target/linux/brcm47xx/patches-2.6.25/160-kmap_coherent.patch

   1 Index: linux-2.6.25.4/arch/mips/mm/init.c
   2 ===================================================================
   3 --- linux-2.6.25.4.orig/arch/mips/mm/init.c
   4 +++ linux-2.6.25.4/arch/mips/mm/init.c
   5 @@ -211,7 +211,7 @@ void copy_user_highpage(struct page *to,
   6         void *vfrom, *vto;
   7
   8         vto = kmap_atomic(to, KM_USER1);
   9 -       if (cpu_has_dc_aliases &&
  10 +       if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
  11             page_mapped(from) && !Page_dcache_dirty(from)) {
  12                 vfrom = kmap_coherent(from, vaddr);
  13                 copy_page(vto, vfrom);
  14 @@ -235,7 +235,7 @@ void copy_to_user_page(struct vm_area_st
  15         struct page *page, unsigned long vaddr, void *dst, const void *src,
  16         unsigned long len)
  17  {
  18 -       if (cpu_has_dc_aliases &&
  19 +       if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
  20             page_mapped(page) && !Page_dcache_dirty(page)) {
  21                 void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
  22                 memcpy(vto, src, len);
  23 @@ -255,7 +255,7 @@ void copy_from_user_page(struct vm_area_
  24         struct page *page, unsigned long vaddr, void *dst, const void *src,
  25         unsigned long len)
  26  {
  27 -       if (cpu_has_dc_aliases &&
  28 +       if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
  29             page_mapped(page) && !Page_dcache_dirty(page)) {
  30                 void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
  31                 memcpy(dst, vfrom, len);
  32 Index: linux-2.6.25.4/include/asm-mips/mach-bcm47xx/cpu-feature-overrides.h
  33 ===================================================================
  34 --- /dev/null
  35 +++ linux-2.6.25.4/include/asm-mips/mach-bcm47xx/cpu-feature-overrides.h
  36 @@ -0,0 +1,13 @@
  37 +/*
  38 + * This file is subject to the terms and conditions of the GNU General Public
  39 + * License.  See the file "COPYING" in the main directory of this archive
  40 + * for more details.
  41 + *
  42 + * Copyright (C) 2005 Ralf Baechle (ralf@linux-mips.org)
  43 + */
  44 +#ifndef __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H
  45 +#define __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H
  46 +
  47 +#define cpu_use_kmap_coherent  0
  48 +
  49 +#endif /* __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H */
  50 Index: linux-2.6.25.4/include/asm-mips/cpu-features.h
  51 ===================================================================
  52 --- linux-2.6.25.4.orig/include/asm-mips/cpu-features.h
  53 +++ linux-2.6.25.4/include/asm-mips/cpu-features.h
  54 @@ -101,6 +101,9 @@
  55  #ifndef cpu_has_pindexed_dcache
  56  #define cpu_has_pindexed_dcache        (cpu_data[0].dcache.flags & MIPS_CACHE_PINDEX)
  57  #endif
  58 +#ifndef cpu_use_kmap_coherent
  59 +#define cpu_use_kmap_coherent 1
  60 +#endif
  61
  62  /*
  63   * I-Cache snoops remote store.  This only matters on SMP.  Some multiprocessors
  64 Index: linux-2.6.25.4/arch/mips/mm/c-r4k.c
  65 ===================================================================
  66 --- linux-2.6.25.4.orig/arch/mips/mm/c-r4k.c
  67 +++ linux-2.6.25.4/arch/mips/mm/c-r4k.c
  68 @@ -484,7 +484,7 @@ static inline void local_r4k_flush_cache
  69                  * Use kmap_coherent or kmap_atomic to do flushes for
  70                  * another ASID than the current one.
  71                  */
  72 -               if (cpu_has_dc_aliases)
  73 +               if (cpu_has_dc_aliases && cpu_use_kmap_coherent)
  74                         vaddr = kmap_coherent(page, addr);
  75                 else
  76                         vaddr = kmap_atomic(page, KM_USER0);
  77 @@ -505,7 +505,7 @@ static inline void local_r4k_flush_cache
  78         }
  79
  80         if (vaddr) {
  81 -               if (cpu_has_dc_aliases)
  82 +               if (cpu_has_dc_aliases && cpu_use_kmap_coherent)
  83                         kunmap_coherent();
  84                 else
  85                         kunmap_atomic(vaddr, KM_USER0);