269cfca9ca06834dad2fad7359c3df13f4d97c09
[releases.git] / bochs_mm.c
1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License as published by
4  * the Free Software Foundation; either version 2 of the License, or
5  * (at your option) any later version.
6  */
7
8 #include "bochs.h"
9
10 static void bochs_ttm_placement(struct bochs_bo *bo, int domain);
11
12 /* ---------------------------------------------------------------------- */
13
14 static inline struct bochs_device *bochs_bdev(struct ttm_bo_device *bd)
15 {
16         return container_of(bd, struct bochs_device, ttm.bdev);
17 }
18
19 static int bochs_ttm_mem_global_init(struct drm_global_reference *ref)
20 {
21         return ttm_mem_global_init(ref->object);
22 }
23
24 static void bochs_ttm_mem_global_release(struct drm_global_reference *ref)
25 {
26         ttm_mem_global_release(ref->object);
27 }
28
29 static int bochs_ttm_global_init(struct bochs_device *bochs)
30 {
31         struct drm_global_reference *global_ref;
32         int r;
33
34         global_ref = &bochs->ttm.mem_global_ref;
35         global_ref->global_type = DRM_GLOBAL_TTM_MEM;
36         global_ref->size = sizeof(struct ttm_mem_global);
37         global_ref->init = &bochs_ttm_mem_global_init;
38         global_ref->release = &bochs_ttm_mem_global_release;
39         r = drm_global_item_ref(global_ref);
40         if (r != 0) {
41                 DRM_ERROR("Failed setting up TTM memory accounting "
42                           "subsystem.\n");
43                 return r;
44         }
45
46         bochs->ttm.bo_global_ref.mem_glob =
47                 bochs->ttm.mem_global_ref.object;
48         global_ref = &bochs->ttm.bo_global_ref.ref;
49         global_ref->global_type = DRM_GLOBAL_TTM_BO;
50         global_ref->size = sizeof(struct ttm_bo_global);
51         global_ref->init = &ttm_bo_global_init;
52         global_ref->release = &ttm_bo_global_release;
53         r = drm_global_item_ref(global_ref);
54         if (r != 0) {
55                 DRM_ERROR("Failed setting up TTM BO subsystem.\n");
56                 drm_global_item_unref(&bochs->ttm.mem_global_ref);
57                 return r;
58         }
59
60         return 0;
61 }
62
63 static void bochs_ttm_global_release(struct bochs_device *bochs)
64 {
65         if (bochs->ttm.mem_global_ref.release == NULL)
66                 return;
67
68         drm_global_item_unref(&bochs->ttm.bo_global_ref.ref);
69         drm_global_item_unref(&bochs->ttm.mem_global_ref);
70         bochs->ttm.mem_global_ref.release = NULL;
71 }
72
73
74 static void bochs_bo_ttm_destroy(struct ttm_buffer_object *tbo)
75 {
76         struct bochs_bo *bo;
77
78         bo = container_of(tbo, struct bochs_bo, bo);
79         drm_gem_object_release(&bo->gem);
80         kfree(bo);
81 }
82
83 static bool bochs_ttm_bo_is_bochs_bo(struct ttm_buffer_object *bo)
84 {
85         if (bo->destroy == &bochs_bo_ttm_destroy)
86                 return true;
87         return false;
88 }
89
90 static int bochs_bo_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
91                                   struct ttm_mem_type_manager *man)
92 {
93         switch (type) {
94         case TTM_PL_SYSTEM:
95                 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
96                 man->available_caching = TTM_PL_MASK_CACHING;
97                 man->default_caching = TTM_PL_FLAG_CACHED;
98                 break;
99         case TTM_PL_VRAM:
100                 man->func = &ttm_bo_manager_func;
101                 man->flags = TTM_MEMTYPE_FLAG_FIXED |
102                         TTM_MEMTYPE_FLAG_MAPPABLE;
103                 man->available_caching = TTM_PL_FLAG_UNCACHED |
104                         TTM_PL_FLAG_WC;
105                 man->default_caching = TTM_PL_FLAG_WC;
106                 break;
107         default:
108                 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
109                 return -EINVAL;
110         }
111         return 0;
112 }
113
114 static void
115 bochs_bo_evict_flags(struct ttm_buffer_object *bo, struct ttm_placement *pl)
116 {
117         struct bochs_bo *bochsbo = bochs_bo(bo);
118
119         if (!bochs_ttm_bo_is_bochs_bo(bo))
120                 return;
121
122         bochs_ttm_placement(bochsbo, TTM_PL_FLAG_SYSTEM);
123         *pl = bochsbo->placement;
124 }
125
126 static int bochs_bo_verify_access(struct ttm_buffer_object *bo,
127                                   struct file *filp)
128 {
129         struct bochs_bo *bochsbo = bochs_bo(bo);
130
131         return drm_vma_node_verify_access(&bochsbo->gem.vma_node,
