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author | Robin Murphy <robin.murphy@arm.com> | 2019-05-20 10:29:33 +0300 |
---|---|---|
committer | Joerg Roedel <jroedel@suse.de> | 2019-05-27 18:31:11 +0300 |
commit | 4c360acee9298d048921bec3e21c4183d06cb43a (patch) | |
tree | c1133d965fa8c652ed26162eac6b9ca33d727b76 /drivers/iommu | |
parent | 796a08cf16054ef93783ca8ab4aec2469c3307c1 (diff) | |
download | linux-4c360acee9298d048921bec3e21c4183d06cb43a.tar.xz |
iommu/dma: Factor out remapped pages lookup
Since we duplicate the find_vm_area() logic a few times in places where
we only care aboute the pages, factor out a helper to abstract it.
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
[hch: don't warn when not finding a region, as we'll rely on that later]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r-- | drivers/iommu/dma-iommu.c | 32 |
1 files changed, 20 insertions, 12 deletions
diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 498e319d6607..5e81165e6755 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -554,6 +554,15 @@ 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_free - Free a buffer allocated by __iommu_dma_alloc() * @dev: Device which owns this buffer @@ -1042,11 +1051,11 @@ static void iommu_dma_free(struct device *dev, size_t size, void *cpu_addr, dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT); dma_common_free_remap(cpu_addr, size, VM_USERMAP); } else if (is_vmalloc_addr(cpu_addr)){ - struct vm_struct *area = find_vm_area(cpu_addr); + struct page **pages = __iommu_dma_get_pages(cpu_addr); - if (WARN_ON(!area || !area->pages)) + if (!pages) return; - __iommu_dma_free(dev, area->pages, iosize, &handle); + __iommu_dma_free(dev, pages, iosize, &handle); dma_common_free_remap(cpu_addr, size, VM_USERMAP); } else { __iommu_dma_unmap(dev, handle, iosize); @@ -1078,7 +1087,7 @@ static int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma, { unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT; unsigned long off = vma->vm_pgoff; - struct vm_struct *area; + struct page **pages; int ret; vma->vm_page_prot = arch_dma_mmap_pgprot(dev, vma->vm_page_prot, attrs); @@ -1103,11 +1112,10 @@ static int iommu_dma_mmap(struct device *dev, struct vm_area_struct *vma, return __iommu_dma_mmap_pfn(vma, pfn, size); } - area = find_vm_area(cpu_addr); - if (WARN_ON(!area || !area->pages)) + pages = __iommu_dma_get_pages(cpu_addr); + if (!pages) return -ENXIO; - - return __iommu_dma_mmap(area->pages, size, vma); + return __iommu_dma_mmap(pages, size, vma); } static int __iommu_dma_get_sgtable_page(struct sg_table *sgt, struct page *page, @@ -1125,7 +1133,7 @@ static int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt, unsigned long attrs) { unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; - struct vm_struct *area = find_vm_area(cpu_addr); + struct page **pages; if (!is_vmalloc_addr(cpu_addr)) { struct page *page = virt_to_page(cpu_addr); @@ -1141,10 +1149,10 @@ static int iommu_dma_get_sgtable(struct device *dev, struct sg_table *sgt, return __iommu_dma_get_sgtable_page(sgt, page, size); } - if (WARN_ON(!area || !area->pages)) + pages = __iommu_dma_get_pages(cpu_addr); + if (!pages) return -ENXIO; - - return sg_alloc_table_from_pages(sgt, area->pages, count, 0, size, + return sg_alloc_table_from_pages(sgt, pages, count, 0, size, GFP_KERNEL); } |