[PATCH 09/10] scsi: add scsi_device_busy() to read sdev->device_busy

Ming Lei
2020-02-11T12:13:09Z

Add scsi_device_busy() for drivers, so that we can prepare for tracking
device queue depth via sbitmap_queue.

Cc: Omar Sandoval <osandov@fb.com>
Cc: Sathya Prakash <sathya.prakash@broadcom.com>
Cc: Chaitra P B <chaitra.basappa@broadcom.com>
Cc: Suganath Prabu Subramani <suganath-prabu.subramani@broadcom.com>
Cc: Kashyap Desai <kashyap.desai@broadcom.com>
Cc: Sumit Saxena <sumit.saxena@broadcom.com>
Cc: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Cc: Ewan D. Milne <emilne@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
---
drivers/scsi/mpt3sas/mpt3sas_scsih.c | 2 +-
drivers/scsi/scsi_lib.c | 4 ++--
drivers/scsi/scsi_sysfs.c | 2 +-
drivers/scsi/sg.c | 2 +-
include/scsi/scsi_device.h | 5 +++++
5 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
index c597d544eb39..6685ec041c38 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c
@@ -3060,7 +3060,7 @@ scsih_dev_reset(struct scsi_cmnd *scmd)
MPI2_SCSITASKMGMT_TASKTYPE_LOGICAL_UNIT_RESET, 0, 0,
tr_timeout, tr_method);
/* Check for busy commands after reset */
- if (r == SUCCESS && atomic_read(&scmd->device->device_busy))
+ if (r == SUCCESS && scsi_device_busy(scmd->device))
r = FAILED;
out:
sdev_printk(KERN_INFO, scmd->device, "device reset: %s scmd(0x%p)\n",
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index c8eb555b3ce8..a3474b418602 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -410,7 +410,7 @@ static void scsi_single_lun_run(struct scsi_device *current_sdev)

static inline bool scsi_device_is_busy(struct scsi_device *sdev)
{
- if (atomic_read(&sdev->device_busy) >= sdev->queue_depth)
+ if (scsi_device_busy(sdev) >= sdev->queue_depth)
return true;
if (atomic_read(&sdev->device_blocked) > 0)
return true;
@@ -1635,7 +1635,7 @@ static int scsi_mq_get_budget(struct blk_mq_hw_ctx *hctx)
if (scsi_dev_queue_ready(q, sdev))
return 0;

- if (atomic_read(&sdev->device_busy) == 0 && !scsi_device_blocked(sdev))
+ if (scsi_device_busy(sdev) == 0 && !scsi_device_blocked(sdev))
blk_mq_delay_run_hw_queue(hctx, SCSI_QUEUE_DELAY);
return -1;
}
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index 677b5c5403d2..d6cb5a0a03f2 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -659,7 +659,7 @@ sdev_show_device_busy(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct scsi_device *sdev = to_scsi_device(dev);
- return snprintf(buf, 20, "%d\n", atomic_read(&sdev->device_busy));
+ return snprintf(buf, 20, "%d\n", scsi_device_busy(sdev));
}
static DEVICE_ATTR(device_busy, S_IRUGO, sdev_show_device_busy, NULL);

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 4e6af592f018..943a18256881 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -2507,7 +2507,7 @@ static int sg_proc_seq_show_dev(struct seq_file *s, void *v)
scsidp->id, scsidp->lun, (int) scsidp->type,
1,
(int) scsidp->queue_depth,
- (int) atomic_read(&scsidp->device_busy),
+ (int) scsi_device_busy(scsidp),
(int) scsi_device_online(scsidp));
}
read_unlock_irqrestore(&sg_index_lock, iflags);
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index f8312a3e5b42..09caf6f2f528 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -584,6 +584,11 @@ static inline int scsi_device_supports_vpd(struct scsi_device *sdev)
return 0;
}

+static inline int scsi_device_busy(struct scsi_device *sdev)
+{
+ return atomic_read(&sdev->device_busy);
+}
+
#define MODULE_ALIAS_SCSI_DEVICE(type) \
MODULE_ALIAS("scsi:t-" __stringify(type) "*")
#define SCSI_DEVICE_MODALIAS_FMT "scsi:t-0x%02x"
--
2.20.1