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69d3a84a HD |
1 | /* |
2 | * omap iommu: simple virtual address space management | |
3 | * | |
4 | * Copyright (C) 2008-2009 Nokia Corporation | |
5 | * | |
6 | * Written by Hiroshi DOYU <Hiroshi.DOYU@nokia.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
13 | #include <linux/err.h> | |
14 | #include <linux/vmalloc.h> | |
15 | #include <linux/device.h> | |
16 | #include <linux/scatterlist.h> | |
17 | ||
18 | #include <asm/cacheflush.h> | |
19 | #include <asm/mach/map.h> | |
20 | ||
21 | #include <mach/iommu.h> | |
22 | #include <mach/iovmm.h> | |
23 | ||
24 | #include "iopgtable.h" | |
25 | ||
26 | /* | |
27 | * A device driver needs to create address mappings between: | |
28 | * | |
29 | * - iommu/device address | |
30 | * - physical address | |
31 | * - mpu virtual address | |
32 | * | |
33 | * There are 4 possible patterns for them: | |
34 | * | |
35 | * |iova/ mapping iommu_ page | |
36 | * | da pa va (d)-(p)-(v) function type | |
37 | * --------------------------------------------------------------------------- | |
38 | * 1 | c c c 1 - 1 - 1 _kmap() / _kunmap() s | |
39 | * 2 | c c,a c 1 - 1 - 1 _kmalloc()/ _kfree() s | |
40 | * 3 | c d c 1 - n - 1 _vmap() / _vunmap() s | |
41 | * 4 | c d,a c 1 - n - 1 _vmalloc()/ _vfree() n* | |
42 | * | |
43 | * | |
44 | * 'iova': device iommu virtual address | |
45 | * 'da': alias of 'iova' | |
46 | * 'pa': physical address | |
47 | * 'va': mpu virtual address | |
48 | * | |
49 | * 'c': contiguous memory area | |
50 | * 'd': dicontiguous memory area | |
51 | * 'a': anonymous memory allocation | |
52 | * '()': optional feature | |
53 | * | |
54 | * 'n': a normal page(4KB) size is used. | |
55 | * 's': multiple iommu superpage(16MB, 1MB, 64KB, 4KB) size is used. | |
56 | * | |
57 | * '*': not yet, but feasible. | |
58 | */ | |
59 | ||
60 | static struct kmem_cache *iovm_area_cachep; | |
61 | ||
62 | /* return total bytes of sg buffers */ | |
63 | static size_t sgtable_len(const struct sg_table *sgt) | |
64 | { | |
65 | unsigned int i, total = 0; | |
66 | struct scatterlist *sg; | |
67 | ||
68 | if (!sgt) | |
69 | return 0; | |
70 | ||
71 | for_each_sg(sgt->sgl, sg, sgt->nents, i) { | |
72 | size_t bytes; | |
73 | ||
74 | bytes = sg_dma_len(sg); | |
75 | ||
76 | if (!iopgsz_ok(bytes)) { | |
77 | pr_err("%s: sg[%d] not iommu pagesize(%x)\n", | |
78 | __func__, i, bytes); | |
79 | return 0; | |
80 | } | |
81 | ||
82 | total += bytes; | |
83 | } | |
84 | ||
85 | return total; | |
86 | } | |
87 | #define sgtable_ok(x) (!!sgtable_len(x)) | |
88 | ||
89 | /* | |
90 | * calculate the optimal number sg elements from total bytes based on | |
91 | * iommu superpages | |
92 | */ | |
93 | static unsigned int sgtable_nents(size_t bytes) | |
94 | { | |
95 | int i; | |
96 | unsigned int nr_entries; | |
97 | const unsigned long pagesize[] = { SZ_16M, SZ_1M, SZ_64K, SZ_4K, }; | |
98 | ||
99 | if (!IS_ALIGNED(bytes, PAGE_SIZE)) { | |
100 | pr_err("%s: wrong size %08x\n", __func__, bytes); | |
101 | return 0; | |
102 | } | |
103 | ||
104 | nr_entries = 0; | |
105 | for (i = 0; i < ARRAY_SIZE(pagesize); i++) { | |
106 | if (bytes >= pagesize[i]) { | |
107 | nr_entries += (bytes / pagesize[i]); | |
108 | bytes %= pagesize[i]; | |
109 | } | |
110 | } | |
111 | BUG_ON(bytes); | |
112 | ||
113 | return nr_entries; | |
114 | } | |
