diff options
Diffstat (limited to 'drivers/edac/edac_mc_sysfs.c')
| -rw-r--r-- | drivers/edac/edac_mc_sysfs.c | 1055 |
1 files changed, 1055 insertions, 0 deletions
diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c new file mode 100644 index 000000000..15f63452a --- /dev/null +++ b/drivers/edac/edac_mc_sysfs.c @@ -0,0 +1,1055 @@ +/* + * edac_mc kernel module + * (C) 2005-2007 Linux Networx (http://lnxi.com) + * + * This file may be distributed under the terms of the + * GNU General Public License. + * + * Written Doug Thompson <norsk5@xmission.com> www.softwarebitmaker.com + * + * (c) 2012-2013 - Mauro Carvalho Chehab + * The entire API were re-written, and ported to use struct device + * + */ + +#include <linux/ctype.h> +#include <linux/slab.h> +#include <linux/edac.h> +#include <linux/bug.h> +#include <linux/pm_runtime.h> +#include <linux/uaccess.h> + +#include "edac_mc.h" +#include "edac_module.h" + +/* MC EDAC Controls, setable by module parameter, and sysfs */ +static int edac_mc_log_ue = 1; +static int edac_mc_log_ce = 1; +static int edac_mc_panic_on_ue; +static unsigned int edac_mc_poll_msec = 1000; + +/* Getter functions for above */ +int edac_mc_get_log_ue(void) +{ + return edac_mc_log_ue; +} + +int edac_mc_get_log_ce(void) +{ + return edac_mc_log_ce; +} + +int edac_mc_get_panic_on_ue(void) +{ + return edac_mc_panic_on_ue; +} + +/* this is temporary */ +unsigned int edac_mc_get_poll_msec(void) +{ + return edac_mc_poll_msec; +} + +static int edac_set_poll_msec(const char *val, const struct kernel_param *kp) +{ + unsigned int i; + int ret; + + if (!val) + return -EINVAL; + + ret = kstrtouint(val, 0, &i); + if (ret) + return ret; + + if (i < 1000) + return -EINVAL; + + *((unsigned int *)kp->arg) = i; + + /* notify edac_mc engine to reset the poll period */ + edac_mc_reset_delay_period(i); + + return 0; +} + +/* Parameter declarations for above */ +module_param(edac_mc_panic_on_ue, int, 0644); +MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on"); +module_param(edac_mc_log_ue, int, 0644); +MODULE_PARM_DESC(edac_mc_log_ue, + "Log uncorrectable error to console: 0=off 1=on"); +module_param(edac_mc_log_ce, int, 0644); +MODULE_PARM_DESC(edac_mc_log_ce, + "Log correctable error to console: 0=off 1=on"); +module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_uint, + &edac_mc_poll_msec, 0644); +MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds"); + +static struct device *mci_pdev; + +/* + * various constants for Memory Controllers + */ +static const char * const 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 * const 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" +}; + +#ifdef CONFIG_EDAC_LEGACY_SYSFS +/* + * EDAC sysfs CSROW data structures and methods + */ + +#define to_csrow(k) container_of(k, struct csrow_info, dev) + +/* + * We need it to avoid namespace conflicts between the legacy API + * and the per-dimm/per-rank one + */ +#define DEVICE_ATTR_LEGACY(_name, _mode, _show, _store) \ + static struct device_attribute dev_attr_legacy_##_name = __ATTR(_name, _mode, _show, _store) + +struct dev_ch_attribute { + struct device_attribute attr; + unsigned int channel; +}; + +#define DEVICE_CHANNEL(_name, _mode, _show, _store, _var) \ + static struct dev_ch_attribute dev_attr_legacy_##_name = \ + { __ATTR(_name, _mode, _show, _store), (_var) } + +#define to_channel(k) (container_of(k, struct dev_ch_attribute, attr)->channel) + +/* Set of more default csrow<id> attribute