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 static inline struct drm_i915_private *kdev_minor_to_i915(struct device *kdev)
  36 {
  37         struct drm_minor *minor = dev_get_drvdata(kdev);
  38         return to_i915(minor->dev);
  39 }
  40
  41 #ifdef CONFIG_PM
  42 static u32 calc_residency(struct drm_i915_private *dev_priv,
  43                           i915_reg_t reg)
  44 {
  45         u64 raw_time; /* 32b value may overflow during fixed point math */
  46         u64 units = 128ULL, div = 100000ULL;
  47         u32 ret;
  48
  49         if (!intel_enable_rc6())
  50                 return 0;
  51
  52         intel_runtime_pm_get(dev_priv);
  53
  54         /* On VLV and CHV, residency time is in CZ units rather than 1.28us */
  55         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
  56                 units = 1;
  57                 div = dev_priv->czclk_freq;
  58
  59                 if (I915_READ(VLV_COUNTER_CONTROL) & VLV_COUNT_RANGE_HIGH)
  60                         units <<= 8;
  61         } else if (IS_BROXTON(dev_priv)) {
  62                 units = 1;
  63                 div = 1200;             /* 833.33ns */
  64         }
  65
  66         raw_time = I915_READ(reg) * units;
  67         ret = DIV_ROUND_UP_ULL(raw_time, div);
  68
  69         intel_runtime_pm_put(dev_priv);
  70         return ret;
  71 }
  72
  73 static ssize_t
  74 show_rc6_mask(struct device *kdev, struct device_attribute *attr, char *buf)
  75 {
  76         return snprintf(buf, PAGE_SIZE, "%x\n", intel_enable_rc6());
  77 }
  78
  79 static ssize_t
  80 show_rc6_ms(struct device *kdev, struct device_attribute *attr, char *buf)
  81 {
  82         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
  83         u32 rc6_residency = calc_residency(dev_priv, GEN6_GT_GFX_RC6);
  84         return snprintf(buf, PAGE_SIZE, "%u\n", rc6_residency);
  85 }
  86
  87 static ssize_t
  88 show_rc6p_ms(struct device *kdev, struct device_attribute *attr, char *buf)
  89 {
  90         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
  91         u32 rc6p_residency = calc_residency(dev_priv, GEN6_GT_GFX_RC6p);
  92         return snprintf(buf, PAGE_SIZE, "%u\n", rc6p_residency);
  93 }
  94
  95 static ssize_t
  96 show_rc6pp_ms(struct device *kdev, struct device_attribute *attr, char *buf)
  97 {
  98         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
  99         u32 rc6pp_residency = calc_residency(dev_priv, GEN6_GT_GFX_RC6pp);
 100         return snprintf(buf, PAGE_SIZE, "%u\n", rc6pp_residency);
 101 }
 102
 103 static ssize_t
 104 show_media_rc6_ms(struct device *kdev, struct device_attribute *attr, char *buf)
 105 {
 106         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 107         u32 rc6_residency = calc_residency(dev_priv, VLV_GT_MEDIA_RC6);
 108         return snprintf(buf, PAGE_SIZE, "%u\n", rc6_residency);
 109 }
 110
 111 static DEVICE_ATTR(rc6_enable, S_IRUGO, show_rc6_mask, NULL);
 112 static DEVICE_ATTR(rc6_residency_ms, S_IRUGO, show_rc6_ms, NULL);
 113 static DEVICE_ATTR(rc6p_residency_ms, S_IRUGO, show_rc6p_ms, NULL);
 114 static DEVICE_ATTR(rc6pp_residency_ms, S_IRUGO, show_rc6pp_ms, NULL);
 115 static DEVICE_ATTR(media_rc6_residency_ms, S_IRUGO, show_media_rc6_ms, NULL);
 116
 117 static struct attribute *rc6_attrs[] = {
 118         &dev_attr_rc6_enable.attr,