115 | ||
116 | /* allocate and initialize sg_table header(a kind of 'superblock') */ | |
117 | static struct sg_table *sgtable_alloc(const size_t bytes, u32 flags) | |
118 | { | |
119 | unsigned int nr_entries; | |
120 | int err; | |
121 | struct sg_table *sgt; | |
122 | ||
123 | if (!bytes) | |
124 | return ERR_PTR(-EINVAL); | |
125 | ||
126 | if (!IS_ALIGNED(bytes, PAGE_SIZE)) | |
127 | return ERR_PTR(-EINVAL); | |
128 | ||
129 | /* FIXME: IOVMF_DA_FIXED should support 'superpages' */ | |
130 | if ((flags & IOVMF_LINEAR) && (flags & IOVMF_DA_ANON)) { | |
131 | nr_entries = sgtable_nents(bytes); | |
132 | if (!nr_entries) | |
133 | return ERR_PTR(-EINVAL); | |
134 | } else | |
135 | nr_entries = bytes / PAGE_SIZE; | |
136 | ||
137 | sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); | |
138 | if (!sgt) | |
139 | return ERR_PTR(-ENOMEM); | |
140 | ||
141 | err = sg_alloc_table(sgt, nr_entries, GFP_KERNEL); | |
142 | if (err) | |
143 | return ERR_PTR(err); | |
144 | ||
145 | pr_debug("%s: sgt:%p(%d entries)\n", __func__, sgt, nr_entries); | |
146 | ||
147 | return sgt; | |
148 | } | |
149 | ||
150 | /* free sg_table header(a kind of superblock) */ | |
151 | static void sgtable_free(struct sg_table *sgt) | |
152 | { | |
153 | if (!sgt) | |
154 | return; | |
155 | ||
156 | sg_free_table(sgt); | |
157 | kfree(sgt); | |
158 | ||
159 | pr_debug("%s: sgt:%p\n", __func__, sgt); | |
160 | } | |
161 | ||
162 | /* map 'sglist' to a contiguous mpu virtual area and return 'va' */ | |
163 | static void *vmap_sg(const struct sg_table *sgt) | |
164 | { | |
165 | u32 va; | |
166 | size_t total; | |
167 | unsigned int i; | |
168 | struct scatterlist *sg; | |
169 | struct vm_struct *new; | |
170 | const struct mem_type *mtype; | |
171 | ||
172 | mtype = get_mem_type(MT_DEVICE); | |
173 | if (!mtype) | |
174 | return ERR_PTR(-EINVAL); | |
175 | ||
176 | total = sgtable_len(sgt); | |
177 | if (!total) | |
178 | return ERR_PTR(-EINVAL); | |
179 | ||
180 | new = __get_vm_area(total, VM_IOREMAP, VMALLOC_START, VMALLOC_END); | |
181 | if (!new) | |
182 | return ERR_PTR(-ENOMEM); | |
183 | va = (u32)new->addr; | |
184 | ||
185 | for_each_sg(sgt->sgl, sg, sgt->nents, i) { | |
186 | size_t bytes; | |
187 | u32 pa; | |
188 | int err; | |
189 | ||
190 | pa = sg_phys(sg); | |
191 | bytes = sg_dma_len(sg); | |
192 | ||
193 | BUG_ON(bytes != PAGE_SIZE); | |
194 | ||
195 | err = ioremap_page(va, pa, mtype); | |
196 | if (err) | |
197 | goto err_out; | |
198 | ||
199 | va += bytes; | |
200 | } | |
201 | ||
613f7769 | 202 | flush_cache_vmap(new->addr, new->addr + total); |
69d3a84a HD |
203 | return new->addr; |
204 | ||
205 | err_out: | |
206 | WARN_ON(1); /* FIXME: cleanup some mpu mappings */ | |
207 | vunmap(new->addr); | |
208 | return ERR_PTR(-EAGAIN); | |
209 | } | |
210 | ||
211 | static inline void vunmap_sg(const void *va) | |
212 | { | |
213 | vunmap(va); | |
214 | } | |
215 | ||
216 | static struct iovm_struct *__find_iovm_area(struct iommu *obj, const u32 da) | |
217 | { | |
218 | struct iovm_struct *tmp; | |
219 | ||
220 | list_for_each_entry(tmp, &obj->mmap, list) { | |
221 | if ((da >= tmp->da_start) && (da < tmp->da_end)) { | |
222 | size_t len; | |
223 | ||
224 | len = tmp->da_end - tmp->da_start; | |
225 | ||
226 | dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n", | |
227 | __func__, tmp->da_start, da, tmp->da_end, len, | |
