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