arch/powerpc/lib/pmem.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright(c) 2017 IBM Corporation. All rights reserved.
   4  */
   5
   6 #include <linux/string.h>
   7 #include <linux/export.h>
   8 #include <linux/uaccess.h>
   9
  10 #include <asm/cacheflush.h>
  11
  12 /*
  13  * CONFIG_ARCH_HAS_PMEM_API symbols
  14  */
  15 void arch_wb_cache_pmem(void *addr, size_t size)
  16 {
  17         unsigned long start = (unsigned long) addr;
  18         flush_dcache_range(start, start + size);
  19 }
  20 EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);
  21
  22 void arch_invalidate_pmem(void *addr, size_t size)
  23 {
  24         unsigned long start = (unsigned long) addr;
  25         flush_dcache_range(start, start + size);
  26 }
  27 EXPORT_SYMBOL_GPL(arch_invalidate_pmem);
  28
  29 /*
  30  * CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE symbols
  31  */
  32 long __copy_from_user_flushcache(void *dest, const void __user *src,
  33                 unsigned size)
  34 {
  35         unsigned long copied, start = (unsigned long) dest;
  36
  37         copied = __copy_from_user(dest, src, size);
  38         flush_dcache_range(start, start + size);
  39
  40         return copied;
  41 }
  42
  43 void *memcpy_flushcache(void *dest, const void *src, size_t size)
  44 {
  45         unsigned long start = (unsigned long) dest;
  46
  47         memcpy(dest, src, size);
  48         flush_dcache_range(start, start + size);
  49
  50         return dest;
  51 }
  52 EXPORT_SYMBOL(memcpy_flushcache);
  53
  54 void memcpy_page_flushcache(char *to, struct page *page, size_t offset,
  55         size_t len)
  56 {
  57         memcpy_flushcache(to, page_to_virt(page) + offset, len);
  58 }
  59 EXPORT_SYMBOL(memcpy_page_flushcache);