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Diffstat (limited to 'block/blk-mq-debugfs.c')
-rw-r--r--block/blk-mq-debugfs.c110
1 files changed, 62 insertions, 48 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c
index 1dc1847b5363..260cf76e0705 100644
--- a/block/blk-mq-debugfs.c
+++ b/block/blk-mq-debugfs.c
@@ -687,19 +687,46 @@ static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
{},
};
+static bool debugfs_create_files(struct dentry *parent, void *data,
+ const struct blk_mq_debugfs_attr *attr)
+{
+ d_inode(parent)->i_private = data;
+
+ for (; attr->name; attr++) {
+ if (!debugfs_create_file(attr->name, attr->mode, parent,
+ (void *)attr, &blk_mq_debugfs_fops))
+ return false;
+ }
+ return true;
+}
+
int blk_mq_debugfs_register(struct request_queue *q)
{
+ struct blk_mq_hw_ctx *hctx;
+ int i;
+
if (!blk_debugfs_root)
return -ENOENT;
q->debugfs_dir = debugfs_create_dir(kobject_name(q->kobj.parent),
blk_debugfs_root);
if (!q->debugfs_dir)
- goto err;
+ return -ENOMEM;
- if (blk_mq_debugfs_register_mq(q))
+ if (!debugfs_create_files(q->debugfs_dir, q,
+ blk_mq_debugfs_queue_attrs))
goto err;
+ /*
+ * blk_mq_init_hctx() attempted to do this already, but q->debugfs_dir
+ * didn't exist yet (because we don't know what to name the directory
+ * until the queue is registered to a gendisk).
+ */
+ queue_for_each_hw_ctx(q, hctx, i) {
+ if (!hctx->debugfs_dir && blk_mq_debugfs_register_hctx(q, hctx))
+ goto err;
+ }
+
return 0;
err:
@@ -710,32 +737,17 @@ err:
void blk_mq_debugfs_unregister(struct request_queue *q)
{
debugfs_remove_recursive(q->debugfs_dir);
- q->mq_debugfs_dir = NULL;
q->debugfs_dir = NULL;
}
-static bool debugfs_create_files(struct dentry *parent, void *data,
- const struct blk_mq_debugfs_attr *attr)
-{
- d_inode(parent)->i_private = data;
-
- for (; attr->name; attr++) {
- if (!debugfs_create_file(attr->name, attr->mode, parent,
- (void *)attr, &blk_mq_debugfs_fops))
- return false;
- }
- return true;
-}
-
-static int blk_mq_debugfs_register_ctx(struct request_queue *q,
- struct blk_mq_ctx *ctx,
- struct dentry *hctx_dir)
+static int blk_mq_debugfs_register_ctx(struct blk_mq_hw_ctx *hctx,
+ struct blk_mq_ctx *ctx)
{
struct dentry *ctx_dir;
char name[20];
snprintf(name, sizeof(name), "cpu%u", ctx->cpu);
- ctx_dir = debugfs_create_dir(name, hctx_dir);
+ ctx_dir = debugfs_create_dir(name, hctx->debugfs_dir);
if (!ctx_dir)
return -ENOMEM;
@@ -745,59 +757,61 @@ static int blk_mq_debugfs_register_ctx(struct request_queue *q,
return 0;
}
-static int blk_mq_debugfs_register_hctx(struct request_queue *q,
- struct blk_mq_hw_ctx *hctx)
+int blk_mq_debugfs_register_hctx(struct request_queue *q,
+ struct blk_mq_hw_ctx *hctx)
{
struct blk_mq_ctx *ctx;
- struct dentry *hctx_dir;
char name[20];
int i;
+ if (!q->debugfs_dir)
+ return -ENOENT;
+
snprintf(name, sizeof(name), "hctx%u", hctx->queue_num);
- hctx_dir = debugfs_create_dir(name, q->mq_debugfs_dir);
- if (!hctx_dir)
+ hctx->debugfs_dir = debugfs_create_dir(name, q->debugfs_dir);
+ if (!hctx->debugfs_dir)
return -ENOMEM;
- if (!debugfs_create_files(hctx_dir, hctx, blk_mq_debugfs_hctx_attrs))
- return -ENOMEM;
+ if (!debugfs_create_files(hctx->debugfs_dir, hctx,
+ blk_mq_debugfs_hctx_attrs))
+ goto err;
hctx_for_each_ctx(hctx, ctx, i) {
- if (blk_mq_debugfs_register_ctx(q, ctx, hctx_dir))
- return -ENOMEM;
+ if (blk_mq_debugfs_register_ctx(hctx, ctx))
+ goto err;
}
return 0;
+
+err:
+ blk_mq_debugfs_unregister_hctx(hctx);
+ return -ENOMEM;
+}
+
+void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
+{
+ debugfs_remove_recursive(hctx->debugfs_dir);
+ hctx->debugfs_dir = NULL;
}
-int blk_mq_debugfs_register_mq(struct request_queue *q)
+int blk_mq_debugfs_register_hctxs(struct request_queue *q)
{
struct blk_mq_hw_ctx *hctx;
int i;
- if (!q->debugfs_dir)
- return -ENOENT;
-
- q->mq_debugfs_dir = debugfs_create_dir("mq", q->debugfs_dir);
- if (!q->mq_debugfs_dir)
- goto err;
-
- if (!debugfs_create_files(q->mq_debugfs_dir, q, blk_mq_debugfs_queue_attrs))
- goto err;
-
queue_for_each_hw_ctx(q, hctx, i) {
if (blk_mq_debugfs_register_hctx(q, hctx))
- goto err;
+ return -ENOMEM;
}
return 0;
-
-err:
- blk_mq_debugfs_unregister_mq(q);
- return -ENOMEM;
}
-void blk_mq_debugfs_unregister_mq(struct request_queue *q)
+void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
{
- debugfs_remove_recursive(q->mq_debugfs_dir);
- q->mq_debugfs_dir = NULL;
+ struct blk_mq_hw_ctx *hctx;
+ int i;
+
+ queue_for_each_hw_ctx(q, hctx, i)
+ blk_mq_debugfs_unregister_hctx(hctx);
}