Commit | Line | Data |
---|---|---|
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> | |
f626b52d | 18 | #include <linux/iommu.h> |
69d3a84a HD |
19 | |
20 | #include <asm/cacheflush.h> | |
21 | #include <asm/mach/map.h> | |
22 | ||
ce491cf8 TL |
23 | #include <plat/iommu.h> |
24 | #include <plat/iovmm.h> | |
69d3a84a | 25 | |
fcf3a6ef | 26 | #include <plat/iopgtable.h> |
69d3a84a | 27 | |
69d3a84a HD |
28 | static struct kmem_cache *iovm_area_cachep; |
29 | ||
329d8d3b LP |
30 | /* return the offset of the first scatterlist entry in a sg table */ |
31 | static unsigned int sgtable_offset(const struct sg_table *sgt) | |
32 | { | |
33 | if (!sgt || !sgt->nents) | |
34 | return 0; | |
35 | ||
36 | return sgt->sgl->offset; | |
37 | } | |
38 | ||
69d3a84a HD |
39 | /* return total bytes of sg buffers */ |
40 | static size_t sgtable_len(const struct sg_table *sgt) | |
41 | { | |
42 | unsigned int i, total = 0; | |
43 | struct scatterlist *sg; | |
44 | ||
45 | if (!sgt) | |
46 | return 0; | |
47 | ||
48 | for_each_sg(sgt->sgl, sg, sgt->nents, i) { | |
49 | size_t bytes; | |
50 | ||
329d8d3b | 51 | bytes = sg->length + sg->offset; |
69d3a84a HD |
52 | |
53 | if (!iopgsz_ok(bytes)) { | |
329d8d3b LP |
54 | pr_err("%s: sg[%d] not iommu pagesize(%u %u)\n", |
55 | __func__, i, bytes, sg->offset); | |
56 | return 0; | |
57 | } | |
58 | ||
59 | if (i && sg->offset) { | |
60 | pr_err("%s: sg[%d] offset not allowed in internal " | |
61 | "entries\n", __func__, i); | |
69d3a84a HD |
62 | return 0; |
63 | } | |
64 | ||
65 | total += bytes; | |
66 | } | |
67 | ||
68 | return total; | |
69 | } | |
70 | #define sgtable_ok(x) (!!sgtable_len(x)) | |
71 | ||
ad108121 GLF |
72 | static unsigned max_alignment(u32 addr) |
73 | { | |
74 | int i; | |
75 | unsigned pagesize[] = { SZ_16M, SZ_1M, SZ_64K, SZ_4K, }; | |
76 | for (i = 0; i < ARRAY_SIZE(pagesize) && addr & (pagesize[i] - 1); i++) | |
77 | ; | |
78 | return (i < ARRAY_SIZE(pagesize)) ? pagesize[i] : 0; | |
79 | } | |
80 | ||
69d3a84a HD |
81 | /* |
82 | * calculate the optimal number sg elements from total bytes based on | |
83 | * iommu superpages | |
84 | */ | |
ad108121 | 85 | static unsigned sgtable_nents(size_t bytes, u32 da, u32 pa) |
69d3a84a | 86 | { |
ad108121 | 87 | unsigned nr_entries = 0, ent_sz; |
69d3a84a HD |
88 | |
89 | if (!IS_ALIGNED(bytes, PAGE_SIZE)) { | |
90 | pr_err("%s: wrong size %08x\n", __func__, bytes); | |
91 | return 0; | |
92 | } | |
93 | ||
ad108121 GLF |
94 | while (bytes) { |
95 | ent_sz = max_alignment(da | pa); | |
96 | ent_sz = min_t(unsigned, ent_sz, iopgsz_max(bytes)); | |
97 | nr_entries++; | |
98 | da += ent_sz; | |
99 | pa += ent_sz; | |
100 | bytes -= ent_sz; | |
69d3a84a | 101 | } |
69d3a84a HD |
102 | |
103 | return nr_entries; | |
104 | } | |
105 | ||
106 | /* allocate and initialize sg_table header(a kind of 'superblock') */ | |
ad108121 GLF |
107 | static struct sg_table *sgtable_alloc(const size_t bytes, u32 flags, |
