arch/arm64/include/asm/tlbflush.h

   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
  27 /*
  28  *      TLB Management
  29  *      ==============
  30  *
  31  *      The TLB specific code is expected to perform whatever tests it needs
  32  *      to determine if it should invalidate the TLB for each call.  Start
  33  *      addresses are inclusive and end addresses are exclusive; it is safe to
  34  *      round these addresses down.
  35  *
  36  *      flush_tlb_all()
  37  *
  38  *              Invalidate the entire TLB.
  39  *
  40  *      flush_tlb_mm(mm)
  41  *
  42  *              Invalidate all TLB entries in a particular address space.
  43  *              - mm    - mm_struct describing address space
  44  *
  45  *      flush_tlb_range(mm,start,end)
  46  *
  47  *              Invalidate a range of TLB entries in the specified address
  48  *              space.
  49  *              - mm    - mm_struct describing address space
  50  *              - start - start address (may not be aligned)
  51  *              - end   - end address (exclusive, may not be aligned)
  52  *
  53  *      flush_tlb_page(vaddr,vma)
  54  *
  55  *              Invalidate the specified page in the specified address range.
  56  *              - vaddr - virtual address (may not be aligned)
  57  *              - vma   - vma_struct describing address range
  58  *
  59  *      flush_kern_tlb_page(kaddr)
  60  *
  61  *              Invalidate the TLB entry for the specified page.  The address
  62  *              will be in the kernels virtual memory space.  Current uses
  63  *              only require the D-TLB to be invalidated.
  64  *              - kaddr - Kernel virtual memory address
  65  */
  66 static inline void flush_tlb_all(void)
  67 {
  68         dsb(ishst);
  69         asm("tlbi       vmalle1is");
  70         dsb(ish);
  71         isb();
  72 }
  73
  74 static inline void flush_tlb_mm(struct mm_struct *mm)
  75 {
  76         unsigned long asid = (unsigned long)ASID(mm) << 48;
  77
  78         dsb(ishst);
  79         asm("tlbi       aside1is, %0" : : "r" (asid));
  80         dsb(ish);
  81 }
  82
  83 static inline void flush_tlb_page(struct vm_area_struct *vma,
  84                                   unsigned long uaddr)
  85 {
  86         unsigned long addr = uaddr >> 12 |
  87                 ((unsigned long)ASID(vma->vm_mm) << 48);
  88
  89         dsb(ishst);
  90         asm("tlbi       vae1is, %0" : : "r" (addr));
  91         dsb(ish);
  92 }
  93
  94 static inline void __flush_tlb_range(struct vm_area_struct *vma,
  95                                      unsigned long start, unsigned long end)
  96 {
  97         unsigned long asid = (unsigned long)ASID(vma->vm_mm) << 48;
  98         unsigned long addr;
  99         start = asid | (start >> 12);
 100         end = asid | (end >> 12);
 101
 102         dsb(ishst);
 103         for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12))
 104                 asm("tlbi vae1is, %0" : : "r"(addr));
 105         dsb(ish);
 106 }
 107
 108 static inline void __flush_tlb_kernel_range(unsigned long start, unsigned long end)
 109 {
 110         unsigned long addr;
 111         start >>= 12;
 112         end >>= 12;
 113
 114         dsb(ishst);
 115         for (addr = start; addr < end; addr += 1 << (PAGE_SHIFT - 12))
 116                 asm("tlbi vaae1is, %0" : : "r"(addr));
 117         dsb(ish);
 118         isb();
 119 }
 120
 121 /*
 122  * This is meant to avoid soft lock-ups on large TLB flushing ranges and not
 123  * necessarily a performance improvement.
 124  */
 125 #define MAX_TLB_RANGE   (1024UL << PAGE_SHIFT)
 126
 127 static inline void flush_tlb_range(struct vm_area_struct *vma,
 128                                    unsigned long start, unsigned long end)
 129 {
 130         if ((end - start) <= MAX_TLB_RANGE)
 131                 __flush_tlb_range(vma, start, end);
 132         else
 133                 flush_tlb_mm(vma->vm_mm);
 134 }
 135
 136 static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)
 137 {
 138         if ((end - start) <= MAX_TLB_RANGE)
 139                 __flush_tlb_kernel_range(start, end);
 140         else
 141                 flush_tlb_all();
 142 }
 143
 144 /*
 145  * Used to invalidate the TLB (walk caches) corresponding to intermediate page
 146  * table levels (pgd/pud/pmd).
 147  */
 148 static inline void __flush_tlb_pgtable(struct mm_struct *mm,
 149                                        unsigned long uaddr)
 150 {
 151         unsigned long addr = uaddr >> 12 | ((unsigned long)ASID(mm) << 48);
 152
 153         dsb(ishst);
 154         asm("tlbi       vae1is, %0" : : "r" (addr));
 155         dsb(ish);
 156 }
 157 /*
 158  * On AArch64, the cache coherency is handled via the set_pte_at() function.
 159  */
 160 static inline void update_mmu_cache(struct vm_area_struct *vma,
 161                                     unsigned long addr, pte_t *ptep)
 162 {
 163         /*
 164          * set_pte() does not have a DSB for user mappings, so make sure that
 165          * the page table write is visible.
 166          */
 167         dsb(ishst);
 168 }
 169
 170 #define update_mmu_cache_pmd(vma, address, pmd) do { } while (0)
 171
 172 #endif
 173
 174 #endif