drivers/gpu/drm/i915/i915_sysfs.c

   1 /*
   2  * Copyright © 2012 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  * Authors:
  24  *    Ben Widawsky <ben@bwidawsk.net>
  25  *
  26  */
  27
  28 #include <linux/device.h>
  29 #include <linux/module.h>
  30 #include <linux/stat.h>
  31 #include <linux/sysfs.h>
  32 #include "intel_drv.h"
  33 #include "i915_drv.h"
  34
  35 #define dev_to_drm_minor(d) dev_get_drvdata((d))
  36
  37 #ifdef CONFIG_PM
  38 static u32 calc_residency(struct drm_device *dev,
  39                           i915_reg_t reg)
  40 {
  41         struct drm_i915_private *dev_priv = dev->dev_private;
  42         u64 raw_time; /* 32b value may overflow during fixed point math */
  43         u64 units = 128ULL, div = 100000ULL;
  44         u32 ret;
  45
  46         if (!intel_enable_rc6(dev))
  47                 return 0;
  48
  49         intel_runtime_pm_get(dev_priv);
  50
  51         /* On VLV and CHV, residency time is in CZ units rather than 1.28us */
  52         if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
  53                 units = 1;
  54                 div = dev_priv->czclk_freq;
  55
  56                 if (I915_READ(VLV_COUNTER_CONTROL) & VLV_COUNT_RANGE_HIGH)
  57                         units <<= 8;
  58         } else if (IS_BROXTON(dev)) {
  59                 units = 1;
  60                 div = 1200;             /* 833.33ns */
  61         }
  62
  63         raw_time = I915_READ(reg) * units;
  64         ret = DIV_ROUND_UP_ULL(raw_time, div);
  65
  66         intel_runtime_pm_put(dev_priv);
  67         return ret;
  68 }
  69
  70 static ssize_t
  71 show_rc6_mask(struct device *kdev, struct device_attribute *attr, char *buf)
  72 {
  73         struct drm_minor *dminor = dev_to_drm_minor(kdev);
  74         return snprintf(buf, PAGE_SIZE, "%x\n", intel_enable_rc6(dminor->dev));
  75 }
  76
  77 static ssize_t
  78 show_rc6_ms(struct device *kdev, struct device_attribute *attr, char *buf)
  79 {
  80         struct drm_minor *dminor = dev_get_drvdata(kdev);
  81         u32 rc6_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6);
  82         return snprintf(buf, PAGE_SIZE, "%u\n", rc6_residency);
  83 }
  84
  85 static ssize_t
  86 show_rc6p_ms(struct device *kdev, struct device_attribute *attr, char *buf)
  87 {
  88         struct drm_minor *dminor = dev_to_drm_minor(kdev);
  89         u32 rc6p_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6p);
  90         return snprintf(buf, PAGE_SIZE, "%u\n", rc6p_residency);
  91 }
  92
  93 static ssize_t
  94 show_rc6pp_ms(struct device *kdev, struct device_attribute *attr, char *buf)
  95 {
  96         struct drm_minor *dminor = dev_to_drm_minor(kdev);
  97         u32 rc6pp_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6pp);
  98         return snprintf(buf, PAGE_SIZE, "%u\n", rc6pp_residency);
  99 }
 100
 101 static ssize_t
 102 show_media_rc6_ms(struct device *kdev, struct device_attribute *attr, char *buf)
 103 {
 104         struct drm_minor *dminor = dev_get_drvdata(kdev);
 105         u32 rc6_residency = calc_residency(dminor->dev, VLV_GT_MEDIA_RC6);
 106         return snprintf(buf, PAGE_SIZE, "%u\n", rc6_residency);
 107 }
 108
 109 static DEVICE_ATTR(rc6_enable, S_IRUGO, show_rc6_mask, NULL);
 110 static DEVICE_ATTR(rc6_residency_ms, S_IRUGO, show_rc6_ms, NULL);
 111 static DEVICE_ATTR(rc6p_residency_ms, S_IRUGO, show_rc6p_ms, NULL);
 112 static DEVICE_ATTR(rc6pp_residency_ms, S_IRUGO, show_rc6pp_ms, NULL);
 113 static DEVICE_ATTR(media_rc6_residency_ms, S_IRUGO, show_media_rc6_ms, NULL);
 114
 115 static struct attribute *rc6_attrs[] = {
 116         &dev_attr_rc6_enable.attr,
 117         &dev_attr_rc6_residency_ms.attr,
 118         NULL
 119 };
 120
 121 static struct attribute_group rc6_attr_group = {
 122         .name = power_group_name,
 123         .attrs =  rc6_attrs
 124 };
