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edac_mc_sysfs.c
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/*
* 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_core.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 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 */
int edac_mc_get_poll_msec(void)
{
return edac_mc_poll_msec;
}
static int edac_set_poll_msec(const char *val, struct kernel_param *kp)
{
unsigned long l;
int ret;
if (!val)
return -EINVAL;
ret = kstrtoul(val, 0, &l);
if (ret)
return ret;
if (l < 1000)
return -EINVAL;
*((unsigned long *)kp->arg) = l;
/* notify edac_mc engine to reset the poll period */
edac_mc_reset_delay_period(l);
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_int,
&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 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",
[MEM_DDR2] = "Unbuffered-DDR2",
[MEM_FB_DDR2] = "FullyBuffered-DDR2",
[MEM_RDDR2] = "Registered-DDR2",
[MEM_XDR] = "XDR",
[MEM_DDR3] = "Unbuffered-DDR3",
[MEM_RDDR3] = "Registered-DDR3",
[MEM_DDR4] = "Unbuffered-DDR4",
[MEM_RDDR4] = "Registered-DDR4"
};
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;
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", 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 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, EDAC_MC_LABEL_LEN, "%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 chan = to_channel(mattr);
struct rank_info *rank = csrow->channels[chan];
ssize_t max_size = 0;
max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
strncpy(rank->dimm->label, data, max_size);
rank->dimm->label[max_size] = '\0';
return max_size;
}
/* 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 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 struct attribute_group csrow_attr_grp = {
.attrs = csrow_attrs,
};
static const struct attribute_group *csrow_attr_groups[] = {
&csrow_attr_grp,
NULL
};
static void csrow_attr_release(struct device *dev)
{
struct csrow_info *csrow = container_of(dev, struct csrow_info, dev);
edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
kfree(csrow);
}
static struct device_type csrow_attr_type = {
.groups = csrow_attr_groups,
.release = csrow_attr_release,
};
/*
* possible dynamic channel DIMM Label attribute files
*
*/
#define EDAC_NR_CHANNELS 6
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);
/* Total possible dynamic DIMM Label attribute file table */
static struct device_attribute *dynamic_csrow_dimm_attr[] = {
&dev_attr_legacy_ch0_dimm_label.attr,
&dev_attr_legacy_ch1_dimm_label.attr,
&dev_attr_legacy_ch2_dimm_label.attr,
&dev_attr_legacy_ch3_dimm_label.attr,
&dev_attr_legacy_ch4_dimm_label.attr,
&dev_attr_legacy_ch5_dimm_label.attr
};
/* 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);
/* Total possible dynamic ce_count attribute file table */
static struct device_attribute *dynamic_csrow_ce_count_attr[] = {
&dev_attr_legacy_ch0_ce_count.attr,
&dev_attr_legacy_ch1_ce_count.attr,
&dev_attr_legacy_ch2_ce_count.attr,
&dev_attr_legacy_ch3_ce_count.attr,
&dev_attr_legacy_ch4_ce_count.attr,
&dev_attr_legacy_ch5_ce_count.attr
};
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, chan;
if (csrow->nr_channels > EDAC_NR_CHANNELS)
return -ENODEV;
csrow->dev.type = &csrow_attr_type;
csrow->dev.bus = mci->bus;
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);
edac_dbg(0, "creating (virtual) csrow node %s\n",
dev_name(&csrow->dev));
err = device_add(&csrow->dev);
if (err < 0)
return err;
for (chan = 0; chan < csrow->nr_channels; chan++) {
/* Only expose populated DIMMs */
if (!csrow->channels[chan]->dimm->nr_pages)
continue;
err = device_create_file(&csrow->dev,
dynamic_csrow_dimm_attr[chan]);
if (err < 0)