108 | u32 da, u32 pa) | |
69d3a84a HD |
109 | { |
110 | unsigned int nr_entries; | |
111 | int err; | |
112 | struct sg_table *sgt; | |
113 | ||
114 | if (!bytes) | |
115 | return ERR_PTR(-EINVAL); | |
116 | ||
117 | if (!IS_ALIGNED(bytes, PAGE_SIZE)) | |
118 | return ERR_PTR(-EINVAL); | |
119 | ||
ad108121 GLF |
120 | if (flags & IOVMF_LINEAR) { |
121 | nr_entries = sgtable_nents(bytes, da, pa); | |
69d3a84a HD |
122 | if (!nr_entries) |
123 | return ERR_PTR(-EINVAL); | |
124 | } else | |
125 | nr_entries = bytes / PAGE_SIZE; | |
126 | ||
127 | sgt = kzalloc(sizeof(*sgt), GFP_KERNEL); | |
128 | if (!sgt) | |
129 | return ERR_PTR(-ENOMEM); | |
130 | ||
131 | err = sg_alloc_table(sgt, nr_entries, GFP_KERNEL); | |
7f1225bd S |
132 | if (err) { |
133 | kfree(sgt); | |
69d3a84a | 134 | return ERR_PTR(err); |
7f1225bd | 135 | } |
69d3a84a HD |
136 | |
137 | pr_debug("%s: sgt:%p(%d entries)\n", __func__, sgt, nr_entries); | |
138 | ||
139 | return sgt; | |
140 | } | |
141 | ||
142 | /* free sg_table header(a kind of superblock) */ | |
143 | static void sgtable_free(struct sg_table *sgt) | |
144 | { | |
145 | if (!sgt) | |
146 | return; | |
147 | ||
148 | sg_free_table(sgt); | |
149 | kfree(sgt); | |
150 | ||
151 | pr_debug("%s: sgt:%p\n", __func__, sgt); | |
152 | } | |
153 | ||
154 | /* map 'sglist' to a contiguous mpu virtual area and return 'va' */ | |
155 | static void *vmap_sg(const struct sg_table *sgt) | |
156 | { | |
157 | u32 va; | |
158 | size_t total; | |
159 | unsigned int i; | |
160 | struct scatterlist *sg; | |
161 | struct vm_struct *new; | |
162 | const struct mem_type *mtype; | |
163 | ||
164 | mtype = get_mem_type(MT_DEVICE); | |
165 | if (!mtype) | |
166 | return ERR_PTR(-EINVAL); | |
167 | ||
168 | total = sgtable_len(sgt); | |
169 | if (!total) | |
170 | return ERR_PTR(-EINVAL); | |
171 | ||
172 | new = __get_vm_area(total, VM_IOREMAP, VMALLOC_START, VMALLOC_END); | |
173 | if (!new) | |
174 | return ERR_PTR(-ENOMEM); | |
175 | va = (u32)new->addr; | |
176 | ||
177 | for_each_sg(sgt->sgl, sg, sgt->nents, i) { | |
178 | size_t bytes; | |
179 | u32 pa; | |
180 | int err; | |
181 | ||
329d8d3b LP |
182 | pa = sg_phys(sg) - sg->offset; |
183 | bytes = sg->length + sg->offset; | |
69d3a84a HD |
184 | |
185 | BUG_ON(bytes != PAGE_SIZE); | |
186 | ||
187 | err = ioremap_page(va, pa, mtype); | |
188 | if (err) | |
189 | goto err_out; | |
190 | ||
191 | va += bytes; | |
192 | } | |
193 | ||
6716bd06 SP |
194 | flush_cache_vmap((unsigned long)new->addr, |
195 | (unsigned long)(new->addr + total)); | |
69d3a84a HD |
196 | return new->addr; |
197 | ||
198 | err_out: | |
199 | WARN_ON(1); /* FIXME: cleanup some mpu mappings */ | |
200 | vunmap(new->addr); | |
201 | return ERR_PTR(-EAGAIN); | |
202 | } | |
203 | ||
204 | static inline void vunmap_sg(const void *va) | |
205 | { | |
206 | vunmap(va); | |
207 | } | |
208 | ||
6c32df43 OBC |
