sys/dev/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 <drm/drmP.h>
  29 #include <linux/device.h>
  30 #include <linux/module.h>
  31 #include "intel_drv.h"
  32 #include "i915_drv.h"
  33
  34 #if 0
  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 = to_i915(dev);
  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())
  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         return snprintf(buf, PAGE_SIZE, "%x\n", intel_enable_rc6());
  74 }
  75
  76 static ssize_t
  77 show_rc6_ms(struct device *kdev, struct device_attribute *attr, char *buf)
  78 {
  79         struct drm_minor *dminor = dev_get_drvdata(kdev);
  80         u32 rc6_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6);
  81         return snprintf(buf, PAGE_SIZE, "%u\n", rc6_residency);
  82 }
  83
  84 static ssize_t
  85 show_rc6p_ms(struct device *kdev, struct device_attribute *attr, char *buf)
  86 {
  87         struct drm_minor *dminor = dev_to_drm_minor(kdev);
  88         u32 rc6p_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6p);
  89         return snprintf(buf, PAGE_SIZE, "%u\n", rc6p_residency);
  90 }
  91
  92 static ssize_t
  93 show_rc6pp_ms(struct device *kdev, struct device_attribute *attr, char *buf)
  94 {
  95         struct drm_minor *dminor = dev_to_drm_minor(kdev);
  96         u32 rc6pp_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6pp);
  97         return snprintf(buf, PAGE_SIZE, "%u\n", rc6pp_residency);
  98 }
  99
 100 static ssize_t
 101 show_media_rc6_ms(struct device *kdev, struct device_attribute *attr, char *buf)
 102 {
 103         struct drm_minor *dminor = dev_get_drvdata(kdev);
 104         u32 rc6_residency = calc_residency(dminor->dev, VLV_GT_MEDIA_RC6);
 105         return snprintf(buf, PAGE_SIZE, "%u\n", rc6_residency);
 106 }
 107
 108 static DEVICE_ATTR(rc6_enable, S_IRUGO, show_rc6_mask, NULL);
 109 static DEVICE_ATTR(rc6_residency_ms, S_IRUGO, show_rc6_ms, NULL);
 110 static DEVICE_ATTR(rc6p_residency_ms, S_IRUGO, show_rc6p_ms, NULL);
 111 static DEVICE_ATTR(rc6pp_residency_ms, S_IRUGO, show_rc6pp_ms, NULL);
 112 static DEVICE_ATTR(media_rc6_residency_ms, S_IRUGO, show_media_rc6_ms, NULL);
 113
 114 static struct attribute *rc6_attrs[] = {
 115         &dev_attr_rc6_enable.attr,
 116         &dev_attr_rc6_residency_ms.attr,
 117         NULL
 118 };
 119
 120 static struct attribute_group rc6_attr_group = {
 121         .name = power_group_name,
 122         .attrs =  rc6_attrs
 123 };
 124
 125 static struct attribute *rc6p_attrs[] = {
 126         &dev_attr_rc6p_residency_ms.attr,
 127         &dev_attr_rc6pp_residency_ms.attr,
 128         NULL
 129 };
 130
 131 static struct attribute_group rc6p_attr_group = {
 132         .name = power_group_name,
 133         .attrs =  rc6p_attrs
 134 };
 135
 136 static struct attribute *media_rc6_attrs[] = {
 137         &dev_attr_media_rc6_residency_ms.attr,
 138         NULL
 139 };
 140
 141 static struct attribute_group media_rc6_attr_group = {
 142         .name = power_group_name,
 143         .attrs =  media_rc6_attrs
 144 };
 145 #endif
 146
 147 static int l3_access_valid(struct drm_device *dev, loff_t offset)
 148 {
 149         if (!HAS_L3_DPF(dev))
 150                 return -EPERM;
 151
 152         if (offset % 4 != 0)
 153                 return -EINVAL;
 154
 155         if (offset >= GEN7_L3LOG_SIZE)
 156                 return -ENXIO;
 157
 158         return 0;
 159 }
 160
 161 static ssize_t
 162 i915_l3_read(struct file *filp, struct kobject *kobj,
 163              struct bin_attribute *attr, char *buf,
 164              loff_t offset, size_t count)
 165 {
 166         struct device *dev = kobj_to_dev(kobj);
 167         struct drm_minor *dminor = dev_to_drm_minor(dev);
 168         struct drm_device *drm_dev = dminor->dev;
 169         struct drm_i915_private *dev_priv = to_i915(drm_dev);
 170         int slice = (int)(uintptr_t)attr->private;