 125
 126 static struct attribute *rc6p_attrs[] = {
 127         &dev_attr_rc6p_residency_ms.attr,
 128         &dev_attr_rc6pp_residency_ms.attr,
 129         NULL
 130 };
 131
 132 static struct attribute_group rc6p_attr_group = {
 133         .name = power_group_name,
 134         .attrs =  rc6p_attrs
 135 };
 136
 137 static struct attribute *media_rc6_attrs[] = {
 138         &dev_attr_media_rc6_residency_ms.attr,
 139         NULL
 140 };
 141
 142 static struct attribute_group media_rc6_attr_group = {
 143         .name = power_group_name,
 144         .attrs =  media_rc6_attrs
 145 };
 146 #endif
 147
 148 static int l3_access_valid(struct drm_device *dev, loff_t offset)
 149 {
 150         if (!HAS_L3_DPF(dev))
 151                 return -EPERM;
 152
 153         if (offset % 4 != 0)
 154                 return -EINVAL;
 155
 156         if (offset >= GEN7_L3LOG_SIZE)
 157                 return -ENXIO;
 158
 159         return 0;
 160 }
 161
 162 static ssize_t
 163 i915_l3_read(struct file *filp, struct kobject *kobj,
 164              struct bin_attribute *attr, char *buf,
 165              loff_t offset, size_t count)
 166 {
 167         struct device *dev = kobj_to_dev(kobj);
 168         struct drm_minor *dminor = dev_to_drm_minor(dev);
 169         struct drm_device *drm_dev = dminor->dev;
 170         struct drm_i915_private *dev_priv = drm_dev->dev_private;
 171         int slice = (int)(uintptr_t)attr->private;
 172         int ret;
 173
 174         count = round_down(count, 4);
 175
 176         ret = l3_access_valid(drm_dev, offset);
 177         if (ret)
 178                 return ret;
 179
 180         count = min_t(size_t, GEN7_L3LOG_SIZE - offset, count);
 181
 182         ret = i915_mutex_lock_interruptible(drm_dev);
 183         if (ret)
 184                 return ret;
 185
 186         if (dev_priv->l3_parity.remap_info[slice])
 187                 memcpy(buf,
 188                        dev_priv->l3_parity.remap_info[slice] + (offset/4),
 189                        count);
 190         else
 191                 memset(buf, 0, count);
 192
 193         mutex_unlock(&drm_dev->struct_mutex);
 194
 195         return count;
 196 }
 197
 198 static ssize_t
 199 i915_l3_write(struct file *filp, struct kobject *kobj,
 200               struct bin_attribute *attr, char *buf,
 201               loff_t offset, size_t count)
 202 {
 203         struct device *dev = kobj_to_dev(kobj);
 204         struct drm_minor *dminor = dev_to_drm_minor(dev);
 205         struct drm_device *drm_dev = dminor->dev;
 206         struct drm_i915_private *dev_priv = drm_dev->dev_private;
 207         struct intel_context *ctx;
 208         u32 *temp = NULL; /* Just here to make handling failures easy */
 209         int slice = (int)(uintptr_t)attr->private;
 210         int ret;
 211
 212         if (!HAS_HW_CONTEXTS(drm_dev))
 213                 return -ENXIO;
 214
 215         ret = l3_access_valid(drm_dev, offset);
 216         if (ret)
 217                 return ret;
 218
 219         ret = i915_mutex_lock_interruptible(drm_dev);
 220         if (ret)
 221                 return ret;
 222
 223         if (!dev_priv->l3_parity.remap_info[slice]) {
 224                 temp = kzalloc(GEN7_L3LOG_SIZE, GFP_KERNEL);
 225                 if (!temp) {
 226                         mutex_unlock(&drm_dev->struct_mutex);
 227                         return -ENOMEM;
 228                 }
 229         }
 230
 231         ret = i915_gpu_idle(drm_dev);
 232         if (ret) {
 233                 kfree(temp);
 234                 mutex_unlock(&drm_dev->struct_mutex);
 235                 return ret;
 236         }
 237
 238         /* TODO: Ideally we really want a GPU reset here to make sure errors
 239          * aren't propagated. Since I cannot find a stable way to reset the GPU
 240          * at this point it is left as a TODO.
