/* * edac_mc kernel module * (C) 2005, 2006 Linux Networx (http://lnxi.com) * This file may be distributed under the terms of the * GNU General Public License. * * Written by Thayne Harbaugh * Based on work by Dan Hollis <goemon at anime dot net> and others. * http://www.anime.net/~goemon/linux-ecc/ * * Modified by Dave Peterson and Doug Thompson * */ #include <linux/module.h> #include <linux/proc_fs.h> #include <linux/kernel.h> #include <linux/types.h> #include <linux/smp.h> #include <linux/init.h> #include <linux/sysctl.h> #include <linux/highmem.h> #include <linux/timer.h> #include <linux/slab.h> #include <linux/jiffies.h> #include <linux/spinlock.h> #include <linux/list.h> #include <linux/sysdev.h> #include <linux/ctype.h> #include <linux/kthread.h> #include <linux/freezer.h> #include <asm/uaccess.h> #include <asm/page.h> #include <asm/edac.h> #include "edac_mc.h" #define EDAC_MC_VERSION "Ver: 2.0.1 " __DATE__ #ifdef CONFIG_EDAC_DEBUG /* Values of 0 to 4 will generate output */ int edac_debug_level = 1; EXPORT_SYMBOL_GPL(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; static int poll_msec = 1000; /* lock to memory controller's control array */ static DECLARE_MUTEX(mem_ctls_mutex); static struct list_head mc_devices = LIST_HEAD_INIT(mc_devices); static struct task_struct *edac_thread; #ifdef CONFIG_PCI 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); static struct kobject edac_pci_kobj; /* /sys/devices/system/edac/pci */ static struct completion edac_pci_kobj_complete; #endif /* CONFIG_PCI */ /* 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 object: * /sys/devices/system/edac/mc */ static struct kobject edac_memctrl_kobj; /* 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; /* * /sys/devices/system/edac/mc; * data structures and methods */ static ssize_t memctrl_int_show(void *ptr, char *buffer) { int *value = (int*) ptr; return sprintf(buffer, "%u\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, \ }; /* 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) { debugf1("%s()\n", __func__); complete(&edac_memctrl_kobj_complete); } 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("%s()\n", __func__); /* create the /sys/devices/system/edac directory */ err = sysdev_class_register(&edac_class); if (err) { debugf1("%s() error=%d\n", __func__, err); return 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"); if (err) goto fail; /* FIXME: maybe new sysdev_create_subdir() */ err = kobject_register(&edac_memctrl_kobj); if (err) { debugf1("Failed to register '.../edac/mc'\n"); goto fail; } debugf1("Registered '.../edac/mc' kobject\n"); return 0; fail: sysdev_class_unregister(&edac_class); 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 and wait for reference count to reach * 0. */ init_completion(&edac_memctrl_kobj_complete); kobject_unregister(&edac_memctrl_kobj); wait_for_completion(&edac_memctrl_kobj_complete); /* Unregister the 'edac' object */ sysdev_class_unregister(&edac_class); } #ifdef CONFIG_PCI 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, \ }; /* 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, NULL, }; /* No memory to release */ static void edac_pci_release(struct kobject *kobj) { debugf1("%s()\n", __func__); complete(&edac_pci_kobj_complete); } 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("%s()\n", __func__); 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"); 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("%s()\n", __func__); init_completion(&edac_pci_kobj_complete); kobject_unregister(&edac_pci_kobj); wait_for_completion(&edac_pci_kobj_complete); } 