mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 15:15:15 +07:00
02da375097
As preparation to hide rdma_restrack_root, refactor the code to use the ops structure instead of a special callback which is hidden in rdma_restrack_root. Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
260 lines
5.7 KiB
C
260 lines
5.7 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
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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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#include <rdma/rdma_cm.h>
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#include <rdma/ib_verbs.h>
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#include <rdma/restrack.h>
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#include <linux/mutex.h>
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#include <linux/sched/task.h>
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#include <linux/pid_namespace.h>
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#include "cma_priv.h"
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/**
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* rdma_restrack_init() - initialize resource tracking
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* @dev: IB device
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*/
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void rdma_restrack_init(struct ib_device *dev)
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{
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struct rdma_restrack_root *res = &dev->res;
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init_rwsem(&res->rwsem);
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}
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static const char *type2str(enum rdma_restrack_type type)
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{
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static const char * const names[RDMA_RESTRACK_MAX] = {
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[RDMA_RESTRACK_PD] = "PD",
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[RDMA_RESTRACK_CQ] = "CQ",
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[RDMA_RESTRACK_QP] = "QP",
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[RDMA_RESTRACK_CM_ID] = "CM_ID",
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[RDMA_RESTRACK_MR] = "MR",
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[RDMA_RESTRACK_CTX] = "CTX",
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};
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return names[type];
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};
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/**
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* rdma_restrack_clean() - clean resource tracking
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* @dev: IB device
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*/
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void rdma_restrack_clean(struct ib_device *dev)
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{
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struct rdma_restrack_root *res = &dev->res;
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struct rdma_restrack_entry *e;
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char buf[TASK_COMM_LEN];
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const char *owner;
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int bkt;
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if (hash_empty(res->hash))
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return;
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dev = container_of(res, struct ib_device, res);
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pr_err("restrack: %s", CUT_HERE);
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dev_err(&dev->dev, "BUG: RESTRACK detected leak of resources\n");
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hash_for_each(res->hash, bkt, e, node) {
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if (rdma_is_kernel_res(e)) {
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owner = e->kern_name;
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} else {
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/*
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* There is no need to call get_task_struct here,
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* because we can be here only if there are more
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* get_task_struct() call than put_task_struct().
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*/
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get_task_comm(buf, e->task);
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owner = buf;
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}
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pr_err("restrack: %s %s object allocated by %s is not freed\n",
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rdma_is_kernel_res(e) ? "Kernel" : "User",
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type2str(e->type), owner);
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}
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pr_err("restrack: %s", CUT_HERE);
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}
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/**
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* rdma_restrack_count() - the current usage of specific object
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* @dev: IB device
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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 ib_device *dev, enum rdma_restrack_type type,
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struct pid_namespace *ns)
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{
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struct rdma_restrack_root *res = &dev->res;
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struct rdma_restrack_entry *e;
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u32 cnt = 0;
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down_read(&res->rwsem);
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hash_for_each_possible(res->hash, e, node, type) {
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if (ns == &init_pid_ns ||
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(!rdma_is_kernel_res(e) &&
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ns == task_active_pid_ns(e->task)))
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cnt++;
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}
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up_read(&res->rwsem);
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return cnt;
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}
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EXPORT_SYMBOL(rdma_restrack_count);
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static void set_kern_name(struct rdma_restrack_entry *res)
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{
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struct ib_pd *pd;
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switch (res->type) {
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case RDMA_RESTRACK_QP:
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pd = container_of(res, struct ib_qp, res)->pd;
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if (!pd) {
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WARN_ONCE(true, "XRC QPs are not supported\n");
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/* Survive, despite the programmer's error */
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res->kern_name = " ";
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}
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break;
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case RDMA_RESTRACK_MR:
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pd = container_of(res, struct ib_mr, res)->pd;
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break;
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default:
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/* Other types set kern_name directly */
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pd = NULL;
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break;
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}
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if (pd)
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res->kern_name = pd->res.kern_name;
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}
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static struct ib_device *res_to_dev(struct rdma_restrack_entry *res)
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{
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switch (res->type) {
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case RDMA_RESTRACK_PD:
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return container_of(res, struct ib_pd, res)->device;
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case RDMA_RESTRACK_CQ:
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return container_of(res, struct ib_cq, res)->device;
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case RDMA_RESTRACK_QP:
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return container_of(res, struct ib_qp, res)->device;
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case RDMA_RESTRACK_CM_ID:
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return container_of(res, struct rdma_id_private,
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res)->id.device;
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case RDMA_RESTRACK_MR:
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return container_of(res, struct ib_mr, res)->device;
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case RDMA_RESTRACK_CTX:
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return container_of(res, struct ib_ucontext, res)->device;
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default:
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WARN_ONCE(true, "Wrong resource tracking type %u\n", res->type);
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return NULL;
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}
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}
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void rdma_restrack_set_task(struct rdma_restrack_entry *res,
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const char *caller)
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{
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if (caller) {
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res->kern_name = caller;
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return;
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}
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if (res->task)
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put_task_struct(res->task);
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get_task_struct(current);
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res->task = current;
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}
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EXPORT_SYMBOL(rdma_restrack_set_task);
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static void rdma_restrack_add(struct rdma_restrack_entry *res)
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{
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struct ib_device *dev = res_to_dev(res);
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if (!dev)
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return;
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kref_init(&res->kref);
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init_completion(&res->comp);
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res->valid = true;
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down_write(&dev->res.rwsem);
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hash_add(dev->res.hash, &res->node, res->type);
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up_write(&dev->res.rwsem);
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}
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/**
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* rdma_restrack_kadd() - add kernel object to the reource tracking database
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* @res: resource entry
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*/
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void rdma_restrack_kadd(struct rdma_restrack_entry *res)
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{
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res->task = NULL;
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set_kern_name(res);
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res->user = false;
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rdma_restrack_add(res);
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}
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EXPORT_SYMBOL(rdma_restrack_kadd);
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/**
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* rdma_restrack_uadd() - add user object to the reource tracking database
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* @res: resource entry
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*/
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void rdma_restrack_uadd(struct rdma_restrack_entry *res)
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{
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if (res->type != RDMA_RESTRACK_CM_ID)
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res->task = NULL;
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if (!res->task)
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rdma_restrack_set_task(res, NULL);
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res->kern_name = NULL;
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res->user = true;
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rdma_restrack_add(res);
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}
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EXPORT_SYMBOL(rdma_restrack_uadd);
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int __must_check rdma_restrack_get(struct rdma_restrack_entry *res)
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{
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return kref_get_unless_zero(&res->kref);
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}
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EXPORT_SYMBOL(rdma_restrack_get);
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static void restrack_release(struct kref *kref)
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{
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struct rdma_restrack_entry *res;
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res = container_of(kref, struct rdma_restrack_entry, kref);
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complete(&res->comp);
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}
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int rdma_restrack_put(struct rdma_restrack_entry *res)
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{
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return kref_put(&res->kref, restrack_release);
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}
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EXPORT_SYMBOL(rdma_restrack_put);
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void rdma_restrack_del(struct rdma_restrack_entry *res)
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{
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struct ib_device *dev;
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if (!res->valid)
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goto out;
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dev = res_to_dev(res);
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if (!dev)
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return;
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rdma_restrack_put(res);
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wait_for_completion(&res->comp);
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down_write(&dev->res.rwsem);
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hash_del(&res->node);
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res->valid = false;
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up_write(&dev->res.rwsem);
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out:
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if (res->task) {
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put_task_struct(res->task);
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res->task = NULL;
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}
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}
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EXPORT_SYMBOL(rdma_restrack_del);
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