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28#include <ttm/ttm_bo_api.h>
29#include <ttm/ttm_bo_driver.h>
30#include <ttm/ttm_placement.h>
31#include <ttm/ttm_page_alloc.h>
32#include <ttm/ttm_module.h>
33#include <drm/drmP.h>
34#include <drm/drm.h>
35#include <drm/virtgpu_drm.h>
36#include "virtgpu_drv.h"
37
38#include <linux/delay.h>
39
40#define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)
41
42static struct
43virtio_gpu_device *virtio_gpu_get_vgdev(struct ttm_bo_device *bdev)
44{
45 struct virtio_gpu_mman *mman;
46 struct virtio_gpu_device *vgdev;
47
48 mman = container_of(bdev, struct virtio_gpu_mman, bdev);
49 vgdev = container_of(mman, struct virtio_gpu_device, mman);
50 return vgdev;
51}
52
53static int virtio_gpu_ttm_mem_global_init(struct drm_global_reference *ref)
54{
55 return ttm_mem_global_init(ref->object);
56}
57
58static void virtio_gpu_ttm_mem_global_release(struct drm_global_reference *ref)
59{
60 ttm_mem_global_release(ref->object);
61}
62
63static int virtio_gpu_ttm_global_init(struct virtio_gpu_device *vgdev)
64{
65 struct drm_global_reference *global_ref;
66 int r;
67
68 vgdev->mman.mem_global_referenced = false;
69 global_ref = &vgdev->mman.mem_global_ref;
70 global_ref->global_type = DRM_GLOBAL_TTM_MEM;
71 global_ref->size = sizeof(struct ttm_mem_global);
72 global_ref->init = &virtio_gpu_ttm_mem_global_init;
73 global_ref->release = &virtio_gpu_ttm_mem_global_release;
74
75 r = drm_global_item_ref(global_ref);
76 if (r != 0) {
77 DRM_ERROR("Failed setting up TTM memory accounting "
78 "subsystem.\n");
79 return r;
80 }
81
82 vgdev->mman.bo_global_ref.mem_glob =
83 vgdev->mman.mem_global_ref.object;
84 global_ref = &vgdev->mman.bo_global_ref.ref;
85 global_ref->global_type = DRM_GLOBAL_TTM_BO;
86 global_ref->size = sizeof(struct ttm_bo_global);
87 global_ref->init = &ttm_bo_global_init;
88 global_ref->release = &ttm_bo_global_release;
89 r = drm_global_item_ref(global_ref);
90 if (r != 0) {
91 DRM_ERROR("Failed setting up TTM BO subsystem.\n");
92 drm_global_item_unref(&vgdev->mman.mem_global_ref);
93 return r;
94 }
95
96 vgdev->mman.mem_global_referenced = true;
97 return 0;
98}
99
100static void virtio_gpu_ttm_global_fini(struct virtio_gpu_device *vgdev)
101{
102 if (vgdev->mman.mem_global_referenced) {
103 drm_global_item_unref(&vgdev->mman.bo_global_ref.ref);
104 drm_global_item_unref(&vgdev->mman.mem_global_ref);
105 vgdev->mman.mem_global_referenced = false;
106 }
107}
108
109#if 0
110
111
112
113
114static struct vm_operations_struct virtio_gpu_ttm_vm_ops;
115static const struct vm_operations_struct *ttm_vm_ops;
116
117static int virtio_gpu_ttm_fault(struct vm_area_struct *vma,
118 struct vm_fault *vmf)
119{
120 struct ttm_buffer_object *bo;
121 struct virtio_gpu_device *vgdev;
122 int r;
123
124 bo = (struct ttm_buffer_object *)vma->vm_private_data;
125 if (bo == NULL)
126 return VM_FAULT_NOPAGE;
127 vgdev = virtio_gpu_get_vgdev(bo->bdev);
128 r = ttm_vm_ops->fault(vma, vmf);
129 return r;
130}
131#endif
132
133int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma)
134{
135 struct drm_file *file_priv;
136 struct virtio_gpu_device *vgdev;
137 int r;
138
139 file_priv = filp->private_data;
140 vgdev = file_priv->minor->dev->dev_private;
141 if (vgdev == NULL) {
142 DRM_ERROR(
143 "filp->private_data->minor->dev->dev_private == NULL\n");
144 return -EINVAL;
145 }
146 r = ttm_bo_mmap(filp, vma, &vgdev->mman.bdev);
147#if 0
148 if (unlikely(r != 0))
149 return r;
150 if (unlikely(ttm_vm_ops == NULL)) {
151 ttm_vm_ops = vma->vm_ops;
152 virtio_gpu_ttm_vm_ops = *ttm_vm_ops;
153 virtio_gpu_ttm_vm_ops.fault = &virtio_gpu_ttm_fault;
154 }
155 vma->vm_ops = &virtio_gpu_ttm_vm_ops;
156 return 0;
157#else
158 return r;
159#endif
160}
161
162static int virtio_gpu_invalidate_caches(struct ttm_bo_device *bdev,
163 uint32_t flags)
164{
165 return 0;
166}
167
