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Date: Mon, 2 Apr 2012 15:18:40 +0200
From: Borislav Petkov <bp@...64.org>
To: Mauro Carvalho Chehab <mchehab@...hat.com>
Cc: Linux Edac Mailing List <linux-edac@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 04/13] edac: move nr_pages to dimm struct
On Thu, Mar 29, 2012 at 01:45:37PM -0300, Mauro Carvalho Chehab wrote:
> The number of pages is a dimm property. Move it to the dimm struct.
>
> After this change, it is possible to add sysfs nodes for the DIMM's that
DIMMs
> will properly represent the DIMM stick properties, including its size.
>
> A TODO fix here is to properly represent dual-rank/quad-rank DIMMs when
> the memory controller represents the memory via chip select rows.
>
> Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
> ---
> drivers/edac/amd64_edac.c | 13 ++++------
> drivers/edac/amd76x_edac.c | 6 ++--
> drivers/edac/cell_edac.c | 8 ++++--
> drivers/edac/cpc925_edac.c | 8 ++++--
> drivers/edac/e752x_edac.c | 6 +++-
> drivers/edac/e7xxx_edac.c | 5 ++-
> drivers/edac/edac_mc.c | 28 ++++++++++++---------
> drivers/edac/edac_mc_sysfs.c | 52 ++++++++++++++++++++++++++++++----------
> drivers/edac/i3000_edac.c | 6 +++-
> drivers/edac/i3200_edac.c | 3 +-
> drivers/edac/i5000_edac.c | 14 ++++++----
> drivers/edac/i5100_edac.c | 22 ++++++++++-------
> drivers/edac/i5400_edac.c | 9 ++----
> drivers/edac/i7300_edac.c | 22 ++++------------
> drivers/edac/i7core_edac.c | 10 ++-----
> drivers/edac/i82443bxgx_edac.c | 2 +-
> drivers/edac/i82860_edac.c | 2 +-
> drivers/edac/i82875p_edac.c | 5 ++-
> drivers/edac/i82975x_edac.c | 11 ++++++--
> drivers/edac/mpc85xx_edac.c | 3 +-
> drivers/edac/mv64x60_edac.c | 3 +-
> drivers/edac/pasemi_edac.c | 14 +++++-----
> drivers/edac/ppc4xx_edac.c | 5 ++-
> drivers/edac/r82600_edac.c | 3 +-
> drivers/edac/sb_edac.c | 8 +----
> drivers/edac/tile_edac.c | 2 +-
> drivers/edac/x38_edac.c | 4 +-
> include/linux/edac.h | 10 ++++---
> 28 files changed, 158 insertions(+), 126 deletions(-)
>
> diff --git a/drivers/edac/amd64_edac.c b/drivers/edac/amd64_edac.c
> index b1b1551..ad0376e 100644
> --- a/drivers/edac/amd64_edac.c
> +++ b/drivers/edac/amd64_edac.c
> @@ -2126,12 +2126,6 @@ static u32 amd64_csrow_nr_pages(struct amd64_pvt *pvt, u8 dct, int csrow_nr)
>
> nr_pages = pvt->ops->dbam_to_cs(pvt, dct, cs_mode) << (20 - PAGE_SHIFT);
>
> - /*
> - * If dual channel then double the memory size of single channel.
> - * Channel count is 1 or 2
> - */
> - nr_pages <<= (pvt->channel_count - 1);
> -
> debugf0(" (csrow=%d) DBAM map index= %d\n", csrow_nr, cs_mode);
> debugf0(" nr_pages= %u channel-count = %d\n",
> nr_pages, pvt->channel_count);
> @@ -2152,6 +2146,7 @@ static int init_csrows(struct mem_ctl_info *mci)
> int i, j, empty = 1;
> enum mem_type mtype;
> enum edac_type edac_mode;
> + int nr_pages;
>
> amd64_read_pci_cfg(pvt->F3, NBCFG, &val);
>
> @@ -2174,7 +2169,7 @@ static int init_csrows(struct mem_ctl_info *mci)
> i, pvt->mc_node_id);
>
> empty = 0;
> - csrow->nr_pages = amd64_csrow_nr_pages(pvt, 0, i);
> + nr_pages = amd64_csrow_nr_pages(pvt, 0, i);
> get_cs_base_and_mask(pvt, i, 0, &base, &mask);
> /* 8 bytes of resolution */
>
> @@ -2192,10 +2187,12 @@ static int init_csrows(struct mem_ctl_info *mci)
> for (j = 0; j < pvt->channel_count; j++) {
> csrow->channels[j].dimm->mtype = mtype;
> csrow->channels[j].dimm->edac_mode = edac_mode;
> + csrow->channels[j].dimm->nr_pages = nr_pages;
> +
One newline too many.
