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Merge branch 'alpm' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev

Browse source 
* 'alpm' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/libata-dev:
  [libata] AHCI: add hw link power management support
  [libata] Link power management infrastructure
This commit is contained in:
Linus Torvalds 2007-10-29 12:12:34 -07:00
commit 3529a23342
8 changed files with 484 additions and 4 deletions
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19
Documentation/scsi/link_power_management_policy.txt Normal file
View file

@ -0,0 +1,19 @@
This parameter allows the user to set the link (interface) power management.
There are 3 possible options:
Value Effect
----------------------------------------------------------------------------
min_power Tell the controller to try to make the link use the
least possible power when possible. This may
sacrifice some performance due to increased latency
when coming out of lower power states.
max_performance Generally, this means no power management. Tell
the controller to have performance be a priority
over power management.
medium_power Tell the controller to enter a lower power state
when possible, but do not enter the lowest power
state, thus improving latency over min_power setting.

157
drivers/ata/ahci.c
View file

@ -49,6 +49,9 @@
#define DRV_NAME "ahci"
#define DRV_VERSION "3.0"
static int ahci_enable_alpm(struct ata_port *ap,
enum link_pm policy);
static void ahci_disable_alpm(struct ata_port *ap);
enum {
AHCI_PCI_BAR = 5,
@ -99,6 +102,7 @@ enum {
HOST_CAP_SSC = (1 << 14), /* Slumber capable */
HOST_CAP_PMP = (1 << 17), /* Port Multiplier support */
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 */
@ -155,6 +159,8 @@ 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_PMP = (1 << 17), /* PMP attached */
PORT_CMD_LIST_ON = (1 << 15), /* cmd list DMA engine running */
@ -178,13 +184,14 @@ 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 */
/* ap->flags bits */
AHCI_FLAG_NO_HOTPLUG = (1 << 24), /* ignore PxSERR.DIAG.N */
AHCI_FLAG_COMMON = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY |
ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA |
ATA_FLAG_ACPI_SATA | ATA_FLAG_AN,
ATA_FLAG_ACPI_SATA | ATA_FLAG_AN |
ATA_FLAG_IPM,
AHCI_LFLAG_COMMON = ATA_LFLAG_SKIP_D2H_BSY,
};
@ -254,6 +261,11 @@ static int ahci_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg);
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,
@ -271,6 +283,7 @@ static struct scsi_host_template ahci_sht = {
.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 = {
@ -302,6 +315,8 @@ static const struct ata_port_operations ahci_ops = {
.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,
@ -836,6 +851,130 @@ 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)
{
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, 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;
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);
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;
}
/*
* 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
*/
hpriv->flags |= AHCI_HFLAG_NO_HOTPLUG;
/* get the existing command bits */
cmd = readl(port_mmio + PORT_CMD);
/*
* 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);
/* IPM bits should be set by libata-core */
return 0;
}
#ifdef CONFIG_PM
static void ahci_power_down(struct ata_port *ap)
{
@ -1504,6 +1643,17 @@ 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)) {
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;
@ -2151,6 +2301,9 @@ 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;
/* standard SATA port setup */
if (hpriv->port_map & (1 << i))
ap->ioaddr.cmd_addr = port_mmio;