 171         int ret;
 172
 173         count = round_down(count, 4);
 174
 175         ret = l3_access_valid(drm_dev, offset);
 176         if (ret)
 177                 return ret;
 178
 179         count = min_t(size_t, GEN7_L3LOG_SIZE - offset, count);
 180
 181         ret = i915_mutex_lock_interruptible(drm_dev);
 182         if (ret)
 183                 return ret;
 184
 185         if (dev_priv->l3_parity.remap_info[slice])
 186                 memcpy(buf,
 187                        dev_priv->l3_parity.remap_info[slice] + (offset/4),
 188                        count);
 189         else
 190                 memset(buf, 0, count);
 191
 192         mutex_unlock(&drm_dev->struct_mutex);
 193
 194         return count;
 195 }
 196
 197 static ssize_t
 198 i915_l3_write(struct file *filp, struct kobject *kobj,
 199               struct bin_attribute *attr, char *buf,
 200               loff_t offset, size_t count)
 201 {
 202         struct device *dev = kobj_to_dev(kobj);
 203         struct drm_minor *dminor = dev_to_drm_minor(dev);
 204         struct drm_device *drm_dev = dminor->dev;
 205         struct drm_i915_private *dev_priv = to_i915(drm_dev);
 206         struct i915_gem_context *ctx;
 207         u32 *temp = NULL; /* Just here to make handling failures easy */
 208         int slice = (int)(uintptr_t)attr->private;
 209         int ret;
 210
 211         if (!HAS_HW_CONTEXTS(drm_dev))
 212                 return -ENXIO;
 213
 214         ret = l3_access_valid(drm_dev, offset);
 215         if (ret)
 216                 return ret;
 217
 218         ret = i915_mutex_lock_interruptible(drm_dev);
 219         if (ret)
 220                 return ret;
 221
 222         if (!dev_priv->l3_parity.remap_info[slice]) {
 223                 temp = kzalloc(GEN7_L3LOG_SIZE, GFP_KERNEL);
 224                 if (!temp) {
 225                         mutex_unlock(&drm_dev->struct_mutex);
 226                         return -ENOMEM;
 227                 }
 228         }
 229
 230         /* TODO: Ideally we really want a GPU reset here to make sure errors
 231          * aren't propagated. Since I cannot find a stable way to reset the GPU
 232          * at this point it is left as a TODO.
 233         */
 234         if (temp)
 235                 dev_priv->l3_parity.remap_info[slice] = temp;
 236
 237         memcpy(dev_priv->l3_parity.remap_info[slice] + (offset/4), buf, count);
 238
 239         /* NB: We defer the remapping until we switch to the context */
 240         list_for_each_entry(ctx, &dev_priv->context_list, link)
 241                 ctx->remap_slice |= (1<<slice);
 242
 243         mutex_unlock(&drm_dev->struct_mutex);
 244
 245         return count;
 246 }
 247
 248 static struct bin_attribute dpf_attrs = {
 249         .attr = {.name = "l3_parity", .mode = (S_IRUSR | S_IWUSR)},
 250         .size = GEN7_L3LOG_SIZE,
 251         .read = i915_l3_read,
 252         .write = i915_l3_write,
 253         .mmap = NULL,
 254         .private = (void *)0
 255 };
 256
 257 static struct bin_attribute dpf_attrs_1 = {
 258         .attr = {.name = "l3_parity_slice_1", .mode = (S_IRUSR | S_IWUSR)},
 259         .size = GEN7_L3LOG_SIZE,
 260         .read = i915_l3_read,
 261         .write = i915_l3_write,
 262         .mmap = NULL,
 263         .private = (void *)1
 264 };
 265
 266 static ssize_t gt_act_freq_mhz_show(struct device *kdev,
 267                                     struct device_attribute *attr, char *buf)
 268 {
 269         struct drm_minor *minor = dev_to_drm_minor(kdev);
 270         struct drm_device *dev = minor->dev;
 271         struct drm_i915_private *dev_priv = to_i915(dev);
 272         int ret;
 273
 274         intel_runtime_pm_get(dev_priv);
 275
 276         mutex_lock(&dev_priv->rps.hw_lock);
 277         if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv)) {
 278                 u32 freq;
 279                 freq = vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS);