209 | static struct iovm_struct *__find_iovm_area(struct omap_iommu *obj, |
210 | const u32 da) | |
69d3a84a HD |
211 | { |
212 | struct iovm_struct *tmp; | |
213 | ||
214 | list_for_each_entry(tmp, &obj->mmap, list) { | |
215 | if ((da >= tmp->da_start) && (da < tmp->da_end)) { | |
216 | size_t len; | |
217 | ||
218 | len = tmp->da_end - tmp->da_start; | |
219 | ||
220 | dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n", | |
221 | __func__, tmp->da_start, da, tmp->da_end, len, | |
222 | tmp->flags); | |
223 | ||
224 | return tmp; | |
225 | } | |
226 | } | |
227 | ||
228 | return NULL; | |
229 | } | |
230 | ||
231 | /** | |
6c32df43 | 232 | * omap_find_iovm_area - find iovma which includes @da |
69d3a84a HD |
233 | * @da: iommu device virtual address |
234 | * | |
235 | * Find the existing iovma starting at @da | |
236 | */ | |
6c32df43 | 237 | struct iovm_struct *omap_find_iovm_area(struct omap_iommu *obj, u32 da) |
69d3a84a HD |
238 | { |
239 | struct iovm_struct *area; | |
240 | ||
241 | mutex_lock(&obj->mmap_lock); | |
242 | area = __find_iovm_area(obj, da); | |
243 | mutex_unlock(&obj->mmap_lock); | |
244 | ||
245 | return area; | |
246 | } | |
6c32df43 | 247 | EXPORT_SYMBOL_GPL(omap_find_iovm_area); |
69d3a84a HD |
248 | |
249 | /* | |
250 | * This finds the hole(area) which fits the requested address and len | |
251 | * in iovmas mmap, and returns the new allocated iovma. | |
252 | */ | |
6c32df43 | 253 | static struct iovm_struct *alloc_iovm_area(struct omap_iommu *obj, u32 da, |
69d3a84a HD |
254 | size_t bytes, u32 flags) |
255 | { | |
256 | struct iovm_struct *new, *tmp; | |
4359d38d | 257 | u32 start, prev_end, alignment; |
69d3a84a HD |
258 | |
259 | if (!obj || !bytes) | |
260 | return ERR_PTR(-EINVAL); | |
261 | ||
262 | start = da; | |
4359d38d | 263 | alignment = PAGE_SIZE; |
69d3a84a | 264 | |
d038aee2 | 265 | if (~flags & IOVMF_DA_FIXED) { |
4359d38d MJ |
266 | /* Don't map address 0 */ |
267 | start = obj->da_start ? obj->da_start : alignment; | |
c7f4ab26 | 268 | |
69d3a84a | 269 | if (flags & IOVMF_LINEAR) |
4359d38d MJ |
270 | alignment = iopgsz_max(bytes); |
271 | start = roundup(start, alignment); | |
c7f4ab26 GLF |
272 | } else if (start < obj->da_start || start > obj->da_end || |
273 | obj->da_end - start < bytes) { | |
274 | return ERR_PTR(-EINVAL); | |
69d3a84a HD |
275 | } |
276 | ||
277 | tmp = NULL; | |
278 | if (list_empty(&obj->mmap)) | |
279 | goto found; | |
280 | ||
281 | prev_end = 0; | |
282 | list_for_each_entry(tmp, &obj->mmap, list) { | |
283 | ||
ba6e1f4f | 284 | if (prev_end > start) |
e0a42e4f HD |
285 | break; |
286 | ||
c7f4ab26 | 287 | if (tmp->da_start > start && (tmp->da_start - start) >= bytes) |
69d3a84a HD |
288 | goto found; |
289 | ||
d038aee2 | 290 | if (tmp->da_end >= start && ~flags & IOVMF_DA_FIXED) |
4359d38d | 291 | start = roundup(tmp->da_end + 1, alignment); |
69d3a84a HD |
292 | |
293 | prev_end = tmp->da_end; | |
