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 2
  31
  32 #define __raw_i915_read8(dev_priv__, reg__) readb((dev_priv__)->regs + (reg__))
  33 #define __raw_i915_write8(dev_priv__, reg__, val__) writeb(val__, (dev_priv__)->regs + (reg__))
  34
  35 #define __raw_i915_read16(dev_priv__, reg__) readw((dev_priv__)->regs + (reg__))
  36 #define __raw_i915_write16(dev_priv__, reg__, val__) writew(val__, (dev_priv__)->regs + (reg__))
  37
  38 #define __raw_i915_read32(dev_priv__, reg__) readl((dev_priv__)->regs + (reg__))
  39 #define __raw_i915_write32(dev_priv__, reg__, val__) writel(val__, (dev_priv__)->regs + (reg__))
  40
  41 #define __raw_i915_read64(dev_priv__, reg__) readq((dev_priv__)->regs + (reg__))
  42 #define __raw_i915_write64(dev_priv__, reg__, val__) writeq(val__, (dev_priv__)->regs + (reg__))
  43
  44 #define __raw_posting_read(dev_priv__, reg__) (void)__raw_i915_read32(dev_priv__, reg__)
  45
  46 static const char * const forcewake_domain_names[] = {
  47         "render",
  48         "blitter",
  49         "media",
  50 };
  51
  52 const char *
  53 intel_uncore_forcewake_domain_to_str(const enum forcewake_domain_id id)
  54 {
  55         BUILD_BUG_ON((sizeof(forcewake_domain_names)/sizeof(const char *)) !=
  56                      FW_DOMAIN_ID_COUNT);
  57
  58         if (id >= 0 && id < FW_DOMAIN_ID_COUNT)
  59                 return forcewake_domain_names[id];
  60
  61         WARN_ON(id);
  62
  63         return "unknown";
  64 }
  65
  66 static void
  67 assert_device_not_suspended(struct drm_i915_private *dev_priv)
  68 {
  69         WARN_ONCE(HAS_RUNTIME_PM(dev_priv->dev) && dev_priv->pm.suspended,
  70                   "Device suspended\n");
  71 }
  72
  73 static inline void
  74 fw_domain_reset(const struct intel_uncore_forcewake_domain *d)
  75 {
  76         WARN_ON(d->reg_set == 0);
  77         __raw_i915_write32(d->i915, d->reg_set, d->val_reset);
  78 }
  79
  80 static inline void
  81 fw_domain_arm_timer(struct intel_uncore_forcewake_domain *d)
  82 {
  83         mod_timer_pinned(&d->timer, jiffies + 1);
  84 }
  85
  86 static inline void
  87 fw_domain_wait_ack_clear(const struct intel_uncore_forcewake_domain *d)
  88 {
  89         if (wait_for_atomic((__raw_i915_read32(d->i915, d->reg_ack) &
  90                              FORCEWAKE_KERNEL) == 0,
  91                             FORCEWAKE_ACK_TIMEOUT_MS))
  92                 DRM_ERROR("%s: timed out waiting for forcewake ack to clear.\n",
  93                           intel_uncore_forcewake_domain_to_str(d->id));
  94 }
  95
  96 static inline void
  97 fw_domain_get(const struct intel_uncore_forcewake_domain *d)
  98 {
  99         __raw_i915_write32(d->i915, d->reg_set, d->val_set);
 100 }
 101
 102 static inline void
 103 fw_domain_wait_ack(const struct intel_uncore_forcewake_domain *d)
 104 {
 105         if (wait_for_atomic((__raw_i915_read32(d->i915, d->reg_ack) &
 106                              FORCEWAKE_KERNEL),
 107                             FORCEWAKE_ACK_TIMEOUT_MS))
 108                 DRM_ERROR("%s: timed out waiting for forcewake ack request.\n",
 109                           intel_uncore_forcewake_domain_to_str(d->id));
 110 }
 111
 112 static inline void
 113 fw_domain_put(const struct intel_uncore_forcewake_domain *d)
 114 {
 115         __raw_i915_write32(d->i915, d->reg_set, d->val_clear);
 116 }
 117
 118 static inline void
 119 fw_domain_posting_read(const struct intel_uncore_forcewake_domain *d)
 120 {
 121         /* something from same cacheline, but not from the set register */
 122         if (d->reg_post)
 123                 __raw_posting_read(d->i915, d->reg_post);
 124 }
 125
 126 static void
 127 fw_domains_get(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains)
 128 {
 129         struct intel_uncore_forcewake_domain *d;
 130         enum forcewake_domain_id id;
 131
 132         for_each_fw_domain_mask(d, fw_domains, dev_priv, id) {
 133                 fw_domain_wait_ack_clear(d);
 134                 fw_domain_get(d);
 135                 fw_domain_wait_ack(d);
 136         }
 137 }
 138
 139 static void
 140 fw_domains_put(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains)
 141 {
 142         struct intel_uncore_forcewake_domain *d;
 143         enum forcewake_domain_id id;
 144
 145         for_each_fw_domain_mask(d, fw_domains, dev_priv, id) {
 146                 fw_domain_put(d);
 147                 fw_domain_posting_read(d);
 148         }
 149 }
 150
 151 static void
 152 fw_domains_posting_read(struct drm_i915_private *dev_priv)
 153 {
 154         struct intel_uncore_forcewake_domain *d;
 155         enum forcewake_domain_id id;
 156
 157         /* No need to do for all, just do for first found */
 158         for_each_fw_domain(d, dev_priv, id) {
 159                 fw_domain_posting_read(d);
 160                 break;
 161         }
 162 }
 163
 164 static void
 165 fw_domains_reset(struct drm_i915_private *dev_priv, enum forcewake_domains fw_domains)
 166 {
 167         struct intel_uncore_forcewake_domain *d;
 168         enum forcewake_domain_id id;
 169
 170         if (dev_priv->uncore.fw_domains == 0)
 171                 return;
 172
 173         for_each_fw_domain_mask(d, fw_domains, dev_priv, id)
 174                 fw_domain_reset(d);
 175
 176         fw_domains_posting_read(dev_priv);
 177 }
 178
 179 static void __gen6_gt_wait_for_thread_c0(struct drm_i915_private *dev_priv)
 180 {
 181         /* w/a for a sporadic read returning 0 by waiting for the GT
 182          * thread to wake up.
 183          */
 184         if (wait_for_atomic_us((__raw_i915_read32(dev_priv, GEN6_GT_THREAD_STATUS_REG) &
 185                                 GEN6_GT_THREAD_STATUS_CORE_MASK) == 0, 500))
 186                 DRM_ERROR("GT thread status wait timed out\n");
 187 }
 188
 189 static void fw_domains_get_with_thread_status(struct drm_i915_private *dev_priv,
 190                                               enum forcewake_domains fw_domains)
 191 {
 192         fw_domains_get(dev_priv, fw_domains);
 193
 194         /* WaRsForcewakeWaitTC0:snb,ivb,hsw,bdw,vlv */
 195         __gen6_gt_wait_for_thread_c0(dev_priv);
 196 }
 197
 198 static void gen6_gt_check_fifodbg(struct drm_i915_private *dev_priv)
 199 {
 200         u32 gtfifodbg;
 201
 202         gtfifodbg = __raw_i915_read32(dev_priv, GTFIFODBG);
 203         if (WARN(gtfifodbg, "GT wake FIFO error 0x%x\n", gtfifodbg))
 204                 __raw_i915_write32(dev_priv, GTFIFODBG, gtfifodbg);
 205 }
 206
 207 static void fw_domains_put_with_fifo(struct drm_i915_private *dev_priv,
 208                                      enum forcewake_domains fw_domains)
 209 {
 210         fw_domains_put(dev_priv, fw_domains);
 211         gen6_gt_check_fifodbg(dev_priv);
 212 }
 213
 214 static inline u32 fifo_free_entries(struct drm_i915_private *dev_priv)
 215 {
 216         u32 count = __raw_i915_read32(dev_priv, GTFIFOCTL);
 217
 218         return count & GT_FIFO_FREE_ENTRIES_MASK;
 219 }
 220
 221 static int __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv)
 222 {
 223         int ret = 0;
 224
 225         /* On VLV, FIFO will be shared by both SW and HW.
