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Commit | Line | Data |
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1da177e4 | 1 | /* |
0ddbccd1 | 2 | * linux/arch/arm/mm/dma-mapping.c |
1da177e4 LT |
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> | |
5a0e3ad6 | 14 | #include <linux/gfp.h> |
1da177e4 LT |
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> | |
c7909509 | 20 | #include <linux/dma-contiguous.h> |
39af22a7 | 21 | #include <linux/highmem.h> |
c7909509 | 22 | #include <linux/memblock.h> |
99d1717d | 23 | #include <linux/slab.h> |
4ce63fcd | 24 | #include <linux/iommu.h> |
e9da6e99 | 25 | #include <linux/io.h> |
4ce63fcd | 26 | #include <linux/vmalloc.h> |
158e8bfe | 27 | #include <linux/sizes.h> |
1da177e4 | 28 | |
23759dc6 | 29 | #include <asm/memory.h> |
43377453 | 30 | #include <asm/highmem.h> |
1da177e4 | 31 | #include <asm/cacheflush.h> |
1da177e4 | 32 | #include <asm/tlbflush.h> |
99d1717d | 33 | #include <asm/mach/arch.h> |
4ce63fcd | 34 | #include <asm/dma-iommu.h> |
c7909509 MS |
35 | #include <asm/mach/map.h> |
36 | #include <asm/system_info.h> | |
37 | #include <asm/dma-contiguous.h> | |
37134cd5 | 38 | |
022ae537 RK |
39 | #include "mm.h" |
40 | ||
15237e1f MS |
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 | * | |
15237e1f | 52 | */ |
51fde349 | 53 | static void __dma_page_cpu_to_dev(struct page *, unsigned long, |
15237e1f | 54 | size_t, enum dma_data_direction); |
51fde349 | 55 | static void __dma_page_dev_to_cpu(struct page *, unsigned long, |
15237e1f MS |
56 | size_t, enum dma_data_direction); |
57 | ||
2dc6a016 MS |
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 | */ | |
51fde349 | 72 | static dma_addr_t arm_dma_map_page(struct device *dev, struct page *page, |
2dc6a016 MS |
73 | unsigned long offset, size_t size, enum dma_data_direction dir, |
74 | struct dma_attrs *attrs) | |
75 | { | |
dd37e940 | 76 | if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) |
51fde349 MS |
77 | __dma_page_cpu_to_dev(page, offset, size, dir); |
78 | return pfn_to_dma(dev, page_to_pfn(page)) + offset; | |
2dc6a016 MS |
79 | } |
80 | ||
dd37e940 RH |
81 | static dma_addr_t arm_coherent_dma_map_page(struct device *dev, struct page *page, |
82 | unsigned long offset, size_t size, enum dma_data_direction dir, | |
83 | struct dma_attrs *attrs) | |
84 | { | |
85 | return pfn_to_dma(dev, page_to_pfn(page)) + offset; | |
86 | } | |
87 | ||
2dc6a016 MS |
88 | /** |
89 | * arm_dma_unmap_page - unmap a buffer previously mapped through dma_map_page() | |
90 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices | |
91 | * @handle: DMA address of buffer | |
92 | * @size: size of buffer (same as passed to dma_map_page) | |
93 | * @dir: DMA transfer direction (same as passed to dma_map_page) | |
94 | * | |
95 | * Unmap a page streaming mode DMA translation. The handle and size | |
96 | * must match what was provided in the previous dma_map_page() call. | |
97 | * All other usages are undefined. | |
98 | * | |
99 | * After this call, reads by the CPU to the buffer are guaranteed to see | |
100 | * whatever the device wrote there. | |
101 | */ | |
51fde349 | 102 | static void arm_dma_unmap_page(struct device *dev, dma_addr_t handle, |
2dc6a016 MS |
103 | size_t size, enum dma_data_direction dir, |
104 | struct dma_attrs *attrs) | |
105 | { | |
dd37e940 | 106 | if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) |
51fde349 MS |
107 | __dma_page_dev_to_cpu(pfn_to_page(dma_to_pfn(dev, handle)), |
108 | handle & ~PAGE_MASK, size, dir); | |
2dc6a016 MS |
109 | } |
110 | ||
51fde349 | 111 | static void arm_dma_sync_single_for_cpu(struct device *dev, |
2dc6a016 MS |
112 | dma_addr_t handle, size_t size, enum dma_data_direction dir) |
113 | { | |
114 | unsigned int offset = handle & (PAGE_SIZE - 1); | |
115 | struct page *page = pfn_to_page(dma_to_pfn(dev, handle-offset)); | |
dd37e940 | 116 | __dma_page_dev_to_cpu(page, offset, size, dir); |
2dc6a016 MS |
117 | } |
118 | ||
51fde349 | 119 | static void arm_dma_sync_single_for_device(struct device *dev, |
2dc6a016 MS |
120 | dma_addr_t handle, size_t size, enum dma_data_direction dir) |
121 | { | |
122 | unsigned int offset = handle & (PAGE_SIZE - 1); | |
123 | struct page *page = pfn_to_page(dma_to_pfn(dev, handle-offset)); | |
dd37e940 | 124 | __dma_page_cpu_to_dev(page, offset, size, dir); |
2dc6a016 MS |
125 | } |
126 | ||
127 | static int arm_dma_set_mask(struct device *dev, u64 dma_mask); | |
128 | ||
129 | struct dma_map_ops arm_dma_ops = { | |
f99d6034 MS |
130 | .alloc = arm_dma_alloc, |
131 | .free = arm_dma_free, | |
132 | .mmap = arm_dma_mmap, | |
dc2832e1 | 133 | .get_sgtable = arm_dma_get_sgtable, |
2dc6a016 MS |
134 | .map_page = arm_dma_map_page, |
135 | .unmap_page = arm_dma_unmap_page, | |
136 | .map_sg = arm_dma_map_sg, | |
137 | .unmap_sg = arm_dma_unmap_sg, | |
138 | .sync_single_for_cpu = arm_dma_sync_single_for_cpu, | |
139 | .sync_single_for_device = arm_dma_sync_single_for_device, | |
140 | .sync_sg_for_cpu = arm_dma_sync_sg_for_cpu, | |
141 | .sync_sg_for_device = arm_dma_sync_sg_for_device, | |
142 | .set_dma_mask = arm_dma_set_mask, | |
143 | }; | |
144 | EXPORT_SYMBOL(arm_dma_ops); | |
145 | ||
dd37e940 RH |
146 | static void *arm_coherent_dma_alloc(struct device *dev, size_t size, |
147 | dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs); | |
148 | static void arm_coherent_dma_free(struct device *dev, size_t size, void *cpu_addr, | |
149 | dma_addr_t handle, struct dma_attrs *attrs); | |
150 | ||
151 | struct dma_map_ops arm_coherent_dma_ops = { | |
152 | .alloc = arm_coherent_dma_alloc, | |
153 | .free = arm_coherent_dma_free, | |
154 | .mmap = arm_dma_mmap, | |
155 | .get_sgtable = arm_dma_get_sgtable, | |
156 | .map_page = arm_coherent_dma_map_page, | |
157 | .map_sg = arm_dma_map_sg, | |
158 | .set_dma_mask = arm_dma_set_mask, | |
159 | }; | |
160 | EXPORT_SYMBOL(arm_coherent_dma_ops); | |
161 | ||
ab6494f0 CM |
162 | static u64 get_coherent_dma_mask(struct device *dev) |
163 | { | |
022ae537 | 164 | u64 mask = (u64)arm_dma_limit; |
ab6494f0 CM |
165 | |
166 | if (dev) { | |
167 | mask = dev->coherent_dma_mask; | |
168 | ||
169 | /* | |
170 | * Sanity check the DMA mask - it must be non-zero, and | |
171 | * must be able to be satisfied by a DMA allocation. | |
172 | */ | |
173 | if (mask == 0) { | |
174 | dev_warn(dev, "coherent DMA mask is unset\n"); | |
175 | return 0; | |
176 | } | |
177 | ||
022ae537 | 178 | if ((~mask) & (u64)arm_dma_limit) { |
ab6494f0 CM |
179 | dev_warn(dev, "coherent DMA mask %#llx is smaller " |
180 | "than system GFP_DMA mask %#llx\n", | |
022ae537 | 181 | mask, (u64)arm_dma_limit); |
ab6494f0 CM |
182 | return 0; |
183 | } | |
184 | } | |
1da177e4 | 185 | |
ab6494f0 CM |
186 | return mask; |
187 | } | |
188 | ||
c7909509 MS |
189 | static void __dma_clear_buffer(struct page *page, size_t size) |
190 | { | |
191 | void *ptr; | |
192 | /* | |
193 | * Ensure that the allocated pages are zeroed, and that any data | |
194 | * lurking in the kernel direct-mapped region is invalidated. | |
195 | */ | |
196 | ptr = page_address(page); | |
4ce63fcd MS |
197 | if (ptr) { |
198 | memset(ptr, 0, size); | |
199 | dmac_flush_range(ptr, ptr + size); | |
200 | outer_flush_range(__pa(ptr), __pa(ptr) + size); | |
201 | } | |
c7909509 MS |
202 | } |
203 | ||
7a9a32a9 RK |
204 | /* |
205 | * Allocate a DMA buffer for 'dev' of size 'size' using the | |
206 | * specified gfp mask. Note that 'size' must be page aligned. | |
207 | */ | |
208 | static struct page *__dma_alloc_buffer(struct device *dev, size_t size, gfp_t gfp) | |
209 | { | |
210 | unsigned long order = get_order(size); | |
211 | struct page *page, *p, *e; | |
7a9a32a9 RK |
212 | |
213 | page = alloc_pages(gfp, order); | |
214 | if (!page) | |
215 | return NULL; | |
216 | ||
217 | /* | |
218 | * Now split the huge page and free the excess pages | |
219 | */ | |
220 | split_page(page, order); | |
221 | for (p = page + (size >> PAGE_SHIFT), e = page + (1 << order); p < e; p++) | |
222 | __free_page(p); | |
223 | ||
c7909509 | 224 | __dma_clear_buffer(page, size); |
7a9a32a9 RK |
225 | |
226 | return page; | |
227 | } | |
228 | ||
229 | /* | |
230 | * Free a DMA buffer. 'size' must be page aligned. | |
231 | */ | |
232 | static void __dma_free_buffer(struct page *page, size_t size) | |
233 | { | |
234 | struct page *e = page + (size >> PAGE_SHIFT); | |
235 | ||
236 | while (page < e) { | |
237 | __free_page(page); | |
238 | page++; | |
239 | } | |
240 | } | |
241 | ||
ab6494f0 | 242 | #ifdef CONFIG_MMU |
e9da6e99 MS |
