iommu/amd: Add support for device id user input

Browse source

Dumping IOMMU data structures like device table, IRT, etc., for all devices
on the system will be a lot of data dumped in a file. Also, user may want
to dump and analyze these data structures just for one or few devices. So
dumping IOMMU data structures like device table, IRT etc for all devices
is not a good approach.

Add "device id" user input to be used for dumping IOMMU data structures
like device table, IRT etc in AMD IOMMU debugfs.

eg.
1. # echo 0000:01:00.0 > /sys/kernel/debug/iommu/amd/devid
   # cat /sys/kernel/debug/iommu/amd/devid
   Output : 0000:01:00.0

2. # echo 01:00.0 > /sys/kernel/debug/iommu/amd/devid
   # cat /sys/kernel/debug/iommu/amd/devid
   Output : 0000:01:00.0

Signed-off-by: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@amd.com>
Reviewed-by: Vasant Hegde <vasant.hegde@amd.com>
Link: https://lore.kernel.org/r/20250702093804.849-6-dheerajkumar.srivastava@amd.com
Signed-off-by: Will Deacon <will@kernel.org>

...

This commit is contained in:

Dheeraj Kumar Srivastava 2025-07-02 15:08:01 +05:30 • committed by Will Deacon

parent fb3af1f4fe

commit 2e98940f12

1 changed files with 80 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

80

drivers/iommu/amd/debugfs.c

View file