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 void intel_uncore_early_sanitize(struct drm_device *dev)
 208 {
 209         struct drm_i915_private *dev_priv = dev->dev_private;
 210
 211         if (HAS_FPGA_DBG_UNCLAIMED(dev))
 212                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 213 }
 214
 215 void intel_uncore_init(struct drm_device *dev)
 216 {
 217         struct drm_i915_private *dev_priv = dev->dev_private;
 218
 219         if (IS_VALLEYVIEW(dev)) {
 220                 dev_priv->uncore.funcs.force_wake_get = vlv_force_wake_get;
 221                 dev_priv->uncore.funcs.force_wake_put = vlv_force_wake_put;
 222         } else if (IS_HASWELL(dev)) {
 223                 dev_priv->uncore.funcs.force_wake_get = __gen6_gt_force_wake_mt_get;
 224                 dev_priv->uncore.funcs.force_wake_put = __gen6_gt_force_wake_mt_put;
 225         } else if (IS_IVYBRIDGE(dev)) {
 226                 u32 ecobus;
 227
 228                 /* IVB configs may use multi-threaded forcewake */
 229
 230                 /* A small trick here - if the bios hasn't configured
 231                  * MT forcewake, and if the device is in RC6, then
 232                  * force_wake_mt_get will not wake the device and the
 233                  * ECOBUS read will return zero. Which will be
 234                  * (correctly) interpreted by the test below as MT
 235                  * forcewake being disabled.
 236                  */
 237                 mutex_lock(&dev->struct_mutex);
 238                 __gen6_gt_force_wake_mt_get(dev_priv);
 239                 ecobus = __raw_i915_read32(dev_priv, ECOBUS);
 240                 __gen6_gt_force_wake_mt_put(dev_priv);
 241                 mutex_unlock(&dev->struct_mutex);
 242
 243                 if (ecobus & FORCEWAKE_MT_ENABLE) {
 244                         dev_priv->uncore.funcs.force_wake_get =
 245                                 __gen6_gt_force_wake_mt_get;
 246                         dev_priv->uncore.funcs.force_wake_put =
 247                                 __gen6_gt_force_wake_mt_put;
 248                 } else {
 249                         DRM_INFO("No MT forcewake available on Ivybridge, this can result in issues\n");
 250                         DRM_INFO("when using vblank-synced partial screen updates.\n");
 251                         dev_priv->uncore.funcs.force_wake_get =
 252                                 __gen6_gt_force_wake_get;
 253                         dev_priv->uncore.funcs.force_wake_put =
 254                                 __gen6_gt_force_wake_put;
 255                 }
 256         } else if (IS_GEN6(dev)) {
 257                 dev_priv->uncore.funcs.force_wake_get =
 258                         __gen6_gt_force_wake_get;
 259                 dev_priv->uncore.funcs.force_wake_put =
 260                         __gen6_gt_force_wake_put;
 261         }
 262 }
 263
 264 static void intel_uncore_forcewake_reset(struct drm_device *dev)
 265 {
 266         struct drm_i915_private *dev_priv = dev->dev_private;
 267
 268         if (IS_VALLEYVIEW(dev)) {
 269                 vlv_force_wake_reset(dev_priv);
 270         } else if (INTEL_INFO(dev)->gen >= 6) {
 271                 __gen6_gt_force_wake_reset(dev_priv);
 272                 if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
 273                         __gen6_gt_force_wake_mt_reset(dev_priv);
 274         }
 275 }
 276
 277 void intel_uncore_sanitize(struct drm_device *dev)
 278 {
 279         intel_uncore_forcewake_reset(dev);
 280
 281         /* BIOS often leaves RC6 enabled, but disable it for hw init */
 282         intel_disable_gt_powersave(dev);
 283 }
 284
 285 /*
 286  * Generally this is called implicitly by the register read function. However,
 287  * if some sequence requires the GT to not power down then this function should
 288  * be called at the beginning of the sequence followed by a call to
 289  * gen6_gt_force_wake_put() at the end of the sequence.
