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 "gem/i915_gem_context.h"
28 #include "gem/selftests/mock_context.h"
29 
30 #include "i915_scatterlist.h"
31 #include "i915_selftest.h"
32 
33 #include "mock_gem_device.h"
34 #include "mock_gtt.h"
35 
36 static bool assert_vma(struct i915_vma *vma,
37 		       struct drm_i915_gem_object *obj,
38 		       struct i915_gem_context *ctx)
39 {
40 	bool ok = true;
41 
42 	if (vma->vm != rcu_access_pointer(ctx->vm)) {
43 		pr_err("VMA created with wrong VM\n");
44 		ok = false;
45 	}
46 
47 	if (vma->size != obj->base.size) {
48 		pr_err("VMA created with wrong size, found %llu, expected %zu\n",
49 		       vma->size, obj->base.size);
50 		ok = false;
51 	}
52 
53 	if (vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL) {
54 		pr_err("VMA created with wrong type [%d]\n",
55 		       vma->ggtt_view.type);
56 		ok = false;
57 	}
58 
59 	return ok;
60 }
61 
62 static struct i915_vma *
63 checked_vma_instance(struct drm_i915_gem_object *obj,
64 		     struct i915_address_space *vm,
65 		     const struct i915_ggtt_view *view)
66 {
67 	struct i915_vma *vma;
68 	bool ok = true;
69 
70 	vma = i915_vma_instance(obj, vm, view);
71 	if (IS_ERR(vma))
72 		return vma;
73 
74 	/* Manual checks, will be reinforced by i915_vma_compare! */
75 	if (vma->vm != vm) {
76 		pr_err("VMA's vm [%p] does not match request [%p]\n",
77 		       vma->vm, vm);
78 		ok = false;
79 	}
80 
81 	if (i915_is_ggtt(vm) != i915_vma_is_ggtt(vma)) {
82 		pr_err("VMA ggtt status [%d] does not match parent [%d]\n",
83 		       i915_vma_is_ggtt(vma), i915_is_ggtt(vm));
84 		ok = false;
85 	}
86 
87 	if (i915_vma_compare(vma, vm, view)) {
88 		pr_err("i915_vma_compare failed with create parameters!\n");
89 		return ERR_PTR(-EINVAL);
90 	}
91 
92 	if (i915_vma_compare(vma, vma->vm,
93 			     i915_vma_is_ggtt(vma) ? &vma->ggtt_view : NULL)) {
94 		pr_err("i915_vma_compare failed with itself\n");
95 		return ERR_PTR(-EINVAL);
96 	}
97 
98 	if (!ok) {
99 		pr_err("i915_vma_compare failed to detect the difference!\n");
100 		return ERR_PTR(-EINVAL);
101 	}
102 
103 	return vma;
104 }
105 
106 static int create_vmas(struct drm_i915_private *i915,
107 		       struct list_head *objects,
108 		       struct list_head *contexts)
109 {
110 	struct drm_i915_gem_object *obj;
111 	struct i915_gem_context *ctx;
112 	int pinned;
113 
114 	list_for_each_entry(obj, objects, st_link) {
115 		for (pinned = 0; pinned <= 1; pinned++) {
116 			list_for_each_entry(ctx, contexts, link) {
117 				struct i915_address_space *vm;
118 				struct i915_vma *vma;
119 				int err;
120 
121 				vm = i915_gem_context_get_vm_rcu(ctx);
122 				vma = checked_vma_instance(obj, vm, NULL);
123 				i915_vm_put(vm);
124 				if (IS_ERR(vma))
125 					return PTR_ERR(vma);
126 
127 				if (!assert_vma(vma, obj, ctx)) {
128 					pr_err("VMA lookup/create failed\n");
129 					return -EINVAL;
130 				}
131 
132 				if (!pinned) {
133 					err = i915_vma_pin(vma, 0, 0, PIN_USER);
134 					if (err) {
135 						pr_err("Failed to pin VMA\n");
136 						return err;
137 					}
138 				} else {
139 					i915_vma_unpin(vma);
140 				}
141 			}
142 		}
143 	}
144 
145 	return 0;
146 }
147 
148 static int igt_vma_create(void *arg)
149 {
150 	struct i915_ggtt *ggtt = arg;
151 	struct drm_i915_private *i915 = ggtt->vm.i915;
152 	struct drm_i915_gem_object *obj, *on;
153 	struct i915_gem_context *ctx, *cn;
154 	unsigned long num_obj, num_ctx;
155 	unsigned long no, nc;
156 	IGT_TIMEOUT(end_time);
157 	LIST_HEAD(contexts);
158 	LIST_HEAD(objects);
159 	int err = -ENOMEM;
160 
161 	/* Exercise creating many vma amonst many objections, checking the
162 	 * vma creation and lookup routines.
