1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_POWERPC_BOOK3S_64_TLBFLUSH_H 3 #define _ASM_POWERPC_BOOK3S_64_TLBFLUSH_H 4 5 #define MMU_NO_CONTEXT ~0UL 6 7 #include <linux/mm_types.h> 8 #include <linux/mmu_notifier.h> 9 #include <asm/book3s/64/tlbflush-hash.h> 10 #include <asm/book3s/64/tlbflush-radix.h> 11 12 /* TLB flush actions. Used as argument to tlbiel_all() */ 13 enum { 14 TLB_INVAL_SCOPE_GLOBAL = 0, /* invalidate all TLBs */ 15 TLB_INVAL_SCOPE_LPID = 1, /* invalidate TLBs for current LPID */ 16 }; 17 18 static inline void tlbiel_all(void) 19 { 20 /* 21 * This is used for host machine check and bootup. 22 * 23 * This uses early_radix_enabled and implementations use 24 * early_cpu_has_feature etc because that works early in boot 25 * and this is the machine check path which is not performance 26 * critical. 27 */ 28 if (early_radix_enabled()) 29 radix__tlbiel_all(TLB_INVAL_SCOPE_GLOBAL); 30 else 31 hash__tlbiel_all(TLB_INVAL_SCOPE_GLOBAL); 32 } 33 34 static inline void tlbiel_all_lpid(bool radix) 35 { 36 /* 37 * This is used for guest machine check. 38 */ 39 if (radix) 40 radix__tlbiel_all(TLB_INVAL_SCOPE_LPID); 41 else 42 hash__tlbiel_all(TLB_INVAL_SCOPE_LPID); 43 } 44 45 46 #define __HAVE_ARCH_FLUSH_PMD_TLB_RANGE 47 static inline void flush_pmd_tlb_range(struct vm_area_struct *vma, 48 unsigned long start, unsigned long end) 49 { 50 if (radix_enabled()) 51 radix__flush_pmd_tlb_range(vma, start, end); 52 } 53 54 #define __HAVE_ARCH_FLUSH_PUD_TLB_RANGE 55 static inline void flush_pud_tlb_range(struct vm_area_struct *vma, 56 unsigned long start, unsigned long end) 57 { 58 if (radix_enabled()) 59 radix__flush_pud_tlb_range(vma, start, end); 60 } 61 62 #define __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE 63 static inline void flush_hugetlb_tlb_range(struct vm_area_struct *vma, 64 unsigned long start, 65 unsigned long end) 66 { 67 if (radix_enabled()) 68 radix__flush_hugetlb_tlb_range(vma, start, end); 69 } 70 71 static inline void flush_tlb_range(struct vm_area_struct *vma, 72 unsigned long start, unsigned long end) 73 { 74 if (radix_enabled()) 75 radix__flush_tlb_range(vma, start, end); 76 } 77 78 static inline void flush_tlb_kernel_range(unsigned long start, 79 unsigned long end) 80 { 81 if (radix_enabled()) 82 radix__flush_tlb_kernel_range(start, end); 83 } 84 85 static inline void local_flush_tlb_mm(struct mm_struct *mm) 86 { 87 if (radix_enabled()) 88 radix__local_flush_tlb_mm(mm); 89 } 90 91 static inline void local_flush_tlb_page(struct vm_area_struct *vma, 92 unsigned long vmaddr) 93 { 94 if (radix_enabled()) 95 radix__local_flush_tlb_page(vma, vmaddr); 96 } 97 98 static inline void local_flush_tlb_page_psize(struct mm_struct *mm, 99 unsigned long vmaddr, int psize) 100 { 101 if (radix_enabled()) 102 radix__local_flush_tlb_page_psize(mm, vmaddr, psize); 103 } 104 105 static inline void tlb_flush(struct mmu_gather *tlb) 106 { 107 if (radix_enabled()) 108 radix__tlb_flush(tlb); 109 else 110 hash__tlb_flush(tlb); 111 } 112 113 #ifdef CONFIG_SMP 114 static inline void flush_tlb_mm(struct mm_struct *mm) 115 { 116 if (radix_enabled()) 117 radix__flush_tlb_mm(mm); 118 } 119 120 static inline void flush_tlb_page(struct vm_area_struct *vma, 121 unsigned long vmaddr) 122 { 123 if (radix_enabled()) 124 radix__flush_tlb_page(vma, vmaddr); 125 } 126 #else 127 #define flush_tlb_mm(mm) local_flush_tlb_mm(mm) 128 #define flush_tlb_page(vma, addr) local_flush_tlb_page(vma, addr) 