drivers/gpu/drm/i915/intel_uncore.c

   1 /*
   2  * Copyright © 2013 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 #include "i915_drv.h"
  25 #include "intel_drv.h"
  26 #include "i915_vgpu.h"
  27
  28 #include <linux/pm_runtime.h>
  29
  30 #define FORCEWAKE_ACK_TIMEOUT_MS 50
  31
  32 #define __raw_posting_read(dev_priv__, reg__) (void)__raw_i915_read32((dev_priv__), (reg__))
  33
  34 static const char * const forcewake_domain_names[] = {
  35         "render",
  36         "blitter",
  37         "media",
  38 };
  39
  40 const char *
  41 intel_uncore_forcewake_domain_to_str(const enum forcewake_domain_id id)
  42 {
  43         BUILD_BUG_ON(ARRAY_SIZE(forcewake_domain_names) != FW_DOMAIN_ID_COUNT);
  44
  45         if (id >= 0 && id < FW_DOMAIN_ID_COUNT)
  46                 return forcewake_domain_names[id];
  47
  48         WARN_ON(id);
  49
  50         return "unknown";
  51 }
  52
  53 static inline void
  54 fw_domain_reset(const struct intel_uncore_forcewake_domain *d)
  55 {
  56         WARN_ON(!i915_mmio_reg_valid(d->reg_set));
  57         __raw_i915_write32(d->i915, d->reg_set, d->val_reset);
  58 }
  59
  60 static inline void
  61 fw_domain_arm_timer(struct intel_uncore_forcewake_domain *d)
  62 {
  63         mod_timer_pinned(&d->timer, jiffies + 1);
  64 }
  65
  66 static inline void
  67 fw_domain_wait_ack_clear(const struct intel_uncore_forcewake_domain *d)
  68 {
  69         if (wait_for_atomic((__raw_i915_read32(d->i915, d->reg_ack) &
  70                              FORCEWAKE_KERNEL) == 0,
  71                             FORCEWAKE_ACK_TIMEOUT_MS))
  72                 DRM_ERROR("%s: timed out waiting for forcewake ack to clear.\n",
  73                           intel_uncore_forcewake_domain_to_str(d->id));
  74 }
  75
  76 static inline void
  77 fw_domain_get(const struct intel_uncore_forcewake_domain *d)
  78 {
  79         __raw_i915_write32(d->i915, d->reg_set, d->val_set);
  80 }
  81
  82 static inline void
  83 fw_domain_wait_ack(const struct intel_uncore_forcewake_domain *d)
  84 {
  85         if (wait_for_atomic((__raw_i915_read32(d->i915, d->reg_ack) &
  86                              FORCEWAKE_KERNEL),
  87                             FORCEWAKE_ACK_TIMEOUT_MS))
  88                 DRM_ERROR("%s: timed out waiting for forcewake ack request.\n",
  89                           intel_uncore_forcewake_domain_to_str(d->id));
  90 }
  91
  92 static inline void
  93 fw_domain_put(const struct intel_uncore_forcewake_domain *d)
  94 {
  95         __raw_i915_write32(d->i915, d->reg_set, d->val_clear);
  96 }
  97
  98 static inline void
  99 fw_domain_posting_read(const struct intel_uncore_forcewake_domain *d)
 100 {
 101         /* something from same cacheline, but not from the set register */
 102         if (i915_mmio_reg_valid(d->reg_post))
 103                 __raw_posting_read(d->i915, d->reg_post);
 104 }
 105
 106 static void
 107 fw_domains_get(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains)
 108 {
 109         struct intel_uncore_forcewake_domain *d;
 110         enum forcewake_domain_id id;
 111
 112         for_each_fw_domain_mask(d, fw_domains, dev_priv, id) {
 113                 fw_domain_wait_ack_clear(d);
 114                 fw_domain_get(d);
 115                 fw_domain_wait_ack(d);
 116         }
 117 }
 118
 119 static void
 120 fw_domains_put(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains)
 121 {
 122         struct intel_uncore_forcewake_domain *d;
 123         enum forcewake_domain_id id;
 124
 125         for_each_fw_domain_mask(d, fw_domains, dev_priv, id) {
 126                 fw_domain_put(d);
 127                 fw_domain_posting_read(d);
 128         }
 129 }
 130
 131 static void
 132 fw_domains_posting_read(struct drm_i915_private *dev_priv)
 133 {
 134         struct intel_uncore_forcewake_domain *d;
 135         enum forcewake_domain_id id;
 136
 137         /* No need to do for all, just do for first found */
 138         for_each_fw_domain(d, dev_priv, id) {
 139                 fw_domain_posting_read(d);
 140                 break;
 141         }
 142 }
 143
 144 static void
 145 fw_domains_reset(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains)
 146 {
 147         struct intel_uncore_forcewake_domain *d;
 148         enum forcewake_domain_id id;
 149
 150         if (dev_priv->uncore.fw_domains == 0)
 151                 return;
 152
 153         for_each_fw_domain_mask(d, fw_domains, dev_priv, id)
 154                 fw_domain_reset(d);
 155
 156         fw_domains_posting_read(dev_priv);
 157 }
 158
 159 static void __gen6_gt_wait_for_thread_c0(struct drm_i915_private *dev_priv)
 160 {
 161         /* w/a for a sporadic read returning 0 by waiting for the GT
 162          * thread to wake up.
 163          */
 164         if (wait_for_atomic_us((__raw_i915_read32(dev_priv, GEN6_GT_THREAD_STATUS_REG) &
 165                                 GEN6_GT_THREAD_STATUS_CORE_MASK) == 0, 500))
 166                 DRM_ERROR("GT thread status wait timed out\n");
 167 }
 168
 169 static void fw_domains_get_with_thread_status(struct drm_i915_private *dev_priv,
 170                                               enum forcewake_domains fw_domains)
 171 {
 172         fw_domains_get(dev_priv, fw_domains);
 173
 174         /* WaRsForcewakeWaitTC0:snb,ivb,hsw,bdw,vlv */
 175         __gen6_gt_wait_for_thread_c0(dev_priv);
 176 }
 177
 178 static void gen6_gt_check_fifodbg(struct drm_i915_private *dev_priv)
 179 {
 180         u32 gtfifodbg;
 181
 182         gtfifodbg = __raw_i915_read32(dev_priv, GTFIFODBG);
 183         if (WARN(gtfifodbg, "GT wake FIFO error 0x%x\n", gtfifodbg))
 184                 __raw_i915_write32(dev_priv, GTFIFODBG, gtfifodbg);
 185 }
 186
 187 static void fw_domains_put_with_fifo(struct drm_i915_private *dev_priv,
 188                                      enum forcewake_domains fw_domains)
 189 {
 190         fw_domains_put(dev_priv, fw_domains);
 191         gen6_gt_check_fifodbg(dev_priv);
 192 }
 193
 194 static inline u32 fifo_free_entries(struct drm_i915_private *dev_priv)
 195 {
 196         u32 count = __raw_i915_read32(dev_priv, GTFIFOCTL);
 197
 198         return count & GT_FIFO_FREE_ENTRIES_MASK;
 199 }
 200
 201 static int __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv)
 202 {
 203         int ret = 0;
 204
 205         /* On VLV, FIFO will be shared by both SW and HW.
 206          * So, we need to read the FREE_ENTRIES everytime */
 207         if (IS_VALLEYVIEW(dev_priv))
 208                 dev_priv->uncore.fifo_count = fifo_free_entries(dev_priv);
 209
 210         if (dev_priv->uncore.fifo_count < GT_FIFO_NUM_RESERVED_ENTRIES) {
 211                 int loop = 500;
 212                 u32 fifo = fifo_free_entries(dev_priv);
 213
 214                 while (fifo <= GT_FIFO_NUM_RESERVED_ENTRIES && loop--) {
 215                         udelay(10);
 216                         fifo = fifo_free_entries(dev_priv);
 217                 }
 218                 if (WARN_ON(loop < 0 && fifo <= GT_FIFO_NUM_RESERVED_ENTRIES))
 219                         ++ret;
 220                 dev_priv->uncore.fifo_count = fifo;
 221         }
 222         dev_priv->uncore.fifo_count--;
 223
 224         return ret;
 225 }
 226
 227 static void intel_uncore_fw_release_timer(unsigned long arg)
 228 {
 229         struct intel_uncore_forcewake_domain *domain = (void *)arg;
 230         unsigned long irqflags;
 231
 232         assert_rpm_device_not_suspended(domain->i915);
 233
 234         spin_lock_irqsave(&domain->i915->uncore.lock, irqflags);
 235         if (WARN_ON(domain->wake_count == 0))
 236                 domain->wake_count++;
 237
 238         if (--domain->wake_count == 0)
 239                 domain->i915->uncore.funcs.force_wake_put(domain->i915,
 240                                                           1 << domain->id);
 241
 242         spin_unlock_irqrestore(&domain->i915->uncore.lock, irqflags);
 243 }
 244
 245 void intel_uncore_forcewake_reset(struct drm_device *dev, bool restore)
 246 {
 247         struct drm_i915_private *dev_priv = dev->dev_private;
 248         unsigned long irqflags;
 249         struct intel_uncore_forcewake_domain *domain;
 250         int retry_count = 100;
 251         enum forcewake_domain_id id;
 252         enum forcewake_domains fw = 0, active_domains;
 253
 254         /* Hold uncore.lock across reset to prevent any register access
 255          * with forcewake not set correctly. Wait until all pending
 256          * timers are run before holding.