163 	 */
164 
165 	no = 0;
166 	for_each_prime_number(num_obj, ULONG_MAX - 1) {
167 		for (; no < num_obj; no++) {
168 			obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
169 			if (IS_ERR(obj))
170 				goto out;
171 
172 			list_add(&obj->st_link, &objects);
173 		}
174 
175 		nc = 0;
176 		for_each_prime_number(num_ctx, 2 * BITS_PER_LONG) {
177 			for (; nc < num_ctx; nc++) {
178 				ctx = mock_context(i915, "mock");
179 				if (!ctx)
180 					goto out;
181 
182 				list_move(&ctx->link, &contexts);
183 			}
184 
185 			err = create_vmas(i915, &objects, &contexts);
186 			if (err)
187 				goto out;
188 
189 			if (igt_timeout(end_time,
190 					"%s timed out: after %lu objects in %lu contexts\n",
191 					__func__, no, nc))
192 				goto end;
193 		}
194 
195 		list_for_each_entry_safe(ctx, cn, &contexts, link) {
196 			list_del_init(&ctx->link);
197 			mock_context_close(ctx);
198 		}
199 
200 		cond_resched();
201 	}
202 
203 end:
204 	/* Final pass to lookup all created contexts */
205 	err = create_vmas(i915, &objects, &contexts);
206 out:
207 	list_for_each_entry_safe(ctx, cn, &contexts, link) {
208 		list_del_init(&ctx->link);
209 		mock_context_close(ctx);
210 	}
211 
212 	list_for_each_entry_safe(obj, on, &objects, st_link)
213 		i915_gem_object_put(obj);
214 	return err;
215 }
216 
217 struct pin_mode {
218 	u64 size;
219 	u64 flags;
220 	bool (*assert)(const struct i915_vma *,
221 		       const struct pin_mode *mode,
222 		       int result);
223 	const char *string;
224 };
225 
226 static bool assert_pin_valid(const struct i915_vma *vma,
227 			     const struct pin_mode *mode,
228 			     int result)
229 {
230 	if (result)
231 		return false;
232 
233 	if (i915_vma_misplaced(vma, mode->size, 0, mode->flags))
234 		return false;
235 
236 	return true;
237 }
238 
239 __maybe_unused
240 static bool assert_pin_enospc(const struct i915_vma *vma,
241 			      const struct pin_mode *mode,
242 			      int result)
243 {
244 	return result == -ENOSPC;
245 }
246 
247 __maybe_unused
248 static bool assert_pin_einval(const struct i915_vma *vma,
249 			      const struct pin_mode *mode,
250 			      int result)
251 {
252 	return result == -EINVAL;
253 }
254 
255 static int igt_vma_pin1(void *arg)
256 {
257 	struct i915_ggtt *ggtt = arg;
258 	const struct pin_mode modes[] = {
259 #define VALID(sz, fl) { .size = (sz), .flags = (fl), .assert = assert_pin_valid, .string = #sz ", " #fl ", (valid) " }
260 #define __INVALID(sz, fl, check, eval) { .size = (sz), .flags = (fl), .assert = (check), .string = #sz ", " #fl ", (invalid " #eval ")" }
261 #define INVALID(sz, fl) __INVALID(sz, fl, assert_pin_einval, EINVAL)
262 #define NOSPACE(sz, fl) __INVALID(sz, fl, assert_pin_enospc, ENOSPC)
263 		VALID(0, PIN_GLOBAL),
264 		VALID(0, PIN_GLOBAL | PIN_MAPPABLE),
265 
266 		VALID(0, PIN_GLOBAL | PIN_OFFSET_BIAS | 4096),
267 		VALID(0, PIN_GLOBAL | PIN_OFFSET_BIAS | 8192),
268 		VALID(0, PIN_GLOBAL | PIN_OFFSET_BIAS | (ggtt->mappable_end - 4096)),
269 		VALID(0, PIN_GLOBAL | PIN_MAPPABLE | PIN_OFFSET_BIAS | (ggtt->mappable_end - 4096)),
270 		VALID(0, PIN_GLOBAL | PIN_OFFSET_BIAS | (ggtt->vm.total - 4096)),
271 
272 		VALID(0, PIN_GLOBAL | PIN_MAPPABLE | PIN_OFFSET_FIXED | (ggtt->mappable_end - 4096)),
273 		INVALID(0, PIN_GLOBAL | PIN_MAPPABLE | PIN_OFFSET_FIXED | ggtt->mappable_end),
274 		VALID(0, PIN_GLOBAL | PIN_OFFSET_FIXED | (ggtt->vm.total - 4096)),
275 		INVALID(0, PIN_GLOBAL | PIN_OFFSET_FIXED | ggtt->vm.total),
276 		INVALID(0, PIN_GLOBAL | PIN_OFFSET_FIXED | round_down(U64_MAX, PAGE_SIZE)),
277 
278 		VALID(4096, PIN_GLOBAL),
279 		VALID(8192, PIN_GLOBAL),