 290  */
 291 void gen6_gt_force_wake_get(struct drm_i915_private *dev_priv)
 292 {
 293         unsigned long irqflags;
 294
 295         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 296         if (dev_priv->uncore.forcewake_count++ == 0)
 297                 dev_priv->uncore.funcs.force_wake_get(dev_priv);
 298         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 299 }
 300
 301 /*
 302  * see gen6_gt_force_wake_get()
 303  */
 304 void gen6_gt_force_wake_put(struct drm_i915_private *dev_priv)
 305 {
 306         unsigned long irqflags;
 307
 308         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 309         if (--dev_priv->uncore.forcewake_count == 0)
 310                 dev_priv->uncore.funcs.force_wake_put(dev_priv);
 311         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 312 }
 313
 314 /* We give fast paths for the really cool registers */
 315 #define NEEDS_FORCE_WAKE(dev_priv, reg) \
 316         ((HAS_FORCE_WAKE((dev_priv)->dev)) && \
 317          ((reg) < 0x40000) &&            \
 318          ((reg) != FORCEWAKE))
 319
 320 static void
 321 ilk_dummy_write(struct drm_i915_private *dev_priv)
 322 {
 323         /* WaIssueDummyWriteToWakeupFromRC6:ilk Issue a dummy write to wake up
 324          * the chip from rc6 before touching it for real. MI_MODE is masked,
 325          * hence harmless to write 0 into. */
 326         __raw_i915_write32(dev_priv, MI_MODE, 0);
 327 }
 328
 329 static void
 330 hsw_unclaimed_reg_clear(struct drm_i915_private *dev_priv, u32 reg)
 331 {
 332         if (HAS_FPGA_DBG_UNCLAIMED(dev_priv->dev) &&
 333             (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {
 334                 DRM_ERROR("Unknown unclaimed register before writing to %x\n",
 335                           reg);
 336                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 337         }
 338 }
 339
 340 static void
 341 hsw_unclaimed_reg_check(struct drm_i915_private *dev_priv, u32 reg)
 342 {
 343         if (HAS_FPGA_DBG_UNCLAIMED(dev_priv->dev) &&
 344             (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {
 345                 DRM_ERROR("Unclaimed write to %x\n", reg);
 346                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 347         }
 348 }
 349
 350 #define __i915_read(x) \
 351 u##x i915_read##x(struct drm_i915_private *dev_priv, u32 reg, bool trace) { \
 352         unsigned long irqflags; \
 353         u##x val = 0; \
 354         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); \
 355         if (dev_priv->info->gen == 5) \
 356                 ilk_dummy_write(dev_priv); \
 357         if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
 358                 if (dev_priv->uncore.forcewake_count == 0) \
 359                         dev_priv->uncore.funcs.force_wake_get(dev_priv); \
 360                 val = __raw_i915_read##x(dev_priv, reg); \
 361                 if (dev_priv->uncore.forcewake_count == 0) \
 362                         dev_priv->uncore.funcs.force_wake_put(dev_priv); \
 363         } else { \
 364                 val = __raw_i915_read##x(dev_priv, reg); \
 365         } \
 366         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
 367         trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \
 368         return val; \
 369 }
 370
 371 __i915_read(8)
 372 __i915_read(16)
 373 __i915_read(32)
 374 __i915_read(64)
 375 #undef __i915_read
 376
 377 #define __i915_write(x) \
 378 void i915_write##x(struct drm_i915_private *dev_priv, u32 reg, u##x val, bool trace) { \
 379         unsigned long irqflags; \
 380         u32 __fifo_ret = 0; \
 381         trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \
 382         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags); \
