• Mauro Carvalho Chehab's avatar
    edac: add a new per-dimm API and make the old per-virtual-rank API obsolete · 19974710
    Mauro Carvalho Chehab authored
    The old EDAC API is broken. It only works fine for systems manufatured
    before 2005 and for AMD 64. The reason is that it forces all memory
    controller drivers to discover rank info.
    
    Also, it doesn't allow grouping the several ranks into a DIMM.
    
    So, what almost all modern drivers do is to create a fake virtual-rank
    information, and use it to cheat the EDAC core to accept the driver.
    
    While this works if the user has enough time to discover what DIMM slot
    corresponds to each "virtual-rank" information, it prevents EDAC usage
    for users with less available time. It also makes life hard for vendors
    that may want to provide a table with their motherboards to the userspace
    tool (edac-utils) as each driver has its own logic for the virtual
    mapping.
    
    So, the old API should be removed, in favor of a more flexible API that
    allows newer drivers to not lie to the EDAC core.
    Reviewed-by: default avatarAristeu Rozanski <arozansk@redhat.com>
    Cc: Doug Thompson <norsk5@yahoo.com>
    Cc: Borislav Petkov <borislav.petkov@amd.com>
    Cc: Randy Dunlap <rdunlap@xenotime.net>
    Cc: Josh Boyer <jwboyer@redhat.com>
    Cc: Hui Wang <jason77.wang@gmail.com>
    Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
    19974710
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