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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, 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 /* system memory */
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 int bochs_bo_move(struct ttm_buffer_object *bo,
169 bool evict, bool interruptible,
170 bool no_wait_gpu,
171 struct ttm_mem_reg *new_mem)
172{
173 return ttm_bo_move_memcpy(bo, evict, no_wait_gpu, new_mem);
174}
175
176
177static void bochs_ttm_backend_destroy(struct ttm_tt *tt)
178{
179 ttm_tt_fini(tt);
180 kfree(tt);
181}
182
183static struct ttm_backend_func bochs_tt_backend_func = {
184 .destroy = &bochs_ttm_backend_destroy,
185};
186
187static struct ttm_tt *bochs_ttm_tt_create(struct ttm_bo_device *bdev,
188 unsigned long size,
189 uint32_t page_flags,
190 struct page *dummy_read_page)
191{
192 struct ttm_tt *tt;
193
194 tt = kzalloc(sizeof(struct ttm_tt), GFP_KERNEL);
195 if (tt == NULL)
196 return NULL;
197 tt->func = &bochs_tt_backend_func;
198 if (ttm_tt_init(tt, bdev, size, page_flags, dummy_read_page)) {
199 kfree(tt);
200 return NULL;
201 }
202 return tt;
203}
204
205struct ttm_bo_driver bochs_bo_driver = {
206 .ttm_tt_create = bochs_ttm_tt_create,
207 .ttm_tt_populate = ttm_pool_populate,
208 .ttm_tt_unpopulate = ttm_pool_unpopulate,
209 .init_mem_type = bochs_bo_init_mem_type,
210 .evict_flags = bochs_bo_evict_flags,
211 .move = bochs_bo_move,
212 .verify_access = bochs_bo_verify_access,
213 .io_mem_reserve = &bochs_ttm_io_mem_reserve,
214 .io_mem_free = &bochs_ttm_io_mem_free,
215};
216
217int bochs_mm_init(struct bochs_device *bochs)
218{
219 struct ttm_bo_device *bdev = &bochs->ttm.bdev;
220 int ret;
221
222 ret = bochs_ttm_global_init(bochs);
223 if (ret)
224 return ret;
225
226 ret = ttm_bo_device_init(&bochs->ttm.bdev,
227 bochs->ttm.bo_global_ref.ref.object,
228 &bochs_bo_driver,
229 bochs->dev->anon_inode->i_mapping,
230 DRM_FILE_PAGE_OFFSET,
231 true);
232 if (ret) {
233 DRM_ERROR("Error initialising bo driver; %d\n", ret);
234 return ret;
235 }
236
237 ret = ttm_bo_init_mm(bdev, TTM_PL_VRAM,
238 bochs->fb_size >> PAGE_SHIFT);
239 if (ret) {
240 DRM_ERROR("Failed ttm VRAM init: %d\n", ret);
241 return ret;
242 }
243
244 bochs->ttm.initialized = true;
245 return 0;
246}
247
248void bochs_mm_fini(struct bochs_device *bochs)
249{
250 if (!bochs->ttm.initialized)
251 return;
252
253 ttm_bo_device_release(&bochs->ttm.bdev);
254 bochs_ttm_global_release(bochs);
255 bochs->ttm.initialized = false;
256}
257
258static void bochs_ttm_placement(struct bochs_bo *bo, int domain)
259{
260 unsigned i;
261 u32 c = 0;
262 bo->placement.placement = bo->placements;
263 bo->placement.busy_placement = bo->placements;
264 if (domain & TTM_PL_FLAG_VRAM) {
265 bo->placements[c++].flags = TTM_PL_FLAG_WC
266 | TTM_PL_FLAG_UNCACHED
267 | TTM_PL_FLAG_VRAM;
268 }
269 if (domain & TTM_PL_FLAG_SYSTEM) {
270 bo->placements[c++].flags = TTM_PL_MASK_CACHING
271 | TTM_PL_FLAG_SYSTEM;
272 }
273 if (!c) {
274 bo->placements[c++].flags = TTM_PL_MASK_CACHING
275 | TTM_PL_FLAG_SYSTEM;
276 }
277 for (i = 0; i < c; ++i) {
278 bo->placements[i].fpfn = 0;
279 bo->placements[i].lpfn = 0;
280 }
281 bo->placement.num_placement = c;
282 bo->placement.num_busy_placement = c;
283}
284
285static inline u64 bochs_bo_gpu_offset(struct bochs_bo *bo)
286{
287 return bo->bo.offset;
288}
289
290int bochs_bo_pin(struct bochs_bo *bo, u32 pl_flag, u64 *gpu_addr)
291{
292 int i, ret;
293
