2 * Copyright (C) 2015 Red Hat, Inc.
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
16 * The above copyright notice and this permission notice shall be included in
17 * all copies or substantial portions of the Software.
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
23 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
24 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
25 * OTHER DEALINGS IN THE SOFTWARE.
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>
35 #include <drm/virtgpu_drm.h>
36 #include "virtgpu_drv.h"
38 #include <linux/delay.h>
40 #define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)
43 virtio_gpu_device *virtio_gpu_get_vgdev(struct ttm_bo_device *bdev)
45 struct virtio_gpu_mman *mman;
46 struct virtio_gpu_device *vgdev;
48 mman = container_of(bdev, struct virtio_gpu_mman, bdev);
49 vgdev = container_of(mman, struct virtio_gpu_device, mman);
53 static int virtio_gpu_ttm_mem_global_init(struct drm_global_reference *ref)
55 return ttm_mem_global_init(ref->object);
58 static void virtio_gpu_ttm_mem_global_release(struct drm_global_reference *ref)
60 ttm_mem_global_release(ref->object);
63 static int virtio_gpu_ttm_global_init(struct virtio_gpu_device *vgdev)
65 struct drm_global_reference *global_ref;
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;
75 r = drm_global_item_ref(global_ref);
77 DRM_ERROR("Failed setting up TTM memory accounting "
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);
91 DRM_ERROR("Failed setting up TTM BO subsystem.\n");
92 drm_global_item_unref(&vgdev->mman.mem_global_ref);
96 vgdev->mman.mem_global_referenced = true;
100 static void virtio_gpu_ttm_global_fini(struct virtio_gpu_device *vgdev)
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;
111 * Hmm, seems to not do anything useful. Leftover debug hack?
112 * Something like printing pagefaults to kernel log?
114 static struct vm_operations_struct virtio_gpu_ttm_vm_ops;
115 static const struct vm_operations_struct *ttm_vm_ops;
117 static int virtio_gpu_ttm_fault(struct vm_fault *vmf)
119 struct ttm_buffer_object *bo;
120 struct virtio_gpu_device *vgdev;
123 bo = (struct ttm_buffer_object *)vmf->vma->vm_private_data;
125 return VM_FAULT_NOPAGE;
126 vgdev = virtio_gpu_get_vgdev(bo->bdev);
127 r = ttm_vm_ops->fault(vmf);
132 int virtio_gpu_mmap(struct file *filp, struct vm_area_struct *vma)
134 struct drm_file *file_priv;
135 struct virtio_gpu_device *vgdev;
138 file_priv = filp->private_data;
139 vgdev = file_priv->minor->dev->dev_private;
142 "filp->private_data->minor->dev->dev_private == NULL\n");
145 r = ttm_bo_mmap(filp, vma, &vgdev->mman.bdev);
147 if (unlikely(r != 0))
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;
154 vma->vm_ops = &virtio_gpu_ttm_vm_ops;
161 static int virtio_gpu_invalidate_caches(struct ttm_bo_device *bdev,
167 static 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)
172 mem->mm_node = (void *)1;
176 static void ttm_bo_man_put_node(struct ttm_mem_type_manager *man,
177 struct ttm_mem_reg *mem)
179 mem->mm_node = (void *)NULL;
183 static int ttm_bo_man_init(struct ttm_mem_type_manager *man,
184 unsigned long p_size)
189 static int ttm_bo_man_takedown(struct ttm_mem_type_manager *man)
194 static void ttm_bo_man_debug(struct ttm_mem_type_manager *man,
199 static const struct ttm_mem_type_manager_func virtio_gpu_bo_manager_func = {
200 .init = ttm_bo_man_init,
201 .takedown = ttm_bo_man_takedown,
202 .get_node = ttm_bo_man_get_node,
203 .put_node = ttm_bo_man_put_node,
204 .debug = ttm_bo_man_debug
207 static int virtio_gpu_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
208 struct ttm_mem_type_manager *man)
210 struct virtio_gpu_device *vgdev;
212 vgdev = virtio_gpu_get_vgdev(bdev);
217 man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
218 man->available_caching = TTM_PL_MASK_CACHING;
219 man->default_caching = TTM_PL_FLAG_CACHED;
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;
228 DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
234 static void virtio_gpu_evict_flags(struct ttm_buffer_object *bo,
235 struct ttm_placement *placement)
237 static struct ttm_place placements = {
240 .flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM,
243 placement->placement = &placements;
244 placement->busy_placement = &placements;
245 placement->num_placement = 1;
246 placement->num_busy_placement = 1;
250 static int virtio_gpu_verify_access(struct ttm_buffer_object *bo,
256 static int virtio_gpu_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
257 struct ttm_mem_reg *mem)
259 struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
261 mem->bus.addr = NULL;
263 mem->bus.size = mem->num_pages << PAGE_SHIFT;
265 mem->bus.is_iomem = false;
266 if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
268 switch (mem->mem_type) {
279 static void virtio_gpu_ttm_io_mem_free(struct ttm_bo_device *bdev,
280 struct ttm_mem_reg *mem)
285 * TTM backend functions.