 226          * So, we need to read the FREE_ENTRIES everytime */
 227         if (IS_VALLEYVIEW(dev_priv->dev))
 228                 dev_priv->uncore.fifo_count = fifo_free_entries(dev_priv);
 229
 230         if (dev_priv->uncore.fifo_count < GT_FIFO_NUM_RESERVED_ENTRIES) {
 231                 int loop = 500;
 232                 u32 fifo = fifo_free_entries(dev_priv);
 233
 234                 while (fifo <= GT_FIFO_NUM_RESERVED_ENTRIES && loop--) {
 235                         udelay(10);
 236                         fifo = fifo_free_entries(dev_priv);
 237                 }
 238                 if (WARN_ON(loop < 0 && fifo <= GT_FIFO_NUM_RESERVED_ENTRIES))
 239                         ++ret;
 240                 dev_priv->uncore.fifo_count = fifo;
 241         }
 242         dev_priv->uncore.fifo_count--;
 243
 244         return ret;
 245 }
 246
 247 static void intel_uncore_fw_release_timer(unsigned long arg)
 248 {
 249         struct intel_uncore_forcewake_domain *domain = (void *)arg;
 250         unsigned long irqflags;
 251
 252         assert_device_not_suspended(domain->i915);
 253
 254         spin_lock_irqsave(&domain->i915->uncore.lock, irqflags);
 255         if (WARN_ON(domain->wake_count == 0))
 256                 domain->wake_count++;
 257
 258         if (--domain->wake_count == 0)
 259                 domain->i915->uncore.funcs.force_wake_put(domain->i915,
 260                                                           1 << domain->id);
 261
 262         spin_unlock_irqrestore(&domain->i915->uncore.lock, irqflags);
 263 }
 264
 265 void intel_uncore_forcewake_reset(struct drm_device *dev, bool restore)
 266 {
 267         struct drm_i915_private *dev_priv = dev->dev_private;
 268         unsigned long irqflags;
 269         struct intel_uncore_forcewake_domain *domain;
 270         int retry_count = 100;
 271         enum forcewake_domain_id id;
 272         enum forcewake_domains fw = 0, active_domains;
 273
 274         /* Hold uncore.lock across reset to prevent any register access
 275          * with forcewake not set correctly. Wait until all pending
 276          * timers are run before holding.
 277          */
 278         while (1) {
 279                 active_domains = 0;
 280
 281                 for_each_fw_domain(domain, dev_priv, id) {
 282                         if (del_timer_sync(&domain->timer) == 0)
 283                                 continue;
 284
 285                         intel_uncore_fw_release_timer((unsigned long)domain);
 286                 }
 287
 288                 spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 289
 290                 for_each_fw_domain(domain, dev_priv, id) {
 291                         if (timer_pending(&domain->timer))
 292                                 active_domains |= (1 << id);
 293                 }
 294
 295                 if (active_domains == 0)
 296                         break;
 297
 298                 if (--retry_count == 0) {
 299                         DRM_ERROR("Timed out waiting for forcewake timers to finish\n");
 300                         break;
 301                 }
 302
 303                 spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 304                 cond_resched();
 305         }
 306
 307         WARN_ON(active_domains);
 308
 309         for_each_fw_domain(domain, dev_priv, id)
 310                 if (domain->wake_count)
 311                         fw |= 1 << id;
 312
 313         if (fw)
 314                 dev_priv->uncore.funcs.force_wake_put(dev_priv, fw);
 315
 316         fw_domains_reset(dev_priv, FORCEWAKE_ALL);
 317
 318         if (restore) { /* If reset with a user forcewake, try to restore */
 319                 if (fw)
 320                         dev_priv->uncore.funcs.force_wake_get(dev_priv, fw);
 321
 322                 if (IS_GEN6(dev) || IS_GEN7(dev))
 323                         dev_priv->uncore.fifo_count =
 324                                 fifo_free_entries(dev_priv);
 325         }
 326
 327         if (!restore)
 328                 assert_forcewakes_inactive(dev_priv);
 329
 330         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 331 }
 332
 333 static void intel_uncore_ellc_detect(struct drm_device *dev)
 334 {
 335         struct drm_i915_private *dev_priv = dev->dev_private;
 336
 337         if ((IS_HASWELL(dev) || IS_BROADWELL(dev) ||
 338              INTEL_INFO(dev)->gen >= 9) &&
 339             (__raw_i915_read32(dev_priv, HSW_EDRAM_PRESENT) & EDRAM_ENABLED)) {
 340                 /* The docs do not explain exactly how the calculation can be
 341                  * made. It is somewhat guessable, but for now, it's always
 342                  * 128MB.
 343                  * NB: We can't write IDICR yet because we do not have gt funcs
 344                  * set up */
 345                 dev_priv->ellc_size = 128;
 346                 DRM_INFO("Found %zuMB of eLLC\n", dev_priv->ellc_size);
 347         }
 348 }
 349
 350 static void __intel_uncore_early_sanitize(struct drm_device *dev,
 351                                           bool restore_forcewake)
 352 {
 353         struct drm_i915_private *dev_priv = dev->dev_private;
 354
 355         if (HAS_FPGA_DBG_UNCLAIMED(dev))
 356                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 357
 358         /* clear out old GT FIFO errors */
 359         if (IS_GEN6(dev) || IS_GEN7(dev))
 360                 __raw_i915_write32(dev_priv, GTFIFODBG,
 361                                    __raw_i915_read32(dev_priv, GTFIFODBG));
 362
 363         /* WaDisableShadowRegForCpd:chv */
 364         if (IS_CHERRYVIEW(dev)) {
 365                 __raw_i915_write32(dev_priv, GTFIFOCTL,
 366                                    __raw_i915_read32(dev_priv, GTFIFOCTL) |
 367                                    GT_FIFO_CTL_BLOCK_ALL_POLICY_STALL |
 368                                    GT_FIFO_CTL_RC6_POLICY_STALL);
 369         }
 370
 371         intel_uncore_forcewake_reset(dev, restore_forcewake);
 372 }
 373
 374 void intel_uncore_early_sanitize(struct drm_device *dev, bool restore_forcewake)
 375 {
 376         __intel_uncore_early_sanitize(dev, restore_forcewake);
 377         i915_check_and_clear_faults(dev);
 378 }
 379
 380 void intel_uncore_sanitize(struct drm_device *dev)
 381 {
 382         /* BIOS often leaves RC6 enabled, but disable it for hw init */
 383         intel_disable_gt_powersave(dev);
 384 }
 385
 386 /**
 387  * intel_uncore_forcewake_get - grab forcewake domain references
 388  * @dev_priv: i915 device instance
 389  * @fw_domains: forcewake domains to get reference on
 390  *
 391  * This function can be used get GT's forcewake domain references.
