drivers/gpu/drm/i915/i915_irq.c

   1 /* i915_irq.c -- IRQ support for the I915 -*- linux-c -*-
   2  */
   3 /*
   4  * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
   5  * All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  */
  28
  29 #include <linux/sysrq.h>
  30 #include "drmP.h"
  31 #include "drm.h"
  32 #include "i915_drm.h"
  33 #include "i915_drv.h"
  34 #include "intel_drv.h"
  35
  36 #define MAX_NOPID ((u32)~0)
  37
  38 /**
  39  * Interrupts that are always left unmasked.
  40  *
  41  * Since pipe events are edge-triggered from the PIPESTAT register to IIR,
  42  * we leave them always unmasked in IMR and then control enabling them through
  43  * PIPESTAT alone.
  44  */
  45 #define I915_INTERRUPT_ENABLE_FIX (I915_ASLE_INTERRUPT |                 \
  46                                    I915_DISPLAY_PIPE_A_EVENT_INTERRUPT | \
  47                                    I915_DISPLAY_PIPE_B_EVENT_INTERRUPT | \
  48                                    I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
  49
  50 /** Interrupts that we mask and unmask at runtime. */
  51 #define I915_INTERRUPT_ENABLE_VAR (I915_USER_INTERRUPT)
  52
  53 #define I915_PIPE_VBLANK_STATUS (PIPE_START_VBLANK_INTERRUPT_STATUS |\
  54                                  PIPE_VBLANK_INTERRUPT_STATUS)
  55
  56 #define I915_PIPE_VBLANK_ENABLE (PIPE_START_VBLANK_INTERRUPT_ENABLE |\
  57                                  PIPE_VBLANK_INTERRUPT_ENABLE)
  58
  59 #define DRM_I915_VBLANK_PIPE_ALL        (DRM_I915_VBLANK_PIPE_A | \
  60                                          DRM_I915_VBLANK_PIPE_B)
  61
  62 void
  63 igdng_enable_graphics_irq(drm_i915_private_t *dev_priv, u32 mask)
  64 {
  65         if ((dev_priv->gt_irq_mask_reg & mask) != 0) {
  66                 dev_priv->gt_irq_mask_reg &= ~mask;
  67                 I915_WRITE(GTIMR, dev_priv->gt_irq_mask_reg);
  68                 (void) I915_READ(GTIMR);
  69         }
  70 }
  71
  72 static inline void
  73 igdng_disable_graphics_irq(drm_i915_private_t *dev_priv, u32 mask)
  74 {
  75         if ((dev_priv->gt_irq_mask_reg & mask) != mask) {
  76                 dev_priv->gt_irq_mask_reg |= mask;
  77                 I915_WRITE(GTIMR, dev_priv->gt_irq_mask_reg);
  78                 (void) I915_READ(GTIMR);
  79         }
  80 }
  81
  82 /* For display hotplug interrupt */
  83 void
  84 igdng_enable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
  85 {
  86         if ((dev_priv->irq_mask_reg & mask) != 0) {
  87                 dev_priv->irq_mask_reg &= ~mask;
  88                 I915_WRITE(DEIMR, dev_priv->irq_mask_reg);
  89                 (void) I915_READ(DEIMR);
  90         }
  91 }
  92
  93 static inline void
  94 igdng_disable_display_irq(drm_i915_private_t *dev_priv, u32 mask)
  95 {
  96         if ((dev_priv->irq_mask_reg & mask) != mask) {
  97                 dev_priv->irq_mask_reg |= mask;
  98                 I915_WRITE(DEIMR, dev_priv->irq_mask_reg);
  99                 (void) I915_READ(DEIMR);
 100         }
 101 }
 102
 103 void
 104 i915_enable_irq(drm_i915_private_t *dev_priv, u32 mask)
 105 {
 106         if ((dev_priv->irq_mask_reg & mask) != 0) {
 107                 dev_priv->irq_mask_reg &= ~mask;
 108                 I915_WRITE(IMR, dev_priv->irq_mask_reg);
 109                 (void) I915_READ(IMR);
 110         }
 111 }
 112
 113 static inline void
 114 i915_disable_irq(drm_i915_private_t *dev_priv, u32 mask)
 115 {
 116         if ((dev_priv->irq_mask_reg & mask) != mask) {
 117                 dev_priv->irq_mask_reg |= mask;
 118                 I915_WRITE(IMR, dev_priv->irq_mask_reg);
 119                 (void) I915_READ(IMR);
 120         }
 121 }
 122
 123 static inline u32
 124 i915_pipestat(int pipe)
 125 {
 126         if (pipe == 0)
 127                 return PIPEASTAT;
 128         if (pipe == 1)
 129                 return PIPEBSTAT;
 130         BUG();
 131 }
 132
 133 void
 134 i915_enable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
 135 {
 136         if ((dev_priv->pipestat[pipe] & mask) != mask) {
 137                 u32 reg = i915_pipestat(pipe);
 138
 139                 dev_priv->pipestat[pipe] |= mask;
 140                 /* Enable the interrupt, clear any pending status */
 141                 I915_WRITE(reg, dev_priv->pipestat[pipe] | (mask >> 16));
 142                 (void) I915_READ(reg);
 143         }
 144 }
 145
 146 void
 147 i915_disable_pipestat(drm_i915_private_t *dev_priv, int pipe, u32 mask)
 148 {
 149         if ((dev_priv->pipestat[pipe] & mask) != 0) {
 150                 u32 reg = i915_pipestat(pipe);
 151
 152                 dev_priv->pipestat[pipe] &= ~mask;
 153                 I915_WRITE(reg, dev_priv->pipestat[pipe]);
 154                 (void) I915_READ(reg);
 155         }
 156 }
 157
 158 /**
 159  * i915_pipe_enabled - check if a pipe is enabled
 160  * @dev: DRM device
 161  * @pipe: pipe to check
 162  *
 163  * Reading certain registers when the pipe is disabled can hang the chip.
