scsi: core: Cache VPD pages b0, b1, b2

The SCSI disk driver consults VPD pages b0 (Block Limits), b1 (Block Device
Characteristics), and b2 (Logical Block Provisioning). Instead of having
sd.c request these pages every revalidate cycle, cache them along with the
other commonly used VPDs.

Link: https://lore.kernel.org/r/20220302053559.32147-6-martin.petersen@oracle.com
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

3 files changed, 38 insertions, 0 deletions

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 3db2a928faec..c59eac7a32f2 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -483,6 +483,12 @@ void scsi_attach_vpd(struct scsi_device *sdev)
 			scsi_update_vpd_page(sdev, 0x83, &sdev->vpd_pg83);
 		if (vpd_buf->data[i] == 0x89)
 			scsi_update_vpd_page(sdev, 0x89, &sdev->vpd_pg89);
+		if (vpd_buf->data[i] == 0xb0)
+			scsi_update_vpd_page(sdev, 0xb0, &sdev->vpd_pgb0);
+		if (vpd_buf->data[i] == 0xb1)
+			scsi_update_vpd_page(sdev, 0xb1, &sdev->vpd_pgb1);
+		if (vpd_buf->data[i] == 0xb2)
+			scsi_update_vpd_page(sdev, 0xb2, &sdev->vpd_pgb2);
 	}
 	kfree(vpd_buf);
 }
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index dc6872e352bd..546a9e3cfbec 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -448,6 +448,7 @@ static void scsi_device_dev_release_usercontext(struct work_struct *work)
 	struct list_head *this, *tmp;
 	struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
 	struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL;
+	struct scsi_vpd *vpd_pgb0 = NULL, *vpd_pgb1 = NULL, *vpd_pgb2 = NULL;
 	unsigned long flags;
 	struct module *mod;
 
@@ -490,6 +491,12 @@ static void scsi_device_dev_release_usercontext(struct work_struct *work)
 				       lockdep_is_held(&sdev->inquiry_mutex));
 	vpd_pg89 = rcu_replace_pointer(sdev->vpd_pg89, vpd_pg89,
 				       lockdep_is_held(&sdev->inquiry_mutex));
+	vpd_pgb0 = rcu_replace_pointer(sdev->vpd_pgb0, vpd_pgb0,
+				       lockdep_is_held(&sdev->inquiry_mutex));
+	vpd_pgb1 = rcu_replace_pointer(sdev->vpd_pgb1, vpd_pgb1,
+				       lockdep_is_held(&sdev->inquiry_mutex));
+	vpd_pgb2 = rcu_replace_pointer(sdev->vpd_pgb2, vpd_pgb2,
+				       lockdep_is_held(&sdev->inquiry_mutex));
 	mutex_unlock(&sdev->inquiry_mutex);
 
 	if (vpd_pg0)
@@ -500,6 +507,12 @@ static void scsi_device_dev_release_usercontext(struct work_struct *work)
 		kfree_rcu(vpd_pg80, rcu);
 	if (vpd_pg89)
 		kfree_rcu(vpd_pg89, rcu);
+	if (vpd_pgb0)
+		kfree_rcu(vpd_pgb0, rcu);
+	if (vpd_pgb1)
+		kfree_rcu(vpd_pgb1, rcu);
+	if (vpd_pgb2)
+		kfree_rcu(vpd_pgb2, rcu);
 	kfree(sdev->inquiry);
 	kfree(sdev);
 
@@ -913,6 +926,9 @@ static struct bin_attribute dev_attr_vpd_##_page = {		\
 sdev_vpd_pg_attr(pg83);
 sdev_vpd_pg_attr(pg80);
 sdev_vpd_pg_attr(pg89);
+sdev_vpd_pg_attr(pgb0);
+sdev_vpd_pg_attr(pgb1);
+sdev_vpd_pg_attr(pgb2);
 sdev_vpd_pg_attr(pg0);
 
 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
@@ -1250,6 +1266,15 @@ static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
 	if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
 		return 0;
 
+	if (attr == &dev_attr_vpd_pgb0 && !sdev->vpd_pgb0)
+		return 0;
+
+	if (attr == &dev_attr_vpd_pgb1 && !sdev->vpd_pgb1)
+		return 0;
+
+	if (attr == &dev_attr_vpd_pgb2 && !sdev->vpd_pgb2)
+		return 0;
+
 	return S_IRUGO;
 }
 
@@ -1296,6 +1321,9 @@ static struct bin_attribute *scsi_sdev_bin_attrs[] = {
 	&dev_attr_vpd_pg83,
 	&dev_attr_vpd_pg80,
 	&dev_attr_vpd_pg89,
+	&dev_attr_vpd_pgb0,
+	&dev_attr_vpd_pgb1,
+	&dev_attr_vpd_pgb2,
 	&dev_attr_inquiry,
 	NULL
 };
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index c37cc5b3ebeb..7cf5f3b7589f 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -149,6 +149,10 @@ struct scsi_device {
 	struct scsi_vpd __rcu *vpd_pg83;
 	struct scsi_vpd __rcu *vpd_pg80;
 	struct scsi_vpd __rcu *vpd_pg89;
+	struct scsi_vpd __rcu *vpd_pgb0;
+	struct scsi_vpd __rcu *vpd_pgb1;
+	struct scsi_vpd __rcu *vpd_pgb2;
+
 	struct scsi_target      *sdev_target;
 
 	blist_flags_t		sdev_bflags; /* black/white flags as also found in