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    [SCSI] implement runtime Power Management · bc4f2401
    Alan Stern 提交于
    This patch (as1398b) adds runtime PM support to the SCSI layer.  Only
    the machanism is provided; use of it is up to the various high-level
    drivers, and the patch doesn't change any of them.  Except for sg --
    the patch expicitly prevents a device from being runtime-suspended
    while its sg device file is open.
    
    The implementation is simplistic.  In general, hosts and targets are
    automatically suspended when all their children are asleep, but for
    them the runtime-suspend code doesn't actually do anything.  (A host's
    runtime PM status is propagated up the device tree, though, so a
    runtime-PM-aware lower-level driver could power down the host adapter
    hardware at the appropriate times.)  There are comments indicating
    where a transport class might be notified or some other hooks added.
    
    LUNs are runtime-suspended by calling the drivers' existing suspend
    handlers (and likewise for runtime-resume).  Somewhat arbitrarily, the
    implementation delays for 100 ms before suspending an eligible LUN.
    This is because there typically are occasions during bootup when the
    same device file is opened and closed several times in quick
    succession.
    
    The way this all works is that the SCSI core increments a device's
    PM-usage count when it is registered.  If a high-level driver does
    nothing then the device will not be eligible for runtime-suspend
    because of the elevated usage count.  If a high-level driver wants to
    use runtime PM then it can call scsi_autopm_put_device() in its probe
    routine to decrement the usage count and scsi_autopm_get_device() in
    its remove routine to restore the original count.
    
    Hosts, targets, and LUNs are not suspended while they are being probed
    or removed, or while the error handler is running.  In fact, a fairly
    large part of the patch consists of code to make sure that things
    aren't suspended at such times.
    
    [jejb: fix up compile issues in PM config variations]
    Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
    Signed-off-by: NJames Bottomley <James.Bottomley@suse.de>
    bc4f2401
scsi_scan.c 54.2 KB