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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Linus Torvalds](/assets/img/avatar_default.png)
device feature provisioning in ifcvf, mlx5 new SolidNET driver support for zoned block device in virtio blk numa support in virtio pmem VIRTIO_F_RING_RESET support in vhost-net more debugfs entries in mlx5 resume support in vdpa completion batching in virtio blk cleanup of dma api use in vdpa now simulating more features in vdpa-sim documentation, features, fixes all over the place Signed-off-by: Michael S. Tsirkin <mst@redhat.com> -----BEGIN PGP SIGNATURE----- iQFDBAABCAAtFiEEXQn9CHHI+FuUyooNKB8NuNKNVGkFAmP0D98PHG1zdEByZWRo YXQuY29tAAoJECgfDbjSjVRpV6IH/iecRgLMWWjp3n31IFdu31f/J4HpF7dczVjK qtV98eJ1N2pkgeJkdCfmB5XszfvFBeAurrS7++FTHiJhrRfR3Z+2ml/Qtvh5DEyP qxz6wOw6VVsi/txdUxM1wsxLeEmmzkmFdAmPM+FXeIjhWj76GOgy/4A3eaj6TgzV W8ShsBve/UZ5qMOC3XbIscvdOrudHJ18tH90Tiz3NZfH1fAs5E4uWbU6Mrz9DJVr canGvf4kAI9z8qram5HSgzPIXRJEYiF4q/eiStdtiiME8gL1mHLRZDNP1I1LeCAb q6Q6RCRKi3Ek+LGdH6u+nR1Swu03N2b/g+vgKtv30kJo06oZVzw= =EasV -----END PGP SIGNATURE----- Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost Pull virtio updates from Michael Tsirkin: - device feature provisioning in ifcvf, mlx5 - new SolidNET driver - support for zoned block device in virtio blk - numa support in virtio pmem - VIRTIO_F_RING_RESET support in vhost-net - more debugfs entries in mlx5 - resume support in vdpa - completion batching in virtio blk - cleanup of dma api use in vdpa - now simulating more features in vdpa-sim - documentation, features, fixes all over the place * tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: (64 commits) vdpa/mlx5: support device features provisioning vdpa/mlx5: make MTU/STATUS presence conditional on feature bits vdpa: validate device feature provisioning against supported class vdpa: validate provisioned device features against specified attribute vdpa: conditionally read STATUS in config space vdpa: fix improper error message when adding vdpa dev vdpa/mlx5: Initialize CVQ iotlb spinlock vdpa/mlx5: Don't clear mr struct on destroy MR vdpa/mlx5: Directly assign memory key tools/virtio: enable to build with retpoline vringh: fix a typo in comments for vringh_kiov vhost-vdpa: print warning when vhost_vdpa_alloc_domain fails scsi: virtio_scsi: fix handling of kmalloc failure vdpa: Fix a couple of spelling mistakes in some messages vhost-net: support VIRTIO_F_RING_RESET vhost-scsi: convert sysfs snprintf and sprintf to sysfs_emit vdpa: mlx5: support per virtqueue dma device vdpa: set dma mask for vDPA device virtio-vdpa: support per vq dma device vdpa: introduce get_vq_dma_device() ...
1670 lines
42 KiB
C
1670 lines
42 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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//#define DEBUG
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/blkdev.h>
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#include <linux/hdreg.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/interrupt.h>
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#include <linux/virtio.h>
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#include <linux/virtio_blk.h>
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#include <linux/scatterlist.h>
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#include <linux/string_helpers.h>
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#include <linux/idr.h>
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#include <linux/blk-mq.h>
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#include <linux/blk-mq-virtio.h>
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#include <linux/numa.h>
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#include <linux/vmalloc.h>
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#include <uapi/linux/virtio_ring.h>
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#define PART_BITS 4
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#define VQ_NAME_LEN 16
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#define MAX_DISCARD_SEGMENTS 256u
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/* The maximum number of sg elements that fit into a virtqueue */
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#define VIRTIO_BLK_MAX_SG_ELEMS 32768
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#ifdef CONFIG_ARCH_NO_SG_CHAIN
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#define VIRTIO_BLK_INLINE_SG_CNT 0
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#else
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#define VIRTIO_BLK_INLINE_SG_CNT 2
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#endif
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static unsigned int num_request_queues;
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module_param(num_request_queues, uint, 0644);
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MODULE_PARM_DESC(num_request_queues,
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"Limit the number of request queues to use for blk device. "
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"0 for no limit. "
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"Values > nr_cpu_ids truncated to nr_cpu_ids.");
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static unsigned int poll_queues;
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module_param(poll_queues, uint, 0644);
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MODULE_PARM_DESC(poll_queues, "The number of dedicated virtqueues for polling I/O");
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static int major;
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static DEFINE_IDA(vd_index_ida);
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static struct workqueue_struct *virtblk_wq;
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struct virtio_blk_vq {
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struct virtqueue *vq;
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spinlock_t lock;
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char name[VQ_NAME_LEN];
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} ____cacheline_aligned_in_smp;
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struct virtio_blk {
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/*
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* This mutex must be held by anything that may run after
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* virtblk_remove() sets vblk->vdev to NULL.
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*
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* blk-mq, virtqueue processing, and sysfs attribute code paths are
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* shut down before vblk->vdev is set to NULL and therefore do not need
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* to hold this mutex.
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*/
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struct mutex vdev_mutex;
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struct virtio_device *vdev;
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/* The disk structure for the kernel. */
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struct gendisk *disk;
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/* Block layer tags. */
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struct blk_mq_tag_set tag_set;
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/* Process context for config space updates */
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struct work_struct config_work;
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/* Ida index - used to track minor number allocations. */
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int index;
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/* num of vqs */
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int num_vqs;
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int io_queues[HCTX_MAX_TYPES];
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struct virtio_blk_vq *vqs;
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/* For zoned device */
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unsigned int zone_sectors;
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};
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struct virtblk_req {
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/* Out header */
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struct virtio_blk_outhdr out_hdr;
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/* In header */
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union {
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u8 status;
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/*
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* The zone append command has an extended in header.
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* The status field in zone_append_in_hdr must have
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* the same offset in virtblk_req as the non-zoned
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* status field above.
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*/
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struct {
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u8 status;
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u8 reserved[7];
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__le64 append_sector;
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} zone_append_in_hdr;
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};
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size_t in_hdr_len;
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struct sg_table sg_table;
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struct scatterlist sg[];
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};
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static inline blk_status_t virtblk_result(u8 status)
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{
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switch (status) {
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case VIRTIO_BLK_S_OK:
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return BLK_STS_OK;
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case VIRTIO_BLK_S_UNSUPP:
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return BLK_STS_NOTSUPP;
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case VIRTIO_BLK_S_ZONE_OPEN_RESOURCE:
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return BLK_STS_ZONE_OPEN_RESOURCE;
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case VIRTIO_BLK_S_ZONE_ACTIVE_RESOURCE:
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return BLK_STS_ZONE_ACTIVE_RESOURCE;
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case VIRTIO_BLK_S_IOERR:
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case VIRTIO_BLK_S_ZONE_UNALIGNED_WP:
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default:
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return BLK_STS_IOERR;
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}
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}
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static inline struct virtio_blk_vq *get_virtio_blk_vq(struct blk_mq_hw_ctx *hctx)
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{
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struct virtio_blk *vblk = hctx->queue->queuedata;
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struct virtio_blk_vq *vq = &vblk->vqs[hctx->queue_num];
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return vq;
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}
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static int virtblk_add_req(struct virtqueue *vq, struct virtblk_req *vbr)
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{
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struct scatterlist out_hdr, in_hdr, *sgs[3];
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unsigned int num_out = 0, num_in = 0;
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sg_init_one(&out_hdr, &vbr->out_hdr, sizeof(vbr->out_hdr));
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sgs[num_out++] = &out_hdr;
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if (vbr->sg_table.nents) {
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if (vbr->out_hdr.type & cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT))
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sgs[num_out++] = vbr->sg_table.sgl;
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else
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sgs[num_out + num_in++] = vbr->sg_table.sgl;
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}
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sg_init_one(&in_hdr, &vbr->status, vbr->in_hdr_len);
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sgs[num_out + num_in++] = &in_hdr;
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return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC);
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}
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static int virtblk_setup_discard_write_zeroes_erase(struct request *req, bool unmap)
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{
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unsigned short segments = blk_rq_nr_discard_segments(req);
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unsigned short n = 0;
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struct virtio_blk_discard_write_zeroes *range;
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struct bio *bio;
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u32 flags = 0;
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if (unmap)
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flags |= VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP;
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range = kmalloc_array(segments, sizeof(*range), GFP_ATOMIC);
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if (!range)
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return -ENOMEM;
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/*
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* Single max discard segment means multi-range discard isn't
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* supported, and block layer only runs contiguity merge like
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* normal RW request. So we can't reply on bio for retrieving
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* each range info.
