1 /*
2 * Copyright 2010 Red Hat Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included in
12 * all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Authors: Ben Skeggs
23 */
24 #include "priv.h"
25
26 #include <core/gpuobj.h>
27 #include <subdev/fb.h>
28
29 void
nvkm_vm_map_at(struct nvkm_vma * vma,u64 delta,struct nvkm_mem * node)30 nvkm_vm_map_at(struct nvkm_vma *vma, u64 delta, struct nvkm_mem *node)
31 {
32 struct nvkm_vm *vm = vma->vm;
33 struct nvkm_mmu *mmu = vm->mmu;
34 struct nvkm_mm_node *r;
35 int big = vma->node->type != mmu->func->spg_shift;
36 u32 offset = vma->node->offset + (delta >> 12);
37 u32 bits = vma->node->type - 12;
38 u32 pde = (offset >> mmu->func->pgt_bits) - vm->fpde;
39 u32 pte = (offset & ((1 << mmu->func->pgt_bits) - 1)) >> bits;
40 u32 max = 1 << (mmu->func->pgt_bits - bits);
41 u32 end, len;
42
43 delta = 0;
44 list_for_each_entry(r, &node->regions, rl_entry) {
45 u64 phys = (u64)r->offset << 12;
46 u32 num = r->length >> bits;
47
48 while (num) {
49 struct nvkm_memory *pgt = vm->pgt[pde].mem[big];
50
51 end = (pte + num);
52 if (unlikely(end >= max))
53 end = max;
54 len = end - pte;
55
56 mmu->func->map(vma, pgt, node, pte, len, phys, delta);
57
58 num -= len;
59 pte += len;
60 if (unlikely(end >= max)) {
61 phys += len << (bits + 12);
62 pde++;
63 pte = 0;
64 }
65
66 delta += (u64)len << vma->node->type;
67 }
68 }
69
70 mmu->func->flush(vm);
71 }
72
73 static void
nvkm_vm_map_sg_table(struct nvkm_vma * vma,u64 delta,u64 length,struct nvkm_mem * mem)74 nvkm_vm_map_sg_table(struct nvkm_vma *vma, u64 delta, u64 length,
75 struct nvkm_mem *mem)
76 {
77 struct nvkm_vm *vm = vma->vm;
78 struct nvkm_mmu *mmu = vm->mmu;
79 int big = vma->node->type != mmu->func->spg_shift;
80 u32 offset = vma->node->offset + (delta >> 12);
81 u32 bits = vma->node->type - 12;
82 u32 num = length >> vma->node->type;
83 u32 pde = (offset >> mmu->func->pgt_bits) - vm->fpde;
84 u32 pte = (offset & ((1 << mmu->func->pgt_bits) - 1)) >> bits;
85 u32 max = 1 << (mmu->func->pgt_bits - bits);
86 unsigned m, sglen;
87 u32 end, len;
88 int i;
89 struct scatterlist *sg;
90
91 for_each_sg(mem->sg->sgl, sg, mem->sg->nents, i) {
92 struct nvkm_memory *pgt = vm->pgt[pde].mem[big];
93 sglen = sg_dma_len(sg) >> PAGE_SHIFT;
94
95 end = pte + sglen;
96 if (unlikely(end >= max))
97 end = max;
98 len = end - pte;
99
100 for (m = 0; m < len; m++) {
101 dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
102
103 mmu->func->map_sg(vma, pgt, mem, pte, 1, &addr);
104 num--;
105 pte++;
106
107 if (num == 0)
108 goto finish;
109 }
110 if (unlikely(end >= max)) {
111 pde++;
112 pte = 0;
113 }
114 if (m < sglen) {
115 for (; m < sglen; m++) {
116 dma_addr_t addr = sg_dma_address(sg) + (m << PAGE_SHIFT);
117
118 mmu->func->map_sg(vma, pgt, mem, pte, 1, &addr);
119 num--;
120 pte++;
121 if (num == 0)
122 goto finish;
123 }
124 }
125
126 }
