• Dan Williams's avatar
    [SCSI] libsas: sgpio write support · 8ec6552f
    Dan Williams authored
    Add SFF-8485 v0.7 / SAS-1 smp-write-gpio register support to libsas.
    Defer SAS-2 support unless/until it defines an sgpio interface.
    
    Minimum implementation needed to get the lights blinking.
    try_test_sas_gpio_gp_bit() provides a common method to parse the
    incoming write data (raw bitstream), and the to_sas_gpio_gp_bit() helper
    routine can be used as a basis for the set/clear operations for the
    'read' implementation.  Host implementations parse as many bits
    (ODx.[012]) as are locally supported and report the number of registers
    successfully written.  If the submitted data overruns the internal
    number of registers available report the write as a success with the
    number of bytes remaining reported in ->resid_len.
    
    Example (assuming an active backplane) set the "identify" pattern for
    the first 21 devices:
    
    smp_write_gpio --count=2 --data=92,49,24,92,24,92,49,24 -t 4 --index=1 /dev/bsg/sas_hostX
    Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
    Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
    8ec6552f
sas.h 11.8 KB