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authorBart Van Assche <bart.vanassche@wdc.com>2018-02-27 16:32:14 -0800
committerJens Axboe <axboe@kernel.dk>2018-02-28 12:23:35 -0700
commit18bc42308699522b57fd599401c03ad561f422ef (patch)
treef83eb2e88c180612a859e0e36be78cf0afaff78b /block
parent1209cb7fa4afcd7f652a70e1d2028686ec28a7a5 (diff)
downloadlinux-stericsson-18bc42308699522b57fd599401c03ad561f422ef.tar.gz
blk-mq-debugfs: Show zone locking information
When debugging the ZBC code in the mq-deadline scheduler it is very important to know which zones are locked and which zones are not locked. Hence this patch that exports the zone locking information through debugfs. Cc: Omar Sandoval <osandov@fb.com> Cc: Ming Lei <ming.lei@redhat.com> Cc: Hannes Reinecke <hare@suse.de> Cc: Johannes Thumshirn <jthumshirn@suse.de> Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com> Tested-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq-debugfs.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 9547569aa619..bd21d5b9f65f 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -206,11 +206,27 @@ static ssize_t queue_write_hint_store(void *data, const char __user *buf,
return count;
}
+static int queue_zone_wlock_show(void *data, struct seq_file *m)
+{
+ struct request_queue *q = data;
+ unsigned int i;
+
+ if (!q->seq_zones_wlock)
+ return 0;
+
+ for (i = 0; i < blk_queue_nr_zones(q); i++)
+ if (test_bit(i, q->seq_zones_wlock))
+ seq_printf(m, "%u\n", i);
+
+ return 0;
+}
+
static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
{ "poll_stat", 0400, queue_poll_stat_show },
{ "requeue_list", 0400, .seq_ops = &queue_requeue_list_seq_ops },
{ "state", 0600, queue_state_show, queue_state_write },
{ "write_hints", 0600, queue_write_hint_show, queue_write_hint_store },
+ { "zone_wlock", 0400, queue_zone_wlock_show, NULL },
{ },
};