Messages in this thread | | | Date | Fri, 30 Mar 2012 12:50:48 +0200 | From | Borislav Petkov <> | Subject | Re: [PATCH 01/13] edac: Create a dimm struct and move the labels into it |
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On Thu, Mar 29, 2012 at 01:45:34PM -0300, Mauro Carvalho Chehab wrote: > The way a DIMM is currently represented implies that they're > linked into a per-csrow struct. However, some drivers don't see > csrows, as they're ridden behind some chip like the AMB's > on FBDIMM's, for example. > > This forced drivers to fake a csrow struct, and to create > a mess under csrow/channel original's concept. > > Move the DIMM labels into a per-DIMM struct, and add there > the real location of the socket, in terms of csrow/channel. > Latter patches will modify the location to properly represent the > memory architecture. > > All other drivers will use a per-csrow type of location. > Some of those drivers will require a latter conversion, as > they also fake the csrows internally. > > TODO: While this patch doesn't change the existing behavior, on > csrows-based memory controllers, a csrow/channel pair points to a memory > rank. There's a known bug at the EDAC core that allows having different > labels for the same DIMM, if it has more than one rank. A latter patch > is need to merge the several ranks for a DIMM into the same dimm_info > struct, in order to avoid having different labels for the same DIMM. > > Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com> > --- > drivers/edac/edac_mc.c | 50 +++++++++++++++++++++++++++++++---------- > drivers/edac/edac_mc_sysfs.c | 11 ++++----- > drivers/edac/i5100_edac.c | 8 +++--- > drivers/edac/i7core_edac.c | 4 +- > drivers/edac/i82975x_edac.c | 2 +- > drivers/edac/sb_edac.c | 4 +- > include/linux/edac.h | 28 +++++++++++++++++++---- > 7 files changed, 75 insertions(+), 32 deletions(-) > > diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c > index 690cbf1..c03bfe7 100644 > --- a/drivers/edac/edac_mc.c > +++ b/drivers/edac/edac_mc.c > @@ -44,7 +44,7 @@ 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->ce_count); > - debugf4("\tchannel->label = '%s'\n", chan->label); > + debugf4("\tchannel->label = '%s'\n", chan->dimm->label); > debugf4("\tchannel->csrow = %p\n\n", chan->csrow); > } > > @@ -157,6 +157,7 @@ struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt, unsigned nr_csrows, > struct mem_ctl_info *mci; > struct csrow_info *csi, *csrow; > struct rank_info *chi, *chp, *chan; > + struct dimm_info *dimm; > void *pvt; > unsigned size; > int row, chn; > @@ -170,7 +171,8 @@ struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt, unsigned nr_csrows, > mci = (struct mem_ctl_info *)0; > csi = edac_align_ptr(&mci[1], sizeof(*csi)); > chi = edac_align_ptr(&csi[nr_csrows], sizeof(*chi)); > - pvt = edac_align_ptr(&chi[nr_chans * nr_csrows], sz_pvt); > + dimm = edac_align_ptr(&chi[nr_chans * nr_csrows], sizeof(*dimm)); > + pvt = edac_align_ptr(&dimm[nr_chans * nr_csrows], sz_pvt); > size = ((unsigned long)pvt) + sz_pvt; > > mci = kzalloc(size, GFP_KERNEL); > @@ -182,11 +184,13 @@ struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt, unsigned nr_csrows, > */ > csi = (struct csrow_info *)(((char *)mci) + ((unsigned long)csi)); > chi = (struct rank_info *)(((char *)mci) + ((unsigned long)chi)); > + dimm = (struct dimm_info *)(((char *)mci) + ((unsigned long)dimm)); > pvt = sz_pvt ? (((char *)mci) + ((unsigned long)pvt)) : NULL; > > /* setup index and various internal pointers */ > mci->mc_idx = edac_index; > mci->csrows = csi; > + mci->dimms = dimm; > mci->pvt_info = pvt; > mci->nr_csrows = nr_csrows; > > @@ -205,6 +209,21 @@ struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt, unsigned nr_csrows, > } > } > > + /* > + * By default, assumes that a per-csrow arrangement will be used, > + * as most drivers are based on such assumption. > + */ > + dimm = mci->dimms; > + for (row = 0; row < mci->nr_csrows; row++) { > + for (chn = 0; chn < mci->csrows[row].nr_channels; chn++) { > + mci->csrows[row].channels[chn].dimm = dimm; > + dimm->csrow = row; > + dimm->csrow_channel = chn; > + dimm++; > + mci->nr_dimms++; > + } > + }
There's a double loop above this one which iterates over the same things: rows and then channels in each row. So merge that loop with the one above instead of repeating it here.
-- Regards/Gruss, Boris.
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