + } + + /* notify waiter that we are exiting */ + complete(thread->event); + + return 0; +} + +/* + * edac_mc_init + * module initialization entry point + */ +static int __init edac_mc_init(void) +{ + int ret; + struct completion event; + + printk(KERN_INFO "MC: " __FILE__ " version " EDAC_MC_VERSION "\n"); + + /* + * 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(); + + /* perform check for first time to harvest boot leftovers */ + do_edac_check(); + + /* Create the MC sysfs entires */ + if (edac_sysfs_memctrl_setup()) { + printk(KERN_ERR "EDAC MC: Error initializing sysfs code\n"); + return -ENODEV; + } + + /* Create the PCI parity sysfs entries */ + if (edac_sysfs_pci_setup()) { + edac_sysfs_memctrl_teardown(); + printk(KERN_ERR "EDAC PCI: Error initializing sysfs code\n"); + return -ENODEV; + } + + /* Create our kernel thread */ + init_completion(&event); + bs_thread.event = &event; + bs_thread.name = "kedac"; + bs_thread.run = do_edac_check; + + /* create our kernel thread */ + ret = kernel_thread(edac_kernel_thread, &bs_thread, CLONE_KERNEL); + if (ret < 0) { + /* remove the sysfs entries */ + edac_sysfs_memctrl_teardown(); + edac_sysfs_pci_teardown(); + return -ENOMEM; + } + + /* wait for our kernel theard ack that it is up and running */ + wait_for_completion(&event); + + return 0; +} + + +/* + * edac_mc_exit() + * module exit/termination functioni + */ +static void __exit edac_mc_exit(void) +{ + struct completion event; + + debugf0("MC: " __FILE__ ": %s()\n", __func__); + + init_completion(&event); + bs_thread.event = &event; + + /* As soon as ->run is set to NULL, the task could disappear, + * so we need to hold tasklist_lock until we have sent the signal + */ + read_lock(&tasklist_lock); + bs_thread.run = NULL; + send_sig(SIGKILL, bs_thread.task, 1); + read_unlock(&tasklist_lock); + wait_for_completion(&event); + + /* 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" + "Based on.work by Dan Hollis et al"); +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 |
