scsi: core: Add sysfs attributes for VPD pages 0h and 89h

Add sysfs attributes for the ATA information page and Supported VPD Pages
page.

Link: https://lore.kernel.org/r/20190926162216.56591-1-ryanattard@ryanattard.info
Signed-off-by: Ryan Attard <ryanattard@ryanattard.info>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/scsi.c

@@ -465,10 +465,14 @@ void scsi_attach_vpd(struct scsi_device *sdev)
 		return;
 
 	for (i = 4; i < vpd_buf->len; i++) {
+		if (vpd_buf->data[i] == 0x0)
+			scsi_update_vpd_page(sdev, 0x0, &sdev->vpd_pg0);
 		if (vpd_buf->data[i] == 0x80)
 			scsi_update_vpd_page(sdev, 0x80, &sdev->vpd_pg80);
 		if (vpd_buf->data[i] == 0x83)
 			scsi_update_vpd_page(sdev, 0x83, &sdev->vpd_pg83);
+		if (vpd_buf->data[i] == 0x89)
+			scsi_update_vpd_page(sdev, 0x89, &sdev->vpd_pg89);
 	}
 	kfree(vpd_buf);
 }

drivers/scsi/scsi_sysfs.c

@@ -437,6 +437,7 @@ static void scsi_device_dev_release_usercontext(struct work_struct *work)
 	struct device *parent;
 	struct list_head *this, *tmp;
 	struct scsi_vpd *vpd_pg80 = NULL, *vpd_pg83 = NULL;
+	struct scsi_vpd *vpd_pg0 = NULL, *vpd_pg89 = NULL;
 	unsigned long flags;
 
 	sdev = container_of(work, struct scsi_device, ew.work);
@@ -466,16 +467,24 @@ static void scsi_device_dev_release_usercontext(struct work_struct *work)
 	sdev->request_queue = NULL;
 
 	mutex_lock(&sdev->inquiry_mutex);
+	rcu_swap_protected(sdev->vpd_pg0, vpd_pg0,
+			   lockdep_is_held(&sdev->inquiry_mutex));
 	rcu_swap_protected(sdev->vpd_pg80, vpd_pg80,
 			   lockdep_is_held(&sdev->inquiry_mutex));
 	rcu_swap_protected(sdev->vpd_pg83, vpd_pg83,
 			   lockdep_is_held(&sdev->inquiry_mutex));
+	rcu_swap_protected(sdev->vpd_pg89, vpd_pg89,
+			   lockdep_is_held(&sdev->inquiry_mutex));
 	mutex_unlock(&sdev->inquiry_mutex);
 
+	if (vpd_pg0)
+		kfree_rcu(vpd_pg0, rcu);
 	if (vpd_pg83)
 		kfree_rcu(vpd_pg83, rcu);
 	if (vpd_pg80)
 		kfree_rcu(vpd_pg80, rcu);
+	if (vpd_pg89)
+		kfree_rcu(vpd_pg89, rcu);
 	kfree(sdev->inquiry);
 	kfree(sdev);
 
@@ -859,6 +868,8 @@ 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(pg0);
 
 static ssize_t show_inquiry(struct file *filep, struct kobject *kobj,
 			    struct bin_attribute *bin_attr,
@@ -1191,12 +1202,18 @@ static umode_t scsi_sdev_bin_attr_is_visible(struct kobject *kobj,
 	struct scsi_device *sdev = to_scsi_device(dev);
 
 
+	if (attr == &dev_attr_vpd_pg0 && !sdev->vpd_pg0)
+		return 0;
+
 	if (attr == &dev_attr_vpd_pg80 && !sdev->vpd_pg80)
 		return 0;
 
 	if (attr == &dev_attr_vpd_pg83 && !sdev->vpd_pg83)
 		return 0;
 
+	if (attr == &dev_attr_vpd_pg89 && !sdev->vpd_pg89)
+		return 0;
+
 	return S_IRUGO;
 }
 
@@ -1239,8 +1256,10 @@ static struct attribute *scsi_sdev_attrs[] = {
 };
 
 static struct bin_attribute *scsi_sdev_bin_attrs[] = {
+	&dev_attr_vpd_pg0,
 	&dev_attr_vpd_pg83,
 	&dev_attr_vpd_pg80,
+	&dev_attr_vpd_pg89,
 	&dev_attr_inquiry,
 	NULL
 };

include/scsi/scsi_device.h

@@ -140,8 +140,10 @@ struct scsi_device {
 	const char * rev;		/* ... "nullnullnullnull" before scan */
 
 #define SCSI_VPD_PG_LEN                255
+	struct scsi_vpd __rcu *vpd_pg0;
 	struct scsi_vpd __rcu *vpd_pg83;
 	struct scsi_vpd __rcu *vpd_pg80;
+	struct scsi_vpd __rcu *vpd_pg89;
 	unsigned char current_tag;	/* current tag */
 	struct scsi_target      *sdev_target;   /* used only for single_lun */