196
drivers/ata/libata-core.c
View file

@ -620,6 +620,177 @@ void ata_dev_disable(struct ata_device *dev)
}
}
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;
/* disable DIPM */
if (ata_dev_enabled(dev) && (dev->flags & ATA_DFLAG_DIPM))
err_mask = ata_dev_set_feature(dev,
SETFEATURES_SATA_DISABLE, SATA_DIPM);
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;
/* disable DIPM */
if (ata_dev_enabled(dev) && (dev->flags & ATA_DFLAG_DIPM))
err_mask = ata_dev_set_feature(dev,
SETFEATURES_SATA_DISABLE, SATA_DIPM);
break;
}
/* FIXME: handle SET FEATURES failure */
(void) err_mask;
return 0;
}
/**
* ata_dev_enable_pm - enable SATA interface power management
* @device - device to enable ipm for
* @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 */
}
/**
* ata_dev_disable_pm - disable SATA interface power management
* @device - device to enable ipm for
*
* 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);
}
void ata_lpm_schedule(struct ata_port *ap, enum link_pm policy)
{
ap->pm_policy = policy;
ap->link.eh_info.action |= ATA_EHI_LPM;
ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
ata_port_schedule_eh(ap);
}
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_port_for_each_link(link, ap) {
ata_link_for_each_dev(dev, link)
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);
}
}
/**
* ata_devchk - PATA device presence detection
* @ap: ATA channel to examine
@ -2101,6 +2272,13 @@ 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;
}
if (dev->horkage & ATA_HORKAGE_DIAGNOSTIC) {
/* Let the user know. We don't want to disallow opens for
rescue purposes, or in case the vendor is just a blithering
@ -2126,6 +2304,13 @@ 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);
@ -6362,6 +6547,12 @@ 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;
@ -6384,6 +6575,9 @@ void ata_host_resume(struct ata_host *host)
ata_host_request_pm(host, PMSG_ON, ATA_EH_SOFTRESET,
ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
host->dev->power.power_state = PMSG_ON;
/* reenable link pm */
ata_lpm_disable(host);
}
#endif
@ -6926,6 +7120,7 @@ int ata_host_register(struct ata_host *host, struct scsi_host_template *sht)
struct ata_port *ap = host->ports[i];
ata_scsi_scan_host(ap, 1);
ata_lpm_schedule(ap, ap->pm_policy);
}
return 0;
@ -7322,7 +7517,6 @@ const struct ata_port_info ata_dummy_port_info = {
* likely to change as new drivers are added and updated.
* Do not depend on ABI/API stability.
*/
EXPORT_SYMBOL_GPL(sata_deb_timing_normal);
EXPORT_SYMBOL_GPL(sata_deb_timing_hotplug);
EXPORT_SYMBOL_GPL(sata_deb_timing_long);

4
drivers/ata/libata-eh.c
View file

@ -2628,6 +2628,10 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
ehc->i.flags &= ~ATA_EHI_SETMODE;
}
if (ehc->i.action & ATA_EHI_LPM)
ata_link_for_each_dev(dev, link)
ata_dev_enable_pm(dev, ap->pm_policy);
/* this link is okay now */
ehc->i.flags = 0;
continue;

68
drivers/ata/libata-scsi.c
View file

@ -110,6 +110,74 @@ static struct scsi_transport_template ata_scsi_transport_template = {
};
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" },
};
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 class_device *class_dev,
const char *buf, size_t count)
{
struct Scsi_Host *shost = class_to_shost(class_dev);
struct ata_port *ap = ata_shost_to_port(shost);
enum link_pm policy = 0;
int i;
/*
* 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 &&
buf[len] == '\n') {
policy = link_pm_policy[i].value;
break;
}
}
if (!policy)
return -EINVAL;
ata_lpm_schedule(ap, policy);
return count;
}
static ssize_t
ata_scsi_lpm_show(struct class_device *class_dev, char *buf)
{
struct Scsi_Host *shost = class_to_shost(class_dev);
struct ata_port *ap = ata_shost_to_port(shost);
const char *policy =
ata_scsi_lpm_get(ap->pm_policy);
if (!policy)
return -EINVAL;
return snprintf(buf, 23, "%s\n", policy);
}
CLASS_DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
ata_scsi_lpm_show, ata_scsi_lpm_put);
EXPORT_SYMBOL_GPL(class_device_attr_link_power_management_policy);
static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
void (*done)(struct scsi_cmnd *))
{

