Hi Daniel,
2014-03-31 12:59 GMT-07:00 Daniel <[email protected]>:
> fiq broadcast DMA cache maintenance is needed for ARM11MPCore, the
> to-be-added 'oxnas' hardware target use that core.
Missing signed-off-by tags. Full name for Signed-off-by tags will be needed.
Did you get upstream blessing on this?
>
> ---
> .../315-arm_introduce-dma-fiq-irq-broadcast.patch | 62
> ++++++++++++++++++++++
> 1 file changed, 62 insertions(+)
> create mode 100644
> target/linux/generic/patches-3.13/315-arm_introduce-dma-fiq-irq-broadcast.patch
>
> diff --git
> a/target/linux/generic/patches-3.13/315-arm_introduce-dma-fiq-irq-broadcast.patch
>
> b/target/linux/generic/patches-3.13/315-arm_introduce-dma-fiq-irq-broadcast.patch
> new file mode 100644
> index 0000000..d390534
> --- /dev/null
> +++
> b/target/linux/generic/patches-3.13/315-arm_introduce-dma-fiq-irq-broadcast.patch
> @@ -0,0 +1,62 @@
> +Index: linux-3.13.7/arch/arm/include/asm/glue-cache.h
> +===================================================================
> +--- linux-3.13.7.orig/arch/arm/include/asm/glue-cache.h
> ++++ linux-3.13.7/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
> +Index: linux-3.13.7/arch/arm/mm/Kconfig
> +===================================================================
> +--- linux-3.13.7.orig/arch/arm/mm/Kconfig
> ++++ linux-3.13.7/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
> +
> +Index: linux-3.13.7/arch/arm/mm/flush.c
> +===================================================================
> +--- linux-3.13.7.orig/arch/arm/mm/flush.c
> ++++ linux-3.13.7/arch/arm/mm/flush.c
> +@@ -291,7 +291,11 @@ 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 {
> --
> 1.9.0
>
>
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>
--
Florian
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