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author | Christoph Hellwig <hch@lst.de> | 2018-10-08 09:12:01 +0200 |
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committer | Christoph Hellwig <hch@lst.de> | 2018-10-19 08:53:24 +0200 |
commit | 886643b766321f15f63bd950be618cbb6dd22bbc (patch) | |
tree | d84cbe166a610723a06937fbb09c89ffcb608246 /arch/arm64/mm | |
parent | a4a4330db46a17289cf2ca5f9fb153d536267b97 (diff) | |
download | linux-886643b766321f15f63bd950be618cbb6dd22bbc.tar.gz linux-886643b766321f15f63bd950be618cbb6dd22bbc.tar.bz2 linux-886643b766321f15f63bd950be618cbb6dd22bbc.zip |
arm64: use the generic swiotlb_dma_ops
Now that the generic swiotlb code supports non-coherent DMA we can switch
to it for arm64. For that we need to refactor the existing
alloc/free/mmap/pgprot helpers to be used as the architecture hooks,
and implement the standard arch_sync_dma_for_{device,cpu} hooks for
cache maintaincance in the streaming dma hooks, which also implies
using the generic dma_coherent flag in struct device.
Note that we need to keep the old is_device_dma_coherent function around
for now, so that the shared arm/arm64 Xen code keeps working.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/mm')
-rw-r--r-- | arch/arm64/mm/dma-mapping.c | 253 |
1 files changed, 46 insertions, 207 deletions
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c index eee6cfcfde9e..5a5d7990e980 100644 --- a/arch/arm64/mm/dma-mapping.c +++ b/arch/arm64/mm/dma-mapping.c @@ -25,6 +25,7 @@ #include <linux/slab.h> #include <linux/genalloc.h> #include <linux/dma-direct.h> +#include <linux/dma-noncoherent.h> #include <linux/dma-contiguous.h> #include <linux/vmalloc.h> #include <linux/swiotlb.h> @@ -32,16 +33,6 @@ #include <asm/cacheflush.h> -static int swiotlb __ro_after_init; - -static pgprot_t __get_dma_pgprot(unsigned long attrs, pgprot_t prot, - bool coherent) -{ - if (!coherent || (attrs & DMA_ATTR_WRITE_COMBINE)) - return pgprot_writecombine(prot); - return prot; -} - static struct gen_pool *atomic_pool __ro_after_init; #define DEFAULT_DMA_COHERENT_POOL_SIZE SZ_256K @@ -91,18 +82,16 @@ static int __free_from_pool(void *start, size_t size) return 1; } -static void *__dma_alloc(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flags, - unsigned long attrs) +void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, + gfp_t flags, unsigned long attrs) { struct page *page; void *ptr, *coherent_ptr; - bool coherent = is_device_dma_coherent(dev); - pgprot_t prot = __get_dma_pgprot(attrs, PAGE_KERNEL, false); + pgprot_t prot = pgprot_writecombine(PAGE_KERNEL); size = PAGE_ALIGN(size); - if (!coherent && !gfpflags_allow_blocking(flags)) { + if (!gfpflags_allow_blocking(flags)) { struct page *page = NULL; void *addr = __alloc_from_pool(size, &page, flags); @@ -116,10 +105,6 @@ static void *__dma_alloc(struct device *dev, size_t size, if (!ptr) goto no_mem; - /* no need for non-cacheable mapping if coherent */ - if (coherent) - return ptr; - /* remove any dirty cache lines on the kernel alias */ __dma_flush_area(ptr, size); @@ -138,125 +123,52 @@ no_mem: return NULL; } -static void __dma_free(struct device *dev, size_t size, - void *vaddr, dma_addr_t dma_handle, - unsigned long attrs) +void arch_dma_free(struct device *dev, size_t size, void *vaddr, + dma_addr_t dma_handle, unsigned long attrs) { - void *swiotlb_addr = phys_to_virt(dma_to_phys(dev, dma_handle)); + if (!__free_from_pool(vaddr, PAGE_ALIGN(size))) { + void *kaddr = phys_to_virt(dma_to_phys(dev, dma_handle)); - size = PAGE_ALIGN(size); - - if (!is_device_dma_coherent(dev)) { - if (__free_from_pool(vaddr, size)) - return; vunmap(vaddr); + dma_direct_free_pages(dev, size, kaddr, dma_handle, attrs); } - dma_direct_free_pages(dev, size, swiotlb_addr, dma_handle, attrs); } -static dma_addr_t __swiotlb_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction dir, - unsigned long attrs) +long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr, + dma_addr_t dma_addr) { - dma_addr_t dev_addr; - - dev_addr = swiotlb_map_page(dev, page, offset, size, dir, attrs); - if (!is_device_dma_coherent(dev) && - (attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0) - __dma_map_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir); - - return dev_addr; + return __phys_to_pfn(dma_to_phys(dev, dma_addr)); } - -static void __swiotlb_unmap_page(struct device *dev, dma_addr_t dev_addr, - size_t size, enum