xref: /linux/drivers/gpu/drm/tests/drm_rect_test.c (revision d639d9fa162aadec1ae9980c4dcf6e50bd2f8290)
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Test cases for the drm_rect functions
4  *
5  * Copyright (c) 2022 Maíra Canal <mairacanal@riseup.net>
6  */
7 
8 #include <kunit/test.h>
9 
10 #include <drm/drm_rect.h>
11 #include <drm/drm_mode.h>
12 
13 #include <linux/limits.h>
14 #include <linux/string_helpers.h>
15 #include <linux/errno.h>
16 
17 static void drm_rect_compare(struct kunit *test, const struct drm_rect *r,
18 			     const struct drm_rect *expected)
19 {
20 	KUNIT_EXPECT_EQ(test, r->x1, expected->x1);
21 	KUNIT_EXPECT_EQ(test, r->y1, expected->y1);
22 	KUNIT_EXPECT_EQ(test, drm_rect_width(r), drm_rect_width(expected));
23 	KUNIT_EXPECT_EQ(test, drm_rect_height(r), drm_rect_height(expected));
24 }
25 
26 static void drm_test_rect_clip_scaled_div_by_zero(struct kunit *test)
27 {
28 	struct drm_rect src, dst, clip;
29 	bool visible;
30 
31 	/*
32 	 * Make sure we don't divide by zero when dst
33 	 * width/height is zero and dst and clip do not intersect.
34 	 */
35 	drm_rect_init(&src, 0, 0, 0, 0);
36 	drm_rect_init(&dst, 0, 0, 0, 0);
37 	drm_rect_init(&clip, 1, 1, 1, 1);
38 	visible = drm_rect_clip_scaled(&src, &dst, &clip);
39 
40 	KUNIT_EXPECT_FALSE_MSG(test, visible, "Destination not be visible\n");
41 	KUNIT_EXPECT_FALSE_MSG(test, drm_rect_visible(&src), "Source should not be visible\n");
42 
43 	drm_rect_init(&src, 0, 0, 0, 0);
44 	drm_rect_init(&dst, 3, 3, 0, 0);
45 	drm_rect_init(&clip, 1, 1, 1, 1);
46 	visible = drm_rect_clip_scaled(&src, &dst, &clip);
47 
48 	KUNIT_EXPECT_FALSE_MSG(test, visible, "Destination not be visible\n");
49 	KUNIT_EXPECT_FALSE_MSG(test, drm_rect_visible(&src), "Source should not be visible\n");
50 }
51 
52 static void drm_test_rect_clip_scaled_not_clipped(struct kunit *test)
53 {
54 	struct drm_rect src, dst, clip;
55 	bool visible;
56 
57 	/* 1:1 scaling */
58 	drm_rect_init(&src, 0, 0, 1 << 16, 1 << 16);
59 	drm_rect_init(&dst, 0, 0, 1, 1);
60 	drm_rect_init(&clip, 0, 0, 1, 1);
61 
62 	visible = drm_rect_clip_scaled(&src, &dst, &clip);
63 
64 	KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 1 << 16 ||
65 			       src.y1 != 0 || src.y2 != 1 << 16, "Source badly clipped\n");
66 	KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 1 ||
67 			       dst.y1 != 0 || dst.y2 != 1, "Destination badly clipped\n");
68 	KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
69 	KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
70 
71 	/* 2:1 scaling */
72 	drm_rect_init(&src, 0, 0, 2 << 16, 2 << 16);
73 	drm_rect_init(&dst, 0, 0, 1, 1);
74 	drm_rect_init(&clip, 0, 0, 1, 1);
75 
76 	visible = drm_rect_clip_scaled(&src, &dst, &clip);
77 
78 	KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 2 << 16 ||
79 			       src.y1 != 0 || src.y2 != 2 << 16, "Source badly clipped\n");
80 	KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 1 ||
81 			       dst.y1 != 0 || dst.y2 != 1, "Destination badly clipped\n");
82 	KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
