csky: Fixup defer cache flush for 610

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We use defer cache flush mechanism to improve the performance of
610, but the implementation is wrong. We fix it up now and update
the mechanism:

 - Zero page needn't be flushed.
 - If page is file mapping & non-touched in user space, defer flush.
 - If page is anon mapping or dirty file mapping, flush immediately.
 - In update_mmu_cache finish the defer flush by flush_dcache_page().

For 610 we need take care the dcache aliasing issue:
 - VIPT cache with 8K-bytes size per way in 4K page granularity.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>

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This commit is contained in:

Guo Ren 2019-08-20 12:47:24 +08:00

parent be819aa6f1

commit dc140045c0

2 changed files with 29 additions and 25 deletions

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50

arch/csky/abiv1/cacheflush.c

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4

arch/csky/abiv1/inc/abi/cacheflush.h

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