Re: [PATCH v4 05/44] arm64: dma-mapping: Use unsigned long for dma_attrs

Robin Murphy
2016-06-10T10:51:55Z

Hi Krzysztof,

On 10/06/16 11:11, Krzysztof Kozlowski wrote:
> Split out subsystem specific changes for easier reviews. This will be
> squashed with main commit.
>
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
> ---
> arch/arm64/mm/dma-mapping.c | 57 +++++++++++++++++++++++----------------------
> 1 file changed, 29 insertions(+), 28 deletions(-)
>
> diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
> index 0ef620a34c4e..a7686028dfeb 100644
> --- a/arch/arm64/mm/dma-mapping.c
> +++ b/arch/arm64/mm/dma-mapping.c
> @@ -29,7 +29,7 @@
>
> #include <asm/cacheflush.h>
>
> -static pgprot_t __get_dma_pgprot(const struct dma_attrs *attrs, pgprot_t prot,
> +static pgprot_t __get_dma_pgprot(unsigned long attrs, pgprot_t prot,
> bool coherent)

Is this series intended to replace the patches currently in -next adding
that "const"? (I was momentarily puzzled why this wouldn't apply locally)

> {
> if (!coherent || dma_get_attr(DMA_ATTR_WRITE_COMBINE, attrs))
> @@ -88,7 +88,7 @@ static int __free_from_pool(void *start, size_t size)
>
> static void *__dma_alloc_coherent(struct device *dev, size_t size,
> dma_addr_t *dma_handle, gfp_t flags,
> - const struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> if (dev == NULL) {
> WARN_ONCE(1, "Use an actual device structure for DMA allocation\n");
> @@ -118,7 +118,7 @@ static void *__dma_alloc_coherent(struct device *dev, size_t size,
>
> static void __dma_free_coherent(struct device *dev, size_t size,
> void *vaddr, dma_addr_t dma_handle,
> - const struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> bool freed;
> phys_addr_t paddr = dma_to_phys(dev, dma_handle);
> @@ -137,7 +137,7 @@ static void __dma_free_coherent(struct device *dev, size_t size,
>
> static void *__dma_alloc(struct device *dev, size_t size,
> dma_addr_t *dma_handle, gfp_t flags,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> struct page *page;
> void *ptr, *coherent_ptr;
> @@ -185,7 +185,7 @@ no_mem:
>
> static void __dma_free(struct device *dev, size_t size,
> void *vaddr, dma_addr_t dma_handle,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> void *swiotlb_addr = phys_to_virt(dma_to_phys(dev, dma_handle));
>
> @@ -202,7 +202,7 @@ static void __dma_free(struct device *dev, size_t size,
> static dma_addr_t __swiotlb_map_page(struct device *dev, struct page *page,
> unsigned long offset, size_t size,
> enum dma_data_direction dir,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> dma_addr_t dev_addr;
>
> @@ -216,7 +216,7 @@ static dma_addr_t __swiotlb_map_page(struct device *dev, struct page *page,
>
> static void __swiotlb_unmap_page(struct device *dev, dma_addr_t dev_addr,
> size_t size, enum dma_data_direction dir,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> if (!is_device_dma_coherent(dev))
> __dma_unmap_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir);
> @@ -225,7 +225,7 @@ static void __swiotlb_unmap_page(struct device *dev, dma_addr_t dev_addr,
>
> static int __swiotlb_map_sg_attrs(struct device *dev, struct scatterlist *sgl,
> int nelems, enum dma_data_direction dir,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> struct scatterlist *sg;
> int i, ret;
> @@ -242,7 +242,7 @@ static int __swiotlb_map_sg_attrs(struct device *dev, struct scatterlist *sgl,
> static void __swiotlb_unmap_sg_attrs(struct device *dev,
> struct scatterlist *sgl, int nelems,
> enum dma_data_direction dir,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> struct scatterlist *sg;
> int i;
> @@ -303,7 +303,7 @@ static void __swiotlb_sync_sg_for_device(struct device *dev,
> static int __swiotlb_mmap(struct device *dev,
> struct vm_area_struct *vma,
> void *cpu_addr, dma_addr_t dma_addr, size_t size,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> int ret = -ENXIO;
> unsigned long nr_vma_pages = (vma->vm_end - vma->vm_start) >>
> @@ -330,7 +330,7 @@ static int __swiotlb_mmap(struct device *dev,
>
> static int __swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt,
> void *cpu_addr, dma_addr_t handle, size_t size,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> int ret = sg_alloc_table(sgt, 1, GFP_KERNEL);
>
> @@ -425,21 +425,21 @@ out:
>
> static void *__dummy_alloc(struct device *dev, size_t size,
> dma_addr_t *dma_handle, gfp_t flags,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> return NULL;
> }
>
> static void __dummy_free(struct device *dev, size_t size,
> void *vaddr, dma_addr_t dma_handle,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> }
>
> static int __dummy_mmap(struct device *dev,
> struct vm_area_struct *vma,
> void *cpu_addr, dma_addr_t dma_addr, size_t size,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> return -ENXIO;
> }
> @@ -447,20 +447,20 @@ static int __dummy_mmap(struct device *dev,
> static dma_addr_t __dummy_map_page(struct device *dev, struct page *page,
> unsigned long offset, size_t size,
> enum dma_data_direction dir,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> return DMA_ERROR_CODE;
> }
>
> static void __dummy_unmap_page(struct device *dev, dma_addr_t dev_addr,
> size_t size, enum dma_data_direction dir,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> }
>
> static int __dummy_map_sg(struct device *dev, struct scatterlist *sgl,
> int nelems, enum dma_data_direction dir,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> return 0;
> }
> @@ -468,7 +468,7 @@ static int __dummy_map_sg(struct device *dev, struct scatterlist *sgl,
> static void __dummy_unmap_sg(struct device *dev,
> struct scatterlist *sgl, int nelems,
> enum dma_data_direction dir,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> }
>
> @@ -540,7 +540,7 @@ static void flush_page(struct device *dev, const void *virt, phys_addr_t phys)
>
> static void *__iommu_alloc_attrs(struct device *dev, size_t size,
> dma_addr_t *handle, gfp_t gfp,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> bool coherent = is_device_dma_coherent(dev);
> int ioprot = dma_direction_to_prot(DMA_BIDIRECTIONAL, coherent);
> @@ -600,7 +600,8 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size,
> }
>
> static void __iommu_free_attrs(struct device *dev, size_t size, void *cpu_addr,
> - dma_addr_t handle, struct dma_attrs *attrs)
> + dma_addr_t handle,
> + unsigned long attrs)

