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 #ifdef CONFIG_PM
  36 static u32 calc_residency(struct drm_device *dev, const u32 reg)
  37 {
  38         struct drm_i915_private *dev_priv = dev->dev_private;
  39         u64 raw_time; /* 32b value may overflow during fixed point math */
  40
  41         if (!intel_enable_rc6(dev))
  42                 return 0;
  43
  44         raw_time = I915_READ(reg) * 128ULL;
  45         return DIV_ROUND_UP_ULL(raw_time, 100000);
  46 }
  47
  48 static ssize_t
  49 show_rc6_mask(struct device *kdev, struct device_attribute *attr, char *buf)
  50 {
  51         struct drm_minor *dminor = container_of(kdev, struct drm_minor, kdev);
  52         return snprintf(buf, PAGE_SIZE, "%x\n", intel_enable_rc6(dminor->dev));
  53 }
  54
  55 static ssize_t
  56 show_rc6_ms(struct device *kdev, struct device_attribute *attr, char *buf)
  57 {
  58         struct drm_minor *dminor = container_of(kdev, struct drm_minor, kdev);
  59         u32 rc6_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6);
  60         return snprintf(buf, PAGE_SIZE, "%u\n", rc6_residency);
  61 }
  62
  63 static ssize_t
  64 show_rc6p_ms(struct device *kdev, struct device_attribute *attr, char *buf)
  65 {
  66         struct drm_minor *dminor = container_of(kdev, struct drm_minor, kdev);
  67         u32 rc6p_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6p);
  68         return snprintf(buf, PAGE_SIZE, "%u\n", rc6p_residency);
  69 }
  70
  71 static ssize_t
  72 show_rc6pp_ms(struct device *kdev, struct device_attribute *attr, char *buf)
  73 {
  74         struct drm_minor *dminor = container_of(kdev, struct drm_minor, kdev);
  75         u32 rc6pp_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6pp);
  76         return snprintf(buf, PAGE_SIZE, "%u\n", rc6pp_residency);
  77 }
  78
  79 static DEVICE_ATTR(rc6_enable, S_IRUGO, show_rc6_mask, NULL);
  80 static DEVICE_ATTR(rc6_residency_ms, S_IRUGO, show_rc6_ms, NULL);
  81 static DEVICE_ATTR(rc6p_residency_ms, S_IRUGO, show_rc6p_ms, NULL);
  82 static DEVICE_ATTR(rc6pp_residency_ms, S_IRUGO, show_rc6pp_ms, NULL);
  83
  84 static struct attribute *rc6_attrs[] = {
  85         &dev_attr_rc6_enable.attr,
  86         &dev_attr_rc6_residency_ms.attr,
  87         &dev_attr_rc6p_residency_ms.attr,
  88         &dev_attr_rc6pp_residency_ms.attr,
  89         NULL
  90 };
  91
  92 static struct attribute_group rc6_attr_group = {
  93         .name = power_group_name,
  94         .attrs =  rc6_attrs
  95 };
  96 #endif
  97
  98 static int l3_access_valid(struct drm_device *dev, loff_t offset)
  99 {
 100         if (!HAS_L3_GPU_CACHE(dev))
 101                 return -EPERM;
 102
 103         if (offset % 4 != 0)
 104                 return -EINVAL;
 105
 106         if (offset >= GEN7_L3LOG_SIZE)
 107                 return -ENXIO;
 108
 109         return 0;
 110 }
 111
 112 static ssize_t
 113 i915_l3_read(struct file *filp, struct kobject *kobj,
 114              struct bin_attribute *attr, char *buf,
 115              loff_t offset, size_t count)
 116 {
 117         struct device *dev = container_of(kobj, struct device, kobj);
 118         struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
 119         struct drm_device *drm_dev = dminor->dev;
 120         struct drm_i915_private *dev_priv = drm_dev->dev_private;
 121         uint32_t misccpctl;
 122         int i, ret;
 123
 124         ret = l3_access_valid(drm_dev, offset);
 125         if (ret)
 126                 return ret;
 127
 128         ret = i915_mutex_lock_interruptible(drm_dev);
 129         if (ret)
 130                 return ret;
 131
 132         misccpctl = I915_READ(GEN7_MISCCPCTL);
 133         I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);
 134
 135         for (i = offset; count >= 4 && i < GEN7_L3LOG_SIZE; i += 4, count -= 4)
 136                 *((uint32_t *)(&buf[i])) = I915_READ(GEN7_L3LOG_BASE + i);
