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arm64: Implement coherent DMA API based on swiotlb
This patch adds support for DMA API cache maintenance on SoCs without hardware device cache coherency. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Catalin Marinas
parent
3690951fc6
commit
7363590d2c
@ -84,6 +84,13 @@ static inline void flush_cache_page(struct vm_area_struct *vma,
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{
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}
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/*
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* Cache maintenance functions used by the DMA API. No to be used directly.
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*/
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extern void __dma_map_area(const void *, size_t, int);
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extern void __dma_unmap_area(const void *, size_t, int);
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extern void __dma_flush_range(const void *, const void *);
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/*
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* Copy user data from/to a page which is mapped into a different
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* processes address space. Really, we want to allow our "user
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@ -30,6 +30,8 @@
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#define DMA_ERROR_CODE (~(dma_addr_t)0)
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extern struct dma_map_ops *dma_ops;
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extern struct dma_map_ops coherent_swiotlb_dma_ops;
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extern struct dma_map_ops noncoherent_swiotlb_dma_ops;
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static inline struct dma_map_ops *__generic_dma_ops(struct device *dev)
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{
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@ -47,6 +49,11 @@ static inline struct dma_map_ops *get_dma_ops(struct device *dev)
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return __generic_dma_ops(dev);
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}
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static inline void set_dma_ops(struct device *dev, struct dma_map_ops *ops)
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{
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dev->archdata.dma_ops = ops;
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}
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#include <asm-generic/dma-mapping-common.h>
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static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
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@ -166,3 +166,81 @@ ENTRY(__flush_dcache_area)
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dsb sy
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ret
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ENDPROC(__flush_dcache_area)
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/*
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* __dma_inv_range(start, end)
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* - start - virtual start address of region
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* - end - virtual end address of region
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*/
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__dma_inv_range:
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dcache_line_size x2, x3
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sub x3, x2, #1
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bic x0, x0, x3
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bic x1, x1, x3
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1: dc ivac, x0 // invalidate D / U line
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add x0, x0, x2
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cmp x0, x1
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b.lo 1b
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dsb sy
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ret
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ENDPROC(__dma_inv_range)
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/*
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* __dma_clean_range(start, end)
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* - start - virtual start address of region
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* - end - virtual end address of region
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*/
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__dma_clean_range:
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dcache_line_size x2, x3
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sub x3, x2, #1
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bic x0, x0, x3
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1: dc cvac, x0 // clean D / U line
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add x0, x0, x2
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cmp x0, x1
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b.lo 1b
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dsb sy
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ret
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ENDPROC(__dma_clean_range)
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/*
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* __dma_flush_range(start, end)
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* - start - virtual start address of region
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* - end - virtual end address of region
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*/
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ENTRY(__dma_flush_range)
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dcache_line_size x2, x3
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sub x3, x2, #1
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bic x0, x0, x3
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1: dc civac, x0 // clean & invalidate D / U line
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add x0, x0, x2
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cmp x0, x1
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b.lo 1b
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dsb sy
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ret
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ENDPROC(__dma_flush_range)
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/*
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* __dma_map_area(start, size, dir)
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* - start - kernel virtual start address
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* - size - size of region
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* - dir - DMA direction
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*/
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ENTRY(__dma_map_area)
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add x1, x1, x0
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cmp w2, #DMA_FROM_DEVICE
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b.eq __dma_inv_range
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b __dma_clean_range
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ENDPROC(__dma_map_area)
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/*
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* __dma_unmap_area(start, size, dir)
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* - start - kernel virtual start address
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* - size - size of region
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* - dir - DMA direction
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*/
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ENTRY(__dma_unmap_area)
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add x1, x1, x0
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cmp w2, #DMA_TO_DEVICE
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b.ne __dma_inv_range
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ret
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ENDPROC(__dma_unmap_area)
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@ -78,7 +78,166 @@ static void __dma_free_coherent(struct device *dev, size_t size,
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}
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}
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static struct dma_map_ops coherent_swiotlb_dma_ops = {
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static void *__dma_alloc_noncoherent(struct device *dev, size_t size,
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dma_addr_t *dma_handle, gfp_t flags,
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struct dma_attrs *attrs)
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{
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struct page *page, **map;
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void *ptr, *coherent_ptr;
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int order, i;
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size = PAGE_ALIGN(size);
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order = get_order(size);
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ptr = __dma_alloc_coherent(dev, size, dma_handle, flags, attrs);
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if (!ptr)
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goto no_mem;
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map = kmalloc(sizeof(struct page *) << order, flags & ~GFP_DMA);
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if (!map)
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goto no_map;
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/* remove any dirty cache lines on the kernel alias */
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__dma_flush_range(ptr, ptr + size);
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/* create a coherent mapping */
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page = virt_to_page(ptr);
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for (i = 0; i < (size >> PAGE_SHIFT); i++)
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map[i] = page + i;
