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Date: Mon, 30 Apr 2012 12:10:24 -0300
From: Mauro Carvalho Chehab <mchehab@...hat.com>
To: Borislav Petkov <bp@...64.org>
CC: Mauro Carvalho Chehab <mchehab@...hat.com>,
Linux Edac Mailing List <linux-edac@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Doug Thompson <norsk5@...oo.com>, Joe Perches <joe@...ches.com>
Subject: Re: [PATCH v2] edac_mc: Cleanup per-dimm_info debug messages
Em 30-04-2012 12:02, Mauro Carvalho Chehab escreveu:
> The edac_mc_alloc() routine allocates one dimm_info device for all
> possible memories, including the non-filled ones. The debug messages
> there are somewhat confusing. So, cleans them, by moving the code
> that prints the memory location to edac_mc, and using it on both
> edac_mc_sysfs and edac_mc.
>
> After this patch, a dimm-based memory controller will print the debug
> info as:
>
> [ 728.430828] EDAC DEBUG: edac_mc_dump_dimm: dimm2: channel 0 slot 2 mapped as virtual row 0, chan 2
> [ 728.430834] EDAC DEBUG: edac_mc_dump_dimm: dimm->label = 'mc#0channel#0slot#2'
> [ 728.430839] EDAC DEBUG: edac_mc_dump_dimm: dimm->nr_pages = 0x0
> [ 728.430846] EDAC DEBUG: edac_mc_dump_dimm: dimm->grain = 0
> [ 728.430850] EDAC DEBUG: edac_mc_dump_dimm: dimm->nr_pages = 0x0
Hmm... just noticed that, just like the per-csrow register dumps, this routine
is called even when empty memories are used (in this case: nr_pages = 0).
IMHO, as this is a registers dump, the better is to keep it as-is, but it would
be simple to add a test there - and at edac_mc_dump_csrow() - to just dump it
when dimm->nr_pages is not 0.
What do you think?
Regards,
Mauro
>
> (a rank-based memory controller would print, instead, "rank2"
> on the above debug info)
>
> Cc: Doug Thompson <norsk5@...oo.com>
> Cc: Joe Perches <joe@...ches.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
> ---
>
> v2: rebase this patch to apply after:
> http://git.infradead.org/users/mchehab/edac.git/commitdiff/a93f4f2a667afa1ff2f983b12d2062d7259c6c44
> As Joe's patches renamed debugf[0-4] to edac_dbg([0-4], and both patches
> would conflict otherwise.
>
> drivers/edac/edac_mc.c | 44 ++++++++++++++++++++++++++---------------
> drivers/edac/edac_mc_sysfs.c | 11 +---------
> drivers/edac/edac_module.h | 3 ++
> 3 files changed, 32 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
> index f48011f..ecb23e5 100644
> --- a/drivers/edac/edac_mc.c
> +++ b/drivers/edac/edac_mc.c
> @@ -40,6 +40,25 @@
> static DEFINE_MUTEX(mem_ctls_mutex);
> static LIST_HEAD(mc_devices);
>
> +unsigned edac_dimm_info_location(struct dimm_info *dimm, char *buf,
> + int len)
> +{
> + struct mem_ctl_info *mci = dimm->mci;
> + int i, n, count = 0;
> + char *p = buf;
> +
> + for (i = 0; i < mci->n_layers; i++) {
> + n = snprintf(p, len, "%s %d ",
> + edac_layer_name[mci->layers[i].type],
> + dimm->location[i]);
> + p += n;
> + len -= n;
> + count += n;
> + }
> +
> + return count;
> +}
> +
> #ifdef CONFIG_EDAC_DEBUG
>
> static void edac_mc_dump_channel(struct rank_info *chan)
> @@ -50,20 +69,19 @@ static void edac_mc_dump_channel(struct rank_info *chan)
> edac_dbg(4, "\tchannel->dimm = %p\n", chan->dimm);
