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

   1 /*
   2  * Copyright © 2017 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  */
  24
  25 #include "../i915_selftest.h"
  26
  27 /* max doorbell number + negative test for each client type */
  28 #define ATTEMPTS (GUC_NUM_DOORBELLS + GUC_CLIENT_PRIORITY_NUM)
  29
  30 static struct intel_guc_client *clients[ATTEMPTS];
  31
  32 static bool available_dbs(struct intel_guc *guc, u32 priority)
  33 {
  34         unsigned long offset;
  35         unsigned long end;
  36         u16 id;
  37
  38         /* first half is used for normal priority, second half for high */
  39         offset = 0;
  40         end = GUC_NUM_DOORBELLS / 2;
  41         if (priority <= GUC_CLIENT_PRIORITY_HIGH) {
  42                 offset = end;
  43                 end += offset;
  44         }
  45
  46         id = find_next_zero_bit(guc->doorbell_bitmap, end, offset);
  47         if (id < end)
  48                 return true;
  49
  50         return false;
  51 }
  52
  53 static int check_all_doorbells(struct intel_guc *guc)
  54 {
  55         u16 db_id;
  56
  57         pr_info_once("Max number of doorbells: %d", GUC_NUM_DOORBELLS);
  58         for (db_id = 0; db_id < GUC_NUM_DOORBELLS; ++db_id) {
  59                 if (!doorbell_ok(guc, db_id)) {
  60                         pr_err("doorbell %d, not ok\n", db_id);
  61                         return -EIO;
  62                 }
  63         }
  64
  65         return 0;
  66 }
  67
  68 static int ring_doorbell_nop(struct intel_guc_client *client)
  69 {
  70         struct guc_process_desc *desc = __get_process_desc(client);
  71         int err;
  72
  73         client->use_nop_wqi = true;
  74
  75         spin_lock_irq(&client->wq_lock);
  76
  77         guc_wq_item_append(client, 0, 0, 0, 0);
  78         guc_ring_doorbell(client);
  79
  80         spin_unlock_irq(&client->wq_lock);
  81
  82         client->use_nop_wqi = false;
  83
  84         /* if there are no issues GuC will update the WQ head and keep the
  85          * WQ in active status
  86          */
  87         err = wait_for(READ_ONCE(desc->head) == READ_ONCE(desc->tail), 10);
  88         if (err) {
  89                 pr_err("doorbell %u ring failed!\n", client->doorbell_id);
  90                 return -EIO;
  91         }
  92
  93         if (desc->wq_status != WQ_STATUS_ACTIVE) {
  94                 pr_err("doorbell %u ring put WQ in bad state (%u)!\n",
  95                        client->doorbell_id, desc->wq_status);
  96                 return -EIO;
  97         }
  98
  99         return 0;
 100 }
 101
 102 /*
 103  * Basic client sanity check, handy to validate create_clients.
 104  */
 105 static int validate_client(struct intel_guc_client *client,
 106                            int client_priority,
 107                            bool is_preempt_client)
 108 {
 109         struct drm_i915_private *dev_priv = guc_to_i915(client->guc);
 110         struct i915_gem_context *ctx_owner = is_preempt_client ?
 111                         dev_priv->preempt_context : dev_priv->kernel_context;
 112
 113         if (client->owner != ctx_owner ||
 114             client->engines != INTEL_INFO(dev_priv)->ring_mask ||
 115             client->priority != client_priority ||
 116             client->doorbell_id == GUC_DOORBELL_INVALID)
 117                 return -EINVAL;
 118         else
 119                 return 0;
 120 }
 121
 122 static bool client_doorbell_in_sync(struct intel_guc_client *client)
 123 {
 124         return !client || doorbell_ok(client->guc, client->doorbell_id);
 125 }
 126
 127 /*
 128  * Check that we're able to synchronize guc_clients with their doorbells
 129  *
 130  * We're creating clients and reserving doorbells once, at module load. During
 131  * module lifetime, GuC, doorbell HW, and i915 state may go out of sync due to
 132  * GuC being reset. In other words - GuC clients are still around, but the
 133  * status of their doorbells may be incorrect. This is the reason behind
 134  * validating that the doorbells status expected by the driver matches what the
 135  * GuC/HW have.