 280                 ret = intel_gpu_freq(dev_priv, (freq >> 8) & 0xff);
 281         } else {
 282                 u32 rpstat = I915_READ(GEN6_RPSTAT1);
 283                 if (IS_GEN9(dev_priv))
 284                         ret = (rpstat & GEN9_CAGF_MASK) >> GEN9_CAGF_SHIFT;
 285                 else if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv))
 286                         ret = (rpstat & HSW_CAGF_MASK) >> HSW_CAGF_SHIFT;
 287                 else
 288                         ret = (rpstat & GEN6_CAGF_MASK) >> GEN6_CAGF_SHIFT;
 289                 ret = intel_gpu_freq(dev_priv, ret);
 290         }
 291         mutex_unlock(&dev_priv->rps.hw_lock);
 292
 293         intel_runtime_pm_put(dev_priv);
 294
 295         return snprintf(buf, PAGE_SIZE, "%d\n", ret);
 296 }
 297
 298 static ssize_t gt_cur_freq_mhz_show(struct device *kdev,
 299                                     struct device_attribute *attr, char *buf)
 300 {
 301         struct drm_minor *minor = dev_to_drm_minor(kdev);
 302         struct drm_device *dev = minor->dev;
 303         struct drm_i915_private *dev_priv = to_i915(dev);
 304
 305         return snprintf(buf, PAGE_SIZE, "%d\n",
 306                         intel_gpu_freq(dev_priv,
 307                                        dev_priv->rps.cur_freq));
 308 }
 309
 310 static ssize_t gt_boost_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 311 {
 312         struct drm_minor *minor = dev_to_drm_minor(kdev);
 313         struct drm_i915_private *dev_priv = to_i915(minor->dev);
 314
 315         return snprintf(buf, PAGE_SIZE, "%d\n",
 316                         intel_gpu_freq(dev_priv,
 317                                        dev_priv->rps.boost_freq));
 318 }
 319
 320 static ssize_t gt_boost_freq_mhz_store(struct device *kdev,
 321                                        struct device_attribute *attr,
 322                                        const char *buf, size_t count)
 323 {
 324         struct drm_minor *minor = dev_to_drm_minor(kdev);
 325         struct drm_device *dev = minor->dev;
 326         struct drm_i915_private *dev_priv = dev->dev_private;
 327         u32 val;
 328         ssize_t ret;
 329
 330         ret = kstrtou32(buf, 0, &val);
 331         if (ret)
 332                 return ret;
 333
 334         /* Validate against (static) hardware limits */
 335         val = intel_freq_opcode(dev_priv, val);
 336         if (val < dev_priv->rps.min_freq || val > dev_priv->rps.max_freq)
 337                 return -EINVAL;
 338
 339         mutex_lock(&dev_priv->rps.hw_lock);
 340         dev_priv->rps.boost_freq = val;
 341         mutex_unlock(&dev_priv->rps.hw_lock);
 342
 343         return count;
 344 }
 345
 346 static ssize_t vlv_rpe_freq_mhz_show(struct device *kdev,
 347                                      struct device_attribute *attr, char *buf)
 348 {
 349         struct drm_minor *minor = dev_to_drm_minor(kdev);
 350         struct drm_device *dev = minor->dev;
 351         struct drm_i915_private *dev_priv = to_i915(dev);
 352
 353         return snprintf(buf, PAGE_SIZE, "%d\n",
 354                         intel_gpu_freq(dev_priv,
 355                                        dev_priv->rps.efficient_freq));
 356 }
 357
 358 static ssize_t gt_max_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 359 {
 360         struct drm_minor *minor = dev_to_drm_minor(kdev);
 361         struct drm_device *dev = minor->dev;
 362         struct drm_i915_private *dev_priv = to_i915(dev);
 363
 364         return snprintf(buf, PAGE_SIZE, "%d\n",
 365                         intel_gpu_freq(dev_priv,
 366                                        dev_priv->rps.max_freq_softlimit));
 367 }
 368
 369 static ssize_t gt_max_freq_mhz_store(struct device *kdev,
 370                                      struct device_attribute *attr,
 371                                      const char *buf, size_t count)
