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
  27 #define FORCEWAKE_ACK_TIMEOUT_MS 2
  28
  29 #define __raw_i915_read8(dev_priv__, reg__) readb((dev_priv__)->regs + (reg__))
  30 #define __raw_i915_write8(dev_priv__, reg__, val__) writeb(val__, (dev_priv__)->regs + (reg__))
  31
  32 #define __raw_i915_read16(dev_priv__, reg__) readw((dev_priv__)->regs + (reg__))
  33 #define __raw_i915_write16(dev_priv__, reg__, val__) writew(val__, (dev_priv__)->regs + (reg__))
  34
  35 #define __raw_i915_read32(dev_priv__, reg__) readl((dev_priv__)->regs + (reg__))
  36 #define __raw_i915_write32(dev_priv__, reg__, val__) writel(val__, (dev_priv__)->regs + (reg__))
  37
  38 #define __raw_i915_read64(dev_priv__, reg__) readq((dev_priv__)->regs + (reg__))
  39 #define __raw_i915_write64(dev_priv__, reg__, val__) writeq(val__, (dev_priv__)->regs + (reg__))
  40
  41 #define __raw_posting_read(dev_priv__, reg__) (void)__raw_i915_read32(dev_priv__, reg__)
  42
  43
  44 static void __gen6_gt_wait_for_thread_c0(struct drm_i915_private *dev_priv)
  45 {
  46         u32 gt_thread_status_mask;
  47
  48         if (IS_HASWELL(dev_priv->dev))
  49                 gt_thread_status_mask = GEN6_GT_THREAD_STATUS_CORE_MASK_HSW;
  50         else
  51                 gt_thread_status_mask = GEN6_GT_THREAD_STATUS_CORE_MASK;
  52
  53         /* w/a for a sporadic read returning 0 by waiting for the GT
  54          * thread to wake up.
  55          */
  56         if (wait_for_atomic_us((__raw_i915_read32(dev_priv, GEN6_GT_THREAD_STATUS_REG) & gt_thread_status_mask) == 0, 500))
  57                 DRM_ERROR("GT thread status wait timed out\n");
  58 }
  59
  60 static void __gen6_gt_force_wake_reset(struct drm_i915_private *dev_priv)
  61 {
  62         __raw_i915_write32(dev_priv, FORCEWAKE, 0);
  63         /* something from same cacheline, but !FORCEWAKE */
  64         __raw_posting_read(dev_priv, ECOBUS);
  65 }
  66
  67 static void __gen6_gt_force_wake_get(struct drm_i915_private *dev_priv)
  68 {
  69         if (wait_for_atomic((__raw_i915_read32(dev_priv, FORCEWAKE_ACK) & 1) == 0,
  70                             FORCEWAKE_ACK_TIMEOUT_MS))
  71                 DRM_ERROR("Timed out waiting for forcewake old ack to clear.\n");
  72
  73         __raw_i915_write32(dev_priv, FORCEWAKE, 1);
  74         /* something from same cacheline, but !FORCEWAKE */
  75         __raw_posting_read(dev_priv, ECOBUS);
  76
  77         if (wait_for_atomic((__raw_i915_read32(dev_priv, FORCEWAKE_ACK) & 1),
  78                             FORCEWAKE_ACK_TIMEOUT_MS))
  79                 DRM_ERROR("Timed out waiting for forcewake to ack request.\n");
  80
  81         /* WaRsForcewakeWaitTC0:snb */
  82         __gen6_gt_wait_for_thread_c0(dev_priv);
  83 }
  84
  85 static void __gen6_gt_force_wake_mt_reset(struct drm_i915_private *dev_priv)
  86 {
  87         __raw_i915_write32(dev_priv, FORCEWAKE_MT, _MASKED_BIT_DISABLE(0xffff));
  88         /* something from same cacheline, but !FORCEWAKE_MT */
  89         __raw_posting_read(dev_priv, ECOBUS);
  90 }
  91
  92 static void __gen6_gt_force_wake_mt_get(struct drm_i915_private *dev_priv)
  93 {
  94         u32 forcewake_ack;
  95
  96         if (IS_HASWELL(dev_priv->dev))
  97                 forcewake_ack = FORCEWAKE_ACK_HSW;
  98         else
  99                 forcewake_ack = FORCEWAKE_MT_ACK;
 100
 101         if (wait_for_atomic((__raw_i915_read32(dev_priv, forcewake_ack) & FORCEWAKE_KERNEL) == 0,
