drivers/gpu/drm/radeon/radeon_irq_kms.c

   1 /*
   2  * Copyright 2008 Advanced Micro Devices, Inc.
   3  * Copyright 2008 Red Hat Inc.
   4  * Copyright 2009 Jerome Glisse.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  *
  24  * Authors: Dave Airlie
  25  *          Alex Deucher
  26  *          Jerome Glisse
  27  */
  28 #include <drm/drmP.h>
  29 #include <drm/drm_crtc_helper.h>
  30 #include <drm/radeon_drm.h>
  31 #include "radeon_reg.h"
  32 #include "radeon.h"
  33 #include "atom.h"
  34
  35 #include <linux/pm_runtime.h>
  36
  37 #define RADEON_WAIT_IDLE_TIMEOUT 200
  38
  39 /**
  40  * radeon_driver_irq_handler_kms - irq handler for KMS
  41  *
  42  * @int irq, void *arg: args
  43  *
  44  * This is the irq handler for the radeon KMS driver (all asics).
  45  * radeon_irq_process is a macro that points to the per-asic
  46  * irq handler callback.
  47  */
  48 irqreturn_t radeon_driver_irq_handler_kms(int irq, void *arg)
  49 {
  50         struct drm_device *dev = (struct drm_device *) arg;
  51         struct radeon_device *rdev = dev->dev_private;
  52         irqreturn_t ret;
  53
  54         ret = radeon_irq_process(rdev);
  55         if (ret == IRQ_HANDLED)
  56                 pm_runtime_mark_last_busy(dev->dev);
  57         return ret;
  58 }
  59
  60 /*
  61  * Handle hotplug events outside the interrupt handler proper.
  62  */
  63 /**
  64  * radeon_hotplug_work_func - display hotplug work handler
  65  *
  66  * @work: work struct
  67  *
  68  * This is the hot plug event work handler (all asics).
  69  * The work gets scheduled from the irq handler if there
  70  * was a hot plug interrupt.  It walks the connector table
  71  * and calls the hotplug handler for each one, then sends
  72  * a drm hotplug event to alert userspace.
  73  */
  74 static void radeon_hotplug_work_func(struct work_struct *work)
  75 {
  76         struct radeon_device *rdev = container_of(work, struct radeon_device,
  77                                                   hotplug_work);
  78         struct drm_device *dev = rdev->ddev;
  79         struct drm_mode_config *mode_config = &dev->mode_config;
  80         struct drm_connector *connector;
  81
  82         mutex_lock(&mode_config->mutex);
  83         if (mode_config->num_connector) {
  84                 list_for_each_entry(connector, &mode_config->connector_list, head)
  85                         radeon_connector_hotplug(connector);
  86         }
  87         mutex_unlock(&mode_config->mutex);
  88         /* Just fire off a uevent and let userspace tell us what to do */
  89         drm_helper_hpd_irq_event(dev);
  90 }
  91
  92 static void radeon_dp_work_func(struct work_struct *work)
  93 {
  94         struct radeon_device *rdev = container_of(work, struct radeon_device,
  95                                                   dp_work);
  96         struct drm_device *dev = rdev->ddev;
  97         struct drm_mode_config *mode_config = &dev->mode_config;
  98         struct drm_connector *connector;
  99
 100         /* this should take a mutex */
 101         if (mode_config->num_connector) {
 102                 list_for_each_entry(connector, &mode_config->connector_list, head)
 103                         radeon_connector_hotplug(connector);
 104         }
 105 }
 106 /**
 107  * radeon_driver_irq_preinstall_kms - drm irq preinstall callback
 108  *
 109  * @dev: drm dev pointer
 110  *
 111  * Gets the hw ready to enable irqs (all asics).
 112  * This function disables all interrupt sources on the GPU.
