Documentation/scsi/link_power_management_policy.rst

File Facts

System

Linux kernel

Corpus path

Documentation/scsi/link_power_management_policy.rst

Extension

.rst

Size

1454 bytes

Lines

37

Domain

Support Tooling And Documentation

Bucket

Documentation

Inferred role

Support Tooling And Documentation: documentation

Status

atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

• Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

.. SPDX-License-Identifier: GPL-2.0

==========================
Link Power Managent Policy
==========================

This parameter allows the user to set the link (interface) power management.
There are 6 possible options:

======================  =====================================================
Value			Effect
======================  =====================================================
min_power		Enable slumber mode(no partial mode) for the link to
			use the least possible power when possible.  This may
			sacrifice some performance due to increased latency
			when coming out of lower power states.

max_performance		Generally, this means no power management.  Tell
			the controller to have performance be a priority
			over power management.

medium_power		Tell the controller to enter a lower power state
			when possible, but do not enter the lowest power
			state, thus improving latency over min_power setting.

keep_firmware_settings	Do not change the current firmware settings for
			Power management. This is the default setting.

med_power_with_dipm	Same as medium_power, but additionally with
			Device-initiated power management(DIPM) enabled,
			as Intel Rapid Storage Technology(IRST) does.

min_power_with_partial	Same as min_power, but additionally with partial
			power state enabled, which may improve performance
			over min_power setting.
======================  =====================================================

Annotation

• Atlas domain: Support Tooling And Documentation / Documentation.
• Implementation status: atlas-only.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.