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authorShannon Nelson <shannon.nelson@intel.com>2007-10-16 01:27:41 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:09 -0700
commit7589670f37736bcc119ebfbd69aafea6d585d1d4 (patch)
tree471f90dda6bcbcd59cc857b4f0130922bba88fc4 /drivers/pci/bus.c
parent3e037454bcfa4b187e8293d2121bd8c0f5a5c31c (diff)
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DCA: Add Direct Cache Access driver
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 <shannon.nelson@intel.com> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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