[PATCH v6 02/15] swiotlb: Refactor swiotlb_create_debugfs

[Claire Chang <tientzu@xxxxxxxxxxxx>]

Split the debugfs creation to make the code reusable for supporting
different bounce buffer pools, e.g. restricted DMA pool.

Signed-off-by: Claire Chang <tientzu@xxxxxxxxxxxx>
---
 kernel/dma/swiotlb.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index d3232fc19385..858475bd6923 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -64,6 +64,7 @@
 enum swiotlb_force swiotlb_force;
 
 struct io_tlb_mem *io_tlb_default_mem;
+static struct dentry *debugfs_dir;
 
 /*
  * Max segment that we can provide which (if pages are contingous) will
@@ -662,18 +663,27 @@ EXPORT_SYMBOL_GPL(is_swiotlb_active);
 
 #ifdef CONFIG_DEBUG_FS
 
-static int __init swiotlb_create_debugfs(void)
+static void swiotlb_create_debugfs(struct io_tlb_mem *mem, const char *name,
+                                  struct dentry *node)
 {
-       struct io_tlb_mem *mem = io_tlb_default_mem;
-
        if (!mem)
-               return 0;
-       mem->debugfs = debugfs_create_dir("swiotlb", NULL);
+               return;
+
+       mem->debugfs = debugfs_create_dir(name, node);
        debugfs_create_ulong("io_tlb_nslabs", 0400, mem->debugfs, &mem->nslabs);
        debugfs_create_ulong("io_tlb_used", 0400, mem->debugfs, &mem->used);
+}
+
+static int __init swiotlb_create_default_debugfs(void)
+{
+       struct io_tlb_mem *mem = io_tlb_default_mem;
+
+       swiotlb_create_debugfs(mem, "swiotlb", NULL);
+       debugfs_dir = mem->debugfs;
+
        return 0;
 }
 
-late_initcall(swiotlb_create_debugfs);
+late_initcall(swiotlb_create_default_debugfs);
 
 #endif
-- 
2.31.1.607.g51e8a6a459-goog