linux-imx

// SPDX-License-Identifier: GPL-2.0+

/*

 * Copyright (C) 2007 Alan Stern

 * Copyright (C) IBM Corporation, 2009

 * Copyright (C) 2009, Frederic Weisbecker <fweisbec@gmail.com>

 *

 * Thanks to Ingo Molnar for his many suggestions.

 *

 * Authors: Alan Stern <stern@rowland.harvard.edu>

 *          K.Prasad <prasad@linux.vnet.ibm.com>

 *          Frederic Weisbecker <fweisbec@gmail.com>

 */

​

/*

 * HW_breakpoint: a unified kernel/user-space hardware breakpoint facility,

 * using the CPU's debug registers.

 * This file contains the arch-independent routines.

 */

​

#include <linux/irqflags.h>

#include <linux/kallsyms.h>

#include <linux/notifier.h>

#include <linux/kprobes.h>

#include <linux/kdebug.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/percpu.h>

#include <linux/sched.h>

#include <linux/init.h>

#include <linux/slab.h>

#include <linux/list.h>

#include <linux/cpu.h>

#include <linux/smp.h>

#include <linux/bug.h>

​

#include <linux/hw_breakpoint.h>

/*

 * Constraints data

 */

struct bp_cpuinfo {

    /* Number of pinned cpu breakpoints in a cpu */

    unsigned int    cpu_pinned;

    /* tsk_pinned[n] is the number of tasks having n+1 breakpoints */

    unsigned int    *tsk_pinned;

    /* Number of non-pinned cpu/task breakpoints in a cpu */

    unsigned int    flexible; /* XXX: placeholder, see fetch_this_slot() */

};

​

static DEFINE_PER_CPU(struct bp_cpuinfo, bp_cpuinfo[TYPE_MAX]);

static int nr_slots[TYPE_MAX];

​

static struct bp_cpuinfo *get_bp_info(int cpu, enum bp_type_idx type)

{

    return per_cpu_ptr(bp_cpuinfo + type, cpu);

}

​

/* Keep track of the breakpoints attached to tasks */

static LIST_HEAD(bp_task_head);

​

static int constraints_initialized;

​

/* Gather the number of total pinned and un-pinned bp in a cpuset */

struct bp_busy_slots {