Commit | Line | Data |
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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> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
69d3a84a HD |
15 | #include <linux/vmalloc.h> |
16 | #include <linux/device.h> | |
17 | #include <linux/scatterlist.h> | |
18 | ||
19 | #include <asm/cacheflush.h> | |
20 | #include <asm/mach/map.h> | |
21 | ||
ce491cf8 TL |
22 | #include <plat/iommu.h> |
23 | #include <plat/iovmm.h> | |
69d3a84a HD |
24 | |
25 | #include "iopgtable.h" | |
26 | ||
27 | /* | |
28 | * A device driver needs to create address mappings between: | |
29 | * | |
30 | * - iommu/device address | |
31 | * - physical address | |
32 | * - mpu virtual address | |
33 | * | |
34 | * There are 4 possible patterns for them: | |
35 | * | |
36 | * |iova/ mapping iommu_ page | |
37 | * | da pa va (d)-(p)-(v) function type | |
38 | * --------------------------------------------------------------------------- | |
39 | * 1 | c c c 1 - 1 - 1 _kmap() / _kunmap() s | |
40 | * 2 | c c,a c 1 - 1 - 1 _kmalloc()/ _kfree() s | |
41 | * 3 | c d c 1 - n - 1 _vmap() / _vunmap() s | |
42 | * 4 | c d,a c 1 - n - 1 _vmalloc()/ _vfree() n* | |
43 | * | |
44 | * | |
45 | * 'iova': device iommu virtual address | |
46 | * 'da': alias of 'iova' | |
47 | * 'pa': physical address | |
48 | * 'va': mpu virtual address | |
49 | * | |
50 | * 'c': contiguous memory area | |
ba6a1179 | 51 | * 'd': discontiguous memory area |
69d3a84a HD |
52 | * 'a': anonymous memory allocation |
53 | * '()': optional feature | |
54 | * | |
55 | * 'n': a normal page(4KB) size is used. | |
56 | * 's': multiple iommu superpage(16MB, 1MB, 64KB, 4KB) size is used. | |
57 | * | |
58 | * '*': not yet, but feasible. | |
59 | */ | |
60 | ||
61 | static struct kmem_cache *iovm_area_cachep; | |
62 | ||
63 | /* return total bytes of sg buffers */ | |
64 | static size_t sgtable_len(const struct sg_table *sgt) | |
65 | { | |
66 | unsigned int i, total = 0; | |
67 | struct scatterlist *sg; | |
68 | ||
69 | if (!sgt) | |
70 | return 0; | |
71 | ||
72 | for_each_sg(sgt->sgl, sg, sgt->nents, i) { | |
73 | size_t bytes; | |
74 | ||
75 | bytes = sg_dma_len(sg); | |
76 | ||
77 | if (!iopgsz_ok(bytes)) { | |
78 | pr_err("%s: sg[%d] not iommu pagesize(%x)\n", | |
79 | __func__, i, bytes); | |
80 | return 0; | |
81 | } | |
82 | ||
83 | total += bytes; | |
84 | } | |
85 | ||
86 | return total; | |
87 | } | |
88 | #define sgtable_ok(x) (!!sgtable_len(x)) | |
89 | ||
90 | /* | |
91 | * calculate the optimal number sg elements from total bytes based on | |
92 | * iommu superpages | |
93 | */ | |
94 | static unsigned int sgtable_nents(size_t bytes) | |
95 | { | |
96 | int i; | |
97 | unsigned int nr_entries; | |
98 | const unsigned long pagesize[] = { SZ_16M, SZ_1M, SZ_64K, SZ_4K, }; | |
99 | ||
100 | if (!IS_ALIGNED(bytes, PAGE_SIZE)) { | |
101 | pr_err("%s: wrong size %08x\n", __func__, bytes); | |
102 | return 0; | |
103 | } | |
104 | ||
105 | nr_entries = 0; | |
106 | for (i = 0; i < ARRAY_SIZE(pagesize); i++) { | |
107 | if (bytes >= pagesize[i]) { | |
108 | nr_entries += (bytes / pagesize[i]); | |
109 | bytes %= pagesize[i]; | |
110 | } | |
111 | } | |
112 | BUG_ON(bytes); | |
113 | ||
114 | return nr_entries; | |
115 | } | |
116 | ||
117 | /* allocate and initialize sg_table header(a kind of 'superblock') */ | |
118 | static struct sg_table *sgtable_alloc(const size_t bytes, u32 flags) | |
