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355 lines
8.0 KiB
355 lines
8.0 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* scsi_pm.c Copyright (C) 2010 Alan Stern |
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* |
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* SCSI dynamic Power Management |
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* Initial version: Alan Stern <[email protected]> |
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*/ |
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#include <linux/pm_runtime.h> |
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#include <linux/export.h> |
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#include <linux/async.h> |
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#include <linux/blk-pm.h> |
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#include <scsi/scsi.h> |
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#include <scsi/scsi_device.h> |
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#include <scsi/scsi_driver.h> |
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#include <scsi/scsi_host.h> |
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#include "scsi_priv.h" |
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#ifdef CONFIG_PM_SLEEP |
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static int do_scsi_suspend(struct device *dev, const struct dev_pm_ops *pm) |
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{ |
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return pm && pm->suspend ? pm->suspend(dev) : 0; |
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} |
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static int do_scsi_freeze(struct device *dev, const struct dev_pm_ops *pm) |
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{ |
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return pm && pm->freeze ? pm->freeze(dev) : 0; |
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} |
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static int do_scsi_poweroff(struct device *dev, const struct dev_pm_ops *pm) |
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{ |
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return pm && pm->poweroff ? pm->poweroff(dev) : 0; |
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} |
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static int do_scsi_resume(struct device *dev, const struct dev_pm_ops *pm) |
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{ |
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return pm && pm->resume ? pm->resume(dev) : 0; |
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} |
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static int do_scsi_thaw(struct device *dev, const struct dev_pm_ops *pm) |
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{ |
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return pm && pm->thaw ? pm->thaw(dev) : 0; |
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} |
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static int do_scsi_restore(struct device *dev, const struct dev_pm_ops *pm) |
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{ |
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return pm && pm->restore ? pm->restore(dev) : 0; |
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} |
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static int scsi_dev_type_suspend(struct device *dev, |
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int (*cb)(struct device *, const struct dev_pm_ops *)) |
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{ |
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
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int err; |
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/* flush pending in-flight resume operations, suspend is synchronous */ |
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async_synchronize_full_domain(&scsi_sd_pm_domain); |
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err = scsi_device_quiesce(to_scsi_device(dev)); |
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if (err == 0) { |
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err = cb(dev, pm); |
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if (err) |
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scsi_device_resume(to_scsi_device(dev)); |
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} |
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dev_dbg(dev, "scsi suspend: %d\n", err); |
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return err; |
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} |
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static int scsi_dev_type_resume(struct device *dev, |
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int (*cb)(struct device *, const struct dev_pm_ops *)) |
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{ |
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
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int err = 0; |
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err = cb(dev, pm); |
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scsi_device_resume(to_scsi_device(dev)); |
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dev_dbg(dev, "scsi resume: %d\n", err); |
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if (err == 0) { |
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pm_runtime_disable(dev); |
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err = pm_runtime_set_active(dev); |
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pm_runtime_enable(dev); |
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/* |
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* Forcibly set runtime PM status of request queue to "active" |
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* to make sure we can again get requests from the queue |
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* (see also blk_pm_peek_request()). |
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* |
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* The resume hook will correct runtime PM status of the disk. |
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*/ |
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if (!err && scsi_is_sdev_device(dev)) { |
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struct scsi_device *sdev = to_scsi_device(dev); |
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blk_set_runtime_active(sdev->request_queue); |
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} |
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} |
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return err; |
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} |
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static int |
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scsi_bus_suspend_common(struct device *dev, |
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int (*cb)(struct device *, const struct dev_pm_ops *)) |
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{ |
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int err = 0; |
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if (scsi_is_sdev_device(dev)) { |
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/* |
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* All the high-level SCSI drivers that implement runtime |
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* PM treat runtime suspend, system suspend, and system |
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* hibernate nearly identically. In all cases the requirements |
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* for runtime suspension are stricter. |
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*/ |
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if (pm_runtime_suspended(dev)) |
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return 0; |
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err = scsi_dev_type_suspend(dev, cb); |
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} |
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return err; |
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} |
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static void async_sdev_resume(void *dev, async_cookie_t cookie) |
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{ |
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scsi_dev_type_resume(dev, do_scsi_resume); |
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} |
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static void async_sdev_thaw(void *dev, async_cookie_t cookie) |
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{ |
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scsi_dev_type_resume(dev, do_scsi_thaw); |
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} |
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static void async_sdev_restore(void *dev, async_cookie_t cookie) |
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{ |
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scsi_dev_type_resume(dev, do_scsi_restore); |
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} |
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static int scsi_bus_resume_common(struct device *dev, |
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int (*cb)(struct device *, const struct dev_pm_ops *)) |
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{ |
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async_func_t fn; |
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if (!scsi_is_sdev_device(dev)) |
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fn = NULL; |
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else if (cb == do_scsi_resume) |
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fn = async_sdev_resume; |
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else if (cb == do_scsi_thaw) |
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fn = async_sdev_thaw; |
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else if (cb == do_scsi_restore) |
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fn = async_sdev_restore; |
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else |
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fn = NULL; |
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if (fn) { |
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async_schedule_domain(fn, dev, &scsi_sd_pm_domain); |
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/* |
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* If a user has disabled async probing a likely reason |
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* is due to a storage enclosure that does not inject |
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* staggered spin-ups. For safety, make resume |
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* synchronous as well in that case. |
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*/ |
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if (strncmp(scsi_scan_type, "async", 5) != 0) |
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async_synchronize_full_domain(&scsi_sd_pm_domain); |
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} else { |
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pm_runtime_disable(dev); |
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pm_runtime_set_active(dev); |
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pm_runtime_enable(dev); |
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} |
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return 0; |