280 		VALID(ggtt->mappable_end - 4096, PIN_GLOBAL | PIN_MAPPABLE),
281 		VALID(ggtt->mappable_end, PIN_GLOBAL | PIN_MAPPABLE),
282 		NOSPACE(ggtt->mappable_end + 4096, PIN_GLOBAL | PIN_MAPPABLE),
283 		VALID(ggtt->vm.total - 4096, PIN_GLOBAL),
284 		VALID(ggtt->vm.total, PIN_GLOBAL),
285 		NOSPACE(ggtt->vm.total + 4096, PIN_GLOBAL),
286 		NOSPACE(round_down(U64_MAX, PAGE_SIZE), PIN_GLOBAL),
287 		INVALID(8192, PIN_GLOBAL | PIN_MAPPABLE | PIN_OFFSET_FIXED | (ggtt->mappable_end - 4096)),
288 		INVALID(8192, PIN_GLOBAL | PIN_OFFSET_FIXED | (ggtt->vm.total - 4096)),
289 		INVALID(8192, PIN_GLOBAL | PIN_OFFSET_FIXED | (round_down(U64_MAX, PAGE_SIZE) - 4096)),
290 
291 		VALID(8192, PIN_GLOBAL | PIN_OFFSET_BIAS | (ggtt->mappable_end - 4096)),
292 
293 #if !IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
294 		/* Misusing BIAS is a programming error (it is not controllable
295 		 * from userspace) so when debugging is enabled, it explodes.
296 		 * However, the tests are still quite interesting for checking
297 		 * variable start, end and size.
298 		 */
299 		NOSPACE(0, PIN_GLOBAL | PIN_MAPPABLE | PIN_OFFSET_BIAS | ggtt->mappable_end),
300 		NOSPACE(0, PIN_GLOBAL | PIN_OFFSET_BIAS | ggtt->vm.total),
301 		NOSPACE(8192, PIN_GLOBAL | PIN_MAPPABLE | PIN_OFFSET_BIAS | (ggtt->mappable_end - 4096)),
302 		NOSPACE(8192, PIN_GLOBAL | PIN_OFFSET_BIAS | (ggtt->vm.total - 4096)),
303 #endif
304 		{ },
305 #undef NOSPACE
306 #undef INVALID
307 #undef __INVALID
308 #undef VALID
309 	}, *m;
310 	struct drm_i915_gem_object *obj;
311 	struct i915_vma *vma;
312 	int err = -EINVAL;
313 
314 	/* Exercise all the weird and wonderful i915_vma_pin requests,
315 	 * focusing on error handling of boundary conditions.
316 	 */
317 
318 	GEM_BUG_ON(!drm_mm_clean(&ggtt->vm.mm));
319 
320 	obj = i915_gem_object_create_internal(ggtt->vm.i915, PAGE_SIZE);
321 	if (IS_ERR(obj))
322 		return PTR_ERR(obj);
323 
324 	vma = checked_vma_instance(obj, &ggtt->vm, NULL);
325 	if (IS_ERR(vma))
326 		goto out;
327 
328 	for (m = modes; m->assert; m++) {
329 		err = i915_vma_pin(vma, m->size, 0, m->flags);
330 		if (!m->assert(vma, m, err)) {
331 			pr_err("%s to pin single page into GGTT with mode[%d:%s]: size=%llx flags=%llx, err=%d\n",
332 			       m->assert == assert_pin_valid ? "Failed" : "Unexpectedly succeeded",
333 			       (int)(m - modes), m->string, m->size, m->flags,
334 			       err);
335 			if (!err)
336 				i915_vma_unpin(vma);
337 			err = -EINVAL;
338 			goto out;
339 		}
340 
341 		if (!err) {
342 			i915_vma_unpin(vma);
343 			err = i915_vma_unbind(vma);
344 			if (err) {
345 				pr_err("Failed to unbind single page from GGTT, err=%d\n", err);
346 				goto out;
347 			}
348 		}
349 
350 		cond_resched();
351 	}
352 
353 	err = 0;
354 out:
355 	i915_gem_object_put(obj);
356 	return err;
357 }
358 
359 static unsigned long rotated_index(const struct intel_rotation_info *r,
360 				   unsigned int n,
361 				   unsigned int x,
362 				   unsigned int y)
363 {
364 	return (r->plane[n].stride * (r->plane[n].height - y - 1) +
365 		r->plane[n].offset + x);
366 }
367 
368 static struct scatterlist *
369 assert_rotated(struct drm_i915_gem_object *obj,
370 	       const struct intel_rotation_info *r, unsigned int n,
371 	       struct scatterlist *sg)
372 {
373 	unsigned int x, y;
374 
375 	for (x = 0; x < r->plane[n].width; x++) {
376 		for (y = 0; y < r->plane[n].height; y++) {
377 			unsigned long src_idx;
378 			dma_addr_t src;
379 
380 			if (!sg) {
381 				pr_err("Invalid sg table: too short at plane %d, (%d, %d)!\n",
382 				       n, x, y);
383 				return ERR_PTR(-EINVAL);
384 			}
385 
386 			src_idx = rotated_index(r, n, x, y);
