cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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intel_soc_dts_thermal.c (3185B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * intel_soc_dts_thermal.c
      4 * Copyright (c) 2014, Intel Corporation.
      5 */
      6
      7#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
      8
      9#include <linux/acpi.h>
     10#include <linux/module.h>
     11#include <linux/interrupt.h>
     12#include <asm/cpu_device_id.h>
     13#include <asm/intel-family.h>
     14#include "intel_soc_dts_iosf.h"
     15
     16#define CRITICAL_OFFSET_FROM_TJ_MAX	5000
     17
     18static int crit_offset = CRITICAL_OFFSET_FROM_TJ_MAX;
     19module_param(crit_offset, int, 0644);
     20MODULE_PARM_DESC(crit_offset,
     21	"Critical Temperature offset from tj max in millidegree Celsius.");
     22
     23/* IRQ 86 is a fixed APIC interrupt for BYT DTS Aux threshold notifications */
     24#define BYT_SOC_DTS_APIC_IRQ	86
     25
     26static int soc_dts_thres_gsi;
     27static int soc_dts_thres_irq;
     28static struct intel_soc_dts_sensors *soc_dts;
     29
     30static irqreturn_t soc_irq_thread_fn(int irq, void *dev_data)
     31{
     32	pr_debug("proc_thermal_interrupt\n");
     33	intel_soc_dts_iosf_interrupt_handler(soc_dts);
     34
     35	return IRQ_HANDLED;
     36}
     37
     38static const struct x86_cpu_id soc_thermal_ids[] = {
     39	X86_MATCH_INTEL_FAM6_MODEL(ATOM_SILVERMONT, BYT_SOC_DTS_APIC_IRQ),
     40	{}
     41};
     42MODULE_DEVICE_TABLE(x86cpu, soc_thermal_ids);
     43
     44static int __init intel_soc_thermal_init(void)
     45{
     46	int err = 0;
     47	const struct x86_cpu_id *match_cpu;
     48
     49	match_cpu = x86_match_cpu(soc_thermal_ids);
     50	if (!match_cpu)
     51		return -ENODEV;
     52
     53	/* Create a zone with 2 trips with marked as read only */
     54	soc_dts = intel_soc_dts_iosf_init(INTEL_SOC_DTS_INTERRUPT_APIC, 2, 1);
     55	if (IS_ERR(soc_dts)) {
     56		err = PTR_ERR(soc_dts);
     57		return err;
     58	}
     59
     60	soc_dts_thres_gsi = (int)match_cpu->driver_data;
     61	if (soc_dts_thres_gsi) {
     62		/*
     63		 * Note the flags here MUST match the firmware defaults, rather
     64		 * then the request_irq flags, otherwise we get an EBUSY error.
     65		 */
     66		soc_dts_thres_irq = acpi_register_gsi(NULL, soc_dts_thres_gsi,
     67						      ACPI_LEVEL_SENSITIVE,
     68						      ACPI_ACTIVE_LOW);
     69		if (soc_dts_thres_irq < 0) {
     70			pr_warn("intel_soc_dts: Could not get IRQ for GSI %d, err %d\n",
     71				soc_dts_thres_gsi, soc_dts_thres_irq);
     72			soc_dts_thres_irq = 0;
     73		}
     74	}
     75
     76	if (soc_dts_thres_irq) {
     77		err = request_threaded_irq(soc_dts_thres_irq, NULL,
     78					   soc_irq_thread_fn,
     79					   IRQF_TRIGGER_RISING | IRQF_ONESHOT,
     80					   "soc_dts", soc_dts);
     81		if (err) {
     82			/*
     83			 * Do not just error out because the user space thermal
     84			 * daemon such as DPTF may use polling instead of being
     85			 * interrupt driven.
     86			 */
     87			pr_warn("request_threaded_irq ret %d\n", err);
     88		}
     89	}
     90
     91	err = intel_soc_dts_iosf_add_read_only_critical_trip(soc_dts,
     92							     crit_offset);
     93	if (err)
     94		goto error_trips;
     95
     96	return 0;
     97
     98error_trips:
     99	if (soc_dts_thres_irq) {
    100		free_irq(soc_dts_thres_irq, soc_dts);
    101		acpi_unregister_gsi(soc_dts_thres_gsi);
    102	}
    103	intel_soc_dts_iosf_exit(soc_dts);
    104
    105	return err;
    106}
    107
    108static void __exit intel_soc_thermal_exit(void)
    109{
    110	if (soc_dts_thres_irq) {
    111		free_irq(soc_dts_thres_irq, soc_dts);
    112		acpi_unregister_gsi(soc_dts_thres_gsi);
    113	}
    114	intel_soc_dts_iosf_exit(soc_dts);
    115}
    116
    117module_init(intel_soc_thermal_init)
    118module_exit(intel_soc_thermal_exit)
    119
    120MODULE_DESCRIPTION("Intel SoC DTS Thermal Driver");
    121MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
    122MODULE_LICENSE("GPL v2");