From c1f59375b3782f478ac2c488889abdc00dd8e25f Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Tue, 19 Jun 2018 09:04:55 +0200 Subject: parisc: use generic dma_noncoherent_ops Switch to the generic noncoherent direct mapping implementation. Fix sync_single_for_cpu to do skip the cache flush unless the transfer is to the device to match the more tested unmap_single path which should have the same cache coherency implications. Signed-off-by: Christoph Hellwig Signed-off-by: Helge Deller --- arch/parisc/kernel/pci-dma.c | 145 ++++--------------------------------------- 1 file changed, 11 insertions(+), 134 deletions(-) (limited to 'arch/parisc/kernel/pci-dma.c') diff --git a/arch/parisc/kernel/pci-dma.c b/arch/parisc/kernel/pci-dma.c index 1f85ca2c0c9e..04c48f1ef3fb 100644 --- a/arch/parisc/kernel/pci-dma.c +++ b/arch/parisc/kernel/pci-dma.c @@ -21,13 +21,12 @@ #include #include #include -#include #include #include #include #include -#include -#include +#include +#include #include #include /* for DMA_CHUNK_SIZE */ @@ -437,7 +436,7 @@ static void *pcx_dma_alloc(struct device *dev, size_t size, return addr; } -static void *pa11_dma_alloc(struct device *dev, size_t size, +void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) { @@ -447,7 +446,7 @@ static void *pa11_dma_alloc(struct device *dev, size_t size, return pcx_dma_alloc(dev, size, dma_handle, gfp, attrs); } -static void pa11_dma_free(struct device *dev, size_t size, void *vaddr, +void arch_dma_free(struct device *dev, size_t size, void *vaddr, dma_addr_t dma_handle, unsigned long attrs) { int order = get_order(size); @@ -462,142 +461,20 @@ static void pa11_dma_free(struct device *dev, size_t size, void *vaddr, free_pages((unsigned long)vaddr, get_order(size)); } -static dma_addr_t pa11_dma_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction direction, unsigned long attrs) +void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr, + size_t size, enum dma_data_direction dir) { - void *addr = page_address(page) + offset; - BUG_ON(direction == DMA_NONE); - - if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) - flush_kernel_dcache_range((unsigned long) addr, size); - - return virt_to_phys(addr); -} - -static void pa11_dma_unmap_page(struct device *dev, dma_addr_t dma_handle, - size_t size, enum dma_data_direction direction, - unsigned long attrs) -{ - BUG_ON(direction == DMA_NONE); - - if (attrs & DMA_ATTR_SKIP_CPU_SYNC) - return; - - if (direction == DMA_TO_DEVICE) - return; - - /* - * For PCI_DMA_FROMDEVICE this flush is not necessary for the - * simple map/unmap case. However, it IS necessary if if - * pci_dma_sync_single_* has been called and the buffer reused. - */ - - flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size); + flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size); } -static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist, - int nents, enum dma_data_direction direction, - unsigned long attrs) +void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr, + size_t size, enum dma_data_direction dir) { - int i; - struct scatterlist *sg; - - BUG_ON(direction == DMA_NONE); - - for_each_sg(sglist, sg, nents, i) { - unsigned long vaddr = (unsigned long)sg_virt(sg); - - sg_dma_address(sg) = (dma_addr_t) virt_to_phys(vaddr); - sg_dma_len(sg) = sg->length; - - if (attrs & DMA_ATTR_SKIP_CPU_SYNC) - continue; - - flush_kernel_dcache_range(vaddr, sg->length); - } - return nents; + flush_kernel_dcache_range((unsigned long)phys_to_virt(paddr), size); } -static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, - int nents, enum dma_data_direction direction, - unsigned long attrs) -{ - int i; - struct scatterlist *sg; - - BUG_ON(direction == DMA_NONE); - - if (attrs & DMA_ATTR_SKIP_CPU_SYNC) - return; - - if (direction == DMA_TO_DEVICE) - return; - - /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ - - for_each_sg(sglist, sg, nents, i) - flush_kernel_dcache_range(sg_virt(sg), sg->length); -} - -static void pa11_dma_sync_single_for_cpu(struct device *dev, - dma_addr_t dma_handle, size_t size, - enum dma_data_direction direction) -{ - BUG_ON(direction == DMA_NONE); - - flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), - size); -} - -static void pa11_dma_sync_single_for_device(struct device *dev, - dma_addr_t dma_handle, size_t size, - enum dma_data_direction direction) -{ - BUG_ON(direction == DMA_NONE); - - flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), - size); -} - -static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) -{ - int i; - struct scatterlist *sg; - - /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ - - for_each_sg(sglist, sg, nents, i) - flush_kernel_dcache_range(sg_virt(sg), sg->length); -} - -static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction) -{ - int i; - struct scatterlist *sg; - - /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ - - for_each_sg(sglist, sg, nents, i) - flush_kernel_dcache_range(sg_virt(sg), sg->length); -} - -static void pa11_dma_cache_sync(struct device *dev, void *vaddr, size_t size, +void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size, enum dma_data_direction direction) { flush_kernel_dcache_range((unsigned long)vaddr, size); } - -const struct dma_map_ops pa11_dma_ops = { - .alloc = pa11_dma_alloc, - .free = pa11_dma_free, - .map_page = pa11_dma_map_page, - .unmap_page = pa11_dma_unmap_page, - .map_sg = pa11_dma_map_sg, - .unmap_sg = pa11_dma_unmap_sg, - .sync_single_for_cpu = pa11_dma_sync_single_for_cpu, - .sync_single_for_device = pa11_dma_sync_single_for_device, - .sync_sg_for_cpu = pa11_dma_sync_sg_for_cpu, - .sync_sg_for_device = pa11_dma_sync_sg_for_device, - .cache_sync = pa11_dma_cache_sync, -}; -- cgit v1.2.3