90 lines
2.7 KiB
C
90 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Intel PMC Core platform init
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* Copyright (c) 2019, Google Inc.
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* Author - Rajat Jain
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*
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* This code instantiates platform devices for intel_pmc_core driver, only
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* on supported platforms that may not have the ACPI devices in the ACPI tables.
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* No new platforms should be added here, because we expect that new platforms
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* should all have the ACPI device, which is the preferred way of enumeration.
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*/
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#include <linux/acpi.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <asm/cpu_device_id.h>
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#include <asm/intel-family.h>
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#include <xen/xen.h>
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static void intel_pmc_core_release(struct device *dev)
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{
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kfree(dev);
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}
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static struct platform_device *pmc_core_device;
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/*
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* intel_pmc_core_platform_ids is the list of platforms where we want to
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* instantiate the platform_device if not already instantiated. This is
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* different than intel_pmc_core_ids in intel_pmc_core.c which is the
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* list of platforms that the driver supports for pmc_core device. The
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* other list may grow, but this list should not.
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*/
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static const struct x86_cpu_id intel_pmc_core_platform_ids[] = {
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X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE_L, &pmc_core_device),
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X86_MATCH_INTEL_FAM6_MODEL(SKYLAKE, &pmc_core_device),
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X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE_L, &pmc_core_device),
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X86_MATCH_INTEL_FAM6_MODEL(KABYLAKE, &pmc_core_device),
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X86_MATCH_INTEL_FAM6_MODEL(CANNONLAKE_L, &pmc_core_device),
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X86_MATCH_INTEL_FAM6_MODEL(ICELAKE_L, &pmc_core_device),
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X86_MATCH_INTEL_FAM6_MODEL(COMETLAKE, &pmc_core_device),
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X86_MATCH_INTEL_FAM6_MODEL(COMETLAKE_L, &pmc_core_device),
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{}
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};
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MODULE_DEVICE_TABLE(x86cpu, intel_pmc_core_platform_ids);
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static int __init pmc_core_platform_init(void)
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{
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int retval;
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/* Skip creating the platform device if ACPI already has a device */
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if (acpi_dev_present("INT33A1", NULL, -1))
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return -ENODEV;
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/*
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* Skip forcefully attaching the device for VMs. Make an exception for
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* Xen dom0, which does have full hardware access.
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*/
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if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR) && !xen_initial_domain())
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return -ENODEV;
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if (!x86_match_cpu(intel_pmc_core_platform_ids))
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return -ENODEV;
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pmc_core_device = kzalloc(sizeof(*pmc_core_device), GFP_KERNEL);
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if (!pmc_core_device)
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return -ENOMEM;
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pmc_core_device->name = "intel_pmc_core";
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pmc_core_device->dev.release = intel_pmc_core_release;
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retval = platform_device_register(pmc_core_device);
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if (retval)
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platform_device_put(pmc_core_device);
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return retval;
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}
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static void __exit pmc_core_platform_exit(void)
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{
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platform_device_unregister(pmc_core_device);
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}
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module_init(pmc_core_platform_init);
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module_exit(pmc_core_platform_exit);
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MODULE_LICENSE("GPL v2");
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