Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Russell King | 0ddbccd | 2008-09-25 15:59:19 +0100 | [diff] [blame] | 2 | * linux/arch/arm/mm/dma-mapping.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 2000-2004 Russell King |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * DMA uncached mapping support. |
| 11 | */ |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/mm.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 14 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/errno.h> |
| 16 | #include <linux/list.h> |
| 17 | #include <linux/init.h> |
| 18 | #include <linux/device.h> |
| 19 | #include <linux/dma-mapping.h> |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 20 | #include <linux/dma-contiguous.h> |
Nicolas Pitre | 39af22a | 2010-12-15 15:14:45 -0500 | [diff] [blame] | 21 | #include <linux/highmem.h> |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 22 | #include <linux/memblock.h> |
Jon Medhurst | 99d1717 | 2011-08-02 17:28:27 +0100 | [diff] [blame] | 23 | #include <linux/slab.h> |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 24 | #include <linux/iommu.h> |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 25 | #include <linux/io.h> |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 26 | #include <linux/vmalloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Lennert Buytenhek | 23759dc | 2006-04-02 00:07:39 +0100 | [diff] [blame] | 28 | #include <asm/memory.h> |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 29 | #include <asm/highmem.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <asm/cacheflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <asm/tlbflush.h> |
Kevin Hilman | 37134cd | 2006-01-12 16:12:21 +0000 | [diff] [blame] | 32 | #include <asm/sizes.h> |
Jon Medhurst | 99d1717 | 2011-08-02 17:28:27 +0100 | [diff] [blame] | 33 | #include <asm/mach/arch.h> |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 34 | #include <asm/dma-iommu.h> |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 35 | #include <asm/mach/map.h> |
| 36 | #include <asm/system_info.h> |
| 37 | #include <asm/dma-contiguous.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
Russell King | 022ae53 | 2011-07-08 21:26:59 +0100 | [diff] [blame] | 39 | #include "mm.h" |
| 40 | |
Marek Szyprowski | 15237e1 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 41 | /* |
| 42 | * The DMA API is built upon the notion of "buffer ownership". A buffer |
| 43 | * is either exclusively owned by the CPU (and therefore may be accessed |
| 44 | * by it) or exclusively owned by the DMA device. These helper functions |
| 45 | * represent the transitions between these two ownership states. |
| 46 | * |
| 47 | * Note, however, that on later ARMs, this notion does not work due to |
| 48 | * speculative prefetches. We model our approach on the assumption that |
| 49 | * the CPU does do speculative prefetches, which means we clean caches |
| 50 | * before transfers and delay cache invalidation until transfer completion. |
| 51 | * |
Marek Szyprowski | 15237e1 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 52 | */ |
Marek Szyprowski | 51fde349 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 53 | static void __dma_page_cpu_to_dev(struct page *, unsigned long, |
Marek Szyprowski | 15237e1 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 54 | size_t, enum dma_data_direction); |
Marek Szyprowski | 51fde349 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 55 | static void __dma_page_dev_to_cpu(struct page *, unsigned long, |
Marek Szyprowski | 15237e1 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 56 | size_t, enum dma_data_direction); |
| 57 | |
Marek Szyprowski | 2dc6a01 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 58 | /** |
| 59 | * arm_dma_map_page - map a portion of a page for streaming DMA |
| 60 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 61 | * @page: page that buffer resides in |
| 62 | * @offset: offset into page for start of buffer |
| 63 | * @size: size of buffer to map |
| 64 | * @dir: DMA transfer direction |
| 65 | * |
| 66 | * Ensure that any data held in the cache is appropriately discarded |
| 67 | * or written back. |
| 68 | * |
| 69 | * The device owns this memory once this call has completed. The CPU |
| 70 | * can regain ownership by calling dma_unmap_page(). |
| 71 | */ |
Marek Szyprowski | 51fde349 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 72 | static dma_addr_t arm_dma_map_page(struct device *dev, struct page *page, |
Marek Szyprowski | 2dc6a01 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 73 | unsigned long offset, size_t size, enum dma_data_direction dir, |
| 74 | struct dma_attrs *attrs) |
| 75 | { |
Marek Szyprowski | 51fde349 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 76 | if (!arch_is_coherent()) |
| 77 | __dma_page_cpu_to_dev(page, offset, size, dir); |
| 78 | return pfn_to_dma(dev, page_to_pfn(page)) + offset; |
Marek Szyprowski | 2dc6a01 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 79 | } |
| 80 | |
| 81 | /** |
| 82 | * arm_dma_unmap_page - unmap a buffer previously mapped through dma_map_page() |
| 83 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 84 | * @handle: DMA address of buffer |
| 85 | * @size: size of buffer (same as passed to dma_map_page) |
| 86 | * @dir: DMA transfer direction (same as passed to dma_map_page) |
| 87 | * |
| 88 | * Unmap a page streaming mode DMA translation. The handle and size |
| 89 | * must match what was provided in the previous dma_map_page() call. |
| 90 | * All other usages are undefined. |
| 91 | * |
| 92 | * After this call, reads by the CPU to the buffer are guaranteed to see |
| 93 | * whatever the device wrote there. |
| 94 | */ |
Marek Szyprowski | 51fde349 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 95 | static void arm_dma_unmap_page(struct device *dev, dma_addr_t handle, |
Marek Szyprowski | 2dc6a01 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 96 | size_t size, enum dma_data_direction dir, |
| 97 | struct dma_attrs *attrs) |
| 98 | { |
Marek Szyprowski | 51fde349 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 99 | if (!arch_is_coherent()) |
| 100 | __dma_page_dev_to_cpu(pfn_to_page(dma_to_pfn(dev, handle)), |
| 101 | handle & ~PAGE_MASK, size, dir); |
Marek Szyprowski | 2dc6a01 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 102 | } |
| 103 | |
Marek Szyprowski | 51fde349 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 104 | static void arm_dma_sync_single_for_cpu(struct device *dev, |
Marek Szyprowski | 2dc6a01 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 105 | dma_addr_t handle, size_t size, enum dma_data_direction dir) |
| 106 | { |
| 107 | unsigned int offset = handle & (PAGE_SIZE - 1); |
| 108 | struct page *page = pfn_to_page(dma_to_pfn(dev, handle-offset)); |
Marek Szyprowski | 51fde349 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 109 | if (!arch_is_coherent()) |
| 110 | __dma_page_dev_to_cpu(page, offset, size, dir); |
Marek Szyprowski | 2dc6a01 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 111 | } |
| 112 | |
Marek Szyprowski | 51fde349 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 113 | static void arm_dma_sync_single_for_device(struct device *dev, |
Marek Szyprowski | 2dc6a01 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 114 | dma_addr_t handle, size_t size, enum dma_data_direction dir) |
| 115 | { |
| 116 | unsigned int offset = handle & (PAGE_SIZE - 1); |
| 117 | struct page *page = pfn_to_page(dma_to_pfn(dev, handle-offset)); |
Marek Szyprowski | 51fde349 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 118 | if (!arch_is_coherent()) |
| 119 | __dma_page_cpu_to_dev(page, offset, size, dir); |
Marek Szyprowski | 2dc6a01 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 120 | } |
| 121 | |
| 122 | static int arm_dma_set_mask(struct device *dev, u64 dma_mask); |
| 123 | |
| 124 | struct dma_map_ops arm_dma_ops = { |
Marek Szyprowski | f99d603 | 2012-05-16 18:31:23 +0200 | [diff] [blame] | 125 | .alloc = arm_dma_alloc, |
| 126 | .free = arm_dma_free, |
| 127 | .mmap = arm_dma_mmap, |
Marek Szyprowski | 2dc6a01 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 128 | .map_page = arm_dma_map_page, |
| 129 | .unmap_page = arm_dma_unmap_page, |
| 130 | .map_sg = arm_dma_map_sg, |
| 131 | .unmap_sg = arm_dma_unmap_sg, |
| 132 | .sync_single_for_cpu = arm_dma_sync_single_for_cpu, |
| 133 | .sync_single_for_device = arm_dma_sync_single_for_device, |
| 134 | .sync_sg_for_cpu = arm_dma_sync_sg_for_cpu, |
| 135 | .sync_sg_for_device = arm_dma_sync_sg_for_device, |
| 136 | .set_dma_mask = arm_dma_set_mask, |
| 137 | }; |
| 138 | EXPORT_SYMBOL(arm_dma_ops); |
| 139 | |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 140 | static u64 get_coherent_dma_mask(struct device *dev) |
| 141 | { |
Russell King | 022ae53 | 2011-07-08 21:26:59 +0100 | [diff] [blame] | 142 | u64 mask = (u64)arm_dma_limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 144 | if (dev) { |
| 145 | mask = dev->coherent_dma_mask; |
| 146 | |
| 147 | /* |
