From 11aa6a32eb5f38dd670342072b9e885269013d62 Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Mon, 27 Jul 2015 22:34:17 +0200 Subject: [PATCH] arm: cache: Implement cache range check for v7 Add code to aid tracking down cache alignment issues. In case DEBUG is defined in the cache.c, this code will check alignment of each attempt to flush/invalidate data cache and print a warning if the alignment is incorrect. If DEBUG is not defined, this code is optimized out. Signed-off-by: Marek Vasut Cc: Dinh Nguyen Cc: Albert Aribaud Cc: Tom Rini --- arch/arm/cpu/armv7/cache_v7.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/arch/arm/cpu/armv7/cache_v7.c b/arch/arm/cpu/armv7/cache_v7.c index a5aa4fa..94ff488 100644 --- a/arch/arm/cpu/armv7/cache_v7.c +++ b/arch/arm/cpu/armv7/cache_v7.c @@ -16,6 +16,23 @@ #define ARMV7_DCACHE_CLEAN_INVAL_RANGE 4 #ifndef CONFIG_SYS_DCACHE_OFF +static int check_cache_range(unsigned long start, unsigned long stop) +{ + int ok = 1; + + if (start & (CONFIG_SYS_CACHELINE_SIZE - 1)) + ok = 0; + + if (stop & (CONFIG_SYS_CACHELINE_SIZE - 1)) + ok = 0; + + if (!ok) + debug("CACHE: Misaligned operation at range [%08lx, %08lx]\n", + start, stop); + + return ok; +} + /* * Write the level and type you want to Cache Size Selection Register(CSSELR) * to get size details from Current Cache Size ID Register(CCSIDR) @@ -257,6 +274,8 @@ void flush_dcache_all(void) */ void invalidate_dcache_range(unsigned long start, unsigned long stop) { + check_cache_range(start, stop); + v7_dcache_maint_range(start, stop, ARMV7_DCACHE_INVAL_RANGE); v7_outer_cache_inval_range(start, stop); @@ -269,6 +288,8 @@ void invalidate_dcache_range(unsigned long start, unsigned long stop) */ void flush_dcache_range(unsigned long start, unsigned long stop) { + check_cache_range(start, stop); + v7_dcache_maint_range(start, stop, ARMV7_DCACHE_CLEAN_INVAL_RANGE); v7_outer_cache_flush_range(start, stop); -- 2.7.4