1 .. SPDX-License-Identifier: GPL-2.0
2
3 ===========================
4 Low Power Idle Table (LPIT)
5 ===========================
6
7 To enumerate platform Low Power Idle states, I
8 “Low Power Idle Table” (LPIT). More detail
9 downloaded from:
10 https://www.uefi.org/sites/default/files/resou
11
12 Residencies for each low power state can be re
13 (Function fixed hardware) or a memory mapped i
14
15 On platforms supporting S0ix sleep states, the
16 residencies:
17
18 - CPU PKG C10 (Read via FFH interface)
19 - Platform Controller Hub (PCH) SLP_S0 (Read
20
21 The following attributes are added dynamically
22 sysfs attribute group::
23
24 /sys/devices/system/cpu/cpuidle/low_power_id
25 /sys/devices/system/cpu/cpuidle/low_power_id
26
27 The "low_power_idle_cpu_residency_us" attribut
28 by the CPU package in PKG C10
29
30 The "low_power_idle_system_residency_us" attri
31 residency, or system time spent with the SLP_S
32 This is the lowest possible system power state
33 PKG C10 and all functional blocks in PCH are i
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