linux/drivers/misc/vcpu_stall_detector.c

// SPDX-License-Identifier: GPL-2.0-only
//
// VCPU stall detector.
//  Copyright (C) Google, 2022

#include <linux/cpu.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>

#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/nmi.h>
#include <linux/of.h>
#include <linux/param.h>
#include <linux/percpu.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#define VCPU_STALL_REG_STATUS …
#define VCPU_STALL_REG_LOAD_CNT …
#define VCPU_STALL_REG_CURRENT_CNT …
#define VCPU_STALL_REG_CLOCK_FREQ_HZ …
#define VCPU_STALL_REG_LEN …

#define VCPU_STALL_DEFAULT_CLOCK_HZ …
#define VCPU_STALL_MAX_CLOCK_HZ …
#define VCPU_STALL_DEFAULT_TIMEOUT_SEC …
#define VCPU_STALL_MAX_TIMEOUT_SEC …

struct vcpu_stall_detect_config { … };

struct vcpu_stall_priv { … };

/* The vcpu stall configuration structure which applies to all the CPUs */
static struct vcpu_stall_detect_config vcpu_stall_config;

#define vcpu_stall_reg_write(vcpu, reg, value) …


static struct vcpu_stall_priv __percpu *vcpu_stall_detectors;

static enum hrtimer_restart
vcpu_stall_detect_timer_fn(struct hrtimer *hrtimer)
{ … }

static irqreturn_t vcpu_stall_detector_irq(int irq, void *dev)
{ … }

static int start_stall_detector_cpu(unsigned int cpu)
{ … }

static int stop_stall_detector_cpu(unsigned int cpu)
{ … }

static int vcpu_stall_detect_probe(struct platform_device *pdev)
{ … }

static void vcpu_stall_detect_remove(struct platform_device *pdev)
{ … }

static const struct of_device_id vcpu_stall_detect_of_match[] = …;

MODULE_DEVICE_TABLE(of, vcpu_stall_detect_of_match);

static struct platform_driver vcpu_stall_detect_driver = …;

module_platform_driver(…) …;

MODULE_LICENSE(…) …;
MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;