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)) edac_printk(KERN_CRIT, EDAC_PCI, "Signaled System Error on %s\n", pci_name(dev)); if (status & (PCI_STATUS_PARITY)) { edac_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)) { edac_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)) edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " "Signaled System Error on %s\n", pci_name(dev)); if (status & (PCI_STATUS_PARITY)) { edac_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)) { edac_printk(KERN_CRIT, EDAC_PCI, "Bridge " "Detected Parity Error on %s\n", pci_name(dev)); atomic_inc(&pci_parity_count); } } } } /* * 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) { fn(dev); } } static void do_pci_parity_check(void) { unsigned long flags; int before_count; debugf3("%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 */ /* pre-process these away */ #define do_pci_parity_check() #define clear_pci_parity_errors() #define edac_sysfs_pci_teardown() #define edac_sysfs_pci_setup() (0) #endif /* CONFIG_PCI */ /* EDAC sysfs CSROW data structures and methods */ /* Set of more default csrow<id> attribute show/store functions */ static ssize_t csrow_ue_count_show(struct csrow_info *csrow, char *data, int private) { return sprintf(data,"%u\n", csrow->ue_count); } static ssize_t csrow_ce_count_show(struct csrow_info *csrow, char *data, int private) { return sprintf(data,"%u\n", csrow->ce_count); } static ssize_t csrow_size_show(struct csrow_info *csrow, char *data, int private) { return sprintf(data,"%u\n", PAGES_TO_MiB(csrow->nr_pages)); } static ssize_t csrow_mem_type_show(struct csrow_info *csrow, char *data, int private) { return sprintf(data,"%s\n", mem_types[csrow->mtype]); } static ssize_t csrow_dev_type_show(struct csrow_info *csrow, char *data, int private) { return sprintf(data,"%s\n", dev_types[csrow->dtype]); } static ssize_t csrow_edac_mode_show(struct csrow_info *csrow, char *data, int private) { return sprintf(data,"%s\n", edac_caps[csrow->edac_mode]); } /* show/store functions for DIMM Label attributes */ static ssize_t channel_dimm_label_show(struct csrow_info *csrow, char *data, int channel) { return snprintf(data, EDAC_MC_LABEL_LEN,"%s", csrow->channels[channel].label); } static ssize_t channel_dimm_label_store(struct csrow_info *csrow, const char *data, size_t count, int channel) { ssize_t max_size = 0; max_size = min((ssize_t)count,(ssize_t)EDAC_MC_LABEL_LEN-1); strncpy(csrow->channels[channel].label, data, max_size); csrow->channels[channel].label[max_size] = '\0'; return max_size; } /* show function for dynamic chX_ce_count attribute */ static ssize_t channel_ce_count_show(struct csrow_info *csrow, char *data, int channel) { return sprintf(data, "%u\n", csrow->channels[channel].ce_count); } /* csrow specific attribute structure */ struct csrowdev_attribute { struct attribute attr; ssize_t (*show)(struct csrow_info *,char *,int); ssize_t (*store)(struct csrow_info *, const char *,size_t,int); int private; }; #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 default csrow attributes */ 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, csrowdev_attr->private); 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, csrowdev_attr->private); return -EIO; } static struct sysfs_ops csrowfs_ops = { .show = csrowdev_show, .store = csrowdev_store }; #define CSROWDEV_ATTR(_name,_mode,_show,_store,_private) \ struct csrowdev_attribute attr_##_name = { \ .attr = {.name = __stringify(_name), .mode = _mode }, \ .show = _show, \ .store = _store, \ .private = _private, \ }; /* default cwrow<id>/attribute