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https://github.com/FEX-Emu/linux.git
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xen-blkfront: convert to blk-mq APIs
Note: This patch is based on original work of Arianna's internship for GNOME's Outreach Program for Women. Only one hardware queue is used now, so there is no significant performance change The legacy non-mq code is deleted completely which is the same as other drivers like virtio, mtip, and nvme. Also dropped one unnecessary holding of info->io_lock when calling blk_mq_stop_hw_queues(). Signed-off-by: Arianna Avanzini <avanzini.arianna@gmail.com> Signed-off-by: Bob Liu <bob.liu@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Jens Axboe <axboe@fb.com> Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Bob Liu
David Vrabel
parent
a7da51ae10
commit
907c3eb18e
@ -37,6 +37,7 @@
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#include <linux/interrupt.h>
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#include <linux/blkdev.h>
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#include <linux/blk-mq.h>
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#include <linux/hdreg.h>
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#include <linux/cdrom.h>
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#include <linux/module.h>
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@ -148,6 +149,7 @@ struct blkfront_info
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unsigned int feature_persistent:1;
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unsigned int max_indirect_segments;
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int is_ready;
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struct blk_mq_tag_set tag_set;
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};
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static unsigned int nr_minors;
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@ -617,54 +619,41 @@ static inline bool blkif_request_flush_invalid(struct request *req,
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!(info->feature_flush & REQ_FUA)));
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}
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/*
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* do_blkif_request
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* read a block; request is in a request queue
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*/
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static void do_blkif_request(struct request_queue *rq)
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static int blkif_queue_rq(struct blk_mq_hw_ctx *hctx,
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const struct blk_mq_queue_data *qd)
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{
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struct blkfront_info *info = NULL;
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struct request *req;
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int queued;
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struct blkfront_info *info = qd->rq->rq_disk->private_data;
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pr_debug("Entered do_blkif_request\n");
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blk_mq_start_request(qd->rq);
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spin_lock_irq(&info->io_lock);
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if (RING_FULL(&info->ring))
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goto out_busy;
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queued = 0;
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if (blkif_request_flush_invalid(qd->rq, info))
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goto out_err;
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while ((req = blk_peek_request(rq)) != NULL) {
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info = req->rq_disk->private_data;
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if (blkif_queue_request(qd->rq))
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goto out_busy;
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if (RING_FULL(&info->ring))
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goto wait;
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flush_requests(info);
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spin_unlock_irq(&info->io_lock);
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return BLK_MQ_RQ_QUEUE_OK;
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blk_start_request(req);
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out_err:
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spin_unlock_irq(&info->io_lock);
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return BLK_MQ_RQ_QUEUE_ERROR;
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if (blkif_request_flush_invalid(req, info)) {
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__blk_end_request_all(req, -EOPNOTSUPP);
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continue;
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}
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pr_debug("do_blk_req %p: cmd %p, sec %lx, "
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"(%u/%u) [%s]\n",
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req, req->cmd, (unsigned long)blk_rq_pos(req),
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blk_rq_cur_sectors(req), blk_rq_sectors(req),
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rq_data_dir(req) ? "write" : "read");
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if (blkif_queue_request(req)) {
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blk_requeue_request(rq, req);
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wait:
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/* Avoid pointless unplugs. */
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blk_stop_queue(rq);
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break;
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}
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queued++;
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}
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if (queued != 0)
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flush_requests(info);
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out_busy:
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spin_unlock_irq(&info->io_lock);
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blk_mq_stop_hw_queue(hctx);
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return BLK_MQ_RQ_QUEUE_BUSY;
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}
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static struct blk_mq_ops blkfront_mq_ops = {
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.queue_rq = blkif_queue_rq,
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.map_queue = blk_mq_map_queue,
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};
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static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size,
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unsigned int physical_sector_size,
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unsigned int segments)
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@ -672,9 +661,22 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size,
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struct request_queue *rq;
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struct blkfront_info *info = gd->private_data;
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rq = blk_init_queue(do_blkif_request, &info->io_lock);
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if (rq == NULL)
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memset(&info->tag_set, 0, sizeof(info->tag_set));
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info->tag_set.ops = &blkfront_mq_ops;
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info->tag_set.nr_hw_queues = 1;
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info->tag_set.queue_depth = BLK_RING_SIZE(info);
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info->tag_set.numa_node = NUMA_NO_NODE;
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info->tag_set.flags = BLK_MQ_F_SHOULD_MERGE | BLK_MQ_F_SG_MERGE;
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info->tag_set.cmd_size = 0;
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info->tag_set.driver_data = info;
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if (blk_mq_alloc_tag_set(&info->tag_set))
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return -1;
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rq = blk_mq_init_queue(&info->tag_set);
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if (IS_ERR(rq)) {
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blk_mq_free_tag_set(&info->tag_set);
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return -1;
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}
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queue_flag_set_unlocked(QUEUE_FLAG_VIRT, rq);
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@ -902,19 +904,15 @@ static int xlvbd_alloc_gendisk(blkif_sector_t capacity,
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static void xlvbd_release_gendisk(struct blkfront_info *info)
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{
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unsigned int minor, nr_minors;
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unsigned long flags;
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if (info->rq == NULL)
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return;
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spin_lock_irqsave(&info->io_lock, flags);
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/* No more blkif_request(). */
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blk_stop_queue(info->rq);
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blk_mq_stop_hw_queues(info->rq);
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/* No more gnttab callback work. */
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gnttab_cancel_free_callback(&info->callback);
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spin_unlock_irqrestore(&info->io_lock, flags);
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/* Flush gnttab callback work. Must be done with no locks held. */
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flush_work(&info->work);
