// SPDX-License-Identifier: GPL-2.0 /* * Intel Turbo Boost Max Technology 3.0 legacy (non HWP) enumeration driver * Copyright (c) 2017, Intel Corporation. * All rights reserved. * * Author: Srinivas Pandruvada <[email protected]> */ #define pr_fmt(fmt) … #include <linux/cpufeature.h> #include <linux/cpuhotplug.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/topology.h> #include <linux/workqueue.h> #include <asm/cpu_device_id.h> #include <asm/intel-family.h> #define MSR_OC_MAILBOX … #define MSR_OC_MAILBOX_CMD_OFFSET … #define MSR_OC_MAILBOX_RSP_OFFSET … #define MSR_OC_MAILBOX_BUSY_BIT … #define OC_MAILBOX_FC_CONTROL_CMD … /* * Typical latency to get mail box response is ~3us, It takes +3 us to * process reading mailbox after issuing mailbox write on a Broadwell 3.4 GHz * system. So for most of the time, the first mailbox read should have the * response, but to avoid some boundary cases retry twice. */ #define OC_MAILBOX_RETRY_COUNT … static int get_oc_core_priority(unsigned int cpu) { … } /* * The work item is needed to avoid CPU hotplug locking issues. The function * itmt_legacy_set_priority() is called from CPU online callback, so can't * call sched_set_itmt_support() from there as this function will aquire * hotplug locks in its path. */ static void itmt_legacy_work_fn(struct work_struct *work) { … } static DECLARE_WORK(sched_itmt_work, itmt_legacy_work_fn); static int itmt_legacy_cpu_online(unsigned int cpu) { … } static const struct x86_cpu_id itmt_legacy_cpu_ids[] = …; static int __init itmt_legacy_init(void) { … } late_initcall(…) …
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