2
drivers/ata/libata.h
View file

@ -101,6 +101,8 @@ 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

21
include/linux/ata.h
View file

@ -236,6 +236,7 @@ enum {
/* SETFEATURE Sector counts for SATA features */
SATA_AN = 0x05, /* Asynchronous Notification */
SATA_DIPM = 0x03, /* Device Initiated Power Management */
/* ATAPI stuff */
ATAPI_PKT_DMA = (1 << 0),
@ -378,6 +379,26 @@ struct ata_taskfile {
#define ata_id_cdb_intr(id) (((id)[0] & 0x60) == 0x20)
static inline bool ata_id_has_hipm(const u16 *id)
{
u16 val = id[76];
if (val == 0 || val == 0xffff)
return false;
return val & (1 << 9);
}
static inline bool ata_id_has_dipm(const u16 *id)
{
u16 val = id[78];
if (val == 0 || val == 0xffff)
return false;
return val & (1 << 3);
}
static inline int ata_id_has_fua(const u16 *id)
{
if ((id[84] & 0xC000) != 0x4000)

21
include/linux/libata.h
View file

@ -133,6 +133,8 @@ enum {
ATA_DFLAG_ACPI_PENDING = (1 << 5), /* ACPI resume action pending */
ATA_DFLAG_ACPI_FAILED = (1 << 6), /* ACPI on devcfg has failed */
ATA_DFLAG_AN = (1 << 7), /* AN configured */
ATA_DFLAG_HIPM = (1 << 8), /* device supports HIPM */
ATA_DFLAG_DIPM = (1 << 9), /* device supports DIPM */
ATA_DFLAG_CFG_MASK = (1 << 12) - 1,
ATA_DFLAG_PIO = (1 << 12), /* device limited to PIO mode */
@ -186,6 +188,7 @@ enum {
ATA_FLAG_ACPI_SATA = (1 << 17), /* need native SATA ACPI layout */
ATA_FLAG_AN = (1 << 18), /* controller supports AN */
ATA_FLAG_PMP = (1 << 19), /* controller supports PMP */
ATA_FLAG_IPM = (1 << 20), /* driver can handle IPM */
/* The following flag belongs to ap->pflags but is kept in
* ap->flags because it's referenced in many LLDs and will be
@ -302,6 +305,7 @@ enum {
ATA_EHI_RESUME_LINK = (1 << 1), /* resume link (reset modifier) */
ATA_EHI_NO_AUTOPSY = (1 << 2), /* no autopsy */
ATA_EHI_QUIET = (1 << 3), /* be quiet */
ATA_EHI_LPM = (1 << 4), /* link power management action */
ATA_EHI_DID_SOFTRESET = (1 << 16), /* already soft-reset this port */
ATA_EHI_DID_HARDRESET = (1 << 17), /* already soft-reset this port */
@ -333,6 +337,7 @@ enum {
ATA_HORKAGE_BROKEN_HPA = (1 << 4), /* Broken HPA */
ATA_HORKAGE_SKIP_PM = (1 << 5), /* Skip PM operations */
ATA_HORKAGE_HPA_SIZE = (1 << 6), /* native size off by one */
ATA_HORKAGE_IPM = (1 << 7), /* Link PM problems */
/* DMA mask for user DMA control: User visible values; DO NOT
renumber */
@ -378,6 +383,18 @@ 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 class_device_attribute class_device_attr_link_power_management_policy;
struct ata_ioports {
void __iomem *cmd_addr;
void __iomem *data_addr;
@ -624,6 +641,7 @@ struct ata_port {
pm_message_t pm_mesg;
int *pm_result;
enum link_pm pm_policy;
struct timer_list fastdrain_timer;
unsigned long fastdrain_cnt;
@ -691,7 +709,8 @@ struct ata_port_operations {
int (*port_suspend) (struct ata_port *ap, pm_message_t mesg);
int (*port_resume) (struct ata_port *ap);
int (*enable_pm) (struct ata_port *ap, enum link_pm policy);
void (*disable_pm) (struct ata_port *ap);
int (*port_start) (struct ata_port *ap);
void (*port_stop) (struct ata_port *ap);