119 | { | |
120 | unsigned int nr_entries; | |
121 | int err; | |
122 | struct sg_table *sgt; | |
123 | ||
124 | if (!bytes) | |
125 | return ERR_PTR(-EINVAL); | |
126 | ||
127 | if (!IS_ALIGNED(bytes, PAGE_SIZE)) | |
128 | return ERR_PTR(-EINVAL); | |
129 | ||
130 | /* FIXME: IOVMF_DA_FIXED should support 'superpages' */ | |
131 | if ((flags & IOVMF_LINEAR) && (flags & IOVMF_DA_ANON)) { | |
132 | nr_entries = sgtable_nents(bytes); | |
133 | if (!nr_entries) | |
134 | return ERR_PTR(-EINVAL); | |
135 | } else | |
136 | nr_entries = bytes / PAGE_SIZE; | |
137 | ||
138 | sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); | |
139 | if (!sgt) | |
140 | return ERR_PTR(-ENOMEM); | |
141 | ||
142 | err = sg_alloc_table(sgt, nr_entries, GFP_KERNEL); | |
7f1225bd S |
143 | if (err) { |
144 | kfree(sgt); | |
69d3a84a | 145 | return ERR_PTR(err); |
7f1225bd | 146 | } |
69d3a84a HD |
147 | |
148 | pr_debug("%s: sgt:%p(%d entries)\n", __func__, sgt, nr_entries); | |
149 | ||
150 | return sgt; | |
151 | } | |
152 | ||
153 | /* free sg_table header(a kind of superblock) */ | |
154 | static void sgtable_free(struct sg_table *sgt) | |
155 | { | |
156 | if (!sgt) | |
157 | return; | |
158 | ||
159 | sg_free_table(sgt); | |
160 | kfree(sgt); | |
161 | ||
162 | pr_debug("%s: sgt:%p\n", __func__, sgt); | |
163 | } | |
164 | ||
165 | /* map 'sglist' to a contiguous mpu virtual area and return 'va' */ | |
166 | static void *vmap_sg(const struct sg_table *sgt) | |
167 | { | |
168 | u32 va; | |
169 | size_t total; | |
170 | unsigned int i; | |
171 | struct scatterlist *sg; | |
172 | struct vm_struct *new; | |
173 | const struct mem_type *mtype; | |
174 | ||
175 | mtype = get_mem_type(MT_DEVICE); | |
176 | if (!mtype) | |
177 | return ERR_PTR(-EINVAL); | |
178 | ||
179 | total = sgtable_len(sgt); | |
180 | if (!total) | |
181 | return ERR_PTR(-EINVAL); | |
182 | ||
183 | new = __get_vm_area(total, VM_IOREMAP, VMALLOC_START, VMALLOC_END); | |
184 | if (!new) | |
185 | return ERR_PTR(-ENOMEM); | |
186 | va = (u32)new->addr; | |
187 | ||
188 | for_each_sg(sgt->sgl, sg, sgt->nents, i) { | |
189 | size_t bytes; | |
190 | u32 pa; | |
191 | int err; | |
192 | ||
193 | pa = sg_phys(sg); | |
194 | bytes = sg_dma_len(sg); | |
195 | ||
196 | BUG_ON(bytes != PAGE_SIZE); | |
197 | ||
198 | err = ioremap_page(va, pa, mtype); | |
199 | if (err) | |
200 | goto err_out; | |
201 | ||
202 | va += bytes; | |
203 | } | |
204 | ||
6716bd06 SP |
205 | flush_cache_vmap((unsigned long)new->addr, |
206 | (unsigned long)(new->addr + total)); | |
69d3a84a HD |
207 | return new->addr; |
208 | ||
209 | err_out: | |
210 | WARN_ON(1); /* FIXME: cleanup some mpu mappings */ | |
211 | vunmap(new->addr); | |
212 | return ERR_PTR(-EAGAIN); | |
213 | } | |
214 | ||
215 | static inline void vunmap_sg(const void *va) | |
216 | { | |
217 | vunmap(va); | |
218 | } | |
219 | ||
220 | static struct iovm_struct *__find_iovm_area(struct iommu *obj, const u32 da) | |
221 | { | |
222 | struct iovm_struct *tmp; | |
223 | ||
224 | list_for_each_entry(tmp, &obj->mmap, list) { | |
225 | if ((da >= tmp->da_start) && (da < tmp->da_end)) { | |
226 | size_t len; | |
227 | ||
228 | len = tmp->da_end - tmp->da_start; | |
229 | ||
230 | dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n", | |
231 | __func__, tmp->da_start, da, tmp->da_end, len, | |
232 | tmp->flags); | |