 257          */
 258         while (1) {
 259                 active_domains = 0;
 260
 261                 for_each_fw_domain(domain, dev_priv, id) {
 262                         if (del_timer_sync(&domain->timer) == 0)
 263                                 continue;
 264
 265                         intel_uncore_fw_release_timer((unsigned long)domain);
 266                 }
 267
 268                 spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 269
 270                 for_each_fw_domain(domain, dev_priv, id) {
 271                         if (timer_pending(&domain->timer))
 272                                 active_domains |= (1 << id);
 273                 }
 274
 275                 if (active_domains == 0)
 276                         break;
 277
 278                 if (--retry_count == 0) {
 279                         DRM_ERROR("Timed out waiting for forcewake timers to finish\n");
 280                         break;
 281                 }
 282
 283                 spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 284                 cond_resched();
 285         }
 286
 287         WARN_ON(active_domains);
 288
 289         for_each_fw_domain(domain, dev_priv, id)
 290                 if (domain->wake_count)
 291                         fw |= 1 << id;
 292
 293         if (fw)
 294                 dev_priv->uncore.funcs.force_wake_put(dev_priv, fw);
 295
 296         fw_domains_reset(dev_priv, FORCEWAKE_ALL);
 297
 298         if (restore) { /* If reset with a user forcewake, try to restore */
 299                 if (fw)
 300                         dev_priv->uncore.funcs.force_wake_get(dev_priv, fw);
 301
 302                 if (IS_GEN6(dev) || IS_GEN7(dev))
 303                         dev_priv->uncore.fifo_count =
 304                                 fifo_free_entries(dev_priv);
 305         }
 306
 307         if (!restore)
 308                 assert_forcewakes_inactive(dev_priv);
 309
 310         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 311 }
 312
 313 static void intel_uncore_ellc_detect(struct drm_device *dev)
 314 {
 315         struct drm_i915_private *dev_priv = dev->dev_private;
 316
 317         if ((IS_HASWELL(dev) || IS_BROADWELL(dev) ||
 318              INTEL_INFO(dev)->gen >= 9) &&
 319             (__raw_i915_read32(dev_priv, HSW_EDRAM_PRESENT) & EDRAM_ENABLED)) {
 320                 /* The docs do not explain exactly how the calculation can be
 321                  * made. It is somewhat guessable, but for now, it's always
 322                  * 128MB.
 323                  * NB: We can't write IDICR yet because we do not have gt funcs
 324                  * set up */
 325                 dev_priv->ellc_size = 128;
 326                 DRM_INFO("Found %zuMB of eLLC\n", dev_priv->ellc_size);
 327         }
 328 }
 329
 330 static bool
 331 fpga_check_for_unclaimed_mmio(struct drm_i915_private *dev_priv)
 332 {
 333         u32 dbg;
 334
 335         dbg = __raw_i915_read32(dev_priv, FPGA_DBG);
 336         if (likely(!(dbg & FPGA_DBG_RM_NOCLAIM)))
 337                 return false;
 338
 339         __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 340
 341         return true;
 342 }
 343
 344 static bool
 345 vlv_check_for_unclaimed_mmio(struct drm_i915_private *dev_priv)
 346 {
 347         u32 cer;
 348
 349         cer = __raw_i915_read32(dev_priv, CLAIM_ER);
 350         if (likely(!(cer & (CLAIM_ER_OVERFLOW | CLAIM_ER_CTR_MASK))))
 351                 return false;
 352
 353         __raw_i915_write32(dev_priv, CLAIM_ER, CLAIM_ER_CLR);
 354
 355         return true;
 356 }
 357
 358 static bool
 359 check_for_unclaimed_mmio(struct drm_i915_private *dev_priv)
 360 {
 361         if (HAS_FPGA_DBG_UNCLAIMED(dev_priv))
 362                 return fpga_check_for_unclaimed_mmio(dev_priv);
 363
 364         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 365                 return vlv_check_for_unclaimed_mmio(dev_priv);
 366
 367         return false;
 368 }
 369
 370 static void __intel_uncore_early_sanitize(struct drm_device *dev,
 371                                           bool restore_forcewake)
 372 {
 373         struct drm_i915_private *dev_priv = dev->dev_private;
 374
 375         /* clear out unclaimed reg detection bit */
 376         if (check_for_unclaimed_mmio(dev_priv))
 377                 DRM_DEBUG("unclaimed mmio detected on uncore init, clearing\n");
 378
 379         /* clear out old GT FIFO errors */
 380         if (IS_GEN6(dev) || IS_GEN7(dev))
 381                 __raw_i915_write32(dev_priv, GTFIFODBG,
 382                                    __raw_i915_read32(dev_priv, GTFIFODBG));
 383
 384         /* WaDisableShadowRegForCpd:chv */
 385         if (IS_CHERRYVIEW(dev)) {
 386                 __raw_i915_write32(dev_priv, GTFIFOCTL,
 387                                    __raw_i915_read32(dev_priv, GTFIFOCTL) |
 388                                    GT_FIFO_CTL_BLOCK_ALL_POLICY_STALL |
 389                                    GT_FIFO_CTL_RC6_POLICY_STALL);
 390         }
 391
 392         intel_uncore_forcewake_reset(dev, restore_forcewake);
 393 }
 394
 395 void intel_uncore_early_sanitize(struct drm_device *dev, bool restore_forcewake)
 396 {
 397         __intel_uncore_early_sanitize(dev, restore_forcewake);
 398         i915_check_and_clear_faults(dev);
 399 }
 400
 401 void intel_uncore_sanitize(struct drm_device *dev)
 402 {
 403         i915.enable_rc6 = sanitize_rc6_option(dev, i915.enable_rc6);
 404
 405         /* BIOS often leaves RC6 enabled, but disable it for hw init */
 406         intel_disable_gt_powersave(dev);
 407 }
 408
 409 static void __intel_uncore_forcewake_get(struct drm_i915_private *dev_priv,
 410                                          enum forcewake_domains fw_domains)
 411 {
 412         struct intel_uncore_forcewake_domain *domain;
 413         enum forcewake_domain_id id;
 414
 415         if (!dev_priv->uncore.funcs.force_wake_get)
 416                 return;
 417
 418         fw_domains &= dev_priv->uncore.fw_domains;
 419
 420         for_each_fw_domain_mask(domain, fw_domains, dev_priv, id) {
 421                 if (domain->wake_count++)
 422                         fw_domains &= ~(1 << id);
 423         }
 424
 425         if (fw_domains)
 426                 dev_priv->uncore.funcs.force_wake_get(dev_priv, fw_domains);
 427 }
 428
 429 /**
 430  * intel_uncore_forcewake_get - grab forcewake domain references
 431  * @dev_priv: i915 device instance
 432  * @fw_domains: forcewake domains to get reference on
 433  *
 434  * This function can be used get GT's forcewake domain references.
 435  * Normal register access will handle the forcewake domains automatically.
 436  * However if some sequence requires the GT to not power down a particular
 437  * forcewake domains this function should be called at the beginning of the
 438  * sequence. And subsequently the reference should be dropped by symmetric
 439  * call to intel_unforce_forcewake_put(). Usually caller wants all the domains
 440  * to be kept awake so the @fw_domains would be then FORCEWAKE_ALL.
 441  */
 442 void intel_uncore_forcewake_get(struct drm_i915_private *dev_priv,
 443                                 enum forcewake_domains fw_domains)
 444 {
 445         unsigned long irqflags;
 446
 447         if (!dev_priv->uncore.funcs.force_wake_get)
 448                 return;
 449
 450         assert_rpm_wakelock_held(dev_priv);
 451
 452         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 453         __intel_uncore_forcewake_get(dev_priv, fw_domains);
 454         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 455 }
 456
 457 /**
 458  * intel_uncore_forcewake_get__locked - grab forcewake domain references
 459  * @dev_priv: i915 device instance
 460  * @fw_domains: forcewake domains to get reference on
 461  *
 462  * See intel_uncore_forcewake_get(). This variant places the onus
 463  * on the caller to explicitly handle the dev_priv->uncore.lock spinlock.