 392  * Normal register access will handle the forcewake domains automatically.
 393  * However if some sequence requires the GT to not power down a particular
 394  * forcewake domains this function should be called at the beginning of the
 395  * sequence. And subsequently the reference should be dropped by symmetric
 396  * call to intel_unforce_forcewake_put(). Usually caller wants all the domains
 397  * to be kept awake so the @fw_domains would be then FORCEWAKE_ALL.
 398  */
 399 void intel_uncore_forcewake_get(struct drm_i915_private *dev_priv,
 400                                 enum forcewake_domains fw_domains)
 401 {
 402         unsigned long irqflags;
 403         struct intel_uncore_forcewake_domain *domain;
 404         enum forcewake_domain_id id;
 405
 406         if (!dev_priv->uncore.funcs.force_wake_get)
 407                 return;
 408
 409         WARN_ON(dev_priv->pm.suspended);
 410
 411         fw_domains &= dev_priv->uncore.fw_domains;
 412
 413         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 414
 415         for_each_fw_domain_mask(domain, fw_domains, dev_priv, id) {
 416                 if (domain->wake_count++)
 417                         fw_domains &= ~(1 << id);
 418         }
 419
 420         if (fw_domains)
 421                 dev_priv->uncore.funcs.force_wake_get(dev_priv, fw_domains);
 422
 423         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 424 }
 425
 426 /**
 427  * intel_uncore_forcewake_put - release a forcewake domain reference
 428  * @dev_priv: i915 device instance
 429  * @fw_domains: forcewake domains to put references
 430  *
 431  * This function drops the device-level forcewakes for specified
 432  * domains obtained by intel_uncore_forcewake_get().
 433  */
 434 void intel_uncore_forcewake_put(struct drm_i915_private *dev_priv,
 435                                 enum forcewake_domains fw_domains)
 436 {
 437         unsigned long irqflags;
 438         struct intel_uncore_forcewake_domain *domain;
 439         enum forcewake_domain_id id;
 440
 441         if (!dev_priv->uncore.funcs.force_wake_put)
 442                 return;
 443
 444         fw_domains &= dev_priv->uncore.fw_domains;
 445
 446         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 447
 448         for_each_fw_domain_mask(domain, fw_domains, dev_priv, id) {
 449                 if (WARN_ON(domain->wake_count == 0))
 450                         continue;
 451
 452                 if (--domain->wake_count)
 453                         continue;
 454
 455                 domain->wake_count++;
 456                 fw_domain_arm_timer(domain);
 457         }
 458
 459         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 460 }
 461
 462 void assert_forcewakes_inactive(struct drm_i915_private *dev_priv)
 463 {
 464         struct intel_uncore_forcewake_domain *domain;
 465         enum forcewake_domain_id id;
 466
 467         if (!dev_priv->uncore.funcs.force_wake_get)
 468                 return;
 469
 470         for_each_fw_domain(domain, dev_priv, id)
 471                 WARN_ON(domain->wake_count);
 472 }
 473
 474 /* We give fast paths for the really cool registers */
 475 #define NEEDS_FORCE_WAKE(dev_priv, reg) \
 476          ((reg) < 0x40000 && (reg) != FORCEWAKE)
 477
 478 #define REG_RANGE(reg, start, end) ((reg) >= (start) && (reg) < (end))
 479
 480 #define FORCEWAKE_VLV_RENDER_RANGE_OFFSET(reg) \
 481         (REG_RANGE((reg), 0x2000, 0x4000) || \
 482          REG_RANGE((reg), 0x5000, 0x8000) || \
 483          REG_RANGE((reg), 0xB000, 0x12000) || \
 484          REG_RANGE((reg), 0x2E000, 0x30000))
 485
 486 #define FORCEWAKE_VLV_MEDIA_RANGE_OFFSET(reg) \
 487         (REG_RANGE((reg), 0x12000, 0x14000) || \
 488          REG_RANGE((reg), 0x22000, 0x24000) || \
 489          REG_RANGE((reg), 0x30000, 0x40000))
 490
 491 #define FORCEWAKE_CHV_RENDER_RANGE_OFFSET(reg) \
 492         (REG_RANGE((reg), 0x2000, 0x4000) || \
 493          REG_RANGE((reg), 0x5200, 0x8000) || \
 494          REG_RANGE((reg), 0x8300, 0x8500) || \
 495          REG_RANGE((reg), 0xB000, 0xB480) || \
 496          REG_RANGE((reg), 0xE000, 0xE800))
 497
 498 #define FORCEWAKE_CHV_MEDIA_RANGE_OFFSET(reg) \
 499         (REG_RANGE((reg), 0x8800, 0x8900) || \
 500          REG_RANGE((reg), 0xD000, 0xD800) || \
 501          REG_RANGE((reg), 0x12000, 0x14000) || \
 502          REG_RANGE((reg), 0x1A000, 0x1C000) || \
 503          REG_RANGE((reg), 0x1E800, 0x1EA00) || \
 504          REG_RANGE((reg), 0x30000, 0x38000))
 505
 506 #define FORCEWAKE_CHV_COMMON_RANGE_OFFSET(reg) \
 507         (REG_RANGE((reg), 0x4000, 0x5000) || \
 508          REG_RANGE((reg), 0x8000, 0x8300) || \
 509          REG_RANGE((reg), 0x8500, 0x8600) || \
 510          REG_RANGE((reg), 0x9000, 0xB000) || \
 511          REG_RANGE((reg), 0xF000, 0x10000))
 512
 513 #define FORCEWAKE_GEN9_UNCORE_RANGE_OFFSET(reg) \
 514         REG_RANGE((reg), 0xB00,  0x2000)
 515
 516 #define FORCEWAKE_GEN9_RENDER_RANGE_OFFSET(reg) \
 517         (REG_RANGE((reg), 0x2000, 0x2700) || \
 518          REG_RANGE((reg), 0x3000, 0x4000) || \
 519          REG_RANGE((reg), 0x5200, 0x8000) || \
 520          REG_RANGE((reg), 0x8140, 0x8160) || \
 521          REG_RANGE((reg), 0x8300, 0x8500) || \
 522          REG_RANGE((reg), 0x8C00, 0x8D00) || \
 523          REG_RANGE((reg), 0xB000, 0xB480) || \
 524          REG_RANGE((reg), 0xE000, 0xE900) || \
 525          REG_RANGE((reg), 0x24400, 0x24800))
 526
 527 #define FORCEWAKE_GEN9_MEDIA_RANGE_OFFSET(reg) \
 528         (REG_RANGE((reg), 0x8130, 0x8140) || \
 529          REG_RANGE((reg), 0x8800, 0x8A00) || \
 530          REG_RANGE((reg), 0xD000, 0xD800) || \
 531          REG_RANGE((reg), 0x12000, 0x14000) || \
 532          REG_RANGE((reg), 0x1A000, 0x1EA00) || \
 533          REG_RANGE((reg), 0x30000, 0x40000))
 534
 535 #define FORCEWAKE_GEN9_COMMON_RANGE_OFFSET(reg) \
 536         REG_RANGE((reg), 0x9400, 0x9800)
 537
 538 #define FORCEWAKE_GEN9_BLITTER_RANGE_OFFSET(reg) \
 539         ((reg) < 0x40000 &&\
 540          !FORCEWAKE_GEN9_UNCORE_RANGE_OFFSET(reg) && \
 541          !FORCEWAKE_GEN9_RENDER_RANGE_OFFSET(reg) && \
 542          !FORCEWAKE_GEN9_MEDIA_RANGE_OFFSET(reg) && \
 543          !FORCEWAKE_GEN9_COMMON_RANGE_OFFSET(reg))
 544
 545 static void
 546 ilk_dummy_write(struct drm_i915_private *dev_priv)
 547 {
 548         /* WaIssueDummyWriteToWakeupFromRC6:ilk Issue a dummy write to wake up
 549          * the chip from rc6 before touching it for real. MI_MODE is masked,
 550          * hence harmless to write 0 into. */
 551         __raw_i915_write32(dev_priv, MI_MODE, 0);
 552 }
 553
 554 static void