132                                           filp->private_data);
133 }
134
135 static int bochs_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
136                                     struct ttm_mem_reg *mem)
137 {
138         struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
139         struct bochs_device *bochs = bochs_bdev(bdev);
140
141         mem->bus.addr = NULL;
142         mem->bus.offset = 0;
143         mem->bus.size = mem->num_pages << PAGE_SHIFT;
144         mem->bus.base = 0;
145         mem->bus.is_iomem = false;
146         if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
147                 return -EINVAL;
148         switch (mem->mem_type) {
149         case TTM_PL_SYSTEM:
150                 /* system memory */
151                 return 0;
152         case TTM_PL_VRAM:
153                 mem->bus.offset = mem->start << PAGE_SHIFT;
154                 mem->bus.base = bochs->fb_base;
155                 mem->bus.is_iomem = true;
156                 break;
157         default:
158                 return -EINVAL;
159                 break;
160         }
161         return 0;
162 }
163
164 static void bochs_ttm_io_mem_free(struct ttm_bo_device *bdev,
165                                   struct ttm_mem_reg *mem)
166 {
167 }
168
169 static void bochs_ttm_backend_destroy(struct ttm_tt *tt)
170 {
171         ttm_tt_fini(tt);
172         kfree(tt);
173 }
174
175 static struct ttm_backend_func bochs_tt_backend_func = {
176         .destroy = &bochs_ttm_backend_destroy,
177 };
178
179 static struct ttm_tt *bochs_ttm_tt_create(struct ttm_bo_device *bdev,
180                                           unsigned long size,
181                                           uint32_t page_flags,
182                                           struct page *dummy_read_page)
183 {
184         struct ttm_tt *tt;
185
186         tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
187         if (tt == NULL)
188                 return NULL;
189         tt->func = &bochs_tt_backend_func;
190         if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
191                 kfree(tt);
192                 return NULL;
193         }
194         return tt;
195 }
196
197 struct ttm_bo_driver bochs_bo_driver = {
198         .ttm_tt_create = bochs_ttm_tt_create,
199         .ttm_tt_populate = ttm_pool_populate,
200         .ttm_tt_unpopulate = ttm_pool_unpopulate,
201         .init_mem_type = bochs_bo_init_mem_type,
202         .evict_flags = bochs_bo_evict_flags,
203         .move = NULL,
204         .verify_access = bochs_bo_verify_access,
205         .io_mem_reserve = &bochs_ttm_io_mem_reserve,
206         .io_mem_free = &bochs_ttm_io_mem_free,
207         .lru_tail = &ttm_bo_default_lru_tail,
208         .swap_lru_tail = &ttm_bo_default_swap_lru_tail,
209 };
210
211 int bochs_mm_init(struct bochs_device *bochs)
212 {
213         struct ttm_bo_device *bdev = &bochs->ttm.bdev;
214         int ret;
215
216         ret = bochs_ttm_global_init(bochs);
217         if (ret)
218                 return ret;
219
220         ret = ttm_bo_device_init(&bochs->ttm.bdev,
221                                  bochs->ttm.bo_global_ref.ref.object,
222                                  &bochs_bo_driver,
223                                  bochs->dev->anon_inode->i_mapping,
224                                  DRM_FILE_PAGE_OFFSET,
225                                  true);
226         if (ret) {
227                 DRM_ERROR("Error initialising bo driver; %d\n", ret);
228                 return ret;
229         }
230
231         ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
232                              bochs->fb_size >> PAGE_SHIFT);
233         if (ret) {
234                 DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
235                 return ret;
236         }
237
238         bochs->ttm.initialized = true;
239         return 0;
240 }
241
242 void bochs_mm_fini(struct bochs_device *bochs)
243 {
244         if (!bochs->ttm.initialized)
245                 return;
246
247         ttm_bo_device_release(&bochs->ttm.bdev);
248         bochs_ttm_global_release(bochs);
249         bochs->ttm.initialized = false;
250 }
251
252 static void bochs_ttm_placement(struct bochs_bo *bo, int domain)
253 {
254         unsigned i;
255         u32 c = 0;
256         bo->placement.placement = bo->placements;
257         bo->placement.busy_placement = bo->placements;
258         if (domain & TTM_PL_FLAG_VRAM) {
259                 bo->placements[c++].flags = TTM_PL_FLAG_WC
