linux - Linux Kernel (branches are rebased on master from time to time)

Age	Commit message (Collapse)	Author	Files	Lines
2017-10-24	arm64: Avoid aligning normal memory pointers in __memcpy_{to,from}io	Mark Salyzyn	1	-7/+5
	__memcpy_{to,from}io fall back to byte-at-a-time copying if both the source and destination pointers are not 8-byte aligned. Since one of the pointers always points at normal memory, this is unnecessary and detrimental to performance, so only do byte copying until we hit an 8-byte boundary for the device pointer. This change was motivated by performance issues in the pstore driver. On a test platform, measuring probe time for pstore, console buffer size of 1/4MB and pmsg of 1/2MB, was in the 90-107ms region. Change managed to reduce it to 10-25ms, an improvement in boot time. Cc: Kees Cook <keescook@chromium.org> Cc: Anton Vorontsov <anton@enomsg.org> Cc: Tony Luck <tony.luck@intel.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Anton Vorontsov <anton@enomsg.org> Cc: Robin Murphy <robin.murphy@arm.com> Signed-off-by: Mark Salyzyn <salyzyn@android.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
2014-11-06	arm64: optimize memcpy_{from,to}io() and memset_io()	Joonwoo Park	1	-10/+56
	Optimize memcpy_{from,to}io() and memset_io() by transferring in 64 bit as much as possible with minimized barrier usage. This simplest optimization brings faster throughput compare to current byte-by-byte read and write with barrier in the loop. Code's skeleton is taken from the powerpc. Link: http://lkml.kernel.org/p/20141020133304.GH23751@e104818-lin.cambridge.arm.com Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Reviewed-by: Trilok Soni <tsoni@codeaurora.org> Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
2012-09-17	arm64: Device specific operations	Catalin Marinas	1	-0/+64
	This patch adds several definitions for device communication, including I/O accessors and ioremap(). The __raw_* accessors are implemented as inline asm to avoid compiler generation of post-indexed accesses (less efficient to emulate in a virtualised environment). Signed-off-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Acked-by: Olof Johansson <olof@lixom.net> Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>