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arm64: Provide dcache_clean_poc_nosync helper

dcache_clean_poc_nosync does not wait for the data cache clean to
complete. Later, we wait for completion of all scatter-gather entries
together.

Cc: Leon Romanovsky <leon@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Cc: Ada Couprie Diaz <ada.coupriediaz@arm.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tangquan Zheng <zhengtangquan@oppo.com>
Tested-by: Xueyuan Chen <xueyuan.chen21@gmail.com>
Signed-off-by: Barry Song <baohua@kernel.org>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20260228221239.59903-1-21cnbao@gmail.com

authored by

Barry Song and committed by
Marek Szyprowski 1c3a7f9e 2c92eff0

+16
+1
arch/arm64/include/asm/cacheflush.h
··· 74 74 extern void dcache_clean_inval_poc(unsigned long start, unsigned long end); 75 75 extern void dcache_inval_poc(unsigned long start, unsigned long end); 76 76 extern void dcache_clean_poc(unsigned long start, unsigned long end); 77 + extern void dcache_clean_poc_nosync(unsigned long start, unsigned long end); 77 78 extern void dcache_clean_pop(unsigned long start, unsigned long end); 78 79 extern void dcache_clean_pou(unsigned long start, unsigned long end); 79 80 extern long caches_clean_inval_user_pou(unsigned long start, unsigned long end);
+15
arch/arm64/mm/cache.S
··· 179 179 SYM_FUNC_ALIAS(dcache_clean_poc, __pi_dcache_clean_poc) 180 180 181 181 /* 182 + * dcache_clean_poc_nosync(start, end) 183 + * 184 + * Issue the instructions of D-cache lines for the interval [start, end). 185 + * not necessarily cleaned to the PoC till an explicit dsb sy afterward. 186 + * 187 + * - start - virtual start address of region 188 + * - end - virtual end address of region 189 + */ 190 + SYM_FUNC_START(__pi_dcache_clean_poc_nosync) 191 + dcache_by_line_op_nosync cvac, x0, x1, x2, x3 192 + ret 193 + SYM_FUNC_END(__pi_dcache_clean_poc_nosync) 194 + SYM_FUNC_ALIAS(dcache_clean_poc_nosync, __pi_dcache_clean_poc_nosync) 195 + 196 + /* 182 197 * dcache_clean_pop(start, end) 183 198 * 184 199 * Ensure that any D-cache lines for the interval [start, end)