diff options
Diffstat (limited to 'drivers/platform/x86/intel_turbo_max_3.c')
| -rw-r--r-- | drivers/platform/x86/intel_turbo_max_3.c | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/drivers/platform/x86/intel_turbo_max_3.c b/drivers/platform/x86/intel_turbo_max_3.c deleted file mode 100644 index 4f60d8e32a0a..000000000000 --- a/drivers/platform/x86/intel_turbo_max_3.c +++ /dev/null @@ -1,151 +0,0 @@ -/* - * Intel Turbo Boost Max Technology 3.0 legacy (non HWP) enumeration driver - * Copyright (c) 2017, Intel Corporation. - * All rights reserved. - * - * Author: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - * - * This program is free software; you can redistribute it and/or modify it - * under the terms and conditions of the GNU General Public License, - * version 2, as published by the Free Software Foundation. - * - * This program is distributed in the hope it will be useful, but WITHOUT - * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or - * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for - * more details. - * - */ -#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt - -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/topology.h> -#include <linux/workqueue.h> -#include <linux/cpuhotplug.h> -#include <linux/cpufeature.h> -#include <asm/cpu_device_id.h> -#include <asm/intel-family.h> - -#define MSR_OC_MAILBOX 0x150 -#define MSR_OC_MAILBOX_CMD_OFFSET 32 -#define MSR_OC_MAILBOX_RSP_OFFSET 32 -#define MSR_OC_MAILBOX_BUSY_BIT 63 -#define OC_MAILBOX_FC_CONTROL_CMD 0x1C - -/* - * 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 2 - -static int get_oc_core_priority(unsigned int cpu) -{ - u64 value, cmd = OC_MAILBOX_FC_CONTROL_CMD; - int ret, i; - - /* Issue favored core read command */ - value = cmd << MSR_OC_MAILBOX_CMD_OFFSET; - /* Set the busy bit to indicate OS is trying to issue command */ - value |= BIT_ULL(MSR_OC_MAILBOX_BUSY_BIT); - ret = wrmsrl_safe(MSR_OC_MAILBOX, value); - if (ret) { - pr_debug("cpu %d OC mailbox write failed\n", cpu); - return ret; - } - - for (i = 0; i < OC_MAILBOX_RETRY_COUNT; ++i) { - ret = rdmsrl_safe(MSR_OC_MAILBOX, &value); - if (ret) { - pr_debug("cpu %d OC mailbox read failed\n", cpu); - break; - } - - if (value & BIT_ULL(MSR_OC_MAILBOX_BUSY_BIT)) { - pr_debug("cpu %d OC mailbox still processing\n", cpu); - ret = -EBUSY; - continue; - } - - if ((value >> MSR_OC_MAILBOX_RSP_OFFSET) & 0xff) { - pr_debug("cpu %d OC mailbox cmd failed\n", cpu); - ret = -ENXIO; - break; - } - - ret = value & 0xff; - pr_debug("cpu %d max_ratio %d\n", cpu, ret); - break; - } - - return ret; -} - -/* - * 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) -{ - sched_set_itmt_support(); -} - -static DECLARE_WORK(sched_itmt_work, itmt_legacy_work_fn); - -static int itmt_legacy_cpu_online(unsigned int cpu) -{ - static u32 max_highest_perf = 0, min_highest_perf = U32_MAX; - int priority; - - priority = get_oc_core_priority(cpu); - if (priority < 0) - return 0; - - sched_set_itmt_core_prio(priority, cpu); - - /* Enable ITMT feature when a core with different priority is found */ - if (max_highest_perf <= min_highest_perf) { - if (priority > max_highest_perf) - max_highest_perf = priority; - - if (priority < min_highest_perf) - min_highest_perf = priority; - - if (max_highest_perf > min_highest_perf) - schedule_work(&sched_itmt_work); - } - - return 0; -} - -#define ICPU(model) { X86_VENDOR_INTEL, 6, model, X86_FEATURE_ANY, } - -static const struct x86_cpu_id itmt_legacy_cpu_ids[] = { - ICPU(INTEL_FAM6_BROADWELL_X), - {} -}; - -static int __init itmt_legacy_init(void) -{ - const struct x86_cpu_id *id; - int ret; - - id = x86_match_cpu(itmt_legacy_cpu_ids); - if (!id) - return -ENODEV; - - if (boot_cpu_has(X86_FEATURE_HWP)) - return -ENODEV; - - ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, - "platform/x86/turbo_max_3:online", - itmt_legacy_cpu_online, NULL); - if (ret < 0) - return ret; - - return 0; -} -late_initcall(itmt_legacy_init) |