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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  30
  31 #include <linux/slab.h>
  32 #include <linux/sysrq.h>
  33
  34 #include <drm/drm_drv.h>
  35
  36 #include "display/intel_display_irq.h"
  37 #include "display/intel_display_types.h"
  38 #include "display/intel_hotplug.h"
  39 #include "display/intel_hotplug_irq.h"
  40 #include "display/intel_lpe_audio.h"
  41 #include "display/intel_psr_regs.h"
  42
  43 #include "gt/intel_breadcrumbs.h"
  44 #include "gt/intel_gt.h"
  45 #include "gt/intel_gt_irq.h"
  46 #include "gt/intel_gt_pm_irq.h"
  47 #include "gt/intel_gt_regs.h"
  48 #include "gt/intel_rps.h"
  49
  50 #include "i915_driver.h"
  51 #include "i915_drv.h"
  52 #include "i915_irq.h"
  53 #include "i915_reg.h"
  54
  55 /**
  56  * DOC: interrupt handling
  57  *
  58  * These functions provide the basic support for enabling and disabling the
  59  * interrupt handling support. There's a lot more functionality in i915_irq.c
  60  * and related files, but that will be described in separate chapters.
  61  */
  62
  63 /*
  64  * Interrupt statistic for PMU. Increments the counter only if the
  65  * interrupt originated from the GPU so interrupts from a device which
  66  * shares the interrupt line are not accounted.
  67  */
  68 static inline void pmu_irq_stats(struct drm_i915_private *i915,
  69                                  irqreturn_t res)
  70 {
  71         if (unlikely(res != IRQ_HANDLED))
  72                 return;
  73
  74         /*
  75          * A clever compiler translates that into INC. A not so clever one
  76          * should at least prevent store tearing.
  77          */
  78         WRITE_ONCE(i915->pmu.irq_count, i915->pmu.irq_count + 1);
  79 }
  80
  81 void gen3_irq_reset(struct intel_uncore *uncore, i915_reg_t imr,
  82                     i915_reg_t iir, i915_reg_t ier)
  83 {
  84         intel_uncore_write(uncore, imr, 0xffffffff);
  85         intel_uncore_posting_read(uncore, imr);
  86
  87         intel_uncore_write(uncore, ier, 0);
  88
  89         /* IIR can theoretically queue up two events. Be paranoid. */
  90         intel_uncore_write(uncore, iir, 0xffffffff);
  91         intel_uncore_posting_read(uncore, iir);
  92         intel_uncore_write(uncore, iir, 0xffffffff);
  93         intel_uncore_posting_read(uncore, iir);
  94 }
  95
  96 static void gen2_irq_reset(struct intel_uncore *uncore)
  97 {
  98         intel_uncore_write16(uncore, GEN2_IMR, 0xffff);
  99         intel_uncore_posting_read16(uncore, GEN2_IMR);
 100
 101         intel_uncore_write16(uncore, GEN2_IER, 0);
 102
 103         /* IIR can theoretically queue up two events. Be paranoid. */
 104         intel_uncore_write16(uncore, GEN2_IIR, 0xffff);
 105         intel_uncore_posting_read16(uncore, GEN2_IIR);
 106         intel_uncore_write16(uncore, GEN2_IIR, 0xffff);
 107         intel_uncore_posting_read16(uncore, GEN2_IIR);
 108 }
 109
 110 /*
 111  * We should clear IMR at preinstall/uninstall, and just check at postinstall.
 112  */
 113 void gen3_assert_iir_is_zero(struct intel_uncore *uncore, i915_reg_t reg)
 114 {
 115         u32 val = intel_uncore_read(uncore, reg);
 116
 117         if (val == 0)
 118                 return;
 119
 120         drm_WARN(&uncore->i915->drm, 1,
 121                  "Interrupt register 0x%x is not zero: 0x%08x\n",
 122                  i915_mmio_reg_offset(reg), val);
 123         intel_uncore_write(uncore, reg, 0xffffffff);
 124         intel_uncore_posting_read(uncore, reg);
 125         intel_uncore_write(uncore, reg, 0xffffffff);
 126         intel_uncore_posting_read(uncore, reg);
 127 }
 128
 129 static void gen2_assert_iir_is_zero(struct intel_uncore *uncore)
 130 {
 131         u16 val = intel_uncore_read16(uncore, GEN2_IIR);
 132
 133         if (val == 0)
 134                 return;
 135
 136         drm_WARN(&uncore->i915->drm, 1,
 137                  "Interrupt register 0x%x is not zero: 0x%08x\n",
 138                  i915_mmio_reg_offset(GEN2_IIR), val);
 139         intel_uncore_write16(uncore, GEN2_IIR, 0xffff);
 140         intel_uncore_posting_read16(uncore, GEN2_IIR);
 141         intel_uncore_write16(uncore, GEN2_IIR, 0xffff);
 142         intel_uncore_posting_read16(uncore, GEN2_IIR);
 143 }
 144
 145 void gen3_irq_init(struct intel_uncore *uncore,
 146                    i915_reg_t imr, u32 imr_val,
 147                    i915_reg_t ier, u32 ier_val,
 148                    i915_reg_t iir)
 149 {
 150         gen3_assert_iir_is_zero(uncore, iir);
 151
 152         intel_uncore_write(uncore, ier, ier_val);
 153         intel_uncore_write(uncore, imr, imr_val);
 154         intel_uncore_posting_read(uncore, imr);
 155 }
 156
 157 static void gen2_irq_init(struct intel_uncore *uncore,
 158                           u32 imr_val, u32 ier_val)
 159 {
 160         gen2_assert_iir_is_zero(uncore);
 161
 162         intel_uncore_write16(uncore, GEN2_IER, ier_val);
 163         intel_uncore_write16(uncore, GEN2_IMR, imr_val);
 164         intel_uncore_posting_read16(uncore, GEN2_IMR);
 165 }
 166
 167 /**
 168  * ivb_parity_work - Workqueue called when a parity error interrupt
 169  * occurred.
 170  * @work: workqueue struct
 171  *
 172  * Doesn't actually do anything except notify userspace. As a consequence of
 173  * this event, userspace should try to remap the bad rows since statistically
 174  * it is likely the same row is more likely to go bad again.
 175  */
 176 static void ivb_parity_work(struct work_struct *work)
 177 {
 178         struct drm_i915_private *dev_priv =
 179                 container_of(work, typeof(*dev_priv), l3_parity.error_work);
 180         struct intel_gt *gt = to_gt(dev_priv);
 181         u32 error_status, row, bank, subbank;
 182         char *parity_event[6];
 183         u32 misccpctl;
 184         u8 slice = 0;
 185
 186         /* We must turn off DOP level clock gating to access the L3 registers.
 187          * In order to prevent a get/put style interface, acquire struct mutex
 188          * any time we access those registers.
