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SubjectRe: [PATCH] SATA / AHCI: Do not play with the link PM during suspend to RAM
Hello, Rafael.

Can you please try the following patch and see whether the problem
goes away?

Thanks.

drivers/ata/ahci.c | 3
drivers/ata/ahci.h | 1
drivers/ata/ahci_platform.c | 3
drivers/ata/ata_piix.c | 24 +++
drivers/ata/libahci.c | 161 +++++++-------------------
drivers/ata/libata-core.c | 269 ++++++++++----------------------------------
drivers/ata/libata-eh.c | 176 +++++++++++++++++++++++++---
drivers/ata/libata-pmp.c | 49 +++++++-
drivers/ata/libata-scsi.c | 74 ++++--------
drivers/ata/libata.h | 12 +
include/linux/libata.h | 40 +++---
11 files changed, 393 insertions(+), 419 deletions(-)
diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
index f252253..cfdc22b 100644
--- a/drivers/ata/ahci.c
+++ b/drivers/ata/ahci.c
@@ -1190,9 +1190,6 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
ata_port_pbar_desc(ap, AHCI_PCI_BAR,
0x100 + ap->port_no * 0x80, "port");

- /* set initial link pm policy */
- ap->pm_policy = NOT_AVAILABLE;
-
/* set enclosure management message type */
if (ap->flags & ATA_FLAG_EM)
ap->em_message_type = hpriv->em_msg_type;
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index 7113c57..6d07948 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -201,7 +201,6 @@ enum {
AHCI_HFLAG_MV_PATA = (1 << 4), /* PATA port */
AHCI_HFLAG_NO_MSI = (1 << 5), /* no PCI MSI */
AHCI_HFLAG_NO_PMP = (1 << 6), /* no PMP */
- AHCI_HFLAG_NO_HOTPLUG = (1 << 7), /* ignore PxSERR.DIAG.N */
AHCI_HFLAG_SECT255 = (1 << 8), /* max 255 sectors */
AHCI_HFLAG_YES_NCQ = (1 << 9), /* force NCQ cap on */
AHCI_HFLAG_NO_SUSPEND = (1 << 10), /* don't suspend */
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index 5e11b16..0f69afe 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -120,9 +120,6 @@ static int __init ahci_probe(struct platform_device *pdev)
ata_port_desc(ap, "mmio %pR", mem);
ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);

- /* set initial link pm policy */
- ap->pm_policy = NOT_AVAILABLE;
-
/* set enclosure management message type */
if (ap->flags & ATA_FLAG_EM)
ap->em_message_type = hpriv->em_msg_type;
diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
index 7409f98..0df0477 100644
--- a/drivers/ata/ata_piix.c
+++ b/drivers/ata/ata_piix.c
@@ -174,6 +174,8 @@ static int piix_sidpr_scr_read(struct ata_link *link,
unsigned int reg, u32 *val);
static int piix_sidpr_scr_write(struct ata_link *link,
unsigned int reg, u32 val);
+static int piix_sidpr_set_ipm(struct ata_link *link, enum ata_ipm_policy policy,
+ unsigned hints);
static bool piix_irq_check(struct ata_port *ap);
#ifdef CONFIG_PM
static int piix_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
@@ -343,11 +345,22 @@ static struct ata_port_operations ich_pata_ops = {
.set_dmamode = ich_set_dmamode,
};

+static struct device_attribute *piix_sidpr_shost_attrs[] = {
+ &dev_attr_link_power_management_policy,
+ NULL
+};
+
+static struct scsi_host_template piix_sidpr_sht = {
+ ATA_BMDMA_SHT(DRV_NAME),
+ .shost_attrs = piix_sidpr_shost_attrs,
+};
+
static struct ata_port_operations piix_sidpr_sata_ops = {
.inherits = &piix_sata_ops,
.hardreset = sata_std_hardreset,
.scr_read = piix_sidpr_scr_read,
.scr_write = piix_sidpr_scr_write,
+ .set_ipm = piix_sidpr_set_ipm,
};

static const struct piix_map_db ich5_map_db = {
@@ -973,6 +986,12 @@ static int piix_sidpr_scr_write(struct ata_link *link,
return 0;
}

+static int piix_sidpr_set_ipm(struct ata_link *link, enum ata_ipm_policy policy,
+ unsigned hints)
+{
+ return sata_link_scr_ipm(link, policy, false);
+}
+
static bool piix_irq_check(struct ata_port *ap)
{
if (unlikely(!ap->ioaddr.bmdma_addr))
@@ -1532,6 +1551,7 @@ static int __devinit piix_init_one(struct pci_dev *pdev,
struct device *dev = &pdev->dev;
struct ata_port_info port_info[2];
const struct ata_port_info *ppi[] = { &port_info[0], &port_info[1] };
+ struct scsi_host_template *sht = &piix_sht;
unsigned long port_flags;
struct ata_host *host;
struct piix_host_priv *hpriv;
@@ -1600,6 +1620,8 @@ static int __devinit piix_init_one(struct pci_dev *pdev,
rc = piix_init_sidpr(host);
if (rc)
return rc;
+ if (host->ports[0]->ops == &piix_sidpr_sata_ops)
+ sht = &piix_sidpr_sht;
}

/* apply IOCFG bit18 quirk */
@@ -1626,7 +1648,7 @@ static int __devinit piix_init_one(struct pci_dev *pdev,
host->flags |= ATA_HOST_PARALLEL_SCAN;

pci_set_master(pdev);
- return ata_pci_sff_activate_host(host, ata_bmdma_interrupt, &piix_sht);
+ return ata_pci_sff_activate_host(host, ata_bmdma_interrupt, sht);
}

static void piix_remove_one(struct pci_dev *pdev)
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 81e772a..2c5f3df 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -56,9 +56,8 @@ MODULE_PARM_DESC(skip_host_reset, "skip global host reset (0=don't skip, 1=skip)
module_param_named(ignore_sss, ahci_ignore_sss, int, 0444);
MODULE_PARM_DESC(ignore_sss, "Ignore staggered spinup flag (0=don't ignore, 1=ignore)");

