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| author | Barry Song <song.bao.hua@hisilicon.com> | 2020-06-19 15:00:45 +1200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-10 14:14:37 +0200 |
| commit | 4a60406d3592373b8fd27ddfd010c5e62ad6c674 (patch) | |
| tree | c222443b64feee47c2db0bb8cedc8b96d3fa1c77 /Documentation/ABI/testing/sysfs-bus-platform | |
| parent | 079ad2fb4bf9eba8a0aaab014b49705cd7f07c66 (diff) | |
| download | linux-4a60406d3592373b8fd27ddfd010c5e62ad6c674.tar.gz linux-4a60406d3592373b8fd27ddfd010c5e62ad6c674.tar.bz2 linux-4a60406d3592373b8fd27ddfd010c5e62ad6c674.zip | |
driver core: platform: expose numa_node to users in sysfs
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>
Diffstat (limited to 'Documentation/ABI/testing/sysfs-bus-platform')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-platform | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-platform b/Documentation/ABI/testing/sysfs-bus-platform index 5172a6124b27..194ca700e962 100644 --- a/Documentation/ABI/testing/sysfs-bus-platform +++ b/Documentation/ABI/testing/sysfs-bus-platform @@ -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. |