168static int ttm_bo_man_get_node(struct ttm_mem_type_manager *man,
169 struct ttm_buffer_object *bo,
170 const struct ttm_place *place,
171 struct ttm_mem_reg *mem)
172{
173 mem->mm_node = (void *)1;
174 return 0;
175}
176
177static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
178 struct ttm_mem_reg *mem)
179{
180 mem->mm_node = (void *)NULL;
181 return;
182}
183
184static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
185 unsigned long p_size)
186{
187 return 0;
188}
189
190static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
191{
192 return 0;
193}
194
195static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
196 const char *prefix)
197{
198}
199
200static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
201 ttm_bo_man_init,
202 ttm_bo_man_takedown,
203 ttm_bo_man_get_node,
204 ttm_bo_man_put_node,
205 ttm_bo_man_debug
206};
207
208static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
209 struct ttm_mem_type_manager *man)
210{
211 struct virtio_gpu_device *vgdev;
212
213 vgdev = virtio_gpu_get_vgdev(bdev);
214
215 switch (type) {
216 case TTM_PL_SYSTEM:
217
218 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
219 man->available_caching = TTM_PL_MASK_CACHING;
220 man->default_caching = TTM_PL_FLAG_CACHED;
221 break;
222 case TTM_PL_TT:
223 man->func = &virtio_gpu_bo_manager_func;
224 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
225 man->available_caching = TTM_PL_MASK_CACHING;
226 man->default_caching = TTM_PL_FLAG_CACHED;
227 break;
228 default:
229 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
230 return -EINVAL;
231 }
232 return 0;
233}
234
235static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
236 struct ttm_placement *placement)
237{
238 static struct ttm_place placements = {
239 .fpfn = 0,
240 .lpfn = 0,
241 .flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
242 };
243
244 placement->placement = &placements;
245 placement->busy_placement = &placements;
246 placement->num_placement = 1;
247 placement->num_busy_placement = 1;
248 return;
249}
250
251static int virtio_gpu_verify_access(struct ttm_buffer_object *bo,
252 struct file *filp)
253{
254 return 0;
255}
256
257static int virtio_gpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
258 struct ttm_mem_reg *mem)
259{
260 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
261
262 mem->bus.addr = NULL;
263 mem->bus.offset = 0;
264 mem->bus.size = mem->num_pages << PAGE_SHIFT;
265 mem->bus.base = 0;
266 mem->bus.is_iomem = false;
267 if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
268 return -EINVAL;
269 switch (mem->mem_type) {
270 case TTM_PL_SYSTEM:
271 case TTM_PL_TT:
272
273 return 0;
274 default:
275 return -EINVAL;
276 }
277 return 0;
278}
279
280static void virtio_gpu_ttm_io_mem_free(struct ttm_bo_device *bdev,
281 struct ttm_mem_reg *mem)
282{
283}
284
285
286
287
288struct virtio_gpu_ttm_tt {
289 struct ttm_dma_tt ttm;
290 struct virtio_gpu_device *vgdev;
291 u64 offset;
292};
293
294static int virtio_gpu_ttm_backend_bind(struct ttm_tt *ttm,
295 struct ttm_mem_reg *bo_mem)
296{
297 struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
298
299 gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
300 if (!ttm->num_pages)
301 WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
302 ttm->num_pages, bo_mem, ttm);
303
304
305 return 0;
306}
307
308static int virtio_gpu_ttm_backend_unbind(struct ttm_tt *ttm)
309{
310
311 return 0;
312}
313
314static void virtio_gpu_ttm_backend_destroy(struct ttm_tt *ttm)
315{
316 struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
317
318 ttm_dma_tt_fini(>t->ttm);
319 kfree(gtt);
320}
321
322static struct ttm_backend_func virtio_gpu_backend_func = {
323 .bind = &virtio_gpu_ttm_backend_bind,
324 .unbind = &virtio_gpu_ttm_backend_unbind,
325 .destroy = &virtio_gpu_ttm_backend_destroy,
326};
327
328static int virtio_gpu_ttm_tt_populate(struct ttm_tt *ttm)
329{