files */ CSROWDEV_ATTR(size_mb,S_IRUGO,csrow_size_show,NULL,0); CSROWDEV_ATTR(dev_type,S_IRUGO,csrow_dev_type_show,NULL,0); CSROWDEV_ATTR(mem_type,S_IRUGO,csrow_mem_type_show,NULL,0); CSROWDEV_ATTR(edac_mode,S_IRUGO,csrow_edac_mode_show,NULL,0); CSROWDEV_ATTR(ue_count,S_IRUGO,csrow_ue_count_show,NULL,0); CSROWDEV_ATTR(ce_count,S_IRUGO,csrow_ce_count_show,NULL,0); /* default attributes of the CSROW<id> object */ static struct csrowdev_attribute *default_csrow_attr[] = { &attr_dev_type, &attr_mem_type, &attr_edac_mode, &attr_size_mb, &attr_ue_count, &attr_ce_count, NULL, }; /* possible dynamic channel DIMM Label attribute files */ CSROWDEV_ATTR(ch0_dimm_label,S_IRUGO|S_IWUSR, channel_dimm_label_show, channel_dimm_label_store, 0 ); CSROWDEV_ATTR(ch1_dimm_label,S_IRUGO|S_IWUSR, channel_dimm_label_show, channel_dimm_label_store, 1 ); CSROWDEV_ATTR(ch2_dimm_label,S_IRUGO|S_IWUSR, channel_dimm_label_show, channel_dimm_label_store, 2 ); CSROWDEV_ATTR(ch3_dimm_label,S_IRUGO|S_IWUSR, channel_dimm_label_show, channel_dimm_label_store, 3 ); CSROWDEV_ATTR(ch4_dimm_label,S_IRUGO|S_IWUSR, channel_dimm_label_show, channel_dimm_label_store, 4 ); CSROWDEV_ATTR(ch5_dimm_label,S_IRUGO|S_IWUSR, channel_dimm_label_show, channel_dimm_label_store, 5 ); /* Total possible dynamic DIMM Label attribute file table */ static struct csrowdev_attribute *dynamic_csrow_dimm_attr[] = { &attr_ch0_dimm_label, &attr_ch1_dimm_label, &attr_ch2_dimm_label, &attr_ch3_dimm_label, &attr_ch4_dimm_label, &attr_ch5_dimm_label }; /* possible dynamic channel ce_count attribute files */ CSROWDEV_ATTR(ch0_ce_count,S_IRUGO|S_IWUSR, channel_ce_count_show, NULL, 0 ); CSROWDEV_ATTR(ch1_ce_count,S_IRUGO|S_IWUSR, channel_ce_count_show, NULL, 1 ); CSROWDEV_ATTR(ch2_ce_count,S_IRUGO|S_IWUSR, channel_ce_count_show, NULL, 2 ); CSROWDEV_ATTR(ch3_ce_count,S_IRUGO|S_IWUSR, channel_ce_count_show, NULL, 3 ); CSROWDEV_ATTR(ch4_ce_count,S_IRUGO|S_IWUSR, channel_ce_count_show, NULL, 4 ); CSROWDEV_ATTR(ch5_ce_count,S_IRUGO|S_IWUSR, channel_ce_count_show, NULL, 5 ); /* Total possible dynamic ce_count attribute file table */ static struct csrowdev_attribute *dynamic_csrow_ce_count_attr[] = { &attr_ch0_ce_count, &attr_ch1_ce_count, &attr_ch2_ce_count, &attr_ch3_ce_count, &attr_ch4_ce_count, &attr_ch5_ce_count }; #define EDAC_NR_CHANNELS 6 /* Create dynamic CHANNEL files, indexed by 'chan', under specifed CSROW */ static int edac_create_channel_files(struct kobject *kobj, int chan) { int err=-ENODEV; if (chan >= EDAC_NR_CHANNELS) return err; /* create the DIMM label attribute file */ err = sysfs_create_file(kobj, (struct attribute *) dynamic_csrow_dimm_attr[chan]); if (!err) { /* create the CE Count attribute file */ err = sysfs_create_file(kobj, (struct attribute *) dynamic_csrow_ce_count_attr[chan]); } else { debugf1("%s() dimm labels and ce_count files created", __func__); } return err; } /* No memory to release for this kobj */ static void edac_csrow_instance_release(struct kobject *kobj) { struct csrow_info *cs; cs = container_of(kobj, struct csrow_info, kobj); complete(&cs->kobj_complete); } /* the kobj_type instance for a CSROW */ static struct kobj_type ktype_csrow = { .release = edac_csrow_instance_release, .sysfs_ops = &csrowfs_ops, .default_attrs = (struct attribute **) default_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; int chan; 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); if (err) goto error_exit; /* Instanstiate the csrow object */ err = kobject_register(&csrow->kobj); if (!err) { /* Create the dyanmic attribute files on this csrow, * namely, the DIMM labels and the channel ce_count */ for (chan = 0; chan < csrow->nr_channels; chan++) { err = edac_create_channel_files(&csrow->kobj,chan); if (err) break; } } error_exit: return err; } /* default sysfs methods and data structures for the main MCI kobject */ 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; } /* memory scrubbing */ static ssize_t mci_sdram_scrub_rate_store(struct mem_ctl_info *mci, const char *data, size_t count) { u32 bandwidth = -1; if (mci->set_sdram_scrub_rate) { memctrl_int_store(&bandwidth, data, count); if (!