-static int ahci_enable_alpm(struct ata_port *ap,
- enum link_pm policy);
-static void ahci_disable_alpm(struct ata_port *ap);
+static int ahci_set_ipm(struct ata_link *link, enum ata_ipm_policy policy,
+ unsigned hints);
static ssize_t ahci_led_show(struct ata_port *ap, char *buf);
static ssize_t ahci_led_store(struct ata_port *ap, const char *buf,
size_t size);
@@ -172,8 +171,7 @@ struct ata_port_operations ahci_ops = {
.pmp_attach = ahci_pmp_attach,
.pmp_detach = ahci_pmp_detach,

- .enable_pm = ahci_enable_alpm,
- .disable_pm = ahci_disable_alpm,
+ .set_ipm = ahci_set_ipm,
.em_show = ahci_led_show,
.em_store = ahci_led_store,
.sw_activity_show = ahci_activity_show,
@@ -644,127 +642,59 @@ static void ahci_power_up(struct ata_port *ap)
writel(cmd | PORT_CMD_ICC_ACTIVE, port_mmio + PORT_CMD);
}

-static void ahci_disable_alpm(struct ata_port *ap)
+static int ahci_set_ipm(struct ata_link *link, enum ata_ipm_policy policy,
+ unsigned int hints)
{
+ struct ata_port *ap = link->ap;
struct ahci_host_priv *hpriv = ap->host->private_data;
- void __iomem *port_mmio = ahci_port_base(ap);
- u32 cmd;
struct ahci_port_priv *pp = ap->private_data;
-
- /* IPM bits should be disabled by libata-core */
- /* 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->link, SCR_ERROR, ((1 << 16) | (1 << 18)));
-
- /*
- * Clear flag to indicate that we should ignore all PhyRdy
- * state changes
- */
- hpriv->flags &= ~AHCI_HFLAG_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
- */
-}
-
-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;
- 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))
- return -EINVAL;
+ ata_link_printk(link, KERN_INFO, "XXX ahci_set_ipm: pol=%d hints=%x\n",
+ policy, hints);

- switch (policy) {
- case MAX_PERFORMANCE:
- case NOT_AVAILABLE:
+ if (policy != ATA_IPM_MAX_POWER) {
/*
- * 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.
+ * Disable interrupts on Phy Ready. This keeps us from
+ * getting woken up due to spurious phy ready
+ * interrupts.
*/
- ahci_disable_alpm(ap);
- 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;
+ pp->intr_mask &= ~PORT_IRQ_PHYRDY;
+ writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
+
+ sata_link_scr_ipm(link, policy, false);
}

- /*
- * 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);
+ if (hpriv->cap & HOST_CAP_ALPM) {
+ u32 cmd = readl(port_mmio + PORT_CMD);

- /*
- * Set a flag to indicate that we should ignore all PhyRdy
- * state changes since these can happen now whenever we
- * change link state
- */
- hpriv->flags |= AHCI_HFLAG_NO_HOTPLUG;
+ if (policy == ATA_IPM_MAX_POWER || !(hints & ATA_IPM_HIPM)) {
+ cmd &= ~(PORT_CMD_ASP | PORT_CMD_ALPE);
+ cmd |= PORT_CMD_ICC_ACTIVE;

- /* get the existing command bits */
- cmd = readl(port_mmio + PORT_CMD);
+ writel(cmd, port_mmio + PORT_CMD);
+ readl(port_mmio + PORT_CMD);

- /*
- * Set ASP based on Policy
- */
- cmd |= asp;
+ /* wait 10ms to be sure we've come out of IPM state */
+ msleep(10);
+ } else {
+ cmd |= PORT_CMD_ALPE;
+ if (policy == ATA_IPM_MIN_POWER)
+ cmd |= PORT_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);
+ }
+ }

- /* write out new cmd value */
- writel(cmd, port_mmio + PORT_CMD);
- cmd = readl(port_mmio + PORT_CMD);
+ if (policy == ATA_IPM_MAX_POWER) {
+ sata_link_scr_ipm(link, policy, false);
+
+ /* turn PHYRDY IRQ back on */
+ pp->intr_mask |= PORT_IRQ_PHYRDY;
+ writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
+ }

- /* IPM bits should be set by libata-core */
return 0;
}

@@ -1662,15 +1592,10 @@ static void ahci_port_intr(struct ata_port *ap)
if (unlikely(resetting))
status &= ~PORT_IRQ_BAD_PMP;

- /* 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 ((hpriv->flags & AHCI_HFLAG_NO_HOTPLUG) &&
- (status & PORT_IRQ_PHYRDY)) {
+ /* if IPM is enabled, PHYRDY doesn't mean anything */
+ if (ap->link.ipm_policy > ATA_IPM_MAX_POWER) {
status &= ~PORT_IRQ_PHYRDY;
- ahci_scr_write(&ap->link, SCR_ERROR, ((1 << 16) | (1 << 18)));
+ ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG);
}

if (unlikely(status & PORT_IRQ_ERROR)) {
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index ddf8e48..5d1eeb1 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -91,8 +91,6 @@ const struct ata_port_operations sata_port_ops = {
static unsigned int ata_dev_init_params(struct ata_device *dev,
u16 heads, u16 sectors);
static unsigned int ata_dev_set_xfermode(struct ata_device *dev);
-static unsigned int ata_dev_set_feature(struct ata_device *dev,
- u8 enable, u8 feature);
static void ata_dev_xfermask(struct ata_device *dev);
static unsigned long ata_dev_blacklisted(const struct ata_device *dev);

@@ -1032,182 +1030,6 @@ static const char *sata_spd_string(unsigned int spd)
return spd_str[spd - 1];
}

