3  *  linux/arch/arm/mm/dma-mapping.c
7  *  DMA uncached mapping support.
420 		 * Clear previous low-memory mapping to ensure that the  in dma_contiguous_remap()
783  * Create userspace mapping for the DMA-coherent memory.
801  * Free a buffer as defined by the above mapping.
910  * Use the driver DMA support - see dma-mapping.h (dma_sync_*)
1101 static int extend_iommu_mapping(struct dma_iommu_mapping *mapping);
1103 static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping,  in __alloc_iova()  argument
1109 	size_t mapping_size = mapping->bits << PAGE_SHIFT;  in __alloc_iova()
1120 	spin_lock_irqsave(&mapping->lock, flags);  in __alloc_iova()
1121 	for (i = 0; i < mapping->nr_bitmaps; i++) {  in __alloc_iova()
1122 		start = bitmap_find_next_zero_area(mapping->bitmaps[i],  in __alloc_iova()
1123 				mapping->bits, 0, count, align);  in __alloc_iova()
1125 		if (start > mapping->bits)  in __alloc_iova()
1128 		bitmap_set(mapping->bitmaps[i], start, count);  in __alloc_iova()
1133 	 * No unused range found. Try to extend the existing mapping  in __alloc_iova()
1137 	if (i == mapping->nr_bitmaps) {  in __alloc_iova()
1138 		if (extend_iommu_mapping(mapping)) {  in __alloc_iova()
1139 			spin_unlock_irqrestore(&mapping->lock, flags);  in __alloc_iova()
1143 		start = bitmap_find_next_zero_area(mapping->bitmaps[i],  in __alloc_iova()
1144 				mapping->bits, 0, count, align);  in __alloc_iova()
1146 		if (start > mapping->bits) {  in __alloc_iova()
1147 			spin_unlock_irqrestore(&mapping->lock, flags);  in __alloc_iova()
1151 		bitmap_set(mapping->bitmaps[i], start, count);  in __alloc_iova()
1153 	spin_unlock_irqrestore(&mapping->lock, flags);  in __alloc_iova()
1155 	iova = mapping->base + (mapping_size * i);  in __alloc_iova()
1161 static inline void __free_iova(struct dma_iommu_mapping *mapping,  in __free_iova()  argument
1165 	size_t mapping_size = mapping->bits << PAGE_SHIFT;  in __free_iova()
1173 	bitmap_index = (u32) (addr - mapping->base) / (u32) mapping_size;  in __free_iova()
1174 	BUG_ON(addr < mapping->base || bitmap_index > mapping->extensions);  in __free_iova()
1176 	bitmap_base = mapping->base + mapping_size * bitmap_index;  in __free_iova()
1191 	spin_lock_irqsave(&mapping->lock, flags);  in __free_iova()
1192 	bitmap_clear(mapping->bitmaps[bitmap_index], start, count);  in __free_iova()
1193 	spin_unlock_irqrestore(&mapping->lock, flags);  in __free_iova()
1309  * Create a mapping in device IO address space for specified pages
1315 	struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);  in __iommu_create_mapping()  local
1320 	dma_addr = __alloc_iova(mapping, size);  in __iommu_create_mapping()
1337 		ret = iommu_map(mapping->domain, iova, phys, len,  in __iommu_create_mapping()
1346 	iommu_unmap(mapping->domain, dma_addr, iova-dma_addr);  in __iommu_create_mapping()
1347 	__free_iova(mapping, dma_addr, size);  in __iommu_create_mapping()
1353 	struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);  in __iommu_remove_mapping()  local
1362 	iommu_unmap(mapping->domain, iova, size);  in __iommu_remove_mapping()
1363 	__free_iova(mapping, iova, size);  in __iommu_remove_mapping()
1522  * free a page as defined by the above mapping.
