linux-kernel - [PATCH] riscv: add ARCH_DMA

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Message-Id: <20210807145537.124744-1-xianting.tian@linux.alibaba.com>
Date:   Sat,  7 Aug 2021 22:55:37 +0800
From:   Xianting Tian <xianting.tian@...ux.alibaba.com>
To:     paul.walmsley@...ive.com, palmer@...belt.com, aou@...s.berkeley.edu
Cc:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Xianting Tian <xianting.tian@...ux.alibaba.com>
Subject: [PATCH] riscv: add ARCH_DMA_MINALIGN support

Introduce ARCH_DMA_MINALIGN to riscv arch.

Signed-off-by: Xianting Tian <xianting.tian@...ux.alibaba.com>
---
 arch/riscv/include/asm/cache.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/riscv/include/asm/cache.h b/arch/riscv/include/asm/cache.h
index 9b58b1045..2945bbe2b 100644
--- a/arch/riscv/include/asm/cache.h
+++ b/arch/riscv/include/asm/cache.h
@@ -11,6 +11,8 @@
 
 #define L1_CACHE_BYTES		(1 << L1_CACHE_SHIFT)
 
+#define ARCH_DMA_MINALIGN	L1_CACHE_BYTES
+
 /*
  * RISC-V requires the stack pointer to be 16-byte aligned, so ensure that
  * the flat loader aligns it accordingly.
-- 
2.17.1