233 | ||
234 | return tmp; | |
235 | } | |
236 | } | |
237 | ||
238 | return NULL; | |
239 | } | |
240 | ||
241 | /** | |
242 | * find_iovm_area - find iovma which includes @da | |
243 | * @da: iommu device virtual address | |
244 | * | |
245 | * Find the existing iovma starting at @da | |
246 | */ | |
247 | struct iovm_struct *find_iovm_area(struct iommu *obj, u32 da) | |
248 | { | |
249 | struct iovm_struct *area; | |
250 | ||
251 | mutex_lock(&obj->mmap_lock); | |
252 | area = __find_iovm_area(obj, da); | |
253 | mutex_unlock(&obj->mmap_lock); | |
254 | ||
255 | return area; | |
256 | } | |
257 | EXPORT_SYMBOL_GPL(find_iovm_area); | |
258 | ||
259 | /* | |
260 | * This finds the hole(area) which fits the requested address and len | |
261 | * in iovmas mmap, and returns the new allocated iovma. | |
262 | */ | |
263 | static struct iovm_struct *alloc_iovm_area(struct iommu *obj, u32 da, | |
264 | size_t bytes, u32 flags) | |
265 | { | |
266 | struct iovm_struct *new, *tmp; | |
267 | u32 start, prev_end, alignement; | |
268 | ||
269 | if (!obj || !bytes) | |
270 | return ERR_PTR(-EINVAL); | |
271 | ||
272 | start = da; | |
273 | alignement = PAGE_SIZE; | |
274 | ||
275 | if (flags & IOVMF_DA_ANON) { | |
276 | /* | |
277 | * Reserve the first page for NULL | |
278 | */ | |
279 | start = PAGE_SIZE; | |
280 | if (flags & IOVMF_LINEAR) | |
281 | alignement = iopgsz_max(bytes); | |
282 | start = roundup(start, alignement); | |
283 | } | |
284 | ||
285 | tmp = NULL; | |
286 | if (list_empty(&obj->mmap)) | |
287 | goto found; | |
288 | ||
289 | prev_end = 0; | |
290 | list_for_each_entry(tmp, &obj->mmap, list) { | |
291 | ||
e0a42e4f HD |
292 | if (prev_end >= start) |
293 | break; | |
294 | ||
295 | if (start + bytes < tmp->da_start) | |
69d3a84a HD |
296 | goto found; |
297 | ||
298 | if (flags & IOVMF_DA_ANON) | |
fa460b88 | 299 | start = roundup(tmp->da_end + 1, alignement); |
69d3a84a HD |
300 | |
301 | prev_end = tmp->da_end; | |
302 | } | |
303 | ||
fa460b88 | 304 | if ((start > prev_end) && (ULONG_MAX - start >= bytes)) |
69d3a84a HD |
305 | goto found; |
306 | ||
307 | dev_dbg(obj->dev, "%s: no space to fit %08x(%x) flags: %08x\n", | |
308 | __func__, da, bytes, flags); | |
309 | ||
310 | return ERR_PTR(-EINVAL); | |
311 | ||
312 | found: | |
313 | new = kmem_cache_zalloc(iovm_area_cachep, GFP_KERNEL); | |
314 | if (!new) | |
315 | return ERR_PTR(-ENOMEM); | |
316 | ||
317 | new->iommu = obj; | |
318 | new->da_start = start; | |
319 | new->da_end = start + bytes; | |
320 | new->flags = flags; | |
321 | ||
322 | /* | |
323 | * keep ascending order of iovmas | |
324 | */ | |
325 | if (tmp) | |
326 | list_add_tail(&new->list, &tmp->list); | |
327 | else | |
328 | list_add(&new->list, &obj->mmap); | |
329 | ||
330 | dev_dbg(obj->dev, "%s: found %08x-%08x-%08x(%x) %08x\n", | |
331 | __func__, new->da_start, start, new->da_end, bytes, flags); | |
332 | ||
333 | return new; | |
334 | } | |
335 | ||
336 | static void free_iovm_area(struct iommu *obj, struct iovm_struct *area) | |
337 | { | |
338 | size_t bytes; | |
339 | ||
340 | BUG_ON(!obj || !area); | |
341 | ||
342 | bytes = area->da_end - area->da_start; | |
343 | ||
344 | dev_dbg(obj->dev, "%s: %08x-%08x(%x) %08x\n", | |
345 | __func__, area->da_start, area->da_end, bytes, area->flags); | |
346 | ||
347 | list_del(&area->list); | |
348 | kmem_cache_free(iovm_area_cachep, area); | |