1584 	struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);  in __map_sg_chunk()  local
1594 	iova_base = iova = __alloc_iova(mapping, size);  in __map_sg_chunk()
1607 		ret = iommu_map(mapping->domain, iova, phys, len, prot);  in __map_sg_chunk()
1617 	iommu_unmap(mapping->domain, iova_base, count * PAGE_SIZE);  in __map_sg_chunk()
1618 	__free_iova(mapping, iova_base, size);  in __map_sg_chunk()
1812 	struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);  in arm_coherent_iommu_map_page()  local
1816 	dma_addr = __alloc_iova(mapping, len);  in arm_coherent_iommu_map_page()
1822 	ret = iommu_map(mapping->domain, dma_addr, page_to_phys(page), len, prot);  in arm_coherent_iommu_map_page()
1828 	__free_iova(mapping, dma_addr, len);  in arm_coherent_iommu_map_page()
1864 	struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);  in arm_coherent_iommu_unmap_page()  local
1872 	iommu_unmap(mapping->domain, iova, len);  in arm_coherent_iommu_unmap_page()
1873 	__free_iova(mapping, iova, len);  in arm_coherent_iommu_unmap_page()
1888 	struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);  in arm_iommu_unmap_page()  local
1890 	struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));  in arm_iommu_unmap_page()
1900 	iommu_unmap(mapping->domain, iova, len);  in arm_iommu_unmap_page()
1901 	__free_iova(mapping, iova, len);  in arm_iommu_unmap_page()
1915 	struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);  in arm_iommu_map_resource()  local
1922 	dma_addr = __alloc_iova(mapping, len);  in arm_iommu_map_resource()
1928 	ret = iommu_map(mapping->domain, dma_addr, addr, len, prot);  in arm_iommu_map_resource()
1934 	__free_iova(mapping, dma_addr, len);  in arm_iommu_map_resource()
1949 	struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);  in arm_iommu_unmap_resource()  local
1957 	iommu_unmap(mapping->domain, iova, len);  in arm_iommu_unmap_resource()
1958 	__free_iova(mapping, iova, len);  in arm_iommu_unmap_resource()
1964 	struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);  in arm_iommu_sync_single_for_cpu()  local
1966 	struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));  in arm_iommu_sync_single_for_cpu()
1978 	struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);  in arm_iommu_sync_single_for_device()  local
1980 	struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova));  in arm_iommu_sync_single_for_device()
2035  * Creates a mapping structure which holds information about used/unused
2037  * mapping with IOMMU aware functions.
2039  * The client device need to be attached to the mapping with
2047 	struct dma_iommu_mapping *mapping;  in arm_iommu_create_mapping()  local
2063 	mapping = kzalloc(sizeof(struct dma_iommu_mapping), GFP_KERNEL);  in arm_iommu_create_mapping()
2064 	if (!mapping)  in arm_iommu_create_mapping()
2067 	mapping->bitmap_size = bitmap_size;  in arm_iommu_create_mapping()
2068 	mapping->bitmaps = kcalloc(extensions, sizeof(unsigned long *),  in arm_iommu_create_mapping()
2070 	if (!mapping->bitmaps)  in arm_iommu_create_mapping()
2073 	mapping->bitmaps[0] = kzalloc(bitmap_size, GFP_KERNEL);  in arm_iommu_create_mapping()
2074 	if (!mapping->bitmaps[0])  in arm_iommu_create_mapping()
2077 	mapping->nr_bitmaps = 1;  in arm_iommu_create_mapping()
2078 	mapping->extensions = extensions;  in arm_iommu_create_mapping()
2079 	mapping->base = base;  in arm_iommu_create_mapping()