 464  */
 465 void intel_uncore_forcewake_get__locked(struct drm_i915_private *dev_priv,
 466                                         enum forcewake_domains fw_domains)
 467 {
 468         assert_spin_locked(&dev_priv->uncore.lock);
 469
 470         if (!dev_priv->uncore.funcs.force_wake_get)
 471                 return;
 472
 473         __intel_uncore_forcewake_get(dev_priv, fw_domains);
 474 }
 475
 476 static void __intel_uncore_forcewake_put(struct drm_i915_private *dev_priv,
 477                                          enum forcewake_domains fw_domains)
 478 {
 479         struct intel_uncore_forcewake_domain *domain;
 480         enum forcewake_domain_id id;
 481
 482         if (!dev_priv->uncore.funcs.force_wake_put)
 483                 return;
 484
 485         fw_domains &= dev_priv->uncore.fw_domains;
 486
 487         for_each_fw_domain_mask(domain, fw_domains, dev_priv, id) {
 488                 if (WARN_ON(domain->wake_count == 0))
 489                         continue;
 490
 491                 if (--domain->wake_count)
 492                         continue;
 493
 494                 domain->wake_count++;
 495                 fw_domain_arm_timer(domain);
 496         }
 497 }
 498
 499 /**
 500  * intel_uncore_forcewake_put - release a forcewake domain reference
 501  * @dev_priv: i915 device instance
 502  * @fw_domains: forcewake domains to put references
 503  *
 504  * This function drops the device-level forcewakes for specified
 505  * domains obtained by intel_uncore_forcewake_get().
 506  */
 507 void intel_uncore_forcewake_put(struct drm_i915_private *dev_priv,
 508                                 enum forcewake_domains fw_domains)
 509 {
 510         unsigned long irqflags;
 511
 512         if (!dev_priv->uncore.funcs.force_wake_put)
 513                 return;
 514
 515         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 516         __intel_uncore_forcewake_put(dev_priv, fw_domains);
 517         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 518 }
 519
 520 /**
 521  * intel_uncore_forcewake_put__locked - grab forcewake domain references
 522  * @dev_priv: i915 device instance
 523  * @fw_domains: forcewake domains to get reference on
 524  *
 525  * See intel_uncore_forcewake_put(). This variant places the onus
 526  * on the caller to explicitly handle the dev_priv->uncore.lock spinlock.
 527  */
 528 void intel_uncore_forcewake_put__locked(struct drm_i915_private *dev_priv,
 529                                         enum forcewake_domains fw_domains)
 530 {
 531         assert_spin_locked(&dev_priv->uncore.lock);
 532
 533         if (!dev_priv->uncore.funcs.force_wake_put)
 534                 return;
 535
 536         __intel_uncore_forcewake_put(dev_priv, fw_domains);
 537 }
 538
 539 void assert_forcewakes_inactive(struct drm_i915_private *dev_priv)
 540 {
 541         struct intel_uncore_forcewake_domain *domain;
 542         enum forcewake_domain_id id;
 543
 544         if (!dev_priv->uncore.funcs.force_wake_get)
 545                 return;
 546
 547         for_each_fw_domain(domain, dev_priv, id)
 548                 WARN_ON(domain->wake_count);
 549 }
 550
 551 /* We give fast paths for the really cool registers */
 552 #define NEEDS_FORCE_WAKE(reg) ((reg) < 0x40000)
 553
 554 #define REG_RANGE(reg, start, end) ((reg) >= (start) && (reg) < (end))
 555
 556 #define FORCEWAKE_VLV_RENDER_RANGE_OFFSET(reg) \
 557         (REG_RANGE((reg), 0x2000, 0x4000) || \
 558          REG_RANGE((reg), 0x5000, 0x8000) || \
 559          REG_RANGE((reg), 0xB000, 0x12000) || \
 560          REG_RANGE((reg), 0x2E000, 0x30000))
 561
 562 #define FORCEWAKE_VLV_MEDIA_RANGE_OFFSET(reg) \
 563         (REG_RANGE((reg), 0x12000, 0x14000) || \
 564          REG_RANGE((reg), 0x22000, 0x24000) || \
 565          REG_RANGE((reg), 0x30000, 0x40000))
 566
 567 #define FORCEWAKE_CHV_RENDER_RANGE_OFFSET(reg) \
 568         (REG_RANGE((reg), 0x2000, 0x4000) || \
 569          REG_RANGE((reg), 0x5200, 0x8000) || \
 570          REG_RANGE((reg), 0x8300, 0x8500) || \
 571          REG_RANGE((reg), 0xB000, 0xB480) || \
 572          REG_RANGE((reg), 0xE000, 0xE800))
 573
 574 #define FORCEWAKE_CHV_MEDIA_RANGE_OFFSET(reg) \
 575         (REG_RANGE((reg), 0x8800, 0x8900) || \
 576          REG_RANGE((reg), 0xD000, 0xD800) || \
 577          REG_RANGE((reg), 0x12000, 0x14000) || \
 578          REG_RANGE((reg), 0x1A000, 0x1C000) || \
 579          REG_RANGE((reg), 0x1E800, 0x1EA00) || \
 580          REG_RANGE((reg), 0x30000, 0x38000))
 581
 582 #define FORCEWAKE_CHV_COMMON_RANGE_OFFSET(reg) \
 583         (REG_RANGE((reg), 0x4000, 0x5000) || \
 584          REG_RANGE((reg), 0x8000, 0x8300) || \
 585          REG_RANGE((reg), 0x8500, 0x8600) || \
 586          REG_RANGE((reg), 0x9000, 0xB000) || \
 587          REG_RANGE((reg), 0xF000, 0x10000))
 588
 589 #define FORCEWAKE_GEN9_UNCORE_RANGE_OFFSET(reg) \
 590         REG_RANGE((reg), 0xB00,  0x2000)
 591
 592 #define FORCEWAKE_GEN9_RENDER_RANGE_OFFSET(reg) \
 593         (REG_RANGE((reg), 0x2000, 0x2700) || \
 594          REG_RANGE((reg), 0x3000, 0x4000) || \
 595          REG_RANGE((reg), 0x5200, 0x8000) || \
 596          REG_RANGE((reg), 0x8140, 0x8160) || \
 597          REG_RANGE((reg), 0x8300, 0x8500) || \
 598          REG_RANGE((reg), 0x8C00, 0x8D00) || \
 599          REG_RANGE((reg), 0xB000, 0xB480) || \
 600          REG_RANGE((reg), 0xE000, 0xE900) || \
 601          REG_RANGE((reg), 0x24400, 0x24800))
 602
 603 #define FORCEWAKE_GEN9_MEDIA_RANGE_OFFSET(reg) \
 604         (REG_RANGE((reg), 0x8130, 0x8140) || \
 605          REG_RANGE((reg), 0x8800, 0x8A00) || \
 606          REG_RANGE((reg), 0xD000, 0xD800) || \
 607          REG_RANGE((reg), 0x12000, 0x14000) || \
 608          REG_RANGE((reg), 0x1A000, 0x1EA00) || \
 609          REG_RANGE((reg), 0x30000, 0x40000))
 610
 611 #define FORCEWAKE_GEN9_COMMON_RANGE_OFFSET(reg) \
 612         REG_RANGE((reg), 0x9400, 0x9800)
 613
 614 #define FORCEWAKE_GEN9_BLITTER_RANGE_OFFSET(reg) \
 615         ((reg) < 0x40000 && \
 616          !FORCEWAKE_GEN9_UNCORE_RANGE_OFFSET(reg) && \
 617          !FORCEWAKE_GEN9_RENDER_RANGE_OFFSET(reg) && \
 618          !FORCEWAKE_GEN9_MEDIA_RANGE_OFFSET(reg) && \
 619          !FORCEWAKE_GEN9_COMMON_RANGE_OFFSET(reg))
 620
 621 static void
 622 ilk_dummy_write(struct drm_i915_private *dev_priv)
 623 {
 624         /* WaIssueDummyWriteToWakeupFromRC6:ilk Issue a dummy write to wake up
 625          * the chip from rc6 before touching it for real. MI_MODE is masked,
 626          * hence harmless to write 0 into. */
 627         __raw_i915_write32(dev_priv, MI_MODE, 0);
 628 }
 629
 630 static void
 631 __unclaimed_reg_debug(struct drm_i915_private *dev_priv,
 632                       const i915_reg_t reg,
 633                       const bool read,
 634                       const bool before)
 635 {
 636         /* XXX. We limit the auto arming traces for mmio
 637          * debugs on these platforms. There are just too many
 638          * revealed by these and CI/Bat suffers from the noise.
 639          * Please fix and then re-enable the automatic traces.
