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         if (IS_HASWELL(dev) &&
 227             (__raw_i915_read32(dev_priv, HSW_EDRAM_PRESENT) == 1)) {
 228                 /* The docs do not explain exactly how the calculation can be
 229                  * made. It is somewhat guessable, but for now, it's always
 230                  * 128MB.
 231                  * NB: We can't write IDICR yet because we do not have gt funcs
 232                  * set up */
 233                 dev_priv->ellc_size = 128;
 234                 DRM_INFO("Found %zuMB of eLLC\n", dev_priv->ellc_size);
 235         }
 236 }
 237
 238 static void intel_uncore_forcewake_reset(struct drm_device *dev)
 239 {
 240         struct drm_i915_private *dev_priv = dev->dev_private;
 241
 242         if (IS_VALLEYVIEW(dev)) {
 243                 vlv_force_wake_reset(dev_priv);
 244         } else if (INTEL_INFO(dev)->gen >= 6) {
 245                 __gen6_gt_force_wake_reset(dev_priv);
 246                 if (IS_IVYBRIDGE(dev) || IS_HASWELL(dev))
 247                         __gen6_gt_force_wake_mt_reset(dev_priv);
 248         }
 249 }
 250
 251 void intel_uncore_sanitize(struct drm_device *dev)
 252 {
 253         struct drm_i915_private *dev_priv = dev->dev_private;
 254         u32 reg_val;
 255
 256         intel_uncore_forcewake_reset(dev);
 257
 258         /* BIOS often leaves RC6 enabled, but disable it for hw init */
 259         intel_disable_gt_powersave(dev);
 260
 261         /* Turn off power gate, require especially for the BIOS less system */
 262         if (IS_VALLEYVIEW(dev)) {
 263
 264                 mutex_lock(&dev_priv->rps.hw_lock);
 265                 reg_val = vlv_punit_read(dev_priv, PUNIT_REG_PWRGT_STATUS);
 266
 267                 if (reg_val & (RENDER_PWRGT | MEDIA_PWRGT | DISP2D_PWRGT))
 268                         vlv_punit_write(dev_priv, PUNIT_REG_PWRGT_CTRL, 0x0);
 269
 270                 mutex_unlock(&dev_priv->rps.hw_lock);
 271
 272         }
 273 }
 274
 275 /*
 276  * Generally this is called implicitly by the register read function. However,
 277  * if some sequence requires the GT to not power down then this function should
 278  * be called at the beginning of the sequence followed by a call to
 279  * gen6_gt_force_wake_put() at the end of the sequence.
 280  */
 281 void gen6_gt_force_wake_get(struct drm_i915_private *dev_priv)
 282 {
 283         unsigned long irqflags;
 284
 285         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 286         if (dev_priv->uncore.forcewake_count++ == 0)
 287                 dev_priv->uncore.funcs.force_wake_get(dev_priv);
 288         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 289 }
 290
 291 /*
 292  * see gen6_gt_force_wake_get()
 293  */
 294 void gen6_gt_force_wake_put(struct drm_i915_private *dev_priv)
 295 {
 296         unsigned long irqflags;
 297
 298         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 299         if (--dev_priv->uncore.forcewake_count == 0) {
 300                 dev_priv->uncore.forcewake_count++;
 301                 mod_delayed_work(dev_priv->wq,
 302                                  &dev_priv->uncore.force_wake_work,
 303                                  1);
 304         }
 305         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 306 }
 307
 308 /* We give fast paths for the really cool registers */
 309 #define NEEDS_FORCE_WAKE(dev_priv, reg) \
 310         ((HAS_FORCE_WAKE((dev_priv)->dev)) && \
 311          ((reg) < 0x40000) &&            \
 312          ((reg) != FORCEWAKE))
 313
 314 static void
 315 ilk_dummy_write(struct drm_i915_private *dev_priv)
 316 {
 317         /* WaIssueDummyWriteToWakeupFromRC6:ilk Issue a dummy write to wake up
 318          * the chip from rc6 before touching it for real. MI_MODE is masked,
 319          * hence harmless to write 0 into. */
 320         __raw_i915_write32(dev_priv, MI_MODE, 0);
 321 }
 322
 323 static void
 324 hsw_unclaimed_reg_clear(struct drm_i915_private *dev_priv, u32 reg)
 325 {
 326         if (HAS_FPGA_DBG_UNCLAIMED(dev_priv->dev) &&
 327             (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {
 328                 DRM_ERROR("Unknown unclaimed register before writing to %x\n",
 329                           reg);