| 148 | * Sanity check the DMA mask - it must be non-zero, and |
| 149 | * must be able to be satisfied by a DMA allocation. |
| 150 | */ |
| 151 | if (mask == 0) { |
| 152 | dev_warn(dev, "coherent DMA mask is unset\n"); |
| 153 | return 0; |
| 154 | } |
| 155 | |
Russell King | 022ae53 | 2011-07-08 21:26:59 +0100 | [diff] [blame] | 156 | if ((~mask) & (u64)arm_dma_limit) { |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 157 | dev_warn(dev, "coherent DMA mask %#llx is smaller " |
| 158 | "than system GFP_DMA mask %#llx\n", |
Russell King | 022ae53 | 2011-07-08 21:26:59 +0100 | [diff] [blame] | 159 | mask, (u64)arm_dma_limit); |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 160 | return 0; |
| 161 | } |
| 162 | } |
| 163 | |
| 164 | return mask; |
| 165 | } |
| 166 | |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 167 | static void __dma_clear_buffer(struct page *page, size_t size) |
| 168 | { |
| 169 | void *ptr; |
| 170 | /* |
| 171 | * Ensure that the allocated pages are zeroed, and that any data |
| 172 | * lurking in the kernel direct-mapped region is invalidated. |
| 173 | */ |
| 174 | ptr = page_address(page); |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 175 | if (ptr) { |
| 176 | memset(ptr, 0, size); |
| 177 | dmac_flush_range(ptr, ptr + size); |
| 178 | outer_flush_range(__pa(ptr), __pa(ptr) + size); |
| 179 | } |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 180 | } |
| 181 | |
Russell King | 7a9a32a | 2009-11-19 15:31:07 +0000 | [diff] [blame] | 182 | /* |
| 183 | * Allocate a DMA buffer for 'dev' of size 'size' using the |
| 184 | * specified gfp mask. Note that 'size' must be page aligned. |
| 185 | */ |
| 186 | static struct page *__dma_alloc_buffer(struct device *dev, size_t size, gfp_t gfp) |
| 187 | { |
| 188 | unsigned long order = get_order(size); |
| 189 | struct page *page, *p, *e; |
Russell King | 7a9a32a | 2009-11-19 15:31:07 +0000 | [diff] [blame] | 190 | |
| 191 | page = alloc_pages(gfp, order); |
| 192 | if (!page) |
| 193 | return NULL; |
| 194 | |
| 195 | /* |
| 196 | * Now split the huge page and free the excess pages |
| 197 | */ |
| 198 | split_page(page, order); |
| 199 | for (p = page + (size >> PAGE_SHIFT), e = page + (1 << order); p < e; p++) |
| 200 | __free_page(p); |
| 201 | |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 202 | __dma_clear_buffer(page, size); |
Russell King | 7a9a32a | 2009-11-19 15:31:07 +0000 | [diff] [blame] | 203 | |
| 204 | return page; |
| 205 | } |
| 206 | |
| 207 | /* |
| 208 | * Free a DMA buffer. 'size' must be page aligned. |
| 209 | */ |
| 210 | static void __dma_free_buffer(struct page *page, size_t size) |
| 211 | { |
| 212 | struct page *e = page + (size >> PAGE_SHIFT); |
| 213 | |
| 214 | while (page < e) { |
| 215 | __free_page(page); |
| 216 | page++; |
| 217 | } |
| 218 | } |
| 219 | |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 220 | #ifdef CONFIG_MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | #ifdef CONFIG_HUGETLB_PAGE |
| 222 | #error ARM Coherent DMA allocator does not (yet) support huge TLB |
| 223 | #endif |
| 224 | |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 225 | static void *__alloc_from_contiguous(struct device *dev, size_t size, |
| 226 | pgprot_t prot, struct page **ret_page); |
| 227 | |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 228 | static void *__alloc_remap_buffer(struct device *dev, size_t size, gfp_t gfp, |
| 229 | pgprot_t prot, struct page **ret_page, |
| 230 | const void *caller); |
| 231 | |
| 232 | static void * |
| 233 | __dma_alloc_remap(struct page *page, size_t size, gfp_t gfp, pgprot_t prot, |
| 234 | const void *caller) |
| 235 | { |
| 236 | struct vm_struct *area; |
| 237 | unsigned long addr; |
| 238 | |
| 239 | /* |
| 240 | * DMA allocation can be mapped to user space, so lets |
| 241 | * set VM_USERMAP flags too. |
| 242 | */ |
| 243 | area = get_vm_area_caller(size, VM_ARM_DMA_CONSISTENT | VM_USERMAP, |
| 244 | caller); |
| 245 | if (!area) |
| 246 | return NULL; |
| 247 | addr = (unsigned long)area->addr; |
| 248 | area->phys_addr = __pfn_to_phys(page_to_pfn(page)); |
| 249 | |
| 250 | if (ioremap_page_range(addr, addr + size, area->phys_addr, prot)) { |
| 251 | vunmap((void *)addr); |
| 252 | return NULL; |
| 253 | } |
| 254 | return (void *)addr; |
| 255 | } |
| 256 | |
| 257 | static void __dma_free_remap(void *cpu_addr, size_t size) |
| 258 | { |
| 259 | unsigned int flags = VM_ARM_DMA_CONSISTENT | VM_USERMAP; |
| 260 | struct vm_struct *area = find_vm_area(cpu_addr); |
| 261 | if (!area || (area->flags & flags) != flags) { |
| 262 | WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr); |
| 263 | return; |
| 264 | } |
| 265 | unmap_kernel_range((unsigned long)cpu_addr, size); |
| 266 | vunmap(cpu_addr); |
| 267 | } |
| 268 | |
| 269 | struct dma_pool { |
| 270 | size_t size; |
| 271 | spinlock_t lock; |
| 272 | unsigned long *bitmap; |
| 273 | unsigned long nr_pages; |
| 274 | void *vaddr; |
| 275 | struct page *page; |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 276 | }; |
| 277 | |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 278 | static struct dma_pool atomic_pool = { |
| 279 | .size = SZ_256K, |
| 280 | }; |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 281 | |
| 282 | static int __init early_coherent_pool(char *p) |
| 283 | { |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 284 | atomic_pool.size = memparse(p, &p); |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 285 | return 0; |
| 286 | } |
| 287 | early_param("coherent_pool", early_coherent_pool); |
| 288 | |
| 289 | /* |
| 290 | * Initialise the coherent pool for atomic allocations. |
| 291 | */ |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 292 | static int __init atomic_pool_init(void) |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 293 | { |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 294 | struct dma_pool *pool = &atomic_pool; |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 295 | pgprot_t prot = pgprot_dmacoherent(pgprot_kernel); |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 296 | unsigned long nr_pages = pool->size >> PAGE_SHIFT; |
| 297 | unsigned long *bitmap; |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 298 | struct page *page; |
| 299 | void *ptr; |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 300 | int bitmap_size = BITS_TO_LONGS(nr_pages) * sizeof(long); |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 301 | |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 302 | bitmap = kzalloc(bitmap_size, GFP_KERNEL); |
| 303 | if (!bitmap) |
| 304 | goto no_bitmap; |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 305 | |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 306 | if (IS_ENABLED(CONFIG_CMA)) |
| 307 | ptr = __alloc_from_contiguous(NULL, pool->size, prot, &page); |
| 308 | else |
| 309 | ptr = __alloc_remap_buffer(NULL, pool->size, GFP_KERNEL, prot, |
| 310 | &page, NULL); |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 311 | if (ptr) { |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 312 | spin_lock_init(&pool->lock); |
| 313 | pool->vaddr = ptr; |
| 314 | pool->page = page; |
| 315 | pool->bitmap = bitmap; |
| 316 | pool->nr_pages = nr_pages; |
| 317 | pr_info("DMA: preallocated %u KiB pool for atomic coherent allocations\n", |
| 318 | (unsigned)pool->size / 1024); |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 319 | return 0; |
| 320 | } |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 321 | kfree(bitmap); |
| 322 | no_bitmap: |
| 323 | pr_err("DMA: failed to allocate %u KiB pool for atomic coherent allocation\n", |
| 324 | (unsigned)pool->size / 1024); |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 325 | return -ENOMEM; |
| 326 | } |
| 327 | /* |
| 328 | * CMA is activated by core_initcall, so we must be called after it. |
| 329 | */ |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 330 | postcore_initcall(atomic_pool_init); |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 331 | |
| 332 | struct dma_contig_early_reserve { |
| 333 | phys_addr_t base; |
| 334 | unsigned long size; |
| 335 | }; |
| 336 | |
| 337 | static struct dma_contig_early_reserve dma_mmu_remap[MAX_CMA_AREAS] __initdata; |
| 338 | |
| 339 | static int dma_mmu_remap_num __initdata; |
| 340 | |
| 341 | void __init dma_contiguous_early_fixup(phys_addr_t base, unsigned long size) |
| 342 | { |
| 343 | dma_mmu_remap[dma_mmu_remap_num].base = base; |
| 344 | dma_mmu_remap[dma_mmu_remap_num].size = size; |
| 345 | dma_mmu_remap_num++; |
| 346 | } |
| 347 | |
| 348 | void __init dma_contiguous_remap(void) |
| 349 | { |
| 350 | int i; |
| 351 | for (i = 0; i < dma_mmu_remap_num; i++) { |
| 352 | phys_addr_t start = dma_mmu_remap[i].base; |
| 353 | phys_addr_t end = start + dma_mmu_remap[i].size; |
| 354 | struct map_desc map; |
| 355 | unsigned long addr; |
| 356 | |
| 357 | if (end > arm_lowmem_limit) |
| 358 | end = arm_lowmem_limit; |
| 359 | if (start >= end) |
| 360 | return; |
| 361 | |
| 362 | map.pfn = __phys_to_pfn(start); |
| 363 | map.virtual = __phys_to_virt(start); |