 241         */
 242         if (temp)
 243                 dev_priv->l3_parity.remap_info[slice] = temp;
 244
 245         memcpy(dev_priv->l3_parity.remap_info[slice] + (offset/4), buf, count);
 246
 247         /* NB: We defer the remapping until we switch to the context */
 248         list_for_each_entry(ctx, &dev_priv->context_list, link)
 249                 ctx->remap_slice |= (1<<slice);
 250
 251         mutex_unlock(&drm_dev->struct_mutex);
 252
 253         return count;
 254 }
 255
 256 static struct bin_attribute dpf_attrs = {
 257         .attr = {.name = "l3_parity", .mode = (S_IRUSR | S_IWUSR)},
 258         .size = GEN7_L3LOG_SIZE,
 259         .read = i915_l3_read,
 260         .write = i915_l3_write,
 261         .mmap = NULL,
 262         .private = (void *)0
 263 };
 264
 265 static struct bin_attribute dpf_attrs_1 = {
 266         .attr = {.name = "l3_parity_slice_1", .mode = (S_IRUSR | S_IWUSR)},
 267         .size = GEN7_L3LOG_SIZE,
 268         .read = i915_l3_read,
 269         .write = i915_l3_write,
 270         .mmap = NULL,
 271         .private = (void *)1
 272 };
 273
 274 static ssize_t gt_act_freq_mhz_show(struct device *kdev,
 275                                     struct device_attribute *attr, char *buf)
 276 {
 277         struct drm_minor *minor = dev_to_drm_minor(kdev);
 278         struct drm_device *dev = minor->dev;
 279         struct drm_i915_private *dev_priv = dev->dev_private;
 280         int ret;
 281
 282         flush_delayed_work(&dev_priv->rps.delayed_resume_work);
 283
 284         intel_runtime_pm_get(dev_priv);
 285
 286         mutex_lock(&dev_priv->rps.hw_lock);
 287         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 288                 u32 freq;
 289                 freq = vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS);
 290                 ret = intel_gpu_freq(dev_priv, (freq >> 8) & 0xff);
 291         } else {
 292                 u32 rpstat = I915_READ(GEN6_RPSTAT1);
 293                 if (IS_GEN9(dev_priv))
 294                         ret = (rpstat & GEN9_CAGF_MASK) >> GEN9_CAGF_SHIFT;
 295                 else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
 296                         ret = (rpstat & HSW_CAGF_MASK) >> HSW_CAGF_SHIFT;
 297                 else
 298                         ret = (rpstat & GEN6_CAGF_MASK) >> GEN6_CAGF_SHIFT;
 299                 ret = intel_gpu_freq(dev_priv, ret);
 300         }
 301         mutex_unlock(&dev_priv->rps.hw_lock);
 302
 303         intel_runtime_pm_put(dev_priv);
 304
 305         return snprintf(buf, PAGE_SIZE, "%d\n", ret);
 306 }
 307
 308 static ssize_t gt_cur_freq_mhz_show(struct device *kdev,
 309                                     struct device_attribute *attr, char *buf)
 310 {
 311         struct drm_minor *minor = dev_to_drm_minor(kdev);
 312         struct drm_device *dev = minor->dev;
 313         struct drm_i915_private *dev_priv = dev->dev_private;
 314         int ret;
 315
 316         flush_delayed_work(&dev_priv->rps.delayed_resume_work);
 317
 318         intel_runtime_pm_get(dev_priv);
 319
 320         mutex_lock(&dev_priv->rps.hw_lock);
 321         ret = intel_gpu_freq(dev_priv, dev_priv->rps.cur_freq);
 322         mutex_unlock(&dev_priv->rps.hw_lock);
 323
 324         intel_runtime_pm_put(dev_priv);
 325
 326         return snprintf(buf, PAGE_SIZE, "%d\n", ret);
 327 }
 328
 329 static ssize_t vlv_rpe_freq_mhz_show(struct device *kdev,
 330                                      struct device_attribute *attr, char *buf)
 331 {
 332         struct drm_minor *minor = dev_to_drm_minor(kdev);
 333         struct drm_device *dev = minor->dev;
 334         struct drm_i915_private *dev_priv = dev->dev_private;
 335
 336         return snprintf(buf, PAGE_SIZE,
 337                         "%d\n",
 338                         intel_gpu_freq(dev_priv, dev_priv->rps.efficient_freq));
 339 }
 340
 341 static ssize_t gt_max_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 342 {
 343         struct drm_minor *minor = dev_to_drm_minor(kdev);
 344         struct drm_device *dev = minor->dev;
 345         struct drm_i915_private *dev_priv = dev->dev_private;
 346         int ret;
 347
 348         flush_delayed_work(&dev_priv->rps.delayed_resume_work);
 349
 350         mutex_lock(&dev_priv->rps.hw_lock);
 351         ret = intel_gpu_freq(dev_priv, dev_priv->rps.max_freq_softlimit);
 352         mutex_unlock(&dev_priv->rps.hw_lock);
 353
 354         return snprintf(buf, PAGE_SIZE, "%d\n", ret);
 355 }
 356
 357 static ssize_t gt_max_freq_mhz_store(struct device *kdev,
 358                                      struct device_attribute *attr,
 359                                      const char *buf, size_t count)
 360 {
 361         struct drm_minor *minor = dev_to_drm_minor(kdev);
 362         struct drm_device *dev = minor->dev;
 363         struct drm_i915_private *dev_priv = dev->dev_private;
 364         u32 val;
 365         ssize_t ret;
 366
 367         ret = kstrtou32(buf, 0, &val);
 368         if (ret)
 369                 return ret;
 370
 371         flush_delayed_work(&dev_priv->rps.delayed_resume_work);
 372
 373         intel_runtime_pm_get(dev_priv);
 374
 375         mutex_lock(&dev_priv->rps.hw_lock);
 376
 377         val = intel_freq_opcode(dev_priv, val);
 378
 379         if (val < dev_priv->rps.min_freq ||
 380             val > dev_priv->rps.max_freq ||
 381             val < dev_priv->rps.min_freq_softlimit) {
 382                 mutex_unlock(&dev_priv->rps.hw_lock);
 383                 intel_runtime_pm_put(dev_priv);
 384                 return -EINVAL;
 385         }
 386
 387         if (val > dev_priv->rps.rp0_freq)
 388                 DRM_DEBUG("User requested overclocking to %d\n",
 389                           intel_gpu_freq(dev_priv, val));
 390
 391         dev_priv->rps.max_freq_softlimit = val;
 392
 393         val = clamp_t(int, dev_priv->rps.cur_freq,
 394                       dev_priv->rps.min_freq_softlimit,
 395                       dev_priv->rps.max_freq_softlimit);
 396
 397         /* We still need *_set_rps to process the new max_delay and
 398          * update the interrupt limits and PMINTRMSK even though
 399          * frequency request may be unchanged. */
 400         intel_set_rps(dev, val);
 401
 402         mutex_unlock(&dev_priv->rps.hw_lock);
 403
 404         intel_runtime_pm_put(dev_priv);
 405
 406         return count;
 407 }
 408
 409 static ssize_t gt_min_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 410 {
 411         struct drm_minor *minor = dev_to_drm_minor(kdev);
 412         struct drm_device *dev = minor->dev;
