kernel.git/arch/csky/include/asm/cache.h, branch linux-5.5.yHosts the 0x221E linux distro kernel.
https://git.0xinfinity.dev/distro/kernel.git/atom?h=linux-5.5.y2019-08-06T07:15:34Zcsky: Optimize arch_sync_dma_for_cpu/device with dma_inv_range2019-08-06T07:15:34ZGuo Ren2019-07-30T09:16:28Zurn:sha1:ae76f635d4e1cffa6870cc5472567ca9d6940a22
DMA_FROM_DEVICE only need to read dma data of memory into CPU cache,
so there is no need to clear cache before. Also clear + inv for
DMA_FROM_DEVICE won't cause problem, because the memory range for dma
won't be touched by software during dma working.
Changes for V2:
- Remove clr cache and ignore the DMA_TO_DEVICE in _for_cpu.
- Change inv to wbinv cache with DMA_FROM_DEVICE in _for_device.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>
csky: Cache and TLB routines2018-10-25T15:36:19ZGuo Ren2018-09-05T06:25:10Zurn:sha1:00a9730e1007c6cc87a7c78af2f24a4105d616ee
This patch adds cache and tlb sync codes for abiv1 & abiv2.
Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>