linux/drivers/infiniband/core/restrack.c

// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
 * Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved.
 */

#include <rdma/rdma_cm.h>
#include <rdma/ib_verbs.h>
#include <rdma/restrack.h>
#include <rdma/rdma_counter.h>
#include <linux/mutex.h>
#include <linux/sched/task.h>
#include <linux/pid_namespace.h>

#include "cma_priv.h"
#include "restrack.h"

/**
 * rdma_restrack_init() - initialize and allocate resource tracking
 * @dev:  IB device
 *
 * Return: 0 on success
 */
int rdma_restrack_init(struct ib_device *dev)
{ … }

/**
 * rdma_restrack_clean() - clean resource tracking
 * @dev:  IB device
 */
void rdma_restrack_clean(struct ib_device *dev)
{ … }

/**
 * rdma_restrack_count() - the current usage of specific object
 * @dev:  IB device
 * @type: actual type of object to operate
 * @show_details: count driver specific objects
 */
int rdma_restrack_count(struct ib_device *dev, enum rdma_restrack_type type,
			bool show_details)
{ … }
EXPORT_SYMBOL(…);

static struct ib_device *res_to_dev(struct rdma_restrack_entry *res)
{ … }

/**
 * rdma_restrack_attach_task() - attach the task onto this resource,
 * valid for user space restrack entries.
 * @res:  resource entry
 * @task: the task to attach
 */
static void rdma_restrack_attach_task(struct rdma_restrack_entry *res,
				      struct task_struct *task)
{ … }

/**
 * rdma_restrack_set_name() - set the task for this resource
 * @res:  resource entry
 * @caller: kernel name, the current task will be used if the caller is NULL.
 */
void rdma_restrack_set_name(struct rdma_restrack_entry *res, const char *caller)
{ … }
EXPORT_SYMBOL(…);

/**
 * rdma_restrack_parent_name() - set the restrack name properties based
 * on parent restrack
 * @dst: destination resource entry
 * @parent: parent resource entry
 */
void rdma_restrack_parent_name(struct rdma_restrack_entry *dst,
			       const struct rdma_restrack_entry *parent)
{ … }
EXPORT_SYMBOL(…);

/**
 * rdma_restrack_new() - Initializes new restrack entry to allow _put() interface
 * to release memory in fully automatic way.
 * @res: Entry to initialize
 * @type: REstrack type
 */
void rdma_restrack_new(struct rdma_restrack_entry *res,
		       enum rdma_restrack_type type)
{ … }
EXPORT_SYMBOL(…);

/**
 * rdma_restrack_add() - add object to the reource tracking database
 * @res:  resource entry
 */
void rdma_restrack_add(struct rdma_restrack_entry *res)
{ … }
EXPORT_SYMBOL(…);

int __must_check rdma_restrack_get(struct rdma_restrack_entry *res)
{ … }
EXPORT_SYMBOL(…);

/**
 * rdma_restrack_get_byid() - translate from ID to restrack object
 * @dev: IB device
 * @type: resource track type
 * @id: ID to take a look
 *
 * Return: Pointer to restrack entry or -ENOENT in case of error.
 */
struct rdma_restrack_entry *
rdma_restrack_get_byid(struct ib_device *dev,
		       enum rdma_restrack_type type, u32 id)
{ … }
EXPORT_SYMBOL(…);

static void restrack_release(struct kref *kref)
{ … }

int rdma_restrack_put(struct rdma_restrack_entry *res)
{ … }
EXPORT_SYMBOL(…);

/**
 * rdma_restrack_del() - delete object from the reource tracking database
 * @res:  resource entry
 */
void rdma_restrack_del(struct rdma_restrack_entry *res)
{ … }
EXPORT_SYMBOL(…);