| 364 | map.length = end - start; |
| 365 | map.type = MT_MEMORY_DMA_READY; |
| 366 | |
| 367 | /* |
| 368 | * Clear previous low-memory mapping |
| 369 | */ |
| 370 | for (addr = __phys_to_virt(start); addr < __phys_to_virt(end); |
Vitaly Andrianov | 61f6c7a | 2012-05-14 13:49:56 -0400 | [diff] [blame] | 371 | addr += PMD_SIZE) |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 372 | pmd_clear(pmd_off_k(addr)); |
| 373 | |
| 374 | iotable_init(&map, 1); |
| 375 | } |
| 376 | } |
| 377 | |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 378 | static int __dma_update_pte(pte_t *pte, pgtable_t token, unsigned long addr, |
| 379 | void *data) |
| 380 | { |
| 381 | struct page *page = virt_to_page(addr); |
| 382 | pgprot_t prot = *(pgprot_t *)data; |
| 383 | |
| 384 | set_pte_ext(pte, mk_pte(page, prot), 0); |
| 385 | return 0; |
| 386 | } |
| 387 | |
| 388 | static void __dma_remap(struct page *page, size_t size, pgprot_t prot) |
| 389 | { |
| 390 | unsigned long start = (unsigned long) page_address(page); |
| 391 | unsigned end = start + size; |
| 392 | |
| 393 | apply_to_page_range(&init_mm, start, size, __dma_update_pte, &prot); |
| 394 | dsb(); |
| 395 | flush_tlb_kernel_range(start, end); |
| 396 | } |
| 397 | |
| 398 | static void *__alloc_remap_buffer(struct device *dev, size_t size, gfp_t gfp, |
| 399 | pgprot_t prot, struct page **ret_page, |
| 400 | const void *caller) |
| 401 | { |
| 402 | struct page *page; |
| 403 | void *ptr; |
| 404 | page = __dma_alloc_buffer(dev, size, gfp); |
| 405 | if (!page) |
| 406 | return NULL; |
| 407 | |
| 408 | ptr = __dma_alloc_remap(page, size, gfp, prot, caller); |
| 409 | if (!ptr) { |
| 410 | __dma_free_buffer(page, size); |
| 411 | return NULL; |
| 412 | } |
| 413 | |
| 414 | *ret_page = page; |
| 415 | return ptr; |
| 416 | } |
| 417 | |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 418 | static void *__alloc_from_pool(size_t size, struct page **ret_page) |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 419 | { |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 420 | struct dma_pool *pool = &atomic_pool; |
| 421 | unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; |
| 422 | unsigned int pageno; |
| 423 | unsigned long flags; |
| 424 | void *ptr = NULL; |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 425 | size_t align; |
| 426 | |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 427 | if (!pool->vaddr) { |
| 428 | WARN(1, "coherent pool not initialised!\n"); |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 429 | return NULL; |
| 430 | } |
| 431 | |
| 432 | /* |
| 433 | * Align the region allocation - allocations from pool are rather |
| 434 | * small, so align them to their order in pages, minimum is a page |
| 435 | * size. This helps reduce fragmentation of the DMA space. |
| 436 | */ |
| 437 | align = PAGE_SIZE << get_order(size); |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 438 | |
| 439 | spin_lock_irqsave(&pool->lock, flags); |
| 440 | pageno = bitmap_find_next_zero_area(pool->bitmap, pool->nr_pages, |
| 441 | 0, count, (1 << align) - 1); |
| 442 | if (pageno < pool->nr_pages) { |
| 443 | bitmap_set(pool->bitmap, pageno, count); |
| 444 | ptr = pool->vaddr + PAGE_SIZE * pageno; |
| 445 | *ret_page = pool->page + pageno; |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 446 | } |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 447 | spin_unlock_irqrestore(&pool->lock, flags); |
| 448 | |
| 449 | return ptr; |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 450 | } |
| 451 | |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 452 | static int __free_from_pool(void *start, size_t size) |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 453 | { |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 454 | struct dma_pool *pool = &atomic_pool; |
| 455 | unsigned long pageno, count; |
| 456 | unsigned long flags; |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 457 | |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 458 | if (start < pool->vaddr || start > pool->vaddr + pool->size) |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 459 | return 0; |
| 460 | |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 461 | if (start + size > pool->vaddr + pool->size) { |
| 462 | WARN(1, "freeing wrong coherent size from pool\n"); |
| 463 | return 0; |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 464 | } |
| 465 | |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 466 | pageno = (start - pool->vaddr) >> PAGE_SHIFT; |
| 467 | count = size >> PAGE_SHIFT; |
| 468 | |
| 469 | spin_lock_irqsave(&pool->lock, flags); |
| 470 | bitmap_clear(pool->bitmap, pageno, count); |
| 471 | spin_unlock_irqrestore(&pool->lock, flags); |
| 472 | |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 473 | return 1; |
| 474 | } |
| 475 | |
| 476 | static void *__alloc_from_contiguous(struct device *dev, size_t size, |
| 477 | pgprot_t prot, struct page **ret_page) |
| 478 | { |
| 479 | unsigned long order = get_order(size); |
| 480 | size_t count = size >> PAGE_SHIFT; |
| 481 | struct page *page; |
| 482 | |
| 483 | page = dma_alloc_from_contiguous(dev, count, order); |
| 484 | if (!page) |
| 485 | return NULL; |
| 486 | |
| 487 | __dma_clear_buffer(page, size); |
| 488 | __dma_remap(page, size, prot); |
| 489 | |
| 490 | *ret_page = page; |
| 491 | return page_address(page); |
| 492 | } |
| 493 | |
| 494 | static void __free_from_contiguous(struct device *dev, struct page *page, |
| 495 | size_t size) |
| 496 | { |
| 497 | __dma_remap(page, size, pgprot_kernel); |
| 498 | dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT); |
| 499 | } |
| 500 | |
Marek Szyprowski | f99d603 | 2012-05-16 18:31:23 +0200 | [diff] [blame] | 501 | static inline pgprot_t __get_dma_pgprot(struct dma_attrs *attrs, pgprot_t prot) |
| 502 | { |
| 503 | prot = dma_get_attr(DMA_ATTR_WRITE_COMBINE, attrs) ? |
| 504 | pgprot_writecombine(prot) : |
| 505 | pgprot_dmacoherent(prot); |
| 506 | return prot; |
| 507 | } |
| 508 | |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 509 | #define nommu() 0 |
| 510 | |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 511 | #else /* !CONFIG_MMU */ |
Russell King | 695ae0a | 2009-11-19 16:31:39 +0000 | [diff] [blame] | 512 | |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 513 | #define nommu() 1 |
| 514 | |
Marek Szyprowski | f99d603 | 2012-05-16 18:31:23 +0200 | [diff] [blame] | 515 | #define __get_dma_pgprot(attrs, prot) __pgprot(0) |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 516 | #define __alloc_remap_buffer(dev, size, gfp, prot, ret, c) NULL |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 517 | #define __alloc_from_pool(size, ret_page) NULL |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 518 | #define __alloc_from_contiguous(dev, size, prot, ret) NULL |
| 519 | #define __free_from_pool(cpu_addr, size) 0 |
| 520 | #define __free_from_contiguous(dev, page, size) do { } while (0) |
| 521 | #define __dma_free_remap(cpu_addr, size) do { } while (0) |
Russell King | 31ebf94 | 2009-11-19 21:12:17 +0000 | [diff] [blame] | 522 | |
| 523 | #endif /* CONFIG_MMU */ |
| 524 | |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 525 | static void *__alloc_simple_buffer(struct device *dev, size_t size, gfp_t gfp, |
| 526 | struct page **ret_page) |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 527 | { |
Russell King | 04da569 | 2009-11-19 15:54:45 +0000 | [diff] [blame] | 528 | struct page *page; |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 529 | page = __dma_alloc_buffer(dev, size, gfp); |
| 530 | if (!page) |
| 531 | return NULL; |
| 532 | |
| 533 | *ret_page = page; |
| 534 | return page_address(page); |
| 535 | } |
| 536 | |
| 537 | |
| 538 | |
| 539 | static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, |
| 540 | gfp_t gfp, pgprot_t prot, const void *caller) |
| 541 | { |
| 542 | u64 mask = get_coherent_dma_mask(dev); |
| 543 | struct page *page; |
Russell King | 31ebf94 | 2009-11-19 21:12:17 +0000 | [diff] [blame] | 544 | void *addr; |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 545 | |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 546 | #ifdef CONFIG_DMA_API_DEBUG |
| 547 | u64 limit = (mask + 1) & ~mask; |
| 548 | if (limit && size >= limit) { |
| 549 | dev_warn(dev, "coherent allocation too big (requested %#x mask %#llx)\n", |
| 550 | size, mask); |
| 551 | return NULL; |
| 552 | } |
| 553 | #endif |
| 554 | |
| 555 | if (!mask) |
| 556 | return NULL; |
| 557 | |
| 558 | if (mask < 0xffffffffULL) |
| 559 | gfp |= GFP_DMA; |
| 560 | |
Sumit Bhattacharya | ea2e705 | 2011-11-24 00:47:12 +0100 | [diff] [blame] | 561 | /* |
| 562 | * Following is a work-around (a.k.a. hack) to prevent pages |
| 563 | * with __GFP_COMP being passed to split_page() which cannot |
| 564 | * handle them. The real problem is that this flag probably |
| 565 | * should be 0 on ARM as it is not supported on this |
| 566 | * platform; see CONFIG_HUGETLBFS. |
| 567 | */ |
| 568 | gfp &= ~(__GFP_COMP); |
| 569 | |
