linux/arch/arm64/mm/flush.c
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   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Based on arch/arm/mm/flush.c
   4 *
   5 * Copyright (C) 1995-2002 Russell King
   6 * Copyright (C) 2012 ARM Ltd.
   7 */
   8
   9#include <linux/export.h>
  10#include <linux/mm.h>
  11#include <linux/pagemap.h>
  12
  13#include <asm/cacheflush.h>
  14#include <asm/cache.h>
  15#include <asm/tlbflush.h>
  16
  17void sync_icache_aliases(void *kaddr, unsigned long len)
  18{
  19        unsigned long addr = (unsigned long)kaddr;
  20
  21        if (icache_is_aliasing()) {
  22                __clean_dcache_area_pou(kaddr, len);
  23                __flush_icache_all();
  24        } else {
  25                /*
  26                 * Don't issue kick_all_cpus_sync() after I-cache invalidation
  27                 * for user mappings.
  28                 */
  29                __flush_icache_range(addr, addr + len);
  30        }
  31}
  32
  33static void flush_ptrace_access(struct vm_area_struct *vma, struct page *page,
  34                                unsigned long uaddr, void *kaddr,
  35                                unsigned long len)
  36{
  37        if (vma->vm_flags & VM_EXEC)
  38                sync_icache_aliases(kaddr, len);
  39}
  40
  41/*
  42 * Copy user data from/to a page which is mapped into a different processes
  43 * address space.  Really, we want to allow our "user space" model to handle
  44 * this.
  45 */
  46void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
  47                       unsigned long uaddr, void *dst, const void *src,
  48                       unsigned long len)
  49{
  50        memcpy(dst, src, len);
  51        flush_ptrace_access(vma, page, uaddr, dst, len);
  52}
  53
  54void __sync_icache_dcache(pte_t pte)
  55{
  56        struct page *page = pte_page(pte);
  57
  58        if (!test_bit(PG_dcache_clean, &page->flags)) {
  59                sync_icache_aliases(page_address(page), page_size(page));
  60                set_bit(PG_dcache_clean, &page->flags);
  61        }
  62}
  63EXPORT_SYMBOL_GPL(__sync_icache_dcache);
  64
  65/*
  66 * This function is called when a page has been modified by the kernel. Mark
  67 * it as dirty for later flushing when mapped in user space (if executable,
  68 * see __sync_icache_dcache).
  69 */
  70void flush_dcache_page(struct page *page)
  71{
  72        if (test_bit(PG_dcache_clean, &page->flags))
  73                clear_bit(PG_dcache_clean, &page->flags);
  74}
  75EXPORT_SYMBOL(flush_dcache_page);
  76
  77/*
  78 * Additional functions defined in assembly.
  79 */
  80EXPORT_SYMBOL(__flush_icache_range);
  81
  82#ifdef CONFIG_ARCH_HAS_PMEM_API
  83void arch_wb_cache_pmem(void *addr, size_t size)
  84{
  85        /* Ensure order against any prior non-cacheable writes */
  86        dmb(osh);
  87        __clean_dcache_area_pop(addr, size);
  88}
  89EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);
  90
  91void arch_invalidate_pmem(void *addr, size_t size)
  92{
  93        __inval_dcache_area(addr, size);
  94}
  95EXPORT_SYMBOL_GPL(arch_invalidate_pmem);
  96#endif
  97