294 | } | |
295 | ||
c7f4ab26 | 296 | if ((start >= prev_end) && (obj->da_end - start >= bytes)) |
69d3a84a HD |
297 | goto found; |
298 | ||
299 | dev_dbg(obj->dev, "%s: no space to fit %08x(%x) flags: %08x\n", | |
300 | __func__, da, bytes, flags); | |
301 | ||
302 | return ERR_PTR(-EINVAL); | |
303 | ||
304 | found: | |
305 | new = kmem_cache_zalloc(iovm_area_cachep, GFP_KERNEL); | |
306 | if (!new) | |
307 | return ERR_PTR(-ENOMEM); | |
308 | ||
309 | new->iommu = obj; | |
310 | new->da_start = start; | |
311 | new->da_end = start + bytes; | |
312 | new->flags = flags; | |
313 | ||
314 | /* | |
315 | * keep ascending order of iovmas | |
316 | */ | |
317 | if (tmp) | |
318 | list_add_tail(&new->list, &tmp->list); | |
319 | else | |
320 | list_add(&new->list, &obj->mmap); | |
321 | ||
322 | dev_dbg(obj->dev, "%s: found %08x-%08x-%08x(%x) %08x\n", | |
323 | __func__, new->da_start, start, new->da_end, bytes, flags); | |
324 | ||
325 | return new; | |
326 | } | |
327 | ||
6c32df43 | 328 | static void free_iovm_area(struct omap_iommu *obj, struct iovm_struct *area) |
69d3a84a HD |
329 | { |
330 | size_t bytes; | |
331 | ||
332 | BUG_ON(!obj || !area); | |
333 | ||
334 | bytes = area->da_end - area->da_start; | |
335 | ||
336 | dev_dbg(obj->dev, "%s: %08x-%08x(%x) %08x\n", | |
337 | __func__, area->da_start, area->da_end, bytes, area->flags); | |
338 | ||
339 | list_del(&area->list); | |
340 | kmem_cache_free(iovm_area_cachep, area); | |
341 | } | |
342 | ||
343 | /** | |
6c32df43 | 344 | * omap_da_to_va - convert (d) to (v) |
69d3a84a HD |
345 | * @obj: objective iommu |
346 | * @da: iommu device virtual address | |
347 | * @va: mpu virtual address | |
348 | * | |
349 | * Returns mpu virtual addr which corresponds to a given device virtual addr | |
350 | */ | |
6c32df43 | 351 | void *omap_da_to_va(struct omap_iommu *obj, u32 da) |
69d3a84a HD |
352 | { |
353 | void *va = NULL; | |
354 | struct iovm_struct *area; | |
355 | ||
356 | mutex_lock(&obj->mmap_lock); | |
357 | ||
358 | area = __find_iovm_area(obj, da); | |
359 | if (!area) { | |
360 | dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da); | |
361 | goto out; | |
362 | } | |
363 | va = area->va; | |
69d3a84a | 364 | out: |
26548900 DW |
365 | mutex_unlock(&obj->mmap_lock); |
366 | ||
69d3a84a HD |
367 | return va; |
368 | } | |
6c32df43 | 369 | EXPORT_SYMBOL_GPL(omap_da_to_va); |
69d3a84a HD |
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 | /* | |
6c32df43 | 383 | * iommu 'superpage' isn't supported with 'omap_iommu_vmalloc()' |
69d3a84a HD |
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; | |
69d3a84a HD |
393 | } |
394 | ||
395 | static inline void sgtable_drain_vmalloc(struct sg_table *sgt) | |
396 | { | |
397 | /* | |
398 | * Actually this is not necessary at all, just exists for | |
ba6a1179 | 399 | * consistency of the code readability. |
69d3a84a HD |
400 | */ |
401 | BUG_ON(!sgt); | |