83 	KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
84 
85 	/* 1:2 scaling */
86 	drm_rect_init(&src, 0, 0, 1 << 16, 1 << 16);
87 	drm_rect_init(&dst, 0, 0, 2, 2);
88 	drm_rect_init(&clip, 0, 0, 2, 2);
89 
90 	visible = drm_rect_clip_scaled(&src, &dst, &clip);
91 
92 	KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 1 << 16 ||
93 			       src.y1 != 0 || src.y2 != 1 << 16, "Source badly clipped\n");
94 	KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 2 ||
95 			       dst.y1 != 0 || dst.y2 != 2, "Destination badly clipped\n");
96 	KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
97 	KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
98 }
99 
100 static void drm_test_rect_clip_scaled_clipped(struct kunit *test)
101 {
102 	struct drm_rect src, dst, clip;
103 	bool visible;
104 
105 	/* 1:1 scaling top/left clip */
106 	drm_rect_init(&src, 0, 0, 2 << 16, 2 << 16);
107 	drm_rect_init(&dst, 0, 0, 2, 2);
108 	drm_rect_init(&clip, 0, 0, 1, 1);
109 
110 	visible = drm_rect_clip_scaled(&src, &dst, &clip);
111 
112 	KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 1 << 16 ||
113 			       src.y1 != 0 || src.y2 != 1 << 16, "Source badly clipped\n");
114 	KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 1 ||
115 			       dst.y1 != 0 || dst.y2 != 1, "Destination badly clipped\n");
116 	KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
117 	KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
118 
119 	/* 1:1 scaling bottom/right clip */
120 	drm_rect_init(&src, 0, 0, 2 << 16, 2 << 16);
121 	drm_rect_init(&dst, 0, 0, 2, 2);
122 	drm_rect_init(&clip, 1, 1, 1, 1);
123 
124 	visible = drm_rect_clip_scaled(&src, &dst, &clip);
125 
126 	KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 1 << 16 || src.x2 != 2 << 16 ||
127 			       src.y1 != 1 << 16 || src.y2 != 2 << 16, "Source badly clipped\n");
128 	KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 1 || dst.x2 != 2 || dst.y1 != 1 ||
129 			       dst.y2 != 2, "Destination badly clipped\n");
130 	KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
131 	KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
132 
133 	/* 2:1 scaling top/left clip */
134 	drm_rect_init(&src, 0, 0, 4 << 16, 4 << 16);
135 	drm_rect_init(&dst, 0, 0, 2, 2);
136 	drm_rect_init(&clip, 0, 0, 1, 1);
137 
138 	visible = drm_rect_clip_scaled(&src, &dst, &clip);
139 
140 	KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 2 << 16 ||
141 			       src.y1 != 0 || src.y2 != 2 << 16, "Source badly clipped\n");
142 	KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 1 || dst.y1 != 0 ||
143 			       dst.y2 != 1, "Destination badly clipped\n");
144 	KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
145 	KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
146 
147 	/* 2:1 scaling bottom/right clip */
148 	drm_rect_init(&src, 0, 0, 4 << 16, 4 << 16);
149 	drm_rect_init(&dst, 0, 0, 2, 2);
150 	drm_rect_init(&clip, 1, 1, 1, 1);
151 
152 	visible = drm_rect_clip_scaled(&src, &dst, &clip);
153 
154 	KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 2 << 16 || src.x2 != 4 << 16 ||
