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1// SPDX-License-Identifier: GPL-2.02 3/*4 * Intel PMC Core platform init5 * Copyright (c) 2019, Google Inc.6 * Author - Rajat Jain7 *8 * This code instantiates platform devices for intel_pmc_core driver, only9 * on supported platforms that may not have the ACPI devices in the ACPI tables.10 * No new platforms should be added here, because we expect that new platforms11 * should all have the ACPI device, which is the preferred way of enumeration.12 */13 14#include <linux/acpi.h>15#include <linux/module.h>16#include <linux/platform_device.h>17 18#include <asm/cpu_device_id.h>19#include <asm/intel-family.h>20 21#include <xen/xen.h>22 23static void intel_pmc_core_release(struct device *dev)24{25 kfree(dev);26}27 28static struct platform_device *pmc_core_device;29 30/*31 * intel_pmc_core_platform_ids is the list of platforms where we want to32 * instantiate the platform_device if not already instantiated. This is33 * different than intel_pmc_core_ids in intel_pmc_core.c which is the34 * list of platforms that the driver supports for pmc_core device. The35 * other list may grow, but this list should not.36 */37static const struct x86_cpu_id intel_pmc_core_platform_ids[] = {38 X86_MATCH_VFM(INTEL_SKYLAKE_L, &pmc_core_device),39 X86_MATCH_VFM(INTEL_SKYLAKE, &pmc_core_device),40 X86_MATCH_VFM(INTEL_KABYLAKE_L, &pmc_core_device),41 X86_MATCH_VFM(INTEL_KABYLAKE, &pmc_core_device),42 X86_MATCH_VFM(INTEL_CANNONLAKE_L, &pmc_core_device),43 X86_MATCH_VFM(INTEL_ICELAKE_L, &pmc_core_device),44 X86_MATCH_VFM(INTEL_COMETLAKE, &pmc_core_device),45 X86_MATCH_VFM(INTEL_COMETLAKE_L, &pmc_core_device),46 {}47};48MODULE_DEVICE_TABLE(x86cpu, intel_pmc_core_platform_ids);49 50static int __init pmc_core_platform_init(void)51{52 int retval;53 54 /* Skip creating the platform device if ACPI already has a device */55 if (acpi_dev_present("INT33A1", NULL, -1))56 return -ENODEV;57 58 /*59 * Skip forcefully attaching the device for VMs. Make an exception for60 * Xen dom0, which does have full hardware access.61 */62 if (cpu_feature_enabled(X86_FEATURE_HYPERVISOR) && !xen_initial_domain())63 return -ENODEV;64 65 if (!x86_match_cpu(intel_pmc_core_platform_ids))66 return -ENODEV;67 68 pmc_core_device = kzalloc(sizeof(*pmc_core_device), GFP_KERNEL);69 if (!pmc_core_device)70 return -ENOMEM;71 72 pmc_core_device->name = "intel_pmc_core";73 pmc_core_device->dev.release = intel_pmc_core_release;74 75 retval = platform_device_register(pmc_core_device);76 if (retval)77 platform_device_put(pmc_core_device);78 79 return retval;80}81 82static void __exit pmc_core_platform_exit(void)83{84 platform_device_unregister(pmc_core_device);85}86 87module_init(pmc_core_platform_init);88module_exit(pmc_core_platform_exit);89MODULE_DESCRIPTION("Intel PMC Core platform driver");90MODULE_LICENSE("GPL v2");91