1 /*
2  * Copyright © 2016 Intel Corporation
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 (including the next
12  * paragraph) shall be included in all copies or substantial portions of the
13  * Software.
14  *
15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
21  * IN THE SOFTWARE.
22  *
23  */
24 
25 #include <linux/prime_numbers.h>
26 
27 #include "../i915_selftest.h"
28 
29 #include "mock_gem_device.h"
30 #include "mock_context.h"
31 
32 static bool assert_vma(struct i915_vma *vma,
33 		       struct drm_i915_gem_object *obj,
34 		       struct i915_gem_context *ctx)
35 {
36 	bool ok = true;
37 
38 	if (vma->vm != &ctx->ppgtt->base) {
39 		pr_err("VMA created with wrong VM\n");
40 		ok = false;
41 	}
42 
43 	if (vma->size != obj->base.size) {
44 		pr_err("VMA created with wrong size, found %llu, expected %zu\n",
45 		       vma->size, obj->base.size);
46 		ok = false;
47 	}
48 
49 	if (vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL) {
50 		pr_err("VMA created with wrong type [%d]\n",
51 		       vma->ggtt_view.type);
52 		ok = false;
53 	}
54 
55 	return ok;
56 }
57 
58 static struct i915_vma *
59 checked_vma_instance(struct drm_i915_gem_object *obj,
60 		     struct i915_address_space *vm,
61 		     struct i915_ggtt_view *view)
62 {
63 	struct i915_vma *vma;
64 	bool ok = true;
65 
66 	vma = i915_vma_instance(obj, vm, view);
67 	if (IS_ERR(vma))
68 		return vma;
69 
70 	/* Manual checks, will be reinforced by i915_vma_compare! */
71 	if (vma->vm != vm) {
72 		pr_err("VMA's vm [%p] does not match request [%p]\n",
73 		       vma->vm, vm);
74 		ok = false;
75 	}
76 
77 	if (i915_is_ggtt(vm) != i915_vma_is_ggtt(vma)) {
78 		pr_err("VMA ggtt status [%d] does not match parent [%d]\n",
79 		       i915_vma_is_ggtt(vma), i915_is_ggtt(vm));
80 		ok = false;
81 	}
82 
83 	if (i915_vma_compare(vma, vm, view)) {
84 		pr_err("i915_vma_compare failed with create parmaters!\n");
85 		return ERR_PTR(-EINVAL);
86 	}
87 
88 	if (i915_vma_compare(vma, vma->vm,
89 			     i915_vma_is_ggtt(vma) ? &vma->ggtt_view : NULL)) {
90 		pr_err("i915_vma_compare failed with itself\n");
91 		return ERR_PTR(-EINVAL);
92 	}
93 
94 	if (!ok) {
95 		pr_err("i915_vma_compare failed to detect the difference!\n");
96 		return ERR_PTR(-EINVAL);
97 	}
98 
99 	return vma;
100 }
101 
102 static int create_vmas(struct drm_i915_private *i915,
103 		       struct list_head *objects,
104 		       struct list_head *contexts)
105 {
106 	struct drm_i915_gem_object *obj;
107 	struct i915_gem_context *ctx;
108 	int pinned;
109 
110 	list_for_each_entry(obj, objects, st_link) {
111 		for (pinned = 0; pinned <= 1; pinned++) {
112 			list_for_each_entry(ctx, contexts, link) {
113 				struct i915_address_space *vm =
114 					&ctx->ppgtt->base;
115 				struct i915_vma *vma;
116 				int err;
117 
118 				vma = checked_vma_instance(obj, vm, NULL);
119 				if (IS_ERR(vma))
120 					return PTR_ERR(vma);
121 
122 				if (!assert_vma(vma, obj, ctx)) {
123 					pr_err("VMA lookup/create failed\n");
124 					return -EINVAL;
125 				}
126 
127 				if (!pinned) {
128 					err = i915_vma_pin(vma, 0, 0, PIN_USER);
129 					if (err) {
130 						pr_err("Failed to pin VMA\n");
131 						return err;
132 					}
133 				} else {
134 					i915_vma_unpin(vma);
135 				}
136 			}
137 		}
138 	}
139 
140 	return 0;
141 }
142 
143 static int igt_vma_create(void *arg)
144 {
145 	struct drm_i915_private *i915 = arg;
146 	struct drm_i915_gem_object *obj, *on;
147 	struct i915_gem_context *ctx, *cn;
148 	unsigned long num_obj, num_ctx;
149 	unsigned long no, nc;
150 	IGT_TIMEOUT(end_time);
151 	LIST_HEAD(contexts);
152 	LIST_HEAD(objects);
153 	int err;
154 
155 	/* Exercise creating many vma amonst many objections, checking the
156 	 * vma creation and lookup routines.
