tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
intel_th: Add ACPI glue layer
The Trace Hub devices now can be enumerated as ACPI devices, which
translates into "Host Debugger mode". There are two IDs: one for
PCH Trace Hub, and one for the uncore Trace Hub. These are expected
to stay the same across all platforms.
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
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drivers/hwtracing/intel_th/Kconfig
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drivers/hwtracing/intel_th/Kconfig
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Say Y here to enable PCI Intel TH support.
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config INTEL_TH_ACPI
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tristate "Intel(R) Trace Hub ACPI controller"
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depends on ACPI
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help
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Intel(R) Trace Hub may exist as an ACPI device. This option enables
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support glue layer for ACPI-based Intel TH. This typically implies
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'host debugger' mode, that is, the trace configuration and capture
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is handled by an external debug host and corresponding controls will
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not be available on the target.
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Say Y here to enable ACPI Intel TH support.
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config INTEL_TH_GTH
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tristate "Intel(R) Trace Hub Global Trace Hub"
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help
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drivers/hwtracing/intel_th/Makefile
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drivers/hwtracing/intel_th/Makefile
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drivers/hwtracing/intel_th/acpi.c
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drivers/hwtracing/intel_th/acpi.c
···
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Intel(R) Trace Hub ACPI driver
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*
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* Copyright (C) 2017 Intel Corporation.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/sysfs.h>
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#include <linux/platform_device.h>
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#include <linux/acpi.h>
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#include "intel_th.h"
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#define DRIVER_NAME "intel_th_acpi"
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static const struct intel_th_drvdata intel_th_acpi_pch = {
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.host_mode_only = 1,
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};
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static const struct intel_th_drvdata intel_th_acpi_uncore = {
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.host_mode_only = 1,
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};
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static const struct acpi_device_id intel_th_acpi_ids[] = {
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{ "INTC1000", (kernel_ulong_t)&intel_th_acpi_uncore },
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{ "INTC1001", (kernel_ulong_t)&intel_th_acpi_pch },
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{ "", 0 },
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};
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MODULE_DEVICE_TABLE(acpi, intel_th_acpi_ids);
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static int intel_th_acpi_probe(struct platform_device *pdev)
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{
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struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
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const struct acpi_device_id *id;
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struct intel_th *th;
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id = acpi_match_device(intel_th_acpi_ids, &pdev->dev);
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if (!id)
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return -ENODEV;
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th = intel_th_alloc(&pdev->dev, (void *)id->driver_data,
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pdev->resource, pdev->num_resources, -1);
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if (IS_ERR(th))
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return PTR_ERR(th);
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adev->driver_data = th;
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return 0;
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}
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static int intel_th_acpi_remove(struct platform_device *pdev)
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{
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struct intel_th *th = platform_get_drvdata(pdev);
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intel_th_free(th);
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return 0;
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}
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static struct platform_driver intel_th_acpi_driver = {
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.probe = intel_th_acpi_probe,
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.remove = intel_th_acpi_remove,
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.driver = {
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.name = DRIVER_NAME,
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.acpi_match_table = intel_th_acpi_ids,
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},
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};
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module_platform_driver(intel_th_acpi_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Intel(R) Trace Hub ACPI controller driver");
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MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@intel.com>");