1 /*
2  * SPDX-License-Identifier: MIT
3  *
4  * Copyright © 2018 Intel Corporation
5  */
6 
7 #include <linux/random.h>
8 
9 #include "gem/selftests/igt_gem_utils.h"
10 #include "gem/selftests/mock_context.h"
11 #include "gem/i915_gem_pm.h"
12 #include "gt/intel_gt.h"
13 #include "gt/intel_gt_pm.h"
14 
15 #include "i915_selftest.h"
16 
17 #include "igt_flush_test.h"
18 #include "mock_drm.h"
19 
20 static int switch_to_context(struct i915_gem_context *ctx)
21 {
22 	struct i915_gem_engines_iter it;
23 	struct intel_context *ce;
24 	int err = 0;
25 
26 	for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it) {
27 		struct i915_request *rq;
28 
29 		rq = intel_context_create_request(ce);
30 		if (IS_ERR(rq)) {
31 			err = PTR_ERR(rq);
32 			break;
33 		}
34 
35 		i915_request_add(rq);
36 	}
37 	i915_gem_context_unlock_engines(ctx);
38 
39 	return err;
40 }
41 
42 static void trash_stolen(struct drm_i915_private *i915)
43 {
44 	struct i915_ggtt *ggtt = &i915->ggtt;
45 	const u64 slot = ggtt->error_capture.start;
46 	const resource_size_t size = resource_size(&i915->dsm);
47 	unsigned long page;
48 	u32 prng = 0x12345678;
49 
50 	/* XXX: fsck. needs some more thought... */
51 	if (!i915_ggtt_has_aperture(ggtt))
52 		return;
53 
54 	for (page = 0; page < size; page += PAGE_SIZE) {
55 		const dma_addr_t dma = i915->dsm.start + page;
56 		u32 __iomem *s;
57 		int x;
58 
59 		ggtt->vm.insert_page(&ggtt->vm, dma, slot, I915_CACHE_NONE, 0);
60 
61 		s = io_mapping_map_atomic_wc(&ggtt->iomap, slot);
62 		for (x = 0; x < PAGE_SIZE / sizeof(u32); x++) {
63 			prng = next_pseudo_random32(prng);
64 			iowrite32(prng, &s[x]);
65 		}
66 		io_mapping_unmap_atomic(s);
67 	}
68 
69 	ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
70 }
71 
72 static void simulate_hibernate(struct drm_i915_private *i915)
73 {
74 	intel_wakeref_t wakeref;
75 
76 	wakeref = intel_runtime_pm_get(&i915->runtime_pm);
77 
78 	/*
79 	 * As a final sting in the tail, invalidate stolen. Under a real S4,
80 	 * stolen is lost and needs to be refilled on resume. However, under
81 	 * CI we merely do S4-device testing (as full S4 is too unreliable
82 	 * for automated testing across a cluster), so to simulate the effect
83 	 * of stolen being trashed across S4, we trash it ourselves.
84 	 */
85 	trash_stolen(i915);
86 
87 	intel_runtime_pm_put(&i915->runtime_pm, wakeref);
88 }
89 
90 static int igt_pm_prepare(struct drm_i915_private *i915)
91 {
92 	i915_gem_suspend(i915);
93 
94 	return 0;
95 }
96 
97 static void igt_pm_suspend(struct drm_i915_private *i915)
98 {
99 	intel_wakeref_t wakeref;
100 
101 	with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
102 		i915_ggtt_suspend(&i915->ggtt);
103 		i915_gem_suspend_late(i915);
104 	}
105 }
106 
107 static void igt_pm_hibernate(struct drm_i915_private *i915)
108 {
109 	intel_wakeref_t wakeref;
110 
111 	with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
112 		i915_ggtt_suspend(&i915->ggtt);
113 
114 		i915_gem_freeze(i915);
115 		i915_gem_freeze_late(i915);
116 	}
117 }
118 
119 static void igt_pm_resume(struct drm_i915_private *i915)
120 {
121 	intel_wakeref_t wakeref;
122 
123 	/*
124 	 * Both suspend and hibernate follow the same wakeup path and assume
125 	 * that runtime-pm just works.