349 | } | |
350 | ||
351 | /** | |
352 | * da_to_va - convert (d) to (v) | |
353 | * @obj: objective iommu | |
354 | * @da: iommu device virtual address | |
355 | * @va: mpu virtual address | |
356 | * | |
357 | * Returns mpu virtual addr which corresponds to a given device virtual addr | |
358 | */ | |
359 | void *da_to_va(struct iommu *obj, u32 da) | |
360 | { | |
361 | void *va = NULL; | |
362 | struct iovm_struct *area; | |
363 | ||
364 | mutex_lock(&obj->mmap_lock); | |
365 | ||
366 | area = __find_iovm_area(obj, da); | |
367 | if (!area) { | |
368 | dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da); | |
369 | goto out; | |
370 | } | |
371 | va = area->va; | |
69d3a84a | 372 | out: |
26548900 DW |
373 | mutex_unlock(&obj->mmap_lock); |
374 | ||
69d3a84a HD |
375 | return va; |
376 | } | |
377 | EXPORT_SYMBOL_GPL(da_to_va); | |
378 | ||
379 | static void sgtable_fill_vmalloc(struct sg_table *sgt, void *_va) | |
380 | { | |
381 | unsigned int i; | |
382 | struct scatterlist *sg; | |
383 | void *va = _va; | |
384 | void *va_end; | |
385 | ||
386 | for_each_sg(sgt->sgl, sg, sgt->nents, i) { | |
387 | struct page *pg; | |
388 | const size_t bytes = PAGE_SIZE; | |
389 | ||
390 | /* | |
391 | * iommu 'superpage' isn't supported with 'iommu_vmalloc()' | |
392 | */ | |
393 | pg = vmalloc_to_page(va); | |
394 | BUG_ON(!pg); | |
395 | sg_set_page(sg, pg, bytes, 0); | |
396 | ||
397 | va += bytes; | |
398 | } | |
399 | ||
400 | va_end = _va + PAGE_SIZE * i; | |
69d3a84a HD |
401 | } |
402 | ||
403 | static inline void sgtable_drain_vmalloc(struct sg_table *sgt) | |
404 | { | |
405 | /* | |
406 | * Actually this is not necessary at all, just exists for | |
ba6a1179 | 407 | * consistency of the code readability. |
69d3a84a HD |
408 | */ |
409 | BUG_ON(!sgt); | |
410 | } | |
411 | ||
412 | static void sgtable_fill_kmalloc(struct sg_table *sgt, u32 pa, size_t len) | |
413 | { | |
414 | unsigned int i; | |
415 | struct scatterlist *sg; | |
416 | void *va; | |
417 | ||
418 | va = phys_to_virt(pa); | |
419 | ||
420 | for_each_sg(sgt->sgl, sg, sgt->nents, i) { | |
421 | size_t bytes; | |
422 | ||
423 | bytes = iopgsz_max(len); | |
424 | ||
425 | BUG_ON(!iopgsz_ok(bytes)); | |
426 | ||
427 | sg_set_buf(sg, phys_to_virt(pa), bytes); | |
428 | /* | |
429 | * 'pa' is cotinuous(linear). | |
430 | */ | |
431 | pa += bytes; | |
432 | len -= bytes; | |
433 | } | |
434 | BUG_ON(len); | |
69d3a84a HD |
435 | } |
436 | ||
437 | static inline void sgtable_drain_kmalloc(struct sg_table *sgt) | |
438 | { | |
439 | /* | |
440 | * Actually this is not necessary at all, just exists for | |
ba6a1179 | 441 | * consistency of the code readability |
69d3a84a HD |
442 | */ |
443 | BUG_ON(!sgt); | |
444 | } | |
445 | ||
446 | /* create 'da' <-> 'pa' mapping from 'sgt' */ | |
447 | static int map_iovm_area(struct iommu *obj, struct iovm_struct *new, | |
448 | const struct sg_table *sgt, u32 flags) | |
449 | { | |
450 | int err; | |
451 | unsigned int i, j; | |
452 | struct scatterlist *sg; | |
453 | u32 da = new->da_start; | |
454 | ||
20e11c2d | 455 | if (!obj || !sgt) |
69d3a84a HD |
456 | return -EINVAL; |
457 | ||
458 | BUG_ON(!sgtable_ok(sgt)); | |
459 | ||
460 | for_each_sg(sgt->sgl, sg, sgt->nents, i) { | |
461 | u32 pa; | |
462 | int pgsz; | |
463 | size_t bytes; | |
464 | struct iotlb_entry e; | |
465 | ||
466 | pa = sg_phys(sg); | |
467 | bytes = sg_dma_len(sg); | |