 189          */
 190         mutex_lock(&dev_priv->drm.struct_mutex);
 191
 192         /* If we've screwed up tracking, just let the interrupt fire again */
 193         if (drm_WARN_ON(&dev_priv->drm, !dev_priv->l3_parity.which_slice))
 194                 goto out;
 195
 196         misccpctl = intel_uncore_rmw(&dev_priv->uncore, GEN7_MISCCPCTL,
 197                                      GEN7_DOP_CLOCK_GATE_ENABLE, 0);
 198         intel_uncore_posting_read(&dev_priv->uncore, GEN7_MISCCPCTL);
 199
 200         while ((slice = ffs(dev_priv->l3_parity.which_slice)) != 0) {
 201                 i915_reg_t reg;
 202
 203                 slice--;
 204                 if (drm_WARN_ON_ONCE(&dev_priv->drm,
 205                                      slice >= NUM_L3_SLICES(dev_priv)))
 206                         break;
 207
 208                 dev_priv->l3_parity.which_slice &= ~(1<<slice);
 209
 210                 reg = GEN7_L3CDERRST1(slice);
 211
 212                 error_status = intel_uncore_read(&dev_priv->uncore, reg);
 213                 row = GEN7_PARITY_ERROR_ROW(error_status);
 214                 bank = GEN7_PARITY_ERROR_BANK(error_status);
 215                 subbank = GEN7_PARITY_ERROR_SUBBANK(error_status);
 216
 217                 intel_uncore_write(&dev_priv->uncore, reg, GEN7_PARITY_ERROR_VALID | GEN7_L3CDERRST1_ENABLE);
 218                 intel_uncore_posting_read(&dev_priv->uncore, reg);
 219
 220                 parity_event[0] = I915_L3_PARITY_UEVENT "=1";
 221                 parity_event[1] = kasprintf(GFP_KERNEL, "ROW=%d", row);
 222                 parity_event[2] = kasprintf(GFP_KERNEL, "BANK=%d", bank);
 223                 parity_event[3] = kasprintf(GFP_KERNEL, "SUBBANK=%d", subbank);
 224                 parity_event[4] = kasprintf(GFP_KERNEL, "SLICE=%d", slice);
 225                 parity_event[5] = NULL;
 226
 227                 kobject_uevent_env(&dev_priv->drm.primary->kdev->kobj,
 228                                    KOBJ_CHANGE, parity_event);
 229
 230                 drm_dbg(&dev_priv->drm,
 231                         "Parity error: Slice = %d, Row = %d, Bank = %d, Sub bank = %d.\n",
 232                         slice, row, bank, subbank);
 233
 234                 kfree(parity_event[4]);
 235                 kfree(parity_event[3]);
 236                 kfree(parity_event[2]);
 237                 kfree(parity_event[1]);
 238         }
 239
 240         intel_uncore_write(&dev_priv->uncore, GEN7_MISCCPCTL, misccpctl);
 241
 242 out:
 243         drm_WARN_ON(&dev_priv->drm, dev_priv->l3_parity.which_slice);
 244         spin_lock_irq(gt->irq_lock);
 245         gen5_gt_enable_irq(gt, GT_PARITY_ERROR(dev_priv));
 246         spin_unlock_irq(gt->irq_lock);
 247
 248         mutex_unlock(&dev_priv->drm.struct_mutex);
 249 }
 250
 251 static irqreturn_t valleyview_irq_handler(int irq, void *arg)
 252 {
 253         struct drm_i915_private *dev_priv = arg;
 254         irqreturn_t ret = IRQ_NONE;
 255
 256         if (!intel_irqs_enabled(dev_priv))
 257                 return IRQ_NONE;
 258
 259         /* IRQs are synced during runtime_suspend, we don't require a wakeref */
 260         disable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
 261
 262         do {
 263                 u32 iir, gt_iir, pm_iir;
 264                 u32 pipe_stats[I915_MAX_PIPES] = {};
 265                 u32 hotplug_status = 0;
 266                 u32 ier = 0;
 267
 268                 gt_iir = intel_uncore_read(&dev_priv->uncore, GTIIR);
 269                 pm_iir = intel_uncore_read(&dev_priv->uncore, GEN6_PMIIR);
 270                 iir = intel_uncore_read(&dev_priv->uncore, VLV_IIR);
 271
 272                 if (gt_iir == 0 && pm_iir == 0 && iir == 0)
 273                         break;
 274
 275                 ret = IRQ_HANDLED;
 276
 277                 /*
 278                  * Theory on interrupt generation, based on empirical evidence:
 279                  *
 280                  * x = ((VLV_IIR & VLV_IER) ||
 281                  *      (((GT_IIR & GT_IER) || (GEN6_PMIIR & GEN6_PMIER)) &&
 282                  *       (VLV_MASTER_IER & MASTER_INTERRUPT_ENABLE)));
 283                  *
 284                  * A CPU interrupt will only be raised when 'x' has a 0->1 edge.
 285                  * Hence we clear MASTER_INTERRUPT_ENABLE and VLV_IER to
 286                  * guarantee the CPU interrupt will be raised again even if we
 287                  * don't end up clearing all the VLV_IIR, GT_IIR, GEN6_PMIIR
 288                  * bits this time around.
 289                  */
 290                 intel_uncore_write(&dev_priv->uncore, VLV_MASTER_IER, 0);
 291                 ier = intel_uncore_rmw(&dev_priv->uncore, VLV_IER, ~0, 0);
 292
 293                 if (gt_iir)
 294                         intel_uncore_write(&dev_priv->uncore, GTIIR, gt_iir);
 295                 if (pm_iir)
 296                         intel_uncore_write(&dev_priv->uncore, GEN6_PMIIR, pm_iir);
 297
 298                 if (iir & I915_DISPLAY_PORT_INTERRUPT)
 299                         hotplug_status = i9xx_hpd_irq_ack(dev_priv);
 300
 301                 /* Call regardless, as some status bits might not be
 302                  * signalled in iir */
 303                 i9xx_pipestat_irq_ack(dev_priv, iir, pipe_stats);
 304
 305                 if (iir & (I915_LPE_PIPE_A_INTERRUPT |
 306                            I915_LPE_PIPE_B_INTERRUPT))
 307                         intel_lpe_audio_irq_handler(dev_priv);
 308
 309                 /*
 310                  * VLV_IIR is single buffered, and reflects the level
 311                  * from PIPESTAT/PORT_HOTPLUG_STAT, hence clear it last.
 312                  */
 313                 if (iir)
 314                         intel_uncore_write(&dev_priv->uncore, VLV_IIR, iir);
 315
 316                 intel_uncore_write(&dev_priv->uncore, VLV_IER, ier);
 317                 intel_uncore_write(&dev_priv->uncore, VLV_MASTER_IER, MASTER_INTERRUPT_ENABLE);
 318
 319                 if (gt_iir)
 320                         gen6_gt_irq_handler(to_gt(dev_priv), gt_iir);
 321                 if (pm_iir)
 322                         gen6_rps_irq_handler(&to_gt(dev_priv)->rps, pm_iir);
 323
 324                 if (hotplug_status)
 325                         i9xx_hpd_irq_handler(dev_priv, hotplug_status);
 326
 327                 valleyview_pipestat_irq_handler(dev_priv, pipe_stats);
 328         } while (0);
 329
 330         pmu_irq_stats(dev_priv, ret);
 331
 332         enable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
 333
 334         return ret;
 335 }
 336
 337 static irqreturn_t cherryview_irq_handler(int irq, void *arg)
 338 {
 339         struct drm_i915_private *dev_priv = arg;
 340         irqreturn_t ret = IRQ_NONE;
 341
 342         if (!intel_irqs_enabled(dev_priv))
 343                 return IRQ_NONE;
 344
 345         /* IRQs are synced during runtime_suspend, we don't require a wakeref */
 346         disable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
 347
 348         do {
 349                 u32 master_ctl, iir;
 350                 u32 pipe_stats[I915_MAX_PIPES] = {};
 351                 u32 hotplug_status = 0;
 352                 u32 ier = 0;
 353
 354                 master_ctl = intel_uncore_read(&dev_priv->uncore, GEN8_MASTER_IRQ) & ~GEN8_MASTER_IRQ_CONTROL;
 355                 iir = intel_uncore_read(&dev_priv->uncore, VLV_IIR);
 356
 357                 if (master_ctl == 0 && iir == 0)
 358                         break;
 359
 360                 ret = IRQ_HANDLED;
 361
 362                 /*
 363                  * Theory on interrupt generation, based on empirical evidence:
 364                  *
 365                  * x = ((VLV_IIR & VLV_IER) ||
 366                  *      ((GEN8_MASTER_IRQ & ~GEN8_MASTER_IRQ_CONTROL) &&
 367                  *       (GEN8_MASTER_IRQ & GEN8_MASTER_IRQ_CONTROL)));
 368                  *
 369                  * A CPU interrupt will only be raised when 'x' has a 0->1 edge.
 370                  * Hence we clear GEN8_MASTER_IRQ_CONTROL and VLV_IER to
 371                  * guarantee the CPU interrupt will be raised again even if we
 372                  * don't end up clearing all the VLV_IIR and GEN8_MASTER_IRQ_CONTROL
 373                  * bits this time around.
