diff options
Diffstat (limited to 'target/linux/oxnas/patches-4.4/010-arm_introduce-dma-fiq-irq-broadcast.patch')
| -rw-r--r-- | target/linux/oxnas/patches-4.4/010-arm_introduce-dma-fiq-irq-broadcast.patch | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/target/linux/oxnas/patches-4.4/010-arm_introduce-dma-fiq-irq-broadcast.patch b/target/linux/oxnas/patches-4.4/010-arm_introduce-dma-fiq-irq-broadcast.patch new file mode 100644 index 0000000000..b59c06e2ab --- /dev/null +++ b/target/linux/oxnas/patches-4.4/010-arm_introduce-dma-fiq-irq-broadcast.patch @@ -0,0 +1,68 @@ +--- a/arch/arm/include/asm/glue-cache.h ++++ b/arch/arm/include/asm/glue-cache.h +@@ -156,9 +156,15 @@ 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_flush_range __glue(_CACHE,_dma_flush_range) ++#else ++#define __cpuc_flush_dcache_area __glue(fiq,_flush_kern_dcache_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 +@@ -866,6 +866,17 @@ 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 +@@ -329,7 +329,11 @@ void flush_dcache_page(struct page *page + + mapping = page_mapping(page); + ++#ifndef CONFIG_DMA_CACHE_FIQ_BROADCAST + if (!cache_ops_need_broadcast() && ++#else ++ if ( ++#endif + mapping && !page_mapped(page)) + clear_bit(PG_dcache_clean, &page->flags); + else { +--- a/arch/arm/mm/dma.h ++++ b/arch/arm/mm/dma.h +@@ -4,8 +4,13 @@ + #include <asm/glue-cache.h> + + #ifndef MULTI_CACHE ++#ifndef CONFIG_DMA_CACHE_FIQ_BROADCAST + #define dmac_map_area __glue(_CACHE,_dma_map_area) + #define dmac_unmap_area __glue(_CACHE,_dma_unmap_area) ++#else ++#define dmac_map_area __glue(fiq,_dma_map_area) ++#define dmac_unmap_area __glue(fiq,_dma_unmap_area) ++#endif /* CONFIG_DMA_CACHE_FIQ_BROADCAST */ + + /* + * These are private to the dma-mapping API. Do not use directly. |