1. 28 Oct, 2005 1 commit
  2. 09 Sep, 2005 1 commit
    • Christoph Hellwig's avatar
      [SCSI] SAS transport class · c7ebbbce
      Christoph Hellwig authored
      The SAS transport class contains common code to deal with SAS HBAs, an
      aproximated representation of SAS topologies in the driver model,
      and various sysfs attributes to expose these topologies and managment
      interfaces to userspace.
      
      In addition to the basic SCSI core objects this transport class introduces
      two additional intermediate objects:  The SAS PHY as represented by struct
      sas_phy defines an "outgoing" PHY on a SAS HBA or Expander, and the SAS
      remote PHY represented by struct sas_rphy defines an "incoming" PHY on a
      SAS Expander or end device.  Note that this is purely a software concept, the
      underlying hardware for a PHY and a remote PHY is the exactly the same.
      
      There is no concept of a SAS port in this code, users can see what PHYs
      form a wide port based on the port_identifier attribute, which is the same
      for all PHYs in a port.
      
      This submission doesn't handle hot-plug addition or removal of SAS devices
      and thus doesn't do scanning in a workqueue yet, that will be added in
      phase2 after this submission.  In a third phase I will add additional
      managment infrastructure.
      
      I think this submission is ready for 2.6.14, but additional comments are
      of course very welcome.
      
      I'd like to thanks James Smart a lot for his very useful input on the
      design.
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
      c7ebbbce