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/pagemap.h>
   8 #include <linux/syscalls.h>
   9 #include <linux/spinlock.h>
  10 #include <asm/page.h>
  11 #include <asm/cache.h>
  12 #include <asm/cacheflush.h>
  13 #include <asm/cachectl.h>
  14
  15 #define PG_dcache_clean         PG_arch_1
  16
  17 void flush_dcache_page(struct page *page)
  18 {
  19         struct address_space *mapping;
  20
  21         if (page == ZERO_PAGE(0))
  22                 return;
  23
  24         mapping = page_mapping_file(page);
  25
  26         if (mapping && !page_mapcount(page))
  27                 clear_bit(PG_dcache_clean, &page->flags);
  28         else {
  29                 dcache_wbinv_all();
  30                 if (mapping)
  31                         icache_inv_all();
  32                 set_bit(PG_dcache_clean, &page->flags);
  33         }
  34 }
  35 EXPORT_SYMBOL(flush_dcache_page);
  36
  37 void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr,
  38         pte_t *ptep)
  39 {
  40         unsigned long pfn = pte_pfn(*ptep);
  41         struct page *page;
  42
  43         if (!pfn_valid(pfn))
  44                 return;
  45
  46         page = pfn_to_page(pfn);
  47         if (page == ZERO_PAGE(0))
  48                 return;
  49
  50         if (!test_and_set_bit(PG_dcache_clean, &page->flags))
  51                 dcache_wbinv_all();
  52
  53         if (page_mapping_file(page)) {
  54                 if (vma->vm_flags & VM_EXEC)
  55                         icache_inv_all();
  56         }
  57 }
  58
  59 void flush_cache_range(struct vm_area_struct *vma, unsigned long start,
  60         unsigned long end)
  61 {
  62         dcache_wbinv_all();
  63
  64         if (vma->vm_flags & VM_EXEC)
  65                 icache_inv_all();
  66 }