 372 {
 373         struct drm_minor *minor = dev_to_drm_minor(kdev);
 374         struct drm_device *dev = minor->dev;
 375         struct drm_i915_private *dev_priv = to_i915(dev);
 376         u32 val;
 377         ssize_t ret;
 378
 379         ret = kstrtou32(buf, 0, &val);
 380         if (ret)
 381                 return ret;
 382
 383         intel_runtime_pm_get(dev_priv);
 384
 385         mutex_lock(&dev_priv->rps.hw_lock);
 386
 387         val = intel_freq_opcode(dev_priv, val);
 388
 389         if (val < dev_priv->rps.min_freq ||
 390             val > dev_priv->rps.max_freq ||
 391             val < dev_priv->rps.min_freq_softlimit) {
 392                 mutex_unlock(&dev_priv->rps.hw_lock);
 393                 intel_runtime_pm_put(dev_priv);
 394                 return -EINVAL;
 395         }
 396
 397         if (val > dev_priv->rps.rp0_freq)
 398                 DRM_DEBUG("User requested overclocking to %d\n",
 399                           intel_gpu_freq(dev_priv, val));
 400
 401         dev_priv->rps.max_freq_softlimit = val;
 402
 403         val = clamp_t(int, dev_priv->rps.cur_freq,
 404                       dev_priv->rps.min_freq_softlimit,
 405                       dev_priv->rps.max_freq_softlimit);
 406
 407         /* We still need *_set_rps to process the new max_delay and
 408          * update the interrupt limits and PMINTRMSK even though
 409          * frequency request may be unchanged. */
 410         intel_set_rps(dev_priv, val);
 411
 412         mutex_unlock(&dev_priv->rps.hw_lock);
 413
 414         intel_runtime_pm_put(dev_priv);
 415
 416         return count;
 417 }
 418
 419 static ssize_t gt_min_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 420 {
 421         struct drm_minor *minor = dev_to_drm_minor(kdev);
 422         struct drm_device *dev = minor->dev;
 423         struct drm_i915_private *dev_priv = to_i915(dev);
 424
 425         return snprintf(buf, PAGE_SIZE, "%d\n",
 426                         intel_gpu_freq(dev_priv,
 427                                        dev_priv->rps.min_freq_softlimit));
 428 }
 429
 430 static ssize_t gt_min_freq_mhz_store(struct device *kdev,
 431                                      struct device_attribute *attr,
 432                                      const char *buf, size_t count)
 433 {
 434         struct drm_minor *minor = dev_to_drm_minor(kdev);
 435         struct drm_device *dev = minor->dev;
 436         struct drm_i915_private *dev_priv = to_i915(dev);
 437         u32 val;
 438         ssize_t ret;
 439
 440         ret = kstrtou32(buf, 0, &val);
 441         if (ret)
 442                 return ret;
 443
 444         intel_runtime_pm_get(dev_priv);
 445
 446         mutex_lock(&dev_priv->rps.hw_lock);
 447
 448         val = intel_freq_opcode(dev_priv, val);
 449
 450         if (val < dev_priv->rps.min_freq ||
 451             val > dev_priv->rps.max_freq ||
 452             val > dev_priv->rps.max_freq_softlimit) {
 453                 mutex_unlock(&dev_priv->rps.hw_lock);
 454                 intel_runtime_pm_put(dev_priv);
 455                 return -EINVAL;
 456         }
 457
 458         dev_priv->rps.min_freq_softlimit = val;
 459
 460         val = clamp_t(int, dev_priv->rps.cur_freq,
 461                       dev_priv->rps.min_freq_softlimit,
 462                       dev_priv->rps.max_freq_softlimit);
 463
 464         /* We still need *_set_rps to process the new min_delay and
 465          * update the interrupt limits and PMINTRMSK even though
 466          * frequency request may be unchanged. */
 467         intel_set_rps(dev_priv, val);
 468
 469         mutex_unlock(&dev_priv->rps.hw_lock);
 470
 471         intel_runtime_pm_put(dev_priv);
 472
 473         return count;
 474
 475 }
 476
 477 static DEVICE_ATTR(gt_act_freq_mhz, S_IRUGO, gt_act_freq_mhz_show, NULL);
 478 static DEVICE_ATTR(gt_cur_freq_mhz, S_IRUGO, gt_cur_freq_mhz_show, NULL);