155 			       src.y1 != 2 << 16 || src.y2 != 4 << 16, "Source badly clipped\n");
156 	KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 1 || dst.x2 != 2 || dst.y1 != 1 ||
157 			       dst.y2 != 2, "Destination badly clipped\n");
158 	KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
159 	KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
160 
161 	/* 1:2 scaling top/left clip */
162 	drm_rect_init(&src, 0, 0, 2 << 16, 2 << 16);
163 	drm_rect_init(&dst, 0, 0, 4, 4);
164 	drm_rect_init(&clip, 0, 0, 2, 2);
165 
166 	visible = drm_rect_clip_scaled(&src, &dst, &clip);
167 
168 	KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 0 || src.x2 != 1 << 16 ||
169 			       src.y1 != 0 || src.y2 != 1 << 16, "Source badly clipped\n");
170 	KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 0 || dst.x2 != 2 || dst.y1 != 0 ||
171 			       dst.y2 != 2, "Destination badly clipped\n");
172 	KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
173 	KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
174 
175 	/* 1:2 scaling bottom/right clip */
176 	drm_rect_init(&src, 0, 0, 2 << 16, 2 << 16);
177 	drm_rect_init(&dst, 0, 0, 4, 4);
178 	drm_rect_init(&clip, 2, 2, 2, 2);
179 
180 	visible = drm_rect_clip_scaled(&src, &dst, &clip);
181 
182 	KUNIT_EXPECT_FALSE_MSG(test, src.x1 != 1 << 16 || src.x2 != 2 << 16 ||
183 			       src.y1 != 1 << 16 || src.y2 != 2 << 16, "Source badly clipped\n");
184 	KUNIT_EXPECT_FALSE_MSG(test, dst.x1 != 2 || dst.x2 != 4 || dst.y1 != 2 ||
185 			       dst.y2 != 4, "Destination badly clipped\n");
186 	KUNIT_EXPECT_TRUE_MSG(test, visible, "Destination should be visible\n");
187 	KUNIT_EXPECT_TRUE_MSG(test, drm_rect_visible(&src), "Source should be visible\n");
188 }
189 
190 static void drm_test_rect_clip_scaled_signed_vs_unsigned(struct kunit *test)
191 {
192 	struct drm_rect src, dst, clip;
193 	bool visible;
194 
195 	/*
196 	 * 'clip.x2 - dst.x1 >= dst width' could result a negative
197 	 * src rectangle width which is no longer expected by the
198 	 * code as it's using unsigned types. This could lead to
199 	 * the clipped source rectangle appering visible when it
200 	 * should have been fully clipped. Make sure both rectangles
201 	 * end up invisible.
202 	 */
203 	drm_rect_init(&src, 0, 0, INT_MAX, INT_MAX);
204 	drm_rect_init(&dst, 0, 0, 2, 2);
205 	drm_rect_init(&clip, 3, 3, 1, 1);
206 
207 	visible = drm_rect_clip_scaled(&src, &dst, &clip);
208 
209 	KUNIT_EXPECT_FALSE_MSG(test, visible, "Destination should not be visible\n");
210 	KUNIT_EXPECT_FALSE_MSG(test, drm_rect_visible(&src), "Source should not be visible\n");
211 }
212 
213 struct drm_rect_intersect_case {
214 	const char *description;
215 	struct drm_rect r1, r2;
216 	bool should_be_visible;
217 	struct drm_rect expected_intersection;
218 };
219 
220 static const struct drm_rect_intersect_case drm_rect_intersect_cases[] = {
221 	{
222 		.description = "top-left x bottom-right",
223 		.r1 = DRM_RECT_INIT(1, 1, 2, 2),
224 		.r2 = DRM_RECT_INIT(0, 0, 2, 2),
225 		.should_be_visible = true,
226 		.expected_intersection = DRM_RECT_INIT(1, 1, 1, 1),
227 	},
228 	{
