1 /* 2 * SPDX-License-Identifier: MIT 3 * 4 * Copyright © 2018 Intel Corporation 5 */ 6 7 #include <linux/random.h> 8 9 #include "gem/i915_gem_internal.h" 10 #include "gem/i915_gem_pm.h" 11 #include "gem/selftests/igt_gem_utils.h" 12 #include "gem/selftests/mock_context.h" 13 #include "gt/intel_gt.h" 14 #include "gt/intel_gt_pm.h" 15 16 #include "i915_selftest.h" 17 18 #include "igt_flush_test.h" 19 #include "mock_drm.h" 20 21 static int switch_to_context(struct i915_gem_context *ctx) 22 { 23 struct i915_gem_engines_iter it; 24 struct intel_context *ce; 25 int err = 0; 26 27 for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it) { 28 struct i915_request *rq; 29 30 rq = intel_context_create_request(ce); 31 if (IS_ERR(rq)) { 32 err = PTR_ERR(rq); 33 break; 34 } 35 36 i915_request_add(rq); 37 } 38 i915_gem_context_unlock_engines(ctx); 39 40 return err; 41 } 42 43 static void trash_stolen(struct drm_i915_private *i915) 44 { 45 struct i915_ggtt *ggtt = to_gt(i915)->ggtt; 46 const u64 slot = ggtt->error_capture.start; 47 const resource_size_t size = resource_size(&i915->dsm.stolen); 48 unsigned long page; 49 u32 prng = 0x12345678; 50 51 /* XXX: fsck. needs some more thought... */ 52 if (!i915_ggtt_has_aperture(ggtt)) 53 return; 54 55 for (page = 0; page < size; page += PAGE_SIZE) { 56 const dma_addr_t dma = i915->dsm.stolen.start + page; 57 u32 __iomem *s; 58 int x; 59 60 ggtt->vm.insert_page(&ggtt->vm, dma, slot, I915_CACHE_NONE, 0); 61 62 s = io_mapping_map_atomic_wc(&ggtt->iomap, slot); 63 for (x = 0; x < PAGE_SIZE / sizeof(u32); x++) { 64 prng = next_pseudo_random32(prng); 65 iowrite32(prng, &s[x]); 66 } 67 io_mapping_unmap_atomic(s); 68 } 69 70 ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE); 71 } 72 73 static void simulate_hibernate(struct drm_i915_private *i915) 74 { 75 intel_wakeref_t wakeref; 76 77 wakeref = intel_runtime_pm_get(&i915->runtime_pm); 78 79 /* 80 * As a final sting in the tail, invalidate stolen. Under a real S4, 81 * stolen is lost and needs to be refilled on resume. However, under 82 * CI we merely do S4-device testing (as full S4 is too unreliable 83 * for automated testing across a cluster), so to simulate the effect 84 * of stolen being trashed across S4, we trash it ourselves. 85 */ 86 trash_stolen(i915); 87 88 intel_runtime_pm_put(&i915->runtime_pm, wakeref); 89 } 90 91 static int igt_pm_prepare(struct drm_i915_private *i915) 92 { 93 i915_gem_suspend(i915); 94 95 return 0; 96 } 97 98 static void igt_pm_suspend(struct drm_i915_private *i915) 99 { 100 intel_wakeref_t wakeref; 101 102 with_intel_runtime_pm(&i915->runtime_pm, wakeref) { 103 i915_ggtt_suspend(to_gt(i915)->ggtt); 104 i915_gem_suspend_late(i915); 105 } 106 } 107 108 static void igt_pm_hibernate(struct drm_i915_private *i915) 109 { 110 intel_wakeref_t wakeref; 111 112 with_intel_runtime_pm(&i915->runtime_pm, wakeref) { 113 i915_ggtt_suspend(to_gt(i915)->ggtt); 114 115 i915_gem_freeze(i915); 116 i915_gem_freeze_late(i915); 117 } 118 } 119 120 static void igt_pm_resume(struct drm_i915_private *i915) 121 { 122 intel_wakeref_t wakeref; 123 124 /* 125 * Both suspend and hibernate follow the same wakeup path and assume 126 * that runtime-pm just works. 