Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

Pull virtio/vhost updates from Michael Tsirkin:
"Features, fixes, cleanups:

   - discard in virtio blk

   - misc fixes and cleanups"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  vhost: correct the related warning message
  vhost: split structs into a separate header file
  virtio: remove deprecated VIRTIO_PCI_CONFIG()
  vhost/vsock: switch to a mutex for vhost_vsock_hash
  virtio_blk: add discard and write zeroes support

4 files changed, 95 insertions, 14 deletions

diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
index 912c4265e592..b16a887bbd02 100644
--- a/drivers/block/virtio_blk.c
+++ b/drivers/block/virtio_blk.c
@@ -18,6 +18,7 @@
 
 #define PART_BITS 4
 #define VQ_NAME_LEN 16
+#define MAX_DISCARD_SEGMENTS 256u
 
 static int major;
 static DEFINE_IDA(vd_index_ida);
@@ -172,10 +173,48 @@ static int virtblk_add_req(struct virtqueue *vq, struct virtblk_req *vbr,
 	return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC);
 }
 
+static int virtblk_setup_discard_write_zeroes(struct request *req, bool unmap)
+{
+	unsigned short segments = blk_rq_nr_discard_segments(req);
+	unsigned short n = 0;
+	struct virtio_blk_discard_write_zeroes *range;
+	struct bio *bio;
+	u32 flags = 0;
+
+	if (unmap)
+		flags |= VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP;
+
+	range = kmalloc_array(segments, sizeof(*range), GFP_ATOMIC);
+	if (!range)
+		return -ENOMEM;
+
+	__rq_for_each_bio(bio, req) {
+		u64 sector = bio->bi_iter.bi_sector;
+		u32 num_sectors = bio->bi_iter.bi_size >> SECTOR_SHIFT;
+
+		range[n].flags = cpu_to_le32(flags);
+		range[n].num_sectors = cpu_to_le32(num_sectors);
+		range[n].sector = cpu_to_le64(sector);
+		n++;
+	}
+
+	req->special_vec.bv_page = virt_to_page(range);
+	req->special_vec.bv_offset = offset_in_page(range);
+	req->special_vec.bv_len = sizeof(*range) * segments;
+	req->rq_flags |= RQF_SPECIAL_PAYLOAD;
+
+	return 0;
+}
+
 static inline void virtblk_request_done(struct request *req)
 {
 	struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
 
+	if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
+		kfree(page_address(req->special_vec.bv_page) +
+		      req->special_vec.bv_offset);
+	}
+
 	switch (req_op(req)) {
 	case REQ_OP_SCSI_IN:
 	case REQ_OP_SCSI_OUT:
@@ -239,6 +278,7 @@ static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx,
 	int qid = hctx->queue_num;
 	int err;
 	bool notify = false;
+	bool unmap = false;
 	u32 type;
 
 	BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems);
@@ -251,6 +291,13 @@ static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx,
 	case REQ_OP_FLUSH:
 		type = VIRTIO_BLK_T_FLUSH;
 		break;
+	case REQ_OP_DISCARD:
+		type = VIRTIO_BLK_T_DISCARD;
+		break;
+	case REQ_OP_WRITE_ZEROES:
+		type = VIRTIO_BLK_T_WRITE_ZEROES;
+		unmap = !(req->cmd_flags & REQ_NOUNMAP);
+		break;
 	case REQ_OP_SCSI_IN:
 	case REQ_OP_SCSI_OUT:
 		type = VIRTIO_BLK_T_SCSI_CMD;
@@ -270,6 +317,12 @@ static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx,
 
 	blk_mq_start_request(req);
 
+	if (type == VIRTIO_BLK_T_DISCARD || type == VIRTIO_BLK_T_WRITE_ZEROES) {
+		err = virtblk_setup_discard_write_zeroes(req, unmap);
+		if (err)
+			return BLK_STS_RESOURCE;
+	}
+
 	num = blk_rq_map_sg(hctx->queue, req, vbr->sg);
 	if (num) {
 		if (rq_data_dir(req) == WRITE)
@@ -817,6 +870,32 @@ static int virtblk_probe(struct virtio_device *vdev)
 	if (!err && opt_io_size)
 		blk_queue_io_opt(q, blk_size * opt_io_size);
 
+	if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD)) {
+		q->limits.discard_granularity = blk_size;
+
+		virtio_cread(vdev, struct virtio_blk_config,
+			     discard_sector_alignment, &v);
+		q->limits.discard_alignment = v ? v << SECTOR_SHIFT : 0;
+
+		virtio_cread(vdev, struct virtio_blk_config,
+			     max_discard_sectors, &v);
+		blk_queue_max_discard_sectors(q, v ? v : UINT_MAX);
+
+		virtio_cread(vdev, struct virtio_blk_config, max_discard_seg,
+			     &v);
+		blk_queue_max_discard_segments(q,
+					       min_not_zero(v,
+							    MAX_DISCARD_SEGMENTS));
+
+		blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
+	}
+
+	if (virtio_has_feature(vdev, VIRTIO_BLK_F_WRITE_ZEROES)) {
+		virtio_cread(vdev, struct virtio_blk_config,
+			     max_write_zeroes_sectors, &v);
+		blk_queue_max_write_zeroes_sectors(q, v ? v : UINT_MAX);
+	}
+
 	virtblk_update_capacity(vblk, false);
 	virtio_device_ready(vdev);
 
