diff options
Diffstat (limited to 'arch/arm64/mm/dma-mapping.c')
| -rw-r--r-- | arch/arm64/mm/dma-mapping.c | 288 |
1 files changed, 14 insertions, 274 deletions
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c index a3ac26284845..fb0908456a1f 100644 --- a/arch/arm64/mm/dma-mapping.c +++ b/arch/arm64/mm/dma-mapping.c @@ -33,113 +33,6 @@ #include <asm/cacheflush.h> -static struct gen_pool *atomic_pool __ro_after_init; - -#define DEFAULT_DMA_COHERENT_POOL_SIZE SZ_256K -static size_t atomic_pool_size __initdata = DEFAULT_DMA_COHERENT_POOL_SIZE; - -static int __init early_coherent_pool(char *p) -{ - atomic_pool_size = memparse(p, &p); - return 0; -} -early_param("coherent_pool", early_coherent_pool); - -static void *__alloc_from_pool(size_t size, struct page **ret_page, gfp_t flags) -{ - unsigned long val; - void *ptr = NULL; - - if (!atomic_pool) { - WARN(1, "coherent pool not initialised!\n"); - return NULL; - } - - val = gen_pool_alloc(atomic_pool, size); - if (val) { - phys_addr_t phys = gen_pool_virt_to_phys(atomic_pool, val); - - *ret_page = phys_to_page(phys); - ptr = (void *)val; - memset(ptr, 0, size); - } - - return ptr; -} - -static bool __in_atomic_pool(void *start, size_t size) -{ - return addr_in_gen_pool(atomic_pool, (unsigned long)start, size); -} - -static int __free_from_pool(void *start, size_t size) -{ - if (!__in_atomic_pool(start, size)) - return 0; - - gen_pool_free(atomic_pool, (unsigned long)start, size); - - return 1; -} - -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; - pgprot_t prot = pgprot_writecombine(PAGE_KERNEL); - - size = PAGE_ALIGN(size); - - if (!gfpflags_allow_blocking(flags)) { - struct page *page = NULL; - void *addr = __alloc_from_pool(size, &page, flags); - - if (addr) - *dma_handle = phys_to_dma(dev, page_to_phys(page)); - - return addr; - } - - ptr = dma_direct_alloc_pages(dev, size, dma_handle, flags, attrs); - if (!ptr) - goto no_mem; - - /* remove any dirty cache lines on the kernel alias */ - __dma_flush_area(ptr, size); - - /* create a coherent mapping */ - page = virt_to_page(ptr); - coherent_ptr = dma_common_contiguous_remap(page, size, VM_USERMAP, - prot, __builtin_return_address(0)); - if (!coherent_ptr) - goto no_map; - - return coherent_ptr; - -no_map: - dma_direct_free_pages(dev, size, ptr, *dma_handle, attrs); -no_mem: - return NULL; -} - -void arch_dma_free(struct device *dev, size_t size, void *vaddr, - dma_addr_t dma_handle, unsigned long attrs) -{ - if (!__free_from_pool(vaddr, PAGE_ALIGN(size))) { - void *kaddr = phys_to_virt(dma_to_phys(dev, dma_handle)); - - vunmap(vaddr); - dma_direct_free_pages(dev, size, kaddr, dma_handle, attrs); - } -} - -long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr, - dma_addr_t dma_addr) -{ - return __phys_to_pfn(dma_to_phys(dev, dma_addr)); -} - pgprot_t arch_dma_mmap_pgprot(struct device *dev, pgprot_t prot, unsigned long attrs) { @@ -160,6 +53,11 @@ void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr, __dma_unmap_area(phys_to_virt(paddr), size, dir); } +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) @@ -191,167 +89,13 @@ static int __swiotlb_mmap_pfn(struct vm_area_struct *vma, } #endif /* CONFIG_IOMMU_DMA */ -static int __init atomic_pool_init(void) -{ - pgprot_t prot = __pgprot(PROT_NORMAL_NC); - unsigned