xref: /openbmc/linux/drivers/gpu/drm/qxl/qxl_ttm.c (revision 6aa7de05)
1 /*
2  * Copyright 2013 Red Hat Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  * Authors: Dave Airlie
23  *          Alon Levy
24  */
25 
26 #include <drm/ttm/ttm_bo_api.h>
27 #include <drm/ttm/ttm_bo_driver.h>
28 #include <drm/ttm/ttm_placement.h>
29 #include <drm/ttm/ttm_page_alloc.h>
30 #include <drm/ttm/ttm_module.h>
31 #include <drm/drmP.h>
32 #include <drm/drm.h>
33 #include <drm/qxl_drm.h>
34 #include "qxl_drv.h"
35 #include "qxl_object.h"
36 
37 #include <linux/delay.h>
38 
39 static struct qxl_device *qxl_get_qdev(struct ttm_bo_device *bdev)
40 {
41 	struct qxl_mman *mman;
42 	struct qxl_device *qdev;
43 
44 	mman = container_of(bdev, struct qxl_mman, bdev);
45 	qdev = container_of(mman, struct qxl_device, mman);
46 	return qdev;
47 }
48 
49 static int qxl_ttm_mem_global_init(struct drm_global_reference *ref)
50 {
51 	return ttm_mem_global_init(ref->object);
52 }
53 
54 static void qxl_ttm_mem_global_release(struct drm_global_reference *ref)
55 {
56 	ttm_mem_global_release(ref->object);
57 }
58 
59 static int qxl_ttm_global_init(struct qxl_device *qdev)
60 {
61 	struct drm_global_reference *global_ref;
62 	int r;
63 
64 	qdev->mman.mem_global_referenced = false;
65 	global_ref = &qdev->mman.mem_global_ref;
66 	global_ref->global_type = DRM_GLOBAL_TTM_MEM;
67 	global_ref->size = sizeof(struct ttm_mem_global);
68 	global_ref->init = &qxl_ttm_mem_global_init;
69 	global_ref->release = &qxl_ttm_mem_global_release;
70 
71 	r = drm_global_item_ref(global_ref);
72 	if (r != 0) {
73 		DRM_ERROR("Failed setting up TTM memory accounting "
74 			  "subsystem.\n");
75 		return r;
76 	}
77 
78 	qdev->mman.bo_global_ref.mem_glob =
79 		qdev->mman.mem_global_ref.object;
80 	global_ref = &qdev->mman.bo_global_ref.ref;
81 	global_ref->global_type = DRM_GLOBAL_TTM_BO;
82 	global_ref->size = sizeof(struct ttm_bo_global);
83 	global_ref->init = &ttm_bo_global_init;
84 	global_ref->release = &ttm_bo_global_release;
85 	r = drm_global_item_ref(global_ref);
86 	if (r != 0) {
87 		DRM_ERROR("Failed setting up TTM BO subsystem.\n");
88 		drm_global_item_unref(&qdev->mman.mem_global_ref);
89 		return r;
90 	}
91 
92 	qdev->mman.mem_global_referenced = true;
93 	return 0;
94 }
95 
96 static void qxl_ttm_global_fini(struct qxl_device *qdev)
97 {
98 	if (qdev->mman.mem_global_referenced) {
99 		drm_global_item_unref(&qdev->mman.bo_global_ref.ref);
100 		drm_global_item_unref(&qdev->mman.mem_global_ref);
101 		qdev->mman.mem_global_referenced = false;
102 	}
103 }
104 
105 static struct vm_operations_struct qxl_ttm_vm_ops;
106 static const struct vm_operations_struct *ttm_vm_ops;
107 
108 static int qxl_ttm_fault(struct vm_fault *vmf)
109 {
110 	struct ttm_buffer_object *bo;
111 	int r;
112 
113 	bo = (struct ttm_buffer_object *)vmf->vma->vm_private_data;
114 	if (bo == NULL)
115 		return VM_FAULT_NOPAGE;
116 	r = ttm_vm_ops->fault(vmf);
117 	return r;
118 }
119 
120 int qxl_mmap(struct file *filp, struct vm_area_struct *vma)
121 {
122 	struct drm_file *file_priv;
123 	struct qxl_device *qdev;
124 	int r;
125 
126 	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET)) {
127 		pr_info("%s: vma->vm_pgoff (%ld) < DRM_FILE_PAGE_OFFSET\n",
128 			__func__, vma->vm_pgoff);
129 		return -EINVAL;
130 	}
131 
132 	file_priv = filp->private_data;
133 	qdev = file_priv->minor->dev->dev_private;
134 	if (qdev == NULL) {
135 		DRM_ERROR(
