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powerpc: purge all the prefetched instructions for the coherent icache flush 

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>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
hifive-unleashed-5.1
Kevin Hao 2013-08-22 09:30:35 +08:00 committed by Benjamin Herrenschmidt
parent dfee0efe3e
commit 0ce636700c
3 changed files with 22 additions and 2 deletions
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14
arch/powerpc/include/asm/cache.h
View File

@ -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

4
arch/powerpc/kernel/misc_32.S
View File

@ -344,7 +344,7 @@ 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
@ -448,6 +448,7 @@ _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 */
@ -489,6 +490,7 @@ 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

6
arch/powerpc/kernel/misc_64.S
View File

@ -67,6 +67,7 @@ PPC64_CACHES:
_KPROBE(flush_icache_range)
BEGIN_FTR_SECTION
PURGE_PREFETCHED_INS
blr
END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
/*
@ -211,6 +212,11 @@ _GLOBAL(__flush_dcache_icache)
* Different systems have different cache line sizes
*/
BEGIN_FTR_SECTION
PURGE_PREFETCHED_INS
blr
END_FTR_SECTION_IFSET(CPU_FTR_COHERENT_ICACHE)
/* Flush the dcache */
ld r7,PPC64_CACHES@toc(r2)
clrrdi r3,r3,PAGE_SHIFT /* Page align */