@@ -910,14 +989,14 @@ static unsigned int features_legacy[] = {
 	VIRTIO_BLK_F_SCSI,
 #endif
 	VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
-	VIRTIO_BLK_F_MQ,
+	VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES,
 }
 ;
 static unsigned int features[] = {
 	VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
 	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_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES,
 };
 
 static struct virtio_driver virtio_blk = {
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index a08472ae5b1b..8e10ab436d1f 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -884,7 +884,7 @@ vhost_scsi_get_req(struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc,
 
 	if (unlikely(!copy_from_iter_full(vc->req, vc->req_size,
 					  &vc->out_iter))) {
-		vq_err(vq, "Faulted on copy_from_iter\n");
+		vq_err(vq, "Faulted on copy_from_iter_full\n");
 	} else if (unlikely(*vc->lunp != 1)) {
 		/* virtio-scsi spec requires byte 0 of the lun to be 1 */
 		vq_err(vq, "Illegal virtio-scsi lun: %u\n", *vc->lunp);
@@ -1436,7 +1436,7 @@ vhost_scsi_set_endpoint(struct vhost_scsi *vs,
 			se_tpg = &tpg->se_tpg;
 			ret = target_depend_item(&se_tpg->tpg_group.cg_item);
 			if (ret) {
-				pr_warn("configfs_depend_item() failed: %d\n", ret);
+				pr_warn("target_depend_item() failed: %d\n", ret);
 				kfree(vs_tpg);
 				mutex_unlock(&tpg->tv_tpg_mutex);
 				goto out;
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
index 98ed5be132c6..bc42d38ae031 100644
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -27,14 +27,14 @@ enum {
 };
 
 /* Used to track all the vhost_vsock instances on the system. */
-static DEFINE_SPINLOCK(vhost_vsock_lock);
+static DEFINE_MUTEX(vhost_vsock_mutex);
 static DEFINE_READ_MOSTLY_HASHTABLE(vhost_vsock_hash, 8);
 
 struct vhost_vsock {
 	struct vhost_dev dev;
 	struct vhost_virtqueue vqs[2];
 
-	/* Link to global vhost_vsock_hash, writes use vhost_vsock_lock */
+	/* Link to global vhost_vsock_hash, writes use vhost_vsock_mutex */
 	struct hlist_node hash;
 
 	struct vhost_work send_pkt_work;
@@ -51,7 +51,7 @@ static u32 vhost_transport_get_local_cid(void)
 	return VHOST_VSOCK_DEFAULT_HOST_CID;
 }
 
-/* Callers that dereference the return value must hold vhost_vsock_lock or the
+/* Callers that dereference the return value must hold vhost_vsock_mutex or the
  * RCU read lock.
  */
 static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
@@ -584,10 +584,10 @@ static int vhost_vsock_dev_release(struct inode *inode, struct file *file)
 {
 	struct vhost_vsock *vsock = file->private_data;
 
-	spin_lock_bh(&vhost_vsock_lock);
+	mutex_lock(&vhost_vsock_mutex);
 	if (vsock->guest_cid)
 		hash_del_rcu(&vsock->hash);
-	spin_unlock_bh(&vhost_vsock_lock);
+	mutex_unlock(&vhost_vsock_mutex);
 
 	/* Wait for other CPUs to finish using vsock */
 	synchronize_rcu();
@@ -631,10 +631,10 @@ static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid)
 		return -EINVAL;
 
 	/* Refuse if CID is already in use */
-	spin_lock_bh(&vhost_vsock_lock);
+	mutex_lock(&vhost_vsock_mutex);
 	other = vhost_vsock_get(guest_cid);
 	if (other && other != vsock) {
-		spin_unlock_bh(&vhost_vsock_lock);
+		mutex_unlock(&vhost_vsock_mutex);
 		return -EADDRINUSE;
 	}
 
@@ -643,7 +643,7 @@ static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid)
 
 	vsock->guest_cid = guest_cid;
 	hash_add_rcu(vhost_vsock_hash, &vsock->hash, guest_cid);
-	spin_unlock_bh(&vhost_vsock_lock);
+	mutex_unlock(&vhost_vsock_mutex);
 
 	return 0;
 }
diff --git a/drivers/virtio/virtio_pci_legacy.c b/drivers/virtio/virtio_pci_legacy.c
index de062fb201bc..eff9ddc7c4ab 100644
--- a/drivers/virtio/virtio_pci_legacy.c
+++ b/drivers/virtio/virtio_pci_legacy.c
@@ -52,7 +52,8 @@ static void vp_get(struct virtio_device *vdev, unsigned offset,
 {
 	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
 	void __iomem *ioaddr = vp_dev->ioaddr +
-				VIRTIO_PCI_CONFIG(vp_dev) + offset;
+			VIRTIO_PCI_CONFIG_OFF(vp_dev->msix_enabled) +
+			offset;
 	u8 *ptr = buf;
 	int i;
 
@@ -67,7 +68,8 @@ static void vp_set(struct virtio_device *vdev, unsigned offset,
 {
 	struct virtio_pci_device *vp_dev = to_vp_device(vdev);
 	void __iomem *ioaddr = vp_dev->ioaddr +
-				VIRTIO_PCI_CONFIG(vp_dev) + offset;
+			VIRTIO_PCI_CONFIG_OFF(vp_dev->msix_enabled) +
+			offset;
 	const u8 *ptr = buf;
 	int i;