136 		 "filp->private_data->minor->dev->dev_private == NULL\n");
137 		return -EINVAL;
138 	}
139 	QXL_INFO(qdev, "%s: filp->private_data = 0x%p, vma->vm_pgoff = %lx\n",
140 		 __func__, filp->private_data, vma->vm_pgoff);
141 
142 	r = ttm_bo_mmap(filp, vma, &qdev->mman.bdev);
143 	if (unlikely(r != 0))
144 		return r;
145 	if (unlikely(ttm_vm_ops == NULL)) {
146 		ttm_vm_ops = vma->vm_ops;
147 		qxl_ttm_vm_ops = *ttm_vm_ops;
148 		qxl_ttm_vm_ops.fault = &qxl_ttm_fault;
149 	}
150 	vma->vm_ops = &qxl_ttm_vm_ops;
151 	return 0;
152 }
153 
154 static int qxl_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
155 {
156 	return 0;
157 }
158 
159 static int qxl_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
160 			     struct ttm_mem_type_manager *man)
161 {
162 	switch (type) {
163 	case TTM_PL_SYSTEM:
164 		/* System memory */
165 		man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
166 		man->available_caching = TTM_PL_MASK_CACHING;
167 		man->default_caching = TTM_PL_FLAG_CACHED;
168 		break;
169 	case TTM_PL_VRAM:
170 	case TTM_PL_PRIV:
171 		/* "On-card" video ram */
172 		man->func = &ttm_bo_manager_func;
173 		man->gpu_offset = 0;
174 		man->flags = TTM_MEMTYPE_FLAG_FIXED |
175 			     TTM_MEMTYPE_FLAG_MAPPABLE;
176 		man->available_caching = TTM_PL_MASK_CACHING;
177 		man->default_caching = TTM_PL_FLAG_CACHED;
178 		break;
179 	default:
180 		DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
181 		return -EINVAL;
182 	}
183 	return 0;
184 }
185 
186 static void qxl_evict_flags(struct ttm_buffer_object *bo,
187 				struct ttm_placement *placement)
188 {
189 	struct qxl_bo *qbo;
190 	static const struct ttm_place placements = {
191 		.fpfn = 0,
192 		.lpfn = 0,
193 		.flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM
194 	};
195 
196 	if (!qxl_ttm_bo_is_qxl_bo(bo)) {
197 		placement->placement = &placements;
198 		placement->busy_placement = &placements;
199 		placement->num_placement = 1;
200 		placement->num_busy_placement = 1;
201 		return;
202 	}
203 	qbo = to_qxl_bo(bo);
204 	qxl_ttm_placement_from_domain(qbo, QXL_GEM_DOMAIN_CPU, false);
205 	*placement = qbo->placement;
206 }
207 
208 static int qxl_verify_access(struct ttm_buffer_object *bo, struct file *filp)
209 {
210 	struct qxl_bo *qbo = to_qxl_bo(bo);
211 
212 	return drm_vma_node_verify_access(&qbo->gem_base.vma_node,
213 					  filp->private_data);
214 }
215 
216 static int qxl_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
217 				  struct ttm_mem_reg *mem)
218 {
219 	struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
220 	struct qxl_device *qdev = qxl_get_qdev(bdev);
221 
222 	mem->bus.addr = NULL;
223 	mem->bus.offset = 0;
224 	mem->bus.size = mem->num_pages << PAGE_SHIFT;
225 	mem->bus.base = 0;
226 	mem->bus.is_iomem = false;
227 	if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
228 		return -EINVAL;
229 	switch (mem->mem_type) {
230 	case TTM_PL_SYSTEM:
231 		/* system memory */
232 		return 0;
233 	case TTM_PL_VRAM:
234 		mem->bus.is_iomem = true;
235 		mem->bus.base = qdev->vram_base;
236 		mem->bus.offset = mem->start << PAGE_SHIFT;
237 		break;
238 	case TTM_PL_PRIV:
239 		mem->bus.is_iomem = true;
240 		mem->bus.base = qdev->surfaceram_base;
241 		mem->bus.offset = mem->start << PAGE_SHIFT;
242 		break;
243 	default:
244 		return -EINVAL;
245 	}
246 	return 0;
247 }
248 
249 static void qxl_ttm_io_mem_free(struct ttm_bo_device *bdev,
250 				struct ttm_mem_reg *mem)
251 {
252 }
253 
254 /*
255  * TTM backend functions.
