drivers/gpu/drm/i915/intel_pipe_crc.c

   1 /*
   2  * Copyright © 2013 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Author: Damien Lespiau <[email protected]>
  24  *
  25  */
  26
  27 #include <linux/seq_file.h>
  28 #include <linux/circ_buf.h>
  29 #include <linux/ctype.h>
  30 #include <linux/debugfs.h>
  31 #include "intel_drv.h"
  32
  33 struct pipe_crc_info {
  34         const char *name;
  35         struct drm_i915_private *dev_priv;
  36         enum pipe pipe;
  37 };
  38
  39 static int i915_pipe_crc_open(struct inode *inode, struct file *filep)
  40 {
  41         struct pipe_crc_info *info = inode->i_private;
  42         struct drm_i915_private *dev_priv = info->dev_priv;
  43         struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[info->pipe];
  44
  45         if (info->pipe >= INTEL_INFO(dev_priv)->num_pipes)
  46                 return -ENODEV;
  47
  48         spin_lock_irq(&pipe_crc->lock);
  49
  50         if (pipe_crc->opened) {
  51                 spin_unlock_irq(&pipe_crc->lock);
  52                 return -EBUSY; /* already open */
  53         }
  54
  55         pipe_crc->opened = true;
  56         filep->private_data = inode->i_private;
  57
  58         spin_unlock_irq(&pipe_crc->lock);
  59
  60         return 0;
  61 }
  62
  63 static int i915_pipe_crc_release(struct inode *inode, struct file *filep)
  64 {
  65         struct pipe_crc_info *info = inode->i_private;
  66         struct drm_i915_private *dev_priv = info->dev_priv;
  67         struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[info->pipe];
  68
  69         spin_lock_irq(&pipe_crc->lock);
  70         pipe_crc->opened = false;
  71         spin_unlock_irq(&pipe_crc->lock);
  72
  73         return 0;
  74 }
  75
  76 /* (6 fields, 8 chars each, space separated (5) + '\n') */
  77 #define PIPE_CRC_LINE_LEN       (6 * 8 + 5 + 1)
  78 /* account for \'0' */
  79 #define PIPE_CRC_BUFFER_LEN     (PIPE_CRC_LINE_LEN + 1)
  80
  81 static int pipe_crc_data_count(struct intel_pipe_crc *pipe_crc)
  82 {
  83         lockdep_assert_held(&pipe_crc->lock);
  84         return CIRC_CNT(pipe_crc->head, pipe_crc->tail,
  85                         INTEL_PIPE_CRC_ENTRIES_NR);
  86 }
  87
  88 static ssize_t
  89 i915_pipe_crc_read(struct file *filep, char __user *user_buf, size_t count,
  90                    loff_t *pos)
  91 {
  92         struct pipe_crc_info *info = filep->private_data;
  93         struct drm_i915_private *dev_priv = info->dev_priv;
  94         struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[info->pipe];
  95         char buf[PIPE_CRC_BUFFER_LEN];
  96         int n_entries;
  97         ssize_t bytes_read;
  98
  99         /*
 100          * Don't allow user space to provide buffers not big enough to hold
 101          * a line of data.
 102          */
 103         if (count < PIPE_CRC_LINE_LEN)
 104                 return -EINVAL;
 105
 106         if (pipe_crc->source == INTEL_PIPE_CRC_SOURCE_NONE)
 107                 return 0;
 108
 109         /* nothing to read */
 110         spin_lock_irq(&pipe_crc->lock);
 111         while (pipe_crc_data_count(pipe_crc) == 0) {
 112                 int ret;
 113
 114                 if (filep->f_flags & O_NONBLOCK) {
 115                         spin_unlock_irq(&pipe_crc->lock);
 116                         return -EAGAIN;
 117                 }
 118
 119                 ret = wait_event_interruptible_lock_irq(pipe_crc->wq,
 120                                 pipe_crc_data_count(pipe_crc), pipe_crc->lock);
 121                 if (ret) {
 122                         spin_unlock_irq(&pipe_crc->lock);
 123                         return ret;
 124                 }
 125         }
 126
 127         /* We now have one or more entries to read */
 128         n_entries = count / PIPE_CRC_LINE_LEN;
 129
 130         bytes_read = 0;
 131         while (n_entries > 0) {
 132                 struct intel_pipe_crc_entry *entry =
 133                         &pipe_crc->entries[pipe_crc->tail];
 134
 135                 if (CIRC_CNT(pipe_crc->head, pipe_crc->tail,
 136                              INTEL_PIPE_CRC_ENTRIES_NR) < 1)
 137                         break;
 138
 139                 BUILD_BUG_ON_NOT_POWER_OF_2(INTEL_PIPE_CRC_ENTRIES_NR);
 140                 pipe_crc->tail = (pipe_crc->tail + 1) &
 141                                  (INTEL_PIPE_CRC_ENTRIES_NR - 1);
 142
 143                 bytes_read += snprintf(buf, PIPE_CRC_BUFFER_LEN,
 144                                        "%8u %8x %8x %8x %8x %8x\n",
 145                                        entry->frame, entry->crc[0],
 146                                        entry->crc[1], entry->crc[2],
 147                                        entry->crc[3], entry->crc[4]);
 148
 149                 spin_unlock_irq(&pipe_crc->lock);
 150
 151                 if (copy_to_user(user_buf, buf, PIPE_CRC_LINE_LEN))
 152                         return -EFAULT;
 153
 154                 user_buf += PIPE_CRC_LINE_LEN;
 155                 n_entries--;
 156
 157                 spin_lock_irq(&pipe_crc->lock);
 158         }
 159
 160         spin_unlock_irq(&pipe_crc->lock);
 161
 162         return bytes_read;
 163 }
 164
 165 static const struct file_operations i915_pipe_crc_fops = {
 166         .owner = THIS_MODULE,
 167         .open = i915_pipe_crc_open,
 168         .read = i915_pipe_crc_read,
 169         .release = i915_pipe_crc_release,
 170 };
 171
 172 static struct pipe_crc_info i915_pipe_crc_data[I915_MAX_PIPES] = {
 173         {
 174                 .name = "i915_pipe_A_crc",
 175                 .pipe = PIPE_A,
 176         },
 177         {
 178                 .name = "i915_pipe_B_crc",
 179                 .pipe = PIPE_B,
 180         },
 181         {
 182                 .name = "i915_pipe_C_crc",
 183                 .pipe = PIPE_C,
 184         },
 185 };
 186
 187 static const char * const pipe_crc_sources[] = {
 188         "none",
 189         "plane1",
 190         "plane2",
 191         "pf",
 192         "pipe",
 193         "TV",
 194         "DP-B",
 195         "DP-C",
 196         "DP-D",
 197         "auto",
 198 };
 199
 200 static const char *pipe_crc_source_name(enum intel_pipe_crc_source source)
 201 {
 202         BUILD_BUG_ON(ARRAY_SIZE(pipe_crc_sources) != INTEL_PIPE_CRC_SOURCE_MAX);
 203         return pipe_crc_sources[source];
 204 }
 205
 206 static int display_crc_ctl_show(struct seq_file *m, void *data)
 207 {
 208         struct drm_i915_private *dev_priv = m->private;
 209         enum pipe pipe;
 210
 211         for_each_pipe(dev_priv, pipe)
 212                 seq_printf(m, "%c %s\n", pipe_name(pipe),
 213                            pipe_crc_source_name(dev_priv->pipe_crc[pipe].source));
 214
 215         return 0;
 216 }
 217
 218 static int display_crc_ctl_open(struct inode *inode, struct file *file)
 219 {
 220         return single_open(file, display_crc_ctl_show, inode->i_private);
 221 }
 222
 223 static int i8xx_pipe_crc_ctl_reg(enum intel_pipe_crc_source *source,
 224                                  uint32_t *val)
 225 {
 226         if (*source == INTEL_PIPE_CRC_SOURCE_AUTO)
 227                 *source = INTEL_PIPE_CRC_SOURCE_PIPE;
 228
 229         switch (*source) {
 230         case INTEL_PIPE_CRC_SOURCE_PIPE:
 231                 *val = PIPE_CRC_ENABLE | PIPE_CRC_INCLUDE_BORDER_I8XX;
 232                 break;
 233         case INTEL_PIPE_CRC_SOURCE_NONE:
 234                 *val = 0;
 235                 break;
 236         default:
 237                 return -EINVAL;
 238         }
 239
 240         return 0;
 241 }
 242
 243 static int i9xx_pipe_crc_auto_source(struct drm_i915_private *dev_priv,
 244                                      enum pipe pipe,
 245                                      enum intel_pipe_crc_source *source)
 246 {
 247         struct drm_device *dev = &dev_priv->drm;
 248         struct intel_encoder *encoder;
 249         struct intel_crtc *crtc;
 250         struct intel_digital_port *dig_port;
 251         int ret = 0;
 252
 253         *source = INTEL_PIPE_CRC_SOURCE_PIPE;
 254
 255         drm_modeset_lock_all(dev);
 256         for_each_intel_encoder(dev, encoder) {
 257                 if (!encoder->base.crtc)
 258                         continue;
 259
 260                 crtc = to_intel_crtc(encoder->base.crtc);
 261
 262                 if (crtc->pipe != pipe)
 263                         continue;
 264
 265                 switch (encoder->type) {
 266                 case INTEL_OUTPUT_TVOUT:
 267                         *source = INTEL_PIPE_CRC_SOURCE_TV;
 268                         break;
 269                 case INTEL_OUTPUT_DP:
 270                 case INTEL_OUTPUT_EDP:
 271                         dig_port = enc_to_dig_port(&encoder->base);
 272                         switch (dig_port->base.port) {
 273                         case PORT_B:
 274                                 *source = INTEL_PIPE_CRC_SOURCE_DP_B;
 275                                 break;
 276                         case PORT_C:
 277                                 *source = INTEL_PIPE_CRC_SOURCE_DP_C;
 278                                 break;
 279                         case PORT_D:
 280                                 *source = INTEL_PIPE_CRC_SOURCE_DP_D;
 281                                 break;
 282                         default:
 283                                 WARN(1, "nonexisting DP port %c\n",
 284                                      port_name(dig_port->base.port));
 285                                 break;
 286                         }
 287                         break;
 288                 default:
 289                         break;
 290                 }
 291         }
 292         drm_modeset_unlock_all(dev);
 293
 294         return ret;
 295 }
 296
 297 static int vlv_pipe_crc_ctl_reg(struct drm_i915_private *dev_priv,
 298                                 enum pipe pipe,
 299                                 enum intel_pipe_crc_source *source,
 300                                 uint32_t *val)
 301 {
 302         bool need_stable_symbols = false;
 303
 304         if (*source == INTEL_PIPE_CRC_SOURCE_AUTO) {
 305                 int ret = i9xx_pipe_crc_auto_source(dev_priv, pipe, source);
 306                 if (ret)
 307                         return ret;
 308         }
 309
 310         switch (*source) {
 311         case INTEL_PIPE_CRC_SOURCE_PIPE:
 312                 *val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_PIPE_VLV;
 313                 break;
 314         case INTEL_PIPE_CRC_SOURCE_DP_B:
 315                 *val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_DP_B_VLV;
 316                 need_stable_symbols = true;
 317                 break;
 318         case INTEL_PIPE_CRC_SOURCE_DP_C:
 319                 *val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_DP_C_VLV;
 320                 need_stable_symbols = true;
 321                 break;
 322         case INTEL_PIPE_CRC_SOURCE_DP_D:
 323                 if (!IS_CHERRYVIEW(dev_priv))
 324                         return -EINVAL;
 325                 *val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_DP_D_VLV;
 326                 need_stable_symbols = true;
 327                 break;
 328         case INTEL_PIPE_CRC_SOURCE_NONE:
 329                 *val = 0;
 330                 break;
 331         default:
 332                 return -EINVAL;
 333         }
 334
 335         /*
 336          * When the pipe CRC tap point is after the transcoders we need
 337          * to tweak symbol-level features to produce a deterministic series of
 338          * symbols for a given frame. We need to reset those features only once
 339          * a frame (instead of every nth symbol):
 340          *   - DC-balance: used to ensure a better clock recovery from the data
 341          *     link (SDVO)
 342          *   - DisplayPort scrambling: used for EMI reduction
 343          */
 344         if (need_stable_symbols) {
 345                 uint32_t tmp = I915_READ(PORT_DFT2_G4X);
 346
 347                 tmp |= DC_BALANCE_RESET_VLV;
 348                 switch (pipe) {
 349                 case PIPE_A:
 350                         tmp |= PIPE_A_SCRAMBLE_RESET;
 351                         break;
 352                 case PIPE_B:
 353                         tmp |= PIPE_B_SCRAMBLE_RESET;
 354                         break;
 355                 case PIPE_C:
 356                         tmp |= PIPE_C_SCRAMBLE_RESET;
 357                         break;
 358                 default:
 359                         return -EINVAL;
 360                 }
 361                 I915_WRITE(PORT_DFT2_G4X, tmp);
 362         }
 363
 364         return 0;
 365 }
 366
 367 static int i9xx_pipe_crc_ctl_reg(struct drm_i915_private *dev_priv,
 368                                  enum pipe pipe,
 369                                  enum intel_pipe_crc_source *source,
 370                                  uint32_t *val)
 371 {
 372         bool need_stable_symbols = false;
 373
 374         if (*source == INTEL_PIPE_CRC_SOURCE_AUTO) {
 375                 int ret = i9xx_pipe_crc_auto_source(dev_priv, pipe, source);
 376                 if (ret)
 377                         return ret;
 378         }
 379
 380         switch (*source) {
 381         case INTEL_PIPE_CRC_SOURCE_PIPE:
 382                 *val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_PIPE_I9XX;
 383                 break;
 384         case INTEL_PIPE_CRC_SOURCE_TV:
 385                 if (!SUPPORTS_TV(dev_priv))
 386                         return -EINVAL;
 387                 *val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_TV_PRE;
 388                 break;
 389         case INTEL_PIPE_CRC_SOURCE_DP_B:
 390                 if (!IS_G4X(dev_priv))
 391                         return -EINVAL;
 392                 *val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_DP_B_G4X;
 393                 need_stable_symbols = true;
 394                 break;
 395         case INTEL_PIPE_CRC_SOURCE_DP_C:
 396                 if (!IS_G4X(dev_priv))
 397                         return -EINVAL;
 398                 *val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_DP_C_G4X;
 399                 need_stable_symbols = true;
 400                 break;
 401         case INTEL_PIPE_CRC_SOURCE_DP_D:
 402                 if (!IS_G4X(dev_priv))
 403                         return -EINVAL;
 404                 *val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_DP_D_G4X;
 405                 need_stable_symbols = true;
 406                 break;
 407         case INTEL_PIPE_CRC_SOURCE_NONE:
 408                 *val = 0;
 409                 break;
 410         default:
 411                 return -EINVAL;
 412         }
 413
 414         /*
 415          * When the pipe CRC tap point is after the transcoders we need
 416          * to tweak symbol-level features to produce a deterministic series of
 417          * symbols for a given frame. We need to reset those features only once
 418          * a frame (instead of every nth symbol):
 419          *   - DC-balance: used to ensure a better clock recovery from the data
 420          *     link (SDVO)
 421          *   - DisplayPort scrambling: used for EMI reduction
 422          */
 423         if (need_stable_symbols) {
 424                 uint32_t tmp = I915_READ(PORT_DFT2_G4X);
 425
 426                 WARN_ON(!IS_G4X(dev_priv));
 427
 428                 I915_WRITE(PORT_DFT_I9XX,
 429                            I915_READ(PORT_DFT_I9XX) | DC_BALANCE_RESET);
 430
 431                 if (pipe == PIPE_A)
 432                         tmp |= PIPE_A_SCRAMBLE_RESET;
 433                 else
 434                         tmp |= PIPE_B_SCRAMBLE_RESET;
 435
 436                 I915_WRITE(PORT_DFT2_G4X, tmp);
 437         }
 438
 439         return 0;
 440 }
 441
 442 static void vlv_undo_pipe_scramble_reset(struct drm_i915_private *dev_priv,
 443                                          enum pipe pipe)
 444 {
 445         uint32_t tmp = I915_READ(PORT_DFT2_G4X);
 446
 447         switch (pipe) {
 448         case PIPE_A:
 449                 tmp &= ~PIPE_A_SCRAMBLE_RESET;
 450                 break;
 451         case PIPE_B:
 452                 tmp &= ~PIPE_B_SCRAMBLE_RESET;
 453                 break;
 454         case PIPE_C:
 455                 tmp &= ~PIPE_C_SCRAMBLE_RESET;
 456                 break;
 457         default:
 458                 return;
 459         }
 460         if (!(tmp & PIPE_SCRAMBLE_RESET_MASK))
 461                 tmp &= ~DC_BALANCE_RESET_VLV;
 462         I915_WRITE(PORT_DFT2_G4X, tmp);
 463
 464 }
 465
 466 static void g4x_undo_pipe_scramble_reset(struct drm_i915_private *dev_priv,
 467                                          enum pipe pipe)
 468 {
 469         uint32_t tmp = I915_READ(PORT_DFT2_G4X);
 470
 471         if (pipe == PIPE_A)
 472                 tmp &= ~PIPE_A_SCRAMBLE_RESET;
 473         else
 474                 tmp &= ~PIPE_B_SCRAMBLE_RESET;
 475         I915_WRITE(PORT_DFT2_G4X, tmp);
 476
 477         if (!(tmp & PIPE_SCRAMBLE_RESET_MASK)) {
 478                 I915_WRITE(PORT_DFT_I9XX,
 479                            I915_READ(PORT_DFT_I9XX) & ~DC_BALANCE_RESET);
 480         }
 481 }
 482
 483 static int ilk_pipe_crc_ctl_reg(enum intel_pipe_crc_source *source,
 484                                 uint32_t *val)
 485 {
 486         if (*source == INTEL_PIPE_CRC_SOURCE_AUTO)
 487                 *source = INTEL_PIPE_CRC_SOURCE_PIPE;
 488
 489         switch (*source) {
 490         case INTEL_PIPE_CRC_SOURCE_PLANE1:
 491                 *val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_PRIMARY_ILK;
 492                 break;
 493         case INTEL_PIPE_CRC_SOURCE_PLANE2:
 494                 *val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_SPRITE_ILK;
 495                 break;
 496         case INTEL_PIPE_CRC_SOURCE_PIPE:
 497                 *val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_PIPE_ILK;
 498                 break;
 499         case INTEL_PIPE_CRC_SOURCE_NONE:
 500                 *val = 0;
 501                 break;
 502         default:
 503                 return -EINVAL;
 504         }
 505
 506         return 0;
 507 }
 508
 509 static void hsw_pipe_A_crc_wa(struct drm_i915_private *dev_priv,
 510                               bool enable)
 511 {
 512         struct drm_device *dev = &dev_priv->drm;
 513         struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv, PIPE_A);
 514         struct intel_crtc_state *pipe_config;
 515         struct drm_atomic_state *state;
 516         struct drm_modeset_acquire_ctx ctx;
 517         int ret = 0;
 518
 519         drm_modeset_acquire_init(&ctx, 0);
 520
 521         state = drm_atomic_state_alloc(dev);
 522         if (!state) {
 523                 ret = -ENOMEM;
 524                 goto unlock;
 525         }
 526
 527         state->acquire_ctx = &ctx;
 528
 529 retry:
 530         pipe_config = intel_atomic_get_crtc_state(state, crtc);
 531         if (IS_ERR(pipe_config)) {
 532                 ret = PTR_ERR(pipe_config);
 533                 goto put_state;
 534         }
 535
 536         if (HAS_IPS(dev_priv)) {
 537                 /*
 538                  * When IPS gets enabled, the pipe CRC changes. Since IPS gets
 539                  * enabled and disabled dynamically based on package C states,
 540                  * user space can't make reliable use of the CRCs, so let's just
 541                  * completely disable it.
 542                  */
 543                 pipe_config->ips_force_disable = enable;
 544         }
 545
 546         if (IS_HASWELL(dev_priv)) {
 547                 pipe_config->pch_pfit.force_thru = enable;
 548                 if (pipe_config->cpu_transcoder == TRANSCODER_EDP &&
 549                     pipe_config->pch_pfit.enabled != enable)
 550                         pipe_config->base.connectors_changed = true;
 551         }
 552
 553         ret = drm_atomic_commit(state);
 554
 555 put_state:
 556         if (ret == -EDEADLK) {
 557                 drm_atomic_state_clear(state);
 558                 drm_modeset_backoff(&ctx);
 559                 goto retry;
 560         }
 561
 562         drm_atomic_state_put(state);
 563 unlock:
 564         WARN(ret, "Toggling workaround to %i returns %i\n", enable, ret);
 565         drm_modeset_drop_locks(&ctx);
 566         drm_modeset_acquire_fini(&ctx);
 567 }
 568
 569 static int ivb_pipe_crc_ctl_reg(struct drm_i915_private *dev_priv,
 570                                 enum pipe pipe,
 571                                 enum intel_pipe_crc_source *source,
 572                                 uint32_t *val)
 573 {
 574         if (*source == INTEL_PIPE_CRC_SOURCE_AUTO)
 575                 *source = INTEL_PIPE_CRC_SOURCE_PF;
 576
 577         switch (*source) {
 578         case INTEL_PIPE_CRC_SOURCE_PLANE1:
 579                 *val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_PRIMARY_IVB;
 580                 break;
 581         case INTEL_PIPE_CRC_SOURCE_PLANE2:
 582                 *val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_SPRITE_IVB;
 583                 break;
 584         case INTEL_PIPE_CRC_SOURCE_PF:
 585                 if ((IS_HASWELL(dev_priv) ||
 586                      IS_BROADWELL(dev_priv)) && pipe == PIPE_A)
 587                         hsw_pipe_A_crc_wa(dev_priv, true);
 588
 589                 *val = PIPE_CRC_ENABLE | PIPE_CRC_SOURCE_PF_IVB;
 590                 break;
 591         case INTEL_PIPE_CRC_SOURCE_NONE:
 592                 *val = 0;
 593                 break;
 594         default:
 595                 return -EINVAL;
 596         }
 597
 598         return 0;
 599 }
 600
 601 static int get_new_crc_ctl_reg(struct drm_i915_private *dev_priv,
 602                                enum pipe pipe,
 603                                enum intel_pipe_crc_source *source, u32 *val)
 604 {
 605         if (IS_GEN2(dev_priv))
 606                 return i8xx_pipe_crc_ctl_reg(source, val);
 607         else if (INTEL_GEN(dev_priv) < 5)
 608                 return i9xx_pipe_crc_ctl_reg(dev_priv, pipe, source, val);
 609         else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 610                 return vlv_pipe_crc_ctl_reg(dev_priv, pipe, source, val);
 611         else if (IS_GEN5(dev_priv) || IS_GEN6(dev_priv))
 612                 return ilk_pipe_crc_ctl_reg(source, val);
 613         else
 614                 return ivb_pipe_crc_ctl_reg(dev_priv, pipe, source, val);
 615 }
 616
 617 static int pipe_crc_set_source(struct drm_i915_private *dev_priv,
 618                                enum pipe pipe,
 619                                enum intel_pipe_crc_source source)
 620 {
 621         struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[pipe];
 622         enum intel_display_power_domain power_domain;
 623         u32 val = 0; /* shut up gcc */
 624         int ret;
 625
 626         if (pipe_crc->source == source)
 627                 return 0;
 628
 629         /* forbid changing the source without going back to 'none' */
 630         if (pipe_crc->source && source)
 631                 return -EINVAL;
 632
 633         power_domain = POWER_DOMAIN_PIPE(pipe);
 634         if (!intel_display_power_get_if_enabled(dev_priv, power_domain)) {
 635                 DRM_DEBUG_KMS("Trying to capture CRC while pipe is off\n");
 636                 return -EIO;
 637         }
 638
 639         ret = get_new_crc_ctl_reg(dev_priv, pipe, &source, &val);
 640         if (ret != 0)
 641                 goto out;
 642
 643         /* none -> real source transition */
 644         if (source) {
 645                 struct intel_pipe_crc_entry *entries;
 646
 647                 DRM_DEBUG_DRIVER("collecting CRCs for pipe %c, %s\n",
 648                                  pipe_name(pipe), pipe_crc_source_name(source));
 649
 650                 entries = kcalloc(INTEL_PIPE_CRC_ENTRIES_NR,
 651                                   sizeof(pipe_crc->entries[0]),
 652                                   GFP_KERNEL);
 653                 if (!entries) {
 654                         ret = -ENOMEM;
 655                         goto out;
 656                 }
 657
 658                 spin_lock_irq(&pipe_crc->lock);
 659                 kfree(pipe_crc->entries);
 660                 pipe_crc->entries = entries;
 661                 pipe_crc->head = 0;
 662                 pipe_crc->tail = 0;
 663                 spin_unlock_irq(&pipe_crc->lock);
 664         }
 665
 666         pipe_crc->source = source;
 667
 668         I915_WRITE(PIPE_CRC_CTL(pipe), val);
 669         POSTING_READ(PIPE_CRC_CTL(pipe));
 670
 671         /* real source -> none transition */
 672         if (!source) {
 673                 struct intel_pipe_crc_entry *entries;
 674                 struct intel_crtc *crtc = intel_get_crtc_for_pipe(dev_priv,
 675                                                                   pipe);
 676
 677                 DRM_DEBUG_DRIVER("stopping CRCs for pipe %c\n",
 678                                  pipe_name(pipe));
 679
 680                 drm_modeset_lock(&crtc->base.mutex, NULL);
 681                 if (crtc->base.state->active)
 682                         intel_wait_for_vblank(dev_priv, pipe);
 683                 drm_modeset_unlock(&crtc->base.mutex);
 684
 685                 spin_lock_irq(&pipe_crc->lock);
 686                 entries = pipe_crc->entries;
 687                 pipe_crc->entries = NULL;
 688                 pipe_crc->head = 0;
 689                 pipe_crc->tail = 0;
 690                 spin_unlock_irq(&pipe_crc->lock);
 691
 692                 kfree(entries);
 693
 694                 if (IS_G4X(dev_priv))
 695                         g4x_undo_pipe_scramble_reset(dev_priv, pipe);
 696                 else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 697                         vlv_undo_pipe_scramble_reset(dev_priv, pipe);
 698                 else if ((IS_HASWELL(dev_priv) ||
 699                           IS_BROADWELL(dev_priv)) && pipe == PIPE_A)
 700                         hsw_pipe_A_crc_wa(dev_priv, false);
 701         }
 702
 703         ret = 0;
 704
 705 out:
 706         intel_display_power_put(dev_priv, power_domain);
 707
 708         return ret;
 709 }
 710
 711 /*
 712  * Parse pipe CRC command strings:
 713  *   command: wsp* object wsp+ name wsp+ source wsp*
 714  *   object: 'pipe'
 715  *   name: (A | B | C)
 716  *   source: (none | plane1 | plane2 | pf)
 717  *   wsp: (#0x20 | #0x9 | #0xA)+
 718  *
 719  * eg.:
 720  *  "pipe A plane1"  ->  Start CRC computations on plane1 of pipe A
 721  *  "pipe A none"    ->  Stop CRC
 722  */
 723 static int display_crc_ctl_tokenize(char *buf, char *words[], int max_words)
 724 {
 725         int n_words = 0;
 726
 727         while (*buf) {
 728                 char *end;
 729
 730                 /* skip leading white space */
 731                 buf = skip_spaces(buf);
 732                 if (!*buf)
 733                         break;  /* end of buffer */
 734
 735                 /* find end of word */
 736                 for (end = buf; *end && !isspace(*end); end++)
 737                         ;
 738
 739                 if (n_words == max_words) {
 740                         DRM_DEBUG_DRIVER("too many words, allowed <= %d\n",
 741                                          max_words);
 742                         return -EINVAL; /* ran out of words[] before bytes */
 743                 }
 744
 745                 if (*end)
 746                         *end++ = '\0';
 747                 words[n_words++] = buf;
 748                 buf = end;
 749         }
 750
 751         return n_words;
 752 }
 753
 754 enum intel_pipe_crc_object {
 755         PIPE_CRC_OBJECT_PIPE,
 756 };
 757
 758 static const char * const pipe_crc_objects[] = {
 759         "pipe",
 760 };
 761
 762 static int
 763 display_crc_ctl_parse_object(const char *buf, enum intel_pipe_crc_object *o)
 764 {
 765         int i;
 766
 767         for (i = 0; i < ARRAY_SIZE(pipe_crc_objects); i++)
 768                 if (!strcmp(buf, pipe_crc_objects[i])) {
 769                         *o = i;
 770                         return 0;
 771                 }
 772
 773         return -EINVAL;
 774 }
 775
 776 static int display_crc_ctl_parse_pipe(struct drm_i915_private *dev_priv,
 777                                       const char *buf, enum pipe *pipe)
 778 {
 779         const char name = buf[0];
 780
 781         if (name < 'A' || name >= pipe_name(INTEL_INFO(dev_priv)->num_pipes))
 782                 return -EINVAL;
 783
 784         *pipe = name - 'A';
 785
 786         return 0;
 787 }
 788
 789 static int
 790 display_crc_ctl_parse_source(const char *buf, enum intel_pipe_crc_source *s)
 791 {
 792         int i;
 793
 794         if (!buf) {
 795                 *s = INTEL_PIPE_CRC_SOURCE_NONE;
 796                 return 0;
 797         }
 798
 799         for (i = 0; i < ARRAY_SIZE(pipe_crc_sources); i++)
 800                 if (!strcmp(buf, pipe_crc_sources[i])) {
 801                         *s = i;
 802                         return 0;
 803                 }
 804
 805         return -EINVAL;
 806 }
 807
 808 static int display_crc_ctl_parse(struct drm_i915_private *dev_priv,
 809                                  char *buf, size_t len)
 810 {
 811 #define N_WORDS 3
 812         int n_words;
 813         char *words[N_WORDS];
 814         enum pipe pipe;
 815         enum intel_pipe_crc_object object;
 816         enum intel_pipe_crc_source source;
 817
 818         n_words = display_crc_ctl_tokenize(buf, words, N_WORDS);
 819         if (n_words != N_WORDS) {
 820                 DRM_DEBUG_DRIVER("tokenize failed, a command is %d words\n",
 821                                  N_WORDS);
 822                 return -EINVAL;
 823         }
 824
 825         if (display_crc_ctl_parse_object(words[0], &object) < 0) {
 826                 DRM_DEBUG_DRIVER("unknown object %s\n", words[0]);
 827                 return -EINVAL;
 828         }
 829
 830         if (display_crc_ctl_parse_pipe(dev_priv, words[1], &pipe) < 0) {
 831                 DRM_DEBUG_DRIVER("unknown pipe %s\n", words[1]);
 832                 return -EINVAL;
 833         }
 834
 835         if (display_crc_ctl_parse_source(words[2], &source) < 0) {
 836                 DRM_DEBUG_DRIVER("unknown source %s\n", words[2]);
 837                 return -EINVAL;
 838         }
 839
 840         return pipe_crc_set_source(dev_priv, pipe, source);