228 | tmp->flags); | |
229 | ||
230 | return tmp; | |
231 | } | |
232 | } | |
233 | ||
234 | return NULL; | |
235 | } | |
236 | ||
237 | /** | |
238 | * find_iovm_area - find iovma which includes @da | |
239 | * @da: iommu device virtual address | |
240 | * | |
241 | * Find the existing iovma starting at @da | |
242 | */ | |
243 | struct iovm_struct *find_iovm_area(struct iommu *obj, u32 da) | |
244 | { | |
245 | struct iovm_struct *area; | |
246 | ||
247 | mutex_lock(&obj->mmap_lock); | |
248 | area = __find_iovm_area(obj, da); | |
249 | mutex_unlock(&obj->mmap_lock); | |
250 | ||
251 | return area; | |
252 | } | |
253 | EXPORT_SYMBOL_GPL(find_iovm_area); | |
254 | ||
255 | /* | |
256 | * This finds the hole(area) which fits the requested address and len | |
257 | * in iovmas mmap, and returns the new allocated iovma. | |
258 | */ | |
259 | static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da, | |
260 | size_t bytes, u32 flags) | |
261 | { | |
262 | struct iovm_struct *new, *tmp; | |
263 | u32 start, prev_end, alignement; | |
264 | ||
265 | if (!obj || !bytes) | |
266 | return ERR_PTR(-EINVAL); | |
267 | ||
268 | start = da; | |
269 | alignement = PAGE_SIZE; | |
270 | ||
271 | if (flags & IOVMF_DA_ANON) { | |
272 | /* | |
273 | * Reserve the first page for NULL | |
274 | */ | |
275 | start = PAGE_SIZE; | |
276 | if (flags & IOVMF_LINEAR) | |
277 | alignement = iopgsz_max(bytes); | |
278 | start = roundup(start, alignement); | |
279 | } | |
280 | ||
281 | tmp = NULL; | |
282 | if (list_empty(&obj->mmap)) | |
283 | goto found; | |
284 | ||
285 | prev_end = 0; | |
286 | list_for_each_entry(tmp, &obj->mmap, list) { | |
287 | ||
288 | if ((prev_end <= start) && (start + bytes < tmp->da_start)) | |
289 | goto found; | |
290 | ||
291 | if (flags & IOVMF_DA_ANON) | |
292 | start = roundup(tmp->da_end, alignement); | |
293 | ||
294 | prev_end = tmp->da_end; | |
295 | } | |
296 | ||
297 | if ((start >= prev_end) && (ULONG_MAX - start >= bytes)) | |
298 | goto found; | |
299 | ||
300 | dev_dbg(obj->dev, "%s: no space to fit %08x(%x) flags: %08x\n", | |
301 | __func__, da, bytes, flags); | |
302 | ||
303 | return ERR_PTR(-EINVAL); | |
304 | ||
305 | found: | |
306 | new = kmem_cache_zalloc(iovm_area_cachep, GFP_KERNEL); | |
307 | if (!new) | |
308 | return ERR_PTR(-ENOMEM); | |
309 | ||
310 | new->iommu = obj; | |
311 | new->da_start = start; | |
312 | new->da_end = start + bytes; | |
313 | new->flags = flags; | |
314 | ||
315 | /* | |
316 | * keep ascending order of iovmas | |
317 | */ | |
318 | if (tmp) | |
319 | list_add_tail(&new->list, &tmp->list); | |
320 | else | |
321 | list_add(&new->list, &obj->mmap); | |
322 | ||
323 | dev_dbg(obj->dev, "%s: found %08x-%08x-%08x(%x) %08x\n", | |
324 | __func__, new->da_start, start, new->da_end, bytes, flags); | |
325 | ||
326 | return new; | |
327 | } | |
328 | ||
329 | static void free_iovm_area(struct iommu *obj, struct iovm_struct *area) | |
330 | { | |
331 | size_t bytes; | |
332 | ||
333 | BUG_ON(!obj || !area); | |
334 | ||
335 | bytes = area->da_end - area->da_start; | |
336 | ||
337 | dev_dbg(obj->dev, "%s: %08x-%08x(%x) %08x\n", | |
338 | __func__, area->da_start, area->da_end, bytes, area->flags); | |
339 | ||
340 | list_del(&area->list); | |
341 | kmem_cache_free(iovm_area_cachep, area); | |
342 | } | |
343 | ||
344 | /** | |
