linux-kernel - Re: [PATCH] selftest: drivers: Add support to check duplicate hwirq

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Message-ID: <533eb948-a061-4d62-8d89-5edbdaf785e6@nvidia.com>
Date: Fri, 18 Oct 2024 12:29:58 +0800
From: Joseph Jang <jjang@...dia.com>
To: shuah@...nel.org, tglx@...utronix.de, helgaas@...nel.org,
 mochs@...dia.com, linux-kernel@...r.kernel.org,
 linux-kselftest@...r.kernel.org
Cc: linux-tegra@...r.kernel.org
Subject: Re: [PATCH] selftest: drivers: Add support to check duplicate hwirq



On 2024/9/4 9:44 AM, Joseph Jang wrote:
> Validate there are no duplicate hwirq from the irq debug
> file system /sys/kernel/debug/irq/irqs/* per chip name.
> 
> One example log show 2 duplicated hwirq in the irq debug
> file system.
> 
> $ sudo cat /sys/kernel/debug/irq/irqs/163
> handler:  handle_fasteoi_irq
> device:   0019:00:00.0
>       <SNIP>
> node:     1
> affinity: 72-143
> effectiv: 76
> domain:  irqchip@...000100022040000-3
>   hwirq:   0xc8000000
>   chip:    ITS-MSI
>    flags:   0x20
> 
> $ sudo cat /sys/kernel/debug/irq/irqs/174
> handler:  handle_fasteoi_irq
> device:   0039:00:00.0
>      <SNIP>
> node:     3
> affinity: 216-287
> effectiv: 221
> domain:  irqchip@...000300022040000-3
>   hwirq:   0xc8000000
>   chip:    ITS-MSI
>    flags:   0x20
> 
> The irq-check.sh can help to collect hwirq and chip name from
> /sys/kernel/debug/irq/irqs/* and print error log when find duplicate
> hwirq per chip name.
> 
> Kernel patch ("PCI/MSI: Fix MSI hwirq truncation") [1] fix above issue.
> [1]: https://lore.kernel.org/all/20240115135649.708536-1-vidyas@nvidia.com/
> 
> Signed-off-by: Joseph Jang <jjang@...dia.com>
> Reviewed-by: Matthew R. Ochs <mochs@...dia.com>
> ---
>   tools/testing/selftests/drivers/irq/Makefile  |  5 +++
>   tools/testing/selftests/drivers/irq/config    |  2 +
>   .../selftests/drivers/irq/irq-check.sh        | 39 +++++++++++++++++++
>   3 files changed, 46 insertions(+)
>   create mode 100644 tools/testing/selftests/drivers/irq/Makefile
>   create mode 100644 tools/testing/selftests/drivers/irq/config
>   create mode 100755 tools/testing/selftests/drivers/irq/irq-check.sh
> 
> diff --git a/tools/testing/selftests/drivers/irq/Makefile b/tools/testing/selftests/drivers/irq/Makefile
> new file mode 100644
> index 000000000000..d6998017c861
> --- /dev/null
> +++ b/tools/testing/selftests/drivers/irq/Makefile
> @@ -0,0 +1,5 @@
> +# SPDX-License-Identifier: GPL-2.0
> +
> +TEST_PROGS := irq-check.sh
> +
> +include ../../lib.mk
> diff --git a/tools/testing/selftests/drivers/irq/config b/tools/testing/selftests/drivers/irq/config
> new file mode 100644
> index 000000000000..a53d3b713728
> --- /dev/null
> +++ b/tools/testing/selftests/drivers/irq/config
> @@ -0,0 +1,2 @@
> +CONFIG_GENERIC_IRQ_DEBUGFS=y
> +CONFIG_GENERIC_IRQ_INJECTION=y
> diff --git a/tools/testing/selftests/drivers/irq/irq-check.sh b/tools/testing/selftests/drivers/irq/irq-check.sh
> new file mode 100755
> index 000000000000..e784777043a1
> --- /dev/null
> +++ b/tools/testing/selftests/drivers/irq/irq-check.sh
> @@ -0,0 +1,39 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0
> +
> +# This script need root permission
> +uid=$(id -u)
> +if [ $uid -ne 0 ]; then
> +	echo "SKIP: Must be run as root"
> +	exit 4
> +fi
> +
> +# Ensure debugfs is mounted
> +mount -t debugfs nodev /sys/kernel/debug 2>/dev/null
> +if [ ! -d "/sys/kernel/debug/irq/irqs" ]; then
> +	echo "SKIP: irq debugfs not found"
> +	exit 4
> +fi
> +
> +# Traverse the irq debug file system directory to collect chip_name and hwirq
> +hwirq_list=$(for irq_file in /sys/kernel/debug/irq/irqs/*; do
> +	# Read chip name and hwirq from the irq_file
> +	chip_name=$(cat "$irq_file" | grep -m 1 'chip:' | awk '{print $2}')
> +	hwirq=$(cat "$irq_file" | grep -m 1 'hwirq:' | awk '{print $2}' )
> +
> +	if [ -z "$chip_name" ] || [ -z "$hwirq" ]; then
> +		continue
> +	fi
> +
> +	echo "$chip_name $hwirq"
> +done)
> +
> +dup_hwirq_list=$(echo "$hwirq_list" | sort | uniq -cd)
> +
> +if [ -n "$dup_hwirq_list" ]; then
> +	echo "ERROR: Found duplicate hwirq"
> +	echo "$dup_hwirq_list"
> +	exit 1
> +fi
> +
> +exit 0

Hi Tglx,

I follow your suggestions 
https://www.mail-archive.com/linux-kselftest@vger.kernel.org/msg16952.html 
to enable IRQ DEBUG_FS and create a new script to scan duplicated hwirq. 
If you have available time, would you please help to take a look at new 
patch again ?


https://lore.kernel.org/all/20240904014426.3404397-1-jjang@nvidia.com/T/


Hi Shuah,

If you have time, could you help to take a look at the new patch ?


Thank you,
Joseph.