Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S940644AbXHIQNQ (ORCPT ); Thu, 9 Aug 2007 12:13:16 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932126AbXHIQM4 (ORCPT ); Thu, 9 Aug 2007 12:12:56 -0400 Received: from mga03.intel.com ([143.182.124.21]:38016 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758718AbXHIQMx (ORCPT ); Thu, 9 Aug 2007 12:12:53 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.19,241,1183359600"; d="scan'208";a="261012649" Date: Thu, 9 Aug 2007 09:10:01 -0700 From: Kristen Carlson Accardi To: Tejun Heo Cc: Arjan van de Ven , Jeff Garzik , James.Bottomley@steeleye.com, linux-scsi@vger.kernel.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org, edwintorok@gmail.com, axboe@kernel.dk Subject: Re: [patch 2/4] Expose Power Management Policy option to users Message-Id: <20070809091001.149fcc45.kristen.c.accardi@intel.com> In-Reply-To: <20070801141651.a746763b.kristen.c.accardi@intel.com> References: <20070705194909.337398431@intel.com> <20070705130518.135e4e3c.kristen.c.accardi@intel.com> <46AE12B6.6090408@garzik.org> <46AED656.8070407@gmail.com> <1185891382.2750.8.camel@laptopd505.fenrus.org> <46AF4B05.4010700@gmail.com> <1185898532.2766.2.camel@laptopd505.fenrus.org> <46AF7F7E.6060300@gmail.com> <46B05109.4080007@gmail.com> <20070801141651.a746763b.kristen.c.accardi@intel.com> X-Mailer: Sylpheed 2.3.1 (GTK+ 2.10.13; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9449 Lines: 294 On Wed, 1 Aug 2007 14:16:51 -0700 Kristen Carlson Accardi wrote: > I was able to duplicate Tejun's problem on an ATAPI device I had here. > this updated patch fixed my problem. These devices are just setting > PhyReady (N) and CommWake (W) in Serror on power state changes, ignoring > them seems to be fine, and fixed the problem for me. Hi Tejun, Were you able to test out this patch and see if it solved your ATAPI device/ALPM issues? Thanks, Kristen > > > Enable Aggressive Link Power management for AHCI controllers. > > This patch will set the correct bits to turn on Aggressive > Link Power Management (ALPM) for the ahci driver. This > will cause the controller and disk to negotiate a lower > power state for the link when there is no activity (see > the AHCI 1.x spec for details). This feature is mutually > exclusive with Hot Plug, so when ALPM is enabled, Hot Plug > is disabled. ALPM will be enabled by default, but it is > settable via the scsi host syfs interface. Possible > settings for this feature are: > > Setting Effect > ---------------------------------------------------------- > min_power ALPM is enabled, and link set to enter > lowest power state (SLUMBER) when idle > Hot plug not allowed. > > max_performance ALPM is disabled, Hot Plug is allowed > > medium_power ALPM is enabled, and link set to enter > second lowest power state (PARTIAL) when > idle. Hot plug not allowed. > > Signed-off-by: Kristen Carlson Accardi > > Index: 2.6-git/drivers/ata/ahci.c > =================================================================== > --- 2.6-git.orig/drivers/ata/ahci.c > +++ 2.6-git/drivers/ata/ahci.c > @@ -48,6 +48,9 @@ > #define DRV_NAME "ahci" > #define DRV_VERSION "2.3" > > +static int ahci_enable_alpm(struct ata_port *ap, > + enum link_pm policy); > +static int ahci_disable_alpm(struct ata_port *ap); > > enum { > AHCI_PCI_BAR = 5, > @@ -98,6 +101,7 @@ enum { > /* HOST_CAP bits */ > HOST_CAP_SSC = (1 << 14), /* Slumber capable */ > HOST_CAP_CLO = (1 << 24), /* Command List Override