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