diff options
Diffstat (limited to 'drivers/block/xen-blkfront.c')
| -rw-r--r-- | drivers/block/xen-blkfront.c | 97 |
1 files changed, 56 insertions, 41 deletions
diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index be4fea6..88ef6d4 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -189,6 +189,8 @@ struct blkfront_info struct mutex mutex; struct xenbus_device *xbdev; struct gendisk *gd; + u16 sector_size; + unsigned int physical_sector_size; int vdevice; blkif_vdev_t handle; enum blkif_state connected; @@ -910,9 +912,45 @@ static struct blk_mq_ops blkfront_mq_ops = { .map_queue = blk_mq_map_queue, }; +static void blkif_set_queue_limits(struct blkfront_info *info) +{ + struct request_queue *rq = info->rq; + struct gendisk *gd = info->gd; + unsigned int segments = info->max_indirect_segments ? : + BLKIF_MAX_SEGMENTS_PER_REQUEST; + + queue_flag_set_unlocked(QUEUE_FLAG_VIRT, rq); + + if (info->feature_discard) { + queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, rq); + blk_queue_max_discard_sectors(rq, get_capacity(gd)); + rq->limits.discard_granularity = info->discard_granularity; + rq->limits.discard_alignment = info->discard_alignment; + if (info->feature_secdiscard) + queue_flag_set_unlocked(QUEUE_FLAG_SECERASE, rq); + } + + /* Hard sector size and max sectors impersonate the equiv. hardware. */ + blk_queue_logical_block_size(rq, info->sector_size); + blk_queue_physical_block_size(rq, info->physical_sector_size); + blk_queue_max_hw_sectors(rq, (segments * XEN_PAGE_SIZE) / 512); + + /* Each segment in a request is up to an aligned page in size. */ + blk_queue_segment_boundary(rq, PAGE_SIZE - 1); + blk_queue_max_segment_size(rq, PAGE_SIZE); + + /* Ensure a merged request will fit in a single I/O ring slot. */ + blk_queue_max_segments(rq, segments / GRANTS_PER_PSEG); + + /* Make sure buffer addresses are sector-aligned. */ + blk_queue_dma_alignment(rq, 511); + + /* Make sure we don't use bounce buffers. */ + blk_queue_bounce_limit(rq, BLK_BOUNCE_ANY); +} + static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size, - unsigned int physical_sector_size, - unsigned int segments) + unsigned int physical_sector_size) { struct request_queue *rq; struct blkfront_info *info = gd->private_data; @@ -944,36 +982,11 @@ static int xlvbd_init_blk_queue(struct gendisk *gd, u16 sector_size, } rq->queuedata = info; - queue_flag_set_unlocked(QUEUE_FLAG_VIRT, rq); - - if (info->feature_discard) { - queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, rq); - blk_queue_max_discard_sectors(rq, get_capacity(gd)); - rq->limits.discard_granularity = info->discard_granularity; - rq->limits.discard_alignment = info->discard_alignment; - if (info->feature_secdiscard) - queue_flag_set_unlocked(QUEUE_FLAG_SECERASE, rq); - } - - /* Hard sector size and max sectors impersonate the equiv. hardware. */ - blk_queue_logical_block_size(rq, sector_size); - blk_queue_physical_block_size(rq, physical_sector_size); - blk_queue_max_hw_sectors(rq, (segments * XEN_PAGE_SIZE) / 512); - - /* Each segment in a request is up to an aligned page in size. */ - blk_queue_segment_boundary(rq, PAGE_SIZE - 1); - blk_queue_max_segment_size(rq, PAGE_SIZE); - - /* Ensure a merged request will fit in a single I/O ring slot. */ - blk_queue_max_segments(rq, segments / GRANTS_PER_PSEG); - - /* Make sure buffer addresses are sector-aligned. */ - blk_queue_dma_alignment(rq, 511); - - /* Make sure we don't use bounce buffers. */ - blk_queue_bounce_limit(rq, BLK_BOUNCE_ANY); - - gd->queue = rq; + info->rq = gd->queue = rq; + info->gd = gd; + info->sector_size = sector_size; + info->physical_sector_size = physical_sector_size; + blkif_set_queue_limits(info); return 0; } @@ -1136,16 +1149,11 @@ static int xlvbd_alloc_gendisk(blkif_sector_t capacity, gd->private_data = info; set_capacity(gd, capacity); - if (xlvbd_init_blk_queue(gd, sector_size, physical_sector_size, - info->max_indirect_segments ? : - BLKIF_MAX_SEGMENTS_PER_REQUEST)) { + if (xlvbd_init_blk_queue(gd, sector_size, physical_sector_size)) { del_gendisk(gd); goto release; } - info->rq = gd->queue; - info->gd = gd; - xlvbd_flush(info); if (vdisk_info & VDISK_READONLY) @@ -1315,7 +1323,7 @@ free_shadow: rinfo->ring_ref[i] = GRANT_INVALID_REF; } } - free_pages((unsigned long)rinfo->ring.sring, get_order(info->nr_ring_pages * PAGE_SIZE)); + free_pages((unsigned long)rinfo->ring.sring, get_order(info->nr_ring_pages * XEN_PAGE_SIZE)); rinfo->ring.sring = NULL; if (rinfo->irq) @@ -2007,8 +2015,10 @@ static int blkif_recover(struct blkfront_info *info) struct split_bio *split_bio; blkfront_gather_backend_features(info); + /* Reset limits changed by blk_mq_update_nr_hw_queues(). */ + blkif_set_queue_limits(info); segs = info->max_indirect_segments ? : BLKIF_MAX_SEGMENTS_PER_REQUEST; - blk_queue_max_segments(info->rq, segs); + blk_queue_max_segments(info->rq, segs / GRANTS_PER_PSEG); for (r_index = 0; r_index < info->nr_rings; r_index++) { struct blkfront_ring_info *rinfo = &info->rinfo[r_index]; @@ -2432,7 +2442,7 @@ static void blkfront_connect(struct blkfront_info *info) if (err) { xenbus_dev_fatal(info->xbdev, err, "xlvbd_add at %s", info->xbdev->otherend); - return; + goto fail; } xenbus_switch_state(info->xbdev, XenbusStateConnected); @@ -2445,6 +2455,11 @@ static void blkfront_connect(struct blkfront_info *info) device_add_disk(&info->xbdev->dev, info->gd); info->is_ready = 1; + return; + +fail: + blkif_free(info, 0); + return; } /** |