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253 lines
6.2 KiB
253 lines
6.2 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* linux/arch/arm/kernel/smp_tlb.c |
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* |
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* Copyright (C) 2002 ARM Limited, All Rights Reserved. |
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*/ |
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#include <linux/preempt.h> |
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#include <linux/smp.h> |
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#include <linux/uaccess.h> |
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#include <asm/smp_plat.h> |
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#include <asm/tlbflush.h> |
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#include <asm/mmu_context.h> |
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/**********************************************************************/ |
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/* |
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* TLB operations |
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*/ |
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struct tlb_args { |
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struct vm_area_struct *ta_vma; |
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unsigned long ta_start; |
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unsigned long ta_end; |
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}; |
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static inline void ipi_flush_tlb_all(void *ignored) |
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{ |
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local_flush_tlb_all(); |
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} |
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static inline void ipi_flush_tlb_mm(void *arg) |
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{ |
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struct mm_struct *mm = (struct mm_struct *)arg; |
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local_flush_tlb_mm(mm); |
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} |
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static inline void ipi_flush_tlb_page(void *arg) |
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{ |
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struct tlb_args *ta = (struct tlb_args *)arg; |
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unsigned int __ua_flags = uaccess_save_and_enable(); |
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local_flush_tlb_page(ta->ta_vma, ta->ta_start); |
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uaccess_restore(__ua_flags); |
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} |
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static inline void ipi_flush_tlb_kernel_page(void *arg) |
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{ |
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struct tlb_args *ta = (struct tlb_args *)arg; |
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local_flush_tlb_kernel_page(ta->ta_start); |
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} |
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static inline void ipi_flush_tlb_range(void *arg) |
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{ |
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struct tlb_args *ta = (struct tlb_args *)arg; |
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unsigned int __ua_flags = uaccess_save_and_enable(); |
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local_flush_tlb_range(ta->ta_vma, ta->ta_start, ta->ta_end); |
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uaccess_restore(__ua_flags); |
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} |
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static inline void ipi_flush_tlb_kernel_range(void *arg) |
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{ |
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struct tlb_args *ta = (struct tlb_args *)arg; |
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local_flush_tlb_kernel_range(ta->ta_start, ta->ta_end); |
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} |
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static inline void ipi_flush_bp_all(void *ignored) |
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{ |
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local_flush_bp_all(); |
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} |
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#ifdef CONFIG_ARM_ERRATA_798181 |
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bool (*erratum_a15_798181_handler)(void); |
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static bool erratum_a15_798181_partial(void) |
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{ |
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asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (0)); |
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dsb(ish); |
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return false; |
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} |
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static bool erratum_a15_798181_broadcast(void) |
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{ |
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asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (0)); |
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dsb(ish); |
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return true; |
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} |
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void erratum_a15_798181_init(void) |
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{ |
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unsigned int midr = read_cpuid_id(); |
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unsigned int revidr = read_cpuid(CPUID_REVIDR); |
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/* Brahma-B15 r0p0..r0p2 affected |
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* Cortex-A15 r0p0..r3p3 w/o ECO fix affected |
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* Fixes applied to A15 with respect to the revision and revidr are: |
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* |
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* r0p0-r2p1: No fixes applied |
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* r2p2,r2p3: |
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* REVIDR[4]: 798181 Moving a virtual page that is being accessed |
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* by an active process can lead to unexpected behavior |
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* REVIDR[9]: Not defined |
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* r2p4,r3p0,r3p1,r3p2: |
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* REVIDR[4]: 798181 Moving a virtual page that is being accessed |
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* by an active process can lead to unexpected behavior |
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* REVIDR[9]: 798181 Moving a virtual page that is being accessed |
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* by an active process can lead to unexpected behavior |
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* - This is an update to a previously released ECO. |
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* r3p3: |
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* REVIDR[4]: Reserved |
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* REVIDR[9]: 798181 Moving a virtual page that is being accessed |
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* by an active process can lead to unexpected behavior |
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* - This is an update to a previously released ECO. |
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* |
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* Handling: |
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* REVIDR[9] set -> No WA |
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* REVIDR[4] set, REVIDR[9] cleared -> Partial WA |
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* Both cleared -> Full WA |
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*/ |
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if ((midr & 0xff0ffff0) == 0x420f00f0 && midr <= 0x420f00f2) { |
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erratum_a15_798181_handler = erratum_a15_798181_broadcast; |
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} else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr < 0x412fc0f2) { |
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erratum_a15_798181_handler = erratum_a15_798181_broadcast; |