-static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
-{
- struct ata_link *link = dev->link;
- struct ata_port *ap = link->ap;
- u32 scontrol;
- unsigned int err_mask;
- int rc;
-
- /*
- * disallow DIPM for drivers which haven't set
- * ATA_FLAG_IPM. This is because when DIPM is enabled,
- * phy ready will be set in the interrupt status on
- * state changes, which will cause some drivers to
- * think there are errors - additionally drivers will
- * need to disable hot plug.
- */
- if (!(ap->flags & ATA_FLAG_IPM) || !ata_dev_enabled(dev)) {
- ap->pm_policy = NOT_AVAILABLE;
- return -EINVAL;
- }
-
- /*
- * For DIPM, we will only enable it for the
- * min_power setting.
- *
- * Why? Because Disks are too stupid to know that
- * If the host rejects a request to go to SLUMBER
- * they should retry at PARTIAL, and instead it
- * just would give up. So, for medium_power to
- * work at all, we need to only allow HIPM.
- */
- rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
- if (rc)
- return rc;
-
- switch (policy) {
- case MIN_POWER:
- /* no restrictions on IPM transitions */
- scontrol &= ~(0x3 << 8);
- rc = sata_scr_write(link, SCR_CONTROL, scontrol);
- if (rc)
- return rc;
-
- /* enable DIPM */
- if (dev->flags & ATA_DFLAG_DIPM)
- err_mask = ata_dev_set_feature(dev,
- SETFEATURES_SATA_ENABLE, SATA_DIPM);
- break;
- case MEDIUM_POWER:
- /* allow IPM to PARTIAL */
- scontrol &= ~(0x1 << 8);
- scontrol |= (0x2 << 8);
- rc = sata_scr_write(link, SCR_CONTROL, scontrol);
- if (rc)
- return rc;
-
- /*
- * we don't have to disable DIPM since IPM flags
- * disallow transitions to SLUMBER, which effectively
- * disable DIPM if it does not support PARTIAL
- */
- break;
- case NOT_AVAILABLE:
- case MAX_PERFORMANCE:
- /* disable all IPM transitions */
- scontrol |= (0x3 << 8);
- rc = sata_scr_write(link, SCR_CONTROL, scontrol);
- if (rc)
- return rc;
-
- /*
- * we don't have to disable DIPM since IPM flags
- * disallow all transitions which effectively
- * disable DIPM anyway.
- */
- break;
- }
-
- /* FIXME: handle SET FEATURES failure */
- (void) err_mask;
-
- return 0;
-}
-
-/**
- * ata_dev_enable_pm - enable SATA interface power management
- * @dev: device to enable power management
- * @policy: the link power management policy
- *
- * Enable SATA Interface power management. This will enable
- * Device Interface Power Management (DIPM) for min_power
- * policy, and then call driver specific callbacks for
- * enabling Host Initiated Power management.
- *
- * Locking: Caller.
- * Returns: -EINVAL if IPM is not supported, 0 otherwise.
- */
-void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
-{
- int rc = 0;
- struct ata_port *ap = dev->link->ap;
-
- /* set HIPM first, then DIPM */
- if (ap->ops->enable_pm)
- rc = ap->ops->enable_pm(ap, policy);
- if (rc)
- goto enable_pm_out;
- rc = ata_dev_set_dipm(dev, policy);
-
-enable_pm_out:
- if (rc)
- ap->pm_policy = MAX_PERFORMANCE;
- else
- ap->pm_policy = policy;
- return /* rc */; /* hopefully we can use 'rc' eventually */
-}
-
-#ifdef CONFIG_PM
-/**
- * ata_dev_disable_pm - disable SATA interface power management
- * @dev: device to disable power management
- *
- * Disable SATA Interface power management. This will disable
- * Device Interface Power Management (DIPM) without changing
- * policy, call driver specific callbacks for disabling Host
- * Initiated Power management.
- *
- * Locking: Caller.
- * Returns: void
- */
-static void ata_dev_disable_pm(struct ata_device *dev)
-{
- struct ata_port *ap = dev->link->ap;
-
- ata_dev_set_dipm(dev, MAX_PERFORMANCE);
- if (ap->ops->disable_pm)
- ap->ops->disable_pm(ap);
-}
-#endif /* CONFIG_PM */
-
-void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
-{
- ap->pm_policy = policy;
- ap->link.eh_info.action |= ATA_EH_LPM;
- ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
- ata_port_schedule_eh(ap);
-}
-
-#ifdef CONFIG_PM
-static void ata_lpm_enable(struct ata_host *host)
-{
- struct ata_link *link;
- struct ata_port *ap;
- struct ata_device *dev;
- int i;
-
- for (i = 0; i < host->n_ports; i++) {
- ap = host->ports[i];
- ata_for_each_link(link, ap, EDGE) {
- ata_for_each_dev(dev, link, ALL)
- ata_dev_disable_pm(dev);
- }
- }
-}
-
-static void ata_lpm_disable(struct ata_host *host)
-{
- int i;
-
- for (i = 0; i < host->n_ports; i++) {
- struct ata_port *ap = host->ports[i];
- ata_lpm_schedule(ap, ap->pm_policy);
- }
-}
-#endif /* CONFIG_PM */
-
/**
* ata_dev_classify - determine device type based on ATA-spec signature
* @tf: ATA taskfile register set for device to be identified
@@ -2566,13 +2388,6 @@ int ata_dev_configure(struct ata_device *dev)
if (dev->flags & ATA_DFLAG_LBA48)
dev->max_sectors = ATA_MAX_SECTORS_LBA48;

- if (!(dev->horkage & ATA_HORKAGE_IPM)) {
- if (ata_id_has_hipm(dev->id))
- dev->flags |= ATA_DFLAG_HIPM;
- if (ata_id_has_dipm(dev->id))
- dev->flags |= ATA_DFLAG_DIPM;
- }
-
/* Limit PATA drive on SATA cable bridge transfers to udma5,
200 sectors */
if (ata_dev_knobble(dev)) {
@@ -2593,13 +2408,6 @@ int ata_dev_configure(struct ata_device *dev)
dev->max_sectors = min_t(unsigned int, ATA_MAX_SECTORS_128,
dev->max_sectors);

