diff options
Diffstat (limited to 'arch/arm/kernel/smp_tlb.c')
| -rw-r--r-- | arch/arm/kernel/smp_tlb.c | 99 |
1 files changed, 79 insertions, 20 deletions
diff --git a/arch/arm/kernel/smp_tlb.c b/arch/arm/kernel/smp_tlb.c index a98b62dca2fa..d4908b3736d8 100644 --- a/arch/arm/kernel/smp_tlb.c +++ b/arch/arm/kernel/smp_tlb.c @@ -1,14 +1,12 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * linux/arch/arm/kernel/smp_tlb.c * * Copyright (C) 2002 ARM Limited, All Rights Reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. */ #include <linux/preempt.h> #include <linux/smp.h> +#include <linux/uaccess.h> #include <asm/smp_plat.h> #include <asm/tlbflush.h> @@ -40,8 +38,11 @@ static inline void ipi_flush_tlb_mm(void *arg) static inline void ipi_flush_tlb_page(void *arg) { struct tlb_args *ta = (struct tlb_args *)arg; + unsigned int __ua_flags = uaccess_save_and_enable(); local_flush_tlb_page(ta->ta_vma, ta->ta_start); + + uaccess_restore(__ua_flags); } static inline void ipi_flush_tlb_kernel_page(void *arg) @@ -54,8 +55,11 @@ static inline void ipi_flush_tlb_kernel_page(void *arg) static inline void ipi_flush_tlb_range(void *arg) { struct tlb_args *ta = (struct tlb_args *)arg; + unsigned int __ua_flags = uaccess_save_and_enable(); local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end); + + uaccess_restore(__ua_flags); } static inline void ipi_flush_tlb_kernel_range(void *arg) @@ -71,19 +75,76 @@ static inline void ipi_flush_bp_all(void *ignored) } #ifdef CONFIG_ARM_ERRATA_798181 -static int erratum_a15_798181(void) +bool (*erratum_a15_798181_handler)(void); + +static bool erratum_a15_798181_partial(void) { - unsigned int midr = read_cpuid_id(); + asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (0)); + dsb(ish); + return false; +} - /* Cortex-A15 r0p0..r3p2 affected */ - if ((midr & 0xff0ffff0) != 0x410fc0f0 || midr > 0x413fc0f2) - return 0; - return 1; +static bool erratum_a15_798181_broadcast(void) +{ + asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (0)); + dsb(ish); + return true; } -#else -static int erratum_a15_798181(void) + +void erratum_a15_798181_init(void) { - return 0; + unsigned int midr = read_cpuid_id(); + unsigned int revidr = read_cpuid(CPUID_REVIDR); + + /* Brahma-B15 r0p0..r0p2 affected + * Cortex-A15 r0p0..r3p3 w/o ECO fix affected + * Fixes applied to A15 with respect to the revision and revidr are: + * + * r0p0-r2p1: No fixes applied + * r2p2,r2p3: + * REVIDR[4]: 798181 Moving a virtual page that is being accessed + * by an active process can lead to unexpected behavior + * REVIDR[9]: Not defined + * r2p4,r3p0,r3p1,r3p2: + * REVIDR[4]: 798181 Moving a virtual page that is being accessed + * by an active process can lead to unexpected behavior + * REVIDR[9]: 798181 Moving a virtual page that is being accessed + * by an active process can lead to unexpected behavior + * - This is an update to a previously released ECO. + * r3p3: + * REVIDR[4]: Reserved + * REVIDR[9]: 798181 Moving a virtual page that is being accessed + * by an active process can lead to unexpected behavior + * - This is an update to a previously released ECO. + * + * Handling: + * REVIDR[9] set -> No WA + * REVIDR[4] set, REVIDR[9] cleared -> Partial WA + * Both cleared -> Full WA + */ + if ((midr & 0xff0ffff0) == 0x420f00f0 && midr <= 0x420f00f2) { + erratum_a15_798181_handler = erratum_a15_798181_broadcast; + } else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr < 0x412fc0f2) { + erratum_a15_798181_handler = erratum_a15_798181_broadcast; + } else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr < 0x412fc0f4) { + if (revidr & 0x10) + erratum_a15_798181_handler = + erratum_a15_798181_partial; + else + erratum_a15_798181_handler = + erratum_a15_798181_broadcast; + } else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr < 0x413fc0f3) { + if ((revidr & 0x210) == 0) + erratum_a15_798181_handler = + erratum_a15_798181_broadcast; + else if (revidr & 0x10) + erratum_a15_798181_handler = + erratum_a15_798181_partial; + } else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr < 0x414fc0f0) { + if ((revidr & 0x200) == 0) + erratum_a15_798181_handler = + erratum_a15_798181_partial; + } } #endif @@ -97,7 +158,6 @@ static void broadcast_tlb_a15_erratum(void) if (!erratum_a15_798181()) return; - dummy_flush_tlb_a15_erratum(); smp_call_function(ipi_flush_tlb_a15_erratum, NULL, 1); } @@ -109,7 +169,6 @@ static void broadcast_tlb_mm_a15_erratum(struct mm_struct *mm) if (!erratum_a15_798181()) return; - dummy_flush_tlb_a15_erratum(); this_cpu = get_cpu(); a15_erratum_get_cpumask(this_cpu, mm, &mask); smp_call_function_many(&mask, ipi_flush_tlb_a15_erratum, NULL, 1); @@ -121,7 +180,7 @@ void flush_tlb_all(void) if (tlb_ops_need_broadcast()) on_each_cpu(ipi_flush_tlb_all, NULL, 1); else - local_flush_tlb_all(); + __flush_tlb_all(); broadcast_tlb_a15_erratum(); } @@ -130,7 +189,7 @@ void flush_tlb_mm(struct mm_struct *mm) if (tlb_ops_need_broadcast()) on_each_cpu_mask(mm_cpumask(mm), ipi_flush_tlb_mm, mm, 1); else - local_flush_tlb_mm(mm); + __flush_tlb_mm(mm); broadcast_tlb_mm_a15_erratum(mm); } @@ -143,7 +202,7 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_page, &ta, 1); } else - local_flush_tlb_page(vma, uaddr); + __flush_tlb_page(vma, uaddr); broadcast_tlb_mm_a15_erratum(vma->vm_mm); } @@ -154,7 +213,7 @@ void flush_tlb_kernel_page(unsigned long kaddr) ta.ta_start = kaddr; on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1); } else - local_flush_tlb_kernel_page(kaddr); + __flush_tlb_kernel_page(kaddr); broadcast_tlb_a15_erratum(); } @@ -190,5 +249,5 @@ void flush_bp_all(void) if (tlb_ops_need_broadcast()) on_each_cpu(ipi_flush_bp_all, NULL, 1); else - local_flush_bp_all(); + __flush_bp_all(); } |