229 		.description = "top-right x bottom-left",
230 		.r1 = DRM_RECT_INIT(0, 0, 2, 2),
231 		.r2 = DRM_RECT_INIT(1, -1, 2, 2),
232 		.should_be_visible = true,
233 		.expected_intersection = DRM_RECT_INIT(1, 0, 1, 1),
234 	},
235 	{
236 		.description = "bottom-left x top-right",
237 		.r1 = DRM_RECT_INIT(1, -1, 2, 2),
238 		.r2 = DRM_RECT_INIT(0, 0, 2, 2),
239 		.should_be_visible = true,
240 		.expected_intersection = DRM_RECT_INIT(1, 0, 1, 1),
241 	},
242 	{
243 		.description = "bottom-right x top-left",
244 		.r1 = DRM_RECT_INIT(0, 0, 2, 2),
245 		.r2 = DRM_RECT_INIT(1, 1, 2, 2),
246 		.should_be_visible = true,
247 		.expected_intersection = DRM_RECT_INIT(1, 1, 1, 1),
248 	},
249 	{
250 		.description = "right x left",
251 		.r1 = DRM_RECT_INIT(0, 0, 2, 1),
252 		.r2 = DRM_RECT_INIT(1, 0, 3, 1),
253 		.should_be_visible = true,
254 		.expected_intersection = DRM_RECT_INIT(1, 0, 1, 1),
255 	},
256 	{
257 		.description = "left x right",
258 		.r1 = DRM_RECT_INIT(1, 0, 3, 1),
259 		.r2 = DRM_RECT_INIT(0, 0, 2, 1),
260 		.should_be_visible = true,
261 		.expected_intersection = DRM_RECT_INIT(1, 0, 1, 1),
262 	},
263 	{
264 		.description = "up x bottom",
265 		.r1 = DRM_RECT_INIT(0, 0, 1, 2),
266 		.r2 = DRM_RECT_INIT(0, -1, 1, 3),
267 		.should_be_visible = true,
268 		.expected_intersection = DRM_RECT_INIT(0, 0, 1, 2),
269 	},
270 	{
271 		.description = "bottom x up",
272 		.r1 = DRM_RECT_INIT(0, -1, 1, 3),
273 		.r2 = DRM_RECT_INIT(0, 0, 1, 2),
274 		.should_be_visible = true,
275 		.expected_intersection = DRM_RECT_INIT(0, 0, 1, 2),
276 	},
277 	{
278 		.description = "touching corner",
279 		.r1 = DRM_RECT_INIT(0, 0, 1, 1),
280 		.r2 = DRM_RECT_INIT(1, 1, 2, 2),
281 		.should_be_visible = false,
282 		.expected_intersection = DRM_RECT_INIT(1, 1, 0, 0),
283 	},
284 	{
285 		.description = "touching side",
286 		.r1 = DRM_RECT_INIT(0, 0, 1, 1),
287 		.r2 = DRM_RECT_INIT(1, 0, 1, 1),
288 		.should_be_visible = false,
289 		.expected_intersection = DRM_RECT_INIT(1, 0, 0, 1),
290 	},
291 	{
292 		.description = "equal rects",
293 		.r1 = DRM_RECT_INIT(0, 0, 2, 2),
294 		.r2 = DRM_RECT_INIT(0, 0, 2, 2),
295 		.should_be_visible = true,
296 		.expected_intersection = DRM_RECT_INIT(0, 0, 2, 2),
297 	},
298 	{
299 		.description = "inside another",
300 		.r1 = DRM_RECT_INIT(0, 0, 2, 2),
301 		.r2 = DRM_RECT_INIT(1, 1, 1, 1),
302 		.should_be_visible = true,
303 		.expected_intersection = DRM_RECT_INIT(1, 1, 1, 1),
304 	},
305 	{
306 		.description = "far away",
307 		.r1 = DRM_RECT_INIT(0, 0, 1, 1),
308 		.r2 = DRM_RECT_INIT(3, 6, 1, 1),
309 		.should_be_visible = false,
310 		.expected_intersection = DRM_RECT_INIT(3, 6, -2, -5),
311 	},
312 	{
313 		.description = "points intersecting",
314 		.r1 = DRM_RECT_INIT(5, 10, 0, 0),
315 		.r2 = DRM_RECT_INIT(5, 10, 0, 0),
316 		.should_be_visible = false,
317 		.expected_intersection = DRM_RECT_INIT(5, 10, 0, 0),
318 	},
319 	{
320 		.description = "points not intersecting",
321 		.r1 = DRM_RECT_INIT(0, 0, 0, 0),
322 		.r2 = DRM_RECT_INIT(5, 10, 0, 0),
323 		.should_be_visible = false,
324 		.expected_intersection = DRM_RECT_INIT(5, 10, -5, -10),