 119         &dev_attr_rc6_residency_ms.attr,
 120         NULL
 121 };
 122
 123 static struct attribute_group rc6_attr_group = {
 124         .name = power_group_name,
 125         .attrs =  rc6_attrs
 126 };
 127
 128 static struct attribute *rc6p_attrs[] = {
 129         &dev_attr_rc6p_residency_ms.attr,
 130         &dev_attr_rc6pp_residency_ms.attr,
 131         NULL
 132 };
 133
 134 static struct attribute_group rc6p_attr_group = {
 135         .name = power_group_name,
 136         .attrs =  rc6p_attrs
 137 };
 138
 139 static struct attribute *media_rc6_attrs[] = {
 140         &dev_attr_media_rc6_residency_ms.attr,
 141         NULL
 142 };
 143
 144 static struct attribute_group media_rc6_attr_group = {
 145         .name = power_group_name,
 146         .attrs =  media_rc6_attrs
 147 };
 148 #endif
 149
 150 static int l3_access_valid(struct drm_i915_private *dev_priv, loff_t offset)
 151 {
 152         if (!HAS_L3_DPF(dev_priv))
 153                 return -EPERM;
 154
 155         if (offset % 4 != 0)
 156                 return -EINVAL;
 157
 158         if (offset >= GEN7_L3LOG_SIZE)
 159                 return -ENXIO;
 160
 161         return 0;
 162 }
 163
 164 static ssize_t
 165 i915_l3_read(struct file *filp, struct kobject *kobj,
 166              struct bin_attribute *attr, char *buf,
 167              loff_t offset, size_t count)
 168 {
 169         struct device *kdev = kobj_to_dev(kobj);
 170         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 171         struct drm_device *dev = &dev_priv->drm;
 172         int slice = (int)(uintptr_t)attr->private;
 173         int ret;
 174
 175         count = round_down(count, 4);
 176
 177         ret = l3_access_valid(dev_priv, offset);
 178         if (ret)
 179                 return ret;
 180
 181         count = min_t(size_t, GEN7_L3LOG_SIZE - offset, count);
 182
 183         ret = i915_mutex_lock_interruptible(dev);
 184         if (ret)
 185                 return ret;
 186
 187         if (dev_priv->l3_parity.remap_info[slice])
 188                 memcpy(buf,
 189                        dev_priv->l3_parity.remap_info[slice] + (offset/4),
 190                        count);
 191         else
 192                 memset(buf, 0, count);
 193
 194         mutex_unlock(&dev->struct_mutex);
 195
 196         return count;
 197 }
 198
 199 static ssize_t
 200 i915_l3_write(struct file *filp, struct kobject *kobj,
 201               struct bin_attribute *attr, char *buf,
 202               loff_t offset, size_t count)
 203 {
 204         struct device *kdev = kobj_to_dev(kobj);
 205         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 206         struct drm_device *dev = &dev_priv->drm;
 207         struct i915_gem_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(dev_priv))
 213                 return -ENXIO;
 214
 215         ret = l3_access_valid(dev_priv, offset);
 216         if (ret)
 217                 return ret;
 218
 219         ret = i915_mutex_lock_interruptible(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(&dev->struct_mutex);
 227                         return -ENOMEM;
 228                 }
 229         }
 230
 231         /* TODO: Ideally we really want a GPU reset here to make sure errors
 232          * aren't propagated. Since I cannot find a stable way to reset the GPU
 233          * at this point it is left as a TODO.