 102                             FORCEWAKE_ACK_TIMEOUT_MS))
 103                 DRM_ERROR("Timed out waiting for forcewake old ack to clear.\n");
 104
 105         __raw_i915_write32(dev_priv, FORCEWAKE_MT,
 106                            _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));
 107         /* something from same cacheline, but !FORCEWAKE_MT */
 108         __raw_posting_read(dev_priv, ECOBUS);
 109
 110         if (wait_for_atomic((__raw_i915_read32(dev_priv, forcewake_ack) & FORCEWAKE_KERNEL),
 111                             FORCEWAKE_ACK_TIMEOUT_MS))
 112                 DRM_ERROR("Timed out waiting for forcewake to ack request.\n");
 113
 114         /* WaRsForcewakeWaitTC0:ivb,hsw */
 115         __gen6_gt_wait_for_thread_c0(dev_priv);
 116 }
 117
 118 static void gen6_gt_check_fifodbg(struct drm_i915_private *dev_priv)
 119 {
 120         u32 gtfifodbg;
 121
 122         gtfifodbg = __raw_i915_read32(dev_priv, GTFIFODBG);
 123         if (WARN(gtfifodbg & GT_FIFO_CPU_ERROR_MASK,
 124              "MMIO read or write has been dropped %x\n", gtfifodbg))
 125                 __raw_i915_write32(dev_priv, GTFIFODBG, GT_FIFO_CPU_ERROR_MASK);
 126 }
 127
 128 static void __gen6_gt_force_wake_put(struct drm_i915_private *dev_priv)
 129 {
 130         __raw_i915_write32(dev_priv, FORCEWAKE, 0);
 131         /* something from same cacheline, but !FORCEWAKE */
 132         __raw_posting_read(dev_priv, ECOBUS);
 133         gen6_gt_check_fifodbg(dev_priv);
 134 }
 135
 136 static void __gen6_gt_force_wake_mt_put(struct drm_i915_private *dev_priv)
 137 {
 138         __raw_i915_write32(dev_priv, FORCEWAKE_MT,
 139                            _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL));
 140         /* something from same cacheline, but !FORCEWAKE_MT */
 141         __raw_posting_read(dev_priv, ECOBUS);
 142         gen6_gt_check_fifodbg(dev_priv);
 143 }
 144
 145 static int __gen6_gt_wait_for_fifo(struct drm_i915_private *dev_priv)
 146 {
 147         int ret = 0;
 148
 149         if (dev_priv->uncore.fifo_count < GT_FIFO_NUM_RESERVED_ENTRIES) {
 150                 int loop = 500;
 151                 u32 fifo = __raw_i915_read32(dev_priv, GT_FIFO_FREE_ENTRIES);
 152                 while (fifo <= GT_FIFO_NUM_RESERVED_ENTRIES && loop--) {
 153                         udelay(10);
 154                         fifo = __raw_i915_read32(dev_priv, GT_FIFO_FREE_ENTRIES);
 155                 }
 156                 if (WARN_ON(loop < 0 && fifo <= GT_FIFO_NUM_RESERVED_ENTRIES))
 157                         ++ret;
 158                 dev_priv->uncore.fifo_count = fifo;
 159         }
 160         dev_priv->uncore.fifo_count--;
 161
 162         return ret;
 163 }
 164
 165 static void vlv_force_wake_reset(struct drm_i915_private *dev_priv)
 166 {
 167         __raw_i915_write32(dev_priv, FORCEWAKE_VLV,
 168                            _MASKED_BIT_DISABLE(0xffff));
 169         /* something from same cacheline, but !FORCEWAKE_VLV */
 170         __raw_posting_read(dev_priv, FORCEWAKE_ACK_VLV);
 171 }
 172
 173 static void vlv_force_wake_get(struct drm_i915_private *dev_priv)
 174 {
 175         if (wait_for_atomic((__raw_i915_read32(dev_priv, FORCEWAKE_ACK_VLV) & FORCEWAKE_KERNEL) == 0,
 176                             FORCEWAKE_ACK_TIMEOUT_MS))
 177                 DRM_ERROR("Timed out waiting for forcewake old ack to clear.\n");
 178