287 struct virtio_gpu_ttm_tt {
288 struct ttm_dma_tt ttm;
289 struct virtio_gpu_device *vgdev;
293 static int virtio_gpu_ttm_backend_bind(struct ttm_tt *ttm,
294 struct ttm_mem_reg *bo_mem)
296 struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
298 gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
300 WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
301 ttm->num_pages, bo_mem, ttm);
303 /* Not implemented */
307 static int virtio_gpu_ttm_backend_unbind(struct ttm_tt *ttm)
309 /* Not implemented */
313 static void virtio_gpu_ttm_backend_destroy(struct ttm_tt *ttm)
315 struct virtio_gpu_ttm_tt *gtt = (void *)ttm;
317 ttm_dma_tt_fini(>t->ttm);
321 static 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,
327 static int virtio_gpu_ttm_tt_populate(struct ttm_tt *ttm)
329 if (ttm->state != tt_unpopulated)
332 return ttm_pool_populate(ttm);
335 static void virtio_gpu_ttm_tt_unpopulate(struct ttm_tt *ttm)
337 ttm_pool_unpopulate(ttm);
340 static struct ttm_tt *virtio_gpu_ttm_tt_create(struct ttm_bo_device *bdev,
343 struct page *dummy_read_page)
345 struct virtio_gpu_device *vgdev;
346 struct virtio_gpu_ttm_tt *gtt;
348 vgdev = virtio_gpu_get_vgdev(bdev);
349 gtt = kzalloc(sizeof(struct virtio_gpu_ttm_tt), GFP_KERNEL);
352 gtt->ttm.ttm.func = &virtio_gpu_backend_func;
354 if (ttm_dma_tt_init(>t->ttm, bdev, size, page_flags,
359 return >t->ttm.ttm;
362 static void virtio_gpu_move_null(struct ttm_buffer_object *bo,
363 struct ttm_mem_reg *new_mem)
365 struct ttm_mem_reg *old_mem = &bo->mem;
367 BUG_ON(old_mem->mm_node != NULL);
369 new_mem->mm_node = NULL;
372 static int virtio_gpu_bo_move(struct ttm_buffer_object *bo,
373 bool evict, bool interruptible,
375 struct ttm_mem_reg *new_mem)
379 ret = ttm_bo_wait(bo, interruptible, no_wait_gpu);
383 virtio_gpu_move_null(bo, new_mem);
387 static void virtio_gpu_bo_move_notify(struct ttm_buffer_object *tbo,
389 struct ttm_mem_reg *new_mem)
391 struct virtio_gpu_object *bo;
392 struct virtio_gpu_device *vgdev;
394 bo = container_of(tbo, struct virtio_gpu_object, tbo);
395 vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
397 if (!new_mem || (new_mem->placement & TTM_PL_FLAG_SYSTEM)) {
398 if (bo->hw_res_handle)
399 virtio_gpu_cmd_resource_inval_backing(vgdev,
402 } else if (new_mem->placement & TTM_PL_FLAG_TT) {
403 if (bo->hw_res_handle) {
404 virtio_gpu_object_attach(vgdev, bo, bo->hw_res_handle,
410 static void virtio_gpu_bo_swap_notify(struct ttm_buffer_object *tbo)
412 struct virtio_gpu_object *bo;
413 struct virtio_gpu_device *vgdev;
415 bo = container_of(tbo, struct virtio_gpu_object, tbo);
416 vgdev = (struct virtio_gpu_device *)bo->gem_base.dev->dev_private;
419 virtio_gpu_object_free_sg_table(bo);
422 static struct ttm_bo_driver virtio_gpu_bo_driver = {
423 .ttm_tt_create = &virtio_gpu_ttm_tt_create,
424 .ttm_tt_populate = &virtio_gpu_ttm_tt_populate,
425 .ttm_tt_unpopulate = &virtio_gpu_ttm_tt_unpopulate,
426 .invalidate_caches = &virtio_gpu_invalidate_caches,
427 .init_mem_type = &virtio_gpu_init_mem_type,
428 .eviction_valuable = ttm_bo_eviction_valuable,
429 .evict_flags = &virtio_gpu_evict_flags,
430 .move = &virtio_gpu_bo_move,
431 .verify_access = &virtio_gpu_verify_access,
432 .io_mem_reserve = &virtio_gpu_ttm_io_mem_reserve,
433 .io_mem_free = &virtio_gpu_ttm_io_mem_free,
434 .move_notify = &virtio_gpu_bo_move_notify,
435 .swap_notify = &virtio_gpu_bo_swap_notify,
438 int virtio_gpu_ttm_init(struct virtio_gpu_device *vgdev)
442 r = virtio_gpu_ttm_global_init(vgdev);
445 /* No others user of address space so set it to 0 */
446 r = ttm_bo_device_init(&vgdev->mman.bdev,
447 vgdev->mman.bo_global_ref.ref.object,
448 &virtio_gpu_bo_driver,
449 vgdev->ddev->anon_inode->i_mapping,
450 DRM_FILE_PAGE_OFFSET, 0);
452 DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
456 r = ttm_bo_init_mm(&vgdev->mman.bdev, TTM_PL_TT, 0);
458 DRM_ERROR("Failed initializing GTT heap.\n");
464 ttm_bo_device_release(&vgdev->mman.bdev);
466 virtio_gpu_ttm_global_fini(vgdev);
470 void virtio_gpu_ttm_fini(struct virtio_gpu_device *vgdev)
472 ttm_bo_device_release(&vgdev->mman.bdev);
473 virtio_gpu_ttm_global_fini(vgdev);
474 DRM_INFO("virtio_gpu: ttm finalized\n");