^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) //#define DEBUG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) #include <linux/blkdev.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) #include <linux/hdreg.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) #include <linux/interrupt.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/virtio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #include <linux/virtio_blk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/scatterlist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/string_helpers.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/idr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/blk-mq.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/blk-mq-virtio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/numa.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <uapi/linux/virtio_ring.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define PART_BITS 4
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define VQ_NAME_LEN 16
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define MAX_DISCARD_SEGMENTS 256u
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) static int major;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static DEFINE_IDA(vd_index_ida);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) static struct workqueue_struct *virtblk_wq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) struct virtio_blk_vq {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) struct virtqueue *vq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) char name[VQ_NAME_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) } ____cacheline_aligned_in_smp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct virtio_blk {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) * This mutex must be held by anything that may run after
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) * virtblk_remove() sets vblk->vdev to NULL.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) * blk-mq, virtqueue processing, and sysfs attribute code paths are
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) * shut down before vblk->vdev is set to NULL and therefore do not need
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) * to hold this mutex.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) struct mutex vdev_mutex;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct virtio_device *vdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) /* The disk structure for the kernel. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) struct gendisk *disk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /* Block layer tags. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) struct blk_mq_tag_set tag_set;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /* Process context for config space updates */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) struct work_struct config_work;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * Tracks references from block_device_operations open/release and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * virtio_driver probe/remove so this object can be freed once no
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * longer in use.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) refcount_t refs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) /* What host tells us, plus 2 for header & tailer. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) unsigned int sg_elems;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) /* Ida index - used to track minor number allocations. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) /* num of vqs */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) int num_vqs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) struct virtio_blk_vq *vqs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct virtblk_req {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) struct virtio_blk_outhdr out_hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) u8 status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct scatterlist sg[];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static inline blk_status_t virtblk_result(struct virtblk_req *vbr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) switch (vbr->status) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) case VIRTIO_BLK_S_OK:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return BLK_STS_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) case VIRTIO_BLK_S_UNSUPP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return BLK_STS_NOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) return BLK_STS_IOERR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) static int virtblk_add_req(struct virtqueue *vq, struct virtblk_req *vbr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) struct scatterlist *data_sg, bool have_data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) struct scatterlist hdr, status, *sgs[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) unsigned int num_out = 0, num_in = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) sg_init_one(&hdr, &vbr->out_hdr, sizeof(vbr->out_hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) sgs[num_out++] = &hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (have_data) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) if (vbr->out_hdr.type & cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) sgs[num_out++] = data_sg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) sgs[num_out + num_in++] = data_sg;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) sg_init_one(&status, &vbr->status, sizeof(vbr->status));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) sgs[num_out + num_in++] = &status;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) static int virtblk_setup_discard_write_zeroes(struct request *req, bool unmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) unsigned short segments = blk_rq_nr_discard_segments(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) unsigned short n = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) struct virtio_blk_discard_write_zeroes *range;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) struct bio *bio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) u32 flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) if (unmap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) flags |= VIRTIO_BLK_WRITE_ZEROES_FLAG_UNMAP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) range = kmalloc_array(segments, sizeof(*range), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (!range)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) * Single max discard segment means multi-range discard isn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) * supported, and block layer only runs contiguity merge like
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) * normal RW request. So we can't reply on bio for retrieving
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) * each range info.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) if (queue_max_discard_segments(req->q) == 1) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) range[0].flags = cpu_to_le32(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) range[0].num_sectors = cpu_to_le32(blk_rq_sectors(req));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) range[0].sector = cpu_to_le64(blk_rq_pos(req));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) n = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) __rq_for_each_bio(bio, req) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) u64 sector = bio->bi_iter.bi_sector;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) u32 num_sectors = bio->bi_iter.bi_size >> SECTOR_SHIFT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) range[n].flags = cpu_to_le32(flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) range[n].num_sectors = cpu_to_le32(num_sectors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) range[n].sector = cpu_to_le64(sector);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) n++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) WARN_ON_ONCE(n != segments);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) req->special_vec.bv_page = virt_to_page(range);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) req->special_vec.bv_offset = offset_in_page(range);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) req->special_vec.bv_len = sizeof(*range) * segments;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) req->rq_flags |= RQF_SPECIAL_PAYLOAD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) static inline