 234         */
 235         if (temp)
 236                 dev_priv->l3_parity.remap_info[slice] = temp;
 237
 238         memcpy(dev_priv->l3_parity.remap_info[slice] + (offset/4), buf, count);
 239
 240         /* NB: We defer the remapping until we switch to the context */
 241         list_for_each_entry(ctx, &dev_priv->context_list, link)
 242                 ctx->remap_slice |= (1<<slice);
 243
 244         mutex_unlock(&dev->struct_mutex);
 245
 246         return count;
 247 }
 248
 249 static struct bin_attribute dpf_attrs = {
 250         .attr = {.name = "l3_parity", .mode = (S_IRUSR | S_IWUSR)},
 251         .size = GEN7_L3LOG_SIZE,
 252         .read = i915_l3_read,
 253         .write = i915_l3_write,
 254         .mmap = NULL,
 255         .private = (void *)0
 256 };
 257
 258 static struct bin_attribute dpf_attrs_1 = {
 259         .attr = {.name = "l3_parity_slice_1", .mode = (S_IRUSR | S_IWUSR)},
 260         .size = GEN7_L3LOG_SIZE,
 261         .read = i915_l3_read,
 262         .write = i915_l3_write,
 263         .mmap = NULL,
 264         .private = (void *)1
 265 };
 266
 267 static ssize_t gt_act_freq_mhz_show(struct device *kdev,
 268                                     struct device_attribute *attr, char *buf)
 269 {
 270         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 271         int ret;
 272
 273         intel_runtime_pm_get(dev_priv);
 274
 275         mutex_lock(&dev_priv->rps.hw_lock);
 276         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 277                 u32 freq;
 278                 freq = vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS);
 279                 ret = intel_gpu_freq(dev_priv, (freq >> 8) & 0xff);
 280         } else {
 281                 u32 rpstat = I915_READ(GEN6_RPSTAT1);
 282                 if (IS_GEN9(dev_priv))
 283                         ret = (rpstat & GEN9_CAGF_MASK) >> GEN9_CAGF_SHIFT;
 284                 else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
 285                         ret = (rpstat & HSW_CAGF_MASK) >> HSW_CAGF_SHIFT;
 286                 else
 287                         ret = (rpstat & GEN6_CAGF_MASK) >> GEN6_CAGF_SHIFT;
 288                 ret = intel_gpu_freq(dev_priv, ret);
 289         }
 290         mutex_unlock(&dev_priv->rps.hw_lock);
 291
 292         intel_runtime_pm_put(dev_priv);
 293
 294         return snprintf(buf, PAGE_SIZE, "%d\n", ret);
 295 }
 296
 297 static ssize_t gt_cur_freq_mhz_show(struct device *kdev,
 298                                     struct device_attribute *attr, char *buf)
 299 {
 300         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 301
 302         return snprintf(buf, PAGE_SIZE, "%d\n",
 303                         intel_gpu_freq(dev_priv,
 304                                        dev_priv->rps.cur_freq));
 305 }
 306
 307 static ssize_t gt_boost_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 308 {
 309         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 310
 311         return snprintf(buf, PAGE_SIZE, "%d\n",
 312                         intel_gpu_freq(dev_priv,
 313                                        dev_priv->rps.boost_freq));
 314 }
 315
 316 static ssize_t gt_boost_freq_mhz_store(struct device *kdev,
 317                                        struct device_attribute *attr,
 318                                        const char *buf, size_t count)
 319 {
 320         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 321         u32 val;
 322         ssize_t ret;
 323
 324         ret = kstrtou32(buf, 0, &val);
 325         if (ret)
 326                 return ret;
 327
 328         /* Validate against (static) hardware limits */
 329         val = intel_freq_opcode(dev_priv, val);
 330         if (val < dev_priv->rps.min_freq || val > dev_priv->rps.max_freq)
 331                 return -EINVAL;
 332
 333         mutex_lock(&dev_priv->rps.hw_lock);
 334         dev_priv->rps.boost_freq = val;
 335         mutex_unlock(&dev_priv->rps.hw_lock);
 336