 137
 138         I915_WRITE(GEN7_MISCCPCTL, misccpctl);
 139
 140         mutex_unlock(&drm_dev->struct_mutex);
 141
 142         return i - offset;
 143 }
 144
 145 static ssize_t
 146 i915_l3_write(struct file *filp, struct kobject *kobj,
 147               struct bin_attribute *attr, char *buf,
 148               loff_t offset, size_t count)
 149 {
 150         struct device *dev = container_of(kobj, struct device, kobj);
 151         struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
 152         struct drm_device *drm_dev = dminor->dev;
 153         struct drm_i915_private *dev_priv = drm_dev->dev_private;
 154         u32 *temp = NULL; /* Just here to make handling failures easy */
 155         int ret;
 156
 157         ret = l3_access_valid(drm_dev, offset);
 158         if (ret)
 159                 return ret;
 160
 161         ret = i915_mutex_lock_interruptible(drm_dev);
 162         if (ret)
 163                 return ret;
 164
 165         if (!dev_priv->l3_parity.remap_info) {
 166                 temp = kzalloc(GEN7_L3LOG_SIZE, GFP_KERNEL);
 167                 if (!temp) {
 168                         mutex_unlock(&drm_dev->struct_mutex);
 169                         return -ENOMEM;
 170                 }
 171         }
 172
 173         ret = i915_gpu_idle(drm_dev);
 174         if (ret) {
 175                 kfree(temp);
 176                 mutex_unlock(&drm_dev->struct_mutex);
 177                 return ret;
 178         }
 179
 180         /* TODO: Ideally we really want a GPU reset here to make sure errors
 181          * aren't propagated. Since I cannot find a stable way to reset the GPU
 182          * at this point it is left as a TODO.
 183         */
 184         if (temp)
 185                 dev_priv->l3_parity.remap_info = temp;
 186
 187         memcpy(dev_priv->l3_parity.remap_info + (offset/4),
 188                buf + (offset/4),
 189                count);
 190
 191         i915_gem_l3_remap(drm_dev);
 192
 193         mutex_unlock(&drm_dev->struct_mutex);
 194
 195         return count;
 196 }
 197
 198 static struct bin_attribute dpf_attrs = {
 199         .attr = {.name = "l3_parity", .mode = (S_IRUSR | S_IWUSR)},
 200         .size = GEN7_L3LOG_SIZE,
 201         .read = i915_l3_read,
 202         .write = i915_l3_write,
 203         .mmap = NULL
 204 };
 205
 206 static ssize_t gt_cur_freq_mhz_show(struct device *kdev,
 207                                     struct device_attribute *attr, char *buf)
 208 {
 209         struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 210         struct drm_device *dev = minor->dev;
 211         struct drm_i915_private *dev_priv = dev->dev_private;
 212         int ret;
 213
 214         mutex_lock(&dev_priv->rps.hw_lock);
 215         if (IS_VALLEYVIEW(dev_priv->dev)) {
 216                 u32 freq;
 217                 freq = vlv_punit_read(dev_priv, PUNIT_REG_GPU_FREQ_STS);
 218                 ret = vlv_gpu_freq(dev_priv->mem_freq, (freq >> 8) & 0xff);
 219         } else {
 220                 ret = dev_priv->rps.cur_delay * GT_FREQUENCY_MULTIPLIER;
 221         }
 222         mutex_unlock(&dev_priv->rps.hw_lock);
 223
 224         return snprintf(buf, PAGE_SIZE, "%d\n", ret);
 225 }
 226
 227 static ssize_t vlv_rpe_freq_mhz_show(struct device *kdev,
 228                                      struct device_attribute *attr, char *buf)
 229 {
 230         struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 231         struct drm_device *dev = minor->dev;
 232         struct drm_i915_private *dev_priv = dev->dev_private;
 233
 234         return snprintf(buf, PAGE_SIZE, "%d\n",
 235                         vlv_gpu_freq(dev_priv->mem_freq,
 236                                      dev_priv->rps.rpe_delay));
 237 }
 238
 239 static ssize_t gt_max_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 240 {
 241         struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 242         struct drm_device *dev = minor->dev;