 179         __raw_i915_write32(dev_priv, FORCEWAKE_VLV,
 180                            _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));
 181         __raw_i915_write32(dev_priv, FORCEWAKE_MEDIA_VLV,
 182                            _MASKED_BIT_ENABLE(FORCEWAKE_KERNEL));
 183
 184         if (wait_for_atomic((__raw_i915_read32(dev_priv, FORCEWAKE_ACK_VLV) & FORCEWAKE_KERNEL),
 185                             FORCEWAKE_ACK_TIMEOUT_MS))
 186                 DRM_ERROR("Timed out waiting for GT to ack forcewake request.\n");
 187
 188         if (wait_for_atomic((__raw_i915_read32(dev_priv, FORCEWAKE_ACK_MEDIA_VLV) &
 189                              FORCEWAKE_KERNEL),
 190                             FORCEWAKE_ACK_TIMEOUT_MS))
 191                 DRM_ERROR("Timed out waiting for media to ack forcewake request.\n");
 192
 193         /* WaRsForcewakeWaitTC0:vlv */
 194         __gen6_gt_wait_for_thread_c0(dev_priv);
 195 }
 196
 197 static void vlv_force_wake_put(struct drm_i915_private *dev_priv)
 198 {
 199         __raw_i915_write32(dev_priv, FORCEWAKE_VLV,
 200                            _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL));
 201         __raw_i915_write32(dev_priv, FORCEWAKE_MEDIA_VLV,
 202                            _MASKED_BIT_DISABLE(FORCEWAKE_KERNEL));
 203         /* The below doubles as a POSTING_READ */
 204         gen6_gt_check_fifodbg(dev_priv);
 205 }
 206
 207 static void gen6_force_wake_work(struct work_struct *work)
 208 {
 209         struct drm_i915_private *dev_priv =
 210                 container_of(work, typeof(*dev_priv), uncore.force_wake_work.work);
 211         unsigned long irqflags;
 212
 213         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 214         if (--dev_priv->uncore.forcewake_count == 0)
 215                 dev_priv->uncore.funcs.force_wake_put(dev_priv);
 216         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 217 }
 218
 219 void intel_uncore_early_sanitize(struct drm_device *dev)
 220 {
 221         struct drm_i915_private *dev_priv = dev->dev_private;
 222
 223         if (HAS_FPGA_DBG_UNCLAIMED(dev))
 224                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 225 }
 226
 227 void intel_uncore_init(struct drm_device *dev)
 228 {
 229         struct drm_i915_private *dev_priv = dev->dev_private;
 230
 231         INIT_DELAYED_WORK(&dev_priv->uncore.force_wake_work,
 232                           gen6_force_wake_work);
 233
 234         if (IS_VALLEYVIEW(dev)) {
 235                 dev_priv->uncore.funcs.force_wake_get = vlv_force_wake_get;
 236                 dev_priv->uncore.funcs.force_wake_put = vlv_force_wake_put;
 237         } else if (IS_HASWELL(dev)) {
 238                 dev_priv->uncore.funcs.force_wake_get = __gen6_gt_force_wake_mt_get;
 239                 dev_priv->uncore.funcs.force_wake_put = __gen6_gt_force_wake_mt_put;
 240         } else if (IS_IVYBRIDGE(dev)) {
 241                 u32 ecobus;
 242
 243                 /* IVB configs may use multi-threaded forcewake */
 244
 245                 /* A small trick here - if the bios hasn't configured
 246                  * MT forcewake, and if the device is in RC6, then
 247                  * force_wake_mt_get will not wake the device and the
 248                  * ECOBUS read will return zero. Which will be
 249                  * (correctly) interpreted by the test below as MT
 250                  * forcewake being disabled.
