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authorMauro Carvalho Chehab <mchehab@redhat.com>2012-10-24 16:30:01 +0400
committerMauro Carvalho Chehab <mchehab@redhat.com>2012-10-25 13:17:18 +0400
commit24bef66e74d647aebd34e0bef7693512b7912029 (patch)
treeba8c0018022349ba3c9ca2f6deb414df96cc288d /drivers/edac
parent479696840239e0cc43efb3c917bdcad2174d2215 (diff)
downloadlinux-24bef66e74d647aebd34e0bef7693512b7912029.tar.xz
edac: Fix the dimm filling for csrows-based layouts
The driver is currently filling data in a wrong way, on drivers for csrows-based memory controller, when the first layer is a csrow. This is not easily to notice, as, in general, memories are filed in dual, interleaved, symetric mode, as very few memory controllers support asymetric modes. While digging into a bug for i82795_edac driver, the asymetric mode there is now working, allowing us to fill the machine with 4x1GB ranks at channel 0, and 2x512GB at channel 1: Channel 0 ranks: EDAC DEBUG: i82975x_init_csrows: DIMM A0: from page 0x00000000 to 0x0003ffff (size: 0x00040000 pages) EDAC DEBUG: i82975x_init_csrows: DIMM A1: from page 0x00040000 to 0x0007ffff (size: 0x00040000 pages) EDAC DEBUG: i82975x_init_csrows: DIMM A2: from page 0x00080000 to 0x000bffff (size: 0x00040000 pages) EDAC DEBUG: i82975x_init_csrows: DIMM A3: from page 0x000c0000 to 0x000fffff (size: 0x00040000 pages) Channel 1 ranks: EDAC DEBUG: i82975x_init_csrows: DIMM B0: from page 0x00100000 to 0x0011ffff (size: 0x00020000 pages) EDAC DEBUG: i82975x_init_csrows: DIMM B1: from page 0x00120000 to 0x0013ffff (size: 0x00020000 pages) Instead of properly showing the memories as such, before this patch, it shows the memory layout as: +-----------------------------------+ | mc0 | | csrow0 | csrow1 | csrow2 | ----------+-----------------------------------+ channel1: | 1024 MB | 1024 MB | 512 MB | channel0: | 1024 MB | 1024 MB | 512 MB | ----------+-----------------------------------+ as if both channels were symetric, grouping the DIMMs on a wrong layout. After this patch, the memory is correctly represented. So, for csrows at layers[0], it shows: +-----------------------------------------------+ | mc0 | | csrow0 | csrow1 | csrow2 | csrow3 | ----------+-----------------------------------------------+ channel1: | 512 MB | 512 MB | 0 MB | 0 MB | channel0: | 1024 MB | 1024 MB | 1024 MB | 1024 MB | ----------+-----------------------------------------------+ For csrows at layers[1], it shows: +-----------------------+ | mc0 | | channel0 | channel1 | --------+-----------------------+ csrow3: | 1024 MB | 0 MB | csrow2: | 1024 MB | 0 MB | --------+-----------------------+ csrow1: | 1024 MB | 512 MB | csrow0: | 1024 MB | 512 MB | --------+-----------------------+ So, no matter of what comes first, the information between channel and csrow will be properly represented. Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/edac')
-rw-r--r--drivers/edac/edac_mc.c14
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index d5dc9da7f99f..81eb9fd3f717 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -416,10 +416,18 @@ struct mem_ctl_info *edac_mc_alloc(unsigned mc_num,
dimm->cschannel = chn;
/* Increment csrow location */
- row++;
- if (row == tot_csrows) {
- row = 0;
+ if (layers[0].is_virt_csrow) {
chn++;
+ if (chn == tot_channels) {
+ chn = 0;
+ row++;
+ }
+ } else {
+ row++;
+ if (row == tot_csrows) {
+ row = 0;
+ chn++;
+ }
}
/* Increment dimm location */