157 	 */
158 
159 	no = 0;
160 	for_each_prime_number(num_obj, ULONG_MAX - 1) {
161 		for (; no < num_obj; no++) {
162 			obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
163 			if (IS_ERR(obj))
164 				goto out;
165 
166 			list_add(&obj->st_link, &objects);
167 		}
168 
169 		nc = 0;
170 		for_each_prime_number(num_ctx, MAX_CONTEXT_HW_ID) {
171 			for (; nc < num_ctx; nc++) {
172 				ctx = mock_context(i915, "mock");
173 				if (!ctx)
174 					goto out;
175 
176 				list_move(&ctx->link, &contexts);
177 			}
178 
179 			err = create_vmas(i915, &objects, &contexts);
180 			if (err)
181 				goto out;
182 
183 			if (igt_timeout(end_time,
184 					"%s timed out: after %lu objects in %lu contexts\n",
185 					__func__, no, nc))
186 				goto end;
187 		}
188 
189 		list_for_each_entry_safe(ctx, cn, &contexts, link) {
190 			list_del_init(&ctx->link);
191 			mock_context_close(ctx);
192 		}
193 	}
194 
195 end:
196 	/* Final pass to lookup all created contexts */
197 	err = create_vmas(i915, &objects, &contexts);
198 out:
199 	list_for_each_entry_safe(ctx, cn, &contexts, link) {
200 		list_del_init(&ctx->link);
201 		mock_context_close(ctx);
202 	}
203 
204 	list_for_each_entry_safe(obj, on, &objects, st_link)
205 		i915_gem_object_put(obj);
206 	return err;
207 }
208 
209 struct pin_mode {
210 	u64 size;
211 	u64 flags;
212 	bool (*assert)(const struct i915_vma *,
213 		       const struct pin_mode *mode,
214 		       int result);
215 	const char *string;
216 };
217 
218 static bool assert_pin_valid(const struct i915_vma *vma,
219 			     const struct pin_mode *mode,
220 			     int result)
221 {
222 	if (result)
223 		return false;
224 
225 	if (i915_vma_misplaced(vma, mode->size, 0, mode->flags))
226 		return false;
227 
228 	return true;
229 }
230 
231 __maybe_unused
232 static bool assert_pin_enospc(const struct i915_vma *vma,
233 			      const struct pin_mode *mode,
234 			      int result)
235 {
236 	return result == -ENOSPC;
237 }
238 
239 __maybe_unused
240 static bool assert_pin_einval(const struct i915_vma *vma,
241 			      const struct pin_mode *mode,
242 			      int result)
243 {
244 	return result == -EINVAL;
245 }
246 
247 static int igt_vma_pin1(void *arg)
248 {
249 	struct drm_i915_private *i915 = arg;
250 	const struct pin_mode modes[] = {
251 #define VALID(sz, fl) { .size = (sz), .flags = (fl), .assert = assert_pin_valid, .string = #sz ", " #fl ", (valid) " }
252 #define __INVALID(sz, fl, check, eval) { .size = (sz), .flags = (fl), .assert = (check), .string = #sz ", " #fl ", (invalid " #eval ")" }
253 #define INVALID(sz, fl) __INVALID(sz, fl, assert_pin_einval, EINVAL)
254 #define NOSPACE(sz, fl) __INVALID(sz, fl, assert_pin_enospc, ENOSPC)
