tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
gpu: host1x: Add context bus
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>
authored by
Mikko Perttunen
and committed by
Thierry Reding
597b89d3
cb7e1abc
+53
-2
+1
-2
drivers/gpu/Makefile
+1
-2
drivers/gpu/Makefile
···
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# drm/tegra depends on host1x, so if both drivers are built-in care must be
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# taken to initialize them in the correct order. Link order is the only way
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# to ensure this currently.
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-
obj-$(CONFIG_TEGRA_HOST1X) += host1x/
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obj-y += drm/ vga/
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obj-y += host1x/ drm/ vga/
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obj-$(CONFIG_IMX_IPUV3_CORE) += ipu-v3/
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obj-$(CONFIG_TRACE_GPU_MEM) += trace/
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drivers/gpu/host1x/Kconfig
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drivers/gpu/host1x/Kconfig
···
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# SPDX-License-Identifier: GPL-2.0-only
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config TEGRA_HOST1X_CONTEXT_BUS
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bool
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config TEGRA_HOST1X
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tristate "NVIDIA Tegra host1x driver"
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depends on ARCH_TEGRA || (ARM && COMPILE_TEST)
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select DMA_SHARED_BUFFER
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select TEGRA_HOST1X_CONTEXT_BUS
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select IOMMU_IOVA
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help
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Driver for the NVIDIA Tegra host1x hardware.
+1
drivers/gpu/host1x/Makefile
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drivers/gpu/host1x/Makefile
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drivers/gpu/host1x/context_bus.c
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drivers/gpu/host1x/context_bus.c
···
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// 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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include/linux/host1x_context_bus.h
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include/linux/host1x_context_bus.h
···
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/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (c) 2021, NVIDIA Corporation. All rights reserved.
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*/
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#ifndef __LINUX_HOST1X_CONTEXT_BUS_H
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#define __LINUX_HOST1X_CONTEXT_BUS_H
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#include <linux/device.h>
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#ifdef CONFIG_TEGRA_HOST1X_CONTEXT_BUS
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extern struct bus_type host1x_context_device_bus_type;
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#endif
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#endif