 640          */
 641         if (i915.mmio_debug < 2 &&
 642             (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)))
 643                 return;
 644
 645         if (WARN(check_for_unclaimed_mmio(dev_priv),
 646                  "Unclaimed register detected %s %s register 0x%x\n",
 647                  before ? "before" : "after",
 648                  read ? "reading" : "writing to",
 649                  i915_mmio_reg_offset(reg)))
 650                 i915.mmio_debug--; /* Only report the first N failures */
 651 }
 652
 653 static inline void
 654 unclaimed_reg_debug(struct drm_i915_private *dev_priv,
 655                     const i915_reg_t reg,
 656                     const bool read,
 657                     const bool before)
 658 {
 659         if (likely(!i915.mmio_debug))
 660                 return;
 661
 662         __unclaimed_reg_debug(dev_priv, reg, read, before);
 663 }
 664
 665 #define GEN2_READ_HEADER(x) \
 666         u##x val = 0; \
 667         assert_rpm_wakelock_held(dev_priv);
 668
 669 #define GEN2_READ_FOOTER \
 670         trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \
 671         return val
 672
 673 #define __gen2_read(x) \
 674 static u##x \
 675 gen2_read##x(struct drm_i915_private *dev_priv, i915_reg_t reg, bool trace) { \
 676         GEN2_READ_HEADER(x); \
 677         val = __raw_i915_read##x(dev_priv, reg); \
 678         GEN2_READ_FOOTER; \
 679 }
 680
 681 #define __gen5_read(x) \
 682 static u##x \
 683 gen5_read##x(struct drm_i915_private *dev_priv, i915_reg_t reg, bool trace) { \
 684         GEN2_READ_HEADER(x); \
 685         ilk_dummy_write(dev_priv); \
 686         val = __raw_i915_read##x(dev_priv, reg); \
 687         GEN2_READ_FOOTER; \
 688 }
 689
 690 __gen5_read(8)
 691 __gen5_read(16)
 692 __gen5_read(32)
 693 __gen5_read(64)
 694 __gen2_read(8)
 695 __gen2_read(16)
 696 __gen2_read(32)
 697 __gen2_read(64)
 698
 699 #undef __gen5_read
 700 #undef __gen2_read
 701
 702 #undef GEN2_READ_FOOTER
 703 #undef GEN2_READ_HEADER
 704
 705 #define GEN6_READ_HEADER(x) \
 706         u32 offset = i915_mmio_reg_offset(reg); \
 707         unsigned long irqflags; \
 708         u##x val = 0; \
 709         assert_rpm_wakelock_held(dev_priv); \
 710         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); \
 711         unclaimed_reg_debug(dev_priv, reg, true, true)
 712
 713 #define GEN6_READ_FOOTER \
 714         unclaimed_reg_debug(dev_priv, reg, true, false); \
 715         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
 716         trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \
 717         return val
 718
 719 static inline void __force_wake_auto(struct drm_i915_private *dev_priv,
 720                                      enum forcewake_domains fw_domains)
 721 {
 722         struct intel_uncore_forcewake_domain *domain;
 723         enum forcewake_domain_id id;
 724
 725         if (WARN_ON(!fw_domains))
 726                 return;
 727
 728         /* Ideally GCC would be constant-fold and eliminate this loop */
 729         for_each_fw_domain_mask(domain, fw_domains, dev_priv, id) {
 730                 if (domain->wake_count) {
 731                         fw_domains &= ~(1 << id);
 732                         continue;
 733                 }
 734
 735                 domain->wake_count++;
 736                 fw_domain_arm_timer(domain);
 737         }
 738
 739         if (fw_domains)
 740                 dev_priv->uncore.funcs.force_wake_get(dev_priv, fw_domains);
 741 }
 742
 743 #define __gen6_read(x) \
 744 static u##x \
 745 gen6_read##x(struct drm_i915_private *dev_priv, i915_reg_t reg, bool trace) { \
 746         GEN6_READ_HEADER(x); \
 747         if (NEEDS_FORCE_WAKE(offset)) \
 748                 __force_wake_auto(dev_priv, FORCEWAKE_RENDER); \
 749         val = __raw_i915_read##x(dev_priv, reg); \
 750         GEN6_READ_FOOTER; \
 751 }
 752
 753 #define __vlv_read(x) \
 754 static u##x \
 755 vlv_read##x(struct drm_i915_private *dev_priv, i915_reg_t reg, bool trace) { \
 756         enum forcewake_domains fw_engine = 0; \
 757         GEN6_READ_HEADER(x); \
 758         if (!NEEDS_FORCE_WAKE(offset)) \
 759                 fw_engine = 0; \
 760         else if (FORCEWAKE_VLV_RENDER_RANGE_OFFSET(offset)) \
 761                 fw_engine = FORCEWAKE_RENDER; \
 762         else if (FORCEWAKE_VLV_MEDIA_RANGE_OFFSET(offset)) \
 763                 fw_engine = FORCEWAKE_MEDIA; \
 764         if (fw_engine) \
 765                 __force_wake_auto(dev_priv, fw_engine); \
 766         val = __raw_i915_read##x(dev_priv, reg); \
 767         GEN6_READ_FOOTER; \
 768 }
 769
 770 #define __chv_read(x) \
 771 static u##x \
 772 chv_read##x(struct drm_i915_private *dev_priv, i915_reg_t reg, bool trace) { \
 773         enum forcewake_domains fw_engine = 0; \
 774         GEN6_READ_HEADER(x); \
 775         if (!NEEDS_FORCE_WAKE(offset)) \
 776                 fw_engine = 0; \
 777         else if (FORCEWAKE_CHV_RENDER_RANGE_OFFSET(offset)) \
 778                 fw_engine = FORCEWAKE_RENDER; \
 779         else if (FORCEWAKE_CHV_MEDIA_RANGE_OFFSET(offset)) \
 780                 fw_engine = FORCEWAKE_MEDIA; \
 781         else if (FORCEWAKE_CHV_COMMON_RANGE_OFFSET(offset)) \
 782                 fw_engine = FORCEWAKE_RENDER | FORCEWAKE_MEDIA; \
 783         if (fw_engine) \
 784                 __force_wake_auto(dev_priv, fw_engine); \
 785         val = __raw_i915_read##x(dev_priv, reg); \
 786         GEN6_READ_FOOTER; \
 787 }
 788
 789 #define SKL_NEEDS_FORCE_WAKE(reg) \
 790         ((reg) < 0x40000 && !FORCEWAKE_GEN9_UNCORE_RANGE_OFFSET(reg))
 791
 792 #define __gen9_read(x) \
 793 static u##x \
 794 gen9_read##x(struct drm_i915_private *dev_priv, i915_reg_t reg, bool trace) { \
 795         enum forcewake_domains fw_engine; \
 796         GEN6_READ_HEADER(x); \
 797         if (!SKL_NEEDS_FORCE_WAKE(offset)) \
 798                 fw_engine = 0; \
 799         else if (FORCEWAKE_GEN9_RENDER_RANGE_OFFSET(offset)) \
 800                 fw_engine = FORCEWAKE_RENDER; \
 801         else if (FORCEWAKE_GEN9_MEDIA_RANGE_OFFSET(offset)) \
 802                 fw_engine = FORCEWAKE_MEDIA; \
 803         else if (FORCEWAKE_GEN9_COMMON_RANGE_OFFSET(offset)) \
 804                 fw_engine = FORCEWAKE_RENDER | FORCEWAKE_MEDIA; \
 805         else \
 806                 fw_engine = FORCEWAKE_BLITTER; \
 807         if (fw_engine) \
 808                 __force_wake_auto(dev_priv, fw_engine); \
 809         val = __raw_i915_read##x(dev_priv, reg); \
 810         GEN6_READ_FOOTER; \
 811 }
 812
 813 __gen9_read(8)
 814 __gen9_read(16)
 815 __gen9_read(32)
 816 __gen9_read(64)
 817 __chv_read(8)
 818 __chv_read(16)
 819 __chv_read(32)
 820 __chv_read(64)
 821 __vlv_read(8)
 822 __vlv_read(16)
 823 __vlv_read(32)
 824 __vlv_read(64)
 825 __gen6_read(8)
 826 __gen6_read(16)
 827 __gen6_read(32)
 828 __gen6_read(64)
 829
 830 #undef __gen9_read
 831 #undef __chv_read
 832 #undef __vlv_read
 833 #undef __gen6_read
 834 #undef GEN6_READ_FOOTER
 835 #undef GEN6_READ_HEADER
 836
 837 #define VGPU_READ_HEADER(x) \
 838         unsigned long irqflags; \
 839         u##x val = 0; \
 840         assert_rpm_device_not_suspended(dev_priv); \
 841         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags)