 164  * Use this routine to make sure the PLL is running and the pipe is active
 165  * before reading such registers if unsure.
 166  */
 167 static int
 168 i915_pipe_enabled(struct drm_device *dev, int pipe)
 169 {
 170         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 171         unsigned long pipeconf = pipe ? PIPEBCONF : PIPEACONF;
 172
 173         if (I915_READ(pipeconf) & PIPEACONF_ENABLE)
 174                 return 1;
 175
 176         return 0;
 177 }
 178
 179 /* Called from drm generic code, passed a 'crtc', which
 180  * we use as a pipe index
 181  */
 182 u32 i915_get_vblank_counter(struct drm_device *dev, int pipe)
 183 {
 184         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 185         unsigned long high_frame;
 186         unsigned long low_frame;
 187         u32 high1, high2, low, count;
 188
 189         high_frame = pipe ? PIPEBFRAMEHIGH : PIPEAFRAMEHIGH;
 190         low_frame = pipe ? PIPEBFRAMEPIXEL : PIPEAFRAMEPIXEL;
 191
 192         if (!i915_pipe_enabled(dev, pipe)) {
 193                 DRM_DEBUG("trying to get vblank count for disabled pipe %d\n", pipe);
 194                 return 0;
 195         }
 196
 197         /*
 198          * High & low register fields aren't synchronized, so make sure
 199          * we get a low value that's stable across two reads of the high
 200          * register.
 201          */
 202         do {
 203                 high1 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
 204                          PIPE_FRAME_HIGH_SHIFT);
 205                 low =  ((I915_READ(low_frame) & PIPE_FRAME_LOW_MASK) >>
 206                         PIPE_FRAME_LOW_SHIFT);
 207                 high2 = ((I915_READ(high_frame) & PIPE_FRAME_HIGH_MASK) >>
 208                          PIPE_FRAME_HIGH_SHIFT);
 209         } while (high1 != high2);
 210
 211         count = (high1 << 8) | low;
 212
 213         return count;
 214 }
 215
 216 u32 gm45_get_vblank_counter(struct drm_device *dev, int pipe)
 217 {
 218         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 219         int reg = pipe ? PIPEB_FRMCOUNT_GM45 : PIPEA_FRMCOUNT_GM45;
 220
 221         if (!i915_pipe_enabled(dev, pipe)) {
 222                 DRM_DEBUG("trying to get vblank count for disabled pipe %d\n", pipe);
 223                 return 0;
 224         }
 225
 226         return I915_READ(reg);
 227 }
 228
 229 /*
 230  * Handle hotplug events outside the interrupt handler proper.
 231  */
 232 static void i915_hotplug_work_func(struct work_struct *work)
 233 {
 234         drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
 235                                                     hotplug_work);
 236         struct drm_device *dev = dev_priv->dev;
 237         struct drm_mode_config *mode_config = &dev->mode_config;
 238         struct drm_connector *connector;
 239
 240         if (mode_config->num_connector) {
 241                 list_for_each_entry(connector, &mode_config->connector_list, head) {
 242                         struct intel_output *intel_output = to_intel_output(connector);
 243
 244                         if (intel_output->hot_plug)
 245                                 (*intel_output->hot_plug) (intel_output);
 246                 }
 247         }
 248         /* Just fire off a uevent and let userspace tell us what to do */
 249         drm_sysfs_hotplug_event(dev);
 250 }
 251
 252 irqreturn_t igdng_irq_handler(struct drm_device *dev)
 253 {
 254         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 255         int ret = IRQ_NONE;
 256         u32 de_iir, gt_iir;
 257         u32 new_de_iir, new_gt_iir;
 258         struct drm_i915_master_private *master_priv;
 259
 260         de_iir = I915_READ(DEIIR);
 261         gt_iir = I915_READ(GTIIR);
 262
 263         for (;;) {
 264                 if (de_iir == 0 && gt_iir == 0)
 265                         break;
 266
 267                 ret = IRQ_HANDLED;
 268
 269                 I915_WRITE(DEIIR, de_iir);
 270                 new_de_iir = I915_READ(DEIIR);
 271                 I915_WRITE(GTIIR, gt_iir);
 272                 new_gt_iir = I915_READ(GTIIR);
 273
 274                 if (dev->primary->master) {
 275                         master_priv = dev->primary->master->driver_priv;
 276                         if (master_priv->sarea_priv)
 277                                 master_priv->sarea_priv->last_dispatch =
 278                                         READ_BREADCRUMB(dev_priv);
 279                 }
 280
 281                 if (gt_iir & GT_USER_INTERRUPT) {
 282                         dev_priv->mm.irq_gem_seqno = i915_get_gem_seqno(dev);
 283                         DRM_WAKEUP(&dev_priv->irq_queue);
 284                 }
 285
 286                 de_iir = new_de_iir;
 287                 gt_iir = new_gt_iir;
 288         }
 289
 290         return ret;
 291 }
 292
 293 /**
 294  * i915_error_work_func - do process context error handling work
 295  * @work: work struct
 296  *
 297  * Fire an error uevent so userspace can see that a hang or error
 298  * was detected.
