1 /*
2  * Copyright 2008 Advanced Micro Devices, Inc.
3  * Copyright 2008 Red Hat Inc.
4  * Copyright 2009 Jerome Glisse.
5  *
6  * Permission is hereby granted, free of charge, to any person obtaining a
7  * copy of this software and associated documentation files (the "Software"),
8  * to deal in the Software without restriction, including without limitation
9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10  * and/or sell copies of the Software, and to permit persons to whom the
11  * Software is furnished to do so, subject to the following conditions:
12  *
13  * The above copyright notice and this permission notice shall be included in
14  * all copies or substantial portions of the Software.
15  *
16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22  * OTHER DEALINGS IN THE SOFTWARE.
23  *
24  * Authors: Dave Airlie
25  *          Alex Deucher
26  *          Jerome Glisse
27  */
28 #include <linux/ktime.h>
29 #include <linux/module.h>
30 #include <linux/pagemap.h>
31 #include <linux/pci.h>
32 #include <linux/dma-buf.h>
33 
34 #include <drm/amdgpu_drm.h>
35 #include <drm/drm_drv.h>
36 #include <drm/drm_gem_ttm_helper.h>
37 
38 #include "amdgpu.h"
39 #include "amdgpu_display.h"
40 #include "amdgpu_dma_buf.h"
41 #include "amdgpu_xgmi.h"
42 
43 static const struct drm_gem_object_funcs amdgpu_gem_object_funcs;
44 
45 static vm_fault_t amdgpu_gem_fault(struct vm_fault *vmf)
46 {
47 	struct ttm_buffer_object *bo = vmf->vma->vm_private_data;
48 	struct drm_device *ddev = bo->base.dev;
49 	vm_fault_t ret;
50 	int idx;
51 
52 	ret = ttm_bo_vm_reserve(bo, vmf);
53 	if (ret)
54 		return ret;
55 
56 	if (drm_dev_enter(ddev, &idx)) {
57 		ret = amdgpu_bo_fault_reserve_notify(bo);
58 		if (ret) {
59 			drm_dev_exit(idx);
60 			goto unlock;
61 		}
62 
63 		 ret = ttm_bo_vm_fault_reserved(vmf, vmf->vma->vm_page_prot,
64 						TTM_BO_VM_NUM_PREFAULT, 1);
65 
66 		 drm_dev_exit(idx);
67 	} else {
68 		ret = ttm_bo_vm_dummy_page(vmf, vmf->vma->vm_page_prot);
69 	}
70 	if (ret == VM_FAULT_RETRY && !(vmf->flags & FAULT_FLAG_RETRY_NOWAIT))
71 		return ret;
72 
73 unlock:
74 	dma_resv_unlock(bo->base.resv);
75 	return ret;
76 }
77 
78 static const struct vm_operations_struct amdgpu_gem_vm_ops = {
79 	.fault = amdgpu_gem_fault,
80 	.open = ttm_bo_vm_open,
81 	.close = ttm_bo_vm_close,
82 	.access = ttm_bo_vm_access
83 };
84 
85 static void amdgpu_gem_object_free(struct drm_gem_object *gobj)
86 {
87 	struct amdgpu_bo *robj = gem_to_amdgpu_bo(gobj);
88 
89 	if (robj) {
90 		amdgpu_mn_unregister(robj);
91 		amdgpu_bo_unref(&robj);
92 	}
93 }
94 
95 int amdgpu_gem_object_create(struct amdgpu_device *adev, unsigned long size,
96 			     int alignment, u32 initial_domain,
97 			     u64 flags, enum ttm_bo_type type,
98 			     struct dma_resv *resv,
99 			     struct drm_gem_object **obj)
100 {
101 	struct amdgpu_bo *bo;
102 	struct amdgpu_bo_user *ubo;
103 	struct amdgpu_bo_param bp;
104 	int r;
105 
106 	memset(&bp, 0, sizeof(bp));
107 	*obj = NULL;
108 
109 	bp.size = size;
110 	bp.byte_align = alignment;
111 	bp.type = type;
112 	bp.resv = resv;
113 	bp.preferred_domain = initial_domain;
114 	bp.flags = flags;
115 	bp.domain = initial_domain;
116 	bp.bo_ptr_size = sizeof(struct amdgpu_bo);
117 
118 	r = amdgpu_bo_create_user(adev, &bp, &ubo);
119 	if (r)
120 		return r;
121 
122 	bo = &ubo->bo;
123 	*obj = &bo->tbo.base;
124 	(*obj)->funcs = &amdgpu_gem_object_funcs;
125 
126 	return 0;
127 }
128 
129 void amdgpu_gem_force_release(struct amdgpu_device *adev)
130 {
131 	struct drm_device *ddev = adev_to_drm(adev);
132 	struct drm_file *file;
133 
134 	mutex_lock(&ddev->filelist_mutex);
135 
136 	list_for_each_entry(file, &ddev->filelist, lhead) {
137 		struct drm_gem_object *gobj;
138 		int handle;
139 
140 		WARN_ONCE(1, "Still active user space clients!\n");
141 		spin_lock(&file->table_lock);
142 		idr_for_each_entry(&file->object_idr, gobj, handle) {
143 			WARN_ONCE(1, "And also active allocations!\n");
144 			drm_gem_object_put(gobj);
145 		}
146 		idr_destroy(&file->object_idr);
147 		spin_unlock(&file->table_lock);
148 	}
149 
150 	mutex_unlock(&ddev->filelist_mutex);
151 }
152 
153 /*
154  * Call from drm_gem_handle_create which appear in both new and open ioctl
155  * case.
