blob: 4c73fe7269f331e2676632c2be467db6671319ee (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
This file documents NVIDIA Tegra specific sysfs and debugfs files and
kernel module parameters.
/sys/power/suspend/mode
-----------------------
Used to select the LP1 or LP0 power state during system suspend.
# echo lp0 > /sys/kernel/debug/suspend_mode
# echo lp1 > /sys/kernel/debug/suspend_mode
/sys/module/cpuidle/parameters/lp2_in_idle
------------------------------------------
Used to enable/disable LP2 in idle.
# echo 1 > /sys/module/cpuidle/parameters/lp2_in_idle
# echo 0 > /sys/module/cpuidle/parameters/lp2_in_idle
/sys/kernel/debug/cpuidle/lp2
-----------------------------
Contains LP2 statistics.
# cat /sys/kernel/debug/cpuidle/lp2
/sys/kernel/debug/powergate
---------------------------
Contains power gating state of different tegra blocks.
# cat /sys/kernel/debug/powergate
/sys/module/cpu_tegra3/parameters/auto_hotplug
----------------------------------------------
Used to control auto hotplug governor
# echo 0 >/sys/module/cpu_tegra3/parameters/auto_hotplug
# echo 1 >/sys/module/cpu_tegra3/parameters/auto_hotplug
# cat /sys/module/cpu_tegra3/parameters/auto_hotplug
0: disabled
1: idle
2: down
3: up
/sys/module/cpu_tegra3/parameters/no_lp
---------------------------------------
Used to enable/disable shadow cluster.
# echo 0 >/sys/module/cpu_tegra3/parameters/no_lp
# echo 1 >/sys/module/cpu_tegra3/parameters/no_lp
/sys/module/cpu_tegra3/parameters/idle_bottom_freq
--------------------------------------------------
Shadow cluster maximum frequency.
/sys/module/cpu_tegra3/parameters/idle_top_freq
-----------------------------------------------
Main cluster minimum frequency.
/sys/module/cpu_tegra3/parameters/down_delay
---------------------------------------------
Auto hotplug delay (in jiffies) for reducing cores.
/sys/module/cpu_tegra3/parameters/up2g0_delay
---------------------------------------------
Delay (in jiffies) for swithing to main cluster.
/sys/module/cpu_tegra3/parameters/up2gn_delay
---------------------------------------------
Delay (in jiffies) for bringing additional cores online in main
cluster.
/sys/module/cpu_tegra3/parameters/balance_level
-----------------------------------------------
Percentage of max speed considered to be in balance. Half of balanced
speed is considered skewed. Speed balance states:
* balanced: freq targets for all CPUs are above 50% of highest speed
* biased: freq target for at least one CPU is below 50% threshold
* skewed: freq targets for at least 2 CPUs are below 25% threshold
Speed balance state and hotplug state dictates auto hotlug behavior.
/sys/module/cpu_tegra3/parameters/mp_overhead
---------------------------------------------
Multi-core overhead percentage for EDP limit calculation.
/sys/kernel/debug/tegra_hotplug/stats
-------------------------------------
Contains hotplug statistics.
/sys/kernel/cluster/active
--------------------------
Controls active CPU cluster: main (G) or shadow (LP).
For manual control disable auto hotlug, enable immediate switch and
possibly force switch to happen always:
# echo 0 > /sys/module/cpu_tegra3/parameters/auto_hotplug
# echo 1 > /sys/kernel/cluster/immediate
# echo 1 > /sys/kernel/cluster/force
Cluster switching can happen only when only core 0 is online.
Active cluster can be set or toggled:
# echo "G" > /sys/kernel/cluster/active
# echo "LP" > /sys/kernel/cluster/active
# echo "toggle" > /sys/kernel/cluster/active
/sys/module/tegra3_clocks/parameters/detach_shared_bus
------------------------------------------------------
Enable/disable shared bus clock update.
/sys/module/tegra3_emc/parameters/emc_enable
--------------------------------------------
Enable/disable EMC DFS.
/sys/kernel/debug/tegra_emc/stats
---------------------------------
Contains EMC clock statistics.
/sys/module/tegra3_dvfs/parameters/disable_cpu
----------------------------------------------
Enable/disable DVFS for CPU domain.
/sys/module/tegra3_dvfs/parameters/disable_core
-----------------------------------------------
Enable/disable DVFS for CORE domain.
/sys/kernel/debug/clock/emc/rate
--------------------------------
Get/set EMC clock rate.
/sys/kernel/debug/clock/<module>/rate
-------------------------------------
/sys/kernel/debug/clock/<module>/parent
---------------------------------------
/sys/kernel/debug/clock/<module>/state
--------------------------------------
/sys/kernel/debug/clock/<module>/time_on
----------------------------------------
/sys/kernel/debug/clock/clock_tree
----------------------------------
Shows the state of the clock tree.
/sys/kernel/debug/clock/dvfs
----------------------------
Contains voltage state.
/sys/kernel/debug/tegra_actmon/avp/state
----------------------------------------
/sys/kernel/debug/clock/mon.avp/rate
------------------------------------
|