 555 hsw_unclaimed_reg_debug(struct drm_i915_private *dev_priv, u32 reg, bool read,
 556                         bool before)
 557 {
 558         const char *op = read ? "reading" : "writing to";
 559         const char *when = before ? "before" : "after";
 560
 561         if (!i915.mmio_debug)
 562                 return;
 563
 564         if (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM) {
 565                 WARN(1, "Unclaimed register detected %s %s register 0x%x\n",
 566                      when, op, reg);
 567                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 568                 i915.mmio_debug--; /* Only report the first N failures */
 569         }
 570 }
 571
 572 static void
 573 hsw_unclaimed_reg_detect(struct drm_i915_private *dev_priv)
 574 {
 575         static bool mmio_debug_once = true;
 576
 577         if (i915.mmio_debug || !mmio_debug_once)
 578                 return;
 579
 580         if (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM) {
 581                 DRM_DEBUG("Unclaimed register detected, "
 582                           "enabling oneshot unclaimed register reporting. "
 583                           "Please use i915.mmio_debug=N for more information.\n");
 584                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 585                 i915.mmio_debug = mmio_debug_once--;
 586         }
 587 }
 588
 589 #define GEN2_READ_HEADER(x) \
 590         u##x val = 0; \
 591         assert_device_not_suspended(dev_priv);
 592
 593 #define GEN2_READ_FOOTER \
 594         trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \
 595         return val
 596
 597 #define __gen2_read(x) \
 598 static u##x \
 599 gen2_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
 600         GEN2_READ_HEADER(x); \
 601         val = __raw_i915_read##x(dev_priv, reg); \
 602         GEN2_READ_FOOTER; \
 603 }
 604
 605 #define __gen5_read(x) \
 606 static u##x \
 607 gen5_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
 608         GEN2_READ_HEADER(x); \
 609         ilk_dummy_write(dev_priv); \
 610         val = __raw_i915_read##x(dev_priv, reg); \
 611         GEN2_READ_FOOTER; \
 612 }
 613
 614 __gen5_read(8)
 615 __gen5_read(16)
 616 __gen5_read(32)
 617 __gen5_read(64)
 618 __gen2_read(8)
 619 __gen2_read(16)
 620 __gen2_read(32)
 621 __gen2_read(64)
 622
 623 #undef __gen5_read
 624 #undef __gen2_read
 625
 626 #undef GEN2_READ_FOOTER
 627 #undef GEN2_READ_HEADER
 628
 629 #define GEN6_READ_HEADER(x) \
 630         unsigned long irqflags; \
 631         u##x val = 0; \
 632         assert_device_not_suspended(dev_priv); \
 633         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags)
 634
 635 #define GEN6_READ_FOOTER \
 636         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
 637         trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \
 638         return val
 639
 640 static inline void __force_wake_get(struct drm_i915_private *dev_priv,
 641                                     enum forcewake_domains fw_domains)
 642 {
 643         struct intel_uncore_forcewake_domain *domain;
 644         enum forcewake_domain_id id;
 645
 646         if (WARN_ON(!fw_domains))
 647                 return;
 648
 649         /* Ideally GCC would be constant-fold and eliminate this loop */
 650         for_each_fw_domain_mask(domain, fw_domains, dev_priv, id) {
 651                 if (domain->wake_count) {
 652                         fw_domains &= ~(1 << id);
 653                         continue;
 654                 }
 655
 656                 domain->wake_count++;
 657                 fw_domain_arm_timer(domain);
 658         }
 659
 660         if (fw_domains)
 661                 dev_priv->uncore.funcs.force_wake_get(dev_priv, fw_domains);
 662 }
 663
 664 #define __vgpu_read(x) \
 665 static u##x \
 666 vgpu_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
 667         GEN6_READ_HEADER(x); \
 668         val = __raw_i915_read##x(dev_priv, reg); \
 669         GEN6_READ_FOOTER; \
 670 }
 671
 672 #define __gen6_read(x) \
 673 static u##x \
 674 gen6_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
 675         GEN6_READ_HEADER(x); \
 676         hsw_unclaimed_reg_debug(dev_priv, reg, true, true); \
 677         if (NEEDS_FORCE_WAKE((dev_priv), (reg))) \
 678                 __force_wake_get(dev_priv, FORCEWAKE_RENDER); \
 679         val = __raw_i915_read##x(dev_priv, reg); \
 680         hsw_unclaimed_reg_debug(dev_priv, reg, true, false); \
 681         GEN6_READ_FOOTER; \
 682 }
 683
 684 #define __vlv_read(x) \
 685 static u##x \
 686 vlv_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
 687         GEN6_READ_HEADER(x); \
 688         if (FORCEWAKE_VLV_RENDER_RANGE_OFFSET(reg)) \
 689                 __force_wake_get(dev_priv, FORCEWAKE_RENDER); \
 690         else if (FORCEWAKE_VLV_MEDIA_RANGE_OFFSET(reg)) \
 691                 __force_wake_get(dev_priv, FORCEWAKE_MEDIA); \
 692         val = __raw_i915_read##x(dev_priv, reg); \
 693         GEN6_READ_FOOTER; \
 694 }
 695
 696 #define __chv_read(x) \
 697 static u##x \
 698 chv_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
 699         GEN6_READ_HEADER(x); \
 700         if (FORCEWAKE_CHV_RENDER_RANGE_OFFSET(reg)) \
 701                 __force_wake_get(dev_priv, FORCEWAKE_RENDER); \
 702         else if (FORCEWAKE_CHV_MEDIA_RANGE_OFFSET(reg)) \
 703                 __force_wake_get(dev_priv, FORCEWAKE_MEDIA); \
 704         else if (FORCEWAKE_CHV_COMMON_RANGE_OFFSET(reg)) \
 705                 __force_wake_get(dev_priv, \
 706                                  FORCEWAKE_RENDER | FORCEWAKE_MEDIA); \
 707         val = __raw_i915_read##x(dev_priv, reg); \
 708         GEN6_READ_FOOTER; \
 709 }
 710
 711 #define SKL_NEEDS_FORCE_WAKE(dev_priv, reg)     \
 712          ((reg) < 0x40000 && !FORCEWAKE_GEN9_UNCORE_RANGE_OFFSET(reg))
 713
 714 #define __gen9_read(x) \
 715 static u##x \
 716 gen9_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
 717         enum forcewake_domains fw_engine; \
 718         GEN6_READ_HEADER(x); \
 719         if (!SKL_NEEDS_FORCE_WAKE((dev_priv), (reg)))   \
 720                 fw_engine = 0; \
 721         else if (FORCEWAKE_GEN9_RENDER_RANGE_OFFSET(reg))       \
 722                 fw_engine = FORCEWAKE_RENDER; \
 723         else if (FORCEWAKE_GEN9_MEDIA_RANGE_OFFSET(reg)) \
 724                 fw_engine = FORCEWAKE_MEDIA; \
 725         else if (FORCEWAKE_GEN9_COMMON_RANGE_OFFSET(reg)) \
 726                 fw_engine = FORCEWAKE_RENDER | FORCEWAKE_MEDIA; \
 727         else \
 728                 fw_engine = FORCEWAKE_BLITTER; \
 729         if (fw_engine) \
