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         if (!dev_priv->uncore.funcs.force_wake_get)
 286                 return;
 287
 288         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 289         if (dev_priv->uncore.forcewake_count++ == 0)
 290                 dev_priv->uncore.funcs.force_wake_get(dev_priv);
 291         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 292 }
 293
 294 /*
 295  * see gen6_gt_force_wake_get()
 296  */
 297 void gen6_gt_force_wake_put(struct drm_i915_private *dev_priv)
 298 {
 299         unsigned long irqflags;
 300
 301         if (!dev_priv->uncore.funcs.force_wake_put)
 302                 return;
 303
 304         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 305         if (--dev_priv->uncore.forcewake_count == 0) {
 306                 dev_priv->uncore.forcewake_count++;
 307                 mod_delayed_work(dev_priv->wq,
 308                                  &dev_priv->uncore.force_wake_work,
 309                                  1);
 310         }
 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          ((reg) < 0x40000 && (reg) != FORCEWAKE)
 317
 318 static void
 319 ilk_dummy_write(struct drm_i915_private *dev_priv)
 320 {
 321         /* WaIssueDummyWriteToWakeupFromRC6:ilk Issue a dummy write to wake up
 322          * the chip from rc6 before touching it for real. MI_MODE is masked,
 323          * hence harmless to write 0 into. */
 324         __raw_i915_write32(dev_priv, MI_MODE, 0);
 325 }
 326
 327 static void
 328 hsw_unclaimed_reg_clear(struct drm_i915_private *dev_priv, u32 reg)
 329 {
 330         if (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM) {
 331                 DRM_ERROR("Unknown unclaimed register before writing to %x\n",
 332                           reg);
 333                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 334         }
 335 }
 336
 337 static void
 338 hsw_unclaimed_reg_check(struct drm_i915_private *dev_priv, u32 reg)
 339 {
 340         if (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM) {
 341                 DRM_ERROR("Unclaimed write to %x\n", reg);
 342                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 343         }
 344 }
 345
 346 #define REG_READ_HEADER(x) \
 347         unsigned long irqflags; \
 348         u##x val = 0; \
 349         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags)
 350
 351 #define REG_READ_FOOTER \
 352         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
 353         trace_i915_reg_rw(false, reg, val, sizeof(val), trace); \
 354         return val
 355
 356 #define __gen4_read(x) \
 357 static u##x \
 358 gen4_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
 359         REG_READ_HEADER(x); \
 360         val = __raw_i915_read##x(dev_priv, reg); \
 361         REG_READ_FOOTER; \
 362 }
 363
 364 #define __gen5_read(x) \
 365 static u##x \
 366 gen5_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
 367         REG_READ_HEADER(x); \
 368         ilk_dummy_write(dev_priv); \
 369         val = __raw_i915_read##x(dev_priv, reg); \
 370         REG_READ_FOOTER; \
 371 }
 372
 373 #define __gen6_read(x) \
 374 static u##x \
 375 gen6_read##x(struct drm_i915_private *dev_priv, off_t reg, bool trace) { \
 376         REG_READ_HEADER(x); \
 377         if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
 378                 if (dev_priv->uncore.forcewake_count == 0) \
 379                         dev_priv->uncore.funcs.force_wake_get(dev_priv); \
 380                 val = __raw_i915_read##x(dev_priv, reg); \
 381                 if (dev_priv->uncore.forcewake_count == 0) \
 382                         dev_priv->uncore.funcs.force_wake_put(dev_priv); \
 383         } else { \
 384                 val = __raw_i915_read##x(dev_priv, reg); \
 385         } \
 386         REG_READ_FOOTER; \
 387 }
 388
 389 __gen6_read(8)
 390 __gen6_read(16)
 391 __gen6_read(32)
 392 __gen6_read(64)
 393 __gen5_read(8)
 394 __gen5_read(16)
 395 __gen5_read(32)
 396 __gen5_read(64)
 397 __gen4_read(8)