 374                  */
 375                 intel_uncore_write(&dev_priv->uncore, GEN8_MASTER_IRQ, 0);
 376                 ier = intel_uncore_rmw(&dev_priv->uncore, VLV_IER, ~0, 0);
 377
 378                 gen8_gt_irq_handler(to_gt(dev_priv), master_ctl);
 379
 380                 if (iir & I915_DISPLAY_PORT_INTERRUPT)
 381                         hotplug_status = i9xx_hpd_irq_ack(dev_priv);
 382
 383                 /* Call regardless, as some status bits might not be
 384                  * signalled in iir */
 385                 i9xx_pipestat_irq_ack(dev_priv, iir, pipe_stats);
 386
 387                 if (iir & (I915_LPE_PIPE_A_INTERRUPT |
 388                            I915_LPE_PIPE_B_INTERRUPT |
 389                            I915_LPE_PIPE_C_INTERRUPT))
 390                         intel_lpe_audio_irq_handler(dev_priv);
 391
 392                 /*
 393                  * VLV_IIR is single buffered, and reflects the level
 394                  * from PIPESTAT/PORT_HOTPLUG_STAT, hence clear it last.
 395                  */
 396                 if (iir)
 397                         intel_uncore_write(&dev_priv->uncore, VLV_IIR, iir);
 398
 399                 intel_uncore_write(&dev_priv->uncore, VLV_IER, ier);
 400                 intel_uncore_write(&dev_priv->uncore, GEN8_MASTER_IRQ, GEN8_MASTER_IRQ_CONTROL);
 401
 402                 if (hotplug_status)
 403                         i9xx_hpd_irq_handler(dev_priv, hotplug_status);
 404
 405                 valleyview_pipestat_irq_handler(dev_priv, pipe_stats);
 406         } while (0);
 407
 408         pmu_irq_stats(dev_priv, ret);
 409
 410         enable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
 411
 412         return ret;
 413 }
 414
 415 /*
 416  * To handle irqs with the minimum potential races with fresh interrupts, we:
 417  * 1 - Disable Master Interrupt Control.
 418  * 2 - Find the source(s) of the interrupt.
 419  * 3 - Clear the Interrupt Identity bits (IIR).
 420  * 4 - Process the interrupt(s) that had bits set in the IIRs.
 421  * 5 - Re-enable Master Interrupt Control.
 422  */
 423 static irqreturn_t ilk_irq_handler(int irq, void *arg)
 424 {
 425         struct drm_i915_private *i915 = arg;
 426         void __iomem * const regs = intel_uncore_regs(&i915->uncore);
 427         u32 de_iir, gt_iir, de_ier, sde_ier = 0;
 428         irqreturn_t ret = IRQ_NONE;
 429
 430         if (unlikely(!intel_irqs_enabled(i915)))
 431                 return IRQ_NONE;
 432
 433         /* IRQs are synced during runtime_suspend, we don't require a wakeref */
 434         disable_rpm_wakeref_asserts(&i915->runtime_pm);
 435
 436         /* disable master interrupt before clearing iir  */
 437         de_ier = raw_reg_read(regs, DEIER);
 438         raw_reg_write(regs, DEIER, de_ier & ~DE_MASTER_IRQ_CONTROL);
 439
 440         /* Disable south interrupts. We'll only write to SDEIIR once, so further
 441          * interrupts will will be stored on its back queue, and then we'll be
 442          * able to process them after we restore SDEIER (as soon as we restore
 443          * it, we'll get an interrupt if SDEIIR still has something to process
 444          * due to its back queue). */
 445         if (!HAS_PCH_NOP(i915)) {
 446                 sde_ier = raw_reg_read(regs, SDEIER);
 447                 raw_reg_write(regs, SDEIER, 0);
 448         }
 449
 450         /* Find, clear, then process each source of interrupt */
 451
 452         gt_iir = raw_reg_read(regs, GTIIR);
 453         if (gt_iir) {
 454                 raw_reg_write(regs, GTIIR, gt_iir);
 455                 if (GRAPHICS_VER(i915) >= 6)
 456                         gen6_gt_irq_handler(to_gt(i915), gt_iir);
 457                 else
 458                         gen5_gt_irq_handler(to_gt(i915), gt_iir);
 459                 ret = IRQ_HANDLED;
 460         }
 461
 462         de_iir = raw_reg_read(regs, DEIIR);
 463         if (de_iir) {
 464                 raw_reg_write(regs, DEIIR, de_iir);
 465                 if (DISPLAY_VER(i915) >= 7)
 466                         ivb_display_irq_handler(i915, de_iir);
 467                 else
 468                         ilk_display_irq_handler(i915, de_iir);
 469                 ret = IRQ_HANDLED;
 470         }
 471
 472         if (GRAPHICS_VER(i915) >= 6) {
 473                 u32 pm_iir = raw_reg_read(regs, GEN6_PMIIR);
 474                 if (pm_iir) {
 475                         raw_reg_write(regs, GEN6_PMIIR, pm_iir);
 476                         gen6_rps_irq_handler(&to_gt(i915)->rps, pm_iir);
 477                         ret = IRQ_HANDLED;
 478                 }
 479         }
 480
 481         raw_reg_write(regs, DEIER, de_ier);
 482         if (sde_ier)
 483                 raw_reg_write(regs, SDEIER, sde_ier);
 484
 485         pmu_irq_stats(i915, ret);
 486
 487         /* IRQs are synced during runtime_suspend, we don't require a wakeref */
 488         enable_rpm_wakeref_asserts(&i915->runtime_pm);
 489
 490         return ret;
 491 }
 492
 493 static inline u32 gen8_master_intr_disable(void __iomem * const regs)
 494 {
 495         raw_reg_write(regs, GEN8_MASTER_IRQ, 0);
 496
 497         /*
 498          * Now with master disabled, get a sample of level indications
 499          * for this interrupt. Indications will be cleared on related acks.
 500          * New indications can and will light up during processing,
 501          * and will generate new interrupt after enabling master.
 502          */
 503         return raw_reg_read(regs, GEN8_MASTER_IRQ);
 504 }
 505
 506 static inline void gen8_master_intr_enable(void __iomem * const regs)
 507 {
 508         raw_reg_write(regs, GEN8_MASTER_IRQ, GEN8_MASTER_IRQ_CONTROL);
 509 }
 510
 511 static irqreturn_t gen8_irq_handler(int irq, void *arg)
 512 {
 513         struct drm_i915_private *dev_priv = arg;
 514         void __iomem * const regs = intel_uncore_regs(&dev_priv->uncore);
 515         u32 master_ctl;
 516
 517         if (!intel_irqs_enabled(dev_priv))
 518                 return IRQ_NONE;
 519
 520         master_ctl = gen8_master_intr_disable(regs);
 521         if (!master_ctl) {
 522                 gen8_master_intr_enable(regs);
 523                 return IRQ_NONE;
 524         }
 525
 526         /* Find, queue (onto bottom-halves), then clear each source */
 527         gen8_gt_irq_handler(to_gt(dev_priv), master_ctl);
 528
 529         /* IRQs are synced during runtime_suspend, we don't require a wakeref */
 530         if (master_ctl & ~GEN8_GT_IRQS) {
 531                 disable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
 532                 gen8_de_irq_handler(dev_priv, master_ctl);
 533                 enable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
 534         }
 535
 536         gen8_master_intr_enable(regs);
 537
 538         pmu_irq_stats(dev_priv, IRQ_HANDLED);
 539
 540         return IRQ_HANDLED;
 541 }
 542
 543 static inline u32 gen11_master_intr_disable(void __iomem * const regs)
 544 {
 545         raw_reg_write(regs, GEN11_GFX_MSTR_IRQ, 0);
 546
 547         /*
 548          * Now with master disabled, get a sample of level indications
 549          * for this interrupt. Indications will be cleared on related acks.
 550          * New indications can and will light up during processing,
 551          * and will generate new interrupt after enabling master.