345 | * da_to_va - convert (d) to (v) | |
346 | * @obj: objective iommu | |
347 | * @da: iommu device virtual address | |
348 | * @va: mpu virtual address | |
349 | * | |
350 | * Returns mpu virtual addr which corresponds to a given device virtual addr | |
351 | */ | |
352 | void *da_to_va(struct iommu *obj, u32 da) | |
353 | { | |
354 | void *va = NULL; | |
355 | struct iovm_struct *area; | |
356 | ||
357 | mutex_lock(&obj->mmap_lock); | |
358 | ||
359 | area = __find_iovm_area(obj, da); | |
360 | if (!area) { | |
361 | dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da); | |
362 | goto out; | |
363 | } | |
364 | va = area->va; | |
365 | mutex_unlock(&obj->mmap_lock); | |
366 | out: | |
367 | return va; | |
368 | } | |
369 | EXPORT_SYMBOL_GPL(da_to_va); | |
370 | ||
371 | static void sgtable_fill_vmalloc(struct sg_table *sgt, void *_va) | |
372 | { | |
373 | unsigned int i; | |
374 | struct scatterlist *sg; | |
375 | void *va = _va; | |
376 | void *va_end; | |
377 | ||
378 | for_each_sg(sgt->sgl, sg, sgt->nents, i) { | |
379 | struct page *pg; | |
380 | const size_t bytes = PAGE_SIZE; | |
381 | ||
382 | /* | |
383 | * iommu 'superpage' isn't supported with 'iommu_vmalloc()' | |
384 | */ | |
385 | pg = vmalloc_to_page(va); | |
386 | BUG_ON(!pg); | |
387 | sg_set_page(sg, pg, bytes, 0); | |
388 | ||
389 | va += bytes; | |
390 | } | |
391 | ||
392 | va_end = _va + PAGE_SIZE * i; | |
393 | flush_cache_vmap(_va, va_end); | |
394 | } | |
395 | ||
396 | static inline void sgtable_drain_vmalloc(struct sg_table *sgt) | |
397 | { | |
398 | /* | |
399 | * Actually this is not necessary at all, just exists for | |
400 | * consistency of the code readibility. | |
401 | */ | |
402 | BUG_ON(!sgt); | |
403 | } | |
404 | ||
405 | static void sgtable_fill_kmalloc(struct sg_table *sgt, u32 pa, size_t len) | |
406 | { | |
407 | unsigned int i; | |
408 | struct scatterlist *sg; | |
409 | void *va; | |
410 | ||
411 | va = phys_to_virt(pa); | |
412 | ||
413 | for_each_sg(sgt->sgl, sg, sgt->nents, i) { | |
414 | size_t bytes; | |
415 | ||
416 | bytes = iopgsz_max(len); | |
417 | ||
418 | BUG_ON(!iopgsz_ok(bytes)); | |
419 | ||
420 | sg_set_buf(sg, phys_to_virt(pa), bytes); | |
421 | /* | |
422 | * 'pa' is cotinuous(linear). | |
423 | */ | |
424 | pa += bytes; | |
425 | len -= bytes; | |
426 | } | |
427 | BUG_ON(len); | |
428 | ||
429 | clean_dcache_area(va, len); | |
430 | } | |
431 | ||
432 | static inline void sgtable_drain_kmalloc(struct sg_table *sgt) | |
433 | { | |
434 | /* | |
435 | * Actually this is not necessary at all, just exists for | |
436 | * consistency of the code readibility | |
437 | */ | |
438 | BUG_ON(!sgt); | |
439 | } | |
440 | ||
441 | /* create 'da' <-> 'pa' mapping from 'sgt' */ | |
442 | static int map_iovm_area(struct iommu *obj, struct iovm_struct *new, | |
443 | const struct sg_table *sgt, u32 flags) | |
444 | { | |
445 | int err; | |
446 | unsigned int i, j; | |
447 | struct scatterlist *sg; | |
448 | u32 da = new->da_start; | |
449 | ||
450 | if (!obj || !new || !sgt) | |
451 | return -EINVAL; | |
452 | ||
453 | BUG_ON(!sgtable_ok(sgt)); | |
454 | ||
455 | for_each_sg(sgt->sgl, sg, sgt->nents, i) { | |
456 | u32 pa; | |
457 | int pgsz; | |
458 | size_t bytes; | |
459 | struct iotlb_entry e; | |
460 | ||
461 | pa = sg_phys(sg); | |
462 | bytes = sg_dma_len(sg); | |
463 | ||
464 | flags &= ~IOVMF_PGSZ_MASK; | |
