diff options
Diffstat (limited to 'arch/mips/mm/dma-default.c')
| -rw-r--r-- | arch/mips/mm/dma-default.c | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c index b2eadd6fa9a1..a39c36af97ad 100644 --- a/arch/mips/mm/dma-default.c +++ b/arch/mips/mm/dma-default.c @@ -11,7 +11,7 @@ #include <linux/types.h> #include <linux/dma-mapping.h> #include <linux/mm.h> -#include <linux/module.h> +#include <linux/export.h> #include <linux/scatterlist.h> #include <linux/string.h> #include <linux/gfp.h> @@ -24,14 +24,15 @@ #include <dma-coherence.h> -#ifdef CONFIG_DMA_MAYBE_COHERENT -int coherentio = 0; /* User defined DMA coherency from command line. */ +#if defined(CONFIG_DMA_MAYBE_COHERENT) && !defined(CONFIG_DMA_PERDEV_COHERENT) +/* User defined DMA coherency from command line. */ +enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT; EXPORT_SYMBOL_GPL(coherentio); int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */ static int __init setcoherentio(char *str) { - coherentio = 1; + coherentio = IO_COHERENCE_ENABLED; pr_info("Hardware DMA cache coherency (command line)\n"); return 0; } @@ -39,7 +40,7 @@ early_param("coherentio", setcoherentio); static int __init setnocoherentio(char *str) { - coherentio = 0; + coherentio = IO_COHERENCE_DISABLED; pr_info("Software DMA cache coherency (command line)\n"); return 0; } @@ -160,8 +161,7 @@ static void *mips_dma_alloc_coherent(struct device *dev, size_t size, *dma_handle = plat_map_dma_mem(dev, ret, size); if (!plat_device_is_coherent(dev)) { dma_cache_wback_inv((unsigned long) ret, size); - if (!hw_coherentio) - ret = UNCAC_ADDR(ret); + ret = UNCAC_ADDR(ret); } return ret; @@ -189,7 +189,7 @@ static void mips_dma_free_coherent(struct device *dev, size_t size, void *vaddr, plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL); - if (!plat_device_is_coherent(dev) && !hw_coherentio) + if (!plat_device_is_coherent(dev)) addr = CAC_ADDR(addr); page = virt_to_page((void *) addr); @@ -209,7 +209,7 @@ static int mips_dma_mmap(struct device *dev, struct vm_area_struct *vma, unsigned long pfn; int ret = -ENXIO; - if (!plat_device_is_coherent(dev) && !hw_coherentio) + if (!plat_device_is_coherent(dev)) addr = CAC_ADDR(addr); pfn = page_to_pfn(virt_to_page((void *)addr)); @@ -293,7 +293,7 @@ static inline void __dma_sync(struct page *page, static void mips_dma_unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size, enum dma_data_direction direction, unsigned long attrs) { - if (cpu_needs_post_dma_flush(dev)) + if (cpu_needs_post_dma_flush(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) __dma_sync(dma_addr_to_page(dev, dma_addr), dma_addr & ~PAGE_MASK, size, direction); plat_post_dma_flush(dev); @@ -307,7 +307,8 @@ static int mips_dma_map_sg(struct device *dev, struct scatterlist *sglist, struct scatterlist *sg; for_each_sg(sglist, sg, nents, i) { - if (!plat_device_is_coherent(dev)) + if (!plat_device_is_coherent(dev) && + !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) __dma_sync(sg_page(sg), sg->offset, sg->length, direction); #ifdef CONFIG_NEED_SG_DMA_LENGTH @@ -324,7 +325,7 @@ static dma_addr_t mips_dma_map_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction direction, unsigned long attrs) { - if (!plat_device_is_coherent(dev)) + if (!plat_device_is_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) __dma_sync(page, offset, size, direction); return plat_map_dma_mem_page(dev, page) + offset; @@ -339,6 +340,7 @@ static void mips_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, for_each_sg(sglist, sg, nhwentries, i) { if (!plat_device_is_coherent(dev) && + !(attrs & DMA_ATTR_SKIP_CPU_SYNC) && direction != DMA_TO_DEVICE) __dma_sync(sg_page(sg), sg->offset, sg->length, direction); |
