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| author | Will Deacon <will.deacon@arm.com> | 2010-08-05 11:20:51 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2010-08-10 22:10:54 +0100 |
| commit | cdf357f1e13a08a11261edacb3083746f65c1ed9 (patch) | |
| tree | bb49c4536929906b69f6e99e2457fc2ccc7944d9 | |
| parent | 988257cfcbc468cb26b3addfcab1d0187c4e2399 (diff) | |
| download | kernel_samsung_aries-cdf357f1e13a08a11261edacb3083746f65c1ed9.zip kernel_samsung_aries-cdf357f1e13a08a11261edacb3083746f65c1ed9.tar.gz kernel_samsung_aries-cdf357f1e13a08a11261edacb3083746f65c1ed9.tar.bz2 | |
ARM: 6299/1: errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID
On versions of the Cortex-A9 prior to r2p0, performing TLB invalidations by
ASID match can result in the incorrect ASID being broadcast to other CPUs.
As a consequence of this, the targetted TLB entries are not invalidated
across the system.
This workaround changes the TLB flushing routines to invalidate entries
regardless of the ASID.
Cc: <stable@kernel.org>
Tested-by: Rob Clark <rob@ti.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
| -rw-r--r-- | arch/arm/Kconfig | 12 | ||||
| -rw-r--r-- | arch/arm/include/asm/tlbflush.h | 8 |
2 files changed, 20 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 232f0c7..e395604 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1040,6 +1040,18 @@ config PL310_ERRATA_588369 is not correctly implemented in PL310 as clean lines are not invalidated as a result of these operations. Note that this errata uses Texas Instrument's secure monitor api. + +config ARM_ERRATA_720789 + bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID" + depends on CPU_V7 && SMP + help + This option enables the workaround for the 720789 Cortex-A9 (prior to + r2p0) erratum. A faulty ASID can be sent to the other CPUs for the + broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS. + As a consequence of this erratum, some TLB entries which should be + invalidated are not, resulting in an incoherency in the system page + tables. The workaround changes the TLB flushing routines to invalidate + entries regardless of the ASID. endmenu source "arch/arm/common/Kconfig" diff --git a/arch/arm/include/asm/tlbflush.h b/arch/arm/include/asm/tlbflush.h index bd863d8..33b546a 100644 --- a/arch/arm/include/asm/tlbflush.h +++ b/arch/arm/include/asm/tlbflush.h @@ -378,7 +378,11 @@ static inline void local_flush_tlb_mm(struct mm_struct *mm) if (tlb_flag(TLB_V6_I_ASID)) asm("mcr p15, 0, %0, c8, c5, 2" : : "r" (asid) : "cc"); if (tlb_flag(TLB_V7_UIS_ASID)) +#ifdef CONFIG_ARM_ERRATA_720789 + asm("mcr p15, 0, %0, c8, c3, 0" : : "r" (zero) : "cc"); +#else asm("mcr p15, 0, %0, c8, c3, 2" : : "r" (asid) : "cc"); +#endif if (tlb_flag(TLB_BTB)) { /* flush the branch target cache */ @@ -424,7 +428,11 @@ local_flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) if (tlb_flag(TLB_V6_I_PAGE)) asm("mcr p15, 0, %0, c8, c5, 1" : : "r" (uaddr) : "cc"); if (tlb_flag(TLB_V7_UIS_PAGE)) +#ifdef CONFIG_ARM_ERRATA_720789 + asm("mcr p15, 0, %0, c8, c3, 3" : : "r" (uaddr & PAGE_MASK) : "cc"); +#else asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (uaddr) : "cc"); +#endif if (tlb_flag(TLB_BTB)) { /* flush the branch target cache */ |