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Commit ebc57e39 authored by Alexander Shishkin's avatar Alexander Shishkin
Browse files

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: default avatarAlexander Shishkin <alexander.shishkin@linux.intel.com>
parent 282ffec5

drivers/hwtracing/intel_th/Kconfig

+12 −0
Original line number Diff line number Diff line
@@ -25,6 +25,18 @@ config INTEL_TH_PCI 


	  Say Y here to enable PCI Intel TH support.



config INTEL_TH_ACPI

	tristate "Intel(R) Trace Hub ACPI controller"

	depends on ACPI

	help

	  Intel(R) Trace Hub may exist as an ACPI device. This option enables

	  support glue layer for ACPI-based Intel TH. This typically implies

	  'host debugger' mode, that is, the trace configuration and capture

	  is handled by an external debug host and corresponding controls will

	  not be available on the target.



	  Say Y here to enable ACPI Intel TH support.



config INTEL_TH_GTH

	tristate "Intel(R) Trace Hub Global Trace Hub"

	help

drivers/hwtracing/intel_th/Makefile

+3 −0
Original line number Diff line number Diff line
@@ -6,6 +6,9 @@ intel_th-$(CONFIG_INTEL_TH_DEBUG) += debug.o 
obj-$(CONFIG_INTEL_TH_PCI)	+= intel_th_pci.o

intel_th_pci-y			:= pci.o



obj-$(CONFIG_INTEL_TH_ACPI)	+= intel_th_acpi.o

intel_th_acpi-y			:= acpi.o



obj-$(CONFIG_INTEL_TH_GTH)	+= intel_th_gth.o

intel_th_gth-y			:= gth.o

drivers/hwtracing/intel_th/acpi.c

0 → 100644
+79 −0
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0

/*

 * Intel(R) Trace Hub ACPI driver

 *

 * Copyright (C) 2017 Intel Corporation.

 */



#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt



#include <linux/types.h>

#include <linux/module.h>

#include <linux/device.h>

#include <linux/sysfs.h>

#include <linux/platform_device.h>

#include <linux/acpi.h>



#include "intel_th.h"



#define DRIVER_NAME "intel_th_acpi"



static const struct intel_th_drvdata intel_th_acpi_pch = {

	.host_mode_only	= 1,

};



static const struct intel_th_drvdata intel_th_acpi_uncore = {

	.host_mode_only	= 1,

};



static const struct acpi_device_id intel_th_acpi_ids[] = {

	{ "INTC1000",	(kernel_ulong_t)&intel_th_acpi_uncore },

	{ "INTC1001",	(kernel_ulong_t)&intel_th_acpi_pch },

	{ "",		0 },

};



MODULE_DEVICE_TABLE(acpi, intel_th_acpi_ids);



static int intel_th_acpi_probe(struct platform_device *pdev)

{

	struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);

	const struct acpi_device_id *id;

	struct intel_th *th;



	id = acpi_match_device(intel_th_acpi_ids, &pdev->dev);

	if (!id)

		return -ENODEV;



	th = intel_th_alloc(&pdev->dev, (void *)id->driver_data,

			    pdev->resource, pdev->num_resources, -1);

	if (IS_ERR(th))

		return PTR_ERR(th);



	adev->driver_data = th;



	return 0;

}



static int intel_th_acpi_remove(struct platform_device *pdev)

{

	struct intel_th *th = platform_get_drvdata(pdev);



	intel_th_free(th);



	return 0;

}



static struct platform_driver intel_th_acpi_driver = {

	.probe		= intel_th_acpi_probe,

	.remove		= intel_th_acpi_remove,

	.driver		= {

		.name			= DRIVER_NAME,

		.acpi_match_table	= intel_th_acpi_ids,

	},

};



module_platform_driver(intel_th_acpi_driver);



MODULE_LICENSE("GPL v2");

MODULE_DESCRIPTION("Intel(R) Trace Hub ACPI controller driver");

MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@intel.com>");