 842
 843 #define VGPU_READ_FOOTER \
 844         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
 845         trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \
 846         return val
 847
 848 #define __vgpu_read(x) \
 849 static u##x \
 850 vgpu_read##x(struct drm_i915_private *dev_priv, i915_reg_t reg, bool trace) { \
 851         VGPU_READ_HEADER(x); \
 852         val = __raw_i915_read##x(dev_priv, reg); \
 853         VGPU_READ_FOOTER; \
 854 }
 855
 856 __vgpu_read(8)
 857 __vgpu_read(16)
 858 __vgpu_read(32)
 859 __vgpu_read(64)
 860
 861 #undef __vgpu_read
 862 #undef VGPU_READ_FOOTER
 863 #undef VGPU_READ_HEADER
 864
 865 #define GEN2_WRITE_HEADER \
 866         trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \
 867         assert_rpm_wakelock_held(dev_priv); \
 868
 869 #define GEN2_WRITE_FOOTER
 870
 871 #define __gen2_write(x) \
 872 static void \
 873 gen2_write##x(struct drm_i915_private *dev_priv, i915_reg_t reg, u##x val, bool trace) { \
 874         GEN2_WRITE_HEADER; \
 875         __raw_i915_write##x(dev_priv, reg, val); \
 876         GEN2_WRITE_FOOTER; \
 877 }
 878
 879 #define __gen5_write(x) \
 880 static void \
 881 gen5_write##x(struct drm_i915_private *dev_priv, i915_reg_t reg, u##x val, bool trace) { \
 882         GEN2_WRITE_HEADER; \
 883         ilk_dummy_write(dev_priv); \
 884         __raw_i915_write##x(dev_priv, reg, val); \
 885         GEN2_WRITE_FOOTER; \
 886 }
 887
 888 __gen5_write(8)
 889 __gen5_write(16)
 890 __gen5_write(32)
 891 __gen5_write(64)
 892 __gen2_write(8)
 893 __gen2_write(16)
 894 __gen2_write(32)
 895 __gen2_write(64)
 896
 897 #undef __gen5_write
 898 #undef __gen2_write
 899
 900 #undef GEN2_WRITE_FOOTER
 901 #undef GEN2_WRITE_HEADER
 902
 903 #define GEN6_WRITE_HEADER \
 904         u32 offset = i915_mmio_reg_offset(reg); \
 905         unsigned long irqflags; \
 906         trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \
 907         assert_rpm_wakelock_held(dev_priv); \
 908         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); \
 909         unclaimed_reg_debug(dev_priv, reg, false, true)
 910
 911 #define GEN6_WRITE_FOOTER \
 912         unclaimed_reg_debug(dev_priv, reg, false, false); \
 913         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags)
 914
 915 #define __gen6_write(x) \
 916 static void \
 917 gen6_write##x(struct drm_i915_private *dev_priv, i915_reg_t reg, u##x val, bool trace) { \
 918         u32 __fifo_ret = 0; \
 919         GEN6_WRITE_HEADER; \
 920         if (NEEDS_FORCE_WAKE(offset)) { \
 921                 __fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
 922         } \
 923         __raw_i915_write##x(dev_priv, reg, val); \
 924         if (unlikely(__fifo_ret)) { \
 925                 gen6_gt_check_fifodbg(dev_priv); \
 926         } \
 927         GEN6_WRITE_FOOTER; \
 928 }
 929
 930 #define __hsw_write(x) \
 931 static void \
 932 hsw_write##x(struct drm_i915_private *dev_priv, i915_reg_t reg, u##x val, bool trace) { \
 933         u32 __fifo_ret = 0; \
 934         GEN6_WRITE_HEADER; \
 935         if (NEEDS_FORCE_WAKE(offset)) { \
 936                 __fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
 937         } \
 938         __raw_i915_write##x(dev_priv, reg, val); \
 939         if (unlikely(__fifo_ret)) { \
 940                 gen6_gt_check_fifodbg(dev_priv); \
 941         } \
 942         GEN6_WRITE_FOOTER; \
 943 }
 944
 945 static const i915_reg_t gen8_shadowed_regs[] = {
 946         FORCEWAKE_MT,
 947         GEN6_RPNSWREQ,
 948         GEN6_RC_VIDEO_FREQ,
 949         RING_TAIL(RENDER_RING_BASE),
 950         RING_TAIL(GEN6_BSD_RING_BASE),
 951         RING_TAIL(VEBOX_RING_BASE),
 952         RING_TAIL(BLT_RING_BASE),
 953         /* TODO: Other registers are not yet used */
 954 };
 955
 956 static bool is_gen8_shadowed(struct drm_i915_private *dev_priv,
 957                              i915_reg_t reg)
 958 {
 959         int i;
 960         for (i = 0; i < ARRAY_SIZE(gen8_shadowed_regs); i++)
 961                 if (i915_mmio_reg_equal(reg, gen8_shadowed_regs[i]))
 962                         return true;
 963
 964         return false;
 965 }
 966
 967 #define __gen8_write(x) \
 968 static void \
 969 gen8_write##x(struct drm_i915_private *dev_priv, i915_reg_t reg, u##x val, bool trace) { \
 970         GEN6_WRITE_HEADER; \
 971         if (NEEDS_FORCE_WAKE(offset) && !is_gen8_shadowed(dev_priv, reg)) \
 972                 __force_wake_auto(dev_priv, FORCEWAKE_RENDER); \
 973         __raw_i915_write##x(dev_priv, reg, val); \
 974         GEN6_WRITE_FOOTER; \
 975 }
 976
 977 #define __chv_write(x) \
 978 static void \
 979 chv_write##x(struct drm_i915_private *dev_priv, i915_reg_t reg, u##x val, bool trace) { \
 980         enum forcewake_domains fw_engine = 0; \
 981         GEN6_WRITE_HEADER; \
 982         if (!NEEDS_FORCE_WAKE(offset) || \
 983             is_gen8_shadowed(dev_priv, reg)) \
 984                 fw_engine = 0; \
 985         else if (FORCEWAKE_CHV_RENDER_RANGE_OFFSET(offset)) \
 986                 fw_engine = FORCEWAKE_RENDER; \
 987         else if (FORCEWAKE_CHV_MEDIA_RANGE_OFFSET(offset)) \
 988                 fw_engine = FORCEWAKE_MEDIA; \
 989         else if (FORCEWAKE_CHV_COMMON_RANGE_OFFSET(offset)) \
 990                 fw_engine = FORCEWAKE_RENDER | FORCEWAKE_MEDIA; \
 991         if (fw_engine) \
 992                 __force_wake_auto(dev_priv, fw_engine); \
 993         __raw_i915_write##x(dev_priv, reg, val); \
 994         GEN6_WRITE_FOOTER; \
 995 }
 996
 997 static const i915_reg_t gen9_shadowed_regs[] = {
 998         RING_TAIL(RENDER_RING_BASE),
 999         RING_TAIL(GEN6_BSD_RING_BASE),
1000         RING_TAIL(VEBOX_RING_BASE),
1001         RING_TAIL(BLT_RING_BASE),
1002         FORCEWAKE_BLITTER_GEN9,
1003         FORCEWAKE_RENDER_GEN9,
1004         FORCEWAKE_MEDIA_GEN9,
1005         GEN6_RPNSWREQ,
1006         GEN6_RC_VIDEO_FREQ,
1007         /* TODO: Other registers are not yet used */
1008 };
1009
1010 static bool is_gen9_shadowed(struct drm_i915_private *dev_priv,
1011                              i915_reg_t reg)
1012 {
1013         int i;
1014         for (i = 0; i < ARRAY_SIZE(gen9_shadowed_regs); i++)
1015                 if (i915_mmio_reg_equal(reg, gen9_shadowed_regs[i]))
1016                         return true;
1017
1018         return false;
1019 }
1020
1021 #define __gen9_write(x) \
1022 static void \
1023 gen9_write##x(struct drm_i915_private *dev_priv, i915_reg_t reg, u##x val, \
1024                 bool trace) { \
1025         enum forcewake_domains fw_engine; \
1026         GEN6_WRITE_HEADER; \
1027         if (!SKL_NEEDS_FORCE_WAKE(offset) || \
1028             is_gen9_shadowed(dev_priv, reg)) \
1029                 fw_engine = 0; \
1030         else if (FORCEWAKE_GEN9_RENDER_RANGE_OFFSET(offset)) \
1031                 fw_engine = FORCEWAKE_RENDER; \
1032         else if (FORCEWAKE_GEN9_MEDIA_RANGE_OFFSET(offset)) \
1033                 fw_engine = FORCEWAKE_MEDIA; \
1034         else if (FORCEWAKE_GEN9_COMMON_RANGE_OFFSET(offset)) \
1035                 fw_engine = FORCEWAKE_RENDER | FORCEWAKE_MEDIA; \
1036         else \
1037                 fw_engine = FORCEWAKE_BLITTER; \
1038         if (fw_engine) \
