mirror of https://github.com/hak5/openwrt.git
79 lines
2.5 KiB
Diff
79 lines
2.5 KiB
Diff
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
|
|
@@ -160,6 +160,9 @@
|
|
#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
|
|
@@ -645,7 +645,7 @@ 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);
|
|
@@ -670,7 +670,7 @@ 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
|
|
@@ -164,7 +164,7 @@ 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);
|
|
@@ -186,7 +186,7 @@ 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);
|
|
@@ -204,7 +204,7 @@ 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);
|