 730                 __force_wake_get(dev_priv, fw_engine); \
 731         val = __raw_i915_read##x(dev_priv, reg); \
 732         GEN6_READ_FOOTER; \
 733 }
 734
 735 __vgpu_read(8)
 736 __vgpu_read(16)
 737 __vgpu_read(32)
 738 __vgpu_read(64)
 739 __gen9_read(8)
 740 __gen9_read(16)
 741 __gen9_read(32)
 742 __gen9_read(64)
 743 __chv_read(8)
 744 __chv_read(16)
 745 __chv_read(32)
 746 __chv_read(64)
 747 __vlv_read(8)
 748 __vlv_read(16)
 749 __vlv_read(32)
 750 __vlv_read(64)
 751 __gen6_read(8)
 752 __gen6_read(16)
 753 __gen6_read(32)
 754 __gen6_read(64)
 755
 756 #undef __gen9_read
 757 #undef __chv_read
 758 #undef __vlv_read
 759 #undef __gen6_read
 760 #undef __vgpu_read
 761 #undef GEN6_READ_FOOTER
 762 #undef GEN6_READ_HEADER
 763
 764 #define GEN2_WRITE_HEADER \
 765         trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \
 766         assert_device_not_suspended(dev_priv); \
 767
 768 #define GEN2_WRITE_FOOTER
 769
 770 #define __gen2_write(x) \
 771 static void \
 772 gen2_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
 773         GEN2_WRITE_HEADER; \
 774         __raw_i915_write##x(dev_priv, reg, val); \
 775         GEN2_WRITE_FOOTER; \
 776 }
 777
 778 #define __gen5_write(x) \
 779 static void \
 780 gen5_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
 781         GEN2_WRITE_HEADER; \
 782         ilk_dummy_write(dev_priv); \
 783         __raw_i915_write##x(dev_priv, reg, val); \
 784         GEN2_WRITE_FOOTER; \
 785 }
 786
 787 __gen5_write(8)
 788 __gen5_write(16)
 789 __gen5_write(32)
 790 __gen5_write(64)
 791 __gen2_write(8)
 792 __gen2_write(16)
 793 __gen2_write(32)
 794 __gen2_write(64)
 795
 796 #undef __gen5_write
 797 #undef __gen2_write
 798
 799 #undef GEN2_WRITE_FOOTER
 800 #undef GEN2_WRITE_HEADER
 801
 802 #define GEN6_WRITE_HEADER \
 803         unsigned long irqflags; \
 804         trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \
 805         assert_device_not_suspended(dev_priv); \
 806         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags)
 807
 808 #define GEN6_WRITE_FOOTER \
 809         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags)
 810
 811 #define __gen6_write(x) \
 812 static void \
 813 gen6_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
 814         u32 __fifo_ret = 0; \
 815         GEN6_WRITE_HEADER; \
 816         if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
 817                 __fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
 818         } \
 819         __raw_i915_write##x(dev_priv, reg, val); \
 820         if (unlikely(__fifo_ret)) { \
 821                 gen6_gt_check_fifodbg(dev_priv); \
 822         } \
 823         GEN6_WRITE_FOOTER; \
 824 }
 825
 826 #define __hsw_write(x) \
 827 static void \
 828 hsw_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
 829         u32 __fifo_ret = 0; \
 830         GEN6_WRITE_HEADER; \
 831         if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
 832                 __fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
 833         } \
 834         hsw_unclaimed_reg_debug(dev_priv, reg, false, true); \
 835         __raw_i915_write##x(dev_priv, reg, val); \
 836         if (unlikely(__fifo_ret)) { \
 837                 gen6_gt_check_fifodbg(dev_priv); \
 838         } \
 839         hsw_unclaimed_reg_debug(dev_priv, reg, false, false); \
 840         hsw_unclaimed_reg_detect(dev_priv); \
 841         GEN6_WRITE_FOOTER; \
 842 }
 843
 844 #define __vgpu_write(x) \
 845 static void vgpu_write##x(struct drm_i915_private *dev_priv, \
 846                           off_t reg, u##x val, bool trace) { \
 847         GEN6_WRITE_HEADER; \
 848         __raw_i915_write##x(dev_priv, reg, val); \
 849         GEN6_WRITE_FOOTER; \
 850 }
 851
 852 static const u32 gen8_shadowed_regs[] = {
 853         FORCEWAKE_MT,
 854         GEN6_RPNSWREQ,
 855         GEN6_RC_VIDEO_FREQ,
 856         RING_TAIL(RENDER_RING_BASE),
 857         RING_TAIL(GEN6_BSD_RING_BASE),
 858         RING_TAIL(VEBOX_RING_BASE),
 859         RING_TAIL(BLT_RING_BASE),
 860         /* TODO: Other registers are not yet used */
 861 };
 862
 863 static bool is_gen8_shadowed(struct drm_i915_private *dev_priv, u32 reg)
 864 {
 865         int i;
 866         for (i = 0; i < ARRAY_SIZE(gen8_shadowed_regs); i++)
 867                 if (reg == gen8_shadowed_regs[i])
 868                         return true;
 869
 870         return false;
 871 }
 872
 873 #define __gen8_write(x) \
 874 static void \
 875 gen8_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
 876         GEN6_WRITE_HEADER; \
 877         hsw_unclaimed_reg_debug(dev_priv, reg, false, true); \
 878         if (reg < 0x40000 && !is_gen8_shadowed(dev_priv, reg)) \
 879                 __force_wake_get(dev_priv, FORCEWAKE_RENDER); \
 880         __raw_i915_write##x(dev_priv, reg, val); \
 881         hsw_unclaimed_reg_debug(dev_priv, reg, false, false); \
 882         hsw_unclaimed_reg_detect(dev_priv); \
 883         GEN6_WRITE_FOOTER; \
 884 }
 885
 886 #define __chv_write(x) \
 887 static void \
 888 chv_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
 889         bool shadowed = is_gen8_shadowed(dev_priv, reg); \
 890         GEN6_WRITE_HEADER; \
 891         if (!shadowed) { \
 892                 if (FORCEWAKE_CHV_RENDER_RANGE_OFFSET(reg)) \
 893                         __force_wake_get(dev_priv, FORCEWAKE_RENDER); \
 894                 else if (FORCEWAKE_CHV_MEDIA_RANGE_OFFSET(reg)) \
 895                         __force_wake_get(dev_priv, FORCEWAKE_MEDIA); \
 896                 else if (FORCEWAKE_CHV_COMMON_RANGE_OFFSET(reg)) \
 897                         __force_wake_get(dev_priv, FORCEWAKE_RENDER | FORCEWAKE_MEDIA); \
 898         } \
 899         __raw_i915_write##x(dev_priv, reg, val); \
 900         GEN6_WRITE_FOOTER; \
 901 }
 902
 903 static const u32 gen9_shadowed_regs[] = {
 904         RING_TAIL(RENDER_RING_BASE),
 905         RING_TAIL(GEN6_BSD_RING_BASE),
 906         RING_TAIL(VEBOX_RING_BASE),
 907         RING_TAIL(BLT_RING_BASE),
 908         FORCEWAKE_BLITTER_GEN9,
 909         FORCEWAKE_RENDER_GEN9,
 910         FORCEWAKE_MEDIA_GEN9,
 911         GEN6_RPNSWREQ,
 912         GEN6_RC_VIDEO_FREQ,
 913         /* TODO: Other registers are not yet used */
 914 };
 915
 916 static bool is_gen9_shadowed(struct drm_i915_private *dev_priv, u32 reg)
 917 {
 918         int i;
 919         for (i = 0; i < ARRAY_SIZE(gen9_shadowed_regs); i++)
 920                 if (reg == gen9_shadowed_regs[i])
 921                         return true;
 922
 923         return false;
 924 }
 925
 926 #define __gen9_write(x) \
 927 static void \