243 | #ifdef CONFIG_HUGETLB_PAGE |
244 | #error ARM Coherent DMA allocator does not (yet) support huge TLB | |
245 | #endif | |
a5e9d38b | 246 | |
e9da6e99 MS |
247 | static void *__alloc_from_contiguous(struct device *dev, size_t size, |
248 | pgprot_t prot, struct page **ret_page); | |
99d1717d | 249 | |
e9da6e99 MS |
250 | static void *__alloc_remap_buffer(struct device *dev, size_t size, gfp_t gfp, |
251 | pgprot_t prot, struct page **ret_page, | |
252 | const void *caller); | |
99d1717d | 253 | |
e9da6e99 MS |
254 | static void * |
255 | __dma_alloc_remap(struct page *page, size_t size, gfp_t gfp, pgprot_t prot, | |
256 | const void *caller) | |
99d1717d | 257 | { |
e9da6e99 MS |
258 | struct vm_struct *area; |
259 | unsigned long addr; | |
99d1717d | 260 | |
e9da6e99 MS |
261 | /* |
262 | * DMA allocation can be mapped to user space, so lets | |
263 | * set VM_USERMAP flags too. | |
264 | */ | |
265 | area = get_vm_area_caller(size, VM_ARM_DMA_CONSISTENT | VM_USERMAP, | |
266 | caller); | |
267 | if (!area) | |
268 | return NULL; | |
269 | addr = (unsigned long)area->addr; | |
270 | area->phys_addr = __pfn_to_phys(page_to_pfn(page)); | |
99d1717d | 271 | |
e9da6e99 MS |
272 | if (ioremap_page_range(addr, addr + size, area->phys_addr, prot)) { |
273 | vunmap((void *)addr); | |
274 | return NULL; | |
275 | } | |
276 | return (void *)addr; | |
99d1717d | 277 | } |
1da177e4 | 278 | |
e9da6e99 | 279 | static void __dma_free_remap(void *cpu_addr, size_t size) |
88c58f3b | 280 | { |
e9da6e99 MS |
281 | unsigned int flags = VM_ARM_DMA_CONSISTENT | VM_USERMAP; |
282 | struct vm_struct *area = find_vm_area(cpu_addr); | |
283 | if (!area || (area->flags & flags) != flags) { | |
284 | WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr); | |
285 | return; | |
99d1717d | 286 | } |
e9da6e99 MS |
287 | unmap_kernel_range((unsigned long)cpu_addr, size); |
288 | vunmap(cpu_addr); | |
88c58f3b | 289 | } |
88c58f3b | 290 | |
6e5267aa MS |
291 | #define DEFAULT_DMA_COHERENT_POOL_SIZE SZ_256K |
292 | ||
e9da6e99 MS |
293 | struct dma_pool { |
294 | size_t size; | |
295 | spinlock_t lock; | |
296 | unsigned long *bitmap; | |
297 | unsigned long nr_pages; | |
298 | void *vaddr; | |
6b3fe472 | 299 | struct page **pages; |
c7909509 MS |
300 | }; |
301 | ||
e9da6e99 | 302 | static struct dma_pool atomic_pool = { |
6e5267aa | 303 | .size = DEFAULT_DMA_COHERENT_POOL_SIZE, |
e9da6e99 | 304 | }; |
c7909509 MS |
305 | |
306 | static int __init early_coherent_pool(char *p) | |
307 | { | |
e9da6e99 | 308 | atomic_pool.size = memparse(p, &p); |
c7909509 MS |
309 | return 0; |
310 | } | |
311 | early_param("coherent_pool", early_coherent_pool); | |
312 | ||
6e5267aa MS |
313 | void __init init_dma_coherent_pool_size(unsigned long size) |
314 | { | |
315 | /* | |
316 | * Catch any attempt to set the pool size too late. | |
317 | */ | |
318 | BUG_ON(atomic_pool.vaddr); | |
319 | ||
320 | /* | |
321 | * Set architecture specific coherent pool size only if | |
322 | * it has not been changed by kernel command line parameter. | |
323 | */ | |
324 | if (atomic_pool.size == DEFAULT_DMA_COHERENT_POOL_SIZE) | |
325 | atomic_pool.size = size; | |
326 | } | |
327 | ||
c7909509 MS |
328 | /* |
329 | * Initialise the coherent pool for atomic allocations. | |
330 | */ | |
e9da6e99 | 331 | static int __init atomic_pool_init(void) |
c7909509 | 332 | { |
e9da6e99 | 333 | struct dma_pool *pool = &atomic_pool; |
c7909509 | 334 | pgprot_t prot = pgprot_dmacoherent(pgprot_kernel); |
e9da6e99 MS |
335 | unsigned long nr_pages = pool->size >> PAGE_SHIFT; |
336 | unsigned long *bitmap; | |
c7909509 | 337 | struct page *page; |
6b3fe472 | 338 | struct page **pages; |
c7909509 | 339 | void *ptr; |
e9da6e99 | 340 | int bitmap_size = BITS_TO_LONGS(nr_pages) * sizeof(long); |
c7909509 | 341 | |
e9da6e99 MS |
342 | bitmap = kzalloc(bitmap_size, GFP_KERNEL); |
343 | if (!bitmap) | |
344 | goto no_bitmap; | |
c7909509 | 345 | |
6b3fe472 HD |
346 | pages = kzalloc(nr_pages * sizeof(struct page *), GFP_KERNEL); |
347 | if (!pages) | |
348 | goto no_pages; | |
349 | ||
e9da6e99 MS |
350 | if (IS_ENABLED(CONFIG_CMA)) |
351 | ptr = __alloc_from_contiguous(NULL, pool->size, prot, &page); | |
352 | else | |
353 | ptr = __alloc_remap_buffer(NULL, pool->size, GFP_KERNEL, prot, | |
354 | &page, NULL); | |
c7909509 | 355 | if (ptr) { |
6b3fe472 HD |
356 | int i; |
357 | ||
358 | for (i = 0; i < nr_pages; i++) | |
359 | pages[i] = page + i; | |
360 | ||
e9da6e99 MS |
361 | spin_lock_init(&pool->lock); |
362 | pool->vaddr = ptr; | |
6b3fe472 | 363 | pool->pages = pages; |
e9da6e99 MS |
364 | pool->bitmap = bitmap; |
365 | pool->nr_pages = nr_pages; | |
366 | pr_info("DMA: preallocated %u KiB pool for atomic coherent allocations\n", | |
367 | (unsigned)pool->size / 1024); | |
c7909509 MS |
368 | return 0; |
369 | } | |
ec10665c SK |
370 | |
371 | kfree(pages); | |
6b3fe472 | 372 | no_pages: |
e9da6e99 MS |
373 | kfree(bitmap); |
374 | no_bitmap: | |
375 | pr_err("DMA: failed to allocate %u KiB pool for atomic coherent allocation\n", | |
376 | (unsigned)pool->size / 1024); | |
c7909509 MS |
377 | return -ENOMEM; |
378 | } | |
379 | /* | |
380 | * CMA is activated by core_initcall, so we must be called after it. | |
381 | */ | |
e9da6e99 | 382 | postcore_initcall(atomic_pool_init); |
c7909509 MS |
383 | |
384 | struct dma_contig_early_reserve { | |
385 | phys_addr_t base; | |
386 | unsigned long size; | |
387 | }; | |
388 | ||
389 | static struct dma_contig_early_reserve dma_mmu_remap[MAX_CMA_AREAS] __initdata; | |
390 | ||
391 | static int dma_mmu_remap_num __initdata; | |
392 | ||
393 | void __init dma_contiguous_early_fixup(phys_addr_t base, unsigned long size) | |
394 | { | |
395 | dma_mmu_remap[dma_mmu_remap_num].base = base; | |
396 | dma_mmu_remap[dma_mmu_remap_num].size = size; | |
397 | dma_mmu_remap_num++; | |
398 | } | |
399 | ||
400 | void __init dma_contiguous_remap(void) | |
401 | { | |
402 | int i; | |
403 | for (i = 0; i < dma_mmu_remap_num; i++) { | |
404 | phys_addr_t start = dma_mmu_remap[i].base; | |
405 | phys_addr_t end = start + dma_mmu_remap[i].size; | |
406 | struct map_desc map; | |
407 | unsigned long addr; | |
408 | ||
409 | if (end > arm_lowmem_limit) | |
410 | end = arm_lowmem_limit; | |
411 | if (start >= end) | |
39f78e70 | 412 | continue; |
c7909509 MS |
413 | |
414 | map.pfn = __phys_to_pfn(start); | |
415 | map.virtual = __phys_to_virt(start); | |
416 | map.length = end - start; | |
417 | map.type = MT_MEMORY_DMA_READY; | |
418 | ||
419 | /* | |
420 | * Clear previous low-memory mapping | |
421 | */ | |
422 | for (addr = __phys_to_virt(start); addr < __phys_to_virt(end); | |
61f6c7a4 | 423 | addr += PMD_SIZE) |
c7909509 MS |
424 | pmd_clear(pmd_off_k(addr)); |
425 | ||
426 | iotable_init(&map, 1); | |
427 | } | |
428 | } | |
429 | ||
c7909509 MS |
430 | static int __dma_update_pte(pte_t *pte, pgtable_t token, unsigned long addr, |
431 | void *data) | |
432 | { | |
433 | struct page *page = virt_to_page(addr); | |
434 | pgprot_t prot = *(pgprot_t *)data; | |
435 | ||
436 | set_pte_ext(pte, mk_pte(page, prot), 0); | |
437 | return 0; | |
438 | } | |
439 | ||
440 | static void __dma_remap(struct page *page, size_t size, pgprot_t prot) | |
441 | { | |
442 | unsigned long start = (unsigned long) page_address(page); | |
443 | unsigned end = start + size; | |
444 | ||
445 | apply_to_page_range(&init_mm, start, size, __dma_update_pte, &prot); | |
446 | dsb(); | |
447 | flush_tlb_kernel_range(start, end); | |
448 | } | |
449 | ||
450 | static void *__alloc_remap_buffer(struct device *dev, size_t size, gfp_t gfp, | |
451 | pgprot_t prot, struct page **ret_page, | |
452 | const void *caller) | |
453 | { | |
454 | struct page *page; | |
455 | void *ptr; | |
456 | page = __dma_alloc_buffer(dev, size, gfp); | |
457 | if (!page) | |
458 | return NULL; | |
459 | ||
460 | ptr = __dma_alloc_remap(page, size, gfp, prot, caller); | |
461 | if (!ptr) { | |
462 | __dma_free_buffer(page, size); | |
463 | return NULL; | |
464 | } | |
465 | ||
466 | *ret_page = page; | |
467 | return ptr; | |
468 | } | |
469 | ||
e9da6e99 | 470 | static void *__alloc_from_pool(size_t size, struct page **ret_page) |
c7909509 | 471 | { |
e9da6e99 MS |
472 | struct dma_pool *pool = &atomic_pool; |
473 | unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; | |
474 | unsigned int pageno; | |
475 | unsigned long flags; | |
476 | void *ptr = NULL; | |
e4ea6918 | 477 | unsigned long align_mask; |
c7909509 | 478 | |
e9da6e99 MS |
479 | if (!pool->vaddr) { |
480 | WARN(1, "coherent pool not initialised!\n"); | |
