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swiotlb: Refactor swiotlb_create_debugfs

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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>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Claire Chang 2021-06-19 11:40:33 +08:00 committed by Konrad Rzeszutek Wilk
parent 0a65579cdd
commit 6e675a1c45
1 changed files with 14 additions and 7 deletions
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21
kernel/dma/swiotlb.c
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@ -669,19 +669,26 @@ 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)
{
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;
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);
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