1. 07 Jun, 2009 1 commit
  2. 12 May, 2009 1 commit
    • Dmitry Adamushko's avatar
      x86: microcode: use smp_call_function_single instead of set_cpus_allowed,... · 871b72dd
      Dmitry Adamushko authored
      x86: microcode: use smp_call_function_single instead of set_cpus_allowed, cleanup of synchronization logic
      * Solve issues described in 6f66cbc6
        in a way that doesn't resort to set_cpus_allowed();
      * in fact, only collect_cpu_info and apply_microcode callbacks
        must run on a target cpu, others will do just fine on any other.
        smp_call_function_single() (as suggested by Ingo) is used to run
        these callbacks on a target cpu.
      * cleanup of synchronization logic of the 'microcode_core' part
        The generic 'microcode_core' part guarantees that only a single cpu
        (be it a full-fledged cpu, one of the cores or HT)
        is being updated at any particular moment of time.
        In general, there is no need for any additional sync. mechanism in
        arch-specific parts (the patch removes existing spinlocks).
        See also the "Synchronization" section in microcode_core.c.
      * return -EINVAL instead of -1 (which is translated into -EPERM) in
        microcode_write(), reload_cpu() and mc_sysdev_add(). Other suggestions
        for an error code?
      * use 'enum ucode_state' as return value of request_microcode_{fw, user}
        to gain more flexibility by distinguishing between real error cases
        and situations when an appropriate ucode was not found (which is not an
        error per-se).
      * some minor cleanups
      Thanks a lot to Hugh Dickins for review/suggestions/testing!
         Reference: http://marc.info/?l=linux-kernel&m=124025889012541&w=2
      [ Impact: refactor and clean up microcode driver locking code ]
      Signed-off-by: default avatarDmitry Adamushko <dmitry.adamushko@gmail.com>
      Acked-by: default avatarHugh Dickins <hugh@veritas.com>
      Cc: Andrew Morton <akpm@linux-foundation.org>
      Cc: Rusty Russell <rusty@rustcorp.com.au>
      Cc: Andreas Herrmann <andreas.herrmann3@amd.com>
      Cc: Peter Oruba <peter.oruba@amd.com>
      Cc: Arjan van de Ven <arjan@infradead.org>
      LKML-Reference: <1242078507.5560.9.camel@earth>
      [ did some more cleanups ]
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
       arch/x86/include/asm/microcode.h  |   25 ++
       arch/x86/kernel/microcode_amd.c   |   58 ++----
       arch/x86/kernel/microcode_core.c  |  326 +++++++++++++++++++++-----------------
       arch/x86/kernel/microcode_intel.c |   92 +++-------
       4 files changed, 261 insertions(+), 240 deletions(-)
      (~20 new comment lines)
  3. 10 May, 2009 12 commits
  4. 09 May, 2009 26 commits