 383         if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
 384                 __fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
 385         } \
 386         if (dev_priv->info->gen == 5) \
 387                 ilk_dummy_write(dev_priv); \
 388         hsw_unclaimed_reg_clear(dev_priv, reg); \
 389         __raw_i915_write##x(dev_priv, reg, val); \
 390         if (unlikely(__fifo_ret)) { \
 391                 gen6_gt_check_fifodbg(dev_priv); \
 392         } \
 393         hsw_unclaimed_reg_check(dev_priv, reg); \
 394         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
 395 }
 396 __i915_write(8)
 397 __i915_write(16)
 398 __i915_write(32)
 399 __i915_write(64)
 400 #undef __i915_write
 401
 402 static const struct register_whitelist {
 403         uint64_t offset;
 404         uint32_t size;
 405         uint32_t gen_bitmask; /* support gens, 0x10 for 4, 0x30 for 4 and 5, etc. */
 406 } whitelist[] = {
 407         { RING_TIMESTAMP(RENDER_RING_BASE), 8, 0xF0 },
 408 };
 409
 410 int i915_reg_read_ioctl(struct drm_device *dev,
 411                         void *data, struct drm_file *file)
 412 {
 413         struct drm_i915_private *dev_priv = dev->dev_private;
 414         struct drm_i915_reg_read *reg = data;
 415         struct register_whitelist const *entry = whitelist;
 416         int i;
 417
 418         for (i = 0; i < ARRAY_SIZE(whitelist); i++, entry++) {
 419                 if (entry->offset == reg->offset &&
 420                     (1 << INTEL_INFO(dev)->gen & entry->gen_bitmask))
 421                         break;
 422         }
 423
 424         if (i == ARRAY_SIZE(whitelist))
 425                 return -EINVAL;
 426
 427         switch (entry->size) {
 428         case 8:
 429                 reg->val = I915_READ64(reg->offset);
 430                 break;
 431         case 4:
 432                 reg->val = I915_READ(reg->offset);
 433                 break;
 434         case 2:
 435                 reg->val = I915_READ16(reg->offset);
 436                 break;
 437         case 1:
 438                 reg->val = I915_READ8(reg->offset);
 439                 break;
 440         default:
 441                 WARN_ON(1);
 442                 return -EINVAL;
 443         }
 444
 445         return 0;
 446 }
 447
 448 static int i8xx_do_reset(struct drm_device *dev)
 449 {
 450         struct drm_i915_private *dev_priv = dev->dev_private;
 451
 452         if (IS_I85X(dev))
 453                 return -ENODEV;
 454
 455         I915_WRITE(D_STATE, I915_READ(D_STATE) | DSTATE_GFX_RESET_I830);
 456         POSTING_READ(D_STATE);
 457
 458         if (IS_I830(dev) || IS_845G(dev)) {
 459                 I915_WRITE(DEBUG_RESET_I830,
 460                            DEBUG_RESET_DISPLAY |
 461                            DEBUG_RESET_RENDER |
 462                            DEBUG_RESET_FULL);
 463                 POSTING_READ(DEBUG_RESET_I830);
 464                 msleep(1);
 465
 466                 I915_WRITE(DEBUG_RESET_I830, 0);
 467                 POSTING_READ(DEBUG_RESET_I830);
 468         }
 469
 470         msleep(1);
 471
 472         I915_WRITE(D_STATE, I915_READ(D_STATE) & ~DSTATE_GFX_RESET_I830);
 473         POSTING_READ(D_STATE);
 474
 475         return 0;
 476 }
 477
 478 static int i965_reset_complete(struct drm_device *dev)
 479 {
 480         u8 gdrst;
 481         pci_read_config_byte(dev->pdev, I965_GDRST, &gdrst);
 482         return (gdrst & GRDOM_RESET_ENABLE) == 0;
 483 }
 484
 485 static int i965_do_reset(struct drm_device *dev)
 486 {
 487         int ret;
 488
 489         /*
 490          * Set the domains we want to reset (GRDOM/bits 2 and 3) as
 491          * well as the reset bit (GR/bit 0).  Setting the GR bit
 492          * triggers the reset; when done, the hardware will clear it.
