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 *dev, struct device_attribute *attr, char *buf)
  50 {
  51         struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
  52         return snprintf(buf, PAGE_SIZE, "%x", intel_enable_rc6(dminor->dev));
  53 }
  54
  55 static ssize_t
  56 show_rc6_ms(struct device *dev, struct device_attribute *attr, char *buf)
  57 {
  58         struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
  59         u32 rc6_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6);
  60         return snprintf(buf, PAGE_SIZE, "%u", rc6_residency);
  61 }
  62
  63 static ssize_t
  64 show_rc6p_ms(struct device *dev, struct device_attribute *attr, char *buf)
  65 {
  66         struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
  67         u32 rc6p_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6p);
  68         return snprintf(buf, PAGE_SIZE, "%u", rc6p_residency);
  69 }
  70
  71 static ssize_t
  72 show_rc6pp_ms(struct device *dev, struct device_attribute *attr, char *buf)
  73 {
  74         struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
  75         u32 rc6pp_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6pp);
  76         return snprintf(buf, PAGE_SIZE, "%u", 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
  97 static int l3_access_valid(struct drm_device *dev, loff_t offset)
  98 {
  99         if (!IS_IVYBRIDGE(dev))
 100                 return -EPERM;
 101
 102         if (offset % 4 != 0)
 103                 return -EINVAL;
 104
 105         if (offset >= GEN7_L3LOG_SIZE)
 106                 return -ENXIO;
 107
 108         return 0;
 109 }
 110
 111 static ssize_t
 112 i915_l3_read(struct file *filp, struct kobject *kobj,
 113              struct bin_attribute *attr, char *buf,
 114              loff_t offset, size_t count)
 115 {
 116         struct device *dev = container_of(kobj, struct device, kobj);
 117         struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
 118         struct drm_device *drm_dev = dminor->dev;
 119         struct drm_i915_private *dev_priv = drm_dev->dev_private;
 120         uint32_t misccpctl;
 121         int i, ret;
 122
 123         ret = l3_access_valid(drm_dev, offset);
 124         if (ret)
 125                 return ret;
 126
 127         ret = i915_mutex_lock_interruptible(drm_dev);
 128         if (ret)
 129                 return ret;
 130
 131         misccpctl = I915_READ(GEN7_MISCCPCTL);
 132         I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);
 133
 134         for (i = offset; count >= 4 && i < GEN7_L3LOG_SIZE; i += 4, count -= 4)
 135                 *((uint32_t *)(&buf[i])) = I915_READ(GEN7_L3LOG_BASE + i);
 136
 137         I915_WRITE(GEN7_MISCCPCTL, misccpctl);
 138
 139         mutex_unlock(&drm_dev->struct_mutex);
 140
 141         return i - offset;
 142 }
 143
 144 static ssize_t
 145 i915_l3_write(struct file *filp, struct kobject *kobj,
 146               struct bin_attribute *attr, char *buf,
 147               loff_t offset, size_t count)
 148 {
 149         struct device *dev = container_of(kobj, struct device, kobj);
 150         struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
 151         struct drm_device *drm_dev = dminor->dev;
 152         struct drm_i915_private *dev_priv = drm_dev->dev_private;
 153         u32 *temp = NULL; /* Just here to make handling failures easy */
 154         int ret;
 155
 156         ret = l3_access_valid(drm_dev, offset);
 157         if (ret)
 158                 return ret;
 159
 160         ret = i915_mutex_lock_interruptible(drm_dev);
 161         if (ret)
 162                 return ret;
 163
 164         if (!dev_priv->mm.l3_remap_info) {
 165                 temp = kzalloc(GEN7_L3LOG_SIZE, GFP_KERNEL);
 166                 if (!temp) {
 167                         mutex_unlock(&drm_dev->struct_mutex);
 168                         return -ENOMEM;
 169                 }
 170         }
 171
 172         ret = i915_gpu_idle(drm_dev);
 173         if (ret) {
 174                 kfree(temp);
 175                 mutex_unlock(&drm_dev->struct_mutex);
 176                 return ret;
 177         }
 178
 179         /* TODO: Ideally we really want a GPU reset here to make sure errors
 180          * aren't propagated. Since I cannot find a stable way to reset the GPU
 181          * at this point it is left as a TODO.
 182         */
 183         if (temp)
 184                 dev_priv->mm.l3_remap_info = temp;
 185
 186         memcpy(dev_priv->mm.l3_remap_info + (offset/4),
 187                buf + (offset/4),
 188                count);
 189
 190         i915_gem_l3_remap(drm_dev);
 191
 192         mutex_unlock(&drm_dev->struct_mutex);
 193
 194         return count;
 195 }
 196
 197 static struct bin_attribute dpf_attrs = {
 198         .attr = {.name = "l3_parity", .mode = (S_IRUSR | S_IWUSR)},
 199         .size = GEN7_L3LOG_SIZE,
 200         .read = i915_l3_read,
 201         .write = i915_l3_write,
 202         .mmap = NULL
 203 };
 204
 205 void i915_setup_sysfs(struct drm_device *dev)
 206 {
 207         int ret;
 208
 209         if (INTEL_INFO(dev)->gen >= 6) {
 210                 ret = sysfs_merge_group(&dev->primary->kdev.kobj,
 211                                         &rc6_attr_group);
 212                 if (ret)
 213                         DRM_ERROR("RC6 residency sysfs setup failed\n");
 214         }
 215
 216         if (IS_IVYBRIDGE(dev)) {
 217                 ret = device_create_bin_file(&dev->primary->kdev, &dpf_attrs);
 218                 if (ret)
 219                         DRM_ERROR("l3 parity sysfs setup failed\n");
 220         }
 221 }
 222
 223 void i915_teardown_sysfs(struct drm_device *dev)
 224 {
 225         device_remove_bin_file(&dev->primary->kdev,  &dpf_attrs);
 226         sysfs_unmerge_group(&dev->primary->kdev.kobj, &rc6_attr_group);
 227 }
 228 #else
 229 void i915_setup_sysfs(struct drm_device *dev)
 230 {
 231         return;
 232 }
 233
 234 void i915_teardown_sysfs(struct drm_device *dev)
 235 {
 236         return;
 237 }
 238 #endif /* CONFIG_PM */