The SAS transport class ABI is currently undocumented. Some systemd issues have been raised for SAS device support [1], [2]. Because of this, distros using systemd may have broken symlinks, like /dev/disk/by-path Unfortunately it is challenging to support SAS devices as the ABI is not well documented and is not always intuitive, so add a stable ABI definition. [1] https://github.com/systemd/systemd/issues/3943#issuecomment-240982482 [2] https://github.com/systemd/systemd/issues/7157 Signed-off-by: John Garry <john.garry@xxxxxxxxxx> -- I am sending this as an incomplete RFC to ensure it's the right thing to do, so I don't bother writing the document to find it later rejected. For now, this is just a minimal effort. diff --git a/Documentation/ABI/stable/sysfs-transport-sas b/Documentation/ABI/stable/sysfs-transport-sas new file mode 100644 index 0000000..6df6ffe --- /dev/null +++ b/Documentation/ABI/stable/sysfs-transport-sas @@ -0,0 +1,21 @@ +What: /sys/class/sas_phy/phy-<host>:<phy identifier>, + phy-<host>:<scsi target id>:<phy identifier> +Date: Nov, 2018 +KernelVersion: 2.6.13 +Contact: linux-scsi@xxxxxxxxxxxxxxx +Description: SAS PHY entry directory, which includes interfaces to control + the PHY, physical layer information on the PHY, and other SAS + fabric management information asscoiated with the PHY. + +What: /sys/class/sas_port/port-<host>:<port identifier>, + port-<host>:<scsi target id>:<port identifier> +Date: Nov, 2018 +KernelVersion: 2.6.13 +Contact: linux-scsi@xxxxxxxxxxxxxxx +Description: SAS Port entry directory, with constituient PHY count and + other SAS fabric management information asscoiated with the + Port. + + + + -- 1.9.1
