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 #endif
  97
  98 static int l3_access_valid(struct drm_device *dev, loff_t offset)
  99 {
 100         if (!IS_IVYBRIDGE(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->mm.l3_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->mm.l3_remap_info = temp;
 186
 187         memcpy(dev_priv->mm.l3_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 void i915_setup_sysfs(struct drm_device *dev)
 207 {
 208         int ret;
 209
 210 #ifdef CONFIG_PM
 211         if (INTEL_INFO(dev)->gen >= 6) {
 212                 ret = sysfs_merge_group(&dev->primary->kdev.kobj,
 213                                         &rc6_attr_group);
 214                 if (ret)
 215                         DRM_ERROR("RC6 residency sysfs setup failed\n");
 216         }
 217 #endif
 218         if (HAS_L3_GPU_CACHE(dev)) {
 219                 ret = device_create_bin_file(&dev->primary->kdev, &dpf_attrs);
 220                 if (ret)
 221                         DRM_ERROR("l3 parity sysfs setup failed\n");
 222         }
 223 }
 224
 225 void i915_teardown_sysfs(struct drm_device *dev)
 226 {
 227         device_remove_bin_file(&dev->primary->kdev,  &dpf_attrs);
 228         sysfs_unmerge_group(&dev->primary->kdev.kobj, &rc6_attr_group);
 229 }