void virtblk_request_done(struct request *req)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) if (req->rq_flags & RQF_SPECIAL_PAYLOAD) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) kfree(page_address(req->special_vec.bv_page) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) req->special_vec.bv_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) blk_mq_end_request(req, virtblk_result(vbr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) static void virtblk_done(struct virtqueue *vq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) struct virtio_blk *vblk = vq->vdev->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) bool req_done = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) int qid = vq->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) struct virtblk_req *vbr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) unsigned int len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) virtqueue_disable_cb(vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) while ((vbr = virtqueue_get_buf(vblk->vqs[qid].vq, &len)) != NULL) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) struct request *req = blk_mq_rq_from_pdu(vbr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) if (likely(!blk_should_fake_timeout(req->q)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) blk_mq_complete_request(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) req_done = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) if (unlikely(virtqueue_is_broken(vq)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) } while (!virtqueue_enable_cb(vq));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) /* In case queue is stopped waiting for more buffers. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) if (req_done)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) static void virtio_commit_rqs(struct blk_mq_hw_ctx *hctx)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) struct virtio_blk *vblk = hctx->queue->queuedata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) struct virtio_blk_vq *vq = &vblk->vqs[hctx->queue_num];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) bool kick;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) spin_lock_irq(&vq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) kick = virtqueue_kick_prepare(vq->vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) spin_unlock_irq(&vq->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) if (kick)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) virtqueue_notify(vq->vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) static blk_status_t virtio_queue_rq(struct blk_mq_hw_ctx *hctx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) const struct blk_mq_queue_data *bd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) struct virtio_blk *vblk = hctx->queue->queuedata;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) struct request *req = bd->rq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) unsigned long flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) unsigned int num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) int qid = hctx->queue_num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) bool notify = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) bool unmap = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) u32 type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) switch (req_op(req)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) case REQ_OP_READ:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) case REQ_OP_WRITE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) type = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) case REQ_OP_FLUSH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) type = VIRTIO_BLK_T_FLUSH;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) case REQ_OP_DISCARD:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) type = VIRTIO_BLK_T_DISCARD;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) case REQ_OP_WRITE_ZEROES:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) type = VIRTIO_BLK_T_WRITE_ZEROES;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) unmap = !(req->cmd_flags & REQ_NOUNMAP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) case REQ_OP_DRV_IN:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) type = VIRTIO_BLK_T_GET_ID;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) WARN_ON_ONCE(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) return BLK_STS_IOERR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) BUG_ON(type != VIRTIO_BLK_T_DISCARD &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) type != VIRTIO_BLK_T_WRITE_ZEROES &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) (req->nr_phys_segments + 2 > vblk->sg_elems));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) vbr->out_hdr.sector = type ?
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 0 : cpu_to_virtio64(vblk->vdev, blk_rq_pos(req));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(req));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) blk_mq_start_request(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) if (type == VIRTIO_BLK_T_DISCARD || type == VIRTIO_BLK_T_WRITE_ZEROES) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) err = virtblk_setup_discard_write_zeroes(req, unmap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) return BLK_STS_RESOURCE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) num = blk_rq_map_sg(hctx->queue, req, vbr->sg);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) if (num) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) if (rq_data_dir(req) == WRITE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_OUT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_IN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) err = virtblk_add_req(vblk->vqs[qid].vq, vbr, vbr->sg, num);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) virtqueue_kick(vblk->vqs[qid].vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) /* Don't stop the queue if -ENOMEM: we may have failed to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) * bounce the buffer due to global resource outage.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) if (err == -ENOSPC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) blk_mq_stop_hw_queue(hctx);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) switch (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) case -ENOSPC:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) return BLK_STS_DEV_RESOURCE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) case -ENOMEM:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) return BLK_STS_RESOURCE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) return BLK_STS_IOERR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) if (bd->last && virtqueue_kick_prepare(vblk->vqs[qid].vq))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) notify = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) if (notify)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) virtqueue_notify(vblk->vqs[qid].vq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) return BLK_STS_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) /* return id (s/n) string for *disk to *id_str
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) static int virtblk_get_id(struct gendisk *disk, char *id_str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) struct virtio_blk *vblk = disk->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) struct request_queue *q = vblk->disk->queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) struct request *req;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) req = blk_get_request(q, REQ_OP_DRV_IN, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) if (IS_ERR(req))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) return PTR_ERR(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) err = blk_rq_map_kern(q, req, id_str, VIRTIO_BLK_ID_BYTES, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) blk_execute_rq(vblk->disk->queue, vblk->disk, req, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) err = blk_status_to_errno(virtblk_result(blk_mq_rq_to_pdu(req)));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) blk_put_request(req);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) static void virtblk_get(struct virtio_blk *vblk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) refcount_inc(&vblk->refs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) static void virtblk_put(struct virtio_blk *vblk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) if (refcount_dec_and_test(&vblk->refs)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) ida_simple_remove(&vd_index_ida, vblk->index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) mutex_destroy(&vblk->vdev_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) kfree(vblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) static int virtblk_open(struct block_device *bd, fmode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) struct virtio_blk *vblk = bd->bd_disk->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) mutex_lock(&vblk->vdev_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) if (vblk->vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) virtblk_get(vblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) ret = -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) mutex_unlock(&vblk->vdev_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) static void virtblk_release(struct gendisk *disk, fmode_t mode)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) struct virtio_blk *vblk = disk->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) virtblk_put(vblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) /* We provide getgeo only to please some old bootloader/partitioning tools */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) struct virtio_blk *vblk = bd->bd_disk->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) mutex_lock(&vblk->vdev_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) if (!vblk->vdev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) ret = -ENXIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) /* see if the host passed in geometry config */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) if (virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_GEOMETRY)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) virtio_cread(vblk->vdev, struct virtio_blk_config,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) geometry.cylinders, &geo->cylinders);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) virtio_cread(vblk->vdev, struct virtio_blk_config,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) geometry.heads, &geo->heads);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) virtio_cread(vblk->vdev, struct virtio_blk_config,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) geometry.sectors, &geo->sectors);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) /* some standard values, similar to sd */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) geo->heads = 1 << 6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) geo->sectors = 1 << 5;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) geo->cylinders = get_capacity(bd->bd_disk) >> 11;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) mutex_unlock(&vblk->vdev_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) static const struct block_device_operations virtblk_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) .owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) .open = virtblk_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) .release = virtblk_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) .getgeo = virtblk_getgeo,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) static int index_to_minor(int index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) return index << PART_BITS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) static int minor_to_index(int minor)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) return minor >> PART_BITS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) static ssize_t serial_show(struct device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419) struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) struct gendisk *disk = dev_to_disk(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) /* sysfs gives us a PAGE_SIZE buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427) buf[VIRTIO_BLK_ID_BYTES] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) err = virtblk_get_id(disk, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) return strlen(buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432) if (err == -EIO) /* Unsupported? Make it empty. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438) static DEVICE_ATTR_RO(serial);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) /* The queue's logical block size must be set before calling this */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) static void virtblk_update_capacity(struct virtio_blk *vblk, bool resize)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443) struct virtio_device *vdev = vblk->vdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) struct request_queue *q = vblk->disk->queue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) char cap_str_2[10], cap_str_10[10];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) unsigned long long nblocks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) u64 capacity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449) /* Host must always specify the capacity. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) virtio_cread(vdev, struct virtio_blk_config, capacity, &capacity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) /* If capacity is too big, truncate with warning. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) if ((sector_t)capacity != capacity) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455) (unsigned long long)capacity);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) capacity = (sector_t)-1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) nblocks = DIV_ROUND_UP_ULL(capacity, queue_logical_block_size(q) >> 9);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) string_get_size(nblocks, queue_logical_block_size(q),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) string_get_size(nblocks, queue_logical_block_size(q),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) dev_notice(&vdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) "[%s] %s%llu %d-byte logical blocks (%s/%s)\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468) vblk->disk->disk_name,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) resize ? "new size: " : "",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) nblocks,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) queue_logical_block_size(q),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) cap_str_10,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473) cap_str_2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) set_capacity_revalidate_and_notify(vblk->disk, capacity, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) static void virtblk_config_changed_work(struct work_struct *work)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) struct virtio_blk *vblk =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) container_of(work, struct virtio_blk, config_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483) virtblk_update_capacity(vblk, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) static void virtblk_config_changed(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) struct virtio_blk *vblk = vdev->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) queue_work(virtblk_wq, &vblk->config_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493) static int init_vq(struct virtio_blk *vblk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) vq_callback_t **callbacks;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) const char **names;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499) struct virtqueue **vqs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) unsigned short num_vqs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) struct virtio_device *vdev = vblk->vdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) struct irq_affinity desc = { 0, };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) err = virtio_cread_feature(vdev, VIRTIO_BLK_F_MQ,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505) struct virtio_blk_config, num_queues,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) &num_vqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) num_vqs = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510) num_vqs = min_t(unsigned int, nr_cpu_ids, num_vqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) vblk->vqs = kmalloc_array(num_vqs, sizeof(*vblk->vqs), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) if (!vblk->vqs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) names = kmalloc_array(num_vqs, sizeof(*names), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517) callbacks = kmalloc_array(num_vqs, sizeof(*callbacks), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) vqs = kmalloc_array(num_vqs, sizeof(*vqs), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) if (!names || !callbacks || !vqs) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) for (i = 0; i < num_vqs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) callbacks[i] = virtblk_done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req.