Nit: unnecessary line break?

Otherwise, though, I'm all for the idea;

Acked-by: Robin Murphy <robin.murphy@arm.com>

> {
> size_t iosize = size;
>
> @@ -616,7 +617,7 @@ static void __iommu_free_attrs(struct device *dev, size_t size, void *cpu_addr,
> * Hence how dodgy the below logic looks...
> */
> if (__in_atomic_pool(cpu_addr, size)) {
> - iommu_dma_unmap_page(dev, handle, iosize, 0, NULL);
> + iommu_dma_unmap_page(dev, handle, iosize, 0, 0);
> __free_from_pool(cpu_addr, size);
> } else if (is_vmalloc_addr(cpu_addr)){
> struct vm_struct *area = find_vm_area(cpu_addr);
> @@ -626,14 +627,14 @@ static void __iommu_free_attrs(struct device *dev, size_t size, void *cpu_addr,
> iommu_dma_free(dev, area->pages, iosize, &handle);
> dma_common_free_remap(cpu_addr, size, VM_USERMAP);
> } else {
> - iommu_dma_unmap_page(dev, handle, iosize, 0, NULL);
> + iommu_dma_unmap_page(dev, handle, iosize, 0, 0);
> __free_pages(virt_to_page(cpu_addr), get_order(size));
> }
> }
>
> static int __iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
> void *cpu_addr, dma_addr_t dma_addr, size_t size,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> struct vm_struct *area;
> int ret;
> @@ -653,7 +654,7 @@ static int __iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma,
>
> static int __iommu_get_sgtable(struct device *dev, struct sg_table *sgt,
> void *cpu_addr, dma_addr_t dma_addr,
> - size_t size, struct dma_attrs *attrs)
> + size_t size, unsigned long attrs)
> {
> unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT;
> struct vm_struct *area = find_vm_area(cpu_addr);
> @@ -694,7 +695,7 @@ static void __iommu_sync_single_for_device(struct device *dev,
> static dma_addr_t __iommu_map_page(struct device *dev, struct page *page,
> unsigned long offset, size_t size,
> enum dma_data_direction dir,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> bool coherent = is_device_dma_coherent(dev);
> int prot = dma_direction_to_prot(dir, coherent);
> @@ -709,7 +710,7 @@ static dma_addr_t __iommu_map_page(struct device *dev, struct page *page,
>
> static void __iommu_unmap_page(struct device *dev, dma_addr_t dev_addr,
> size_t size, enum dma_data_direction dir,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
> __iommu_sync_single_for_cpu(dev, dev_addr, size, dir);
> @@ -747,7 +748,7 @@ static void __iommu_sync_sg_for_device(struct device *dev,
>
> static int __iommu_map_sg_attrs(struct device *dev, struct scatterlist *sgl,
> int nelems, enum dma_data_direction dir,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> bool coherent = is_device_dma_coherent(dev);
>
> @@ -761,7 +762,7 @@ static int __iommu_map_sg_attrs(struct device *dev, struct scatterlist *sgl,
> static void __iommu_unmap_sg_attrs(struct device *dev,
> struct scatterlist *sgl, int nelems,
> enum dma_data_direction dir,
> - struct dma_attrs *attrs)
> + unsigned long attrs)
> {
> if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs))
> __iommu_sync_sg_for_cpu(dev, sgl, nelems, dir);
>