 398 __gen4_read(16)
 399 __gen4_read(32)
 400 __gen4_read(64)
 401
 402 #undef __gen6_read
 403 #undef __gen5_read
 404 #undef __gen4_read
 405 #undef REG_READ_FOOTER
 406 #undef REG_READ_HEADER
 407
 408 #define REG_WRITE_HEADER \
 409         unsigned long irqflags; \
 410         trace_i915_reg_rw(true, reg, val, sizeof(val), trace); \
 411         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags)
 412
 413 #define __gen4_write(x) \
 414 static void \
 415 gen4_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
 416         REG_WRITE_HEADER; \
 417         __raw_i915_write##x(dev_priv, reg, val); \
 418         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
 419 }
 420
 421 #define __gen5_write(x) \
 422 static void \
 423 gen5_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
 424         REG_WRITE_HEADER; \
 425         ilk_dummy_write(dev_priv); \
 426         __raw_i915_write##x(dev_priv, reg, val); \
 427         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
 428 }
 429
 430 #define __gen6_write(x) \
 431 static void \
 432 gen6_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
 433         u32 __fifo_ret = 0; \
 434         REG_WRITE_HEADER; \
 435         if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
 436                 __fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
 437         } \
 438         __raw_i915_write##x(dev_priv, reg, val); \
 439         if (unlikely(__fifo_ret)) { \
 440                 gen6_gt_check_fifodbg(dev_priv); \
 441         } \
 442         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
 443 }
 444
 445 #define __hsw_write(x) \
 446 static void \
 447 hsw_write##x(struct drm_i915_private *dev_priv, off_t reg, u##x val, bool trace) { \
 448         u32 __fifo_ret = 0; \
 449         REG_WRITE_HEADER; \
 450         if (NEEDS_FORCE_WAKE((dev_priv), (reg))) { \
 451                 __fifo_ret = __gen6_gt_wait_for_fifo(dev_priv); \
 452         } \
 453         hsw_unclaimed_reg_clear(dev_priv, reg); \
 454         __raw_i915_write##x(dev_priv, reg, val); \
 455         if (unlikely(__fifo_ret)) { \
 456                 gen6_gt_check_fifodbg(dev_priv); \
 457         } \
 458         hsw_unclaimed_reg_check(dev_priv, reg); \
 459         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags); \
 460 }
 461
 462 __hsw_write(8)
 463 __hsw_write(16)
 464 __hsw_write(32)
 465 __hsw_write(64)
 466 __gen6_write(8)
 467 __gen6_write(16)
 468 __gen6_write(32)
 469 __gen6_write(64)
 470 __gen5_write(8)
 471 __gen5_write(16)
 472 __gen5_write(32)
 473 __gen5_write(64)
 474 __gen4_write(8)
 475 __gen4_write(16)
 476 __gen4_write(32)
 477 __gen4_write(64)
 478
 479 #undef __hsw_write
 480 #undef __gen6_write
 481 #undef __gen5_write
 482 #undef __gen4_write
 483 #undef REG_WRITE_HEADER
 484
 485 void intel_uncore_init(struct drm_device *dev)
 486 {
 487         struct drm_i915_private *dev_priv = dev->dev_private;
 488
 489         INIT_DELAYED_WORK(&dev_priv->uncore.force_wake_work,
 490                           gen6_force_wake_work);
 491
 492         if (IS_VALLEYVIEW(dev)) {
 493                 dev_priv->uncore.funcs.force_wake_get = vlv_force_wake_get;
 494                 dev_priv->uncore.funcs.force_wake_put = vlv_force_wake_put;
 495         } else if (IS_HASWELL(dev)) {
 496                 dev_priv->uncore.funcs.force_wake_get = __gen6_gt_force_wake_mt_get;
 497                 dev_priv->uncore.funcs.force_wake_put = __gen6_gt_force_wake_mt_put;
 498         } else if (IS_IVYBRIDGE(dev)) {
 499                 u32 ecobus;
 500
 501                 /* IVB configs may use multi-threaded forcewake */
 502
 503                 /* A small trick here - if the bios hasn't configured
 504                  * MT forcewake, and if the device is in RC6, then
 505                  * force_wake_mt_get will not wake the device and the
 506                  * ECOBUS read will return zero. Which will be
 507                  * (correctly) interpreted by the test below as MT
 508                  * forcewake being disabled.