402 | } | |
403 | ||
69d3a84a | 404 | /* create 'da' <-> 'pa' mapping from 'sgt' */ |
f626b52d OBC |
405 | static int map_iovm_area(struct iommu_domain *domain, struct iovm_struct *new, |
406 | const struct sg_table *sgt, u32 flags) | |
69d3a84a HD |
407 | { |
408 | int err; | |
409 | unsigned int i, j; | |
410 | struct scatterlist *sg; | |
411 | u32 da = new->da_start; | |
f626b52d | 412 | int order; |
69d3a84a | 413 | |
f626b52d | 414 | if (!domain || !sgt) |
69d3a84a HD |
415 | return -EINVAL; |
416 | ||
417 | BUG_ON(!sgtable_ok(sgt)); | |
418 | ||
419 | for_each_sg(sgt->sgl, sg, sgt->nents, i) { | |
420 | u32 pa; | |
69d3a84a | 421 | size_t bytes; |
69d3a84a | 422 | |
329d8d3b LP |
423 | pa = sg_phys(sg) - sg->offset; |
424 | bytes = sg->length + sg->offset; | |
69d3a84a HD |
425 | |
426 | flags &= ~IOVMF_PGSZ_MASK; | |
f626b52d OBC |
427 | |
428 | if (bytes_to_iopgsz(bytes) < 0) | |
69d3a84a | 429 | goto err_out; |
f626b52d OBC |
430 | |
431 | order = get_order(bytes); | |
69d3a84a HD |
432 | |
433 | pr_debug("%s: [%d] %08x %08x(%x)\n", __func__, | |
434 | i, da, pa, bytes); | |
435 | ||
f626b52d | 436 | err = iommu_map(domain, da, pa, order, flags); |
69d3a84a HD |
437 | if (err) |
438 | goto err_out; | |
439 | ||
440 | da += bytes; | |
441 | } | |
442 | return 0; | |
443 | ||
444 | err_out: | |
445 | da = new->da_start; | |
446 | ||
447 | for_each_sg(sgt->sgl, sg, i, j) { | |
448 | size_t bytes; | |
449 | ||
329d8d3b | 450 | bytes = sg->length + sg->offset; |
f626b52d | 451 | order = get_order(bytes); |
69d3a84a | 452 | |
f626b52d OBC |
453 | /* ignore failures.. we're already handling one */ |
454 | iommu_unmap(domain, da, order); | |
69d3a84a HD |
455 | |
456 | da += bytes; | |
457 | } | |
458 | return err; | |
459 | } | |
460 | ||
461 | /* release 'da' <-> 'pa' mapping */ | |
6c32df43 | 462 | static void unmap_iovm_area(struct iommu_domain *domain, struct omap_iommu *obj, |
f626b52d | 463 | struct iovm_struct *area) |
69d3a84a HD |
464 | { |
465 | u32 start; | |
466 | size_t total = area->da_end - area->da_start; | |
f626b52d OBC |
467 | const struct sg_table *sgt = area->sgt; |
468 | struct scatterlist *sg; | |
469 | int i, err; | |
69d3a84a | 470 | |
f626b52d | 471 | BUG_ON(!sgtable_ok(sgt)); |
69d3a84a HD |
472 | BUG_ON((!total) || !IS_ALIGNED(total, PAGE_SIZE)); |
473 | ||
474 | start = area->da_start; | |
f626b52d | 475 | for_each_sg(sgt->sgl, sg, sgt->nents, i) { |
69d3a84a | 476 | size_t bytes; |
f626b52d OBC |
477 | int order; |
478 | ||
329d8d3b | 479 | bytes = sg->length + sg->offset; |
f626b52d OBC |
480 | order = get_order(bytes); |
481 | ||
482 | err = iommu_unmap(domain, start, order); | |
5e1b612c | 483 | if (err < 0) |
f626b52d | 484 | break; |
69d3a84a | 485 | |
f626b52d | 486 | dev_dbg(obj->dev, "%s: unmap %08x(%x) %08x\n", |
69d3a84a HD |
487 | __func__, start, bytes, area->flags); |
488 | ||
489 | BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE)); | |