156  */
157 static int amdgpu_gem_object_open(struct drm_gem_object *obj,
158 				  struct drm_file *file_priv)
159 {
160 	struct amdgpu_bo *abo = gem_to_amdgpu_bo(obj);
161 	struct amdgpu_device *adev = amdgpu_ttm_adev(abo->tbo.bdev);
162 	struct amdgpu_fpriv *fpriv = file_priv->driver_priv;
163 	struct amdgpu_vm *vm = &fpriv->vm;
164 	struct amdgpu_bo_va *bo_va;
165 	struct mm_struct *mm;
166 	int r;
167 
168 	mm = amdgpu_ttm_tt_get_usermm(abo->tbo.ttm);
169 	if (mm && mm != current->mm)
170 		return -EPERM;
171 
172 	if (abo->flags & AMDGPU_GEM_CREATE_VM_ALWAYS_VALID &&
173 	    abo->tbo.base.resv != vm->root.bo->tbo.base.resv)
174 		return -EPERM;
175 
176 	r = amdgpu_bo_reserve(abo, false);
177 	if (r)
178 		return r;
179 
180 	bo_va = amdgpu_vm_bo_find(vm, abo);
181 	if (!bo_va) {
182 		bo_va = amdgpu_vm_bo_add(adev, vm, abo);
183 	} else {
184 		++bo_va->ref_count;
185 	}
186 	amdgpu_bo_unreserve(abo);
187 	return 0;
188 }
189 
190 static void amdgpu_gem_object_close(struct drm_gem_object *obj,
191 				    struct drm_file *file_priv)
192 {
193 	struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
194 	struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
195 	struct amdgpu_fpriv *fpriv = file_priv->driver_priv;
196 	struct amdgpu_vm *vm = &fpriv->vm;
197 
198 	struct amdgpu_bo_list_entry vm_pd;
199 	struct list_head list, duplicates;
200 	struct dma_fence *fence = NULL;
201 	struct ttm_validate_buffer tv;
202 	struct ww_acquire_ctx ticket;
203 	struct amdgpu_bo_va *bo_va;
204 	long r;
205 
206 	INIT_LIST_HEAD(&list);
207 	INIT_LIST_HEAD(&duplicates);
208 
209 	tv.bo = &bo->tbo;
210 	tv.num_shared = 2;
211 	list_add(&tv.head, &list);
212 
213 	amdgpu_vm_get_pd_bo(vm, &list, &vm_pd);
214 
215 	r = ttm_eu_reserve_buffers(&ticket, &list, false, &duplicates);
216 	if (r) {
217 		dev_err(adev->dev, "leaking bo va because "
218 			"we fail to reserve bo (%ld)\n", r);
219 		return;
220 	}
221 	bo_va = amdgpu_vm_bo_find(vm, bo);
222 	if (!bo_va || --bo_va->ref_count)
223 		goto out_unlock;
224 
225 	amdgpu_vm_bo_rmv(adev, bo_va);
226 	if (!amdgpu_vm_ready(vm))
227 		goto out_unlock;
228 
229 	fence = dma_resv_excl_fence(bo->tbo.base.resv);
230 	if (fence) {
231 		amdgpu_bo_fence(bo, fence, true);
232 		fence = NULL;
233 	}
234 
235 	r = amdgpu_vm_clear_freed(adev, vm, &fence);
236 	if (r || !fence)
237 		goto out_unlock;
238 
239 	amdgpu_bo_fence(bo, fence, true);
240 	dma_fence_put(fence);
241 
242 out_unlock:
243 	if (unlikely(r < 0))
244 		dev_err(adev->dev, "failed to clear page "
245 			"tables on GEM object close (%ld)\n", r);
246 	ttm_eu_backoff_reservation(&ticket, &list);
247 }
248 
249 static int amdgpu_gem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
250 {
251 	struct amdgpu_bo *bo = gem_to_amdgpu_bo(obj);
252 
253 	if (amdgpu_ttm_tt_get_usermm(bo->tbo.ttm))
254 		return -EPERM;
255 	if (bo->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS)
256 		return -EPERM;
257 
258 	/* Workaround for Thunk bug creating PROT_NONE,MAP_PRIVATE mappings
259 	 * for debugger access to invisible VRAM. Should have used MAP_SHARED
260 	 * instead. Clearing VM_MAYWRITE prevents the mapping from ever
261 	 * becoming writable and makes is_cow_mapping(vm_flags) false.