Marek Szyprowski | 553ac78 | 2012-02-29 14:45:28 +0100 | [diff] [blame] | 570 | *handle = DMA_ERROR_CODE; |
Russell King | 04da569 | 2009-11-19 15:54:45 +0000 | [diff] [blame] | 571 | size = PAGE_ALIGN(size); |
| 572 | |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 573 | if (arch_is_coherent() || nommu()) |
| 574 | addr = __alloc_simple_buffer(dev, size, gfp, &page); |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 575 | else if (gfp & GFP_ATOMIC) |
| 576 | addr = __alloc_from_pool(size, &page); |
Marek Szyprowski | f1ae98d | 2012-05-30 10:48:29 +0200 | [diff] [blame] | 577 | else if (!IS_ENABLED(CONFIG_CMA)) |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 578 | addr = __alloc_remap_buffer(dev, size, gfp, prot, &page, caller); |
Russell King | 31ebf94 | 2009-11-19 21:12:17 +0000 | [diff] [blame] | 579 | else |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 580 | addr = __alloc_from_contiguous(dev, size, prot, &page); |
Russell King | 31ebf94 | 2009-11-19 21:12:17 +0000 | [diff] [blame] | 581 | |
| 582 | if (addr) |
Russell King | 9eedd96 | 2011-01-03 00:00:17 +0000 | [diff] [blame] | 583 | *handle = pfn_to_dma(dev, page_to_pfn(page)); |
Russell King | 31ebf94 | 2009-11-19 21:12:17 +0000 | [diff] [blame] | 584 | |
| 585 | return addr; |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 586 | } |
Russell King | 695ae0a | 2009-11-19 16:31:39 +0000 | [diff] [blame] | 587 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | /* |
| 589 | * Allocate DMA-coherent memory space and return both the kernel remapped |
| 590 | * virtual and bus address for that space. |
| 591 | */ |
Marek Szyprowski | f99d603 | 2012-05-16 18:31:23 +0200 | [diff] [blame] | 592 | void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, |
| 593 | gfp_t gfp, struct dma_attrs *attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | { |
Marek Szyprowski | f99d603 | 2012-05-16 18:31:23 +0200 | [diff] [blame] | 595 | pgprot_t prot = __get_dma_pgprot(attrs, pgprot_kernel); |
Dmitry Baryshkov | 1fe5326 | 2008-07-18 13:30:14 +0400 | [diff] [blame] | 596 | void *memory; |
| 597 | |
| 598 | if (dma_alloc_from_coherent(dev, size, handle, &memory)) |
| 599 | return memory; |
| 600 | |
Marek Szyprowski | f99d603 | 2012-05-16 18:31:23 +0200 | [diff] [blame] | 601 | return __dma_alloc(dev, size, handle, gfp, prot, |
Russell King | 45cd529 | 2012-01-12 23:08:07 +0000 | [diff] [blame] | 602 | __builtin_return_address(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | |
| 605 | /* |
Marek Szyprowski | f99d603 | 2012-05-16 18:31:23 +0200 | [diff] [blame] | 606 | * Create userspace mapping for the DMA-coherent memory. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | */ |
Marek Szyprowski | f99d603 | 2012-05-16 18:31:23 +0200 | [diff] [blame] | 608 | int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma, |
| 609 | void *cpu_addr, dma_addr_t dma_addr, size_t size, |
| 610 | struct dma_attrs *attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | { |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 612 | int ret = -ENXIO; |
| 613 | #ifdef CONFIG_MMU |
Marek Szyprowski | 50262a4 | 2012-07-30 09:35:26 +0200 | [diff] [blame] | 614 | unsigned long nr_vma_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; |
| 615 | unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT; |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 616 | unsigned long pfn = dma_to_pfn(dev, dma_addr); |
Marek Szyprowski | 50262a4 | 2012-07-30 09:35:26 +0200 | [diff] [blame] | 617 | unsigned long off = vma->vm_pgoff; |
| 618 | |
Marek Szyprowski | f99d603 | 2012-05-16 18:31:23 +0200 | [diff] [blame] | 619 | vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot); |
| 620 | |
Marek Szyprowski | 47142f0 | 2012-05-15 19:04:13 +0200 | [diff] [blame] | 621 | if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret)) |
| 622 | return ret; |
| 623 | |
Marek Szyprowski | 50262a4 | 2012-07-30 09:35:26 +0200 | [diff] [blame] | 624 | if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) { |
| 625 | ret = remap_pfn_range(vma, vma->vm_start, |
| 626 | pfn + off, |
| 627 | vma->vm_end - vma->vm_start, |
| 628 | vma->vm_page_prot); |
| 629 | } |
Catalin Marinas | ab6494f | 2009-07-24 12:35:02 +0100 | [diff] [blame] | 630 | #endif /* CONFIG_MMU */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | |
| 632 | return ret; |
| 633 | } |
| 634 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | /* |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 636 | * Free a buffer as defined by the above mapping. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | */ |
Marek Szyprowski | f99d603 | 2012-05-16 18:31:23 +0200 | [diff] [blame] | 638 | void arm_dma_free(struct device *dev, size_t size, void *cpu_addr, |
| 639 | dma_addr_t handle, struct dma_attrs *attrs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | { |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 641 | struct page *page = pfn_to_page(dma_to_pfn(dev, handle)); |
Russell King | 5edf71a | 2005-11-25 15:52:51 +0000 | [diff] [blame] | 642 | |
Dmitry Baryshkov | 1fe5326 | 2008-07-18 13:30:14 +0400 | [diff] [blame] | 643 | if (dma_release_from_coherent(dev, get_order(size), cpu_addr)) |
| 644 | return; |
| 645 | |
Russell King | 3e82d01 | 2009-11-19 15:38:12 +0000 | [diff] [blame] | 646 | size = PAGE_ALIGN(size); |
| 647 | |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 648 | if (arch_is_coherent() || nommu()) { |
| 649 | __dma_free_buffer(page, size); |
Marek Szyprowski | f1ae98d | 2012-05-30 10:48:29 +0200 | [diff] [blame] | 650 | } else if (!IS_ENABLED(CONFIG_CMA)) { |
Russell King | 695ae0a | 2009-11-19 16:31:39 +0000 | [diff] [blame] | 651 | __dma_free_remap(cpu_addr, size); |
Marek Szyprowski | c790950 | 2011-12-29 13:09:51 +0100 | [diff] [blame] | 652 | __dma_free_buffer(page, size); |
| 653 | } else { |
| 654 | if (__free_from_pool(cpu_addr, size)) |
| 655 | return; |
| 656 | /* |
| 657 | * Non-atomic allocations cannot be freed with IRQs disabled |
| 658 | */ |
| 659 | WARN_ON(irqs_disabled()); |
| 660 | __free_from_contiguous(dev, page, size); |
| 661 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | } |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 663 | |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 664 | static void dma_cache_maint_page(struct page *page, unsigned long offset, |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 665 | size_t size, enum dma_data_direction dir, |
| 666 | void (*op)(const void *, size_t, int)) |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 667 | { |
| 668 | /* |
| 669 | * A single sg entry may refer to multiple physically contiguous |
| 670 | * pages. But we still need to process highmem pages individually. |
| 671 | * If highmem is not configured then the bulk of this loop gets |
| 672 | * optimized out. |
| 673 | */ |
| 674 | size_t left = size; |
| 675 | do { |
| 676 | size_t len = left; |
Russell King | 93f1d62 | 2009-11-24 14:41:01 +0000 | [diff] [blame] | 677 | void *vaddr; |
| 678 | |
| 679 | if (PageHighMem(page)) { |
| 680 | if (len + offset > PAGE_SIZE) { |
| 681 | if (offset >= PAGE_SIZE) { |
| 682 | page += offset / PAGE_SIZE; |
| 683 | offset %= PAGE_SIZE; |
| 684 | } |
| 685 | len = PAGE_SIZE - offset; |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 686 | } |
Russell King | 93f1d62 | 2009-11-24 14:41:01 +0000 | [diff] [blame] | 687 | vaddr = kmap_high_get(page); |
| 688 | if (vaddr) { |
| 689 | vaddr += offset; |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 690 | op(vaddr, len, dir); |
Russell King | 93f1d62 | 2009-11-24 14:41:01 +0000 | [diff] [blame] | 691 | kunmap_high(page); |
Nicolas Pitre | 7e5a69e | 2010-03-29 21:46:02 +0100 | [diff] [blame] | 692 | } else if (cache_is_vipt()) { |
Nicolas Pitre | 39af22a | 2010-12-15 15:14:45 -0500 | [diff] [blame] | 693 | /* unmapped pages might still be cached */ |
| 694 | vaddr = kmap_atomic(page); |
Nicolas Pitre | 7e5a69e | 2010-03-29 21:46:02 +0100 | [diff] [blame] | 695 | op(vaddr + offset, len, dir); |
Nicolas Pitre | 39af22a | 2010-12-15 15:14:45 -0500 | [diff] [blame] | 696 | kunmap_atomic(vaddr); |
Russell King | 93f1d62 | 2009-11-24 14:41:01 +0000 | [diff] [blame] | 697 | } |
| 698 | } else { |
| 699 | vaddr = page_address(page) + offset; |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 700 | op(vaddr, len, dir); |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 701 | } |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 702 | offset = 0; |
| 703 | page++; |
| 704 | left -= len; |
| 705 | } while (left); |
| 706 | } |
| 707 | |
Marek Szyprowski | 51fde349 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 708 | /* |
| 709 | * Make an area consistent for devices. |
| 710 | * Note: Drivers should NOT use this function directly, as it will break |
| 711 | * platforms with CONFIG_DMABOUNCE. |
| 712 | * Use the driver DMA support - see dma-mapping.h (dma_sync_*) |
| 713 | */ |
| 714 | static void __dma_page_cpu_to_dev(struct page *page, unsigned long off, |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 715 | size_t size, enum dma_data_direction dir) |