325 	},
326 };
327 
328 static void drm_rect_intersect_case_desc(const struct drm_rect_intersect_case *t, char *desc)
329 {
330 	snprintf(desc, KUNIT_PARAM_DESC_SIZE,
331 		 "%s: " DRM_RECT_FMT " x " DRM_RECT_FMT,
332 		 t->description, DRM_RECT_ARG(&t->r1), DRM_RECT_ARG(&t->r2));
333 }
334 
335 KUNIT_ARRAY_PARAM(drm_rect_intersect, drm_rect_intersect_cases, drm_rect_intersect_case_desc);
336 
337 static void drm_test_rect_intersect(struct kunit *test)
338 {
339 	const struct drm_rect_intersect_case *params = test->param_value;
340 	struct drm_rect r1_aux = params->r1;
341 	bool visible;
342 
343 	visible = drm_rect_intersect(&r1_aux, &params->r2);
344 
345 	KUNIT_EXPECT_EQ(test, visible, params->should_be_visible);
346 	drm_rect_compare(test, &r1_aux, &params->expected_intersection);
347 }
348 
349 struct drm_rect_scale_case {
350 	const char *name;
351 	struct drm_rect src, dst;
352 	int min_range, max_range;
353 	int expected_scaling_factor;
354 };
355 
356 static const struct drm_rect_scale_case drm_rect_scale_cases[] = {
357 	{
358 		.name = "normal use",
359 		.src = DRM_RECT_INIT(0, 0, 2 << 16, 2 << 16),
360 		.dst = DRM_RECT_INIT(0, 0, 1 << 16, 1 << 16),
361 		.min_range = 0, .max_range = INT_MAX,
362 		.expected_scaling_factor = 2,
363 	},
364 	{
365 		.name = "out of max range",
366 		.src = DRM_RECT_INIT(0, 0, 10 << 16, 10 << 16),
367 		.dst = DRM_RECT_INIT(0, 0, 1 << 16, 1 << 16),
368 		.min_range = 3, .max_range = 5,
369 		.expected_scaling_factor = -ERANGE,
370 	},
371 	{
372 		.name = "out of min range",
373 		.src = DRM_RECT_INIT(0, 0, 2 << 16, 2 << 16),
374 		.dst = DRM_RECT_INIT(0, 0, 1 << 16, 1 << 16),
375 		.min_range = 3, .max_range = 5,
376 		.expected_scaling_factor = -ERANGE,
377 	},
378 	{
379 		.name = "zero dst",
380 		.src = DRM_RECT_INIT(0, 0, 2 << 16, 2 << 16),
381 		.dst = DRM_RECT_INIT(0, 0, 0 << 16, 0 << 16),
382 		.min_range = 0, .max_range = INT_MAX,
383 		.expected_scaling_factor = 0,
384 	},
385 	{
386 		.name = "negative src",
387 		.src = DRM_RECT_INIT(0, 0, -(1 << 16), -(1 << 16)),
388 		.dst = DRM_RECT_INIT(0, 0, 1 << 16, 1 << 16),
389 		.min_range = 0, .max_range = INT_MAX,
390 		.expected_scaling_factor = -EINVAL,
391 	},
392 	{
393 		.name = "negative dst",
394 		.src = DRM_RECT_INIT(0, 0, 1 << 16, 1 << 16),
395 		.dst = DRM_RECT_INIT(0, 0, -(1 << 16), -(1 << 16)),
396 		.min_range = 0, .max_range = INT_MAX,
397 		.expected_scaling_factor = -EINVAL,
398 	},
399 };
400 
401 static void drm_rect_scale_case_desc(const struct drm_rect_scale_case *t, char *desc)
402 {
403 	strscpy(desc, t->name, KUNIT_PARAM_DESC_SIZE);
404 }
405 
406 KUNIT_ARRAY_PARAM(drm_rect_scale, drm_rect_scale_cases, drm_rect_scale_case_desc);
407 
408 static void drm_test_rect_calc_hscale(struct kunit *test)
409 {
410 	const struct drm_rect_scale_case *params = test->param_value;
411 	int expected_warnings = params->expected_scaling_factor == -EINVAL;
412 	int scaling_factor = INT_MIN;
413 
414 	/*
415 	 * Without CONFIG_BUG, WARN_ON() is a no-op and the suppressed warning
416 	 * count stays zero, failing the assertion.
