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iommu/tegra: Add tegra_dev_iommu_get_stream_id() helper

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Access to the internals of struct iommu_fwspec by non-IOMMU drivers is
discouraged. Many drivers for Tegra SoCs, however, need access to their
IOMMU stream IDs so that they can be programmed into various hardware
registers.

Formalize this access into a common helper to make it easier to audit
and maintain.

Acked-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20221206165945.3551774-3-thierry.reding@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Thierry Reding
2022-12-06 17:59:41 +01:00
committed by Ulf Hansson
parent 495b637f64
commit 493c9b68d1
1 changed files with 21 additions and 0 deletions
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21
include/linux/iommu.h
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@@ -1103,4 +1103,25 @@ static inline void iommu_dma_compose_msi_msg(struct msi_desc *desc, struct msi_m
#endif /* CONFIG_IOMMU_DMA */
/*
* Newer generations of Tegra SoCs require devices' stream IDs to be directly programmed into
* some registers. These are always paired with a Tegra SMMU or ARM SMMU, for which the contents
* of the struct iommu_fwspec are known. Use this helper to formalize access to these internals.
*/
#define TEGRA_STREAM_ID_BYPASS 0x7f
static inline bool tegra_dev_iommu_get_stream_id(struct device *dev, u32 *stream_id)
{
#ifdef CONFIG_IOMMU_API
struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
if (fwspec && fwspec->num_ids == 1) {
*stream_id = fwspec->ids[0] & 0xffff;
return true;
}
#endif
return false;
}
#endif /* __LINUX_IOMMU_H */