468 | ||
469 | flags &= ~IOVMF_PGSZ_MASK; | |
470 | pgsz = bytes_to_iopgsz(bytes); | |
471 | if (pgsz < 0) | |
472 | goto err_out; | |
473 | flags |= pgsz; | |
474 | ||
475 | pr_debug("%s: [%d] %08x %08x(%x)\n", __func__, | |
476 | i, da, pa, bytes); | |
477 | ||
478 | iotlb_init_entry(&e, da, pa, flags); | |
479 | err = iopgtable_store_entry(obj, &e); | |
480 | if (err) | |
481 | goto err_out; | |
482 | ||
483 | da += bytes; | |
484 | } | |
485 | return 0; | |
486 | ||
487 | err_out: | |
488 | da = new->da_start; | |
489 | ||
490 | for_each_sg(sgt->sgl, sg, i, j) { | |
491 | size_t bytes; | |
492 | ||
493 | bytes = iopgtable_clear_entry(obj, da); | |
494 | ||
495 | BUG_ON(!iopgsz_ok(bytes)); | |
496 | ||
497 | da += bytes; | |
498 | } | |
499 | return err; | |
500 | } | |
501 | ||
502 | /* release 'da' <-> 'pa' mapping */ | |
503 | static void unmap_iovm_area(struct iommu *obj, struct iovm_struct *area) | |
504 | { | |
505 | u32 start; | |
506 | size_t total = area->da_end - area->da_start; | |
507 | ||
508 | BUG_ON((!total) || !IS_ALIGNED(total, PAGE_SIZE)); | |
509 | ||
510 | start = area->da_start; | |
511 | while (total > 0) { | |
512 | size_t bytes; | |
513 | ||
514 | bytes = iopgtable_clear_entry(obj, start); | |
515 | if (bytes == 0) | |
516 | bytes = PAGE_SIZE; | |
517 | else | |
518 | dev_dbg(obj->dev, "%s: unmap %08x(%x) %08x\n", | |
519 | __func__, start, bytes, area->flags); | |
520 | ||
521 | BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE)); | |
522 | ||
523 | total -= bytes; | |
524 | start += bytes; | |
525 | } | |
526 | BUG_ON(total); | |
527 | } | |
528 | ||
529 | /* template function for all unmapping */ | |
530 | static struct sg_table *unmap_vm_area(struct iommu *obj, const u32 da, | |
531 | void (*fn)(const void *), u32 flags) | |
532 | { | |
533 | struct sg_table *sgt = NULL; | |
534 | struct iovm_struct *area; | |
535 | ||
536 | if (!IS_ALIGNED(da, PAGE_SIZE)) { | |
537 | dev_err(obj->dev, "%s: alignment err(%08x)\n", __func__, da); | |
538 | return NULL; | |
539 | } | |
540 | ||
541 | mutex_lock(&obj->mmap_lock); | |
542 | ||
543 | area = __find_iovm_area(obj, da); | |
544 | if (!area) { | |
545 | dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da); | |
546 | goto out; | |
547 | } | |
548 | ||
549 | if ((area->flags & flags) != flags) { | |
550 | dev_err(obj->dev, "%s: wrong flags(%08x)\n", __func__, | |
551 | area->flags); | |
552 | goto out; | |
553 | } | |
554 | sgt = (struct sg_table *)area->sgt; | |
555 | ||
556 | unmap_iovm_area(obj, area); | |
557 | ||
558 | fn(area->va); | |
559 | ||
560 | dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n", __func__, | |
561 | area->da_start, da, area->da_end, | |
562 | area->da_end - area->da_start, area->flags); | |
563 | ||
564 | free_iovm_area(obj, area); | |
565 | out: | |
566 | mutex_unlock(&obj->mmap_lock); | |
567 | ||
568 | return sgt; | |
569 | } | |
570 | ||
571 | static u32 map_iommu_region(struct iommu *obj, u32 da, | |
572 | const struct sg_table *sgt, void *va, size_t bytes, u32 flags) | |
573 | { | |
574 | int err = -ENOMEM; | |
575 | struct iovm_struct *new; | |
576 | ||
577 | mutex_lock(&obj->mmap_lock); | |
578 | ||
579 | new = alloc_iovm_area(obj, da, bytes, flags); | |
580 | if (IS_ERR(new)) { | |
581 | err = PTR_ERR(new); | |
582 | goto err_alloc_iovma; | |
583 | } | |
584 | new->va = va; | |
585 | new->sgt = sgt; | |
