From 21e6ba3f0e0257cce1a226c1f15e0a8ba4338ca3 Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Wed, 20 Mar 2019 13:09:19 -0700 Subject: [PATCH] scsi: sd: Rely on the driver core for asynchronous probing As explained during the 2018 LSF/MM session about increasing SCSI disk probing concurrency, the problems with the current probing approach are as follows: - The driver core is unaware of asynchronous SCSI LUN probing. wait_for_device_probe() waits for all asynchronous probes except asynchronous SCSI disk probes. - There is unnecessary serialization between sd_probe() and sd_remove(). This can lead to a deadlock. Hence this patch that modifies the sd driver such that it uses the driver core framework for asynchronous probing. The async domains and get_device()/put_device() pairs that became superfluous due to this change are removed. This patch does not affect the time needed for loading the scsi_debug kernel module with parameters delay=0 and max_luns=256. This patch depends on commit ef0ff68351be ("driver core: Probe devices asynchronously instead of the driver") that went upstream in kernel version v5.1-rc1. Cc: Lee Duncan Cc: Hannes Reinecke Cc: Luis Chamberlain Cc: Johannes Thumshirn Cc: Christoph Hellwig Cc: Greg Kroah-Hartman Cc: Dan Williams Signed-off-by: Bart Van Assche Signed-off-by: Martin K. Petersen --- drivers/scsi/scsi.c | 14 -------------- drivers/scsi/scsi_pm.c | 22 ++-------------------- drivers/scsi/scsi_priv.h | 3 --- drivers/scsi/sd.c | 13 +++---------- 4 files changed, 5 insertions(+), 47 deletions(-) diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 99a7b9f520ae..41b25486e303 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -85,19 +85,6 @@ unsigned int scsi_logging_level; EXPORT_SYMBOL(scsi_logging_level); #endif -/* sd, scsi core and power management need to coordinate flushing async actions */ -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); - /** * scsi_put_command - Free a scsi command block * @cmd: command block to free @@ -820,7 +807,6 @@ static void __exit exit_scsi(void) scsi_exit_devinfo(); scsi_exit_procfs(); scsi_exit_queue(); - async_unregister_domain(&scsi_sd_probe_domain); } subsys_initcall(init_scsi); diff --git a/drivers/scsi/scsi_pm.c b/drivers/scsi/scsi_pm.c index 7639df91b110..560baaad71d5 100644 --- a/drivers/scsi/scsi_pm.c +++ b/drivers/scsi/scsi_pm.c @@ -55,9 +55,6 @@ static int scsi_dev_type_suspend(struct device *dev, 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) { err = cb(dev, pm); @@ -154,18 +151,7 @@ static int scsi_bus_resume_common(struct device *dev, 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 { + if (!fn) { pm_runtime_disable(dev); pm_runtime_set_active(dev); pm_runtime_enable(dev); @@ -175,11 +161,7 @@ static int scsi_bus_resume_common(struct device *dev, static int scsi_bus_prepare(struct device *dev) { - if (scsi_is_sdev_device(dev)) { - /* sd probing uses async_schedule. Wait until it finishes. */ - async_synchronize_full_domain(&scsi_sd_probe_domain); - - } else if (scsi_is_host_device(dev)) { + if (scsi_is_host_device(dev)) { /* Wait until async scanning is finished */ scsi_complete_async_scans(); } diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h index 5f21547b2ad2..b1edf15704c0 100644 --- a/drivers/scsi/scsi_priv.h +++ b/drivers/scsi/scsi_priv.h @@ -174,9 +174,6 @@ 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 */ -extern struct async_domain scsi_sd_pm_domain; -extern struct async_domain scsi_sd_probe_domain; - /* scsi_dh.c */ #ifdef CONFIG_SCSI_DH void scsi_dh_add_device(struct scsi_device *sdev); diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index 251db30d0882..5fd4eb7be907 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -567,6 +567,7 @@ static struct scsi_driver sd_template = { .name = "sd", .owner = THIS_MODULE, .probe = sd_probe, + .probe_type = PROBE_PREFER_ASYNCHRONOUS, .remove = sd_remove, .shutdown = sd_shutdown, .pm = &sd_pm_ops, @@ -3286,12 +3287,8 @@ static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) return 0; } -/* - * The asynchronous part of sd_probe - */ -static void sd_probe_async(void *data, async_cookie_t cookie) +static void sd_probe_part2(struct scsi_disk *sdkp) { - struct scsi_disk *sdkp = data; struct scsi_device *sdp; struct gendisk *gd; u32 index; @@ -3345,7 +3342,6 @@ static void sd_probe_async(void *data, async_cookie_t cookie) sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", sdp->removable ? "removable " : ""); scsi_autopm_put_device(sdp); - put_device(&sdkp->dev); } /** @@ -3437,8 +3433,7 @@ static int sd_probe(struct device *dev) get_device(dev); dev_set_drvdata(dev, sdkp); - get_device(&sdkp->dev); /* prevent release before async_schedule */ - async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain); + sd_probe_part2(sdkp); return 0; @@ -3473,8 +3468,6 @@ 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); device_del(&sdkp->dev); del_gendisk(sdkp->disk); sd_shutdown(dev);