126 	 */
127 	with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
128 		i915_ggtt_resume(&i915->ggtt);
129 		i915_gem_resume(i915);
130 	}
131 }
132 
133 static int igt_gem_suspend(void *arg)
134 {
135 	struct drm_i915_private *i915 = arg;
136 	struct i915_gem_context *ctx;
137 	struct file *file;
138 	int err;
139 
140 	file = mock_file(i915);
141 	if (IS_ERR(file))
142 		return PTR_ERR(file);
143 
144 	err = -ENOMEM;
145 	ctx = live_context(i915, file);
146 	if (!IS_ERR(ctx))
147 		err = switch_to_context(ctx);
148 	if (err)
149 		goto out;
150 
151 	err = igt_pm_prepare(i915);
152 	if (err)
153 		goto out;
154 
155 	igt_pm_suspend(i915);
156 
157 	/* Here be dragons! Note that with S3RST any S3 may become S4! */
158 	simulate_hibernate(i915);
159 
160 	igt_pm_resume(i915);
161 
162 	err = switch_to_context(ctx);
163 out:
164 	fput(file);
165 	return err;
166 }
167 
168 static int igt_gem_hibernate(void *arg)
169 {
170 	struct drm_i915_private *i915 = arg;
171 	struct i915_gem_context *ctx;
172 	struct file *file;
173 	int err;
174 
175 	file = mock_file(i915);
176 	if (IS_ERR(file))
177 		return PTR_ERR(file);
178 
179 	err = -ENOMEM;
180 	ctx = live_context(i915, file);
181 	if (!IS_ERR(ctx))
182 		err = switch_to_context(ctx);
183 	if (err)
184 		goto out;
185 
186 	err = igt_pm_prepare(i915);
187 	if (err)
188 		goto out;
189 
190 	igt_pm_hibernate(i915);
191 
192 	/* Here be dragons! */
193 	simulate_hibernate(i915);
194 
195 	igt_pm_resume(i915);
196 
197 	err = switch_to_context(ctx);
198 out:
199 	fput(file);
200 	return err;
201 }
202 
203 static int igt_gem_ww_ctx(void *arg)
204 {
205 	struct drm_i915_private *i915 = arg;
206 	struct drm_i915_gem_object *obj, *obj2;
207 	struct i915_gem_ww_ctx ww;
208 	int err = 0;
209 
210 	obj = i915_gem_object_create_internal(i915, PAGE_SIZE);
211 	if (IS_ERR(obj))
212 		return PTR_ERR(obj);
213 
214 	obj2 = i915_gem_object_create_internal(i915, PAGE_SIZE);
215 	if (IS_ERR(obj2)) {
216 		err = PTR_ERR(obj2);
217 		goto put1;
218 	}
219 
220 	i915_gem_ww_ctx_init(&ww, true);
221 retry:
222 	/* Lock the objects, twice for good measure (-EALREADY handling) */
223 	err = i915_gem_object_lock(obj, &ww);
224 	if (!err)
225 		err = i915_gem_object_lock_interruptible(obj, &ww);
226 	if (!err)
227 		err = i915_gem_object_lock_interruptible(obj2, &ww);
228 	if (!err)
229 		err = i915_gem_object_lock(obj2, &ww);
230 
231 	if (err == -EDEADLK) {
232 		err = i915_gem_ww_ctx_backoff(&ww);
233 		if (!err)
234 			goto retry;
235 	}
236 	i915_gem_ww_ctx_fini(&ww);
237 	i915_gem_object_put(obj2);
238 put1:
239 	i915_gem_object_put(obj);
240 	return err;
241 }
242 
243 int i915_gem_live_selftests(struct drm_i915_private *i915)
244 {
245 	static const struct i915_subtest tests[] = {
246 		SUBTEST(igt_gem_suspend),
247 		SUBTEST(igt_gem_hibernate),
248 		SUBTEST(igt_gem_ww_ctx),
249 	};
250 
251 	if (intel_gt_is_wedged(&i915->gt))
252 		return 0;
253 
254 	return i915_live_subtests(tests, i915);
255 }
256