 330                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 331         }
 332 }
 333
 334 static void
 335 hsw_unclaimed_reg_check(struct drm_i915_private *dev_priv, u32 reg)
 336 {
 337         if (HAS_FPGA_DBG_UNCLAIMED(dev_priv->dev) &&
 338             (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {
 339                 DRM_ERROR("Unclaimed write to %x\n", reg);
 340                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 341         }
 342 }
 343
 344 #define REG_READ_HEADER(x) \
 345         unsigned long irqflags; \
 346         u##x val = 0; \
 347         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags)
 348
 349 #define REG_READ_FOOTER \
 350         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
 351         trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \
 352         return val
 353
 354 #define __i915_read(x) \
 355 static u##x \
 356 i915_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
 357         REG_READ_HEADER(x); \
 358         if (dev_priv->info->gen == 5) \
 359                 ilk_dummy_write(dev_priv); \
 360         if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
 361                 if (dev_priv->uncore.forcewake_count == 0) \
 362                         dev_priv->uncore.funcs.force_wake_get(dev_priv); \
 363                 val = __raw_i915_read##x(dev_priv, reg); \
 364                 if (dev_priv->uncore.forcewake_count == 0) \
 365                         dev_priv->uncore.funcs.force_wake_put(dev_priv); \
 366         } else { \
 367                 val = __raw_i915_read##x(dev_priv, reg); \
 368         } \
 369         REG_READ_FOOTER; \
 370 }
 371
 372 __i915_read(8)
 373 __i915_read(16)
 374 __i915_read(32)
 375 __i915_read(64)
 376 #undef __i915_read
 377 #undef REG_READ_FOOTER
 378 #undef REG_READ_HEADER
 379
 380 #define REG_WRITE_HEADER \
 381         unsigned long irqflags; \
 382         trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \
 383         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags)
 384
 385 #define __i915_write(x) \
 386 static void \
 387 i915_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
 388         u32 __fifo_ret = 0; \
 389         REG_WRITE_HEADER; \
 390         if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
 391                 __fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
 392         } \
 393         if (dev_priv->info->gen == 5) \
 394                 ilk_dummy_write(dev_priv); \
 395         hsw_unclaimed_reg_clear(dev_priv, reg); \
 396         __raw_i915_write##x(dev_priv, reg, val); \
 397         if (unlikely(__fifo_ret)) { \
 398                 gen6_gt_check_fifodbg(dev_priv); \
 399         } \
 400         hsw_unclaimed_reg_check(dev_priv, reg); \
 401         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
 402 }
 403 __i915_write(8)
 404 __i915_write(16)
 405 __i915_write(32)
 406 __i915_write(64)
 407 #undef __i915_write
 408 #undef REG_WRITE_HEADER
 409
 410 void intel_uncore_init(struct drm_device *dev)
 411 {
 412         struct drm_i915_private *dev_priv = dev->dev_private;
 413
 414         INIT_DELAYED_WORK(&dev_priv->uncore.force_wake_work,
 415                           gen6_force_wake_work);
 416
 417         if (IS_VALLEYVIEW(dev)) {
 418                 dev_priv->uncore.funcs.force_wake_get = vlv_force_wake_get;
 419                 dev_priv->uncore.funcs.force_wake_put = vlv_force_wake_put;
 420         } else if (IS_HASWELL(dev)) {
 421                 dev_priv->uncore.funcs.force_wake_get = __gen6_gt_force_wake_mt_get;
 422                 dev_priv->uncore.funcs.force_wake_put = __gen6_gt_force_wake_mt_put;
 423         } else if (IS_IVYBRIDGE(dev)) {
 424                 u32 ecobus;
 425
 426                 /* IVB configs may use multi-threaded forcewake */
 427
 428                 /* A small trick here - if the bios hasn't configured
 429                  * MT forcewake, and if the device is in RC6, then
 430                  * force_wake_mt_get will not wake the device and the
 431                  * ECOBUS read will return zero. Which will be
 432                  * (correctly) interpreted by the test below as MT
 433                  * forcewake being disabled.