c7909509 MS |
481 | return NULL; |
482 | } | |
483 | ||
484 | /* | |
485 | * Align the region allocation - allocations from pool are rather | |
486 | * small, so align them to their order in pages, minimum is a page | |
487 | * size. This helps reduce fragmentation of the DMA space. | |
488 | */ | |
e4ea6918 | 489 | align_mask = (1 << get_order(size)) - 1; |
e9da6e99 MS |
490 | |
491 | spin_lock_irqsave(&pool->lock, flags); | |
492 | pageno = bitmap_find_next_zero_area(pool->bitmap, pool->nr_pages, | |
e4ea6918 | 493 | 0, count, align_mask); |
e9da6e99 MS |
494 | if (pageno < pool->nr_pages) { |
495 | bitmap_set(pool->bitmap, pageno, count); | |
496 | ptr = pool->vaddr + PAGE_SIZE * pageno; | |
6b3fe472 | 497 | *ret_page = pool->pages[pageno]; |
fb71285f MS |
498 | } else { |
499 | pr_err_once("ERROR: %u KiB atomic DMA coherent pool is too small!\n" | |
500 | "Please increase it with coherent_pool= kernel parameter!\n", | |
501 | (unsigned)pool->size / 1024); | |
c7909509 | 502 | } |
e9da6e99 MS |
503 | spin_unlock_irqrestore(&pool->lock, flags); |
504 | ||
505 | return ptr; | |
c7909509 MS |
506 | } |
507 | ||
21d0a759 HD |
508 | static bool __in_atomic_pool(void *start, size_t size) |
509 | { | |
510 | struct dma_pool *pool = &atomic_pool; | |
511 | void *end = start + size; | |
512 | void *pool_start = pool->vaddr; | |
513 | void *pool_end = pool->vaddr + pool->size; | |
514 | ||
f3d87524 | 515 | if (start < pool_start || start >= pool_end) |
21d0a759 HD |
516 | return false; |
517 | ||
518 | if (end <= pool_end) | |
519 | return true; | |
520 | ||
521 | WARN(1, "Wrong coherent size(%p-%p) from atomic pool(%p-%p)\n", | |
522 | start, end - 1, pool_start, pool_end - 1); | |
523 | ||
524 | return false; | |
525 | } | |
526 | ||
e9da6e99 | 527 | static int __free_from_pool(void *start, size_t size) |
c7909509 | 528 | { |
e9da6e99 MS |
529 | struct dma_pool *pool = &atomic_pool; |
530 | unsigned long pageno, count; | |
531 | unsigned long flags; | |
c7909509 | 532 | |
21d0a759 | 533 | if (!__in_atomic_pool(start, size)) |
c7909509 MS |
534 | return 0; |
535 | ||
e9da6e99 MS |
536 | pageno = (start - pool->vaddr) >> PAGE_SHIFT; |
537 | count = size >> PAGE_SHIFT; | |
538 | ||
539 | spin_lock_irqsave(&pool->lock, flags); | |
540 | bitmap_clear(pool->bitmap, pageno, count); | |
541 | spin_unlock_irqrestore(&pool->lock, flags); | |
542 | ||
c7909509 MS |
543 | return 1; |
544 | } | |
545 | ||
546 | static void *__alloc_from_contiguous(struct device *dev, size_t size, | |
547 | pgprot_t prot, struct page **ret_page) | |
548 | { | |
549 | unsigned long order = get_order(size); | |
550 | size_t count = size >> PAGE_SHIFT; | |
551 | struct page *page; | |
552 | ||
553 | page = dma_alloc_from_contiguous(dev, count, order); | |
554 | if (!page) | |
555 | return NULL; | |
556 | ||
557 | __dma_clear_buffer(page, size); | |
558 | __dma_remap(page, size, prot); | |
559 | ||
560 | *ret_page = page; | |
561 | return page_address(page); | |
562 | } | |
563 | ||
564 | static void __free_from_contiguous(struct device *dev, struct page *page, | |
565 | size_t size) | |
566 | { | |
567 | __dma_remap(page, size, pgprot_kernel); | |
568 | dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT); | |
569 | } | |
570 | ||
f99d6034 MS |
571 | static inline pgprot_t __get_dma_pgprot(struct dma_attrs *attrs, pgprot_t prot) |
572 | { | |
573 | prot = dma_get_attr(DMA_ATTR_WRITE_COMBINE, attrs) ? | |
574 | pgprot_writecombine(prot) : | |
575 | pgprot_dmacoherent(prot); | |
576 | return prot; | |
577 | } | |
578 | ||
c7909509 MS |
579 | #define nommu() 0 |
580 | ||
ab6494f0 | 581 | #else /* !CONFIG_MMU */ |
695ae0af | 582 | |
c7909509 MS |
583 | #define nommu() 1 |
584 | ||
f99d6034 | 585 | #define __get_dma_pgprot(attrs, prot) __pgprot(0) |
c7909509 | 586 | #define __alloc_remap_buffer(dev, size, gfp, prot, ret, c) NULL |
e9da6e99 | 587 | #define __alloc_from_pool(size, ret_page) NULL |
c7909509 MS |
588 | #define __alloc_from_contiguous(dev, size, prot, ret) NULL |
589 | #define __free_from_pool(cpu_addr, size) 0 | |
590 | #define __free_from_contiguous(dev, page, size) do { } while (0) | |
591 | #define __dma_free_remap(cpu_addr, size) do { } while (0) | |
31ebf944 RK |
592 | |
593 | #endif /* CONFIG_MMU */ | |
594 | ||
c7909509 MS |
595 | static void *__alloc_simple_buffer(struct device *dev, size_t size, gfp_t gfp, |
596 | struct page **ret_page) | |
ab6494f0 | 597 | { |
c7909509 MS |
598 | struct page *page; |
599 | page = __dma_alloc_buffer(dev, size, gfp); | |
600 | if (!page) | |
601 | return NULL; | |
602 | ||
603 | *ret_page = page; | |
604 | return page_address(page); | |
605 | } | |
606 | ||
607 | ||
608 | ||
609 | static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, | |
dd37e940 | 610 | gfp_t gfp, pgprot_t prot, bool is_coherent, const void *caller) |
c7909509 MS |
611 | { |
612 | u64 mask = get_coherent_dma_mask(dev); | |
3dd7ea92 | 613 | struct page *page = NULL; |
31ebf944 | 614 | void *addr; |
ab6494f0 | 615 | |
c7909509 MS |
616 | #ifdef CONFIG_DMA_API_DEBUG |
617 | u64 limit = (mask + 1) & ~mask; | |
618 | if (limit && size >= limit) { | |
619 | dev_warn(dev, "coherent allocation too big (requested %#x mask %#llx)\n", | |
620 | size, mask); | |
621 | return NULL; | |
622 | } | |
623 | #endif | |
624 | ||
625 | if (!mask) | |
626 | return NULL; | |
627 | ||
628 | if (mask < 0xffffffffULL) | |
629 | gfp |= GFP_DMA; | |
630 | ||
ea2e7057 SB |
631 | /* |
632 | * Following is a work-around (a.k.a. hack) to prevent pages | |
633 | * with __GFP_COMP being passed to split_page() which cannot | |
634 | * handle them. The real problem is that this flag probably | |
635 | * should be 0 on ARM as it is not supported on this | |
636 | * platform; see CONFIG_HUGETLBFS. | |
637 | */ | |
638 | gfp &= ~(__GFP_COMP); | |
639 | ||
553ac788 | 640 | *handle = DMA_ERROR_CODE; |
04da5694 | 641 | size = PAGE_ALIGN(size); |
ab6494f0 | 642 | |
dd37e940 | 643 | if (is_coherent || nommu()) |
c7909509 | 644 | addr = __alloc_simple_buffer(dev, size, gfp, &page); |
e9da6e99 MS |
645 | else if (gfp & GFP_ATOMIC) |
646 | addr = __alloc_from_pool(size, &page); | |
f1ae98da | 647 | else if (!IS_ENABLED(CONFIG_CMA)) |
c7909509 | 648 | addr = __alloc_remap_buffer(dev, size, gfp, prot, &page, caller); |
31ebf944 | 649 | else |
c7909509 | 650 | addr = __alloc_from_contiguous(dev, size, prot, &page); |
695ae0af | 651 | |
31ebf944 | 652 | if (addr) |
9eedd963 | 653 | *handle = pfn_to_dma(dev, page_to_pfn(page)); |
695ae0af | 654 | |
31ebf944 RK |
655 | return addr; |
656 | } | |
1da177e4 LT |
657 | |
658 | /* | |
659 | * Allocate DMA-coherent memory space and return both the kernel remapped | |
660 | * virtual and bus address for that space. | |
661 | */ | |
f99d6034 MS |
662 | void *arm_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, |
663 | gfp_t gfp, struct dma_attrs *attrs) | |
1da177e4 | 664 | { |
f99d6034 | 665 | pgprot_t prot = __get_dma_pgprot(attrs, pgprot_kernel); |
1fe53268 DB |
666 | void *memory; |
667 | ||
668 | if (dma_alloc_from_coherent(dev, size, handle, &memory)) | |
669 | return memory; | |
670 | ||
dd37e940 RH |
671 | return __dma_alloc(dev, size, handle, gfp, prot, false, |
672 | __builtin_return_address(0)); | |
673 | } | |
674 | ||
675 | static void *arm_coherent_dma_alloc(struct device *dev, size_t size, | |
676 | dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs) | |
677 | { | |
678 | pgprot_t prot = __get_dma_pgprot(attrs, pgprot_kernel); | |
679 | void *memory; | |
680 | ||
681 | if (dma_alloc_from_coherent(dev, size, handle, &memory)) | |
682 | return memory; | |
683 | ||
684 | return __dma_alloc(dev, size, handle, gfp, prot, true, | |
45cd5290 | 685 | __builtin_return_address(0)); |
1da177e4 | 686 | } |
1da177e4 LT |
687 | |
688 | /* | |
f99d6034 | 689 | * Create userspace mapping for the DMA-coherent memory. |
1da177e4 | 690 | */ |
f99d6034 MS |
691 | int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma, |
692 | void *cpu_addr, dma_addr_t dma_addr, size_t size, | |
693 | struct dma_attrs *attrs) | |
1da177e4 | 694 | { |
ab6494f0 CM |
695 | int ret = -ENXIO; |
696 | #ifdef CONFIG_MMU | |
50262a4b MS |
697 | unsigned long nr_vma_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; |
698 | unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT; | |
c7909509 | 699 | unsigned long pfn = dma_to_pfn(dev, dma_addr); |
50262a4b MS |
700 | unsigned long off = vma->vm_pgoff; |
701 | ||
f99d6034 MS |
702 | vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot); |
703 | ||
47142f07 MS |