 299  */
 300 static void i915_error_work_func(struct work_struct *work)
 301 {
 302         drm_i915_private_t *dev_priv = container_of(work, drm_i915_private_t,
 303                                                     error_work);
 304         struct drm_device *dev = dev_priv->dev;
 305         char *event_string = "ERROR=1";
 306         char *envp[] = { event_string, NULL };
 307
 308         DRM_DEBUG("generating error event\n");
 309
 310         kobject_uevent_env(&dev->primary->kdev.kobj, KOBJ_CHANGE, envp);
 311 }
 312
 313 /**
 314  * i915_capture_error_state - capture an error record for later analysis
 315  * @dev: drm device
 316  *
 317  * Should be called when an error is detected (either a hang or an error
 318  * interrupt) to capture error state from the time of the error.  Fills
 319  * out a structure which becomes available in debugfs for user level tools
 320  * to pick up.
 321  */
 322 static void i915_capture_error_state(struct drm_device *dev)
 323 {
 324         struct drm_i915_private *dev_priv = dev->dev_private;
 325         struct drm_i915_error_state *error;
 326         unsigned long flags;
 327
 328         spin_lock_irqsave(&dev_priv->error_lock, flags);
 329         if (dev_priv->first_error)
 330                 goto out;
 331
 332         error = kmalloc(sizeof(*error), GFP_ATOMIC);
 333         if (!error) {
 334                 DRM_DEBUG("out ot memory, not capturing error state\n");
 335                 goto out;
 336         }
 337
 338         error->eir = I915_READ(EIR);
 339         error->pgtbl_er = I915_READ(PGTBL_ER);
 340         error->pipeastat = I915_READ(PIPEASTAT);
 341         error->pipebstat = I915_READ(PIPEBSTAT);
 342         error->instpm = I915_READ(INSTPM);
 343         if (!IS_I965G(dev)) {
 344                 error->ipeir = I915_READ(IPEIR);
 345                 error->ipehr = I915_READ(IPEHR);
 346                 error->instdone = I915_READ(INSTDONE);
 347                 error->acthd = I915_READ(ACTHD);
 348         } else {
 349                 error->ipeir = I915_READ(IPEIR_I965);
 350                 error->ipehr = I915_READ(IPEHR_I965);
 351                 error->instdone = I915_READ(INSTDONE_I965);
 352                 error->instps = I915_READ(INSTPS);
 353                 error->instdone1 = I915_READ(INSTDONE1);
 354                 error->acthd = I915_READ(ACTHD_I965);
 355         }
 356
 357         do_gettimeofday(&error->time);
 358
 359         dev_priv->first_error = error;
 360
 361 out:
 362         spin_unlock_irqrestore(&dev_priv->error_lock, flags);
 363 }
 364
 365 /**
 366  * i915_handle_error - handle an error interrupt
 367  * @dev: drm device
 368  *
 369  * Do some basic checking of regsiter state at error interrupt time and
 370  * dump it to the syslog.  Also call i915_capture_error_state() to make
 371  * sure we get a record and make it available in debugfs.  Fire a uevent
 372  * so userspace knows something bad happened (should trigger collection
 373  * of a ring dump etc.).
 374  */
 375 static void i915_handle_error(struct drm_device *dev)
 376 {
 377         struct drm_i915_private *dev_priv = dev->dev_private;
 378         u32 eir = I915_READ(EIR);
 379         u32 pipea_stats = I915_READ(PIPEASTAT);
 380         u32 pipeb_stats = I915_READ(PIPEBSTAT);
 381
 382         i915_capture_error_state(dev);
 383
 384         printk(KERN_ERR "render error detected, EIR: 0x%08x\n",
 385                eir);
 386
 387         if (IS_G4X(dev)) {
 388                 if (eir & (GM45_ERROR_MEM_PRIV | GM45_ERROR_CP_PRIV)) {
 389                         u32 ipeir = I915_READ(IPEIR_I965);
 390
 391                         printk(KERN_ERR "  IPEIR: 0x%08x\n",
 392                                I915_READ(IPEIR_I965));
 393                         printk(KERN_ERR "  IPEHR: 0x%08x\n",
 394                                I915_READ(IPEHR_I965));
 395                         printk(KERN_ERR "  INSTDONE: 0x%08x\n",
 396                                I915_READ(INSTDONE_I965));
 397                         printk(KERN_ERR "  INSTPS: 0x%08x\n",
 398                                I915_READ(INSTPS));
 399                         printk(KERN_ERR "  INSTDONE1: 0x%08x\n",
 400                                I915_READ(INSTDONE1));
 401                         printk(KERN_ERR "  ACTHD: 0x%08x\n",
 402                                I915_READ(ACTHD_I965));
 403                         I915_WRITE(IPEIR_I965, ipeir);
 404                         (void)I915_READ(IPEIR_I965);
 405                 }
 406                 if (eir & GM45_ERROR_PAGE_TABLE) {
 407                         u32 pgtbl_err = I915_READ(PGTBL_ER);
 408                         printk(KERN_ERR "page table error\n");
 409                         printk(KERN_ERR "  PGTBL_ER: 0x%08x\n",
 410                                pgtbl_err);
 411                         I915_WRITE(PGTBL_ER, pgtbl_err);
