static DEFINE_MUTEX(mem_ctls_mutex);
static LIST_HEAD(mc_devices);
+/*
+ * Used to lock EDAC MC to just one module, avoiding two drivers e. g.
+ * apei/ghes and i7core_edac to be used at the same time.
+ */
+static void const *edac_mc_owner;
+
unsigned edac_dimm_info_location(struct dimm_info *dimm, char *buf,
unsigned len)
{
mci->op_state = OP_ALLOC;
- /* at this point, the root kobj is valid, and in order to
- * 'free' the object, then the function:
- * edac_mc_unregister_sysfs_main_kobj() must be called
- * which will perform kobj unregistration and the actual free
- * will occur during the kobject callback operation
- */
-
return mci;
error:
return 1;
}
-static void del_mc_from_global_list(struct mem_ctl_info *mci)
+static int del_mc_from_global_list(struct mem_ctl_info *mci)
{
- atomic_dec(&edac_handlers);
+ int handlers = atomic_dec_return(&edac_handlers);
list_del_rcu(&mci->link);
/* these are for safe removal of devices from global list while
*/
synchronize_rcu();
INIT_LIST_HEAD(&mci->link);
+
+ return handlers;
}
/**
/* FIXME - should a warning be printed if no error detection? correction? */
int edac_mc_add_mc(struct mem_ctl_info *mci)
{
+ int ret = -EINVAL;
edac_dbg(0, "\n");
#ifdef CONFIG_EDAC_DEBUG
#endif
mutex_lock(&mem_ctls_mutex);
+ if (edac_mc_owner && edac_mc_owner != mci->mod_name) {
+ ret = -EPERM;
+ goto fail0;
+ }
+
if (add_mc_to_global_list(mci))
goto fail0;
edac_mc_printk(mci, KERN_INFO, "Giving out device to '%s' '%s':"
" DEV %s\n", mci->mod_name, mci->ctl_name, edac_dev_name(mci));
+ edac_mc_owner = mci->mod_name;
+
mutex_unlock(&mem_ctls_mutex);
return 0;
fail0:
mutex_unlock(&mem_ctls_mutex);
- return 1;
+ return ret;
}
EXPORT_SYMBOL_GPL(edac_mc_add_mc);
return NULL;
}
- del_mc_from_global_list(mci);
+ if (!del_mc_from_global_list(mci))
+ edac_mc_owner = NULL;
mutex_unlock(&mem_ctls_mutex);
/* flush workq processes */
[EDAC_MC_LAYER_CHANNEL] = "channel",
[EDAC_MC_LAYER_SLOT] = "slot",
[EDAC_MC_LAYER_CHIP_SELECT] = "csrow",
+ [EDAC_MC_LAYER_ALL_MEM] = "memory",
};
EXPORT_SYMBOL_GPL(edac_layer_name);
edac_inc_ue_error(mci, enable_per_layer_report, pos, error_count);
}
-#define OTHER_LABEL " or "
+/**
+ * edac_raw_mc_handle_error - reports a memory event to userspace without doing
+ * anything to discover the error location
+ *
+ * @type: severity of the error (CE/UE/Fatal)
+ * @mci: a struct mem_ctl_info pointer
+ * @e: error description
+ *
+ * This raw function is used internally by edac_mc_handle_error(). It should
+ * only be called directly when the hardware error come directly from BIOS,
+ * like in the case of APEI GHES driver.
+ */
+void edac_raw_mc_handle_error(const enum hw_event_mc_err_type type,
+ struct mem_ctl_info *mci,
+ struct edac_raw_error_desc *e)
+{
+ char detail[80];
+ int pos[EDAC_MAX_LAYERS] = { e->top_layer, e->mid_layer, e->low_layer };
+
+ /* Memory type dependent details about the error */
+ if (type == HW_EVENT_ERR_CORRECTED) {
+ snprintf(detail, sizeof(detail),
+ "page:0x%lx offset:0x%lx grain:%ld syndrome:0x%lx",
+ e->page_frame_number, e->offset_in_page,
+ e->grain, e->syndrome);
+ edac_ce_error(mci, e->error_count, pos, e->msg, e->location, e->label,
+ detail, e->other_detail, e->enable_per_layer_report,
+ e->page_frame_number, e->offset_in_page, e->grain);
+ } else {
+ snprintf(detail, sizeof(detail),
+ "page:0x%lx offset:0x%lx grain:%ld",
+ e->page_frame_number, e->offset_in_page, e->grain);
+
+ edac_ue_error(mci, e->error_count, pos, e->msg, e->location, e->label,
+ detail, e->other_detail, e->enable_per_layer_report);
+ }
+
+
+}
+EXPORT_SYMBOL_GPL(edac_raw_mc_handle_error);
/**
* edac_mc_handle_error - reports a memory event to userspace
const char *msg,
const char *other_detail)
{
- /* FIXME: too much for stack: move it to some pre-alocated area */
- char detail[80], location[80];
- char label[(EDAC_MC_LABEL_LEN + 1 + sizeof(OTHER_LABEL)) * mci->tot_dimms];
char *p;
int row = -1, chan = -1;
int pos[EDAC_MAX_LAYERS] = { top_layer, mid_layer, low_layer };
- int i;
- long grain;
- bool enable_per_layer_report = false;
+ int i, n_labels = 0;
u8 grain_bits;
+ struct edac_raw_error_desc *e = &mci->error_desc;
edac_dbg(3, "MC%d\n", mci->mc_idx);
+ /* Fills the error report buffer */
+ memset(e, 0, sizeof (*e));
+ e->error_count = error_count;
+ e->top_layer = top_layer;
+ e->mid_layer = mid_layer;
+ e->low_layer = low_layer;
+ e->page_frame_number = page_frame_number;
+ e->offset_in_page = offset_in_page;
+ e->syndrome = syndrome;
+ e->msg = msg;
+ e->other_detail = other_detail;
+
/*
* Check if the event report is consistent and if the memory
* location is known. If it is known, enable_per_layer_report will be
pos[i] = -1;
}
if (pos[i] >= 0)
- enable_per_layer_report = true;
+ e->enable_per_layer_report = true;
}
/*
* where each memory belongs to a separate channel within the same
* branch.
