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-rw-r--r--drivers/ata/libata-core.c196
-rw-r--r--drivers/ata/libata-eh.c4
-rw-r--r--drivers/ata/libata-scsi.c68
-rw-r--r--drivers/ata/libata.h2
4 files changed, 269 insertions, 1 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 3891cdc6bd3d..513babe6a143 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -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);
@@ -6361,6 +6546,12 @@ 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;
@@ -6383,6 +6574,9 @@ 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
@@ -6925,6 +7119,7 @@ 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;
@@ -7321,7 +7516,6 @@ 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);
diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index ec55d63cf20e..fefea7470e51 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -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;
diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index f752eddc19ed..93bd36c19690 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -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 *))
{
diff --git a/drivers/ata/libata.h b/drivers/ata/libata.h
index 90df58a3edc9..0e6cf3a484dc 100644
--- a/drivers/ata/libata.h
+++ b/drivers/ata/libata.h
@@ -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