%d", i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) names[i] = vblk->vqs[i].name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) /* Discover virtqueues and write information to configuration. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) err = virtio_find_vqs(vdev, num_vqs, vqs, callbacks, names, &desc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) for (i = 0; i < num_vqs; i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) spin_lock_init(&vblk->vqs[i].lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) vblk->vqs[i].vq = vqs[i];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) vblk->num_vqs = num_vqs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) kfree(vqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) kfree(callbacks);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544) kfree(names);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) kfree(vblk->vqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) * Legacy naming scheme used for virtio devices. We are stuck with it for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) * virtio blk but don't ever use it for any new driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) static int virtblk_name_format(char *prefix, int index, char *buf, int buflen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) const int base = 'z' - 'a' + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) char *begin = buf + strlen(prefix);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) char *end = buf + buflen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) char *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) int unit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) p = end - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) *p = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564) unit = base;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) if (p == begin)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568) *--p = 'a' + (index % unit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) index = (index / unit) - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) } while (index >= 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572) memmove(begin, p, end - p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) memcpy(buf, prefix, strlen(prefix));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) static int virtblk_get_cache_mode(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) u8 writeback;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) err = virtio_cread_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) struct virtio_blk_config, wce,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) &writeback);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) * If WCE is not configurable and flush is not available,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589) * assume no writeback cache is in use.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594) return writeback;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) static void virtblk_update_cache_mode(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599) u8 writeback = virtblk_get_cache_mode(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) struct virtio_blk *vblk = vdev->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) blk_queue_write_cache(vblk->disk->queue, writeback, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) revalidate_disk_size(vblk->disk, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) static const char *const virtblk_cache_types[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) "write through", "write back"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) cache_type_store(struct device *dev, struct device_attribute *attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) const char *buf, size_t count)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) struct gendisk *disk = dev_to_disk(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) struct virtio_blk *vblk = disk->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) struct virtio_device *vdev = vblk->vdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) BUG_ON(!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_CONFIG_WCE));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) i = sysfs_match_string(virtblk_cache_types, buf);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) if (i < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) return i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) virtio_cwrite8(vdev, offsetof(struct virtio_blk_config, wce), i);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625) virtblk_update_cache_mode(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) static ssize_t
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) struct gendisk *disk = dev_to_disk(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633) struct virtio_blk *vblk = disk->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) u8 writeback = virtblk_get_cache_mode(vblk->vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) BUG_ON(writeback >= ARRAY_SIZE(virtblk_cache_types));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637) return snprintf(buf, 40, "%s\n", virtblk_cache_types[writeback]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) static DEVICE_ATTR_RW(cache_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) static struct attribute *virtblk_attrs[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) &dev_attr_serial.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644) &dev_attr_cache_type.attr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) static umode_t virtblk_attrs_are_visible(struct kobject *kobj,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) struct attribute *a, int n)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) struct device *dev = kobj_to_dev(kobj);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652) struct gendisk *disk = dev_to_disk(dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) struct virtio_blk *vblk = disk->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) struct virtio_device *vdev = vblk->vdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) if (a == &dev_attr_cache_type.attr &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657) !virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) return S_IRUGO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) return a->mode;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) static const struct attribute_group virtblk_attr_group = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664) .attrs = virtblk_attrs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) .is_visible = virtblk_attrs_are_visible,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) static const struct attribute_group *virtblk_attr_groups[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) &virtblk_attr_group,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670) NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) static int virtblk_init_request(struct blk_mq_tag_set *set, struct request *rq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) unsigned int hctx_idx, unsigned int numa_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) struct virtio_blk *vblk = set->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) struct virtblk_req *vbr = blk_mq_rq_to_pdu(rq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) sg_init_table(vbr->sg, vblk->sg_elems);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) static int virtblk_map_queues(struct blk_mq_tag_set *set)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) struct virtio_blk *vblk = set->driver_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) return blk_mq_virtio_map_queues(&set->map[HCTX_TYPE_DEFAULT],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) vblk->vdev, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) static const struct blk_mq_ops virtio_mq_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) .queue_rq = virtio_queue_rq,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) .commit_rqs = virtio_commit_rqs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) .complete = virtblk_request_done,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) .init_request = virtblk_init_request,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696) .map_queues = virtblk_map_queues,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) static unsigned int virtblk_queue_depth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) module_param_named(queue_depth, virtblk_queue_depth, uint, 0444);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) static int virtblk_probe(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) struct virtio_blk *vblk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) struct request_queue *q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706) int err, index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) u32 v, blk_size, max_size, sg_elems, opt_io_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) u16 min_io_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710) u8 physical_block_exp, alignment_offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712) if (!vdev->config->get) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) dev_err(&vdev->dev, "%s failure: config access disabled\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) err = ida_simple_get(&vd_index_ida, 0, minor_to_index(1 << MINORBITS),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) index = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) /* We need to know how many segments before we allocate. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SEG_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) struct virtio_blk_config, seg_max,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727) &sg_elems);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) /* We need at least one SG element, whatever they say. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) if (err || !sg_elems)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) sg_elems = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) /* We need an extra sg elements at head and tail. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) sg_elems += 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) vdev->priv = vblk = kmalloc(sizeof(*vblk), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) if (!vblk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738) goto out_free_index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) /* This reference is dropped in virtblk_remove(). */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742) refcount_set(&vblk->refs, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) mutex_init(&vblk->vdev_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) vblk->vdev = vdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) vblk->sg_elems = sg_elems;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) INIT_WORK(&vblk->config_work, virtblk_config_changed_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) err = init_vq(vblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) goto out_free_vblk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754) /* FIXME: How many partitions? How long is a piece of string? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) vblk->disk = alloc_disk(1 << PART_BITS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) if (!vblk->disk) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) goto out_free_vq;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) /* Default queue sizing is to fill the ring. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) if (!virtblk_queue_depth) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) virtblk_queue_depth = vblk->vqs[0].vq->num_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) /* ... but without indirect descs, we use 2 descs per req */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765) if (!virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) virtblk_queue_depth /= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769) memset(&vblk->tag_set, 0, sizeof(vblk->tag_set));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) vblk->tag_set.ops = &virtio_mq_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) vblk->tag_set.queue_depth = virtblk_queue_depth;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) vblk->tag_set.numa_node = NUMA_NO_NODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773) vblk->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) vblk->tag_set.cmd_size =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) sizeof(struct virtblk_req) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776) sizeof(struct scatterlist) * sg_elems;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) vblk->tag_set.driver_data = vblk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) vblk->tag_set.nr_hw_queues = vblk->num_vqs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) err = blk_mq_alloc_tag_set(&vblk->tag_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781) if (err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) goto out_put_disk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) q = blk_mq_init_queue(&vblk->tag_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) if (IS_ERR(q)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787) goto out_free_tags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 789) vblk->disk->queue = q;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 790)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 791) q->queuedata = vblk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 792)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 793) virtblk_name_format("vd", index, vblk->disk->disk_name, DISK_NAME_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 794)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 795) vblk->disk->major = major;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 796) vblk->disk->first_minor = index_to_minor(index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 797) vblk->disk->private_data = vblk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 798) vblk->disk->fops = &virtblk_fops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 799) vblk->disk->flags |= GENHD_FL_EXT_DEVT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 800) vblk->index = index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 801)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 802) /* configure queue flush support */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 803) virtblk_update_cache_mode(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 804)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 805) /* If disk is read-only in the host, the guest should obey */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 806) if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 807) set_disk_ro(vblk->disk, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 808)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 809) /* We can handle whatever the host told us to handle. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 810) blk_queue_max_segments(q, vblk->sg_elems-2);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 811)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 812) /* No real sector limit. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 813) blk_queue_max_hw_sectors(q, -1U);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 814)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 815) max_size = virtio_max_dma_size(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 816)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 817) /* Host can optionally specify maximum segment size and number of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 818) * segments. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 819) err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SIZE_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 820) struct virtio_blk_config, size_max, &v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 821) if (!err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 822) max_size = min(max_size, v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 823)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 824) blk_queue_max_segment_size(q, max_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 825)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 826) /* Host can optionally specify the block size of the device */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 827) err = virtio_cread_feature(vdev, VIRTIO_BLK_F_BLK_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 828) struct virtio_blk_config, blk_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 829) &blk_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 830) if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 831) err = blk_validate_block_size(blk_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 832) if (err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 833) dev_err(&vdev->dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 834) "virtio_blk: invalid block size: 0x%x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 835) blk_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 836) goto out_cleanup_disk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 837) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 838)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 839) blk_queue_logical_block_size(q, blk_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 840) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 841) blk_size = queue_logical_block_size(q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 842)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 843) /* Use topology information if available */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 844) err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 845) struct virtio_blk_config, physical_block_exp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 846) &physical_block_exp);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 847) if (!err && physical_block_exp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 848) blk_queue_physical_block_size(q,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 849) blk_size * (1 << physical_block_exp));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 850)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 851) err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 852) struct virtio_blk_config, alignment_offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 853) &alignment_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 854) if (!err && alignment_offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 855) blk_queue_alignment_offset(q, blk_size * alignment_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 856)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 857) err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 858) struct virtio_blk_config, min_io_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 859) &min_io_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 860) if (!err && min_io_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 861) blk_queue_io_min(q, blk_size * min_io_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 862)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 863) err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 864) struct virtio_blk_config, opt_io_size,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 865) &opt_io_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 866) if (!err && opt_io_size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 867) blk_queue_io_opt(q, blk_size * opt_io_size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 868)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 869) if (virtio_has_feature(vdev, VIRTIO_BLK_F_DISCARD)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 870) q->limits.discard_granularity = blk_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 871)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 872) virtio_cread(vdev, struct virtio_blk_config,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 873) discard_sector_alignment, &v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 874) q->limits.discard_alignment = v ? v << SECTOR_SHIFT : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 875)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 876) virtio_cread(vdev, struct virtio_blk_config,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 877) max_discard_sectors, &v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 878) blk_queue_max_discard_sectors(q, v ? v : UINT_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 879)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 880) virtio_cread(vdev, struct virtio_blk_config, max_discard_seg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 881) &v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 882)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 883) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 884) * max_discard_seg == 0 is out of spec but we always
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 885) * handled it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 886) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 887) if (!v)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 888) v = sg_elems - 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 889) blk_queue_max_discard_segments(q,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 890) min(v, MAX_DISCARD_SEGMENTS));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 891)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 892) blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 893) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 894)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 895) if (virtio_has_feature(vdev, VIRTIO_BLK_F_WRITE_ZEROES)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 896) virtio_cread(vdev, struct virtio_blk_config,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 897) max_write_zeroes_sectors, &v);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 898) blk_queue_max_write_zeroes_sectors(q, v ? v : UINT_MAX);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 899) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 900)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 901) virtblk_update_capacity(vblk, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 902) virtio_device_ready(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 903)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 904) device_add_disk(&vdev->dev, vblk->disk, virtblk_attr_groups);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 905) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 906)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 907) out_cleanup_disk:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 908) blk_cleanup_queue(vblk->disk->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 909) out_free_tags:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 910) blk_mq_free_tag_set(&vblk->tag_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 911) out_put_disk:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 912) put_disk(vblk->disk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 913) out_free_vq:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 914) vdev->config->del_vqs(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 915) kfree(vblk->vqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 916) out_free_vblk:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 917) kfree(vblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 918) out_free_index:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 919) ida_simple_remove(&vd_index_ida, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 920) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 921) return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 922) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 923)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 924) static void virtblk_remove(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 925) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 926) struct virtio_blk *vblk = vdev->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 927)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 928) /* Make sure no work handler is accessing the device. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 929) flush_work(&vblk->config_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 930)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 931) del_gendisk(vblk->disk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 932) blk_cleanup_queue(vblk->disk->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 933)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 934) blk_mq_free_tag_set(&vblk->tag_set);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 935)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 936) mutex_lock(&vblk->vdev_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 937)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 938) /* Stop all the virtqueues. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 939) vdev->config->reset(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 940)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 941) /* Virtqueues are stopped, nothing can use vblk->vdev anymore. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 942) vblk->vdev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 943)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 944) put_disk(vblk->disk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 945) vdev->config->del_vqs(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 946) kfree(vblk->vqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 947)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 948) mutex_unlock(&vblk->vdev_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 949)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 950) virtblk_put(vblk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 951) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 952)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 953) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 954) static int virtblk_freeze(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 955) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 956) struct virtio_blk *vblk = vdev->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 957)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 958) /* Ensure we don't receive any more interrupts */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 959) vdev->config->reset(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 960)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 961) /* Make sure no work handler is accessing the device. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 962) flush_work(&vblk->config_work);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 963)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 964) blk_mq_quiesce_queue(vblk->disk->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 965)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 966) vdev->config->del_vqs(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 967) kfree(vblk->vqs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 968)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 969) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 970) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 971)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 972) static int virtblk_restore(struct virtio_device *vdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 973) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 974) struct virtio_blk *vblk = vdev->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 975) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 976)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 977) ret = init_vq(vdev->priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 978) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 979) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 980)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 981) virtio_device_ready(vdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 982)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 983) blk_mq_unquiesce_queue(vblk->disk->queue);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 984) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 985) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 986) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 987)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 988) static const struct virtio_device_id id_table[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 989) { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 990) { 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 991) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 992)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 993) static unsigned int features_legacy[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 994) VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 995) VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 996) VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 997) VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 998) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 999) ;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1000) static unsigned int features[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1001) VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1002) VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1003) VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1004) VIRTIO_BLK_F_MQ, VIRTIO_BLK_F_DISCARD, VIRTIO_BLK_F_WRITE_ZEROES,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1005) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1006)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1007) static struct virtio_driver virtio_blk = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1008) .feature_table = features,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1009) .feature_table_size = ARRAY_SIZE(features),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1010) .feature_table_legacy = features_legacy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1011) .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1012) .driver.name = KBUILD_MODNAME,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1013) .driver.owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1014) .id_table = id_table,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1015) .probe = virtblk_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1016) .remove = virtblk_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1017) .config_changed = virtblk_config_changed,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1018) #ifdef CONFIG_PM_SLEEP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1019) .freeze = virtblk_freeze,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1020) .restore = virtblk_restore,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1021) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1022) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1023)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1024) static int __init init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1025) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1026) int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1027)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1028) virtblk_wq = alloc_workqueue("virtio-blk", 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1029) if (!virtblk_wq)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1030) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1031)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1032) major = register_blkdev(0, "virtblk");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1033) if (major < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1034) error = major;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1035) goto out_destroy_workqueue;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1036) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1037)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1038) error = register_virtio_driver(&virtio_blk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1039) if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1040) goto out_unregister_blkdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1041) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1042)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1043) out_unregister_blkdev:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1044) unregister_blkdev(major, "virtblk");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1045) out_destroy_workqueue:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1046) destroy_workqueue(virtblk_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1047) return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1048) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1049)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1050) static void __exit fini(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1051) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1052) unregister_virtio_driver(&virtio_blk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1053) unregister_blkdev(major, "virtblk");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1054) destroy_workqueue(virtblk_wq);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1055) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1056) module_init(init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1057) module_exit(fini);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1058)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1059) MODULE_DEVICE_TABLE(virtio, id_table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1060) MODULE_DESCRIPTION("Virtio block driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1061) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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