 136  */
 137 static int igt_guc_clients(void *args)
 138 {
 139         struct drm_i915_private *dev_priv = args;
 140         struct intel_guc *guc;
 141         int err = 0;
 142
 143         GEM_BUG_ON(!HAS_GUC(dev_priv));
 144         mutex_lock(&dev_priv->drm.struct_mutex);
 145         intel_runtime_pm_get(dev_priv);
 146
 147         guc = &dev_priv->guc;
 148         if (!guc) {
 149                 pr_err("No guc object!\n");
 150                 err = -EINVAL;
 151                 goto unlock;
 152         }
 153
 154         err = check_all_doorbells(guc);
 155         if (err)
 156                 goto unlock;
 157
 158         /*
 159          * Get rid of clients created during driver load because the test will
 160          * recreate them.
 161          */
 162         guc_clients_disable(guc);
 163         guc_clients_destroy(guc);
 164         if (guc->execbuf_client || guc->preempt_client) {
 165                 pr_err("guc_clients_destroy lied!\n");
 166                 err = -EINVAL;
 167                 goto unlock;
 168         }
 169
 170         err = guc_clients_create(guc);
 171         if (err) {
 172                 pr_err("Failed to create clients\n");
 173                 goto unlock;
 174         }
 175         GEM_BUG_ON(!guc->execbuf_client);
 176
 177         err = validate_client(guc->execbuf_client,
 178                               GUC_CLIENT_PRIORITY_KMD_NORMAL, false);
 179         if (err) {
 180                 pr_err("execbug client validation failed\n");
 181                 goto out;
 182         }
 183
 184         if (guc->preempt_client) {
 185                 err = validate_client(guc->preempt_client,
 186                                       GUC_CLIENT_PRIORITY_KMD_HIGH, true);
 187                 if (err) {
 188                         pr_err("preempt client validation failed\n");
 189                         goto out;
 190                 }
 191         }
 192
 193         /* each client should now have reserved a doorbell */
 194         if (!has_doorbell(guc->execbuf_client) ||
 195             (guc->preempt_client && !has_doorbell(guc->preempt_client))) {
 196                 pr_err("guc_clients_create didn't reserve doorbells\n");
 197                 err = -EINVAL;
 198                 goto out;
 199         }
 200
 201         /* Now enable the clients */
 202         guc_clients_enable(guc);
 203
 204         /* each client should now have received a doorbell */
 205         if (!client_doorbell_in_sync(guc->execbuf_client) ||
 206             !client_doorbell_in_sync(guc->preempt_client)) {
 207                 pr_err("failed to initialize the doorbells\n");
 208                 err = -EINVAL;
 209                 goto out;
 210         }
 211
 212         /*
 213          * Basic test - an attempt to reallocate a valid doorbell to the
 214          * client it is currently assigned should not cause a failure.
 215          */
 216         err = create_doorbell(guc->execbuf_client);
 217
 218 out:
 219         /*
 220          * Leave clean state for other test, plus the driver always destroy the
 221          * clients during unload.
 222          */
 223         guc_clients_disable(guc);
 224         guc_clients_destroy(guc);
 225         guc_clients_create(guc);
 226         guc_clients_enable(guc);
 227 unlock:
 228         intel_runtime_pm_put(dev_priv);
 229         mutex_unlock(&dev_priv->drm.struct_mutex);
 230         return err;
 231 }
 232
 233 /*
 234  * Create as many clients as number of doorbells. Note that there's already
 235  * client(s)/doorbell(s) created during driver load, but this test creates
 236  * its own and do not interact with the existing ones.