(*mci->set_sdram_scrub_rate)(mci, &bandwidth)) { edac_printk(KERN_DEBUG, EDAC_MC, "Scrub rate set successfully, applied: %d\n", bandwidth); } else { /* FIXME: error codes maybe? */ edac_printk(KERN_DEBUG, EDAC_MC, "Scrub rate set FAILED, could not apply: %d\n", bandwidth); } } else { /* FIXME: produce "not implemented" ERROR for user-side. */ edac_printk(KERN_WARNING, EDAC_MC, "Memory scrubbing 'set'control is not implemented!\n"); } return count; } static ssize_t mci_sdram_scrub_rate_show(struct mem_ctl_info *mci, char *data) { u32 bandwidth = -1; if (mci->get_sdram_scrub_rate) { if (!(*mci->get_sdram_scrub_rate)(mci, &bandwidth)) { edac_printk(KERN_DEBUG, EDAC_MC, "Scrub rate successfully, fetched: %d\n", bandwidth); } else { /* FIXME: error codes maybe? */ edac_printk(KERN_DEBUG, EDAC_MC, "Scrub rate fetch FAILED, got: %d\n", bandwidth); } } else { /* FIXME: produce "not implemented" ERROR for user-side. */ edac_printk(KERN_WARNING, EDAC_MC, "Memory scrubbing 'get' control is not implemented!\n"); } return sprintf(data, "%d\n", bandwidth); } /* default attribute files for the MCI object */ 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_ctl_name_show(struct mem_ctl_info *mci, char *data) { return sprintf(data,"%s\n", mci->ctl_name); } 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) /* MCI show/store functions for top most object */ 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, \ }; /* default Control file */ MCIDEV_ATTR(reset_counters,S_IWUSR,NULL,mci_reset_counters_store); /* default Attribute files */ MCIDEV_ATTR(mc_name,S_IRUGO,mci_ctl_name_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); /* memory scrubber attribute file */ MCIDEV_ATTR(sdram_scrub_rate,S_IRUGO|S_IWUSR,mci_sdram_scrub_rate_show,mci_sdram_scrub_rate_store); static struct mcidev_attribute *mci_attr[] = { &mci_attr_reset_counters, &mci_attr_mc_name, &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, &mci_attr_sdram_scrub_rate, NULL }; /* * Release of a MC controlling instance */ static void edac_mci_instance_release(struct kobject *kobj) { struct mem_ctl_info *mci; mci = to_mci(kobj); debugf0("%s() idx=%d\n", __func__, mci->mc_idx); complete(&mci->kobj_complete); } 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("%s() idx=%d\n", __func__, mci->mc_idx); 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); 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->dev->kobj, EDAC_DEVICE_SYMLINK); if (err) goto fail0; /* 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 fail1; } } return 0; /* CSROW error: backout what has already been registered, */ fail1: for ( i--; i >= 0; i--) { if (csrow->nr_pages > 0) { init_completion(&csrow->kobj_complete); kobject_unregister(&mci->csrows[i].kobj); wait_for_completion(&csrow->kobj_complete); } } fail0: init_completion(&mci->kobj_complete); kobject_unregister(edac_mci_kobj); wait_for_completion(&mci->kobj_complete); return err; } /* * remove a Memory Controller instance */ static void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci) { int