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4a60406d35
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>
30 lines
1.5 KiB
Text
30 lines
1.5 KiB
Text
What: /sys/bus/platform/devices/.../driver_override
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Date: April 2014
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Contact: Kim Phillips <kim.phillips@freescale.com>
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Description:
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This file allows the driver for a device to be specified which
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will override standard OF, ACPI, ID table, and name matching.
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When specified, only a driver with a name matching the value
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written to driver_override will have an opportunity to bind
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to the device. The override is specified by writing a string
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to the driver_override file (echo vfio-platform > \
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driver_override) and may be cleared with an empty string
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(echo > driver_override). This returns the device to standard
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matching rules binding. Writing to driver_override does not
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automatically unbind the device from its current driver or make
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any attempt to automatically load the specified driver. If no
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driver with a matching name is currently loaded in the kernel,
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the device will not bind to any driver. This also allows
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devices to opt-out of driver binding using a driver_override
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name such as "none". Only a single driver may be specified in
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the override, there is no support for parsing delimiters.
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What: /sys/bus/platform/devices/.../numa_node
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Date: June 2020
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Contact: Barry Song <song.bao.hua@hisilicon.com>
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Description:
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This file contains the NUMA node to which the platform device
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is attached. It won't be visible if the node is unknown. The
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value comes from an ACPI _PXM method or a similar firmware
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source. Initial users for this file would be devices like
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arm smmu which are populated by arm64 acpi_iort.
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