Messages in this thread Patch in this message | | | From | Guo Ren <> | Subject | [PATCH V2] riscv: Use flush_icache_mm for flush_icache_user_range | Date | Mon, 27 Jan 2020 22:50:08 +0800 |
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The patch is the fixup for the commit 08f051eda33b by Andrew.
For copy_to_user_page, the only call path is: __access_remote_vm -> copy_to_user_page -> flush_icache_user_range
Seems it's ok to use flush_icache_mm instead of flush_icache_all and it could reduce flush_icache_all called on other harts.
Add (vma->vm_flags & VM_EXEC) condition to flush icache only for executable vma area.
ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE is used in a lot of fs/block codes. We need it to make their pages dirty and defer sync i/dcache in update_mmu_cache().
Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Andrew Waterman <andrew@sifive.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Albert Ou <aou@eecs.berkeley.edu>
--- Changelog V2: - Add VM_EXEC condition. - Remove flush_icache_user_range definition. - define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1 --- arch/riscv/include/asm/cacheflush.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/riscv/include/asm/cacheflush.h b/arch/riscv/include/asm/cacheflush.h index b69aecbb36d3..ae57d6ce63a9 100644 --- a/arch/riscv/include/asm/cacheflush.h +++ b/arch/riscv/include/asm/cacheflush.h @@ -8,7 +8,7 @@ #include <linux/mm.h> -#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0 +#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 1 /* * The cache doesn't need to be flushed when TLB entries change when @@ -62,7 +62,8 @@ static inline void flush_cache_vunmap(unsigned long start, unsigned long end) #define copy_to_user_page(vma, page, vaddr, dst, src, len) \ do { \ memcpy(dst, src, len); \ - flush_icache_user_range(vma, page, vaddr, len); \ + if (vma->vm_flags & VM_EXEC) \ + flush_icache_mm(vma->vm_mm, 0); \ } while (0) #define copy_from_user_page(vma, page, vaddr, dst, src, len) \ memcpy(dst, src, len) @@ -85,7 +86,6 @@ static inline void flush_dcache_page(struct page *page) * so instead we just flush the whole thing. */ #define flush_icache_range(start, end) flush_icache_all() -#define flush_icache_user_range(vma, pg, addr, len) flush_icache_all() void dma_wbinv_range(unsigned long start, unsigned long end); void dma_wb_range(unsigned long start, unsigned long end); -- 2.17.0
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