586 | ||
587 | if (map_iovm_area(obj, new, sgt, new->flags)) | |
588 | goto err_map; | |
589 | ||
590 | mutex_unlock(&obj->mmap_lock); | |
591 | ||
592 | dev_dbg(obj->dev, "%s: da:%08x(%x) flags:%08x va:%p\n", | |
593 | __func__, new->da_start, bytes, new->flags, va); | |
594 | ||
595 | return new->da_start; | |
596 | ||
597 | err_map: | |
598 | free_iovm_area(obj, new); | |
599 | err_alloc_iovma: | |
600 | mutex_unlock(&obj->mmap_lock); | |
601 | return err; | |
602 | } | |
603 | ||
604 | static inline u32 __iommu_vmap(struct iommu *obj, u32 da, | |
605 | const struct sg_table *sgt, void *va, size_t bytes, u32 flags) | |
606 | { | |
607 | return map_iommu_region(obj, da, sgt, va, bytes, flags); | |
608 | } | |
609 | ||
610 | /** | |
611 | * iommu_vmap - (d)-(p)-(v) address mapper | |
612 | * @obj: objective iommu | |
613 | * @sgt: address of scatter gather table | |
614 | * @flags: iovma and page property | |
615 | * | |
616 | * Creates 1-n-1 mapping with given @sgt and returns @da. | |
617 | * All @sgt element must be io page size aligned. | |
618 | */ | |
619 | u32 iommu_vmap(struct iommu *obj, u32 da, const struct sg_table *sgt, | |
620 | u32 flags) | |
621 | { | |
622 | size_t bytes; | |
935e4739 | 623 | void *va = NULL; |
69d3a84a HD |
624 | |
625 | if (!obj || !obj->dev || !sgt) | |
626 | return -EINVAL; | |
627 | ||
628 | bytes = sgtable_len(sgt); | |
629 | if (!bytes) | |
630 | return -EINVAL; | |
631 | bytes = PAGE_ALIGN(bytes); | |
632 | ||
935e4739 HD |
633 | if (flags & IOVMF_MMIO) { |
634 | va = vmap_sg(sgt); | |
635 | if (IS_ERR(va)) | |
636 | return PTR_ERR(va); | |
637 | } | |
69d3a84a HD |
638 | |
639 | flags &= IOVMF_HW_MASK; | |
640 | flags |= IOVMF_DISCONT; | |
641 | flags |= IOVMF_MMIO; | |
642 | flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON); | |
643 | ||
644 | da = __iommu_vmap(obj, da, sgt, va, bytes, flags); | |
645 | if (IS_ERR_VALUE(da)) | |
646 | vunmap_sg(va); | |
647 | ||
648 | return da; | |
649 | } | |
650 | EXPORT_SYMBOL_GPL(iommu_vmap); | |
651 | ||
652 | /** | |
653 | * iommu_vunmap - release virtual mapping obtained by 'iommu_vmap()' | |
654 | * @obj: objective iommu | |
655 | * @da: iommu device virtual address | |
656 | * | |
657 | * Free the iommu virtually contiguous memory area starting at | |
658 | * @da, which was returned by 'iommu_vmap()'. | |
659 | */ | |
660 | struct sg_table *iommu_vunmap(struct iommu *obj, u32 da) | |
661 | { | |
662 | struct sg_table *sgt; | |
663 | /* | |
664 | * 'sgt' is allocated before 'iommu_vmalloc()' is called. | |
665 | * Just returns 'sgt' to the caller to free | |
666 | */ | |
667 | sgt = unmap_vm_area(obj, da, vunmap_sg, IOVMF_DISCONT | IOVMF_MMIO); | |
668 | if (!sgt) | |
669 | dev_dbg(obj->dev, "%s: No sgt\n", __func__); | |
670 | return sgt; | |
671 | } | |
672 | EXPORT_SYMBOL_GPL(iommu_vunmap); | |
673 | ||
674 | /** | |
675 | * iommu_vmalloc - (d)-(p)-(v) address allocator and mapper | |
676 | * @obj: objective iommu | |
677 | * @da: contiguous iommu virtual memory | |
678 | * @bytes: allocation size | |
679 | * @flags: iovma and page property | |
680 | * | |
681 | * Allocate @bytes linearly and creates 1-n-1 mapping and returns | |
682 | * @da again, which might be adjusted if 'IOVMF_DA_ANON' is set. | |
683 | */ | |
684 | u32 iommu_vmalloc(struct iommu *obj, u32 da, size_t bytes, u32 flags) | |
685 | { | |
686 | void *va; | |