387 			src = i915_gem_object_get_dma_address(obj, src_idx);
388 
389 			if (sg_dma_len(sg) != PAGE_SIZE) {
390 				pr_err("Invalid sg.length, found %d, expected %lu for rotated page (%d, %d) [src index %lu]\n",
391 				       sg_dma_len(sg), PAGE_SIZE,
392 				       x, y, src_idx);
393 				return ERR_PTR(-EINVAL);
394 			}
395 
396 			if (sg_dma_address(sg) != src) {
397 				pr_err("Invalid address for rotated page (%d, %d) [src index %lu]\n",
398 				       x, y, src_idx);
399 				return ERR_PTR(-EINVAL);
400 			}
401 
402 			sg = sg_next(sg);
403 		}
404 	}
405 
406 	return sg;
407 }
408 
409 static unsigned long remapped_index(const struct intel_remapped_info *r,
410 				    unsigned int n,
411 				    unsigned int x,
412 				    unsigned int y)
413 {
414 	return (r->plane[n].stride * y +
415 		r->plane[n].offset + x);
416 }
417 
418 static struct scatterlist *
419 assert_remapped(struct drm_i915_gem_object *obj,
420 		const struct intel_remapped_info *r, unsigned int n,
421 		struct scatterlist *sg)
422 {
423 	unsigned int x, y;
424 	unsigned int left = 0;
425 	unsigned int offset;
426 
427 	for (y = 0; y < r->plane[n].height; y++) {
428 		for (x = 0; x < r->plane[n].width; x++) {
429 			unsigned long src_idx;
430 			dma_addr_t src;
431 
432 			if (!sg) {
433 				pr_err("Invalid sg table: too short at plane %d, (%d, %d)!\n",
434 				       n, x, y);
435 				return ERR_PTR(-EINVAL);
436 			}
437 			if (!left) {
438 				offset = 0;
439 				left = sg_dma_len(sg);
440 			}
441 
442 			src_idx = remapped_index(r, n, x, y);
443 			src = i915_gem_object_get_dma_address(obj, src_idx);
444 
445 			if (left < PAGE_SIZE || left & (PAGE_SIZE-1)) {
446 				pr_err("Invalid sg.length, found %d, expected %lu for remapped page (%d, %d) [src index %lu]\n",
447 				       sg_dma_len(sg), PAGE_SIZE,
448 				       x, y, src_idx);
449 				return ERR_PTR(-EINVAL);
450 			}
451 
452 			if (sg_dma_address(sg) + offset != src) {
453 				pr_err("Invalid address for remapped page (%d, %d) [src index %lu]\n",
454 				       x, y, src_idx);
455 				return ERR_PTR(-EINVAL);
456 			}
457 
458 			left -= PAGE_SIZE;
459 			offset += PAGE_SIZE;
460 
461 
462 			if (!left)
463 				sg = sg_next(sg);
464 		}
465 	}
466 
467 	return sg;
468 }
469 
470 static unsigned int rotated_size(const struct intel_remapped_plane_info *a,
471 				 const struct intel_remapped_plane_info *b)
472 {
473 	return a->width * a->height + b->width * b->height;
474 }
475 
476 static int igt_vma_rotate_remap(void *arg)
477 {
478 	struct i915_ggtt *ggtt = arg;
479 	struct i915_address_space *vm = &ggtt->vm;
480 	struct drm_i915_gem_object *obj;
481 	const struct intel_remapped_plane_info planes[] = {
482 		{ .width = 1, .height = 1, .stride = 1 },
483 		{ .width = 2, .height = 2, .stride = 2 },
484 		{ .width = 4, .height = 4, .stride = 4 },
485 		{ .width = 8, .height = 8, .stride = 8 },
486 
487 		{ .width = 3, .height = 5, .stride = 3 },
488 		{ .width = 3, .height = 5, .stride = 4 },
489 		{ .width = 3, .height = 5, .stride = 5 },
490 
491 		{ .width = 5, .height = 3, .stride = 5 },
492 		{ .width = 5, .height = 3, .stride = 7 },
493 		{ .width = 5, .height = 3, .stride = 9 },
494 
495 		{ .width = 4, .height = 6, .stride = 6 },
496 		{ .width = 6, .height = 4, .stride = 6 },
497 		{ }
498 	}, *a, *b;
499 	enum i915_ggtt_view_type types[] = {
500 		I915_GGTT_VIEW_ROTATED,
501 		I915_GGTT_VIEW_REMAPPED,
502 		0,
503 	}, *t;
504 	const unsigned int max_pages = 64;
505 	int err = -ENOMEM;
506 
507 	/* Create VMA for many different combinations of planes and check
508 	 * that the page layout within the rotated VMA match our expectations.