i; debugf0("%s()\n", __func__); /* remove all csrow kobjects */ for (i = 0; i < mci->nr_csrows; i++) { if (mci->csrows[i].nr_pages > 0) { init_completion(&mci->csrows[i].kobj_complete); kobject_unregister(&mci->csrows[i].kobj); wait_for_completion(&mci->csrows[i].kobj_complete); } } sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK); init_completion(&mci->kobj_complete); kobject_unregister(&mci->edac_mci_kobj); wait_for_completion(&mci->kobj_complete); } /* 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); } EXPORT_SYMBOL_GPL(edac_mc_dump_channel); 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_GPL(edac_mc_dump_csrow); 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("\tdev = %p\n", mci->dev); debugf3("\tmod_name:ctl_name = %s:%s\n", mci->mod_name, mci->ctl_name); debugf3("\tpvt_info = %p\n\n", mci->pvt_info); } EXPORT_SYMBOL_GPL(edac_mc_dump_mci); #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); } /** * 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_GPL(edac_mc_alloc); /** * 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) { kfree(mci); } EXPORT_SYMBOL_GPL(edac_mc_free); static struct mem_ctl_info *find_mci_by_dev(struct device *dev) { struct mem_ctl_info *mci; struct list_head *item; debugf3("%s()\n", __func__); list_for_each(item, &mc_devices) { mci = list_entry(item, struct mem_ctl_info, link); if (mci->dev == dev) return mci; } return NULL; } /* Return 0 on success, 1 on failure. * Before calling this function, caller must * assign a unique value to mci->mc_idx. */ static int add_mc_to_global_list (struct mem_ctl_info *mci) { struct list_head *item, *insert_before; struct mem_ctl_info *p; insert_before = &mc_devices; if (unlikely((p = find_mci_by_dev(mci->dev)) != NULL)) goto fail0; list_for_each(item, &mc_devices) { p = list_entry(item, struct mem_ctl_info, link); if (p->mc_idx >= mci->mc_idx) { if (unlikely(p->mc_idx == mci->mc_idx)) goto fail1; insert_before = item; break; } } list_add_tail_rcu(&mci->link, insert_before); return 0; fail0: edac_printk(KERN_WARNING, EDAC_MC, "%s (%s) %s %s already assigned %d\n", p->dev->bus_id, dev_name(p->dev), p->mod_name, p->ctl_name, p->mc_idx); return 1; fail1: edac_printk(KERN_WARNING, EDAC_MC, "bug in low-level driver: attempt to assign\n" " duplicate mc_idx %d in %s()\n", p->mc_idx, __func__); return 1; } 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); } /** * edac_mc_add_mc: Insert the 'mci' structure into the mci global list and * create sysfs entries associated with mci structure * @mci: pointer to the mci structure to be added to the list * @mc_idx: A unique numeric identifier to be assigned to the 'mci' structure. * * 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 mc_idx) { debugf0("%s()\n", __func__); mci->mc_idx = mc_idx; #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 fail0; /* set load time so that error rate can be tracked */ mci->start_time = jiffies; if (edac_create_sysfs_mci_device(mci)) { edac_mc_printk(mci, KERN_WARNING, "failed to create sysfs device\n"); goto fail1; } /* Report action taken */ edac_mc_printk(mci, KERN_INFO, "Giving out device to %s %s: DEV %s\n", mci->mod_name, mci->ctl_name, dev_name(mci->dev)); up(&mem_ctls_mutex); return 0; fail1: del_mc_from_global_list(mci); fail0: up(&mem_ctls_mutex); return 1; } EXPORT_SYMBOL_GPL(edac_mc_add_mc); /** * edac_mc_del_mc: Remove sysfs entries for specified mci structure and * remove mci structure from global list * @pdev: Pointer to 'struct device' representing mci structure to remove. * * Return pointer to removed mci structure, or NULL if device not