127 finish:
128 mmu->func->flush(vm);
129 }
130
131 static void
nvkm_vm_map_sg(struct nvkm_vma * vma,u64 delta,u64 length,struct nvkm_mem * mem)132 nvkm_vm_map_sg(struct nvkm_vma *vma, u64 delta, u64 length,
133 struct nvkm_mem *mem)
134 {
135 struct nvkm_vm *vm = vma->vm;
136 struct nvkm_mmu *mmu = vm->mmu;
137 dma_addr_t *list = mem->pages;
138 int big = vma->node->type != mmu->func->spg_shift;
139 u32 offset = vma->node->offset + (delta >> 12);
140 u32 bits = vma->node->type - 12;
141 u32 num = length >> vma->node->type;
142 u32 pde = (offset >> mmu->func->pgt_bits) - vm->fpde;
143 u32 pte = (offset & ((1 << mmu->func->pgt_bits) - 1)) >> bits;
144 u32 max = 1 << (mmu->func->pgt_bits - bits);
145 u32 end, len;
146
147 while (num) {
148 struct nvkm_memory *pgt = vm->pgt[pde].mem[big];
149
150 end = (pte + num);
151 if (unlikely(end >= max))
152 end = max;
153 len = end - pte;
154
155 mmu->func->map_sg(vma, pgt, mem, pte, len, list);
156
157 num -= len;
158 pte += len;
159 list += len;
160 if (unlikely(end >= max)) {
161 pde++;
162 pte = 0;
163 }
164 }
165
166 mmu->func->flush(vm);
167 }
168
169 void
nvkm_vm_map(struct nvkm_vma * vma,struct nvkm_mem * node)170 nvkm_vm_map(struct nvkm_vma *vma, struct nvkm_mem *node)
171 {
172 if (node->sg)
173 nvkm_vm_map_sg_table(vma, 0, node->size << 12, node);
174 else
175 if (node->pages)
176 nvkm_vm_map_sg(vma, 0, node->size << 12, node);
177 else
178 nvkm_vm_map_at(vma, 0, node);
179 }
180
181 void
nvkm_vm_unmap_at(struct nvkm_vma * vma,u64 delta,u64 length)182 nvkm_vm_unmap_at(struct nvkm_vma *vma, u64 delta, u64 length)
183 {
184 struct nvkm_vm *vm = vma->vm;
185 struct nvkm_mmu *mmu = vm->mmu;
186 int big = vma->node->type != mmu->func->spg_shift;
187 u32 offset = vma->node->offset + (delta >> 12);
188 u32 bits = vma->node->type - 12;
189 u32 num = length >> vma->node->type;
190 u32 pde = (offset >> mmu->func->pgt_bits) - vm->fpde;
191 u32 pte = (offset & ((1 << mmu->func->pgt_bits) - 1)) >> bits;
192 u32 max = 1 << (mmu->func->pgt_bits - bits);
193 u32 end, len;
194
195 while (num) {
196 struct nvkm_memory *pgt = vm->pgt[pde].mem[big];
197
198 end = (pte + num);
199 if (unlikely(end >= max))
200 end = max;
201 len = end - pte;
202
203 mmu->func->unmap(vma, pgt, pte, len);
204
205 num -= len;
206 pte += len;
207 if (unlikely(end >= max)) {
208 pde++;
209 pte = 0;
210 }
211 }
212
213 mmu->func->flush(vm);
214 }
215
216 void
nvkm_vm_unmap(struct nvkm_vma * vma)217 nvkm_vm_unmap(struct nvkm_vma *vma)
218 {
219 nvkm_vm_unmap_at(vma, 0, (u64)vma->node->length << 12);
220 }
221
222 static void
nvkm_vm_unmap_pgt(struct nvkm_vm * vm,int big,u32 fpde,u32 lpde)223 nvkm_vm_unmap_pgt(struct nvkm_vm *vm, int big, u32 fpde, u32 lpde)
224 {
225 struct nvkm_mmu *mmu = vm->mmu;
226 struct nvkm_vm_pgd *vpgd;
227 struct nvkm_vm_pgt *vpgt;
228 struct nvkm_memory *pgt;
229 u32 pde;
230
