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 "gt/intel_gt.h" 12 #include "gt/intel_gt_pm.h" 13 14 #include "i915_selftest.h" 15 16 #include "igt_flush_test.h" 17 #include "mock_drm.h" 18 19 static int switch_to_context(struct i915_gem_context *ctx) 20 { 21 struct i915_gem_engines_iter it; 22 struct intel_context *ce; 23 int err = 0; 24 25 for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it) { 26 struct i915_request *rq; 27 28 rq = intel_context_create_request(ce); 29 if (IS_ERR(rq)) { 30 err = PTR_ERR(rq); 31 break; 32 } 33 34 i915_request_add(rq); 35 } 36 i915_gem_context_unlock_engines(ctx); 37 38 return err; 39 } 40 41 static void trash_stolen(struct drm_i915_private *i915) 42 { 43 struct i915_ggtt *ggtt = &i915->ggtt; 44 const u64 slot = ggtt->error_capture.start; 45 const resource_size_t size = resource_size(&i915->dsm); 46 unsigned long page; 47 u32 prng = 0x12345678; 48 49 /* XXX: fsck. needs some more thought... */ 50 if (!i915_ggtt_has_aperture(ggtt)) 51 return; 52 53 for (page = 0; page < size; page += PAGE_SIZE) { 54 const dma_addr_t dma = i915->dsm.start + page; 55 u32 __iomem *s; 56 int x; 57 58 ggtt->vm.insert_page(&ggtt->vm, dma, slot, I915_CACHE_NONE, 0); 59 60 s = io_mapping_map_atomic_wc(&ggtt->iomap, slot); 61 for (x = 0; x < PAGE_SIZE / sizeof(u32); x++) { 62 prng = next_pseudo_random32(prng); 63 iowrite32(prng, &s[x]); 64 } 65 io_mapping_unmap_atomic(s); 66 } 67 68 ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE); 69 } 70 71 static void simulate_hibernate(struct drm_i915_private *i915) 72 { 73 intel_wakeref_t wakeref; 74 75 wakeref = intel_runtime_pm_get(&i915->runtime_pm); 76 77 /* 78 * As a final sting in the tail, invalidate stolen. Under a real S4, 79 * stolen is lost and needs to be refilled on resume. However, under 80 * CI we merely do S4-device testing (as full S4 is too unreliable 81 * for automated testing across a cluster), so to simulate the effect 82 * of stolen being trashed across S4, we trash it ourselves. 83 */ 84 trash_stolen(i915); 85 86 intel_runtime_pm_put(&i915->runtime_pm, wakeref); 87 } 88 89 static int pm_prepare(struct drm_i915_private *i915) 90 { 91 i915_gem_suspend(i915); 92 93 return 0; 94 } 95 96 static void pm_suspend(struct drm_i915_private *i915) 97 { 98 intel_wakeref_t wakeref; 99 100 with_intel_runtime_pm(&i915->runtime_pm, wakeref) { 101 i915_gem_suspend_gtt_mappings(i915); 102 i915_gem_suspend_late(i915); 103 } 104 } 105 106 static void pm_hibernate(struct drm_i915_private *i915) 107 { 108 intel_wakeref_t wakeref; 109 110 with_intel_runtime_pm(&i915->runtime_pm, wakeref) { 111 i915_gem_suspend_gtt_mappings(i915); 112 113 i915_gem_freeze(i915); 114 i915_gem_freeze_late(i915); 115 } 116 } 117 118 static void pm_resume(struct drm_i915_private *i915) 119 { 120 intel_wakeref_t wakeref; 121 122 /* 123 * Both suspend and hibernate follow the same wakeup path and assume 124 * that runtime-pm just works. 125 */ 126 with_intel_runtime_pm(&i915->runtime_pm, wakeref) { 127 i915_gem_restore_gtt_mappings(i915); 128 i915_gem_restore_fences(&i915->ggtt); 129 130 i915_gem_resume(i915); 131 } 132 } 133 134 static int igt_gem_suspend(void *arg) 135 { 136 struct drm_i915_private *i915 = arg; 137 struct i915_gem_context *ctx; 138 struct file *file; 139 int err; 140 141 file = mock_file(i915); 142 if (IS_ERR(file)) 143 return PTR_ERR(file); 144 145 err = -ENOMEM; 146 ctx = live_context(i915, file); 147 if (!IS_ERR(ctx)) 148 err = switch_to_context(ctx); 149 if (err) 150 goto out; 151 152 err = pm_prepare(i915); 153 if (err) 154 goto out; 155 156 pm_suspend(i915); 157 158 /* Here be dragons! Note that with S3RST any S3 may become S4! */ 159 simulate_hibernate(i915); 160 161 pm_resume(i915); 162 163 err = switch_to_context(ctx); 164 out: 165 fput(file); 166 return err; 167 } 168 169 static int igt_gem_hibernate(void *arg) 170 { 171 struct drm_i915_private *i915 = arg; 172 struct i915_gem_context *ctx; 173 struct file *file; 174 int err; 175 176 file = mock_file(i915); 177 if (IS_ERR(file)) 178 return PTR_ERR(file); 179 180 err = -ENOMEM; 181 ctx = live_context(i915, file); 182 if (!IS_ERR(ctx)) 183 err = switch_to_context(ctx); 184 if (err) 185 goto out; 186 187 err = pm_prepare(i915); 188 if (err) 189 goto out; 190 191 pm_hibernate(i915); 192 193 /* Here be dragons! */ 194 simulate_hibernate(i915); 195 196 pm_resume(i915); 197 198 err = switch_to_context(ctx); 199 out: 200 fput(file); 201 return err; 202 } 203 204 int i915_gem_live_selftests(struct drm_i915_private *i915) 205 { 206 static const struct i915_subtest tests[] = { 207 SUBTEST(igt_gem_suspend), 208 SUBTEST(igt_gem_hibernate), 209 }; 210 211 if (intel_gt_is_wedged(&i915->gt)) 212 return 0; 213 214 return i915_live_subtests(tests, i915); 215 } 216