 251                  */
 252                 mutex_lock(&dev->struct_mutex);
 253                 __gen6_gt_force_wake_mt_get(dev_priv);
 254                 ecobus = __raw_i915_read32(dev_priv, ECOBUS);
 255                 __gen6_gt_force_wake_mt_put(dev_priv);
 256                 mutex_unlock(&dev->struct_mutex);
 257
 258                 if (ecobus & FORCEWAKE_MT_ENABLE) {
 259                         dev_priv->uncore.funcs.force_wake_get =
 260                                 __gen6_gt_force_wake_mt_get;
 261                         dev_priv->uncore.funcs.force_wake_put =
 262                                 __gen6_gt_force_wake_mt_put;
 263                 } else {
 264                         DRM_INFO("No MT forcewake available on Ivybridge, this can result in issues\n");
 265                         DRM_INFO("when using vblank-synced partial screen updates.\n");
 266                         dev_priv->uncore.funcs.force_wake_get =
 267                                 __gen6_gt_force_wake_get;
 268                         dev_priv->uncore.funcs.force_wake_put =
 269                                 __gen6_gt_force_wake_put;
 270                 }
 271         } else if (IS_GEN6(dev)) {
 272                 dev_priv->uncore.funcs.force_wake_get =
 273                         __gen6_gt_force_wake_get;
 274                 dev_priv->uncore.funcs.force_wake_put =
 275                         __gen6_gt_force_wake_put;
 276         }
 277 }
 278
 279 void intel_uncore_fini(struct drm_device *dev)
 280 {
 281         struct drm_i915_private *dev_priv = dev->dev_private;
 282
 283         flush_delayed_work(&dev_priv->uncore.force_wake_work);
 284
 285         /* Paranoia: make sure we have disabled everything before we exit. */
 286         intel_uncore_sanitize(dev);
 287 }
 288
 289 static void intel_uncore_forcewake_reset(struct drm_device *dev)
 290 {
 291         struct drm_i915_private *dev_priv = dev->dev_private;
 292
 293         if (IS_VALLEYVIEW(dev)) {
 294                 vlv_force_wake_reset(dev_priv);
 295         } else if (INTEL_INFO(dev)->gen >= 6) {
 296                 __gen6_gt_force_wake_reset(dev_priv);
 297                 if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
 298                         __gen6_gt_force_wake_mt_reset(dev_priv);
 299         }
 300 }
 301
 302 void intel_uncore_sanitize(struct drm_device *dev)
 303 {
 304         intel_uncore_forcewake_reset(dev);
 305
 306         /* BIOS often leaves RC6 enabled, but disable it for hw init */
 307         intel_disable_gt_powersave(dev);
 308 }
 309
 310 /*
 311  * Generally this is called implicitly by the register read function. However,
 312  * if some sequence requires the GT to not power down then this function should
 313  * be called at the beginning of the sequence followed by a call to
 314  * gen6_gt_force_wake_put() at the end of the sequence.