 413         struct drm_i915_private *dev_priv = dev->dev_private;
 414         int ret;
 415
 416         flush_delayed_work(&dev_priv->rps.delayed_resume_work);
 417
 418         mutex_lock(&dev_priv->rps.hw_lock);
 419         ret = intel_gpu_freq(dev_priv, dev_priv->rps.min_freq_softlimit);
 420         mutex_unlock(&dev_priv->rps.hw_lock);
 421
 422         return snprintf(buf, PAGE_SIZE, "%d\n", ret);
 423 }
 424
 425 static ssize_t gt_min_freq_mhz_store(struct device *kdev,
 426                                      struct device_attribute *attr,
 427                                      const char *buf, size_t count)
 428 {
 429         struct drm_minor *minor = dev_to_drm_minor(kdev);
 430         struct drm_device *dev = minor->dev;
 431         struct drm_i915_private *dev_priv = dev->dev_private;
 432         u32 val;
 433         ssize_t ret;
 434
 435         ret = kstrtou32(buf, 0, &val);
 436         if (ret)
 437                 return ret;
 438
 439         flush_delayed_work(&dev_priv->rps.delayed_resume_work);
 440
 441         intel_runtime_pm_get(dev_priv);
 442
 443         mutex_lock(&dev_priv->rps.hw_lock);
 444
 445         val = intel_freq_opcode(dev_priv, val);
 446
 447         if (val < dev_priv->rps.min_freq ||
 448             val > dev_priv->rps.max_freq ||
 449             val > dev_priv->rps.max_freq_softlimit) {
 450                 mutex_unlock(&dev_priv->rps.hw_lock);
 451                 intel_runtime_pm_put(dev_priv);
 452                 return -EINVAL;
 453         }
 454
 455         dev_priv->rps.min_freq_softlimit = val;
 456
 457         val = clamp_t(int, dev_priv->rps.cur_freq,
 458                       dev_priv->rps.min_freq_softlimit,
 459                       dev_priv->rps.max_freq_softlimit);
 460
 461         /* We still need *_set_rps to process the new min_delay and
 462          * update the interrupt limits and PMINTRMSK even though
 463          * frequency request may be unchanged. */
 464         intel_set_rps(dev, val);
 465
 466         mutex_unlock(&dev_priv->rps.hw_lock);
 467
 468         intel_runtime_pm_put(dev_priv);
 469
 470         return count;
 471
 472 }
 473
 474 static DEVICE_ATTR(gt_act_freq_mhz, S_IRUGO, gt_act_freq_mhz_show, NULL);
 475 static DEVICE_ATTR(gt_cur_freq_mhz, S_IRUGO, gt_cur_freq_mhz_show, NULL);
 476 static DEVICE_ATTR(gt_max_freq_mhz, S_IRUGO | S_IWUSR, gt_max_freq_mhz_show, gt_max_freq_mhz_store);
 477 static DEVICE_ATTR(gt_min_freq_mhz, S_IRUGO | S_IWUSR, gt_min_freq_mhz_show, gt_min_freq_mhz_store);
 478
 479 static DEVICE_ATTR(vlv_rpe_freq_mhz, S_IRUGO, vlv_rpe_freq_mhz_show, NULL);
 480
 481 static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf);
 482 static DEVICE_ATTR(gt_RP0_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 483 static DEVICE_ATTR(gt_RP1_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 484 static DEVICE_ATTR(gt_RPn_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 485
 486 /* For now we have a static number of RP states */
 487 static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 488 {
 489         struct drm_minor *minor = dev_to_drm_minor(kdev);
 490         struct drm_device *dev = minor->dev;
 491         struct drm_i915_private *dev_priv = dev->dev_private;
 492         u32 val;
 493
