drivers/gpu/drm/i915/selftests/i915_active.c

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright © 2018 Intel Corporation
   5  */
   6
   7 #include <linux/kref.h>
   8
   9 #include "gem/i915_gem_pm.h"
  10 #include "gt/intel_gt.h"
  11
  12 #include "i915_selftest.h"
  13
  14 #include "igt_flush_test.h"
  15 #include "lib_sw_fence.h"
  16
  17 struct live_active {
  18         struct i915_active base;
  19         struct kref ref;
  20         bool retired;
  21 };
  22
  23 static void __live_get(struct live_active *active)
  24 {
  25         kref_get(&active->ref);
  26 }
  27
  28 static void __live_free(struct live_active *active)
  29 {
  30         i915_active_fini(&active->base);
  31         kfree(active);
  32 }
  33
  34 static void __live_release(struct kref *ref)
  35 {
  36         struct live_active *active = container_of(ref, typeof(*active), ref);
  37
  38         __live_free(active);
  39 }
  40
  41 static void __live_put(struct live_active *active)
  42 {
  43         kref_put(&active->ref, __live_release);
  44 }
  45
  46 static int __live_active(struct i915_active *base)
  47 {
  48         struct live_active *active = container_of(base, typeof(*active), base);
  49
  50         __live_get(active);
  51         return 0;
  52 }
  53
  54 static void __live_retire(struct i915_active *base)
  55 {
  56         struct live_active *active = container_of(base, typeof(*active), base);
  57
  58         active->retired = true;
  59         __live_put(active);
  60 }
  61
  62 static struct live_active *__live_alloc(struct drm_i915_private *i915)
  63 {
  64         struct live_active *active;
  65
  66         active = kzalloc(sizeof(*active), GFP_KERNEL);
  67         if (!active)
  68                 return NULL;
  69
  70         kref_init(&active->ref);
  71         i915_active_init(&active->base, __live_active, __live_retire);
  72
  73         return active;
  74 }
  75
  76 static struct live_active *
  77 __live_active_setup(struct drm_i915_private *i915)
  78 {
  79         struct intel_engine_cs *engine;
  80         struct i915_sw_fence *submit;
  81         struct live_active *active;
  82         unsigned int count = 0;
  83         int err = 0;
  84
  85         active = __live_alloc(i915);
  86         if (!active)
  87                 return ERR_PTR(-ENOMEM);
  88
  89         submit = heap_fence_create(GFP_KERNEL);
  90         if (!submit) {
  91                 kfree(active);
  92                 return ERR_PTR(-ENOMEM);
  93         }
  94
  95         err = i915_active_acquire(&active->base);
  96         if (err)
  97                 goto out;
  98
  99         for_each_uabi_engine(engine, i915) {
 100                 struct i915_request *rq;
 101
 102                 rq = intel_engine_create_kernel_request(engine);
 103                 if (IS_ERR(rq)) {
 104                         err = PTR_ERR(rq);
 105                         break;
 106                 }
 107
 108                 err = i915_sw_fence_await_sw_fence_gfp(&rq->submit,
 109                                                        submit,
 110                                                        GFP_KERNEL);
 111                 if (err >= 0)
 112                         err = i915_active_add_request(&active->base, rq);
 113                 i915_request_add(rq);
 114                 if (err) {
 115                         pr_err("Failed to track active ref!\n");
 116                         break;
 117                 }
 118
 119                 count++;
 120         }
 121
 122         i915_active_release(&active->base);
 123         if (READ_ONCE(active->retired) && count) {
 124                 pr_err("i915_active retired before submission!\n");
 125                 err = -EINVAL;
 126         }
 127         if (atomic_read(&active->base.count) != count) {
 128                 pr_err("i915_active not tracking all requests, found %d, expected %d\n",
 129                        atomic_read(&active->base.count), count);
 130                 err = -EINVAL;
 131         }
 132
 133 out:
 134         i915_sw_fence_commit(submit);
 135         heap_fence_put(submit);
 136         if (err) {
 137                 __live_put(active);
 138                 active = ERR_PTR(err);
 139         }
 140
 141         return active;
 142 }
 143
 144 static int live_active_wait(void *arg)
 145 {
 146         struct drm_i915_private *i915 = arg;
 147         struct live_active *active;
 148         int err = 0;
 149
 150         /* Check that we get a callback when requests retire upon waiting */
 151
 152         active = __live_active_setup(i915);
 153         if (IS_ERR(active))
 154                 return PTR_ERR(active);