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*/
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if (queue_max_discard_segments(req->q) == 1) {
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range[0].flags = cpu_to_le32(flags);
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range[0].num_sectors = cpu_to_le32(blk_rq_sectors(req));
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range[0].sector = cpu_to_le64(blk_rq_pos(req));
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n = 1;
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} else {
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__rq_for_each_bio(bio, req) {
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u64 sector = bio->bi_iter.bi_sector;
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u32 num_sectors = bio->bi_iter.bi_size >> SECTOR_SHIFT;
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range[n].flags = cpu_to_le32(flags);
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range[n].num_sectors = cpu_to_le32(num_sectors);
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range[n].sector = cpu_to_le64(sector);
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n++;
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}
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}
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WARN_ON_ONCE(n != segments);
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bvec_set_virt(&req->special_vec, range, sizeof(*range) * segments);
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req->rq_flags |= RQF_SPECIAL_PAYLOAD;
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return 0;
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}
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static void virtblk_unmap_data(struct request *req, struct virtblk_req *vbr)
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{
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if (blk_rq_nr_phys_segments(req))
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sg_free_table_chained(&vbr->sg_table,
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VIRTIO_BLK_INLINE_SG_CNT);
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}
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static int virtblk_map_data(struct blk_mq_hw_ctx *hctx, struct request *req,
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struct virtblk_req *vbr)
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{
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int err;
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if (!blk_rq_nr_phys_segments(req))
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return 0;
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vbr->sg_table.sgl = vbr->sg;
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err = sg_alloc_table_chained(&vbr->sg_table,
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blk_rq_nr_phys_segments(req),
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vbr->sg_table.sgl,
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VIRTIO_BLK_INLINE_SG_CNT);
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if (unlikely(err))
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return -ENOMEM;
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return blk_rq_map_sg(hctx->queue, req, vbr->sg_table.sgl);
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}
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static void virtblk_cleanup_cmd(struct request *req)
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{
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if (req->rq_flags & RQF_SPECIAL_PAYLOAD)
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kfree(bvec_virt(&req->special_vec));
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}
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static blk_status_t virtblk_setup_cmd(struct virtio_device *vdev,
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struct request *req,
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struct virtblk_req *vbr)
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{
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size_t in_hdr_len = sizeof(vbr->status);
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bool unmap = false;
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u32 type;
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u64 sector = 0;
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/* Set fields for all request types */
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vbr->out_hdr.ioprio = cpu_to_virtio32(vdev, req_get_ioprio(req));
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switch (req_op(req)) {
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case REQ_OP_READ:
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type = VIRTIO_BLK_T_IN;
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sector = blk_rq_pos(req);
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break;
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case REQ_OP_WRITE:
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type = VIRTIO_BLK_T_OUT;
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sector = blk_rq_pos(req);
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break;
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case REQ_OP_FLUSH:
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type = VIRTIO_BLK_T_FLUSH;
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break;
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case REQ_OP_DISCARD:
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type = VIRTIO_BLK_T_DISCARD;
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break;
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case REQ_OP_WRITE_ZEROES:
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type = VIRTIO_BLK_T_WRITE_ZEROES;
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unmap = !(req->cmd_flags & REQ_NOUNMAP);
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break;
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case REQ_OP_SECURE_ERASE:
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type = VIRTIO_BLK_T_SECURE_ERASE;
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break;
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case REQ_OP_ZONE_OPEN:
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type = VIRTIO_BLK_T_ZONE_OPEN;
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sector = blk_rq_pos(req);
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break;
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case REQ_OP_ZONE_CLOSE:
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type = VIRTIO_BLK_T_ZONE_CLOSE;
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sector = blk_rq_pos(req);
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break;
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case REQ_OP_ZONE_FINISH:
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type = VIRTIO_BLK_T_ZONE_FINISH;
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sector = blk_rq_pos(req);
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break;
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case REQ_OP_ZONE_APPEND:
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type = VIRTIO_BLK_T_ZONE_APPEND;
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sector = blk_rq_pos(req);
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in_hdr_len = sizeof(vbr->zone_append_in_hdr);
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break;
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case REQ_OP_ZONE_RESET:
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type = VIRTIO_BLK_T_ZONE_RESET;
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sector = blk_rq_pos(req);
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break;
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case REQ_OP_ZONE_RESET_ALL:
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type = VIRTIO_BLK_T_ZONE_RESET_ALL;
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break;
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case REQ_OP_DRV_IN:
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/* Out header already filled in, nothing to do */
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return 0;
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default:
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WARN_ON_ONCE(1);
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return BLK_STS_IOERR;
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}
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/* Set fields for non-REQ_OP_DRV_IN request types */
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vbr->in_hdr_len = in_hdr_len;
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vbr->out_hdr.type = cpu_to_virtio32(vdev, type);
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vbr->out_hdr.sector = cpu_to_virtio64(vdev, sector);
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if (type == VIRTIO_BLK_T_DISCARD || type == VIRTIO_BLK_T_WRITE_ZEROES ||