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} |
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static int scsi_bus_prepare(struct device *dev) |
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{ |
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if (scsi_is_host_device(dev)) { |
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/* Wait until async scanning is finished */ |
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scsi_complete_async_scans(); |
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} |
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return 0; |
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} |
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static int scsi_bus_suspend(struct device *dev) |
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{ |
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return scsi_bus_suspend_common(dev, do_scsi_suspend); |
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} |
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static int scsi_bus_resume(struct device *dev) |
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{ |
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return scsi_bus_resume_common(dev, do_scsi_resume); |
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} |
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static int scsi_bus_freeze(struct device *dev) |
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{ |
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return scsi_bus_suspend_common(dev, do_scsi_freeze); |
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} |
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static int scsi_bus_thaw(struct device *dev) |
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{ |
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return scsi_bus_resume_common(dev, do_scsi_thaw); |
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} |
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static int scsi_bus_poweroff(struct device *dev) |
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{ |
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return scsi_bus_suspend_common(dev, do_scsi_poweroff); |
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} |
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static int scsi_bus_restore(struct device *dev) |
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{ |
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return scsi_bus_resume_common(dev, do_scsi_restore); |
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} |
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#else /* CONFIG_PM_SLEEP */ |
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#define scsi_bus_prepare NULL |
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#define scsi_bus_suspend NULL |
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#define scsi_bus_resume NULL |
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#define scsi_bus_freeze NULL |
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#define scsi_bus_thaw NULL |
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#define scsi_bus_poweroff NULL |
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#define scsi_bus_restore NULL |
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#endif /* CONFIG_PM_SLEEP */ |
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static int sdev_runtime_suspend(struct device *dev) |
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{ |
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
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struct scsi_device *sdev = to_scsi_device(dev); |
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int err = 0; |
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err = blk_pre_runtime_suspend(sdev->request_queue); |
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if (err) |
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return err; |
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if (pm && pm->runtime_suspend) |
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err = pm->runtime_suspend(dev); |
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blk_post_runtime_suspend(sdev->request_queue, err); |
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return err; |
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} |
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static int scsi_runtime_suspend(struct device *dev) |
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{ |
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int err = 0; |
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dev_dbg(dev, "scsi_runtime_suspend\n"); |
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if (scsi_is_sdev_device(dev)) |
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err = sdev_runtime_suspend(dev); |
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/* Insert hooks here for targets, hosts, and transport classes */ |
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return err; |
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} |
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static int sdev_runtime_resume(struct device *dev) |
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{ |
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struct scsi_device *sdev = to_scsi_device(dev); |
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; |
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int err = 0; |
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blk_pre_runtime_resume(sdev->request_queue); |
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if (pm && pm->runtime_resume) |
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err = pm->runtime_resume(dev); |
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blk_post_runtime_resume(sdev->request_queue, err); |
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return err; |
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} |
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static int scsi_runtime_resume(struct device *dev) |
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{ |
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int err = 0; |
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dev_dbg(dev, "scsi_runtime_resume\n"); |
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if (scsi_is_sdev_device(dev)) |
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err = sdev_runtime_resume(dev); |
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/* Insert hooks here for targets, hosts, and transport classes */ |
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return err; |
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} |
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static int scsi_runtime_idle(struct device *dev) |
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{ |
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dev_dbg(dev, "scsi_runtime_idle\n"); |
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/* Insert hooks here for targets, hosts, and transport classes */ |
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if (scsi_is_sdev_device(dev)) { |
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pm_runtime_mark_last_busy(dev); |
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pm_runtime_autosuspend(dev); |
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return -EBUSY; |
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} |
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return 0; |
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} |
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int scsi_autopm_get_device(struct scsi_device *sdev) |
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{ |
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int err; |
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err = pm_runtime_get_sync(&sdev->sdev_gendev); |
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if (err < 0 && err !=-EACCES) |
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pm_runtime_put_sync(&sdev->sdev_gendev); |
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else |
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err = 0; |
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return err; |
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} |
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EXPORT_SYMBOL_GPL(scsi_autopm_get_device); |
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void scsi_autopm_put_device(struct scsi_device *sdev) |
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{ |
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pm_runtime_put_sync(&sdev->sdev_gendev); |
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} |
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EXPORT_SYMBOL_GPL(scsi_autopm_put_device); |
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void scsi_autopm_get_target(struct scsi_target *starget) |
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{ |
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pm_runtime_get_sync(&starget->dev); |
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} |
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void scsi_autopm_put_target(struct scsi_target *starget) |
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{ |
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pm_runtime_put_sync(&starget->dev); |
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} |
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int scsi_autopm_get_host(struct Scsi_Host *shost) |
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{ |
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int err; |
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err = pm_runtime_get_sync(&shost->shost_gendev); |
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if (err < 0 && err !=-EACCES) |
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pm_runtime_put_sync(&shost->shost_gendev); |
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else |
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err = 0; |
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return err; |
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} |
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void scsi_autopm_put_host(struct Scsi_Host *shost) |
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{ |
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pm_runtime_put_sync(&shost->shost_gendev); |
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} |
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const struct dev_pm_ops scsi_bus_pm_ops = { |
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.prepare = scsi_bus_prepare, |
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.suspend = scsi_bus_suspend, |
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.resume = scsi_bus_resume, |
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.freeze = scsi_bus_freeze, |
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.thaw = scsi_bus_thaw, |
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.poweroff = scsi_bus_poweroff, |
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.restore = scsi_bus_restore, |
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.runtime_suspend = scsi_runtime_suspend, |
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.runtime_resume = scsi_runtime_resume, |
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.runtime_idle = scsi_runtime_idle, |
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};
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