forked from luck/tmp_suning_uos_patched
415bb699d7
Resource tracking of XRCD objects is not implemented in current
version of restrack and hence can be removed.
Fixes: 02d8883f52 ("RDMA/restrack: Add general infrastructure to track RDMA resources")
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
154 lines
3.5 KiB
C
154 lines
3.5 KiB
C
/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
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/*
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* Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved.
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*/
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#ifndef _RDMA_RESTRACK_H_
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#define _RDMA_RESTRACK_H_
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#include <linux/typecheck.h>
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#include <linux/rwsem.h>
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#include <linux/sched.h>
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#include <linux/kref.h>
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#include <linux/completion.h>
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/**
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* enum rdma_restrack_type - HW objects to track
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*/
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enum rdma_restrack_type {
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/**
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* @RDMA_RESTRACK_PD: Protection domain (PD)
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*/
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RDMA_RESTRACK_PD,
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/**
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* @RDMA_RESTRACK_CQ: Completion queue (CQ)
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*/
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RDMA_RESTRACK_CQ,
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/**
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* @RDMA_RESTRACK_QP: Queue pair (QP)
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*/
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RDMA_RESTRACK_QP,
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/**
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* @RDMA_RESTRACK_MAX: Last entry, used for array dclarations
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*/
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RDMA_RESTRACK_MAX
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};
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#define RDMA_RESTRACK_HASH_BITS 8
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/**
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* struct rdma_restrack_root - main resource tracking management
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* entity, per-device
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*/
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struct rdma_restrack_root {
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/*
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* @rwsem: Read/write lock to protect lists
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*/
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struct rw_semaphore rwsem;
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/**
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* @hash: global database for all resources per-device
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*/
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DECLARE_HASHTABLE(hash, RDMA_RESTRACK_HASH_BITS);
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};
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/**
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* struct rdma_restrack_entry - metadata per-entry
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*/
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struct rdma_restrack_entry {
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/**
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* @valid: validity indicator
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*
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* The entries are filled during rdma_restrack_add,
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* can be attempted to be free during rdma_restrack_del.
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*
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* As an example for that, see mlx5 QPs with type MLX5_IB_QPT_HW_GSI
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*/
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bool valid;
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/*
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* @kref: Protect destroy of the resource
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*/
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struct kref kref;
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/*
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* @comp: Signal that all consumers of resource are completed their work
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*/
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struct completion comp;
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/**
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* @task: owner of resource tracking entity
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*
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* There are two types of entities: created by user and created
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* by kernel.
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*
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* This is relevant for the entities created by users.
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* For the entities created by kernel, this pointer will be NULL.
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*/
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struct task_struct *task;
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/**
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* @kern_name: name of owner for the kernel created entities.
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*/
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const char *kern_name;
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/**
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* @node: hash table entry
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*/
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struct hlist_node node;
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/**
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* @type: various objects in restrack database
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*/
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enum rdma_restrack_type type;
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};
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/**
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* rdma_restrack_init() - initialize resource tracking
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* @res: resource tracking root
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*/
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void rdma_restrack_init(struct rdma_restrack_root *res);
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/**
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* rdma_restrack_clean() - clean resource tracking
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* @res: resource tracking root
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*/
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void rdma_restrack_clean(struct rdma_restrack_root *res);
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/**
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* rdma_restrack_count() - the current usage of specific object
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* @res: resource entry
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* @type: actual type of object to operate
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* @ns: PID namespace
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*/
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int rdma_restrack_count(struct rdma_restrack_root *res,
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enum rdma_restrack_type type,
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struct pid_namespace *ns);
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/**
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* rdma_restrack_add() - add object to the reource tracking database
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* @res: resource entry
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*/
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void rdma_restrack_add(struct rdma_restrack_entry *res);
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/**
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* rdma_restrack_del() - delete object from the reource tracking database
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* @res: resource entry
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* @type: actual type of object to operate
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*/
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void rdma_restrack_del(struct rdma_restrack_entry *res);
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/**
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* rdma_is_kernel_res() - check the owner of resource
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* @res: resource entry
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*/
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static inline bool rdma_is_kernel_res(struct rdma_restrack_entry *res)
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{
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return !res->task;
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}
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/**
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* rdma_restrack_get() - grab to protect resource from release
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* @res: resource entry
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*/
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int __must_check rdma_restrack_get(struct rdma_restrack_entry *res);
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/**
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* rdma_restrack_put() - relase resource
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* @res: resource entry
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*/
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int rdma_restrack_put(struct rdma_restrack_entry *res);
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#endif /* _RDMA_RESTRACK_H_ */
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