- if (ata_dev_blacklisted(dev) & ATA_HORKAGE_IPM) {
- dev->horkage |= ATA_HORKAGE_IPM;
-
- /* reset link pm_policy for this port to no pm */
- ap->pm_policy = MAX_PERFORMANCE;
- }
-
if (ap->ops->dev_config)
ap->ops->dev_config(dev);

@@ -3630,7 +3438,7 @@ int ata_wait_after_reset(struct ata_link *link, unsigned long deadline,
* @params: timing parameters { interval, duratinon, timeout } in msec
* @deadline: deadline jiffies for the operation
*
-* Make sure SStatus of @link reaches stable state, determined by
+ * Make sure SStatus of @link reaches stable state, determined by
* holding the same value where DET is not 1 for @duration polled
* every @interval, before @timeout. Timeout constraints the
* beginning of the stable state. Because DET gets stuck at 1 on
@@ -3761,6 +3569,65 @@ int sata_link_resume(struct ata_link *link, const unsigned long *params,
return rc != -EINVAL ? rc : 0;
}

+int sata_link_scr_ipm(struct ata_link *link, enum ata_ipm_policy policy,
+ bool spm_wakeup)
+{
+ struct ata_eh_context *ehc = &link->eh_context;
+ bool woken_up = false;
+ u32 scontrol;
+ int rc;
+
+ ata_link_printk(link, KERN_INFO,
+ "XXX sata_link_scr_ipm: pol=%d spm_wakeup=%d\n",
+ policy, spm_wakeup);
+ rc = sata_scr_read(link, SCR_CONTROL, &scontrol);
+ if (rc)
+ return rc;
+
+ switch (policy) {
+ case ATA_IPM_MAX_POWER:
+ /* disable all IPM transitions */
+ scontrol |= (0x3 << 8);
+ /* initiate transition to active state */
+ if (spm_wakeup) {
+ scontrol |= (0x4 << 12);
+ woken_up = true;
+ }
+ break;
+ case ATA_IPM_MED_POWER:
+ /* allow IPM to PARTIAL */
+ scontrol &= ~(0x1 << 8);
+ scontrol |= (0x2 << 8);
+ break;
+ case ATA_IPM_MIN_POWER:
+ /* no restrictions on IPM transitions */
+ scontrol &= ~(0x3 << 8);
+ break;
+ default:
+ WARN_ON(1);
+ }
+
+ ata_link_printk(link, KERN_INFO,
+ "XXX sata_link_scr_ipm: updating sctl to %x\n",
+ scontrol);
+ rc = sata_scr_write(link, SCR_CONTROL, scontrol);
+ if (rc)
+ return rc;
+
+ /* give the link time to transit out of IPM state */
+ if (woken_up) {
+ msleep(10);
+ ata_link_printk(link, KERN_INFO,
+ "XXX sata_link_scr_ipm: sleeping 10msec\n");
+ }
+
+ /* clear PHYRDY_CHG from SError */
+ ata_link_printk(link, KERN_INFO,
+ "XXX sata_link_scr_ipm: clearing serr\n");
+ ehc->i.serror &= ~SERR_PHYRDY_CHG;
+ return sata_scr_write(link, SCR_ERROR, SERR_PHYRDY_CHG);
+}
+
/**
* ata_std_prereset - prepare for reset
* @link: ATA link to be reset
@@ -4570,6 +4437,7 @@ static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
DPRINTK("EXIT, err_mask=%x\n", err_mask);
return err_mask;
}
+
/**
* ata_dev_set_feature - Issue SET FEATURES - SATA FEATURES
* @dev: Device to which command will be sent
@@ -4585,8 +4453,7 @@ static unsigned int ata_dev_set_xfermode(struct ata_device *dev)
* RETURNS:
* 0 on success, AC_ERR_* mask otherwise.
*/
-static unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable,
- u8 feature)
+unsigned int ata_dev_set_feature(struct ata_device *dev, u8 enable, u8 feature)
{
struct ata_taskfile tf;
unsigned int err_mask;
@@ -5436,12 +5303,6 @@ int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
{
int rc;

- /*
- * disable link pm on all ports before requesting
- * any pm activity
- */
- ata_lpm_enable(host);
-
rc = ata_host_request_pm(host, mesg, 0, ATA_EHI_QUIET, 1);
if (rc == 0)
host->dev->power.power_state = mesg;
@@ -5464,9 +5325,6 @@ void ata_host_resume(struct ata_host *host)
ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
host->dev->power.power_state = PMSG_ON;
-
- /* reenable link pm */
- ata_lpm_disable(host);
}
#endif

@@ -6025,7 +5883,7 @@ static void async_port_probe(void *data, async_cookie_t cookie)
spin_lock_irqsave(ap->lock, flags);

ehi->probe_mask |= ATA_ALL_DEVICES;
- ehi->action |= ATA_EH_RESET | ATA_EH_LPM;
+ ehi->action |= ATA_EH_RESET;
ehi->flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET;

ap->pflags &= ~ATA_PFLAG_INITIALIZING;
@@ -6698,6 +6556,7 @@ EXPORT_SYMBOL_GPL(sata_set_spd);
EXPORT_SYMBOL_GPL(ata_wait_after_reset);
EXPORT_SYMBOL_GPL(sata_link_debounce);
EXPORT_SYMBOL_GPL(sata_link_resume);
+EXPORT_SYMBOL_GPL(sata_link_scr_ipm);
EXPORT_SYMBOL_GPL(ata_std_prereset);
EXPORT_SYMBOL_GPL(sata_link_hardreset);
EXPORT_SYMBOL_GPL(sata_std_hardreset);
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index f77a673..bd77d94 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -1568,14 +1568,15 @@ static void ata_eh_analyze_serror(struct ata_link *link)
action |= ATA_EH_RESET;
}