 243         struct drm_i915_private *dev_priv = dev->dev_private;
 244         int ret;
 245
 246         mutex_lock(&dev_priv->rps.hw_lock);
 247         if (IS_VALLEYVIEW(dev_priv->dev))
 248                 ret = vlv_gpu_freq(dev_priv->mem_freq, dev_priv->rps.max_delay);
 249         else
 250                 ret = dev_priv->rps.max_delay * GT_FREQUENCY_MULTIPLIER;
 251         mutex_unlock(&dev_priv->rps.hw_lock);
 252
 253         return snprintf(buf, PAGE_SIZE, "%d\n", ret);
 254 }
 255
 256 static ssize_t gt_max_freq_mhz_store(struct device *kdev,
 257                                      struct device_attribute *attr,
 258                                      const char *buf, size_t count)
 259 {
 260         struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 261         struct drm_device *dev = minor->dev;
 262         struct drm_i915_private *dev_priv = dev->dev_private;
 263         u32 val, rp_state_cap, hw_max, hw_min, non_oc_max;
 264         ssize_t ret;
 265
 266         ret = kstrtou32(buf, 0, &val);
 267         if (ret)
 268                 return ret;
 269
 270         mutex_lock(&dev_priv->rps.hw_lock);
 271
 272         if (IS_VALLEYVIEW(dev_priv->dev)) {
 273                 val = vlv_freq_opcode(dev_priv->mem_freq, val);
 274
 275                 hw_max = valleyview_rps_max_freq(dev_priv);
 276                 hw_min = valleyview_rps_min_freq(dev_priv);
 277                 non_oc_max = hw_max;
 278         } else {
 279                 val /= GT_FREQUENCY_MULTIPLIER;
 280
 281                 rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
 282                 hw_max = dev_priv->rps.hw_max;
 283                 non_oc_max = (rp_state_cap & 0xff);
 284                 hw_min = ((rp_state_cap & 0xff0000) >> 16);
 285         }
 286
 287         if (val < hw_min || val > hw_max ||
 288             val < dev_priv->rps.min_delay) {
 289                 mutex_unlock(&dev_priv->rps.hw_lock);
 290                 return -EINVAL;
 291         }
 292
 293         if (val > non_oc_max)
 294                 DRM_DEBUG("User requested overclocking to %d\n",
 295                           val * GT_FREQUENCY_MULTIPLIER);
 296
 297         if (dev_priv->rps.cur_delay > val) {
 298                 if (IS_VALLEYVIEW(dev_priv->dev))
 299                         valleyview_set_rps(dev_priv->dev, val);
 300                 else
 301                         gen6_set_rps(dev_priv->dev, val);
 302         }
 303
 304         dev_priv->rps.max_delay = val;
 305
 306         mutex_unlock(&dev_priv->rps.hw_lock);
 307
 308         return count;
 309 }
 310
 311 static ssize_t gt_min_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 312 {
 313         struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 314         struct drm_device *dev = minor->dev;
 315         struct drm_i915_private *dev_priv = dev->dev_private;
 316         int ret;
 317
 318         mutex_lock(&dev_priv->rps.hw_lock);
 319         if (IS_VALLEYVIEW(dev_priv->dev))
 320                 ret = vlv_gpu_freq(dev_priv->mem_freq, dev_priv->rps.min_delay);
 321         else
 322                 ret = dev_priv->rps.min_delay * GT_FREQUENCY_MULTIPLIER;
 323         mutex_unlock(&dev_priv->rps.hw_lock);
 324
 325         return snprintf(buf, PAGE_SIZE, "%d\n", ret);
 326 }
 327
 328 static ssize_t gt_min_freq_mhz_store(struct device *kdev,
 329                                      struct device_attribute *attr,
 330                                      const char *buf, size_t count)
 331 {
 332         struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 333         struct drm_device *dev = minor->dev;
 334         struct drm_i915_private *dev_priv = dev->dev_private;
 335         u32 val, rp_state_cap, hw_max, hw_min;
 336         ssize_t ret;
 337
 338         ret = kstrtou32(buf, 0, &val);
 339         if (ret)
 340                 return ret;