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} else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr < 0x412fc0f4) { |
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if (revidr & 0x10) |
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erratum_a15_798181_handler = |
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erratum_a15_798181_partial; |
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else |
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erratum_a15_798181_handler = |
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erratum_a15_798181_broadcast; |
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} else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr < 0x413fc0f3) { |
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if ((revidr & 0x210) == 0) |
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erratum_a15_798181_handler = |
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erratum_a15_798181_broadcast; |
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else if (revidr & 0x10) |
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erratum_a15_798181_handler = |
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erratum_a15_798181_partial; |
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} else if ((midr & 0xff0ffff0) == 0x410fc0f0 && midr < 0x414fc0f0) { |
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if ((revidr & 0x200) == 0) |
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erratum_a15_798181_handler = |
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erratum_a15_798181_partial; |
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} |
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} |
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#endif |
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static void ipi_flush_tlb_a15_erratum(void *arg) |
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{ |
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dmb(); |
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} |
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static void broadcast_tlb_a15_erratum(void) |
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{ |
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if (!erratum_a15_798181()) |
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return; |
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smp_call_function(ipi_flush_tlb_a15_erratum, NULL, 1); |
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} |
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static void broadcast_tlb_mm_a15_erratum(struct mm_struct *mm) |
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{ |
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int this_cpu; |
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cpumask_t mask = { CPU_BITS_NONE }; |
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if (!erratum_a15_798181()) |
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return; |
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this_cpu = get_cpu(); |
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a15_erratum_get_cpumask(this_cpu, mm, &mask); |
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smp_call_function_many(&mask, ipi_flush_tlb_a15_erratum, NULL, 1); |
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put_cpu(); |
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} |
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void flush_tlb_all(void) |
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{ |
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if (tlb_ops_need_broadcast()) |
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on_each_cpu(ipi_flush_tlb_all, NULL, 1); |
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else |
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__flush_tlb_all(); |
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broadcast_tlb_a15_erratum(); |
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} |
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void flush_tlb_mm(struct mm_struct *mm) |
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{ |
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if (tlb_ops_need_broadcast()) |
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on_each_cpu_mask(mm_cpumask(mm), ipi_flush_tlb_mm, mm, 1); |
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else |
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__flush_tlb_mm(mm); |
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broadcast_tlb_mm_a15_erratum(mm); |
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} |
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void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) |
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{ |
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if (tlb_ops_need_broadcast()) { |
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struct tlb_args ta; |
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ta.ta_vma = vma; |
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ta.ta_start = uaddr; |
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on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_page, |
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&ta, 1); |
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} else |
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__flush_tlb_page(vma, uaddr); |
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broadcast_tlb_mm_a15_erratum(vma->vm_mm); |
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} |
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void flush_tlb_kernel_page(unsigned long kaddr) |
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{ |
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if (tlb_ops_need_broadcast()) { |
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struct tlb_args ta; |
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ta.ta_start = kaddr; |
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on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1); |
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} else |
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__flush_tlb_kernel_page(kaddr); |
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broadcast_tlb_a15_erratum(); |
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} |
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void flush_tlb_range(struct vm_area_struct *vma, |
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unsigned long start, unsigned long end) |
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{ |
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if (tlb_ops_need_broadcast()) { |
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struct tlb_args ta; |
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ta.ta_vma = vma; |
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ta.ta_start = start; |
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ta.ta_end = end; |
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on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_range, |
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&ta, 1); |
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} else |
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local_flush_tlb_range(vma, start, end); |
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broadcast_tlb_mm_a15_erratum(vma->vm_mm); |
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} |
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void flush_tlb_kernel_range(unsigned long start, unsigned long end) |
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{ |
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if (tlb_ops_need_broadcast()) { |
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struct tlb_args ta; |
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ta.ta_start = start; |
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ta.ta_end = end; |
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on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1); |
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} else |
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local_flush_tlb_kernel_range(start, end); |
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broadcast_tlb_a15_erratum(); |
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} |
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void flush_bp_all(void) |
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{ |
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if (tlb_ops_need_broadcast()) |
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on_each_cpu(ipi_flush_bp_all, NULL, 1); |
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else |
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__flush_bp_all(); |
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}
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