704 | if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret)) |
705 | return ret; | |
706 | ||
50262a4b MS |
707 | if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) { |
708 | ret = remap_pfn_range(vma, vma->vm_start, | |
709 | pfn + off, | |
710 | vma->vm_end - vma->vm_start, | |
711 | vma->vm_page_prot); | |
712 | } | |
ab6494f0 | 713 | #endif /* CONFIG_MMU */ |
1da177e4 LT |
714 | |
715 | return ret; | |
716 | } | |
717 | ||
1da177e4 | 718 | /* |
c7909509 | 719 | * Free a buffer as defined by the above mapping. |
1da177e4 | 720 | */ |
dd37e940 RH |
721 | static void __arm_dma_free(struct device *dev, size_t size, void *cpu_addr, |
722 | dma_addr_t handle, struct dma_attrs *attrs, | |
723 | bool is_coherent) | |
1da177e4 | 724 | { |
c7909509 | 725 | struct page *page = pfn_to_page(dma_to_pfn(dev, handle)); |
5edf71ae | 726 | |
1fe53268 DB |
727 | if (dma_release_from_coherent(dev, get_order(size), cpu_addr)) |
728 | return; | |
729 | ||
3e82d012 RK |
730 | size = PAGE_ALIGN(size); |
731 | ||
dd37e940 | 732 | if (is_coherent || nommu()) { |
c7909509 | 733 | __dma_free_buffer(page, size); |
d9e0d149 AK |
734 | } else if (__free_from_pool(cpu_addr, size)) { |
735 | return; | |
f1ae98da | 736 | } else if (!IS_ENABLED(CONFIG_CMA)) { |
695ae0af | 737 | __dma_free_remap(cpu_addr, size); |
c7909509 MS |
738 | __dma_free_buffer(page, size); |
739 | } else { | |
c7909509 MS |
740 | /* |
741 | * Non-atomic allocations cannot be freed with IRQs disabled | |
742 | */ | |
743 | WARN_ON(irqs_disabled()); | |
744 | __free_from_contiguous(dev, page, size); | |
745 | } | |
1da177e4 | 746 | } |
afd1a321 | 747 | |
dd37e940 RH |
748 | void arm_dma_free(struct device *dev, size_t size, void *cpu_addr, |
749 | dma_addr_t handle, struct dma_attrs *attrs) | |
750 | { | |
751 | __arm_dma_free(dev, size, cpu_addr, handle, attrs, false); | |
752 | } | |
753 | ||
754 | static void arm_coherent_dma_free(struct device *dev, size_t size, void *cpu_addr, | |
755 | dma_addr_t handle, struct dma_attrs *attrs) | |
756 | { | |
757 | __arm_dma_free(dev, size, cpu_addr, handle, attrs, true); | |
758 | } | |
759 | ||
dc2832e1 MS |
760 | int arm_dma_get_sgtable(struct device *dev, struct sg_table *sgt, |
761 | void *cpu_addr, dma_addr_t handle, size_t size, | |
762 | struct dma_attrs *attrs) | |
763 | { | |
764 | struct page *page = pfn_to_page(dma_to_pfn(dev, handle)); | |
765 | int ret; | |
766 | ||
767 | ret = sg_alloc_table(sgt, 1, GFP_KERNEL); | |
768 | if (unlikely(ret)) | |
769 | return ret; | |
770 | ||
771 | sg_set_page(sgt->sgl, page, PAGE_ALIGN(size), 0); | |
772 | return 0; | |
773 | } | |
774 | ||
4ea0d737 | 775 | static void dma_cache_maint_page(struct page *page, unsigned long offset, |
a9c9147e RK |
776 | size_t size, enum dma_data_direction dir, |
777 | void (*op)(const void *, size_t, int)) | |
43377453 NP |
778 | { |
779 | /* | |
780 | * A single sg entry may refer to multiple physically contiguous | |
781 | * pages. But we still need to process highmem pages individually. | |
782 | * If highmem is not configured then the bulk of this loop gets | |
783 | * optimized out. | |
784 | */ | |
785 | size_t left = size; | |
786 | do { | |
787 | size_t len = left; | |
93f1d629 RK |
788 | void *vaddr; |
789 | ||
790 | if (PageHighMem(page)) { | |
791 | if (len + offset > PAGE_SIZE) { | |
792 | if (offset >= PAGE_SIZE) { | |
793 | page += offset / PAGE_SIZE; | |
794 | offset %= PAGE_SIZE; | |
795 | } | |
796 | len = PAGE_SIZE - offset; | |
797 | } | |
798 | vaddr = kmap_high_get(page); | |
799 | if (vaddr) { | |
800 | vaddr += offset; | |
a9c9147e | 801 | op(vaddr, len, dir); |
93f1d629 | 802 | kunmap_high(page); |
7e5a69e8 | 803 | } else if (cache_is_vipt()) { |
39af22a7 NP |
804 | /* unmapped pages might still be cached */ |
805 | vaddr = kmap_atomic(page); | |
7e5a69e8 | 806 | op(vaddr + offset, len, dir); |
39af22a7 | 807 | kunmap_atomic(vaddr); |
43377453 | 808 | } |
93f1d629 RK |
809 | } else { |
810 | vaddr = page_address(page) + offset; | |
a9c9147e | 811 | op(vaddr, len, dir); |
43377453 | 812 | } |
43377453 NP |
813 | offset = 0; |
814 | page++; | |
815 | left -= len; | |
816 | } while (left); | |
817 | } | |
4ea0d737 | 818 | |
51fde349 MS |
819 | /* |
820 | * Make an area consistent for devices. | |
821 | * Note: Drivers should NOT use this function directly, as it will break | |
822 | * platforms with CONFIG_DMABOUNCE. | |
823 | * Use the driver DMA support - see dma-mapping.h (dma_sync_*) | |
824 | */ | |
825 | static void __dma_page_cpu_to_dev(struct page *page, unsigned long off, | |
4ea0d737 RK |
826 | size_t size, enum dma_data_direction dir) |
827 | { | |
65af191a | 828 | unsigned long paddr; |
65af191a | 829 | |
a9c9147e | 830 | dma_cache_maint_page(page, off, size, dir, dmac_map_area); |
65af191a RK |
831 | |
832 | paddr = page_to_phys(page) + off; | |
2ffe2da3 RK |
833 | if (dir == DMA_FROM_DEVICE) { |
834 | outer_inv_range(paddr, paddr + size); | |
835 | } else { | |
836 | outer_clean_range(paddr, paddr + size); | |
837 | } | |
838 | /* FIXME: non-speculating: flush on bidirectional mappings? */ | |
4ea0d737 | 839 | } |
4ea0d737 | 840 | |
51fde349 | 841 | static void __dma_page_dev_to_cpu(struct page *page, unsigned long off, |
4ea0d737 RK |
842 | size_t size, enum dma_data_direction dir) |
843 | { | |
2ffe2da3 RK |
844 | unsigned long paddr = page_to_phys(page) + off; |
845 | ||
846 | /* FIXME: non-speculating: not required */ | |
847 | /* don't bother invalidating if DMA to device */ | |
848 | if (dir != DMA_TO_DEVICE) | |
849 | outer_inv_range(paddr, paddr + size); | |
850 | ||
a9c9147e | 851 | dma_cache_maint_page(page, off, size, dir, dmac_unmap_area); |
c0177800 CM |
852 | |
853 | /* | |
854 | * Mark the D-cache clean for this page to avoid extra flushing. | |
855 | */ | |
856 | if (dir != DMA_TO_DEVICE && off == 0 && size >= PAGE_SIZE) | |
857 | set_bit(PG_dcache_clean, &page->flags); | |
4ea0d737 | 858 | } |
43377453 | 859 | |
afd1a321 | 860 | /** |
2a550e73 | 861 | * arm_dma_map_sg - map a set of SG buffers for streaming mode DMA |
afd1a321 RK |
862 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
863 | * @sg: list of buffers | |
864 | * @nents: number of buffers to map | |
865 | * @dir: DMA transfer direction | |
866 | * | |
867 | * Map a set of buffers described by scatterlist in streaming mode for DMA. | |
868 | * This is the scatter-gather version of the dma_map_single interface. | |
869 | * Here the scatter gather list elements are each tagged with the | |
870 | * appropriate dma address and length. They are obtained via | |
871 | * sg_dma_{address,length}. | |
872 | * | |
873 | * Device ownership issues as mentioned for dma_map_single are the same | |
874 | * here. | |
875 | */ | |
2dc6a016 MS |
876 | int arm_dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, |
877 | enum dma_data_direction dir, struct dma_attrs *attrs) | |
afd1a321 | 878 | { |
2a550e73 | 879 | struct dma_map_ops *ops = get_dma_ops(dev); |
afd1a321 | 880 | struct scatterlist *s; |
01135d92 | 881 | int i, j; |
afd1a321 RK |
882 | |
883 | for_each_sg(sg, s, nents, i) { | |
4ce63fcd MS |
884 | #ifdef CONFIG_NEED_SG_DMA_LENGTH |
885 | s->dma_length = s->length; | |
886 | #endif | |
2a550e73 MS |
887 | s->dma_address = ops->map_page(dev, sg_page(s), s->offset, |
888 | s->length, dir, attrs); | |
01135d92 RK |
889 | if (dma_mapping_error(dev, s->dma_address)) |
890 | goto bad_mapping; | |
afd1a321 | 891 | } |
afd1a321 | 892 | return nents; |
01135d92 RK |
893 | |
894 | bad_mapping: | |
895 | for_each_sg(sg, s, i, j) | |
2a550e73 | 896 | ops->unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs); |
01135d92 | 897 | return 0; |
afd1a321 | 898 | } |
afd1a321 RK |
899 | |
900 | /** | |
2a550e73 | 901 | * arm_dma_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg |
afd1a321 RK |
902 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
903 | * @sg: list of buffers | |
0adfca6f | 904 | * @nents: number of buffers to unmap (same as was passed to dma_map_sg) |
afd1a321 RK |
905 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) |
906 | * | |
907 | * Unmap a set of streaming mode DMA translations. Again, CPU access | |
908 | * rules concerning calls here are the same as for dma_unmap_single(). | |
909 | */ | |
2dc6a016 MS |
910 | void arm_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, |
911 | enum dma_data_direction dir, struct dma_attrs *attrs) | |
afd1a321 | 912 | { |
2a550e73 | 913 | struct dma_map_ops *ops = get_dma_ops(dev); |
01135d92 | 914 | struct scatterlist *s; |
01135d92 | 915 | |
01135d92 | 916 | int i; |