goto error;
err = device_create_file(&csrow->dev,
dynamic_csrow_ce_count_attr[chan]);
if (err < 0) {
device_remove_file(&csrow->dev,
dynamic_csrow_dimm_attr[chan]);
goto error;
}
}
return 0;
error:
for (--chan; chan >= 0; chan--) {
device_remove_file(&csrow->dev,
dynamic_csrow_dimm_attr[chan]);
device_remove_file(&csrow->dev,
dynamic_csrow_ce_count_attr[chan]);
}
put_device(&csrow->dev);
return err;
}
/* Create a CSROW object under specifed edac_mc_device */
static int edac_create_csrow_objects(struct mem_ctl_info *mci)
{
int err, i, chan;
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) {
edac_dbg(1,
"failure: create csrow objects for csrow %d\n",
i);
goto error;
}
}
return 0;
error:
for (--i; i >= 0; i--) {
csrow = mci->csrows[i];
if (!nr_pages_per_csrow(csrow))
continue;
for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
if (!csrow->channels[chan]->dimm->nr_pages)
continue;
device_remove_file(&csrow->dev,
dynamic_csrow_dimm_attr[chan]);
device_remove_file(&csrow->dev,
dynamic_csrow_ce_count_attr[chan]);
}
put_device(&mci->csrows[i]->dev);
}
return err;
}
static void edac_delete_csrow_objects(struct mem_ctl_info *mci)
{
int i, chan;
struct csrow_info *csrow;
for (i = mci->nr_csrows - 1; i >= 0; i--) {
csrow = mci->csrows[i];
if (!nr_pages_per_csrow(csrow))
continue;
for (chan = csrow->nr_channels - 1; chan >= 0; chan--) {
if (!csrow->channels[chan]->dimm->nr_pages)
continue;
edac_dbg(1, "Removing csrow %d channel %d sysfs nodes\n",
i, chan);
device_remove_file(&csrow->dev,
dynamic_csrow_dimm_attr[chan]);
device_remove_file(&csrow->dev,
dynamic_csrow_ce_count_attr[chan]);
}
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);
return edac_dimm_info_location(dimm, data, PAGE_SIZE);
}
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, EDAC_MC_LABEL_LEN, "%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);
ssize_t max_size = 0;
max_size = min((ssize_t) count, (ssize_t) EDAC_MC_LABEL_LEN - 1);
strncpy(dimm->label, data, max_size);
dimm->label[max_size] = '\0';
return max_size;
}
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", 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]);
}
/* 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);
/* 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,
NULL,
};
static struct attribute_group dimm_attr_grp = {
.attrs = dimm_attrs,
};
static const struct attribute_group *dimm_attr_groups[] = {
&dimm_attr_grp,
NULL
};
static void dimm_attr_release(struct device *dev)
{
struct dimm_info *dimm = container_of(dev, struct dimm_info, dev);
edac_dbg(1, "Releasing dimm device %s\n", dev_name(dev));
kfree(dimm);
}
static struct device_type dimm_attr_type = {
.groups = dimm_attr_groups,
.release = dimm_attr_release,
};
/* 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 index)
{
int err;
dimm->mci = mci;
dimm->dev.type = &dimm_attr_type;
dimm->dev.bus = mci->bus;
device_initialize(&dimm->dev);
dimm->dev.parent = &mci->dev;
if (mci->csbased)
dev_set_name(&dimm->dev, "rank%d", index);
else
dev_set_name(&dimm->dev, "dimm%d", index);
dev_set_drvdata(&dimm->dev, dimm);
pm_runtime_forbid(&mci->dev);
err = device_add(&dimm->dev);
edac_dbg(0, "creating rank/dimm device %s\n", dev_name(&dimm->dev));
return err;
}
/*
* 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);
int cnt, row, chan, i;
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;
}
cnt = 1;
for (i = 0; i < mci->n_layers; i++) {
cnt *= mci->layers[i].size;
memset(mci->ce_per_layer[i], 0, cnt * sizeof(u32));
memset(mci->ue_per_layer[i], 0, cnt * sizeof(u32));
}
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, "%d\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, "%d\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, "%d\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, "%d\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 i;
