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swiotlb: fix passing local variable to debugfs_create_ulong()

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Debugfs node will be run-timely checked and so local variable
should be not passed to debugfs_create_ulong(). Fix it via
debugfs_create_file() to create io_tlb_used node and calculate
used io tlb number with fops_io_tlb_used attribute.

Fixes: 20347fca71 ("swiotlb: split up the global swiotlb lock")
Signed-off-by: Tianyu Lan <tiala@microsoft.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Tianyu Lan 2022-07-28 03:24:20 -04:00 committed by Christoph Hellwig
parent 8419702489
commit 5c850d3188
1 changed files with 9 additions and 3 deletions
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12
kernel/dma/swiotlb.c
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@ -912,17 +912,23 @@ bool is_swiotlb_active(struct device *dev)
}
EXPORT_SYMBOL_GPL(is_swiotlb_active);
static int io_tlb_used_get(void *data, u64 *val)
{
*val = mem_used(&io_tlb_default_mem);
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(fops_io_tlb_used, io_tlb_used_get, NULL, "%llu\n");
static void swiotlb_create_debugfs_files(struct io_tlb_mem *mem,
const char *dirname)
{
unsigned long used = mem_used(mem);
mem->debugfs = debugfs_create_dir(dirname, io_tlb_default_mem.debugfs);
if (!mem->nslabs)
return;
debugfs_create_ulong("io_tlb_nslabs", 0400, mem->debugfs, &mem->nslabs);
debugfs_create_ulong("io_tlb_used", 0400, mem->debugfs, &used);
debugfs_create_file("io_tlb_used", 0400, mem->debugfs, NULL,
&fops_io_tlb_used);
}
static int __init __maybe_unused swiotlb_create_default_debugfs(void)