- /* Determine whether a hotplug event has occurred. Both
+ /*
+ * Determine whether a hotplug event has occurred. Both
* SError.N/X are considered hotplug events for enabled or
* host links. For disabled PMP links, only N bit is
* considered as X bit is left at 1 for link plugging.
*/
- hotplug_mask = 0;
-
- if (!(link->flags & ATA_LFLAG_DISABLED) || ata_is_host_link(link))
+ if (link->ipm_policy != ATA_IPM_MAX_POWER)
+ hotplug_mask = 0; /* hotplug doesn't work w/ IPM */
+ else if (!(link->flags & ATA_LFLAG_DISABLED) || ata_is_host_link(link))
hotplug_mask = SERR_PHYRDY_CHG | SERR_DEV_XCHG;
else
hotplug_mask = SERR_PHYRDY_CHG;
@@ -2776,8 +2777,9 @@ int ata_eh_reset(struct ata_link *link, int classify,
ata_eh_done(link, NULL, ATA_EH_RESET);
if (slave)
ata_eh_done(slave, NULL, ATA_EH_RESET);
- ehc->last_reset = jiffies; /* update to completion time */
+ ehc->last_reset = jiffies; /* update to completion time */
ehc->i.action |= ATA_EH_REVALIDATE;
+ link->ipm_policy = ATA_IPM_UNKNOWN; /* reset IPM state */

rc = 0;
out:
@@ -3203,6 +3205,124 @@ static int ata_eh_maybe_retry_flush(struct ata_device *dev)
return rc;
}

+/**
+ * ata_eh_set_ipm - configure SATA interface power management
+ * @link: link to configure power management
+ * @policy: the link power management policy
+ * @r_failed_dev: out parameter for failed device
+ *
+ * Enable SATA Interface power management. This will enable
+ * Device Interface Power Management (DIPM) for min_power
+ * policy, and then call driver specific callbacks for
+ * enabling Host Initiated Power management.
+ *
+ * LOCKING:
+ * EH context.
+ *
+ * RETURNS:
+ * 0 on success, -errno on failure.
+ */
+static int ata_eh_set_ipm(struct ata_link *link, enum ata_ipm_policy policy,
+ struct ata_device **r_failed_dev)
+{
+ struct ata_port *ap = ata_is_host_link(link) ? link->ap : NULL;
+ struct ata_eh_context *ehc = &link->eh_context;
+ struct ata_device *dev, *link_dev = NULL, *ipm_dev = NULL;
+ unsigned int hints = ATA_IPM_EMPTY | ATA_IPM_HIPM;
+ unsigned int err_mask;
+ int rc;
+
+ /* if the link or host doesn't do IPM, noop */
+ if ((link->flags & ATA_LFLAG_NO_IPM) || (ap && !ap->ops->set_ipm))
+ return 0;
+
+ /*
+ * DIPM is enabled only for MIN_POWER as some devices
+ * misbehave when the host NACKs transition to SLUMBER. Order
+ * device and link configurations such that the host always
+ * allows DIPM requests.
+ */
+ ata_for_each_dev(dev, link, ENABLED) {
+ bool hipm = ata_id_has_hipm(dev->id);
+ bool dipm = ata_id_has_dipm(dev->id);
+
+ /* find the first enabled and IPM enabled devices */
+ if (!link_dev)
+ link_dev = dev;
+
+ if (!ipm_dev && (hipm || dipm))
+ ipm_dev = dev;
+
+ hints &= ~ATA_IPM_EMPTY;
+ if (!hipm)
+ hints &= ~ATA_IPM_HIPM;
+
+ /* disable DIPM before changing link config */
+ if (policy != ATA_IPM_MIN_POWER && dipm) {
+ ata_dev_printk(dev, KERN_INFO, "XXX ata_eh_set_ipm: disabling DIPM\n");
+ err_mask = ata_dev_set_feature(dev,
+ SETFEATURES_SATA_DISABLE, SATA_DIPM);
+ if (err_mask && err_mask != AC_ERR_DEV) {
+ ata_dev_printk(dev, KERN_WARNING,
+ "error while disabling DIPM\n");
+ rc = -EIO;
+ goto fail;
+ }
+ }
+ }
+
+ if (ap) {
+ rc = ap->ops->set_ipm(link, policy, hints);
+ if (!rc && ap->slave_link)
+ rc = ap->ops->set_ipm(ap->slave_link, policy, hints);
+ } else
+ rc = sata_pmp_set_ipm(link, policy, hints);
+
+ /*
+ * Attribute link config failure to the first (IPM) enabled
+ * device on the link.
+ */
+ if (rc) {
+ if (rc == -EOPNOTSUPP) {
+ link->flags |= ATA_LFLAG_NO_IPM;
+ return 0;
+ }
+ dev = ipm_dev ? ipm_dev : link_dev;
+ goto fail;
+ }
+
+ /* host config updated, enable DIPM if transitioning to MIN_POWER */
+ ata_for_each_dev(dev, link, ENABLED) {
+ if (policy == ATA_IPM_MIN_POWER && ata_id_has_dipm(dev->id)) {
+ ata_dev_printk(dev, KERN_INFO, "XXX ata_eh_set_ipm: enabling DIPM\n");
+ err_mask = ata_dev_set_feature(dev,
+ SETFEATURES_SATA_ENABLE, SATA_DIPM);
+ if (err_mask && err_mask != AC_ERR_DEV) {
+ ata_dev_printk(dev, KERN_WARNING,
+ "error while enabling DIPM\n");
+ rc = -EIO;
+ goto fail;
+ }
+ }
+ }
+
+ link->ipm_policy = policy;
+ if (ap && ap->slave_link)
+ ap->slave_link->ipm_policy = policy;
+ return 0;
+
+fail:
+ /* if no device or the last chance for the device, disable IPM */
+ if (!dev || ehc->tries[dev->devno] == 1) {
+ ata_link_printk(link, KERN_WARNING,
+ "disabling IPM on the link\n");
+ link->flags |= ATA_LFLAG_NO_IPM;
+ }
+ if (r_failed_dev)
+ *r_failed_dev = dev;
+ return rc;
+}
+
static int ata_link_nr_enabled(struct ata_link *link)
{
struct ata_device *dev;
@@ -3283,6 +3403,16 @@ static int ata_eh_schedule_probe(struct ata_device *dev)
ehc->saved_xfer_mode[dev->devno] = 0;
ehc->saved_ncq_enabled &= ~(1 << dev->devno);