231 for (pde = fpde; pde <= lpde; pde++) {
232 vpgt = &vm->pgt[pde - vm->fpde];
233 if (--vpgt->refcount[big])
234 continue;
235
236 pgt = vpgt->mem[big];
237 vpgt->mem[big] = NULL;
238
239 list_for_each_entry(vpgd, &vm->pgd_list, head) {
240 mmu->func->map_pgt(vpgd->obj, pde, vpgt->mem);
241 }
242
243 nvkm_memory_del(&pgt);
244 }
245 }
246
247 static int
nvkm_vm_map_pgt(struct nvkm_vm * vm,u32 pde,u32 type)248 nvkm_vm_map_pgt(struct nvkm_vm *vm, u32 pde, u32 type)
249 {
250 struct nvkm_mmu *mmu = vm->mmu;
251 struct nvkm_vm_pgt *vpgt = &vm->pgt[pde - vm->fpde];
252 struct nvkm_vm_pgd *vpgd;
253 int big = (type != mmu->func->spg_shift);
254 u32 pgt_size;
255 int ret;
256
257 pgt_size = (1 << (mmu->func->pgt_bits + 12)) >> type;
258 pgt_size *= 8;
259
260 ret = nvkm_memory_new(mmu->subdev.device, NVKM_MEM_TARGET_INST,
261 pgt_size, 0x1000, true, &vpgt->mem[big]);
262 if (unlikely(ret))
263 return ret;
264
265 list_for_each_entry(vpgd, &vm->pgd_list, head) {
266 mmu->func->map_pgt(vpgd->obj, pde, vpgt->mem);
267 }
268
269 vpgt->refcount[big]++;
270 return 0;
271 }
272
273 int
nvkm_vm_get(struct nvkm_vm * vm,u64 size,u32 page_shift,u32 access,struct nvkm_vma * vma)274 nvkm_vm_get(struct nvkm_vm *vm, u64 size, u32 page_shift, u32 access,
275 struct nvkm_vma *vma)
276 {
277 struct nvkm_mmu *mmu = vm->mmu;
278 u32 align = (1 << page_shift) >> 12;
279 u32 msize = size >> 12;
280 u32 fpde, lpde, pde;
281 int ret;
282
283 mutex_lock(&vm->mutex);
284 ret = nvkm_mm_head(&vm->mm, 0, page_shift, msize, msize, align,
285 &vma->node);
286 if (unlikely(ret != 0)) {
287 mutex_unlock(&vm->mutex);
288 return ret;
289 }
290
291 fpde = (vma->node->offset >> mmu->func->pgt_bits);
292 lpde = (vma->node->offset + vma->node->length - 1) >> mmu->func->pgt_bits;
293
294 for (pde = fpde; pde <= lpde; pde++) {
295 struct nvkm_vm_pgt *vpgt = &vm->pgt[pde - vm->fpde];
296 int big = (vma->node->type != mmu->func->spg_shift);
297
298 if (likely(vpgt->refcount[big])) {
299 vpgt->refcount[big]++;
300 continue;
301 }
302
303 ret = nvkm_vm_map_pgt(vm, pde, vma->node->type);
304 if (ret) {
305 if (pde != fpde)
306 nvkm_vm_unmap_pgt(vm, big, fpde, pde - 1);
307 nvkm_mm_free(&vm->mm, &vma->node);
308 mutex_unlock(&vm->mutex);
309 return ret;
310 }
311 }
312 mutex_unlock(&vm->mutex);
313
314 vma->vm = NULL;
315 nvkm_vm_ref(vm, &vma->vm, NULL);
316 vma->offset = (u64)vma->node->offset << 12;
317 vma->access = access;
318 return 0;
319 }
320
321 void
nvkm_vm_put(struct nvkm_vma * vma)322 nvkm_vm_put(struct nvkm_vma *vma)
323 {
324 struct nvkm_mmu *mmu;
325 struct nvkm_vm *vm;
326 u32 fpde, lpde;
327
328 if (unlikely(vma->node == NULL))
329 return;
330 vm = vma->vm;
331 mmu = vm->mmu;
332
333 fpde = (vma->node->offset >> mmu->func->pgt_bits);
334 lpde = (vma->node->offset + vma->node->length - 1) >> mmu->func->pgt_bits;
335
336 mutex_lock(&vm->mutex);