490 | ||
491 | total -= bytes; | |
492 | start += bytes; | |
493 | } | |
494 | BUG_ON(total); | |
495 | } | |
496 | ||
497 | /* template function for all unmapping */ | |
f626b52d | 498 | static struct sg_table *unmap_vm_area(struct iommu_domain *domain, |
6c32df43 | 499 | struct omap_iommu *obj, const u32 da, |
69d3a84a HD |
500 | void (*fn)(const void *), u32 flags) |
501 | { | |
502 | struct sg_table *sgt = NULL; | |
503 | struct iovm_struct *area; | |
504 | ||
505 | if (!IS_ALIGNED(da, PAGE_SIZE)) { | |
506 | dev_err(obj->dev, "%s: alignment err(%08x)\n", __func__, da); | |
507 | return NULL; | |
508 | } | |
509 | ||
510 | mutex_lock(&obj->mmap_lock); | |
511 | ||
512 | area = __find_iovm_area(obj, da); | |
513 | if (!area) { | |
514 | dev_dbg(obj->dev, "%s: no da area(%08x)\n", __func__, da); | |
515 | goto out; | |
516 | } | |
517 | ||
518 | if ((area->flags & flags) != flags) { | |
519 | dev_err(obj->dev, "%s: wrong flags(%08x)\n", __func__, | |
520 | area->flags); | |
521 | goto out; | |
522 | } | |
523 | sgt = (struct sg_table *)area->sgt; | |
524 | ||
f626b52d | 525 | unmap_iovm_area(domain, obj, area); |
69d3a84a HD |
526 | |
527 | fn(area->va); | |
528 | ||
529 | dev_dbg(obj->dev, "%s: %08x-%08x-%08x(%x) %08x\n", __func__, | |
530 | area->da_start, da, area->da_end, | |
531 | area->da_end - area->da_start, area->flags); | |
532 | ||
533 | free_iovm_area(obj, area); | |
534 | out: | |
535 | mutex_unlock(&obj->mmap_lock); | |
536 | ||
537 | return sgt; | |
538 | } | |
539 | ||
6c32df43 | 540 | static u32 map_iommu_region(struct iommu_domain *domain, struct omap_iommu *obj, |
f626b52d OBC |
541 | u32 da, const struct sg_table *sgt, void *va, |
542 | size_t bytes, u32 flags) | |
69d3a84a HD |
543 | { |
544 | int err = -ENOMEM; | |
545 | struct iovm_struct *new; | |
546 | ||
547 | mutex_lock(&obj->mmap_lock); | |
548 | ||
549 | new = alloc_iovm_area(obj, da, bytes, flags); | |
550 | if (IS_ERR(new)) { | |
551 | err = PTR_ERR(new); | |
552 | goto err_alloc_iovma; | |
553 | } | |
554 | new->va = va; | |
555 | new->sgt = sgt; | |
556 | ||
f626b52d | 557 | if (map_iovm_area(domain, new, sgt, new->flags)) |
69d3a84a HD |
558 | goto err_map; |
559 | ||
560 | mutex_unlock(&obj->mmap_lock); | |
561 | ||
562 | dev_dbg(obj->dev, "%s: da:%08x(%x) flags:%08x va:%p\n", | |
563 | __func__, new->da_start, bytes, new->flags, va); | |
564 | ||
565 | return new->da_start; | |
566 | ||
567 | err_map: | |
568 | free_iovm_area(obj, new); | |
569 | err_alloc_iovma: | |
570 | mutex_unlock(&obj->mmap_lock); | |
571 | return err; | |
572 | } | |
573 | ||
6c32df43 OBC |
574 | static inline u32 |
575 | __iommu_vmap(struct iommu_domain *domain, struct omap_iommu *obj, | |
f626b52d OBC |
576 | u32 da, const struct sg_table *sgt, |
577 | void *va, size_t bytes, u32 flags) | |
69d3a84a | 578 | { |
f626b52d | 579 | return map_iommu_region(domain, obj, da, sgt, va, bytes, flags); |