 509                  */
 510                 mutex_lock(&dev->struct_mutex);
 511                 __gen6_gt_force_wake_mt_get(dev_priv);
 512                 ecobus = __raw_i915_read32(dev_priv, ECOBUS);
 513                 __gen6_gt_force_wake_mt_put(dev_priv);
 514                 mutex_unlock(&dev->struct_mutex);
 515
 516                 if (ecobus & FORCEWAKE_MT_ENABLE) {
 517                         dev_priv->uncore.funcs.force_wake_get =
 518                                 __gen6_gt_force_wake_mt_get;
 519                         dev_priv->uncore.funcs.force_wake_put =
 520                                 __gen6_gt_force_wake_mt_put;
 521                 } else {
 522                         DRM_INFO("No MT forcewake available on Ivybridge, this can result in issues\n");
 523                         DRM_INFO("when using vblank-synced partial screen updates.\n");
 524                         dev_priv->uncore.funcs.force_wake_get =
 525                                 __gen6_gt_force_wake_get;
 526                         dev_priv->uncore.funcs.force_wake_put =
 527                                 __gen6_gt_force_wake_put;
 528                 }
 529         } else if (IS_GEN6(dev)) {
 530                 dev_priv->uncore.funcs.force_wake_get =
 531                         __gen6_gt_force_wake_get;
 532                 dev_priv->uncore.funcs.force_wake_put =
 533                         __gen6_gt_force_wake_put;
 534         }
 535
 536         switch (INTEL_INFO(dev)->gen) {
 537         case 7:
 538         case 6:
 539                 if (IS_HASWELL(dev)) {
 540                         dev_priv->uncore.funcs.mmio_writeb  = hsw_write8;
 541                         dev_priv->uncore.funcs.mmio_writew  = hsw_write16;
 542                         dev_priv->uncore.funcs.mmio_writel  = hsw_write32;
 543                         dev_priv->uncore.funcs.mmio_writeq  = hsw_write64;
 544                 } else {
 545                         dev_priv->uncore.funcs.mmio_writeb  = gen6_write8;
 546                         dev_priv->uncore.funcs.mmio_writew  = gen6_write16;
 547                         dev_priv->uncore.funcs.mmio_writel  = gen6_write32;
 548                         dev_priv->uncore.funcs.mmio_writeq  = gen6_write64;
 549                 }
 550                 dev_priv->uncore.funcs.mmio_readb  = gen6_read8;
 551                 dev_priv->uncore.funcs.mmio_readw  = gen6_read16;
 552                 dev_priv->uncore.funcs.mmio_readl  = gen6_read32;
 553                 dev_priv->uncore.funcs.mmio_readq  = gen6_read64;
 554                 break;
 555         case 5:
 556                 dev_priv->uncore.funcs.mmio_writeb  = gen5_write8;
 557                 dev_priv->uncore.funcs.mmio_writew  = gen5_write16;
 558                 dev_priv->uncore.funcs.mmio_writel  = gen5_write32;
 559                 dev_priv->uncore.funcs.mmio_writeq  = gen5_write64;
 560                 dev_priv->uncore.funcs.mmio_readb  = gen5_read8;
 561                 dev_priv->uncore.funcs.mmio_readw  = gen5_read16;
 562                 dev_priv->uncore.funcs.mmio_readl  = gen5_read32;
 563                 dev_priv->uncore.funcs.mmio_readq  = gen5_read64;
