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 pm_prepare(struct drm_i915_private *i915) 91 { 92 i915_gem_suspend(i915); 93 94 return 0; 95 } 96 97 static void 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 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 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 = pm_prepare(i915); 152 if (err) 153 goto out; 154 155 pm_suspend(i915); 156 157 /* Here be dragons! Note that with S3RST any S3 may become S4! */ 158 simulate_hibernate(i915); 159 160 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 = pm_prepare(i915); 187 if (err) 188 goto out; 189 190 pm_hibernate(i915); 191 192 /* Here be dragons! */ 193 simulate_hibernate(i915); 194 195 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