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_ggtt_suspend(&i915->ggtt); 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_ggtt_suspend(&i915->ggtt); 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_ggtt_resume(&i915->ggtt); 128 i915_gem_resume(i915); 129 } 130 } 131 132 static int igt_gem_suspend(void *arg) 133 { 134 struct drm_i915_private *i915 = arg; 135 struct i915_gem_context *ctx; 136 struct file *file; 137 int err; 138 139 file = mock_file(i915); 140 if (IS_ERR(file)) 141 return PTR_ERR(file); 142 143 err = -ENOMEM; 144 ctx = live_context(i915, file); 145 if (!IS_ERR(ctx)) 146 err = switch_to_context(ctx); 147 if (err) 148 goto out; 149 150 err = pm_prepare(i915); 151 if (err) 152 goto out; 153 154 pm_suspend(i915); 155 156 /* Here be dragons! Note that with S3RST any S3 may become S4! */ 157 simulate_hibernate(i915); 158 159 pm_resume(i915); 160 161 err = switch_to_context(ctx); 162 out: 163 fput(file); 164 return err; 165 } 166 167 static int igt_gem_hibernate(void *arg) 168 { 169 struct drm_i915_private *i915 = arg; 170 struct i915_gem_context *ctx; 171 struct file *file; 172 int err; 173 174 file = mock_file(i915); 175 if (IS_ERR(file)) 176 return PTR_ERR(file); 177 178 err = -ENOMEM; 179 ctx = live_context(i915, file); 180 if (!IS_ERR(ctx)) 181 err = switch_to_context(ctx); 182 if (err) 183 goto out; 184 185 err = pm_prepare(i915); 186 if (err) 187 goto out; 188 189 pm_hibernate(i915); 190 191 /* Here be dragons! */ 192 simulate_hibernate(i915); 193 194 pm_resume(i915); 195 196 err = switch_to_context(ctx); 197 out: 198 fput(file); 199 return err; 200 } 201 202 int i915_gem_live_selftests(struct drm_i915_private *i915) 203 { 204 static const struct i915_subtest tests[] = { 205 SUBTEST(igt_gem_suspend), 206 SUBTEST(igt_gem_hibernate), 207 }; 208 209 if (intel_gt_is_wedged(&i915->gt)) 210 return 0; 211 212 return i915_live_subtests(tests, i915); 213 } 214