294 if (bo->pin_count) {
295 bo->pin_count++;
296 if (gpu_addr)
297 *gpu_addr = bochs_bo_gpu_offset(bo);
298 return 0;
299 }
300
301 bochs_ttm_placement(bo, pl_flag);
302 for (i = 0; i < bo->placement.num_placement; i++)
303 bo->placements[i].flags |= TTM_PL_FLAG_NO_EVICT;
304 ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
305 if (ret)
306 return ret;
307
308 bo->pin_count = 1;
309 if (gpu_addr)
310 *gpu_addr = bochs_bo_gpu_offset(bo);
311 return 0;
312}
313
314int bochs_bo_unpin(struct bochs_bo *bo)
315{
316 int i, ret;
317
318 if (!bo->pin_count) {
319 DRM_ERROR("unpin bad %p\n", bo);
320 return 0;
321 }
322 bo->pin_count--;
323
324 if (bo->pin_count)
325 return 0;
326
327 for (i = 0; i < bo->placement.num_placement; i++)
328 bo->placements[i].flags &= ~TTM_PL_FLAG_NO_EVICT;
329 ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
330 if (ret)
331 return ret;
332
333 return 0;
334}
335
336int bochs_mmap(struct file *filp, struct vm_area_struct *vma)
337{
338 struct drm_file *file_priv;
339 struct bochs_device *bochs;
340
341 if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
342 return -EINVAL;
343
344 file_priv = filp->private_data;
345 bochs = file_priv->minor->dev->dev_private;
346 return ttm_bo_mmap(filp, vma, &bochs->ttm.bdev);
347}
348
349/* ---------------------------------------------------------------------- */
350
351static int bochs_bo_create(struct drm_device *dev, int size, int align,
352 uint32_t flags, struct bochs_bo **pbochsbo)
353{
354 struct bochs_device *bochs = dev->dev_private;
355 struct bochs_bo *bochsbo;
356 size_t acc_size;
357 int ret;
358
359 bochsbo = kzalloc(sizeof(struct bochs_bo), GFP_KERNEL);
360 if (!bochsbo)
361 return -ENOMEM;
362
363 ret = drm_gem_object_init(dev, &bochsbo->gem, size);
364 if (ret) {
365 kfree(bochsbo);
366 return ret;
367 }
368
369 bochsbo->bo.bdev = &bochs->ttm.bdev;
370 bochsbo->bo.bdev->dev_mapping = dev->anon_inode->i_mapping;
371
372 bochs_ttm_placement(bochsbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);
373
374 acc_size = ttm_bo_dma_acc_size(&bochs->ttm.bdev, size,
375 sizeof(struct bochs_bo));
376
377 ret = ttm_bo_init(&bochs->ttm.bdev, &bochsbo->bo, size,
378 ttm_bo_type_device, &bochsbo->placement,
379 align >> PAGE_SHIFT, false, NULL, acc_size,
380 NULL, NULL, bochs_bo_ttm_destroy);
381 if (ret)
382 return ret;
383
384 *pbochsbo = bochsbo;
385 return 0;
386}
387
388int bochs_gem_create(struct drm_device *dev, u32 size, bool iskernel,
389 struct drm_gem_object **obj)
390{
391 struct bochs_bo *bochsbo;
392 int ret;
393
394 *obj = NULL;
395
396 size = PAGE_ALIGN(size);
397 if (size == 0)
398 return -EINVAL;
399
400 ret = bochs_bo_create(dev, size, 0, 0, &bochsbo);
401 if (ret) {
402 if (ret != -ERESTARTSYS)
403 DRM_ERROR("failed to allocate GEM object\n");
404 return ret;
405 }
406 *obj = &bochsbo->gem;
407 return 0;
408}
409
410int bochs_dumb_create(struct drm_file *file, struct drm_device *dev,
411 struct drm_mode_create_dumb *args)
412{
413 struct drm_gem_object *gobj;
414 u32 handle;
415 int ret;
416
417 args->pitch = args->width * ((args->bpp + 7) / 8);
418 args->size = args->pitch * args->height;
419
420 ret = bochs_gem_create(dev, args->size, false,
421 &gobj);
422 if (ret)
423 return ret;
424
425 ret = drm_gem_handle_create(file, gobj, &handle);
426 drm_gem_object_unreference_unlocked(gobj);
427 if (ret)
428 return ret;
429
430 args->handle = handle;
431 return 0;
432}
433