support */ > + HOST_CAP_ALPM = (1 << 26), /* Aggressive Link PM support */ > HOST_CAP_SSS = (1 << 27), /* Staggered Spin-up */ > HOST_CAP_SNTF = (1 << 29), /* SNotification register */ > HOST_CAP_NCQ = (1 << 30), /* Native Command Queueing */ > @@ -153,6 +157,8 @@ enum { > PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS, > > /* PORT_CMD bits */ > + PORT_CMD_ASP = (1 << 27), /* Aggressive Slumber/Partial */ > + PORT_CMD_ALPE = (1 << 26), /* Aggressive Link PM enable */ > PORT_CMD_ATAPI = (1 << 24), /* Device is ATAPI */ > PORT_CMD_LIST_ON = (1 << 15), /* cmd list DMA engine running */ > PORT_CMD_FIS_ON = (1 << 14), /* FIS DMA engine running */ > @@ -244,6 +250,11 @@ static int ahci_pci_device_suspend(struc > static int ahci_pci_device_resume(struct pci_dev *pdev); > #endif > > +static struct class_device_attribute *ahci_shost_attrs[] = { > + &class_device_attr_link_power_management_policy, > + NULL > +}; > + > static struct scsi_host_template ahci_sht = { > .module = THIS_MODULE, > .name = DRV_NAME, > @@ -261,6 +272,7 @@ static struct scsi_host_template ahci_sh > .slave_configure = ata_scsi_slave_config, > .slave_destroy = ata_scsi_slave_destroy, > .bios_param = ata_std_bios_param, > + .shost_attrs = ahci_shost_attrs, > }; > > static const struct ata_port_operations ahci_ops = { > @@ -292,6 +304,8 @@ static const struct ata_port_operations > .port_suspend = ahci_port_suspend, > .port_resume = ahci_port_resume, > #endif > + .enable_pm = ahci_enable_alpm, > + .disable_pm = ahci_disable_alpm, > > .port_start = ahci_port_start, > .port_stop = ahci_port_stop, > @@ -778,6 +792,156 @@ static void ahci_power_up(struct ata_por > writel(cmd | PORT_CMD_ICC_ACTIVE, port_mmio + PORT_CMD); > } > > +static int ahci_disable_alpm(struct ata_port *ap) > +{ > + void __iomem *port_mmio = ahci_port_base(ap); > + u32 cmd, scontrol; > + struct ahci_port_priv *pp = ap->private_data; > + > + /* > + * disable Interface Power Management State Transitions > + * This is accomplished by setting bits 8:11 of the > + * SATA Control register > + */ > + scontrol = readl(port_mmio + PORT_SCR_CTL); > + scontrol |= (0x3 << 8); > + writel(scontrol, port_mmio + PORT_SCR_CTL); > + > + /* get the existing command bits */ > + cmd = readl(port_mmio + PORT_CMD); > + > + /* disable ALPM and ASP */ > + cmd &= ~PORT_CMD_ASP; > + cmd &= ~PORT_CMD_ALPE; > + > + /* force the interface back to active */ > + cmd |= PORT_CMD_ICC_ACTIVE; > + > + /* write out new cmd value */ > + writel(cmd, port_mmio + PORT_CMD); > + cmd = readl(port_mmio + PORT_CMD); > + > + /* wait 10ms to be sure we've come out of any low power state */ > + msleep(10); > + > + /* clear out any PhyRdy stuff from interrupt status */ > + writel(PORT_IRQ_PHYRDY, port_mmio + PORT_IRQ_STAT); > + > + /* go ahead and clean out PhyRdy Change from Serror too */ > + ahci_scr_write(ap, SCR_ERROR, ((1 << 16) | (1 << 18))); > + > + /* > + * Clear flag to indicate that we should ignore all PhyRdy > + * state changes > + */ > + ap->flags &= ~AHCI_FLAG_NO_HOTPLUG; > + > + /* > + * Enable interrupts on Phy Ready. > + */ > + pp->intr_mask |= PORT_IRQ_PHYRDY; > + writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK); > + > + /* > + * don't change the link pm policy - we can be called > + * just to turn of link pm temporarily > + */ > + return 0; > +} > + > +static int ahci_enable_alpm(struct ata_port *ap, > + enum link_pm policy) > +{ > + struct ahci_host_priv *hpriv = ap->host->private_data; > + void __iomem *port_mmio = ahci_port_base(ap); > + u32 cmd, scontrol, sstatus; > + struct ahci_port_priv *pp = ap->private_data; > + u32 asp; > + > + /* Make sure the host is capable of link power management */ > + if (!