found. */ struct mem_ctl_info * edac_mc_del_mc(struct device *dev) { struct mem_ctl_info *mci; debugf0("MC: %s()\n", __func__); down(&mem_ctls_mutex); if ((mci = find_mci_by_dev(dev)) == NULL) { up(&mem_ctls_mutex); return NULL; } edac_remove_sysfs_mci_device(mci); del_mc_from_global_list(mci); up(&mem_ctls_mutex); edac_printk(KERN_INFO, EDAC_MC, "Removed device %d for %s %s: DEV %s\n", mci->mc_idx, mci->mod_name, mci->ctl_name, dev_name(mci->dev)); return mci; } EXPORT_SYMBOL_GPL(edac_mc_del_mc); void edac_mc_scrub_block(unsigned long page, unsigned long offset, u32 size) { struct page *pg; void *virt_addr; unsigned long flags = 0; debugf3("%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); } EXPORT_SYMBOL_GPL(edac_mc_scrub_block); /* FIXME - should return -1 */ 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: %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: %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) edac_mc_printk(mci, KERN_ERR, "could not look up page error address %lx\n", (unsigned long) page); return row; } EXPORT_SYMBOL_GPL(edac_mc_find_csrow_by_page); /* 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: %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 */ edac_mc_printk(mci, KERN_ERR, "INTERNAL ERROR: row out of range " "(%d >= %d)\n", 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 */ edac_mc_printk(mci, KERN_ERR, "INTERNAL ERROR: channel out of range " "(%d >= %d)\n", channel, mci->csrows[row].nr_channels); edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR"); return; } if (log_ce) /* FIXME - put in DIMM location */ 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); 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_GPL(edac_mc_handle_ce); void edac_mc_handle_ce_no_info(struct mem_ctl_info *mci, const char *msg) { if (log_ce) edac_mc_printk(mci, KERN_WARNING, "CE - no information available: %s\n", msg); mci->ce_noinfo_count++; mci->ce_count++; } EXPORT_SYMBOL_GPL(edac_mc_handle_ce_no_info); 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: %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 */ edac_mc_printk(mci, KERN_ERR, "INTERNAL ERROR: row out of range " "(%d >= %d)\n", 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) 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); 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_GPL(edac_mc_handle_ue); 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) edac_mc_printk(mci, KERN_WARNING, "UE - no information available: %s\n", msg); mci->ue_noinfo_count++; mci->ue_count++; } EXPORT_SYMBOL_GPL(edac_mc_handle_ue_no_info); /************************************************************* * On Fully Buffered DIMM modules, this help function is * called to process UE events */ void edac_mc_handle_fbd_ue(struct mem_ctl_info *mci, unsigned int csrow, unsigned int channela, unsigned int channelb, char *msg) { int len = EDAC_MC_LABEL_LEN * 4; char labels[len + 1]; char *pos = labels; int chars; if (csrow >= mci->nr_csrows) { /* something is wrong */ edac_mc_printk(mci, KERN_ERR, "INTERNAL ERROR: row out of range (%d >= %d)\n", csrow, mci->nr_csrows); edac_mc_handle_ue_no_info(mci, "INTERNAL ERROR"); return; } if (channela >= mci->csrows[csrow].nr_channels) { /* something is wrong */ edac_mc_printk(mci, KERN_ERR, "INTERNAL ERROR: channel-a out of range " "(%d >= %d)\n", channela, mci->csrows[csrow].nr_channels); edac_mc_handle_ue_no_info(mci, "INTERNAL ERROR"); return; } if (channelb >= mci->csrows[csrow].nr_channels) { /* something is wrong */ edac_mc_printk(mci, KERN_ERR, "INTERNAL ERROR: channel-b out of