/* SPDX-License-Identifier: GPL-2.0 */
/*
 * KVM userfaultfd util
 *
 * Copyright (C) 2018, Red Hat, Inc.
 * Copyright (C) 2019-2022 Google LLC
 */
#include <inttypes.h>
#include <time.h>
#include <pthread.h>
#include <linux/userfaultfd.h>

#include "test_util.h"

typedef int (*uffd_handler_t)(int uffd_mode, int uffd, struct uffd_msg *msg);

struct uffd_reader_args {
        int uffd_mode;
        int uffd;
        useconds_t delay;
        uffd_handler_t handler;
        /* Holds the read end of the pipe for killing the reader. */
        int pipe;
};

struct uffd_desc {
        int uffd;
        u64 num_readers;
        /* Holds the write ends of the pipes for killing the readers. */
        int *pipefds;
        pthread_t *readers;
        struct uffd_reader_args *reader_args;
};

struct uffd_desc *uffd_setup_demand_paging(int uffd_mode, useconds_t delay,
                                           void *hva, u64 len,
                                           u64 num_readers,
                                           uffd_handler_t handler);

void uffd_stop_demand_paging(struct uffd_desc *uffd);

#ifdef PRINT_PER_PAGE_UPDATES
#define PER_PAGE_DEBUG(...) printf(__VA_ARGS__)
#else
#define PER_PAGE_DEBUG(...) _no_printf(__VA_ARGS__)
#endif

#ifdef PRINT_PER_VCPU_UPDATES
#define PER_VCPU_DEBUG(...) printf(__VA_ARGS__)
#else
#define PER_VCPU_DEBUG(...) _no_printf(__VA_ARGS__)
#endif