arch/powerpc/lib/pmem.c

   1 /*
   2  * Copyright(c) 2017 IBM Corporation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11  * General Public License for more details.
  12  */
  13
  14 #include <linux/string.h>
  15 #include <linux/export.h>
  16 #include <linux/uaccess.h>
  17
  18 #include <asm/cacheflush.h>
  19
  20 /*
  21  * CONFIG_ARCH_HAS_PMEM_API symbols
  22  */
  23 void arch_wb_cache_pmem(void *addr, size_t size)
  24 {
  25         unsigned long start = (unsigned long) addr;
  26         flush_inval_dcache_range(start, start + size);
  27 }
  28 EXPORT_SYMBOL(arch_wb_cache_pmem);
  29
  30 void arch_invalidate_pmem(void *addr, size_t size)
  31 {
  32         unsigned long start = (unsigned long) addr;
  33         flush_inval_dcache_range(start, start + size);
  34 }
  35 EXPORT_SYMBOL(arch_invalidate_pmem);
  36
  37 /*
  38  * CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE symbols
  39  */
  40 long __copy_from_user_flushcache(void *dest, const void __user *src,
  41                 unsigned size)
  42 {
  43         unsigned long copied, start = (unsigned long) dest;
  44
  45         copied = __copy_from_user(dest, src, size);
  46         flush_inval_dcache_range(start, start + size);
  47
  48         return copied;
  49 }
  50
  51 void *memcpy_flushcache(void *dest, const void *src, size_t size)
  52 {
  53         unsigned long start = (unsigned long) dest;
  54
  55         memcpy(dest, src, size);
  56         flush_inval_dcache_range(start, start + size);
  57
  58         return dest;
  59 }
  60 EXPORT_SYMBOL(memcpy_flushcache);
  61
  62 void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
  63         size_t len)
  64 {
  65         memcpy_flushcache(to, page_to_virt(page) + offset, len);
  66 }
  67 EXPORT_SYMBOL(memcpy_page_flushcache);