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                 ret = vlv_gpu_freq(dev_priv->mem_freq, dev_priv->rps.cur_delay);
 217         else
 218                 ret = dev_priv->rps.cur_delay * GT_FREQUENCY_MULTIPLIER;
 219         mutex_unlock(&dev_priv->rps.hw_lock);
 220
 221         return snprintf(buf, PAGE_SIZE, "%d\n", ret);
 222 }
 223
 224 static ssize_t gt_max_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 225 {
 226         struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 227         struct drm_device *dev = minor->dev;
 228         struct drm_i915_private *dev_priv = dev->dev_private;
 229         int ret;
 230
 231         mutex_lock(&dev_priv->rps.hw_lock);
 232         if (IS_VALLEYVIEW(dev_priv->dev))
 233                 ret = vlv_gpu_freq(dev_priv->mem_freq, dev_priv->rps.max_delay);
 234         else
 235                 ret = dev_priv->rps.max_delay * GT_FREQUENCY_MULTIPLIER;
 236         mutex_unlock(&dev_priv->rps.hw_lock);
 237
 238         return snprintf(buf, PAGE_SIZE, "%d\n", ret);
 239 }
 240
 241 static ssize_t gt_max_freq_mhz_store(struct device *kdev,
 242                                      struct device_attribute *attr,
 243                                      const char *buf, size_t count)
 244 {
 245         struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 246         struct drm_device *dev = minor->dev;
 247         struct drm_i915_private *dev_priv = dev->dev_private;
 248         u32 val, rp_state_cap, hw_max, hw_min, non_oc_max;
 249         ssize_t ret;
 250
 251         ret = kstrtou32(buf, 0, &val);
 252         if (ret)
 253                 return ret;
 254
 255         mutex_lock(&dev_priv->rps.hw_lock);
 256
 257         if (IS_VALLEYVIEW(dev_priv->dev)) {
 258                 val = vlv_freq_opcode(dev_priv->mem_freq, val);
 259
 260                 hw_max = valleyview_rps_max_freq(dev_priv);
 261                 hw_min = valleyview_rps_min_freq(dev_priv);
 262                 non_oc_max = hw_max;
 263         } else {
 264                 val /= GT_FREQUENCY_MULTIPLIER;
 265
 266                 rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
 267                 hw_max = dev_priv->rps.hw_max;
 268                 non_oc_max = (rp_state_cap & 0xff);
 269                 hw_min = ((rp_state_cap & 0xff0000) >> 16);
 270         }
 271
 272         if (val < hw_min || val > hw_max ||
 273             val < dev_priv->rps.min_delay) {
 274                 mutex_unlock(&dev_priv->rps.hw_lock);
 275                 return -EINVAL;
 276         }
 277
 278         if (val > non_oc_max)
 279                 DRM_DEBUG("User requested overclocking to %d\n",
 280                           val * GT_FREQUENCY_MULTIPLIER);
 281
 282         if (dev_priv->rps.cur_delay > val) {
 283                 if (IS_VALLEYVIEW(dev_priv->dev))
 284                         valleyview_set_rps(dev_priv->dev, val);
 285                 else
 286                         gen6_set_rps(dev_priv->dev, val);
 287         }
 288
 289         dev_priv->rps.max_delay = val;
 290
 291         mutex_unlock(&dev_priv->rps.hw_lock);
 292
 293         return count;
 294 }
 295
 296 static ssize_t gt_min_freq_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 297 {
 298         struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 299         struct drm_device *dev = minor->dev;
 300         struct drm_i915_private *dev_priv = dev->dev_private;
 301         int ret;
 302
 303         mutex_lock(&dev_priv->rps.hw_lock);
 304         if (IS_VALLEYVIEW(dev_priv->dev))
 305                 ret = vlv_gpu_freq(dev_priv->mem_freq, dev_priv->rps.min_delay);
 306         else
 307                 ret = dev_priv->rps.min_delay * GT_FREQUENCY_MULTIPLIER;
 308         mutex_unlock(&dev_priv->rps.hw_lock);
 309
 310         return snprintf(buf, PAGE_SIZE, "%d\n", ret);
 311 }
 312
 313 static ssize_t gt_min_freq_mhz_store(struct device *kdev,
 314                                      struct device_attribute *attr,
 315                                      const char *buf, size_t count)
 316 {
 317         struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 318         struct drm_device *dev = minor->dev;
 319         struct drm_i915_private *dev_priv = dev->dev_private;
 320         u32 val, rp_state_cap, hw_max, hw_min;
 321         ssize_t ret;
 322
 323         ret = kstrtou32(buf, 0, &val);
 324         if (ret)
 325                 return ret;
 326
 327         mutex_lock(&dev_priv->rps.hw_lock);
 328
 329         if (IS_VALLEYVIEW(dev)) {