 434                  */
 435                 mutex_lock(&dev->struct_mutex);
 436                 __gen6_gt_force_wake_mt_get(dev_priv);
 437                 ecobus = __raw_i915_read32(dev_priv, ECOBUS);
 438                 __gen6_gt_force_wake_mt_put(dev_priv);
 439                 mutex_unlock(&dev->struct_mutex);
 440
 441                 if (ecobus & FORCEWAKE_MT_ENABLE) {
 442                         dev_priv->uncore.funcs.force_wake_get =
 443                                 __gen6_gt_force_wake_mt_get;
 444                         dev_priv->uncore.funcs.force_wake_put =
 445                                 __gen6_gt_force_wake_mt_put;
 446                 } else {
 447                         DRM_INFO("No MT forcewake available on Ivybridge, this can result in issues\n");
 448                         DRM_INFO("when using vblank-synced partial screen updates.\n");
 449                         dev_priv->uncore.funcs.force_wake_get =
 450                                 __gen6_gt_force_wake_get;
 451                         dev_priv->uncore.funcs.force_wake_put =
 452                                 __gen6_gt_force_wake_put;
 453                 }
 454         } else if (IS_GEN6(dev)) {
 455                 dev_priv->uncore.funcs.force_wake_get =
 456                         __gen6_gt_force_wake_get;
 457                 dev_priv->uncore.funcs.force_wake_put =
 458                         __gen6_gt_force_wake_put;
 459         }
 460
 461         dev_priv->uncore.funcs.mmio_readb  = i915_read8;
 462         dev_priv->uncore.funcs.mmio_readw  = i915_read16;
 463         dev_priv->uncore.funcs.mmio_readl  = i915_read32;
 464         dev_priv->uncore.funcs.mmio_readq  = i915_read64;
 465         dev_priv->uncore.funcs.mmio_writeb = i915_write8;
 466         dev_priv->uncore.funcs.mmio_writew = i915_write16;
 467         dev_priv->uncore.funcs.mmio_writel = i915_write32;
 468         dev_priv->uncore.funcs.mmio_writeq = i915_write64;
 469 }
 470
 471 void intel_uncore_fini(struct drm_device *dev)
 472 {
 473         struct drm_i915_private *dev_priv = dev->dev_private;
 474
 475         flush_delayed_work(&dev_priv->uncore.force_wake_work);
 476
 477         /* Paranoia: make sure we have disabled everything before we exit. */
 478         intel_uncore_sanitize(dev);
 479 }
 480
 481 static const struct register_whitelist {
 482         uint64_t offset;
 483         uint32_t size;
 484         uint32_t gen_bitmask; /* support gens, 0x10 for 4, 0x30 for 4 and 5, etc. */
 485 } whitelist[] = {
 486         { RING_TIMESTAMP(RENDER_RING_BASE), 8, 0xF0 },
 487 };
 488
 489 int i915_reg_read_ioctl(struct drm_device *dev,
 490                         void *data, struct drm_file *file)
 491 {
 492         struct drm_i915_private *dev_priv = dev->dev_private;
 493         struct drm_i915_reg_read *reg = data;
 494         struct register_whitelist const *entry = whitelist;
 495         int i;
 496
 497         for (i = 0; i < ARRAY_SIZE(whitelist); i++, entry++) {
 498                 if (entry->offset == reg->offset &&
 499                     (1 << INTEL_INFO(dev)->gen & entry->gen_bitmask))
 500                         break;
 501         }
 502
 503         if (i == ARRAY_SIZE(whitelist))
 504                 return -EINVAL;
 505
 506         switch (entry->size) {
 507         case 8:
 508                 reg->val = I915_READ64(reg->offset);
 509                 break;
 510         case 4:
 511                 reg->val = I915_READ(reg->offset);
 512                 break;
 513         case 2:
 514                 reg->val = I915_READ16(reg->offset);
 515                 break;
 516         case 1:
 517                 reg->val = I915_READ8(reg->offset);
 518                 break;
 519         default:
 520                 WARN_ON(1);
 521                 return -EINVAL;
 522         }
 523
 524         return 0;
 525 }
 526
 527 static int i965_reset_complete(struct drm_device *dev)
 528 {
 529         u8 gdrst;
 530         pci_read_config_byte(dev->pdev, I965_GDRST, &gdrst);
 531         return (gdrst & GRDOM_RESET_ENABLE) == 0;
 532 }
 533
 534 static int i965_do_reset(struct drm_device *dev)
 535 {
 536         int ret;
 537
 538         /*
 539          * Set the domains we want to reset (GRDOM/bits 2 and 3) as
 540          * well as the reset bit (GR/bit 0).  Setting the GR bit
 541          * triggers the reset; when done, the hardware will clear it.