 412                         (void)I915_READ(PGTBL_ER);
 413                 }
 414         }
 415
 416         if (IS_I9XX(dev)) {
 417                 if (eir & I915_ERROR_PAGE_TABLE) {
 418                         u32 pgtbl_err = I915_READ(PGTBL_ER);
 419                         printk(KERN_ERR "page table error\n");
 420                         printk(KERN_ERR "  PGTBL_ER: 0x%08x\n",
 421                                pgtbl_err);
 422                         I915_WRITE(PGTBL_ER, pgtbl_err);
 423                         (void)I915_READ(PGTBL_ER);
 424                 }
 425         }
 426
 427         if (eir & I915_ERROR_MEMORY_REFRESH) {
 428                 printk(KERN_ERR "memory refresh error\n");
 429                 printk(KERN_ERR "PIPEASTAT: 0x%08x\n",
 430                        pipea_stats);
 431                 printk(KERN_ERR "PIPEBSTAT: 0x%08x\n",
 432                        pipeb_stats);
 433                 /* pipestat has already been acked */
 434         }
 435         if (eir & I915_ERROR_INSTRUCTION) {
 436                 printk(KERN_ERR "instruction error\n");
 437                 printk(KERN_ERR "  INSTPM: 0x%08x\n",
 438                        I915_READ(INSTPM));
 439                 if (!IS_I965G(dev)) {
 440                         u32 ipeir = I915_READ(IPEIR);
 441
 442                         printk(KERN_ERR "  IPEIR: 0x%08x\n",
 443                                I915_READ(IPEIR));
 444                         printk(KERN_ERR "  IPEHR: 0x%08x\n",
 445                                I915_READ(IPEHR));
 446                         printk(KERN_ERR "  INSTDONE: 0x%08x\n",
 447                                I915_READ(INSTDONE));
 448                         printk(KERN_ERR "  ACTHD: 0x%08x\n",
 449                                I915_READ(ACTHD));
 450                         I915_WRITE(IPEIR, ipeir);
 451                         (void)I915_READ(IPEIR);
 452                 } else {
 453                         u32 ipeir = I915_READ(IPEIR_I965);
 454
 455                         printk(KERN_ERR "  IPEIR: 0x%08x\n",
 456                                I915_READ(IPEIR_I965));
 457                         printk(KERN_ERR "  IPEHR: 0x%08x\n",
 458                                I915_READ(IPEHR_I965));
 459                         printk(KERN_ERR "  INSTDONE: 0x%08x\n",
 460                                I915_READ(INSTDONE_I965));
 461                         printk(KERN_ERR "  INSTPS: 0x%08x\n",
 462                                I915_READ(INSTPS));
 463                         printk(KERN_ERR "  INSTDONE1: 0x%08x\n",
 464                                I915_READ(INSTDONE1));
 465                         printk(KERN_ERR "  ACTHD: 0x%08x\n",
 466                                I915_READ(ACTHD_I965));
 467                         I915_WRITE(IPEIR_I965, ipeir);
 468                         (void)I915_READ(IPEIR_I965);
 469                 }
 470         }
 471
 472         I915_WRITE(EIR, eir);
 473         (void)I915_READ(EIR);
 474         eir = I915_READ(EIR);
 475         if (eir) {
 476                 /*
 477                  * some errors might have become stuck,
 478                  * mask them.
 479                  */
 480                 DRM_ERROR("EIR stuck: 0x%08x, masking\n", eir);
 481                 I915_WRITE(EMR, I915_READ(EMR) | eir);
 482                 I915_WRITE(IIR, I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT);
 483         }
 484
 485         queue_work(dev_priv->wq, &dev_priv->error_work);
 486 }
 487
 488 irqreturn_t i915_driver_irq_handler(DRM_IRQ_ARGS)
 489 {
 490         struct drm_device *dev = (struct drm_device *) arg;
 491         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 492         struct drm_i915_master_private *master_priv;
 493         u32 iir, new_iir;
 494         u32 pipea_stats, pipeb_stats;
 495         u32 vblank_status;
 496         u32 vblank_enable;
 497         int vblank = 0;
 498         unsigned long irqflags;
 499         int irq_received;
 500         int ret = IRQ_NONE;
 501
 502         atomic_inc(&dev_priv->irq_received);
 503
 504         if (IS_IGDNG(dev))
 505                 return igdng_irq_handler(dev);
 506
 507         iir = I915_READ(IIR);
 508
 509         if (IS_I965G(dev)) {
 510                 vblank_status = I915_START_VBLANK_INTERRUPT_STATUS;
 511                 vblank_enable = PIPE_START_VBLANK_INTERRUPT_ENABLE;
 512         } else {
 513                 vblank_status = I915_VBLANK_INTERRUPT_STATUS;
 514                 vblank_enable = I915_VBLANK_INTERRUPT_ENABLE;
 515         }
 516
 517         for (;;) {
 518                 irq_received = iir != 0;
 519
 520                 /* Can't rely on pipestat interrupt bit in iir as it might
 521                  * have been cleared after the pipestat interrupt was received.
 522                  * It doesn't set the bit in iir again, but it still produces
 523                  * interrupts (for non-MSI).