 552          */
 553         return raw_reg_read(regs, GEN11_GFX_MSTR_IRQ);
 554 }
 555
 556 static inline void gen11_master_intr_enable(void __iomem * const regs)
 557 {
 558         raw_reg_write(regs, GEN11_GFX_MSTR_IRQ, GEN11_MASTER_IRQ);
 559 }
 560
 561 static irqreturn_t gen11_irq_handler(int irq, void *arg)
 562 {
 563         struct drm_i915_private *i915 = arg;
 564         void __iomem * const regs = intel_uncore_regs(&i915->uncore);
 565         struct intel_gt *gt = to_gt(i915);
 566         u32 master_ctl;
 567         u32 gu_misc_iir;
 568
 569         if (!intel_irqs_enabled(i915))
 570                 return IRQ_NONE;
 571
 572         master_ctl = gen11_master_intr_disable(regs);
 573         if (!master_ctl) {
 574                 gen11_master_intr_enable(regs);
 575                 return IRQ_NONE;
 576         }
 577
 578         /* Find, queue (onto bottom-halves), then clear each source */
 579         gen11_gt_irq_handler(gt, master_ctl);
 580
 581         /* IRQs are synced during runtime_suspend, we don't require a wakeref */
 582         if (master_ctl & GEN11_DISPLAY_IRQ)
 583                 gen11_display_irq_handler(i915);
 584
 585         gu_misc_iir = gen11_gu_misc_irq_ack(i915, master_ctl);
 586
 587         gen11_master_intr_enable(regs);
 588
 589         gen11_gu_misc_irq_handler(i915, gu_misc_iir);
 590
 591         pmu_irq_stats(i915, IRQ_HANDLED);
 592
 593         return IRQ_HANDLED;
 594 }
 595
 596 static inline u32 dg1_master_intr_disable(void __iomem * const regs)
 597 {
 598         u32 val;
 599
 600         /* First disable interrupts */
 601         raw_reg_write(regs, DG1_MSTR_TILE_INTR, 0);
 602
 603         /* Get the indication levels and ack the master unit */
 604         val = raw_reg_read(regs, DG1_MSTR_TILE_INTR);
 605         if (unlikely(!val))
 606                 return 0;
 607
 608         raw_reg_write(regs, DG1_MSTR_TILE_INTR, val);
 609
 610         return val;
 611 }
 612
 613 static inline void dg1_master_intr_enable(void __iomem * const regs)
 614 {
 615         raw_reg_write(regs, DG1_MSTR_TILE_INTR, DG1_MSTR_IRQ);
 616 }
 617
 618 static irqreturn_t dg1_irq_handler(int irq, void *arg)
 619 {
 620         struct drm_i915_private * const i915 = arg;
 621         struct intel_gt *gt = to_gt(i915);
 622         void __iomem * const regs = intel_uncore_regs(gt->uncore);
 623         u32 master_tile_ctl, master_ctl;
 624         u32 gu_misc_iir;
 625
 626         if (!intel_irqs_enabled(i915))
 627                 return IRQ_NONE;
 628
 629         master_tile_ctl = dg1_master_intr_disable(regs);
 630         if (!master_tile_ctl) {
 631                 dg1_master_intr_enable(regs);
 632                 return IRQ_NONE;
 633         }
 634
 635         /* FIXME: we only support tile 0 for now. */
 636         if (master_tile_ctl & DG1_MSTR_TILE(0)) {
 637                 master_ctl = raw_reg_read(regs, GEN11_GFX_MSTR_IRQ);
 638                 raw_reg_write(regs, GEN11_GFX_MSTR_IRQ, master_ctl);
 639         } else {
 640                 drm_err(&i915->drm, "Tile not supported: 0x%08x\n",
 641                         master_tile_ctl);
 642                 dg1_master_intr_enable(regs);
 643                 return IRQ_NONE;
 644         }
 645
 646         gen11_gt_irq_handler(gt, master_ctl);
 647
 648         if (master_ctl & GEN11_DISPLAY_IRQ)
 649                 gen11_display_irq_handler(i915);
 650
 651         gu_misc_iir = gen11_gu_misc_irq_ack(i915, master_ctl);
 652
 653         dg1_master_intr_enable(regs);
 654
 655         gen11_gu_misc_irq_handler(i915, gu_misc_iir);
 656
 657         pmu_irq_stats(i915, IRQ_HANDLED);
 658
 659         return IRQ_HANDLED;
 660 }
 661
 662 static void ibx_irq_reset(struct drm_i915_private *dev_priv)
 663 {
 664         struct intel_uncore *uncore = &dev_priv->uncore;
 665
 666         if (HAS_PCH_NOP(dev_priv))
 667                 return;
 668
 669         GEN3_IRQ_RESET(uncore, SDE);
 670
 671         if (HAS_PCH_CPT(dev_priv) || HAS_PCH_LPT(dev_priv))
 672                 intel_uncore_write(&dev_priv->uncore, SERR_INT, 0xffffffff);
 673 }
 674
 675 /* drm_dma.h hooks
 676 */
 677 static void ilk_irq_reset(struct drm_i915_private *dev_priv)
 678 {
 679         struct intel_uncore *uncore = &dev_priv->uncore;
 680
 681         GEN3_IRQ_RESET(uncore, DE);
 682         dev_priv->irq_mask = ~0u;
 683
 684         if (GRAPHICS_VER(dev_priv) == 7)
 685                 intel_uncore_write(uncore, GEN7_ERR_INT, 0xffffffff);
 686
 687         if (IS_HASWELL(dev_priv)) {
 688                 intel_uncore_write(uncore, EDP_PSR_IMR, 0xffffffff);
 689                 intel_uncore_write(uncore, EDP_PSR_IIR, 0xffffffff);
 690         }
 691
 692         gen5_gt_irq_reset(to_gt(dev_priv));
 693
 694         ibx_irq_reset(dev_priv);
 695 }
 696
 697 static void valleyview_irq_reset(struct drm_i915_private *dev_priv)
 698 {
 699         intel_uncore_write(&dev_priv->uncore, VLV_MASTER_IER, 0);
 700         intel_uncore_posting_read(&dev_priv->uncore, VLV_MASTER_IER);
 701
 702         gen5_gt_irq_reset(to_gt(dev_priv));
 703
 704         spin_lock_irq(&dev_priv->irq_lock);
 705         if (dev_priv->display.irq.display_irqs_enabled)
 706                 vlv_display_irq_reset(dev_priv);
 707         spin_unlock_irq(&dev_priv->irq_lock);
 708 }
 709
 710 static void gen8_irq_reset(struct drm_i915_private *dev_priv)
 711 {
 712         struct intel_uncore *uncore = &dev_priv->uncore;
 713
 714         gen8_master_intr_disable(intel_uncore_regs(uncore));
 715
 716         gen8_gt_irq_reset(to_gt(dev_priv));
 717         gen8_display_irq_reset(dev_priv);
 718         GEN3_IRQ_RESET(uncore, GEN8_PCU_);
 719
 720         if (HAS_PCH_SPLIT(dev_priv))
 721                 ibx_irq_reset(dev_priv);
 722
 723 }
 724
 725 static void gen11_irq_reset(struct drm_i915_private *dev_priv)
 726 {
 727         struct intel_gt *gt = to_gt(dev_priv);
 728         struct intel_uncore *uncore = gt->uncore;
 729
 730         gen11_master_intr_disable(intel_uncore_regs(&dev_priv->uncore));
 731
 732         gen11_gt_irq_reset(gt);
 733         gen11_display_irq_reset(dev_priv);
 734
 735         GEN3_IRQ_RESET(uncore, GEN11_GU_MISC_);
 736         GEN3_IRQ_RESET(uncore, GEN8_PCU_);
 737 }
 738
 739 static void dg1_irq_reset(struct drm_i915_private *dev_priv)
 740 {
 741         struct intel_uncore *uncore = &dev_priv->uncore;
 742         struct intel_gt *gt;
 743         unsigned int i;
 744
 745         dg1_master_intr_disable(intel_uncore_regs(&dev_priv->uncore));
 746
 747         for_each_gt(gt, dev_priv, i)
 748                 gen11_gt_irq_reset(gt);
 749
 750         gen11_display_irq_reset(dev_priv);
 751
 752         GEN3_IRQ_RESET(uncore, GEN11_GU_MISC_);
 753         GEN3_IRQ_RESET(uncore, GEN8_PCU_);
 754
 755         intel_uncore_write(uncore, GEN11_GFX_MSTR_IRQ, ~0);
 756 }
 757
