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28#include <drm/ttm/ttm_bo_api.h>
29#include <drm/ttm/ttm_bo_driver.h>
30#include <drm/ttm/ttm_placement.h>
31#include <drm/ttm/ttm_page_alloc.h>
32#include <drm/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_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 *)vmf->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(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}
181
182static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
183 unsigned long p_size)
184{
185 return 0;
186}
187
188static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
189{
190 return 0;
191}
192
193static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
194 struct drm_printer *printer)
195{
196}
197
198static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
199 .init = ttm_bo_man_init,
200 .takedown = ttm_bo_man_takedown,
201 .get_node = ttm_bo_man_get_node,
202 .put_node = ttm_bo_man_put_node,
203 .debug = ttm_bo_man_debug
204};
205
206static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
207 struct ttm_mem_type_manager *man)
208{
209 struct virtio_gpu_device *vgdev;
210
211 vgdev = virtio_gpu_get_vgdev(bdev);
212
213 switch (type) {
214 case TTM_PL_SYSTEM:
215
216 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
217 man->available_caching = TTM_PL_MASK_CACHING;
218 man->default_caching = TTM_PL_FLAG_CACHED;
219 break;
220 case TTM_PL_TT:
221 man->func = &virtio_gpu_bo_manager_func;
222 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
223 man->available_caching = TTM_PL_MASK_CACHING;
224 man->default_caching = TTM_PL_FLAG_CACHED;
225 break;
226 default:
227 DRM_ERROR("Unsupported memory type %u\n", (unsigned int)type);
228 return -EINVAL;
229 }
230 return 0;
231}
232
233static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
234 struct ttm_placement *placement)
235{
236 static const struct ttm_place placements = {
237 .fpfn = 0,
238 .lpfn = 0,
239 .flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
240 };
241
242 placement->placement = &placements;
243 placement->busy_placement = &placements;
244 placement->num_placement = 1;
245 placement->num_busy_placement = 1;
246}
247
248static int virtio_gpu_verify_access(struct ttm_buffer_object *bo,
249 struct file *filp)
250{
251 return 0;
252}
253
254static int virtio_gpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
255 struct ttm_mem_reg *mem)
256{
257 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
258
259 mem->bus.addr = NULL;
260 mem->bus.offset = 0;
261 mem->bus.size = mem->num_pages << PAGE_SHIFT;
262 mem->bus.base = 0;
263 mem->bus.is_iomem = false;
264 if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
265 return -EINVAL;
266 switch (mem->mem_type) {
267 case TTM_PL_SYSTEM:
268 case TTM_PL_TT:
269
270 return 0;
271 default:
272 return -EINVAL;
273 }
274 return 0;
275}
276
277static void virtio_gpu_ttm_io_mem_free(struct ttm_bo_device *bdev,
278 struct ttm_mem_reg *mem)
279{
280}
281
282
283
284
285struct virtio_gpu_ttm_tt {
286 struct ttm_dma_tt ttm;
287 struct virtio_gpu_device *vgdev;
288 u64 offset;
289};
290
291static int virtio_gpu_ttm_backend_bind(struct ttm_tt *ttm,
292 struct ttm_mem_reg *bo_mem)
293{
294 struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
295
296 gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
297 if (!ttm->num_pages)
298 WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
299 ttm->num_pages, bo_mem, ttm);
300
301
302 return 0;
303}
304
305static int virtio_gpu_ttm_backend_unbind(struct ttm_tt *ttm)
306{
307
308 return 0;
309}
310
311static void virtio_gpu_ttm_backend_destroy(struct ttm_tt *ttm)
312{
313 struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
314
315 ttm_dma_tt_fini(>t->ttm);
316 kfree(gtt);
317}
318
319static struct ttm_backend_func virtio_gpu_backend_func = {
