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ata: add ata port system PM callbacks
Change ata_host_request_pm to ata_port_request_pm which performs port suspend/resume. Add ata port type driver which implements port PM callbacks. Signed-off-by: Lin Ming <ming.m.lin@intel.com> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
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54f5758846
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5ef4108291
@ -5234,112 +5234,116 @@ bool ata_link_offline(struct ata_link *link)
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}
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#ifdef CONFIG_PM
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static int ata_host_request_pm(struct ata_host *host, pm_message_t mesg,
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static int ata_port_request_pm(struct ata_port *ap, pm_message_t mesg,
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unsigned int action, unsigned int ehi_flags,
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int wait)
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{
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struct ata_link *link;
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unsigned long flags;
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int i, rc;
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int rc;
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for (i = 0; i < host->n_ports; i++) {
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struct ata_port *ap = host->ports[i];
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struct ata_link *link;
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/* Previous resume operation might still be in
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* progress. Wait for PM_PENDING to clear.
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*/
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if (ap->pflags & ATA_PFLAG_PM_PENDING) {
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ata_port_wait_eh(ap);
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WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
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}
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/* request PM ops to EH */
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spin_lock_irqsave(ap->lock, flags);
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ap->pm_mesg = mesg;
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if (wait) {
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rc = 0;
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ap->pm_result = &rc;
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}
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ap->pflags |= ATA_PFLAG_PM_PENDING;
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ata_for_each_link(link, ap, HOST_FIRST) {
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link->eh_info.action |= action;
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link->eh_info.flags |= ehi_flags;
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}
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ata_port_schedule_eh(ap);
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spin_unlock_irqrestore(ap->lock, flags);
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/* wait and check result */
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if (wait) {
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ata_port_wait_eh(ap);
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WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
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if (rc)
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return rc;
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}
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/* Previous resume operation might still be in
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* progress. Wait for PM_PENDING to clear.
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*/
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if (ap->pflags & ATA_PFLAG_PM_PENDING) {
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ata_port_wait_eh(ap);
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WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
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}
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return 0;
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/* request PM ops to EH */
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spin_lock_irqsave(ap->lock, flags);
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ap->pm_mesg = mesg;
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if (wait) {
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rc = 0;
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ap->pm_result = &rc;
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}
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ap->pflags |= ATA_PFLAG_PM_PENDING;
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ata_for_each_link(link, ap, HOST_FIRST) {
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link->eh_info.action |= action;
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link->eh_info.flags |= ehi_flags;
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}
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ata_port_schedule_eh(ap);
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spin_unlock_irqrestore(ap->lock, flags);
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/* wait and check result */
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if (wait) {
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ata_port_wait_eh(ap);
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WARN_ON(ap->pflags & ATA_PFLAG_PM_PENDING);
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}
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return rc;
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}
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#define to_ata_port(d) container_of(d, struct ata_port, tdev)
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static int ata_port_suspend_common(struct device *dev)
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{
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struct ata_port *ap = to_ata_port(dev);
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int rc;
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rc = ata_port_request_pm(ap, PMSG_SUSPEND, 0, ATA_EHI_QUIET, 1);
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return rc;
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}
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static int ata_port_suspend(struct device *dev)
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{
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if (pm_runtime_suspended(dev))
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return 0;
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return ata_port_suspend_common(dev);
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}
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static int ata_port_resume(struct device *dev)
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{
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struct ata_port *ap = to_ata_port(dev);
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int rc;
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rc = ata_port_request_pm(ap, PMSG_ON, ATA_EH_RESET,
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ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 1);
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return rc;
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}
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static const struct dev_pm_ops ata_port_pm_ops = {
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.suspend = ata_port_suspend,
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.resume = ata_port_resume,
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};
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/**
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* ata_host_suspend - suspend host
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* @host: host to suspend
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* @mesg: PM message
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*
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* Suspend @host. Actual operation is performed by EH. This
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* function requests EH to perform PM operations and waits for EH
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* to finish.
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*
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* LOCKING:
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* Kernel thread context (may sleep).
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*
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* RETURNS:
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* 0 on success, -errno on failure.
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* Suspend @host. Actual operation is performed by port suspend.
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*/
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int ata_host_suspend(struct ata_host *host, pm_message_t mesg)
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{
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unsigned int ehi_flags = ATA_EHI_QUIET;
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int rc;
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/*
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* On some hardware, device fails to respond after spun down
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* for suspend. As the device won't be used before being
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* resumed, we don't need to touch the device. Ask EH to skip
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* the usual stuff and proceed directly to suspend.
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*
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* http://thread.gmane.org/gmane.linux.ide/46764
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*/
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if (mesg.event == PM_EVENT_SUSPEND)
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ehi_flags |= ATA_EHI_NO_AUTOPSY | ATA_EHI_NO_RECOVERY;
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rc = ata_host_request_pm(host, mesg, 0, ehi_flags, 1);
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if (rc == 0)
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host->dev->power.power_state = mesg;
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return rc;
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host->dev->power.power_state = mesg;
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return 0;
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}
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/**
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* ata_host_resume - resume host
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* @host: host to resume
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*
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* Resume @host. Actual operation is performed by EH. This
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* function requests EH to perform PM operations and returns.
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* Note that all resume operations are performed parallelly.
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*
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* LOCKING:
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* Kernel thread context (may sleep).
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* Resume @host. Actual operation is performed by port resume.
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*/
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void ata_host_resume(struct ata_host *host)
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{
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ata_host_request_pm(host, PMSG_ON, ATA_EH_RESET,
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ATA_EHI_NO_AUTOPSY | ATA_EHI_QUIET, 0);
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host->dev->power.power_state = PMSG_ON;
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}
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#endif
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struct device_type ata_port_type = {
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.name = "ata_port",
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#ifdef CONFIG_PM
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.pm = &ata_port_pm_ops,
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#endif
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};
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/**
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* ata_dev_init - Initialize an ata_device structure
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* @dev: Device structure to initialize
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@ -279,6 +279,7 @@ int ata_tport_add(struct device *parent,
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struct device *dev = &ap->tdev;
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device_initialize(dev);
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dev->type = &ata_port_type;
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dev->parent = get_device(parent);
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dev->release = ata_tport_release;
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@ -58,6 +58,7 @@ extern int atapi_passthru16;
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extern int libata_fua;
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extern int libata_noacpi;
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extern int libata_allow_tpm;
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extern struct device_type ata_port_type;
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extern struct ata_link *ata_dev_phys_link(struct ata_device *dev);
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extern void ata_force_cbl(struct ata_port *ap);
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extern u64 ata_tf_to_lba(const struct ata_taskfile *tf);
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