 337         return count;
 338 }
 339
 340 static ssize_t vlv_rpe_freq_mhz_show(struct device *kdev,
 341                                      struct device_attribute *attr, char *buf)
 342 {
 343         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 344
 345         return snprintf(buf, PAGE_SIZE, "%d\n",
 346                         intel_gpu_freq(dev_priv,
 347                                        dev_priv->rps.efficient_freq));
 348 }
 349
 350 static ssize_t gt_max_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 351 {
 352         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 353
 354         return snprintf(buf, PAGE_SIZE, "%d\n",
 355                         intel_gpu_freq(dev_priv,
 356                                        dev_priv->rps.max_freq_softlimit));
 357 }
 358
 359 static ssize_t gt_max_freq_mhz_store(struct device *kdev,
 360                                      struct device_attribute *attr,
 361                                      const char *buf, size_t count)
 362 {
 363         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 364         u32 val;
 365         ssize_t ret;
 366
 367         ret = kstrtou32(buf, 0, &val);
 368         if (ret)
 369                 return ret;
 370
 371         intel_runtime_pm_get(dev_priv);
 372
 373         mutex_lock(&dev_priv->rps.hw_lock);
 374
 375         val = intel_freq_opcode(dev_priv, val);
 376
 377         if (val < dev_priv->rps.min_freq ||
 378             val > dev_priv->rps.max_freq ||
 379             val < dev_priv->rps.min_freq_softlimit) {
 380                 mutex_unlock(&dev_priv->rps.hw_lock);
 381                 intel_runtime_pm_put(dev_priv);
 382                 return -EINVAL;
 383         }
 384
 385         if (val > dev_priv->rps.rp0_freq)
 386                 DRM_DEBUG("User requested overclocking to %d\n",
 387                           intel_gpu_freq(dev_priv, val));
 388
 389         dev_priv->rps.max_freq_softlimit = val;
 390
 391         val = clamp_t(int, dev_priv->rps.cur_freq,
 392                       dev_priv->rps.min_freq_softlimit,
 393                       dev_priv->rps.max_freq_softlimit);
 394
 395         /* We still need *_set_rps to process the new max_delay and
 396          * update the interrupt limits and PMINTRMSK even though
 397          * frequency request may be unchanged. */
 398         intel_set_rps(dev_priv, val);
 399
 400         mutex_unlock(&dev_priv->rps.hw_lock);
 401
 402         intel_runtime_pm_put(dev_priv);
 403
 404         return count;
 405 }
 406
 407 static ssize_t gt_min_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 408 {
 409         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 410
 411         return snprintf(buf, PAGE_SIZE, "%d\n",
 412                         intel_gpu_freq(dev_priv,
 413                                        dev_priv->rps.min_freq_softlimit));
 414 }
 415
 416 static ssize_t gt_min_freq_mhz_store(struct device *kdev,
 417                                      struct device_attribute *attr,
 418                                      const char *buf, size_t count)
 419 {
 420         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 421         u32 val;
 422         ssize_t ret;
 423
 424         ret = kstrtou32(buf, 0, &val);
 425         if (ret)
 426                 return ret;
 427
 428         intel_runtime_pm_get(dev_priv);
 429
 430         mutex_lock(&dev_priv->rps.hw_lock);
 431
 432         val = intel_freq_opcode(dev_priv, val);
 433
 434         if (val < dev_priv->rps.min_freq ||
 435             val > dev_priv->rps.max_freq ||
 436             val > dev_priv->rps.max_freq_softlimit) {
 437                 mutex_unlock(&dev_priv->rps.hw_lock);
 438                 intel_runtime_pm_put(dev_priv);
 439                 return -EINVAL;
 440         }
 441
 442         dev_priv->rps.min_freq_softlimit = val;
 443
 444         val = clamp_t(int, dev_priv->rps.cur_freq,
 445                       dev_priv->rps.min_freq_softlimit,