465 | pgsz = bytes_to_iopgsz(bytes); | |
466 | if (pgsz < 0) | |
467 | goto err_out; | |
468 | flags |= pgsz; | |
469 | ||
470 | pr_debug("%s: [%d] %08x %08x(%x)\n", __func__, | |
471 | i, da, pa, bytes); | |
472 | ||
473 | iotlb_init_entry(&e, da, pa, flags); | |
474 | err = iopgtable_store_entry(obj, &e); | |
475 | if (err) | |
476 | goto err_out; | |
477 | ||
478 | da += bytes; | |
479 | } | |
480 | return 0; | |
481 | ||
482 | err_out: | |
483 | da = new->da_start; | |
484 | ||
485 | for_each_sg(sgt->sgl, sg, i, j) { | |
486 | size_t bytes; | |
487 | ||
488 | bytes = iopgtable_clear_entry(obj, da); | |
489 | ||
490 | BUG_ON(!iopgsz_ok(bytes)); | |
491 | ||
492 | da += bytes; | |
493 | } | |
494 | return err; | |
495 | } | |
496 | ||
497 | /* release 'da' <-> 'pa' mapping */ | |
498 | static void unmap_iovm_area(struct iommu *obj, struct iovm_struct *area) | |
499 | { | |
500 | u32 start; | |
501 | size_t total = area->da_end - area->da_start; | |
502 | ||
503 | BUG_ON((!total) || !IS_ALIGNED(total, PAGE_SIZE)); | |
504 | ||
505 | start = area->da_start; | |
506 | while (total > 0) { | |
507 | size_t bytes; | |
508 | ||
509 | bytes = iopgtable_clear_entry(obj, start); | |
510 | if (bytes == 0) | |
511 | bytes = PAGE_SIZE; | |
512 | else | |
513 | dev_dbg(obj->dev, "%s: unmap %08x(%x) %08x\n", | |
514 | __func__, start, bytes, area->flags); | |
515 | ||
516 | BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE)); | |
517 | ||
518 | total -= bytes; | |
519 | start += bytes; | |
520 | } | |
521 | BUG_ON(total); | |
522 | } | |
523 | ||
524 | /* template function for all unmapping */ | |
525 | static struct sg_table *unmap_vm_area(struct iommu *obj, const u32 da, | |
526 | void (*fn)(const void *), u32 flags) | |
527 | { | |
528 | struct sg_table *sgt = NULL; | |
529 | struct iovm_struct *area; | |
530 | ||
531 | if (!IS_ALIGNED(da, PAGE_SIZE)) { | |
532 | dev_err(obj->dev, "%s: alignment err(%08x)\n", __func__, da); | |
533 | return NULL; | |
534 | } | |
535 | ||
536 | mutex_lock(&obj->mmap_lock); | |
537 | ||
538 | area = __find_iovm_area(obj, da); | |
539 | if (!area) { | |
540 | dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da); | |
541 | goto out; | |
542 | } | |
543 | ||
544 | if ((area->flags & flags) != flags) { | |
545 | dev_err(obj->dev, "%s: wrong flags(%08x)\n", __func__, | |
546 | area->flags); | |
547 | goto out; | |
548 | } | |
549 | sgt = (struct sg_table *)area->sgt; | |
550 | ||
551 | unmap_iovm_area(obj, area); | |
552 | ||
553 | fn(area->va); | |
554 | ||
555 | dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n", __func__, | |
556 | area->da_start, da, area->da_end, | |
557 | area->da_end - area->da_start, area->flags); | |
558 | ||
559 | free_iovm_area(obj, area); | |
560 | out: | |
561 | mutex_unlock(&obj->mmap_lock); | |
562 | ||
563 | return sgt; | |
564 | } | |
565 | ||
566 | static u32 map_iommu_region(struct iommu *obj, u32 da, | |
567 | const struct sg_table *sgt, void *va, size_t bytes, u32 flags) | |
568 | { | |
569 | int err = -ENOMEM; | |
570 | struct iovm_struct *new; | |
571 | ||
572 | mutex_lock(&obj->mmap_lock); | |
573 | ||
574 | new = alloc_iovm_area(obj, da, bytes, flags); | |
575 | if (IS_ERR(new)) { | |
576 | err = PTR_ERR(new); | |
577 | goto err_alloc_iovma; | |
578 | } | |
579 | new->va = va; | |
580 | new->sgt = sgt; | |
581 | ||