> }
>
> debugf1(" for MC node %d csrow %d:\n", pvt->mc_node_id, i);
> - debugf1(" nr_pages: %u\n", csrow->nr_pages);
> + debugf1(" nr_pages: %u\n", nr_pages);
> }
>
> return empty;
<snip>
> diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
> index 2430ddb..02263c3 100644
> --- a/drivers/edac/edac_mc.c
> +++ b/drivers/edac/edac_mc.c
> @@ -43,22 +43,22 @@ static void edac_mc_dump_channel(struct rank_info *chan)
> {
> debugf4("\tchannel = %p\n", chan);
> debugf4("\tchannel->chan_idx = %d\n", chan->chan_idx);
> - debugf4("\tchannel->ce_count = %d\n", chan->dimm->ce_count);
> - debugf4("\tchannel->label = '%s'\n", chan->dimm->label);
> debugf4("\tchannel->csrow = %p\n\n", chan->csrow);
> + debugf4("\tdimm->ce_count = %d\n", chan->dimm->ce_count);
> + debugf4("\tdimm->label = '%s'\n", chan->dimm->label);
> + debugf4("\tdimm->nr_pages = 0x%x\n", chan->dimm->nr_pages);
> }
>
> static 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);
> + 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);
Useless code churn: simply remove the ->nr_pages line.
> }
>
> static void edac_mc_dump_mci(struct mem_ctl_info *mci)
> @@ -655,15 +655,19 @@ static void edac_mc_scrub_block(unsigned long page, unsigned long offset,
> int edac_mc_find_csrow_by_page(struct mem_ctl_info *mci, unsigned long page)
> {
> struct csrow_info *csrows = mci->csrows;
> - int row, i;
> + int row, i, j, n;
>
> 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)
> + n = 0;
> + for (j = 0; j < csrow->nr_channels; j++) {
> + struct dimm_info *dimm = csrow->channels[j].dimm;
> + n += dimm->nr_pages;
> + }
> + if (n == 0)
> continue;
>
> debugf3("MC%d: %s(): first(0x%lx) page(0x%lx) last(0x%lx) "
> @@ -672,9 +676,9 @@ int edac_mc_find_csrow_by_page(struct mem_ctl_info *mci, unsigned long page)
> csrow->page_mask);
>
> if ((page >= csrow->first_page) &&
> - (page <= csrow->last_page) &&
> - ((page & csrow->page_mask) ==
> - (csrow->first_page & csrow->page_mask))) {
> + (page <= csrow->last_page) &&
> + ((page & csrow->page_mask) ==
> + (csrow->first_page & csrow->page_mask))) {
Useless and wrong formatting change, please retain the original formatting.
> row = i;
> break;
> }
> diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
> index d63904e..52c56cf 100644
> --- a/drivers/edac/edac_mc_sysfs.c
> +++ b/drivers/edac/edac_mc_sysfs.c
> @@ -144,7 +144,13 @@ static ssize_t csrow_ce_count_show(struct csrow_info *csrow, char *data,
> 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));
> + 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 csrow_info *csrow, char *data,
> @@ -519,16 +525,17 @@ static ssize_t mci_ctl_name_show(struct mem_ctl_info *mci, char *data)
>
> static ssize_t mci_size_mb_show(struct mem_ctl_info *mci, char *data)
> {
> - int total_pages, csrow_idx;
> + int total_pages, csrow_idx, j;
>
> for (total_pages = csrow_idx = 0; csrow_idx < mci->nr_csrows;
> - csrow_idx++) {
> + csrow_idx++) {
You can do the total_pages initialization in the declaration above and
thus don't have to break the loop across two lines:
int total_pages = 0;
...
for (csrow_idx = 0; csrow_idx < mci->nr_csrows; csrow_idx++) {
...
