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 "i915_drv.h"
 33
 34#ifdef CONFIG_PM
 35static 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
 47static ssize_t
 48show_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
 54static ssize_t
 55show_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
 62static ssize_t
 63show_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
 70static ssize_t
 71show_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
 78static DEVICE_ATTR(rc6_enable, S_IRUGO, show_rc6_mask, NULL);
 79static DEVICE_ATTR(rc6_residency_ms, S_IRUGO, show_rc6_ms, NULL);
 80static DEVICE_ATTR(rc6p_residency_ms, S_IRUGO, show_rc6p_ms, NULL);
 81static DEVICE_ATTR(rc6pp_residency_ms, S_IRUGO, show_rc6pp_ms, NULL);
 82
 83static 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
 91static struct attribute_group rc6_attr_group = {
 92	.name = power_group_name,
 93	.attrs =  rc6_attrs
 94};
 95
 96void i915_setup_sysfs(struct drm_device *dev)
 97{
 98	int ret;
 99
100	/* ILK doesn't have any residency information */
101	if (INTEL_INFO(dev)->gen < 6)
102		return;
103
104	ret = sysfs_merge_group(&dev->primary->kdev.kobj, &rc6_attr_group);
105	if (ret)
106		DRM_ERROR("sysfs setup failed\n");
107}
108
109void i915_teardown_sysfs(struct drm_device *dev)
110{
111	sysfs_unmerge_group(&dev->primary->kdev.kobj, &rc6_attr_group);
112}
113#else
114void i915_setup_sysfs(struct drm_device *dev)
115{
116	return;
117}
118
119void i915_teardown_sysfs(struct drm_device *dev)
120{
121	return;
122}
123#endif /* CONFIG_PM */