On 2017-12-20 02:21 PM, Christian König wrote:
> TTM tries to allocate coherent memory in chunks of 2MB first to improve
> TLB efficiency and falls back to allocating 4K pages if that fails.
>
> Suppress the warning when the 2MB allocations fails since there is a
> valid fall back path.
>
> Signed-off-by: Christian König <christian.koenig at amd.com>
> ---
> lib/swiotlb.c | 8 +++++---
> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/lib/swiotlb.c b/lib/swiotlb.c
> index cea19aaf303c..63a44fb29ce6 100644
> --- a/lib/swiotlb.c
> +++ b/lib/swiotlb.c
> @@ -769,9 +769,11 @@ swiotlb_alloc_coherent(struct device *hwdev, size_t size,
> return ret;
>
> err_warn:
> - pr_warn("swiotlb: coherent allocation failed for device %s size=%zu\n",
> - dev_name(hwdev), size);
> - dump_stack();
> + if (!(flags & __GFP_NOWARN)) {
> + pr_warn("swiotlb: coherent allocation failed for device %s size=%zu\n",
> + dev_name(hwdev), size);
> + dump_stack();
> + }
>
> return NULL;
> }
>
This isn't the only swiotlb message I'm hitting, also this from
swiotlb_tbl_map_single:
radeon 0000:00:01.0: swiotlb buffer is full (sz: 2097152 bytes)
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
