[PATCH v2 2/8] arm64: Provide dcache_clean_poc_nosync helper
From: Barry Song <hidden>
Date: 2025-12-26 22:53:33
Also in:
linux-iommu, lkml, xen-devel
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
From: Barry Song <baohua@kernel.org> 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 <redacted> Cc: Ard Biesheuvel <ardb@kernel.org> Cc: Marc Zyngier <maz@kernel.org> Cc: Anshuman Khandual <redacted> Cc: Ryan Roberts <ryan.roberts@arm.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Tangquan Zheng <redacted> Signed-off-by: Barry Song <baohua@kernel.org> --- arch/arm64/include/asm/cacheflush.h | 1 + arch/arm64/mm/cache.S | 15 +++++++++++++++ 2 files changed, 16 insertions(+)
diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h
index 28ab96e808ef..9b6d0a62cf3d 100644
--- a/arch/arm64/include/asm/cacheflush.h
+++ b/arch/arm64/include/asm/cacheflush.h@@ -74,6 +74,7 @@ extern void icache_inval_pou(unsigned long start, unsigned long end); extern void dcache_clean_inval_poc(unsigned long start, unsigned long end); extern void dcache_inval_poc(unsigned long start, unsigned long end); extern void dcache_clean_poc(unsigned long start, unsigned long end); +extern void dcache_clean_poc_nosync(unsigned long start, unsigned long end); extern void dcache_clean_pop(unsigned long start, unsigned long end); extern void dcache_clean_pou(unsigned long start, unsigned long end); extern long caches_clean_inval_user_pou(unsigned long start, unsigned long end);
diff --git a/arch/arm64/mm/cache.S b/arch/arm64/mm/cache.S
index 503567c864fd..4a7c7e03785d 100644
--- a/arch/arm64/mm/cache.S
+++ b/arch/arm64/mm/cache.S@@ -178,6 +178,21 @@ SYM_FUNC_START(__pi_dcache_clean_poc) SYM_FUNC_END(__pi_dcache_clean_poc) SYM_FUNC_ALIAS(dcache_clean_poc, __pi_dcache_clean_poc) +/* + * dcache_clean_poc_nosync(start, end) + * + * Issue the instructions of D-cache lines for the interval [start, end). + * not necessarily cleaned to the PoC till an explicit dsb sy afterward. + * + * - start - virtual start address of region + * - end - virtual end address of region + */ +SYM_FUNC_START(__pi_dcache_clean_poc_nosync) + dcache_by_line_op_nosync cvac, x0, x1, x2, x3 + ret +SYM_FUNC_END(__pi_dcache_clean_poc_nosync) +SYM_FUNC_ALIAS(dcache_clean_poc_nosync, __pi_dcache_clean_poc_nosync) + /* * dcache_clean_pop(start, end) *
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2.43.0