255 		VALID(0, PIN_GLOBAL),
256 		VALID(0, PIN_GLOBAL | PIN_MAPPABLE),
257 
258 		VALID(0, PIN_GLOBAL | PIN_OFFSET_BIAS | 4096),
259 		VALID(0, PIN_GLOBAL | PIN_OFFSET_BIAS | 8192),
260 		VALID(0, PIN_GLOBAL | PIN_OFFSET_BIAS | (i915->ggtt.mappable_end - 4096)),
261 		VALID(0, PIN_GLOBAL | PIN_MAPPABLE | PIN_OFFSET_BIAS | (i915->ggtt.mappable_end - 4096)),
262 		VALID(0, PIN_GLOBAL | PIN_OFFSET_BIAS | (i915->ggtt.base.total - 4096)),
263 
264 		VALID(0, PIN_GLOBAL | PIN_MAPPABLE | PIN_OFFSET_FIXED | (i915->ggtt.mappable_end - 4096)),
265 		INVALID(0, PIN_GLOBAL | PIN_MAPPABLE | PIN_OFFSET_FIXED | i915->ggtt.mappable_end),
266 		VALID(0, PIN_GLOBAL | PIN_OFFSET_FIXED | (i915->ggtt.base.total - 4096)),
267 		INVALID(0, PIN_GLOBAL | PIN_OFFSET_FIXED | i915->ggtt.base.total),
268 		INVALID(0, PIN_GLOBAL | PIN_OFFSET_FIXED | round_down(U64_MAX, PAGE_SIZE)),
269 
270 		VALID(4096, PIN_GLOBAL),
271 		VALID(8192, PIN_GLOBAL),
272 		VALID(i915->ggtt.mappable_end - 4096, PIN_GLOBAL | PIN_MAPPABLE),
273 		VALID(i915->ggtt.mappable_end, PIN_GLOBAL | PIN_MAPPABLE),
274 		NOSPACE(i915->ggtt.mappable_end + 4096, PIN_GLOBAL | PIN_MAPPABLE),
275 		VALID(i915->ggtt.base.total - 4096, PIN_GLOBAL),
276 		VALID(i915->ggtt.base.total, PIN_GLOBAL),
277 		NOSPACE(i915->ggtt.base.total + 4096, PIN_GLOBAL),
278 		NOSPACE(round_down(U64_MAX, PAGE_SIZE), PIN_GLOBAL),
279 		INVALID(8192, PIN_GLOBAL | PIN_MAPPABLE | PIN_OFFSET_FIXED | (i915->ggtt.mappable_end - 4096)),
280 		INVALID(8192, PIN_GLOBAL | PIN_OFFSET_FIXED | (i915->ggtt.base.total - 4096)),
281 		INVALID(8192, PIN_GLOBAL | PIN_OFFSET_FIXED | (round_down(U64_MAX, PAGE_SIZE) - 4096)),
282 
283 		VALID(8192, PIN_GLOBAL | PIN_OFFSET_BIAS | (i915->ggtt.mappable_end - 4096)),
284 
285 #if !IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
286 		/* Misusing BIAS is a programming error (it is not controllable
287 		 * from userspace) so when debugging is enabled, it explodes.
288 		 * However, the tests are still quite interesting for checking
289 		 * variable start, end and size.
290 		 */
291 		NOSPACE(0, PIN_GLOBAL | PIN_MAPPABLE | PIN_OFFSET_BIAS | i915->ggtt.mappable_end),
292 		NOSPACE(0, PIN_GLOBAL | PIN_OFFSET_BIAS | i915->ggtt.base.total),
293 		NOSPACE(8192, PIN_GLOBAL | PIN_MAPPABLE | PIN_OFFSET_BIAS | (i915->ggtt.mappable_end - 4096)),
294 		NOSPACE(8192, PIN_GLOBAL | PIN_OFFSET_BIAS | (i915->ggtt.base.total - 4096)),
295 #endif
296 		{ },
297 #undef NOSPACE
298 #undef INVALID
299 #undef __INVALID
300 #undef VALID
301 	}, *m;
302 	struct drm_i915_gem_object *obj;
303 	struct i915_vma *vma;
304 	int err = -EINVAL;
305 
306 	/* Exercise all the weird and wonderful i915_vma_pin requests,
307 	 * focusing on error handling of boundary conditions.