| 716 | { |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 717 | unsigned long paddr; |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 718 | |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 719 | dma_cache_maint_page(page, off, size, dir, dmac_map_area); |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 720 | |
Russell King | 65af191 | 2009-11-24 17:53:33 +0000 | [diff] [blame] | 721 | paddr = page_to_phys(page) + off; |
Russell King | 2ffe2da | 2009-10-31 16:52:16 +0000 | [diff] [blame] | 722 | if (dir == DMA_FROM_DEVICE) { |
| 723 | outer_inv_range(paddr, paddr + size); |
| 724 | } else { |
| 725 | outer_clean_range(paddr, paddr + size); |
| 726 | } |
| 727 | /* FIXME: non-speculating: flush on bidirectional mappings? */ |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 728 | } |
Russell King | 4ea0d73 | 2009-11-24 16:27:17 +0000 | [diff] [blame] | 729 | |
Marek Szyprowski | 51fde349 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 730 | static void __dma_page_dev_to_cpu(struct page *page, unsigned long off, |
Russell King | 4ea0d73 | 2009-11-24 16:27:17 +0000 | [diff] [blame] | 731 | size_t size, enum dma_data_direction dir) |
| 732 | { |
Russell King | 2ffe2da | 2009-10-31 16:52:16 +0000 | [diff] [blame] | 733 | unsigned long paddr = page_to_phys(page) + off; |
| 734 | |
| 735 | /* FIXME: non-speculating: not required */ |
| 736 | /* don't bother invalidating if DMA to device */ |
| 737 | if (dir != DMA_TO_DEVICE) |
| 738 | outer_inv_range(paddr, paddr + size); |
| 739 | |
Russell King | a9c9147 | 2009-11-26 16:19:58 +0000 | [diff] [blame] | 740 | dma_cache_maint_page(page, off, size, dir, dmac_unmap_area); |
Catalin Marinas | c017780 | 2010-09-13 15:57:36 +0100 | [diff] [blame] | 741 | |
| 742 | /* |
| 743 | * Mark the D-cache clean for this page to avoid extra flushing. |
| 744 | */ |
| 745 | if (dir != DMA_TO_DEVICE && off == 0 && size >= PAGE_SIZE) |
| 746 | set_bit(PG_dcache_clean, &page->flags); |
Russell King | 4ea0d73 | 2009-11-24 16:27:17 +0000 | [diff] [blame] | 747 | } |
Nicolas Pitre | 4337745 | 2009-03-12 22:52:09 -0400 | [diff] [blame] | 748 | |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 749 | /** |
Marek Szyprowski | 2a550e7 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 750 | * arm_dma_map_sg - map a set of SG buffers for streaming mode DMA |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 751 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 752 | * @sg: list of buffers |
| 753 | * @nents: number of buffers to map |
| 754 | * @dir: DMA transfer direction |
| 755 | * |
| 756 | * Map a set of buffers described by scatterlist in streaming mode for DMA. |
| 757 | * This is the scatter-gather version of the dma_map_single interface. |
| 758 | * Here the scatter gather list elements are each tagged with the |
| 759 | * appropriate dma address and length. They are obtained via |
| 760 | * sg_dma_{address,length}. |
| 761 | * |
| 762 | * Device ownership issues as mentioned for dma_map_single are the same |
| 763 | * here. |
| 764 | */ |
Marek Szyprowski | 2dc6a01 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 765 | int arm_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, |
| 766 | enum dma_data_direction dir, struct dma_attrs *attrs) |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 767 | { |
Marek Szyprowski | 2a550e7 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 768 | struct dma_map_ops *ops = get_dma_ops(dev); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 769 | struct scatterlist *s; |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 770 | int i, j; |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 771 | |
| 772 | for_each_sg(sg, s, nents, i) { |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 773 | #ifdef CONFIG_NEED_SG_DMA_LENGTH |
| 774 | s->dma_length = s->length; |
| 775 | #endif |
Marek Szyprowski | 2a550e7 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 776 | s->dma_address = ops->map_page(dev, sg_page(s), s->offset, |
| 777 | s->length, dir, attrs); |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 778 | if (dma_mapping_error(dev, s->dma_address)) |
| 779 | goto bad_mapping; |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 780 | } |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 781 | return nents; |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 782 | |
| 783 | bad_mapping: |
| 784 | for_each_sg(sg, s, i, j) |
Marek Szyprowski | 2a550e7 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 785 | ops->unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs); |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 786 | return 0; |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 787 | } |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 788 | |
| 789 | /** |
Marek Szyprowski | 2a550e7 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 790 | * arm_dma_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 791 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 792 | * @sg: list of buffers |
Linus Walleij | 0adfca6 | 2011-01-12 18:50:37 +0100 | [diff] [blame] | 793 | * @nents: number of buffers to unmap (same as was passed to dma_map_sg) |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 794 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) |
| 795 | * |
| 796 | * Unmap a set of streaming mode DMA translations. Again, CPU access |
| 797 | * rules concerning calls here are the same as for dma_unmap_single(). |
| 798 | */ |
Marek Szyprowski | 2dc6a01 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 799 | void arm_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, |
| 800 | enum dma_data_direction dir, struct dma_attrs *attrs) |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 801 | { |
Marek Szyprowski | 2a550e7 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 802 | struct dma_map_ops *ops = get_dma_ops(dev); |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 803 | struct scatterlist *s; |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 804 | |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 805 | int i; |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 806 | |
Russell King | 01135d92 | 2008-09-25 21:05:02 +0100 | [diff] [blame] | 807 | for_each_sg(sg, s, nents, i) |
Marek Szyprowski | 2a550e7 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 808 | ops->unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 809 | } |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 810 | |
| 811 | /** |
Marek Szyprowski | 2a550e7 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 812 | * arm_dma_sync_sg_for_cpu |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 813 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 814 | * @sg: list of buffers |
| 815 | * @nents: number of buffers to map (returned from dma_map_sg) |
| 816 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) |
| 817 | */ |
Marek Szyprowski | 2dc6a01 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 818 | void arm_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 819 | int nents, enum dma_data_direction dir) |
| 820 | { |
Marek Szyprowski | 2a550e7 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 821 | struct dma_map_ops *ops = get_dma_ops(dev); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 822 | struct scatterlist *s; |
| 823 | int i; |
| 824 | |
Marek Szyprowski | 2a550e7 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 825 | for_each_sg(sg, s, nents, i) |
| 826 | ops->sync_single_for_cpu(dev, sg_dma_address(s), s->length, |
| 827 | dir); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 828 | } |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 829 | |
| 830 | /** |
Marek Szyprowski | 2a550e7 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 831 | * arm_dma_sync_sg_for_device |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 832 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
| 833 | * @sg: list of buffers |
| 834 | * @nents: number of buffers to map (returned from dma_map_sg) |
| 835 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) |
| 836 | */ |
Marek Szyprowski | 2dc6a01 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 837 | void arm_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 838 | int nents, enum dma_data_direction dir) |
| 839 | { |
Marek Szyprowski | 2a550e7 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 840 | struct dma_map_ops *ops = get_dma_ops(dev); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 841 | struct scatterlist *s; |
| 842 | int i; |
| 843 | |
Marek Szyprowski | 2a550e7 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 844 | for_each_sg(sg, s, nents, i) |
| 845 | ops->sync_single_for_device(dev, sg_dma_address(s), s->length, |
| 846 | dir); |
Russell King | afd1a32 | 2008-09-25 16:30:57 +0100 | [diff] [blame] | 847 | } |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 848 | |
Russell King | 022ae53 | 2011-07-08 21:26:59 +0100 | [diff] [blame] | 849 | /* |
| 850 | * Return whether the given device DMA address mask can be supported |