262 	 */
263 	if (is_cow_mapping(vma->vm_flags) &&
264 	    !(vma->vm_flags & (VM_READ | VM_WRITE | VM_EXEC)))
265 		vma->vm_flags &= ~VM_MAYWRITE;
266 
267 	return drm_gem_ttm_mmap(obj, vma);
268 }
269 
270 static const struct drm_gem_object_funcs amdgpu_gem_object_funcs = {
271 	.free = amdgpu_gem_object_free,
272 	.open = amdgpu_gem_object_open,
273 	.close = amdgpu_gem_object_close,
274 	.export = amdgpu_gem_prime_export,
275 	.vmap = drm_gem_ttm_vmap,
276 	.vunmap = drm_gem_ttm_vunmap,
277 	.mmap = amdgpu_gem_object_mmap,
278 	.vm_ops = &amdgpu_gem_vm_ops,
279 };
280 
281 /*
282  * GEM ioctls.
283  */
284 int amdgpu_gem_create_ioctl(struct drm_device *dev, void *data,
285 			    struct drm_file *filp)
286 {
287 	struct amdgpu_device *adev = drm_to_adev(dev);
288 	struct amdgpu_fpriv *fpriv = filp->driver_priv;
289 	struct amdgpu_vm *vm = &fpriv->vm;
290 	union drm_amdgpu_gem_create *args = data;
291 	uint64_t flags = args->in.domain_flags;
292 	uint64_t size = args->in.bo_size;
293 	struct dma_resv *resv = NULL;
294 	struct drm_gem_object *gobj;
295 	uint32_t handle, initial_domain;
296 	int r;
297 
298 	/* reject invalid gem flags */
299 	if (flags & ~(AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
300 		      AMDGPU_GEM_CREATE_NO_CPU_ACCESS |
301 		      AMDGPU_GEM_CREATE_CPU_GTT_USWC |
302 		      AMDGPU_GEM_CREATE_VRAM_CLEARED |
303 		      AMDGPU_GEM_CREATE_VM_ALWAYS_VALID |
304 		      AMDGPU_GEM_CREATE_EXPLICIT_SYNC |
305 		      AMDGPU_GEM_CREATE_ENCRYPTED))
306 
307 		return -EINVAL;
308 
309 	/* reject invalid gem domains */
310 	if (args->in.domains & ~AMDGPU_GEM_DOMAIN_MASK)
311 		return -EINVAL;
312 
313 	if (!amdgpu_is_tmz(adev) && (flags & AMDGPU_GEM_CREATE_ENCRYPTED)) {
314 		DRM_NOTE_ONCE("Cannot allocate secure buffer since TMZ is disabled\n");
315 		return -EINVAL;
316 	}
317 
318 	/* create a gem object to contain this object in */
319 	if (args->in.domains & (AMDGPU_GEM_DOMAIN_GDS |
320 	    AMDGPU_GEM_DOMAIN_GWS | AMDGPU_GEM_DOMAIN_OA)) {
321 		if (flags & AMDGPU_GEM_CREATE_VM_ALWAYS_VALID) {
322 			/* if gds bo is created from user space, it must be
323 			 * passed to bo list
324 			 */
325 			DRM_ERROR("GDS bo cannot be per-vm-bo\n");
326 			return -EINVAL;
327 		}
328 		flags |= AMDGPU_GEM_CREATE_NO_CPU_ACCESS;
329 	}
330 
331 	if (flags & AMDGPU_GEM_CREATE_VM_ALWAYS_VALID) {
332 		r = amdgpu_bo_reserve(vm->root.bo, false);
333 		if (r)
334 			return r;
335 
336 		resv = vm->root.bo->tbo.base.resv;
337 	}
338 
339 	initial_domain = (u32)(0xffffffff & args->in.domains);
340 retry:
341 	r = amdgpu_gem_object_create(adev, size, args->in.alignment,
342 				     initial_domain,
343 				     flags, ttm_bo_type_device, resv, &gobj);
344 	if (r && r != -ERESTARTSYS) {
345 		if (flags & AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED) {
346 			flags &= ~AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
347 			goto retry;
348 		}
349 
350 		if (initial_domain == AMDGPU_GEM_DOMAIN_VRAM) {
351 			initial_domain |= AMDGPU_GEM_DOMAIN_GTT;
352 			goto retry;
353 		}
354 		DRM_DEBUG("Failed to allocate GEM object (%llu, %d, %llu, %d)\n",
355 				size, initial_domain, args->in.alignment, r);
356 	}
357 
358 	if (flags & AMDGPU_GEM_CREATE_VM_ALWAYS_VALID) {
359 		if (!r) {
360 			struct amdgpu_bo *abo = gem_to_amdgpu_bo(gobj);
361 
362 			abo->parent = amdgpu_bo_ref(vm->root.bo);
363 		}
364 		amdgpu_bo_unreserve(vm->root.bo);
365 	}
366 	if (r)
367 		return r;
368 
369 	r = drm_gem_handle_create(filp, gobj, &handle);
370 	/* drop reference from allocate - handle holds it now */
371 	drm_gem_object_put(gobj);
372 	if (r)