330 if (ttm->state != tt_unpopulated)
331 return 0;
332
333 return ttm_pool_populate(ttm);
334}
335
336static void virtio_gpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
337{
338 ttm_pool_unpopulate(ttm);
339}
340
341static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_bo_device *bdev,
342 unsigned long size,
343 uint32_t page_flags,
344 struct page *dummy_read_page)
345{
346 struct virtio_gpu_device *vgdev;
347 struct virtio_gpu_ttm_tt *gtt;
348
349 vgdev = virtio_gpu_get_vgdev(bdev);
350 gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
351 if (gtt == NULL)
352 return NULL;
353 gtt->ttm.ttm.func = &virtio_gpu_backend_func;
354 gtt->vgdev = vgdev;
355 if (ttm_dma_tt_init(>t->ttm, bdev, size, page_flags,
356 dummy_read_page)) {
357 kfree(gtt);
358 return NULL;
359 }
360 return >t->ttm.ttm;
361}
362
363static void virtio_gpu_move_null(struct ttm_buffer_object *bo,
364 struct ttm_mem_reg *new_mem)
365{
366 struct ttm_mem_reg *old_mem = &bo->mem;
367
368 BUG_ON(old_mem->mm_node != NULL);
369 *old_mem = *new_mem;
370 new_mem->mm_node = NULL;
371}
372
373static int virtio_gpu_bo_move(struct ttm_buffer_object *bo,
374 bool evict, bool interruptible,
375 bool no_wait_gpu,
376 struct ttm_mem_reg *new_mem)
377{
378 virtio_gpu_move_null(bo, new_mem);
379 return 0;
380}
381
382static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo,
383 struct ttm_mem_reg *new_mem)
384{
385 struct virtio_gpu_object *bo;
386 struct virtio_gpu_device *vgdev;
387
388 bo = container_of(tbo, struct virtio_gpu_object, tbo);
389 vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
390
391 if (!new_mem || (new_mem->placement & TTM_PL_FLAG_SYSTEM)) {
392 if (bo->hw_res_handle)
393 virtio_gpu_cmd_resource_inval_backing(vgdev,
394 bo->hw_res_handle);
395
396 } else if (new_mem->placement & TTM_PL_FLAG_TT) {
397 if (bo->hw_res_handle) {
398 virtio_gpu_object_attach(vgdev, bo, bo->hw_res_handle,
399 NULL);
400 }
401 }
402}
403
404static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo)
405{
406 struct virtio_gpu_object *bo;
407 struct virtio_gpu_device *vgdev;
408
409 bo = container_of(tbo, struct virtio_gpu_object, tbo);
410 vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
411
412 if (bo->pages)
413 virtio_gpu_object_free_sg_table(bo);
414}
415
416static struct ttm_bo_driver virtio_gpu_bo_driver = {
417 .ttm_tt_create = &virtio_gpu_ttm_tt_create,
418 .ttm_tt_populate = &virtio_gpu_ttm_tt_populate,
419 .ttm_tt_unpopulate = &virtio_gpu_ttm_tt_unpopulate,
420 .invalidate_caches = &virtio_gpu_invalidate_caches,
421 .init_mem_type = &virtio_gpu_init_mem_type,
422 .evict_flags = &virtio_gpu_evict_flags,
423 .move = &virtio_gpu_bo_move,
424 .verify_access = &virtio_gpu_verify_access,
425 .io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
426 .io_mem_free = &virtio_gpu_ttm_io_mem_free,
427 .move_notify = &virtio_gpu_bo_move_notify,
428 .swap_notify = &virtio_gpu_bo_swap_notify,
429};
430
431int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
432{
433 int r;
434
435 r = virtio_gpu_ttm_global_init(vgdev);
436 if (r)
437 return r;
438
439 r = ttm_bo_device_init(&vgdev->mman.bdev,
440 vgdev->mman.bo_global_ref.ref.object,
441 &virtio_gpu_bo_driver,
442 vgdev->ddev->anon_inode->i_mapping,
443 DRM_FILE_PAGE_OFFSET, 0);
444 if (r) {
445 DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
446 goto err_dev_init;
447 }
448
449 r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
450 if (r) {
451 DRM_ERROR("Failed initializing GTT heap.\n");
452 goto err_mm_init;
453 }
454 return 0;
455
456err_mm_init:
457 ttm_bo_device_release(&vgdev->mman.bdev);
458err_dev_init:
459 virtio_gpu_ttm_global_fini(vgdev);
460 return r;
461}
462
463void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
464{
465 ttm_bo_device_release(&vgdev->mman.bdev);
466 virtio_gpu_ttm_global_fini(vgdev);
467 DRM_INFO("virtio_gpu: ttm finalized\n");
468}
469
