Move the vm_area handling into __iommu_dma_mmap, which is renamed to iommu_dma_mmap_remap.
Inline __iommu_dma_mmap_pfn into the main function to simplify the code flow a bit. Signed-off-by: Christoph Hellwig <h...@lst.de> --- drivers/iommu/dma-iommu.c | 50 ++++++++++++++------------------------- 1 file changed, 18 insertions(+), 32 deletions(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index c320c52cdac4..ed2ef8409806 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -598,23 +598,27 @@ static struct page **__iommu_dma_alloc(struct device *dev, size_t size, } /** - * __iommu_dma_mmap - Map a buffer into provided user VMA - * @pages: Array representing buffer from __iommu_dma_alloc() + * iommu_dma_mmap_remap - Map a remapped page array into provided user VMA + * @cpu_addr: virtual address of the memory to be remapped * @size: Size of buffer in bytes * @vma: VMA describing requested userspace mapping * - * Maps the pages of the buffer in @pages into @vma. The caller is responsible + * Maps the pages pointed to by @cpu_addr into @vma. The caller is responsible * for verifying the correct size and protection of @vma beforehand. */ -static int __iommu_dma_mmap(struct page **pages, size_t size, +static int iommu_dma_mmap_remap(void *cpu_addr, size_t size, struct vm_area_struct *vma) { + struct vm_struct *area = find_vm_area(cpu_addr); unsigned long uaddr = vma->vm_start; unsigned int i, count = PAGE_ALIGN(size) >> PAGE_SHIFT; int ret = -ENXIO; + if (WARN_ON(!area || !area->pages)) + return -ENXIO; + for (i = vma->vm_pgoff; i < count && uaddr < vma->vm_end; i++) { - ret = vm_insert_page(vma, uaddr, pages[i]); + ret = vm_insert_page(vma, uaddr, area->pages[i]); if (ret) break; uaddr += PAGE_SIZE; @@ -1053,21 +1057,13 @@ static void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr, } } -static int __iommu_dma_mmap_pfn(struct vm_area_struct *vma, - unsigned long pfn, size_t size) -{ - return remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff, - vma->vm_end - vma->vm_start, - vma->vm_page_prot); -} - static int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size, unsigned long attrs) { unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT; unsigned long off = vma->vm_pgoff; - struct vm_struct *area; + unsigned long pfn; int ret; vma->vm_page_prot = arch_dma_mmap_pgprot(dev, vma->vm_page_prot, attrs); @@ -1078,25 +1074,15 @@ static int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma, if (off >= nr_pages || vma_pages(vma) > nr_pages - off) return -ENXIO; - if (!is_vmalloc_addr(cpu_addr)) { - unsigned long pfn = page_to_pfn(virt_to_page(cpu_addr)); - return __iommu_dma_mmap_pfn(vma, pfn, size); - } + if (is_vmalloc_addr(cpu_addr)) { + if (!(attrs & DMA_ATTR_FORCE_CONTIGUOUS)) + return iommu_dma_mmap_remap(cpu_addr, size, vma); + pfn = vmalloc_to_pfn(cpu_addr); + } else + pfn = page_to_pfn(virt_to_page(cpu_addr)); - if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) { - /* - * DMA_ATTR_FORCE_CONTIGUOUS allocations are always remapped, - * hence in the vmalloc space. - */ - unsigned long pfn = vmalloc_to_pfn(cpu_addr); - return __iommu_dma_mmap_pfn(vma, pfn, size); - } - - area = find_vm_area(cpu_addr); - if (WARN_ON(!area || !area->pages)) - return -ENXIO; - - return __iommu_dma_mmap(area->pages, size, vma); + return remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff, + vma_pages(vma) << PAGE_SHIFT, vma->vm_page_prot); } static int __iommu_dma_get_sgtable_page(struct sg_table *sgt, struct page *page, -- 2.20.1 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu