iommu/qcom: Index contexts by asid number to allow asid 0

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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 always true: at least for MSM8956 and
MSM8976's GPU IOMMU, the gpu_user context's ASID number is zero.
To allow using a zero asid number, index the contexts by `asid`
instead of by `asid - 1`.

While at it, also enhance human readability by renaming the
`num_ctxs` member of struct qcom_iommu_dev to `max_asid`.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20230622092742.74819-5-angelogioacchino.delregno@collabora.com
Signed-off-by: Will Deacon <will@kernel.org>

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AngeloGioacchino Del Regno 2023-06-22 11:27:40 +02:00 • committed by Will Deacon

parent 9f3fef23d9

commit ec5601661b

1 changed files with 10 additions and 12 deletions

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drivers/iommu/arm/arm-smmu/qcom_iommu.c

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