373 		return r;
374 
375 	memset(args, 0, sizeof(*args));
376 	args->out.handle = handle;
377 	return 0;
378 }
379 
380 int amdgpu_gem_userptr_ioctl(struct drm_device *dev, void *data,
381 			     struct drm_file *filp)
382 {
383 	struct ttm_operation_ctx ctx = { true, false };
384 	struct amdgpu_device *adev = drm_to_adev(dev);
385 	struct drm_amdgpu_gem_userptr *args = data;
386 	struct drm_gem_object *gobj;
387 	struct amdgpu_bo *bo;
388 	uint32_t handle;
389 	int r;
390 
391 	args->addr = untagged_addr(args->addr);
392 
393 	if (offset_in_page(args->addr | args->size))
394 		return -EINVAL;
395 
396 	/* reject unknown flag values */
397 	if (args->flags & ~(AMDGPU_GEM_USERPTR_READONLY |
398 	    AMDGPU_GEM_USERPTR_ANONONLY | AMDGPU_GEM_USERPTR_VALIDATE |
399 	    AMDGPU_GEM_USERPTR_REGISTER))
400 		return -EINVAL;
401 
402 	if (!(args->flags & AMDGPU_GEM_USERPTR_READONLY) &&
403 	     !(args->flags & AMDGPU_GEM_USERPTR_REGISTER)) {
404 
405 		/* if we want to write to it we must install a MMU notifier */
406 		return -EACCES;
407 	}
408 
409 	/* create a gem object to contain this object in */
410 	r = amdgpu_gem_object_create(adev, args->size, 0, AMDGPU_GEM_DOMAIN_CPU,
411 				     0, ttm_bo_type_device, NULL, &gobj);
412 	if (r)
413 		return r;
414 
415 	bo = gem_to_amdgpu_bo(gobj);
416 	bo->preferred_domains = AMDGPU_GEM_DOMAIN_GTT;
417 	bo->allowed_domains = AMDGPU_GEM_DOMAIN_GTT;
418 	r = amdgpu_ttm_tt_set_userptr(&bo->tbo, args->addr, args->flags);
419 	if (r)
420 		goto release_object;
421 
422 	if (args->flags & AMDGPU_GEM_USERPTR_REGISTER) {
423 		r = amdgpu_mn_register(bo, args->addr);
424 		if (r)
425 			goto release_object;
426 	}
427 
428 	if (args->flags & AMDGPU_GEM_USERPTR_VALIDATE) {
429 		r = amdgpu_ttm_tt_get_user_pages(bo, bo->tbo.ttm->pages);
430 		if (r)
431 			goto release_object;
432 
433 		r = amdgpu_bo_reserve(bo, true);
434 		if (r)
435 			goto user_pages_done;
436 
437 		amdgpu_bo_placement_from_domain(bo, AMDGPU_GEM_DOMAIN_GTT);
438 		r = ttm_bo_validate(&bo->tbo, &bo->placement, &ctx);
439 		amdgpu_bo_unreserve(bo);
440 		if (r)
441 			goto user_pages_done;
442 	}
443 
444 	r = drm_gem_handle_create(filp, gobj, &handle);
445 	if (r)
446 		goto user_pages_done;
447 
448 	args->handle = handle;
449 
450 user_pages_done:
451 	if (args->flags & AMDGPU_GEM_USERPTR_VALIDATE)
452 		amdgpu_ttm_tt_get_user_pages_done(bo->tbo.ttm);
453 
454 release_object:
455 	drm_gem_object_put(gobj);
456 
457 	return r;
458 }
459 
460 int amdgpu_mode_dumb_mmap(struct drm_file *filp,
461 			  struct drm_device *dev,
462 			  uint32_t handle, uint64_t *offset_p)
463 {
464 	struct drm_gem_object *gobj;
465 	struct amdgpu_bo *robj;
466 
467 	gobj = drm_gem_object_lookup(filp, handle);
468 	if (gobj == NULL) {
469 		return -ENOENT;
470 	}
471 	robj = gem_to_amdgpu_bo(gobj);
472 	if (amdgpu_ttm_tt_get_usermm(robj->tbo.ttm) ||
473 	    (robj->flags & AMDGPU_GEM_CREATE_NO_CPU_ACCESS)) {
474 		drm_gem_object_put(gobj);
475 		return -EPERM;
476 	}
477 	*offset_p = amdgpu_bo_mmap_offset(robj);
478 	drm_gem_object_put(gobj);
479 	return 0;
480 }
481 
482 int amdgpu_gem_mmap_ioctl(struct drm_device *dev, void *data,
483 			  struct drm_file *filp)
484 {
485 	union drm_amdgpu_gem_mmap *args = data;
486 	uint32_t handle = args->in.handle;
487 	memset(args, 0, sizeof(*args));
488 	return amdgpu_mode_dumb_mmap(filp, dev, handle, &args->out.addr_ptr);
489 }
490 
491 /**
492  * amdgpu_gem_timeout - calculate jiffies timeout from absolute value
493  *
494  * @timeout_ns: timeout in ns
495  *
496  * Calculate the timeout in jiffies from an absolute timeout in ns.
