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driver core: platform: expose numa_node to users in sysfs

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Some platform devices like ARM SMMU are memory-mapped and populated by ACPI/IORT.
In this case, NUMA topology of those platform devices are exported by firmware as
well. Software might care about the numa_node of those devices in order to achieve
NUMA locality.
This patch will show the numa_node for this kind of devices in sysfs. For those
platform devices without numa, numa_node won't be visible.

Cc: Prime Zeng <prime.zeng@hisilicon.com>
Cc: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Link: https://lore.kernel.org/r/20200619030045.81956-1-song.bao.hua@hisilicon.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Barry Song
2020-06-19 15:00:45 +12:00
committed by Greg Kroah-Hartman
parent 079ad2fb4b
commit 4a60406d35
2 changed files with 35 additions and 1 deletions
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10
Documentation/ABI/testing/sysfs-bus-platform
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@@ -18,3 +18,13 @@ Description:
devices to opt-out of driver binding using a driver_override
name such as "none". Only a single driver may be specified in
the override, there is no support for parsing delimiters.
What: /sys/bus/platform/devices/.../numa_node
Date: June 2020
Contact: Barry Song <song.bao.hua@hisilicon.com>
Description:
This file contains the NUMA node to which the platform device
is attached. It won't be visible if the node is unknown. The
value comes from an ACPI _PXM method or a similar firmware
source. Initial users for this file would be devices like
arm smmu which are populated by arm64 acpi_iort.