| Message ID | 1597850436-116171-14-git-send-email-john.garry@huawei.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | blk-mq/scsi: Provide hostwide shared tags for SCSI HBAs | expand |
On 19/08/2020 16:20, John Garry wrote: > So that we don't use a value of 0 for when Scsi_Host.nr_hw_queues is unset, > use the tag_set->nr_hw_queues (which holds 1 for this case). > > Signed-off-by: John Garry <john.garry@huawei.com> Note that there has been no review on this patch yet. It's not strictly necessary, but I see it as useful. The same info can be derived indirectly from block debugfs, but that's not always available (debugfs, that is). Thanks, john > --- > drivers/scsi/scsi_sysfs.c | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c > index 163dbcb741c1..d6e344fa33ad 100644 > --- a/drivers/scsi/scsi_sysfs.c > +++ b/drivers/scsi/scsi_sysfs.c > @@ -393,6 +393,16 @@ show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf) > } > static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL); > > +static ssize_t > +show_nr_hw_queues(struct device *dev, struct device_attribute *attr, char *buf) > +{ > + struct Scsi_Host *shost = class_to_shost(dev); > + struct blk_mq_tag_set *tag_set = &shost->tag_set; > + > + return snprintf(buf, 20, "%d\n", tag_set->nr_hw_queues); > +} > +static DEVICE_ATTR(nr_hw_queues, S_IRUGO, show_nr_hw_queues, NULL); > + > static struct attribute *scsi_sysfs_shost_attrs[] = { > &dev_attr_use_blk_mq.attr, > &dev_attr_unique_id.attr, > @@ -411,6 +421,7 @@ static struct attribute *scsi_sysfs_shost_attrs[] = { > &dev_attr_prot_guard_type.attr, > &dev_attr_host_reset.attr, > &dev_attr_eh_deadline.attr, > + &dev_attr_nr_hw_queues.attr, > NULL > }; > >
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c index 163dbcb741c1..d6e344fa33ad 100644 --- a/drivers/scsi/scsi_sysfs.c +++ b/drivers/scsi/scsi_sysfs.c @@ -393,6 +393,16 @@ show_use_blk_mq(struct device *dev, struct device_attribute *attr, char *buf) } static DEVICE_ATTR(use_blk_mq, S_IRUGO, show_use_blk_mq, NULL); +static ssize_t +show_nr_hw_queues(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct Scsi_Host *shost = class_to_shost(dev); + struct blk_mq_tag_set *tag_set = &shost->tag_set; + + return snprintf(buf, 20, "%d\n", tag_set->nr_hw_queues); +} +static DEVICE_ATTR(nr_hw_queues, S_IRUGO, show_nr_hw_queues, NULL); + static struct attribute *scsi_sysfs_shost_attrs[] = { &dev_attr_use_blk_mq.attr, &dev_attr_unique_id.attr, @@ -411,6 +421,7 @@ static struct attribute *scsi_sysfs_shost_attrs[] = { &dev_attr_prot_guard_type.attr, &dev_attr_host_reset.attr, &dev_attr_eh_deadline.attr, + &dev_attr_nr_hw_queues.attr, NULL };
So that we don't use a value of 0 for when Scsi_Host.nr_hw_queues is unset, use the tag_set->nr_hw_queues (which holds 1 for this case). Signed-off-by: John Garry <john.garry@huawei.com> --- drivers/scsi/scsi_sysfs.c | 11 +++++++++++ 1 file changed, 11 insertions(+)