308 	 */
309 
310 	GEM_BUG_ON(!drm_mm_clean(&i915->ggtt.base.mm));
311 
312 	obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
313 	if (IS_ERR(obj))
314 		return PTR_ERR(obj);
315 
316 	vma = checked_vma_instance(obj, &i915->ggtt.base, NULL);
317 	if (IS_ERR(vma))
318 		goto out;
319 
320 	for (m = modes; m->assert; m++) {
321 		err = i915_vma_pin(vma, m->size, 0, m->flags);
322 		if (!m->assert(vma, m, err)) {
323 			pr_err("%s to pin single page into GGTT with mode[%d:%s]: size=%llx flags=%llx, err=%d\n",
324 			       m->assert == assert_pin_valid ? "Failed" : "Unexpectedly succeeded",
325 			       (int)(m - modes), m->string, m->size, m->flags,
326 			       err);
327 			if (!err)
328 				i915_vma_unpin(vma);
329 			err = -EINVAL;
330 			goto out;
331 		}
332 
333 		if (!err) {
334 			i915_vma_unpin(vma);
335 			err = i915_vma_unbind(vma);
336 			if (err) {
337 				pr_err("Failed to unbind single page from GGTT, err=%d\n", err);
338 				goto out;
339 			}
340 		}
341 	}
342 
343 	err = 0;
344 out:
345 	i915_gem_object_put(obj);
346 	return err;
347 }
348 
349 static unsigned long rotated_index(const struct intel_rotation_info *r,
350 				   unsigned int n,
351 				   unsigned int x,
352 				   unsigned int y)
353 {
354 	return (r->plane[n].stride * (r->plane[n].height - y - 1) +
355 		r->plane[n].offset + x);
356 }
357 
358 static struct scatterlist *
359 assert_rotated(struct drm_i915_gem_object *obj,
360 	       const struct intel_rotation_info *r, unsigned int n,
361 	       struct scatterlist *sg)
362 {
363 	unsigned int x, y;
364 
365 	for (x = 0; x < r->plane[n].width; x++) {
366 		for (y = 0; y < r->plane[n].height; y++) {
367 			unsigned long src_idx;
368 			dma_addr_t src;
369 
370 			if (!sg) {
371 				pr_err("Invalid sg table: too short at plane %d, (%d, %d)!\n",
372 				       n, x, y);
373 				return ERR_PTR(-EINVAL);
374 			}
375 
376 			src_idx = rotated_index(r, n, x, y);
377 			src = i915_gem_object_get_dma_address(obj, src_idx);
378 
379 			if (sg_dma_len(sg) != PAGE_SIZE) {
380 				pr_err("Invalid sg.length, found %d, expected %lu for rotated page (%d, %d) [src index %lu]\n",
381 				       sg_dma_len(sg), PAGE_SIZE,
382 				       x, y, src_idx);
383 				return ERR_PTR(-EINVAL);
384 			}
385 
386 			if (sg_dma_address(sg) != src) {
387 				pr_err("Invalid address for rotated page (%d, %d) [src index %lu]\n",
388 				       x, y, src_idx);
389 				return ERR_PTR(-EINVAL);
390 			}
391 
392 			sg = sg_next(sg);
393 		}
394 	}
395 
396 	return sg;
397 }
398 
399 static unsigned int rotated_size(const struct intel_rotation_plane_info *a,
400 				 const struct intel_rotation_plane_info *b)
401 {
402 	return a->width * a->height + b->width * b->height;
403 }
404 
405 static int igt_vma_rotate(void *arg)
406 {
407 	struct drm_i915_private *i915 = arg;
408 	struct i915_address_space *vm = &i915->ggtt.base;
409 	struct drm_i915_gem_object *obj;
410 	const struct intel_rotation_plane_info planes[] = {
411 		{ .width = 1, .height = 1, .stride = 1 },
412 		{ .width = 2, .height = 2, .stride = 2 },
413 		{ .width = 4, .height = 4, .stride = 4 },
