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libata: clean up lpm related symbols and sysfs show/store functions

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Link power management related symbols are in confusing state w/ mixed
usages of lpm, ipm and pm.  This patch cleans up lpm related symbols
and sysfs show/store functions as follows.

* lpm states - NOT_AVAILABLE, MIN_POWER, MAX_PERFORMANCE and
  MEDIUM_POWER are renamed to ATA_LPM_UNKNOWN and
  ATA_LPM_{MIN|MAX|MED}_POWER.

* Pre/postfixes are unified to lpm.

* sysfs show/store functions for link_power_management_policy were
  curiously named get/put and unnecessarily complex.  Renamed to
  show/store and simplified.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Tejun Heo 2010-09-01 17:50:04 +02:00 committed by Jeff Garzik
parent c43d559f04
commit c93b263e0d
9 changed files with 79 additions and 100 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/ata/ahci.c
View File

@ -1209,7 +1209,7 @@ static int ahci_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
0x100 + ap->port_no * 0x80, "port");
/* set initial link pm policy */
ap->pm_policy = NOT_AVAILABLE;
ap->lpm_policy = ATA_LPM_UNKNOWN;
/* set enclosure management message type */
if (ap->flags & ATA_FLAG_EM)

2
drivers/ata/ahci.h
View File

@ -216,7 +216,7 @@ enum {
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_IPM,
ATA_FLAG_LPM,
ICH_MAP = 0x90, /* ICH MAP register */

2
drivers/ata/ahci_platform.c
View File

@ -130,7 +130,7 @@ static int __init ahci_probe(struct platform_device *pdev)
ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
/* set initial link pm policy */
ap->pm_policy = NOT_AVAILABLE;
ap->lpm_policy = ATA_LPM_UNKNOWN;
/* set enclosure management message type */
if (ap->flags & ATA_FLAG_EM)

20
drivers/ata/libahci.c
View File

@ -56,8 +56,7 @@ 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 int ahci_enable_alpm(struct ata_port *ap, enum ata_lpm_policy policy);
static void ahci_disable_alpm(struct ata_port *ap);
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,
@ -649,7 +648,7 @@ static void ahci_disable_alpm(struct ata_port *ap)
u32 cmd;
struct ahci_port_priv *pp = ap->private_data;
/* IPM bits should be disabled by libata-core */
/* LPM bits should be disabled by libata-core */
/* get the existing command bits */
cmd = readl(port_mmio + PORT_CMD);
@ -691,8 +690,7 @@ static void ahci_disable_alpm(struct ata_port *ap)
*/
}
static int ahci_enable_alpm(struct ata_port *ap,
enum link_pm policy)
static int ahci_enable_alpm(struct ata_port *ap, enum ata_lpm_policy policy)
{
struct ahci_host_priv *hpriv = ap->host->private_data;
void __iomem *port_mmio = ahci_port_base(ap);
@ -705,21 +703,21 @@ static int ahci_enable_alpm(struct ata_port *ap,
return -EINVAL;
switch (policy) {
case MAX_PERFORMANCE:
case NOT_AVAILABLE:
case ATA_LPM_MAX_POWER:
case ATA_LPM_UNKNOWN:
/*
* if we came here with NOT_AVAILABLE,
* if we came here with ATA_LPM_UNKNOWN,
* 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:
case ATA_LPM_MIN_POWER:
/* configure HBA to enter SLUMBER */
asp = PORT_CMD_ASP;
break;
case MEDIUM_POWER:
case ATA_LPM_MED_POWER:
/* configure HBA to enter PARTIAL */
asp = 0;
break;
@ -762,7 +760,7 @@ static int ahci_enable_alpm(struct ata_port *ap,
writel(cmd, port_mmio + PORT_CMD);
cmd = readl(port_mmio + PORT_CMD);
/* IPM bits should be set by libata-core */
/* LPM bits should be set by libata-core */
return 0;
}

