Changes in sysfs-devices-removable

1f223cdb - ABI: sysfs-devices-removable: make a table valid as ReST markup

Mon, 27 Sep 2021 11:10:55 +0000

ABI: sysfs-devices-removable: make a table valid as ReST markupChangeset 70f400d4d957 ("driver core: Move the "removable" attribute from USB to core")added a table to the file, but not using a valid ReST format.Change it to avoid build issues when producing documentation with"make htmldocs".Fixes: 70f400d4d957 ("driver core: Move the "removable" attribute from USB to core")Signed-off-by: Mauro Carvalho Chehab Link: https://lore.kernel.org/r/bf83354747b8abaa486fe03af4be2826363469cb.1632740376.git.mchehab+huawei@kernel.orgSigned-off-by: Greg Kroah-Hartman List of files: /linux-6.15/Documentation/ABI/testing/sysfs-devices-removable

c037b6c8 - PCI: Add sysfs "removable" attribute

Mon, 24 May 2021 17:18:12 +0000

PCI: Add sysfs "removable" attributeA PCI device is "external_facing" if it's a Root Port with the ACPI"ExternalFacingPort" property or if it has the DT "external-facing"property. We consider everything downstream from such a device tobe removable by user.We're mainly concerned with consumer platforms with user accessibleThunderbolt ports that are vulnerable to DMA attacks, and we expect thoseports to be identified by firmware as "ExternalFacingPort". Devices intraditional hotplug slots can technically be removed, but the expectationis that unless the port is marked with "ExternalFacingPort", such devicesare less accessible to user / may not be removed by end user, and thus notexposed as "removable" to userspace.This can be used to implement userspace policies tailored foruser removable devices. Eg usage:https://chromium-review.googlesource.com/c/chromiumos/platform2/+/2591812https://chromium-review.googlesource.com/c/chromiumos/platform2/+/2795038(code uses such an attribute to remove external PCI devices or disablefeatures on them as needed by the policy desired)Acked-by: Bjorn Helgaas Signed-off-by: Rajat Jain Link: https://lore.kernel.org/r/20210524171812.18095-2-rajatja@google.comSigned-off-by: Greg Kroah-Hartman List of files: /linux-6.15/Documentation/ABI/testing/sysfs-devices-removable

70f400d4 - driver core: Move the "removable" attribute from USB to core

Mon, 24 May 2021 17:18:11 +0000

driver core: Move the "removable" attribute from USB to coreMove the "removable" attribute from USB to core in order to allow it to besupported by other subsystem / buses. Individual buses that want to supportthis attribute can populate the removable property of the device whileenumerating it with the 3 possible values - - "unknown" - "fixed" - "removable"Leaving the field unchanged (i.e. "not supported") would mean that theattribute would not show up in sysfs for that device. The UAPI (location,symantics etc) for the attribute remains unchanged.Move the "removable" attribute from USB to the device core so it can beused by other subsystems / buses.By default, devices do not have a "removable" attribute in sysfs.If a subsystem or bus driver wants to support a "removable" attribute, itshould call device_set_removable() before calling device_register() ordevice_add(), e.g.: device_set_removable(dev, DEVICE_REMOVABLE); device_register(dev);The possible values and the resulting sysfs attribute contents are: DEVICE_REMOVABLE_UNKNOWN -> "unknown" DEVICE_REMOVABLE -> "removable" DEVICE_FIXED -> "fixed"Convert the USB "removable" attribute to use this new device corefunctionality. There should be no user-visible change in the location orsemantics of attribute for USB devices.Reviewed-by: Bjorn Helgaas Signed-off-by: Rajat Jain Link: https://lore.kernel.org/r/20210524171812.18095-1-rajatja@google.comSigned-off-by: Greg Kroah-Hartman List of files: /linux-6.15/Documentation/ABI/testing/sysfs-devices-removable