582 | if (map_iovm_area(obj, new, sgt, new->flags)) | |
583 | goto err_map; | |
584 | ||
585 | mutex_unlock(&obj->mmap_lock); | |
586 | ||
587 | dev_dbg(obj->dev, "%s: da:%08x(%x) flags:%08x va:%p\n", | |
588 | __func__, new->da_start, bytes, new->flags, va); | |
589 | ||
590 | return new->da_start; | |
591 | ||
592 | err_map: | |
593 | free_iovm_area(obj, new); | |
594 | err_alloc_iovma: | |
595 | mutex_unlock(&obj->mmap_lock); | |
596 | return err; | |
597 | } | |
598 | ||
599 | static inline u32 __iommu_vmap(struct iommu *obj, u32 da, | |
600 | const struct sg_table *sgt, void *va, size_t bytes, u32 flags) | |
601 | { | |
602 | return map_iommu_region(obj, da, sgt, va, bytes, flags); | |
603 | } | |
604 | ||
605 | /** | |
606 | * iommu_vmap - (d)-(p)-(v) address mapper | |
607 | * @obj: objective iommu | |
608 | * @sgt: address of scatter gather table | |
609 | * @flags: iovma and page property | |
610 | * | |
611 | * Creates 1-n-1 mapping with given @sgt and returns @da. | |
612 | * All @sgt element must be io page size aligned. | |
613 | */ | |
614 | u32 iommu_vmap(struct iommu *obj, u32 da, const struct sg_table *sgt, | |
615 | u32 flags) | |
616 | { | |
617 | size_t bytes; | |
618 | void *va; | |
619 | ||
620 | if (!obj || !obj->dev || !sgt) | |
621 | return -EINVAL; | |
622 | ||
623 | bytes = sgtable_len(sgt); | |
624 | if (!bytes) | |
625 | return -EINVAL; | |
626 | bytes = PAGE_ALIGN(bytes); | |
627 | ||
628 | va = vmap_sg(sgt); | |
629 | if (IS_ERR(va)) | |
630 | return PTR_ERR(va); | |
631 | ||
632 | flags &= IOVMF_HW_MASK; | |
633 | flags |= IOVMF_DISCONT; | |
634 | flags |= IOVMF_MMIO; | |
635 | flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON); | |
636 | ||
637 | da = __iommu_vmap(obj, da, sgt, va, bytes, flags); | |
638 | if (IS_ERR_VALUE(da)) | |
639 | vunmap_sg(va); | |
640 | ||
641 | return da; | |
642 | } | |
643 | EXPORT_SYMBOL_GPL(iommu_vmap); | |
644 | ||
645 | /** | |
646 | * iommu_vunmap - release virtual mapping obtained by 'iommu_vmap()' | |
647 | * @obj: objective iommu | |
648 | * @da: iommu device virtual address | |
649 | * | |
650 | * Free the iommu virtually contiguous memory area starting at | |
651 | * @da, which was returned by 'iommu_vmap()'. | |
652 | */ | |
653 | struct sg_table *iommu_vunmap(struct iommu *obj, u32 da) | |
654 | { | |
655 | struct sg_table *sgt; | |
656 | /* | |
657 | * 'sgt' is allocated before 'iommu_vmalloc()' is called. | |
658 | * Just returns 'sgt' to the caller to free | |
659 | */ | |
660 | sgt = unmap_vm_area(obj, da, vunmap_sg, IOVMF_DISCONT | IOVMF_MMIO); | |
661 | if (!sgt) | |
662 | dev_dbg(obj->dev, "%s: No sgt\n", __func__); | |
663 | return sgt; | |
664 | } | |
665 | EXPORT_SYMBOL_GPL(iommu_vunmap); | |
666 | ||
667 | /** | |
668 | * iommu_vmalloc - (d)-(p)-(v) address allocator and mapper | |
669 | * @obj: objective iommu | |
670 | * @da: contiguous iommu virtual memory | |
671 | * @bytes: allocation size | |
672 | * @flags: iovma and page property | |
673 | * | |
674 | * Allocate @bytes linearly and creates 1-n-1 mapping and returns | |
675 | * @da again, which might be adjusted if 'IOVMF_DA_ANON' is set. | |
676 | */ | |
677 | u32 iommu_vmalloc(struct iommu *obj, u32 da, size_t bytes, u32 flags) | |
678 | { | |
679 | void *va; | |
680 | struct sg_table *sgt; | |
681 | ||
682 | if (!obj || !obj->dev || !bytes) | |
