@@ -41,8 +41,20 @@ struct ppc64_caches {
extern struct ppc64_caches ppc64_caches;
#endif /* __powerpc64__ && ! __ASSEMBLY__ */
-#if !defined(__ASSEMBLY__)
+#if defined(__ASSEMBLY__)
+/*
+ * For a snooping icache, we still need a dummy icbi to purge all the
+ * prefetched instructions from the ifetch buffers. We also need a sync
+ * before the icbi to order the the actual stores to memory that might
+ * have modified instructions with the icbi.
+ */
+#define PURGE_PREFETCHED_INS \
+ sync; \
+ icbi 0,r3; \
+ sync; \
+ isync
+#else
#define __read_mostly __attribute__((__section__(".data..read_mostly")))
#ifdef CONFIG_6xx
@@ -329,7 +329,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_UNIFIED_ID_CACHE)
*/
_KPROBE(flush_icache_range)
BEGIN_FTR_SECTION
- isync
+ PURGE_PREFETCHED_INS
blr /* for 601, do nothing */
END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
li r5,L1_CACHE_BYTES-1
@@ -433,6 +433,7 @@ _GLOBAL(invalidate_dcache_range)
*/
_GLOBAL(__flush_dcache_icache)
BEGIN_FTR_SECTION
+ PURGE_PREFETCHED_INS
blr
END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
rlwinm r3,r3,0,0,31-PAGE_SHIFT /* Get page base address */
@@ -474,6 +475,7 @@ END_MMU_FTR_SECTION_IFSET(MMU_FTR_TYPE_44x)
*/
_GLOBAL(__flush_dcache_icache_phys)
BEGIN_FTR_SECTION
+ PURGE_PREFETCHED_INS
blr /* for 601, do nothing */
END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
mfmsr r10
@@ -69,6 +69,7 @@ PPC64_CACHES:
_KPROBE(flush_icache_range)
BEGIN_FTR_SECTION
+ PURGE_PREFETCHED_INS
blr
END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
/*
@@ -208,7 +209,7 @@ _GLOBAL(flush_inval_dcache_range)
*/
_GLOBAL(__flush_dcache_icache)
BEGIN_FTR_SECTION
- isync
+ PURGE_PREFETCHED_INS
blr
END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
/*
As Benjamin Herrenschmidt has indicated, we still need a dummy icbi to purge all the prefetched instructions from the ifetch buffers for the snooping icache. We also need a sync before the icbi to order the actual stores to memory that might have modified instructions with the icbi. Signed-off-by: Kevin Hao <haokexin@gmail.com> --- arch/powerpc/include/asm/cache.h | 14 +++++++++++++- arch/powerpc/kernel/misc_32.S | 4 +++- arch/powerpc/kernel/misc_64.S | 3 ++- 3 files changed, 18 insertions(+), 3 deletions(-)