 494         if (attr == &dev_attr_gt_RP0_freq_mhz)
 495                 val = intel_gpu_freq(dev_priv, dev_priv->rps.rp0_freq);
 496         else if (attr == &dev_attr_gt_RP1_freq_mhz)
 497                 val = intel_gpu_freq(dev_priv, dev_priv->rps.rp1_freq);
 498         else if (attr == &dev_attr_gt_RPn_freq_mhz)
 499                 val = intel_gpu_freq(dev_priv, dev_priv->rps.min_freq);
 500         else
 501                 BUG();
 502
 503         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 504 }
 505
 506 static const struct attribute *gen6_attrs[] = {
 507         &dev_attr_gt_act_freq_mhz.attr,
 508         &dev_attr_gt_cur_freq_mhz.attr,
 509         &dev_attr_gt_max_freq_mhz.attr,
 510         &dev_attr_gt_min_freq_mhz.attr,
 511         &dev_attr_gt_RP0_freq_mhz.attr,
 512         &dev_attr_gt_RP1_freq_mhz.attr,
 513         &dev_attr_gt_RPn_freq_mhz.attr,
 514         NULL,
 515 };
 516
 517 static const struct attribute *vlv_attrs[] = {
 518         &dev_attr_gt_act_freq_mhz.attr,
 519         &dev_attr_gt_cur_freq_mhz.attr,
 520         &dev_attr_gt_max_freq_mhz.attr,
 521         &dev_attr_gt_min_freq_mhz.attr,
 522         &dev_attr_gt_RP0_freq_mhz.attr,
 523         &dev_attr_gt_RP1_freq_mhz.attr,
 524         &dev_attr_gt_RPn_freq_mhz.attr,
 525         &dev_attr_vlv_rpe_freq_mhz.attr,
 526         NULL,
 527 };
 528
 529 static ssize_t error_state_read(struct file *filp, struct kobject *kobj,
 530                                 struct bin_attribute *attr, char *buf,
 531                                 loff_t off, size_t count)
 532 {
 533
 534         struct device *kdev = kobj_to_dev(kobj);
 535         struct drm_minor *minor = dev_to_drm_minor(kdev);
 536         struct drm_device *dev = minor->dev;
 537         struct i915_error_state_file_priv error_priv;
 538         struct drm_i915_error_state_buf error_str;
 539         ssize_t ret_count = 0;
 540         int ret;
 541
 542         memset(&error_priv, 0, sizeof(error_priv));
 543
 544         ret = i915_error_state_buf_init(&error_str, to_i915(dev), count, off);
 545         if (ret)
 546                 return ret;
 547
 548         error_priv.dev = dev;
 549         i915_error_state_get(dev, &error_priv);
 550
 551         ret = i915_error_state_to_str(&error_str, &error_priv);
 552         if (ret)
 553                 goto out;
 554
 555         ret_count = count < error_str.bytes ? count : error_str.bytes;
 556
 557         memcpy(buf, error_str.buf, ret_count);
 558 out:
 559         i915_error_state_put(&error_priv);
 560         i915_error_state_buf_release(&error_str);
 561
 562         return ret ?: ret_count;
 563 }
 564
 565 static ssize_t error_state_write(struct file *file, struct kobject *kobj,
 566                                  struct bin_attribute *attr, char *buf,
 567                                  loff_t off, size_t count)
 568 {
 569         struct device *kdev = kobj_to_dev(kobj);
 570         struct drm_minor *minor = dev_to_drm_minor(kdev);
 571         struct drm_device *dev = minor->dev;
 572         int ret;
 573
 574         DRM_DEBUG_DRIVER("Resetting error state\n");
 575
 576         ret = mutex_lock_interruptible(&dev->struct_mutex);
 577         if (ret)
 578                 return ret;
 579
 580         i915_destroy_error_state(dev);