 564                 break;
 565         case 4:
 566         case 3:
 567         case 2:
 568                 dev_priv->uncore.funcs.mmio_writeb  = gen4_write8;
 569                 dev_priv->uncore.funcs.mmio_writew  = gen4_write16;
 570                 dev_priv->uncore.funcs.mmio_writel  = gen4_write32;
 571                 dev_priv->uncore.funcs.mmio_writeq  = gen4_write64;
 572                 dev_priv->uncore.funcs.mmio_readb  = gen4_read8;
 573                 dev_priv->uncore.funcs.mmio_readw  = gen4_read16;
 574                 dev_priv->uncore.funcs.mmio_readl  = gen4_read32;
 575                 dev_priv->uncore.funcs.mmio_readq  = gen4_read64;
 576                 break;
 577         }
 578 }
 579
 580 void intel_uncore_fini(struct drm_device *dev)
 581 {
 582         struct drm_i915_private *dev_priv = dev->dev_private;
 583
 584         flush_delayed_work(&dev_priv->uncore.force_wake_work);
 585
 586         /* Paranoia: make sure we have disabled everything before we exit. */
 587         intel_uncore_sanitize(dev);
 588 }
 589
 590 static const struct register_whitelist {
 591         uint64_t offset;
 592         uint32_t size;
 593         uint32_t gen_bitmask; /* support gens, 0x10 for 4, 0x30 for 4 and 5, etc. */
 594 } whitelist[] = {
 595         { RING_TIMESTAMP(RENDER_RING_BASE), 8, 0xF0 },
 596 };
 597
 598 int i915_reg_read_ioctl(struct drm_device *dev,
 599                         void *data, struct drm_file *file)
 600 {
 601         struct drm_i915_private *dev_priv = dev->dev_private;
 602         struct drm_i915_reg_read *reg = data;
 603         struct register_whitelist const *entry = whitelist;
 604         int i;
 605
 606         for (i = 0; i < ARRAY_SIZE(whitelist); i++, entry++) {
 607                 if (entry->offset == reg->offset &&
 608                     (1 << INTEL_INFO(dev)->gen & entry->gen_bitmask))
 609                         break;
 610         }
 611
 612         if (i == ARRAY_SIZE(whitelist))
 613                 return -EINVAL;
 614
 615         switch (entry->size) {
 616         case 8:
 617                 reg->val = I915_READ64(reg->offset);
 618                 break;
 619         case 4:
 620                 reg->val = I915_READ(reg->offset);
 621                 break;
 622         case 2:
 623                 reg->val = I915_READ16(reg->offset);
 624                 break;
 625         case 1:
 626                 reg->val = I915_READ8(reg->offset);
 627                 break;
 628         default:
 629                 WARN_ON(1);
 630                 return -EINVAL;
 631         }
 632
 633         return 0;
 634 }
 635
 636 static int i965_reset_complete(struct drm_device *dev)
 637 {
 638         u8 gdrst;
 639         pci_read_config_byte(dev->pdev, I965_GDRST, &gdrst);
 640         return (gdrst & GRDOM_RESET_ENABLE) == 0;
 641 }
 642
 643 static int i965_do_reset(struct drm_device *dev)
 644 {
 645         int ret;
 646
 647         /*
 648          * Set the domains we want to reset (GRDOM/bits 2 and 3) as
 649          * well as the reset bit (GR/bit 0).  Setting the GR bit
 650          * triggers the reset; when done, the hardware will clear it.