24056f52 | 917 | |
01135d92 | 918 | for_each_sg(sg, s, nents, i) |
2a550e73 | 919 | ops->unmap_page(dev, sg_dma_address(s), sg_dma_len(s), dir, attrs); |
afd1a321 | 920 | } |
afd1a321 RK |
921 | |
922 | /** | |
2a550e73 | 923 | * arm_dma_sync_sg_for_cpu |
afd1a321 RK |
924 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
925 | * @sg: list of buffers | |
926 | * @nents: number of buffers to map (returned from dma_map_sg) | |
927 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) | |
928 | */ | |
2dc6a016 | 929 | void arm_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, |
afd1a321 RK |
930 | int nents, enum dma_data_direction dir) |
931 | { | |
2a550e73 | 932 | struct dma_map_ops *ops = get_dma_ops(dev); |
afd1a321 RK |
933 | struct scatterlist *s; |
934 | int i; | |
935 | ||
2a550e73 MS |
936 | for_each_sg(sg, s, nents, i) |
937 | ops->sync_single_for_cpu(dev, sg_dma_address(s), s->length, | |
938 | dir); | |
afd1a321 | 939 | } |
afd1a321 RK |
940 | |
941 | /** | |
2a550e73 | 942 | * arm_dma_sync_sg_for_device |
afd1a321 RK |
943 | * @dev: valid struct device pointer, or NULL for ISA and EISA-like devices |
944 | * @sg: list of buffers | |
945 | * @nents: number of buffers to map (returned from dma_map_sg) | |
946 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) | |
947 | */ | |
2dc6a016 | 948 | void arm_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, |
afd1a321 RK |
949 | int nents, enum dma_data_direction dir) |
950 | { | |
2a550e73 | 951 | struct dma_map_ops *ops = get_dma_ops(dev); |
afd1a321 RK |
952 | struct scatterlist *s; |
953 | int i; | |
954 | ||
2a550e73 MS |
955 | for_each_sg(sg, s, nents, i) |
956 | ops->sync_single_for_device(dev, sg_dma_address(s), s->length, | |
957 | dir); | |
afd1a321 | 958 | } |
24056f52 | 959 | |
022ae537 RK |
960 | /* |
961 | * Return whether the given device DMA address mask can be supported | |
962 | * properly. For example, if your device can only drive the low 24-bits | |
963 | * during bus mastering, then you would pass 0x00ffffff as the mask | |
964 | * to this function. | |
965 | */ | |
966 | int dma_supported(struct device *dev, u64 mask) | |
967 | { | |
968 | if (mask < (u64)arm_dma_limit) | |
969 | return 0; | |
970 | return 1; | |
971 | } | |
972 | EXPORT_SYMBOL(dma_supported); | |
973 | ||
2dc6a016 | 974 | static int arm_dma_set_mask(struct device *dev, u64 dma_mask) |
022ae537 RK |
975 | { |
976 | if (!dev->dma_mask || !dma_supported(dev, dma_mask)) | |
977 | return -EIO; | |
978 | ||
022ae537 | 979 | *dev->dma_mask = dma_mask; |
022ae537 RK |
980 | |
981 | return 0; | |
982 | } | |
022ae537 | 983 | |
24056f52 RK |
984 | #define PREALLOC_DMA_DEBUG_ENTRIES 4096 |
985 | ||
986 | static int __init dma_debug_do_init(void) | |
987 | { | |
988 | dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES); | |
989 | return 0; | |
990 | } | |
991 | fs_initcall(dma_debug_do_init); | |
4ce63fcd MS |
992 | |
993 | #ifdef CONFIG_ARM_DMA_USE_IOMMU | |
994 | ||
995 | /* IOMMU */ | |
996 | ||
997 | static inline dma_addr_t __alloc_iova(struct dma_iommu_mapping *mapping, | |
998 | size_t size) | |
999 | { | |
1000 | unsigned int order = get_order(size); | |
1001 | unsigned int align = 0; | |
1002 | unsigned int count, start; | |
1003 | unsigned long flags; | |
1004 | ||
1005 | count = ((PAGE_ALIGN(size) >> PAGE_SHIFT) + | |
1006 | (1 << mapping->order) - 1) >> mapping->order; | |
1007 | ||
1008 | if (order > mapping->order) | |
1009 | align = (1 << (order - mapping->order)) - 1; | |
1010 | ||
1011 | spin_lock_irqsave(&mapping->lock, flags); | |
1012 | start = bitmap_find_next_zero_area(mapping->bitmap, mapping->bits, 0, | |
1013 | count, align); | |
1014 | if (start > mapping->bits) { | |
1015 | spin_unlock_irqrestore(&mapping->lock, flags); | |
1016 | return DMA_ERROR_CODE; | |
1017 | } | |
1018 | ||
1019 | bitmap_set(mapping->bitmap, start, count); | |
1020 | spin_unlock_irqrestore(&mapping->lock, flags); | |
1021 | ||
1022 | return mapping->base + (start << (mapping->order + PAGE_SHIFT)); | |
1023 | } | |
1024 | ||
1025 | static inline void __free_iova(struct dma_iommu_mapping *mapping, | |
1026 | dma_addr_t addr, size_t size) | |
1027 | { | |
1028 | unsigned int start = (addr - mapping->base) >> | |
1029 | (mapping->order + PAGE_SHIFT); | |
1030 | unsigned int count = ((size >> PAGE_SHIFT) + | |
1031 | (1 << mapping->order) - 1) >> mapping->order; | |
1032 | unsigned long flags; | |
1033 | ||
1034 | spin_lock_irqsave(&mapping->lock, flags); | |
1035 | bitmap_clear(mapping->bitmap, start, count); | |
1036 | spin_unlock_irqrestore(&mapping->lock, flags); | |
1037 | } | |
1038 | ||
1039 | static struct page **__iommu_alloc_buffer(struct device *dev, size_t size, gfp_t gfp) | |
1040 | { | |
1041 | struct page **pages; | |
1042 | int count = size >> PAGE_SHIFT; | |
1043 | int array_size = count * sizeof(struct page *); | |
1044 | int i = 0; | |
1045 | ||
1046 | if (array_size <= PAGE_SIZE) | |
1047 | pages = kzalloc(array_size, gfp); | |
1048 | else | |
1049 | pages = vzalloc(array_size); | |
1050 | if (!pages) | |
1051 | return NULL; | |
1052 | ||
1053 | while (count) { | |
593f4735 | 1054 | int j, order = __fls(count); |
4ce63fcd MS |
1055 | |
1056 | pages[i] = alloc_pages(gfp | __GFP_NOWARN, order); | |
1057 | while (!pages[i] && order) | |
1058 | pages[i] = alloc_pages(gfp | __GFP_NOWARN, --order); | |
1059 | if (!pages[i]) | |
1060 | goto error; | |
1061 | ||
5a796eeb | 1062 | if (order) { |
4ce63fcd | 1063 | split_page(pages[i], order); |
5a796eeb HD |
1064 | j = 1 << order; |
1065 | while (--j) | |
1066 | pages[i + j] = pages[i] + j; | |
1067 | } | |
4ce63fcd MS |
1068 | |
1069 | __dma_clear_buffer(pages[i], PAGE_SIZE << order); | |
1070 | i += 1 << order; | |
1071 | count -= 1 << order; | |
1072 | } | |
1073 | ||
1074 | return pages; | |
1075 | error: | |
9fa8af91 | 1076 | while (i--) |
4ce63fcd MS |
1077 | if (pages[i]) |
1078 | __free_pages(pages[i], 0); | |
46c87852 | 1079 | if (array_size <= PAGE_SIZE) |
4ce63fcd MS |
1080 | kfree(pages); |
1081 | else | |
1082 | vfree(pages); | |
1083 | return NULL; | |
1084 | } | |
1085 | ||
1086 | static int __iommu_free_buffer(struct device *dev, struct page **pages, size_t size) | |
1087 | { | |
1088 | int count = size >> PAGE_SHIFT; | |
1089 | int array_size = count * sizeof(struct page *); | |
1090 | int i; | |
1091 | for (i = 0; i < count; i++) | |
1092 | if (pages[i]) | |
1093 | __free_pages(pages[i], 0); | |
46c87852 | 1094 | if (array_size <= PAGE_SIZE) |
4ce63fcd MS |
1095 | kfree(pages); |
1096 | else | |
1097 | vfree(pages); | |
1098 | return 0; | |
1099 | } | |
1100 | ||
1101 | /* | |
1102 | * Create a CPU mapping for a specified pages | |
1103 | */ | |
1104 | static void * | |
e9da6e99 MS |
1105 | __iommu_alloc_remap(struct page **pages, size_t size, gfp_t gfp, pgprot_t prot, |
1106 | const void *caller) | |
4ce63fcd | 1107 | { |
e9da6e99 MS |
1108 | unsigned int i, nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT; |
1109 | struct vm_struct *area; | |
1110 | unsigned long p; | |
4ce63fcd | 1111 | |
e9da6e99 MS |
1112 | area = get_vm_area_caller(size, VM_ARM_DMA_CONSISTENT | VM_USERMAP, |
1113 | caller); | |
1114 | if (!area) | |
4ce63fcd | 1115 | return NULL; |
4ce63fcd | 1116 | |
e9da6e99 MS |
1117 | area->pages = pages; |
1118 | area->nr_pages = nr_pages; | |
1119 | p = (unsigned long)area->addr; | |
4ce63fcd | 1120 | |
e9da6e99 MS |
1121 | for (i = 0; i < nr_pages; i++) { |
1122 | phys_addr_t phys = __pfn_to_phys(page_to_pfn(pages[i])); | |
1123 | if (ioremap_page_range(p, p + PAGE_SIZE, phys, prot)) | |
1124 | goto err; | |
1125 | p += PAGE_SIZE; | |
4ce63fcd | 1126 | } |
e9da6e99 MS |
1127 | return area->addr; |
1128 | err: | |
1129 | unmap_kernel_range((unsigned long)area->addr, size); | |
1130 | vunmap(area->addr); | |
4ce63fcd MS |
1131 | return NULL; |
1132 | } | |
1133 | ||
1134 | /* | |
1135 | * Create a mapping in device IO address space for specified pages | |
1136 | */ | |
1137 | static dma_addr_t | |
1138 | __iommu_create_mapping(struct device *dev, struct page **pages, size_t size) | |
1139 | { | |
1140 | struct dma_iommu_mapping *mapping = dev->archdata.mapping; | |
1141 | unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; | |
1142 | dma_addr_t dma_addr, iova; | |
1143 | int i, ret = DMA_ERROR_CODE; | |
1144 | ||
1145 | dma_addr = __alloc_iova(mapping, size); | |
1146 | if (dma_addr == DMA_ERROR_CODE) | |
1147 | return dma_addr; | |
1148 | ||
1149 | iova = dma_addr; | |
1150 | for (i = 0; i < count; ) { | |
1151 | unsigned int next_pfn = page_to_pfn(pages[i]) + 1; | |