129 #endif /* CONFIG_SMP */ 130 131 #define flush_tlb_fix_spurious_fault flush_tlb_fix_spurious_fault 132 static inline void flush_tlb_fix_spurious_fault(struct vm_area_struct *vma, 133 unsigned long address, 134 pte_t *ptep) 135 { 136 /* 137 * Book3S 64 does not require spurious fault flushes because the PTE 138 * must be re-fetched in case of an access permission problem. So the 139 * only reason for a spurious fault should be concurrent modification 140 * to the PTE, in which case the PTE will eventually be re-fetched by 141 * the MMU when it attempts the access again. 142 * 143 * See: Power ISA Version 3.1B, 6.10.1.2 Modifying a Translation Table 144 * Entry, Setting a Reference or Change Bit or Upgrading Access 145 * Authority (PTE Subject to Atomic Hardware Updates): 146 * 147 * "If the only change being made to a valid PTE that is subject to 148 * atomic hardware updates is to set the Reference or Change bit to 149 * 1 or to upgrade access authority, a simpler sequence suffices 150 * because the translation hardware will refetch the PTE if an 151 * access is attempted for which the only problems were reference 152 * and/or change bits needing to be set or insufficient access 153 * authority." 154 * 155 * The nest MMU in POWER9 does not perform this PTE re-fetch, but 156 * it avoids the spurious fault problem by flushing the TLB before 157 * upgrading PTE permissions, see radix__ptep_set_access_flags. 158 */ 159 } 160 161 static inline bool __pte_flags_need_flush(unsigned long oldval, 162 unsigned long newval) 163 { 164 unsigned long delta = oldval ^ newval; 165 166 /* 167 * The return value of this function doesn't matter for hash, 168 * ptep_modify_prot_start() does a pte_update() which does or schedules 169 * any necessary hash table update and flush. 170 */ 171 if (!radix_enabled()) 172 return true; 173 174 /* 175 * We do not expect kernel mappings or non-PTEs or not-present PTEs. 176 */ 177 VM_WARN_ON_ONCE(oldval & _PAGE_PRIVILEGED); 178 VM_WARN_ON_ONCE(newval & _PAGE_PRIVILEGED); 179 VM_WARN_ON_ONCE(!(oldval & _PAGE_PTE)); 180 VM_WARN_ON_ONCE(!(newval & _PAGE_PTE)); 181 VM_WARN_ON_ONCE(!(oldval & _PAGE_PRESENT)); 182 VM_WARN_ON_ONCE(!(newval & _PAGE_PRESENT)); 183 184 /* 185 * Must flush on any change except READ, WRITE, EXEC, DIRTY, ACCESSED. 186 * 187 * In theory, some changed software bits could be tolerated, in 188 * practice those should rarely if ever matter. 189 */ 190 191 if (delta & ~(_PAGE_RWX | _PAGE_DIRTY | _PAGE_ACCESSED)) 192 return true; 193 194 /* 195 * If any of the above was present in old but cleared in new, flush. 196 * With the exception of _PAGE_ACCESSED, don't worry about flushing 197 * if that was cleared (see the comment in ptep_clear_flush_young()). 198 */ 199 if ((delta & ~_PAGE_ACCESSED) & oldval) 200 return true; 201 202 return false; 203 } 204 205 static inline bool pte_needs_flush(pte_t oldpte, pte_t newpte) 206 { 207 return __pte_flags_need_flush(pte_val(oldpte), pte_val(newpte)); 208 } 209 #define pte_needs_flush pte_needs_flush 210 211 static inline bool huge_pmd_needs_flush(pmd_t oldpmd, pmd_t newpmd) 212 { 213 return __pte_flags_need_flush(pmd_val(oldpmd), pmd_val(newpmd)); 214 } 215 #define huge_pmd_needs_flush huge_pmd_needs_flush 216 217 extern bool tlbie_capable; 218 extern bool tlbie_enabled; 219 220 static inline bool cputlb_use_tlbie(void) 221 { 222 return tlbie_enabled; 223 } 224 225 #endif /* _ASM_POWERPC_BOOK3S_64_TLBFLUSH_H */ 226