 315  */
 316 void gen6_gt_force_wake_get(struct drm_i915_private *dev_priv)
 317 {
 318         unsigned long irqflags;
 319
 320         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 321         if (dev_priv->uncore.forcewake_count++ == 0)
 322                 dev_priv->uncore.funcs.force_wake_get(dev_priv);
 323         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 324 }
 325
 326 /*
 327  * see gen6_gt_force_wake_get()
 328  */
 329 void gen6_gt_force_wake_put(struct drm_i915_private *dev_priv)
 330 {
 331         unsigned long irqflags;
 332
 333         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 334         if (--dev_priv->uncore.forcewake_count == 0) {
 335                 dev_priv->uncore.forcewake_count++;
 336                 mod_delayed_work(dev_priv->wq,
 337                                  &dev_priv->uncore.force_wake_work,
 338                                  1);
 339         }
 340         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 341 }
 342
 343 /* We give fast paths for the really cool registers */
 344 #define NEEDS_FORCE_WAKE(dev_priv, reg) \
 345         ((HAS_FORCE_WAKE((dev_priv)->dev)) && \
 346          ((reg) < 0x40000) &&            \
 347          ((reg) != FORCEWAKE))
 348
 349 static void
 350 ilk_dummy_write(struct drm_i915_private *dev_priv)
 351 {
 352         /* WaIssueDummyWriteToWakeupFromRC6:ilk Issue a dummy write to wake up
 353          * the chip from rc6 before touching it for real. MI_MODE is masked,
 354          * hence harmless to write 0 into. */
 355         __raw_i915_write32(dev_priv, MI_MODE, 0);
 356 }
 357
 358 static void
 359 hsw_unclaimed_reg_clear(struct drm_i915_private *dev_priv, u32 reg)
 360 {
 361         if (HAS_FPGA_DBG_UNCLAIMED(dev_priv->dev) &&
 362             (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {
 363                 DRM_ERROR("Unknown unclaimed register before writing to %x\n",
 364                           reg);
 365                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 366         }
 367 }
 368
 369 static void
 370 hsw_unclaimed_reg_check(struct drm_i915_private *dev_priv, u32 reg)
 371 {
 372         if (HAS_FPGA_DBG_UNCLAIMED(dev_priv->dev) &&
 373             (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {
 374                 DRM_ERROR("Unclaimed write to %x\n", reg);
 375                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 376         }
 377 }
 378
 379 #define __i915_read(x) \
 380 u##x i915_read##x(struct drm_i915_private *dev_priv, u32 reg, bool trace) { \
 381         unsigned long irqflags; \
 382         u##x val = 0; \
 383         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); \
 384         if (dev_priv->info->gen == 5) \
 385                 ilk_dummy_write(dev_priv); \
 386         if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
 387                 if (dev_priv->uncore.forcewake_count == 0) \
 388                         dev_priv->uncore.funcs.force_wake_get(dev_priv); \
 389                 val = __raw_i915_read##x(dev_priv, reg); \
 390                 if (dev_priv->uncore.forcewake_count == 0) \
 391                         dev_priv->uncore.funcs.force_wake_put(dev_priv); \
 392         } else { \
 393                 val = __raw_i915_read##x(dev_priv, reg); \
 394         } \
 395         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
 396         trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \
 397         return val; \
 398 }
 399
 400 __i915_read(8)
 401 __i915_read(16)
 402 __i915_read(32)
 403 __i915_read(64)
 404 #undef __i915_read
 405
 406 #define __i915_write(x) \
 407 void i915_write##x(struct drm_i915_private *dev_priv, u32 reg, u##x val, bool trace) { \
 408         unsigned long irqflags; \
 409         u32 __fifo_ret = 0; \
 410         trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \
 411         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); \
 412         if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
 413                 __fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
 414         } \
 415         if (dev_priv->info->gen == 5) \
 416                 ilk_dummy_write(dev_priv); \
 417         hsw_unclaimed_reg_clear(dev_priv, reg); \
 418         __raw_i915_write##x(dev_priv, reg, val); \
 419         if (unlikely(__fifo_ret)) { \
 420                 gen6_gt_check_fifodbg(dev_priv); \
 421         } \
 422         hsw_unclaimed_reg_check(dev_priv, reg); \
 423         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
 424 }
 425 __i915_write(8)
 426 __i915_write(16)
 427 __i915_write(32)
 428 __i915_write(64)
 429 #undef __i915_write
 430
 431 static const struct register_whitelist {
 432         uint64_t offset;
 433         uint32_t size;
 434         uint32_t gen_bitmask; /* support gens, 0x10 for 4, 0x30 for 4 and 5, etc. */
 435 } whitelist[] = {
 436         { RING_TIMESTAMP(RENDER_RING_BASE), 8, 0xF0 },
 437 };
 438
 439 int i915_reg_read_ioctl(struct drm_device *dev,
 440                         void *data, struct drm_file *file)
 441 {
 442         struct drm_i915_private *dev_priv = dev->dev_private;
 443         struct drm_i915_reg_read *reg = data;
 444         struct register_whitelist const *entry = whitelist;
 445         int i;
 446
 447         for (i = 0; i < ARRAY_SIZE(whitelist); i++, entry++) {
 448                 if (entry->offset == reg->offset &&
 449                     (1 << INTEL_INFO(dev)->gen & entry->gen_bitmask))
 450                         break;
 451         }
 452
 453         if (i == ARRAY_SIZE(whitelist))
 454                 return -EINVAL;
 455
 456         switch (entry->size) {
 457         case 8:
 458                 reg->val = I915_READ64(reg->offset);
 459                 break;
 460         case 4:
 461                 reg->val = I915_READ(reg->offset);
 462                 break;
 463         case 2:
 464                 reg->val = I915_READ16(reg->offset);
 465                 break;
 466         case 1:
 467                 reg->val = I915_READ8(reg->offset);
 468                 break;
 469         default:
 470                 WARN_ON(1);
 471                 return -EINVAL;
 472         }
 473
 474         return 0;
 475 }
 476
 477 static int i8xx_do_reset(struct drm_device *dev)
 478 {
 479         struct drm_i915_private *dev_priv = dev->dev_private;
 480
 481         if (IS_I85X(dev))
 482                 return -ENODEV;
 483
 484         I915_WRITE(D_STATE, I915_READ(D_STATE) | DSTATE_GFX_RESET_I830);
 485         POSTING_READ(D_STATE);
 486
 487         if (IS_I830(dev) || IS_845G(dev)) {
 488                 I915_WRITE(DEBUG_RESET_I830,
 489                            DEBUG_RESET_DISPLAY |
 490                            DEBUG_RESET_RENDER |
 491                            DEBUG_RESET_FULL);
 492                 POSTING_READ(DEBUG_RESET_I830);
 493                 msleep(1);
 494
 495                 I915_WRITE(DEBUG_RESET_I830, 0);
 496                 POSTING_READ(DEBUG_RESET_I830);
 497         }
 498
 499         msleep(1);
 500
 501         I915_WRITE(D_STATE, I915_READ(D_STATE) & ~DSTATE_GFX_RESET_I830);
 502         POSTING_READ(D_STATE);
 503
 504         return 0;
 505 }
 506
 507 static int i965_reset_complete(struct drm_device *dev)
 508 {
 509         u8 gdrst;
 510         pci_read_config_byte(dev->pdev, I965_GDRST, &gdrst);
 511         return (gdrst & GRDOM_RESET_ENABLE) == 0;
 512 }
 513
 514 static int i965_do_reset(struct drm_device *dev)
 515 {
 516         int ret;
 517
 518         /*
 519          * Set the domains we want to reset (GRDOM/bits 2 and 3) as
 520          * well as the reset bit (GR/bit 0).  Setting the GR bit
 521          * triggers the reset; when done, the hardware will clear it.