69d3a84a HD |
580 | } |
581 | ||
582 | /** | |
6c32df43 | 583 | * omap_iommu_vmap - (d)-(p)-(v) address mapper |
69d3a84a HD |
584 | * @obj: objective iommu |
585 | * @sgt: address of scatter gather table | |
586 | * @flags: iovma and page property | |
587 | * | |
588 | * Creates 1-n-1 mapping with given @sgt and returns @da. | |
589 | * All @sgt element must be io page size aligned. | |
590 | */ | |
6c32df43 | 591 | u32 omap_iommu_vmap(struct iommu_domain *domain, struct omap_iommu *obj, u32 da, |
f626b52d | 592 | const struct sg_table *sgt, u32 flags) |
69d3a84a HD |
593 | { |
594 | size_t bytes; | |
935e4739 | 595 | void *va = NULL; |
69d3a84a HD |
596 | |
597 | if (!obj || !obj->dev || !sgt) | |
598 | return -EINVAL; | |
599 | ||
600 | bytes = sgtable_len(sgt); | |
601 | if (!bytes) | |
602 | return -EINVAL; | |
603 | bytes = PAGE_ALIGN(bytes); | |
604 | ||
935e4739 HD |
605 | if (flags & IOVMF_MMIO) { |
606 | va = vmap_sg(sgt); | |
607 | if (IS_ERR(va)) | |
608 | return PTR_ERR(va); | |
609 | } | |
69d3a84a | 610 | |
69d3a84a HD |
611 | flags |= IOVMF_DISCONT; |
612 | flags |= IOVMF_MMIO; | |
69d3a84a | 613 | |
f626b52d | 614 | da = __iommu_vmap(domain, obj, da, sgt, va, bytes, flags); |
69d3a84a HD |
615 | if (IS_ERR_VALUE(da)) |
616 | vunmap_sg(va); | |
617 | ||
329d8d3b | 618 | return da + sgtable_offset(sgt); |
69d3a84a | 619 | } |
6c32df43 | 620 | EXPORT_SYMBOL_GPL(omap_iommu_vmap); |
69d3a84a HD |
621 | |
622 | /** | |
6c32df43 | 623 | * omap_iommu_vunmap - release virtual mapping obtained by 'omap_iommu_vmap()' |
69d3a84a HD |
624 | * @obj: objective iommu |
625 | * @da: iommu device virtual address | |
626 | * | |
627 | * Free the iommu virtually contiguous memory area starting at | |
6c32df43 | 628 | * @da, which was returned by 'omap_iommu_vmap()'. |
69d3a84a | 629 | */ |
f626b52d | 630 | struct sg_table * |
6c32df43 | 631 | omap_iommu_vunmap(struct iommu_domain *domain, struct omap_iommu *obj, u32 da) |
69d3a84a HD |
632 | { |
633 | struct sg_table *sgt; | |
634 | /* | |
6c32df43 | 635 | * 'sgt' is allocated before 'omap_iommu_vmalloc()' is called. |
69d3a84a HD |
636 | * Just returns 'sgt' to the caller to free |
637 | */ | |
329d8d3b | 638 | da &= PAGE_MASK; |
f626b52d OBC |
639 | sgt = unmap_vm_area(domain, obj, da, vunmap_sg, |
640 | IOVMF_DISCONT | IOVMF_MMIO); | |
69d3a84a HD |
641 | if (!sgt) |
642 | dev_dbg(obj->dev, "%s: No sgt\n", __func__); | |
643 | return sgt; | |
644 | } | |
6c32df43 | 645 | EXPORT_SYMBOL_GPL(omap_iommu_vunmap); |
69d3a84a HD |
646 | |
647 | /** | |
6c32df43 | 648 | * omap_iommu_vmalloc - (d)-(p)-(v) address allocator and mapper |
69d3a84a HD |
649 | * @obj: objective iommu |
650 | * @da: contiguous iommu virtual memory | |
651 | * @bytes: allocation size | |
652 | * @flags: iovma and page property | |
653 | * | |
654 | * Allocate @bytes linearly and creates 1-n-1 mapping and returns | |
d038aee2 | 655 | * @da again, which might be adjusted if 'IOVMF_DA_FIXED' is not set. |
