As explained during the 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 reduces the time needed for loading the scsi_debug kernel
module with parameters delay=0 and max_luns=256 from 0.7s to 0.1s. In
other words, this specific test runs about seven times faster.
See also commit 3c31b52f96f7 ("scsi: async sd resume").
Cc: Lee Duncan <ldun...@suse.com>
Cc: Hannes Reinecke <h...@suse.com>
Cc: Luis Chamberlain <mcg...@kernel.org>
Cc: Johannes Thumshirn <jthumsh...@suse.de>
Cc: Christoph Hellwig <h...@lst.de>
Cc: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: Dan Williams <dan.j.willi...@intel.com>
Signed-off-by: Bart Van Assche <bvanass...@acm.org>
---
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 fc1356d101b0..1205369ad44f 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
@@ -839,7 +826,6 @@ 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 b44c1bb687a2..f229208bfef3 100644
--- a/drivers/scsi/scsi_pm.c
+++ b/drivers/scsi/scsi_pm.c
@@ -54,9 +54,6 @@ 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);
@@ -149,18 +146,7 @@ static int scsi_bus_resume_common(struct device *dev,
if (scsi_is_sdev_device(dev) && pm_runtime_suspended(dev))
blk_set_runtime_active(to_scsi_device(dev)->request_queue);
- 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);
@@ -170,11 +156,7 @@ 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 99f1db5e467e..b9fa363b4bbb 100644
--- a/drivers/scsi/scsi_priv.h
+++ b/drivers/scsi/scsi_priv.h
@@ -175,9 +175,6 @@ 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 b79b366a94f7..52eee36d13fb 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -559,6 +559,7 @@ 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,
@@ -3227,12 +3228,8 @@ 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;
@@ -3286,7 +3283,6 @@ 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);
}
/**
@@ -3378,8 +3374,7 @@ 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;
@@ -3414,8 +3409,6 @@ 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);
--
2.19.1.568.g152ad8e336-goog