1152 | phys_addr_t phys = page_to_phys(pages[i]); | |
1153 | unsigned int len, j; | |
1154 | ||
1155 | for (j = i + 1; j < count; j++, next_pfn++) | |
1156 | if (page_to_pfn(pages[j]) != next_pfn) | |
1157 | break; | |
1158 | ||
1159 | len = (j - i) << PAGE_SHIFT; | |
1160 | ret = iommu_map(mapping->domain, iova, phys, len, 0); | |
1161 | if (ret < 0) | |
1162 | goto fail; | |
1163 | iova += len; | |
1164 | i = j; | |
1165 | } | |
1166 | return dma_addr; | |
1167 | fail: | |
1168 | iommu_unmap(mapping->domain, dma_addr, iova-dma_addr); | |
1169 | __free_iova(mapping, dma_addr, size); | |
1170 | return DMA_ERROR_CODE; | |
1171 | } | |
1172 | ||
1173 | static int __iommu_remove_mapping(struct device *dev, dma_addr_t iova, size_t size) | |
1174 | { | |
1175 | struct dma_iommu_mapping *mapping = dev->archdata.mapping; | |
1176 | ||
1177 | /* | |
1178 | * add optional in-page offset from iova to size and align | |
1179 | * result to page size | |
1180 | */ | |
1181 | size = PAGE_ALIGN((iova & ~PAGE_MASK) + size); | |
1182 | iova &= PAGE_MASK; | |
1183 | ||
1184 | iommu_unmap(mapping->domain, iova, size); | |
1185 | __free_iova(mapping, iova, size); | |
1186 | return 0; | |
1187 | } | |
1188 | ||
665bad7b HD |
1189 | static struct page **__atomic_get_pages(void *addr) |
1190 | { | |
1191 | struct dma_pool *pool = &atomic_pool; | |
1192 | struct page **pages = pool->pages; | |
1193 | int offs = (addr - pool->vaddr) >> PAGE_SHIFT; | |
1194 | ||
1195 | return pages + offs; | |
1196 | } | |
1197 | ||
955c757e | 1198 | static struct page **__iommu_get_pages(void *cpu_addr, struct dma_attrs *attrs) |
e9da6e99 MS |
1199 | { |
1200 | struct vm_struct *area; | |
1201 | ||
665bad7b HD |
1202 | if (__in_atomic_pool(cpu_addr, PAGE_SIZE)) |
1203 | return __atomic_get_pages(cpu_addr); | |
1204 | ||
955c757e MS |
1205 | if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs)) |
1206 | return cpu_addr; | |
1207 | ||
e9da6e99 MS |
1208 | area = find_vm_area(cpu_addr); |
1209 | if (area && (area->flags & VM_ARM_DMA_CONSISTENT)) | |
1210 | return area->pages; | |
1211 | return NULL; | |
1212 | } | |
1213 | ||
479ed93a HD |
1214 | static void *__iommu_alloc_atomic(struct device *dev, size_t size, |
1215 | dma_addr_t *handle) | |
1216 | { | |
1217 | struct page *page; | |
1218 | void *addr; | |
1219 | ||
1220 | addr = __alloc_from_pool(size, &page); | |
1221 | if (!addr) | |
1222 | return NULL; | |
1223 | ||
1224 | *handle = __iommu_create_mapping(dev, &page, size); | |
1225 | if (*handle == DMA_ERROR_CODE) | |
1226 | goto err_mapping; | |
1227 | ||
1228 | return addr; | |
1229 | ||
1230 | err_mapping: | |
1231 | __free_from_pool(addr, size); | |
1232 | return NULL; | |
1233 | } | |
1234 | ||
1235 | static void __iommu_free_atomic(struct device *dev, struct page **pages, | |
1236 | dma_addr_t handle, size_t size) | |
1237 | { | |
1238 | __iommu_remove_mapping(dev, handle, size); | |
1239 | __free_from_pool(page_address(pages[0]), size); | |
1240 | } | |
1241 | ||
4ce63fcd MS |
1242 | static void *arm_iommu_alloc_attrs(struct device *dev, size_t size, |
1243 | dma_addr_t *handle, gfp_t gfp, struct dma_attrs *attrs) | |
1244 | { | |
1245 | pgprot_t prot = __get_dma_pgprot(attrs, pgprot_kernel); | |
1246 | struct page **pages; | |
1247 | void *addr = NULL; | |
1248 | ||
1249 | *handle = DMA_ERROR_CODE; | |
1250 | size = PAGE_ALIGN(size); | |
1251 | ||
479ed93a HD |
1252 | if (gfp & GFP_ATOMIC) |
1253 | return __iommu_alloc_atomic(dev, size, handle); | |
1254 | ||
4ce63fcd MS |
1255 | pages = __iommu_alloc_buffer(dev, size, gfp); |
1256 | if (!pages) | |
1257 | return NULL; | |
1258 | ||
1259 | *handle = __iommu_create_mapping(dev, pages, size); | |
1260 | if (*handle == DMA_ERROR_CODE) | |
1261 | goto err_buffer; | |
1262 | ||
955c757e MS |
1263 | if (dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs)) |
1264 | return pages; | |
1265 | ||
e9da6e99 MS |
1266 | addr = __iommu_alloc_remap(pages, size, gfp, prot, |
1267 | __builtin_return_address(0)); | |
4ce63fcd MS |
1268 | if (!addr) |
1269 | goto err_mapping; | |
1270 | ||
1271 | return addr; | |
1272 | ||
1273 | err_mapping: | |
1274 | __iommu_remove_mapping(dev, *handle, size); | |
1275 | err_buffer: | |
1276 | __iommu_free_buffer(dev, pages, size); | |
1277 | return NULL; | |
1278 | } | |
1279 | ||
1280 | static int arm_iommu_mmap_attrs(struct device *dev, struct vm_area_struct *vma, | |
1281 | void *cpu_addr, dma_addr_t dma_addr, size_t size, | |
1282 | struct dma_attrs *attrs) | |
1283 | { | |
e9da6e99 MS |
1284 | unsigned long uaddr = vma->vm_start; |
1285 | unsigned long usize = vma->vm_end - vma->vm_start; | |
955c757e | 1286 | struct page **pages = __iommu_get_pages(cpu_addr, attrs); |
4ce63fcd MS |
1287 | |
1288 | vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot); | |
4ce63fcd | 1289 | |
e9da6e99 MS |
1290 | if (!pages) |
1291 | return -ENXIO; | |
4ce63fcd | 1292 | |
e9da6e99 MS |
1293 | do { |
1294 | int ret = vm_insert_page(vma, uaddr, *pages++); | |
1295 | if (ret) { | |
1296 | pr_err("Remapping memory failed: %d\n", ret); | |
1297 | return ret; | |
1298 | } | |
1299 | uaddr += PAGE_SIZE; | |
1300 | usize -= PAGE_SIZE; | |
1301 | } while (usize > 0); | |
4ce63fcd | 1302 | |
4ce63fcd MS |
1303 | return 0; |
1304 | } | |
1305 | ||
1306 | /* | |
1307 | * free a page as defined by the above mapping. | |
1308 | * Must not be called with IRQs disabled. | |
1309 | */ | |
1310 | void arm_iommu_free_attrs(struct device *dev, size_t size, void *cpu_addr, | |
1311 | dma_addr_t handle, struct dma_attrs *attrs) | |
1312 | { | |
955c757e | 1313 | struct page **pages = __iommu_get_pages(cpu_addr, attrs); |
4ce63fcd MS |
1314 | size = PAGE_ALIGN(size); |
1315 | ||
e9da6e99 MS |
1316 | if (!pages) { |
1317 | WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr); | |
1318 | return; | |
4ce63fcd | 1319 | } |
e9da6e99 | 1320 | |
479ed93a HD |
1321 | if (__in_atomic_pool(cpu_addr, size)) { |
1322 | __iommu_free_atomic(dev, pages, handle, size); | |
1323 | return; | |
1324 | } | |
1325 | ||
955c757e MS |
1326 | if (!dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs)) { |
1327 | unmap_kernel_range((unsigned long)cpu_addr, size); | |
1328 | vunmap(cpu_addr); | |
1329 | } | |
e9da6e99 MS |
1330 | |
1331 | __iommu_remove_mapping(dev, handle, size); | |
1332 | __iommu_free_buffer(dev, pages, size); | |
4ce63fcd MS |
1333 | } |
1334 | ||
dc2832e1 MS |
1335 | static int arm_iommu_get_sgtable(struct device *dev, struct sg_table *sgt, |
1336 | void *cpu_addr, dma_addr_t dma_addr, | |
1337 | size_t size, struct dma_attrs *attrs) | |
1338 | { | |
1339 | unsigned int count = PAGE_ALIGN(size) >> PAGE_SHIFT; | |
1340 | struct page **pages = __iommu_get_pages(cpu_addr, attrs); | |
1341 | ||
1342 | if (!pages) | |
1343 | return -ENXIO; | |
1344 | ||
1345 | return sg_alloc_table_from_pages(sgt, pages, count, 0, size, | |
1346 | GFP_KERNEL); | |
4ce63fcd MS |
1347 | } |
1348 | ||
1349 | /* | |
1350 | * Map a part of the scatter-gather list into contiguous io address space | |
1351 | */ | |
1352 | static int __map_sg_chunk(struct device *dev, struct scatterlist *sg, | |
1353 | size_t size, dma_addr_t *handle, | |
0fa478df RH |
1354 | enum dma_data_direction dir, struct dma_attrs *attrs, |
1355 | bool is_coherent) | |
4ce63fcd MS |
1356 | { |
1357 | struct dma_iommu_mapping *mapping = dev->archdata.mapping; | |
1358 | dma_addr_t iova, iova_base; | |
1359 | int ret = 0; | |
1360 | unsigned int count; | |
1361 | struct scatterlist *s; | |
1362 | ||
1363 | size = PAGE_ALIGN(size); | |
1364 | *handle = DMA_ERROR_CODE; | |
1365 | ||
1366 | iova_base = iova = __alloc_iova(mapping, size); | |
1367 | if (iova == DMA_ERROR_CODE) | |
1368 | return -ENOMEM; | |
1369 | ||
1370 | for (count = 0, s = sg; count < (size >> PAGE_SHIFT); s = sg_next(s)) { | |
1371 | phys_addr_t phys = page_to_phys(sg_page(s)); | |
1372 | unsigned int len = PAGE_ALIGN(s->offset + s->length); | |
1373 | ||
0fa478df RH |
1374 | if (!is_coherent && |
1375 | !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) | |
4ce63fcd MS |
1376 | __dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, dir); |
1377 | ||
1378 | ret = iommu_map(mapping->domain, iova, phys, len, 0); | |
1379 | if (ret < 0) | |
1380 | goto fail; | |
1381 | count += len >> PAGE_SHIFT; | |
1382 | iova += len; | |
1383 | } | |
1384 | *handle = iova_base; | |
1385 | ||
1386 | return 0; | |
1387 | fail: | |
1388 | iommu_unmap(mapping->domain, iova_base, count * PAGE_SIZE); | |
1389 | __free_iova(mapping, iova_base, size); | |
1390 | return ret; | |
1391 | } | |
1392 | ||