 341
 342         mutex_lock(&dev_priv->rps.hw_lock);
 343
 344         if (IS_VALLEYVIEW(dev)) {
 345                 val = vlv_freq_opcode(dev_priv->mem_freq, val);
 346
 347                 hw_max = valleyview_rps_max_freq(dev_priv);
 348                 hw_min = valleyview_rps_min_freq(dev_priv);
 349         } else {
 350                 val /= GT_FREQUENCY_MULTIPLIER;
 351
 352                 rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
 353                 hw_max = dev_priv->rps.hw_max;
 354                 hw_min = ((rp_state_cap & 0xff0000) >> 16);
 355         }
 356
 357         if (val < hw_min || val > hw_max || val > dev_priv->rps.max_delay) {
 358                 mutex_unlock(&dev_priv->rps.hw_lock);
 359                 return -EINVAL;
 360         }
 361
 362         if (dev_priv->rps.cur_delay < val) {
 363                 if (IS_VALLEYVIEW(dev))
 364                         valleyview_set_rps(dev, val);
 365                 else
 366                         gen6_set_rps(dev_priv->dev, val);
 367         }
 368
 369         dev_priv->rps.min_delay = val;
 370
 371         mutex_unlock(&dev_priv->rps.hw_lock);
 372
 373         return count;
 374
 375 }
 376
 377 static DEVICE_ATTR(gt_cur_freq_mhz, S_IRUGO, gt_cur_freq_mhz_show, NULL);
 378 static DEVICE_ATTR(gt_max_freq_mhz, S_IRUGO | S_IWUSR, gt_max_freq_mhz_show, gt_max_freq_mhz_store);
 379 static DEVICE_ATTR(gt_min_freq_mhz, S_IRUGO | S_IWUSR, gt_min_freq_mhz_show, gt_min_freq_mhz_store);
 380
 381 static DEVICE_ATTR(vlv_rpe_freq_mhz, S_IRUGO, vlv_rpe_freq_mhz_show, NULL);
 382
 383 static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf);
 384 static DEVICE_ATTR(gt_RP0_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 385 static DEVICE_ATTR(gt_RP1_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 386 static DEVICE_ATTR(gt_RPn_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 387
 388 /* For now we have a static number of RP states */
 389 static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 390 {
 391         struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 392         struct drm_device *dev = minor->dev;
 393         struct drm_i915_private *dev_priv = dev->dev_private;
 394         u32 val, rp_state_cap;
 395         ssize_t ret;
 396
 397         ret = mutex_lock_interruptible(&dev->struct_mutex);
 398         if (ret)
 399                 return ret;
 400         rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
 401         mutex_unlock(&dev->struct_mutex);
 402
 403         if (attr == &dev_attr_gt_RP0_freq_mhz) {
 404                 val = ((rp_state_cap & 0x0000ff) >> 0) * GT_FREQUENCY_MULTIPLIER;
 405         } else if (attr == &dev_attr_gt_RP1_freq_mhz) {
 406                 val = ((rp_state_cap & 0x00ff00) >> 8) * GT_FREQUENCY_MULTIPLIER;
 407         } else if (attr == &dev_attr_gt_RPn_freq_mhz) {
 408                 val = ((rp_state_cap & 0xff0000) >> 16) * GT_FREQUENCY_MULTIPLIER;
 409         } else {
 410                 BUG();
 411         }
 412         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 413 }
 414
 415 static const struct attribute *gen6_attrs[] = {
 416         &dev_attr_gt_cur_freq_mhz.attr,
 417         &dev_attr_gt_max_freq_mhz.attr,
 418         &dev_attr_gt_min_freq_mhz.attr,
 419         &dev_attr_gt_RP0_freq_mhz.attr,
 420         &dev_attr_gt_RP1_freq_mhz.attr,
 421         &dev_attr_gt_RPn_freq_mhz.attr,
 422         NULL,
 423 };
 424
 425 static const struct attribute *vlv_attrs[] = {
 426         &dev_attr_gt_cur_freq_mhz.attr,
 427         &dev_attr_gt_max_freq_mhz.attr,
 428         &dev_attr_gt_min_freq_mhz.attr,
 429         &dev_attr_vlv_rpe_freq_mhz.attr,
 430         NULL,
 431 };
 432
 433 static ssize_t error_state_read(struct file *filp, struct kobject *kobj,
 434                                 struct bin_attribute *attr, char *buf,
 435                                 loff_t off, size_t count)
