diff options
| -rw-r--r-- | drivers/scsi/Kconfig | 3 | ||||
| -rw-r--r-- | drivers/scsi/scsi.c | 9 | ||||
| -rw-r--r-- | drivers/scsi/scsi_pm.c | 128 | ||||
| -rw-r--r-- | drivers/scsi/scsi_priv.h | 2 | ||||
| -rw-r--r-- | drivers/scsi/scsi_scan.c | 2 | ||||
| -rw-r--r-- | drivers/scsi/sd.c | 1 |
6 files changed, 115 insertions, 30 deletions
diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig index c8bd092fc945..02832d64d918 100644 --- a/drivers/scsi/Kconfig +++ b/drivers/scsi/Kconfig @@ -263,6 +263,9 @@ config SCSI_SCAN_ASYNC You can override this choice by specifying "scsi_mod.scan=sync" or async on the kernel's command line. + Note that this setting also affects whether resuming from + system suspend will be performed asynchronously. + menu "SCSI Transports" depends on SCSI diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index d8afec8317cf..1b345bf41a91 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -91,6 +91,15 @@ EXPORT_SYMBOL(scsi_logging_level); ASYNC_DOMAIN(scsi_sd_probe_domain); EXPORT_SYMBOL(scsi_sd_probe_domain); +/* + * Separate domain (from scsi_sd_probe_domain) to maximize the benefit of + * asynchronous system resume operations. It is marked 'exclusive' to avoid + * being included in the async_synchronize_full() that is invoked by + * dpm_resume() + */ +ASYNC_DOMAIN_EXCLUSIVE(scsi_sd_pm_domain); +EXPORT_SYMBOL(scsi_sd_pm_domain); + /* NB: These are exposed through /proc/scsi/scsi and form part of the ABI. * You may not alter any existing entry (although adding new ones is * encouraged once assigned by ANSI/INCITS T10 diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c index 001e9ceda4c3..7454498c4091 100644 --- a/drivers/scsi/scsi_pm.c +++ b/drivers/scsi/scsi_pm.c @@ -18,35 +18,77 @@ #ifdef CONFIG_PM_SLEEP -static int scsi_dev_type_suspend(struct device *dev, int (*cb)(struct device *)) +static int do_scsi_suspend(struct device *dev, const struct dev_pm_ops *pm) { + return pm && pm->suspend ? pm->suspend(dev) : 0; +} + +static int do_scsi_freeze(struct device *dev, const struct dev_pm_ops *pm) +{ + return pm && pm->freeze ? pm->freeze(dev) : 0; +} + +static int do_scsi_poweroff(struct device *dev, const struct dev_pm_ops *pm) +{ + return pm && pm->poweroff ? pm->poweroff(dev) : 0; +} + +static int do_scsi_resume(struct device *dev, const struct dev_pm_ops *pm) +{ + return pm && pm->resume ? pm->resume(dev) : 0; +} + +static int do_scsi_thaw(struct device *dev, const struct dev_pm_ops *pm) +{ + return pm && pm->thaw ? pm->thaw(dev) : 0; +} + +static int do_scsi_restore(struct device *dev, const struct dev_pm_ops *pm) +{ + return pm && pm->restore ? pm->restore(dev) : 0; +} + +static int scsi_dev_type_suspend(struct device *dev, + int (*cb)(struct device *, const struct dev_pm_ops *)) +{ + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; int err; + /* flush pending in-flight resume operations, suspend is synchronous */ + async_synchronize_full_domain(&scsi_sd_pm_domain); + err = scsi_device_quiesce(to_scsi_device(dev)); if (err == 0) { - if (cb) { - err = cb(dev); - if (err) - scsi_device_resume(to_scsi_device(dev)); - } + err = cb(dev, pm); + if (err) + scsi_device_resume(to_scsi_device(dev)); } dev_dbg(dev, "scsi suspend: %d\n", err); return err; } -static int scsi_dev_type_resume(struct device *dev, int (*cb)(struct device *)) +static int scsi_dev_type_resume(struct device *dev, + int (*cb)(struct device *, const struct dev_pm_ops *)) { + const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; int err = 0; - if (cb) - err = cb(dev); + err = cb(dev, pm); scsi_device_resume(to_scsi_device(dev)); dev_dbg(dev, "scsi resume: %d\n", err); + + if (err == 0) { + pm_runtime_disable(dev); + pm_runtime_set_active(dev); + pm_runtime_enable(dev); + } + return err; } static int -scsi_bus_suspend_common(struct device *dev, int (*cb)(struct device *)) +scsi_bus_suspend_common(struct device *dev, + int (*cb)(struct device *, const struct dev_pm_ops *)) { int err = 0; @@ -66,20 +108,54 @@ scsi_bus_suspend_common(struct device *dev, int (*cb)(struct device *)) return err; } -static int -scsi_bus_resume_common(struct device *dev, int (*cb)(struct device *)) +static void async_sdev_resume(void *dev, async_cookie_t cookie) { - int err = 0; + scsi_dev_type_resume(dev, do_scsi_resume); +} - if (scsi_is_sdev_device(dev)) - err = scsi_dev_type_resume(dev, cb); +static