| 851 | * properly. For example, if your device can only drive the low 24-bits |
| 852 | * during bus mastering, then you would pass 0x00ffffff as the mask |
| 853 | * to this function. |
| 854 | */ |
| 855 | int dma_supported(struct device *dev, u64 mask) |
| 856 | { |
| 857 | if (mask < (u64)arm_dma_limit) |
| 858 | return 0; |
| 859 | return 1; |
| 860 | } |
| 861 | EXPORT_SYMBOL(dma_supported); |
| 862 | |
Marek Szyprowski | 2dc6a01 | 2012-02-10 19:55:20 +0100 | [diff] [blame] | 863 | static int arm_dma_set_mask(struct device *dev, u64 dma_mask) |
Russell King | 022ae53 | 2011-07-08 21:26:59 +0100 | [diff] [blame] | 864 | { |
| 865 | if (!dev->dma_mask || !dma_supported(dev, dma_mask)) |
| 866 | return -EIO; |
| 867 | |
Russell King | 022ae53 | 2011-07-08 21:26:59 +0100 | [diff] [blame] | 868 | *dev->dma_mask = dma_mask; |
Russell King | 022ae53 | 2011-07-08 21:26:59 +0100 | [diff] [blame] | 869 | |
| 870 | return 0; |
| 871 | } |
Russell King | 022ae53 | 2011-07-08 21:26:59 +0100 | [diff] [blame] | 872 | |
Russell King | 24056f5 | 2011-01-03 11:29:28 +0000 | [diff] [blame] | 873 | #define PREALLOC_DMA_DEBUG_ENTRIES 4096 |
| 874 | |
| 875 | static int __init dma_debug_do_init(void) |
| 876 | { |
| 877 | dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES); |
| 878 | return 0; |
| 879 | } |
| 880 | fs_initcall(dma_debug_do_init); |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 881 | |
| 882 | #ifdef CONFIG_ARM_DMA_USE_IOMMU |
| 883 | |
| 884 | /* IOMMU */ |
| 885 | |
| 886 | static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping, |
| 887 | size_t size) |
| 888 | { |
| 889 | unsigned int order = get_order(size); |
| 890 | unsigned int align = 0; |
| 891 | unsigned int count, start; |
| 892 | unsigned long flags; |
| 893 | |
| 894 | count = ((PAGE_ALIGN(size) >> PAGE_SHIFT) + |
| 895 | (1 << mapping->order) - 1) >> mapping->order; |
| 896 | |
| 897 | if (order > mapping->order) |
| 898 | align = (1 << (order - mapping->order)) - 1; |
| 899 | |
| 900 | spin_lock_irqsave(&mapping->lock, flags); |
| 901 | start = bitmap_find_next_zero_area(mapping->bitmap, mapping->bits, 0, |
| 902 | count, align); |
| 903 | if (start > mapping->bits) { |
| 904 | spin_unlock_irqrestore(&mapping->lock, flags); |
| 905 | return DMA_ERROR_CODE; |
| 906 | } |
| 907 | |
| 908 | bitmap_set(mapping->bitmap, start, count); |
| 909 | spin_unlock_irqrestore(&mapping->lock, flags); |
| 910 | |
| 911 | return mapping->base + (start << (mapping->order + PAGE_SHIFT)); |
| 912 | } |
| 913 | |
| 914 | static inline void __free_iova(struct dma_iommu_mapping *mapping, |
| 915 | dma_addr_t addr, size_t size) |
| 916 | { |
| 917 | unsigned int start = (addr - mapping->base) >> |
| 918 | (mapping->order + PAGE_SHIFT); |
| 919 | unsigned int count = ((size >> PAGE_SHIFT) + |
| 920 | (1 << mapping->order) - 1) >> mapping->order; |
| 921 | unsigned long flags; |
| 922 | |
| 923 | spin_lock_irqsave(&mapping->lock, flags); |
| 924 | bitmap_clear(mapping->bitmap, start, count); |
| 925 | spin_unlock_irqrestore(&mapping->lock, flags); |
| 926 | } |
| 927 | |
| 928 | static struct page **__iommu_alloc_buffer(struct device *dev, size_t size, gfp_t gfp) |
| 929 | { |
| 930 | struct page **pages; |
| 931 | int count = size >> PAGE_SHIFT; |
| 932 | int array_size = count * sizeof(struct page *); |
| 933 | int i = 0; |
| 934 | |
| 935 | if (array_size <= PAGE_SIZE) |
| 936 | pages = kzalloc(array_size, gfp); |
| 937 | else |
| 938 | pages = vzalloc(array_size); |
| 939 | if (!pages) |
| 940 | return NULL; |
| 941 | |
| 942 | while (count) { |
Marek Szyprowski | 593f473 | 2012-06-21 11:48:11 +0200 | [diff] [blame] | 943 | int j, order = __fls(count); |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 944 | |
| 945 | pages[i] = alloc_pages(gfp | __GFP_NOWARN, order); |
| 946 | while (!pages[i] && order) |
| 947 | pages[i] = alloc_pages(gfp | __GFP_NOWARN, --order); |
| 948 | if (!pages[i]) |
| 949 | goto error; |
| 950 | |
| 951 | if (order) |
| 952 | split_page(pages[i], order); |
| 953 | j = 1 << order; |
| 954 | while (--j) |
| 955 | pages[i + j] = pages[i] + j; |
| 956 | |
| 957 | __dma_clear_buffer(pages[i], PAGE_SIZE << order); |
| 958 | i += 1 << order; |
| 959 | count -= 1 << order; |
| 960 | } |
| 961 | |
| 962 | return pages; |
| 963 | error: |
Marek Szyprowski | 9fa8af9 | 2012-07-27 17:12:50 +0200 | [diff] [blame] | 964 | while (i--) |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 965 | if (pages[i]) |
| 966 | __free_pages(pages[i], 0); |
Prathyush K | 46c8785 | 2012-07-16 08:59:55 +0200 | [diff] [blame] | 967 | if (array_size <= PAGE_SIZE) |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 968 | kfree(pages); |
| 969 | else |
| 970 | vfree(pages); |
| 971 | return NULL; |
| 972 | } |
| 973 | |
| 974 | static int __iommu_free_buffer(struct device *dev, struct page **pages, size_t size) |
| 975 | { |
| 976 | int count = size >> PAGE_SHIFT; |
| 977 | int array_size = count * sizeof(struct page *); |
| 978 | int i; |
| 979 | for (i = 0; i < count; i++) |
| 980 | if (pages[i]) |
| 981 | __free_pages(pages[i], 0); |
Prathyush K | 46c8785 | 2012-07-16 08:59:55 +0200 | [diff] [blame] | 982 | if (array_size <= PAGE_SIZE) |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 983 | kfree(pages); |
| 984 | else |
| 985 | vfree(pages); |
| 986 | return 0; |
| 987 | } |
| 988 | |
| 989 | /* |
| 990 | * Create a CPU mapping for a specified pages |
| 991 | */ |
| 992 | static void * |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 993 | __iommu_alloc_remap(struct page **pages, size_t size, gfp_t gfp, pgprot_t prot, |
| 994 | const void *caller) |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 995 | { |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 996 | unsigned int i, nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT; |
| 997 | struct vm_struct *area; |
| 998 | unsigned long p; |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 999 | |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 1000 | area = get_vm_area_caller(size, VM_ARM_DMA_CONSISTENT | VM_USERMAP, |
| 1001 | caller); |
| 1002 | if (!area) |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 1003 | return NULL; |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 1004 | |
| 1005 | area->pages = pages; |
| 1006 | area->nr_pages = nr_pages; |
| 1007 | p = (unsigned long)area->addr; |
| 1008 | |
| 1009 | for (i = 0; i < nr_pages; i++) { |
| 1010 | phys_addr_t phys = __pfn_to_phys(page_to_pfn(pages[i])); |
| 1011 | if (ioremap_page_range(p, p + PAGE_SIZE, phys, prot)) |
| 1012 | goto err; |
| 1013 | p += PAGE_SIZE; |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 1014 | } |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 1015 | return area->addr; |
| 1016 | err: |
| 1017 | unmap_kernel_range((unsigned long)area->addr, size); |
| 1018 | vunmap(area->addr); |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 1019 | return NULL; |
| 1020 | } |
| 1021 | |
| 1022 | /* |
| 1023 | * Create a mapping in device IO address space for specified pages |
| 1024 | */ |
| 1025 | static dma_addr_t |
| 1026 | __iommu_create_mapping(struct device *dev, struct page **pages, size_t size) |
| 1027 | { |
| 1028 | struct dma_iommu_mapping *mapping = dev->archdata.mapping; |
| 1029 | unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; |
| 1030 | dma_addr_t dma_addr, iova; |
| 1031 | int i, ret = DMA_ERROR_CODE; |
| 1032 | |
| 1033 | dma_addr = __alloc_iova(mapping, size); |
| 1034 | if (dma_addr == DMA_ERROR_CODE) |
| 1035 | return dma_addr; |
| 1036 | |
| 1037 | iova = dma_addr; |
| 1038 | for (i = 0; i < count; ) { |
| 1039 | unsigned int next_pfn = page_to_pfn(pages[i]) + 1; |
| 1040 | phys_addr_t phys = page_to_phys(pages[i]); |
| 1041 | unsigned int len, j; |
| 1042 | |
| 1043 | for (j = i + 1; j < count; j++, next_pfn++) |
| 1044 | if (page_to_pfn(pages[j]) != next_pfn) |
| 1045 | break; |
| 1046 | |
| 1047 | len = (j - i) << PAGE_SHIFT; |
| 1048 | ret = iommu_map(mapping->domain, iova, phys, len, 0); |
| 1049 | if (ret < 0) |
| 1050 | goto fail; |
| 1051 | iova += len; |
| 1052 | i = j; |
| 1053 | } |
| 1054 | return dma_addr; |
| 1055 | fail: |
| 1056 | iommu_unmap(mapping->domain, dma_addr, iova-dma_addr); |
| 1057 | __free_iova(mapping, dma_addr, size); |
| 1058 | return DMA_ERROR_CODE; |
| 1059 | } |
| 1060 | |
| 1061 | static int __iommu_remove_mapping(struct device *dev, dma_addr_t iova, size_t size) |
| 1062 | { |
| 1063 | struct dma_iommu_mapping *mapping = dev->archdata.mapping; |
| 1064 | |
| 1065 | /* |
| 1066 | * add optional in-page offset from iova to size and align |
| 1067 | * result to page size |
| 1068 | */ |
| 1069 | size = PAGE_ALIGN((iova & ~PAGE_MASK) + size); |
| 1070 | iova &= PAGE_MASK; |
| 1071 | |
| 1072 | iommu_unmap(mapping->domain, iova, size); |
| 1073 | __free_iova(mapping, iova, size); |
| 1074 | return 0; |
| 1075 | } |
| 1076 | |
Marek Szyprowski | 955c757 | 2012-05-16 19:38:58 +0100 | [diff] [blame^] | 1077 | static struct page **__iommu_get_pages(void *cpu_addr, struct dma_attrs *attrs) |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 1078 | { |
