// SPDX-License-Identifier: GPL-2.0
/*
* Data Access Monitor
*
* Author: SeongJae Park <sjpark@amazon.de>
*/
#define pr_fmt(fmt) "damon: " fmt
#include <linux/damon.h>
#include <linux/delay.h>
#include <linux/kthread.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/string.h>
#define CREATE_TRACE_POINTS
#include <trace/events/damon.h>
#ifdef CONFIG_DAMON_KUNIT_TEST
#undef DAMON_MIN_REGION
#define DAMON_MIN_REGION 1
#endif
static DEFINE_MUTEX(damon_lock);
static int nr_running_ctxs;
static bool running_exclusive_ctxs;
static DEFINE_MUTEX(damon_ops_lock);
static struct damon_operations damon_registered_ops[NR_DAMON_OPS];
static struct kmem_cache *damon_region_cache __ro_after_init;
/* Should be called under damon_ops_lock with id smaller than NR_DAMON_OPS */
static bool __damon_is_registered_ops(enum damon_ops_id id)
{
struct damon_operations empty_ops = {};
if (!memcmp(&empty_ops, &damon_registered_ops[id], sizeof(empty_ops)))
return false;
return true;
}
/**
* damon_is_registered_ops() - Check if a given damon_operations is registered.
* @id: Id of the damon_operations to check if registered.
*
* Return: true if the ops is set, false otherwise.
*/
bool damon_is_registered_ops(enum damon_ops_id id)
{
bool registered;
if (id >= NR_DAMON_OPS)
return false;
mutex_lock(&damon_ops_lock);
registered = __damon_is_registered_ops(id);
mutex_unlock(&damon_ops_lock);
return registered;
}
/**
* damon_register_ops() - Register a monitoring operations set to DAMON.
* @ops: monitoring operations set to register.
*
* This function registers a monitoring operations set of valid &struct
* damon_operations->id so that others can find and use them later.
*
* Return: 0 on success, negative error code otherwise.
*/
int damon_register_ops(struct damon_operations</