320 .bind = &virtio_gpu_ttm_backend_bind,
321 .unbind = &virtio_gpu_ttm_backend_unbind,
322 .destroy = &virtio_gpu_ttm_backend_destroy,
323};
324
325static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_buffer_object *bo,
326 uint32_t page_flags)
327{
328 struct virtio_gpu_device *vgdev;
329 struct virtio_gpu_ttm_tt *gtt;
330
331 vgdev = virtio_gpu_get_vgdev(bo->bdev);
332 gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
333 if (gtt == NULL)
334 return NULL;
335 gtt->ttm.ttm.func = &virtio_gpu_backend_func;
336 gtt->vgdev = vgdev;
337 if (ttm_dma_tt_init(>t->ttm, bo, page_flags)) {
338 kfree(gtt);
339 return NULL;
340 }
341 return >t->ttm.ttm;
342}
343
344static void virtio_gpu_move_null(struct ttm_buffer_object *bo,
345 struct ttm_mem_reg *new_mem)
346{
347 struct ttm_mem_reg *old_mem = &bo->mem;
348
349 BUG_ON(old_mem->mm_node != NULL);
350 *old_mem = *new_mem;
351 new_mem->mm_node = NULL;
352}
353
354static int virtio_gpu_bo_move(struct ttm_buffer_object *bo, bool evict,
355 struct ttm_operation_ctx *ctx,
356 struct ttm_mem_reg *new_mem)
357{
358 int ret;
359
360 ret = ttm_bo_wait(bo, ctx->interruptible, ctx->no_wait_gpu);
361 if (ret)
362 return ret;
363
364 virtio_gpu_move_null(bo, new_mem);
365 return 0;
366}
367
368static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo,
369 bool evict,
370 struct ttm_mem_reg *new_mem)
371{
372 struct virtio_gpu_object *bo;
373 struct virtio_gpu_device *vgdev;
374
375 bo = container_of(tbo, struct virtio_gpu_object, tbo);
376 vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
377
378 if (!new_mem || (new_mem->placement & TTM_PL_FLAG_SYSTEM)) {
379 if (bo->hw_res_handle)
380 virtio_gpu_cmd_resource_inval_backing(vgdev,
381 bo->hw_res_handle);
382
383 } else if (new_mem->placement & TTM_PL_FLAG_TT) {
384 if (bo->hw_res_handle) {
385 virtio_gpu_object_attach(vgdev, bo, bo->hw_res_handle,
386 NULL);
387 }
388 }
389}
390
391static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo)
392{
393 struct virtio_gpu_object *bo;
394 struct virtio_gpu_device *vgdev;
395
396 bo = container_of(tbo, struct virtio_gpu_object, tbo);
397 vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
398
399 if (bo->pages)
400 virtio_gpu_object_free_sg_table(bo);
401}
402
403static struct ttm_bo_driver virtio_gpu_bo_driver = {
404 .ttm_tt_create = &virtio_gpu_ttm_tt_create,
405 .invalidate_caches = &virtio_gpu_invalidate_caches,
406 .init_mem_type = &virtio_gpu_init_mem_type,
407 .eviction_valuable = ttm_bo_eviction_valuable,
408 .evict_flags = &virtio_gpu_evict_flags,
409 .move = &virtio_gpu_bo_move,
410 .verify_access = &virtio_gpu_verify_access,
411 .io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
412 .io_mem_free = &virtio_gpu_ttm_io_mem_free,
413 .move_notify = &virtio_gpu_bo_move_notify,
414 .swap_notify = &virtio_gpu_bo_swap_notify,
415};
416
417int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
418{
419 int r;
420
421 r = virtio_gpu_ttm_global_init(vgdev);
422 if (r)
423 return r;
424
425 r = ttm_bo_device_init(&vgdev->mman.bdev,
426 vgdev->mman.bo_global_ref.ref.object,
427 &virtio_gpu_bo_driver,
428 vgdev->ddev->anon_inode->i_mapping,
429 DRM_FILE_PAGE_OFFSET, 0);
430 if (r) {
431 DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
432 goto err_dev_init;
433 }
434
435 r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
436 if (r) {
437 DRM_ERROR("Failed initializing GTT heap.\n");
438 goto err_mm_init;
439 }
440 return 0;
441
442err_mm_init:
443 ttm_bo_device_release(&vgdev->mman.bdev);
444err_dev_init:
445 virtio_gpu_ttm_global_fini(vgdev);
446 return r;
447}
448
449void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
450{
451 ttm_bo_device_release(&vgdev->mman.bdev);
452 virtio_gpu_ttm_global_fini(vgdev);
453 DRM_INFO("virtio_gpu: ttm finalized\n");
454}
455