417 	 */
418 	if (expected_warnings && !IS_ENABLED(CONFIG_BUG))
419 		kunit_skip(test, "requires CONFIG_BUG");
420 
421 	/*
422 	 * drm_rect_calc_hscale() generates a warning backtrace whenever bad
423 	 * parameters are passed to it. This affects unit tests with -EINVAL
424 	 * error code in expected_scaling_factor.
425 	 */
426 	kunit_warning_suppress(test) {
427 		scaling_factor = drm_rect_calc_hscale(&params->src, &params->dst,
428 						      params->min_range,
429 						      params->max_range);
430 		KUNIT_EXPECT_SUPPRESSED_WARNING_COUNT(test, expected_warnings);
431 	}
432 
433 	KUNIT_EXPECT_EQ(test, scaling_factor, params->expected_scaling_factor);
434 }
435 
436 static void drm_test_rect_calc_vscale(struct kunit *test)
437 {
438 	const struct drm_rect_scale_case *params = test->param_value;
439 	int expected_warnings = params->expected_scaling_factor == -EINVAL;
440 	int scaling_factor = INT_MIN;
441 
442 	/*
443 	 * Without CONFIG_BUG, WARN_ON() is a no-op and the suppressed warning
444 	 * count stays zero, failing the assertion.
445 	 */
446 	if (expected_warnings && !IS_ENABLED(CONFIG_BUG))
447 		kunit_skip(test, "requires CONFIG_BUG");
448 
449 	/*
450 	 * drm_rect_calc_vscale() generates a warning backtrace whenever bad
451 	 * parameters are passed to it. This affects unit tests with -EINVAL
452 	 * error code in expected_scaling_factor.
453 	 */
454 	kunit_warning_suppress(test) {
455 		scaling_factor = drm_rect_calc_vscale(&params->src, &params->dst,
456 						      params->min_range, params->max_range);
457 		KUNIT_EXPECT_SUPPRESSED_WARNING_COUNT(test, expected_warnings);
458 	}
459 
460 	KUNIT_EXPECT_EQ(test, scaling_factor, params->expected_scaling_factor);
461 }
462 
463 struct drm_rect_rotate_case {
464 	const char *name;
465 	unsigned int rotation;
466 	struct drm_rect rect;
467 	int width, height;
468 	struct drm_rect expected;
469 };
470 
471 static const struct drm_rect_rotate_case drm_rect_rotate_cases[] = {
472 	{
473 		.name = "reflect-x",
474 		.rotation = DRM_MODE_REFLECT_X,
475 		.rect = DRM_RECT_INIT(0, 0, 5, 5),
476 		.width = 5, .height = 10,
477 		.expected = DRM_RECT_INIT(0, 0, 5, 5),
478 	},
479 	{
480 		.name = "reflect-y",
481 		.rotation = DRM_MODE_REFLECT_Y,
482 		.rect = DRM_RECT_INIT(2, 0, 5, 5),
483 		.width = 5, .height = 10,
484 		.expected = DRM_RECT_INIT(2, 5, 5, 5),
485 	},
486 	{
487 		.name = "rotate-0",
488 		.rotation = DRM_MODE_ROTATE_0,
489 		.rect = DRM_RECT_INIT(0, 2, 5, 5),
490 		.width = 5, .height = 10,
