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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 | static u32 calc_residency(struct drm_device *dev, const u32 reg) | |
35 | { | |
36 | struct drm_i915_private *dev_priv = dev->dev_private; | |
37 | u64 raw_time; /* 32b value may overflow during fixed point math */ | |
38 | ||
39 | if (!intel_enable_rc6(dev)) | |
40 | return 0; | |
41 | ||
42 | raw_time = I915_READ(reg) * 128ULL + 500; | |
43 | return do_div(raw_time, 100000); | |
44 | } | |
45 | ||
46 | static ssize_t | |
47 | show_rc6_mask(struct device *dev, struct device_attribute *attr, char *buf) | |
48 | { | |
49 | struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev); | |
50 | return snprintf(buf, PAGE_SIZE, "%x", intel_enable_rc6(dminor->dev)); | |
51 | } | |
52 | ||
53 | static ssize_t | |
54 | show_rc6_ms(struct device *dev, struct device_attribute *attr, char *buf) | |
55 | { | |
56 | struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev); | |
57 | u32 rc6_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6); | |
58 | return snprintf(buf, PAGE_SIZE, "%u", rc6_residency); | |
59 | } | |
60 | ||
61 | static ssize_t | |
62 | show_rc6p_ms(struct device *dev, struct device_attribute *attr, char *buf) | |
63 | { | |
64 | struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev); | |
65 | u32 rc6p_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6p); | |
66 | return snprintf(buf, PAGE_SIZE, "%u", rc6p_residency); | |
67 | } | |
68 | ||
69 | static ssize_t | |
70 | show_rc6pp_ms(struct device *dev, struct device_attribute *attr, char *buf) | |
71 | { | |
72 | struct drm_minor *dminor = container_of(dev, struct drm_minor, kdev); | |
73 | u32 rc6pp_residency = calc_residency(dminor->dev, GEN6_GT_GFX_RC6pp); | |
74 | return snprintf(buf, PAGE_SIZE, "%u", rc6pp_residency); | |
75 | } | |
76 | ||
77 | static DEVICE_ATTR(rc6_enable, S_IRUGO, show_rc6_mask, NULL); | |
78 | static DEVICE_ATTR(rc6_residency_ms, S_IRUGO, show_rc6_ms, NULL); | |
79 | static DEVICE_ATTR(rc6p_residency_ms, S_IRUGO, show_rc6p_ms, NULL); | |
80 | static DEVICE_ATTR(rc6pp_residency_ms, S_IRUGO, show_rc6pp_ms, NULL); | |
81 | ||
82 | static struct attribute *rc6_attrs[] = { | |
83 | &dev_attr_rc6_enable.attr, | |
84 | &dev_attr_rc6_residency_ms.attr, | |
85 | &dev_attr_rc6p_residency_ms.attr, | |
86 | &dev_attr_rc6pp_residency_ms.attr, | |
87 | NULL | |
88 | }; | |
89 | ||
90 | static struct attribute_group rc6_attr_group = { | |
91 | .name = power_group_name, | |
92 | .attrs = rc6_attrs | |
93 | }; | |
94 | ||
95 | void i915_setup_sysfs(struct drm_device *dev) | |
96 | { | |
97 | int ret; | |
98 | ||
99 | /* ILK doesn't have any residency information */ | |
100 | if (INTEL_INFO(dev)->gen < 6) | |
101 | return; | |
102 | ||
103 | ret = sysfs_merge_group(&dev->primary->kdev.kobj, &rc6_attr_group); | |
104 | if (ret) | |
105 | DRM_ERROR("sysfs setup failed\n"); | |
106 | } | |
107 | ||
108 | void i915_teardown_sysfs(struct drm_device *dev) | |
109 | { | |
110 | sysfs_unmerge_group(&dev->primary->kdev.kobj, &rc6_attr_group); | |
111 | } |