414 		{ .width = 8, .height = 8, .stride = 8 },
415 
416 		{ .width = 3, .height = 5, .stride = 3 },
417 		{ .width = 3, .height = 5, .stride = 4 },
418 		{ .width = 3, .height = 5, .stride = 5 },
419 
420 		{ .width = 5, .height = 3, .stride = 5 },
421 		{ .width = 5, .height = 3, .stride = 7 },
422 		{ .width = 5, .height = 3, .stride = 9 },
423 
424 		{ .width = 4, .height = 6, .stride = 6 },
425 		{ .width = 6, .height = 4, .stride = 6 },
426 		{ }
427 	}, *a, *b;
428 	const unsigned int max_pages = 64;
429 	int err = -ENOMEM;
430 
431 	/* Create VMA for many different combinations of planes and check
432 	 * that the page layout within the rotated VMA match our expectations.
433 	 */
434 
435 	obj = i915_gem_object_create_internal(i915, max_pages * PAGE_SIZE);
436 	if (IS_ERR(obj))
437 		goto out;
438 
439 	for (a = planes; a->width; a++) {
440 		for (b = planes + ARRAY_SIZE(planes); b-- != planes; ) {
441 			struct i915_ggtt_view view;
442 			unsigned int n, max_offset;
443 
444 			max_offset = max(a->stride * a->height,
445 					 b->stride * b->height);
446 			GEM_BUG_ON(max_offset > max_pages);
447 			max_offset = max_pages - max_offset;
448 
449 			view.type = I915_GGTT_VIEW_ROTATED;
450 			view.rotated.plane[0] = *a;
451 			view.rotated.plane[1] = *b;
452 
453 			for_each_prime_number_from(view.rotated.plane[0].offset, 0, max_offset) {
454 				for_each_prime_number_from(view.rotated.plane[1].offset, 0, max_offset) {
455 					struct scatterlist *sg;
456 					struct i915_vma *vma;
457 
458 					vma = checked_vma_instance(obj, vm, &view);
459 					if (IS_ERR(vma)) {
460 						err = PTR_ERR(vma);
461 						goto out_object;
462 					}
463 
464 					err = i915_vma_pin(vma, 0, 0, PIN_GLOBAL);
465 					if (err) {
466 						pr_err("Failed to pin VMA, err=%d\n", err);
467 						goto out_object;
468 					}
469 
470 					if (vma->size != rotated_size(a, b) * PAGE_SIZE) {
471 						pr_err("VMA is wrong size, expected %lu, found %llu\n",
472 						       PAGE_SIZE * rotated_size(a, b), vma->size);
473 						err = -EINVAL;
474 						goto out_object;
475 					}
476 
477 					if (vma->pages->nents != rotated_size(a, b)) {
478 						pr_err("sg table is wrong sizeo, expected %u, found %u nents\n",
479 						       rotated_size(a, b), vma->pages->nents);
480 						err = -EINVAL;
481 						goto out_object;
482 					}
483 
484 					if (vma->node.size < vma->size) {
485 						pr_err("VMA binding too small, expected %llu, found %llu\n",
486 						       vma->size, vma->node.size);
487 						err = -EINVAL;
488 						goto out_object;
489 					}
490 
491 					if (vma->pages == obj->mm.pages) {
492 						pr_err("VMA using unrotated object pages!\n");
493 						err = -EINVAL;
494 						goto out_object;
495 					}
496 
497 					sg = vma->pages->sgl;
498 					for (n = 0; n < ARRAY_SIZE(view.rotated.plane); n++) {
499 						sg = assert_rotated(obj, &view.rotated, n, sg);
500 						if (IS_ERR(sg)) {
501 							pr_err("Inconsistent VMA pages for plane %d: [(%d, %d, %d, %d), (%d, %d, %d, %d)]\n", n,
502 							       view.rotated.plane[0].width,