> struct csrow_info *csrow = &mci->csrows[csrow_idx];
>
> - if (!csrow->nr_pages)
> - continue;
> + for (j = 0; j < csrow->nr_channels; j++) {
> + struct dimm_info *dimm = csrow->channels[j].dimm;
>
> - total_pages += csrow->nr_pages;
> + total_pages += dimm->nr_pages;
> + }
> }
>
> return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
> @@ -900,7 +907,7 @@ static void edac_remove_mci_instance_attributes(struct mem_ctl_info *mci,
> */
> int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
> {
> - int i;
> + int i, j;
> int err;
> struct csrow_info *csrow;
> struct kobject *kobj_mci = &mci->edac_mci_kobj;
> @@ -934,10 +941,15 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
> /* Make directories for each CSROW object under the mc<id> kobject
> */
> for (i = 0; i < mci->nr_csrows; i++) {
> + int n = 0;
Let's call this variable with a bit more descriptive name like
'nr_pages' or 'pages_total' or whatever but not simply n.
> +
> csrow = &mci->csrows[i];
> + for (j = 0; j < csrow->nr_channels; j++) {
> + struct dimm_info *dimm = csrow->channels[j].dimm;
> + n += dimm->nr_pages;
> + }
Btw, you can make the loop a single-statement one and drop the curly
braces like so:
for (j = 0; j < csrow->nr_channels; j++)
nr_pages += csrow->channels[j].dimm->nr_pages;
The same applies for all the other occurrences of when you iterate over
the channels, accumulating the pages per dimm.
>
> - /* Only expose populated CSROWs */
> - if (csrow->nr_pages > 0) {
> + if (n > 0) {
> err = edac_create_csrow_object(mci, csrow, i);
> if (err) {
> debugf1("%s() failure: create csrow %d obj\n",
> @@ -949,10 +961,16 @@ int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
>
> return 0;
>
> - /* CSROW error: backout what has already been registered, */
> fail1:
> for (i--; i >= 0; i--) {
> - if (mci->csrows[i].nr_pages > 0)
> + int n = 0;
ditto.
> +
> + csrow = &mci->csrows[i];
> + for (j = 0; j < csrow->nr_channels; j++) {
> + struct dimm_info *dimm = csrow->channels[j].dimm;
> + n += dimm->nr_pages;
> + }
> + if (n > 0)
> kobject_put(&mci->csrows[i].kobj);
> }
>
> @@ -972,14 +990,22 @@ fail0:
> */
> void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
> {
> - int i;
> + struct csrow_info *csrow;
> + int i, j;
>
> debugf0("%s()\n", __func__);
>
> /* remove all csrow kobjects */
> debugf4("%s() unregister this mci kobj\n", __func__);
> for (i = 0; i < mci->nr_csrows; i++) {
> - if (mci->csrows[i].nr_pages > 0) {
> + int n = 0;
ditto.
> +
> + csrow = &mci->csrows[i];
> + for (j = 0; j < csrow->nr_channels; j++) {
> + struct dimm_info *dimm = csrow->channels[j].dimm;
> + n += dimm->nr_pages;
> + }
> + if (n > 0) {
> debugf0("%s() unreg csrow-%d\n", __func__, i);
> kobject_put(&mci->csrows[i].kobj);
> }
<snip>
> diff --git a/include/linux/edac.h b/include/linux/edac.h
> index 5244193..de22d4c 100644
> --- a/include/linux/edac.h
> +++ b/include/linux/edac.h
> @@ -320,6 +320,8 @@ struct dimm_info {
> enum mem_type mtype; /* memory dimm type */
> enum edac_type edac_mode; /* EDAC mode for this dimm */
>
> + u32 nr_pages; /* number of pages in csrow */
> +
> u32 ce_count; /* Correctable Errors for this dimm */
> };
>
> @@ -346,13 +348,13 @@ struct rank_info {
> };
>
> struct csrow_info {
> + int csrow_idx; /* the chip-select row */
> +
> + /* Used only by edac_mc_find_csrow_by_page() */
> unsigned long first_page; /* first page number in csrow */
> unsigned long last_page; /* last page number in csrow */
> - u32 nr_pages; /* number of pages in csrow */
> unsigned long page_mask; /* used for interleaving -
> - * 0UL for non intlv
> - */
> - int csrow_idx; /* the chip-select row */
> + * 0UL for non intlv */
Useless moving of code around.
>
> u32 ue_count; /* Uncorrectable Errors for this csrow */
> u32 ce_count; /* Correctable Errors for this csrow */
> --
> 1.7.8
--
Regards/Gruss,
Boris.
Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
GM: Alberto Bozzo
Reg: Dornach, Landkreis Muenchen
HRB Nr. 43632 WEEE Registernr: 129 19551
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