509 	 */
510 
511 	obj = i915_gem_object_create_internal(vm->i915, max_pages * PAGE_SIZE);
512 	if (IS_ERR(obj))
513 		goto out;
514 
515 	for (t = types; *t; t++) {
516 	for (a = planes; a->width; a++) {
517 		for (b = planes + ARRAY_SIZE(planes); b-- != planes; ) {
518 			struct i915_ggtt_view view;
519 			unsigned int n, max_offset;
520 
521 			max_offset = max(a->stride * a->height,
522 					 b->stride * b->height);
523 			GEM_BUG_ON(max_offset > max_pages);
524 			max_offset = max_pages - max_offset;
525 
526 			view.type = *t;
527 			view.rotated.plane[0] = *a;
528 			view.rotated.plane[1] = *b;
529 
530 			for_each_prime_number_from(view.rotated.plane[0].offset, 0, max_offset) {
531 				for_each_prime_number_from(view.rotated.plane[1].offset, 0, max_offset) {
532 					struct scatterlist *sg;
533 					struct i915_vma *vma;
534 
535 					vma = checked_vma_instance(obj, vm, &view);
536 					if (IS_ERR(vma)) {
537 						err = PTR_ERR(vma);
538 						goto out_object;
539 					}
540 
541 					err = i915_vma_pin(vma, 0, 0, PIN_GLOBAL);
542 					if (err) {
543 						pr_err("Failed to pin VMA, err=%d\n", err);
544 						goto out_object;
545 					}
546 
547 					if (view.type == I915_GGTT_VIEW_ROTATED &&
548 					    vma->size != rotated_size(a, b) * PAGE_SIZE) {
549 						pr_err("VMA is wrong size, expected %lu, found %llu\n",
550 						       PAGE_SIZE * rotated_size(a, b), vma->size);
551 						err = -EINVAL;
552 						goto out_object;
553 					}
554 
555 					if (view.type == I915_GGTT_VIEW_REMAPPED &&
556 					    vma->size > rotated_size(a, b) * PAGE_SIZE) {
557 						pr_err("VMA is wrong size, expected %lu, found %llu\n",
558 						       PAGE_SIZE * rotated_size(a, b), vma->size);
559 						err = -EINVAL;
560 						goto out_object;
561 					}
562 
563 					if (vma->pages->nents > rotated_size(a, b)) {
564 						pr_err("sg table is wrong sizeo, expected %u, found %u nents\n",
565 						       rotated_size(a, b), vma->pages->nents);
566 						err = -EINVAL;
567 						goto out_object;
568 					}
569 
570 					if (vma->node.size < vma->size) {
571 						pr_err("VMA binding too small, expected %llu, found %llu\n",
572 						       vma->size, vma->node.size);
573 						err = -EINVAL;
574 						goto out_object;
575 					}
576 
577 					if (vma->pages == obj->mm.pages) {
578 						pr_err("VMA using unrotated object pages!\n");
579 						err = -EINVAL;
580 						goto out_object;
581 					}
582 
583 					sg = vma->pages->sgl;
584 					for (n = 0; n < ARRAY_SIZE(view.rotated.plane); n++) {
585 						if (view.type == I915_GGTT_VIEW_ROTATED)
586 							sg = assert_rotated(obj, &view.rotated, n, sg);
587 						else
588 							sg = assert_remapped(obj, &view.remapped, n, sg);
589 						if (IS_ERR(sg)) {
590 							pr_err("Inconsistent %s VMA pages for plane %d: [(%d, %d, %d, %d), (%d, %d, %d, %d)]\n",
591 							       view.type == I915_GGTT_VIEW_ROTATED ?
