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- From: Jeff Hansen <jhansen@cardaccess-inc.com>
- Subject: [PATCH] kmap_coherent
- On ASUS WL-500gP there are some "Data bus error"s when executing simple
- commands liks "ps" or "cat /proc/1/cmdline".
- This fixes OpenWrt ticket #1485: https://dev.openwrt.org/ticket/1485
- ---
- --- a/arch/mips/include/asm/cpu-features.h
- +++ b/arch/mips/include/asm/cpu-features.h
- @@ -158,6 +158,9 @@
- #ifndef cpu_has_local_ebase
- #define cpu_has_local_ebase 1
- #endif
- +#ifndef cpu_use_kmap_coherent
- +#define cpu_use_kmap_coherent 1
- +#endif
-
- /*
- * I-Cache snoops remote store. This only matters on SMP. Some multiprocessors
- --- a/arch/mips/include/asm/mach-bcm47xx/cpu-feature-overrides.h
- +++ b/arch/mips/include/asm/mach-bcm47xx/cpu-feature-overrides.h
- @@ -79,4 +79,6 @@
- #define cpu_scache_line_size() 0
- #define cpu_has_vz 0
-
- +#define cpu_use_kmap_coherent 0
- +
- #endif /* __ASM_MACH_BCM47XX_CPU_FEATURE_OVERRIDES_H */
- --- a/arch/mips/mm/c-r4k.c
- +++ b/arch/mips/mm/c-r4k.c
- @@ -600,7 +600,7 @@ static inline void local_r4k_flush_cache
- */
- map_coherent = (cpu_has_dc_aliases &&
- page_mapped(page) && !Page_dcache_dirty(page));
- - if (map_coherent)
- + if (map_coherent && cpu_use_kmap_coherent)
- vaddr = kmap_coherent(page, addr);
- else
- vaddr = kmap_atomic(page);
- @@ -625,7 +625,7 @@ static inline void local_r4k_flush_cache
- }
-
- if (vaddr) {
- - if (map_coherent)
- + if (map_coherent && cpu_use_kmap_coherent)
- kunmap_coherent();
- else
- kunmap_atomic(vaddr);
- --- a/arch/mips/mm/init.c
- +++ b/arch/mips/mm/init.c
- @@ -160,7 +160,7 @@ void copy_user_highpage(struct page *to,
- void *vfrom, *vto;
-
- vto = kmap_atomic(to);
- - if (cpu_has_dc_aliases &&
- + if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
- page_mapped(from) && !Page_dcache_dirty(from)) {
- vfrom = kmap_coherent(from, vaddr);
- copy_page(vto, vfrom);
- @@ -182,7 +182,7 @@ void copy_to_user_page(struct vm_area_st
- struct page *page, unsigned long vaddr, void *dst, const void *src,
- unsigned long len)
- {
- - if (cpu_has_dc_aliases &&
- + if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
- page_mapped(page) && !Page_dcache_dirty(page)) {
- void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
- memcpy(vto, src, len);
- @@ -200,7 +200,7 @@ void copy_from_user_page(struct vm_area_
- struct page *page, unsigned long vaddr, void *dst, const void *src,
- unsigned long len)
- {
- - if (cpu_has_dc_aliases &&
- + if (cpu_has_dc_aliases && cpu_use_kmap_coherent &&
- page_mapped(page) && !Page_dcache_dirty(page)) {
- void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
- memcpy(dst, vfrom, len);
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