1 /* 2 * TLB shootdown specifics for powerpc 3 * 4 * Copyright (C) 2002 Anton Blanchard, IBM Corp. 5 * Copyright (C) 2002 Paul Mackerras, IBM Corp. 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 #ifndef _ASM_POWERPC_TLB_H 13 #define _ASM_POWERPC_TLB_H 14 #ifdef __KERNEL__ 15 16 #ifndef __powerpc64__ 17 #include <asm/pgtable.h> 18 #endif 19 #include <asm/pgalloc.h> 20 #include <asm/tlbflush.h> 21 #ifndef __powerpc64__ 22 #include <asm/page.h> 23 #include <asm/mmu.h> 24 #endif 25 26 #include <linux/pagemap.h> 27 28 #define tlb_start_vma(tlb, vma) do { } while (0) 29 #define tlb_end_vma(tlb, vma) do { } while (0) 30 #define __tlb_remove_tlb_entry __tlb_remove_tlb_entry 31 #define tlb_remove_check_page_size_change tlb_remove_check_page_size_change 32 33 extern void tlb_flush(struct mmu_gather *tlb); 34 35 /* Get the generic bits... */ 36 #include <asm-generic/tlb.h> 37 38 extern void flush_hash_entry(struct mm_struct *mm, pte_t *ptep, 39 unsigned long address); 40 41 static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, 42 unsigned long address) 43 { 44 #ifdef CONFIG_PPC_STD_MMU_32 45 if (pte_val(*ptep) & _PAGE_HASHPTE) 46 flush_hash_entry(tlb->mm, ptep, address); 47 #endif 48 } 49 50 static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb, 51 unsigned int page_size) 52 { 53 if (!tlb->page_size) 54 tlb->page_size = page_size; 55 else if (tlb->page_size != page_size) { 56 tlb_flush_mmu(tlb); 57 /* 58 * update the page size after flush for the new 59 * mmu_gather. 60 */ 61 tlb->page_size = page_size; 62 } 63 } 64 65 #ifdef CONFIG_SMP 66 static inline int mm_is_core_local(struct mm_struct *mm) 67 { 68 return cpumask_subset(mm_cpumask(mm), 69 topology_sibling_cpumask(smp_processor_id())); 70 } 71 72 #ifdef CONFIG_PPC_BOOK3S_64 73 static inline int mm_is_thread_local(struct mm_struct *mm) 74 { 75 if (atomic_read(&mm->context.active_cpus) > 1) 76 return false; 77 return cpumask_test_cpu(smp_processor_id(), mm_cpumask(mm)); 78 } 79 static inline void mm_reset_thread_local(struct mm_struct *mm) 80 { 81 WARN_ON(atomic_read(&mm->context.copros) > 0); 82 /* 83 * It's possible for mm_access to take a reference on mm_users to 84 * access the remote mm from another thread, but it's not allowed 85 * to set mm_cpumask, so mm_users may be > 1 here. 86 */ 87 WARN_ON(current->mm != mm); 88 atomic_set(&mm->context.active_cpus, 1); 89 cpumask_clear(mm_cpumask(mm)); 90 cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm)); 91 } 92 #else /* CONFIG_PPC_BOOK3S_64 */ 93 static inline int mm_is_thread_local(struct mm_struct *mm) 94 { 95 return cpumask_equal(mm_cpumask(mm), 96 cpumask_of(smp_processor_id())); 97 } 98 #endif /* !CONFIG_PPC_BOOK3S_64 */ 99 100 #else /* CONFIG_SMP */ 101 static inline int mm_is_core_local(struct mm_struct *mm) 102 { 103 return 1; 104 } 105 106 static inline int mm_is_thread_local(struct mm_struct *mm) 107 { 108 return 1; 109 } 110 #endif 111 112 #endif /* __KERNEL__ */ 113 #endif /* __ASM_POWERPC_TLB_H */ 114