50
drivers/ata/libata-core.c
View File

@ -1030,7 +1030,7 @@ 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)
static int ata_dev_set_dipm(struct ata_device *dev, enum ata_lpm_policy policy)
{
struct ata_link *link = dev->link;
struct ata_port *ap = link->ap;
@ -1040,14 +1040,14 @@ static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
/*
* disallow DIPM for drivers which haven't set
* ATA_FLAG_IPM. This is because when DIPM is enabled,
* ATA_FLAG_LPM. 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;
if (!(ap->flags & ATA_FLAG_LPM) || !ata_dev_enabled(dev)) {
ap->lpm_policy = ATA_LPM_UNKNOWN;
return -EINVAL;
}
@ -1066,8 +1066,8 @@ static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
return rc;
switch (policy) {
case MIN_POWER:
/* no restrictions on IPM transitions */
case ATA_LPM_MIN_POWER:
/* no restrictions on LPM transitions */
scontrol &= ~(0x3 << 8);
rc = sata_scr_write(link, SCR_CONTROL, scontrol);
if (rc)
@ -1078,8 +1078,8 @@ static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
err_mask = ata_dev_set_feature(dev,
SETFEATURES_SATA_ENABLE, SATA_DIPM);
break;
case MEDIUM_POWER:
/* allow IPM to PARTIAL */
case ATA_LPM_MED_POWER:
/* allow LPM to PARTIAL */
scontrol &= ~(0x1 << 8);
scontrol |= (0x2 << 8);
rc = sata_scr_write(link, SCR_CONTROL, scontrol);
@ -1087,21 +1087,21 @@ static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
return rc;
/*
* we don't have to disable DIPM since IPM flags
* we don't have to disable DIPM since LPM 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 */
case ATA_LPM_UNKNOWN:
case ATA_LPM_MAX_POWER:
/* disable all LPM 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
* we don't have to disable DIPM since LPM flags
* disallow all transitions which effectively
* disable DIPM anyway.
*/
@ -1125,9 +1125,9 @@ static int ata_dev_set_dipm(struct ata_device *dev, enum link_pm policy)
* enabling Host Initiated Power management.
*
* Locking: Caller.
* Returns: -EINVAL if IPM is not supported, 0 otherwise.
* Returns: -EINVAL if LPM is not supported, 0 otherwise.
*/
void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
void ata_dev_enable_pm(struct ata_device *dev, enum ata_lpm_policy policy)
{
int rc = 0;
struct ata_port *ap = dev->link->ap;
@ -1141,9 +1141,9 @@ void ata_dev_enable_pm(struct ata_device *dev, enum link_pm policy)
enable_pm_out:
if (rc)
ap->pm_policy = MAX_PERFORMANCE;
ap->lpm_policy = ATA_LPM_MAX_POWER;
else
ap->pm_policy = policy;
ap->lpm_policy = policy;
return /* rc */; /* hopefully we can use 'rc' eventually */
}
@ -1164,15 +1164,15 @@ static void ata_dev_disable_pm(struct ata_device *dev)
{
struct ata_port *ap = dev->link->ap;
ata_dev_set_dipm(dev, MAX_PERFORMANCE);
ata_dev_set_dipm(dev, ATA_LPM_MAX_POWER);
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)
void ata_lpm_schedule(struct ata_port *ap, enum ata_lpm_policy policy)
{
ap->pm_policy = policy;
ap->lpm_policy = policy;
ap->link.eh_info.action |= ATA_EH_LPM;
ap->link.eh_info.flags |= ATA_EHI_NO_AUTOPSY;
ata_port_schedule_eh(ap);
@ -1201,7 +1201,7 @@ static void ata_lpm_disable(struct ata_host *host)
for (i = 0; i < host->n_ports; i++) {
struct ata_port *ap = host->ports[i];
ata_lpm_schedule(ap, ap->pm_policy);
ata_lpm_schedule(ap, ap->lpm_policy);
}
}
#endif /* CONFIG_PM */
@ -2564,7 +2564,7 @@ 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 (!(dev->horkage & ATA_HORKAGE_LPM)) {
if (ata_id_has_hipm(dev->id))
dev->flags |= ATA_DFLAG_HIPM;
if (ata_id_has_dipm(dev->id))
@ -2591,11 +2591,11 @@ 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;
if (ata_dev_blacklisted(dev) & ATA_HORKAGE_LPM) {
dev->horkage |= ATA_HORKAGE_LPM;
/* reset link pm_policy for this port to no pm */
ap->pm_policy = MAX_PERFORMANCE;
ap->lpm_policy = ATA_LPM_MAX_POWER;
}
if (ap->ops->dev_config)