 522          */
 523         pci_write_config_byte(dev->pdev, I965_GDRST,
 524                               GRDOM_RENDER | GRDOM_RESET_ENABLE);
 525         ret =  wait_for(i965_reset_complete(dev), 500);
 526         if (ret)
 527                 return ret;
 528
 529         /* We can't reset render&media without also resetting display ... */
 530         pci_write_config_byte(dev->pdev, I965_GDRST,
 531                               GRDOM_MEDIA | GRDOM_RESET_ENABLE);
 532
 533         ret =  wait_for(i965_reset_complete(dev), 500);
 534         if (ret)
 535                 return ret;
 536
 537         pci_write_config_byte(dev->pdev, I965_GDRST, 0);
 538
 539         return 0;
 540 }
 541
 542 static int ironlake_do_reset(struct drm_device *dev)
 543 {
 544         struct drm_i915_private *dev_priv = dev->dev_private;
 545         u32 gdrst;
 546         int ret;
 547
 548         gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
 549         gdrst &= ~GRDOM_MASK;
 550         I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
 551                    gdrst | GRDOM_RENDER | GRDOM_RESET_ENABLE);
 552         ret = wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);
 553         if (ret)
 554                 return ret;
 555
 556         /* We can't reset render&media without also resetting display ... */
 557         gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
 558         gdrst &= ~GRDOM_MASK;
 559         I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
 560                    gdrst | GRDOM_MEDIA | GRDOM_RESET_ENABLE);
 561         return wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);
 562 }
 563
 564 static int gen6_do_reset(struct drm_device *dev)
 565 {
 566         struct drm_i915_private *dev_priv = dev->dev_private;
 567         int     ret;
 568         unsigned long irqflags;
 569
 570         /* Hold uncore.lock across reset to prevent any register access
 571          * with forcewake not set correctly
 572          */
 573         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 574
 575         /* Reset the chip */
 576
 577         /* GEN6_GDRST is not in the gt power well, no need to check
 578          * for fifo space for the write or forcewake the chip for
 579          * the read
 580          */
 581         __raw_i915_write32(dev_priv, GEN6_GDRST, GEN6_GRDOM_FULL);
 582
 583         /* Spin waiting for the device to ack the reset request */
 584         ret = wait_for((__raw_i915_read32(dev_priv, GEN6_GDRST) & GEN6_GRDOM_FULL) == 0, 500);
 585
 586         intel_uncore_forcewake_reset(dev);
 587
 588         /* If reset with a user forcewake, try to restore, otherwise turn it off */
 589         if (dev_priv->uncore.forcewake_count)
 590                 dev_priv->uncore.funcs.force_wake_get(dev_priv);
 591         else
 592                 dev_priv->uncore.funcs.force_wake_put(dev_priv);
 593
 594         /* Restore fifo count */
 595         dev_priv->uncore.fifo_count = __raw_i915_read32(dev_priv, GT_FIFO_FREE_ENTRIES);
 596
 597         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 598         return ret;
 599 }
 600
 601 int intel_gpu_reset(struct drm_device *dev)
 602 {
 603         switch (INTEL_INFO(dev)->gen) {
 604         case 7:
 605         case 6: return gen6_do_reset(dev);
 606         case 5: return ironlake_do_reset(dev);
 607         case 4: return i965_do_reset(dev);
 608         case 2: return i8xx_do_reset(dev);
 609         default: return -ENODEV;
 610         }
 611 }
 612
 613 void intel_uncore_clear_errors(struct drm_device *dev)
 614 {
 615         struct drm_i915_private *dev_priv = dev->dev_private;
 616
 617         /* XXX needs spinlock around caller's grouping */
 618         if (HAS_FPGA_DBG_UNCLAIMED(dev))
 619                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 620 }
 621
 622 void intel_uncore_check_errors(struct drm_device *dev)
 623 {
 624         struct drm_i915_private *dev_priv = dev->dev_private;
 625
 626         if (HAS_FPGA_DBG_UNCLAIMED(dev) &&
 627             (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {
 628                 DRM_ERROR("Unclaimed register before interrupt\n");
 629                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 630         }
 631 }