 493          */
 494         pci_write_config_byte(dev->pdev, I965_GDRST,
 495                               GRDOM_RENDER | GRDOM_RESET_ENABLE);
 496         ret =  wait_for(i965_reset_complete(dev), 500);
 497         if (ret)
 498                 return ret;
 499
 500         /* We can't reset render&media without also resetting display ... */
 501         pci_write_config_byte(dev->pdev, I965_GDRST,
 502                               GRDOM_MEDIA | GRDOM_RESET_ENABLE);
 503
 504         ret =  wait_for(i965_reset_complete(dev), 500);
 505         if (ret)
 506                 return ret;
 507
 508         pci_write_config_byte(dev->pdev, I965_GDRST, 0);
 509
 510         return 0;
 511 }
 512
 513 static int ironlake_do_reset(struct drm_device *dev)
 514 {
 515         struct drm_i915_private *dev_priv = dev->dev_private;
 516         u32 gdrst;
 517         int ret;
 518
 519         gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
 520         gdrst &= ~GRDOM_MASK;
 521         I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
 522                    gdrst | GRDOM_RENDER | GRDOM_RESET_ENABLE);
 523         ret = wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);
 524         if (ret)
 525                 return ret;
 526
 527         /* We can't reset render&media without also resetting display ... */
 528         gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
 529         gdrst &= ~GRDOM_MASK;
 530         I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
 531                    gdrst | GRDOM_MEDIA | GRDOM_RESET_ENABLE);
 532         return wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);
 533 }
 534
 535 static int gen6_do_reset(struct drm_device *dev)
 536 {
 537         struct drm_i915_private *dev_priv = dev->dev_private;
 538         int     ret;
 539         unsigned long irqflags;
 540
 541         /* Hold uncore.lock across reset to prevent any register access
 542          * with forcewake not set correctly
 543          */
 544         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 545
 546         /* Reset the chip */
 547
 548         /* GEN6_GDRST is not in the gt power well, no need to check
 549          * for fifo space for the write or forcewake the chip for
 550          * the read
 551          */
 552         __raw_i915_write32(dev_priv, GEN6_GDRST, GEN6_GRDOM_FULL);
 553
 554         /* Spin waiting for the device to ack the reset request */
 555         ret = wait_for((__raw_i915_read32(dev_priv, GEN6_GDRST) & GEN6_GRDOM_FULL) == 0, 500);
 556
 557         intel_uncore_forcewake_reset(dev);
 558
 559         /* If reset with a user forcewake, try to restore, otherwise turn it off */
 560         if (dev_priv->uncore.forcewake_count)
 561                 dev_priv->uncore.funcs.force_wake_get(dev_priv);
 562         else
 563                 dev_priv->uncore.funcs.force_wake_put(dev_priv);
 564
 565         /* Restore fifo count */
 566         dev_priv->uncore.fifo_count = __raw_i915_read32(dev_priv, GT_FIFO_FREE_ENTRIES);
 567
 568         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 569         return ret;
 570 }
 571
 572 int intel_gpu_reset(struct drm_device *dev)
 573 {
 574         switch (INTEL_INFO(dev)->gen) {
 575         case 7:
 576         case 6: return gen6_do_reset(dev);
 577         case 5: return ironlake_do_reset(dev);
 578         case 4: return i965_do_reset(dev);
 579         case 2: return i8xx_do_reset(dev);
 580         default: return -ENODEV;
 581         }
 582 }
 583
 584 void intel_uncore_clear_errors(struct drm_device *dev)
 585 {
 586         struct drm_i915_private *dev_priv = dev->dev_private;
 587
 588         /* XXX needs spinlock around caller's grouping */
 589         if (HAS_FPGA_DBG_UNCLAIMED(dev))
 590                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 591 }
 592
 593 void intel_uncore_check_errors(struct drm_device *dev)
 594 {
 595         struct drm_i915_private *dev_priv = dev->dev_private;
 596
 597         if (HAS_FPGA_DBG_UNCLAIMED(dev) &&
 598             (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {
 599                 DRM_ERROR("Unclaimed register before interrupt\n");
 600                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 601         }
 602 }