root/drivers/gpu/drm/i915/selftests/i915_gem.c

DEFINITIONS

1. switch_to_context
2. trash_stolen
3. simulate_hibernate
4. pm_prepare
5. pm_suspend
6. pm_hibernate
7. pm_resume
8. igt_gem_suspend
9. igt_gem_hibernate
10. i915_gem_live_selftests

   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 
  13 #include "i915_selftest.h"
  14 
  15 #include "igt_flush_test.h"
  16 #include "mock_drm.h"
  17 
  18 static int switch_to_context(struct drm_i915_private *i915,
  19                              struct i915_gem_context *ctx)
  20 {
  21         struct intel_engine_cs *engine;
  22         enum intel_engine_id id;
  23 
  24         for_each_engine(engine, i915, id) {
  25                 struct i915_request *rq;
  26 
  27                 rq = igt_request_alloc(ctx, engine);
  28                 if (IS_ERR(rq))
  29                         return PTR_ERR(rq);
  30 
  31                 i915_request_add(rq);
  32         }
  33 
  34         return 0;
  35 }
  36 
  37 static void trash_stolen(struct drm_i915_private *i915)
  38 {
  39         struct i915_ggtt *ggtt = &i915->ggtt;
  40         const u64 slot = ggtt->error_capture.start;
  41         const resource_size_t size = resource_size(&i915->dsm);
  42         unsigned long page;
  43         u32 prng = 0x12345678;
  44 
  45         for (page = 0; page < size; page += PAGE_SIZE) {
  46                 const dma_addr_t dma = i915->dsm.start + page;
  47                 u32 __iomem *s;
  48                 int x;
  49 
  50                 ggtt->vm.insert_page(&ggtt->vm, dma, slot, I915_CACHE_NONE, 0);
  51 
  52                 s = io_mapping_map_atomic_wc(&ggtt->iomap, slot);
  53                 for (x = 0; x < PAGE_SIZE / sizeof(u32); x++) {
  54                         prng = next_pseudo_random32(prng);
  55                         iowrite32(prng, &s[x]);
  56                 }
  57                 io_mapping_unmap_atomic(s);
  58         }
  59 
  60         ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
  61 }
  62 
  63 static void simulate_hibernate(struct drm_i915_private *i915)
  64 {
  65         intel_wakeref_t wakeref;
  66 
  67         wakeref = intel_runtime_pm_get(&i915->runtime_pm);
  68 
  69         /*
  70          * As a final sting in the tail, invalidate stolen. Under a real S4,
  71          * stolen is lost and needs to be refilled on resume. However, under
  72          * CI we merely do S4-device testing (as full S4 is too unreliable
  73          * for automated testing across a cluster), so to simulate the effect
  74          * of stolen being trashed across S4, we trash it ourselves.
  75          */
  76         trash_stolen(i915);
  77 
  78         intel_runtime_pm_put(&i915->runtime_pm, wakeref);
  79 }
  80 
  81 static int pm_prepare(struct drm_i915_private *i915)
  82 {
  83         i915_gem_suspend(i915);
  84 
  85         return 0;
  86 }
  87 
  88 static void pm_suspend(struct drm_i915_private *i915)
  89 {
  90         intel_wakeref_t wakeref;
  91 
  92         with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
  93                 i915_gem_suspend_gtt_mappings(i915);
  94                 i915_gem_suspend_late(i915);
  95         }
  96 }
  97 
  98 static void pm_hibernate(struct drm_i915_private *i915)
  99 {
 100         intel_wakeref_t wakeref;
 101 
 102         with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
 103                 i915_gem_suspend_gtt_mappings(i915);
 104 
 105                 i915_gem_freeze(i915);
 106                 i915_gem_freeze_late(i915);
 107         }
 108 }
 109 
 110 static void pm_resume(struct drm_i915_private *i915)
 111 {
 112         intel_wakeref_t wakeref;
 113 
 114         /*
 115          * Both suspend and hibernate follow the same wakeup path and assume
 116          * that runtime-pm just works.
 117          */
 118         with_intel_runtime_pm(&i915->runtime_pm, wakeref) {
 119                 intel_gt_sanitize(&i915->gt, false);
 120                 i915_gem_sanitize(i915);
 121 
 122                 mutex_lock(&i915->drm.struct_mutex);
 123                 i915_gem_restore_gtt_mappings(i915);
 124                 i915_gem_restore_fences(i915);
 125                 mutex_unlock(&i915->drm.struct_mutex);
 126 
 127                 i915_gem_resume(i915);
 128         }
 129 }
 130 
 131 static int igt_gem_suspend(void *arg)
 132 {
 133         struct drm_i915_private *i915 = arg;
 134         struct i915_gem_context *ctx;
 135         struct drm_file *file;
 136         int err;
 137 
 138         file = mock_file(i915);
 139         if (IS_ERR(file))
 140                 return PTR_ERR(file);
 141 
 142         err = -ENOMEM;
 143         mutex_lock(&i915->drm.struct_mutex);
 144         ctx = live_context(i915, file);
 145         if (!IS_ERR(ctx))
 146                 err = switch_to_context(i915, ctx);
 147         mutex_unlock(&i915->drm.struct_mutex);
 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         mutex_lock(&i915->drm.struct_mutex);
 163         err = switch_to_context(i915, ctx);
 164         mutex_unlock(&i915->drm.struct_mutex);
 165 out:
 166         mock_file_free(i915, file);
 167         return err;
 168 }
 169 
 170 static int igt_gem_hibernate(void *arg)
 171 {
 172         struct drm_i915_private *i915 = arg;
 173         struct i915_gem_context *ctx;
 174         struct drm_file *file;
 175         int err;
 176 
 177         file = mock_file(i915);
 178         if (IS_ERR(file))
 179                 return PTR_ERR(file);
 180 
 181         err = -ENOMEM;
 182         mutex_lock(&i915->drm.struct_mutex);
 183         ctx = live_context(i915, file);
 184         if (!IS_ERR(ctx))
 185                 err = switch_to_context(i915, ctx);
 186         mutex_unlock(&i915->drm.struct_mutex);
 187         if (err)
 188                 goto out;
 189 
 190         err = pm_prepare(i915);
 191         if (err)
 192                 goto out;
 193 
 194         pm_hibernate(i915);
 195 
 196         /* Here be dragons! */
 197         simulate_hibernate(i915);
 198 
 199         pm_resume(i915);
 200 
 201         mutex_lock(&i915->drm.struct_mutex);
 202         err = switch_to_context(i915, ctx);
 203         mutex_unlock(&i915->drm.struct_mutex);
 204 out:
 205         mock_file_free(i915, 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 }