[PATCH v2] virtio_blk: Add support for lifetime feature
From: Enrico Granata
Date: Fri Apr 16 2021 - 15:47:23 EST
The VirtIO TC has adopted a new feature in virtio-blk enabling
discovery of lifetime information.
This commit adds support for the VIRTIO_BLK_T_LIFETIME command
to the virtio_blk driver, and adds two new attributes to the
sysfs entry for virtio_blk:
* pre_eol_info
* life_time
which are defined in the same manner as the files of the same name
for the eMMC driver, in line with the VirtIO specification.
Signed-off-by: Enrico Granata <egranata@xxxxxxxxxx>
---
Changes in v2:
- Removed redudnant buffer size checks
- Renamed variables for consistency
- Cleaned up endianness
drivers/block/virtio_blk.c | 75 +++++++++++++++++++++++++++++++--
include/uapi/linux/virtio_blk.h | 11 +++++
2 files changed, 83 insertions(+), 3 deletions(-)
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index b9fa3ef5b57c..31969f680a9f 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -246,14 +246,15 @@ static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx,
unmap = !(req->cmd_flags & REQ_NOUNMAP);
break;
case REQ_OP_DRV_IN:
- type = VIRTIO_BLK_T_GET_ID;
- break;
+ break; /* type already set for custom requests */
default:
WARN_ON_ONCE(1);
return BLK_STS_IOERR;
}
- vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, type);
+ if (req_op(req) != REQ_OP_DRV_IN)
+ vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, type);
+
vbr->out_hdr.sector = type ?
0 : cpu_to_virtio64(vblk->vdev, blk_rq_pos(req));
vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(req));
@@ -310,11 +311,14 @@ static int virtblk_get_id(struct gendisk *disk, char *id_str)
struct virtio_blk *vblk = disk->private_data;
struct request_queue *q = vblk->disk->queue;
struct request *req;
+ struct virtblk_req *vbr;
int err;
req = blk_get_request(q, REQ_OP_DRV_IN, 0);
if (IS_ERR(req))
return PTR_ERR(req);
+ vbr = blk_mq_rq_to_pdu(req);
+ vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_GET_ID);
err = blk_rq_map_kern(q, req, id_str, VIRTIO_BLK_ID_BYTES, GFP_KERNEL);
if (err)
@@ -327,6 +331,34 @@ static int virtblk_get_id(struct gendisk *disk, char *id_str)
return err;
}
+static int virtblk_get_lifetime(struct gendisk *disk, struct virtio_blk_lifetime *lifetime)
+{
+ struct virtio_blk *vblk = disk->private_data;
+ struct request_queue *q = vblk->disk->queue;
+ struct request *req;
+ struct virtblk_req *vbr;
+ int err;
+
+ if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_LIFETIME))
+ return -EOPNOTSUPP;
+
+ req = blk_get_request(q, REQ_OP_DRV_IN, 0);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+ vbr = blk_mq_rq_to_pdu(req);
+ vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_GET_LIFETIME);
+
+ err = blk_rq_map_kern(q, req, lifetime, sizeof(*lifetime), GFP_KERNEL);
+ if (err)
+ goto out;
+
+ blk_execute_rq(vblk->disk, req, false);
+ err = blk_status_to_errno(virtblk_result(blk_mq_rq_to_pdu(req)));
+out:
+ blk_put_request(req);
+ return err;
+}
+
static void virtblk_get(struct virtio_blk *vblk)
{
refcount_inc(&vblk->refs);
@@ -435,6 +467,40 @@ static ssize_t serial_show(struct device *dev,
static DEVICE_ATTR_RO(serial);
+static ssize_t pre_eol_info_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gendisk *disk = dev_to_disk(dev);
+ struct virtio_blk_lifetime lft;
+ int err;
+
+ err = virtblk_get_lifetime(disk, &lft);
+ if (err)
+ return 0;
+
+ return sprintf(buf, "0x%02x\n", le16_to_cpu(lft.pre_eol_info));
+}
+
+static DEVICE_ATTR_RO(pre_eol_info);
+
+static ssize_t life_time_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct gendisk *disk = dev_to_disk(dev);
+ struct virtio_blk_lifetime lft;
+ int err;
+
+ err = virtblk_get_lifetime(disk, &lft);
+ if (err)
+ return 0;
+
+ return sprintf(buf, "0x%02x 0x%02x\n",
+ le16_to_cpu(lft.device_life_time_est_typ_a),
+ le16_to_cpu(lft.device_life_time_est_typ_b));
+}
+
+static DEVICE_ATTR_RO(life_time);
+
/* The queue's logical block size must be set before calling this */
static void virtblk_update_capacity(struct virtio_blk *vblk, bool resize)
{
@@ -638,6 +704,8 @@ static DEVICE_ATTR_RW(cache_type);
static struct attribute *virtblk_attrs[] = {
&dev_attr_serial.attr,
+ &dev_attr_pre_eol_info.attr,
+ &dev_attr_life_time.attr,
&dev_attr_cache_type.attr,
NULL,
};
@@ -984,6 +1052,7 @@ static unsigned int features[] = {
VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES,
+ VIRTIO_BLK_F_LIFETIME,
};
static struct virtio_driver virtio_blk = {
diff --git a/include/uapi/linux/virtio_blk.h b/include/uapi/linux/virtio_blk.h
index d888f013d9ff..bbd3978b9d08 100644
--- a/include/uapi/linux/virtio_blk.h
+++ b/include/uapi/linux/virtio_blk.h
@@ -40,6 +40,7 @@
#define VIRTIO_BLK_F_MQ 12 /* support more than one vq */
#define VIRTIO_BLK_F_DISCARD 13 /* DISCARD is supported */
#define VIRTIO_BLK_F_WRITE_ZEROES 14 /* WRITE ZEROES is supported */
+#define VIRTIO_BLK_F_LIFETIME 15 /* LIFETIME is supported */
/* Legacy feature bits */
#ifndef VIRTIO_BLK_NO_LEGACY
@@ -149,6 +150,9 @@ struct virtio_blk_config {
/* Get device ID command */
#define VIRTIO_BLK_T_GET_ID 8
+/* Get device lifetime command */
+#define VIRTIO_BLK_T_GET_LIFETIME 10
+
/* Discard command */
#define VIRTIO_BLK_T_DISCARD 11
@@ -196,6 +200,13 @@ struct virtio_scsi_inhdr {
};
#endif /* !VIRTIO_BLK_NO_LEGACY */
+/* Lifetime information for virtio_blk device */
+struct virtio_blk_lifetime {
+ __le16 pre_eol_info;
+ __le16 device_life_time_est_typ_a;
+ __le16 device_life_time_est_typ_b;
+};
+
/* And this is the final byte of the write scatter-gather list. */
#define VIRTIO_BLK_S_OK 0
#define VIRTIO_BLK_S_IOERR 1
--
2.31.1.368.gbe11c130af-goog