503 							       view.rotated.plane[0].height,
504 							       view.rotated.plane[0].stride,
505 							       view.rotated.plane[0].offset,
506 							       view.rotated.plane[1].width,
507 							       view.rotated.plane[1].height,
508 							       view.rotated.plane[1].stride,
509 							       view.rotated.plane[1].offset);
510 							err = -EINVAL;
511 							goto out_object;
512 						}
513 					}
514 
515 					i915_vma_unpin(vma);
516 				}
517 			}
518 		}
519 	}
520 
521 out_object:
522 	i915_gem_object_put(obj);
523 out:
524 	return err;
525 }
526 
527 static bool assert_partial(struct drm_i915_gem_object *obj,
528 			   struct i915_vma *vma,
529 			   unsigned long offset,
530 			   unsigned long size)
531 {
532 	struct sgt_iter sgt;
533 	dma_addr_t dma;
534 
535 	for_each_sgt_dma(dma, sgt, vma->pages) {
536 		dma_addr_t src;
537 
538 		if (!size) {
539 			pr_err("Partial scattergather list too long\n");
540 			return false;
541 		}
542 
543 		src = i915_gem_object_get_dma_address(obj, offset);
544 		if (src != dma) {
545 			pr_err("DMA mismatch for partial page offset %lu\n",
546 			       offset);
547 			return false;
548 		}
549 
550 		offset++;
551 		size--;
552 	}
553 
554 	return true;
555 }
556 
557 static bool assert_pin(struct i915_vma *vma,
558 		       struct i915_ggtt_view *view,
559 		       u64 size,
560 		       const char *name)
561 {
562 	bool ok = true;
563 
564 	if (vma->size != size) {
565 		pr_err("(%s) VMA is wrong size, expected %llu, found %llu\n",
566 		       name, size, vma->size);
567 		ok = false;
568 	}
569 
570 	if (vma->node.size < vma->size) {
571 		pr_err("(%s) VMA binding too small, expected %llu, found %llu\n",
572 		       name, vma->size, vma->node.size);
573 		ok = false;
574 	}
575 
576 	if (view && view->type != I915_GGTT_VIEW_NORMAL) {
577 		if (memcmp(&vma->ggtt_view, view, sizeof(*view))) {
578 			pr_err("(%s) VMA mismatch upon creation!\n",
579 			       name);
580 			ok = false;
581 		}
582 
583 		if (vma->pages == vma->obj->mm.pages) {
584 			pr_err("(%s) VMA using original object pages!\n",
585 			       name);
586 			ok = false;
587 		}
588 	} else {
589 		if (vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL) {
590 			pr_err("Not the normal ggtt view! Found %d\n",
591 			       vma->ggtt_view.type);
592 			ok = false;
593 		}
594 
595 		if (vma->pages != vma->obj->mm.pages) {
596 			pr_err("VMA not using object pages!\n");
597 			ok = false;
598 		}
599 	}
600 
601 	return ok;
602 }
603 
604 static int igt_vma_partial(void *arg)
605 {
606 	struct drm_i915_private *i915 = arg;
607 	struct i915_address_space *vm = &i915->ggtt.base;
608 	const unsigned int npages = 1021; /* prime! */
609 	struct drm_i915_gem_object *obj;
610 	const struct phase {
611 		const char *name;
612 	} phases[] = {
613 		{ "create" },
614 		{ "lookup" },
615 		{ },
616 	}, *p;
617 	unsigned int sz, offset;
618 	struct i915_vma *vma;
619 	int err = -ENOMEM;
620 
621 	/* Create lots of different VMA for the object and check that
622 	 * we are returned the same VMA when we later request the same range.
