From: Barry Song <baohua@kernel.org>
Date: Sat, 28 Feb 2026 22:12:39 +0000 (+0800)
Subject: arm64: Provide dcache_clean_poc_nosync helper
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1c3a7f9e6bac8993946d384ee4c2f79910e93cd8;p=thirdparty%2Flinux.git

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
---

diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h
index 28ab96e808eff..9b6d0a62cf3d0 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 503567c864fde..4a7c7e03785d1 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)
  *