 524                  */
 525                 spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 526                 pipea_stats = I915_READ(PIPEASTAT);
 527                 pipeb_stats = I915_READ(PIPEBSTAT);
 528
 529                 if (iir & I915_RENDER_COMMAND_PARSER_ERROR_INTERRUPT)
 530                         i915_handle_error(dev);
 531
 532                 /*
 533                  * Clear the PIPE(A|B)STAT regs before the IIR
 534                  */
 535                 if (pipea_stats & 0x8000ffff) {
 536                         if (pipea_stats &  PIPE_FIFO_UNDERRUN_STATUS)
 537                                 DRM_DEBUG("pipe a underrun\n");
 538                         I915_WRITE(PIPEASTAT, pipea_stats);
 539                         irq_received = 1;
 540                 }
 541
 542                 if (pipeb_stats & 0x8000ffff) {
 543                         if (pipeb_stats &  PIPE_FIFO_UNDERRUN_STATUS)
 544                                 DRM_DEBUG("pipe b underrun\n");
 545                         I915_WRITE(PIPEBSTAT, pipeb_stats);
 546                         irq_received = 1;
 547                 }
 548                 spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 549
 550                 if (!irq_received)
 551                         break;
 552
 553                 ret = IRQ_HANDLED;
 554
 555                 /* Consume port.  Then clear IIR or we'll miss events */
 556                 if ((I915_HAS_HOTPLUG(dev)) &&
 557                     (iir & I915_DISPLAY_PORT_INTERRUPT)) {
 558                         u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT);
 559
 560                         DRM_DEBUG("hotplug event received, stat 0x%08x\n",
 561                                   hotplug_status);
 562                         if (hotplug_status & dev_priv->hotplug_supported_mask)
 563                                 queue_work(dev_priv->wq,
 564                                            &dev_priv->hotplug_work);
 565
 566                         I915_WRITE(PORT_HOTPLUG_STAT, hotplug_status);
 567                         I915_READ(PORT_HOTPLUG_STAT);
 568                 }
 569
 570                 I915_WRITE(IIR, iir);
 571                 new_iir = I915_READ(IIR); /* Flush posted writes */
 572
 573                 if (dev->primary->master) {
 574                         master_priv = dev->primary->master->driver_priv;
 575                         if (master_priv->sarea_priv)
 576                                 master_priv->sarea_priv->last_dispatch =
 577                                         READ_BREADCRUMB(dev_priv);
 578                 }
 579
 580                 if (iir & I915_USER_INTERRUPT) {
 581                         dev_priv->mm.irq_gem_seqno = i915_get_gem_seqno(dev);
 582                         DRM_WAKEUP(&dev_priv->irq_queue);
 583                 }
 584
 585                 if (pipea_stats & vblank_status) {
 586                         vblank++;
 587                         drm_handle_vblank(dev, 0);
 588                 }
 589
 590                 if (pipeb_stats & vblank_status) {
 591                         vblank++;
 592                         drm_handle_vblank(dev, 1);
 593                 }
 594
 595                 if ((pipeb_stats & I915_LEGACY_BLC_EVENT_STATUS) ||
 596                     (iir & I915_ASLE_INTERRUPT))
 597                         opregion_asle_intr(dev);
 598
 599                 /* With MSI, interrupts are only generated when iir
 600                  * transitions from zero to nonzero.  If another bit got
 601                  * set while we were handling the existing iir bits, then
 602                  * we would never get another interrupt.
 603                  *
 604                  * This is fine on non-MSI as well, as if we hit this path
 605                  * we avoid exiting the interrupt handler only to generate
 606                  * another one.
 607                  *
 608                  * Note that for MSI this could cause a stray interrupt report
 609                  * if an interrupt landed in the time between writing IIR and
 610                  * the posting read.  This should be rare enough to never
 611                  * trigger the 99% of 100,000 interrupts test for disabling
 612                  * stray interrupts.