687 | struct sg_table *sgt; | |
688 | ||
689 | if (!obj || !obj->dev || !bytes) | |
690 | return -EINVAL; | |
691 | ||
692 | bytes = PAGE_ALIGN(bytes); | |
693 | ||
694 | va = vmalloc(bytes); | |
695 | if (!va) | |
696 | return -ENOMEM; | |
697 | ||
698 | sgt = sgtable_alloc(bytes, flags); | |
699 | if (IS_ERR(sgt)) { | |
700 | da = PTR_ERR(sgt); | |
701 | goto err_sgt_alloc; | |
702 | } | |
703 | sgtable_fill_vmalloc(sgt, va); | |
704 | ||
705 | flags &= IOVMF_HW_MASK; | |
706 | flags |= IOVMF_DISCONT; | |
707 | flags |= IOVMF_ALLOC; | |
708 | flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON); | |
709 | ||
710 | da = __iommu_vmap(obj, da, sgt, va, bytes, flags); | |
711 | if (IS_ERR_VALUE(da)) | |
712 | goto err_iommu_vmap; | |
713 | ||
714 | return da; | |
715 | ||
716 | err_iommu_vmap: | |
717 | sgtable_drain_vmalloc(sgt); | |
718 | sgtable_free(sgt); | |
719 | err_sgt_alloc: | |
720 | vfree(va); | |
721 | return da; | |
722 | } | |
723 | EXPORT_SYMBOL_GPL(iommu_vmalloc); | |
724 | ||
725 | /** | |
726 | * iommu_vfree - release memory allocated by 'iommu_vmalloc()' | |
727 | * @obj: objective iommu | |
728 | * @da: iommu device virtual address | |
729 | * | |
730 | * Frees the iommu virtually continuous memory area starting at | |
731 | * @da, as obtained from 'iommu_vmalloc()'. | |
732 | */ | |
733 | void iommu_vfree(struct iommu *obj, const u32 da) | |
734 | { | |
735 | struct sg_table *sgt; | |
736 | ||
737 | sgt = unmap_vm_area(obj, da, vfree, IOVMF_DISCONT | IOVMF_ALLOC); | |
738 | if (!sgt) | |
739 | dev_dbg(obj->dev, "%s: No sgt\n", __func__); | |
740 | sgtable_free(sgt); | |
741 | } | |
742 | EXPORT_SYMBOL_GPL(iommu_vfree); | |
743 | ||
744 | static u32 __iommu_kmap(struct iommu *obj, u32 da, u32 pa, void *va, | |
745 | size_t bytes, u32 flags) | |
746 | { | |
747 | struct sg_table *sgt; | |
748 | ||
749 | sgt = sgtable_alloc(bytes, flags); | |
750 | if (IS_ERR(sgt)) | |
751 | return PTR_ERR(sgt); | |
752 | ||
753 | sgtable_fill_kmalloc(sgt, pa, bytes); | |
754 | ||
755 | da = map_iommu_region(obj, da, sgt, va, bytes, flags); | |
756 | if (IS_ERR_VALUE(da)) { | |
757 | sgtable_drain_kmalloc(sgt); | |
758 | sgtable_free(sgt); | |
759 | } | |
760 | ||
761 | return da; | |
762 | } | |
763 | ||
764 | /** | |
765 | * iommu_kmap - (d)-(p)-(v) address mapper | |
766 | * @obj: objective iommu | |
767 | * @da: contiguous iommu virtual memory | |
768 | * @pa: contiguous physical memory | |
769 | * @flags: iovma and page property | |
770 | * | |
771 | * Creates 1-1-1 mapping and returns @da again, which can be | |
772 | * adjusted if 'IOVMF_DA_ANON' is set. | |
773 | */ | |
774 | u32 iommu_kmap(struct iommu *obj, u32 da, u32 pa, size_t bytes, | |
775 | u32 flags) | |
776 | { | |
777 | void *va; | |
778 | ||
779 | if (!obj || !obj->dev || !bytes) | |
780 | return -EINVAL; | |
781 | ||
782 | bytes = PAGE_ALIGN(bytes); | |
783 | ||
784 | va = ioremap(pa, bytes); | |
785 | if (!va) | |
786 | return -ENOMEM; | |
787 | ||
788 | flags &= IOVMF_HW_MASK; | |
789 | flags |= IOVMF_LINEAR; | |
790 | flags |= IOVMF_MMIO; | |
791 | flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON); | |
792 | ||
793 | da = __iommu_kmap(obj, da, pa, va, bytes, flags); | |
794 | if (IS_ERR_VALUE(da)) | |
795 | iounmap(va); | |
796 | ||
797 | return da; | |
798 | } | |
799 | EXPORT_SYMBOL_GPL(iommu_kmap); | |
800 | ||
801 | /** | |
