linux-kernel - [RFC PATCH 2/5] arm64: Provide dcache_clean_poc

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Message-Id: <20251029023115.22809-3-21cnbao@gmail.com>
Date: Wed, 29 Oct 2025 10:31:12 +0800
From: Barry Song <21cnbao@...il.com>
To: Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Robin Murphy <robin.murphy@....com>
Cc: Barry Song <v-songbaohua@...o.com>,
	Ada Couprie Diaz <ada.coupriediaz@....com>,
	Ard Biesheuvel <ardb@...nel.org>,
	Marc Zyngier <maz@...nel.org>,
	Anshuman Khandual <anshuman.khandual@....com>,
	Ryan Roberts <ryan.roberts@....com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Tangquan Zheng <zhengtangquan@...o.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	iommu@...ts.linux.dev
Subject: [RFC PATCH 2/5] arm64: Provide dcache_clean_poc_nosync helper

From: Barry Song <v-songbaohua@...o.com>

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: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Robin Murphy <robin.murphy@....com>
Cc: Ada Couprie Diaz <ada.coupriediaz@....com>
Cc: Ard Biesheuvel <ardb@...nel.org>
Cc: Marc Zyngier <maz@...nel.org>
Cc: Anshuman Khandual <anshuman.khandual@....com>
Cc: Ryan Roberts <ryan.roberts@....com>
Cc: Suren Baghdasaryan <surenb@...gle.com>
Cc: Tangquan Zheng <zhengtangquan@...o.com>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Cc: iommu@...ts.linux.dev
Signed-off-by: Barry Song <v-songbaohua@...o.com>
---
 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)
  *
-- 
2.39.3 (Apple Git-146)