683 | return -EINVAL; | |
684 | ||
685 | bytes = PAGE_ALIGN(bytes); | |
686 | ||
687 | va = vmalloc(bytes); | |
688 | if (!va) | |
689 | return -ENOMEM; | |
690 | ||
691 | sgt = sgtable_alloc(bytes, flags); | |
692 | if (IS_ERR(sgt)) { | |
693 | da = PTR_ERR(sgt); | |
694 | goto err_sgt_alloc; | |
695 | } | |
696 | sgtable_fill_vmalloc(sgt, va); | |
697 | ||
698 | flags &= IOVMF_HW_MASK; | |
699 | flags |= IOVMF_DISCONT; | |
700 | flags |= IOVMF_ALLOC; | |
701 | flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON); | |
702 | ||
703 | da = __iommu_vmap(obj, da, sgt, va, bytes, flags); | |
704 | if (IS_ERR_VALUE(da)) | |
705 | goto err_iommu_vmap; | |
706 | ||
707 | return da; | |
708 | ||
709 | err_iommu_vmap: | |
710 | sgtable_drain_vmalloc(sgt); | |
711 | sgtable_free(sgt); | |
712 | err_sgt_alloc: | |
713 | vfree(va); | |
714 | return da; | |
715 | } | |
716 | EXPORT_SYMBOL_GPL(iommu_vmalloc); | |
717 | ||
718 | /** | |
719 | * iommu_vfree - release memory allocated by 'iommu_vmalloc()' | |
720 | * @obj: objective iommu | |
721 | * @da: iommu device virtual address | |
722 | * | |
723 | * Frees the iommu virtually continuous memory area starting at | |
724 | * @da, as obtained from 'iommu_vmalloc()'. | |
725 | */ | |
726 | void iommu_vfree(struct iommu *obj, const u32 da) | |
727 | { | |
728 | struct sg_table *sgt; | |
729 | ||
730 | sgt = unmap_vm_area(obj, da, vfree, IOVMF_DISCONT | IOVMF_ALLOC); | |
731 | if (!sgt) | |
732 | dev_dbg(obj->dev, "%s: No sgt\n", __func__); | |
733 | sgtable_free(sgt); | |
734 | } | |
735 | EXPORT_SYMBOL_GPL(iommu_vfree); | |
736 | ||
737 | static u32 __iommu_kmap(struct iommu *obj, u32 da, u32 pa, void *va, | |
738 | size_t bytes, u32 flags) | |
739 | { | |
740 | struct sg_table *sgt; | |
741 | ||
742 | sgt = sgtable_alloc(bytes, flags); | |
743 | if (IS_ERR(sgt)) | |
744 | return PTR_ERR(sgt); | |
745 | ||
746 | sgtable_fill_kmalloc(sgt, pa, bytes); | |
747 | ||
748 | da = map_iommu_region(obj, da, sgt, va, bytes, flags); | |
749 | if (IS_ERR_VALUE(da)) { | |
750 | sgtable_drain_kmalloc(sgt); | |
751 | sgtable_free(sgt); | |
752 | } | |
753 | ||
754 | return da; | |
755 | } | |
756 | ||
757 | /** | |
758 | * iommu_kmap - (d)-(p)-(v) address mapper | |
759 | * @obj: objective iommu | |
760 | * @da: contiguous iommu virtual memory | |
761 | * @pa: contiguous physical memory | |
762 | * @flags: iovma and page property | |
763 | * | |
764 | * Creates 1-1-1 mapping and returns @da again, which can be | |
765 | * adjusted if 'IOVMF_DA_ANON' is set. | |
766 | */ | |
767 | u32 iommu_kmap(struct iommu *obj, u32 da, u32 pa, size_t bytes, | |
768 | u32 flags) | |
769 | { | |
770 | void *va; | |
771 | ||
772 | if (!obj || !obj->dev || !bytes) | |
773 | return -EINVAL; | |
774 | ||
775 | bytes = PAGE_ALIGN(bytes); | |
776 | ||
777 | va = ioremap(pa, bytes); | |
778 | if (!va) | |
779 | return -ENOMEM; | |
780 | ||
781 | flags &= IOVMF_HW_MASK; | |
782 | flags |= IOVMF_LINEAR; | |
783 | flags |= IOVMF_MMIO; | |
784 | flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON); | |
785 | ||
786 | da = __iommu_kmap(obj, da, pa, va, bytes, flags); | |
787 | if (IS_ERR_VALUE(da)) | |
788 | iounmap(va); | |
789 | ||
790 | return da; | |
791 | } | |
792 | EXPORT_SYMBOL_GPL(iommu_kmap); | |
793 | ||
794 | /** | |
795 | * iommu_kunmap - release virtual mapping obtained by 'iommu_kmap()' | |
