Niklas Schnelle 408f2c9c15 s390/pci: expose UID uniqueness guarantee ... On s390 each PCI device has a user-defined ID (UID) exposed under /sys/bus/pci/devices/<dev>/uid. This ID was designed to serve as the PCI device's primary index and to match the device within Linux to the device configured in the hypervisor. To serve as a primary identifier the UID must be unique within the Linux instance, this is guaranteed by the platform if and only if the UID Uniqueness Checking flag is set within the CLP List PCI Functions response. While the UID has been exposed to userspace since commit ac4995b9d5 ("s390/pci: add some new arch specific pci attributes") whether or not the platform guarantees its uniqueness for the lifetime of the Linux instance while defined is not visible from userspace. Remedy this by exposing this as a per device attribute at /sys/bus/pci/devices/<dev>/uid_is_unique Keeping this a per device attribute allows for maximum flexibility if we ever end up with some devices not having a UID or not enjoying the guaranteed uniqueness. Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com> Reviewed-by: Viktor Mihajlovski <mihajlov@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.com>		2021-04-05 11:30:57 +02:00
..
3270.ChangeLog	Documentation: Use "while" instead of "whilst"	2018-11-20 09:30:43 -07:00
3270.rst	docs: s390: convert docs to ReST and rename to *.rst	2019-06-11 09:48:14 +02:00
cds.rst	docs: s390: convert docs to ReST and rename to *.rst	2019-06-11 09:48:14 +02:00
common_io.rst	docs: s390: convert docs to ReST and rename to *.rst	2019-06-11 09:48:14 +02:00
config3270.sh
driver-model.rst	docs: s390: convert docs to ReST and rename to *.rst	2019-06-11 09:48:14 +02:00
features.rst	docs: archis: add a per-architecture features list	2020-12-03 15:10:15 -07:00
index.rst	docs: archis: add a per-architecture features list	2020-12-03 15:10:15 -07:00
monreader.rst	S390: Replace HTTP links with HTTPS ones	2020-07-13 11:33:14 -06:00
pci.rst	s390/pci: expose UID uniqueness guarantee	2021-04-05 11:30:57 +02:00
qeth.rst	docs: s390: convert docs to ReST and rename to *.rst	2019-06-11 09:48:14 +02:00
s390dbf.rst	s390/debug: remove raw view	2020-06-29 16:32:20 +02:00
text_files.rst	docs: s390: convert docs to ReST and rename to *.rst	2019-06-11 09:48:14 +02:00
vfio-ap.rst	Documentation: s390/vfio-ap: eliminate duplicated word	2020-07-13 09:44:07 -06:00
vfio-ccw.rst	vfio-ccw: Introduce a new CRW region	2020-06-03 11:27:43 +02:00
zfcpdump.rst	Documentation/s390: Update / remove developerWorks web links	2020-05-20 10:22:51 +02:00