0fa478df RH |
1393 | static int __iommu_map_sg(struct device *dev, struct scatterlist *sg, int nents, |
1394 | enum dma_data_direction dir, struct dma_attrs *attrs, | |
1395 | bool is_coherent) | |
4ce63fcd MS |
1396 | { |
1397 | struct scatterlist *s = sg, *dma = sg, *start = sg; | |
1398 | int i, count = 0; | |
1399 | unsigned int offset = s->offset; | |
1400 | unsigned int size = s->offset + s->length; | |
1401 | unsigned int max = dma_get_max_seg_size(dev); | |
1402 | ||
1403 | for (i = 1; i < nents; i++) { | |
1404 | s = sg_next(s); | |
1405 | ||
1406 | s->dma_address = DMA_ERROR_CODE; | |
1407 | s->dma_length = 0; | |
1408 | ||
1409 | if (s->offset || (size & ~PAGE_MASK) || size + s->length > max) { | |
1410 | if (__map_sg_chunk(dev, start, size, &dma->dma_address, | |
0fa478df | 1411 | dir, attrs, is_coherent) < 0) |
4ce63fcd MS |
1412 | goto bad_mapping; |
1413 | ||
1414 | dma->dma_address += offset; | |
1415 | dma->dma_length = size - offset; | |
1416 | ||
1417 | size = offset = s->offset; | |
1418 | start = s; | |
1419 | dma = sg_next(dma); | |
1420 | count += 1; | |
1421 | } | |
1422 | size += s->length; | |
1423 | } | |
0fa478df RH |
1424 | if (__map_sg_chunk(dev, start, size, &dma->dma_address, dir, attrs, |
1425 | is_coherent) < 0) | |
4ce63fcd MS |
1426 | goto bad_mapping; |
1427 | ||
1428 | dma->dma_address += offset; | |
1429 | dma->dma_length = size - offset; | |
1430 | ||
1431 | return count+1; | |
1432 | ||
1433 | bad_mapping: | |
1434 | for_each_sg(sg, s, count, i) | |
1435 | __iommu_remove_mapping(dev, sg_dma_address(s), sg_dma_len(s)); | |
1436 | return 0; | |
1437 | } | |
1438 | ||
1439 | /** | |
0fa478df | 1440 | * arm_coherent_iommu_map_sg - map a set of SG buffers for streaming mode DMA |
4ce63fcd MS |
1441 | * @dev: valid struct device pointer |
1442 | * @sg: list of buffers | |
0fa478df RH |
1443 | * @nents: number of buffers to map |
1444 | * @dir: DMA transfer direction | |
4ce63fcd | 1445 | * |
0fa478df RH |
1446 | * Map a set of i/o coherent buffers described by scatterlist in streaming |
1447 | * mode for DMA. The scatter gather list elements are merged together (if | |
1448 | * possible) and tagged with the appropriate dma address and length. They are | |
1449 | * obtained via sg_dma_{address,length}. | |
4ce63fcd | 1450 | */ |
0fa478df RH |
1451 | int arm_coherent_iommu_map_sg(struct device *dev, struct scatterlist *sg, |
1452 | int nents, enum dma_data_direction dir, struct dma_attrs *attrs) | |
1453 | { | |
1454 | return __iommu_map_sg(dev, sg, nents, dir, attrs, true); | |
1455 | } | |
1456 | ||
1457 | /** | |
1458 | * arm_iommu_map_sg - map a set of SG buffers for streaming mode DMA | |
1459 | * @dev: valid struct device pointer | |
1460 | * @sg: list of buffers | |
1461 | * @nents: number of buffers to map | |
1462 | * @dir: DMA transfer direction | |
1463 | * | |
1464 | * Map a set of buffers described by scatterlist in streaming mode for DMA. | |
1465 | * The scatter gather list elements are merged together (if possible) and | |
1466 | * tagged with the appropriate dma address and length. They are obtained via | |
1467 | * sg_dma_{address,length}. | |
1468 | */ | |
1469 | int arm_iommu_map_sg(struct device *dev, struct scatterlist *sg, | |
1470 | int nents, enum dma_data_direction dir, struct dma_attrs *attrs) | |
1471 | { | |
1472 | return __iommu_map_sg(dev, sg, nents, dir, attrs, false); | |
1473 | } | |
1474 | ||
1475 | static void __iommu_unmap_sg(struct device *dev, struct scatterlist *sg, | |
1476 | int nents, enum dma_data_direction dir, struct dma_attrs *attrs, | |
1477 | bool is_coherent) | |
4ce63fcd MS |
1478 | { |
1479 | struct scatterlist *s; | |
1480 | int i; | |
1481 | ||
1482 | for_each_sg(sg, s, nents, i) { | |
1483 | if (sg_dma_len(s)) | |
1484 | __iommu_remove_mapping(dev, sg_dma_address(s), | |
1485 | sg_dma_len(s)); | |
0fa478df | 1486 | if (!is_coherent && |
97ef952a | 1487 | !dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) |
4ce63fcd MS |
1488 | __dma_page_dev_to_cpu(sg_page(s), s->offset, |
1489 | s->length, dir); | |
1490 | } | |
1491 | } | |
1492 | ||
0fa478df RH |
1493 | /** |
1494 | * arm_coherent_iommu_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg | |
1495 | * @dev: valid struct device pointer | |
1496 | * @sg: list of buffers | |
1497 | * @nents: number of buffers to unmap (same as was passed to dma_map_sg) | |
1498 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) | |
1499 | * | |
1500 | * Unmap a set of streaming mode DMA translations. Again, CPU access | |
1501 | * rules concerning calls here are the same as for dma_unmap_single(). | |
1502 | */ | |
1503 | void arm_coherent_iommu_unmap_sg(struct device *dev, struct scatterlist *sg, | |
1504 | int nents, enum dma_data_direction dir, struct dma_attrs *attrs) | |
1505 | { | |
1506 | __iommu_unmap_sg(dev, sg, nents, dir, attrs, true); | |
1507 | } | |
1508 | ||
1509 | /** | |
1510 | * arm_iommu_unmap_sg - unmap a set of SG buffers mapped by dma_map_sg | |
1511 | * @dev: valid struct device pointer | |
1512 | * @sg: list of buffers | |
1513 | * @nents: number of buffers to unmap (same as was passed to dma_map_sg) | |
1514 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) | |
1515 | * | |
1516 | * Unmap a set of streaming mode DMA translations. Again, CPU access | |
1517 | * rules concerning calls here are the same as for dma_unmap_single(). | |
1518 | */ | |
1519 | void arm_iommu_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, | |
1520 | enum dma_data_direction dir, struct dma_attrs *attrs) | |
1521 | { | |
1522 | __iommu_unmap_sg(dev, sg, nents, dir, attrs, false); | |
1523 | } | |
1524 | ||
4ce63fcd MS |
1525 | /** |
1526 | * arm_iommu_sync_sg_for_cpu | |
1527 | * @dev: valid struct device pointer | |
1528 | * @sg: list of buffers | |
1529 | * @nents: number of buffers to map (returned from dma_map_sg) | |
1530 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) | |
1531 | */ | |
1532 | void arm_iommu_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, | |
1533 | int nents, enum dma_data_direction dir) | |
1534 | { | |
1535 | struct scatterlist *s; | |
1536 | int i; | |
1537 | ||
1538 | for_each_sg(sg, s, nents, i) | |
0fa478df | 1539 | __dma_page_dev_to_cpu(sg_page(s), s->offset, s->length, dir); |
4ce63fcd MS |
1540 | |
1541 | } | |
1542 | ||
1543 | /** | |
1544 | * arm_iommu_sync_sg_for_device | |
1545 | * @dev: valid struct device pointer | |
1546 | * @sg: list of buffers | |
1547 | * @nents: number of buffers to map (returned from dma_map_sg) | |
1548 | * @dir: DMA transfer direction (same as was passed to dma_map_sg) | |
1549 | */ | |
1550 | void arm_iommu_sync_sg_for_device(struct device *dev, struct scatterlist *sg, | |
1551 | int nents, enum dma_data_direction dir) | |
1552 | { | |
1553 | struct scatterlist *s; | |
1554 | int i; | |
1555 | ||
1556 | for_each_sg(sg, s, nents, i) | |
0fa478df | 1557 | __dma_page_cpu_to_dev(sg_page(s), s->offset, s->length, dir); |
4ce63fcd MS |
1558 | } |
1559 | ||
1560 | ||
1561 | /** | |
0fa478df | 1562 | * arm_coherent_iommu_map_page |
4ce63fcd MS |
1563 | * @dev: valid struct device pointer |
1564 | * @page: page that buffer resides in | |
1565 | * @offset: offset into page for start of buffer | |
1566 | * @size: size of buffer to map | |
1567 | * @dir: DMA transfer direction | |
1568 | * | |
0fa478df | 1569 | * Coherent IOMMU aware version of arm_dma_map_page() |
4ce63fcd | 1570 | */ |
0fa478df | 1571 | static dma_addr_t arm_coherent_iommu_map_page(struct device *dev, struct page *page, |
4ce63fcd MS |
1572 | unsigned long offset, size_t size, enum dma_data_direction dir, |
1573 | struct dma_attrs *attrs) | |
1574 | { | |
1575 | struct dma_iommu_mapping *mapping = dev->archdata.mapping; | |
1576 | dma_addr_t dma_addr; | |
1577 | int ret, len = PAGE_ALIGN(size + offset); | |
1578 | ||
4ce63fcd MS |
1579 | dma_addr = __alloc_iova(mapping, len); |
1580 | if (dma_addr == DMA_ERROR_CODE) | |
1581 | return dma_addr; | |
1582 | ||
1583 | ret = iommu_map(mapping->domain, dma_addr, page_to_phys(page), len, 0); | |
1584 | if (ret < 0) | |
1585 | goto fail; | |
1586 | ||
1587 | return dma_addr + offset; | |
1588 | fail: | |
1589 | __free_iova(mapping, dma_addr, len); | |
1590 | return DMA_ERROR_CODE; | |
1591 | } | |
1592 | ||
0fa478df RH |
1593 | /** |
1594 | * arm_iommu_map_page | |
1595 | * @dev: valid struct device pointer | |
1596 | * @page: page that buffer resides in | |
1597 | * @offset: offset into page for start of buffer | |
1598 | * @size: size of buffer to map | |
1599 | * @dir: DMA transfer direction | |