 928 gen9_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, \
 929                 bool trace) { \
 930         enum forcewake_domains fw_engine; \
 931         GEN6_WRITE_HEADER; \
 932         if (!SKL_NEEDS_FORCE_WAKE((dev_priv), (reg)) || \
 933             is_gen9_shadowed(dev_priv, reg)) \
 934                 fw_engine = 0; \
 935         else if (FORCEWAKE_GEN9_RENDER_RANGE_OFFSET(reg)) \
 936                 fw_engine = FORCEWAKE_RENDER; \
 937         else if (FORCEWAKE_GEN9_MEDIA_RANGE_OFFSET(reg)) \
 938                 fw_engine = FORCEWAKE_MEDIA; \
 939         else if (FORCEWAKE_GEN9_COMMON_RANGE_OFFSET(reg)) \
 940                 fw_engine = FORCEWAKE_RENDER | FORCEWAKE_MEDIA; \
 941         else \
 942                 fw_engine = FORCEWAKE_BLITTER; \
 943         if (fw_engine) \
 944                 __force_wake_get(dev_priv, fw_engine); \
 945         __raw_i915_write##x(dev_priv, reg, val); \
 946         GEN6_WRITE_FOOTER; \
 947 }
 948
 949 __gen9_write(8)
 950 __gen9_write(16)
 951 __gen9_write(32)
 952 __gen9_write(64)
 953 __chv_write(8)
 954 __chv_write(16)
 955 __chv_write(32)
 956 __chv_write(64)
 957 __gen8_write(8)
 958 __gen8_write(16)
 959 __gen8_write(32)
 960 __gen8_write(64)
 961 __hsw_write(8)
 962 __hsw_write(16)
 963 __hsw_write(32)
 964 __hsw_write(64)
 965 __gen6_write(8)
 966 __gen6_write(16)
 967 __gen6_write(32)
 968 __gen6_write(64)
 969 __vgpu_write(8)
 970 __vgpu_write(16)
 971 __vgpu_write(32)
 972 __vgpu_write(64)
 973
 974 #undef __gen9_write
 975 #undef __chv_write
 976 #undef __gen8_write
 977 #undef __hsw_write
 978 #undef __gen6_write
 979 #undef __vgpu_write
 980 #undef GEN6_WRITE_FOOTER
 981 #undef GEN6_WRITE_HEADER
 982
 983 #define ASSIGN_WRITE_MMIO_VFUNCS(x) \
 984 do { \
 985         dev_priv->uncore.funcs.mmio_writeb = x##_write8; \
 986         dev_priv->uncore.funcs.mmio_writew = x##_write16; \
 987         dev_priv->uncore.funcs.mmio_writel = x##_write32; \
 988         dev_priv->uncore.funcs.mmio_writeq = x##_write64; \
 989 } while (0)
 990
 991 #define ASSIGN_READ_MMIO_VFUNCS(x) \
 992 do { \
 993         dev_priv->uncore.funcs.mmio_readb = x##_read8; \
 994         dev_priv->uncore.funcs.mmio_readw = x##_read16; \
 995         dev_priv->uncore.funcs.mmio_readl = x##_read32; \
 996         dev_priv->uncore.funcs.mmio_readq = x##_read64; \
 997 } while (0)
 998
 999
1000 static void fw_domain_init(struct drm_i915_private *dev_priv,
1001                            enum forcewake_domain_id domain_id,
1002                            u32 reg_set, u32 reg_ack)
1003 {
1004         struct intel_uncore_forcewake_domain *d;
1005
1006         if (WARN_ON(domain_id >= FW_DOMAIN_ID_COUNT))
1007                 return;
1008
1009         d = &dev_priv->uncore.fw_domain[domain_id];
1010
1011         WARN_ON(d->wake_count);
1012
1013         d->wake_count = 0;
1014         d->reg_set = reg_set;
1015         d->reg_ack = reg_ack;
1016
1017         if (IS_GEN6(dev_priv)) {
1018                 d->val_reset = 0;
1019                 d->val_set = FORCEWAKE_KERNEL;
1020                 d->val_clear = 0;
1021         } else {
1022                 /* WaRsClearFWBitsAtReset:bdw,skl */
1023                 d->val_reset = _MASKED_BIT_DISABLE(0xffff);
1024                 d->val_set = _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL);
1025                 d->val_clear = _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL);
1026         }
1027
1028         if (IS_VALLEYVIEW(dev_priv))
1029                 d->reg_post = FORCEWAKE_ACK_VLV;
1030         else if (IS_GEN6(dev_priv) || IS_GEN7(dev_priv) || IS_GEN8(dev_priv))
1031                 d->reg_post = ECOBUS;
1032         else
1033                 d->reg_post = 0;
1034
1035         d->i915 = dev_priv;
1036         d->id = domain_id;
1037
1038         setup_timer(&d->timer, intel_uncore_fw_release_timer, (unsigned long)d);
1039
1040         dev_priv->uncore.fw_domains |= (1 << domain_id);
1041
1042         fw_domain_reset(d);
1043 }
1044
1045 static void intel_uncore_fw_domains_init(struct drm_device *dev)
1046 {
1047         struct drm_i915_private *dev_priv = dev->dev_private;
1048
1049         if (INTEL_INFO(dev_priv->dev)->gen <= 5)
1050                 return;
1051
1052         if (IS_GEN9(dev)) {
1053                 dev_priv->uncore.funcs.force_wake_get = fw_domains_get;
1054                 dev_priv->uncore.funcs.force_wake_put = fw_domains_put;
1055                 fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER,
1056                                FORCEWAKE_RENDER_GEN9,
1057                                FORCEWAKE_ACK_RENDER_GEN9);
1058                 fw_domain_init(dev_priv, FW_DOMAIN_ID_BLITTER,
1059                                FORCEWAKE_BLITTER_GEN9,
1060                                FORCEWAKE_ACK_BLITTER_GEN9);
1061                 fw_domain_init(dev_priv, FW_DOMAIN_ID_MEDIA,
1062                                FORCEWAKE_MEDIA_GEN9, FORCEWAKE_ACK_MEDIA_GEN9);
1063         } else if (IS_VALLEYVIEW(dev)) {
1064                 dev_priv->uncore.funcs.force_wake_get = fw_domains_get;
1065                 if (!IS_CHERRYVIEW(dev))
1066                         dev_priv->uncore.funcs.force_wake_put =
1067                                 fw_domains_put_with_fifo;
1068                 else
1069                         dev_priv->uncore.funcs.force_wake_put = fw_domains_put;
1070                 fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER,
1071                                FORCEWAKE_VLV, FORCEWAKE_ACK_VLV);
1072                 fw_domain_init(dev_priv, FW_DOMAIN_ID_MEDIA,
1073                                FORCEWAKE_MEDIA_VLV, FORCEWAKE_ACK_MEDIA_VLV);
1074         } else if (IS_HASWELL(dev) || IS_BROADWELL(dev)) {
1075                 dev_priv->uncore.funcs.force_wake_get =
1076                         fw_domains_get_with_thread_status;
1077                 dev_priv->uncore.funcs.force_wake_put = fw_domains_put;
1078                 fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER,
1079                                FORCEWAKE_MT, FORCEWAKE_ACK_HSW);
1080         } else if (IS_IVYBRIDGE(dev)) {
1081                 u32 ecobus;
1082
1083                 /* IVB configs may use multi-threaded forcewake */
1084
1085                 /* A small trick here - if the bios hasn't configured
1086                  * MT forcewake, and if the device is in RC6, then
1087                  * force_wake_mt_get will not wake the device and the
1088                  * ECOBUS read will return zero. Which will be
1089                  * (correctly) interpreted by the test below as MT
1090                  * forcewake being disabled.