+ /* the link maybe in a deep sleep, wake it up */
+ if (link->ipm_policy > ATA_IPM_MAX_POWER) {
+ if (ata_is_host_link(link))
+ link->ap->ops->set_ipm(link, ATA_IPM_MAX_POWER,
+ ATA_IPM_EMPTY);
+ else
+ sata_pmp_set_ipm(link, ATA_IPM_MAX_POWER,
+ ATA_IPM_EMPTY);
+ }
+
/* Record and count probe trials on the ering. The specific
* error mask used is irrelevant. Because a successful device
* detection clears the ering, this count accumulates only if
@@ -3384,8 +3514,7 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
{
struct ata_link *link;
struct ata_device *dev;
- int nr_failed_devs;
- int rc;
+ int rc, nr_fails;
unsigned long flags, deadline;

DPRINTK("ENTER\n");
@@ -3426,7 +3555,6 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,

retry:
rc = 0;
- nr_failed_devs = 0;

/* if UNLOADING, finish immediately */
if (ap->pflags & ATA_PFLAG_UNLOADING)
@@ -3511,13 +3639,17 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
}

/* the rest */
- ata_for_each_link(link, ap, EDGE) {
+ nr_fails = 0;
+ ata_for_each_link(link, ap, PMP_FIRST) {
struct ata_eh_context *ehc = &link->eh_context;

+ if (sata_pmp_attached(ap) && ata_is_host_link(link))
+ goto config_ipm;
+
/* revalidate existing devices and attach new ones */
rc = ata_eh_revalidate_and_attach(link, &dev);
if (rc)
- goto dev_fail;
+ goto rest_fail;

/* if PMP got attached, return, pmp EH will take care of it */
if (link->device->class == ATA_DEV_PMP) {
@@ -3529,7 +3661,7 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
if (ehc->i.flags & ATA_EHI_SETMODE) {
rc = ata_set_mode(link, &dev);
if (rc)
- goto dev_fail;
+ goto rest_fail;
ehc->i.flags &= ~ATA_EHI_SETMODE;
}

@@ -3542,7 +3674,7 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
continue;
rc = atapi_eh_clear_ua(dev);
if (rc)
- goto dev_fail;
+ goto rest_fail;
}
}

@@ -3552,21 +3684,25 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
continue;
rc = ata_eh_maybe_retry_flush(dev);
if (rc)
- goto dev_fail;
+ goto rest_fail;
}

+ config_ipm:
/* configure link power saving */
- if (ehc->i.action & ATA_EH_LPM)
- ata_for_each_dev(dev, link, ALL)
- ata_dev_enable_pm(dev, ap->pm_policy);
+ if (link->ipm_policy != ap->target_ipm_policy) {
+ rc = ata_eh_set_ipm(link, ap->target_ipm_policy, &dev);
+ if (rc)
+ goto rest_fail;
+ }

/* this link is okay now */
ehc->i.flags = 0;
continue;

-dev_fail:
- nr_failed_devs++;
- ata_eh_handle_dev_fail(dev, rc);
+ rest_fail:
+ nr_fails++;
+ if (dev)
+ ata_eh_handle_dev_fail(dev, rc);

if (ap->pflags & ATA_PFLAG_FROZEN) {
/* PMP reset requires working host port.
@@ -3578,7 +3714,7 @@ dev_fail:
}
}

- if (nr_failed_devs)
+ if (nr_fails)
goto retry;

out:
diff --git a/drivers/ata/libata-pmp.c b/drivers/ata/libata-pmp.c
index 224faab..06a66ca 100644
--- a/drivers/ata/libata-pmp.c
+++ b/drivers/ata/libata-pmp.c
@@ -185,6 +185,27 @@ int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
}

/**
+ * sata_pmp_set_ipm - configure IPM for a PMP link
+ * @link: PMP link to configure IPM for
+ * @policy: target IPM policy
+ * @hints: IPM hints
+ *
+ * Configure IPM for @link. This function will contain any PMP
+ * specific workarounds if necessary.
+ *
+ * LOCKING:
+ * EH context.
+ *
+ * RETURNS:
+ * 0 on success, -errno on failure.
+ */
+int sata_pmp_set_ipm(struct ata_link *link, enum ata_ipm_policy policy,
+ unsigned hints)
+{
+ return sata_link_scr_ipm(link, policy, true);
+}
+
+/**
* sata_pmp_read_gscr - read GSCR block of SATA PMP
* @dev: PMP device
* @gscr: buffer to read GSCR block into
@@ -351,6 +372,9 @@ static void sata_pmp_quirks(struct ata_port *ap)
if (vendor == 0x1095 && devid == 0x3726) {
/* sil3726 quirks */
ata_for_each_link(link, ap, EDGE) {
+ /* link reports offline after IPM */
+ link->flags |= ATA_LFLAG_NO_IPM;
+
/* Class code report is unreliable and SRST
* times out under certain configurations.
*/
@@ -366,6 +390,9 @@ static void sata_pmp_quirks(struct ata_port *ap)
} else if (vendor == 0x1095 && devid == 0x4723) {
/* sil4723 quirks */
ata_for_each_link(link, ap, EDGE) {
+ /* link reports offline after IPM */
+ link->flags |= ATA_LFLAG_NO_IPM;
+
/* class code report is unreliable */
if (link->pmp < 2)
link->flags |= ATA_LFLAG_ASSUME_ATA;
@@ -378,6 +405,9 @@ static void sata_pmp_quirks(struct ata_port *ap)
} else if (vendor == 0x1095 && devid == 0x4726) {
/* sil4726 quirks */
ata_for_each_link(link, ap, EDGE) {
+ /* link reports offline after IPM */
+ link->flags |= ATA_LFLAG_NO_IPM;
+
/* Class code report is unreliable and SRST
* times out under certain configurations.
* Config device can be at port 0 or 5 and
@@ -938,15 +968,26 @@ static int sata_pmp_eh_recover(struct ata_port *ap)
if (rc)
goto link_fail;