1039                 __force_wake_auto(dev_priv, fw_engine); \
1040         __raw_i915_write##x(dev_priv, reg, val); \
1041         GEN6_WRITE_FOOTER; \
1042 }
1043
1044 __gen9_write(8)
1045 __gen9_write(16)
1046 __gen9_write(32)
1047 __gen9_write(64)
1048 __chv_write(8)
1049 __chv_write(16)
1050 __chv_write(32)
1051 __chv_write(64)
1052 __gen8_write(8)
1053 __gen8_write(16)
1054 __gen8_write(32)
1055 __gen8_write(64)
1056 __hsw_write(8)
1057 __hsw_write(16)
1058 __hsw_write(32)
1059 __hsw_write(64)
1060 __gen6_write(8)
1061 __gen6_write(16)
1062 __gen6_write(32)
1063 __gen6_write(64)
1064
1065 #undef __gen9_write
1066 #undef __chv_write
1067 #undef __gen8_write
1068 #undef __hsw_write
1069 #undef __gen6_write
1070 #undef GEN6_WRITE_FOOTER
1071 #undef GEN6_WRITE_HEADER
1072
1073 #define VGPU_WRITE_HEADER \
1074         unsigned long irqflags; \
1075         trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \
1076         assert_rpm_device_not_suspended(dev_priv); \
1077         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags)
1078
1079 #define VGPU_WRITE_FOOTER \
1080         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags)
1081
1082 #define __vgpu_write(x) \
1083 static void vgpu_write##x(struct drm_i915_private *dev_priv, \
1084                           i915_reg_t reg, u##x val, bool trace) { \
1085         VGPU_WRITE_HEADER; \
1086         __raw_i915_write##x(dev_priv, reg, val); \
1087         VGPU_WRITE_FOOTER; \
1088 }
1089
1090 __vgpu_write(8)
1091 __vgpu_write(16)
1092 __vgpu_write(32)
1093 __vgpu_write(64)
1094
1095 #undef __vgpu_write
1096 #undef VGPU_WRITE_FOOTER
1097 #undef VGPU_WRITE_HEADER
1098
1099 #define ASSIGN_WRITE_MMIO_VFUNCS(x) \
1100 do { \
1101         dev_priv->uncore.funcs.mmio_writeb = x##_write8; \
1102         dev_priv->uncore.funcs.mmio_writew = x##_write16; \
1103         dev_priv->uncore.funcs.mmio_writel = x##_write32; \
1104         dev_priv->uncore.funcs.mmio_writeq = x##_write64; \
1105 } while (0)
1106
1107 #define ASSIGN_READ_MMIO_VFUNCS(x) \
1108 do { \
1109         dev_priv->uncore.funcs.mmio_readb = x##_read8; \
1110         dev_priv->uncore.funcs.mmio_readw = x##_read16; \
1111         dev_priv->uncore.funcs.mmio_readl = x##_read32; \
1112         dev_priv->uncore.funcs.mmio_readq = x##_read64; \
1113 } while (0)
1114
1115
1116 static void fw_domain_init(struct drm_i915_private *dev_priv,
1117                            enum forcewake_domain_id domain_id,
1118                            i915_reg_t reg_set,
1119                            i915_reg_t reg_ack)
1120 {
1121         struct intel_uncore_forcewake_domain *d;
1122
1123         if (WARN_ON(domain_id >= FW_DOMAIN_ID_COUNT))
1124                 return;
1125
1126         d = &dev_priv->uncore.fw_domain[domain_id];
1127
1128         WARN_ON(d->wake_count);
1129
1130         d->wake_count = 0;
1131         d->reg_set = reg_set;
1132         d->reg_ack = reg_ack;
1133
1134         if (IS_GEN6(dev_priv)) {
1135                 d->val_reset = 0;
1136                 d->val_set = FORCEWAKE_KERNEL;
1137                 d->val_clear = 0;
1138         } else {
1139                 /* WaRsClearFWBitsAtReset:bdw,skl */
1140                 d->val_reset = _MASKED_BIT_DISABLE(0xffff);
1141                 d->val_set = _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL);
1142                 d->val_clear = _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL);
1143         }
1144
1145         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
1146                 d->reg_post = FORCEWAKE_ACK_VLV;
1147         else if (IS_GEN6(dev_priv) || IS_GEN7(dev_priv) || IS_GEN8(dev_priv))
1148                 d->reg_post = ECOBUS;
1149
1150         d->i915 = dev_priv;
1151         d->id = domain_id;
1152
1153         setup_timer(&d->timer, intel_uncore_fw_release_timer, (unsigned long)d);
1154
1155         dev_priv->uncore.fw_domains |= (1 << domain_id);
1156
1157         fw_domain_reset(d);
1158 }
1159
1160 static void intel_uncore_fw_domains_init(struct drm_device *dev)
1161 {
1162         struct drm_i915_private *dev_priv = dev->dev_private;
1163
1164         if (INTEL_INFO(dev_priv)->gen <= 5)
1165                 return;
1166
1167         if (IS_GEN9(dev)) {
1168                 dev_priv->uncore.funcs.force_wake_get = fw_domains_get;
1169                 dev_priv->uncore.funcs.force_wake_put = fw_domains_put;
1170                 fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER,
1171                                FORCEWAKE_RENDER_GEN9,
1172                                FORCEWAKE_ACK_RENDER_GEN9);
1173                 fw_domain_init(dev_priv, FW_DOMAIN_ID_BLITTER,
1174                                FORCEWAKE_BLITTER_GEN9,
1175                                FORCEWAKE_ACK_BLITTER_GEN9);
1176                 fw_domain_init(dev_priv, FW_DOMAIN_ID_MEDIA,
1177                                FORCEWAKE_MEDIA_GEN9, FORCEWAKE_ACK_MEDIA_GEN9);
1178         } else if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
1179                 dev_priv->uncore.funcs.force_wake_get = fw_domains_get;
1180                 if (!IS_CHERRYVIEW(dev))
1181                         dev_priv->uncore.funcs.force_wake_put =
1182                                 fw_domains_put_with_fifo;
1183                 else
1184                         dev_priv->uncore.funcs.force_wake_put = fw_domains_put;
1185                 fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER,
1186                                FORCEWAKE_VLV, FORCEWAKE_ACK_VLV);
1187                 fw_domain_init(dev_priv, FW_DOMAIN_ID_MEDIA,
1188                                FORCEWAKE_MEDIA_VLV, FORCEWAKE_ACK_MEDIA_VLV);
1189         } else if (IS_HASWELL(dev) || IS_BROADWELL(dev)) {
1190                 dev_priv->uncore.funcs.force_wake_get =
1191                         fw_domains_get_with_thread_status;
1192                 dev_priv->uncore.funcs.force_wake_put = fw_domains_put;
1193                 fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER,
1194                                FORCEWAKE_MT, FORCEWAKE_ACK_HSW);
1195         } else if (IS_IVYBRIDGE(dev)) {
1196                 u32 ecobus;
1197
1198                 /* IVB configs may use multi-threaded forcewake */
1199
1200                 /* A small trick here - if the bios hasn't configured
1201                  * MT forcewake, and if the device is in RC6, then
1202                  * force_wake_mt_get will not wake the device and the
1203                  * ECOBUS read will return zero. Which will be
1204                  * (correctly) interpreted by the test below as MT
1205                  * forcewake being disabled.
1206                  */
1207                 dev_priv->uncore.funcs.force_wake_get =
1208                         fw_domains_get_with_thread_status;
1209                 dev_priv->uncore.funcs.force_wake_put =
1210                         fw_domains_put_with_fifo;
1211
1212                 /* We need to init first for ECOBUS access and then
1213                  * determine later if we want to reinit, in case of MT access is
1214                  * not working. In this stage we don't know which flavour this
1215                  * ivb is, so it is better to reset also the gen6 fw registers
1216                  * before the ecobus check.