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type == VIRTIO_BLK_T_SECURE_ERASE) {
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if (virtblk_setup_discard_write_zeroes_erase(req, unmap))
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return BLK_STS_RESOURCE;
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}
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return 0;
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}
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static inline void virtblk_request_done(struct request *req)
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{
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struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
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blk_status_t status = virtblk_result(vbr->status);
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virtblk_unmap_data(req, vbr);
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virtblk_cleanup_cmd(req);
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if (req_op(req) == REQ_OP_ZONE_APPEND)
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req->__sector = le64_to_cpu(vbr->zone_append_in_hdr.append_sector);
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blk_mq_end_request(req, status);
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}
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static void virtblk_complete_batch(struct io_comp_batch *iob)
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{
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struct request *req;
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rq_list_for_each(&iob->req_list, req) {
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virtblk_unmap_data(req, blk_mq_rq_to_pdu(req));
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virtblk_cleanup_cmd(req);
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}
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blk_mq_end_request_batch(iob);
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}
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static int virtblk_handle_req(struct virtio_blk_vq *vq,
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struct io_comp_batch *iob)
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{
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struct virtblk_req *vbr;
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int req_done = 0;
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unsigned int len;
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while ((vbr = virtqueue_get_buf(vq->vq, &len)) != NULL) {
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struct request *req = blk_mq_rq_from_pdu(vbr);
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if (likely(!blk_should_fake_timeout(req->q)) &&
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!blk_mq_complete_request_remote(req) &&
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!blk_mq_add_to_batch(req, iob, vbr->status,
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virtblk_complete_batch))
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virtblk_request_done(req);
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req_done++;
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}
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return req_done;
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}
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static void virtblk_done(struct virtqueue *vq)
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{
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struct virtio_blk *vblk = vq->vdev->priv;
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struct virtio_blk_vq *vblk_vq = &vblk->vqs[vq->index];
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int req_done = 0;
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unsigned long flags;
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DEFINE_IO_COMP_BATCH(iob);
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spin_lock_irqsave(&vblk_vq->lock, flags);
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do {
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virtqueue_disable_cb(vq);
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req_done += virtblk_handle_req(vblk_vq, &iob);
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if (unlikely(virtqueue_is_broken(vq)))
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break;
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} while (!virtqueue_enable_cb(vq));
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if (req_done) {
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if (!rq_list_empty(iob.req_list))
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iob.complete(&iob);
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/* In case queue is stopped waiting for more buffers. */
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blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
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}
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spin_unlock_irqrestore(&vblk_vq->lock, flags);
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}
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static void virtio_commit_rqs(struct blk_mq_hw_ctx *hctx)
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{
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struct virtio_blk *vblk = hctx->queue->queuedata;
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struct virtio_blk_vq *vq = &vblk->vqs[hctx->queue_num];
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bool kick;
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spin_lock_irq(&vq->lock);
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kick = virtqueue_kick_prepare(vq->vq);
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spin_unlock_irq(&vq->lock);
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if (kick)
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virtqueue_notify(vq->vq);
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}
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static blk_status_t virtblk_fail_to_queue(struct request *req, int rc)
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{
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virtblk_cleanup_cmd(req);
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switch (rc) {
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case -ENOSPC:
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return BLK_STS_DEV_RESOURCE;
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case -ENOMEM:
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return BLK_STS_RESOURCE;
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default:
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return BLK_STS_IOERR;
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}
|
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}
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|
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static blk_status_t virtblk_prep_rq(struct blk_mq_hw_ctx *hctx,
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struct virtio_blk *vblk,
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struct request *req,
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struct virtblk_req *vbr)
|
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{
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blk_status_t status;
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int num;
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|
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status = virtblk_setup_cmd(vblk->vdev, req, vbr);
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if (unlikely(status))
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return status;
|
|
|
|
num = virtblk_map_data(hctx, req, vbr);
|
|
if (unlikely(num < 0))
|
|
return virtblk_fail_to_queue(req, -ENOMEM);
|
|
vbr->sg_table.nents = num;
|
|
|
|
blk_mq_start_request(req);
|
|
|
|
return BLK_STS_OK;
|
|
}
|
|
|
|
static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx,
|
|
const struct blk_mq_queue_data *bd)
|
|
{
|
|
struct virtio_blk *vblk = hctx->queue->queuedata;
|
|
struct request *req = bd->rq;
|
|
struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
|
|
unsigned long flags;
|
|
int qid = hctx->queue_num;
|
|
bool notify = false;
|
|
blk_status_t status;
|
|
int err;
|
|
|
|
status = virtblk_prep_rq(hctx, vblk, req, vbr);
|
|
if (unlikely(status))
|
|
return status;
|
|
|
|
spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
|
|
err = virtblk_add_req(vblk->vqs[qid].vq, vbr);
|
|
if (err) {
|
|
virtqueue_kick(vblk->vqs[qid].vq);
|
|
/* Don't stop the queue if -ENOMEM: we may have failed to
|
|
* bounce the buffer due to global resource outage.
|
|
*/
|
|
if (err == -ENOSPC)
|
|
blk_mq_stop_hw_queue(hctx);
|
|
spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
|
|
virtblk_unmap_data(req, vbr);
|
|
return virtblk_fail_to_queue(req, err);
|
|
}
|
|
|
|