show/store functions */ +static ssize_t csrow_ue_count_show(struct device *dev, + struct device_attribute *mattr, char *data) +{ + struct csrow_info *csrow = to_csrow(dev); + + return sprintf(data, "%u\n", csrow->ue_count); +} + +static ssize_t csrow_ce_count_show(struct device *dev, + struct device_attribute *mattr, char *data) +{ + struct csrow_info *csrow = to_csrow(dev); + + return sprintf(data, "%u\n", csrow->ce_count); +} + +static ssize_t csrow_size_show(struct device *dev, + struct device_attribute *mattr, char *data) +{ + struct csrow_info *csrow = to_csrow(dev); + int i; + u32 nr_pages = 0; + + for (i = 0; i < csrow->nr_channels; i++) + nr_pages += csrow->channels[i]->dimm->nr_pages; + return sprintf(data, "%u\n", PAGES_TO_MiB(nr_pages)); +} + +static ssize_t csrow_mem_type_show(struct device *dev, + struct device_attribute *mattr, char *data) +{ + struct csrow_info *csrow = to_csrow(dev); + + return sprintf(data, "%s\n", edac_mem_types[csrow->channels[0]->dimm->mtype]); +} + +static ssize_t csrow_dev_type_show(struct device *dev, + struct device_attribute *mattr, char *data) +{ + struct csrow_info *csrow = to_csrow(dev); + + return sprintf(data, "%s\n", dev_types[csrow->channels[0]->dimm->dtype]); +} + +static ssize_t csrow_edac_mode_show(struct device *dev, + struct device_attribute *mattr, + char *data) +{ + struct csrow_info *csrow = to_csrow(dev); + + return sprintf(data, "%s\n", edac_caps[csrow->channels[0]->dimm->edac_mode]); +} + +/* show/store functions for DIMM Label attributes */ +static ssize_t channel_dimm_label_show(struct device *dev, + struct device_attribute *mattr, + char *data) +{ + struct csrow_info *csrow = to_csrow(dev); + unsigned int chan = to_channel(mattr); + struct rank_info *rank = csrow->channels[chan]; + + /* if field has not been initialized, there is nothing to send */ + if (!rank->dimm->label[0]) + return 0; + + return snprintf(data, sizeof(rank->dimm->label) + 1, "%s\n", + rank->dimm->label); +} + +static ssize_t channel_dimm_label_store(struct device *dev, + struct device_attribute *mattr, + const char *data, size_t count) +{ + struct csrow_info *csrow = to_csrow(dev); + unsigned int chan = to_channel(mattr); + struct rank_info *rank = csrow->channels[chan]; + size_t copy_count = count; + + if (count == 0) + return -EINVAL; + + if (data[count - 1] == '\0' || data[count - 1] == '\n') + copy_count -= 1; + + if (copy_count == 0 || copy_count >= sizeof(rank->dimm->label)) + return -EINVAL; + + strncpy(rank->dimm->label, data, copy_count); + rank->dimm->label[copy_count] = '\0'; + + return count; +} + +/* show function for dynamic chX_ce_count attribute */ +static ssize_t channel_ce_count_show(struct device *dev, + struct device_attribute *mattr, char *data) +{ + struct csrow_info *csrow = to_csrow(dev); + unsigned int chan = to_channel(mattr); + struct rank_info *rank = csrow->channels[chan]; + + return sprintf(data, "%u\n", rank->ce_count); +} + +/* cwrow<id>/attribute files */ +DEVICE_ATTR_LEGACY(size_mb, S_IRUGO, csrow_size_show, NULL); +DEVICE_ATTR_LEGACY(dev_type, S_IRUGO, csrow_dev_type_show, NULL); +DEVICE_ATTR_LEGACY(mem_type, S_IRUGO, csrow_mem_type_show, NULL); +DEVICE_ATTR_LEGACY(edac_mode, S_IRUGO, csrow_edac_mode_show, NULL); +DEVICE_ATTR_LEGACY(ue_count, S_IRUGO, csrow_ue_count_show, NULL); +DEVICE_ATTR_LEGACY(ce_count, S_IRUGO, csrow_ce_count_show, NULL); + +/* default attributes of the CSROW<id> object */ +static struct attribute *csrow_attrs[] = { + &dev_attr_legacy_dev_type.attr, + &dev_attr_legacy_mem_type.attr, + &dev_attr_legacy_edac_mode.attr, + &dev_attr_legacy_size_mb.attr, + &dev_attr_legacy_ue_count.attr, + &dev_attr_legacy_ce_count.attr, + NULL, +}; + +static const struct attribute_group csrow_attr_grp = { + .attrs = csrow_attrs, +}; + +static const struct attribute_group *csrow_attr_groups[] = { + &csrow_attr_grp, + NULL +}; + +static const struct device_type csrow_attr_type = { + .groups = csrow_attr_groups, +}; + +/* + * possible dynamic channel DIMM Label attribute files + * + */ +DEVICE_CHANNEL(ch0_dimm_label, S_IRUGO | S_IWUSR, + channel_dimm_label_show, channel_dimm_label_store, 0); +DEVICE_CHANNEL(ch1_dimm_label, S_IRUGO | S_IWUSR, + channel_dimm_label_show, channel_dimm_label_store, 1); +DEVICE_CHANNEL(ch2_dimm_label, S_IRUGO | S_IWUSR, + channel_dimm_label_show, channel_dimm_label_store, 2); +DEVICE_CHANNEL(ch3_dimm_label, S_IRUGO | S_IWUSR, + channel_dimm_label_show, channel_dimm_label_store, 3); +DEVICE_CHANNEL(ch4_dimm_label, S_IRUGO | S_IWUSR, + channel_dimm_label_show, channel_dimm_label_store, 4); +DEVICE_CHANNEL(ch5_dimm_label, S_IRUGO | S_IWUSR, + channel_dimm_label_show, channel_dimm_label_store, 5); +DEVICE_CHANNEL(ch6_dimm_label, S_IRUGO | S_IWUSR, + channel_dimm_label_show, channel_dimm_label_store, 6); +DEVICE_CHANNEL(ch7_dimm_label, S_IRUGO | S_IWUSR, + channel_dimm_label_show, channel_dimm_label_store, 7); +DEVICE_CHANNEL(ch8_dimm_label, S_IRUGO | S_IWUSR, + channel_dimm_label_show, channel_dimm_label_store, 8); +DEVICE_CHANNEL(ch9_dimm_label, S_IRUGO | S_IWUSR, + channel_dimm_label_show, channel_dimm_label_store, 9); +DEVICE_CHANNEL(ch10_dimm_label, S_IRUGO | S_IWUSR, + channel_dimm_label_show, channel_dimm_label_store, 10); +DEVICE_CHANNEL(ch11_dimm_label, S_IRUGO | S_IWUSR, + channel_dimm_label_show, channel_dimm_label_store, 11); + +/* Total possible dynamic DIMM Label attribute file table */ +static struct attribute *dynamic_csrow_dimm_attr[] = { + &dev_attr_legacy_ch0_dimm_label.attr.attr, + &dev_attr_legacy_ch1_dimm_label.attr.attr, + &dev_attr_legacy_ch2_dimm_label.attr.attr, + &dev_attr_legacy_ch3_dimm_label.attr.attr, + &dev_attr_legacy_ch4_dimm_label.attr.attr, + &dev_attr_legacy_ch5_dimm_label.attr.attr, + &dev_attr_legacy_ch6_dimm_label.attr.attr, + &dev_attr_legacy_ch7_dimm_label.attr.attr, + &dev_attr_legacy_ch8_dimm_label.attr.attr, + &dev_attr_legacy_ch9_dimm_label.attr.attr, + &dev_attr_legacy_ch10_dimm_label.attr.attr, + &dev_attr_legacy_ch11_dimm_label.attr.attr, + NULL +}; + +/* possible dynamic channel ce_count attribute files */ +DEVICE_CHANNEL(ch0_ce_count, S_IRUGO, + channel_ce_count_show, NULL, 0); +DEVICE_CHANNEL(ch1_ce_count, S_IRUGO, + channel_ce_count_show, NULL, 1); +DEVICE_CHANNEL(ch2_ce_count, S_IRUGO, + channel_ce_count_show, NULL, 2); +DEVICE_CHANNEL(ch3_ce_count, S_IRUGO, + channel_ce_count_show, NULL, 3); +DEVICE_CHANNEL(ch4_ce_count, S_IRUGO, + channel_ce_count_show, NULL, 4); +DEVICE_CHANNEL(ch5_ce_count, S_IRUGO, + channel_ce_count_show, NULL, 5); +DEVICE_CHANNEL(ch6_ce_count, S_IRUGO, + channel_ce_count_show, NULL, 6); +DEVICE_CHANNEL(ch7_ce_count, S_IRUGO, + channel_ce_count_show, NULL, 7); +DEVICE_CHANNEL(ch8_ce_count, S_IRUGO, + channel_ce_count_show, NULL, 8); +DEVICE_CHANNEL(ch9_ce_count, S_IRUGO, + channel_ce_count_show, NULL, 9); +DEVICE_CHANNEL(ch10_ce_count, S_IRUGO, + channel_ce_count_show, NULL, 10); +DEVICE_CHANNEL(ch11_ce_count, S_IRUGO, + channel_ce_count_show, NULL, 