256  */
257 struct qxl_ttm_tt {
258 	struct ttm_dma_tt		ttm;
259 	struct qxl_device		*qdev;
260 	u64				offset;
261 };
262 
263 static int qxl_ttm_backend_bind(struct ttm_tt *ttm,
264 				struct ttm_mem_reg *bo_mem)
265 {
266 	struct qxl_ttm_tt *gtt = (void *)ttm;
267 
268 	gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
269 	if (!ttm->num_pages) {
270 		WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
271 		     ttm->num_pages, bo_mem, ttm);
272 	}
273 	/* Not implemented */
274 	return -1;
275 }
276 
277 static int qxl_ttm_backend_unbind(struct ttm_tt *ttm)
278 {
279 	/* Not implemented */
280 	return -1;
281 }
282 
283 static void qxl_ttm_backend_destroy(struct ttm_tt *ttm)
284 {
285 	struct qxl_ttm_tt *gtt = (void *)ttm;
286 
287 	ttm_dma_tt_fini(&gtt->ttm);
288 	kfree(gtt);
289 }
290 
291 static struct ttm_backend_func qxl_backend_func = {
292 	.bind = &qxl_ttm_backend_bind,
293 	.unbind = &qxl_ttm_backend_unbind,
294 	.destroy = &qxl_ttm_backend_destroy,
295 };
296 
297 static int qxl_ttm_tt_populate(struct ttm_tt *ttm)
298 {
299 	int r;
300 
301 	if (ttm->state != tt_unpopulated)
302 		return 0;
303 
304 	r = ttm_pool_populate(ttm);
305 	if (r)
306 		return r;
307 
308 	return 0;
309 }
310 
311 static void qxl_ttm_tt_unpopulate(struct ttm_tt *ttm)
312 {
313 	ttm_pool_unpopulate(ttm);
314 }
315 
316 static struct ttm_tt *qxl_ttm_tt_create(struct ttm_bo_device *bdev,
317 					unsigned long size, uint32_t page_flags,
318 					struct page *dummy_read_page)
319 {
320 	struct qxl_device *qdev;
321 	struct qxl_ttm_tt *gtt;
322 
323 	qdev = qxl_get_qdev(bdev);
324 	gtt = kzalloc(sizeof(struct qxl_ttm_tt), GFP_KERNEL);
325 	if (gtt == NULL)
326 		return NULL;
327 	gtt->ttm.ttm.func = &qxl_backend_func;
328 	gtt->qdev = qdev;
329 	if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags,
330 			    dummy_read_page)) {
331 		kfree(gtt);
332 		return NULL;
333 	}
334 	return &gtt->ttm.ttm;
335 }
336 
337 static void qxl_move_null(struct ttm_buffer_object *bo,
338 			     struct ttm_mem_reg *new_mem)
339 {
340 	struct ttm_mem_reg *old_mem = &bo->mem;
341 
342 	BUG_ON(old_mem->mm_node != NULL);
343 	*old_mem = *new_mem;
344 	new_mem->mm_node = NULL;
345 }
346 
347 static int qxl_bo_move(struct ttm_buffer_object *bo,
348 		       bool evict, bool interruptible,
349 		       bool no_wait_gpu,
350 		       struct ttm_mem_reg *new_mem)
351 {
352 	struct ttm_mem_reg *old_mem = &bo->mem;
353 	int ret;
354 
355 	ret = ttm_bo_wait(bo, interruptible, no_wait_gpu);
356 	if (ret)
357 		return ret;
358 
359 
360 	if (old_mem->mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
361 		qxl_move_null(bo, new_mem);
362 		return 0;
363 	}
364 	return ttm_bo_move_memcpy(bo, interruptible, no_wait_gpu,
365 				  new_mem);
366 }
367 
368 static void qxl_bo_move_notify(struct ttm_buffer_object *bo,
369 			       bool evict,
370 			       struct ttm_mem_reg *new_mem)
371 {
372 	struct qxl_bo *qbo;
373 	struct qxl_device *qdev;
374 
375 	if (!qxl_ttm_bo_is_qxl_bo(bo))
376 		return;
377 	qbo = to_qxl_bo(bo);
378 	qdev = qbo->gem_base.dev->dev_private;
379 
380 	if (bo->mem.mem_type == TTM_PL_PRIV && qbo->surface_id)
381 		qxl_surface_evict(qdev, qbo, new_mem ? true : false);
382 }
383 
384 static struct ttm_bo_driver qxl_bo_driver = {
385 	.ttm_tt_create = &qxl_ttm_tt_create,
386 	.ttm_tt_populate = &qxl_ttm_tt_populate,
387 	.ttm_tt_unpopulate = &qxl_ttm_tt_unpopulate,
388 	.invalidate_caches = &qxl_invalidate_caches,
389 	.init_mem_type = &qxl_init_mem_type,
390 	.eviction_valuable = ttm_bo_eviction_valuable,