 113  */
 114 void radeon_driver_irq_preinstall_kms(struct drm_device *dev)
 115 {
 116         struct radeon_device *rdev = dev->dev_private;
 117         unsigned long irqflags;
 118         unsigned i;
 119
 120         spin_lock_irqsave(&rdev->irq.lock, irqflags);
 121         /* Disable *all* interrupts */
 122         for (i = 0; i < RADEON_NUM_RINGS; i++)
 123                 atomic_set(&rdev->irq.ring_int[i], 0);
 124         rdev->irq.dpm_thermal = false;
 125         for (i = 0; i < RADEON_MAX_HPD_PINS; i++)
 126                 rdev->irq.hpd[i] = false;
 127         for (i = 0; i < RADEON_MAX_CRTCS; i++) {
 128                 rdev->irq.crtc_vblank_int[i] = false;
 129                 atomic_set(&rdev->irq.pflip[i], 0);
 130                 rdev->irq.afmt[i] = false;
 131         }
 132         radeon_irq_set(rdev);
 133         spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 134         /* Clear bits */
 135         radeon_irq_process(rdev);
 136 }
 137
 138 /**
 139  * radeon_driver_irq_postinstall_kms - drm irq preinstall callback
 140  *
 141  * @dev: drm dev pointer
 142  *
 143  * Handles stuff to be done after enabling irqs (all asics).
 144  * Returns 0 on success.
 145  */
 146 int radeon_driver_irq_postinstall_kms(struct drm_device *dev)
 147 {
 148         dev->max_vblank_count = 0x001fffff;
 149         return 0;
 150 }
 151
 152 /**
 153  * radeon_driver_irq_uninstall_kms - drm irq uninstall callback
 154  *
 155  * @dev: drm dev pointer
 156  *
 157  * This function disables all interrupt sources on the GPU (all asics).
 158  */
 159 void radeon_driver_irq_uninstall_kms(struct drm_device *dev)
 160 {
 161         struct radeon_device *rdev = dev->dev_private;
 162         unsigned long irqflags;
 163         unsigned i;
 164
 165         if (rdev == NULL) {
 166                 return;
 167         }
 168         spin_lock_irqsave(&rdev->irq.lock, irqflags);
 169         /* Disable *all* interrupts */
 170         for (i = 0; i < RADEON_NUM_RINGS; i++)
 171                 atomic_set(&rdev->irq.ring_int[i], 0);
 172         rdev->irq.dpm_thermal = false;
 173         for (i = 0; i < RADEON_MAX_HPD_PINS; i++)
 174                 rdev->irq.hpd[i] = false;
 175         for (i = 0; i < RADEON_MAX_CRTCS; i++) {
 176                 rdev->irq.crtc_vblank_int[i] = false;
 177                 atomic_set(&rdev->irq.pflip[i], 0);
 178                 rdev->irq.afmt[i] = false;
 179         }
 180         radeon_irq_set(rdev);
 181         spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 182 }
 183
 184 /**
 185  * radeon_msi_ok - asic specific msi checks
 186  *
 187  * @rdev: radeon device pointer
 188  *
 189  * Handles asic specific MSI checks to determine if
 190  * MSIs should be enabled on a particular chip (all asics).
 191  * Returns true if MSIs should be enabled, false if MSIs
 192  * should not be enabled.