 613                  */
 614                 iir = new_iir;
 615         }
 616
 617         return ret;
 618 }
 619
 620 static int i915_emit_irq(struct drm_device * dev)
 621 {
 622         drm_i915_private_t *dev_priv = dev->dev_private;
 623         struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
 624         RING_LOCALS;
 625
 626         i915_kernel_lost_context(dev);
 627
 628         DRM_DEBUG("\n");
 629
 630         dev_priv->counter++;
 631         if (dev_priv->counter > 0x7FFFFFFFUL)
 632                 dev_priv->counter = 1;
 633         if (master_priv->sarea_priv)
 634                 master_priv->sarea_priv->last_enqueue = dev_priv->counter;
 635
 636         BEGIN_LP_RING(4);
 637         OUT_RING(MI_STORE_DWORD_INDEX);
 638         OUT_RING(I915_BREADCRUMB_INDEX << MI_STORE_DWORD_INDEX_SHIFT);
 639         OUT_RING(dev_priv->counter);
 640         OUT_RING(MI_USER_INTERRUPT);
 641         ADVANCE_LP_RING();
 642
 643         return dev_priv->counter;
 644 }
 645
 646 void i915_user_irq_get(struct drm_device *dev)
 647 {
 648         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 649         unsigned long irqflags;
 650
 651         spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 652         if (dev->irq_enabled && (++dev_priv->user_irq_refcount == 1)) {
 653                 if (IS_IGDNG(dev))
 654                         igdng_enable_graphics_irq(dev_priv, GT_USER_INTERRUPT);
 655                 else
 656                         i915_enable_irq(dev_priv, I915_USER_INTERRUPT);
 657         }
 658         spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 659 }
 660
 661 void i915_user_irq_put(struct drm_device *dev)
 662 {
 663         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 664         unsigned long irqflags;
 665
 666         spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 667         BUG_ON(dev->irq_enabled && dev_priv->user_irq_refcount <= 0);
 668         if (dev->irq_enabled && (--dev_priv->user_irq_refcount == 0)) {
 669                 if (IS_IGDNG(dev))
 670                         igdng_disable_graphics_irq(dev_priv, GT_USER_INTERRUPT);
 671                 else
 672                         i915_disable_irq(dev_priv, I915_USER_INTERRUPT);
 673         }
 674         spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 675 }
 676
 677 static int i915_wait_irq(struct drm_device * dev, int irq_nr)
 678 {
 679         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 680         struct drm_i915_master_private *master_priv = dev->primary->master->driver_priv;
 681         int ret = 0;
 682
 683         DRM_DEBUG("irq_nr=%d breadcrumb=%d\n", irq_nr,
 684                   READ_BREADCRUMB(dev_priv));
 685
 686         if (READ_BREADCRUMB(dev_priv) >= irq_nr) {
 687                 if (master_priv->sarea_priv)
 688                         master_priv->sarea_priv->last_dispatch = READ_BREADCRUMB(dev_priv);
 689                 return 0;
 690         }
 691
 692         if (master_priv->sarea_priv)
 693                 master_priv->sarea_priv->perf_boxes |= I915_BOX_WAIT;
 694
 695         i915_user_irq_get(dev);
 696         DRM_WAIT_ON(ret, dev_priv->irq_queue, 3 * DRM_HZ,
 697                     READ_BREADCRUMB(dev_priv) >= irq_nr);
 698         i915_user_irq_put(dev);
 699
 700         if (ret == -EBUSY) {
 701                 DRM_ERROR("EBUSY -- rec: %d emitted: %d\n",
 702                           READ_BREADCRUMB(dev_priv), (int)dev_priv->counter);
 703         }
 704
 705         return ret;
 706 }
 707
 708 /* Needs the lock as it touches the ring.
 709  */
 710 int i915_irq_emit(struct drm_device *dev, void *data,
 711                          struct drm_file *file_priv)
 712 {
 713         drm_i915_private_t *dev_priv = dev->dev_private;
 714         drm_i915_irq_emit_t *emit = data;
 715         int result;
 716
 717         if (!dev_priv || !dev_priv->ring.virtual_start) {
 718                 DRM_ERROR("called with no initialization\n");
 719                 return -EINVAL;
 720         }
 721
 722         RING_LOCK_TEST_WITH_RETURN(dev, file_priv);
 723
 724         mutex_lock(&dev->struct_mutex);
 725         result = i915_emit_irq(dev);
 726         mutex_unlock(&dev->struct_mutex);
 727
 728         if (DRM_COPY_TO_USER(emit->irq_seq, &result, sizeof(int))) {
 729                 DRM_ERROR("copy_to_user\n");
 730                 return -EFAULT;
 731         }
 732
 733         return 0;
 734 }
 735
 736 /* Doesn't need the hardware lock.
 737  */
 738 int i915_irq_wait(struct drm_device *dev, void *data,
 739                          struct drm_file *file_priv)
 740 {
 741         drm_i915_private_t *dev_priv = dev->dev_private;
 742         drm_i915_irq_wait_t *irqwait = data;
 743
 744         if (!dev_priv) {
 745                 DRM_ERROR("called with no initialization\n");
 746                 return -EINVAL;
 747         }
 748
 749         return i915_wait_irq(dev, irqwait->irq_seq);
 750 }
 751
 752 /* Called from drm generic code, passed 'crtc' which
 753  * we use as a pipe index
 754  */
 755 int i915_enable_vblank(struct drm_device *dev, int pipe)
 756 {
 757         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 758         unsigned long irqflags;
 759         int pipeconf_reg = (pipe == 0) ? PIPEACONF : PIPEBCONF;
 760         u32 pipeconf;
 761
 762         pipeconf = I915_READ(pipeconf_reg);
 763         if (!(pipeconf & PIPEACONF_ENABLE))
 764                 return -EINVAL;
 765
 766         if (IS_IGDNG(dev))
 767                 return 0;
 768
 769         spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 770         if (IS_I965G(dev))
 771                 i915_enable_pipestat(dev_priv, pipe,
 772                                      PIPE_START_VBLANK_INTERRUPT_ENABLE);
 773         else
 774                 i915_enable_pipestat(dev_priv, pipe,
 775                                      PIPE_VBLANK_INTERRUPT_ENABLE);
 776         spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 777         return 0;
 778 }
 779
 780 /* Called from drm generic code, passed 'crtc' which
 781  * we use as a pipe index
 782  */
 783 void i915_disable_vblank(struct drm_device *dev, int pipe)
 784 {
 785         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 786         unsigned long irqflags;
 787
 788         if (IS_IGDNG(dev))
 789                 return;
 790
 791         spin_lock_irqsave(&dev_priv->user_irq_lock, irqflags);
 792         i915_disable_pipestat(dev_priv, pipe,
 793                               PIPE_VBLANK_INTERRUPT_ENABLE |
 794                               PIPE_START_VBLANK_INTERRUPT_ENABLE);
 795         spin_unlock_irqrestore(&dev_priv->user_irq_lock, irqflags);
 796 }
 797
 798 void i915_enable_interrupt (struct drm_device *dev)
 799 {
 800         struct drm_i915_private *dev_priv = dev->dev_private;
 801
 802         if (!IS_IGDNG(dev))
 803                 opregion_enable_asle(dev);
 804         dev_priv->irq_enabled = 1;
 805 }
 806
 807
 808 /* Set the vblank monitor pipe
 809  */
 810 int i915_vblank_pipe_set(struct drm_device *dev, void *data,
 811                          struct drm_file *file_priv)
 812 {
 813         drm_i915_private_t *dev_priv = dev->dev_private;
 814
 815         if (!dev_priv) {
 816                 DRM_ERROR("called with no initialization\n");
 817                 return -EINVAL;
 818         }
 819
 820         return 0;
 821 }
 822
 823 int i915_vblank_pipe_get(struct drm_device *dev, void *data,
 824                          struct drm_file *file_priv)
 825 {
 826         drm_i915_private_t *dev_priv = dev->dev_private;
 827         drm_i915_vblank_pipe_t *pipe = data;
 828
 829         if (!dev_priv) {
 830                 DRM_ERROR("called with no initialization\n");
 831                 return -EINVAL;
 832         }
 833
 834         pipe->pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
 835
 836         return 0;
 837 }
 838
 839 /**
 840  * Schedule buffer swap at given vertical blank.
