Re: [PATCH 5/6] iommu/qcom: Index contexts by asid number to allow asid 0

Brian Masney
2022-06-03T15:25:24Z

On Fri, May 27, 2022 at 11:29:00PM +0200, Konrad Dybcio wrote:
> From: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
>
> This driver was indexing the contexts by asid-1, which is probably
> done under the assumption that the first ASID is always 1.
>
> Unfortunately this is not entirely true: at least in the MSM8956
> and MSM8976 GPU IOMMU, the gpu_user context's ASID number is zero.
> To allow using an asid number of zero, stop indexing the contexts
> by asid-1 and rather index them by asid.
>
> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
> Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@somainline.org>

msm8974 will need this as well.

Reviewed-by: Brian Masney <bmasney@redhat.com>