range " "(%d >= %d)\n", channelb, mci->csrows[csrow].nr_channels); edac_mc_handle_ue_no_info(mci, "INTERNAL ERROR"); return; } mci->ue_count++; mci->csrows[csrow].ue_count++; /* Generate the DIMM labels from the specified channels */ chars = snprintf(pos, len + 1, "%s", mci->csrows[csrow].channels[channela].label); len -= chars; pos += chars; chars = snprintf(pos, len + 1, "-%s", mci->csrows[csrow].channels[channelb].label); if (log_ue) edac_mc_printk(mci, KERN_EMERG, "UE row %d, channel-a= %d channel-b= %d " "labels \"%s\": %s\n", csrow, channela, channelb, labels, msg); if (panic_on_ue) panic("UE row %d, channel-a= %d channel-b= %d " "labels \"%s\": %s\n", csrow, channela, channelb, labels, msg); } EXPORT_SYMBOL(edac_mc_handle_fbd_ue); /************************************************************* * On Fully Buffered DIMM modules, this help function is * called to process CE events */ void edac_mc_handle_fbd_ce(struct mem_ctl_info *mci, unsigned int csrow, unsigned int channel, char *msg) { /* Ensure boundary values */ if (csrow >= mci->nr_csrows) { /* something is wrong */ edac_mc_printk(mci, KERN_ERR, "INTERNAL ERROR: row out of range (%d >= %d)\n", csrow, mci->nr_csrows); edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR"); return; } if (channel >= mci->csrows[csrow].nr_channels) { /* something is wrong */ edac_mc_printk(mci, KERN_ERR, "INTERNAL ERROR: channel out of range (%d >= %d)\n", channel, mci->csrows[csrow].nr_channels); edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR"); return; } if (log_ce) /* FIXME - put in DIMM location */ edac_mc_printk(mci, KERN_WARNING, "CE row %d, channel %d, label \"%s\": %s\n", csrow, channel, mci->csrows[csrow].channels[channel].label, msg); mci->ce_count++; mci->csrows[csrow].ce_count++; mci->csrows[csrow].channels[channel].ce_count++; } EXPORT_SYMBOL(edac_mc_handle_fbd_ce); /* * Iterate over all MC instances and check for ECC, et al, errors */ static inline void check_mc_devices(void) { struct list_head *item; struct mem_ctl_info *mci; debugf3("%s()\n", __func__); down(&mem_ctls_mutex); list_for_each(item, &mc_devices) { mci = list_entry(item, struct mem_ctl_info, link); if (mci->edac_check != NULL) mci->edac_check(mci); } up(&mem_ctls_mutex); } /* * 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("%s()\n", __func__); check_mc_devices(); do_pci_parity_check(); } static int edac_kernel_thread(void *arg) { while (!kthread_should_stop()) { do_edac_check(); /* goto sleep for the interval */ schedule_timeout_interruptible((HZ * poll_msec) / 1000); try_to_freeze(); } return 0; } /* * edac_mc_init * module initialization entry point */ static int __init edac_mc_init(void) { edac_printk(KERN_INFO, EDAC_MC, 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(); /* Create the MC sysfs entries */ if (edac_sysfs_memctrl_setup()) { edac_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(); edac_printk(KERN_ERR, EDAC_MC, "EDAC PCI: Error initializing sysfs code\n"); return -ENODEV; } /* create our kernel thread */ edac_thread = kthread_run(edac_kernel_thread, NULL, "kedac"); if (IS_ERR(edac_thread)) { /* remove the sysfs entries */ edac_sysfs_memctrl_teardown(); edac_sysfs_pci_teardown(); return PTR_ERR(edac_thread); } return 0; } /* * edac_mc_exit() * module exit/termination functioni */ static void __exit edac_mc_exit(void) { debugf0("%s()\n", __func__); kthread_stop(edac_thread); /* 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"); #ifdef CONFIG_PCI 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"); #endif 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