260                         | TTM_PL_FLAG_UNCACHED
261                         | TTM_PL_FLAG_VRAM;
262         }
263         if (domain & TTM_PL_FLAG_SYSTEM) {
264                 bo->placements[c++].flags = TTM_PL_MASK_CACHING
265                         | TTM_PL_FLAG_SYSTEM;
266         }
267         if (!c) {
268                 bo->placements[c++].flags = TTM_PL_MASK_CACHING
269                         | TTM_PL_FLAG_SYSTEM;
270         }
271         for (i = 0; i < c; ++i) {
272                 bo->placements[i].fpfn = 0;
273                 bo->placements[i].lpfn = 0;
274         }
275         bo->placement.num_placement = c;
276         bo->placement.num_busy_placement = c;
277 }
278
279 static inline u64 bochs_bo_gpu_offset(struct bochs_bo *bo)
280 {
281         return bo->bo.offset;
282 }
283
284 int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag, u64 *gpu_addr)
285 {
286         int i, ret;
287
288         if (bo->pin_count) {
289                 bo->pin_count++;
290                 if (gpu_addr)
291                         *gpu_addr = bochs_bo_gpu_offset(bo);
292                 return 0;
293         }
294
295         bochs_ttm_placement(bo, pl_flag);
296         for (i = 0; i < bo->placement.num_placement; i++)
297                 bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
298         ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
299         if (ret)
300                 return ret;
301
302         bo->pin_count = 1;
303         if (gpu_addr)
304                 *gpu_addr = bochs_bo_gpu_offset(bo);
305         return 0;
306 }
307
308 int bochs_bo_unpin(struct bochs_bo *bo)
309 {
310         int i, ret;
311
312         if (!bo->pin_count) {
313                 DRM_ERROR("unpin bad %p\n", bo);
314                 return 0;
315         }
316         bo->pin_count--;
317
318         if (bo->pin_count)
319                 return 0;
320
321         for (i = 0; i < bo->placement.num_placement; i++)
322                 bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
323         ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
324         if (ret)
325                 return ret;
326
327         return 0;
328 }
329
330 int bochs_mmap(struct file *filp, struct vm_area_struct *vma)
331 {
332         struct drm_file *file_priv;
333         struct bochs_device *bochs;
334
335         if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
336                 return -EINVAL;
337
338         file_priv = filp->private_data;
339         bochs = file_priv->minor->dev->dev_private;
340         return ttm_bo_mmap(filp, vma, &bochs->ttm.bdev);
341 }
342
343 /* ---------------------------------------------------------------------- */
344
345 static int bochs_bo_create(struct drm_device *dev, int size, int align,
346                            uint32_t flags, struct bochs_bo **pbochsbo)
347 {
348         struct bochs_device *bochs = dev->dev_private;
349         struct bochs_bo *bochsbo;
350         size_t acc_size;
351         int ret;
352
353         bochsbo = kzalloc(sizeof(struct bochs_bo), GFP_KERNEL);
354         if (!bochsbo)
355                 return -ENOMEM;
356
357         ret = drm_gem_object_init(dev, &bochsbo->gem, size);
358         if (ret) {
359                 kfree(bochsbo);
360                 return ret;
361         }
362
363         bochsbo->bo.bdev = &bochs->ttm.bdev;
364         bochsbo->bo.bdev->dev_mapping = dev->anon_inode->i_mapping;
365
366         bochs_ttm_placement(bochsbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
367
368         acc_size = ttm_bo_dma_acc_size(&bochs->ttm.bdev, size,
369                                        sizeof(struct bochs_bo));
370
371         ret = ttm_bo_init(&bochs->ttm.bdev, &bochsbo->bo, size,
372                           ttm_bo_type_device, &bochsbo->placement,
373                           align >> PAGE_SHIFT, false, NULL, acc_size,
374                           NULL, NULL, bochs_bo_ttm_destroy);
375         if (ret)
376                 return ret;
377
378         *pbochsbo = bochsbo;
379         return 0;
380 }
381
382 int bochs_gem_create(struct drm_device *dev, u32 size, bool iskernel,
383                      struct drm_gem_object **obj)
384 {
385         struct bochs_bo *bochsbo;
386         int ret;
387
388         *obj = NULL;
389
390         size = PAGE_ALIGN(size);
391         if (size == 0)
392                 return -EINVAL;
393
394         ret = bochs_bo_create(dev, size, 0, 0, &bochsbo);
395         if (ret) {
396                 if (ret != -ERESTARTSYS)
397                         DRM_ERROR("failed to allocate GEM object\n");