| 1079 | struct vm_struct *area; |
| 1080 | |
Marek Szyprowski | 955c757 | 2012-05-16 19:38:58 +0100 | [diff] [blame^] | 1081 | if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs)) |
| 1082 | return cpu_addr; |
| 1083 | |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 1084 | area = find_vm_area(cpu_addr); |
| 1085 | if (area && (area->flags & VM_ARM_DMA_CONSISTENT)) |
| 1086 | return area->pages; |
| 1087 | return NULL; |
| 1088 | } |
| 1089 | |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 1090 | static void *arm_iommu_alloc_attrs(struct device *dev, size_t size, |
| 1091 | dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs) |
| 1092 | { |
| 1093 | pgprot_t prot = __get_dma_pgprot(attrs, pgprot_kernel); |
| 1094 | struct page **pages; |
| 1095 | void *addr = NULL; |
| 1096 | |
| 1097 | *handle = DMA_ERROR_CODE; |
| 1098 | size = PAGE_ALIGN(size); |
| 1099 | |
| 1100 | pages = __iommu_alloc_buffer(dev, size, gfp); |
| 1101 | if (!pages) |
| 1102 | return NULL; |
| 1103 | |
| 1104 | *handle = __iommu_create_mapping(dev, pages, size); |
| 1105 | if (*handle == DMA_ERROR_CODE) |
| 1106 | goto err_buffer; |
| 1107 | |
Marek Szyprowski | 955c757 | 2012-05-16 19:38:58 +0100 | [diff] [blame^] | 1108 | if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs)) |
| 1109 | return pages; |
| 1110 | |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 1111 | addr = __iommu_alloc_remap(pages, size, gfp, prot, |
| 1112 | __builtin_return_address(0)); |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 1113 | if (!addr) |
| 1114 | goto err_mapping; |
| 1115 | |
| 1116 | return addr; |
| 1117 | |
| 1118 | err_mapping: |
| 1119 | __iommu_remove_mapping(dev, *handle, size); |
| 1120 | err_buffer: |
| 1121 | __iommu_free_buffer(dev, pages, size); |
| 1122 | return NULL; |
| 1123 | } |
| 1124 | |
| 1125 | static int arm_iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma, |
| 1126 | void *cpu_addr, dma_addr_t dma_addr, size_t size, |
| 1127 | struct dma_attrs *attrs) |
| 1128 | { |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 1129 | unsigned long uaddr = vma->vm_start; |
| 1130 | unsigned long usize = vma->vm_end - vma->vm_start; |
Marek Szyprowski | 955c757 | 2012-05-16 19:38:58 +0100 | [diff] [blame^] | 1131 | struct page **pages = __iommu_get_pages(cpu_addr, attrs); |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 1132 | |
| 1133 | vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot); |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 1134 | |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 1135 | if (!pages) |
| 1136 | return -ENXIO; |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 1137 | |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 1138 | do { |
| 1139 | int ret = vm_insert_page(vma, uaddr, *pages++); |
| 1140 | if (ret) { |
| 1141 | pr_err("Remapping memory failed: %d\n", ret); |
| 1142 | return ret; |
| 1143 | } |
| 1144 | uaddr += PAGE_SIZE; |
| 1145 | usize -= PAGE_SIZE; |
| 1146 | } while (usize > 0); |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 1147 | |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 1148 | return 0; |
| 1149 | } |
| 1150 | |
| 1151 | /* |
| 1152 | * free a page as defined by the above mapping. |
| 1153 | * Must not be called with IRQs disabled. |
| 1154 | */ |
| 1155 | void arm_iommu_free_attrs(struct device *dev, size_t size, void *cpu_addr, |
| 1156 | dma_addr_t handle, struct dma_attrs *attrs) |
| 1157 | { |
Marek Szyprowski | 955c757 | 2012-05-16 19:38:58 +0100 | [diff] [blame^] | 1158 | struct page **pages = __iommu_get_pages(cpu_addr, attrs); |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 1159 | size = PAGE_ALIGN(size); |
| 1160 | |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 1161 | if (!pages) { |
| 1162 | WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr); |
| 1163 | return; |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 1164 | } |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 1165 | |
Marek Szyprowski | 955c757 | 2012-05-16 19:38:58 +0100 | [diff] [blame^] | 1166 | if (!dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs)) { |
| 1167 | unmap_kernel_range((unsigned long)cpu_addr, size); |
| 1168 | vunmap(cpu_addr); |
| 1169 | } |
Marek Szyprowski | e9da6e9 | 2012-07-30 09:11:33 +0200 | [diff] [blame] | 1170 | |
| 1171 | __iommu_remove_mapping(dev, handle, size); |
| 1172 | __iommu_free_buffer(dev, pages, size); |
Marek Szyprowski | 4ce63fc | 2012-05-16 15:48:21 +0200 | [diff] [blame] | 1173 | } |
| 1174 | |
| 1175 | /* |
| 1176 | * Map a part of the scatter-gather list into contiguous io address space |
| 1177 | */ |
| 1178 | static int __map_sg_chunk(struct device *dev, struct scatterlist *sg, |
| 1179 | size_t size, dma_addr_t *handle, |
| 1180 | enum dma_data_direction dir) |
| 1181 | { |
| 1182 | struct dma_iommu_mapping *mapping = dev->archdata.mapping; |
| 1183 | dma_addr_t iova, iova_base; |
| 1184 | int ret = 0; |
| 1185 | unsigned int count; |
| 1186 | struct scatterlist *s; |
| 1187 | |
| 1188 | size = PAGE_ALIGN(size); |
| 1189 | *handle = DMA_ERROR_CODE; |
| 1190 | |
| 1191 | iova_base = iova = __alloc_iova(mapping, size); |
| 1192 | if (iova == DMA_ERROR_CODE) |
| 1193 | return -ENOMEM; |
| 1194 | |
| 1195 | for (count = 0, s = sg; count < (size >> PAGE_SHIFT); s = sg_next(s)) { |
| 1196 | phys_addr_t phys = page_to_phys(sg_page(s)); |
| 1197 | unsigned int len = PAGE_ALIGN(s->offset + s->length); |
| 1198 | |
| 1199 | if (!arch_is_coherent()) |
| 1200 | __dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, dir); |
| 1201 | |
| 1202 | ret = iommu_map(mapping->domain, iova, phys, len, 0); |
| 1203 | if (ret < 0) |
| 1204 | goto fail; |
| 1205 | count += len >> PAGE_SHIFT; |
| 1206 | iova += len; |
| 1207 | } |
| 1208 | *handle = iova_base; |
| 1209 | |
| 1210 | return 0; |
| 1211 | fail: |
| 1212 | iommu_unmap(mapping->domain, iova_base, count * PAGE_SIZE); |
| 1213 | __free_iova(mapping, iova_base, size); |
| 1214 | return ret; |
| 1215 | } |
| 1216 | |
| 1217 | /** |
| 1218 | * arm_iommu_map_sg - map a set of SG buffers for streaming mode DMA |
| 1219 | * @dev: valid struct device pointer |
| 1220 | * @sg: list of buffers |
| 1221 | * @nents: number of buffers to map |
| 1222 | * @dir: DMA transfer direction |
| 1223 | * |
| 1224 | * Map a set of buffers described by scatterlist in streaming mode for DMA. |
| 1225 | * The scatter gather list elements are merged together (if possible) and |
| 1226 | * tagged with the appropriate dma address and length. They are obtained via |
| 1227 | * sg_dma_{address,length}. |
| 1228 | */ |
| 1229 | int arm_iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents, |
| 1230 | enum dma_data_direction dir, struct dma_attrs *attrs) |
| 1231 | { |
| 1232 | struct scatterlist *s = sg, *dma = sg, *start = sg; |
| 1233 | int i, count = 0; |
| 1234 | unsigned int offset = s->offset; |
| 1235 | unsigned int size = s->offset + s->length; |
| 1236 | unsigned int max = dma_get_max_seg_size(dev); |
| 1237 | |
| 1238 | for (i = 1; i < nents; i++) { |
| 1239 | s = sg_next(s); |
| 1240 | |
| 1241 | s->dma_address = DMA_ERROR_CODE; |
| 1242 | s->dma_length = 0; |
| 1243 | |
| 1244 | if (s->offset || (size & ~PAGE_MASK) || size + s->length > max) { |
| 1245 | if (__map_sg_chunk(dev, start, size, &dma->dma_address, |
| 1246 | dir) < 0) |
| 1247 | goto bad_mapping; |
| 1248 | |
| 1249 | dma->dma_address += offset; |
| 1250 | dma->dma_length = size - offset; |
| 1251 | |
| 1252 | size = offset = s->offset; |
| 1253 | start = s; |
| 1254 | dma = sg_next(dma); |
| 1255 | count += 1; |
| 1256 | } |
| 1257 | size += s->length; |
| 1258 | } |
| 1259 | if (__map_sg_chunk(dev, start, size, &dma->dma_address, dir) < 0) |
| 1260 | goto bad_mapping; |
| 1261 | |
| 1262 | dma->dma_address += offset; |
| 1263 | dma->dma_length = size - offset; |
| 1264 | |
| 1265 | return count+1; |
| 1266 | |
| 1267 | bad_mapping: |
| 1268 | for_each_sg(sg, s, count, i) |
| 1269 | __iommu_remove_mapping(dev, sg_dma_address(s), sg_dma_len(s)); |
| 1270 | return 0; |
| 1271 | } |
| 1272 | |
| 1273 | /** |
| 1274 | * arm_iommu_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg |
| 1275 | * @dev: valid struct device pointer |
| 1276 | * @sg: list of buffers |
| 1277 | * @nents: number of buffers to unmap (same as was passed to dma_map_sg) |
| 1278 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) |
| 1279 | * |
| 1280 | * Unmap a set of streaming mode DMA translations. Again, CPU access |
| 1281 | * rules concerning calls here are the same as for dma_unmap_single(). |
| 1282 | */ |
| 1283 | void arm_iommu_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, |
| 1284 | enum dma_data_direction dir, struct dma_attrs *attrs) |
| 1285 | { |
| 1286 | struct scatterlist *s; |
| 1287 | int i; |
| 1288 | |
| 1289 | for_each_sg(sg, s, nents, i) { |
| 1290 | if (sg_dma_len(s)) |
| 1291 | __iommu_remove_mapping(dev, sg_dma_address(s), |
| 1292 | sg_dma_len(s)); |
| 1293 | if (!arch_is_coherent()) |
| 1294 | __dma_page_dev_to_cpu(sg_page(s), s->offset, |
| 1295 | s->length, dir); |