 446                       dev_priv->rps.max_freq_softlimit);
 447
 448         /* We still need *_set_rps to process the new min_delay and
 449          * update the interrupt limits and PMINTRMSK even though
 450          * frequency request may be unchanged. */
 451         intel_set_rps(dev_priv, val);
 452
 453         mutex_unlock(&dev_priv->rps.hw_lock);
 454
 455         intel_runtime_pm_put(dev_priv);
 456
 457         return count;
 458
 459 }
 460
 461 static DEVICE_ATTR(gt_act_freq_mhz, S_IRUGO, gt_act_freq_mhz_show, NULL);
 462 static DEVICE_ATTR(gt_cur_freq_mhz, S_IRUGO, gt_cur_freq_mhz_show, NULL);
 463 static DEVICE_ATTR(gt_boost_freq_mhz, S_IRUGO | S_IWUSR, gt_boost_freq_mhz_show, gt_boost_freq_mhz_store);
 464 static DEVICE_ATTR(gt_max_freq_mhz, S_IRUGO | S_IWUSR, gt_max_freq_mhz_show, gt_max_freq_mhz_store);
 465 static DEVICE_ATTR(gt_min_freq_mhz, S_IRUGO | S_IWUSR, gt_min_freq_mhz_show, gt_min_freq_mhz_store);
 466
 467 static DEVICE_ATTR(vlv_rpe_freq_mhz, S_IRUGO, vlv_rpe_freq_mhz_show, NULL);
 468
 469 static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf);
 470 static DEVICE_ATTR(gt_RP0_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 471 static DEVICE_ATTR(gt_RP1_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 472 static DEVICE_ATTR(gt_RPn_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 473
 474 /* For now we have a static number of RP states */
 475 static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 476 {
 477         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 478         u32 val;
 479
 480         if (attr == &dev_attr_gt_RP0_freq_mhz)
 481                 val = intel_gpu_freq(dev_priv, dev_priv->rps.rp0_freq);
 482         else if (attr == &dev_attr_gt_RP1_freq_mhz)
 483                 val = intel_gpu_freq(dev_priv, dev_priv->rps.rp1_freq);
 484         else if (attr == &dev_attr_gt_RPn_freq_mhz)
 485                 val = intel_gpu_freq(dev_priv, dev_priv->rps.min_freq);
 486         else
 487                 BUG();
 488
 489         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 490 }
 491
 492 static const struct attribute *gen6_attrs[] = {
 493         &dev_attr_gt_act_freq_mhz.attr,
 494         &dev_attr_gt_cur_freq_mhz.attr,
 495         &dev_attr_gt_boost_freq_mhz.attr,
 496         &dev_attr_gt_max_freq_mhz.attr,
 497         &dev_attr_gt_min_freq_mhz.attr,
 498         &dev_attr_gt_RP0_freq_mhz.attr,
 499         &dev_attr_gt_RP1_freq_mhz.attr,
 500         &dev_attr_gt_RPn_freq_mhz.attr,
 501         NULL,
 502 };
 503
 504 static const struct attribute *vlv_attrs[] = {
 505         &dev_attr_gt_act_freq_mhz.attr,
 506         &dev_attr_gt_cur_freq_mhz.attr,
 507         &dev_attr_gt_boost_freq_mhz.attr,
 508         &dev_attr_gt_max_freq_mhz.attr,
 509         &dev_attr_gt_min_freq_mhz.attr,
 510         &dev_attr_gt_RP0_freq_mhz.attr,
 511         &dev_attr_gt_RP1_freq_mhz.attr,
 512         &dev_attr_gt_RPn_freq_mhz.attr,
 513         &dev_attr_vlv_rpe_freq_mhz.attr,
 514         NULL,
 515 };
 516
 517 static ssize_t error_state_read(struct file *filp, struct kobject *kobj,
 518                                 struct bin_attribute *attr, char *buf,
 519                                 loff_t off, size_t count)
 520 {
 521
 522         struct device *kdev = kobj_to_dev(kobj);
 523         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 524         struct drm_device *dev = &dev_priv->drm;
 525         struct i915_error_state_file_priv error_priv;
 526         struct drm_i915_error_state_buf error_str;
 527         ssize_t ret_count = 0;
 528         int ret;
 529
 530         memset(&error_priv, 0, sizeof(error_priv));
 531
 532         ret = i915_error_state_buf_init(&error_str, to_i915(dev), count, off);
 533         if (ret)
 534                 return ret;
 535
 536         error_priv.dev = dev;
 537         i915_error_state_get(dev, &error_priv);
 538
 539         ret = i915_error_state_to_str(&error_str, &error_priv);
 540         if (ret)
 541                 goto out;