(hpriv->cap & HOST_CAP_ALPM)) { > + ap->pm_policy = NOT_AVAILABLE; > + return -EINVAL; > + } > + > + /* make sure we have a device attached */ > + sstatus = readl(port_mmio + PORT_SCR_STAT); > + if (!(sstatus & 0xf00)) { > + ap->pm_policy = NOT_AVAILABLE; > + return -EINVAL; > + } > + > + switch (policy) { > + case MAX_PERFORMANCE: > + case NOT_AVAILABLE: > + /* > + * if we came here with NOT_AVAILABLE, > + * it just means this is the first time we > + * have tried to enable - default to max performance, > + * and let the user go to lower power modes on request. > + */ > + ahci_disable_alpm(ap); > + ap->pm_policy = MAX_PERFORMANCE; > + return 0; > + case MIN_POWER: > + /* configure HBA to enter SLUMBER */ > + asp = PORT_CMD_ASP; > + break; > + case MEDIUM_POWER: > + /* configure HBA to enter PARTIAL */ > + asp = 0; > + break; > + default: > + return -EINVAL; > + } > + ap->pm_policy = policy; > + > + /* > + * Disable interrupts on Phy Ready. This keeps us from > + * getting woken up due to spurious phy ready interrupts > + * TBD - Hot plug should be done via polling now, is > + * that even supported? > + */ > + pp->intr_mask &= ~PORT_IRQ_PHYRDY; > + writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK); > + > + /* > + * Set a flag to indicate that we should ignore all PhyRdy > + * state changes since these can happen now whenever we > + * change link state > + */ > + ap->flags |= AHCI_FLAG_NO_HOTPLUG; > + > + /* get the existing command bits */ > + cmd = readl(port_mmio + PORT_CMD); > + > + /* > + * enable Interface Power Management State Transitions > + * This is accomplished by clearing bits 8:11 of the > + * SATA Control register > + */ > + scontrol = readl(port_mmio + PORT_SCR_CTL); > + scontrol &= ~(0x3 << 8); > + writel(scontrol, port_mmio + PORT_SCR_CTL); > + > + /* > + * Set ASP based on Policy > + */ > + cmd |= asp; > + > + /* > + * Setting this bit will instruct the HBA to aggressively > + * enter a lower power link state when it's appropriate and > + * based on the value set above for ASP > + */ > + cmd |= PORT_CMD_ALPE; > + > + /* write out new cmd value */ > + writel(cmd, port_mmio + PORT_CMD); > + cmd = readl(port_mmio + PORT_CMD); > + return 0; > +} > + > #ifdef CONFIG_PM > static void ahci_power_down(struct ata_port *ap) > { > @@ -1355,6 +1519,17 @@ static void ahci_port_intr(struct ata_po > status = readl(port_mmio + PORT_IRQ_STAT); > writel(status, port_mmio + PORT_IRQ_STAT); > > + /* If we are getting PhyRdy, this is > + * just a power state change, we should > + * clear out this, plus the PhyRdy/Comm > + * Wake bits from Serror > + */ > + if ((ap->flags & AHCI_FLAG_NO_HOTPLUG) && > + (status & PORT_IRQ_PHYRDY)) { > + status &= ~PORT_IRQ_PHYRDY; > + ahci_scr_write(ap, SCR_ERROR, ((1 << 16) | (1 << 18))); > + } > + > if (unlikely(status & PORT_IRQ_ERROR)) { > ahci_error_intr(ap, status); > return; > @@ -1861,6 +2036,9 @@ static int ahci_init_one(struct pci_dev > struct ata_port *ap = host->ports[i]; > void __iomem *port_mmio = ahci_port_base(ap); > > + /* set initial link pm policy */ > + ap->pm_policy = NOT_AVAILABLE; > + > /* standard SATA port setup */ > if (hpriv->port_map & (1 << i)) > ap->ioaddr.cmd_addr = port_mmio; - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/