 237  */
 238 static int igt_guc_doorbells(void *arg)
 239 {
 240         struct drm_i915_private *dev_priv = arg;
 241         struct intel_guc *guc;
 242         int i, err = 0;
 243         u16 db_id;
 244
 245         GEM_BUG_ON(!HAS_GUC(dev_priv));
 246         mutex_lock(&dev_priv->drm.struct_mutex);
 247         intel_runtime_pm_get(dev_priv);
 248
 249         guc = &dev_priv->guc;
 250         if (!guc) {
 251                 pr_err("No guc object!\n");
 252                 err = -EINVAL;
 253                 goto unlock;
 254         }
 255
 256         err = check_all_doorbells(guc);
 257         if (err)
 258                 goto unlock;
 259
 260         for (i = 0; i < ATTEMPTS; i++) {
 261                 clients[i] = guc_client_alloc(dev_priv,
 262                                               INTEL_INFO(dev_priv)->ring_mask,
 263                                               i % GUC_CLIENT_PRIORITY_NUM,
 264                                               dev_priv->kernel_context);
 265
 266                 if (!clients[i]) {
 267                         pr_err("[%d] No guc client\n", i);
 268                         err = -EINVAL;
 269                         goto out;
 270                 }
 271
 272                 if (IS_ERR(clients[i])) {
 273                         if (PTR_ERR(clients[i]) != -ENOSPC) {
 274                                 pr_err("[%d] unexpected error\n", i);
 275                                 err = PTR_ERR(clients[i]);
 276                                 goto out;
 277                         }
 278
 279                         if (available_dbs(guc, i % GUC_CLIENT_PRIORITY_NUM)) {
 280                                 pr_err("[%d] non-db related alloc fail\n", i);
 281                                 err = -EINVAL;
 282                                 goto out;
 283                         }
 284
 285                         /* expected, ran out of dbs for this client type */
 286                         continue;
 287                 }
 288
 289                 /*
 290                  * The check below is only valid because we keep a doorbell
 291                  * assigned during the whole life of the client.
 292                  */
 293                 if (clients[i]->stage_id >= GUC_NUM_DOORBELLS) {
 294                         pr_err("[%d] more clients than doorbells (%d >= %d)\n",
 295                                i, clients[i]->stage_id, GUC_NUM_DOORBELLS);
 296                         err = -EINVAL;
 297                         goto out;
 298                 }
 299
 300                 err = validate_client(clients[i],
 301                                       i % GUC_CLIENT_PRIORITY_NUM, false);
 302                 if (err) {
 303                         pr_err("[%d] client_alloc sanity check failed!\n", i);
 304                         err = -EINVAL;
 305                         goto out;
 306                 }
 307
 308                 db_id = clients[i]->doorbell_id;
 309
 310                 err = __guc_client_enable(clients[i]);
 311                 if (err) {
 312                         pr_err("[%d] Failed to create a doorbell\n", i);
 313                         goto out;
 314                 }
 315
 316                 /* doorbell id shouldn't change, we are holding the mutex */
 317                 if (db_id != clients[i]->doorbell_id) {
 318                         pr_err("[%d] doorbell id changed (%d != %d)\n",
 319                                i, db_id, clients[i]->doorbell_id);
 320                         err = -EINVAL;
 321                         goto out;
 322                 }
 323
 324                 err = check_all_doorbells(guc);
 325                 if (err)
 326                         goto out;
 327
 328                 err = ring_doorbell_nop(clients[i]);
 329                 if (err)
 330                         goto out;
 331         }
 332
 333 out:
 334         for (i = 0; i < ATTEMPTS; i++)
 335                 if (!IS_ERR_OR_NULL(clients[i])) {
 336                         __guc_client_disable(clients[i]);
 337                         guc_client_free(clients[i]);
 338                 }
 339 unlock:
 340         intel_runtime_pm_put(dev_priv);
 341         mutex_unlock(&dev_priv->drm.struct_mutex);
 342         return err;
 343 }
 344
 345 int intel_guc_live_selftest(struct drm_i915_private *dev_priv)
 346 {
 347         static const struct i915_subtest tests[] = {
 348                 SUBTEST(igt_guc_clients),
 349                 SUBTEST(igt_guc_doorbells),
 350         };
 351
 352         if (!USES_GUC_SUBMISSION(dev_priv))
 353                 return 0;
 354
 355         return i915_subtests(tests, dev_priv);
 356 }