796 | * @obj: objective iommu | |
797 | * @da: iommu device virtual address | |
798 | * | |
799 | * Frees the iommu virtually contiguous memory area starting at | |
800 | * @da, which was passed to and was returned by'iommu_kmap()'. | |
801 | */ | |
802 | void iommu_kunmap(struct iommu *obj, u32 da) | |
803 | { | |
804 | struct sg_table *sgt; | |
805 | typedef void (*func_t)(const void *); | |
806 | ||
807 | sgt = unmap_vm_area(obj, da, (func_t)__iounmap, | |
808 | IOVMF_LINEAR | IOVMF_MMIO); | |
809 | if (!sgt) | |
810 | dev_dbg(obj->dev, "%s: No sgt\n", __func__); | |
811 | sgtable_free(sgt); | |
812 | } | |
813 | EXPORT_SYMBOL_GPL(iommu_kunmap); | |
814 | ||
815 | /** | |
816 | * iommu_kmalloc - (d)-(p)-(v) address allocator and mapper | |
817 | * @obj: objective iommu | |
818 | * @da: contiguous iommu virtual memory | |
819 | * @bytes: bytes for allocation | |
820 | * @flags: iovma and page property | |
821 | * | |
822 | * Allocate @bytes linearly and creates 1-1-1 mapping and returns | |
823 | * @da again, which might be adjusted if 'IOVMF_DA_ANON' is set. | |
824 | */ | |
825 | u32 iommu_kmalloc(struct iommu *obj, u32 da, size_t bytes, u32 flags) | |
826 | { | |
827 | void *va; | |
828 | u32 pa; | |
829 | ||
830 | if (!obj || !obj->dev || !bytes) | |
831 | return -EINVAL; | |
832 | ||
833 | bytes = PAGE_ALIGN(bytes); | |
834 | ||
835 | va = kmalloc(bytes, GFP_KERNEL | GFP_DMA); | |
836 | if (!va) | |
837 | return -ENOMEM; | |
838 | pa = virt_to_phys(va); | |
839 | ||
840 | flags &= IOVMF_HW_MASK; | |
841 | flags |= IOVMF_LINEAR; | |
842 | flags |= IOVMF_ALLOC; | |
843 | flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON); | |
844 | ||
845 | da = __iommu_kmap(obj, da, pa, va, bytes, flags); | |
846 | if (IS_ERR_VALUE(da)) | |
847 | kfree(va); | |
848 | ||
849 | return da; | |
850 | } | |
851 | EXPORT_SYMBOL_GPL(iommu_kmalloc); | |
852 | ||
853 | /** | |
854 | * iommu_kfree - release virtual mapping obtained by 'iommu_kmalloc()' | |
855 | * @obj: objective iommu | |
856 | * @da: iommu device virtual address | |
857 | * | |
858 | * Frees the iommu virtually contiguous memory area starting at | |
859 | * @da, which was passed to and was returned by'iommu_kmalloc()'. | |
860 | */ | |
861 | void iommu_kfree(struct iommu *obj, u32 da) | |
862 | { | |
863 | struct sg_table *sgt; | |
864 | ||
865 | sgt = unmap_vm_area(obj, da, kfree, IOVMF_LINEAR | IOVMF_ALLOC); | |
866 | if (!sgt) | |
867 | dev_dbg(obj->dev, "%s: No sgt\n", __func__); | |
868 | sgtable_free(sgt); | |
869 | } | |
870 | EXPORT_SYMBOL_GPL(iommu_kfree); | |
871 | ||
872 | ||
873 | static int __init iovmm_init(void) | |
874 | { | |
875 | const unsigned long flags = SLAB_HWCACHE_ALIGN; | |
876 | struct kmem_cache *p; | |
877 | ||
878 | p = kmem_cache_create("iovm_area_cache", sizeof(struct iovm_struct), 0, | |
879 | flags, NULL); | |
880 | if (!p) | |
881 | return -ENOMEM; | |
882 | iovm_area_cachep = p; | |
883 | ||
884 | return 0; | |
885 | } | |
886 | module_init(iovmm_init); | |
887 | ||
888 | static void __exit iovmm_exit(void) | |
889 | { | |
890 | kmem_cache_destroy(iovm_area_cachep); | |
891 | } | |
892 | module_exit(iovmm_exit); | |
893 | ||
894 | MODULE_DESCRIPTION("omap iommu: simple virtual address space management"); | |
895 | MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>"); | |
896 | MODULE_LICENSE("GPL v2"); |