linux-kernel - [PATCH 1/3] ARC: cache: declare cache-related defines via ARC_MAX_CACHE

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Date:   Tue, 16 Apr 2019 20:10:19 +0300
From:   Eugeniy Paltsev <eugeniy.paltsev@...opsys.com>
To:     linux-snps-arc@...ts.infradead.org,
        Vineet Gupta <vineet.gupta1@...opsys.com>
Cc:     linux-kernel@...r.kernel.org,
        Alexey Brodkin <alexey.brodkin@...opsys.com>,
        Eugeniy Paltsev <eugeniy.paltsev@...opsys.com>
Subject: [PATCH 1/3] ARC: cache: declare cache-related defines via ARC_MAX_CACHE_SHIFT

 * Declare all cache-related defines where we need maximum cache
line size (like SMP_CACHE_BYTES, ARCH_DMA_MINALIGN, etc...) via
one common ARC_MAX_CACHE_SHIFT define.

 * Move all cache-related defines outside '#ifdef __ASSEMBLY__'
guard to make them visible from ASM code.

This is prerequisite for autodetecting cache line size in runtime.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
---
 arch/arc/include/asm/cache.h | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/arch/arc/include/asm/cache.h b/arch/arc/include/asm/cache.h
index 2ad77fb43639..f1642634aab0 100644
--- a/arch/arc/include/asm/cache.h
+++ b/arch/arc/include/asm/cache.h
@@ -9,6 +9,12 @@
 #ifndef __ARC_ASM_CACHE_H
 #define __ARC_ASM_CACHE_H
 
+/* Largest line length for either L1 or L2 is 128 bytes (2^7) */
+#define ARC_MAX_CACHE_SHIFT	7
+#define ARC_MAX_CACHE_BYTES	(1 << (ARC_MAX_CACHE_SHIFT))
+#define SMP_CACHE_BYTES		ARC_MAX_CACHE_BYTES
+#define ARCH_DMA_MINALIGN	ARC_MAX_CACHE_BYTES
+
 /* In case $$ not config, setup a dummy number for rest of kernel */
 #ifndef CONFIG_ARC_CACHE_LINE_SHIFT
 #define L1_CACHE_SHIFT		6
@@ -47,10 +53,7 @@
 	: "r"(data), "r"(ptr));		\
 })
 
-/* Largest line length for either L1 or L2 is 128 bytes */
-#define SMP_CACHE_BYTES		128
-#define cache_line_size()	SMP_CACHE_BYTES
-#define ARCH_DMA_MINALIGN	SMP_CACHE_BYTES
+#define cache_line_size()	ARC_MAX_CACHE_BYTES
 
 /*
  * Make sure slab-allocated buffers are 64-bit aligned when atomic64_t uses
-- 
2.14.5