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/* SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) */
/*
* Copyright (c) 2017-2018 Mellanox Technologies. All rights reserved.
*/
#include <rdma/rdma_cm.h>
#include <rdma/ib_verbs.h>
#include <rdma/restrack.h>
#include <linux/mutex.h>
#include <linux/sched/task.h>
#include <linux/pid_namespace.h>
#include "cma_priv.h"
static int fill_res_noop(struct sk_buff *msg,
struct rdma_restrack_entry *entry)
{
return 0;
}
void rdma_restrack_init(struct rdma_restrack_root *res)
{
init_rwsem(&res->rwsem);
res->fill_res_entry = fill_res_noop;
}
static const char *type2str(enum rdma_restrack_type type)
{
static const char * const names[RDMA_RESTRACK_MAX] = {
[RDMA_RESTRACK_PD] = "PD",
[RDMA_RESTRACK_CQ] = "CQ",
[RDMA_RESTRACK_QP] = "QP",
[RDMA_RESTRACK_CM_ID] = "CM_ID",
[RDMA_RESTRACK_MR] = "MR",
};
return names[type];
};
void rdma_restrack_clean(struct rdma_restrack_root *res)
{
struct rdma_restrack_entry *e;
char buf[TASK_COMM_LEN];
struct ib_device *dev;
const char *owner;
int bkt;
if (hash_empty(res->hash))
return;
dev = container_of(res, struct ib_device, res);
pr_err("restrack: %s", CUT_HERE);
pr_err("restrack: BUG: RESTRACK detected leak of resources on %s\n",
dev->name);
hash_for_each(res->hash, bkt, e, node) {
if (rdma_is_kernel_res(e)) {
owner = e->kern_name;
} else {
/*
* There is no need to call get_task_struct here,
* because we can be here only if there are more
* get_task_struct() call than put_task_struct().
*/
get_task_comm(buf, e->task);
owner = buf;
}
pr_err("restrack: %s %s object allocated by %s is not freed\n",
rdma_is_kernel_res(e) ? "Kernel" : "User",
type2str(e->type), owner);
}
pr_err("restrack: %s", CUT_HERE);
}
int rdma_restrack_count(struct rdma_restrack_root *res,
enum rdma_restrack_type type,
struct pid_namespace *ns)
{
struct rdma_restrack_entry *e;
u32 cnt = 0;
down_read(&res->rwsem);
hash_for_each_possible(res->hash, e, node, type) {
if (ns == &init_pid_ns ||
(!rdma_is_kernel_res(e) &&
ns == task_active_pid_ns(e->task)))
cnt++;
}
up_read(&res->rwsem);
return cnt;
}
EXPORT_SYMBOL(rdma_restrack_count);
static void set_kern_name(struct rdma_restrack_entry *res)
{
struct ib_pd *pd;
switch (res->type) {
case RDMA_RESTRACK_QP:
pd = container_of(res, struct ib_qp, res)->pd;
if (!pd) {
WARN_ONCE(true, "XRC QPs are not supported\n");
/* Survive, despite the programmer's error */
res->kern_name = " ";
}
break;
case RDMA_RESTRACK_MR:
pd = container_of(res, struct ib_mr, res)->pd;
break;
default:
/* Other types set kern_name directly */
pd = NULL;
break;
}
if (pd)
res->kern_name = pd->res.kern_name;
}
static struct ib_device *res_to_dev(struct rdma_restrack_entry *res)
{
switch (res->type) {
case RDMA_RESTRACK_PD:
return container_of(res, struct ib_pd, res)->device;
case RDMA_RESTRACK_CQ:
return container_of(res, struct ib_cq, res)->device;
case RDMA_RESTRACK_QP:
return container_of(res, struct ib_qp, res)->device;
case RDMA_RESTRACK_CM_ID:
return container_of(res, struct rdma_id_private,
res)->id.device;
case RDMA_RESTRACK_MR:
return container_of(res, struct ib_mr, res)->device;
default:
WARN_ONCE(true, "Wrong resource tracking type %u\n", res->type);
return NULL;
}
}
static bool res_is_user(struct rdma_restrack_entry *res)
{
switch (res->type) {
case RDMA_RESTRACK_PD:
return container_of(res, struct ib_pd, res)->uobject;
case RDMA_RESTRACK_CQ:
return container_of(res, struct ib_cq, res)->uobject;
case RDMA_RESTRACK_QP:
return container_of(res, struct ib_qp, res)->uobject;
case RDMA_RESTRACK_CM_ID:
return !res->kern_name;
case RDMA_RESTRACK_MR:
return container_of(res, struct ib_mr, res)->pd->uobject;
default:
WARN_ONCE(true, "Wrong resource tracking type %u\n", res->type);
return false;
}
}
void rdma_restrack_add(struct rdma_restrack_entry *res)
{
struct ib_device *dev = res_to_dev(res);
if (!dev)
return;
if (res->type != RDMA_RESTRACK_CM_ID || !res_is_user(res))
res->task = NULL;
if (res_is_user(res)) {
if (!res->task)
rdma_restrack_set_task(res, current);
res->kern_name = NULL;
} else {
set_kern_name(res);
}
kref_init(&res->kref);
init_completion(&res->comp);
res->valid = true;
down_write(&dev->res.rwsem);
hash_add(dev->res.hash, &res->node, res->type);
up_write(&dev->res.rwsem);
}
EXPORT_SYMBOL(rdma_restrack_add);
int __must_check rdma_restrack_get(struct rdma_restrack_entry *res)
{
return kref_get_unless_zero(&res->kref);
}
EXPORT_SYMBOL(rdma_restrack_get);
static void restrack_release(struct kref *kref)
{
struct rdma_restrack_entry *res;
res = container_of(kref, struct rdma_restrack_entry, kref);
complete(&res->comp);
}
int rdma_restrack_put(struct rdma_restrack_entry *res)
{
return kref_put(&res->kref, restrack_release);
}
EXPORT_SYMBOL(rdma_restrack_put);
void rdma_restrack_del(struct rdma_restrack_entry *res)
{
struct ib_device *dev;
if (!res->valid)
return;
dev = res_to_dev(res);
if (!dev)
return;
rdma_restrack_put(res);
wait_for_completion(&res->comp);
down_write(&dev->res.rwsem);
hash_del(&res->node);
res->valid = false;
if (res->task)
put_task_struct(res->task);
up_write(&dev->res.rwsem);
}
EXPORT_SYMBOL(rdma_restrack_del);
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