592 							       "rotated" : "remapped", n,
593 							       view.rotated.plane[0].width,
594 							       view.rotated.plane[0].height,
595 							       view.rotated.plane[0].stride,
596 							       view.rotated.plane[0].offset,
597 							       view.rotated.plane[1].width,
598 							       view.rotated.plane[1].height,
599 							       view.rotated.plane[1].stride,
600 							       view.rotated.plane[1].offset);
601 							err = -EINVAL;
602 							goto out_object;
603 						}
604 					}
605 
606 					i915_vma_unpin(vma);
607 
608 					cond_resched();
609 				}
610 			}
611 		}
612 	}
613 	}
614 
615 out_object:
616 	i915_gem_object_put(obj);
617 out:
618 	return err;
619 }
620 
621 static bool assert_partial(struct drm_i915_gem_object *obj,
622 			   struct i915_vma *vma,
623 			   unsigned long offset,
624 			   unsigned long size)
625 {
626 	struct sgt_iter sgt;
627 	dma_addr_t dma;
628 
629 	for_each_sgt_daddr(dma, sgt, vma->pages) {
630 		dma_addr_t src;
631 
632 		if (!size) {
633 			pr_err("Partial scattergather list too long\n");
634 			return false;
635 		}
636 
637 		src = i915_gem_object_get_dma_address(obj, offset);
638 		if (src != dma) {
639 			pr_err("DMA mismatch for partial page offset %lu\n",
640 			       offset);
641 			return false;
642 		}
643 
644 		offset++;
645 		size--;
646 	}
647 
648 	return true;
649 }
650 
651 static bool assert_pin(struct i915_vma *vma,
652 		       struct i915_ggtt_view *view,
653 		       u64 size,
654 		       const char *name)
655 {
656 	bool ok = true;
657 
658 	if (vma->size != size) {
659 		pr_err("(%s) VMA is wrong size, expected %llu, found %llu\n",
660 		       name, size, vma->size);
661 		ok = false;
662 	}
663 
664 	if (vma->node.size < vma->size) {
665 		pr_err("(%s) VMA binding too small, expected %llu, found %llu\n",
666 		       name, vma->size, vma->node.size);
667 		ok = false;
668 	}
669 
670 	if (view && view->type != I915_GGTT_VIEW_NORMAL) {
671 		if (memcmp(&vma->ggtt_view, view, sizeof(*view))) {
672 			pr_err("(%s) VMA mismatch upon creation!\n",
673 			       name);
674 			ok = false;
675 		}
676 
677 		if (vma->pages == vma->obj->mm.pages) {
678 			pr_err("(%s) VMA using original object pages!\n",
679 			       name);
680 			ok = false;
681 		}
682 	} else {
683 		if (vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL) {
684 			pr_err("Not the normal ggtt view! Found %d\n",
685 			       vma->ggtt_view.type);
686 			ok = false;
687 		}
688 
689 		if (vma->pages != vma->obj->mm.pages) {
690 			pr_err("VMA not using object pages!\n");
691 			ok = false;
692 		}
693 	}
694 
695 	return ok;
696 }
697 
698 static int igt_vma_partial(void *arg)
699 {
700 	struct i915_ggtt *ggtt = arg;
701 	struct i915_address_space *vm = &ggtt->vm;
702 	const unsigned int npages = 1021; /* prime! */
703 	struct drm_i915_gem_object *obj;
704 	const struct phase {
705 		const char *name;
706 	} phases[] = {
707 		{ "create" },
708 		{ "lookup" },
709 		{ },
710 	}, *p;
711 	unsigned int sz, offset;
712 	struct i915_vma *vma;
713 	int err = -ENOMEM;
714 
715 	/* Create lots of different VMA for the object and check that
716 	 * we are returned the same VMA when we later request the same range.
