[RFC v2 PATCH 0/4]: block layer runtime pm

[Lin Ming <ming.m.lin@intel.com>]

Hi,

In August 2010, Jens and Alan discussed about "Runtime PM and the block
layer". http://marc.info/?t=128259108400001&r=1&w=2

Here are the RFC v2 patches that try to implement the ideas discussed.
And it's a workable version now.
Welcome to give it a try.

The test steps, for example

# ls -l /sys/block/sda
/sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/block/sda

# echo auto > /sys/devices/pci0000:00/0000:00:1f.2/ata1/power/control
# echo auto > /sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/power/control

Then you'll see sda is suspended after 10secs idle.

# cat /sys/devices/pci0000:00/0000:00:1f.2/ata1/host0/target0:0:0/0:0:0:0/power/runtime_status
suspended

And if you do some IO, it will resume immediately.

v2:
- remove queue idle timer, use runtime pm core's auto suspend

Lin Ming (4):
      block: add a flag to identify PM request
      block: add queue runtime pm callbacks
      block: implement block layer runtime pm
      [SCSI] sd: change to auto suspend mode

 block/blk-core.c           |   12 +++++++
 block/blk-settings.c       |    8 +++++
 block/elevator.c           |    9 +++++
 drivers/scsi/scsi_lib.c    |   25 +++++++++++++--
 drivers/scsi/scsi_pm.c     |    7 ++--
 drivers/scsi/sd.c          |   72 ++++++++++++++++++++++++++++++++++++--------
 include/linux/blk_types.h  |    2 +
 include/linux/blkdev.h     |    7 ++++
 include/scsi/scsi_device.h |    4 ++
 9 files changed, 127 insertions(+), 19 deletions(-)