69d3a84a | 656 | */ |
6c32df43 OBC |
657 | u32 |
658 | omap_iommu_vmalloc(struct iommu_domain *domain, struct omap_iommu *obj, u32 da, | |
f626b52d | 659 | size_t bytes, u32 flags) |
69d3a84a HD |
660 | { |
661 | void *va; | |
662 | struct sg_table *sgt; | |
663 | ||
664 | if (!obj || !obj->dev || !bytes) | |
665 | return -EINVAL; | |
666 | ||
667 | bytes = PAGE_ALIGN(bytes); | |
668 | ||
669 | va = vmalloc(bytes); | |
670 | if (!va) | |
671 | return -ENOMEM; | |
672 | ||
ad108121 GLF |
673 | flags |= IOVMF_DISCONT; |
674 | flags |= IOVMF_ALLOC; | |
ad108121 GLF |
675 | |
676 | sgt = sgtable_alloc(bytes, flags, da, 0); | |
69d3a84a HD |
677 | if (IS_ERR(sgt)) { |
678 | da = PTR_ERR(sgt); | |
679 | goto err_sgt_alloc; | |
680 | } | |
681 | sgtable_fill_vmalloc(sgt, va); | |
682 | ||
f626b52d | 683 | da = __iommu_vmap(domain, obj, da, sgt, va, bytes, flags); |
69d3a84a HD |
684 | if (IS_ERR_VALUE(da)) |
685 | goto err_iommu_vmap; | |
686 | ||
687 | return da; | |
688 | ||
689 | err_iommu_vmap: | |
690 | sgtable_drain_vmalloc(sgt); | |
691 | sgtable_free(sgt); | |
692 | err_sgt_alloc: | |
693 | vfree(va); | |
694 | return da; | |
695 | } | |
6c32df43 | 696 | EXPORT_SYMBOL_GPL(omap_iommu_vmalloc); |
69d3a84a HD |
697 | |
698 | /** | |
6c32df43 | 699 | * omap_iommu_vfree - release memory allocated by 'omap_iommu_vmalloc()' |
69d3a84a HD |
700 | * @obj: objective iommu |
701 | * @da: iommu device virtual address | |
702 | * | |
703 | * Frees the iommu virtually continuous memory area starting at | |
6c32df43 | 704 | * @da, as obtained from 'omap_iommu_vmalloc()'. |
69d3a84a | 705 | */ |
6c32df43 OBC |
706 | void omap_iommu_vfree(struct iommu_domain *domain, struct omap_iommu *obj, |
707 | const u32 da) | |
69d3a84a HD |
708 | { |
709 | struct sg_table *sgt; | |
710 | ||
f626b52d OBC |
711 | sgt = unmap_vm_area(domain, obj, da, vfree, |
712 | IOVMF_DISCONT | IOVMF_ALLOC); | |
69d3a84a HD |
713 | if (!sgt) |
714 | dev_dbg(obj->dev, "%s: No sgt\n", __func__); | |
715 | sgtable_free(sgt); | |
716 | } | |
6c32df43 | 717 | EXPORT_SYMBOL_GPL(omap_iommu_vfree); |
69d3a84a | 718 | |
69d3a84a HD |
719 | static int __init iovmm_init(void) |
720 | { | |
721 | const unsigned long flags = SLAB_HWCACHE_ALIGN; | |
722 | struct kmem_cache *p; | |
723 | ||
724 | p = kmem_cache_create("iovm_area_cache", sizeof(struct iovm_struct), 0, | |
725 | flags, NULL); | |
726 | if (!p) | |
727 | return -ENOMEM; | |
728 | iovm_area_cachep = p; | |
729 | ||
730 | return 0; | |
731 | } | |
732 | module_init(iovmm_init); | |
733 | ||
734 | static void __exit iovmm_exit(void) | |
735 | { | |
736 | kmem_cache_destroy(iovm_area_cachep); | |
737 | } | |
738 | module_exit(iovmm_exit); | |
739 | ||
740 | MODULE_DESCRIPTION("omap iommu: simple virtual address space management"); | |
741 | MODULE_AUTHOR("Hiroshi DOYU <Hiroshi.DOYU@nokia.com>"); | |
742 | MODULE_LICENSE("GPL v2"); |