802 | * iommu_kunmap - release virtual mapping obtained by 'iommu_kmap()' | |
803 | * @obj: objective iommu | |
804 | * @da: iommu device virtual address | |
805 | * | |
806 | * Frees the iommu virtually contiguous memory area starting at | |
807 | * @da, which was passed to and was returned by'iommu_kmap()'. | |
808 | */ | |
809 | void iommu_kunmap(struct iommu *obj, u32 da) | |
810 | { | |
811 | struct sg_table *sgt; | |
812 | typedef void (*func_t)(const void *); | |
813 | ||
814 | sgt = unmap_vm_area(obj, da, (func_t)__iounmap, | |
815 | IOVMF_LINEAR | IOVMF_MMIO); | |
816 | if (!sgt) | |
817 | dev_dbg(obj->dev, "%s: No sgt\n", __func__); | |
818 | sgtable_free(sgt); | |
819 | } | |
820 | EXPORT_SYMBOL_GPL(iommu_kunmap); | |
821 | ||
822 | /** | |
823 | * iommu_kmalloc - (d)-(p)-(v) address allocator and mapper | |
824 | * @obj: objective iommu | |
825 | * @da: contiguous iommu virtual memory | |
826 | * @bytes: bytes for allocation | |
827 | * @flags: iovma and page property | |
828 | * | |
829 | * Allocate @bytes linearly and creates 1-1-1 mapping and returns | |
830 | * @da again, which might be adjusted if 'IOVMF_DA_ANON' is set. | |
831 | */ | |
832 | u32 iommu_kmalloc(struct iommu *obj, u32 da, size_t bytes, u32 flags) | |
833 | { | |
834 | void *va; | |
835 | u32 pa; | |
836 | ||
837 | if (!obj || !obj->dev || !bytes) | |
838 | return -EINVAL; | |
839 | ||
840 | bytes = PAGE_ALIGN(bytes); | |
841 | ||
842 | va = kmalloc(bytes, GFP_KERNEL | GFP_DMA); | |
843 | if (!va) | |
844 | return -ENOMEM; | |
845 | pa = virt_to_phys(va); | |
846 | ||
847 | flags &= IOVMF_HW_MASK; | |
848 | flags |= IOVMF_LINEAR; | |
849 | flags |= IOVMF_ALLOC; | |
850 | flags |= (da ? IOVMF_DA_FIXED : IOVMF_DA_ANON); | |
851 | ||
852 | da = __iommu_kmap(obj, da, pa, va, bytes, flags); | |
853 | if (IS_ERR_VALUE(da)) | |
854 | kfree(va); | |
855 | ||
856 | return da; | |
857 | } | |
858 | EXPORT_SYMBOL_GPL(iommu_kmalloc); | |
859 | ||
860 | /** | |
861 | * iommu_kfree - release virtual mapping obtained by 'iommu_kmalloc()' | |
862 | * @obj: objective iommu | |
863 | * @da: iommu device virtual address | |
864 | * | |
865 | * Frees the iommu virtually contiguous memory area starting at | |
866 | * @da, which was passed to and was returned by'iommu_kmalloc()'. | |
867 | */ | |
868 | void iommu_kfree(struct iommu *obj, u32 da) | |
869 | { | |
870 | struct sg_table *sgt; | |
871 | ||
872 | sgt = unmap_vm_area(obj, da, kfree, IOVMF_LINEAR | IOVMF_ALLOC); | |
873 | if (!sgt) | |
874 | dev_dbg(obj->dev, "%s: No sgt\n", __func__); | |
875 | sgtable_free(sgt); | |
876 | } | |
877 | EXPORT_SYMBOL_GPL(iommu_kfree); | |
878 | ||
879 | ||
880 | static int __init iovmm_init(void) | |
881 | { | |
882 | const unsigned long flags = SLAB_HWCACHE_ALIGN; | |
883 | struct kmem_cache *p; | |
884 | ||
885 | p = kmem_cache_create("iovm_area_cache", sizeof(struct iovm_struct), 0, | |
886 | flags, NULL); | |
887 | if (!p) | |
888 | return -ENOMEM; | |
889 | iovm_area_cachep = p; | |
890 | ||
891 | return 0; | |
892 | } | |
893 | module_init(iovmm_init); | |
894 | ||
895 | static void __exit iovmm_exit(void) | |
896 | { | |
897 | kmem_cache_destroy(iovm_area_cachep); | |
898 | } | |
899 | module_exit(iovmm_exit); | |
900 | ||
901 | MODULE_DESCRIPTION("omap iommu: simple virtual address space management"); | |
902 | MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>"); | |
903 | MODULE_LICENSE("GPL v2"); |