block: Add fallthrough markers to switch statements

[karo-tx-linux.git] / block / blk-mq-debugfs.c

diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 803aed4d72216f5e23a585cb6d027115fa603ff9..9edebbdce0bdfc22ee9ba8319bb3cc58923bbfa7 100644 (file)
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -114,10 +114,12 @@ static ssize_t queue_state_write(void *data, const char __user *buf,
                blk_mq_run_hw_queues(q, true);
        } else if (strcmp(op, "start") == 0) {
                blk_mq_start_stopped_hw_queues(q, true);
+       } else if (strcmp(op, "kick") == 0) {
+               blk_mq_kick_requeue_list(q);
        } else {
                pr_err("%s: unsupported operation '%s'\n", __func__, op);
 inval:
-               pr_err("%s: use either 'run' or 'start'\n", __func__);
+               pr_err("%s: use 'run', 'start' or 'kick'\n", __func__);
                return -EINVAL;
        }
        return count;
@@ -267,6 +269,14 @@ static const char *const rqf_name[] = {
 };
 #undef RQF_NAME
 
+#define RQAF_NAME(name) [REQ_ATOM_##name] = #name
+static const char *const rqaf_name[] = {
+       RQAF_NAME(COMPLETE),
+       RQAF_NAME(STARTED),
+       RQAF_NAME(POLL_SLEPT),
+};
+#undef RQAF_NAME
+
 int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
 {
        const struct blk_mq_ops *const mq_ops = rq->q->mq_ops;
@@ -283,6 +293,8 @@ int __blk_mq_debugfs_rq_show(struct seq_file *m, struct request *rq)
        seq_puts(m, ", .rq_flags=");
        blk_flags_show(m, (__force unsigned int)rq->rq_flags, rqf_name,
                       ARRAY_SIZE(rqf_name));
+       seq_puts(m, ", .atomic_flags=");
+       blk_flags_show(m, rq->atomic_flags, rqaf_name, ARRAY_SIZE(rqaf_name));
        seq_printf(m, ", .tag=%d, .internal_tag=%d", rq->tag,
                   rq->internal_tag);
        if (mq_ops->show_rq)
@@ -298,6 +310,37 @@ int blk_mq_debugfs_rq_show(struct seq_file *m, void *v)
 }
 EXPORT_SYMBOL_GPL(blk_mq_debugfs_rq_show);
 
+static void *queue_requeue_list_start(struct seq_file *m, loff_t *pos)
+       __acquires(&q->requeue_lock)
+{
+       struct request_queue *q = m->private;
+
+       spin_lock_irq(&q->requeue_lock);
+       return seq_list_start(&q->requeue_list, *pos);
+}
+
+static void *queue_requeue_list_next(struct seq_file *m, void *v, loff_t *pos)
+{
+       struct request_queue *q = m->private;
+
+       return seq_list_next(v, &q->requeue_list, pos);
+}
+
+static void queue_requeue_list_stop(struct seq_file *m, void *v)
+       __releases(&q->requeue_lock)
+{
+       struct request_queue *q = m->private;
+
+       spin_unlock_irq(&q->requeue_lock);
+}
+
+static const struct seq_operations queue_requeue_list_seq_ops = {
+       .start  = queue_requeue_list_start,
+       .next   = queue_requeue_list_next,
+       .stop   = queue_requeue_list_stop,
+       .show   = blk_mq_debugfs_rq_show,
+};
+
 static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos)
        __acquires(&hctx->lock)
 {
@@ -329,6 +372,36 @@ static const struct seq_operations hctx_dispatch_seq_ops = {
        .show   = blk_mq_debugfs_rq_show,
 };
 
+struct show_busy_params {
+       struct seq_file         *m;
+       struct blk_mq_hw_ctx    *hctx;
+};
+
+/*
+ * Note: the state of a request may change while this function is in progress,
+ * e.g. due to a concurrent blk_mq_finish_request() call.
+ */
+static void hctx_show_busy_rq(struct request *rq, void *data, bool reserved)
+{
+       const struct show_busy_params *params = data;
+
+       if (blk_mq_map_queue(rq->q, rq->mq_ctx->cpu) == params->hctx &&
+           test_bit(REQ_ATOM_STARTED, &rq->atomic_flags))
+               __blk_mq_debugfs_rq_show(params->m,
+                                        list_entry_rq(&rq->queuelist));
+}
+
+static int hctx_busy_show(void *data, struct seq_file *m)
+{
+       struct blk_mq_hw_ctx *hctx = data;
+       struct show_busy_params params = { .m = m, .hctx = hctx };
+
+       blk_mq_tagset_busy_iter(hctx->queue->tag_set, hctx_show_busy_rq,
+                               &params);
+
+       return 0;
+}
+
 static int hctx_ctx_map_show(void *data, struct seq_file *m)
 {
        struct blk_mq_hw_ctx *hctx = data;
@@ -655,6 +728,7 @@ const struct file_operations blk_mq_debugfs_fops = {
 
 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},
        {},
 };
@@ -663,6 +737,7 @@ static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
        {"state", 0400, hctx_state_show},
        {"flags", 0400, hctx_flags_show},
        {"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops},
+       {"busy", 0400, hctx_busy_show},
        {"ctx_map", 0400, hctx_ctx_map_show},
        {"tags", 0400, hctx_tags_show},
        {"tags_bitmap", 0400, hctx_tags_bitmap_show},