diff options
| -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 232f0c758252..e3956042892c 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 bd863d8608cd..33b546ae72d4 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 */ |