dma_data_direction dir, - unsigned long attrs) +pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot, + unsigned long attrs) { - if (!is_device_dma_coherent(dev) && - (attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0) - __dma_unmap_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir); - swiotlb_unmap_page(dev, dev_addr, size, dir, attrs); -} - -static int __swiotlb_map_sg_attrs(struct device *dev, struct scatterlist *sgl, - int nelems, enum dma_data_direction dir, - unsigned long attrs) -{ - struct scatterlist *sg; - int i, ret; - - ret = swiotlb_map_sg_attrs(dev, sgl, nelems, dir, attrs); - if (!is_device_dma_coherent(dev) && - (attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0) - for_each_sg(sgl, sg, ret, i) - __dma_map_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)), - sg->length, dir); - - return ret; -} - -static void __swiotlb_unmap_sg_attrs(struct device *dev, - struct scatterlist *sgl, int nelems, - enum dma_data_direction dir, - unsigned long attrs) -{ - struct scatterlist *sg; - int i; - - if (!is_device_dma_coherent(dev) && - (attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0) - for_each_sg(sgl, sg, nelems, i) - __dma_unmap_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)), - sg->length, dir); - swiotlb_unmap_sg_attrs(dev, sgl, nelems, dir, attrs); + if (!dev_is_dma_coherent(dev) || (attrs & DMA_ATTR_WRITE_COMBINE)) + return pgprot_writecombine(prot); + return prot; } -static void __swiotlb_sync_single_for_cpu(struct device *dev, - dma_addr_t dev_addr, size_t size, - enum dma_data_direction dir) +void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr, + size_t size, enum dma_data_direction dir) { - if (!is_device_dma_coherent(dev)) - __dma_unmap_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir); - swiotlb_sync_single_for_cpu(dev, dev_addr, size, dir); + __dma_map_area(phys_to_virt(paddr), size, dir); } -static void __swiotlb_sync_single_for_device(struct device *dev, - dma_addr_t dev_addr, size_t size, - enum dma_data_direction dir) +void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr, + size_t size, enum dma_data_direction dir) { - swiotlb_sync_single_for_device(dev, dev_addr, size, dir); - if (!is_device_dma_coherent(dev)) - __dma_map_area(phys_to_virt(dma_to_phys(dev, dev_addr)), size, dir); + __dma_unmap_area(phys_to_virt(paddr), size, dir); } -static void __swiotlb_sync_sg_for_cpu(struct device *dev, - struct scatterlist *sgl, int nelems, - enum dma_data_direction dir) +static int __swiotlb_get_sgtable_page(struct sg_table *sgt, + struct page *page, size_t size) { - struct scatterlist *sg; - int i; - - if (!is_device_dma_coherent(dev)) - for_each_sg(sgl, sg, nelems, i) - __dma_unmap_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)), - sg->length, dir); - swiotlb_sync_sg_for_cpu(dev, sgl, nelems, dir); -} + int ret = sg_alloc_table(sgt, 1, GFP_KERNEL); -static void __swiotlb_sync_sg_for_device(struct device *dev, - struct scatterlist *sgl, int nelems, - enum dma_data_direction dir) -{ - struct scatterlist *sg; - int i; + if (!ret) + sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0); - swiotlb_sync_sg_for_device(dev, sgl, nelems, dir); - if (!is_device_dma_coherent(dev)) - for_each_sg(sgl, sg, nelems, i) - __dma_map_area(phys_to_virt(dma_to_phys(dev, sg->dma_address)), - sg->length, dir); + return ret; } static int __swiotlb_mmap_pfn(struct vm_area_struct *vma, @@ -277,74 +189,6 @@ static int __swiotlb_mmap_pfn(struct vm_area_struct *vma, return ret; } -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_dev_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, 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) - return swiotlb_dma_supported(hwdev, mask); - return 1; -} - -static int __swiotlb_dma_mapping_error(struct device *hwdev, dma_addr_t addr) -{ - if (swiotlb) - return dma_direct_mapping_error(hwdev, addr); - return 0; -} - -static const struct dma_map_ops arm64_swiotlb_dma_ops = { - .alloc = __dma_alloc, - .free = __dma_free, - .mmap = __swiotlb_mmap, - .get_sgtable = __swiotlb_get_sgtable, - .map_page = __swiotlb_map_page, - .unmap_page = __swiotlb_unmap_page, - .map_sg = __swiotlb_map_sg_attrs, - .unmap_sg = __swiotlb_unmap_sg_attrs, - .sync_single_for_cpu = __swiotlb_sync_single_for_cpu, - .sync_single_for_device = __swiotlb_sync_single_for_device, - .sync_sg_for_cpu = __swiotlb_sync_sg_for_cpu, - .sync_sg_for_device = __swiotlb_sync_sg_for_device, - .dma_supported = __swiotlb_dma_supported, - .mapping_error = __swiotlb_dma_mapping_error, -}; - static int __init atomic_pool_init(void) { pgprot_t prot = __pgprot(PROT_NORMAL_NC); @@ -500,10 +344,6 @@ EXPORT_SYMBOL(dummy_dma_ops); static int __init arm64_dma_init(void) { - if (swiotlb_force == SWIOTLB_FORCE || - max_pfn > (arm64_dma_phys_limit >> PAGE_SHIFT)) - swiotlb = 1; - WARN_TAINT(ARCH_DMA_MINALIGN < cache_line_size(), TAINT_CPU_OUT_OF_SPEC, "ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)", @@ -528,7 +368,7 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp, unsigned long attrs) { - bool coherent = is_device_dma_coherent(dev); + bool coherent = dev_is_dma_coherent(dev); int ioprot = dma_info_to_prot(DMA_BIDIRECTIONAL, coherent, attrs); size_t iosize = size; void *addr; @@ -569,7 +409,7 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size, addr = NULL; } } else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) { - pgprot_t prot = __get_dma_pgprot(attrs, PAGE_KERNEL, coherent); + pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs); struct page *page; page = dma_alloc_from_contiguous(dev, size >> PAGE_SHIFT, @@ -596,7 +436,7 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size, size >> PAGE_SHIFT); } } else { - pgprot_t prot = __get_dma_pgprot(attrs, PAGE_KERNEL, coherent); + pgprot_t prot = arch_dma_mmap_pgprot(dev, PAGE_KERNEL, attrs); struct page **pages; pages = iommu_dma_alloc(dev, iosize, gfp, attrs, ioprot, @@ -658,8 +498,7 @@ static int __iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma, struct vm_struct *area; int ret; - vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot, - is_device_dma_coherent(dev)); + vma->vm_page_prot = arch_dma_mmap_pgprot(dev, vma->vm_page_prot, attrs); if (dma_mmap_from_dev_coherent(dev, vma, cpu_addr, size, &ret)) return ret; @@ -709,11 +548,11 @@ static void __iommu_sync_single_for_cpu(struct device *dev, { phys_addr_t phys; - if (is_device_dma_coherent(dev)) + if (dev_is_dma_coherent(dev)) return; phys = iommu_iova_to_phys(iommu_get_domain_for_dev(dev), dev_addr); - __dma_unmap_area(phys_to_virt(phys), size, dir); + arch_sync_dma_for_cpu(dev, phys, size, dir); } static void __iommu_sync_single_for_device(struct device *dev, @@ -722,11 +561,11 @@ static void __iommu_sync_single_for_device(struct device *dev, { phys_addr_t phys; - if (is_device_dma_coherent(dev)) + if (dev_is_dma_coherent(dev)) return; phys = iommu_iova_to_phys(iommu_get_domain_for_dev(dev), dev_addr); - __dma_map_area(phys_to_virt(phys), size, dir); + arch_sync_dma_for_device(dev, phys, size, dir); } static dma_addr_t __iommu_map_page(struct device *dev, struct page *page, @@ -734,7 +573,7 @@ static dma_addr_t __iommu_map_page(struct device *dev, struct page *page, enum dma_data_direction dir, unsigned long attrs) { - bool coherent = is_device_dma_coherent(dev); + bool coherent = dev_is_dma_coherent(dev); int prot = dma_info_to_prot(dir, coherent, attrs); dma_addr_t dev_addr = iommu_dma_map_page(dev, page, offset, size, prot); @@ -762,11 +601,11 @@ static void __iommu_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg; int i; - if (is_device_dma_coherent(dev)) + if (dev_is_dma_coherent(dev)) return; for_each_sg(sgl, sg, nelems, i) - __dma_unmap_area(sg_virt(sg), sg->length, dir); + arch_sync_dma_for_cpu(dev, sg_phys(sg), sg->length, dir); } static void __iommu_sync_sg_for_device(struct device *dev, @@ -776,18 +615,18 @@ static void __iommu_sync_sg_for_device(struct device *dev, struct scatterlist *sg; int i; - if (is_device_dma_coherent(dev)) + if (dev_is_dma_coherent(dev)) return; for_each_sg(sgl, sg, nelems, i) - __dma_map_area(sg_virt(sg), sg->length, dir); + arch_sync_dma_for_device(dev, sg_phys(sg), sg->length, dir); } static int __iommu_map_sg_attrs(struct device *dev, struct scatterlist *sgl, int nelems, enum dma_data_direction dir, unsigned long attrs) { - bool coherent = is_device_dma_coherent(dev); + bool coherent = dev_is_dma_coherent(dev); if ((attrs & DMA_ATTR_SKIP_CPU_SYNC) == 0) __iommu_sync_sg_for_device(dev, sgl, nelems, dir); @@ -879,9 +718,9 @@ void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, const struct iommu_ops *iommu, bool coherent) { if (!dev->dma_ops) - dev->dma_ops = &arm64_swiotlb_dma_ops; + dev->dma_ops = &swiotlb_dma_ops; - dev->archdata.dma_coherent = coherent; + dev->dma_coherent = coherent; __iommu_setup_dma_ops(dev, dma_base, size, iommu); #ifdef CONFIG_XEN |