sg->length, dir);
}
-static int __swiotlb_mmap(struct device *dev,
- struct vm_area_struct *vma,
- void *cpu_addr, dma_addr_t dma_addr, size_t size,
- unsigned long attrs)
+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->vm_end - vma->vm_start) >>
PAGE_SHIFT;
unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
- unsigned long pfn = dma_to_phys(dev, dma_addr) >> PAGE_SHIFT;
unsigned long off = vma->vm_pgoff;
- vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot,
- is_device_dma_coherent(dev));
-
- if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret))
- return ret;
-
if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) {
ret = remap_pfn_range(vma, vma->vm_start,
pfn + off,
return ret;
}
-static int __swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt,
- void *cpu_addr, dma_addr_t handle, size_t size,
- unsigned long attrs)
+static int __swiotlb_mmap(struct device *dev,
+ struct vm_area_struct *vma,
+ void *cpu_addr, dma_addr_t dma_addr, size_t size,
+ unsigned long attrs)
+{
+ int ret;
+ unsigned long pfn = dma_to_phys(dev, dma_addr) >> PAGE_SHIFT;
+
+ vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot,
+ is_device_dma_coherent(dev));
+
+ if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret))
+ return ret;
+
+ return __swiotlb_mmap_pfn(vma, pfn, size);
+}
+
+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, phys_to_page(dma_to_phys(dev, handle)),
- PAGE_ALIGN(size), 0);
+ sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0);
return ret;
}
+static int __swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt,
+ void *cpu_addr, dma_addr_t handle, size_t size,
+ unsigned long attrs)
+{
+ struct page *page = phys_to_page(dma_to_phys(dev, handle));
+
+ return __swiotlb_get_sgtable_page(sgt, page, size);
+}
+
static int __swiotlb_dma_supported(struct device *hwdev, u64 mask)
{
if (swiotlb)
*/
gfp |= __GFP_ZERO;
- if (gfpflags_allow_blocking(gfp)) {
- struct page **pages;
- pgprot_t prot = __get_dma_pgprot(attrs, PAGE_KERNEL, coherent);
-
- pages = iommu_dma_alloc(dev, iosize, gfp, attrs, ioprot,
- handle, flush_page);
- if (!pages)
- return NULL;
-
- addr = dma_common_pages_remap(pages, size, VM_USERMAP, prot,
- __builtin_return_address(0));
- if (!addr)
- iommu_dma_free(dev, pages, iosize, handle);
- } else {
+ if (!gfpflags_allow_blocking(gfp)) {
struct page *page;
/*
* In atomic context we can't remap anything, so we'll only
__free_from_pool(addr, size);
addr = NULL;
}
+ } else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
+ pgprot_t prot = __get_dma_pgprot(attrs, PAGE_KERNEL, coherent);
+ struct page *page;
+
+ page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT,
+ get_order(size), gfp);
+ if (!page)
+ return NULL;
+
+ *handle = iommu_dma_map_page(dev, page, 0, iosize, ioprot);
+ if (iommu_dma_mapping_error(dev, *handle)) {
+ dma_release_from_contiguous(dev, page,
+ size >> PAGE_SHIFT);
+ return NULL;
+ }
+ if (!coherent)
+ __dma_flush_area(page_to_virt(page), iosize);
+
+ addr = dma_common_contiguous_remap(page, size, VM_USERMAP,
+ prot,
+ __builtin_return_address(0));
+ if (!addr) {
+ iommu_dma_unmap_page(dev, *handle, iosize, 0, attrs);
+ dma_release_from_contiguous(dev, page,
+ size >> PAGE_SHIFT);
+ }
+ } else {
+ pgprot_t prot = __get_dma_pgprot(attrs, PAGE_KERNEL, coherent);
+ struct page **pages;
+
+ pages = iommu_dma_alloc(dev, iosize, gfp, attrs, ioprot,
+ handle, flush_page);
+ if (!pages)
+ return NULL;
+
+ addr = dma_common_pages_remap(pages, size, VM_USERMAP, prot,
+ __builtin_return_address(0));
+ if (!addr)
+ iommu_dma_free(dev, pages, iosize, handle);
}
return addr;
}
size = PAGE_ALIGN(size);
/*
- * @cpu_addr will be one of 3 things depending on how it was allocated:
+ * @cpu_addr will be one of 4 things depending on how it was allocated:
+ * - A remapped array of pages for contiguous allocations.
* - A remapped array of pages from iommu_dma_alloc(), for all
* non-atomic allocations.
* - A non-cacheable alias from the atomic pool, for atomic
if (__in_atomic_pool(cpu_addr, size)) {
iommu_dma_unmap_page(dev, handle, iosize, 0, 0);
__free_from_pool(cpu_addr, size);
+ } else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) {
+ struct page *page = vmalloc_to_page(cpu_addr);
+
+ iommu_dma_unmap_page(dev, handle, iosize, 0, attrs);
+ 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);
if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret))
return ret;
+ 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 __swiotlb_mmap_pfn(vma, pfn, size);
+ }
+
area = find_vm_area(cpu_addr);
if (WARN_ON(!area || !area->pages))
return -ENXIO;
unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
struct vm_struct *area = find_vm_area(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 __swiotlb_get_sgtable_page(sgt, page, size);
+ }
+
if (WARN_ON(!area || !area->pages))
return -ENXIO;
dev->archdata.dma_coherent = coherent;
__iommu_setup_dma_ops(dev, dma_base, size, iommu);
+
+#ifdef CONFIG_XEN
+ if (xen_initial_domain()) {
+ dev->archdata.dev_dma_ops = dev->dma_ops;
+ dev->dma_ops = xen_dma_ops;
+ }
+#endif
}
projects / karo-tx-linux.git / blobdiff