11); + +/* Total possible dynamic ce_count attribute file table */ +static struct attribute *dynamic_csrow_ce_count_attr[] = { + &dev_attr_legacy_ch0_ce_count.attr.attr, + &dev_attr_legacy_ch1_ce_count.attr.attr, + &dev_attr_legacy_ch2_ce_count.attr.attr, + &dev_attr_legacy_ch3_ce_count.attr.attr, + &dev_attr_legacy_ch4_ce_count.attr.attr, + &dev_attr_legacy_ch5_ce_count.attr.attr, + &dev_attr_legacy_ch6_ce_count.attr.attr, + &dev_attr_legacy_ch7_ce_count.attr.attr, + &dev_attr_legacy_ch8_ce_count.attr.attr, + &dev_attr_legacy_ch9_ce_count.attr.attr, + &dev_attr_legacy_ch10_ce_count.attr.attr, + &dev_attr_legacy_ch11_ce_count.attr.attr, + NULL +}; + +static umode_t csrow_dev_is_visible(struct kobject *kobj, + struct attribute *attr, int idx) +{ + struct device *dev = kobj_to_dev(kobj); + struct csrow_info *csrow = container_of(dev, struct csrow_info, dev); + + if (idx >= csrow->nr_channels) + return 0; + + if (idx >= ARRAY_SIZE(dynamic_csrow_ce_count_attr) - 1) { + WARN_ONCE(1, "idx: %d\n", idx); + return 0; + } + + /* Only expose populated DIMMs */ + if (!csrow->channels[idx]->dimm->nr_pages) + return 0; + + return attr->mode; +} + + +static const struct attribute_group csrow_dev_dimm_group = { + .attrs = dynamic_csrow_dimm_attr, + .is_visible = csrow_dev_is_visible, +}; + +static const struct attribute_group csrow_dev_ce_count_group = { + .attrs = dynamic_csrow_ce_count_attr, + .is_visible = csrow_dev_is_visible, +}; + +static const struct attribute_group *csrow_dev_groups[] = { + &csrow_dev_dimm_group, + &csrow_dev_ce_count_group, + NULL +}; + +static void csrow_release(struct device *dev) +{ + /* + * Nothing to do, just unregister sysfs here. The mci + * device owns the data and will also release it. + */ +} + +static inline int nr_pages_per_csrow(struct csrow_info *csrow) +{ + int chan, nr_pages = 0; + + for (chan = 0; chan < csrow->nr_channels; chan++) + nr_pages += csrow->channels[chan]->dimm->nr_pages; + + return nr_pages; +} + +/* Create a CSROW object under specifed edac_mc_device */ +static int edac_create_csrow_object(struct mem_ctl_info *mci, + struct csrow_info *csrow, int index) +{ + int err; + + csrow->dev.type = &csrow_attr_type; + csrow->dev.groups = csrow_dev_groups; + csrow->dev.release = csrow_release; + device_initialize(&csrow->dev); + csrow->dev.parent = &mci->dev; + csrow->mci = mci; + dev_set_name(&csrow->dev, "csrow%d", index); + dev_set_drvdata(&csrow->dev, csrow); + + err = device_add(&csrow->dev); + if (err) { + edac_dbg(1, "failure: create device %s\n", dev_name(&csrow->dev)); + put_device(&csrow->dev); + return err; + } + + edac_dbg(0, "device %s created\n", dev_name(&csrow->dev)); + + return 0; +} + +/* Create a CSROW object under specifed edac_mc_device */ +static int edac_create_csrow_objects(struct mem_ctl_info *mci) +{ + int err, i; + struct csrow_info *csrow; + + for (i = 0; i < mci->nr_csrows; i++) { + csrow = mci->csrows[i]; + if (!nr_pages_per_csrow(csrow)) + continue; + err = edac_create_csrow_object(mci, mci->csrows[i], i); + if (err < 0) + goto error; + } + return 0; + +error: + for (--i; i >= 0; i--) { + if (device_is_registered(&mci->csrows[i]->dev)) + device_unregister(&mci->csrows[i]->dev); + } + + return err; +} + +static void edac_delete_csrow_objects(struct mem_ctl_info *mci) +{ + int i; + + for (i = 0; i < mci->nr_csrows; i++) { + if (device_is_registered(&mci->csrows[i]->dev)) + device_unregister(&mci->csrows[i]->dev); + } +} + +#endif + +/* + * Per-dimm (or per-rank) devices + */ + +#define to_dimm(k) container_of(k, struct dimm_info, dev) + +/* show/store functions for DIMM Label attributes */ +static ssize_t dimmdev_location_show(struct device *dev, + struct device_attribute *mattr, char *data) +{ + struct dimm_info *dimm = to_dimm(dev); + ssize_t count; + + count = edac_dimm_info_location(dimm, data, PAGE_SIZE); + count += scnprintf(data + count, PAGE_SIZE - count, "\n"); + + return count; +} + +static ssize_t dimmdev_label_show(struct device *dev, + struct device_attribute *mattr, char *data) +{ + struct dimm_info *dimm = to_dimm(dev); + + /* if field has not been initialized, there is nothing to send */ + if (!dimm->label[0]) + return 0; + + return snprintf(data, sizeof(dimm->label) + 1, "%s\n", dimm->label); +} + +static ssize_t dimmdev_label_store(struct device *dev, + struct device_attribute *mattr, + const char *data, + size_t count) +{ + struct dimm_info *dimm = to_dimm(dev); + size_t copy_count = count; + + if (count == 0) + return -EINVAL; + + if (data[count - 1] == '\0' || data[count - 1] == '\n') + copy_count -= 1; + + if (copy_count == 0 || copy_count >= sizeof(dimm->label)) + return -EINVAL; + + strncpy(dimm->label, data, copy_count); + dimm->label[copy_count] = '\0'; + + return count; +} + +static ssize_t dimmdev_size_show(struct device *dev, + struct device_attribute *mattr, char *data) +{ + struct dimm_info *dimm = to_dimm(dev); + + return sprintf(data, "%u\n", PAGES_TO_MiB(dimm->nr_pages)); +} + +static ssize_t dimmdev_mem_type_show(struct device *dev, + struct device_attribute *mattr, char *data) +{ + struct dimm_info *dimm = to_dimm(dev); + + return sprintf(data, "%s\n", edac_mem_types[dimm->mtype]); +} + +static ssize_t dimmdev_dev_type_show(struct device *dev, + struct device_attribute *mattr, char *data) +{ + struct dimm_info *dimm = to_dimm(dev); + + return sprintf(data, "%s\n", dev_types[dimm->dtype]); +} + +static ssize_t dimmdev_edac_mode_show(struct device *dev, + struct device_attribute *mattr, + char *data) +{ + struct dimm_info *dimm = to_dimm(dev); + + return sprintf(data, "%s\n", edac_caps[dimm->edac_mode]); +} + +static ssize_t dimmdev_ce_count_show(struct device *dev, + struct device_attribute *mattr, + char *data) +{ + struct dimm_info *dimm = to_dimm(dev); + + return sprintf(data, "%u\n", dimm->ce_count); +} + +static ssize_t dimmdev_ue_count_show(struct device *dev, + struct device_attribute *mattr, + char *data) +{ + struct dimm_info *dimm = to_dimm(dev); + + return sprintf(data, "%u\n", dimm->ue_count); +} + +/* dimm/rank attribute files */ +static DEVICE_ATTR(dimm_label, S_IRUGO | S_IWUSR, + dimmdev_label_show, dimmdev_label_store); +static DEVICE_ATTR(dimm_location, S_IRUGO, dimmdev_location_show, NULL); +static DEVICE_ATTR(size, S_IRUGO, dimmdev_size_show, NULL); +static DEVICE_ATTR(dimm_mem_type, S_IRUGO, dimmdev_mem_type_show, NULL); +static DEVICE_ATTR(dimm_dev_type, S_IRUGO, dimmdev_dev_type_show, NULL); +static DEVICE_ATTR(dimm_edac_mode, S_IRUGO, dimmdev_edac_mode_show, NULL); +static DEVICE_ATTR(dimm_ce_count, S_IRUGO, dimmdev_ce_count_show, NULL); +static DEVICE_ATTR(dimm_ue_count, S_IRUGO, dimmdev_ue_count_show, NULL); + +/* attributes of the dimm<id>/rank<id> object */ +static struct attribute *dimm_attrs[] = { + &dev_attr_dimm_label.attr, + &dev_attr_dimm_location.attr, + &dev_attr_size.attr, + &dev_attr_dimm_mem_type.attr, + &dev_attr_dimm_dev_type.attr, + &dev_attr_dimm_edac_mode.attr, + &dev_attr_dimm_ce_count.attr, + &dev_attr_dimm_ue_count.attr, + NULL, +}; + +static