1091                  */
1092                 dev_priv->uncore.funcs.force_wake_get =
1093                         fw_domains_get_with_thread_status;
1094                 dev_priv->uncore.funcs.force_wake_put =
1095                         fw_domains_put_with_fifo;
1096
1097                 /* We need to init first for ECOBUS access and then
1098                  * determine later if we want to reinit, in case of MT access is
1099                  * not working. In this stage we don't know which flavour this
1100                  * ivb is, so it is better to reset also the gen6 fw registers
1101                  * before the ecobus check.
1102                  */
1103
1104                 __raw_i915_write32(dev_priv, FORCEWAKE, 0);
1105                 __raw_posting_read(dev_priv, ECOBUS);
1106
1107                 fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER,
1108                                FORCEWAKE_MT, FORCEWAKE_MT_ACK);
1109
1110                 mutex_lock(&dev->struct_mutex);
1111                 fw_domains_get_with_thread_status(dev_priv, FORCEWAKE_ALL);
1112                 ecobus = __raw_i915_read32(dev_priv, ECOBUS);
1113                 fw_domains_put_with_fifo(dev_priv, FORCEWAKE_ALL);
1114                 mutex_unlock(&dev->struct_mutex);
1115
1116                 if (!(ecobus & FORCEWAKE_MT_ENABLE)) {
1117                         DRM_INFO("No MT forcewake available on Ivybridge, this can result in issues\n");
1118                         DRM_INFO("when using vblank-synced partial screen updates.\n");
1119                         fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER,
1120                                        FORCEWAKE, FORCEWAKE_ACK);
1121                 }
1122         } else if (IS_GEN6(dev)) {
1123                 dev_priv->uncore.funcs.force_wake_get =
1124                         fw_domains_get_with_thread_status;
1125                 dev_priv->uncore.funcs.force_wake_put =
1126                         fw_domains_put_with_fifo;
1127                 fw_domain_init(dev_priv, FW_DOMAIN_ID_RENDER,
1128                                FORCEWAKE, FORCEWAKE_ACK);
1129         }
1130
1131         /* All future platforms are expected to require complex power gating */
1132         WARN_ON(dev_priv->uncore.fw_domains == 0);
1133 }
1134
1135 void intel_uncore_init(struct drm_device *dev)
1136 {
1137         struct drm_i915_private *dev_priv = dev->dev_private;
1138
1139         i915_check_vgpu(dev);
1140
1141         intel_uncore_ellc_detect(dev);
1142         intel_uncore_fw_domains_init(dev);
1143         __intel_uncore_early_sanitize(dev, false);
1144
1145         switch (INTEL_INFO(dev)->gen) {
1146         default:
1147                 MISSING_CASE(INTEL_INFO(dev)->gen);
1148                 return;
1149         case 9:
1150                 ASSIGN_WRITE_MMIO_VFUNCS(gen9);
1151                 ASSIGN_READ_MMIO_VFUNCS(gen9);
1152                 break;
1153         case 8:
1154                 if (IS_CHERRYVIEW(dev)) {
1155                         ASSIGN_WRITE_MMIO_VFUNCS(chv);
1156                         ASSIGN_READ_MMIO_VFUNCS(chv);
1157
1158                 } else {
1159                         ASSIGN_WRITE_MMIO_VFUNCS(gen8);
1160                         ASSIGN_READ_MMIO_VFUNCS(gen6);
1161                 }
1162                 break;
1163         case 7:
1164         case 6:
1165                 if (IS_HASWELL(dev)) {
1166                         ASSIGN_WRITE_MMIO_VFUNCS(hsw);
1167                 } else {
1168                         ASSIGN_WRITE_MMIO_VFUNCS(gen6);
1169                 }
1170
1171                 if (IS_VALLEYVIEW(dev)) {
1172                         ASSIGN_READ_MMIO_VFUNCS(vlv);
1173                 } else {
1174                         ASSIGN_READ_MMIO_VFUNCS(gen6);
1175                 }
1176                 break;
1177         case 5:
1178                 ASSIGN_WRITE_MMIO_VFUNCS(gen5);
1179                 ASSIGN_READ_MMIO_VFUNCS(gen5);
1180                 break;
1181         case 4:
1182         case 3:
1183         case 2:
1184                 ASSIGN_WRITE_MMIO_VFUNCS(gen2);
1185                 ASSIGN_READ_MMIO_VFUNCS(gen2);
1186                 break;
1187         }
1188
1189         if (intel_vgpu_active(dev)) {
1190                 ASSIGN_WRITE_MMIO_VFUNCS(vgpu);
1191                 ASSIGN_READ_MMIO_VFUNCS(vgpu);
1192         }
1193
1194         i915_check_and_clear_faults(dev);
1195 }
1196 #undef ASSIGN_WRITE_MMIO_VFUNCS
1197 #undef ASSIGN_READ_MMIO_VFUNCS
1198
1199 void intel_uncore_fini(struct drm_device *dev)
1200 {
1201         /* Paranoia: make sure we have disabled everything before we exit. */
1202         intel_uncore_sanitize(dev);
1203         intel_uncore_forcewake_reset(dev, false);
1204 }
1205
1206 #define GEN_RANGE(l, h) GENMASK(h, l)
1207
1208 static const struct register_whitelist {
1209         uint64_t offset;
1210         uint32_t size;
1211         /* supported gens, 0x10 for 4, 0x30 for 4 and 5, etc. */
1212         uint32_t gen_bitmask;
1213 } whitelist[] = {
1214         { RING_TIMESTAMP(RENDER_RING_BASE), 8, GEN_RANGE(4, 9) },
1215 };
1216
1217 int i915_reg_read_ioctl(struct drm_device *dev,
1218                         void *data, struct drm_file *file)
1219 {
1220         struct drm_i915_private *dev_priv = dev->dev_private;
1221         struct drm_i915_reg_read *reg = data;
1222         struct register_whitelist const *entry = whitelist;
1223         int i, ret = 0;
1224
1225         for (i = 0; i < ARRAY_SIZE(whitelist); i++, entry++) {
1226                 if (entry->offset == reg->offset &&
1227                     (1 << INTEL_INFO(dev)->gen & entry->gen_bitmask))
1228                         break;
1229         }
1230
1231         if (i == ARRAY_SIZE(whitelist))
1232                 return -EINVAL;
1233
1234         intel_runtime_pm_get(dev_priv);
1235
1236         switch (entry->size) {
1237         case 8:
1238                 reg->val = I915_READ64(reg->offset);
1239                 break;
1240         case 4:
1241                 reg->val = I915_READ(reg->offset);
1242                 break;
1243         case 2:
1244                 reg->val = I915_READ16(reg->offset);
1245                 break;
1246         case 1:
1247                 reg->val = I915_READ8(reg->offset);
1248                 break;
1249         default:
1250                 MISSING_CASE(entry->size);