 542
 543         ret_count = count < error_str.bytes ? count : error_str.bytes;
 544
 545         memcpy(buf, error_str.buf, ret_count);
 546 out:
 547         i915_error_state_put(&error_priv);
 548         i915_error_state_buf_release(&error_str);
 549
 550         return ret ?: ret_count;
 551 }
 552
 553 static ssize_t error_state_write(struct file *file, struct kobject *kobj,
 554                                  struct bin_attribute *attr, char *buf,
 555                                  loff_t off, size_t count)
 556 {
 557         struct device *kdev = kobj_to_dev(kobj);
 558         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
 559
 560         DRM_DEBUG_DRIVER("Resetting error state\n");
 561         i915_destroy_error_state(&dev_priv->drm);
 562
 563         return count;
 564 }
 565
 566 static struct bin_attribute error_state_attr = {
 567         .attr.name = "error",
 568         .attr.mode = S_IRUSR | S_IWUSR,
 569         .size = 0,
 570         .read = error_state_read,
 571         .write = error_state_write,
 572 };
 573
 574 void i915_setup_sysfs(struct drm_i915_private *dev_priv)
 575 {
 576         struct device *kdev = dev_priv->drm.primary->kdev;
 577         int ret;
 578
 579 #ifdef CONFIG_PM
 580         if (HAS_RC6(dev_priv)) {
 581                 ret = sysfs_merge_group(&kdev->kobj,
 582                                         &rc6_attr_group);
 583                 if (ret)
 584                         DRM_ERROR("RC6 residency sysfs setup failed\n");
 585         }
 586         if (HAS_RC6p(dev_priv)) {
 587                 ret = sysfs_merge_group(&kdev->kobj,
 588                                         &rc6p_attr_group);
 589                 if (ret)
 590                         DRM_ERROR("RC6p residency sysfs setup failed\n");
 591         }
 592         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 593                 ret = sysfs_merge_group(&kdev->kobj,
 594                                         &media_rc6_attr_group);
 595                 if (ret)
 596                         DRM_ERROR("Media RC6 residency sysfs setup failed\n");
 597         }
 598 #endif
 599         if (HAS_L3_DPF(dev_priv)) {
 600                 ret = device_create_bin_file(kdev, &dpf_attrs);
 601                 if (ret)
 602                         DRM_ERROR("l3 parity sysfs setup failed\n");
 603
 604                 if (NUM_L3_SLICES(dev_priv) > 1) {
 605                         ret = device_create_bin_file(kdev,
 606                                                      &dpf_attrs_1);
 607                         if (ret)
 608                                 DRM_ERROR("l3 parity slice 1 setup failed\n");
 609                 }
 610         }
 611
 612         ret = 0;
 613         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 614                 ret = sysfs_create_files(&kdev->kobj, vlv_attrs);
 615         else if (INTEL_GEN(dev_priv) >= 6)
 616                 ret = sysfs_create_files(&kdev->kobj, gen6_attrs);
 617         if (ret)
 618                 DRM_ERROR("RPS sysfs setup failed\n");
 619
 620         ret = sysfs_create_bin_file(&kdev->kobj,
 621                                     &error_state_attr);
 622         if (ret)
 623                 DRM_ERROR("error_state sysfs setup failed\n");
 624 }
 625
 626 void i915_teardown_sysfs(struct drm_i915_private *dev_priv)
 627 {
 628         struct device *kdev = dev_priv->drm.primary->kdev;
 629
 630         sysfs_remove_bin_file(&kdev->kobj, &error_state_attr);
 631         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
 632                 sysfs_remove_files(&kdev->kobj, vlv_attrs);
 633         else
 634                 sysfs_remove_files(&kdev->kobj, gen6_attrs);
 635         device_remove_bin_file(kdev,  &dpf_attrs_1);
 636         device_remove_bin_file(kdev,  &dpf_attrs);
 637 #ifdef CONFIG_PM
 638         sysfs_unmerge_group(&kdev->kobj, &rc6_attr_group);
 639         sysfs_unmerge_group(&kdev->kobj, &rc6p_attr_group);
 640 #endif
 641 }