497  */
498 unsigned long amdgpu_gem_timeout(uint64_t timeout_ns)
499 {
500 	unsigned long timeout_jiffies;
501 	ktime_t timeout;
502 
503 	/* clamp timeout if it's to large */
504 	if (((int64_t)timeout_ns) < 0)
505 		return MAX_SCHEDULE_TIMEOUT;
506 
507 	timeout = ktime_sub(ns_to_ktime(timeout_ns), ktime_get());
508 	if (ktime_to_ns(timeout) < 0)
509 		return 0;
510 
511 	timeout_jiffies = nsecs_to_jiffies(ktime_to_ns(timeout));
512 	/*  clamp timeout to avoid unsigned-> signed overflow */
513 	if (timeout_jiffies > MAX_SCHEDULE_TIMEOUT )
514 		return MAX_SCHEDULE_TIMEOUT - 1;
515 
516 	return timeout_jiffies;
517 }
518 
519 int amdgpu_gem_wait_idle_ioctl(struct drm_device *dev, void *data,
520 			      struct drm_file *filp)
521 {
522 	union drm_amdgpu_gem_wait_idle *args = data;
523 	struct drm_gem_object *gobj;
524 	struct amdgpu_bo *robj;
525 	uint32_t handle = args->in.handle;
526 	unsigned long timeout = amdgpu_gem_timeout(args->in.timeout);
527 	int r = 0;
528 	long ret;
529 
530 	gobj = drm_gem_object_lookup(filp, handle);
531 	if (gobj == NULL) {
532 		return -ENOENT;
533 	}
534 	robj = gem_to_amdgpu_bo(gobj);
535 	ret = dma_resv_wait_timeout(robj->tbo.base.resv, true, true, timeout);
536 
537 	/* ret == 0 means not signaled,
538 	 * ret > 0 means signaled
539 	 * ret < 0 means interrupted before timeout
540 	 */
541 	if (ret >= 0) {
542 		memset(args, 0, sizeof(*args));
543 		args->out.status = (ret == 0);
544 	} else
545 		r = ret;
546 
547 	drm_gem_object_put(gobj);
548 	return r;
549 }
550 
551 int amdgpu_gem_metadata_ioctl(struct drm_device *dev, void *data,
552 				struct drm_file *filp)
553 {
554 	struct drm_amdgpu_gem_metadata *args = data;
555 	struct drm_gem_object *gobj;
556 	struct amdgpu_bo *robj;
557 	int r = -1;
558 
559 	DRM_DEBUG("%d \n", args->handle);
560 	gobj = drm_gem_object_lookup(filp, args->handle);
561 	if (gobj == NULL)
562 		return -ENOENT;
563 	robj = gem_to_amdgpu_bo(gobj);
564 
565 	r = amdgpu_bo_reserve(robj, false);
566 	if (unlikely(r != 0))
567 		goto out;
568 
569 	if (args->op == AMDGPU_GEM_METADATA_OP_GET_METADATA) {
570 		amdgpu_bo_get_tiling_flags(robj, &args->data.tiling_info);
571 		r = amdgpu_bo_get_metadata(robj, args->data.data,
572 					   sizeof(args->data.data),
573 					   &args->data.data_size_bytes,
574 					   &args->data.flags);
575 	} else if (args->op == AMDGPU_GEM_METADATA_OP_SET_METADATA) {
576 		if (args->data.data_size_bytes > sizeof(args->data.data)) {
577 			r = -EINVAL;
578 			goto unreserve;
579 		}
580 		r = amdgpu_bo_set_tiling_flags(robj, args->data.tiling_info);
581 		if (!r)
582 			r = amdgpu_bo_set_metadata(robj, args->data.data,
583 						   args->data.data_size_bytes,
584 						   args->data.flags);
585 	}
586 
587 unreserve:
588 	amdgpu_bo_unreserve(robj);
589 out:
590 	drm_gem_object_put(gobj);
591 	return r;
592 }
593 
594 /**
595  * amdgpu_gem_va_update_vm -update the bo_va in its VM
596  *
597  * @adev: amdgpu_device pointer
598  * @vm: vm to update
599  * @bo_va: bo_va to update
600  * @operation: map, unmap or clear
601  *
602  * Update the bo_va directly after setting its address. Errors are not
603  * vital here, so they are not reported back to userspace.
604  */
605 static void amdgpu_gem_va_update_vm(struct amdgpu_device *adev,
606 				    struct amdgpu_vm *vm,
607 				    struct amdgpu_bo_va *bo_va,
608 				    uint32_t operation)
609 {
610 	int r;
611 
612 	if (!amdgpu_vm_ready(vm))
613 		return;
614 
615 	r = amdgpu_vm_clear_freed(adev, vm, NULL);
616 	if (r)
617 		goto error;
618 
619 	if (operation == AMDGPU_VA_OP_MAP ||
620 	    operation == AMDGPU_VA_OP_REPLACE) {
621 		r = amdgpu_vm_bo_update(adev, bo_va, false, NULL);
622 		if (r)
623 			goto error;
624 	}
625 
626 	r = amdgpu_vm_update_pdes(adev, vm, false);
627 
628 error:
629 	if (r && r != -ERESTARTSYS)
630 		DRM_ERROR("Couldn't update BO_VA (%d)\n", r);
631 }
632 
633 /**
634  * amdgpu_gem_va_map_flags - map GEM UAPI flags into hardware flags
635  *
636  * @adev: amdgpu_device pointer
637  * @flags: GEM UAPI flags
638  *
639  * Returns the GEM UAPI flags mapped into hardware for the ASIC.