391 	.evict_flags = &qxl_evict_flags,
392 	.move = &qxl_bo_move,
393 	.verify_access = &qxl_verify_access,
394 	.io_mem_reserve = &qxl_ttm_io_mem_reserve,
395 	.io_mem_free = &qxl_ttm_io_mem_free,
396 	.io_mem_pfn = ttm_bo_default_io_mem_pfn,
397 	.move_notify = &qxl_bo_move_notify,
398 };
399 
400 int qxl_ttm_init(struct qxl_device *qdev)
401 {
402 	int r;
403 	int num_io_pages; /* != rom->num_io_pages, we include surface0 */
404 
405 	r = qxl_ttm_global_init(qdev);
406 	if (r)
407 		return r;
408 	/* No others user of address space so set it to 0 */
409 	r = ttm_bo_device_init(&qdev->mman.bdev,
410 			       qdev->mman.bo_global_ref.ref.object,
411 			       &qxl_bo_driver,
412 			       qdev->ddev.anon_inode->i_mapping,
413 			       DRM_FILE_PAGE_OFFSET, 0);
414 	if (r) {
415 		DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
416 		return r;
417 	}
418 	/* NOTE: this includes the framebuffer (aka surface 0) */
419 	num_io_pages = qdev->rom->ram_header_offset / PAGE_SIZE;
420 	r = ttm_bo_init_mm(&qdev->mman.bdev, TTM_PL_VRAM,
421 			   num_io_pages);
422 	if (r) {
423 		DRM_ERROR("Failed initializing VRAM heap.\n");
424 		return r;
425 	}
426 	r = ttm_bo_init_mm(&qdev->mman.bdev, TTM_PL_PRIV,
427 			   qdev->surfaceram_size / PAGE_SIZE);
428 	if (r) {
429 		DRM_ERROR("Failed initializing Surfaces heap.\n");
430 		return r;
431 	}
432 	DRM_INFO("qxl: %uM of VRAM memory size\n",
433 		 (unsigned)qdev->vram_size / (1024 * 1024));
434 	DRM_INFO("qxl: %luM of IO pages memory ready (VRAM domain)\n",
435 		 ((unsigned)num_io_pages * PAGE_SIZE) / (1024 * 1024));
436 	DRM_INFO("qxl: %uM of Surface memory size\n",
437 		 (unsigned)qdev->surfaceram_size / (1024 * 1024));
438 	return 0;
439 }
440 
441 void qxl_ttm_fini(struct qxl_device *qdev)
442 {
443 	ttm_bo_clean_mm(&qdev->mman.bdev, TTM_PL_VRAM);
444 	ttm_bo_clean_mm(&qdev->mman.bdev, TTM_PL_PRIV);
445 	ttm_bo_device_release(&qdev->mman.bdev);
446 	qxl_ttm_global_fini(qdev);
447 	DRM_INFO("qxl: ttm finalized\n");
448 }
449 
450 
451 #define QXL_DEBUGFS_MEM_TYPES 2
452 
453 #if defined(CONFIG_DEBUG_FS)
454 static int qxl_mm_dump_table(struct seq_file *m, void *data)
455 {
456 	struct drm_info_node *node = (struct drm_info_node *)m->private;
457 	struct drm_mm *mm = (struct drm_mm *)node->info_ent->data;
458 	struct drm_device *dev = node->minor->dev;
459 	struct qxl_device *rdev = dev->dev_private;
460 	struct ttm_bo_global *glob = rdev->mman.bdev.glob;
461 	struct drm_printer p = drm_seq_file_printer(m);
462 
463 	spin_lock(&glob->lru_lock);
464 	drm_mm_print(mm, &p);
465 	spin_unlock(&glob->lru_lock);
466 	return 0;
467 }
468 #endif
469 
470 int qxl_ttm_debugfs_init(struct qxl_device *qdev)
471 {
472 #if defined(CONFIG_DEBUG_FS)
473 	static struct drm_info_list qxl_mem_types_list[QXL_DEBUGFS_MEM_TYPES];
474 	static char qxl_mem_types_names[QXL_DEBUGFS_MEM_TYPES][32];
475 	unsigned i;
476 
477 	for (i = 0; i < QXL_DEBUGFS_MEM_TYPES; i++) {
478 		if (i == 0)
479 			sprintf(qxl_mem_types_names[i], "qxl_mem_mm");
480 		else
481 			sprintf(qxl_mem_types_names[i], "qxl_surf_mm");
482 		qxl_mem_types_list[i].name = qxl_mem_types_names[i];
483 		qxl_mem_types_list[i].show = &qxl_mm_dump_table;
484 		qxl_mem_types_list[i].driver_features = 0;
485 		if (i == 0)
486 			qxl_mem_types_list[i].data = qdev->mman.bdev.man[TTM_PL_VRAM].priv;
487 		else
488 			qxl_mem_types_list[i].data = qdev->mman.bdev.man[TTM_PL_PRIV].priv;
489 
490 	}
491 	return qxl_debugfs_add_files(qdev, qxl_mem_types_list, i);
492 #else
493 	return 0;
494 #endif
495 }
496