LXR linux/arch/csky/abiv1/cacheflush.c

   1// SPDX-License-Identifier: GPL-2.0
   2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
   3
   4#include <linux/kernel.h>
   5#include <linux/mm.h>
   6#include <linux/fs.h>
   7#include <linux/syscalls.h>
   8#include <linux/spinlock.h>
   9#include <asm/page.h>
  10#include <asm/cache.h>
  11#include <asm/cacheflush.h>
  12#include <asm/cachectl.h>
  13
  14#define PG_dcache_clean         PG_arch_1
  15
  16void flush_dcache_page(struct page *page)
  17{
  18        struct address_space *mapping;
  19
  20        if (page == ZERO_PAGE(0))
  21                return;
  22
  23        mapping = page_mapping_file(page);
  24
  25        if (mapping && !page_mapcount(page))
  26                clear_bit(PG_dcache_clean, &page->flags);
  27        else {
  28                dcache_wbinv_all();
  29                if (mapping)
  30                        icache_inv_all();
  31                set_bit(PG_dcache_clean, &page->flags);
  32        }
  33}
  34EXPORT_SYMBOL(flush_dcache_page);
  35
  36void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
  37        pte_t *ptep)
  38{
  39        unsigned long pfn = pte_pfn(*ptep);
  40        struct page *page;
  41
  42        if (!pfn_valid(pfn))
  43                return;
  44
  45        page = pfn_to_page(pfn);
  46        if (page == ZERO_PAGE(0))
  47                return;
  48
  49        if (!test_and_set_bit(PG_dcache_clean, &page->flags))
  50                dcache_wbinv_all();
  51
  52        if (page_mapping_file(page)) {
  53                if (vma->vm_flags & VM_EXEC)
  54                        icache_inv_all();
  55        }
  56}
  57
  58void flush_kernel_dcache_page(struct page *page)
  59{
  60        struct address_space *mapping;
  61
  62        mapping = page_mapping_file(page);
  63
  64        if (!mapping || mapping_mapped(mapping))
  65                dcache_wbinv_all();
  66}
  67EXPORT_SYMBOL(flush_kernel_dcache_page);
  68
  69void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
  70        unsigned long end)
  71{
  72        dcache_wbinv_all();
  73
  74        if (vma->vm_flags & VM_EXEC)
  75                icache_inv_all();
  76}
  77