From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757373Ab1KJGXD (ORCPT ); Thu, 10 Nov 2011 01:23:03 -0500 Received: from mga03.intel.com ([143.182.124.21]:30670 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753977Ab1KJGXA (ORCPT ); Thu, 10 Nov 2011 01:23:00 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.69,487,1315206000"; d="scan'208";a="72745951" From: Lin Ming To: linux-kernel@vger.kernel.org Cc: linux-ide@vger.kernel.org, linux-scsi@vger.kernel.org, linux-pm@vger.kernel.org, Alan Stern , Jeff Garzik , "Rafael J. Wysocki" , James Bottomley , Tejun Heo , Huang Ying , Zhang Rui Subject: [PATCH v2 0/4] ata port runtime power management support Date: Thu, 10 Nov 2011 14:22:42 +0800 Message-Id: <1320906166-15459-1-git-send-email-ming.m.lin@intel.com> X-Mailer: git-send-email 1.7.2.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, all These 4 patches add ata port runtime pm support. v1: https://lkml.org/lkml/2011/11/2/23 v2 is totally different than v1. v1 performed ata port runtime pm through scsi layer. Added hook to scsi host runtime suspend/resume code. I realized that this is not the natural way to do ata port runtime pm. It does not deal with the races with ata port system suspend/resume. With v2, ata port is made to be parent device of scsi host. Currently, the device tree of ata port and scsi host looks as below, /sys/devices/pci0000:00/0000:00:1f.2 (ahci controller) |-- ata1 (ata port) |-- host0 (scsi host) |-- target0:0:0 (scsi target) |-- 0:0:0:0 (disk) v2 changes it to: /sys/devices/pci0000:00/0000:00:1f.2 (ahci controller) |-- ata1 (ata port) |-- host0 (scsi host) |-- target0:0:0 (scsi target) |-- 0:0:0:0 (disk) So ata port runtime PM will happen as: disk suspend --> scsi target suspend --> scsi host suspend --> ata port suspend. This is much cleaner and natural. Lin Ming (4): ata: make ata port as parent device of scsi host scsi: add flag to skip the runtime PM calls on host in EH ata: add ata port system PM callbacks ata: add ata port runtime PM callbacks drivers/ata/libata-core.c | 158 ++++++++++++++++++++++------------------ drivers/ata/libata-scsi.c | 3 +- drivers/ata/libata-transport.c | 5 + drivers/ata/libata.h | 1 + drivers/scsi/scsi_error.c | 5 +- include/scsi/scsi_host.h | 3 + 6 files changed, 102 insertions(+), 73 deletions(-) Thanks for any comment. Lin Min