491 		.expected = DRM_RECT_INIT(0, 2, 5, 5),
492 	},
493 	{
494 		.name = "rotate-90",
495 		.rotation = DRM_MODE_ROTATE_90,
496 		.rect = DRM_RECT_INIT(0, 0, 5, 10),
497 		.width = 5, .height = 10,
498 		.expected = DRM_RECT_INIT(0, 0, 10, 5),
499 	},
500 	{
501 		.name = "rotate-180",
502 		.rotation = DRM_MODE_ROTATE_180,
503 		.rect = DRM_RECT_INIT(11, 3, 5, 10),
504 		.width = 5, .height = 10,
505 		.expected = DRM_RECT_INIT(-11, -3, 5, 10),
506 	},
507 	{
508 		.name = "rotate-270",
509 		.rotation = DRM_MODE_ROTATE_270,
510 		.rect = DRM_RECT_INIT(6, 3, 5, 10),
511 		.width = 5, .height = 10,
512 		.expected = DRM_RECT_INIT(-3, 6, 10, 5),
513 	},
514 };
515 
516 static void drm_rect_rotate_case_desc(const struct drm_rect_rotate_case *t, char *desc)
517 {
518 	strscpy(desc, t->name, KUNIT_PARAM_DESC_SIZE);
519 }
520 
521 KUNIT_ARRAY_PARAM(drm_rect_rotate, drm_rect_rotate_cases, drm_rect_rotate_case_desc);
522 
523 static void drm_test_rect_rotate(struct kunit *test)
524 {
525 	const struct drm_rect_rotate_case *params = test->param_value;
526 	struct drm_rect r = params->rect;
527 
528 	drm_rect_rotate(&r, params->width, params->height, params->rotation);
529 
530 	drm_rect_compare(test, &r, &params->expected);
531 }
532 
533 static void drm_test_rect_rotate_inv(struct kunit *test)
534 {
535 	const struct drm_rect_rotate_case *params = test->param_value;
536 	struct drm_rect r = params->expected;
537 
538 	drm_rect_rotate_inv(&r, params->width, params->height, params->rotation);
539 
540 	drm_rect_compare(test, &r, &params->rect);
541 }
542 
543 static struct kunit_case drm_rect_tests[] = {
544 	KUNIT_CASE(drm_test_rect_clip_scaled_div_by_zero),
545 	KUNIT_CASE(drm_test_rect_clip_scaled_not_clipped),
546 	KUNIT_CASE(drm_test_rect_clip_scaled_clipped),
547 	KUNIT_CASE(drm_test_rect_clip_scaled_signed_vs_unsigned),
548 	KUNIT_CASE_PARAM(drm_test_rect_intersect, drm_rect_intersect_gen_params),
549 	KUNIT_CASE_PARAM(drm_test_rect_calc_hscale, drm_rect_scale_gen_params),
550 	KUNIT_CASE_PARAM(drm_test_rect_calc_vscale, drm_rect_scale_gen_params),
551 	KUNIT_CASE_PARAM(drm_test_rect_rotate, drm_rect_rotate_gen_params),
552 	KUNIT_CASE_PARAM(drm_test_rect_rotate_inv, drm_rect_rotate_gen_params),
553 	{ }
554 };
555 
556 static struct kunit_suite drm_rect_test_suite = {
557 	.name = "drm_rect",
558 	.test_cases = drm_rect_tests,
559 };
560 
561 kunit_test_suite(drm_rect_test_suite);
562 
563 MODULE_DESCRIPTION("Test cases for the drm_rect functions");
564 MODULE_LICENSE("GPL");
565