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 void flush_dcache_page(struct page *page)
  15 {
  16         struct address_space *mapping = page_mapping(page);
  17         unsigned long addr;
  18
  19         if (mapping && !mapping_mapped(mapping)) {
  20                 set_bit(PG_arch_1, &(page)->flags);
  21                 return;
  22         }
  23
  24         /*
  25          * We could delay the flush for the !page_mapping case too.  But that
  26          * case is for exec env/arg pages and those are %99 certainly going to
  27          * get faulted into the tlb (and thus flushed) anyways.
  28          */
  29         addr = (unsigned long) page_address(page);
  30         dcache_wb_range(addr, addr + PAGE_SIZE);
  31 }
  32
  33 void update_mmu_cache(struct vm_area_struct *vma, unsigned long address,
  34                       pte_t *pte)
  35 {
  36         unsigned long addr;
  37         struct page *page;
  38         unsigned long pfn;
  39
  40         pfn = pte_pfn(*pte);
  41         if (unlikely(!pfn_valid(pfn)))
  42                 return;
  43
  44         page = pfn_to_page(pfn);
  45         addr = (unsigned long) page_address(page);
  46
  47         if (vma->vm_flags & VM_EXEC ||
  48             pages_do_alias(addr, address & PAGE_MASK))
  49                 cache_wbinv_all();
  50
  51         clear_bit(PG_arch_1, &(page)->flags);
  52 }