 758 static void cherryview_irq_reset(struct drm_i915_private *dev_priv)
 759 {
 760         struct intel_uncore *uncore = &dev_priv->uncore;
 761
 762         intel_uncore_write(uncore, GEN8_MASTER_IRQ, 0);
 763         intel_uncore_posting_read(&dev_priv->uncore, GEN8_MASTER_IRQ);
 764
 765         gen8_gt_irq_reset(to_gt(dev_priv));
 766
 767         GEN3_IRQ_RESET(uncore, GEN8_PCU_);
 768
 769         spin_lock_irq(&dev_priv->irq_lock);
 770         if (dev_priv->display.irq.display_irqs_enabled)
 771                 vlv_display_irq_reset(dev_priv);
 772         spin_unlock_irq(&dev_priv->irq_lock);
 773 }
 774
 775 static void ilk_irq_postinstall(struct drm_i915_private *dev_priv)
 776 {
 777         gen5_gt_irq_postinstall(to_gt(dev_priv));
 778
 779         ilk_de_irq_postinstall(dev_priv);
 780 }
 781
 782 static void valleyview_irq_postinstall(struct drm_i915_private *dev_priv)
 783 {
 784         gen5_gt_irq_postinstall(to_gt(dev_priv));
 785
 786         spin_lock_irq(&dev_priv->irq_lock);
 787         if (dev_priv->display.irq.display_irqs_enabled)
 788                 vlv_display_irq_postinstall(dev_priv);
 789         spin_unlock_irq(&dev_priv->irq_lock);
 790
 791         intel_uncore_write(&dev_priv->uncore, VLV_MASTER_IER, MASTER_INTERRUPT_ENABLE);
 792         intel_uncore_posting_read(&dev_priv->uncore, VLV_MASTER_IER);
 793 }
 794
 795 static void gen8_irq_postinstall(struct drm_i915_private *dev_priv)
 796 {
 797         gen8_gt_irq_postinstall(to_gt(dev_priv));
 798         gen8_de_irq_postinstall(dev_priv);
 799
 800         gen8_master_intr_enable(intel_uncore_regs(&dev_priv->uncore));
 801 }
 802
 803 static void gen11_irq_postinstall(struct drm_i915_private *dev_priv)
 804 {
 805         struct intel_gt *gt = to_gt(dev_priv);
 806         struct intel_uncore *uncore = gt->uncore;
 807         u32 gu_misc_masked = GEN11_GU_MISC_GSE;
 808
 809         gen11_gt_irq_postinstall(gt);
 810         gen11_de_irq_postinstall(dev_priv);
 811
 812         GEN3_IRQ_INIT(uncore, GEN11_GU_MISC_, ~gu_misc_masked, gu_misc_masked);
 813
 814         gen11_master_intr_enable(intel_uncore_regs(uncore));
 815         intel_uncore_posting_read(&dev_priv->uncore, GEN11_GFX_MSTR_IRQ);
 816 }
 817
 818 static void dg1_irq_postinstall(struct drm_i915_private *dev_priv)
 819 {
 820         struct intel_uncore *uncore = &dev_priv->uncore;
 821         u32 gu_misc_masked = GEN11_GU_MISC_GSE;
 822         struct intel_gt *gt;
 823         unsigned int i;
 824
 825         for_each_gt(gt, dev_priv, i)
 826                 gen11_gt_irq_postinstall(gt);
 827
 828         GEN3_IRQ_INIT(uncore, GEN11_GU_MISC_, ~gu_misc_masked, gu_misc_masked);
 829
 830         dg1_de_irq_postinstall(dev_priv);
 831
 832         dg1_master_intr_enable(intel_uncore_regs(uncore));
 833         intel_uncore_posting_read(uncore, DG1_MSTR_TILE_INTR);
 834 }
 835
 836 static void cherryview_irq_postinstall(struct drm_i915_private *dev_priv)
 837 {
 838         gen8_gt_irq_postinstall(to_gt(dev_priv));
 839
 840         spin_lock_irq(&dev_priv->irq_lock);
 841         if (dev_priv->display.irq.display_irqs_enabled)
 842                 vlv_display_irq_postinstall(dev_priv);
 843         spin_unlock_irq(&dev_priv->irq_lock);
 844
 845         intel_uncore_write(&dev_priv->uncore, GEN8_MASTER_IRQ, GEN8_MASTER_IRQ_CONTROL);
 846         intel_uncore_posting_read(&dev_priv->uncore, GEN8_MASTER_IRQ);
 847 }
 848
 849 static void i8xx_irq_reset(struct drm_i915_private *dev_priv)
 850 {
 851         struct intel_uncore *uncore = &dev_priv->uncore;
 852
 853         i9xx_pipestat_irq_reset(dev_priv);
 854
 855         gen2_irq_reset(uncore);
 856         dev_priv->irq_mask = ~0u;
 857 }
 858
 859 static u32 i9xx_error_mask(struct drm_i915_private *i915)
 860 {
 861         /*
 862          * On gen2/3 FBC generates (seemingly spurious)
 863          * display INVALID_GTT/INVALID_GTT_PTE table errors.
 864          *
 865          * Also gen3 bspec has this to say:
 866          * "DISPA_INVALID_GTT_PTE
 867          "  [DevNapa] : Reserved. This bit does not reflect the page
 868          "              table error for the display plane A."
 869          *
 870          * Unfortunately we can't mask off individual PGTBL_ER bits,
 871          * so we just have to mask off all page table errors via EMR.
 872          */
 873         if (HAS_FBC(i915))
 874                 return ~I915_ERROR_MEMORY_REFRESH;
 875         else
 876                 return ~(I915_ERROR_PAGE_TABLE |
 877                          I915_ERROR_MEMORY_REFRESH);
 878 }
 879
 880 static void i8xx_irq_postinstall(struct drm_i915_private *dev_priv)
 881 {
 882         struct intel_uncore *uncore = &dev_priv->uncore;
 883         u16 enable_mask;
 884
 885         intel_uncore_write16(uncore, EMR, i9xx_error_mask(dev_priv));
 886
 887         /* Unmask the interrupts that we always want on. */
 888         dev_priv->irq_mask =
 889                 ~(I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
 890                   I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
 891                   I915_MASTER_ERROR_INTERRUPT);
 892
 893         enable_mask =
 894                 I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
 895                 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
 896                 I915_MASTER_ERROR_INTERRUPT |
 897                 I915_USER_INTERRUPT;
 898
 899         gen2_irq_init(uncore, dev_priv->irq_mask, enable_mask);
 900
 901         /* Interrupt setup is already guaranteed to be single-threaded, this is
 902          * just to make the assert_spin_locked check happy. */
 903         spin_lock_irq(&dev_priv->irq_lock);
 904         i915_enable_pipestat(dev_priv, PIPE_A, PIPE_CRC_DONE_INTERRUPT_STATUS);
 905         i915_enable_pipestat(dev_priv, PIPE_B, PIPE_CRC_DONE_INTERRUPT_STATUS);
 906         spin_unlock_irq(&dev_priv->irq_lock);
 907 }
 908
 909 static void i8xx_error_irq_ack(struct drm_i915_private *i915,
 910                                u16 *eir, u16 *eir_stuck)
 911 {
 912         struct intel_uncore *uncore = &i915->uncore;
 913         u16 emr;
 914
 915         *eir = intel_uncore_read16(uncore, EIR);
 916         intel_uncore_write16(uncore, EIR, *eir);
 917
 918         *eir_stuck = intel_uncore_read16(uncore, EIR);
 919         if (*eir_stuck == 0)
 920                 return;
 921
 922         /*
 923          * Toggle all EMR bits to make sure we get an edge
 924          * in the ISR master error bit if we don't clear
 925          * all the EIR bits. Otherwise the edge triggered
 926          * IIR on i965/g4x wouldn't notice that an interrupt
 927          * is still pending. Also some EIR bits can't be
 928          * cleared except by handling the underlying error
 929          * (or by a GPU reset) so we mask any bit that
 930          * remains set.