1251                 ret = -EINVAL;
1252                 goto out;
1253         }
1254
1255 out:
1256         intel_runtime_pm_put(dev_priv);
1257         return ret;
1258 }
1259
1260 int i915_get_reset_stats_ioctl(struct drm_device *dev,
1261                                void *data, struct drm_file *file)
1262 {
1263         struct drm_i915_private *dev_priv = dev->dev_private;
1264         struct drm_i915_reset_stats *args = data;
1265         struct i915_ctx_hang_stats *hs;
1266         struct intel_context *ctx;
1267         int ret;
1268
1269         if (args->flags || args->pad)
1270                 return -EINVAL;
1271
1272         if (args->ctx_id == DEFAULT_CONTEXT_HANDLE && !capable(CAP_SYS_ADMIN))
1273                 return -EPERM;
1274
1275         ret = mutex_lock_interruptible(&dev->struct_mutex);
1276         if (ret)
1277                 return ret;
1278
1279         ctx = i915_gem_context_get(file->driver_priv, args->ctx_id);
1280         if (IS_ERR(ctx)) {
1281                 mutex_unlock(&dev->struct_mutex);
1282                 return PTR_ERR(ctx);
1283         }
1284         hs = &ctx->hang_stats;
1285
1286         if (capable(CAP_SYS_ADMIN))
1287                 args->reset_count = i915_reset_count(&dev_priv->gpu_error);
1288         else
1289                 args->reset_count = 0;
1290
1291         args->batch_active = hs->batch_active;
1292         args->batch_pending = hs->batch_pending;
1293
1294         mutex_unlock(&dev->struct_mutex);
1295
1296         return 0;
1297 }
1298
1299 static int i915_reset_complete(struct drm_device *dev)
1300 {
1301         u8 gdrst;
1302         pci_read_config_byte(dev->pdev, I915_GDRST, &gdrst);
1303         return (gdrst & GRDOM_RESET_STATUS) == 0;
1304 }
1305
1306 static int i915_do_reset(struct drm_device *dev)
1307 {
1308         /* assert reset for at least 20 usec */
1309         pci_write_config_byte(dev->pdev, I915_GDRST, GRDOM_RESET_ENABLE);
1310         udelay(20);
1311         pci_write_config_byte(dev->pdev, I915_GDRST, 0);
1312
1313         return wait_for(i915_reset_complete(dev), 500);
1314 }
1315
1316 static int g4x_reset_complete(struct drm_device *dev)
1317 {
1318         u8 gdrst;
1319         pci_read_config_byte(dev->pdev, I915_GDRST, &gdrst);
1320         return (gdrst & GRDOM_RESET_ENABLE) == 0;
1321 }
1322
1323 static int g33_do_reset(struct drm_device *dev)
1324 {
1325         pci_write_config_byte(dev->pdev, I915_GDRST, GRDOM_RESET_ENABLE);
1326         return wait_for(g4x_reset_complete(dev), 500);
1327 }
1328
1329 static int g4x_do_reset(struct drm_device *dev)
1330 {
1331         struct drm_i915_private *dev_priv = dev->dev_private;
1332         int ret;
1333
1334         pci_write_config_byte(dev->pdev, I915_GDRST,
1335                               GRDOM_RENDER | GRDOM_RESET_ENABLE);
1336         ret =  wait_for(g4x_reset_complete(dev), 500);
1337         if (ret)
1338                 return ret;
1339
1340         /* WaVcpClkGateDisableForMediaReset:ctg,elk */
1341         I915_WRITE(VDECCLK_GATE_D, I915_READ(VDECCLK_GATE_D) | VCP_UNIT_CLOCK_GATE_DISABLE);
1342         POSTING_READ(VDECCLK_GATE_D);
1343
1344         pci_write_config_byte(dev->pdev, I915_GDRST,
1345                               GRDOM_MEDIA | GRDOM_RESET_ENABLE);
1346         ret =  wait_for(g4x_reset_complete(dev), 500);
1347         if (ret)
1348                 return ret;
1349
1350         /* WaVcpClkGateDisableForMediaReset:ctg,elk */
1351         I915_WRITE(VDECCLK_GATE_D, I915_READ(VDECCLK_GATE_D) & ~VCP_UNIT_CLOCK_GATE_DISABLE);
1352         POSTING_READ(VDECCLK_GATE_D);
1353
1354         pci_write_config_byte(dev->pdev, I915_GDRST, 0);
1355
1356         return 0;
1357 }
1358
1359 static int ironlake_do_reset(struct drm_device *dev)
1360 {
1361         struct drm_i915_private *dev_priv = dev->dev_private;
1362         int ret;
1363
1364         I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
1365                    ILK_GRDOM_RENDER | ILK_GRDOM_RESET_ENABLE);
1366         ret = wait_for((I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) &
1367                         ILK_GRDOM_RESET_ENABLE) == 0, 500);
1368         if (ret)
1369                 return ret;
1370
1371         I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
1372                    ILK_GRDOM_MEDIA | ILK_GRDOM_RESET_ENABLE);
1373         ret = wait_for((I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) &
1374                         ILK_GRDOM_RESET_ENABLE) == 0, 500);
1375         if (ret)
1376                 return ret;
1377
1378         I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR, 0);
1379
1380         return 0;
1381 }
1382
1383 static int gen6_do_reset(struct drm_device *dev)
1384 {
1385         struct drm_i915_private *dev_priv = dev->dev_private;
1386         int     ret;
1387
1388         /* Reset the chip */
1389
1390         /* GEN6_GDRST is not in the gt power well, no need to check
1391          * for fifo space for the write or forcewake the chip for
1392          * the read
1393          */
1394         __raw_i915_write32(dev_priv, GEN6_GDRST, GEN6_GRDOM_FULL);
1395
1396         /* Spin waiting for the device to ack the reset request */
1397         ret = wait_for((__raw_i915_read32(dev_priv, GEN6_GDRST) & GEN6_GRDOM_FULL) == 0, 500);
1398
1399         intel_uncore_forcewake_reset(dev, true);
1400
1401         return ret;
1402 }
1403
1404 int intel_gpu_reset(struct drm_device *dev)
1405 {
1406         if (INTEL_INFO(dev)->gen >= 6)
1407                 return gen6_do_reset(dev);
1408         else if (IS_GEN5(dev))
1409                 return ironlake_do_reset(dev);
1410         else if (IS_G4X(dev))
1411                 return g4x_do_reset(dev);
1412         else if (IS_G33(dev))
1413                 return g33_do_reset(dev);
1414         else if (INTEL_INFO(dev)->gen >= 3)
1415                 return i915_do_reset(dev);
1416         else
1417                 return -ENODEV;
1418 }
1419
1420 void intel_uncore_check_errors(struct drm_device *dev)
1421 {
1422         struct drm_i915_private *dev_priv = dev->dev_private;
1423
1424         if (HAS_FPGA_DBG_UNCLAIMED(dev) &&
1425             (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {
1426                 DRM_ERROR("Unclaimed register before interrupt\n");
1427                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
1428         }
1429 }