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coherent_ptr = vmap(map, size >> PAGE_SHIFT, VM_MAP,
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pgprot_dmacoherent(pgprot_default));
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kfree(map);
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if (!coherent_ptr)
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goto no_map;
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return coherent_ptr;
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no_map:
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__dma_free_coherent(dev, size, ptr, *dma_handle, attrs);
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no_mem:
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*dma_handle = ~0;
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return NULL;
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}
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static void __dma_free_noncoherent(struct device *dev, size_t size,
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void *vaddr, dma_addr_t dma_handle,
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struct dma_attrs *attrs)
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{
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void *swiotlb_addr = phys_to_virt(dma_to_phys(dev, dma_handle));
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vunmap(vaddr);
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__dma_free_coherent(dev, size, swiotlb_addr, dma_handle, attrs);
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}
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static dma_addr_t __swiotlb_map_page(struct device *dev, struct page *page,
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unsigned long offset, size_t size,
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enum dma_data_direction dir,
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struct dma_attrs *attrs)
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{
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dma_addr_t dev_addr;
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dev_addr = swiotlb_map_page(dev, page, offset, size, dir, attrs);
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__dma_map_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
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return dev_addr;
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}
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static void __swiotlb_unmap_page(struct device *dev, dma_addr_t dev_addr,
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size_t size, enum dma_data_direction dir,
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struct dma_attrs *attrs)
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{
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__dma_unmap_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
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swiotlb_unmap_page(dev, dev_addr, size, dir, attrs);
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}
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static int __swiotlb_map_sg_attrs(struct device *dev, struct scatterlist *sgl,
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int nelems, enum dma_data_direction dir,
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struct dma_attrs *attrs)
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{
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struct scatterlist *sg;
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int i, ret;
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ret = swiotlb_map_sg_attrs(dev, sgl, nelems, dir, attrs);
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for_each_sg(sgl, sg, ret, i)
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__dma_map_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
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sg->length, dir);
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return ret;
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}
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static void __swiotlb_unmap_sg_attrs(struct device *dev,
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struct scatterlist *sgl, int nelems,
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enum dma_data_direction dir,
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struct dma_attrs *attrs)
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{
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struct scatterlist *sg;
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int i;
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for_each_sg(sgl, sg, nelems, i)
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__dma_unmap_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
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sg->length, dir);
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swiotlb_unmap_sg_attrs(dev, sgl, nelems, dir, attrs);
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}
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static void __swiotlb_sync_single_for_cpu(struct device *dev,
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dma_addr_t dev_addr, size_t size,
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enum dma_data_direction dir)
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{
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__dma_unmap_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
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swiotlb_sync_single_for_cpu(dev, dev_addr, size, dir);
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}
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static void __swiotlb_sync_single_for_device(struct device *dev,
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dma_addr_t dev_addr, size_t size,
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enum dma_data_direction dir)
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{
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swiotlb_sync_single_for_device(dev, dev_addr, size, dir);
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__dma_map_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
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}
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static void __swiotlb_sync_sg_for_cpu(struct device *dev,
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struct scatterlist *sgl, int nelems,
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enum dma_data_direction dir)
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{
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struct scatterlist *sg;
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int i;
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for_each_sg(sgl, sg, nelems, i)
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__dma_unmap_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
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sg->length, dir);
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swiotlb_sync_sg_for_cpu(dev, sgl, nelems, dir);
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}
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static void __swiotlb_sync_sg_for_device(struct device *dev,
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struct scatterlist *sgl, int nelems,
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enum dma_data_direction dir)
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{
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struct scatterlist *sg;
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int i;
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swiotlb_sync_sg_for_device(dev, sgl, nelems, dir);
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for_each_sg(sgl, sg, nelems, i)
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__dma_map_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)),
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sg->length, dir);
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}
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struct dma_map_ops noncoherent_swiotlb_dma_ops = {
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.alloc = __dma_alloc_noncoherent,
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.free = __dma_free_noncoherent,
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.map_page = __swiotlb_map_page,
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.unmap_page = __swiotlb_unmap_page,
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.map_sg = __swiotlb_map_sg_attrs,
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.unmap_sg = __swiotlb_unmap_sg_attrs,
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.sync_single_for_cpu = __swiotlb_sync_single_for_cpu,
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.sync_single_for_device = __swiotlb_sync_single_for_device,
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.sync_sg_for_cpu = __swiotlb_sync_sg_for_cpu,
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.sync_sg_for_device = __swiotlb_sync_sg_for_device,
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.dma_supported = swiotlb_dma_supported,
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.mapping_error = swiotlb_dma_mapping_error,
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};
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EXPORT_SYMBOL(noncoherent_swiotlb_dma_ops);
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struct dma_map_ops coherent_swiotlb_dma_ops = {
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.alloc = __dma_alloc_coherent,
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.free = __dma_free_coherent,
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.map_page = swiotlb_map_page,
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@ -92,6 +251,7 @@ static struct dma_map_ops coherent_swiotlb_dma_ops = {
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.dma_supported = swiotlb_dma_supported,
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.mapping_error = swiotlb_dma_mapping_error,
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};
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EXPORT_SYMBOL(coherent_swiotlb_dma_ops);
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extern int swiotlb_late_init_with_default_size(size_t default_size);
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