 330                 val = vlv_freq_opcode(dev_priv->mem_freq, val);
 331
 332                 hw_max = valleyview_rps_max_freq(dev_priv);
 333                 hw_min = valleyview_rps_min_freq(dev_priv);
 334         } else {
 335                 val /= GT_FREQUENCY_MULTIPLIER;
 336
 337                 rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
 338                 hw_max = dev_priv->rps.hw_max;
 339                 hw_min = ((rp_state_cap & 0xff0000) >> 16);
 340         }
 341
 342         if (val < hw_min || val > hw_max || val > dev_priv->rps.max_delay) {
 343                 mutex_unlock(&dev_priv->rps.hw_lock);
 344                 return -EINVAL;
 345         }
 346
 347         if (dev_priv->rps.cur_delay < val) {
 348                 if (IS_VALLEYVIEW(dev))
 349                         valleyview_set_rps(dev, val);
 350                 else
 351                         gen6_set_rps(dev_priv->dev, val);
 352         }
 353
 354         dev_priv->rps.min_delay = val;
 355
 356         mutex_unlock(&dev_priv->rps.hw_lock);
 357
 358         return count;
 359
 360 }
 361
 362 static DEVICE_ATTR(gt_cur_freq_mhz, S_IRUGO, gt_cur_freq_mhz_show, NULL);
 363 static DEVICE_ATTR(gt_max_freq_mhz, S_IRUGO | S_IWUSR, gt_max_freq_mhz_show, gt_max_freq_mhz_store);
 364 static DEVICE_ATTR(gt_min_freq_mhz, S_IRUGO | S_IWUSR, gt_min_freq_mhz_show, gt_min_freq_mhz_store);
 365
 366
 367 static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf);
 368 static DEVICE_ATTR(gt_RP0_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 369 static DEVICE_ATTR(gt_RP1_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 370 static DEVICE_ATTR(gt_RPn_freq_mhz, S_IRUGO, gt_rp_mhz_show, NULL);
 371
 372 /* For now we have a static number of RP states */
 373 static ssize_t gt_rp_mhz_show(struct device *kdev, struct device_attribute *attr, char *buf)
 374 {
 375         struct drm_minor *minor = container_of(kdev, struct drm_minor, kdev);
 376         struct drm_device *dev = minor->dev;
 377         struct drm_i915_private *dev_priv = dev->dev_private;
 378         u32 val, rp_state_cap;
 379         ssize_t ret;
 380
 381         ret = mutex_lock_interruptible(&dev->struct_mutex);
 382         if (ret)
 383                 return ret;
 384         rp_state_cap = I915_READ(GEN6_RP_STATE_CAP);
 385         mutex_unlock(&dev->struct_mutex);
 386
 387         if (attr == &dev_attr_gt_RP0_freq_mhz) {
 388                 val = ((rp_state_cap & 0x0000ff) >> 0) * GT_FREQUENCY_MULTIPLIER;
 389         } else if (attr == &dev_attr_gt_RP1_freq_mhz) {
 390                 val = ((rp_state_cap & 0x00ff00) >> 8) * GT_FREQUENCY_MULTIPLIER;
 391         } else if (attr == &dev_attr_gt_RPn_freq_mhz) {
 392                 val = ((rp_state_cap & 0xff0000) >> 16) * GT_FREQUENCY_MULTIPLIER;
 393         } else {
 394                 BUG();
 395         }
 396         return snprintf(buf, PAGE_SIZE, "%d\n", val);
 397 }
 398
 399 static const struct attribute *gen6_attrs[] = {
 400         &dev_attr_gt_cur_freq_mhz.attr,
 401         &dev_attr_gt_max_freq_mhz.attr,
 402         &dev_attr_gt_min_freq_mhz.attr,
 403         &dev_attr_gt_RP0_freq_mhz.attr,
 404         &dev_attr_gt_RP1_freq_mhz.attr,
 405         &dev_attr_gt_RPn_freq_mhz.attr,
 406         NULL,
 407 };
 408
 409 void i915_setup_sysfs(struct drm_device *dev)
 410 {
 411         int ret;
 412
 413 #ifdef CONFIG_PM
 414         if (INTEL_INFO(dev)->gen >= 6) {
 415                 ret = sysfs_merge_group(&dev->primary->kdev.kobj,
 416                                         &rc6_attr_group);
 417                 if (ret)
 418                         DRM_ERROR("RC6 residency sysfs setup failed\n");
 419         }
 420 #endif
 421         if (HAS_L3_GPU_CACHE(dev)) {
 422                 ret = device_create_bin_file(&dev->primary->kdev, &dpf_attrs);
 423                 if (ret)
 424                         DRM_ERROR("l3 parity sysfs setup failed\n");
 425         }
 426
 427         if (INTEL_INFO(dev)->gen >= 6) {
 428                 ret = sysfs_create_files(&dev->primary->kdev.kobj, gen6_attrs);
 429                 if (ret)
 430                         DRM_ERROR("gen6 sysfs setup failed\n");
 431         }
 432 }
 433
 434 void i915_teardown_sysfs(struct drm_device *dev)
 435 {
 436         sysfs_remove_files(&dev->primary->kdev.kobj, gen6_attrs);
 437         device_remove_bin_file(&dev->primary->kdev,  &dpf_attrs);
 438 #ifdef CONFIG_PM
 439         sysfs_unmerge_group(&dev->primary->kdev.kobj, &rc6_attr_group);
 440 #endif
 441 }