From 08fe007968b2b45e831daf74899f79a54d73f773 Mon Sep 17 00:00:00 2001 From: Vineet Gupta Date: Mon, 19 Dec 2016 11:38:38 -0800 Subject: [PATCH] ARC: mm: arc700: Don't assume 2 colours for aliasing VIPT dcache An ARC700 customer reported linux boot crashes when upgrading to bigger L1 dcache (64K from 32K). Turns out they had an aliasing VIPT config and current code only assumed 2 colours, while theirs had 4. So default to 4 colours and complain if there are fewer. Ideally this needs to be a Kconfig option, but heck that's too much of hassle for a single user. Cc: stable@vger.kernel.org Signed-off-by: Vineet Gupta --- arch/arc/include/asm/cacheflush.h | 6 ++++-- arch/arc/mm/cache.c | 11 ++++++++--- 2 files changed, 12 insertions(+), 5 deletions(-) diff --git a/arch/arc/include/asm/cacheflush.h b/arch/arc/include/asm/cacheflush.h index a093adbdb017..fc662f49c55a 100644 --- a/arch/arc/include/asm/cacheflush.h +++ b/arch/arc/include/asm/cacheflush.h @@ -85,6 +85,10 @@ void flush_anon_page(struct vm_area_struct *vma, */ #define PG_dc_clean PG_arch_1 +#define CACHE_COLORS_NUM 4 +#define CACHE_COLORS_MSK (CACHE_COLORS_NUM - 1) +#define CACHE_COLOR(addr) (((unsigned long)(addr) >> (PAGE_SHIFT)) & CACHE_COLORS_MSK) + /* * Simple wrapper over config option * Bootup code ensures that hardware matches kernel configuration @@ -94,8 +98,6 @@ static inline int cache_is_vipt_aliasing(void) return IS_ENABLED(CONFIG_ARC_CACHE_VIPT_ALIASING); } -#define CACHE_COLOR(addr) (((unsigned long)(addr) >> (PAGE_SHIFT)) & 1) - /* * checks if two addresses (after page aligning) index into same cache set */ diff --git a/arch/arc/mm/cache.c b/arch/arc/mm/cache.c index a0ce8ff1e59c..ec86ac0e3321 100644 --- a/arch/arc/mm/cache.c +++ b/arch/arc/mm/cache.c @@ -972,11 +972,16 @@ void arc_cache_init(void) /* check for D-Cache aliasing on ARCompact: ARCv2 has PIPT */ if (is_isa_arcompact()) { int handled = IS_ENABLED(CONFIG_ARC_CACHE_VIPT_ALIASING); + int num_colors = dc->sz_k/dc->assoc/TO_KB(PAGE_SIZE); - if (dc->alias && !handled) - panic("Enable CONFIG_ARC_CACHE_VIPT_ALIASING\n"); - else if (!dc->alias && handled) + if (dc->alias) { + if (!handled) + panic("Enable CONFIG_ARC_CACHE_VIPT_ALIASING\n"); + if (CACHE_COLORS_NUM != num_colors) + panic("CACHE_COLORS_NUM not optimized for config\n"); + } else if (!dc->alias && handled) { panic("Disable CONFIG_ARC_CACHE_VIPT_ALIASING\n"); + } } }