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| author | Christoph Hellwig <hch@lst.de> | 2019-06-03 09:14:31 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-09-04 11:13:20 +0200 |
| commit | 5cf4537975bbd5691b9ddd015d540bb92f61e322 (patch) | |
| tree | f77c8831902447d5c079eb8d36d4819d426d6e06 /drivers/iommu/dma-iommu.c | |
| parent | 512317401f6a337e617ec284d20dec5fa3a951ec (diff) | |
| download | lwn-5cf4537975bbd5691b9ddd015d540bb92f61e322.tar.gz lwn-5cf4537975bbd5691b9ddd015d540bb92f61e322.zip | |
dma-mapping: introduce a dma_common_find_pages helper
A helper to find the backing page array based on a virtual address.
This also ensures we do the same vm_flags check everywhere instead
of slightly different or missing ones in a few places.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/iommu/dma-iommu.c')
| -rw-r--r-- | drivers/iommu/dma-iommu.c | 15 |
1 files changed, 3 insertions, 12 deletions
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 949e341bf2f3..e8482c57c24e 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -541,15 +541,6 @@ static struct page **__iommu_dma_alloc_pages(struct device *dev, return pages; } -static struct page **__iommu_dma_get_pages(void *cpu_addr) -{ - struct vm_struct *area = find_vm_area(cpu_addr); - - if (!area || !area->pages) - return NULL; - return area->pages; -} - /** * iommu_dma_alloc_remap - Allocate and map a buffer contiguous in IOVA space * @dev: Device to allocate memory for. Must be a real device @@ -938,7 +929,7 @@ static void __iommu_dma_free(struct device *dev, size_t size, void *cpu_addr) * If it the address is remapped, then it's either non-coherent * or highmem CMA, or an iommu_dma_alloc_remap() construction. */ - pages = __iommu_dma_get_pages(cpu_addr); + pages = dma_common_find_pages(cpu_addr); if (!pages) page = vmalloc_to_page(cpu_addr); dma_common_free_remap(cpu_addr, alloc_size); @@ -1045,7 +1036,7 @@ static int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma, return -ENXIO; if (IS_ENABLED(CONFIG_DMA_REMAP) && is_vmalloc_addr(cpu_addr)) { - struct page **pages = __iommu_dma_get_pages(cpu_addr); + struct page **pages = dma_common_find_pages(cpu_addr); if (pages) return __iommu_dma_mmap(pages, size, vma); @@ -1067,7 +1058,7 @@ static int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt, int ret; if (IS_ENABLED(CONFIG_DMA_REMAP) && is_vmalloc_addr(cpu_addr)) { - struct page **pages = __iommu_dma_get_pages(cpu_addr); + struct page **pages = dma_common_find_pages(cpu_addr); if (pages) { return sg_alloc_table_from_pages(sgt, pages, |