2080 	mapping->bits = BITS_PER_BYTE * bitmap_size;  in arm_iommu_create_mapping()
2082 	spin_lock_init(&mapping->lock);  in arm_iommu_create_mapping()
2084 	mapping->domain = iommu_domain_alloc(bus);  in arm_iommu_create_mapping()
2085 	if (!mapping->domain)  in arm_iommu_create_mapping()
2088 	kref_init(&mapping->kref);  in arm_iommu_create_mapping()
2089 	return mapping;  in arm_iommu_create_mapping()
2091 	kfree(mapping->bitmaps[0]);  in arm_iommu_create_mapping()
2093 	kfree(mapping->bitmaps);  in arm_iommu_create_mapping()
2095 	kfree(mapping);  in arm_iommu_create_mapping()
2104 	struct dma_iommu_mapping *mapping =  in release_iommu_mapping()  local
2107 	iommu_domain_free(mapping->domain);  in release_iommu_mapping()
2108 	for (i = 0; i < mapping->nr_bitmaps; i++)  in release_iommu_mapping()
2109 		kfree(mapping->bitmaps[i]);  in release_iommu_mapping()
2110 	kfree(mapping->bitmaps);  in release_iommu_mapping()
2111 	kfree(mapping);  in release_iommu_mapping()
2114 static int extend_iommu_mapping(struct dma_iommu_mapping *mapping)  in extend_iommu_mapping()  argument
2118 	if (mapping->nr_bitmaps >= mapping->extensions)  in extend_iommu_mapping()
2121 	next_bitmap = mapping->nr_bitmaps;  in extend_iommu_mapping()
2122 	mapping->bitmaps[next_bitmap] = kzalloc(mapping->bitmap_size,  in extend_iommu_mapping()
2124 	if (!mapping->bitmaps[next_bitmap])  in extend_iommu_mapping()
2127 	mapping->nr_bitmaps++;  in extend_iommu_mapping()
2132 void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping)  in arm_iommu_release_mapping()  argument
2134 	if (mapping)  in arm_iommu_release_mapping()
2135 		kref_put(&mapping->kref, release_iommu_mapping);  in arm_iommu_release_mapping()
2140 				     struct dma_iommu_mapping *mapping)  in __arm_iommu_attach_device()  argument
2144 	err = iommu_attach_device(mapping->domain, dev);  in __arm_iommu_attach_device()
2148 	kref_get(&mapping->kref);  in __arm_iommu_attach_device()
2149 	to_dma_iommu_mapping(dev) = mapping;  in __arm_iommu_attach_device()
2158  * @mapping: io address space mapping structure (returned from
2161  * Attaches specified io address space mapping to the provided device.
2166  * mapping.
2169 			    struct dma_iommu_mapping *mapping)  in arm_iommu_attach_device()  argument
2173 	err = __arm_iommu_attach_device(dev, mapping);  in arm_iommu_attach_device()
2191 	struct dma_iommu_mapping *mapping;  in arm_iommu_detach_device()  local
2193 	mapping = to_dma_iommu_mapping(dev);  in arm_iommu_detach_device()
2194 	if (!mapping) {  in arm_iommu_detach_device()
2199 	iommu_detach_device(mapping->domain, dev);  in arm_iommu_detach_device()
2200 	kref_put(&mapping->kref, release_iommu_mapping);  in arm_iommu_detach_device()
2216 	struct dma_iommu_mapping *mapping;  in arm_setup_iommu_dma_ops()  local
2221 	mapping = arm_iommu_create_mapping(dev->bus, dma_base, size);  in arm_setup_iommu_dma_ops()
2222 	if (IS_ERR(mapping)) {  in arm_setup_iommu_dma_ops()
2223 		pr_warn("Failed to create %llu-byte IOMMU mapping for device %s\n",  in arm_setup_iommu_dma_ops()
2228 	if (__arm_iommu_attach_device(dev, mapping)) {  in arm_setup_iommu_dma_ops()
2231 		arm_iommu_release_mapping(mapping);  in arm_setup_iommu_dma_ops()
2240 	struct dma_iommu_mapping *mapping = to_dma_iommu_mapping(dev);  in arm_teardown_iommu_dma_ops()  local
2242 	if (!mapping)  in arm_teardown_iommu_dma_ops()
2246 	arm_iommu_release_mapping(mapping);  in arm_teardown_iommu_dma_ops()