From e39f4ea9b01f137f9e6fa631f3e9088fb9175e91 Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Thu, 29 Mar 2012 12:20:22 -0300 Subject: [PATCH] edac: Only expose csrows/channels on legacy API if they're populated This patch actually fixes a bug with the legacy API, where, at the same csrow, some channels may have different DIMMs. This can happen on FB-DIMM/RAMBUS and modern Intel controllers. This is the case, for example, of Nehalem machines: $ ./edac-ctl --layout +-----------------------------------+ | mc0 | | channel0 | channel1 | channel2 | -------+-----------------------------------+ slot2: | 0 MB | 0 MB | 0 MB | slot1: | 1024 MB | 0 MB | 0 MB | slot0: | 1024 MB | 1024 MB | 1024 MB | -------+-----------------------------------+ Before this patch, non-filled memories were shown. Now, only what's filled is there: grep . /sys/devices/system/edac/mc/mc0/csrow*/ch?* /sys/devices/system/edac/mc/mc0/csrow0/ch0_ce_count:0 /sys/devices/system/edac/mc/mc0/csrow0/ch0_dimm_label:CPU#0Channel#0_DIMM#0 /sys/devices/system/edac/mc/mc0/csrow0/ch1_ce_count:0 /sys/devices/system/edac/mc/mc0/csrow0/ch1_dimm_label:CPU#0Channel#0_DIMM#1 /sys/devices/system/edac/mc/mc0/csrow1/ch0_ce_count:0 /sys/devices/system/edac/mc/mc0/csrow1/ch0_dimm_label:CPU#0Channel#1_DIMM#0 /sys/devices/system/edac/mc/mc0/csrow2/ch0_ce_count:0 /sys/devices/system/edac/mc/mc0/csrow2/ch0_dimm_label:CPU#0Channel#2_DIMM#0 Thanks-to: Aristeu Rozanski Filho Reviewed-by: Aristeu Rozanski Cc: Doug Thompson Signed-off-by: Mauro Carvalho Chehab --- drivers/edac/edac_mc_sysfs.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c index daa418b61525..0f671907c90b 100644 --- a/drivers/edac/edac_mc_sysfs.c +++ b/drivers/edac/edac_mc_sysfs.c @@ -347,6 +347,16 @@ static struct device_attribute *dynamic_csrow_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) @@ -371,6 +381,9 @@ static int edac_create_csrow_object(struct mem_ctl_info *mci, 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) @@ -405,6 +418,9 @@ static int edac_create_csrow_objects(struct mem_ctl_info *mci) 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; @@ -414,7 +430,11 @@ static int edac_create_csrow_objects(struct mem_ctl_info *mci) 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, @@ -433,7 +453,11 @@ static void edac_delete_csrow_objects(struct mem_ctl_info *mci) 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; debugf1("Removing csrow %d channel %d sysfs nodes\n", i, chan); device_remove_file(&csrow->dev, -- GitLab