On 4/29/21 1:28 AM, Christoph Hellwig wrote:
> If the user already specified a swiotlb size on the command line,
> swiotlb_adjust_size shoul not overwrite it.
>
> Fixes: 2cbc2776efe4 ("swiotlb: remove swiotlb_nr_tbl")
> Reported-by: Tom Lendacky <[email protected]>
Thanks, Christoph!
Tested-by: Tom Lendacky <[email protected]>
> Signed-off-by: Christoph Hellwig <[email protected]>
> ---
> kernel/dma/swiotlb.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
> index 8635a57f88e9..8ca7d505d61c 100644
> --- a/kernel/dma/swiotlb.c
> +++ b/kernel/dma/swiotlb.c
> @@ -118,6 +118,8 @@ void __init swiotlb_adjust_size(unsigned long size)
> * architectures such as those supporting memory encryption to
> * adjust/expand SWIOTLB size for their use.
> */
> + if (default_nslabs != IO_TLB_DEFAULT_SIZE >> IO_TLB_SHIFT)
> + return;
> size = ALIGN(size, IO_TLB_SIZE);
> default_nslabs = ALIGN(size >> IO_TLB_SHIFT, IO_TLB_SEGSIZE);
> pr_info("SWIOTLB bounce buffer size adjusted to %luMB", size >> 20);
>
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