char *p = data;
for (i = 0; i < mci->n_layers; i++) {
p += sprintf(p, "%s %d ",
edac_layer_name[mci->layers[i].type],
mci->layers[i].size - 1);
}
return p - data;
}
#ifdef CONFIG_EDAC_DEBUG
static ssize_t edac_fake_inject_write(struct file *file,
const char __user *data,
size_t count, loff_t *ppos)
{
struct device *dev = file->private_data;
struct mem_ctl_info *mci = to_mci(dev);
static enum hw_event_mc_err_type type;
u16 errcount = mci->fake_inject_count;
if (!errcount)
errcount = 1;
type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
: HW_EVENT_ERR_CORRECTED;
printk(KERN_DEBUG
"Generating %d %s fake error%s to %d.%d.%d to test core handling. NOTE: this won't test the driver-specific decoding logic.\n",
errcount,
(type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
errcount > 1 ? "s" : "",
mci->fake_inject_layer[0],
mci->fake_inject_layer[1],
mci->fake_inject_layer[2]
);
edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
mci->fake_inject_layer[0],
mci->fake_inject_layer[1],
mci->fake_inject_layer[2],
"FAKE ERROR", "for EDAC testing only");
return count;
}
static const struct file_operations debug_fake_inject_fops = {
.open = simple_open,
.write = edac_fake_inject_write,
.llseek = generic_file_llseek,
};
#endif
/* 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, NULL, NULL);
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,
NULL
};
static struct attribute_group mci_attr_grp = {
.attrs = mci_attrs,
};
static const struct attribute_group *mci_attr_groups[] = {
&mci_attr_grp,
NULL
};
static void mci_attr_release(struct device *dev)
{
struct mem_ctl_info *mci = container_of(dev, struct mem_ctl_info, dev);
edac_dbg(1, "Releasing csrow device %s\n", dev_name(dev));
kfree(mci);
}
static struct device_type mci_attr_type = {
.groups = mci_attr_groups,
.release = mci_attr_release,
};
#ifdef CONFIG_EDAC_DEBUG
static struct dentry *edac_debugfs;
int __init edac_debugfs_init(void)
{
edac_debugfs = debugfs_create_dir("edac", NULL);
if (IS_ERR(edac_debugfs)) {
edac_debugfs = NULL;
return -ENOMEM;
}
return 0;
}
void __exit edac_debugfs_exit(void)
{
debugfs_remove(edac_debugfs);
}
static int edac_create_debug_nodes(struct mem_ctl_info *mci)
{
struct dentry *d, *parent;
char name[80];
int i;
if (!edac_debugfs)
return -ENODEV;
d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
if (!d)
return -ENOMEM;
parent = d;
for (i = 0; i < mci->n_layers; i++) {
sprintf(name, "fake_inject_%s",
edac_layer_name[mci->layers[i].type]);
d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
&mci->fake_inject_layer[i]);
if (!d)
goto nomem;
}
d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
&mci->fake_inject_ue);
if (!d)
goto nomem;
d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
&mci->fake_inject_count);
if (!d)
goto nomem;
d = debugfs_create_file("fake_inject", S_IWUSR, parent,
&mci->dev,
&debug_fake_inject_fops);
if (!d)
goto nomem;
mci->debugfs = parent;
return 0;
nomem:
debugfs_remove(mci->debugfs);
return -ENOMEM;
}
#endif
/*
* 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)
{
int i, err;
/*
* The memory controller needs its own bus, in order to avoid
* namespace conflicts at /sys/bus/edac.
*/
mci->bus->name = kasprintf(GFP_KERNEL, "mc%d", mci->mc_idx);
if (!mci->bus->name)
return -ENOMEM;
edac_dbg(0, "creating bus %s\n", mci->bus->name);
err = bus_register(mci->bus);
if (err < 0)
goto fail_free_name;
/* get the /sys/devices/system/edac subsys reference */
mci->dev.type = &mci_attr_type;
device_initialize(&mci->dev);
mci->dev.parent = mci_pdev;
mci->dev.bus = mci->bus;
dev_set_name(&mci->dev, "mc%d", mci->mc_idx);