398                 return ret;
399         }
400         *obj = &bochsbo->gem;
401         return 0;
402 }
403
404 int bochs_dumb_create(struct drm_file *file, struct drm_device *dev,
405                       struct drm_mode_create_dumb *args)
406 {
407         struct drm_gem_object *gobj;
408         u32 handle;
409         int ret;
410
411         args->pitch = args->width * ((args->bpp + 7) / 8);
412         args->size = args->pitch * args->height;
413
414         ret = bochs_gem_create(dev, args->size, false,
415                                &gobj);
416         if (ret)
417                 return ret;
418
419         ret = drm_gem_handle_create(file, gobj, &handle);
420         drm_gem_object_unreference_unlocked(gobj);
421         if (ret)
422                 return ret;
423
424         args->handle = handle;
425         return 0;
426 }
427
428 static void bochs_bo_unref(struct bochs_bo **bo)
429 {
430         struct ttm_buffer_object *tbo;
431
432         if ((*bo) == NULL)
433                 return;
434
435         tbo = &((*bo)->bo);
436         ttm_bo_unref(&tbo);
437         *bo = NULL;
438 }
439
440 void bochs_gem_free_object(struct drm_gem_object *obj)
441 {
442         struct bochs_bo *bochs_bo = gem_to_bochs_bo(obj);
443
444         bochs_bo_unref(&bochs_bo);
445 }
446
447 int bochs_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
448                            uint32_t handle, uint64_t *offset)
449 {
450         struct drm_gem_object *obj;
451         struct bochs_bo *bo;
452
453         obj = drm_gem_object_lookup(file, handle);
454         if (obj == NULL)
455                 return -ENOENT;
456
457         bo = gem_to_bochs_bo(obj);
458         *offset = bochs_bo_mmap_offset(bo);
459
460         drm_gem_object_unreference_unlocked(obj);
461         return 0;
462 }
463
464 /* ---------------------------------------------------------------------- */
465
466 static void bochs_user_framebuffer_destroy(struct drm_framebuffer *fb)
467 {
468         struct bochs_framebuffer *bochs_fb = to_bochs_framebuffer(fb);
469
470         drm_gem_object_unreference_unlocked(bochs_fb->obj);
471         drm_framebuffer_cleanup(fb);
472         kfree(fb);
473 }
474
475 static const struct drm_framebuffer_funcs bochs_fb_funcs = {
476         .destroy = bochs_user_framebuffer_destroy,
477 };
478
479 int bochs_framebuffer_init(struct drm_device *dev,
480                            struct bochs_framebuffer *gfb,
481                            const struct drm_mode_fb_cmd2 *mode_cmd,
482                            struct drm_gem_object *obj)
483 {
484         int ret;
485
486         drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
487         gfb->obj = obj;
488         ret = drm_framebuffer_init(dev, &gfb->base, &bochs_fb_funcs);
489         if (ret) {
490                 DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
491                 return ret;
492         }
493         return 0;
494 }
495
496 static struct drm_framebuffer *
497 bochs_user_framebuffer_create(struct drm_device *dev,
498                               struct drm_file *filp,
499                               const struct drm_mode_fb_cmd2 *mode_cmd)
500 {
501         struct drm_gem_object *obj;
502         struct bochs_framebuffer *bochs_fb;
503         int ret;
504
505         DRM_DEBUG_DRIVER("%dx%d, format %c%c%c%c\n",
506                mode_cmd->width, mode_cmd->height,
507                (mode_cmd->pixel_format)       & 0xff,
508                (mode_cmd->pixel_format >> 8)  & 0xff,
509                (mode_cmd->pixel_format >> 16) & 0xff,
510                (mode_cmd->pixel_format >> 24) & 0xff);
511
512         if (mode_cmd->pixel_format != DRM_FORMAT_XRGB8888)
513                 return ERR_PTR(-ENOENT);
514
515         obj = drm_gem_object_lookup(filp, mode_cmd->handles[0]);
516         if (obj == NULL)
517                 return ERR_PTR(-ENOENT);
518
519         bochs_fb = kzalloc(sizeof(*bochs_fb), GFP_KERNEL);
520         if (!bochs_fb) {
521                 drm_gem_object_unreference_unlocked(obj);
522                 return ERR_PTR(-ENOMEM);
523         }
524
525         ret = bochs_framebuffer_init(dev, bochs_fb, mode_cmd, obj);
526         if (ret) {
527                 drm_gem_object_unreference_unlocked(obj);
528                 kfree(bochs_fb);
529                 return ERR_PTR(ret);
530         }
531         return &bochs_fb->base;
532 }
533
534 const struct drm_mode_config_funcs bochs_mode_funcs = {
535         .fb_create = bochs_user_framebuffer_create,
536 };