337 nvkm_vm_unmap_pgt(vm, vma->node->type != mmu->func->spg_shift, fpde, lpde);
338 nvkm_mm_free(&vm->mm, &vma->node);
339 mutex_unlock(&vm->mutex);
340
341 nvkm_vm_ref(NULL, &vma->vm, NULL);
342 }
343
344 int
nvkm_vm_boot(struct nvkm_vm * vm,u64 size)345 nvkm_vm_boot(struct nvkm_vm *vm, u64 size)
346 {
347 struct nvkm_mmu *mmu = vm->mmu;
348 struct nvkm_memory *pgt;
349 int ret;
350
351 ret = nvkm_memory_new(mmu->subdev.device, NVKM_MEM_TARGET_INST,
352 (size >> mmu->func->spg_shift) * 8, 0x1000, true, &pgt);
353 if (ret == 0) {
354 vm->pgt[0].refcount[0] = 1;
355 vm->pgt[0].mem[0] = pgt;
356 nvkm_memory_boot(pgt, vm);
357 }
358
359 return ret;
360 }
361
362 int
nvkm_vm_create(struct nvkm_mmu * mmu,u64 offset,u64 length,u64 mm_offset,u32 block,struct lock_class_key * key,struct nvkm_vm ** pvm)363 nvkm_vm_create(struct nvkm_mmu *mmu, u64 offset, u64 length, u64 mm_offset,
364 u32 block, struct lock_class_key *key, struct nvkm_vm **pvm)
365 {
366 static struct lock_class_key _key;
367 struct nvkm_vm *vm;
368 u64 mm_length = (offset + length) - mm_offset;
369 int ret;
370
371 vm = kzalloc(sizeof(*vm), GFP_KERNEL);
372 if (!vm)
373 return -ENOMEM;
374
375 __mutex_init(&vm->mutex, "&vm->mutex", key ? key : &_key);
376 INIT_LIST_HEAD(&vm->pgd_list);
377 vm->mmu = mmu;
378 kref_init(&vm->refcount);
379 vm->fpde = offset >> (mmu->func->pgt_bits + 12);
380 vm->lpde = (offset + length - 1) >> (mmu->func->pgt_bits + 12);
381
382 vm->pgt = vzalloc((vm->lpde - vm->fpde + 1) * sizeof(*vm->pgt));
383 if (!vm->pgt) {
384 kfree(vm);
385 return -ENOMEM;
386 }
387
388 ret = nvkm_mm_init(&vm->mm, mm_offset >> 12, mm_length >> 12,
389 block >> 12);
390 if (ret) {
391 vfree(vm->pgt);
392 kfree(vm);
393 return ret;
394 }
395
396 *pvm = vm;
397
398 return 0;
399 }
400
401 int
nvkm_vm_new(struct nvkm_device * device,u64 offset,u64 length,u64 mm_offset,struct lock_class_key * key,struct nvkm_vm ** pvm)402 nvkm_vm_new(struct nvkm_device *device, u64 offset, u64 length, u64 mm_offset,
403 struct lock_class_key *key, struct nvkm_vm **pvm)
404 {
405 struct nvkm_mmu *mmu = device->mmu;
406 if (!mmu->func->create)
407 return -EINVAL;
408 return mmu->func->create(mmu, offset, length, mm_offset, key, pvm);
409 }
410
411 static int
nvkm_vm_link(struct nvkm_vm * vm,struct nvkm_gpuobj * pgd)412 nvkm_vm_link(struct nvkm_vm *vm, struct nvkm_gpuobj *pgd)
413 {
414 struct nvkm_mmu *mmu = vm->mmu;
415 struct nvkm_vm_pgd *vpgd;
416 int i;
417
418 if (!pgd)
419 return 0;
420
421 vpgd = kzalloc(sizeof(*vpgd), GFP_KERNEL);
422 if (!vpgd)
423 return -ENOMEM;
424
425 vpgd->obj = pgd;
426
427 mutex_lock(&vm->mutex);
428 for (i = vm->fpde; i <= vm->lpde; i++)
429 mmu->func->map_pgt(pgd, i, vm->pgt[i - vm->fpde].mem);
430 list_add(&vpgd->head, &vm->pgd_list);
431 mutex_unlock(&vm->mutex);
432 return 0;
433 }
434
435 static void
nvkm_vm_unlink(struct nvkm_vm * vm,struct nvkm_gpuobj * mpgd)436 nvkm_vm_unlink(struct nvkm_vm *vm, struct nvkm_gpuobj *mpgd)