void async_sdev_thaw(void *dev, async_cookie_t cookie) +{ + scsi_dev_type_resume(dev, do_scsi_thaw); +} - if (err == 0) { +static void async_sdev_restore(void *dev, async_cookie_t cookie) +{ + scsi_dev_type_resume(dev, do_scsi_restore); +} + +static int scsi_bus_resume_common(struct device *dev, + int (*cb)(struct device *, const struct dev_pm_ops *)) +{ + async_func_t fn; + + if (!scsi_is_sdev_device(dev)) + fn = NULL; + else if (cb == do_scsi_resume) + fn = async_sdev_resume; + else if (cb == do_scsi_thaw) + fn = async_sdev_thaw; + else if (cb == do_scsi_restore) + fn = async_sdev_restore; + else + fn = NULL; + + if (fn) { + async_schedule_domain(fn, dev, &scsi_sd_pm_domain); + + /* + * If a user has disabled async probing a likely reason + * is due to a storage enclosure that does not inject + * staggered spin-ups. For safety, make resume + * synchronous as well in that case. + */ + if (strncmp(scsi_scan_type, "async", 5) != 0) + async_synchronize_full_domain(&scsi_sd_pm_domain); + } else { pm_runtime_disable(dev); pm_runtime_set_active(dev); pm_runtime_enable(dev); } - return err; + return 0; } static int scsi_bus_prepare(struct device *dev) @@ -97,38 +173,32 @@ static int scsi_bus_prepare(struct device *dev) static int scsi_bus_suspend(struct device *dev) { - const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; - return scsi_bus_suspend_common(dev, pm ? pm->suspend : NULL); + return scsi_bus_suspend_common(dev, do_scsi_suspend); } static int scsi_bus_resume(struct device *dev) { - const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; - return scsi_bus_resume_common(dev, pm ? pm->resume : NULL); + return scsi_bus_resume_common(dev, do_scsi_resume); } static int scsi_bus_freeze(struct device *dev) { - const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; - return scsi_bus_suspend_common(dev, pm ? pm->freeze : NULL); + return scsi_bus_suspend_common(dev, do_scsi_freeze); } static int scsi_bus_thaw(struct device *dev) { - const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; - return scsi_bus_resume_common(dev, pm ? pm->thaw : NULL); + return scsi_bus_resume_common(dev, do_scsi_thaw); } static int scsi_bus_poweroff(struct device *dev) { - const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; - return scsi_bus_suspend_common(dev, pm ? pm->poweroff : NULL); + return scsi_bus_suspend_common(dev, do_scsi_poweroff); } static int scsi_bus_restore(struct device *dev) { - const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL; - return scsi_bus_resume_common(dev, pm ? pm->restore : NULL); + return scsi_bus_resume_common(dev, do_scsi_restore); } #else /* CONFIG_PM_SLEEP */ diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h index f079a598bed4..48e5b657e79f 100644 --- a/drivers/scsi/scsi_priv.h +++ b/drivers/scsi/scsi_priv.h @@ -112,6 +112,7 @@ extern void scsi_exit_procfs(void); #endif /* CONFIG_PROC_FS */ /* scsi_scan.c */ +extern char scsi_scan_type[]; extern int scsi_complete_async_scans(void); extern int scsi_scan_host_selected(struct Scsi_Host *, unsigned int, unsigned int, unsigned int, int); @@ -166,6 +167,7 @@ static inline int scsi_autopm_get_host(struct Scsi_Host *h) { return 0; } static inline void scsi_autopm_put_host(struct Scsi_Host *h) {} #endif /* CONFIG_PM_RUNTIME */ +extern struct async_domain scsi_sd_pm_domain; extern struct async_domain scsi_sd_probe_domain; /* diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c index 307a81137607..6b2f51f52af6 100644 --- a/drivers/scsi/scsi_scan.c +++ b/drivers/scsi/scsi_scan.c @@ -97,7 +97,7 @@ MODULE_PARM_DESC(max_luns, #define SCSI_SCAN_TYPE_DEFAULT "sync" #endif -static char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT; +char scsi_scan_type[6] = SCSI_SCAN_TYPE_DEFAULT; module_param_string(scan, scsi_scan_type, sizeof(scsi_scan_type), S_IRUGO); MODULE_PARM_DESC(scan, "sync, async or none"); diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 470954aba728..700c595c603e 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -3020,6 +3020,7 @@ static int sd_remove(struct device *dev) devt = disk_devt(sdkp->disk); scsi_autopm_get_device(sdkp->device); + async_synchronize_full_domain(&scsi_sd_pm_domain); async_synchronize_full_domain(&scsi_sd_probe_domain); blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn); blk_queue_unprep_rq(sdkp->device->request_queue, NULL); |