There is nothing really arm64 specific in the iommu_dma_ops
implementation, so move it to dma-iommu.c and keep a lot of symbols
self-contained. Note the implementation does depend on the
DMA_DIRECT_REMAP infrastructure for now, so we'll have to make the
DMA_IOMMU support depend on it, but this will be relaxed soon.
Signed-off-by: Christoph Hellwig
Acked-by: Robin Murphy
---
arch/arm64/mm/dma-mapping.c | 394 +--
drivers/iommu/Kconfig | 1 +
drivers/iommu/dma-iommu.c | 398 +---
include/linux/dma-iommu.h | 43 +---
4 files changed, 379 insertions(+), 457 deletions(-)
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
index 10a8852c8b6a..d1661f78eb4d 100644
--- a/arch/arm64/mm/dma-mapping.c
+++ b/arch/arm64/mm/dma-mapping.c
@@ -27,6 +27,7 @@
#include
#include
#include
+#include
#include
#include
#include
@@ -58,37 +59,6 @@ void arch_dma_prep_coherent(struct page *page, size_t size)
__dma_flush_area(page_address(page), size);
}
-#ifdef CONFIG_IOMMU_DMA
-static int __swiotlb_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 __swiotlb_mmap_pfn(struct vm_area_struct *vma,
- unsigned long pfn, size_t size)
-{
- int ret = -ENXIO;
- unsigned long nr_vma_pages = vma_pages(vma);
- unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
- unsigned long off = vma->vm_pgoff;
-
- if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) {
- ret = remap_pfn_range(vma, vma->vm_start,
- pfn + off,
- vma->vm_end - vma->vm_start,
- vma->vm_page_prot);
- }
-
- return ret;
-}
-#endif /* CONFIG_IOMMU_DMA */
-
static int __init arm64_dma_init(void)
{
WARN_TAINT(ARCH_DMA_MINALIGN < cache_line_size(),
@@ -100,374 +70,18 @@ static int __init arm64_dma_init(void)
arch_initcall(arm64_dma_init);
#ifdef CONFIG_IOMMU_DMA
-#include
-#include
-#include
-
-static void *__iommu_alloc_attrs(struct device *dev, size_t size,
-dma_addr_t *handle, gfp_t gfp,
-unsigned long attrs)
-{
- bool coherent = dev_is_dma_coherent(dev);
- int ioprot = dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs);
- size_t iosize = size;
- void *addr;
-
- if (WARN(!dev, "cannot create IOMMU mapping for unknown device\n"))
- return NULL;
-
- size = PAGE_ALIGN(size);
-
- /*
-* Some drivers rely on this, and we probably don't want the
-* possibility of stale kernel data being read by devices anyway.
-*/
- gfp |= __GFP_ZERO;
-
- if (!gfpflags_allow_blocking(gfp)) {
- struct page *page;
- /*
-* In atomic context we can't remap anything, so we'll only
-* get the virtually contiguous buffer we need by way of a
-* physically contiguous allocation.
-*/
- if (coherent) {
- page = alloc_pages(gfp, get_order(size));
- addr = page ? page_address(page) : NULL;
- } else {
- addr = dma_alloc_from_pool(size, , gfp);
- }
- if (!addr)
- return NULL;
-
- *handle = iommu_dma_map_page(dev, page, 0, iosize, ioprot);
- if (*handle == DMA_MAPPING_ERROR) {
- if (coherent)
- __free_pages(page, get_order(size));
- else
- dma_free_from_pool(addr, size);
- addr = NULL;
- }
- } else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
- pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs);
- struct page *page;
-
- page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
- get_order(size), gfp & __GFP_NOWARN);
- if (!page)
- return NULL;
-
- *handle = iommu_dma_map_page(dev, page, 0, iosize, ioprot);
- if (*handle == DMA_MAPPING_ERROR) {
- dma_release_from_contiguous(dev, page,
- size >> PAGE_SHIFT);
- return NULL;
- }
- addr = dma_common_contiguous_remap(page, size, VM_USERMAP,
- prot,
- __builtin_return_address(0));
-
