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gpu: host1x: Add context bus

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The context bus is a "dummy" bus that contains struct devices that
correspond to IOMMU contexts assigned through Host1x to processes.

Even when host1x itself is built as a module, the bus is registered
in built-in code so that the built-in ARM SMMU driver is able to
reference it.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Mikko Perttunen
2022-05-16 11:52:51 +03:00
committed by Thierry Reding
parent cb7e1abc2c
commit 597b89d30b
5 changed files with 53 additions and 2 deletions
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5
drivers/gpu/host1x/Kconfig
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@@ -1,8 +1,13 @@
# SPDX-License-Identifier: GPL-2.0-only
config TEGRA_HOST1X_CONTEXT_BUS
bool
config TEGRA_HOST1X
tristate "NVIDIA Tegra host1x driver"
depends on ARCH_TEGRA || (ARM && COMPILE_TEST)
select DMA_SHARED_BUFFER
select TEGRA_HOST1X_CONTEXT_BUS
select IOMMU_IOVA
help
Driver for the NVIDIA Tegra host1x hardware.