long nr_pages = atomic_pool_size >> PAGE_SHIFT; - struct page *page; - void *addr; - unsigned int pool_size_order = get_order(atomic_pool_size); - - if (dev_get_cma_area(NULL)) - page = dma_alloc_from_contiguous(NULL, nr_pages, - pool_size_order, false); - else - page = alloc_pages(GFP_DMA32, pool_size_order); - - if (page) { - int ret; - void *page_addr = page_address(page); - - memset(page_addr, 0, atomic_pool_size); - __dma_flush_area(page_addr, atomic_pool_size); - - atomic_pool = gen_pool_create(PAGE_SHIFT, -1); - if (!atomic_pool) - goto free_page; - - addr = dma_common_contiguous_remap(page, atomic_pool_size, - VM_USERMAP, prot, atomic_pool_init); - - if (!addr) - goto destroy_genpool; - - ret = gen_pool_add_virt(atomic_pool, (unsigned long)addr, - page_to_phys(page), - atomic_pool_size, -1); - if (ret) - goto remove_mapping; - - gen_pool_set_algo(atomic_pool, - gen_pool_first_fit_order_align, - NULL); - - pr_info("DMA: preallocated %zu KiB pool for atomic allocations\n", - atomic_pool_size / 1024); - return 0; - } - goto out; - -remove_mapping: - dma_common_free_remap(addr, atomic_pool_size, VM_USERMAP); -destroy_genpool: - gen_pool_destroy(atomic_pool); - atomic_pool = NULL; -free_page: - if (!dma_release_from_contiguous(NULL, page, nr_pages)) - __free_pages(page, pool_size_order); -out: - pr_err("DMA: failed to allocate %zu KiB pool for atomic coherent allocation\n", - atomic_pool_size / 1024); - return -ENOMEM; -} - -/******************************************** - * The following APIs are for dummy DMA ops * - ********************************************/ - -static void *__dummy_alloc(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flags, - unsigned long attrs) -{ - return NULL; -} - -static void __dummy_free(struct device *dev, size_t size, - void *vaddr, dma_addr_t dma_handle, - 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, - unsigned long attrs) -{ - return -ENXIO; -} - -static dma_addr_t __dummy_map_page(struct device *dev, struct page *page, - unsigned long offset, size_t size, - enum dma_data_direction dir, - unsigned long attrs) -{ - return 0; -} - -static void __dummy_unmap_page(struct device *dev, dma_addr_t dev_addr, - size_t size, enum dma_data_direction dir, - unsigned long attrs) -{ -} - -static int __dummy_map_sg(struct device *dev, struct scatterlist *sgl, - int nelems, enum dma_data_direction dir, - unsigned long attrs) -{ - return 0; -} - -static void __dummy_unmap_sg(struct device *dev, - struct scatterlist *sgl, int nelems, - enum dma_data_direction dir, - unsigned long attrs) -{ -} - -static void __dummy_sync_single(struct device *dev, - dma_addr_t dev_addr, size_t size, - enum dma_data_direction dir) -{ -} - -static void __dummy_sync_sg(struct device *dev, - struct scatterlist *sgl, int nelems, - enum dma_data_direction dir) -{ -} - -static int __dummy_mapping_error(struct device *hwdev, dma_addr_t dma_addr) -{ - return 1; -} - -static int __dummy_dma_supported(struct device *hwdev, u64 mask) -{ - return 0; -} - -const struct dma_map_ops dummy_dma_ops = { - .alloc = __dummy_alloc, - .free = __dummy_free, - .mmap = __dummy_mmap, - .map_page = __dummy_map_page, - .unmap_page = __dummy_unmap_page, - .map_sg = __dummy_map_sg, - .unmap_sg = __dummy_unmap_sg, - .sync_single_for_cpu = __dummy_sync_single, - .sync_single_for_device = __dummy_sync_single, - .sync_sg_for_cpu = __dummy_sync_sg, - .sync_sg_for_device = __dummy_sync_sg, - .mapping_error = __dummy_mapping_error, - .dma_supported = __dummy_dma_supported, -}; -EXPORT_SYMBOL(dummy_dma_ops); - static int __init arm64_dma_init(void) { WARN_TAINT(ARCH_DMA_MINALIGN < cache_line_size(), TAINT_CPU_OUT_OF_SPEC, "ARCH_DMA_MINALIGN smaller than CTR_EL0.CWG (%d < %d)", ARCH_DMA_MINALIGN, cache_line_size()); - - return atomic_pool_init(); + return dma_atomic_pool_init(GFP_DMA32, __pgprot(PROT_NORMAL_NC)); } arch_initcall(arm64_dma_init); @@ -397,17 +141,17 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size, page = alloc_pages(gfp, get_order(size)); addr = page ? page_address(page) : NULL; } else { - addr = __alloc_from_pool(size, &page, gfp); + addr = dma_alloc_from_pool(size, &page, gfp); } if (!addr) return NULL; *handle = iommu_dma_map_page(dev, page, 0, iosize, ioprot); - if (iommu_dma_mapping_error(dev, *handle)) { + if (*handle == DMA_MAPPING_ERROR) { if (coherent) __free_pages(page, get_order(size)); else - __free_from_pool(addr, size); + dma_free_from_pool(addr, size); addr = NULL; } } else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) { @@ -420,7 +164,7 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size, return NULL; *handle = iommu_dma_map_page(dev, page, 0, iosize, ioprot); - if (iommu_dma_mapping_error(dev, *handle)) { + if (*handle == DMA_MAPPING_ERROR) { dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT); return NULL; @@ -429,9 +173,9 @@ static void *__iommu_alloc_attrs(struct device *dev, size_t size, prot, __builtin_return_address(0)); if (addr) { - memset(addr, 0, size); if (!coherent) __dma_flush_area(page_to_virt(page), iosize); + memset(addr, 0, size); } else { iommu_dma_unmap_page(dev, *handle, iosize, 0, attrs); dma_release_from_contiguous(dev, page, @@ -471,9 +215,9 @@ static void __iommu_free_attrs(struct device *dev, size_t size, void *cpu_addr, * coherent devices. * Hence how dodgy the below logic looks... */ - if (__in_atomic_pool(cpu_addr, size)) { + if (dma_in_atomic_pool(cpu_addr, size)) { iommu_dma_unmap_page(dev, handle, iosize, 0, 0); - __free_from_pool(cpu_addr, size); + dma_free_from_pool(cpu_addr, size); } else if (attrs & DMA_ATTR_FORCE_CONTIGUOUS) { struct page *page = vmalloc_to_page(cpu_addr); @@ -580,7 +324,7 @@ static dma_addr_t __iommu_map_page(struct device *dev, struct page *page, dma_addr_t dev_addr = iommu_dma_map_page(dev, page, offset, size, prot); if (!coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC) && - !iommu_dma_mapping_error(dev, dev_addr)) + dev_addr != DMA_MAPPING_ERROR) __dma_map_area(page_address(page) + offset, size, dir); return dev_addr; @@ -663,7 +407,6 @@ static const struct dma_map_ops iommu_dma_ops = { .sync_sg_for_device = __iommu_sync_sg_for_device, .map_resource = iommu_dma_map_resource, .unmap_resource = iommu_dma_unmap_resource, - .mapping_error = iommu_dma_mapping_error, }; static int __init __iommu_dma_init(void) @@ -719,9 +462,6 @@ static void __iommu_setup_dma_ops(struct device *dev, u64 dma_base, u64 size, 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 = &swiotlb_dma_ops; - dev->dma_coherent = coherent; __iommu_setup_dma_ops(dev, dma_base, size, iommu); |