437 {
438 struct nvkm_vm_pgd *vpgd, *tmp;
439
440 if (!mpgd)
441 return;
442
443 mutex_lock(&vm->mutex);
444 list_for_each_entry_safe(vpgd, tmp, &vm->pgd_list, head) {
445 if (vpgd->obj == mpgd) {
446 list_del(&vpgd->head);
447 kfree(vpgd);
448 break;
449 }
450 }
451 mutex_unlock(&vm->mutex);
452 }
453
454 static void
nvkm_vm_del(struct kref * kref)455 nvkm_vm_del(struct kref *kref)
456 {
457 struct nvkm_vm *vm = container_of(kref, typeof(*vm), refcount);
458 struct nvkm_vm_pgd *vpgd, *tmp;
459
460 list_for_each_entry_safe(vpgd, tmp, &vm->pgd_list, head) {
461 nvkm_vm_unlink(vm, vpgd->obj);
462 }
463
464 nvkm_mm_fini(&vm->mm);
465 vfree(vm->pgt);
466 kfree(vm);
467 }
468
469 int
nvkm_vm_ref(struct nvkm_vm * ref,struct nvkm_vm ** ptr,struct nvkm_gpuobj * pgd)470 nvkm_vm_ref(struct nvkm_vm *ref, struct nvkm_vm **ptr, struct nvkm_gpuobj *pgd)
471 {
472 if (ref) {
473 int ret = nvkm_vm_link(ref, pgd);
474 if (ret)
475 return ret;
476
477 kref_get(&ref->refcount);
478 }
479
480 if (*ptr) {
481 nvkm_vm_unlink(*ptr, pgd);
482 kref_put(&(*ptr)->refcount, nvkm_vm_del);
483 }
484
485 *ptr = ref;
486 return 0;
487 }
488
489 static int
nvkm_mmu_oneinit(struct nvkm_subdev * subdev)490 nvkm_mmu_oneinit(struct nvkm_subdev *subdev)
491 {
492 struct nvkm_mmu *mmu = nvkm_mmu(subdev);
493 if (mmu->func->oneinit)
494 return mmu->func->oneinit(mmu);
495 return 0;
496 }
497
498 static int
nvkm_mmu_init(struct nvkm_subdev * subdev)499 nvkm_mmu_init(struct nvkm_subdev *subdev)
500 {
501 struct nvkm_mmu *mmu = nvkm_mmu(subdev);
502 if (mmu->func->init)
503 mmu->func->init(mmu);
504 return 0;
505 }
506
507 static void *
nvkm_mmu_dtor(struct nvkm_subdev * subdev)508 nvkm_mmu_dtor(struct nvkm_subdev *subdev)
509 {
510 struct nvkm_mmu *mmu = nvkm_mmu(subdev);
511 if (mmu->func->dtor)
512 return mmu->func->dtor(mmu);
513 return mmu;
514 }
515
516 static const struct nvkm_subdev_func
517 nvkm_mmu = {
518 .dtor = nvkm_mmu_dtor,
519 .oneinit = nvkm_mmu_oneinit,
520 .init = nvkm_mmu_init,
521 };
522
523 void
nvkm_mmu_ctor(const struct nvkm_mmu_func * func,struct nvkm_device * device,int index,struct nvkm_mmu * mmu)524 nvkm_mmu_ctor(const struct nvkm_mmu_func *func, struct nvkm_device *device,
525 int index, struct nvkm_mmu *mmu)
526 {
527 nvkm_subdev_ctor(&nvkm_mmu, device, index, 0, &mmu->subdev);
528 mmu->func = func;
529 mmu->limit = func->limit;
530 mmu->dma_bits = func->dma_bits;
531 mmu->lpg_shift = func->lpg_shift;
532 }
533
534 int
nvkm_mmu_new_(const struct nvkm_mmu_func * func,struct nvkm_device * device,int index,struct nvkm_mmu ** pmmu)535 nvkm_mmu_new_(const struct nvkm_mmu_func *func, struct nvkm_device *device,
536 int index, struct nvkm_mmu **pmmu)
537 {
538 if (!(*pmmu = kzalloc(sizeof(**pmmu), GFP_KERNEL)))
539 return -ENOMEM;
540 nvkm_mmu_ctor(func, device, index, *pmmu);
541 return 0;
542 }
543