 581         mutex_unlock(&dev->struct_mutex);
 582
 583         return count;
 584 }
 585
 586 static struct bin_attribute error_state_attr = {
 587         .attr.name = "error",
 588         .attr.mode = S_IRUSR | S_IWUSR,
 589         .size = 0,
 590         .read = error_state_read,
 591         .write = error_state_write,
 592 };
 593
 594 void i915_setup_sysfs(struct drm_device *dev)
 595 {
 596         int ret;
 597
 598 #ifdef CONFIG_PM
 599         if (HAS_RC6(dev)) {
 600                 ret = sysfs_merge_group(&dev->primary->kdev->kobj,
 601                                         &rc6_attr_group);
 602                 if (ret)
 603                         DRM_ERROR("RC6 residency sysfs setup failed\n");
 604         }
 605         if (HAS_RC6p(dev)) {
 606                 ret = sysfs_merge_group(&dev->primary->kdev->kobj,
 607                                         &rc6p_attr_group);
 608                 if (ret)
 609                         DRM_ERROR("RC6p residency sysfs setup failed\n");
 610         }
 611         if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
 612                 ret = sysfs_merge_group(&dev->primary->kdev->kobj,
 613                                         &media_rc6_attr_group);
 614                 if (ret)
 615                         DRM_ERROR("Media RC6 residency sysfs setup failed\n");
 616         }
 617 #endif
 618         if (HAS_L3_DPF(dev)) {
 619                 ret = device_create_bin_file(dev->primary->kdev, &dpf_attrs);
 620                 if (ret)
 621                         DRM_ERROR("l3 parity sysfs setup failed\n");
 622
 623                 if (NUM_L3_SLICES(dev) > 1) {
 624                         ret = device_create_bin_file(dev->primary->kdev,
 625                                                      &dpf_attrs_1);
 626                         if (ret)
 627                                 DRM_ERROR("l3 parity slice 1 setup failed\n");
 628                 }
 629         }
 630
 631         ret = 0;
 632         if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev))
 633                 ret = sysfs_create_files(&dev->primary->kdev->kobj, vlv_attrs);
 634         else if (INTEL_INFO(dev)->gen >= 6)
 635                 ret = sysfs_create_files(&dev->primary->kdev->kobj, gen6_attrs);
 636         if (ret)
 637                 DRM_ERROR("RPS sysfs setup failed\n");
 638
 639         ret = sysfs_create_bin_file(&dev->primary->kdev->kobj,
 640                                     &error_state_attr);
 641         if (ret)
 642                 DRM_ERROR("error_state sysfs setup failed\n");
 643 }
 644
 645 void i915_teardown_sysfs(struct drm_device *dev)
 646 {
 647         sysfs_remove_bin_file(&dev->primary->kdev->kobj, &error_state_attr);
 648         if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev))
 649                 sysfs_remove_files(&dev->primary->kdev->kobj, vlv_attrs);
 650         else
 651                 sysfs_remove_files(&dev->primary->kdev->kobj, gen6_attrs);
 652         device_remove_bin_file(dev->primary->kdev,  &dpf_attrs_1);
 653         device_remove_bin_file(dev->primary->kdev,  &dpf_attrs);
 654 #ifdef CONFIG_PM
 655         sysfs_unmerge_group(&dev->primary->kdev->kobj, &rc6_attr_group);
 656         sysfs_unmerge_group(&dev->primary->kdev->kobj, &rc6p_attr_group);
 657 #endif
 658 }