Messages in this thread Patch in this message | | | From | Christoph Hellwig <> | Subject | [PATCH 22/26] iommu/dma: Refactor iommu_dma_mmap | Date | Mon, 22 Apr 2019 19:59:38 +0200 |
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Inline __iommu_dma_mmap_pfn into the main function, and use the fact that __iommu_dma_get_pages return NULL for remapped contigous allocations to simplify the code flow a bit.
Signed-off-by: Christoph Hellwig <hch@lst.de> --- drivers/iommu/dma-iommu.c | 36 +++++++++++------------------------- 1 file changed, 11 insertions(+), 25 deletions(-)
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 138b85e675c8..8fc6098c1eeb 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -1025,21 +1025,12 @@ static void *iommu_dma_alloc(struct device *dev, size_t size, return 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 page **pages; + unsigned long pfn, off = vma->vm_pgoff; int ret; vma->vm_page_prot = arch_dma_mmap_pgprot(dev, vma->vm_page_prot, attrs); @@ -1050,24 +1041,19 @@ 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)) { + struct page **pages = __iommu_dma_get_pages(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); + if (pages) + return __iommu_dma_mmap(pages, size, vma); + pfn = vmalloc_to_pfn(cpu_addr); + } else { + pfn = page_to_pfn(virt_to_page(cpu_addr)); } - pages = __iommu_dma_get_pages(cpu_addr); - if (WARN_ON_ONCE(!pages)) - return -ENXIO; - return __iommu_dma_mmap(pages, size, vma); + return remap_pfn_range(vma, vma->vm_start, pfn + off, + vma->vm_end - vma->vm_start, + vma->vm_page_prot); } static int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt, -- 2.20.1
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