const struct attribute_group dimm_attr_grp = { + .attrs = dimm_attrs, +}; + +static const struct attribute_group *dimm_attr_groups[] = { + &dimm_attr_grp, + NULL +}; + +static const struct device_type dimm_attr_type = { + .groups = dimm_attr_groups, +}; + +static void dimm_release(struct device *dev) +{ + /* + * Nothing to do, just unregister sysfs here. The mci + * device owns the data and will also release it. + */ +} + +/* Create a DIMM object under specifed memory controller device */ +static int edac_create_dimm_object(struct mem_ctl_info *mci, + struct dimm_info *dimm) +{ + int err; + dimm->mci = mci; + + dimm->dev.type = &dimm_attr_type; + dimm->dev.release = dimm_release; + device_initialize(&dimm->dev); + + dimm->dev.parent = &mci->dev; + if (mci->csbased) + dev_set_name(&dimm->dev, "rank%d", dimm->idx); + else + dev_set_name(&dimm->dev, "dimm%d", dimm->idx); + dev_set_drvdata(&dimm->dev, dimm); + pm_runtime_forbid(&mci->dev); + + err = device_add(&dimm->dev); + if (err) { + edac_dbg(1, "failure: create device %s\n", dev_name(&dimm->dev)); + put_device(&dimm->dev); + return err; + } + + if (IS_ENABLED(CONFIG_EDAC_DEBUG)) { + char location[80]; + + edac_dimm_info_location(dimm, location, sizeof(location)); + edac_dbg(0, "device %s created at location %s\n", + dev_name(&dimm->dev), location); + } + + return 0; +} + +/* + * Memory controller device + */ + +#define to_mci(k) container_of(k, struct mem_ctl_info, dev) + +static ssize_t mci_reset_counters_store(struct device *dev, + struct device_attribute *mattr, + const char *data, size_t count) +{ + struct mem_ctl_info *mci = to_mci(dev); + struct dimm_info *dimm; + int row, chan; + + mci->ue_mc = 0; + mci->ce_mc = 0; + mci->ue_noinfo_count = 0; + mci->ce_noinfo_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_for_each_dimm(mci, dimm) { + dimm->ue_count = 0; + dimm->ce_count = 0; + } + + mci->start_time = jiffies; + return count; +} + +/* Memory scrubbing interface: + * + * A MC driver can limit the scrubbing bandwidth based on the CPU type. + * Therefore, ->set_sdram_scrub_rate should be made to return the actual + * bandwidth that is accepted or 0 when scrubbing is to be disabled. + * + * Negative value still means that an error has occurred while setting + * the scrub rate. + */ +static ssize_t mci_sdram_scrub_rate_store(struct device *dev, + struct device_attribute *mattr, + const char *data, size_t count) +{ + struct mem_ctl_info *mci = to_mci(dev); + unsigned long bandwidth = 0; + int new_bw = 0; + + if (kstrtoul(data, 10, &bandwidth) < 0) + return -EINVAL; + + new_bw = mci->set_sdram_scrub_rate(mci, bandwidth); + if (new_bw < 0) { + edac_printk(KERN_WARNING, EDAC_MC, + "Error setting scrub rate to: %lu\n", bandwidth); + return -EINVAL; + } + + return count; +} + +/* + * ->get_sdram_scrub_rate() return value semantics same as above. + */ +static ssize_t mci_sdram_scrub_rate_show(struct device *dev, + struct device_attribute *mattr, + char *data) +{ + struct mem_ctl_info *mci = to_mci(dev); + int bandwidth = 0; + + bandwidth = mci->get_sdram_scrub_rate(mci); + if (bandwidth < 0) { + edac_printk(KERN_DEBUG, EDAC_MC, "Error reading scrub rate\n"); + return bandwidth; + } + + return sprintf(data, "%d\n", bandwidth); +} + +/* default attribute files for the MCI object */ +static ssize_t mci_ue_count_show(struct device *dev, + struct device_attribute *mattr, + char *data) +{ + struct mem_ctl_info *mci = to_mci(dev); + + return sprintf(data, "%u\n", mci->ue_mc); +} + +static ssize_t mci_ce_count_show(struct device *dev, + struct device_attribute *mattr, + char *data) +{ + struct mem_ctl_info *mci = to_mci(dev); + + return sprintf(data, "%u\n", mci->ce_mc); +} + +static ssize_t mci_ce_noinfo_show(struct device *dev, + struct device_attribute *mattr, + char *data) +{ + struct mem_ctl_info *mci = to_mci(dev); + + return sprintf(data, "%u\n", mci->ce_noinfo_count); +} + +static ssize_t mci_ue_noinfo_show(struct device *dev, + struct device_attribute *mattr, + char *data) +{ + struct mem_ctl_info *mci = to_mci(dev); + + return sprintf(data, "%u\n", mci->ue_noinfo_count); +} + +static ssize_t mci_seconds_show(struct device *dev, + struct device_attribute *mattr, + char *data) +{ + struct mem_ctl_info *mci = to_mci(dev); + + return sprintf(data, "%ld\n", (jiffies - mci->start_time) / HZ); +} + +static ssize_t mci_ctl_name_show(struct device *dev, + struct device_attribute *mattr, + char *data) +{ + struct mem_ctl_info *mci = to_mci(dev); + + return sprintf(data, "%s\n", mci->ctl_name); +} + +static ssize_t mci_size_mb_show(struct device *dev, + struct device_attribute *mattr, + char *data) +{ + struct mem_ctl_info *mci = to_mci(dev); + int total_pages = 0, csrow_idx, j; + + for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) { + struct csrow_info *csrow = mci->csrows[csrow_idx]; + + for (j = 0; j < csrow->nr_channels; j++) { + struct dimm_info *dimm = csrow->channels[j]->dimm; + + total_pages += dimm->nr_pages; + } + } + + return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages)); +} + +static ssize_t mci_max_location_show(struct device *dev, + struct device_attribute *mattr, + char *data) +{ + struct mem_ctl_info *mci = to_mci(dev); + int len = PAGE_SIZE; + char *p = data; + int i, n; + + for (i = 0; i < mci->n_layers; i++) { + n = scnprintf(p, len, "%s %d ", + edac_layer_name[mci->layers[i].type], + mci->layers[i].size - 1); + len -= n; + if (len <= 0) + goto out; + + p += n; + } + + p += scnprintf(p, len, "\n"); +out: + return p - data; +} + +/* default Control file */ +static DEVICE_ATTR(reset_counters, S_IWUSR, NULL, mci_reset_counters_store); + +/* default Attribute files */ +static DEVICE_ATTR(mc_name, S_IRUGO, mci_ctl_name_show, NULL); +static DEVICE_ATTR(size_mb, S_IRUGO, mci_size_mb_show, NULL); +static DEVICE_ATTR(seconds_since_reset, S_IRUGO, mci_seconds_show, NULL); +static DEVICE_ATTR(ue_noinfo_count, S_IRUGO, mci_ue_noinfo_show, NULL); +static DEVICE_ATTR(ce_noinfo_count, S_IRUGO, mci_ce_noinfo_show, NULL); +static DEVICE_ATTR(ue_count, S_IRUGO, mci_ue_count_show, NULL); +static DEVICE_ATTR(ce_count, S_IRUGO, mci_ce_count_show, NULL); +static DEVICE_ATTR(max_location, S_IRUGO, mci_max_location_show, NULL); + +/* memory scrubber attribute file */ +static DEVICE_ATTR(sdram_scrub_rate, 0, mci_sdram_scrub_rate_show, + mci_sdram_scrub_rate_store); /* umode set later in is_visible */ + +static struct attribute *mci_attrs[] = { + &dev_attr_reset_counters.attr, + &dev_attr_mc_name.attr, + &dev_attr_size_mb.attr, + &dev_attr_seconds_since_reset.attr, + &dev_attr_ue_noinfo_count.attr, + &dev_attr_ce_noinfo_count.attr, + &dev_attr_ue_count.attr, + &dev_attr_ce_count.attr, + &dev_attr_max_location.attr, + &dev_attr_sdram_scrub_rate.attr, + NULL +}; + +static umode_t mci_attr_is_visible(struct kobject *kobj, + struct attribute *attr, int idx) +{ + struct device *dev = kobj_to_dev(kobj); + struct mem_ctl_info *mci = to_mci(dev); + umode_t mode = 0; + + if (attr != &dev_attr_sdram_scrub_rate.attr) + return attr->mode; + if (mci->get_sdram_scrub_rate) + mode |= S_IRUGO; + if (mci->set_sdram_scrub_rate) + mode |= S_IWUSR; + return mode; +} + +static const struct attribute_group mci_attr_grp = { + .attrs = mci_attrs, + .is_visible = mci_attr_is_visible, +}; + +static const struct attribute_group *mci_attr_groups[] = { + &mci_attr_grp, + NULL +}; + +static const struct device_type mci_attr_type = { + .groups = mci_attr_groups, +}; + +/* + * Create a new Memory Controller kobject instance, + * mc<id> under the 'mc' directory + * + * Return: + * 0 Success + * !0 Failure + */ +int edac_create_sysfs_mci_device(struct mem_ctl_info *mci, + const struct attribute_group **groups) +{ + struct dimm_info *dimm; + int err; + + /* get the /sys/devices/system/edac subsys reference */ + mci->dev.type = &mci_attr_type; + mci->dev.parent = mci_pdev; + mci->dev.groups = groups; + dev_set_name(&mci->dev, "mc%d", mci->mc_idx); + dev_set_drvdata(&mci->dev, mci); + pm_runtime_forbid(&mci->dev); + + err = device_add(&mci->dev); + if (err < 0) { + edac_dbg(1, "failure: create device %s\n", dev_name(&mci->dev)); + /* no put_device() here, free mci with _edac_mc_free() */ + return err; + } + + edac_dbg(0, "device %s created\n", dev_name(&mci->dev)); + + /* + * Create the dimm/rank devices + */ + mci_for_each_dimm(mci, dimm) { + /* Only expose populated DIMMs */ + if (!dimm->nr_pages) + continue; + + err = edac_create_dimm_object(mci, dimm); + if (err) + goto fail; + } + +#ifdef CONFIG_EDAC_LEGACY_SYSFS + err = edac_create_csrow_objects(mci); + if (err < 0) + goto fail; +#endif + + edac_create_debugfs_nodes(mci); + return 0; + +fail: + edac_remove_sysfs_mci_device(mci); + + return err; +} + +/* + * remove a Memory Controller instance + */ +void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci) +{ + struct dimm_info *dimm; + + if (!device_is_registered(&mci->dev)) + return; + + edac_dbg(0, "\n"); + +#ifdef CONFIG_EDAC_DEBUG + edac_debugfs_remove_recursive(mci->debugfs); +#endif +#ifdef CONFIG_EDAC_LEGACY_SYSFS + edac_delete_csrow_objects(mci); +#endif + + mci_for_each_dimm(mci, dimm) { + if (!device_is_registered(&dimm->dev)) + continue; + edac_dbg(1, "unregistering device %s\n", dev_name(&dimm->dev)); + device_unregister(&dimm->dev); + } + + /* only remove the device, but keep mci */ + device_del(&mci->dev); +} + +static void mc_attr_release(struct device *dev) +{ + /* + * There's no container structure here, as this is just the mci + * parent device, used to create the /sys/devices/mc sysfs node. + * So, there are no attributes on it. + */ + edac_dbg(1, "device %s released\n", dev_name(dev)); + kfree(dev); +} + +/* + * Init/exit code for the module. Basically, creates/removes /sys/class/rc + */ +int __init edac_mc_sysfs_init(void) +{ + int err; + + mci_pdev = kzalloc(sizeof(*mci_pdev), GFP_KERNEL); + if (!mci_pdev) + return -ENOMEM; + + mci_pdev->bus = edac_get_sysfs_subsys(); + mci_pdev->release = mc_attr_release; + mci_pdev->init_name = "mc"; + + err = device_register(mci_pdev); + if (err < 0) { + edac_dbg(1, "failure: create device %s\n", dev_name(mci_pdev)); + put_device(mci_pdev); + return err; + } + + edac_dbg(0, "device %s created\n", dev_name(mci_pdev)); + + return 0; +} + +void edac_mc_sysfs_exit(void) +{ + device_unregister(mci_pdev); +} |