1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Based on arch/arm/include/asm/tlb.h 4 * 5 * Copyright (C) 2002 Russell King 6 * Copyright (C) 2012 ARM Ltd. 7 */ 8 #ifndef __ASM_TLB_H 9 #define __ASM_TLB_H 10 11 #include <linux/pagemap.h> 12 #include <linux/swap.h> 13 14 static inline void __tlb_remove_table(void *_table) 15 { 16 free_page_and_swap_cache((struct page *)_table); 17 } 18 19 #define tlb_flush tlb_flush 20 static void tlb_flush(struct mmu_gather *tlb); 21 22 #include <asm-generic/tlb.h> 23 24 /* 25 * get the tlbi levels in arm64. Default value is TLBI_TTL_UNKNOWN if more than 26 * one of cleared_* is set or neither is set - this elides the level hinting to 27 * the hardware. 28 */ 29 static inline int tlb_get_level(struct mmu_gather *tlb) 30 { 31 /* The TTL field is only valid for the leaf entry. */ 32 if (tlb->freed_tables) 33 return TLBI_TTL_UNKNOWN; 34 35 if (tlb->cleared_ptes && !(tlb->cleared_pmds || 36 tlb->cleared_puds || 37 tlb->cleared_p4ds)) 38 return 3; 39 40 if (tlb->cleared_pmds && !(tlb->cleared_ptes || 41 tlb->cleared_puds || 42 tlb->cleared_p4ds)) 43 return 2; 44 45 if (tlb->cleared_puds && !(tlb->cleared_ptes || 46 tlb->cleared_pmds || 47 tlb->cleared_p4ds)) 48 return 1; 49 50 if (tlb->cleared_p4ds && !(tlb->cleared_ptes || 51 tlb->cleared_pmds || 52 tlb->cleared_puds)) 53 return 0; 54 55 return TLBI_TTL_UNKNOWN; 56 } 57 58 static inline void tlb_flush(struct mmu_gather *tlb) 59 { 60 struct vm_area_struct vma = TLB_FLUSH_VMA(tlb->mm, 0); 61 bool last_level = !tlb->freed_tables; 62 unsigned long stride = tlb_get_unmap_size(tlb); 63 int tlb_level = tlb_get_level(tlb); 64 65 /* 66 * If we're tearing down the address space then we only care about 67 * invalidating the walk-cache, since the ASID allocator won't 68 * reallocate our ASID without invalidating the entire TLB. 69 */ 70 if (tlb->fullmm) { 71 if (!last_level) 72 flush_tlb_mm(tlb->mm); 73 return; 74 } 75 76 __flush_tlb_range(&vma, tlb->start, tlb->end, stride, 77 last_level, tlb_level); 78 } 79 80 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte, 81 unsigned long addr) 82 { 83 struct ptdesc *ptdesc = page_ptdesc(pte); 84 85 pagetable_pte_dtor(ptdesc); 86 tlb_remove_ptdesc(tlb, ptdesc); 87 } 88 89 #if CONFIG_PGTABLE_LEVELS > 2 90 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp, 91 unsigned long addr) 92 { 93 struct ptdesc *ptdesc = virt_to_ptdesc(pmdp); 94 95 pagetable_pmd_dtor(ptdesc); 96 tlb_remove_ptdesc(tlb, ptdesc); 97 } 98 #endif 99 100 #if CONFIG_PGTABLE_LEVELS > 3 101 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp, 102 unsigned long addr) 103 { 104 struct ptdesc *ptdesc = virt_to_ptdesc(pudp); 105 106 if (!pgtable_l4_enabled()) 107 return; 108 109 pagetable_pud_dtor(ptdesc); 110 tlb_remove_ptdesc(tlb, ptdesc); 111 } 112 #endif 113 114 #endif 115