17 Oct, 2007

2 commits

• 2ed6dc34f   I/OAT: Add DCA services ... Browse Code »

  Add code to connect to the DCA driver and provide cpu tags for use by
  drivers that would like to use Direct Cache Access hints.

  [Adrian Bunk] Several Kconfig cleanup items
  [Andrew Morten, Chris Leech] Fix for using cpu_physical_id() even when
  built for uni-processor

  Signed-off-by: Shannon Nelson
  Acked-by: David S. Miller
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  Shannon Nelson

  2007-10-17 00:43:09 +0800  
• 7589670f3   DCA: Add Direct Cache Access driver ... Browse Code »

  Direct Cache Access (DCA) is a method for warming the CPU cache before data
  is used, with the intent of lessening the impact of cache misses. This
  patch adds a manager and interface for matching up client requests for DCA
  services with devices that offer DCA services.

  In order to use DCA, a module must do bus writes with the appropriate tag
  bits set to trigger a cache read for a specific CPU. However, different
  CPUs and chipsets can require different sets of tag bits, and the methods
  for determining the correct bits may be simple hardcoding or may be a
  hardware specific magic incantation. This interface is a way for DCA
  clients to find the correct tag bits for the targeted CPU without needing
  to know the specifics.

  [Dave Miller] use DEFINE_SPINLOCK()

  Signed-off-by: Shannon Nelson
  Acked-by: David S. Miller
  Signed-off-by: Andrew Morton
  Signed-off-by: Linus Torvalds

  Shannon Nelson

  2007-10-17 00:43:09 +0800