717 	 */
718 
719 	obj = i915_gem_object_create_internal(vm->i915, npages * PAGE_SIZE);
720 	if (IS_ERR(obj))
721 		goto out;
722 
723 	for (p = phases; p->name; p++) { /* exercise both create/lookup */
724 		unsigned int count, nvma;
725 
726 		nvma = 0;
727 		for_each_prime_number_from(sz, 1, npages) {
728 			for_each_prime_number_from(offset, 0, npages - sz) {
729 				struct i915_ggtt_view view;
730 
731 				view.type = I915_GGTT_VIEW_PARTIAL;
732 				view.partial.offset = offset;
733 				view.partial.size = sz;
734 
735 				if (sz == npages)
736 					view.type = I915_GGTT_VIEW_NORMAL;
737 
738 				vma = checked_vma_instance(obj, vm, &view);
739 				if (IS_ERR(vma)) {
740 					err = PTR_ERR(vma);
741 					goto out_object;
742 				}
743 
744 				err = i915_vma_pin(vma, 0, 0, PIN_GLOBAL);
745 				if (err)
746 					goto out_object;
747 
748 				if (!assert_pin(vma, &view, sz*PAGE_SIZE, p->name)) {
749 					pr_err("(%s) Inconsistent partial pinning for (offset=%d, size=%d)\n",
750 					       p->name, offset, sz);
751 					err = -EINVAL;
752 					goto out_object;
753 				}
754 
755 				if (!assert_partial(obj, vma, offset, sz)) {
756 					pr_err("(%s) Inconsistent partial pages for (offset=%d, size=%d)\n",
757 					       p->name, offset, sz);
758 					err = -EINVAL;
759 					goto out_object;
760 				}
761 
762 				i915_vma_unpin(vma);
763 				nvma++;
764 
765 				cond_resched();
766 			}
767 		}
768 
769 		count = 0;
770 		list_for_each_entry(vma, &obj->vma.list, obj_link)
771 			count++;
772 		if (count != nvma) {
773 			pr_err("(%s) All partial vma were not recorded on the obj->vma_list: found %u, expected %u\n",
774 			       p->name, count, nvma);
775 			err = -EINVAL;
776 			goto out_object;
777 		}
778 
779 		/* Check that we did create the whole object mapping */
780 		vma = checked_vma_instance(obj, vm, NULL);
781 		if (IS_ERR(vma)) {
782 			err = PTR_ERR(vma);
783 			goto out_object;
784 		}
785 
786 		err = i915_vma_pin(vma, 0, 0, PIN_GLOBAL);
787 		if (err)
788 			goto out_object;
789 
790 		if (!assert_pin(vma, NULL, obj->base.size, p->name)) {
791 			pr_err("(%s) inconsistent full pin\n", p->name);
792 			err = -EINVAL;
793 			goto out_object;
794 		}
795 
796 		i915_vma_unpin(vma);
797 
798 		count = 0;
799 		list_for_each_entry(vma, &obj->vma.list, obj_link)
800 			count++;
801 		if (count != nvma) {
802 			pr_err("(%s) allocated an extra full vma!\n", p->name);
803 			err = -EINVAL;
804 			goto out_object;
805 		}
806 	}
807 
808 out_object:
809 	i915_gem_object_put(obj);
810 out:
811 	return err;
812 }
813 
814 int i915_vma_mock_selftests(void)
815 {
816 	static const struct i915_subtest tests[] = {
817 		SUBTEST(igt_vma_create),
818 		SUBTEST(igt_vma_pin1),
819 		SUBTEST(igt_vma_rotate_remap),
820 		SUBTEST(igt_vma_partial),
821 	};
822 	struct drm_i915_private *i915;
823 	struct i915_ggtt *ggtt;
824 	int err;
825 
826 	i915 = mock_gem_device();
827 	if (!i915)
828 		return -ENOMEM;
829 
830 	ggtt = kmalloc(sizeof(*ggtt), GFP_KERNEL);
831 	if (!ggtt) {
832 		err = -ENOMEM;
833 		goto out_put;
834 	}
835 	mock_init_ggtt(i915, ggtt);
836 
837 	err = i915_subtests(tests, ggtt);
838 
839 	mock_device_flush(i915);
840 	i915_gem_drain_freed_objects(i915);
841 	mock_fini_ggtt(ggtt);
842 	kfree(ggtt);
843 out_put:
844 	drm_dev_put(&i915->drm);
845 	return err;
846 }
847 
848 static int igt_vma_remapped_gtt(void *arg)
849 {
850 	struct drm_i915_private *i915 = arg;
851 	const struct intel_remapped_plane_info planes[] = {
852 		{ .width = 1, .height = 1, .stride = 1 },
853 		{ .width = 2, .height = 2, .stride = 2 },
854 		{ .width = 4, .height = 4, .stride = 4 },