434static void bochs_bo_unref(struct bochs_bo **bo)
435{
436 struct ttm_buffer_object *tbo;
437
438 if ((*bo) == NULL)
439 return;
440
441 tbo = &((*bo)->bo);
442 ttm_bo_unref(&tbo);
443 *bo = NULL;
444}
445
446void bochs_gem_free_object(struct drm_gem_object *obj)
447{
448 struct bochs_bo *bochs_bo = gem_to_bochs_bo(obj);
449
450 bochs_bo_unref(&bochs_bo);
451}
452
453int bochs_dumb_mmap_offset(struct drm_file *file, struct drm_device *dev,
454 uint32_t handle, uint64_t *offset)
455{
456 struct drm_gem_object *obj;
457 struct bochs_bo *bo;
458
459 obj = drm_gem_object_lookup(dev, file, handle);
460 if (obj == NULL)
461 return -ENOENT;
462
463 bo = gem_to_bochs_bo(obj);
464 *offset = bochs_bo_mmap_offset(bo);
465
466 drm_gem_object_unreference_unlocked(obj);
467 return 0;
468}
469
470/* ---------------------------------------------------------------------- */
471
472static void bochs_user_framebuffer_destroy(struct drm_framebuffer *fb)
473{
474 struct bochs_framebuffer *bochs_fb = to_bochs_framebuffer(fb);
475 if (bochs_fb->obj)
476 drm_gem_object_unreference_unlocked(bochs_fb->obj);
477 drm_framebuffer_cleanup(fb);
478 kfree(fb);
479}
480
481static const struct drm_framebuffer_funcs bochs_fb_funcs = {
482 .destroy = bochs_user_framebuffer_destroy,
483};
484
485int bochs_framebuffer_init(struct drm_device *dev,
486 struct bochs_framebuffer *gfb,
487 const struct drm_mode_fb_cmd2 *mode_cmd,
488 struct drm_gem_object *obj)
489{
490 int ret;
491
492 drm_helper_mode_fill_fb_struct(&gfb->base, mode_cmd);
493 gfb->obj = obj;
494 ret = drm_framebuffer_init(dev, &gfb->base, &bochs_fb_funcs);
495 if (ret) {
496 DRM_ERROR("drm_framebuffer_init failed: %d\n", ret);
497 return ret;
498 }
499 return 0;
500}
501
502static struct drm_framebuffer *
503bochs_user_framebuffer_create(struct drm_device *dev,
504 struct drm_file *filp,
505 const struct drm_mode_fb_cmd2 *mode_cmd)
506{
507 struct drm_gem_object *obj;
508 struct bochs_framebuffer *bochs_fb;
509 int ret;
510
511 DRM_DEBUG_DRIVER("%dx%d, format %c%c%c%c\n",
512 mode_cmd->width, mode_cmd->height,
513 (mode_cmd->pixel_format) & 0xff,
514 (mode_cmd->pixel_format >> 8) & 0xff,
515 (mode_cmd->pixel_format >> 16) & 0xff,
516 (mode_cmd->pixel_format >> 24) & 0xff);
517
518 if (mode_cmd->pixel_format != DRM_FORMAT_XRGB8888)
519 return ERR_PTR(-ENOENT);
520
521 obj = drm_gem_object_lookup(dev, filp, mode_cmd->handles[0]);
522 if (obj == NULL)
523 return ERR_PTR(-ENOENT);
524
525 bochs_fb = kzalloc(sizeof(*bochs_fb), GFP_KERNEL);
526 if (!bochs_fb) {
527 drm_gem_object_unreference_unlocked(obj);
528 return ERR_PTR(-ENOMEM);
529 }
530
531 ret = bochs_framebuffer_init(dev, bochs_fb, mode_cmd, obj);
532 if (ret) {
533 drm_gem_object_unreference_unlocked(obj);
534 kfree(bochs_fb);
535 return ERR_PTR(ret);
536 }
537 return &bochs_fb->base;
538}
539
540const struct drm_mode_config_funcs bochs_mode_funcs = {
541 .fb_create = bochs_user_framebuffer_create,
542};
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 */
4
5#include "bochs.h"
6
7/* ---------------------------------------------------------------------- */
8
9int bochs_mm_init(struct bochs_device *bochs)
10{
11 struct drm_vram_mm *vmm;
12
13 vmm = drm_vram_helper_alloc_mm(bochs->dev, bochs->fb_base,
14 bochs->fb_size,
15 &drm_gem_vram_mm_funcs);
16 return PTR_ERR_OR_ZERO(vmm);
17}
18
19void bochs_mm_fini(struct bochs_device *bochs)
20{
21 if (!bochs->dev->vram_mm)
22 return;
23
24 drm_vram_helper_release_mm(bochs->dev);
25}