AuxXxilium/linux_dsm_epyc7002
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Merge branch 'stable/for-jens-4.8-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen into for-linus

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Konrad writes:

Please git pull the following three fixes in to your 'for-linus' branch.
It is against 'for-linus' instead of 'for-4.8/drivers' because we had
some code in xen-blkfront go through the Xen tree (with your Ack). The
reason was that you 'for-4.8/drivers' was based on 4.7-rc2, and the
fixes needed to be against newer tag.

This branch fixes as we are exercising the multiqueue components more
aggressively.
This commit is contained in:
Jens Axboe 2016-08-19 10:51:15 -06:00
commit c9d8fa6d30
1 changed files with 56 additions and 41 deletions
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97
drivers/block/xen-blkfront.c
View File

@ -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 @@ static void blkif_free_ring(struct blkfront_ring_info *rinfo)
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;
}
/**