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 static u32 calc_residency(struct drm_device *dev, const u32 reg)
  36 {
  37         struct drm_i915_private *dev_priv = dev->dev_private;
  38         u64 raw_time; /* 32b value may overflow during fixed point math */
  39
  40         if (!intel_enable_rc6(dev))
  41                 return 0;
  42
  43         raw_time = I915_READ(reg) * 128ULL;
  44         return DIV_ROUND_UP_ULL(raw_time, 100000);
  45 }
  46
  47 static ssize_t
  48 show_rc6_mask(struct device *dev, struct device_attribute *attr, char *buf)
  49 {
  50         struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
  51         return snprintf(buf, PAGE_SIZE, "%x", intel_enable_rc6(dminor->dev));
  52 }
  53
  54 static ssize_t
  55 show_rc6_ms(struct device *dev, struct device_attribute *attr, char *buf)
  56 {
  57         struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
  58         u32 rc6_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6);
  59         return snprintf(buf, PAGE_SIZE, "%u", rc6_residency);
  60 }
  61
  62 static ssize_t
  63 show_rc6p_ms(struct device *dev, struct device_attribute *attr, char *buf)
  64 {
  65         struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
  66         u32 rc6p_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6p);
  67         return snprintf(buf, PAGE_SIZE, "%u", rc6p_residency);
  68 }
  69
  70 static ssize_t
  71 show_rc6pp_ms(struct device *dev, struct device_attribute *attr, char *buf)
  72 {
  73         struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
  74         u32 rc6pp_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6pp);
  75         return snprintf(buf, PAGE_SIZE, "%u", rc6pp_residency);
  76 }
  77
  78 static DEVICE_ATTR(rc6_enable, S_IRUGO, show_rc6_mask, NULL);
  79 static DEVICE_ATTR(rc6_residency_ms, S_IRUGO, show_rc6_ms, NULL);
  80 static DEVICE_ATTR(rc6p_residency_ms, S_IRUGO, show_rc6p_ms, NULL);
  81 static DEVICE_ATTR(rc6pp_residency_ms, S_IRUGO, show_rc6pp_ms, NULL);
  82
  83 static struct attribute *rc6_attrs[] = {
  84         &dev_attr_rc6_enable.attr,
  85         &dev_attr_rc6_residency_ms.attr,
  86         &dev_attr_rc6p_residency_ms.attr,
  87         &dev_attr_rc6pp_residency_ms.attr,
  88         NULL
  89 };
  90
  91 static struct attribute_group rc6_attr_group = {
  92         .name = power_group_name,
  93         .attrs =  rc6_attrs
  94 };
  95
  96 static int l3_access_valid(struct drm_device *dev, loff_t offset)
  97 {
  98         if (!IS_IVYBRIDGE(dev))
  99                 return -EPERM;
 100
 101         if (offset % 4 != 0)
 102                 return -EINVAL;
 103
 104         if (offset >= GEN7_L3LOG_SIZE)
 105                 return -ENXIO;
 106
 107         return 0;
 108 }
 109
 110 static ssize_t
 111 i915_l3_read(struct file *filp, struct kobject *kobj,
 112              struct bin_attribute *attr, char *buf,
 113              loff_t offset, size_t count)
 114 {
 115         struct device *dev = container_of(kobj, struct device, kobj);
 116         struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
 117         struct drm_device *drm_dev = dminor->dev;
 118         struct drm_i915_private *dev_priv = drm_dev->dev_private;
 119         uint32_t misccpctl;
 120         int i, ret;
 121
 122         ret = l3_access_valid(drm_dev, offset);
 123         if (ret)
 124                 return ret;
 125
 126         ret = i915_mutex_lock_interruptible(drm_dev);
 127         if (ret)
 128                 return ret;
 129
 130         misccpctl = I915_READ(GEN7_MISCCPCTL);
 131         I915_WRITE(GEN7_MISCCPCTL, misccpctl & ~GEN7_DOP_CLOCK_GATE_ENABLE);
 132
 133         for (i = offset; count >= 4 && i < GEN7_L3LOG_SIZE; i += 4, count -= 4)
 134                 *((uint32_t *)(&buf[i])) = I915_READ(GEN7_L3LOG_BASE + i);
 135
 136         I915_WRITE(GEN7_MISCCPCTL, misccpctl);
 137
 138         mutex_unlock(&drm_dev->struct_mutex);
 139
 140         return i - offset;
 141 }
 142
 143 static ssize_t
 144 i915_l3_write(struct file *filp, struct kobject *kobj,
 145               struct bin_attribute *attr, char *buf,
 146               loff_t offset, size_t count)
 147 {
 148         struct device *dev = container_of(kobj, struct device, kobj);
 149         struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev);
 150         struct drm_device *drm_dev = dminor->dev;
 151         struct drm_i915_private *dev_priv = drm_dev->dev_private;
 152         u32 *temp = NULL; /* Just here to make handling failures easy */
 153         int ret;
 154
 155         ret = l3_access_valid(drm_dev, offset);
 156         if (ret)
 157                 return ret;
 158
 159         ret = i915_mutex_lock_interruptible(drm_dev);
 160         if (ret)
 161                 return ret;
 162
 163         if (!dev_priv->mm.l3_remap_info) {
 164                 temp = kzalloc(GEN7_L3LOG_SIZE, GFP_KERNEL);
 165                 if (!temp) {
 166                         mutex_unlock(&drm_dev->struct_mutex);
 167                         return -ENOMEM;
 168                 }
 169         }
 170
 171         ret = i915_gpu_idle(drm_dev);
 172         if (ret) {
 173                 kfree(temp);
 174                 mutex_unlock(&drm_dev->struct_mutex);
 175                 return ret;
 176         }
 177
 178         /* TODO: Ideally we really want a GPU reset here to make sure errors
 179          * aren't propagated. Since I cannot find a stable way to reset the GPU
 180          * at this point it is left as a TODO.
 181         */
 182         if (temp)
 183                 dev_priv->mm.l3_remap_info = temp;
 184
 185         memcpy(dev_priv->mm.l3_remap_info + (offset/4),
 186                buf + (offset/4),
 187                count);
 188
 189         i915_gem_l3_remap(drm_dev);
 190
 191         mutex_unlock(&drm_dev->struct_mutex);
 192
 193         return count;
 194 }
 195
 196 static struct bin_attribute dpf_attrs = {
 197         .attr = {.name = "l3_parity", .mode = (S_IRUSR | S_IWUSR)},
 198         .size = GEN7_L3LOG_SIZE,
 199         .read = i915_l3_read,
 200         .write = i915_l3_write,
 201         .mmap = NULL
 202 };
 203
 204 void i915_setup_sysfs(struct drm_device *dev)
 205 {
 206         int ret;
 207
 208         if (INTEL_INFO(dev)->gen >= 6) {
 209                 ret = sysfs_merge_group(&dev->primary->kdev.kobj,
 210                                         &rc6_attr_group);
 211                 if (ret)
 212                         DRM_ERROR("RC6 residency sysfs setup failed\n");
 213         }
 214
 215         if (IS_IVYBRIDGE(dev)) {
 216                 ret = device_create_bin_file(&dev->primary->kdev, &dpf_attrs);
 217                 if (ret)
 218                         DRM_ERROR("l3 parity sysfs setup failed\n");
 219         }
 220 }
 221
 222 void i915_teardown_sysfs(struct drm_device *dev)
 223 {
 224         device_remove_bin_file(&dev->primary->kdev,  &dpf_attrs);
 225         sysfs_unmerge_group(&dev->primary->kdev.kobj, &rc6_attr_group);
 226 }