623 	 */
624 
625 	obj = i915_gem_object_create_internal(i915, npages*PAGE_SIZE);
626 	if (IS_ERR(obj))
627 		goto out;
628 
629 	for (p = phases; p->name; p++) { /* exercise both create/lookup */
630 		unsigned int count, nvma;
631 
632 		nvma = 0;
633 		for_each_prime_number_from(sz, 1, npages) {
634 			for_each_prime_number_from(offset, 0, npages - sz) {
635 				struct i915_ggtt_view view;
636 
637 				view.type = I915_GGTT_VIEW_PARTIAL;
638 				view.partial.offset = offset;
639 				view.partial.size = sz;
640 
641 				if (sz == npages)
642 					view.type = I915_GGTT_VIEW_NORMAL;
643 
644 				vma = checked_vma_instance(obj, vm, &view);
645 				if (IS_ERR(vma)) {
646 					err = PTR_ERR(vma);
647 					goto out_object;
648 				}
649 
650 				err = i915_vma_pin(vma, 0, 0, PIN_GLOBAL);
651 				if (err)
652 					goto out_object;
653 
654 				if (!assert_pin(vma, &view, sz*PAGE_SIZE, p->name)) {
655 					pr_err("(%s) Inconsistent partial pinning for (offset=%d, size=%d)\n",
656 					       p->name, offset, sz);
657 					err = -EINVAL;
658 					goto out_object;
659 				}
660 
661 				if (!assert_partial(obj, vma, offset, sz)) {
662 					pr_err("(%s) Inconsistent partial pages for (offset=%d, size=%d)\n",
663 					       p->name, offset, sz);
664 					err = -EINVAL;
665 					goto out_object;
666 				}
667 
668 				i915_vma_unpin(vma);
669 				nvma++;
670 			}
671 		}
672 
673 		count = 0;
674 		list_for_each_entry(vma, &obj->vma_list, obj_link)
675 			count++;
676 		if (count != nvma) {
677 			pr_err("(%s) All partial vma were not recorded on the obj->vma_list: found %u, expected %u\n",
678 			       p->name, count, nvma);
679 			err = -EINVAL;
680 			goto out_object;
681 		}
682 
683 		/* Check that we did create the whole object mapping */
684 		vma = checked_vma_instance(obj, vm, NULL);
685 		if (IS_ERR(vma)) {
686 			err = PTR_ERR(vma);
687 			goto out_object;
688 		}
689 
690 		err = i915_vma_pin(vma, 0, 0, PIN_GLOBAL);
691 		if (err)
692 			goto out_object;
693 
694 		if (!assert_pin(vma, NULL, obj->base.size, p->name)) {
695 			pr_err("(%s) inconsistent full pin\n", p->name);
696 			err = -EINVAL;
697 			goto out_object;
698 		}
699 
700 		i915_vma_unpin(vma);
701 
702 		count = 0;
703 		list_for_each_entry(vma, &obj->vma_list, obj_link)
704 			count++;
705 		if (count != nvma) {
706 			pr_err("(%s) allocated an extra full vma!\n", p->name);
707 			err = -EINVAL;
708 			goto out_object;
709 		}
710 	}
711 
712 out_object:
713 	i915_gem_object_put(obj);
714 out:
715 	return err;
716 }
717 
718 int i915_vma_mock_selftests(void)
719 {
720 	static const struct i915_subtest tests[] = {
721 		SUBTEST(igt_vma_create),
722 		SUBTEST(igt_vma_pin1),
723 		SUBTEST(igt_vma_rotate),
724 		SUBTEST(igt_vma_partial),
725 	};
726 	struct drm_i915_private *i915;
727 	int err;
728 
729 	i915 = mock_gem_device();
730 	if (!i915)
731 		return -ENOMEM;
732 
733 	mutex_lock(&i915->drm.struct_mutex);
734 	err = i915_subtests(tests, i915);
735 	mutex_unlock(&i915->drm.struct_mutex);
736 
737 	drm_dev_unref(&i915->drm);
738 	return err;
739 }
740 
741