65 lines
2.2 KiB
Diff
65 lines
2.2 KiB
Diff
--- a/arch/arm/include/asm/glue-cache.h
|
|
+++ b/arch/arm/include/asm/glue-cache.h
|
|
@@ -156,11 +156,19 @@ extern inline void nop_dma_unmap_area(co
|
|
#define __cpuc_flush_user_range __glue(_CACHE,_flush_user_cache_range)
|
|
#define __cpuc_coherent_kern_range __glue(_CACHE,_coherent_kern_range)
|
|
#define __cpuc_coherent_user_range __glue(_CACHE,_coherent_user_range)
|
|
+#ifndef CONFIG_DMA_CACHE_FIQ_BROADCAST
|
|
#define __cpuc_flush_dcache_area __glue(_CACHE,_flush_kern_dcache_area)
|
|
|
|
#define dmac_map_area __glue(_CACHE,_dma_map_area)
|
|
#define dmac_unmap_area __glue(_CACHE,_dma_unmap_area)
|
|
#define dmac_flush_range __glue(_CACHE,_dma_flush_range)
|
|
+#else
|
|
+#define __cpuc_flush_dcache_area __glue(fiq,_flush_kern_dcache_area)
|
|
+
|
|
+#define dmac_map_area __glue(fiq,_dma_map_area)
|
|
+#define dmac_unmap_area __glue(fiq,_dma_unmap_area)
|
|
+#define dmac_flush_range __glue(fiq,_dma_flush_range)
|
|
+#endif /* CONFIG_DMA_CACHE_FIQ_BROADCAST */
|
|
#endif
|
|
|
|
#endif
|
|
--- a/arch/arm/mm/Kconfig
|
|
+++ b/arch/arm/mm/Kconfig
|
|
@@ -844,6 +844,17 @@ config DMA_CACHE_RWFO
|
|
in hardware, other workarounds are needed (e.g. cache
|
|
maintenance broadcasting in software via FIQ).
|
|
|
|
+config DMA_CACHE_FIQ_BROADCAST
|
|
+ bool "Enable fiq broadcast DMA cache maintenance"
|
|
+ depends on CPU_V6K && SMP
|
|
+ select FIQ
|
|
+ help
|
|
+ The Snoop Control Unit on ARM11MPCore does not detect the
|
|
+ cache maintenance operations and the dma_{map,unmap}_area()
|
|
+ functions may leave stale cache entries on other CPUs. By
|
|
+ enabling this option, fiq broadcast in the ARMv6
|
|
+ DMA cache maintenance functions is performed.
|
|
+
|
|
config OUTER_CACHE
|
|
bool
|
|
|
|
--- a/arch/arm/mm/flush.c
|
|
+++ b/arch/arm/mm/flush.c
|
|
@@ -281,6 +281,7 @@ void __sync_icache_dcache(pte_t pteval)
|
|
void flush_dcache_page(struct page *page)
|
|
{
|
|
struct address_space *mapping;
|
|
+ bool skip_broadcast = true;
|
|
|
|
/*
|
|
* The zero page is never written to, so never has any dirty
|
|
@@ -291,7 +292,10 @@ void flush_dcache_page(struct page *page
|
|
|
|
mapping = page_mapping(page);
|
|
|
|
- if (!cache_ops_need_broadcast() &&
|
|
+#ifndef CONFIG_DMA_CACHE_FIQ_BROADCAST
|
|
+ skip_broadcast = !cache_ops_need_broadcast();
|
|
+#endif
|
|
+ if (skip_broadcast &&
|
|
mapping && !page_mapped(page))
|
|
clear_bit(PG_dcache_clean, &page->flags);
|
|
else {
|