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// SPDX-License-Identifier: GPL-2.0
/*
* Intel PMC Core platform init
* Copyright (c) 2019, Google Inc.
* Author - Rajat Jain
*
* This code instantiates platform devices for intel_pmc_core driver, only
* on supported platforms that may not have the ACPI devices in the ACPI tables.
* No new platforms should be added here, because we expect that new platforms
* should all have the ACPI device, which is the preferred way of enumeration.
*/
#include <linux/acpi.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
#include <xen/xen.h>
static void intel_pmc_core_release(struct device *dev)
{
/* Nothing to do. */
}
static struct platform_device pmc_core_device = {
.name = "intel_pmc_core",
.dev = {
.release = intel_pmc_core_release,
},
};
/*
* intel_pmc_core_platform_ids is the list of platforms where we want to
* instantiate the platform_device if not already instantiated. This is
* different than intel_pmc_core_ids in intel_pmc_core.c which is the
* list of platforms that the driver supports for pmc_core device. The
* other list may grow, but this list should not.
*/
static const struct x86_cpu_id intel_pmc_core_platform_ids[] = {
INTEL_CPU_FAM6(SKYLAKE_L, pmc_core_device),
INTEL_CPU_FAM6(SKYLAKE, pmc_core_device),
INTEL_CPU_FAM6(KABYLAKE_L, pmc_core_device),
INTEL_CPU_FAM6(KABYLAKE, pmc_core_device),
INTEL_CPU_FAM6(CANNONLAKE_L, pmc_core_device),
INTEL_CPU_FAM6(ICELAKE_L, pmc_core_device),
INTEL_CPU_FAM6(COMETLAKE, pmc_core_device),
INTEL_CPU_FAM6(COMETLAKE_L, pmc_core_device),
{}
};
MODULE_DEVICE_TABLE(x86cpu, intel_pmc_core_platform_ids);
static int __init pmc_core_platform_init(void)
{
/* Skip creating the platform device if ACPI already has a device */
if (acpi_dev_present("INT33A1", NULL, -1))
return -ENODEV;
/*
* Skip forcefully attaching the device for VMs. Make an exception for
* Xen dom0, which does have full hardware access.
*/
if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR) && !xen_initial_domain())
return -ENODEV;
if (!x86_match_cpu(intel_pmc_core_platform_ids))
return -ENODEV;
return platform_device_register(&pmc_core_device);
}
static void __exit pmc_core_platform_exit(void)
{
platform_device_unregister(&pmc_core_device);
}
module_init(pmc_core_platform_init);
module_exit(pmc_core_platform_exit);
MODULE_LICENSE("GPL v2");
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