- /* Connection status might have changed while resetting other
- * links, check SATA_PMP_GSCR_ERROR before returning.
- */
-
+
/* clear SNotification */
rc = sata_scr_read(&ap->link, SCR_NOTIFICATION, &sntf);
if (rc == 0)
sata_scr_write(&ap->link, SCR_NOTIFICATION, sntf);

+ /*
+ * If IPM is active on any fan-out port, hotplug wouldn't
+ * work. Return w/ PHY event notification disabled.
+ */
+ ata_for_each_link(link, ap, EDGE)
+ if (link->ipm_policy > ATA_IPM_MAX_POWER)
+ return 0;
+
+ /*
+ * Connection status might have changed while resetting other
+ * links, enable notification and check SATA_PMP_GSCR_ERROR
+ * before returning.
+ */
+
/* enable notification */
if (pmp_dev->flags & ATA_DFLAG_AN) {
gscr[SATA_PMP_GSCR_FEAT_EN] |= SATA_PMP_FEAT_NOTIFY;
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index a54273d..8801342 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -116,73 +116,55 @@ static struct scsi_transport_template ata_scsi_transport_template = {
.user_scan = ata_scsi_user_scan,
};

-
-static const struct {
- enum link_pm value;
- const char *name;
-} link_pm_policy[] = {
- { NOT_AVAILABLE, "max_performance" },
- { MIN_POWER, "min_power" },
- { MAX_PERFORMANCE, "max_performance" },
- { MEDIUM_POWER, "medium_power" },
+static const char *ata_ipm_policy_names[] = {
+ [ATA_IPM_UNKNOWN] = "max_performance",
+ [ATA_IPM_MAX_POWER] = "max_performance",
+ [ATA_IPM_MED_POWER] = "medium_power",
+ [ATA_IPM_MIN_POWER] = "min_power",
};

-static const char *ata_scsi_lpm_get(enum link_pm policy)
-{
- int i;
-
- for (i = 0; i < ARRAY_SIZE(link_pm_policy); i++)
- if (link_pm_policy[i].value == policy)
- return link_pm_policy[i].name;
-
- return NULL;
-}
-
-static ssize_t ata_scsi_lpm_put(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
+static ssize_t ata_scsi_ipm_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ata_port *ap = ata_shost_to_port(shost);
- enum link_pm policy = 0;
- int i;
+ enum ata_ipm_policy policy;
+ unsigned long flags;

- /*
- * we are skipping array location 0 on purpose - this
- * is because a value of NOT_AVAILABLE is displayed
- * to the user as max_performance, but when the user
- * writes "max_performance", they actually want the
- * value to match MAX_PERFORMANCE.
- */
- for (i = 1; i < ARRAY_SIZE(link_pm_policy); i++) {
- const int len = strlen(link_pm_policy[i].name);
- if (strncmp(link_pm_policy[i].name, buf, len) == 0) {
- policy = link_pm_policy[i].value;
+ /* UNKNOWN is internal state, iterate from MAX_POWER */
+ for (policy = ATA_IPM_MAX_POWER;
+ policy < ARRAY_SIZE(ata_ipm_policy_names); policy++) {
+ const char *name = ata_ipm_policy_names[policy];
+
+ if (strncmp(name, buf, strlen(name)) == 0)
break;
- }
}
- if (!policy)
+ if (policy == ARRAY_SIZE(ata_ipm_policy_names))
return -EINVAL;

- ata_lpm_schedule(ap, policy);
+ spin_lock_irqsave(ap->lock, flags);
+ ap->target_ipm_policy = policy;
+ ata_port_schedule_eh(ap);
+ spin_unlock_irqrestore(ap->lock, flags);
+
return count;
}

-static ssize_t
-ata_scsi_lpm_show(struct device *dev, struct device_attribute *attr, char *buf)
+static ssize_t ata_scsi_ipm_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ata_port *ap = ata_shost_to_port(shost);
- const char *policy =
- ata_scsi_lpm_get(ap->pm_policy);

- if (!policy)
+ if (ap->target_ipm_policy >= ARRAY_SIZE(ata_ipm_policy_names))
return -EINVAL;

- return snprintf(buf, 23, "%s\n", policy);
+ return snprintf(buf, PAGE_SIZE, "%s\n",
+ ata_ipm_policy_names[ap->target_ipm_policy]);
}
DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
- ata_scsi_lpm_show, ata_scsi_lpm_put);
+ ata_scsi_ipm_show, ata_scsi_ipm_store);
EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);

static ssize_t ata_scsi_park_show(struct device *device,
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 4b84ed6..2dd0dfe 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -87,6 +87,8 @@ extern int ata_dev_revalidate(struct ata_device *dev, unsigned int new_class,
extern int ata_dev_configure(struct ata_device *dev);
extern int sata_down_spd_limit(struct ata_link *link, u32 spd_limit);
extern int ata_down_xfermask_limit(struct ata_device *dev, unsigned int sel);
+extern unsigned int ata_dev_set_feature(struct ata_device *dev,
+ u8 enable, u8 feature);
extern void ata_sg_clean(struct ata_queued_cmd *qc);
extern void ata_qc_free(struct ata_queued_cmd *qc);
extern void ata_qc_issue(struct ata_queued_cmd *qc);
@@ -101,8 +103,6 @@ extern int sata_link_init_spd(struct ata_link *link);
extern int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg);
extern int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg);
extern struct ata_port *ata_port_alloc(struct ata_host *host);
-extern void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy);
-extern void ata_lpm_schedule(struct ata_port *ap, enum link_pm);

/* libata-acpi.c */
#ifdef CONFIG_ATA_ACPI
@@ -170,6 +170,8 @@ extern void ata_eh_finish(struct ata_port *ap);
#ifdef CONFIG_SATA_PMP
extern int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *val);
extern int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val);
+extern int sata_pmp_set_ipm(struct ata_link *link, enum ata_ipm_policy policy,
+ unsigned hints);
extern int sata_pmp_attach(struct ata_device *dev);
#else /* CONFIG_SATA_PMP */
static inline int sata_pmp_scr_read(struct ata_link *link, int reg, u32 *val)
@@ -182,6 +184,12 @@ static inline int sata_pmp_scr_write(struct ata_link *link, int reg, u32 val)
return -EINVAL;
}