2
drivers/ata/libata-eh.c
View File

@ -3570,7 +3570,7 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
/* 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);
ata_dev_enable_pm(dev, ap->lpm_policy);
/* this link is okay now */
ehc->i.flags = 0;

66
drivers/ata/libata-scsi.c
View File

@ -103,72 +103,50 @@ static const u8 def_control_mpage[CONTROL_MPAGE_LEN] = {
0, 30 /* extended self test time, see 05-359r1 */
};
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_lpm_policy_names[] = {
[ATA_LPM_UNKNOWN] = "max_performance",
[ATA_LPM_MAX_POWER] = "max_performance",
[ATA_LPM_MED_POWER] = "medium_power",
[ATA_LPM_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_lpm_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_lpm_policy policy;
/*
* 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_LPM_MAX_POWER;
policy < ARRAY_SIZE(ata_lpm_policy_names); policy++) {
const char *name = ata_lpm_policy_names[policy];
if (strncmp(name, buf, strlen(name)) == 0)
break;
}
}
if (!policy)
if (policy == ARRAY_SIZE(ata_lpm_policy_names))
return -EINVAL;
ata_lpm_schedule(ap, policy);
return count;
}
static ssize_t
ata_scsi_lpm_show(struct device *dev, struct device_attribute *attr, char *buf)
static ssize_t ata_scsi_lpm_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->lpm_policy >= ARRAY_SIZE(ata_lpm_policy_names))
return -EINVAL;
return snprintf(buf, 23, "%s\n", policy);
return snprintf(buf, PAGE_SIZE, "%s\n",
ata_lpm_policy_names[ap->lpm_policy]);
}
DEVICE_ATTR(link_power_management_policy, S_IRUGO | S_IWUSR,
ata_scsi_lpm_show, ata_scsi_lpm_put);
ata_scsi_lpm_show, ata_scsi_lpm_store);
EXPORT_SYMBOL_GPL(dev_attr_link_power_management_policy);
static ssize_t ata_scsi_park_show(struct device *device,

6
drivers/ata/libata.h
View File

@ -100,8 +100,10 @@ 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);
extern void ata_dev_enable_pm(struct ata_device *dev,
enum ata_lpm_policy policy);
extern void ata_lpm_schedule(struct ata_port *ap,
enum ata_lpm_policy policy);
extern const char *sata_spd_string(unsigned int spd);
/* libata-acpi.c */

29
include/linux/libata.h
View File

@ -196,7 +196,7 @@ 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 */
ATA_FLAG_LPM = (1 << 20), /* driver can handle LPM */
ATA_FLAG_EM = (1 << 21), /* driver supports enclosure
* management */
ATA_FLAG_SW_ACTIVITY = (1 << 22), /* driver supports sw activity
@ -377,7 +377,7 @@ 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_LPM = (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 */
@ -464,6 +464,17 @@ enum ata_completion_errors {
AC_ERR_NCQ = (1 << 10), /* marker for offending NCQ qc */
};
/*
* Link power management policy: If you alter this, you also need to
* alter libata-scsi.c (for the ascii descriptions)
*/
enum ata_lpm_policy {
ATA_LPM_UNKNOWN,
ATA_LPM_MAX_POWER,
ATA_LPM_MED_POWER,
ATA_LPM_MIN_POWER,
};
/* forward declarations */
struct scsi_device;
struct ata_port_operations;
@ -478,16 +489,6 @@ 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;
@ -772,7 +773,7 @@ struct ata_port {
pm_message_t pm_mesg;
int *pm_result;
enum link_pm pm_policy;
enum ata_lpm_policy lpm_policy;
struct timer_list fastdrain_timer;
unsigned long fastdrain_cnt;
@ -838,7 +839,7 @@ 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);
int (*enable_pm)(struct ata_port *ap, enum ata_lpm_policy policy);
void (*disable_pm)(struct ata_port *ap);
/*