if (bd->last && virtqueue_kick_prepare(vblk->vqs[qid].vq))
|
|
notify = true;
|
|
spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
|
|
|
|
if (notify)
|
|
virtqueue_notify(vblk->vqs[qid].vq);
|
|
return BLK_STS_OK;
|
|
}
|
|
|
|
static bool virtblk_prep_rq_batch(struct request *req)
|
|
{
|
|
struct virtio_blk *vblk = req->mq_hctx->queue->queuedata;
|
|
struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
|
|
|
|
req->mq_hctx->tags->rqs[req->tag] = req;
|
|
|
|
return virtblk_prep_rq(req->mq_hctx, vblk, req, vbr) == BLK_STS_OK;
|
|
}
|
|
|
|
static bool virtblk_add_req_batch(struct virtio_blk_vq *vq,
|
|
struct request **rqlist)
|
|
{
|
|
unsigned long flags;
|
|
int err;
|
|
bool kick;
|
|
|
|
spin_lock_irqsave(&vq->lock, flags);
|
|
|
|
while (!rq_list_empty(*rqlist)) {
|
|
struct request *req = rq_list_pop(rqlist);
|
|
struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
|
|
|
|
err = virtblk_add_req(vq->vq, vbr);
|
|
if (err) {
|
|
virtblk_unmap_data(req, vbr);
|
|
virtblk_cleanup_cmd(req);
|
|
blk_mq_requeue_request(req, true);
|
|
}
|
|
}
|
|
|
|
kick = virtqueue_kick_prepare(vq->vq);
|
|
spin_unlock_irqrestore(&vq->lock, flags);
|
|
|
|
return kick;
|
|
}
|
|
|
|
static void virtio_queue_rqs(struct request **rqlist)
|
|
{
|
|
struct request *req, *next, *prev = NULL;
|
|
struct request *requeue_list = NULL;
|
|
|
|
rq_list_for_each_safe(rqlist, req, next) {
|
|
struct virtio_blk_vq *vq = get_virtio_blk_vq(req->mq_hctx);
|
|
bool kick;
|
|
|
|
if (!virtblk_prep_rq_batch(req)) {
|
|
rq_list_move(rqlist, &requeue_list, req, prev);
|
|
req = prev;
|
|
if (!req)
|
|
continue;
|
|
}
|
|
|
|
if (!next || req->mq_hctx != next->mq_hctx) {
|
|
req->rq_next = NULL;
|
|
kick = virtblk_add_req_batch(vq, rqlist);
|
|
if (kick)
|
|
virtqueue_notify(vq->vq);
|
|
|
|
*rqlist = next;
|
|
prev = NULL;
|
|
} else
|
|
prev = req;
|
|
}
|
|
|
|
*rqlist = requeue_list;
|
|
}
|
|
|
|
#ifdef CONFIG_BLK_DEV_ZONED
|
|
static void *virtblk_alloc_report_buffer(struct virtio_blk *vblk,
|
|
unsigned int nr_zones,
|
|
unsigned int zone_sectors,
|
|
size_t *buflen)
|
|
{
|
|
struct request_queue *q = vblk->disk->queue;
|
|
size_t bufsize;
|
|
void *buf;
|
|
|
|
nr_zones = min_t(unsigned int, nr_zones,
|
|
get_capacity(vblk->disk) >> ilog2(zone_sectors));
|
|
|
|
bufsize = sizeof(struct virtio_blk_zone_report) +
|
|
nr_zones * sizeof(struct virtio_blk_zone_descriptor);
|
|
bufsize = min_t(size_t, bufsize,
|
|
queue_max_hw_sectors(q) << SECTOR_SHIFT);
|
|
bufsize = min_t(size_t, bufsize, queue_max_segments(q) << PAGE_SHIFT);
|
|
|
|
while (bufsize >= sizeof(struct virtio_blk_zone_report)) {
|
|
buf = __vmalloc(bufsize, GFP_KERNEL | __GFP_NORETRY);
|
|
if (buf) {
|
|
*buflen = bufsize;
|
|
return buf;
|
|
}
|
|
bufsize >>= 1;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int virtblk_submit_zone_report(struct virtio_blk *vblk,
|
|
char *report_buf, size_t report_len,
|
|
sector_t sector)
|
|
{
|
|
struct request_queue *q = vblk->disk->queue;
|
|
struct request *req;
|
|
struct virtblk_req *vbr;
|
|
int err;
|
|
|
|
req = blk_mq_alloc_request(q, REQ_OP_DRV_IN, 0);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
|
|
vbr = blk_mq_rq_to_pdu(req);
|
|
vbr->in_hdr_len = sizeof(vbr->status);
|
|
vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_ZONE_REPORT);
|
|
vbr->out_hdr.sector = cpu_to_virtio64(vblk->vdev, sector);
|
|
|
|
err = blk_rq_map_kern(q, req, report_buf, report_len, GFP_KERNEL);
|
|
if (err)
|
|
goto out;
|
|
|
|
blk_execute_rq(req, false);
|
|
err = blk_status_to_errno(virtblk_result(vbr->status));
|
|
out:
|
|
blk_mq_free_request(req);
|
|
return err;
|
|
}
|
|
|
|
static int virtblk_parse_zone(struct virtio_blk *vblk,
|
|
struct virtio_blk_zone_descriptor *entry,
|
|
unsigned int idx, unsigned int zone_sectors,
|
|
report_zones_cb cb, void *data)
|
|
{
|
|
struct blk_zone zone = { };
|
|
|
|
if (entry->z_type != VIRTIO_BLK_ZT_SWR &&
|
|
entry->z_type != VIRTIO_BLK_ZT_SWP &&
|
|
entry->z_type != VIRTIO_BLK_ZT_CONV) {
|
|
dev_err(&vblk->vdev->dev, "invalid zone type %#x\n",
|
|
entry->z_type);
|
|
return -EINVAL;
|
|
}
|
|
|
|
zone.type = entry->z_type;
|
|
zone.cond = entry->z_state;
|
|
zone.len = zone_sectors;
|
|
zone.capacity = le64_to_cpu(entry->z_cap);
|
|
zone.start = le64_to_cpu(entry->z_start);
|
|
if (zone.cond == BLK_ZONE_COND_FULL)
|
|
zone.wp = zone.start + zone.len;
|
|
else
|
|
zone.wp = le64_to_cpu(entry->z_wp);
|
|
|
|
return cb(&zone, idx, data);
|
|
}
|
|
|
|
static int virtblk_report_zones(struct gendisk *disk, sector_t sector,
|
|
unsigned int nr_zones, report_zones_cb cb,
|
|
void *data)
|
|
{
|
|
struct virtio_blk *vblk = disk->private_data;
|
|
struct virtio_blk_zone_report *report;
|
|
unsigned int zone_sectors = vblk->zone_sectors;
|
|
unsigned int nz, i;
|
|
int ret, zone_idx = 0;
|
|
size_t buflen;
|
|
|
|
if (WARN_ON_ONCE(!vblk->zone_sectors))
|
|
return -EOPNOTSUPP;
|
|
|
|
report = virtblk_alloc_report_buffer(vblk, nr_zones,
|
|
zone_sectors, &buflen);
|
|
if (!report)
|
|
return -ENOMEM;
|
|
|
|
while (zone_idx < nr_zones && sector < get_capacity(vblk->disk)) {
|
|
memset(report, 0, buflen);
|
|
|
|
ret = virtblk_submit_zone_report(vblk, (char *)report,
|
|
buflen, sector);
|
|
if (ret) {
|
|
if (ret > 0)
|
|
ret = -EIO;
|
|
goto out_free;
|
|
}
|
|
nz = min((unsigned int)le64_to_cpu(report->nr_zones), nr_zones);
|
|
if (!nz)
|
|
break;
|
|
|
|
for (i = 0; i < nz && zone_idx < nr_zones; i++) {
|
|
ret = virtblk_parse_zone(vblk, &report->zones[i],
|
|
zone_idx, zone_sectors, cb, data);
|
|
if (ret)
|
|
goto out_free;
|
|
sector = le64_to_cpu(report->zones[i].z_start) + zone_sectors;
|
|
zone_idx++;
|
|
}
|
|
}
|
|
|
|
if (zone_idx > 0)
|
|
ret = zone_idx;
|
|
else
|
|
ret = -EINVAL;
|
|
out_free:
|
|
kvfree(report);
|
|
return ret;
|
|
}
|
|
|
|
static void virtblk_revalidate_zones(struct virtio_blk *vblk)
|
|
{
|
|
u8 model;
|
|
|
|
if (!vblk->zone_sectors)
|
|
return;
|
|
|
|
virtio_cread(vblk->vdev, struct virtio_blk_config,
|
|
zoned.model, &model);
|
|
if (!blk_revalidate_disk_zones(vblk->disk, NULL))
|
|
set_capacity_and_notify(vblk->disk, 0);
|
|
}
|
|
|
|
static int virtblk_probe_zoned_device(struct virtio_device *vdev,
|
|
struct virtio_blk *vblk,
|
|
struct request_queue *q)
|
|
{
|
|
u32 v;
|
|
u8 model;
|
|
int ret;
|
|
|
|
virtio_cread(vdev, struct virtio_blk_config,
|
|
zoned.model, &model);
|
|
|
|
switch (model) {
|
|
case VIRTIO_BLK_Z_NONE:
|
|
return 0;
|
|
case VIRTIO_BLK_Z_HM:
|
|
break;
|
|
case VIRTIO_BLK_Z_HA:
|
|
/*
|
|
* Present the host-aware device as a regular drive.
|
|
* TODO It is possible to add an option to make it appear
|
|
* in the system as a zoned drive.
|
|
*/
|
|
return 0;
|
|
default:
|
|
dev_err(&vdev->dev, "unsupported zone model %d\n", model);
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev_dbg(&vdev->dev, "probing host-managed zoned device\n");
|
|
|
|
disk_set_zoned(vblk->disk, BLK_ZONED_HM);
|
|
blk_queue_flag_set(QUEUE_FLAG_ZONE_RESETALL, q);
|
|
|
|
virtio_cread(vdev, struct virtio_blk_config,
|
|
zoned.max_open_zones, &v);
|
|
disk_set_max_open_zones(vblk->disk, le32_to_cpu(v));
|
|
|
|
dev_dbg(&vdev->dev, "max open zones = %u\n", le32_to_cpu(v));
|
|
|
|
virtio_cread(vdev, struct virtio_blk_config,
|
|
zoned.max_active_zones, &v);
|
|
disk_set_max_active_zones(vblk->disk, le32_to_cpu(v));
|
|
dev_dbg(&vdev->dev, "max active zones = %u\n", le32_to_cpu(v));
|
|
|
|
virtio_cread(vdev, struct virtio_blk_config,
|
|
zoned.write_granularity, &v);
|
|
if (!v) {
|
|
dev_warn(&vdev->dev, "zero write granularity reported\n");
|
|
return -ENODEV;
|
|
}
|
|
blk_queue_physical_block_size(q, le32_to_cpu(v));
|
|
blk_queue_io_min(q, le32_to_cpu(v));
|
|
|
|
dev_dbg(&vdev->dev, "write granularity = %u\n", le32_to_cpu(v));
|
|
|
|
/*
|
|
* virtio ZBD specification doesn't require zones to be a power of
|
|
* two sectors in size, but the code in this driver expects that.
|
|
*/
|
|
virtio_cread(vdev, struct virtio_blk_config, zoned.zone_sectors, &v);
|
|
vblk->zone_sectors = le32_to_cpu(v);
|
|
if (vblk->zone_sectors == 0 || !is_power_of_2(vblk->zone_sectors)) {
|
|
dev_err(&vdev->dev,
|
|
"zoned device with non power of two zone size %u\n",
|
|
vblk->zone_sectors);
|
|
return -ENODEV;
|
|
}
|
|
dev_dbg(&vdev->dev, "zone sectors = %u\n", vblk->zone_sectors);
|
|
|
|
if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD)) {
|
|
dev_warn(&vblk->vdev->dev,
|
|
"ignoring negotiated F_DISCARD for zoned device\n");
|
|
blk_queue_max_discard_sectors(q, 0);
|
|
}
|
|
|
|
ret = blk_revalidate_disk_zones(vblk->disk, NULL);
|
|
if (!ret) {
|
|
virtio_cread(vdev, struct virtio_blk_config,
|
|
zoned.max_append_sectors, &v);
|
|
if (!v) {
|
|
dev_warn(&vdev->dev, "zero max_append_sectors reported\n");
|
|
return -ENODEV;
|
|
}
|
|
blk_queue_max_zone_append_sectors(q, le32_to_cpu(v));
|
|
dev_dbg(&vdev->dev, "max append sectors = %u\n", le32_to_cpu(v));
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline bool virtblk_has_zoned_feature(struct virtio_device *vdev)
|
|
{
|
|
return virtio_has_feature(vdev, VIRTIO_BLK_F_ZONED);
|
|
}
|
|
#else
|
|
|
|
/*
|
|
* Zoned block device support is not configured in this kernel.