1600 | * | |
1601 | * IOMMU aware version of arm_dma_map_page() | |
1602 | */ | |
1603 | static dma_addr_t arm_iommu_map_page(struct device *dev, struct page *page, | |
1604 | unsigned long offset, size_t size, enum dma_data_direction dir, | |
1605 | struct dma_attrs *attrs) | |
1606 | { | |
1607 | if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) | |
1608 | __dma_page_cpu_to_dev(page, offset, size, dir); | |
1609 | ||
1610 | return arm_coherent_iommu_map_page(dev, page, offset, size, dir, attrs); | |
1611 | } | |
1612 | ||
1613 | /** | |
1614 | * arm_coherent_iommu_unmap_page | |
1615 | * @dev: valid struct device pointer | |
1616 | * @handle: DMA address of buffer | |
1617 | * @size: size of buffer (same as passed to dma_map_page) | |
1618 | * @dir: DMA transfer direction (same as passed to dma_map_page) | |
1619 | * | |
1620 | * Coherent IOMMU aware version of arm_dma_unmap_page() | |
1621 | */ | |
1622 | static void arm_coherent_iommu_unmap_page(struct device *dev, dma_addr_t handle, | |
1623 | size_t size, enum dma_data_direction dir, | |
1624 | struct dma_attrs *attrs) | |
1625 | { | |
1626 | struct dma_iommu_mapping *mapping = dev->archdata.mapping; | |
1627 | dma_addr_t iova = handle & PAGE_MASK; | |
0fa478df RH |
1628 | int offset = handle & ~PAGE_MASK; |
1629 | int len = PAGE_ALIGN(size + offset); | |
1630 | ||
1631 | if (!iova) | |
1632 | return; | |
1633 | ||
1634 | iommu_unmap(mapping->domain, iova, len); | |
1635 | __free_iova(mapping, iova, len); | |
1636 | } | |
1637 | ||
4ce63fcd MS |
1638 | /** |
1639 | * arm_iommu_unmap_page | |
1640 | * @dev: valid struct device pointer | |
1641 | * @handle: DMA address of buffer | |
1642 | * @size: size of buffer (same as passed to dma_map_page) | |
1643 | * @dir: DMA transfer direction (same as passed to dma_map_page) | |
1644 | * | |
1645 | * IOMMU aware version of arm_dma_unmap_page() | |
1646 | */ | |
1647 | static void arm_iommu_unmap_page(struct device *dev, dma_addr_t handle, | |
1648 | size_t size, enum dma_data_direction dir, | |
1649 | struct dma_attrs *attrs) | |
1650 | { | |
1651 | struct dma_iommu_mapping *mapping = dev->archdata.mapping; | |
1652 | dma_addr_t iova = handle & PAGE_MASK; | |
1653 | struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova)); | |
1654 | int offset = handle & ~PAGE_MASK; | |
1655 | int len = PAGE_ALIGN(size + offset); | |
1656 | ||
1657 | if (!iova) | |
1658 | return; | |
1659 | ||
0fa478df | 1660 | if (!dma_get_attr(DMA_ATTR_SKIP_CPU_SYNC, attrs)) |
4ce63fcd MS |
1661 | __dma_page_dev_to_cpu(page, offset, size, dir); |
1662 | ||
1663 | iommu_unmap(mapping->domain, iova, len); | |
1664 | __free_iova(mapping, iova, len); | |
1665 | } | |
1666 | ||
1667 | static void arm_iommu_sync_single_for_cpu(struct device *dev, | |
1668 | dma_addr_t handle, size_t size, enum dma_data_direction dir) | |
1669 | { | |
1670 | struct dma_iommu_mapping *mapping = dev->archdata.mapping; | |
1671 | dma_addr_t iova = handle & PAGE_MASK; | |
1672 | struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova)); | |
1673 | unsigned int offset = handle & ~PAGE_MASK; | |
1674 | ||
1675 | if (!iova) | |
1676 | return; | |
1677 | ||
0fa478df | 1678 | __dma_page_dev_to_cpu(page, offset, size, dir); |
4ce63fcd MS |
1679 | } |
1680 | ||
1681 | static void arm_iommu_sync_single_for_device(struct device *dev, | |
1682 | dma_addr_t handle, size_t size, enum dma_data_direction dir) | |
1683 | { | |
1684 | struct dma_iommu_mapping *mapping = dev->archdata.mapping; | |
1685 | dma_addr_t iova = handle & PAGE_MASK; | |
1686 | struct page *page = phys_to_page(iommu_iova_to_phys(mapping->domain, iova)); | |
1687 | unsigned int offset = handle & ~PAGE_MASK; | |
1688 | ||
1689 | if (!iova) | |
1690 | return; | |
1691 | ||
1692 | __dma_page_cpu_to_dev(page, offset, size, dir); | |
1693 | } | |
1694 | ||
1695 | struct dma_map_ops iommu_ops = { | |
1696 | .alloc = arm_iommu_alloc_attrs, | |
1697 | .free = arm_iommu_free_attrs, | |
1698 | .mmap = arm_iommu_mmap_attrs, | |
dc2832e1 | 1699 | .get_sgtable = arm_iommu_get_sgtable, |
4ce63fcd MS |
1700 | |
1701 | .map_page = arm_iommu_map_page, | |
1702 | .unmap_page = arm_iommu_unmap_page, | |
1703 | .sync_single_for_cpu = arm_iommu_sync_single_for_cpu, | |
1704 | .sync_single_for_device = arm_iommu_sync_single_for_device, | |
1705 | ||
1706 | .map_sg = arm_iommu_map_sg, | |
1707 | .unmap_sg = arm_iommu_unmap_sg, | |
1708 | .sync_sg_for_cpu = arm_iommu_sync_sg_for_cpu, | |
1709 | .sync_sg_for_device = arm_iommu_sync_sg_for_device, | |
1710 | }; | |
1711 | ||
0fa478df RH |
1712 | struct dma_map_ops iommu_coherent_ops = { |
1713 | .alloc = arm_iommu_alloc_attrs, | |
1714 | .free = arm_iommu_free_attrs, | |
1715 | .mmap = arm_iommu_mmap_attrs, | |
1716 | .get_sgtable = arm_iommu_get_sgtable, | |
1717 | ||
1718 | .map_page = arm_coherent_iommu_map_page, | |
1719 | .unmap_page = arm_coherent_iommu_unmap_page, | |
1720 | ||
1721 | .map_sg = arm_coherent_iommu_map_sg, | |
1722 | .unmap_sg = arm_coherent_iommu_unmap_sg, | |
1723 | }; | |
1724 | ||
4ce63fcd MS |
1725 | /** |
1726 | * arm_iommu_create_mapping | |
1727 | * @bus: pointer to the bus holding the client device (for IOMMU calls) | |
1728 | * @base: start address of the valid IO address space | |
1729 | * @size: size of the valid IO address space | |
1730 | * @order: accuracy of the IO addresses allocations | |
1731 | * | |
1732 | * Creates a mapping structure which holds information about used/unused | |
1733 | * IO address ranges, which is required to perform memory allocation and | |
1734 | * mapping with IOMMU aware functions. | |
1735 | * | |
1736 | * The client device need to be attached to the mapping with | |
1737 | * arm_iommu_attach_device function. | |
1738 | */ | |
1739 | struct dma_iommu_mapping * | |
1740 | arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, size_t size, | |
1741 | int order) | |
1742 | { | |
1743 | unsigned int count = size >> (PAGE_SHIFT + order); | |
1744 | unsigned int bitmap_size = BITS_TO_LONGS(count) * sizeof(long); | |
1745 | struct dma_iommu_mapping *mapping; | |
1746 | int err = -ENOMEM; | |
1747 | ||
1748 | if (!count) | |
1749 | return ERR_PTR(-EINVAL); | |
1750 | ||
1751 | mapping = kzalloc(sizeof(struct dma_iommu_mapping), GFP_KERNEL); | |
1752 | if (!mapping) | |
1753 | goto err; | |
1754 | ||
1755 | mapping->bitmap = kzalloc(bitmap_size, GFP_KERNEL); | |
1756 | if (!mapping->bitmap) | |
1757 | goto err2; | |
1758 | ||
1759 | mapping->base = base; | |
1760 | mapping->bits = BITS_PER_BYTE * bitmap_size; | |
1761 | mapping->order = order; | |
1762 | spin_lock_init(&mapping->lock); | |
1763 | ||
1764 | mapping->domain = iommu_domain_alloc(bus); | |
1765 | if (!mapping->domain) | |
1766 | goto err3; | |
1767 | ||
1768 | kref_init(&mapping->kref); | |
1769 | return mapping; | |
1770 | err3: | |
1771 | kfree(mapping->bitmap); | |
1772 | err2: | |
1773 | kfree(mapping); | |
1774 | err: | |
1775 | return ERR_PTR(err); | |
1776 | } | |
1777 | ||
1778 | static void release_iommu_mapping(struct kref *kref) | |
1779 | { | |
1780 | struct dma_iommu_mapping *mapping = | |
1781 | container_of(kref, struct dma_iommu_mapping, kref); | |
1782 | ||
1783 | iommu_domain_free(mapping->domain); | |
1784 | kfree(mapping->bitmap); | |
1785 | kfree(mapping); | |
1786 | } | |
1787 | ||
1788 | void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping) | |
1789 | { | |
1790 | if (mapping) | |
1791 | kref_put(&mapping->kref, release_iommu_mapping); | |
1792 | } | |
1793 | ||
1794 | /** | |
1795 | * arm_iommu_attach_device | |
1796 | * @dev: valid struct device pointer | |
1797 | * @mapping: io address space mapping structure (returned from | |
1798 | * arm_iommu_create_mapping) | |
1799 | * | |
1800 | * Attaches specified io address space mapping to the provided device, | |
1801 | * this replaces the dma operations (dma_map_ops pointer) with the | |
1802 | * IOMMU aware version. More than one client might be attached to | |
1803 | * the same io address space mapping. | |
1804 | */ | |
1805 | int arm_iommu_attach_device(struct device *dev, | |
1806 | struct dma_iommu_mapping *mapping) | |
1807 | { | |
1808 | int err; | |
1809 | ||
1810 | err = iommu_attach_device(mapping->domain, dev); | |
1811 | if (err) | |
1812 | return err; | |
1813 | ||
1814 | kref_get(&mapping->kref); | |
1815 | dev->archdata.mapping = mapping; | |
1816 | set_dma_ops(dev, &iommu_ops); | |
1817 | ||
75c59716 | 1818 | pr_debug("Attached IOMMU controller to %s device.\n", dev_name(dev)); |
4ce63fcd MS |
1819 | return 0; |
1820 | } | |
1821 | ||
1822 | #endif |