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

   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                 i915_gem_restore_gtt_mappings(i915);
 123                 i915_gem_restore_fences(i915);
 124
 125                 i915_gem_resume(i915);
 126         }
 127 }
 128
 129 static int igt_gem_suspend(void *arg)
 130 {
 131         struct drm_i915_private *i915 = arg;
 132         struct i915_gem_context *ctx;
 133         struct drm_file *file;
 134         int err;
 135
 136         file = mock_file(i915);
 137         if (IS_ERR(file))
 138                 return PTR_ERR(file);
 139
 140         err = -ENOMEM;
 141         mutex_lock(&i915->drm.struct_mutex);
 142         ctx = live_context(i915, file);
 143         if (!IS_ERR(ctx))
 144                 err = switch_to_context(i915, ctx);
 145         mutex_unlock(&i915->drm.struct_mutex);
 146         if (err)
 147                 goto out;
 148
 149         err = pm_prepare(i915);
 150         if (err)
 151                 goto out;
 152
 153         pm_suspend(i915);
 154
 155         /* Here be dragons! Note that with S3RST any S3 may become S4! */
 156         simulate_hibernate(i915);
 157
 158         pm_resume(i915);
 159
 160         mutex_lock(&i915->drm.struct_mutex);
 161         err = switch_to_context(i915, ctx);
 162         mutex_unlock(&i915->drm.struct_mutex);
 163 out:
 164         mock_file_free(i915, file);
 165         return err;
 166 }
 167
 168 static int igt_gem_hibernate(void *arg)
 169 {
 170         struct drm_i915_private *i915 = arg;
 171         struct i915_gem_context *ctx;
 172         struct drm_file *file;
 173         int err;
 174
 175         file = mock_file(i915);
 176         if (IS_ERR(file))
 177                 return PTR_ERR(file);
 178
 179         err = -ENOMEM;
 180         mutex_lock(&i915->drm.struct_mutex);
 181         ctx = live_context(i915, file);
 182         if (!IS_ERR(ctx))
 183                 err = switch_to_context(i915, ctx);
 184         mutex_unlock(&i915->drm.struct_mutex);
 185         if (err)
 186                 goto out;
 187
 188         err = pm_prepare(i915);
 189         if (err)
 190                 goto out;
 191
 192         pm_hibernate(i915);
 193
 194         /* Here be dragons! */
 195         simulate_hibernate(i915);
 196
 197         pm_resume(i915);
 198
 199         mutex_lock(&i915->drm.struct_mutex);
 200         err = switch_to_context(i915, ctx);
 201         mutex_unlock(&i915->drm.struct_mutex);
 202 out:
 203         mock_file_free(i915, file);
 204         return err;
 205 }
 206
 207 int i915_gem_live_selftests(struct drm_i915_private *i915)
 208 {
 209         static const struct i915_subtest tests[] = {
 210                 SUBTEST(igt_gem_suspend),
 211                 SUBTEST(igt_gem_hibernate),
 212         };
 213
 214         if (intel_gt_is_wedged(&i915->gt))
 215                 return 0;
 216
 217         return i915_live_subtests(tests, i915);
 218 }