tools/testing/selftests/pcie_bwctrl/set_pcie_cooling_state.sh

Source file repositories/reference/linux-study-clean/tools/testing/selftests/pcie_bwctrl/set_pcie_cooling_state.sh

File Facts

System
Linux kernel
Corpus path
tools/testing/selftests/pcie_bwctrl/set_pcie_cooling_state.sh
Extension
.sh
Size
2275 bytes
Lines
123
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: tools
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.

Dependency Surface

Detected Declarations

Annotated Snippet

#!/bin/bash
# SPDX-License-Identifier: GPL-2.0-or-later

SYSFS=
# Kselftest framework requirement - SKIP code is 4.
ksft_skip=4
retval=0
skipmsg="skip all tests:"

PCIEPORTTYPE="PCIe_Port_Link_Speed"

prerequisite()
{
	local ports

	if [ $UID != 0 ]; then
		echo $skipmsg must be run as root >&2
		exit $ksft_skip
	fi

	SYSFS=`mount -t sysfs | head -1 | awk '{ print $3 }'`

	if [ ! -d "$SYSFS" ]; then
		echo $skipmsg sysfs is not mounted >&2
		exit $ksft_skip
	fi

	if ! ls $SYSFS/class/thermal/cooling_device* > /dev/null 2>&1; then
		echo $skipmsg thermal cooling devices missing >&2
		exit $ksft_skip
	fi

	ports=`grep -e "^$PCIEPORTTYPE" $SYSFS/class/thermal/cooling_device*/type | wc -l`
	if [ $ports -eq 0 ]; then
		echo $skipmsg pcie cooling devices missing >&2
		exit $ksft_skip
	fi
}

testport=
find_pcie_port()
{
	local patt="$1"
	local pcieports
	local max
	local cur
	local delta
	local bestdelta=-1

	pcieports=`grep -l -F -e "$patt" /sys/class/thermal/cooling_device*/type`
	if [ -z "$pcieports" ]; then
		return
	fi
	pcieports=${pcieports//\/type/}
	# Find the port with the highest PCIe Link Speed
	for port in $pcieports; do
		max=`cat $port/max_state`
		cur=`cat $port/cur_state`
		delta=$((max-cur))
		if [ $delta -gt $bestdelta ]; then
			testport="$port"
			bestdelta=$delta
		fi
	done
}

sysfspcidev=
find_sysfs_pci_dev()
{
	local typefile="$1/type"

Annotation

Implementation Notes