640  */
641 uint64_t amdgpu_gem_va_map_flags(struct amdgpu_device *adev, uint32_t flags)
642 {
643 	uint64_t pte_flag = 0;
644 
645 	if (flags & AMDGPU_VM_PAGE_EXECUTABLE)
646 		pte_flag |= AMDGPU_PTE_EXECUTABLE;
647 	if (flags & AMDGPU_VM_PAGE_READABLE)
648 		pte_flag |= AMDGPU_PTE_READABLE;
649 	if (flags & AMDGPU_VM_PAGE_WRITEABLE)
650 		pte_flag |= AMDGPU_PTE_WRITEABLE;
651 	if (flags & AMDGPU_VM_PAGE_PRT)
652 		pte_flag |= AMDGPU_PTE_PRT;
653 
654 	if (adev->gmc.gmc_funcs->map_mtype)
655 		pte_flag |= amdgpu_gmc_map_mtype(adev,
656 						 flags & AMDGPU_VM_MTYPE_MASK);
657 
658 	return pte_flag;
659 }
660 
661 int amdgpu_gem_va_ioctl(struct drm_device *dev, void *data,
662 			  struct drm_file *filp)
663 {
664 	const uint32_t valid_flags = AMDGPU_VM_DELAY_UPDATE |
665 		AMDGPU_VM_PAGE_READABLE | AMDGPU_VM_PAGE_WRITEABLE |
666 		AMDGPU_VM_PAGE_EXECUTABLE | AMDGPU_VM_MTYPE_MASK;
667 	const uint32_t prt_flags = AMDGPU_VM_DELAY_UPDATE |
668 		AMDGPU_VM_PAGE_PRT;
669 
670 	struct drm_amdgpu_gem_va *args = data;
671 	struct drm_gem_object *gobj;
672 	struct amdgpu_device *adev = drm_to_adev(dev);
673 	struct amdgpu_fpriv *fpriv = filp->driver_priv;
674 	struct amdgpu_bo *abo;
675 	struct amdgpu_bo_va *bo_va;
676 	struct amdgpu_bo_list_entry vm_pd;
677 	struct ttm_validate_buffer tv;
678 	struct ww_acquire_ctx ticket;
679 	struct list_head list, duplicates;
680 	uint64_t va_flags;
681 	uint64_t vm_size;
682 	int r = 0;
683 
684 	if (args->va_address < AMDGPU_VA_RESERVED_SIZE) {
685 		dev_dbg(dev->dev,
686 			"va_address 0x%LX is in reserved area 0x%LX\n",
687 			args->va_address, AMDGPU_VA_RESERVED_SIZE);
688 		return -EINVAL;
689 	}
690 
691 	if (args->va_address >= AMDGPU_GMC_HOLE_START &&
692 	    args->va_address < AMDGPU_GMC_HOLE_END) {
693 		dev_dbg(dev->dev,
694 			"va_address 0x%LX is in VA hole 0x%LX-0x%LX\n",
695 			args->va_address, AMDGPU_GMC_HOLE_START,
696 			AMDGPU_GMC_HOLE_END);
697 		return -EINVAL;
698 	}
699 
700 	args->va_address &= AMDGPU_GMC_HOLE_MASK;
701 
702 	vm_size = adev->vm_manager.max_pfn * AMDGPU_GPU_PAGE_SIZE;
703 	vm_size -= AMDGPU_VA_RESERVED_SIZE;
704 	if (args->va_address + args->map_size > vm_size) {
705 		dev_dbg(dev->dev,
706 			"va_address 0x%llx is in top reserved area 0x%llx\n",
707 			args->va_address + args->map_size, vm_size);
708 		return -EINVAL;
709 	}
710 
711 	if ((args->flags & ~valid_flags) && (args->flags & ~prt_flags)) {
712 		dev_dbg(dev->dev, "invalid flags combination 0x%08X\n",
713 			args->flags);
714 		return -EINVAL;
715 	}
716 
717 	switch (args->operation) {
718 	case AMDGPU_VA_OP_MAP:
719 	case AMDGPU_VA_OP_UNMAP:
720 	case AMDGPU_VA_OP_CLEAR:
721 	case AMDGPU_VA_OP_REPLACE:
722 		break;
723 	default:
724 		dev_dbg(dev->dev, "unsupported operation %d\n",
725 			args->operation);
726 		return -EINVAL;
727 	}
728 
729 	INIT_LIST_HEAD(&list);
730 	INIT_LIST_HEAD(&duplicates);
731 	if ((args->operation != AMDGPU_VA_OP_CLEAR) &&
732 	    !(args->flags & AMDGPU_VM_PAGE_PRT)) {
733 		gobj = drm_gem_object_lookup(filp, args->handle);
734 		if (gobj == NULL)
735 			return -ENOENT;
736 		abo = gem_to_amdgpu_bo(gobj);
737 		tv.bo = &abo->tbo;
738 		if (abo->flags & AMDGPU_GEM_CREATE_VM_ALWAYS_VALID)
739 			tv.num_shared = 1;
740 		else
741 			tv.num_shared = 0;
742 		list_add(&tv.head, &list);
743 	} else {
744 		gobj = NULL;
745 		abo = NULL;
746 	}
747 
748 	amdgpu_vm_get_pd_bo(&fpriv->vm, &list, &vm_pd);
749 