|
|
* We only need to define a few symbols to avoid compilation errors.
|
|
*/
|
|
#define virtblk_report_zones NULL
|
|
static inline void virtblk_revalidate_zones(struct virtio_blk *vblk)
|
|
{
|
|
}
|
|
static inline int virtblk_probe_zoned_device(struct virtio_device *vdev,
|
|
struct virtio_blk *vblk, struct request_queue *q)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline bool virtblk_has_zoned_feature(struct virtio_device *vdev)
|
|
{
|
|
return false;
|
|
}
|
|
#endif /* CONFIG_BLK_DEV_ZONED */
|
|
|
|
/* return id (s/n) string for *disk to *id_str
|
|
*/
|
|
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_mq_alloc_request(q, REQ_OP_DRV_IN, 0);
|
|
if (IS_ERR(req))
|
|
return PTR_ERR(req);
|
|
|
|
vbr = blk_mq_rq_to_pdu(req);
|
|
vbr->in_hdr_len = sizeof(vbr->status);
|
|
vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_GET_ID);
|
|
vbr->out_hdr.sector = 0;
|
|
|
|
err = blk_rq_map_kern(q, req, id_str, VIRTIO_BLK_ID_BYTES, GFP_KERNEL);
|
|
if (err)
|
|
goto out;
|
|
|
|
blk_execute_rq(req, false);
|
|
err = blk_status_to_errno(virtblk_result(vbr->status));
|
|
out:
|
|
blk_mq_free_request(req);
|
|
return err;
|
|
}
|
|
|
|
/* We provide getgeo only to please some old bootloader/partitioning tools */
|
|
static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
|
|
{
|
|
struct virtio_blk *vblk = bd->bd_disk->private_data;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&vblk->vdev_mutex);
|
|
|
|
if (!vblk->vdev) {
|
|
ret = -ENXIO;
|
|
goto out;
|
|
}
|
|
|
|
/* see if the host passed in geometry config */
|
|
if (virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_GEOMETRY)) {
|
|
virtio_cread(vblk->vdev, struct virtio_blk_config,
|
|
geometry.cylinders, &geo->cylinders);
|
|
virtio_cread(vblk->vdev, struct virtio_blk_config,
|
|
geometry.heads, &geo->heads);
|
|
virtio_cread(vblk->vdev, struct virtio_blk_config,
|
|
geometry.sectors, &geo->sectors);
|
|
} else {
|
|
/* some standard values, similar to sd */
|
|
geo->heads = 1 << 6;
|
|
geo->sectors = 1 << 5;
|
|
geo->cylinders = get_capacity(bd->bd_disk) >> 11;
|
|
}
|
|
out:
|
|
mutex_unlock(&vblk->vdev_mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void virtblk_free_disk(struct gendisk *disk)
|
|
{
|
|
struct virtio_blk *vblk = disk->private_data;
|
|
|
|
ida_free(&vd_index_ida, vblk->index);
|
|
mutex_destroy(&vblk->vdev_mutex);
|
|
kfree(vblk);
|
|
}
|
|
|
|
static const struct block_device_operations virtblk_fops = {
|
|
.owner = THIS_MODULE,
|
|
.getgeo = virtblk_getgeo,
|
|
.free_disk = virtblk_free_disk,
|
|
.report_zones = virtblk_report_zones,
|
|
};
|
|
|
|
static int index_to_minor(int index)
|
|
{
|
|
return index << PART_BITS;
|
|
}
|
|
|
|
static int minor_to_index(int minor)
|
|
{
|
|
return minor >> PART_BITS;
|
|
}
|
|
|
|
static ssize_t serial_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct gendisk *disk = dev_to_disk(dev);
|
|
int err;
|
|
|
|
/* sysfs gives us a PAGE_SIZE buffer */
|
|
BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES);
|
|
|
|
buf[VIRTIO_BLK_ID_BYTES] = '\0';
|
|
err = virtblk_get_id(disk, buf);
|
|
if (!err)
|
|
return strlen(buf);
|
|
|
|
if (err == -EIO) /* Unsupported? Make it empty. */
|
|
return 0;
|
|
|
|
return err;
|
|
}
|
|
|
|
static DEVICE_ATTR_RO(serial);
|
|
|
|
/* The queue's logical block size must be set before calling this */
|
|
static void virtblk_update_capacity(struct virtio_blk *vblk, bool resize)
|
|
{
|
|
struct virtio_device *vdev = vblk->vdev;
|
|
struct request_queue *q = vblk->disk->queue;
|
|
char cap_str_2[10], cap_str_10[10];
|
|
unsigned long long nblocks;
|
|
u64 capacity;
|
|
|
|
/* Host must always specify the capacity. */
|
|
virtio_cread(vdev, struct virtio_blk_config, capacity, &capacity);
|
|
|
|
nblocks = DIV_ROUND_UP_ULL(capacity, queue_logical_block_size(q) >> 9);
|
|
|
|
string_get_size(nblocks, queue_logical_block_size(q),
|
|
STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
|
|
string_get_size(nblocks, queue_logical_block_size(q),
|
|
STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
|
|
|
|
dev_notice(&vdev->dev,
|
|
"[%s] %s%llu %d-byte logical blocks (%s/%s)\n",
|
|
vblk->disk->disk_name,
|
|
resize ? "new size: " : "",
|
|
nblocks,
|
|
queue_logical_block_size(q),
|
|
cap_str_10,
|
|
cap_str_2);
|
|
|
|
set_capacity_and_notify(vblk->disk, capacity);
|
|
}
|
|
|
|
static void virtblk_config_changed_work(struct work_struct *work)
|
|
{
|
|
struct virtio_blk *vblk =
|
|
container_of(work, struct virtio_blk, config_work);
|
|
|
|
virtblk_revalidate_zones(vblk);
|
|
virtblk_update_capacity(vblk, true);
|
|
}
|
|
|
|
static void virtblk_config_changed(struct virtio_device *vdev)
|
|
{
|
|
struct virtio_blk *vblk = vdev->priv;
|
|
|
|
queue_work(virtblk_wq, &vblk->config_work);
|
|
}
|
|
|
|
static int init_vq(struct virtio_blk *vblk)
|
|
{
|
|
int err;
|
|
int i;
|
|
vq_callback_t **callbacks;
|
|
const char **names;
|
|
struct virtqueue **vqs;
|
|
unsigned short num_vqs;
|
|
unsigned int num_poll_vqs;
|
|
struct virtio_device *vdev = vblk->vdev;
|
|
struct irq_affinity desc = { 0, };
|
|
|
|
err = virtio_cread_feature(vdev, VIRTIO_BLK_F_MQ,
|
|
struct virtio_blk_config, num_queues,
|
|
&num_vqs);
|
|
if (err)
|
|
num_vqs = 1;
|
|
|
|
if (!err && !num_vqs) {
|
|
dev_err(&vdev->dev, "MQ advertised but zero queues reported\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
num_vqs = min_t(unsigned int,
|
|
min_not_zero(num_request_queues, nr_cpu_ids),
|
|
num_vqs);
|
|
|
|
num_poll_vqs = min_t(unsigned int, poll_queues, num_vqs - 1);
|
|
|
|
vblk->io_queues[HCTX_TYPE_DEFAULT] = num_vqs - num_poll_vqs;
|
|
vblk->io_queues[HCTX_TYPE_READ] = 0;
|
|
vblk->io_queues[HCTX_TYPE_POLL] = num_poll_vqs;
|
|
|
|
dev_info(&vdev->dev, "%d/%d/%d default/read/poll queues\n",
|
|
vblk->io_queues[HCTX_TYPE_DEFAULT],
|
|
vblk->io_queues[HCTX_TYPE_READ],
|
|
vblk->io_queues[HCTX_TYPE_POLL]);
|
|
|
|
vblk->vqs = kmalloc_array(num_vqs, sizeof(*vblk->vqs), GFP_KERNEL);
|
|
if (!vblk->vqs)
|
|
return -ENOMEM;
|
|
|
|
names = kmalloc_array(num_vqs, sizeof(*names), GFP_KERNEL);
|
|
callbacks = kmalloc_array(num_vqs, sizeof(*callbacks), GFP_KERNEL);
|
|
vqs = kmalloc_array(num_vqs, sizeof(*vqs), GFP_KERNEL);
|
|
if (!names || !callbacks || !vqs) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
for (i = 0; i < num_vqs - num_poll_vqs; i++) {
|
|
callbacks[i] = virtblk_done;
|
|
snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req.%d", i);
|
|
names[i] = vblk->vqs[i].name;
|
|
}
|
|
|
|
for (; i < num_vqs; i++) {
|
|
callbacks[i] = NULL;
|
|
snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req_poll.%d", i);
|
|
names[i] = vblk->vqs[i].name;
|
|
}
|
|
|
|
/* Discover virtqueues and write information to configuration. */
|
|
err = virtio_find_vqs(vdev, num_vqs, vqs, callbacks, names, &desc);
|
|
if (err)
|
|
goto out;
|
|
|
|
for (i = 0; i < num_vqs; i++) {
|
|
spin_lock_init(&vblk->vqs[i].lock);
|
|
vblk->vqs[i].vq = vqs[i];
|
|
}
|
|
vblk->num_vqs = num_vqs;
|
|
|
|
out:
|
|
kfree(vqs);
|
|
kfree(callbacks);
|
|
kfree(names);
|
|
if (err)
|
|
kfree(vblk->vqs);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Legacy naming scheme used for virtio devices. We are stuck with it for
|
|
* virtio blk but don't ever use it for any new driver.