 193  */
 194 static bool radeon_msi_ok(struct radeon_device *rdev)
 195 {
 196         /* RV370/RV380 was first asic with MSI support */
 197         if (rdev->family < CHIP_RV380)
 198                 return false;
 199
 200         /* MSIs don't work on AGP */
 201         if (rdev->flags & RADEON_IS_AGP)
 202                 return false;
 203
 204         /*
 205          * Older chips have a HW limitation, they can only generate 40 bits
 206          * of address for "64-bit" MSIs which breaks on some platforms, notably
 207          * IBM POWER servers, so we limit them
 208          */
 209         if (rdev->family < CHIP_BONAIRE) {
 210                 dev_info(rdev->dev, "radeon: MSI limited to 32-bit\n");
 211                 rdev->pdev->no_64bit_msi = 1;
 212         }
 213
 214         /* force MSI on */
 215         if (radeon_msi == 1)
 216                 return true;
 217         else if (radeon_msi == 0)
 218                 return false;
 219
 220         /* Quirks */
 221         /* HP RS690 only seems to work with MSIs. */
 222         if ((rdev->pdev->device == 0x791f) &&
 223             (rdev->pdev->subsystem_vendor == 0x103c) &&
 224             (rdev->pdev->subsystem_device == 0x30c2))
 225                 return true;
 226
 227         /* Dell RS690 only seems to work with MSIs. */
 228         if ((rdev->pdev->device == 0x791f) &&
 229             (rdev->pdev->subsystem_vendor == 0x1028) &&
 230             (rdev->pdev->subsystem_device == 0x01fc))
 231                 return true;
 232
 233         /* Dell RS690 only seems to work with MSIs. */
 234         if ((rdev->pdev->device == 0x791f) &&
 235             (rdev->pdev->subsystem_vendor == 0x1028) &&
 236             (rdev->pdev->subsystem_device == 0x01fd))
 237                 return true;
 238
 239         /* Gateway RS690 only seems to work with MSIs. */
 240         if ((rdev->pdev->device == 0x791f) &&
 241             (rdev->pdev->subsystem_vendor == 0x107b) &&
 242             (rdev->pdev->subsystem_device == 0x0185))
 243                 return true;
 244
 245         /* try and enable MSIs by default on all RS690s */
 246         if (rdev->family == CHIP_RS690)
 247                 return true;
 248
 249         /* RV515 seems to have MSI issues where it loses
 250          * MSI rearms occasionally. This leads to lockups and freezes.
 251          * disable it by default.
 252          */
 253         if (rdev->family == CHIP_RV515)
 254                 return false;
 255         if (rdev->flags & RADEON_IS_IGP) {
 256                 /* APUs work fine with MSIs */
 257                 if (rdev->family >= CHIP_PALM)
 258                         return true;
 259                 /* lots of IGPs have problems with MSIs */
 260                 return false;
 261         }
 262
 263         return true;
 264 }
 265
 266 /**
 267  * radeon_irq_kms_init - init driver interrupt info
 268  *
 269  * @rdev: radeon device pointer
 270  *
 271  * Sets up the work irq handlers, vblank init, MSIs, etc. (all asics).
 272  * Returns 0 for success, error for failure.
 273  */
 274 int radeon_irq_kms_init(struct radeon_device *rdev)
 275 {
 276         int r = 0;
 277
 278         spin_lock_init(&rdev->irq.lock);
 279         r = drm_vblank_init(rdev->ddev, rdev->num_crtc);
 280         if (r) {
 281                 return r;
 282         }
 283         /* enable msi */
 284         rdev->msi_enabled = 0;
 285
 286         if (radeon_msi_ok(rdev)) {
 287                 int ret = pci_enable_msi(rdev->pdev);
 288                 if (!ret) {
 289                         rdev->msi_enabled = 1;
 290                         dev_info(rdev->dev, "radeon: using MSI.\n");
 291                 }
 292         }
 293
 294         INIT_WORK(&rdev->hotplug_work, radeon_hotplug_work_func);
 295         INIT_WORK(&rdev->dp_work, radeon_dp_work_func);
 296         INIT_WORK(&rdev->audio_work, r600_audio_update_hdmi);
 297
 298         rdev->irq.installed = true;
 299         r = drm_irq_install(rdev->ddev, rdev->ddev->pdev->irq);
 300         if (r) {
 301                 rdev->irq.installed = false;
 302                 flush_work(&rdev->hotplug_work);
 303                 return r;
 304         }
 305
 306         DRM_INFO("radeon: irq initialized.\n");
 307         return 0;
 308 }
 309
 310 /**
 311  * radeon_irq_kms_fini - tear down driver interrupt info
 312  *
 313  * @rdev: radeon device pointer
 314  *
 315  * Tears down the work irq handlers, vblank handlers, MSIs, etc. (all asics).