 479 static DEVICE_ATTR(gt_boost_freq_mhz, S_IRUGO, gt_boost_freq_mhz_show, gt_boost_freq_mhz_store);
 480 static DEVICE_ATTR(gt_max_freq_mhz, S_IRUGO | S_IWUSR, gt_max_freq_mhz_show, gt_max_freq_mhz_store);
 481 static DEVICE_ATTR(gt_min_freq_mhz, S_IRUGO | S_IWUSR, gt_min_freq_mhz_show, gt_min_freq_mhz_store);
 482
 483 static DEVICE_ATTR(vlv_rpe_freq_mhz, S_IRUGO, vlv_rpe_freq_mhz_show, NULL);
 484
 485 static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf);
 486 static DEVICE_ATTR(gt_RP0_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 487 static DEVICE_ATTR(gt_RP1_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 488 static DEVICE_ATTR(gt_RPn_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 489
 490 /* For now we have a static number of RP states */
 491 static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 492 {
 493         struct drm_minor *minor = dev_to_drm_minor(kdev);
 494         struct drm_device *dev = minor->dev;
 495         struct drm_i915_private *dev_priv = to_i915(dev);
 496         u32 val;
 497
 498         if (attr == &dev_attr_gt_RP0_freq_mhz)
 499                 val = intel_gpu_freq(dev_priv, dev_priv->rps.rp0_freq);
 500         else if (attr == &dev_attr_gt_RP1_freq_mhz)
 501                 val = intel_gpu_freq(dev_priv, dev_priv->rps.rp1_freq);
 502         else if (attr == &dev_attr_gt_RPn_freq_mhz)
 503                 val = intel_gpu_freq(dev_priv, dev_priv->rps.min_freq);
 504         else
 505                 BUG();
 506
 507         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 508 }
 509
 510 static const struct attribute *gen6_attrs[] = {
 511         &dev_attr_gt_act_freq_mhz.attr,
 512         &dev_attr_gt_cur_freq_mhz.attr,
 513         &dev_attr_gt_boost_freq_mhz.attr,
 514         &dev_attr_gt_max_freq_mhz.attr,
 515         &dev_attr_gt_min_freq_mhz.attr,
 516         &dev_attr_gt_RP0_freq_mhz.attr,
 517         &dev_attr_gt_RP1_freq_mhz.attr,
 518         &dev_attr_gt_RPn_freq_mhz.attr,
 519         NULL,
 520 };
 521
 522 static const struct attribute *vlv_attrs[] = {
 523         &dev_attr_gt_act_freq_mhz.attr,
 524         &dev_attr_gt_cur_freq_mhz.attr,
 525         &dev_attr_gt_boost_freq_mhz.attr,
 526         &dev_attr_gt_max_freq_mhz.attr,
 527         &dev_attr_gt_min_freq_mhz.attr,
 528         &dev_attr_gt_RP0_freq_mhz.attr,
 529         &dev_attr_gt_RP1_freq_mhz.attr,
 530         &dev_attr_gt_RPn_freq_mhz.attr,
 531         &dev_attr_vlv_rpe_freq_mhz.attr,
 532         NULL,
 533 };
 534
 535 static ssize_t error_state_read(struct file *filp, struct kobject *kobj,
 536                                 struct bin_attribute *attr, char *buf,
 537                                 loff_t off, size_t count)
 538 {
 539
 540         struct device *kdev = kobj_to_dev(kobj);
 541         struct drm_minor *minor = dev_to_drm_minor(kdev);
 542         struct drm_device *dev = minor->dev;
 543         struct i915_error_state_file_priv error_priv;
 544         struct drm_i915_error_state_buf error_str;
 545         ssize_t ret_count = 0;
 546         int ret;
 547
 548         memset(&error_priv, 0, sizeof(error_priv));
 549
 550         ret = i915_error_state_buf_init(&error_str, to_i915(dev), count, off);
 551         if (ret)
 552                 return ret;
 553
 554         error_priv.dev = dev;
 555         i915_error_state_get(dev, &error_priv);
 556
 557         ret = i915_error_state_to_str(&error_str, &error_priv);
 558         if (ret)
 559                 goto out;
 560
 561         ret_count = count < error_str.bytes ? count : error_str.bytes;
 562
 563         memcpy(buf, error_str.buf, ret_count);
 564 out:
 565         i915_error_state_put(&error_priv);
 566         i915_error_state_buf_release(&error_str);
 567
 568         return ret ?: ret_count;
 569 }
 570
 571 static ssize_t error_state_write(struct file *file, struct kobject *kobj,