|
|
*/
|
|
static int virtblk_name_format(char *prefix, int index, char *buf, int buflen)
|
|
{
|
|
const int base = 'z' - 'a' + 1;
|
|
char *begin = buf + strlen(prefix);
|
|
char *end = buf + buflen;
|
|
char *p;
|
|
int unit;
|
|
|
|
p = end - 1;
|
|
*p = '\0';
|
|
unit = base;
|
|
do {
|
|
if (p == begin)
|
|
return -EINVAL;
|
|
*--p = 'a' + (index % unit);
|
|
index = (index / unit) - 1;
|
|
} while (index >= 0);
|
|
|
|
memmove(begin, p, end - p);
|
|
memcpy(buf, prefix, strlen(prefix));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int virtblk_get_cache_mode(struct virtio_device *vdev)
|
|
{
|
|
u8 writeback;
|
|
int err;
|
|
|
|
err = virtio_cread_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE,
|
|
struct virtio_blk_config, wce,
|
|
&writeback);
|
|
|
|
/*
|
|
* If WCE is not configurable and flush is not available,
|
|
* assume no writeback cache is in use.
|
|
*/
|
|
if (err)
|
|
writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH);
|
|
|
|
return writeback;
|
|
}
|
|
|
|
static void virtblk_update_cache_mode(struct virtio_device *vdev)
|
|
{
|
|
u8 writeback = virtblk_get_cache_mode(vdev);
|
|
struct virtio_blk *vblk = vdev->priv;
|
|
|
|
blk_queue_write_cache(vblk->disk->queue, writeback, false);
|
|
}
|
|
|
|
static const char *const virtblk_cache_types[] = {
|
|
"write through", "write back"
|
|
};
|
|
|
|
static ssize_t
|
|
cache_type_store(struct device *dev, struct device_attribute *attr,
|
|
const char *buf, size_t count)
|
|
{
|
|
struct gendisk *disk = dev_to_disk(dev);
|
|
struct virtio_blk *vblk = disk->private_data;
|
|
struct virtio_device *vdev = vblk->vdev;
|
|
int i;
|
|
|
|
BUG_ON(!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_CONFIG_WCE));
|
|
i = sysfs_match_string(virtblk_cache_types, buf);
|
|
if (i < 0)
|
|
return i;
|
|
|
|
virtio_cwrite8(vdev, offsetof(struct virtio_blk_config, wce), i);
|
|
virtblk_update_cache_mode(vdev);
|
|
return count;
|
|
}
|
|
|
|
static ssize_t
|
|
cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
|
|
{
|
|
struct gendisk *disk = dev_to_disk(dev);
|
|
struct virtio_blk *vblk = disk->private_data;
|
|
u8 writeback = virtblk_get_cache_mode(vblk->vdev);
|
|
|
|
BUG_ON(writeback >= ARRAY_SIZE(virtblk_cache_types));
|
|
return sysfs_emit(buf, "%s\n", virtblk_cache_types[writeback]);
|
|
}
|
|
|
|
static DEVICE_ATTR_RW(cache_type);
|
|
|
|
static struct attribute *virtblk_attrs[] = {
|
|
&dev_attr_serial.attr,
|
|
&dev_attr_cache_type.attr,
|
|
NULL,
|
|
};
|
|
|
|
static umode_t virtblk_attrs_are_visible(struct kobject *kobj,
|
|
struct attribute *a, int n)
|
|
{
|
|
struct device *dev = kobj_to_dev(kobj);
|
|
struct gendisk *disk = dev_to_disk(dev);
|
|
struct virtio_blk *vblk = disk->private_data;
|
|
struct virtio_device *vdev = vblk->vdev;
|
|
|
|
if (a == &dev_attr_cache_type.attr &&
|
|
!virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE))
|
|
return S_IRUGO;
|
|
|
|
return a->mode;
|
|
}
|
|
|
|
static const struct attribute_group virtblk_attr_group = {
|
|
.attrs = virtblk_attrs,
|
|
.is_visible = virtblk_attrs_are_visible,
|
|
};
|
|
|
|
static const struct attribute_group *virtblk_attr_groups[] = {
|
|
&virtblk_attr_group,
|
|
NULL,
|
|
};
|
|
|
|
static void virtblk_map_queues(struct blk_mq_tag_set *set)
|
|
{
|
|
struct virtio_blk *vblk = set->driver_data;
|
|
int i, qoff;
|
|
|
|
for (i = 0, qoff = 0; i < set->nr_maps; i++) {
|
|
struct blk_mq_queue_map *map = &set->map[i];
|
|
|
|
map->nr_queues = vblk->io_queues[i];
|
|
map->queue_offset = qoff;
|
|
qoff += map->nr_queues;
|
|
|
|
if (map->nr_queues == 0)
|
|
continue;
|
|
|
|
/*
|
|
* Regular queues have interrupts and hence CPU affinity is
|
|
* defined by the core virtio code, but polling queues have
|
|
* no interrupts so we let the block layer assign CPU affinity.
