1 /* $NetBSD: i915_gem.c,v 1.2 2021/12/18 23:45:31 riastradh Exp $ */ 2 3 /* 4 * SPDX-License-Identifier: MIT 5 * 6 * Copyright 2018 Intel Corporation 7 */ 8 9 #include <sys/cdefs.h> 10 __KERNEL_RCSID(0, "$NetBSD: i915_gem.c,v 1.2 2021/12/18 23:45:31 riastradh Exp $"); 11 12 #include <linux/random.h> 13 14 #include "gem/selftests/igt_gem_utils.h" 15 #include "gem/selftests/mock_context.h" 16 #include "gt/intel_gt.h" 17 #include "gt/intel_gt_pm.h" 18 19 #include "i915_selftest.h" 20 21 #include "igt_flush_test.h" 22 #include "mock_drm.h" 23 24 static int switch_to_context(struct i915_gem_context *ctx) 25 { 26 struct i915_gem_engines_iter it; 27 struct intel_context *ce; 28 int err = 0; 29 30 for_each_gem_engine(ce, i915_gem_context_lock_engines(ctx), it) { 31 struct i915_request *rq; 32 33 rq = intel_context_create_request(ce); 34 if (IS_ERR(rq)) { 35 err = PTR_ERR(rq); 36 break; 37 } 38 39 i915_request_add(rq); 40 } 41 i915_gem_context_unlock_engines(ctx); 42 43 return err; 44 } 45 46 static void trash_stolen(struct drm_i915_private *i915) 47 { 48 struct i915_ggtt *ggtt = &i915->ggtt; 49 const u64 slot = ggtt->error_capture.start; 50 const resource_size_t size = resource_size(&i915->dsm); 51 unsigned long page; 52 u32 prng = 0x12345678; 53 54 /* XXX: fsck. needs some more thought... */ 55 if (!i915_ggtt_has_aperture(ggtt)) 56 return; 57 58 for (page = 0; page < size; page += PAGE_SIZE) { 59 const dma_addr_t dma = i915->dsm.start + page; 60 u32 __iomem *s; 61 int x; 62 63 ggtt->vm.insert_page(&ggtt->vm, dma, slot, I915_CACHE_NONE, 0); 64 65 s = io_mapping_map_atomic_wc(&ggtt->iomap, slot); 66 for (x = 0; x < PAGE_SIZE / sizeof(u32); x++) { 67 prng = next_pseudo_random32(prng); 68 iowrite32(prng, &s[x]); 69 } 70 io_mapping_unmap_atomic(s); 71 } 72 73 ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE); 74 } 75 76 static void simulate_hibernate(struct drm_i915_private *i915) 77 { 78 intel_wakeref_t wakeref; 79 80 wakeref = intel_runtime_pm_get(&i915->runtime_pm); 81 82 /* 83 * As a final sting in the tail, invalidate stolen. Under a real S4, 84 * stolen is lost and needs to be refilled on resume. However, under 85 * CI we merely do S4-device testing (as full S4 is too unreliable 86 * for automated testing across a cluster), so to simulate the effect 87 * of stolen being trashed across S4, we trash it ourselves. 88 */ 89 trash_stolen(i915); 90 91 intel_runtime_pm_put(&i915->runtime_pm, wakeref); 92 } 93 94 static int pm_prepare(struct drm_i915_private *i915) 95 { 96 i915_gem_suspend(i915); 97 98 return 0; 99 } 100 101 static void pm_suspend(struct drm_i915_private *i915) 102 { 103 intel_wakeref_t wakeref; 104 105 with_intel_runtime_pm(&i915->runtime_pm, wakeref) { 106 i915_gem_suspend_gtt_mappings(i915); 107 i915_gem_suspend_late(i915); 108 } 109 } 110 111 static void pm_hibernate(struct drm_i915_private *i915) 112 { 113 intel_wakeref_t wakeref; 114 115 with_intel_runtime_pm(&i915->runtime_pm, wakeref) { 116 i915_gem_suspend_gtt_mappings(i915); 117 118 i915_gem_freeze(i915); 119 i915_gem_freeze_late(i915); 120 } 121 } 122 123 static void pm_resume(struct drm_i915_private *i915) 124 { 125 intel_wakeref_t wakeref; 126 127 /* 128 * Both suspend and hibernate follow the same wakeup path and assume 129 * that runtime-pm just works. 130 */ 131 with_intel_runtime_pm(&i915->runtime_pm, wakeref) { 132 i915_gem_restore_gtt_mappings(i915); 133 i915_gem_restore_fences(&i915->ggtt); 134 135 i915_gem_resume(i915); 136 } 137 } 138 139 static int igt_gem_suspend(void *arg) 140 { 141 struct drm_i915_private *i915 = arg; 142 struct i915_gem_context *ctx; 143 struct file *file; 144 int err; 145 146 file = mock_file(i915); 147 if (IS_ERR(file)) 148 return PTR_ERR(file); 149 150 err = -ENOMEM; 151 ctx = live_context(i915, file); 152 if (!IS_ERR(ctx)) 153 err = switch_to_context(ctx); 154 if (err) 155 goto out; 156 157 err = pm_prepare(i915); 158 if (err) 159 goto out; 160 161 pm_suspend(i915); 162 163 /* Here be dragons! Note that with S3RST any S3 may become S4! */ 164 simulate_hibernate(i915); 165 166 pm_resume(i915); 167 168 err = switch_to_context(ctx); 169 out: 170 fput(file); 171 return err; 172 } 173 174 static int igt_gem_hibernate(void *arg) 175 { 176 struct drm_i915_private *i915 = arg; 177 struct i915_gem_context *ctx; 178 struct file *file; 179 int err; 180 181 file = mock_file(i915); 182 if (IS_ERR(file)) 183 return PTR_ERR(file); 184 185 err = -ENOMEM; 186 ctx = live_context(i915, file); 187 if (!IS_ERR(ctx)) 188 err = switch_to_context(ctx); 189 if (err) 190 goto out; 191 192 err = pm_prepare(i915); 193 if (err) 194 goto out; 195 196 pm_hibernate(i915); 197 198 /* Here be dragons! */ 199 simulate_hibernate(i915); 200 201 pm_resume(i915); 202 203 err = switch_to_context(ctx); 204 out: 205 fput(file); 206 return err; 207 } 208 209 int i915_gem_live_selftests(struct drm_i915_private *i915) 210 { 211 static const struct i915_subtest tests[] = { 212 SUBTEST(igt_gem_suspend), 213 SUBTEST(igt_gem_hibernate), 214 }; 215 216 if (intel_gt_is_wedged(&i915->gt)) 217 return 0; 218 219 return i915_live_subtests(tests, i915); 220 } 221