ARC: mm: arc700: Don't assume 2 colours for aliasing VIPT dcache

commit 08fe007968b2b45e831daf74899f79a54d73f773 upstream.

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.

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 13 insertions, 6 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 50d71695cd4e..8147583c4434 100644
--- a/arch/arc/mm/cache.c
+++ b/arch/arc/mm/cache.c
@@ -979,11 +979,16 @@ 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);
-
-                        if (dc->alias && !handled)
-                                panic("Enable CONFIG_ARC_CACHE_VIPT_ALIASING\n");
-                        else if (!dc->alias && handled)
+                        int num_colors = dc->sz_k/dc->assoc/TO_KB(PAGE_SIZE);
+
+                        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");
+                        }
                 }
         }