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DCA: Add Direct Cache Access driver

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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 <[email protected]>
Acked-by: David S. Miller <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Shannon Nelson 2007-10-16 01:27:41 -07:00 • committed by Linus Torvalds
commit 7589670f37
7 changed files with 351 additions and 0 deletions
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drivers/Kconfig
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@ -84,6 +84,8 @@ source "drivers/rtc/Kconfig"
source "drivers/dma/Kconfig"
source "drivers/dca/Kconfig"
source "drivers/auxdisplay/Kconfig"
source "drivers/kvm/Kconfig"