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smp_tlb.c


products/Sources/formale Sprachen/C/Linux/arch/arm/kernel/smp_tlb.c

// SPDX-License-Identifier: GPL-2.0-only /* * linux/arch/arm/kernel/smp_tlb.c * * Copyright (C) 2002 ARM Limited, All Rights Reserved. */ #include #include #include #include #include #include /**********************************************************************/ /* * TLB operations */ struct tlb_args { struct vm_area_struct *ta_vma; unsigned long ta_start; unsigned long ta_end; }; static inline void ipi_flush_tlb_all(void *ignored) { local_flush_tlb_all(); } static inline void ipi_flush_tlb_mm(void *arg) { struct mm_struct *mm = (struct mm_struct *)arg; local_flush_tlb_mm(mm); } 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) { struct tlb_args *ta = (struct tlb_args *)arg; local_flush_tlb_kernel_page(ta->ta_start); } 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) { struct tlb_args *ta = (struct tlb_args *)arg; local_flush_tlb_kernel_range(ta->ta_start, ta->ta_end); } static inline void ipi_flush_bp_all(void *ignored) { local_flush_bp_all(); } #ifdef CONFIG_ARM_ERRATA_798181 bool (*erratum_a15_798181_handler)(void); static bool erratum_a15_798181_partial(void) { asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (0)); dsb(ish); return false; } static bool erratum_a15_798181_broadcast(void) { asm("mcr p15, 0, %0, c8, c3, 1" : : "r" (0)); dsb(ish); return true; } void erratum_a15_798181_init(void) { 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 static void ipi_flush_tlb_a15_erratum(void *arg) { dmb(); } static void broadcast_tlb_a15_erratum(void) { if (!erratum_a15_798181()) return; smp_call_function(ipi_flush_tlb_a15_erratum, NULL, 1); } static void broadcast_tlb_mm_a15_erratum(struct mm_struct *mm) { int this_cpu; cpumask_t mask = { CPU_BITS_NONE }; if (!erratum_a15_798181()) return; this_cpu = get_cpu(); a15_erratum_get_cpumask(this_cpu, mm, &mask); smp_call_function_many(&mask, ipi_flush_tlb_a15_erratum, NULL, 1); put_cpu(); } void flush_tlb_all(void) { if (tlb_ops_need_broadcast()) on_each_cpu(ipi_flush_tlb_all, NULL, 1); else __flush_tlb_all(); broadcast_tlb_a15_erratum(); } 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 __flush_tlb_mm(mm); broadcast_tlb_mm_a15_erratum(mm); } void flush_tlb_page(struct vm_area_struct *vma, unsigned long uaddr) { if (tlb_ops_need_broadcast()) { struct tlb_args ta; ta.ta_vma = vma; ta.ta_start = uaddr; on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_page, &ta, 1); } else __flush_tlb_page(vma, uaddr); broadcast_tlb_mm_a15_erratum(vma->vm_mm); } void flush_tlb_kernel_page(unsigned long kaddr) { if (tlb_ops_need_broadcast()) { struct tlb_args ta; ta.ta_start = kaddr; on_each_cpu(ipi_flush_tlb_kernel_page, &ta, 1); } else __flush_tlb_kernel_page(kaddr); broadcast_tlb_a15_erratum(); } void flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end) { if (tlb_ops_need_broadcast()) { struct tlb_args ta; ta.ta_vma = vma; ta.ta_start = start; ta.ta_end = end; on_each_cpu_mask(mm_cpumask(vma->vm_mm), ipi_flush_tlb_range, &ta, 1); } else local_flush_tlb_range(vma, start, end); broadcast_tlb_mm_a15_erratum(vma->vm_mm); } void flush_tlb_kernel_range(unsigned long start, unsigned long end) { if (tlb_ops_need_broadcast()) { struct tlb_args ta; ta.ta_start = start; ta.ta_end = end; on_each_cpu(ipi_flush_tlb_kernel_range, &ta, 1); } else local_flush_tlb_kernel_range(start, end); broadcast_tlb_a15_erratum(); } void flush_bp_all(void) { if (tlb_ops_need_broadcast()) on_each_cpu(ipi_flush_bp_all, NULL, 1); else __flush_bp_all(); }

                                                                                                                                                                                                                                                                                                                                                                                                     

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