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