1217                  */
1218
1219                 __raw_i915_write32(dev_priv, FORCEWAKE, 0);
1220                 __raw_posting_read(dev_priv, ECOBUS);
1221
1222                 fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER,
1223                                FORCEWAKE_MT, FORCEWAKE_MT_ACK);
1224
1225                 mutex_lock(&dev->struct_mutex);
1226                 fw_domains_get_with_thread_status(dev_priv, FORCEWAKE_ALL);
1227                 ecobus = __raw_i915_read32(dev_priv, ECOBUS);
1228                 fw_domains_put_with_fifo(dev_priv, FORCEWAKE_ALL);
1229                 mutex_unlock(&dev->struct_mutex);
1230
1231                 if (!(ecobus & FORCEWAKE_MT_ENABLE)) {
1232                         DRM_INFO("No MT forcewake available on Ivybridge, this can result in issues\n");
1233                         DRM_INFO("when using vblank-synced partial screen updates.\n");
1234                         fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER,
1235                                        FORCEWAKE, FORCEWAKE_ACK);
1236                 }
1237         } else if (IS_GEN6(dev)) {
1238                 dev_priv->uncore.funcs.force_wake_get =
1239                         fw_domains_get_with_thread_status;
1240                 dev_priv->uncore.funcs.force_wake_put =
1241                         fw_domains_put_with_fifo;
1242                 fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER,
1243                                FORCEWAKE, FORCEWAKE_ACK);
1244         }
1245
1246         /* All future platforms are expected to require complex power gating */
1247         WARN_ON(dev_priv->uncore.fw_domains == 0);
1248 }
1249
1250 void intel_uncore_init(struct drm_device *dev)
1251 {
1252         struct drm_i915_private *dev_priv = dev->dev_private;
1253
1254         i915_check_vgpu(dev);
1255
1256         intel_uncore_ellc_detect(dev);
1257         intel_uncore_fw_domains_init(dev);
1258         __intel_uncore_early_sanitize(dev, false);
1259
1260         dev_priv->uncore.unclaimed_mmio_check = 1;
1261
1262         switch (INTEL_INFO(dev)->gen) {
1263         default:
1264         case 9:
1265                 ASSIGN_WRITE_MMIO_VFUNCS(gen9);
1266                 ASSIGN_READ_MMIO_VFUNCS(gen9);
1267                 break;
1268         case 8:
1269                 if (IS_CHERRYVIEW(dev)) {
1270                         ASSIGN_WRITE_MMIO_VFUNCS(chv);
1271                         ASSIGN_READ_MMIO_VFUNCS(chv);
1272
1273                 } else {
1274                         ASSIGN_WRITE_MMIO_VFUNCS(gen8);
1275                         ASSIGN_READ_MMIO_VFUNCS(gen6);
1276                 }
1277                 break;
1278         case 7:
1279         case 6:
1280                 if (IS_HASWELL(dev)) {
1281                         ASSIGN_WRITE_MMIO_VFUNCS(hsw);
1282                 } else {
1283                         ASSIGN_WRITE_MMIO_VFUNCS(gen6);
1284                 }
1285
1286                 if (IS_VALLEYVIEW(dev)) {
1287                         ASSIGN_READ_MMIO_VFUNCS(vlv);
1288                 } else {
1289                         ASSIGN_READ_MMIO_VFUNCS(gen6);
1290                 }
1291                 break;
1292         case 5:
1293                 ASSIGN_WRITE_MMIO_VFUNCS(gen5);
1294                 ASSIGN_READ_MMIO_VFUNCS(gen5);
1295                 break;
1296         case 4:
1297         case 3:
1298         case 2:
1299                 ASSIGN_WRITE_MMIO_VFUNCS(gen2);
1300                 ASSIGN_READ_MMIO_VFUNCS(gen2);
1301                 break;
1302         }
1303
1304         if (intel_vgpu_active(dev)) {
1305                 ASSIGN_WRITE_MMIO_VFUNCS(vgpu);
1306                 ASSIGN_READ_MMIO_VFUNCS(vgpu);
1307         }
1308
1309         i915_check_and_clear_faults(dev);
1310 }
1311 #undef ASSIGN_WRITE_MMIO_VFUNCS
1312 #undef ASSIGN_READ_MMIO_VFUNCS
1313
1314 void intel_uncore_fini(struct drm_device *dev)
1315 {
1316         /* Paranoia: make sure we have disabled everything before we exit. */
1317         intel_uncore_sanitize(dev);
1318         intel_uncore_forcewake_reset(dev, false);
1319 }
1320
1321 #define GEN_RANGE(l, h) GENMASK(h, l)
1322
1323 static const struct register_whitelist {
1324         i915_reg_t offset_ldw, offset_udw;
1325         uint32_t size;
1326         /* supported gens, 0x10 for 4, 0x30 for 4 and 5, etc. */
1327         uint32_t gen_bitmask;
1328 } whitelist[] = {
1329         { .offset_ldw = RING_TIMESTAMP(RENDER_RING_BASE),
1330           .offset_udw = RING_TIMESTAMP_UDW(RENDER_RING_BASE),
1331           .size = 8, .gen_bitmask = GEN_RANGE(4, 9) },
1332 };
1333
1334 int i915_reg_read_ioctl(struct drm_device *dev,
1335                         void *data, struct drm_file *file)
1336 {
1337         struct drm_i915_private *dev_priv = dev->dev_private;
1338         struct drm_i915_reg_read *reg = data;
1339         struct register_whitelist const *entry = whitelist;
1340         unsigned size;
1341         i915_reg_t offset_ldw, offset_udw;
1342         int i, ret = 0;
1343
1344         for (i = 0; i < ARRAY_SIZE(whitelist); i++, entry++) {
1345                 if (i915_mmio_reg_offset(entry->offset_ldw) == (reg->offset & -entry->size) &&
1346                     (1 << INTEL_INFO(dev)->gen & entry->gen_bitmask))
1347                         break;
1348         }
1349
1350         if (i == ARRAY_SIZE(whitelist))
1351                 return -EINVAL;
1352
1353         /* We use the low bits to encode extra flags as the register should
1354          * be naturally aligned (and those that are not so aligned merely
1355          * limit the available flags for that register).
1356          */
1357         offset_ldw = entry->offset_ldw;
1358         offset_udw = entry->offset_udw;
1359         size = entry->size;
1360         size |= reg->offset ^ i915_mmio_reg_offset(offset_ldw);
1361
1362         intel_runtime_pm_get(dev_priv);
1363
1364         switch (size) {
1365         case 8 | 1:
1366                 reg->val = I915_READ64_2x32(offset_ldw, offset_udw);
1367                 break;
1368         case 8:
1369                 reg->val = I915_READ64(offset_ldw);
1370                 break;
1371         case 4:
1372                 reg->val = I915_READ(offset_ldw);
1373                 break;
1374         case 2:
1375                 reg->val = I915_READ16(offset_ldw);
1376                 break;
1377         case 1:
1378                 reg->val = I915_READ8(offset_ldw);
1379                 break;
1380         default:
1381                 ret = -EINVAL;
1382                 goto out;
1383         }
1384
1385 out:
1386         intel_runtime_pm_put(dev_priv);
1387         return ret;
1388 }
1389
1390 int i915_get_reset_stats_ioctl(struct drm_device *dev,
1391                                void *data, struct drm_file *file)
1392 {
1393         struct drm_i915_private *dev_priv = dev->dev_private;
1394         struct drm_i915_reset_stats *args = data;
1395         struct i915_ctx_hang_stats *hs;
1396         struct intel_context *ctx;
1397         int ret;
1398
1399         if (args->flags || args->pad)
1400                 return -EINVAL;
1401
1402         if (args->ctx_id == DEFAULT_CONTEXT_HANDLE && !capable(CAP_SYS_ADMIN))
1403                 return -EPERM;
1404
1405         ret = mutex_lock_interruptible(&dev->struct_mutex);
1406         if (ret)
1407                 return ret;
1408
1409         ctx = i915_gem_context_get(file->driver_priv, args->ctx_id);
1410         if (IS_ERR(ctx)) {
1411                 mutex_unlock(&dev->struct_mutex);
1412                 return PTR_ERR(ctx);
1413         }
1414         hs = &ctx->hang_stats;
1415
1416         if (capable(CAP_SYS_ADMIN))
1417                 args->reset_count = i915_reset_count(&dev_priv->gpu_error);
1418         else
1419                 args->reset_count = 0;
1420
1421         args->batch_active = hs->batch_active;
1422         args->batch_pending = hs->batch_pending;
1423
1424         mutex_unlock(&dev->struct_mutex);
1425
1426         return 0;
1427 }
1428
1429 static int i915_reset_complete(struct drm_device *dev)
1430 {
1431         u8 gdrst;
1432         pci_read_config_byte(dev->pdev, I915_GDRST, &gdrst);
1433         return (gdrst & GRDOM_RESET_STATUS) == 0;
1434 }
1435
1436 static int i915_do_reset(struct drm_device *dev, unsigned engine_mask)
1437 {
1438         /* assert reset for at least 20 usec */
1439         pci_write_config_byte(dev->pdev, I915_GDRST, GRDOM_RESET_ENABLE);
1440         udelay(20);
1441         pci_write_config_byte(dev->pdev, I915_GDRST, 0);
1442
1443         return wait_for(i915_reset_complete(dev), 500);
1444 }
1445
1446 static int g4x_reset_complete(struct drm_device *dev)
1447 {
1448         u8 gdrst;
1449         pci_read_config_byte(dev->pdev, I915_GDRST, &gdrst);
1450         return (gdrst & GRDOM_RESET_ENABLE) == 0;
1451 }
1452
1453 static int g33_do_reset(struct drm_device *dev, unsigned engine_mask)
1454 {
1455         pci_write_config_byte(dev->pdev, I915_GDRST, GRDOM_RESET_ENABLE);
1456         return wait_for(g4x_reset_complete(dev), 500);
1457 }
1458
1459 static int g4x_do_reset(struct drm_device *dev, unsigned engine_mask)
1460 {
1461         struct drm_i915_private *dev_priv = dev->dev_private;
1462         int ret;
1463
1464         pci_write_config_byte(dev->pdev, I915_GDRST,
1465                               GRDOM_RENDER | GRDOM_RESET_ENABLE);
1466         ret =  wait_for(g4x_reset_complete(dev), 500);
1467         if (ret)
1468                 return ret;
1469
1470         /* WaVcpClkGateDisableForMediaReset:ctg,elk */
1471         I915_WRITE(VDECCLK_GATE_D, I915_READ(VDECCLK_GATE_D) | VCP_UNIT_CLOCK_GATE_DISABLE);
1472         POSTING_READ(VDECCLK_GATE_D);
1473
1474         pci_write_config_byte(dev->pdev, I915_GDRST,
1475                               GRDOM_MEDIA | GRDOM_RESET_ENABLE);
1476         ret =  wait_for(g4x_reset_complete(dev), 500);
1477         if (ret)
1478                 return ret;
1479
1480         /* WaVcpClkGateDisableForMediaReset:ctg,elk */
1481         I915_WRITE(VDECCLK_GATE_D, I915_READ(VDECCLK_GATE_D) & ~VCP_UNIT_CLOCK_GATE_DISABLE);
1482         POSTING_READ(VDECCLK_GATE_D);
1483
1484         pci_write_config_byte(dev->pdev, I915_GDRST, 0);
1485
1486         return 0;
1487 }
1488
1489 static int ironlake_do_reset(struct drm_device *dev, unsigned engine_mask)
1490 {
1491         struct drm_i915_private *dev_priv = dev->dev_private;
1492         int ret;
1493
1494         I915_WRITE(ILK_GDSR,
1495                    ILK_GRDOM_RENDER | ILK_GRDOM_RESET_ENABLE);
1496         ret = wait_for((I915_READ(ILK_GDSR) &
1497                         ILK_GRDOM_RESET_ENABLE) == 0, 500);
1498         if (ret)
1499                 return ret;
1500
1501         I915_WRITE(ILK_GDSR,
1502                    ILK_GRDOM_MEDIA | ILK_GRDOM_RESET_ENABLE);
1503         ret = wait_for((I915_READ(ILK_GDSR) &
1504                         ILK_GRDOM_RESET_ENABLE) == 0, 500);
1505         if (ret)
1506                 return ret;
1507
1508         I915_WRITE(ILK_GDSR, 0);
1509
1510         return 0;
1511 }
1512
1513 /* Reset the hardware domains (GENX_GRDOM_*) specified by mask */
1514 static int gen6_hw_domain_reset(struct drm_i915_private *dev_priv,
1515                                 u32 hw_domain_mask)
1516 {
1517         int ret;
1518
1519         /* GEN6_GDRST is not in the gt power well, no need to check
1520          * for fifo space for the write or forcewake the chip for
1521          * the read
1522          */
1523         __raw_i915_write32(dev_priv, GEN6_GDRST, hw_domain_mask);
1524
1525 #define ACKED ((__raw_i915_read32(dev_priv, GEN6_GDRST) & hw_domain_mask) == 0)
1526         /* Spin waiting for the device to ack the reset requests */
1527         ret = wait_for(ACKED, 500);
1528 #undef ACKED
1529
1530         return ret;
1531 }
1532
1533 /**
1534  * gen6_reset_engines - reset individual engines
1535  * @dev: DRM device
1536  * @engine_mask: mask of intel_ring_flag() engines or ALL_ENGINES for full reset
1537  *
1538  * This function will reset the individual engines that are set in engine_mask.
