1 /* 2 * Based on arch/arm/include/asm/tlbflush.h 3 * 4 * Copyright (C) 1999-2003 Russell King 5 * Copyright (C) 2012 ARM Ltd. 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program. If not, see <http://www.gnu.org/licenses/>. 18 */ 19 #ifndef __ASM_TLBFLUSH_H 20 #define __ASM_TLBFLUSH_H 21 22 #ifndef __ASSEMBLY__ 23 24 #include <linux/sched.h> 25 #include <asm/cputype.h> 26 #include <asm/mmu.h> 27 28 /* 29 * Raw TLBI operations. 30 * 31 * Where necessary, use the __tlbi() macro to avoid asm() 32 * boilerplate. Drivers and most kernel code should use the TLB 33 * management routines in preference to the macro below. 34 * 35 * The macro can be used as __tlbi(op) or __tlbi(op, arg), depending 36 * on whether a particular TLBI operation takes an argument or 37 * not. The macros handles invoking the asm with or without the 38 * register argument as appropriate. 39 */ 40 #define __TLBI_0(op, arg) asm ("tlbi " #op "\n" \ 41 ALTERNATIVE("nop\n nop", \ 42 "dsb ish\n tlbi " #op, \ 43 ARM64_WORKAROUND_REPEAT_TLBI, \ 44 CONFIG_QCOM_FALKOR_ERRATUM_1009) \ 45 : : ) 46 47 #define __TLBI_1(op, arg) asm ("tlbi " #op ", %0\n" \ 48 ALTERNATIVE("nop\n nop", \ 49 "dsb ish\n tlbi " #op ", %0", \ 50 ARM64_WORKAROUND_REPEAT_TLBI, \ 51 CONFIG_QCOM_FALKOR_ERRATUM_1009) \ 52 : : "r" (arg)) 53 54 #define __TLBI_N(op, arg, n, ...) __TLBI_##n(op, arg) 55 56 #define __tlbi(op, ...) __TLBI_N(op, ##__VA_ARGS__, 1, 0) 57 58 #define __tlbi_user(op, arg) do { \ 59 if (arm64_kernel_unmapped_at_el0()) \ 60 __tlbi(op, (arg) | USER_ASID_FLAG); \ 61 } while (0) 62 63 /* This macro creates a properly formatted VA operand for the TLBI */ 64 #define __TLBI_VADDR(addr, asid) \ 65 ({ \ 66 unsigned long __ta = (addr) >> 12; \ 67 __ta &= GENMASK_ULL(43, 0); \ 68 __ta |= (unsigned long)(asid) << 48; \ 69 __ta; \ 70 }) 71 72 /* 73 * TLB Management 74 * ============== 75 * 76 * The TLB specific code is expected to perform whatever tests it needs 77 * to determine if it should invalidate the TLB for each call. Start 78 * addresses are inclusive and end addresses are exclusive; it is safe to 79 * round these addresses down. 80 * 81 * flush_tlb_all() 82 * 83 * Invalidate the entire TLB. 84 * 85 * flush_tlb_mm(mm) 86 * 87 * Invalidate all TLB entries in a particular address space. 88 * - mm - mm_struct describing address space 89 * 90 * flush_tlb_range(mm,start,end) 91 * 92 * Invalidate a range of TLB entries in the specified address 93 * space. 94 * - mm - mm_struct describing address space 95 * - start - start address (may not be aligned) 96 * - end - end address (exclusive, may not be aligned) 97 * 98 * flush_tlb_page(vaddr,vma) 99 * 100 * Invalidate the specified page in the specified address range. 101 * - vaddr - virtual address (may not be aligned) 102 * - vma - vma_struct describing address range 103 * 104 * flush_kern_tlb_page(kaddr) 105 * 106 * Invalidate the TLB entry for the specified page. The address 107 * will be in the kernels virtual memory space. Current uses 108 * only require the D-TLB to be invalidated. 109 * - kaddr - Kernel virtual memory address 110 */ 111 static inline void local_flush_tlb_all(void) 112 { 113 dsb(nshst); 114 __tlbi(vmalle1); 115 dsb(nsh); 116 isb(); 117 } 118 119 static inline void flush_tlb_all(void) 120 { 121 dsb(ishst); 122 __tlbi(vmalle1is); 123 dsb(ish); 124 isb(); 125 } 126 127 static inline void flush_tlb_mm(struct mm_struct *mm) 128 { 129 unsigned long asid = __TLBI_VADDR(0, ASID(mm)); 130 131 dsb(ishst); 132 __tlbi(aside1is, asid); 133 __tlbi_user(aside1is, asid); 134 dsb(ish); 135 } 136 137 static inline void flush_tlb_page(struct vm_area_struct *vma, 138 unsigned long uaddr) 139 { 140 unsigned long addr = __TLBI_VADDR(uaddr, ASID(vma->vm_mm)); 141 142 dsb(ishst); 143 __tlbi(vale1is, addr); 144 __tlbi_user(vale1is, addr); 145 dsb(ish); 146 } 147 148 /* 149 * This is meant to avoid soft lock-ups on large TLB flushing ranges and not 150 * necessarily a performance improvement. 151 */ 152 #define MAX_TLB_RANGE (1024UL << PAGE_SHIFT) 153 154 static inline void __flush_tlb_range(struct vm_area_struct *vma, 155 unsigned long start, unsigned long end, 156 bool last_level) 157 { 158 unsigned long asid = ASID(vma->vm_mm); 159 unsigned long addr; 160 161 if ((end - start) > MAX_TLB_RANGE) { 162 flush_tlb_mm(vma->vm_mm); 163 return; 164 } 165 166 start = __TLBI_VADDR(start, asid); 167 end = __TLBI_VADDR(end, asid); 168 169 dsb(ishst); 170 for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12)) { 171 if (last_level) { 172 __tlbi(vale1is, addr); 173 __tlbi_user(vale1is, addr); 174 } else { 175 __tlbi(vae1is, addr); 176 __tlbi_user(vae1is, addr); 177 } 178 } 179 dsb(ish); 180 } 181 182 static inline void flush_tlb_range(struct vm_area_struct *vma, 183 unsigned long start, unsigned long end) 184 { 185 __flush_tlb_range(vma, start, end, false); 186 } 187 188 static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end) 189 { 190 unsigned long addr; 191 192 if ((end - start) > MAX_TLB_RANGE) { 193 flush_tlb_all(); 194 return; 195 } 196 197 start = __TLBI_VADDR(start, 0); 198 end = __TLBI_VADDR(end, 0); 199 200 dsb(ishst); 201 for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12)) 202 __tlbi(vaae1is, addr); 203 dsb(ish); 204 isb(); 205 } 206 207 /* 208 * Used to invalidate the TLB (walk caches) corresponding to intermediate page 209 * table levels (pgd/pud/pmd). 210 */ 211 static inline void __flush_tlb_pgtable(struct mm_struct *mm, 212 unsigned long uaddr) 213 { 214 unsigned long addr = __TLBI_VADDR(uaddr, ASID(mm)); 215 216 __tlbi(vae1is, addr); 217 __tlbi_user(vae1is, addr); 218 dsb(ish); 219 } 220 221 #endif 222 223 #endif 224