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ARM: Fix errata 411920 workarounds 

Errata 411920 indicates that any "invalidate entire instruction cache"
operation can fail if the right conditions are present.  This is not
limited just to those operations in flush.c, but elsewhere.  Place the
workaround in the already existing __flush_icache_all() function
instead.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2009-10-24 22:36:36 +01:00
parent 657e12fd38
commit df71dfd4ca
3 changed files with 12 additions and 29 deletions
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5
arch/arm/include/asm/cacheflush.h
View File

@ -414,9 +414,14 @@ extern void __flush_dcache_page(struct address_space *mapping, struct page *page
static inline void __flush_icache_all(void)
{
#ifdef CONFIG_ARM_ERRATA_411920
extern void v6_icache_inval_all(void);
v6_icache_inval_all();
#else
asm("mcr p15, 0, %0, c7, c5, 0 @ invalidate I-cache\n"
:
: "r" (0));
#endif
}
#define ARCH_HAS_FLUSH_ANON_PAGE

5
arch/arm/mm/context.c
View File

@ -50,10 +50,7 @@ void __new_context(struct mm_struct *mm)
isb();
flush_tlb_all();
if (icache_is_vivt_asid_tagged()) {
asm("mcr p15, 0, %0, c7, c5, 0 @ invalidate I-cache\n"
"mcr p15, 0, %0, c7, c5, 6 @ flush BTAC/BTB\n"
:
: "r" (0));
__flush_icache_all();
dsb();
}
}

31
arch/arm/mm/flush.c
View File

@ -18,10 +18,6 @@
#include "mm.h"
#ifdef CONFIG_ARM_ERRATA_411920
extern void v6_icache_inval_all(void);
#endif
#ifdef CONFIG_CPU_CACHE_VIPT
#define ALIAS_FLUSH_START 0xffff4000
@ -35,16 +31,11 @@ static void flush_pfn_alias(unsigned long pfn, unsigned long vaddr)
flush_tlb_kernel_page(to);
asm( "mcrr p15, 0, %1, %0, c14\n"
" mcr p15, 0, %2, c7, c10, 4\n"
#ifndef CONFIG_ARM_ERRATA_411920
" mcr p15, 0, %2, c7, c5, 0\n"
#endif
" mcr p15, 0, %2, c7, c10, 4"
:
: "r" (to), "r" (to + PAGE_SIZE - L1_CACHE_BYTES), "r" (zero)
: "cc");
#ifdef CONFIG_ARM_ERRATA_411920
v6_icache_inval_all();
#endif
__flush_icache_all();
}
void flush_cache_mm(struct mm_struct *mm)
@ -57,16 +48,11 @@ void flush_cache_mm(struct mm_struct *mm)
if (cache_is_vipt_aliasing()) {
asm( "mcr p15, 0, %0, c7, c14, 0\n"
" mcr p15, 0, %0, c7, c10, 4\n"
#ifndef CONFIG_ARM_ERRATA_411920
" mcr p15, 0, %0, c7, c5, 0\n"
#endif
" mcr p15, 0, %0, c7, c10, 4"
:
: "r" (0)
: "cc");
#ifdef CONFIG_ARM_ERRATA_411920
v6_icache_inval_all();
#endif
__flush_icache_all();
}
}
@ -81,16 +67,11 @@ void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned
if (cache_is_vipt_aliasing()) {
asm( "mcr p15, 0, %0, c7, c14, 0\n"
" mcr p15, 0, %0, c7, c10, 4\n"
#ifndef CONFIG_ARM_ERRATA_411920
" mcr p15, 0, %0, c7, c5, 0\n"
#endif
" mcr p15, 0, %0, c7, c10, 4"
:
: "r" (0)
: "cc");
#ifdef CONFIG_ARM_ERRATA_411920
v6_icache_inval_all();
#endif
__flush_icache_all();
}
}