target/linux/brcm47xx/patches-3.8/160-kmap_coherent.patch

   1 --- a/arch/mips/include/asm/cpu-features.h
   2 +++ b/arch/mips/include/asm/cpu-features.h
   3 @@ -110,6 +110,9 @@
   4  #ifndef cpu_has_pindexed_dcache
   5  #define cpu_has_pindexed_dcache        (cpu_data[0].dcache.flags & MIPS_CACHE_PINDEX)
   6  #endif
   7 +#ifndef cpu_use_kmap_coherent
   8 +#define cpu_use_kmap_coherent 1
   9 +#endif
  10
  11  /*
  12   * I-Cache snoops remote store.  This only matters on SMP.  Some multiprocessors
  13 --- /dev/null
  14 +++ b/arch/mips/include/asm/mach-bcm47xx/cpu-feature-overrides.h
  15 @@ -0,0 +1,13 @@
  16 +/*
  17 + * This file is subject to the terms and conditions of the GNU General Public
  18 + * License.  See the file "COPYING" in the main directory of this archive
  19 + * for more details.
  20 + *
  21 + * Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
  22 + */
  23 +#ifndef __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H
  24 +#define __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H
  25 +
  26 +#define cpu_use_kmap_coherent  0
  27 +
  28 +#endif /* __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H */
  29 --- a/arch/mips/mm/c-r4k.c
  30 +++ b/arch/mips/mm/c-r4k.c
  31 @@ -506,7 +506,7 @@ static inline void local_r4k_flush_cache
  32                  */
  33                 map_coherent = (cpu_has_dc_aliases &&
  34                                 page_mapped(page) && !Page_dcache_dirty(page));
  35 -               if (map_coherent)
  36 +               if (map_coherent && cpu_use_kmap_coherent)
  37                         vaddr = kmap_coherent(page, addr);
  38                 else
  39                         vaddr = kmap_atomic(page);
  40 @@ -529,7 +529,7 @@ static inline void local_r4k_flush_cache
  41         }
  42
  43         if (vaddr) {
  44 -               if (map_coherent)
  45 +               if (map_coherent && cpu_use_kmap_coherent)
  46                         kunmap_coherent();
  47                 else
  48                         kunmap_atomic(vaddr);
  49 --- a/arch/mips/mm/init.c
  50 +++ b/arch/mips/mm/init.c
  51 @@ -208,7 +208,7 @@ void copy_user_highpage(struct page *to,
  52         void *vfrom, *vto;
  53
  54         vto = kmap_atomic(to);
  55 -       if (cpu_has_dc_aliases &&
  56 +       if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
  57             page_mapped(from) && !Page_dcache_dirty(from)) {
  58                 vfrom = kmap_coherent(from, vaddr);
  59                 copy_page(vto, vfrom);
  60 @@ -230,7 +230,7 @@ void copy_to_user_page(struct vm_area_st
  61         struct page *page, unsigned long vaddr, void *dst, const void *src,
  62         unsigned long len)
  63  {
  64 -       if (cpu_has_dc_aliases &&
  65 +       if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
  66             page_mapped(page) && !Page_dcache_dirty(page)) {
  67                 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
  68                 memcpy(vto, src, len);
  69 @@ -248,7 +248,7 @@ void copy_from_user_page(struct vm_area_
  70         struct page *page, unsigned long vaddr, void *dst, const void *src,
  71         unsigned long len)
  72  {
  73 -       if (cpu_has_dc_aliases &&
  74 +       if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
  75             page_mapped(page) && !Page_dcache_dirty(page)) {
  76                 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
  77                 memcpy(dst, vfrom, len);