 436 {
 437
 438         struct device *kdev = container_of(kobj, struct device, kobj);
 439         struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 440         struct drm_device *dev = minor->dev;
 441         struct i915_error_state_file_priv error_priv;
 442         struct drm_i915_error_state_buf error_str;
 443         ssize_t ret_count = 0;
 444         int ret;
 445
 446         memset(&error_priv, 0, sizeof(error_priv));
 447
 448         ret = i915_error_state_buf_init(&error_str, count, off);
 449         if (ret)
 450                 return ret;
 451
 452         error_priv.dev = dev;
 453         i915_error_state_get(dev, &error_priv);
 454
 455         ret = i915_error_state_to_str(&error_str, &error_priv);
 456         if (ret)
 457                 goto out;
 458
 459         ret_count = count < error_str.bytes ? count : error_str.bytes;
 460
 461         memcpy(buf, error_str.buf, ret_count);
 462 out:
 463         i915_error_state_put(&error_priv);
 464         i915_error_state_buf_release(&error_str);
 465
 466         return ret ?: ret_count;
 467 }
 468
 469 static ssize_t error_state_write(struct file *file, struct kobject *kobj,
 470                                  struct bin_attribute *attr, char *buf,
 471                                  loff_t off, size_t count)
 472 {
 473         struct device *kdev = container_of(kobj, struct device, kobj);
 474         struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 475         struct drm_device *dev = minor->dev;
 476         int ret;
 477
 478         DRM_DEBUG_DRIVER("Resetting error state\n");
 479
 480         ret = mutex_lock_interruptible(&dev->struct_mutex);
 481         if (ret)
 482                 return ret;
 483
 484         i915_destroy_error_state(dev);
 485         mutex_unlock(&dev->struct_mutex);
 486
 487         return count;
 488 }
 489
 490 static struct bin_attribute error_state_attr = {
 491         .attr.name = "error",
 492         .attr.mode = S_IRUSR | S_IWUSR,
 493         .size = 0,
 494         .read = error_state_read,
 495         .write = error_state_write,
 496 };
 497
 498 void i915_setup_sysfs(struct drm_device *dev)
 499 {
 500         int ret;
 501
 502 #ifdef CONFIG_PM
 503         if (INTEL_INFO(dev)->gen >= 6) {
 504                 ret = sysfs_merge_group(&dev->primary->kdev.kobj,
 505                                         &rc6_attr_group);
 506                 if (ret)
 507                         DRM_ERROR("RC6 residency sysfs setup failed\n");
 508         }
 509 #endif
 510         if (HAS_L3_GPU_CACHE(dev)) {
 511                 ret = device_create_bin_file(&dev->primary->kdev, &dpf_attrs);
 512                 if (ret)
 513                         DRM_ERROR("l3 parity sysfs setup failed\n");
 514         }
 515
 516         ret = 0;
 517         if (IS_VALLEYVIEW(dev))
 518                 ret = sysfs_create_files(&dev->primary->kdev.kobj, vlv_attrs);
 519         else if (INTEL_INFO(dev)->gen >= 6)
 520                 ret = sysfs_create_files(&dev->primary->kdev.kobj, gen6_attrs);
 521         if (ret)
 522                 DRM_ERROR("RPS sysfs setup failed\n");
 523
 524         ret = sysfs_create_bin_file(&dev->primary->kdev.kobj,
 525                                     &error_state_attr);
 526         if (ret)
 527                 DRM_ERROR("error_state sysfs setup failed\n");
 528 }
 529
 530 void i915_teardown_sysfs(struct drm_device *dev)
 531 {
 532         sysfs_remove_bin_file(&dev->primary->kdev.kobj, &error_state_attr);
 533         if (IS_VALLEYVIEW(dev))
 534                 sysfs_remove_files(&dev->primary->kdev.kobj, vlv_attrs);
 535         else
 536                 sysfs_remove_files(&dev->primary->kdev.kobj, gen6_attrs);
 537         device_remove_bin_file(&dev->primary->kdev,  &dpf_attrs);
 538 #ifdef CONFIG_PM
 539         sysfs_unmerge_group(&dev->primary->kdev.kobj, &rc6_attr_group);
 540 #endif
 541 }