 931          */
 932         emr = intel_uncore_read16(uncore, EMR);
 933         intel_uncore_write16(uncore, EMR, 0xffff);
 934         intel_uncore_write16(uncore, EMR, emr | *eir_stuck);
 935 }
 936
 937 static void i8xx_error_irq_handler(struct drm_i915_private *dev_priv,
 938                                    u16 eir, u16 eir_stuck)
 939 {
 940         drm_dbg(&dev_priv->drm, "Master Error: EIR 0x%04x\n", eir);
 941
 942         if (eir_stuck)
 943                 drm_dbg(&dev_priv->drm, "EIR stuck: 0x%04x, masked\n",
 944                         eir_stuck);
 945
 946         drm_dbg(&dev_priv->drm, "PGTBL_ER: 0x%08x\n",
 947                 intel_uncore_read(&dev_priv->uncore, PGTBL_ER));
 948 }
 949
 950 static void i9xx_error_irq_ack(struct drm_i915_private *dev_priv,
 951                                u32 *eir, u32 *eir_stuck)
 952 {
 953         u32 emr;
 954
 955         *eir = intel_uncore_read(&dev_priv->uncore, EIR);
 956         intel_uncore_write(&dev_priv->uncore, EIR, *eir);
 957
 958         *eir_stuck = intel_uncore_read(&dev_priv->uncore, EIR);
 959         if (*eir_stuck == 0)
 960                 return;
 961
 962         /*
 963          * Toggle all EMR bits to make sure we get an edge
 964          * in the ISR master error bit if we don't clear
 965          * all the EIR bits. Otherwise the edge triggered
 966          * IIR on i965/g4x wouldn't notice that an interrupt
 967          * is still pending. Also some EIR bits can't be
 968          * cleared except by handling the underlying error
 969          * (or by a GPU reset) so we mask any bit that
 970          * remains set.
 971          */
 972         emr = intel_uncore_read(&dev_priv->uncore, EMR);
 973         intel_uncore_write(&dev_priv->uncore, EMR, 0xffffffff);
 974         intel_uncore_write(&dev_priv->uncore, EMR, emr | *eir_stuck);
 975 }
 976
 977 static void i9xx_error_irq_handler(struct drm_i915_private *dev_priv,
 978                                    u32 eir, u32 eir_stuck)
 979 {
 980         drm_dbg(&dev_priv->drm, "Master Error, EIR 0x%08x\n", eir);
 981
 982         if (eir_stuck)
 983                 drm_dbg(&dev_priv->drm, "EIR stuck: 0x%08x, masked\n",
 984                         eir_stuck);
 985
 986         drm_dbg(&dev_priv->drm, "PGTBL_ER: 0x%08x\n",
 987                 intel_uncore_read(&dev_priv->uncore, PGTBL_ER));
 988 }
 989
 990 static irqreturn_t i8xx_irq_handler(int irq, void *arg)
 991 {
 992         struct drm_i915_private *dev_priv = arg;
 993         irqreturn_t ret = IRQ_NONE;
 994
 995         if (!intel_irqs_enabled(dev_priv))
 996                 return IRQ_NONE;
 997
 998         /* IRQs are synced during runtime_suspend, we don't require a wakeref */
 999         disable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
1000
1001         do {
1002                 u32 pipe_stats[I915_MAX_PIPES] = {};
1003                 u16 eir = 0, eir_stuck = 0;
1004                 u16 iir;
1005
1006                 iir = intel_uncore_read16(&dev_priv->uncore, GEN2_IIR);
1007                 if (iir == 0)
1008                         break;
1009
1010                 ret = IRQ_HANDLED;
1011
1012                 /* Call regardless, as some status bits might not be
1013                  * signalled in iir */
1014                 i9xx_pipestat_irq_ack(dev_priv, iir, pipe_stats);
1015
1016                 if (iir & I915_MASTER_ERROR_INTERRUPT)
1017                         i8xx_error_irq_ack(dev_priv, &eir, &eir_stuck);
1018
1019                 intel_uncore_write16(&dev_priv->uncore, GEN2_IIR, iir);
1020
1021                 if (iir & I915_USER_INTERRUPT)
1022                         intel_engine_cs_irq(to_gt(dev_priv)->engine[RCS0], iir);
1023
1024                 if (iir & I915_MASTER_ERROR_INTERRUPT)
1025                         i8xx_error_irq_handler(dev_priv, eir, eir_stuck);
1026
1027                 i8xx_pipestat_irq_handler(dev_priv, iir, pipe_stats);
1028         } while (0);
1029
1030         pmu_irq_stats(dev_priv, ret);
1031
1032         enable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
1033
1034         return ret;
1035 }
1036
1037 static void i915_irq_reset(struct drm_i915_private *dev_priv)
1038 {
1039         struct intel_uncore *uncore = &dev_priv->uncore;
1040
1041         if (I915_HAS_HOTPLUG(dev_priv)) {
1042                 i915_hotplug_interrupt_update(dev_priv, 0xffffffff, 0);
1043                 intel_uncore_rmw(&dev_priv->uncore, PORT_HOTPLUG_STAT, 0, 0);
1044         }
1045
1046         i9xx_pipestat_irq_reset(dev_priv);
1047
1048         GEN3_IRQ_RESET(uncore, GEN2_);
1049         dev_priv->irq_mask = ~0u;
1050 }
1051
1052 static void i915_irq_postinstall(struct drm_i915_private *dev_priv)
1053 {
1054         struct intel_uncore *uncore = &dev_priv->uncore;
1055         u32 enable_mask;
1056
1057         intel_uncore_write(uncore, EMR, i9xx_error_mask(dev_priv));
1058
1059         /* Unmask the interrupts that we always want on. */
1060         dev_priv->irq_mask =
1061                 ~(I915_ASLE_INTERRUPT |
1062                   I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
1063                   I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
1064                   I915_MASTER_ERROR_INTERRUPT);
1065
1066         enable_mask =
1067                 I915_ASLE_INTERRUPT |
1068                 I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
1069                 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
1070                 I915_MASTER_ERROR_INTERRUPT |
1071                 I915_USER_INTERRUPT;
1072
1073         if (I915_HAS_HOTPLUG(dev_priv)) {
1074                 /* Enable in IER... */
1075                 enable_mask |= I915_DISPLAY_PORT_INTERRUPT;
1076                 /* and unmask in IMR */
1077                 dev_priv->irq_mask &= ~I915_DISPLAY_PORT_INTERRUPT;
1078         }
1079
1080         GEN3_IRQ_INIT(uncore, GEN2_, dev_priv->irq_mask, enable_mask);
1081
1082         /* Interrupt setup is already guaranteed to be single-threaded, this is
1083          * just to make the assert_spin_locked check happy. */
1084         spin_lock_irq(&dev_priv->irq_lock);
1085         i915_enable_pipestat(dev_priv, PIPE_A, PIPE_CRC_DONE_INTERRUPT_STATUS);
1086         i915_enable_pipestat(dev_priv, PIPE_B, PIPE_CRC_DONE_INTERRUPT_STATUS);
1087         spin_unlock_irq(&dev_priv->irq_lock);
1088
1089         i915_enable_asle_pipestat(dev_priv);
1090 }
1091
1092 static irqreturn_t i915_irq_handler(int irq, void *arg)
1093 {
1094         struct drm_i915_private *dev_priv = arg;
1095         irqreturn_t ret = IRQ_NONE;
1096
1097         if (!intel_irqs_enabled(dev_priv))
1098                 return IRQ_NONE;
1099
1100         /* IRQs are synced during runtime_suspend, we don't require a wakeref */
1101         disable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
1102
1103         do {
1104                 u32 pipe_stats[I915_MAX_PIPES] = {};
1105                 u32 eir = 0, eir_stuck = 0;
1106                 u32 hotplug_status = 0;
1107                 u32 iir;
1108
1109                 iir = intel_uncore_read(&dev_priv->uncore, GEN2_IIR);
1110                 if (iir == 0)
1111                         break;
1112
1113                 ret = IRQ_HANDLED;
1114
1115                 if (I915_HAS_HOTPLUG(dev_priv) &&
1116                     iir & I915_DISPLAY_PORT_INTERRUPT)
1117                         hotplug_status = i9xx_hpd_irq_ack(dev_priv);
1118
1119                 /* Call regardless, as some status bits might not be
1120                  * signalled in iir */
1121                 i9xx_pipestat_irq_ack(dev_priv, iir, pipe_stats);
1122
1123                 if (iir & I915_MASTER_ERROR_INTERRUPT)
1124                         i9xx_error_irq_ack(dev_priv, &eir, &eir_stuck);
1125
1126                 intel_uncore_write(&dev_priv->uncore, GEN2_IIR, iir);
1127
1128                 if (iir & I915_USER_INTERRUPT)
1129                         intel_engine_cs_irq(to_gt(dev_priv)->engine[RCS0], iir);
1130
1131                 if (iir & I915_MASTER_ERROR_INTERRUPT)
1132                         i9xx_error_irq_handler(dev_priv, eir, eir_stuck);
1133
1134                 if (hotplug_status)
1135                         i9xx_hpd_irq_handler(dev_priv, hotplug_status);
1136
1137                 i915_pipestat_irq_handler(dev_priv, iir, pipe_stats);
1138         } while (0);
1139
1140         pmu_irq_stats(dev_priv, ret);
1141
1142         enable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
1143
1144         return ret;
1145 }
1146
1147 static void i965_irq_reset(struct drm_i915_private *dev_priv)
1148 {
1149         struct intel_uncore *uncore = &dev_priv->uncore;
1150
1151         i915_hotplug_interrupt_update(dev_priv, 0xffffffff, 0);
1152         intel_uncore_rmw(uncore, PORT_HOTPLUG_STAT, 0, 0);
1153
1154         i9xx_pipestat_irq_reset(dev_priv);
1155
1156         GEN3_IRQ_RESET(uncore, GEN2_);
1157         dev_priv->irq_mask = ~0u;
1158 }
1159
1160 static u32 i965_error_mask(struct drm_i915_private *i915)
1161 {
1162         /*
1163          * Enable some error detection, note the instruction error mask
1164          * bit is reserved, so we leave it masked.