 841  */
 842 int i915_vblank_swap(struct drm_device *dev, void *data,
 843                      struct drm_file *file_priv)
 844 {
 845         /* The delayed swap mechanism was fundamentally racy, and has been
 846          * removed.  The model was that the client requested a delayed flip/swap
 847          * from the kernel, then waited for vblank before continuing to perform
 848          * rendering.  The problem was that the kernel might wake the client
 849          * up before it dispatched the vblank swap (since the lock has to be
 850          * held while touching the ringbuffer), in which case the client would
 851          * clear and start the next frame before the swap occurred, and
 852          * flicker would occur in addition to likely missing the vblank.
 853          *
 854          * In the absence of this ioctl, userland falls back to a correct path
 855          * of waiting for a vblank, then dispatching the swap on its own.
 856          * Context switching to userland and back is plenty fast enough for
 857          * meeting the requirements of vblank swapping.
 858          */
 859         return -EINVAL;
 860 }
 861
 862 /* drm_dma.h hooks
 863 */
 864 static void igdng_irq_preinstall(struct drm_device *dev)
 865 {
 866         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 867
 868         I915_WRITE(HWSTAM, 0xeffe);
 869
 870         /* XXX hotplug from PCH */
 871
 872         I915_WRITE(DEIMR, 0xffffffff);
 873         I915_WRITE(DEIER, 0x0);
 874         (void) I915_READ(DEIER);
 875
 876         /* and GT */
 877         I915_WRITE(GTIMR, 0xffffffff);
 878         I915_WRITE(GTIER, 0x0);
 879         (void) I915_READ(GTIER);
 880 }
 881
 882 static int igdng_irq_postinstall(struct drm_device *dev)
 883 {
 884         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 885         /* enable kind of interrupts always enabled */
 886         u32 display_mask = DE_MASTER_IRQ_CONTROL /*| DE_PCH_EVENT */;
 887         u32 render_mask = GT_USER_INTERRUPT;
 888
 889         dev_priv->irq_mask_reg = ~display_mask;
 890         dev_priv->de_irq_enable_reg = display_mask;
 891
 892         /* should always can generate irq */
 893         I915_WRITE(DEIIR, I915_READ(DEIIR));
 894         I915_WRITE(DEIMR, dev_priv->irq_mask_reg);
 895         I915_WRITE(DEIER, dev_priv->de_irq_enable_reg);
 896         (void) I915_READ(DEIER);
 897
 898         /* user interrupt should be enabled, but masked initial */
 899         dev_priv->gt_irq_mask_reg = 0xffffffff;
 900         dev_priv->gt_irq_enable_reg = render_mask;
 901
 902         I915_WRITE(GTIIR, I915_READ(GTIIR));
 903         I915_WRITE(GTIMR, dev_priv->gt_irq_mask_reg);
 904         I915_WRITE(GTIER, dev_priv->gt_irq_enable_reg);
 905         (void) I915_READ(GTIER);
 906
 907         return 0;
 908 }
 909
 910 void i915_driver_irq_preinstall(struct drm_device * dev)
 911 {
 912         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 913
 914         atomic_set(&dev_priv->irq_received, 0);
 915
 916         INIT_WORK(&dev_priv->hotplug_work, i915_hotplug_work_func);
 917         INIT_WORK(&dev_priv->error_work, i915_error_work_func);
 918
 919         if (IS_IGDNG(dev)) {
 920                 igdng_irq_preinstall(dev);
 921                 return;
 922         }
 923
 924         if (I915_HAS_HOTPLUG(dev)) {
 925                 I915_WRITE(PORT_HOTPLUG_EN, 0);
 926                 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
 927         }
 928
 929         I915_WRITE(HWSTAM, 0xeffe);
 930         I915_WRITE(PIPEASTAT, 0);
 931         I915_WRITE(PIPEBSTAT, 0);
 932         I915_WRITE(IMR, 0xffffffff);
 933         I915_WRITE(IER, 0x0);
 934         (void) I915_READ(IER);
 935 }
 936
 937 int i915_driver_irq_postinstall(struct drm_device *dev)
 938 {
 939         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
 940         u32 enable_mask = I915_INTERRUPT_ENABLE_FIX | I915_INTERRUPT_ENABLE_VAR;
 941         u32 error_mask;
 942
 943         DRM_INIT_WAITQUEUE(&dev_priv->irq_queue);
 944
