diff options
Diffstat (limited to 'arch/arm64')
| -rw-r--r-- | arch/arm64/mm/dma-mapping.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c index 88fbc5e5bae7..81eea3d3249f 100644 --- a/arch/arm64/mm/dma-mapping.c +++ b/arch/arm64/mm/dma-mapping.c @@ -221,9 +221,52 @@ static void __swiotlb_sync_sg_for_device(struct device *dev, sg->length, dir); } +/* vma->vm_page_prot must be set appropriately before calling this function */ +static int __dma_common_mmap(struct device *dev, struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, size_t size) +{ + int ret = -ENXIO; + unsigned long nr_vma_pages = (vma->vm_end - vma->vm_start) >> + PAGE_SHIFT; + unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT; + unsigned long pfn = dma_to_phys(dev, dma_addr) >> PAGE_SHIFT; + unsigned long off = vma->vm_pgoff; + + if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret)) + return ret; + + if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) { + ret = remap_pfn_range(vma, vma->vm_start, + pfn + off, + vma->vm_end - vma->vm_start, + vma->vm_page_prot); + } + + return ret; +} + +static int __swiotlb_mmap_noncoherent(struct device *dev, + struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, size_t size, + struct dma_attrs *attrs) +{ + vma->vm_page_prot = pgprot_dmacoherent(vma->vm_page_prot); + return __dma_common_mmap(dev, vma, cpu_addr, dma_addr, size); +} + +static int __swiotlb_mmap_coherent(struct device *dev, + struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, size_t size, + struct dma_attrs *attrs) +{ + /* Just use whatever page_prot attributes were specified */ + return __dma_common_mmap(dev, vma, cpu_addr, dma_addr, size); +} + struct dma_map_ops noncoherent_swiotlb_dma_ops = { .alloc = __dma_alloc_noncoherent, .free = __dma_free_noncoherent, + .mmap = __swiotlb_mmap_noncoherent, .map_page = __swiotlb_map_page, .unmap_page = __swiotlb_unmap_page, .map_sg = __swiotlb_map_sg_attrs, @@ -240,6 +283,7 @@ EXPORT_SYMBOL(noncoherent_swiotlb_dma_ops); struct dma_map_ops coherent_swiotlb_dma_ops = { .alloc = __dma_alloc_coherent, .free = __dma_free_coherent, + .mmap = __swiotlb_mmap_coherent, .map_page = swiotlb_map_page, .unmap_page = swiotlb_unmap_page, .map_sg = swiotlb_map_sg_attrs, |