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| author | Christoph Hellwig <hch@lst.de> | 2019-05-20 09:29:43 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2019-05-27 17:31:11 +0200 |
| commit | 3fb3378bb1eb2905065211ab51a7bcc2c5e7bd29 (patch) | |
| tree | 66fb2035ecb4af0af02c51c50b0f643fae640247 /drivers/iommu | |
| parent | ee1ef05d02b03118e4c197e1193329f5b64246b7 (diff) | |
| download | linux-3fb3378bb1eb2905065211ab51a7bcc2c5e7bd29.tar.bz2 | |
iommu/dma: Refactor iommu_dma_get_sgtable
Inline __iommu_dma_get_sgtable_page 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>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/dma-iommu.c | 45 |
1 files changed, 17 insertions, 28 deletions
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 84761adbb1d4..fa95794868a4 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -1097,42 +1097,31 @@ static int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma, return __iommu_dma_mmap(pages, size, vma); } -static int __iommu_dma_get_sgtable_page(struct sg_table *sgt, struct page *page, - size_t size) -{ - int ret = sg_alloc_table(sgt, 1, GFP_KERNEL); - - if (!ret) - sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0); - return ret; -} - static int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr, size_t size, unsigned long attrs) { - unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; - struct page **pages; + struct page *page; + int ret; - if (!is_vmalloc_addr(cpu_addr)) { - struct page *page = virt_to_page(cpu_addr); - return __iommu_dma_get_sgtable_page(sgt, page, 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. - */ - struct page *page = vmalloc_to_page(cpu_addr); - return __iommu_dma_get_sgtable_page(sgt, page, size); + if (pages) { + return sg_alloc_table_from_pages(sgt, pages, + PAGE_ALIGN(size) >> PAGE_SHIFT, + 0, size, GFP_KERNEL); + } + + page = vmalloc_to_page(cpu_addr); + } else { + page = virt_to_page(cpu_addr); } - pages = __iommu_dma_get_pages(cpu_addr); - if (!pages) - return -ENXIO; - return sg_alloc_table_from_pages(sgt, pages, count, 0, size, - GFP_KERNEL); + ret = sg_alloc_table(sgt, 1, GFP_KERNEL); + if (!ret) + sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0); + return ret; } static const struct dma_map_ops iommu_dma_ops = { |