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@ -926,20 +924,18 @@ static void xlvbd_release_gendisk(struct blkfront_info *info)
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xlbd_release_minors(minor, nr_minors);
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blk_cleanup_queue(info->rq);
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blk_mq_free_tag_set(&info->tag_set);
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info->rq = NULL;
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put_disk(info->gd);
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info->gd = NULL;
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}
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/* Must be called with io_lock holded */
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static void kick_pending_request_queues(struct blkfront_info *info)
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{
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if (!RING_FULL(&info->ring)) {
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/* Re-enable calldowns. */
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blk_start_queue(info->rq);
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/* Kick things off immediately. */
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do_blkif_request(info->rq);
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}
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if (!RING_FULL(&info->ring))
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blk_mq_start_stopped_hw_queues(info->rq, true);
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}
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static void blkif_restart_queue(struct work_struct *work)
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@ -964,7 +960,7 @@ static void blkif_free(struct blkfront_info *info, int suspend)
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BLKIF_STATE_SUSPENDED : BLKIF_STATE_DISCONNECTED;
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/* No more blkif_request(). */
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if (info->rq)
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blk_stop_queue(info->rq);
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blk_mq_stop_hw_queues(info->rq);
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/* Remove all persistent grants */
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if (!list_empty(&info->grants)) {
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@ -1147,7 +1143,6 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
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RING_IDX i, rp;
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unsigned long flags;
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struct blkfront_info *info = (struct blkfront_info *)dev_id;
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int error;
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spin_lock_irqsave(&info->io_lock, flags);
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@ -1188,37 +1183,37 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
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continue;
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}
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error = (bret->status == BLKIF_RSP_OKAY) ? 0 : -EIO;
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req->errors = (bret->status == BLKIF_RSP_OKAY) ? 0 : -EIO;
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switch (bret->operation) {
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case BLKIF_OP_DISCARD:
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if (unlikely(bret->status == BLKIF_RSP_EOPNOTSUPP)) {
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struct request_queue *rq = info->rq;
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printk(KERN_WARNING "blkfront: %s: %s op failed\n",
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info->gd->disk_name, op_name(bret->operation));
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error = -EOPNOTSUPP;
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req->errors = -EOPNOTSUPP;
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info->feature_discard = 0;
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info->feature_secdiscard = 0;
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queue_flag_clear(QUEUE_FLAG_DISCARD, rq);
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queue_flag_clear(QUEUE_FLAG_SECDISCARD, rq);
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}
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__blk_end_request_all(req, error);
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blk_mq_complete_request(req);
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break;
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case BLKIF_OP_FLUSH_DISKCACHE:
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case BLKIF_OP_WRITE_BARRIER:
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if (unlikely(bret->status == BLKIF_RSP_EOPNOTSUPP)) {
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printk(KERN_WARNING "blkfront: %s: %s op failed\n",
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info->gd->disk_name, op_name(bret->operation));
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error = -EOPNOTSUPP;
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req->errors = -EOPNOTSUPP;
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}
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if (unlikely(bret->status == BLKIF_RSP_ERROR &&
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info->shadow[id].req.u.rw.nr_segments == 0)) {
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printk(KERN_WARNING "blkfront: %s: empty %s op failed\n",
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info->gd->disk_name, op_name(bret->operation));
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error = -EOPNOTSUPP;
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req->errors = -EOPNOTSUPP;
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}
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if (unlikely(error)) {
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if (error == -EOPNOTSUPP)
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error = 0;
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if (unlikely(req->errors)) {
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if (req->errors == -EOPNOTSUPP)
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req->errors = 0;
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info->feature_flush = 0;
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xlvbd_flush(info);
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}
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@ -1229,7 +1224,7 @@ static irqreturn_t blkif_interrupt(int irq, void *dev_id)
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dev_dbg(&info->xbdev->dev, "Bad return from blkdev data "
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"request: %x\n", bret->status);
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__blk_end_request_all(req, error);
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blk_mq_complete_request(req);
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break;
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default:
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BUG();
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@ -1558,28 +1553,6 @@ static int blkif_recover(struct blkfront_info *info)
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kfree(copy);
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/*
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* Empty the queue, this is important because we might have
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* requests in the queue with more segments than what we
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* can handle now.
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*/
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spin_lock_irq(&info->io_lock);
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while ((req = blk_fetch_request(info->rq)) != NULL) {
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if (req->cmd_flags &
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(REQ_FLUSH | REQ_FUA | REQ_DISCARD | REQ_SECURE)) {
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list_add(&req->queuelist, &requests);
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continue;
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}
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merge_bio.head = req->bio;
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merge_bio.tail = req->biotail;
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bio_list_merge(&bio_list, &merge_bio);
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req->bio = NULL;
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if (req->cmd_flags & (REQ_FLUSH | REQ_FUA))
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pr_alert("diskcache flush request found!\n");
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__blk_end_request_all(req, 0);
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}
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spin_unlock_irq(&info->io_lock);
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xenbus_switch_state(info->xbdev, XenbusStateConnected);
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spin_lock_irq(&info->io_lock);
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@ -1594,9 +1567,10 @@ static int blkif_recover(struct blkfront_info *info)
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/* Requeue pending requests (flush or discard) */
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list_del_init(&req->queuelist);
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BUG_ON(req->nr_phys_segments > segs);
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blk_requeue_request(info->rq, req);
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blk_mq_requeue_request(req);
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}
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spin_unlock_irq(&info->io_lock);
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blk_mq_kick_requeue_list(info->rq);
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while ((bio = bio_list_pop(&bio_list)) != NULL) {
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/* Traverse the list of pending bios and re-queue them */
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