> }
>
> -static void edac_mc_dump_dimm(struct dimm_info *dimm)
> +static void edac_mc_dump_dimm(struct dimm_info *dimm, int number)
> {
> - int i;
> + char location[80];
> +
> + edac_dimm_info_location(dimm, location, sizeof(location));
>
> edac_dbg(4, "\tdimm = %p\n", dimm);
> + edac_dbg(4, "\tdimm = %p\n", dimm);
> + edac_dbg(4, "\t%s%i: %smapped as virtual row %d, chan %d\n",
> + dimm->mci->mem_is_per_rank ? "rank" : "dimm",
> + number, location, dimm->csrow, dimm->cschannel);
> edac_dbg(4, "\tdimm->label = '%s'\n", dimm->label);
> edac_dbg(4, "\tdimm->nr_pages = 0x%x\n", dimm->nr_pages);
> - edac_dbg(4, "\tdimm location ");
> - for (i = 0; i < dimm->mci->n_layers; i++) {
> - printk(KERN_CONT "%d", dimm->location[i]);
> - if (i < dimm->mci->n_layers - 1)
> - printk(KERN_CONT ".");
> - }
> - printk(KERN_CONT "\n");
> edac_dbg(4, "\tdimm->grain = %d\n", dimm->grain);
> edac_dbg(4, "\tdimm->nr_pages = 0x%x\n", dimm->nr_pages);
> }
> @@ -338,8 +356,6 @@ struct mem_ctl_info *edac_mc_alloc(unsigned edac_index,
> memset(&pos, 0, sizeof(pos));
> row = 0;
> chn = 0;
> - edac_dbg(4, "initializing %d %s\n",
> - tot_dimms, per_rank ? "ranks" : "dimms");
> for (i = 0; i < tot_dimms; i++) {
> chan = mci->csrows[row]->channels[chn];
> off = EDAC_DIMM_OFF(layer, n_layers, pos[0], pos[1], pos[2]);
> @@ -352,10 +368,6 @@ struct mem_ctl_info *edac_mc_alloc(unsigned edac_index,
> mci->dimms[off] = dimm;
> dimm->mci = mci;
>
> - edac_dbg(2, "%d: %s%i (%d:%d:%d): row %d, chan %d\n",
> - i, per_rank ? "rank" : "dimm", off,
> - pos[0], pos[1], pos[2], row, chn);
> -
> /*
> * Copy DIMM location and initialize the memory location
> */
> @@ -731,7 +743,7 @@ int edac_mc_add_mc(struct mem_ctl_info *mci)
> edac_mc_dump_channel(mci->csrows[i]->channels[j]);
> }
> for (i = 0; i < mci->tot_dimms; i++)
> - edac_mc_dump_dimm(mci->dimms[i]);
> + edac_mc_dump_dimm(mci->dimms[i], i);
> }
> #endif
> mutex_lock(&mem_ctls_mutex);
> diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
> index fe2d922..95865a0 100644
> --- a/drivers/edac/edac_mc_sysfs.c
> +++ b/drivers/edac/edac_mc_sysfs.c
> @@ -485,17 +485,8 @@ static ssize_t dimmdev_location_show(struct device *dev,
> struct device_attribute *mattr, char *data)
> {
> struct dimm_info *dimm = to_dimm(dev);
> - struct mem_ctl_info *mci = dimm->mci;
> - 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],
> - dimm->location[i]);
> - }
>
> - return p - data;
> + return edac_dimm_info_location(dimm, data, PAGE_SIZE);
> }
>
> static ssize_t dimmdev_label_show(struct device *dev,
> diff --git a/drivers/edac/edac_module.h b/drivers/edac/edac_module.h
> index 1af1367..de92756 100644
> --- a/drivers/edac/edac_module.h
> +++ b/drivers/edac/edac_module.h
> @@ -34,6 +34,9 @@ extern int edac_mc_get_panic_on_ue(void);
> extern int edac_get_poll_msec(void);
> extern int edac_mc_get_poll_msec(void);
>
> +unsigned edac_dimm_info_location(struct dimm_info *dimm, char *buf,
> + int len);
> +
> /* on edac_device.c */
> extern int edac_device_register_sysfs_main_kobj(
> struct edac_device_ctl_info *edac_dev);
--
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