 542          */
 543         pci_write_config_byte(dev->pdev, I965_GDRST,
 544                               GRDOM_RENDER | GRDOM_RESET_ENABLE);
 545         ret =  wait_for(i965_reset_complete(dev), 500);
 546         if (ret)
 547                 return ret;
 548
 549         /* We can't reset render&media without also resetting display ... */
 550         pci_write_config_byte(dev->pdev, I965_GDRST,
 551                               GRDOM_MEDIA | GRDOM_RESET_ENABLE);
 552
 553         ret =  wait_for(i965_reset_complete(dev), 500);
 554         if (ret)
 555                 return ret;
 556
 557         pci_write_config_byte(dev->pdev, I965_GDRST, 0);
 558
 559         return 0;
 560 }
 561
 562 static int ironlake_do_reset(struct drm_device *dev)
 563 {
 564         struct drm_i915_private *dev_priv = dev->dev_private;
 565         u32 gdrst;
 566         int ret;
 567
 568         gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
 569         gdrst &= ~GRDOM_MASK;
 570         I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
 571                    gdrst | GRDOM_RENDER | GRDOM_RESET_ENABLE);
 572         ret = wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);
 573         if (ret)
 574                 return ret;
 575
 576         /* We can't reset render&media without also resetting display ... */
 577         gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
 578         gdrst &= ~GRDOM_MASK;
 579         I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
 580                    gdrst | GRDOM_MEDIA | GRDOM_RESET_ENABLE);
 581         return wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);
 582 }
 583
 584 static int gen6_do_reset(struct drm_device *dev)
 585 {
 586         struct drm_i915_private *dev_priv = dev->dev_private;
 587         int     ret;
 588         unsigned long irqflags;
 589
 590         /* Hold uncore.lock across reset to prevent any register access
 591          * with forcewake not set correctly
 592          */
 593         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 594
 595         /* Reset the chip */
 596
 597         /* GEN6_GDRST is not in the gt power well, no need to check
 598          * for fifo space for the write or forcewake the chip for
 599          * the read
 600          */
 601         __raw_i915_write32(dev_priv, GEN6_GDRST, GEN6_GRDOM_FULL);
 602
 603         /* Spin waiting for the device to ack the reset request */
 604         ret = wait_for((__raw_i915_read32(dev_priv, GEN6_GDRST) & GEN6_GRDOM_FULL) == 0, 500);
 605
 606         intel_uncore_forcewake_reset(dev);
 607
 608         /* If reset with a user forcewake, try to restore, otherwise turn it off */
 609         if (dev_priv->uncore.forcewake_count)
 610                 dev_priv->uncore.funcs.force_wake_get(dev_priv);
 611         else
 612                 dev_priv->uncore.funcs.force_wake_put(dev_priv);
 613
 614         /* Restore fifo count */
 615         dev_priv->uncore.fifo_count = __raw_i915_read32(dev_priv, GT_FIFO_FREE_ENTRIES);
 616
 617         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 618         return ret;
 619 }
 620
 621 int intel_gpu_reset(struct drm_device *dev)
 622 {
 623         switch (INTEL_INFO(dev)->gen) {
 624         case 7:
 625         case 6: return gen6_do_reset(dev);
 626         case 5: return ironlake_do_reset(dev);
 627         case 4: return i965_do_reset(dev);
 628         default: return -ENODEV;
 629         }
 630 }
 631
 632 void intel_uncore_clear_errors(struct drm_device *dev)
 633 {
 634         struct drm_i915_private *dev_priv = dev->dev_private;
 635
 636         /* XXX needs spinlock around caller's grouping */
 637         if (HAS_FPGA_DBG_UNCLAIMED(dev))
 638                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 639 }
 640
 641 void intel_uncore_check_errors(struct drm_device *dev)
 642 {
 643         struct drm_i915_private *dev_priv = dev->dev_private;
 644
 645         if (HAS_FPGA_DBG_UNCLAIMED(dev) &&
 646             (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {
 647                 DRM_ERROR("Unclaimed register before interrupt\n");
 648                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 649         }
 650 }