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597b89d30b
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>
31 lines
717 B
C
31 lines
717 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2021, NVIDIA Corporation.
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*/
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#include <linux/device.h>
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#include <linux/of.h>
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struct bus_type host1x_context_device_bus_type = {
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.name = "host1x-context",
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};
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EXPORT_SYMBOL_GPL(host1x_context_device_bus_type);
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static int __init host1x_context_device_bus_init(void)
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{
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int err;
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if (!of_machine_is_compatible("nvidia,tegra186") &&
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!of_machine_is_compatible("nvidia,tegra194") &&
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!of_machine_is_compatible("nvidia,tegra234"))
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return 0;
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err = bus_register(&host1x_context_device_bus_type);
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if (err < 0) {
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pr_err("bus type registration failed: %d\n", err);
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return err;
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}
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return 0;
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}
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postcore_initcall(host1x_context_device_bus_init);
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