 316  */
 317 void radeon_irq_kms_fini(struct radeon_device *rdev)
 318 {
 319         drm_vblank_cleanup(rdev->ddev);
 320         if (rdev->irq.installed) {
 321                 drm_irq_uninstall(rdev->ddev);
 322                 rdev->irq.installed = false;
 323                 if (rdev->msi_enabled)
 324                         pci_disable_msi(rdev->pdev);
 325                 flush_work(&rdev->hotplug_work);
 326         }
 327 }
 328
 329 /**
 330  * radeon_irq_kms_sw_irq_get - enable software interrupt
 331  *
 332  * @rdev: radeon device pointer
 333  * @ring: ring whose interrupt you want to enable
 334  *
 335  * Enables the software interrupt for a specific ring (all asics).
 336  * The software interrupt is generally used to signal a fence on
 337  * a particular ring.
 338  */
 339 void radeon_irq_kms_sw_irq_get(struct radeon_device *rdev, int ring)
 340 {
 341         unsigned long irqflags;
 342
 343         if (!rdev->ddev->irq_enabled)
 344                 return;
 345
 346         if (atomic_inc_return(&rdev->irq.ring_int[ring]) == 1) {
 347                 spin_lock_irqsave(&rdev->irq.lock, irqflags);
 348                 radeon_irq_set(rdev);
 349                 spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 350         }
 351 }
 352
 353 /**
 354  * radeon_irq_kms_sw_irq_get_delayed - enable software interrupt
 355  *
 356  * @rdev: radeon device pointer
 357  * @ring: ring whose interrupt you want to enable
 358  *
 359  * Enables the software interrupt for a specific ring (all asics).
 360  * The software interrupt is generally used to signal a fence on
 361  * a particular ring.
 362  */
 363 bool radeon_irq_kms_sw_irq_get_delayed(struct radeon_device *rdev, int ring)
 364 {
 365         return atomic_inc_return(&rdev->irq.ring_int[ring]) == 1;
 366 }
 367
 368 /**
 369  * radeon_irq_kms_sw_irq_put - disable software interrupt
 370  *
 371  * @rdev: radeon device pointer
 372  * @ring: ring whose interrupt you want to disable
 373  *
 374  * Disables the software interrupt for a specific ring (all asics).
 375  * The software interrupt is generally used to signal a fence on
 376  * a particular ring.
 377  */
 378 void radeon_irq_kms_sw_irq_put(struct radeon_device *rdev, int ring)
 379 {
 380         unsigned long irqflags;
 381
 382         if (!rdev->ddev->irq_enabled)
 383                 return;
 384
 385         if (atomic_dec_and_test(&rdev->irq.ring_int[ring])) {
 386                 spin_lock_irqsave(&rdev->irq.lock, irqflags);
 387                 radeon_irq_set(rdev);
 388                 spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 389         }
 390 }
 391
 392 /**
 393  * radeon_irq_kms_pflip_irq_get - enable pageflip interrupt
 394  *
 395  * @rdev: radeon device pointer
 396  * @crtc: crtc whose interrupt you want to enable
 397  *
 398  * Enables the pageflip interrupt for a specific crtc (all asics).
 399  * For pageflips we use the vblank interrupt source.
 400  */
 401 void radeon_irq_kms_pflip_irq_get(struct radeon_device *rdev, int crtc)
 402 {
 403         unsigned long irqflags;
 404
 405         if (crtc < 0 || crtc >= rdev->num_crtc)
 406                 return;
 407
 408         if (!rdev->ddev->irq_enabled)
 409                 return;
 410
 411         if (atomic_inc_return(&rdev->irq.pflip[crtc]) == 1) {
 412                 spin_lock_irqsave(&rdev->irq.lock, irqflags);
 413                 radeon_irq_set(rdev);
 414                 spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 415         }
 416 }
 417
 418 /**
 419  * radeon_irq_kms_pflip_irq_put - disable pageflip interrupt
 420  *
 421  * @rdev: radeon device pointer
 422  * @crtc: crtc whose interrupt you want to disable
 423  *
 424  * Disables the pageflip interrupt for a specific crtc (all asics).