 841 }
 842
 843 static ssize_t display_crc_ctl_write(struct file *file, const char __user *ubuf,
 844                                      size_t len, loff_t *offp)
 845 {
 846         struct seq_file *m = file->private_data;
 847         struct drm_i915_private *dev_priv = m->private;
 848         char *tmpbuf;
 849         int ret;
 850
 851         if (len == 0)
 852                 return 0;
 853
 854         if (len > PAGE_SIZE - 1) {
 855                 DRM_DEBUG_DRIVER("expected <%lu bytes into pipe crc control\n",
 856                                  PAGE_SIZE);
 857                 return -E2BIG;
 858         }
 859
 860         tmpbuf = memdup_user_nul(ubuf, len);
 861         if (IS_ERR(tmpbuf))
 862                 return PTR_ERR(tmpbuf);
 863
 864         ret = display_crc_ctl_parse(dev_priv, tmpbuf, len);
 865
 866         kfree(tmpbuf);
 867         if (ret < 0)
 868                 return ret;
 869
 870         *offp += len;
 871         return len;
 872 }
 873
 874 const struct file_operations i915_display_crc_ctl_fops = {
 875         .owner = THIS_MODULE,
 876         .open = display_crc_ctl_open,
 877         .read = seq_read,
 878         .llseek = seq_lseek,
 879         .release = single_release,
 880         .write = display_crc_ctl_write
 881 };
 882
 883 void intel_display_crc_init(struct drm_i915_private *dev_priv)
 884 {
 885         enum pipe pipe;
 886
 887         for_each_pipe(dev_priv, pipe) {
 888                 struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[pipe];
 889
 890                 pipe_crc->opened = false;
 891                 spin_lock_init(&pipe_crc->lock);
 892                 init_waitqueue_head(&pipe_crc->wq);
 893         }
 894 }
 895
 896 int intel_pipe_crc_create(struct drm_minor *minor)
 897 {
 898         struct drm_i915_private *dev_priv = to_i915(minor->dev);
 899         struct dentry *ent;
 900         int i;
 901
 902         for (i = 0; i < ARRAY_SIZE(i915_pipe_crc_data); i++) {
 903                 struct pipe_crc_info *info = &i915_pipe_crc_data[i];
 904
 905                 info->dev_priv = dev_priv;
 906                 ent = debugfs_create_file(info->name, S_IRUGO,
 907                                           minor->debugfs_root, info,
 908                                           &i915_pipe_crc_fops);
 909                 if (!ent)
 910                         return -ENOMEM;
 911         }
 912
 913         return 0;
 914 }
 915
 916 int intel_crtc_set_crc_source(struct drm_crtc *crtc, const char *source_name,
 917                               size_t *values_cnt)
 918 {
 919         struct drm_i915_private *dev_priv = crtc->dev->dev_private;
 920         struct intel_pipe_crc *pipe_crc = &dev_priv->pipe_crc[crtc->index];
 921         enum intel_display_power_domain power_domain;
 922         enum intel_pipe_crc_source source;
 923         u32 val = 0; /* shut up gcc */
 924         int ret = 0;
 925
 926         if (display_crc_ctl_parse_source(source_name, &source) < 0) {
 927                 DRM_DEBUG_DRIVER("unknown source %s\n", source_name);
 928                 return -EINVAL;
 929         }
 930
 931         power_domain = POWER_DOMAIN_PIPE(crtc->index);
 932         if (!intel_display_power_get_if_enabled(dev_priv, power_domain)) {
 933                 DRM_DEBUG_KMS("Trying to capture CRC while pipe is off\n");
 934                 return -EIO;
 935         }
 936
 937         ret = get_new_crc_ctl_reg(dev_priv, crtc->index, &source, &val);
 938         if (ret != 0)
 939                 goto out;
 940
 941         I915_WRITE(PIPE_CRC_CTL(crtc->index), val);
 942         POSTING_READ(PIPE_CRC_CTL(crtc->index));
 943
 944         if (!source) {
 945                 if (IS_G4X(dev_priv))
 946                         g4x_undo_pipe_scramble_reset(dev_priv, crtc->index);
 947                 else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 948                         vlv_undo_pipe_scramble_reset(dev_priv, crtc->index);
 949                 else if ((IS_HASWELL(dev_priv) ||
 950                           IS_BROADWELL(dev_priv)) && crtc->index == PIPE_A)
 951                         hsw_pipe_A_crc_wa(dev_priv, false);
 952         }
 953
 954         pipe_crc->skipped = 0;
 955         *values_cnt = 5;
 956
 957 out:
 958         intel_display_power_put(dev_priv, power_domain);
 959
 960         return ret;
 961 }