750 	r = ttm_eu_reserve_buffers(&ticket, &list, true, &duplicates);
751 	if (r)
752 		goto error_unref;
753 
754 	if (abo) {
755 		bo_va = amdgpu_vm_bo_find(&fpriv->vm, abo);
756 		if (!bo_va) {
757 			r = -ENOENT;
758 			goto error_backoff;
759 		}
760 	} else if (args->operation != AMDGPU_VA_OP_CLEAR) {
761 		bo_va = fpriv->prt_va;
762 	} else {
763 		bo_va = NULL;
764 	}
765 
766 	switch (args->operation) {
767 	case AMDGPU_VA_OP_MAP:
768 		va_flags = amdgpu_gem_va_map_flags(adev, args->flags);
769 		r = amdgpu_vm_bo_map(adev, bo_va, args->va_address,
770 				     args->offset_in_bo, args->map_size,
771 				     va_flags);
772 		break;
773 	case AMDGPU_VA_OP_UNMAP:
774 		r = amdgpu_vm_bo_unmap(adev, bo_va, args->va_address);
775 		break;
776 
777 	case AMDGPU_VA_OP_CLEAR:
778 		r = amdgpu_vm_bo_clear_mappings(adev, &fpriv->vm,
779 						args->va_address,
780 						args->map_size);
781 		break;
782 	case AMDGPU_VA_OP_REPLACE:
783 		va_flags = amdgpu_gem_va_map_flags(adev, args->flags);
784 		r = amdgpu_vm_bo_replace_map(adev, bo_va, args->va_address,
785 					     args->offset_in_bo, args->map_size,
786 					     va_flags);
787 		break;
788 	default:
789 		break;
790 	}
791 	if (!r && !(args->flags & AMDGPU_VM_DELAY_UPDATE) && !amdgpu_vm_debug)
792 		amdgpu_gem_va_update_vm(adev, &fpriv->vm, bo_va,
793 					args->operation);
794 
795 error_backoff:
796 	ttm_eu_backoff_reservation(&ticket, &list);
797 
798 error_unref:
799 	drm_gem_object_put(gobj);
800 	return r;
801 }
802 
803 int amdgpu_gem_op_ioctl(struct drm_device *dev, void *data,
804 			struct drm_file *filp)
805 {
806 	struct amdgpu_device *adev = drm_to_adev(dev);
807 	struct drm_amdgpu_gem_op *args = data;
808 	struct drm_gem_object *gobj;
809 	struct amdgpu_vm_bo_base *base;
810 	struct amdgpu_bo *robj;
811 	int r;
812 
813 	gobj = drm_gem_object_lookup(filp, args->handle);
814 	if (gobj == NULL) {
815 		return -ENOENT;
816 	}
817 	robj = gem_to_amdgpu_bo(gobj);
818 
819 	r = amdgpu_bo_reserve(robj, false);
820 	if (unlikely(r))
821 		goto out;
822 
823 	switch (args->op) {
824 	case AMDGPU_GEM_OP_GET_GEM_CREATE_INFO: {
825 		struct drm_amdgpu_gem_create_in info;
826 		void __user *out = u64_to_user_ptr(args->value);
827 
828 		info.bo_size = robj->tbo.base.size;
829 		info.alignment = robj->tbo.page_alignment << PAGE_SHIFT;
830 		info.domains = robj->preferred_domains;
831 		info.domain_flags = robj->flags;
832 		amdgpu_bo_unreserve(robj);
833 		if (copy_to_user(out, &info, sizeof(info)))
834 			r = -EFAULT;
835 		break;
836 	}
837 	case AMDGPU_GEM_OP_SET_PLACEMENT:
838 		if (robj->tbo.base.import_attach &&
839 		    args->value & AMDGPU_GEM_DOMAIN_VRAM) {
840 			r = -EINVAL;
841 			amdgpu_bo_unreserve(robj);
842 			break;
843 		}
844 		if (amdgpu_ttm_tt_get_usermm(robj->tbo.ttm)) {
845 			r = -EPERM;
846 			amdgpu_bo_unreserve(robj);
847 			break;
848 		}
849 		for (base = robj->vm_bo; base; base = base->next)
850 			if (amdgpu_xgmi_same_hive(amdgpu_ttm_adev(robj->tbo.bdev),
851 				amdgpu_ttm_adev(base->vm->root.bo->tbo.bdev))) {
852 				r = -EINVAL;
853 				amdgpu_bo_unreserve(robj);
854 				goto out;
855 			}
856 
857 
858 		robj->preferred_domains = args->value & (AMDGPU_GEM_DOMAIN_VRAM |
859 							AMDGPU_GEM_DOMAIN_GTT |
860 							AMDGPU_GEM_DOMAIN_CPU);
861 		robj->allowed_domains = robj->preferred_domains;
862 		if (robj->allowed_domains == AMDGPU_GEM_DOMAIN_VRAM)
863 			robj->allowed_domains |= AMDGPU_GEM_DOMAIN_GTT;
