diff mbox series

[v14,02/12] swiotlb: Refactor swiotlb_create_debugfs

Message ID 20210619034043.199220-3-tientzu@chromium.org (mailing list archive)
State New, archived
Headers show
Series Restricted DMA | expand

Commit Message

Claire Chang June 19, 2021, 3:40 a.m. UTC 
Split the debugfs creation to make the code reusable for supporting
different bounce buffer pools.

Signed-off-by: Claire Chang <tientzu@chromium.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Tested-by: Stefano Stabellini <sstabellini@kernel.org>
Tested-by: Will Deacon <will@kernel.org>
---
 kernel/dma/swiotlb.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)
diff mbox series

Patch

diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 1f9b2b9e7490..ede66df6835b 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -671,19 +671,26 @@  bool is_swiotlb_active(void)
 EXPORT_SYMBOL_GPL(is_swiotlb_active);
 
 #ifdef CONFIG_DEBUG_FS
+static struct dentry *debugfs_dir;
 
-static int __init swiotlb_create_debugfs(void)
+static void swiotlb_create_debugfs_files(struct io_tlb_mem *mem)
 {
-	struct io_tlb_mem *mem = io_tlb_default_mem;
-
-	if (!mem)
-		return 0;
-	mem->debugfs = debugfs_create_dir("swiotlb", NULL);
 	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;
+
+	debugfs_dir = debugfs_create_dir("swiotlb", NULL);
+	if (mem) {
+		mem->debugfs = debugfs_dir;
+		swiotlb_create_debugfs_files(mem);
+	}
 	return 0;
 }
 
-late_initcall(swiotlb_create_debugfs);
+late_initcall(swiotlb_create_default_debugfs);
 
 #endif