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- --- a/arch/arm/include/asm/glue-cache.h
- +++ b/arch/arm/include/asm/glue-cache.h
- @@ -156,11 +156,19 @@ static 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
- @@ -304,6 +304,7 @@ 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
- @@ -314,7 +315,10 @@ 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 {
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