|
|
*/
|
|
if (i == HCTX_TYPE_POLL)
|
|
blk_mq_map_queues(&set->map[i]);
|
|
else
|
|
blk_mq_virtio_map_queues(&set->map[i], vblk->vdev, 0);
|
|
}
|
|
}
|
|
|
|
static int virtblk_poll(struct blk_mq_hw_ctx *hctx, struct io_comp_batch *iob)
|
|
{
|
|
struct virtio_blk *vblk = hctx->queue->queuedata;
|
|
struct virtio_blk_vq *vq = get_virtio_blk_vq(hctx);
|
|
unsigned long flags;
|
|
int found = 0;
|
|
|
|
spin_lock_irqsave(&vq->lock, flags);
|
|
found = virtblk_handle_req(vq, iob);
|
|
|
|
if (found)
|
|
blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
|
|
|
|
spin_unlock_irqrestore(&vq->lock, flags);
|
|
|
|
return found;
|
|
}
|
|
|
|
static const struct blk_mq_ops virtio_mq_ops = {
|
|
.queue_rq = virtio_queue_rq,
|
|
.queue_rqs = virtio_queue_rqs,
|
|
.commit_rqs = virtio_commit_rqs,
|
|
.complete = virtblk_request_done,
|
|
.map_queues = virtblk_map_queues,
|
|
.poll = virtblk_poll,
|
|
};
|
|
|
|
static unsigned int virtblk_queue_depth;
|
|
module_param_named(queue_depth, virtblk_queue_depth, uint, 0444);
|
|
|
|
static int virtblk_probe(struct virtio_device *vdev)
|
|
{
|
|
struct virtio_blk *vblk;
|
|
struct request_queue *q;
|
|
int err, index;
|
|
|
|
u32 v, blk_size, max_size, sg_elems, opt_io_size;
|
|
u32 max_discard_segs = 0;
|
|
u32 discard_granularity = 0;
|
|
u16 min_io_size;
|
|
u8 physical_block_exp, alignment_offset;
|
|
unsigned int queue_depth;
|
|
|
|
if (!vdev->config->get) {
|
|
dev_err(&vdev->dev, "%s failure: config access disabled\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = ida_alloc_range(&vd_index_ida, 0,
|
|
minor_to_index(1 << MINORBITS) - 1, GFP_KERNEL);
|
|
if (err < 0)
|
|
goto out;
|
|
index = err;
|
|
|
|
/* We need to know how many segments before we allocate. */
|
|
err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SEG_MAX,
|
|
struct virtio_blk_config, seg_max,
|
|
&sg_elems);
|
|
|
|
/* We need at least one SG element, whatever they say. */
|
|
if (err || !sg_elems)
|
|
sg_elems = 1;
|
|
|
|
/* Prevent integer overflows and honor max vq size */
|
|
sg_elems = min_t(u32, sg_elems, VIRTIO_BLK_MAX_SG_ELEMS - 2);
|
|
|
|
vdev->priv = vblk = kmalloc(sizeof(*vblk), GFP_KERNEL);
|
|
if (!vblk) {
|
|
err = -ENOMEM;
|
|
goto out_free_index;
|
|
}
|
|
|
|
mutex_init(&vblk->vdev_mutex);
|
|
|
|
vblk->vdev = vdev;
|
|
|
|
INIT_WORK(&vblk->config_work, virtblk_config_changed_work);
|
|
|
|
err = init_vq(vblk);
|
|
if (err)
|
|
goto out_free_vblk;
|
|
|
|
/* Default queue sizing is to fill the ring. */
|
|
if (!virtblk_queue_depth) {
|
|
queue_depth = vblk->vqs[0].vq->num_free;
|
|
/* ... but without indirect descs, we use 2 descs per req */
|
|
if (!virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC))
|
|
queue_depth /= 2;
|
|
} else {
|
|
queue_depth = virtblk_queue_depth;
|
|
}
|
|
|
|
memset(&vblk->tag_set, 0, sizeof(vblk->tag_set));
|
|
vblk->tag_set.ops = &virtio_mq_ops;
|
|
vblk->tag_set.queue_depth = queue_depth;
|
|
vblk->tag_set.numa_node = NUMA_NO_NODE;
|
|
vblk->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
|
|
vblk->tag_set.cmd_size =
|
|
sizeof(struct virtblk_req) +
|
|
sizeof(struct scatterlist) * VIRTIO_BLK_INLINE_SG_CNT;
|
|
vblk->tag_set.driver_data = vblk;
|
|
vblk->tag_set.nr_hw_queues = vblk->num_vqs;
|
|
vblk->tag_set.nr_maps = 1;
|
|
if (vblk->io_queues[HCTX_TYPE_POLL])
|
|
vblk->tag_set.nr_maps = 3;
|
|
|
|
err = blk_mq_alloc_tag_set(&vblk->tag_set);
|
|
if (err)
|
|
goto out_free_vq;
|
|
|
|
vblk->disk = blk_mq_alloc_disk(&vblk->tag_set, vblk);
|
|
if (IS_ERR(vblk->disk)) {
|
|
err = PTR_ERR(vblk->disk);
|
|
goto out_free_tags;
|
|
}
|
|
q = vblk->disk->queue;
|
|
|
|
virtblk_name_format("vd", index, vblk->disk->disk_name, DISK_NAME_LEN);
|
|
|
|
vblk->disk->major = major;
|
|
vblk->disk->first_minor = index_to_minor(index);
|
|
vblk->disk->minors = 1 << PART_BITS;
|
|
vblk->disk->private_data = vblk;
|
|
vblk->disk->fops = &virtblk_fops;
|
|
vblk->index = index;
|
|
|
|
/* configure queue flush support */
|
|
virtblk_update_cache_mode(vdev);
|
|
|
|
/* If disk is read-only in the host, the guest should obey */
|
|
if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))
|
|
set_disk_ro(vblk->disk, 1);
|
|
|
|
/* We can handle whatever the host told us to handle. */
|
|
blk_queue_max_segments(q, sg_elems);
|
|
|
|
/* No real sector limit. */
|
|
blk_queue_max_hw_sectors(q, UINT_MAX);
|
|
|
|
max_size = virtio_max_dma_size(vdev);
|
|
|
|
/* Host can optionally specify maximum segment size and number of
|
|
* segments. */
|
|
err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SIZE_MAX,
|
|
struct virtio_blk_config, size_max, &v);
|
|
if (!err)
|
|
max_size = min(max_size, v);
|
|
|
|
blk_queue_max_segment_size(q, max_size);
|
|
|
|
/* Host can optionally specify the block size of the device */
|
|
err = virtio_cread_feature(vdev, VIRTIO_BLK_F_BLK_SIZE,
|
|
struct virtio_blk_config, blk_size,
|
|
&blk_size);
|
|
if (!err) {
|
|
err = blk_validate_block_size(blk_size);
|
|
if (err) {
|
|
dev_err(&vdev->dev,
|
|
"virtio_blk: invalid block size: 0x%x\n",
|
|
blk_size);
|
|
goto out_cleanup_disk;
|
|
}
|
|
|
|
blk_queue_logical_block_size(q, blk_size);
|
|
} else
|
|
blk_size = queue_logical_block_size(q);
|
|
|
|
/* Use topology information if available */
|
|
err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
|
|
struct virtio_blk_config, physical_block_exp,
|
|
&physical_block_exp);
|
|
if (!err && physical_block_exp)
|
|
blk_queue_physical_block_size(q,
|
|
blk_size * (1 << physical_block_exp));
|
|
|
|
err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
|
|
struct virtio_blk_config, alignment_offset,
|
|
&alignment_offset);
|
|
if (!err && alignment_offset)
|
|
blk_queue_alignment_offset(q, blk_size * alignment_offset);
|
|
|
|
err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
|
|
struct virtio_blk_config, min_io_size,
|
|
&min_io_size);
|
|
if (!err && min_io_size)
|
|
blk_queue_io_min(q, blk_size * min_io_size);
|
|
|
|
err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
|
|
struct virtio_blk_config, opt_io_size,
|
|
&opt_io_size);
|
|
if (!err && opt_io_size)
|
|
blk_queue_io_opt(q, blk_size * opt_io_size);
|
|
|
|
if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD)) {
|
|
virtio_cread(vdev, struct virtio_blk_config,
|
|
discard_sector_alignment, &discard_granularity);
|
|
|
|
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,
|
|
&max_discard_segs);
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
/* The discard and secure erase limits are combined since the Linux
|
|
* block layer uses the same limit for both commands.
|
|
*
|
|
* If both VIRTIO_BLK_F_SECURE_ERASE and VIRTIO_BLK_F_DISCARD features
|
|
* are negotiated, we will use the minimum between the limits.
|
|
*
|
|
* discard sector alignment is set to the minimum between discard_sector_alignment
|
|
* and secure_erase_sector_alignment.
|
|
*
|
|
* max discard sectors is set to the minimum between max_discard_seg and
|
|
* max_secure_erase_seg.
|
|
*/
|
|
if (virtio_has_feature(vdev, VIRTIO_BLK_F_SECURE_ERASE)) {
|
|
|
|
virtio_cread(vdev, struct virtio_blk_config,
|
|
secure_erase_sector_alignment, &v);
|
|
|
|
/* secure_erase_sector_alignment should not be zero, the device should set a
|
|
* valid number of sectors.
