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