 651          */
 652         pci_write_config_byte(dev->pdev, I965_GDRST,
 653                               GRDOM_RENDER | GRDOM_RESET_ENABLE);
 654         ret =  wait_for(i965_reset_complete(dev), 500);
 655         if (ret)
 656                 return ret;
 657
 658         /* We can't reset render&media without also resetting display ... */
 659         pci_write_config_byte(dev->pdev, I965_GDRST,
 660                               GRDOM_MEDIA | GRDOM_RESET_ENABLE);
 661
 662         ret =  wait_for(i965_reset_complete(dev), 500);
 663         if (ret)
 664                 return ret;
 665
 666         pci_write_config_byte(dev->pdev, I965_GDRST, 0);
 667
 668         return 0;
 669 }
 670
 671 static int ironlake_do_reset(struct drm_device *dev)
 672 {
 673         struct drm_i915_private *dev_priv = dev->dev_private;
 674         u32 gdrst;
 675         int ret;
 676
 677         gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
 678         gdrst &= ~GRDOM_MASK;
 679         I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
 680                    gdrst | GRDOM_RENDER | GRDOM_RESET_ENABLE);
 681         ret = wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);
 682         if (ret)
 683                 return ret;
 684
 685         /* We can't reset render&media without also resetting display ... */
 686         gdrst = I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR);
 687         gdrst &= ~GRDOM_MASK;
 688         I915_WRITE(MCHBAR_MIRROR_BASE + ILK_GDSR,
 689                    gdrst | GRDOM_MEDIA | GRDOM_RESET_ENABLE);
 690         return wait_for(I915_READ(MCHBAR_MIRROR_BASE + ILK_GDSR) & 0x1, 500);
 691 }
 692
 693 static int gen6_do_reset(struct drm_device *dev)
 694 {
 695         struct drm_i915_private *dev_priv = dev->dev_private;
 696         int     ret;
 697         unsigned long irqflags;
 698
 699         /* Hold uncore.lock across reset to prevent any register access
 700          * with forcewake not set correctly
 701          */
 702         spin_lock_irqsave(&dev_priv->uncore.lock, irqflags);
 703
 704         /* Reset the chip */
 705
 706         /* GEN6_GDRST is not in the gt power well, no need to check
 707          * for fifo space for the write or forcewake the chip for
 708          * the read
 709          */
 710         __raw_i915_write32(dev_priv, GEN6_GDRST, GEN6_GRDOM_FULL);
 711
 712         /* Spin waiting for the device to ack the reset request */
 713         ret = wait_for((__raw_i915_read32(dev_priv, GEN6_GDRST) & GEN6_GRDOM_FULL) == 0, 500);
 714
 715         intel_uncore_forcewake_reset(dev);
 716
 717         /* If reset with a user forcewake, try to restore, otherwise turn it off */
 718         if (dev_priv->uncore.forcewake_count)
 719                 dev_priv->uncore.funcs.force_wake_get(dev_priv);
 720         else
 721                 dev_priv->uncore.funcs.force_wake_put(dev_priv);
 722
 723         /* Restore fifo count */
 724         dev_priv->uncore.fifo_count = __raw_i915_read32(dev_priv, GT_FIFO_FREE_ENTRIES);
 725
 726         spin_unlock_irqrestore(&dev_priv->uncore.lock, irqflags);
 727         return ret;
 728 }
 729
 730 int intel_gpu_reset(struct drm_device *dev)
 731 {
 732         switch (INTEL_INFO(dev)->gen) {
 733         case 7:
 734         case 6: return gen6_do_reset(dev);
 735         case 5: return ironlake_do_reset(dev);
 736         case 4: return i965_do_reset(dev);
 737         default: return -ENODEV;
 738         }
 739 }
 740
 741 void intel_uncore_clear_errors(struct drm_device *dev)
 742 {
 743         struct drm_i915_private *dev_priv = dev->dev_private;
 744
 745         /* XXX needs spinlock around caller's grouping */
 746         if (HAS_FPGA_DBG_UNCLAIMED(dev))
 747                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 748 }
 749
 750 void intel_uncore_check_errors(struct drm_device *dev)
 751 {
 752         struct drm_i915_private *dev_priv = dev->dev_private;
 753
 754         if (HAS_FPGA_DBG_UNCLAIMED(dev) &&
 755             (__raw_i915_read32(dev_priv, FPGA_DBG) & FPGA_DBG_RM_NOCLAIM)) {
 756                 DRM_ERROR("Unclaimed register before interrupt\n");
 757                 __raw_i915_write32(dev_priv, FPGA_DBG, FPGA_DBG_RM_NOCLAIM);
 758         }
 759 }