127 */ 128 with_intel_runtime_pm(&i915->runtime_pm, wakeref) { 129 i915_ggtt_resume(to_gt(i915)->ggtt); 130 if (GRAPHICS_VER(i915) >= 8) 131 setup_private_pat(to_gt(i915)); 132 i915_gem_resume(i915); 133 } 134 } 135 136 static int igt_gem_suspend(void *arg) 137 { 138 struct drm_i915_private *i915 = arg; 139 struct i915_gem_context *ctx; 140 struct file *file; 141 int err; 142 143 file = mock_file(i915); 144 if (IS_ERR(file)) 145 return PTR_ERR(file); 146 147 err = -ENOMEM; 148 ctx = live_context(i915, file); 149 if (!IS_ERR(ctx)) 150 err = switch_to_context(ctx); 151 if (err) 152 goto out; 153 154 err = igt_pm_prepare(i915); 155 if (err) 156 goto out; 157 158 igt_pm_suspend(i915); 159 160 /* Here be dragons! Note that with S3RST any S3 may become S4! */ 161 simulate_hibernate(i915); 162 163 igt_pm_resume(i915); 164 165 err = switch_to_context(ctx); 166 out: 167 fput(file); 168 return err; 169 } 170 171 static int igt_gem_hibernate(void *arg) 172 { 173 struct drm_i915_private *i915 = arg; 174 struct i915_gem_context *ctx; 175 struct file *file; 176 int err; 177 178 file = mock_file(i915); 179 if (IS_ERR(file)) 180 return PTR_ERR(file); 181 182 err = -ENOMEM; 183 ctx = live_context(i915, file); 184 if (!IS_ERR(ctx)) 185 err = switch_to_context(ctx); 186 if (err) 187 goto out; 188 189 err = igt_pm_prepare(i915); 190 if (err) 191 goto out; 192 193 igt_pm_hibernate(i915); 194 195 /* Here be dragons! */ 196 simulate_hibernate(i915); 197 198 igt_pm_resume(i915); 199 200 err = switch_to_context(ctx); 201 out: 202 fput(file); 203 return err; 204 } 205 206 static int igt_gem_ww_ctx(void *arg) 207 { 208 struct drm_i915_private *i915 = arg; 209 struct drm_i915_gem_object *obj, *obj2; 210 struct i915_gem_ww_ctx ww; 211 int err = 0; 212 213 obj = i915_gem_object_create_internal(i915, PAGE_SIZE); 214 if (IS_ERR(obj)) 215 return PTR_ERR(obj); 216 217 obj2 = i915_gem_object_create_internal(i915, PAGE_SIZE); 218 if (IS_ERR(obj2)) { 219 err = PTR_ERR(obj2); 220 goto put1; 221 } 222 223 i915_gem_ww_ctx_init(&ww, true); 224 retry: 225 /* Lock the objects, twice for good measure (-EALREADY handling) */ 226 err = i915_gem_object_lock(obj, &ww); 227 if (!err) 228 err = i915_gem_object_lock_interruptible(obj, &ww); 229 if (!err) 230 err = i915_gem_object_lock_interruptible(obj2, &ww); 231 if (!err) 232 err = i915_gem_object_lock(obj2, &ww); 233 234 if (err == -EDEADLK) { 235 err = i915_gem_ww_ctx_backoff(&ww); 236 if (!err) 237 goto retry; 238 } 239 i915_gem_ww_ctx_fini(&ww); 240 i915_gem_object_put(obj2); 241 put1: 242 i915_gem_object_put(obj); 243 return err; 244 } 245 246 int i915_gem_live_selftests(struct drm_i915_private *i915) 247 { 248 static const struct i915_subtest tests[] = { 249 SUBTEST(igt_gem_suspend), 250 SUBTEST(igt_gem_hibernate), 251 SUBTEST(igt_gem_ww_ctx), 252 }; 253 254 if (intel_gt_is_wedged(to_gt(i915))) 255 return 0; 256 257 return i915_live_subtests(tests, i915); 258 } 259