|
|
*/
|
|
if (!v) {
|
|
dev_err(&vdev->dev,
|
|
"virtio_blk: secure_erase_sector_alignment can't be 0\n");
|
|
err = -EINVAL;
|
|
goto out_cleanup_disk;
|
|
}
|
|
|
|
discard_granularity = min_not_zero(discard_granularity, v);
|
|
|
|
virtio_cread(vdev, struct virtio_blk_config,
|
|
max_secure_erase_sectors, &v);
|
|
|
|
/* max_secure_erase_sectors should not be zero, the device should set a
|
|
* valid number of sectors.
|
|
*/
|
|
if (!v) {
|
|
dev_err(&vdev->dev,
|
|
"virtio_blk: max_secure_erase_sectors can't be 0\n");
|
|
err = -EINVAL;
|
|
goto out_cleanup_disk;
|
|
}
|
|
|
|
blk_queue_max_secure_erase_sectors(q, v);
|
|
|
|
virtio_cread(vdev, struct virtio_blk_config,
|
|
max_secure_erase_seg, &v);
|
|
|
|
/* max_secure_erase_seg should not be zero, the device should set a
|
|
* valid number of segments
|
|
*/
|
|
if (!v) {
|
|
dev_err(&vdev->dev,
|
|
"virtio_blk: max_secure_erase_seg can't be 0\n");
|
|
err = -EINVAL;
|
|
goto out_cleanup_disk;
|
|
}
|
|
|
|
max_discard_segs = min_not_zero(max_discard_segs, v);
|
|
}
|
|
|
|
if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD) ||
|
|
virtio_has_feature(vdev, VIRTIO_BLK_F_SECURE_ERASE)) {
|
|
/* max_discard_seg and discard_granularity will be 0 only
|
|
* if max_discard_seg and discard_sector_alignment fields in the virtio
|
|
* config are 0 and VIRTIO_BLK_F_SECURE_ERASE feature is not negotiated.
|
|
* In this case, we use default values.
|
|
*/
|
|
if (!max_discard_segs)
|
|
max_discard_segs = sg_elems;
|
|
|
|
blk_queue_max_discard_segments(q,
|
|
min(max_discard_segs, MAX_DISCARD_SEGMENTS));
|
|
|
|
if (discard_granularity)
|
|
q->limits.discard_granularity = discard_granularity << SECTOR_SHIFT;
|
|
else
|
|
q->limits.discard_granularity = blk_size;
|
|
}
|
|
|
|
virtblk_update_capacity(vblk, false);
|
|
virtio_device_ready(vdev);
|
|
|
|
if (virtblk_has_zoned_feature(vdev)) {
|
|
err = virtblk_probe_zoned_device(vdev, vblk, q);
|
|
if (err)
|
|
goto out_cleanup_disk;
|
|
}
|
|
|
|
dev_info(&vdev->dev, "blk config size: %zu\n",
|
|
sizeof(struct virtio_blk_config));
|
|
|
|
err = device_add_disk(&vdev->dev, vblk->disk, virtblk_attr_groups);
|
|
if (err)
|
|
goto out_cleanup_disk;
|
|
|
|
return 0;
|
|
|
|
out_cleanup_disk:
|
|
put_disk(vblk->disk);
|
|
out_free_tags:
|
|
blk_mq_free_tag_set(&vblk->tag_set);
|
|
out_free_vq:
|
|
vdev->config->del_vqs(vdev);
|
|
kfree(vblk->vqs);
|
|
out_free_vblk:
|
|
kfree(vblk);
|
|
out_free_index:
|
|
ida_free(&vd_index_ida, index);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static void virtblk_remove(struct virtio_device *vdev)
|
|
{
|
|
struct virtio_blk *vblk = vdev->priv;
|
|
|
|
/* Make sure no work handler is accessing the device. */
|
|
flush_work(&vblk->config_work);
|
|
|
|
del_gendisk(vblk->disk);
|
|
blk_mq_free_tag_set(&vblk->tag_set);
|
|
|
|
mutex_lock(&vblk->vdev_mutex);
|
|
|
|
/* Stop all the virtqueues. */
|
|
virtio_reset_device(vdev);
|
|
|
|
/* Virtqueues are stopped, nothing can use vblk->vdev anymore. */
|
|
vblk->vdev = NULL;
|
|
|
|
vdev->config->del_vqs(vdev);
|
|
kfree(vblk->vqs);
|
|
|
|
mutex_unlock(&vblk->vdev_mutex);
|
|
|
|
put_disk(vblk->disk);
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int virtblk_freeze(struct virtio_device *vdev)
|
|
{
|
|
struct virtio_blk *vblk = vdev->priv;
|
|
|
|
/* Ensure we don't receive any more interrupts */
|
|
virtio_reset_device(vdev);
|
|
|
|
/* Make sure no work handler is accessing the device. */
|
|
flush_work(&vblk->config_work);
|
|
|
|
blk_mq_quiesce_queue(vblk->disk->queue);
|
|
|
|
vdev->config->del_vqs(vdev);
|
|
kfree(vblk->vqs);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int virtblk_restore(struct virtio_device *vdev)
|
|
{
|
|
struct virtio_blk *vblk = vdev->priv;
|
|
int ret;
|
|
|
|
ret = init_vq(vdev->priv);
|
|
if (ret)
|
|
return ret;
|
|
|
|
virtio_device_ready(vdev);
|
|
|
|
blk_mq_unquiesce_queue(vblk->disk->queue);
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static const struct virtio_device_id id_table[] = {
|
|
{ VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
|
|
{ 0 },
|
|
};
|
|
|
|
static unsigned int features_legacy[] = {
|
|
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_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES,
|
|
VIRTIO_BLK_F_SECURE_ERASE,
|
|
}
|
|
;
|
|
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_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES,
|
|
VIRTIO_BLK_F_SECURE_ERASE,
|
|
#ifdef CONFIG_BLK_DEV_ZONED
|
|
VIRTIO_BLK_F_ZONED,
|
|
#endif /* CONFIG_BLK_DEV_ZONED */
|
|
};
|
|
|
|
static struct virtio_driver virtio_blk = {
|
|
.feature_table = features,
|
|
.feature_table_size = ARRAY_SIZE(features),
|
|
.feature_table_legacy = features_legacy,
|
|
.feature_table_size_legacy = ARRAY_SIZE(features_legacy),
|
|
.driver.name = KBUILD_MODNAME,
|
|
.driver.owner = THIS_MODULE,
|
|
.id_table = id_table,
|
|
.probe = virtblk_probe,
|
|
.remove = virtblk_remove,
|
|
.config_changed = virtblk_config_changed,
|
|
#ifdef CONFIG_PM_SLEEP
|
|
.freeze = virtblk_freeze,
|
|
.restore = virtblk_restore,
|
|
#endif
|
|
};
|
|
|
|
static int __init virtio_blk_init(void)
|
|
{
|
|
int error;
|
|
|
|
virtblk_wq = alloc_workqueue("virtio-blk", 0, 0);
|
|
if (!virtblk_wq)
|
|
return -ENOMEM;
|
|
|
|
major = register_blkdev(0, "virtblk");
|
|
if (major < 0) {
|
|
error = major;
|
|
goto out_destroy_workqueue;
|
|
}
|
|
|
|
error = register_virtio_driver(&virtio_blk);
|
|
if (error)
|
|
goto out_unregister_blkdev;
|
|
return 0;
|
|
|
|
out_unregister_blkdev:
|
|
unregister_blkdev(major, "virtblk");
|
|
out_destroy_workqueue:
|
|
destroy_workqueue(virtblk_wq);
|
|
return error;
|
|
}
|
|
|
|
static void __exit virtio_blk_fini(void)
|
|
{
|
|
unregister_virtio_driver(&virtio_blk);
|
|
unregister_blkdev(major, "virtblk");
|
|
destroy_workqueue(virtblk_wq);
|
|
}
|
|
module_init(virtio_blk_init);
|
|
module_exit(virtio_blk_fini);
|
|
|
|
MODULE_DEVICE_TABLE(virtio, id_table);
|
|
MODULE_DESCRIPTION("Virtio block driver");
|
|
MODULE_LICENSE("GPL");
|