864 
865 		if (robj->flags & AMDGPU_GEM_CREATE_VM_ALWAYS_VALID)
866 			amdgpu_vm_bo_invalidate(adev, robj, true);
867 
868 		amdgpu_bo_unreserve(robj);
869 		break;
870 	default:
871 		amdgpu_bo_unreserve(robj);
872 		r = -EINVAL;
873 	}
874 
875 out:
876 	drm_gem_object_put(gobj);
877 	return r;
878 }
879 
880 int amdgpu_mode_dumb_create(struct drm_file *file_priv,
881 			    struct drm_device *dev,
882 			    struct drm_mode_create_dumb *args)
883 {
884 	struct amdgpu_device *adev = drm_to_adev(dev);
885 	struct drm_gem_object *gobj;
886 	uint32_t handle;
887 	u64 flags = AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED |
888 		    AMDGPU_GEM_CREATE_CPU_GTT_USWC;
889 	u32 domain;
890 	int r;
891 
892 	/*
893 	 * The buffer returned from this function should be cleared, but
894 	 * it can only be done if the ring is enabled or we'll fail to
895 	 * create the buffer.
896 	 */
897 	if (adev->mman.buffer_funcs_enabled)
898 		flags |= AMDGPU_GEM_CREATE_VRAM_CLEARED;
899 
900 	args->pitch = amdgpu_align_pitch(adev, args->width,
901 					 DIV_ROUND_UP(args->bpp, 8), 0);
902 	args->size = (u64)args->pitch * args->height;
903 	args->size = ALIGN(args->size, PAGE_SIZE);
904 	domain = amdgpu_bo_get_preferred_domain(adev,
905 				amdgpu_display_supported_domains(adev, flags));
906 	r = amdgpu_gem_object_create(adev, args->size, 0, domain, flags,
907 				     ttm_bo_type_device, NULL, &gobj);
908 	if (r)
909 		return -ENOMEM;
910 
911 	r = drm_gem_handle_create(file_priv, gobj, &handle);
912 	/* drop reference from allocate - handle holds it now */
913 	drm_gem_object_put(gobj);
914 	if (r) {
915 		return r;
916 	}
917 	args->handle = handle;
918 	return 0;
919 }
920 
921 #if defined(CONFIG_DEBUG_FS)
922 static int amdgpu_debugfs_gem_info_show(struct seq_file *m, void *unused)
923 {
924 	struct amdgpu_device *adev = (struct amdgpu_device *)m->private;
925 	struct drm_device *dev = adev_to_drm(adev);
926 	struct drm_file *file;
927 	int r;
928 
929 	r = mutex_lock_interruptible(&dev->filelist_mutex);
930 	if (r)
931 		return r;
932 
933 	list_for_each_entry(file, &dev->filelist, lhead) {
934 		struct task_struct *task;
935 		struct drm_gem_object *gobj;
936 		int id;
937 
938 		/*
939 		 * Although we have a valid reference on file->pid, that does
940 		 * not guarantee that the task_struct who called get_pid() is
941 		 * still alive (e.g. get_pid(current) => fork() => exit()).
942 		 * Therefore, we need to protect this ->comm access using RCU.
943 		 */
944 		rcu_read_lock();
945 		task = pid_task(file->pid, PIDTYPE_PID);
946 		seq_printf(m, "pid %8d command %s:\n", pid_nr(file->pid),
947 			   task ? task->comm : "<unknown>");
948 		rcu_read_unlock();
949 
950 		spin_lock(&file->table_lock);
951 		idr_for_each_entry(&file->object_idr, gobj, id) {
952 			struct amdgpu_bo *bo = gem_to_amdgpu_bo(gobj);
953 
954 			amdgpu_bo_print_info(id, bo, m);
955 		}
956 		spin_unlock(&file->table_lock);
957 	}
958 
959 	mutex_unlock(&dev->filelist_mutex);
960 	return 0;
961 }
962 
963 DEFINE_SHOW_ATTRIBUTE(amdgpu_debugfs_gem_info);
964 
965 #endif
966 
967 void amdgpu_debugfs_gem_init(struct amdgpu_device *adev)
968 {
969 #if defined(CONFIG_DEBUG_FS)
970 	struct drm_minor *minor = adev_to_drm(adev)->primary;
971 	struct dentry *root = minor->debugfs_root;
972 
973 	debugfs_create_file("amdgpu_gem_info", 0444, root, adev,
974 			    &amdgpu_debugfs_gem_info_fops);
975 #endif
976 }
977