1539  * If you provide ALL_ENGINES as mask, full global domain reset will be issued.
1540  *
1541  * Note: It is responsibility of the caller to handle the difference between
1542  * asking full domain reset versus reset for all available individual engines.
1543  *
1544  * Returns 0 on success, nonzero on error.
1545  */
1546 static int gen6_reset_engines(struct drm_device *dev, unsigned engine_mask)
1547 {
1548         struct drm_i915_private *dev_priv = dev->dev_private;
1549         struct intel_engine_cs *engine;
1550         const u32 hw_engine_mask[I915_NUM_ENGINES] = {
1551                 [RCS] = GEN6_GRDOM_RENDER,
1552                 [BCS] = GEN6_GRDOM_BLT,
1553                 [VCS] = GEN6_GRDOM_MEDIA,
1554                 [VCS2] = GEN8_GRDOM_MEDIA2,
1555                 [VECS] = GEN6_GRDOM_VECS,
1556         };
1557         u32 hw_mask;
1558         int ret;
1559
1560         if (engine_mask == ALL_ENGINES) {
1561                 hw_mask = GEN6_GRDOM_FULL;
1562         } else {
1563                 hw_mask = 0;
1564                 for_each_engine_masked(engine, dev_priv, engine_mask)
1565                         hw_mask |= hw_engine_mask[engine->id];
1566         }
1567
1568         ret = gen6_hw_domain_reset(dev_priv, hw_mask);
1569
1570         intel_uncore_forcewake_reset(dev, true);
1571
1572         return ret;
1573 }
1574
1575 static int wait_for_register_fw(struct drm_i915_private *dev_priv,
1576                                 i915_reg_t reg,
1577                                 const u32 mask,
1578                                 const u32 value,
1579                                 const unsigned long timeout_ms)
1580 {
1581         return wait_for((I915_READ_FW(reg) & mask) == value, timeout_ms);
1582 }
1583
1584 static int gen8_request_engine_reset(struct intel_engine_cs *engine)
1585 {
1586         int ret;
1587         struct drm_i915_private *dev_priv = engine->dev->dev_private;
1588
1589         I915_WRITE_FW(RING_RESET_CTL(engine->mmio_base),
1590                       _MASKED_BIT_ENABLE(RESET_CTL_REQUEST_RESET));
1591
1592         ret = wait_for_register_fw(dev_priv,
1593                                    RING_RESET_CTL(engine->mmio_base),
1594                                    RESET_CTL_READY_TO_RESET,
1595                                    RESET_CTL_READY_TO_RESET,
1596                                    700);
1597         if (ret)
1598                 DRM_ERROR("%s: reset request timeout\n", engine->name);
1599
1600         return ret;
1601 }
1602
1603 static void gen8_unrequest_engine_reset(struct intel_engine_cs *engine)
1604 {
1605         struct drm_i915_private *dev_priv = engine->dev->dev_private;
1606
1607         I915_WRITE_FW(RING_RESET_CTL(engine->mmio_base),
1608                       _MASKED_BIT_DISABLE(RESET_CTL_REQUEST_RESET));
1609 }
1610
1611 static int gen8_reset_engines(struct drm_device *dev, unsigned engine_mask)
1612 {
1613         struct drm_i915_private *dev_priv = dev->dev_private;
1614         struct intel_engine_cs *engine;
1615
1616         for_each_engine_masked(engine, dev_priv, engine_mask)
1617                 if (gen8_request_engine_reset(engine))
1618                         goto not_ready;
1619
1620         return gen6_reset_engines(dev, engine_mask);
1621
1622 not_ready:
1623         for_each_engine_masked(engine, dev_priv, engine_mask)
1624                 gen8_unrequest_engine_reset(engine);
1625
1626         return -EIO;
1627 }
1628
1629 static int (*intel_get_gpu_reset(struct drm_device *dev))(struct drm_device *,
1630                                                           unsigned engine_mask)
1631 {
1632         if (!i915.reset)
1633                 return NULL;
1634
1635         if (INTEL_INFO(dev)->gen >= 8)
1636                 return gen8_reset_engines;
1637         else if (INTEL_INFO(dev)->gen >= 6)
1638                 return gen6_reset_engines;
1639         else if (IS_GEN5(dev))
1640                 return ironlake_do_reset;
1641         else if (IS_G4X(dev))
1642                 return g4x_do_reset;
1643         else if (IS_G33(dev))
1644                 return g33_do_reset;
1645         else if (INTEL_INFO(dev)->gen >= 3)
1646                 return i915_do_reset;
1647         else
1648                 return NULL;
1649 }
1650
1651 int intel_gpu_reset(struct drm_device *dev, unsigned engine_mask)
1652 {
1653         struct drm_i915_private *dev_priv = to_i915(dev);
1654         int (*reset)(struct drm_device *, unsigned);
1655         int ret;
1656
1657         reset = intel_get_gpu_reset(dev);
1658         if (reset == NULL)
1659                 return -ENODEV;
1660
1661         /* If the power well sleeps during the reset, the reset
1662          * request may be dropped and never completes (causing -EIO).
1663          */
1664         intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
1665         ret = reset(dev, engine_mask);
1666         intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
1667
1668         return ret;
1669 }
1670
1671 bool intel_has_gpu_reset(struct drm_device *dev)
1672 {
1673         return intel_get_gpu_reset(dev) != NULL;
1674 }
1675
1676 int intel_guc_reset(struct drm_i915_private *dev_priv)
1677 {
1678         int ret;
1679         unsigned long irqflags;
1680
1681         if (!i915.enable_guc_submission)
1682                 return -EINVAL;
1683
1684         intel_uncore_forcewake_get(dev_priv, FORCEWAKE_ALL);
1685         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
1686
1687         ret = gen6_hw_domain_reset(dev_priv, GEN9_GRDOM_GUC);
1688
1689         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
1690         intel_uncore_forcewake_put(dev_priv, FORCEWAKE_ALL);
1691
1692         return ret;
1693 }
1694
1695 bool intel_uncore_unclaimed_mmio(struct drm_i915_private *dev_priv)
1696 {
1697         return check_for_unclaimed_mmio(dev_priv);
1698 }
1699
1700 bool
1701 intel_uncore_arm_unclaimed_mmio_detection(struct drm_i915_private *dev_priv)
1702 {
1703         if (unlikely(i915.mmio_debug ||
1704                      dev_priv->uncore.unclaimed_mmio_check <= 0))
1705                 return false;
1706
1707         if (unlikely(intel_uncore_unclaimed_mmio(dev_priv))) {
1708                 DRM_DEBUG("Unclaimed register detected, "
1709                           "enabling oneshot unclaimed register reporting. "
1710                           "Please use i915.mmio_debug=N for more information.\n");
1711                 i915.mmio_debug++;
1712                 dev_priv->uncore.unclaimed_mmio_check--;
1713                 return true;
1714         }
1715
1716         return false;
1717 }