1165          *
1166          * i965 FBC no longer generates spurious GTT errors,
1167          * so we can always enable the page table errors.
1168          */
1169         if (IS_G4X(i915))
1170                 return ~(GM45_ERROR_PAGE_TABLE |
1171                          GM45_ERROR_MEM_PRIV |
1172                          GM45_ERROR_CP_PRIV |
1173                          I915_ERROR_MEMORY_REFRESH);
1174         else
1175                 return ~(I915_ERROR_PAGE_TABLE |
1176                          I915_ERROR_MEMORY_REFRESH);
1177 }
1178
1179 static void i965_irq_postinstall(struct drm_i915_private *dev_priv)
1180 {
1181         struct intel_uncore *uncore = &dev_priv->uncore;
1182         u32 enable_mask;
1183
1184         intel_uncore_write(uncore, EMR, i965_error_mask(dev_priv));
1185
1186         /* Unmask the interrupts that we always want on. */
1187         dev_priv->irq_mask =
1188                 ~(I915_ASLE_INTERRUPT |
1189                   I915_DISPLAY_PORT_INTERRUPT |
1190                   I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
1191                   I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
1192                   I915_MASTER_ERROR_INTERRUPT);
1193
1194         enable_mask =
1195                 I915_ASLE_INTERRUPT |
1196                 I915_DISPLAY_PORT_INTERRUPT |
1197                 I915_DISPLAY_PIPE_A_EVENT_INTERRUPT |
1198                 I915_DISPLAY_PIPE_B_EVENT_INTERRUPT |
1199                 I915_MASTER_ERROR_INTERRUPT |
1200                 I915_USER_INTERRUPT;
1201
1202         if (IS_G4X(dev_priv))
1203                 enable_mask |= I915_BSD_USER_INTERRUPT;
1204
1205         GEN3_IRQ_INIT(uncore, GEN2_, dev_priv->irq_mask, enable_mask);
1206
1207         /* Interrupt setup is already guaranteed to be single-threaded, this is
1208          * just to make the assert_spin_locked check happy. */
1209         spin_lock_irq(&dev_priv->irq_lock);
1210         i915_enable_pipestat(dev_priv, PIPE_A, PIPE_GMBUS_INTERRUPT_STATUS);
1211         i915_enable_pipestat(dev_priv, PIPE_A, PIPE_CRC_DONE_INTERRUPT_STATUS);
1212         i915_enable_pipestat(dev_priv, PIPE_B, PIPE_CRC_DONE_INTERRUPT_STATUS);
1213         spin_unlock_irq(&dev_priv->irq_lock);
1214
1215         i915_enable_asle_pipestat(dev_priv);
1216 }
1217
1218 static irqreturn_t i965_irq_handler(int irq, void *arg)
1219 {
1220         struct drm_i915_private *dev_priv = arg;
1221         irqreturn_t ret = IRQ_NONE;
1222
1223         if (!intel_irqs_enabled(dev_priv))
1224                 return IRQ_NONE;
1225
1226         /* IRQs are synced during runtime_suspend, we don't require a wakeref */
1227         disable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
1228
1229         do {
1230                 u32 pipe_stats[I915_MAX_PIPES] = {};
1231                 u32 eir = 0, eir_stuck = 0;
1232                 u32 hotplug_status = 0;
1233                 u32 iir;
1234
1235                 iir = intel_uncore_read(&dev_priv->uncore, GEN2_IIR);
1236                 if (iir == 0)
1237                         break;
1238
1239                 ret = IRQ_HANDLED;
1240
1241                 if (iir & I915_DISPLAY_PORT_INTERRUPT)
1242                         hotplug_status = i9xx_hpd_irq_ack(dev_priv);
1243
1244                 /* Call regardless, as some status bits might not be
1245                  * signalled in iir */
1246                 i9xx_pipestat_irq_ack(dev_priv, iir, pipe_stats);
1247
1248                 if (iir & I915_MASTER_ERROR_INTERRUPT)
1249                         i9xx_error_irq_ack(dev_priv, &eir, &eir_stuck);
1250
1251                 intel_uncore_write(&dev_priv->uncore, GEN2_IIR, iir);
1252
1253                 if (iir & I915_USER_INTERRUPT)
1254                         intel_engine_cs_irq(to_gt(dev_priv)->engine[RCS0],
1255                                             iir);
1256
1257                 if (iir & I915_BSD_USER_INTERRUPT)
1258                         intel_engine_cs_irq(to_gt(dev_priv)->engine[VCS0],
1259                                             iir >> 25);
1260
1261                 if (iir & I915_MASTER_ERROR_INTERRUPT)
1262                         i9xx_error_irq_handler(dev_priv, eir, eir_stuck);
1263
1264                 if (hotplug_status)
1265                         i9xx_hpd_irq_handler(dev_priv, hotplug_status);
1266
1267                 i965_pipestat_irq_handler(dev_priv, iir, pipe_stats);
1268         } while (0);
1269
1270         pmu_irq_stats(dev_priv, IRQ_HANDLED);
1271
1272         enable_rpm_wakeref_asserts(&dev_priv->runtime_pm);
1273
1274         return ret;
1275 }
1276
1277 /**
1278  * intel_irq_init - initializes irq support
1279  * @dev_priv: i915 device instance
1280  *
1281  * This function initializes all the irq support including work items, timers
1282  * and all the vtables. It does not setup the interrupt itself though.
1283  */
1284 void intel_irq_init(struct drm_i915_private *dev_priv)
1285 {
1286         int i;
1287
1288         INIT_WORK(&dev_priv->l3_parity.error_work, ivb_parity_work);
1289         for (i = 0; i < MAX_L3_SLICES; ++i)
1290                 dev_priv->l3_parity.remap_info[i] = NULL;
1291
1292         /* pre-gen11 the guc irqs bits are in the upper 16 bits of the pm reg */
1293         if (HAS_GT_UC(dev_priv) && GRAPHICS_VER(dev_priv) < 11)
1294                 to_gt(dev_priv)->pm_guc_events = GUC_INTR_GUC2HOST << 16;
1295 }
1296
1297 /**
1298  * intel_irq_fini - deinitializes IRQ support
1299  * @i915: i915 device instance
1300  *
1301  * This function deinitializes all the IRQ support.