 155
 156         i915_active_wait(&active->base);
 157         if (!READ_ONCE(active->retired)) {
 158                 struct drm_printer p = drm_err_printer(__func__);
 159
 160                 pr_err("i915_active not retired after waiting!\n");
 161                 i915_active_print(&active->base, &p);
 162
 163                 err = -EINVAL;
 164         }
 165
 166         __live_put(active);
 167
 168         if (igt_flush_test(i915))
 169                 err = -EIO;
 170
 171         return err;
 172 }
 173
 174 static int live_active_retire(void *arg)
 175 {
 176         struct drm_i915_private *i915 = arg;
 177         struct live_active *active;
 178         int err = 0;
 179
 180         /* Check that we get a callback when requests are indirectly retired */
 181
 182         active = __live_active_setup(i915);
 183         if (IS_ERR(active))
 184                 return PTR_ERR(active);
 185
 186         /* waits for & retires all requests */
 187         if (igt_flush_test(i915))
 188                 err = -EIO;
 189
 190         if (!READ_ONCE(active->retired)) {
 191                 struct drm_printer p = drm_err_printer(__func__);
 192
 193                 pr_err("i915_active not retired after flushing!\n");
 194                 i915_active_print(&active->base, &p);
 195
 196                 err = -EINVAL;
 197         }
 198
 199         __live_put(active);
 200
 201         return err;
 202 }
 203
 204 int i915_active_live_selftests(struct drm_i915_private *i915)
 205 {
 206         static const struct i915_subtest tests[] = {
 207                 SUBTEST(live_active_wait),
 208                 SUBTEST(live_active_retire),
 209         };
 210
 211         if (intel_gt_is_wedged(&i915->gt))
 212                 return 0;
 213
 214         return i915_subtests(tests, i915);
 215 }
 216
 217 static struct intel_engine_cs *node_to_barrier(struct active_node *it)
 218 {
 219         struct intel_engine_cs *engine;
 220
 221         if (!is_barrier(&it->base))
 222                 return NULL;
 223
 224         engine = __barrier_to_engine(it);
 225         smp_rmb(); /* serialise with add_active_barriers */
 226         if (!is_barrier(&it->base))
 227                 return NULL;
 228
 229         return engine;
 230 }
 231
 232 void i915_active_print(struct i915_active *ref, struct drm_printer *m)
 233 {
 234         drm_printf(m, "active %pS:%pS\n", ref->active, ref->retire);
 235         drm_printf(m, "\tcount: %d\n", atomic_read(&ref->count));
 236         drm_printf(m, "\tpreallocated barriers? %s\n",
 237                    yesno(!llist_empty(&ref->preallocated_barriers)));
 238
 239         if (i915_active_acquire_if_busy(ref)) {
 240                 struct active_node *it, *n;
 241
 242                 rbtree_postorder_for_each_entry_safe(it, n, &ref->tree, node) {
 243                         struct intel_engine_cs *engine;
 244
 245                         engine = node_to_barrier(it);
 246                         if (engine) {
 247                                 drm_printf(m, "\tbarrier: %s\n", engine->name);
 248                                 continue;
 249                         }
 250
 251                         if (i915_active_fence_isset(&it->base)) {
 252                                 drm_printf(m,
 253                                            "\ttimeline: %llx\n", it->timeline);
 254                                 continue;
 255                         }
 256                 }
 257
 258                 i915_active_release(ref);
 259         }
 260 }
 261
 262 static void spin_unlock_wait(spinlock_t *lock)
 263 {
 264         spin_lock_irq(lock);
 265         spin_unlock_irq(lock);
 266 }
 267
 268 void i915_active_unlock_wait(struct i915_active *ref)
 269 {
 270         if (i915_active_acquire_if_busy(ref)) {
 271                 struct active_node *it, *n;
 272
 273                 rcu_read_lock();
 274                 rbtree_postorder_for_each_entry_safe(it, n, &ref->tree, node) {
 275                         struct dma_fence *f;
 276
 277                         /* Wait for all active callbacks */
 278                         f = rcu_dereference(it->base.fence);
 279                         if (f)
 280                                 spin_unlock_wait(f->lock);
 281                 }
 282                 rcu_read_unlock();
 283
 284                 i915_active_release(ref);
 285         }
 286
 287         /* And wait for the retire callback */
 288         spin_lock_irq(&ref->tree_lock);
 289         spin_unlock_irq(&ref->tree_lock);
 290
 291         /* ... which may have been on a thread instead */
 292         flush_work(&ref->work);
 293 }