| 1296 | } |
| 1297 | } |
| 1298 | |
| 1299 | /** |
| 1300 | * arm_iommu_sync_sg_for_cpu |
| 1301 | * @dev: valid struct device pointer |
| 1302 | * @sg: list of buffers |
| 1303 | * @nents: number of buffers to map (returned from dma_map_sg) |
| 1304 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) |
| 1305 | */ |
| 1306 | void arm_iommu_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, |
| 1307 | int nents, enum dma_data_direction dir) |
| 1308 | { |
| 1309 | struct scatterlist *s; |
| 1310 | int i; |
| 1311 | |
| 1312 | for_each_sg(sg, s, nents, i) |
| 1313 | if (!arch_is_coherent()) |
| 1314 | __dma_page_dev_to_cpu(sg_page(s), s->offset, s->length, dir); |
| 1315 | |
| 1316 | } |
| 1317 | |
| 1318 | /** |
| 1319 | * arm_iommu_sync_sg_for_device |
| 1320 | * @dev: valid struct device pointer |
| 1321 | * @sg: list of buffers |
| 1322 | * @nents: number of buffers to map (returned from dma_map_sg) |
| 1323 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) |
| 1324 | */ |
| 1325 | void arm_iommu_sync_sg_for_device(struct device *dev, struct scatterlist *sg, |
| 1326 | int nents, enum dma_data_direction dir) |
| 1327 | { |
| 1328 | struct scatterlist *s; |
| 1329 | int i; |
| 1330 | |
| 1331 | for_each_sg(sg, s, nents, i) |
| 1332 | if (!arch_is_coherent()) |
| 1333 | __dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, dir); |
| 1334 | } |
| 1335 | |
| 1336 | |
| 1337 | /** |
| 1338 | * arm_iommu_map_page |
| 1339 | * @dev: valid struct device pointer |
| 1340 | * @page: page that buffer resides in |
| 1341 | * @offset: offset into page for start of buffer |
| 1342 | * @size: size of buffer to map |
| 1343 | * @dir: DMA transfer direction |
| 1344 | * |
| 1345 | * IOMMU aware version of arm_dma_map_page() |
| 1346 | */ |
| 1347 | static dma_addr_t arm_iommu_map_page(struct device *dev, struct page *page, |
| 1348 | unsigned long offset, size_t size, enum dma_data_direction dir, |
| 1349 | struct dma_attrs *attrs) |
| 1350 | { |
| 1351 | struct dma_iommu_mapping *mapping = dev->archdata.mapping; |
| 1352 | dma_addr_t dma_addr; |
| 1353 | int ret, len = PAGE_ALIGN(size + offset); |
| 1354 | |
| 1355 | if (!arch_is_coherent()) |
| 1356 | __dma_page_cpu_to_dev(page, offset, size, dir); |
| 1357 | |
| 1358 | dma_addr = __alloc_iova(mapping, len); |
| 1359 | if (dma_addr == DMA_ERROR_CODE) |
| 1360 | return dma_addr; |
| 1361 | |
| 1362 | ret = iommu_map(mapping->domain, dma_addr, page_to_phys(page), len, 0); |
| 1363 | if (ret < 0) |
| 1364 | goto fail; |
| 1365 | |
| 1366 | return dma_addr + offset; |
| 1367 | fail: |
| 1368 | __free_iova(mapping, dma_addr, len); |
| 1369 | return DMA_ERROR_CODE; |
| 1370 | } |
| 1371 | |
| 1372 | /** |
| 1373 | * arm_iommu_unmap_page |
| 1374 | * @dev: valid struct device pointer |
| 1375 | * @handle: DMA address of buffer |
| 1376 | * @size: size of buffer (same as passed to dma_map_page) |
| 1377 | * @dir: DMA transfer direction (same as passed to dma_map_page) |
| 1378 | * |
| 1379 | * IOMMU aware version of arm_dma_unmap_page() |
| 1380 | */ |
| 1381 | static void arm_iommu_unmap_page(struct device *dev, dma_addr_t handle, |
| 1382 | size_t size, enum dma_data_direction dir, |
| 1383 | struct dma_attrs *attrs) |
| 1384 | { |
| 1385 | struct dma_iommu_mapping *mapping = dev->archdata.mapping; |
| 1386 | dma_addr_t iova = handle & PAGE_MASK; |
| 1387 | struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova)); |
| 1388 | int offset = handle & ~PAGE_MASK; |
| 1389 | int len = PAGE_ALIGN(size + offset); |
| 1390 | |
| 1391 | if (!iova) |
| 1392 | return; |
| 1393 | |
| 1394 | if (!arch_is_coherent()) |
| 1395 | __dma_page_dev_to_cpu(page, offset, size, dir); |
| 1396 | |
| 1397 | iommu_unmap(mapping->domain, iova, len); |
| 1398 | __free_iova(mapping, iova, len); |
| 1399 | } |
| 1400 | |
| 1401 | static void arm_iommu_sync_single_for_cpu(struct device *dev, |
| 1402 | dma_addr_t handle, size_t size, enum dma_data_direction dir) |
| 1403 | { |
| 1404 | struct dma_iommu_mapping *mapping = dev->archdata.mapping; |
| 1405 | dma_addr_t iova = handle & PAGE_MASK; |
| 1406 | struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova)); |
| 1407 | unsigned int offset = handle & ~PAGE_MASK; |
| 1408 | |
| 1409 | if (!iova) |
| 1410 | return; |
| 1411 | |
| 1412 | if (!arch_is_coherent()) |
| 1413 | __dma_page_dev_to_cpu(page, offset, size, dir); |
| 1414 | } |
| 1415 | |
| 1416 | static void arm_iommu_sync_single_for_device(struct device *dev, |
| 1417 | dma_addr_t handle, size_t size, enum dma_data_direction dir) |
| 1418 | { |
| 1419 | struct dma_iommu_mapping *mapping = dev->archdata.mapping; |
| 1420 | dma_addr_t iova = handle & PAGE_MASK; |
| 1421 | struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova)); |
| 1422 | unsigned int offset = handle & ~PAGE_MASK; |
| 1423 | |
| 1424 | if (!iova) |
| 1425 | return; |
| 1426 | |
| 1427 | __dma_page_cpu_to_dev(page, offset, size, dir); |
| 1428 | } |
| 1429 | |
| 1430 | struct dma_map_ops iommu_ops = { |
| 1431 | .alloc = arm_iommu_alloc_attrs, |
| 1432 | .free = arm_iommu_free_attrs, |
| 1433 | .mmap = arm_iommu_mmap_attrs, |
| 1434 | |
| 1435 | .map_page = arm_iommu_map_page, |
| 1436 | .unmap_page = arm_iommu_unmap_page, |
| 1437 | .sync_single_for_cpu = arm_iommu_sync_single_for_cpu, |
| 1438 | .sync_single_for_device = arm_iommu_sync_single_for_device, |
| 1439 | |
| 1440 | .map_sg = arm_iommu_map_sg, |
| 1441 | .unmap_sg = arm_iommu_unmap_sg, |
| 1442 | .sync_sg_for_cpu = arm_iommu_sync_sg_for_cpu, |
| 1443 | .sync_sg_for_device = arm_iommu_sync_sg_for_device, |
| 1444 | }; |
| 1445 | |
| 1446 | /** |
| 1447 | * arm_iommu_create_mapping |
| 1448 | * @bus: pointer to the bus holding the client device (for IOMMU calls) |
| 1449 | * @base: start address of the valid IO address space |
| 1450 | * @size: size of the valid IO address space |
| 1451 | * @order: accuracy of the IO addresses allocations |
| 1452 | * |
| 1453 | * Creates a mapping structure which holds information about used/unused |
| 1454 | * IO address ranges, which is required to perform memory allocation and |
| 1455 | * mapping with IOMMU aware functions. |
| 1456 | * |
| 1457 | * The client device need to be attached to the mapping with |
| 1458 | * arm_iommu_attach_device function. |
| 1459 | */ |
| 1460 | struct dma_iommu_mapping * |
| 1461 | arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, size_t size, |
| 1462 | int order) |
| 1463 | { |
| 1464 | unsigned int count = size >> (PAGE_SHIFT + order); |
| 1465 | unsigned int bitmap_size = BITS_TO_LONGS(count) * sizeof(long); |
| 1466 | struct dma_iommu_mapping *mapping; |
| 1467 | int err = -ENOMEM; |
| 1468 | |
| 1469 | if (!count) |
| 1470 | return ERR_PTR(-EINVAL); |
| 1471 | |
| 1472 | mapping = kzalloc(sizeof(struct dma_iommu_mapping), GFP_KERNEL); |
| 1473 | if (!mapping) |
| 1474 | goto err; |
| 1475 | |
| 1476 | mapping->bitmap = kzalloc(bitmap_size, GFP_KERNEL); |
| 1477 | if (!mapping->bitmap) |
| 1478 | goto err2; |
| 1479 | |
| 1480 | mapping->base = base; |
| 1481 | mapping->bits = BITS_PER_BYTE * bitmap_size; |
| 1482 | mapping->order = order; |
| 1483 | spin_lock_init(&mapping->lock); |
| 1484 | |
| 1485 | mapping->domain = iommu_domain_alloc(bus); |
| 1486 | if (!mapping->domain) |
| 1487 | goto err3; |
| 1488 | |
| 1489 | kref_init(&mapping->kref); |
| 1490 | return mapping; |
| 1491 | err3: |
| 1492 | kfree(mapping->bitmap); |
| 1493 | err2: |
| 1494 | kfree(mapping); |
| 1495 | err: |
| 1496 | return ERR_PTR(err); |
| 1497 | } |
| 1498 | |
| 1499 | static void release_iommu_mapping(struct kref *kref) |
| 1500 | { |
| 1501 | struct dma_iommu_mapping *mapping = |
| 1502 | container_of(kref, struct dma_iommu_mapping, kref); |
| 1503 | |
| 1504 | iommu_domain_free(mapping->domain); |
| 1505 | kfree(mapping->bitmap); |
| 1506 | kfree(mapping); |
| 1507 | } |
| 1508 | |
| 1509 | void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping) |
| 1510 | { |
| 1511 | if (mapping) |
| 1512 | kref_put(&mapping->kref, release_iommu_mapping); |
| 1513 | } |
| 1514 | |
| 1515 | /** |
| 1516 | * arm_iommu_attach_device |
| 1517 | * @dev: valid struct device pointer |
| 1518 | * @mapping: io address space mapping structure (returned from |
| 1519 | * arm_iommu_create_mapping) |
| 1520 | * |
| 1521 | * Attaches specified io address space mapping to the provided device, |
| 1522 | * this replaces the dma operations (dma_map_ops pointer) with the |
| 1523 | * IOMMU aware version. More than one client might be attached to |
| 1524 | * the same io address space mapping. |
| 1525 | */ |
| 1526 | int arm_iommu_attach_device(struct device *dev, |
| 1527 | struct dma_iommu_mapping *mapping) |
| 1528 | { |
| 1529 | int err; |
| 1530 | |
| 1531 | err = iommu_attach_device(mapping->domain, dev); |
| 1532 | if (err) |
| 1533 | return err; |
| 1534 | |
| 1535 | kref_get(&mapping->kref); |
| 1536 | dev->archdata.mapping = mapping; |
| 1537 | set_dma_ops(dev, &iommu_ops); |
| 1538 | |
| 1539 | pr_info("Attached IOMMU controller to %s device.\n", dev_name(dev)); |
| 1540 | return 0; |
| 1541 | } |
| 1542 | |
| 1543 | #endif |