 945         dev_priv->vblank_pipe = DRM_I915_VBLANK_PIPE_A | DRM_I915_VBLANK_PIPE_B;
 946
 947         if (IS_IGDNG(dev))
 948                 return igdng_irq_postinstall(dev);
 949
 950         /* Unmask the interrupts that we always want on. */
 951         dev_priv->irq_mask_reg = ~I915_INTERRUPT_ENABLE_FIX;
 952
 953         dev_priv->pipestat[0] = 0;
 954         dev_priv->pipestat[1] = 0;
 955
 956         if (I915_HAS_HOTPLUG(dev)) {
 957                 u32 hotplug_en = I915_READ(PORT_HOTPLUG_EN);
 958
 959                 /* Leave other bits alone */
 960                 hotplug_en |= HOTPLUG_EN_MASK;
 961                 I915_WRITE(PORT_HOTPLUG_EN, hotplug_en);
 962
 963                 dev_priv->hotplug_supported_mask = CRT_HOTPLUG_INT_STATUS |
 964                         TV_HOTPLUG_INT_STATUS | SDVOC_HOTPLUG_INT_STATUS |
 965                         SDVOB_HOTPLUG_INT_STATUS;
 966                 if (IS_G4X(dev)) {
 967                         dev_priv->hotplug_supported_mask |=
 968                                 HDMIB_HOTPLUG_INT_STATUS |
 969                                 HDMIC_HOTPLUG_INT_STATUS |
 970                                 HDMID_HOTPLUG_INT_STATUS;
 971                 }
 972                 /* Enable in IER... */
 973                 enable_mask |= I915_DISPLAY_PORT_INTERRUPT;
 974                 /* and unmask in IMR */
 975                 i915_enable_irq(dev_priv, I915_DISPLAY_PORT_INTERRUPT);
 976         }
 977
 978         /*
 979          * Enable some error detection, note the instruction error mask
 980          * bit is reserved, so we leave it masked.
 981          */
 982         if (IS_G4X(dev)) {
 983                 error_mask = ~(GM45_ERROR_PAGE_TABLE |
 984                                GM45_ERROR_MEM_PRIV |
 985                                GM45_ERROR_CP_PRIV |
 986                                I915_ERROR_MEMORY_REFRESH);
 987         } else {
 988                 error_mask = ~(I915_ERROR_PAGE_TABLE |
 989                                I915_ERROR_MEMORY_REFRESH);
 990         }
 991         I915_WRITE(EMR, error_mask);
 992
 993         /* Disable pipe interrupt enables, clear pending pipe status */
 994         I915_WRITE(PIPEASTAT, I915_READ(PIPEASTAT) & 0x8000ffff);
 995         I915_WRITE(PIPEBSTAT, I915_READ(PIPEBSTAT) & 0x8000ffff);
 996         /* Clear pending interrupt status */
 997         I915_WRITE(IIR, I915_READ(IIR));
 998
 999         I915_WRITE(IER, enable_mask);
1000         I915_WRITE(IMR, dev_priv->irq_mask_reg);
1001         (void) I915_READ(IER);
1002
1003         opregion_enable_asle(dev);
1004
1005         return 0;
1006 }
1007
1008 static void igdng_irq_uninstall(struct drm_device *dev)
1009 {
1010         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1011         I915_WRITE(HWSTAM, 0xffffffff);
1012
1013         I915_WRITE(DEIMR, 0xffffffff);
1014         I915_WRITE(DEIER, 0x0);
1015         I915_WRITE(DEIIR, I915_READ(DEIIR));
1016
1017         I915_WRITE(GTIMR, 0xffffffff);
1018         I915_WRITE(GTIER, 0x0);
1019         I915_WRITE(GTIIR, I915_READ(GTIIR));
1020 }
1021
1022 void i915_driver_irq_uninstall(struct drm_device * dev)
1023 {
1024         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
1025
1026         if (!dev_priv)
1027                 return;
1028
1029         dev_priv->vblank_pipe = 0;
1030
1031         if (IS_IGDNG(dev)) {
1032                 igdng_irq_uninstall(dev);
1033                 return;
1034         }
1035
1036         if (I915_HAS_HOTPLUG(dev)) {
1037                 I915_WRITE(PORT_HOTPLUG_EN, 0);
1038                 I915_WRITE(PORT_HOTPLUG_STAT, I915_READ(PORT_HOTPLUG_STAT));
1039         }
1040
1041         I915_WRITE(HWSTAM, 0xffffffff);
1042         I915_WRITE(PIPEASTAT, 0);
1043         I915_WRITE(PIPEBSTAT, 0);
1044         I915_WRITE(IMR, 0xffffffff);
1045         I915_WRITE(IER, 0x0);
1046
1047         I915_WRITE(PIPEASTAT, I915_READ(PIPEASTAT) & 0x8000ffff);
1048         I915_WRITE(PIPEBSTAT, I915_READ(PIPEBSTAT) & 0x8000ffff);
1049         I915_WRITE(IIR, I915_READ(IIR));
1050 }