1302  */
1303 void intel_irq_fini(struct drm_i915_private *i915)
1304 {
1305         int i;
1306
1307         for (i = 0; i < MAX_L3_SLICES; ++i)
1308                 kfree(i915->l3_parity.remap_info[i]);
1309 }
1310
1311 static irq_handler_t intel_irq_handler(struct drm_i915_private *dev_priv)
1312 {
1313         if (HAS_GMCH(dev_priv)) {
1314                 if (IS_CHERRYVIEW(dev_priv))
1315                         return cherryview_irq_handler;
1316                 else if (IS_VALLEYVIEW(dev_priv))
1317                         return valleyview_irq_handler;
1318                 else if (GRAPHICS_VER(dev_priv) == 4)
1319                         return i965_irq_handler;
1320                 else if (GRAPHICS_VER(dev_priv) == 3)
1321                         return i915_irq_handler;
1322                 else
1323                         return i8xx_irq_handler;
1324         } else {
1325                 if (GRAPHICS_VER_FULL(dev_priv) >= IP_VER(12, 10))
1326                         return dg1_irq_handler;
1327                 else if (GRAPHICS_VER(dev_priv) >= 11)
1328                         return gen11_irq_handler;
1329                 else if (GRAPHICS_VER(dev_priv) >= 8)
1330                         return gen8_irq_handler;
1331                 else
1332                         return ilk_irq_handler;
1333         }
1334 }
1335
1336 static void intel_irq_reset(struct drm_i915_private *dev_priv)
1337 {
1338         if (HAS_GMCH(dev_priv)) {
1339                 if (IS_CHERRYVIEW(dev_priv))
1340                         cherryview_irq_reset(dev_priv);
1341                 else if (IS_VALLEYVIEW(dev_priv))
1342                         valleyview_irq_reset(dev_priv);
1343                 else if (GRAPHICS_VER(dev_priv) == 4)
1344                         i965_irq_reset(dev_priv);
1345                 else if (GRAPHICS_VER(dev_priv) == 3)
1346                         i915_irq_reset(dev_priv);
1347                 else
1348                         i8xx_irq_reset(dev_priv);
1349         } else {
1350                 if (GRAPHICS_VER_FULL(dev_priv) >= IP_VER(12, 10))
1351                         dg1_irq_reset(dev_priv);
1352                 else if (GRAPHICS_VER(dev_priv) >= 11)
1353                         gen11_irq_reset(dev_priv);
1354                 else if (GRAPHICS_VER(dev_priv) >= 8)
1355                         gen8_irq_reset(dev_priv);
1356                 else
1357                         ilk_irq_reset(dev_priv);
1358         }
1359 }
1360
1361 static void intel_irq_postinstall(struct drm_i915_private *dev_priv)
1362 {
1363         if (HAS_GMCH(dev_priv)) {
1364                 if (IS_CHERRYVIEW(dev_priv))
1365                         cherryview_irq_postinstall(dev_priv);
1366                 else if (IS_VALLEYVIEW(dev_priv))
1367                         valleyview_irq_postinstall(dev_priv);
1368                 else if (GRAPHICS_VER(dev_priv) == 4)
1369                         i965_irq_postinstall(dev_priv);
1370                 else if (GRAPHICS_VER(dev_priv) == 3)
1371                         i915_irq_postinstall(dev_priv);
1372                 else
1373                         i8xx_irq_postinstall(dev_priv);
1374         } else {
1375                 if (GRAPHICS_VER_FULL(dev_priv) >= IP_VER(12, 10))
1376                         dg1_irq_postinstall(dev_priv);
1377                 else if (GRAPHICS_VER(dev_priv) >= 11)
1378                         gen11_irq_postinstall(dev_priv);
1379                 else if (GRAPHICS_VER(dev_priv) >= 8)
1380                         gen8_irq_postinstall(dev_priv);
1381                 else
1382                         ilk_irq_postinstall(dev_priv);
1383         }
1384 }
1385
1386 /**
1387  * intel_irq_install - enables the hardware interrupt
1388  * @dev_priv: i915 device instance
1389  *
1390  * This function enables the hardware interrupt handling, but leaves the hotplug
1391  * handling still disabled. It is called after intel_irq_init().
1392  *
1393  * In the driver load and resume code we need working interrupts in a few places
1394  * but don't want to deal with the hassle of concurrent probe and hotplug
1395  * workers. Hence the split into this two-stage approach.
1396  */
1397 int intel_irq_install(struct drm_i915_private *dev_priv)
1398 {
1399         int irq = to_pci_dev(dev_priv->drm.dev)->irq;
1400         int ret;
1401
1402         /*
1403          * We enable some interrupt sources in our postinstall hooks, so mark
1404          * interrupts as enabled _before_ actually enabling them to avoid
1405          * special cases in our ordering checks.
1406          */
1407         dev_priv->runtime_pm.irqs_enabled = true;
1408
1409         dev_priv->irq_enabled = true;
1410
1411         intel_irq_reset(dev_priv);
1412
1413         ret = request_irq(irq, intel_irq_handler(dev_priv),
1414                           IRQF_SHARED, DRIVER_NAME, dev_priv);
1415         if (ret < 0) {
1416                 dev_priv->irq_enabled = false;
1417                 return ret;
1418         }
1419
1420         intel_irq_postinstall(dev_priv);
1421
1422         return ret;
1423 }
1424
1425 /**
1426  * intel_irq_uninstall - finilizes all irq handling
1427  * @dev_priv: i915 device instance
1428  *
1429  * This stops interrupt and hotplug handling and unregisters and frees all
1430  * resources acquired in the init functions.
1431  */
1432 void intel_irq_uninstall(struct drm_i915_private *dev_priv)
1433 {
1434         int irq = to_pci_dev(dev_priv->drm.dev)->irq;
1435
1436         /*
1437          * FIXME we can get called twice during driver probe
1438          * error handling as well as during driver remove due to
1439          * intel_display_driver_remove() calling us out of sequence.
1440          * Would be nice if it didn't do that...
1441          */
1442         if (!dev_priv->irq_enabled)
1443                 return;
1444
1445         dev_priv->irq_enabled = false;
1446
1447         intel_irq_reset(dev_priv);
1448
1449         free_irq(irq, dev_priv);
1450
1451         intel_hpd_cancel_work(dev_priv);
1452         dev_priv->runtime_pm.irqs_enabled = false;
1453 }
1454
1455 /**
1456  * intel_runtime_pm_disable_interrupts - runtime interrupt disabling
1457  * @dev_priv: i915 device instance
1458  *
1459  * This function is used to disable interrupts at runtime, both in the runtime
1460  * pm and the system suspend/resume code.
1461  */
1462 void intel_runtime_pm_disable_interrupts(struct drm_i915_private *dev_priv)
1463 {
1464         intel_irq_reset(dev_priv);
1465         dev_priv->runtime_pm.irqs_enabled = false;
1466         intel_synchronize_irq(dev_priv);
1467 }
1468
1469 /**
1470  * intel_runtime_pm_enable_interrupts - runtime interrupt enabling
1471  * @dev_priv: i915 device instance
1472  *
1473  * This function is used to enable interrupts at runtime, both in the runtime
1474  * pm and the system suspend/resume code.
1475  */
1476 void intel_runtime_pm_enable_interrupts(struct drm_i915_private *dev_priv)
1477 {
1478         dev_priv->runtime_pm.irqs_enabled = true;
1479         intel_irq_reset(dev_priv);
1480         intel_irq_postinstall(dev_priv);
1481 }
1482
1483 bool intel_irqs_enabled(struct drm_i915_private *dev_priv)
1484 {
1485         return dev_priv->runtime_pm.irqs_enabled;
1486 }
1487
1488 void intel_synchronize_irq(struct drm_i915_private *i915)
1489 {
1490         synchronize_irq(to_pci_dev(i915->drm.dev)->irq);
1491 }
1492
1493 void intel_synchronize_hardirq(struct drm_i915_private *i915)
1494 {
1495         synchronize_hardirq(to_pci_dev(i915->drm.dev)->irq);
1496 }