diff options
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_hbadisc.c | 13 | ||||
| -rw-r--r-- | drivers/scsi/lpfc/lpfc_init.c | 109 |
2 files changed, 117 insertions, 5 deletions
diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c index 65fddf4ac3c..58ed6859c92 100644 --- a/drivers/scsi/lpfc/lpfc_hbadisc.c +++ b/drivers/scsi/lpfc/lpfc_hbadisc.c @@ -585,20 +585,25 @@ lpfc_do_work(void *p) set_user_nice(current, -20); phba->data_flags = 0; - while (1) { + while (!kthread_should_stop()) { /* wait and check worker queue activities */ rc = wait_event_interruptible(phba->work_waitq, (test_and_clear_bit(LPFC_DATA_READY, &phba->data_flags) || kthread_should_stop())); - BUG_ON(rc); - - if (kthread_should_stop()) + /* Signal wakeup shall terminate the worker thread */ + if (rc) { + lpfc_printf_log(phba, KERN_ERR, LOG_ELS, + "0433 Wakeup on signal: rc=x%x\n", rc); break; + } /* Attend pending lpfc data processing */ lpfc_work_done(phba); } + phba->worker_thread = NULL; + lpfc_printf_log(phba, KERN_INFO, LOG_ELS, + "0432 Worker thread stopped.\n"); return 0; } diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c index 1e2a9521853..b213d1d01fe 100644 --- a/drivers/scsi/lpfc/lpfc_init.c +++ b/drivers/scsi/lpfc/lpfc_init.c @@ -2708,7 +2708,7 @@ out: * @pdev: pointer to PCI device * * This routine is to be registered to the kernel's PCI subsystem. When an - * Emulex HBA is removed from PCI bus. It perform all the necessary cleanup + * Emulex HBA is removed from PCI bus, it performs all the necessary cleanup * for the HBA device to be removed from the PCI subsystem properly. **/ static void __devexit @@ -2785,6 +2785,111 @@ lpfc_pci_remove_one(struct pci_dev *pdev) } /** + * lpfc_pci_suspend_one: lpfc PCI func to suspend device for power management. + * @pdev: pointer to PCI device + * @msg: power management message + * + * This routine is to be registered to the kernel's PCI subsystem to support + * system Power Management (PM). When PM invokes this method, it quiesces the + * device by stopping the driver's worker thread for the device, turning off + * device's interrupt and DMA, and bring the device offline. Note that as the + * driver implements the minimum PM requirements to a power-aware driver's PM + * support for suspend/resume -- all the possible PM messages (SUSPEND, + * HIBERNATE, FREEZE) to the suspend() method call will be treated as SUSPEND + * and the driver will fully reinitialize its device during resume() method + * call, the driver will set device to PCI_D3hot state in PCI config space + * instead of setting it according to the @msg provided by the PM. + * + * Return code + * 0 - driver suspended the device + * Error otherwise + **/ +static int +lpfc_pci_suspend_one(struct pci_dev *pdev, pm_message_t msg) +{ + struct Scsi_Host *shost = pci_get_drvdata(pdev); + struct lpfc_hba *phba = ((struct lpfc_vport *)shost->hostdata)->phba; + + lpfc_printf_log(phba, KERN_INFO, LOG_INIT, + "0473 PCI device Power Management suspend.\n"); + + /* Bring down the device */ + lpfc_offline_prep(phba); + lpfc_offline(phba); + kthread_stop(phba->worker_thread); + + /* Disable interrupt from device */ + lpfc_disable_intr(phba); + + /* Save device state to PCI config space */ + pci_save_state(pdev); + pci_set_power_state(pdev, PCI_D3hot); + + return 0; +} + +/** + * lpfc_pci_resume_one: lpfc PCI func to resume device for power management. + * @pdev: pointer to PCI device + * + * This routine is to be registered to the kernel's PCI subsystem to support + * system Power Management (PM). When PM invokes this method, it restores + * the device's PCI config space state and fully reinitializes the device + * and brings it online. Note that as the driver implements the minimum PM + * requirements to a power-aware driver's PM for suspend/resume -- all + * the possible PM messages (SUSPEND, HIBERNATE, FREEZE) to the suspend() + * method call will be treated as SUSPEND and the driver will fully + * reinitialize its device during resume() method call, the device will be + * set to PCI_D0 directly in PCI config space before restoring the state. + * + * Return code + * 0 - driver suspended the device + * Error otherwise + **/ +static int +lpfc_pci_resume_one(struct pci_dev *pdev) +{ + struct Scsi_Host *shost = pci_get_drvdata(pdev); + struct lpfc_hba *phba = ((struct lpfc_vport *)shost->hostdata)->phba; + int error; + + lpfc_printf_log(phba, KERN_INFO, LOG_INIT, + "0452 PCI device Power Management resume.\n"); + + /* Restore device state from PCI config space */ + pci_set_power_state(pdev, PCI_D0); + pci_restore_state(pdev); + if (pdev->is_busmaster) + pci_set_master(pdev); + + /* Startup the kernel thread for this host adapter. */ + phba->worker_thread = kthread_run(lpfc_do_work, phba, + "lpfc_worker_%d", phba->brd_no); + if (IS_ERR(phba->worker_thread)) { + error = PTR_ERR(phba->worker_thread); + lpfc_printf_log(phba, KERN_ERR, LOG_INIT, + "0434 PM resume failed to start worker " + "thread: error=x%x.\n", error); + return error; + } + + /* Enable interrupt from device */ + error = lpfc_enable_intr(phba); + if (error) { + lpfc_printf_log(phba, KERN_ERR, LOG_INIT, + "0430 PM resume Failed to enable interrupt: " + "error=x%x.\n", error); + return error; + } + + /* Restart HBA and bring it online */ + lpfc_sli_brdrestart(phba); + lpfc_online(phba); + + return 0; +} + +/** * lpfc_io_error_detected: Driver method for handling PCI I/O error detected. * @pdev: pointer to PCI device. * @state: the current PCI connection state. @@ -3036,6 +3141,8 @@ static struct pci_driver lpfc_driver = { .id_table = lpfc_id_table, .probe = lpfc_pci_probe_one, .remove = __devexit_p(lpfc_pci_remove_one), + .suspend = lpfc_pci_suspend_one, + .resume = lpfc_pci_resume_one, .err_handler = &lpfc_err_handler, }; |