855 		{ .width = 8, .height = 8, .stride = 8 },
856 
857 		{ .width = 3, .height = 5, .stride = 3 },
858 		{ .width = 3, .height = 5, .stride = 4 },
859 		{ .width = 3, .height = 5, .stride = 5 },
860 
861 		{ .width = 5, .height = 3, .stride = 5 },
862 		{ .width = 5, .height = 3, .stride = 7 },
863 		{ .width = 5, .height = 3, .stride = 9 },
864 
865 		{ .width = 4, .height = 6, .stride = 6 },
866 		{ .width = 6, .height = 4, .stride = 6 },
867 		{ }
868 	}, *p;
869 	enum i915_ggtt_view_type types[] = {
870 		I915_GGTT_VIEW_ROTATED,
871 		I915_GGTT_VIEW_REMAPPED,
872 		0,
873 	}, *t;
874 	struct drm_i915_gem_object *obj;
875 	intel_wakeref_t wakeref;
876 	int err = 0;
877 
878 	obj = i915_gem_object_create_internal(i915, 10 * 10 * PAGE_SIZE);
879 	if (IS_ERR(obj))
880 		return PTR_ERR(obj);
881 
882 	wakeref = intel_runtime_pm_get(&i915->runtime_pm);
883 
884 	for (t = types; *t; t++) {
885 		for (p = planes; p->width; p++) {
886 			struct i915_ggtt_view view = {
887 				.type = *t,
888 				.rotated.plane[0] = *p,
889 			};
890 			struct i915_vma *vma;
891 			u32 __iomem *map;
892 			unsigned int x, y;
893 			int err;
894 
895 			i915_gem_object_lock(obj);
896 			err = i915_gem_object_set_to_gtt_domain(obj, true);
897 			i915_gem_object_unlock(obj);
898 			if (err)
899 				goto out;
900 
901 			vma = i915_gem_object_ggtt_pin(obj, &view, 0, 0, PIN_MAPPABLE);
902 			if (IS_ERR(vma)) {
903 				err = PTR_ERR(vma);
904 				goto out;
905 			}
906 
907 			GEM_BUG_ON(vma->ggtt_view.type != *t);
908 
909 			map = i915_vma_pin_iomap(vma);
910 			i915_vma_unpin(vma);
911 			if (IS_ERR(map)) {
912 				err = PTR_ERR(map);
913 				goto out;
914 			}
915 
916 			for (y = 0 ; y < p->height; y++) {
917 				for (x = 0 ; x < p->width; x++) {
918 					unsigned int offset;
919 					u32 val = y << 16 | x;
920 
921 					if (*t == I915_GGTT_VIEW_ROTATED)
922 						offset = (x * p->height + y) * PAGE_SIZE;
923 					else
924 						offset = (y * p->width + x) * PAGE_SIZE;
925 
926 					iowrite32(val, &map[offset / sizeof(*map)]);
927 				}
928 			}
929 
930 			i915_vma_unpin_iomap(vma);
931 
932 			vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, PIN_MAPPABLE);
933 			if (IS_ERR(vma)) {
934 				err = PTR_ERR(vma);
935 				goto out;
936 			}
937 
938 			GEM_BUG_ON(vma->ggtt_view.type != I915_GGTT_VIEW_NORMAL);
939 
940 			map = i915_vma_pin_iomap(vma);
941 			i915_vma_unpin(vma);
942 			if (IS_ERR(map)) {
943 				err = PTR_ERR(map);
944 				goto out;
945 			}
946 
947 			for (y = 0 ; y < p->height; y++) {
948 				for (x = 0 ; x < p->width; x++) {
949 					unsigned int offset, src_idx;
950 					u32 exp = y << 16 | x;
951 					u32 val;
952 
953 					if (*t == I915_GGTT_VIEW_ROTATED)
954 						src_idx = rotated_index(&view.rotated, 0, x, y);
955 					else
956 						src_idx = remapped_index(&view.remapped, 0, x, y);
957 					offset = src_idx * PAGE_SIZE;
958 
959 					val = ioread32(&map[offset / sizeof(*map)]);
960 					if (val != exp) {
961 						pr_err("%s VMA write test failed, expected 0x%x, found 0x%x\n",
962 						       *t == I915_GGTT_VIEW_ROTATED ? "Rotated" : "Remapped",
963 						       val, exp);
964 						i915_vma_unpin_iomap(vma);
965 						goto out;
966 					}
967 				}
968 			}
969 			i915_vma_unpin_iomap(vma);
970 
971 			cond_resched();
972 		}
973 	}
974 
975 out:
976 	intel_runtime_pm_put(&i915->runtime_pm, wakeref);
977 	i915_gem_object_put(obj);
978 
979 	return err;
980 }
981 
982 int i915_vma_live_selftests(struct drm_i915_private *i915)
983 {
984 	static const struct i915_subtest tests[] = {
985 		SUBTEST(igt_vma_remapped_gtt),
986 	};
987 
988 	return i915_subtests(tests, i915);
989 }
990