 572                                  struct bin_attribute *attr, char *buf,
 573                                  loff_t off, size_t count)
 574 {
 575         struct device *kdev = kobj_to_dev(kobj);
 576         struct drm_minor *minor = dev_to_drm_minor(kdev);
 577         struct drm_device *dev = minor->dev;
 578         int ret;
 579
 580         DRM_DEBUG_DRIVER("Resetting error state\n");
 581
 582         ret = mutex_lock_interruptible(&dev->struct_mutex);
 583         if (ret)
 584                 return ret;
 585
 586         i915_destroy_error_state(dev);
 587         mutex_unlock(&dev->struct_mutex);
 588
 589         return count;
 590 }
 591
 592 static struct bin_attribute error_state_attr = {
 593         .attr.name = "error",
 594         .attr.mode = S_IRUSR | S_IWUSR,
 595         .size = 0,
 596         .read = error_state_read,
 597         .write = error_state_write,
 598 };
 599 #endif
 600
 601 void i915_setup_sysfs(struct drm_device *dev)
 602 {
 603 #if 0
 604         int ret;
 605
 606 #ifdef CONFIG_PM
 607         if (HAS_RC6(dev)) {
 608                 ret = sysfs_merge_group(&dev->primary->kdev->kobj,
 609                                         &rc6_attr_group);
 610                 if (ret)
 611                         DRM_ERROR("RC6 residency sysfs setup failed\n");
 612         }
 613         if (HAS_RC6p(dev)) {
 614                 ret = sysfs_merge_group(&dev->primary->kdev->kobj,
 615                                         &rc6p_attr_group);
 616                 if (ret)
 617                         DRM_ERROR("RC6p residency sysfs setup failed\n");
 618         }
 619         if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev)) {
 620                 ret = sysfs_merge_group(&dev->primary->kdev->kobj,
 621                                         &media_rc6_attr_group);
 622                 if (ret)
 623                         DRM_ERROR("Media RC6 residency sysfs setup failed\n");
 624         }
 625 #endif
 626         if (HAS_L3_DPF(dev)) {
 627                 ret = device_create_bin_file(dev->primary->kdev, &dpf_attrs);
 628                 if (ret)
 629                         DRM_ERROR("l3 parity sysfs setup failed\n");
 630
 631                 if (NUM_L3_SLICES(dev) > 1) {
 632                         ret = device_create_bin_file(dev->primary->kdev,
 633                                                      &dpf_attrs_1);
 634                         if (ret)
 635                                 DRM_ERROR("l3 parity slice 1 setup failed\n");
 636                 }
 637         }
 638
 639         ret = 0;
 640         if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev))
 641                 ret = sysfs_create_files(&dev->primary->kdev->kobj, vlv_attrs);
 642         else if (INTEL_INFO(dev)->gen >= 6)
 643                 ret = sysfs_create_files(&dev->primary->kdev->kobj, gen6_attrs);
 644         if (ret)
 645                 DRM_ERROR("RPS sysfs setup failed\n");
 646
 647         ret = sysfs_create_bin_file(&dev->primary->kdev->kobj,
 648                                     &error_state_attr);
 649         if (ret)
 650                 DRM_ERROR("error_state sysfs setup failed\n");
 651 #endif
 652 }
 653
 654 void i915_teardown_sysfs(struct drm_device *dev)
 655 {
 656 #if 0
 657         sysfs_remove_bin_file(&dev->primary->kdev->kobj, &error_state_attr);
 658         if (IS_VALLEYVIEW(dev) || IS_CHERRYVIEW(dev))
 659                 sysfs_remove_files(&dev->primary->kdev->kobj, vlv_attrs);
 660         else
 661                 sysfs_remove_files(&dev->primary->kdev->kobj, gen6_attrs);
 662         device_remove_bin_file(dev->primary->kdev,  &dpf_attrs_1);
 663         device_remove_bin_file(dev->primary->kdev,  &dpf_attrs);
 664 #ifdef CONFIG_PM
 665         sysfs_unmerge_group(&dev->primary->kdev->kobj, &rc6_attr_group);
 666         sysfs_unmerge_group(&dev->primary->kdev->kobj, &rc6p_attr_group);
 667 #endif
 668 #endif
 669 }