 425  * For pageflips we use the vblank interrupt source.
 426  */
 427 void radeon_irq_kms_pflip_irq_put(struct radeon_device *rdev, int crtc)
 428 {
 429         unsigned long irqflags;
 430
 431         if (crtc < 0 || crtc >= rdev->num_crtc)
 432                 return;
 433
 434         if (!rdev->ddev->irq_enabled)
 435                 return;
 436
 437         if (atomic_dec_and_test(&rdev->irq.pflip[crtc])) {
 438                 spin_lock_irqsave(&rdev->irq.lock, irqflags);
 439                 radeon_irq_set(rdev);
 440                 spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 441         }
 442 }
 443
 444 /**
 445  * radeon_irq_kms_enable_afmt - enable audio format change interrupt
 446  *
 447  * @rdev: radeon device pointer
 448  * @block: afmt block whose interrupt you want to enable
 449  *
 450  * Enables the afmt change interrupt for a specific afmt block (all asics).
 451  */
 452 void radeon_irq_kms_enable_afmt(struct radeon_device *rdev, int block)
 453 {
 454         unsigned long irqflags;
 455
 456         if (!rdev->ddev->irq_enabled)
 457                 return;
 458
 459         spin_lock_irqsave(&rdev->irq.lock, irqflags);
 460         rdev->irq.afmt[block] = true;
 461         radeon_irq_set(rdev);
 462         spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 463
 464 }
 465
 466 /**
 467  * radeon_irq_kms_disable_afmt - disable audio format change interrupt
 468  *
 469  * @rdev: radeon device pointer
 470  * @block: afmt block whose interrupt you want to disable
 471  *
 472  * Disables the afmt change interrupt for a specific afmt block (all asics).
 473  */
 474 void radeon_irq_kms_disable_afmt(struct radeon_device *rdev, int block)
 475 {
 476         unsigned long irqflags;
 477
 478         if (!rdev->ddev->irq_enabled)
 479                 return;
 480
 481         spin_lock_irqsave(&rdev->irq.lock, irqflags);
 482         rdev->irq.afmt[block] = false;
 483         radeon_irq_set(rdev);
 484         spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 485 }
 486
 487 /**
 488  * radeon_irq_kms_enable_hpd - enable hotplug detect interrupt
 489  *
 490  * @rdev: radeon device pointer
 491  * @hpd_mask: mask of hpd pins you want to enable.
 492  *
 493  * Enables the hotplug detect interrupt for a specific hpd pin (all asics).
 494  */
 495 void radeon_irq_kms_enable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
 496 {
 497         unsigned long irqflags;
 498         int i;
 499
 500         if (!rdev->ddev->irq_enabled)
 501                 return;
 502
 503         spin_lock_irqsave(&rdev->irq.lock, irqflags);
 504         for (i = 0; i < RADEON_MAX_HPD_PINS; ++i)
 505                 rdev->irq.hpd[i] |= !!(hpd_mask & (1 << i));
 506         radeon_irq_set(rdev);
 507         spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 508 }
 509
 510 /**
 511  * radeon_irq_kms_disable_hpd - disable hotplug detect interrupt
 512  *
 513  * @rdev: radeon device pointer
 514  * @hpd_mask: mask of hpd pins you want to disable.
 515  *
 516  * Disables the hotplug detect interrupt for a specific hpd pin (all asics).
 517  */
 518 void radeon_irq_kms_disable_hpd(struct radeon_device *rdev, unsigned hpd_mask)
 519 {
 520         unsigned long irqflags;
 521         int i;
 522
 523         if (!rdev->ddev->irq_enabled)
 524                 return;
 525
 526         spin_lock_irqsave(&rdev->irq.lock, irqflags);
 527         for (i = 0; i < RADEON_MAX_HPD_PINS; ++i)
 528                 rdev->irq.hpd[i] &= !(hpd_mask & (1 << i));
 529         radeon_irq_set(rdev);
 530         spin_unlock_irqrestore(&rdev->irq.lock, irqflags);
 531 }
 532