*/
- grain = 0;
- p = label;
+ p = e->label;
*p = '\0';
for (i = 0; i < mci->tot_dimms; i++) {
continue;
/* get the max grain, over the error match range */
- if (dimm->grain > grain)
- grain = dimm->grain;
+ if (dimm->grain > e->grain)
+ e->grain = dimm->grain;
/*
* If the error is memory-controller wide, there's no need to
* channel/memory controller/... may be affected.
* Also, don't show errors for empty DIMM slots.
*/
- if (enable_per_layer_report && dimm->nr_pages) {
- if (p != label) {
+ if (e->enable_per_layer_report && dimm->nr_pages) {
+ if (n_labels >= EDAC_MAX_LABELS) {
+ e->enable_per_layer_report = false;
+ break;
+ }
+ n_labels++;
+ if (p != e->label) {
strcpy(p, OTHER_LABEL);
p += strlen(OTHER_LABEL);
}
}
}
- if (!enable_per_layer_report) {
- strcpy(label, "any memory");
+ if (!e->enable_per_layer_report) {
+ strcpy(e->label, "any memory");
} else {
edac_dbg(4, "csrow/channel to increment: (%d,%d)\n", row, chan);
- if (p == label)
- strcpy(label, "unknown memory");
+ if (p == e->label)
+ strcpy(e->label, "unknown memory");
if (type == HW_EVENT_ERR_CORRECTED) {
if (row >= 0) {
mci->csrows[row]->ce_count += error_count;
}
/* Fill the RAM location data */
- p = location;
+ p = e->location;
for (i = 0; i < mci->n_layers; i++) {
if (pos[i] < 0)
edac_layer_name[mci->layers[i].type],
pos[i]);
}
- if (p > location)
+ if (p > e->location)
*(p - 1) = '\0';
/* Report the error via the trace interface */
- grain_bits = fls_long(grain) + 1;
- trace_mc_event(type, msg, label, error_count,
- mci->mc_idx, top_layer, mid_layer, low_layer,
- PAGES_TO_MiB(page_frame_number) | offset_in_page,
- grain_bits, syndrome, other_detail);
+ grain_bits = fls_long(e->grain) + 1;
+ trace_mc_event(type, e->msg, e->label, e->error_count,
+ mci->mc_idx, e->top_layer, e->mid_layer, e->low_layer,
+ PAGES_TO_MiB(e->page_frame_number) | e->offset_in_page,
+ grain_bits, e->syndrome, e->other_detail);
- /* Memory type dependent details about the error */
- if (type == HW_EVENT_ERR_CORRECTED) {
- snprintf(detail, sizeof(detail),
- "page:0x%lx offset:0x%lx grain:%ld syndrome:0x%lx",
- page_frame_number, offset_in_page,
- grain, syndrome);
- edac_ce_error(mci, error_count, pos, msg, location, label,
- detail, other_detail, enable_per_layer_report,
- page_frame_number, offset_in_page, grain);
- } else {
- snprintf(detail, sizeof(detail),
- "page:0x%lx offset:0x%lx grain:%ld",
- page_frame_number, offset_in_page, grain);
-
- edac_ue_error(mci, error_count, pos, msg, location, label,
- detail, other_detail, enable_per_layer_report);
- }
+ edac_raw_mc_handle_error(type, mci, e);
}
EXPORT_SYMBOL_GPL(edac_mc_handle_error);
projects / ~andy / linux / blobdiff