+static inline int sata_pmp_set_ipm(struct ata_link *link,
+ enum ata_ipm_policy policy, unsigned hints)
+{
+ return -EINVAL;
+}
+
static inline int sata_pmp_attach(struct ata_device *dev)
{
return -EINVAL;
diff --git a/include/linux/libata.h b/include/linux/libata.h
index b85f3ff..1f90dc5 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -172,6 +172,7 @@ enum {
ATA_LFLAG_NO_RETRY = (1 << 5), /* don't retry this link */
ATA_LFLAG_DISABLED = (1 << 6), /* link is disabled */
ATA_LFLAG_SW_ACTIVITY = (1 << 7), /* keep activity stats */
+ ATA_LFLAG_NO_IPM = (1 << 8), /* disable IPM on this link */

/* struct ata_port flags */
ATA_FLAG_SLAVE_POSS = (1 << 0), /* host supports slave dev */
@@ -324,12 +325,11 @@ enum {
ATA_EH_HARDRESET = (1 << 2), /* meaningful only in ->prereset */
ATA_EH_RESET = ATA_EH_SOFTRESET | ATA_EH_HARDRESET,
ATA_EH_ENABLE_LINK = (1 << 3),
- ATA_EH_LPM = (1 << 4), /* link power management action */
ATA_EH_PARK = (1 << 5), /* unload heads and stop I/O */

ATA_EH_PERDEV_MASK = ATA_EH_REVALIDATE | ATA_EH_PARK,
ATA_EH_ALL_ACTIONS = ATA_EH_REVALIDATE | ATA_EH_RESET |
- ATA_EH_ENABLE_LINK | ATA_EH_LPM,
+ ATA_EH_ENABLE_LINK,

/* ata_eh_info->flags */
ATA_EHI_HOTPLUGGED = (1 << 0), /* could have been hotplugged */
@@ -376,7 +376,6 @@ enum {
ATA_HORKAGE_BROKEN_HPA = (1 << 4), /* Broken HPA */
ATA_HORKAGE_DISABLE = (1 << 5), /* Disable it */
ATA_HORKAGE_HPA_SIZE = (1 << 6), /* native size off by one */
- ATA_HORKAGE_IPM = (1 << 7), /* Link PM problems */
ATA_HORKAGE_IVB = (1 << 8), /* cbl det validity bit bugs */
ATA_HORKAGE_STUCK_ERR = (1 << 9), /* stuck ERR on next PACKET */
ATA_HORKAGE_BRIDGE_OK = (1 << 10), /* no bridge limits */
@@ -463,6 +462,22 @@ enum ata_completion_errors {
AC_ERR_NCQ = (1 << 10), /* marker for offending NCQ qc */
};

+/*
+ * Link pm policy: If you alter this, you also need to alter
+ * libata-scsi.c (for the ascii descriptions)
+ */
+enum ata_ipm_policy {
+ ATA_IPM_UNKNOWN,
+ ATA_IPM_MAX_POWER,
+ ATA_IPM_MED_POWER,
+ ATA_IPM_MIN_POWER,
+};
+
+enum ata_ipm_hints {
+ ATA_IPM_EMPTY = (1 << 0), /* port empty/probing */
+ ATA_IPM_HIPM = (1 << 1), /* may use HIPM */
+};
+
/* forward declarations */
struct scsi_device;
struct ata_port_operations;
@@ -477,16 +492,6 @@ typedef int (*ata_reset_fn_t)(struct ata_link *link, unsigned int *classes,
unsigned long deadline);
typedef void (*ata_postreset_fn_t)(struct ata_link *link, unsigned int *classes);

-/*
- * host pm policy: If you alter this, you also need to alter libata-scsi.c
- * (for the ascii descriptions)
- */
-enum link_pm {
- NOT_AVAILABLE,
- MIN_POWER,
- MAX_PERFORMANCE,
- MEDIUM_POWER,
-};
extern struct device_attribute dev_attr_link_power_management_policy;
extern struct device_attribute dev_attr_unload_heads;
extern struct device_attribute dev_attr_em_message_type;
@@ -698,6 +703,7 @@ struct ata_link {
unsigned int hw_sata_spd_limit;
unsigned int sata_spd_limit;
unsigned int sata_spd; /* current SATA PHY speed */
+ enum ata_ipm_policy ipm_policy;

/* record runtime error info, protected by host_set lock */
struct ata_eh_info eh_info;
@@ -764,7 +770,7 @@ struct ata_port {

pm_message_t pm_mesg;
int *pm_result;
- enum link_pm pm_policy;
+ enum ata_ipm_policy target_ipm_policy;

struct timer_list fastdrain_timer;
unsigned long fastdrain_cnt;
@@ -830,8 +836,8 @@ struct ata_port_operations {
int (*scr_write)(struct ata_link *link, unsigned int sc_reg, u32 val);
void (*pmp_attach)(struct ata_port *ap);
void (*pmp_detach)(struct ata_port *ap);
- int (*enable_pm)(struct ata_port *ap, enum link_pm policy);
- void (*disable_pm)(struct ata_port *ap);
+ int (*set_ipm)(struct ata_link *link, enum ata_ipm_policy policy,
+ unsigned hints);

/*
* Start, stop, suspend and resume
@@ -943,6 +949,8 @@ extern int sata_link_debounce(struct ata_link *link,
const unsigned long *params, unsigned long deadline);
extern int sata_link_resume(struct ata_link *link, const unsigned long *params,
unsigned long deadline);
+extern int sata_link_scr_ipm(struct ata_link *link, enum ata_ipm_policy policy,
+ bool spm_wakeup);
extern int sata_link_hardreset(struct ata_link *link,
const unsigned long *timing, unsigned long deadline,
bool *online, int (*check_ready)(struct ata_link *));

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  Last update: 2010-08-05 18:11    [from the cache]
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