mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
misc: mic: SCIF open close bind and listen APIs
SCIF character device file operations and kernel APIs for opening and closing a user and kernel mode SCIF endpoint. This patch also enables binding to a SCIF port and listening for incoming SCIF connections. Reviewed-by: Nikhil Rao <nikhil.rao@intel.com> Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com> Signed-off-by: Sudeep Dutt <sudeep.dutt@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sudeep Dutt
Greg Kroah-Hartman
parent
40cb59428c
commit
e9089f43c9
10 changed files with 933 additions and 1 deletions
|
|
@ -69,3 +69,22 @@ config INTEL_MIC_CARD
|
||||||
|
|
||||||
For more information see
|
For more information see
|
||||||
<http://software.intel.com/en-us/mic-developer>.
|
<http://software.intel.com/en-us/mic-developer>.
|
||||||
|
|
||||||
|
comment "SCIF Driver"
|
||||||
|
|
||||||
|
config SCIF
|
||||||
|
tristate "SCIF Driver"
|
||||||
|
depends on 64BIT && PCI && X86 && SCIF_BUS
|
||||||
|
help
|
||||||
|
This enables SCIF Driver support for the Intel Many Integrated
|
||||||
|
Core (MIC) family of PCIe form factor coprocessor devices that
|
||||||
|
run a 64 bit Linux OS. The Symmetric Communication Interface
|
||||||
|
(SCIF (pronounced as skiff)) is a low level communications API
|
||||||
|
across PCIe currently implemented for MIC.
|
||||||
|
|
||||||
|
If you are building a host kernel with an Intel MIC device then
|
||||||
|
say M (recommended) or Y, else say N. If unsure say N.
|
||||||
|
|
||||||
|
More information about the Intel MIC family as well as the Linux
|
||||||
|
OS and tools for MIC to use with this driver are available from
|
||||||
|
<http://software.intel.com/en-us/mic-developer>.
|
||||||
|
|
|
||||||
|
|
@ -5,3 +5,4 @@
|
||||||
obj-$(CONFIG_INTEL_MIC_HOST) += host/
|
obj-$(CONFIG_INTEL_MIC_HOST) += host/
|
||||||
obj-$(CONFIG_INTEL_MIC_CARD) += card/
|
obj-$(CONFIG_INTEL_MIC_CARD) += card/
|
||||||
obj-y += bus/
|
obj-y += bus/
|
||||||
|
obj-$(CONFIG_SCIF) += scif/
|
||||||
|
|
|
||||||
15
drivers/misc/mic/scif/Makefile
Normal file
15
drivers/misc/mic/scif/Makefile
Normal file
|
|
@ -0,0 +1,15 @@
|
||||||
|
#
|
||||||
|
# Makefile - SCIF driver.
|
||||||
|
# Copyright(c) 2014, Intel Corporation.
|
||||||
|
#
|
||||||
|
obj-$(CONFIG_SCIF) += scif.o
|
||||||
|
scif-objs := scif_main.o
|
||||||
|
scif-objs += scif_peer_bus.o
|
||||||
|
scif-objs += scif_ports.o
|
||||||
|
scif-objs += scif_debugfs.o
|
||||||
|
scif-objs += scif_fd.o
|
||||||
|
scif-objs += scif_api.o
|
||||||
|
scif-objs += scif_epd.o
|
||||||
|
scif-objs += scif_rb.o
|
||||||
|
scif-objs += scif_nodeqp.o
|
||||||
|
scif-objs += scif_nm.o
|
||||||
417
drivers/misc/mic/scif/scif_api.c
Normal file
417
drivers/misc/mic/scif/scif_api.c
Normal file
|
|
@ -0,0 +1,417 @@
|
||||||
|
/*
|
||||||
|
* Intel MIC Platform Software Stack (MPSS)
|
||||||
|
*
|
||||||
|
* Copyright(c) 2014 Intel Corporation.
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or modify
|
||||||
|
* it under the terms of the GNU General Public License, version 2, as
|
||||||
|
* published by the Free Software Foundation.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that it will be useful, but
|
||||||
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||||
|
* General Public License for more details.
|
||||||
|
*
|
||||||
|
* Intel SCIF driver.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
#include <linux/scif.h>
|
||||||
|
#include "scif_main.h"
|
||||||
|
#include "scif_map.h"
|
||||||
|
|
||||||
|
static const char * const scif_ep_states[] = {
|
||||||
|
"Unbound",
|
||||||
|
"Bound",
|
||||||
|
"Listening",
|
||||||
|
"Connected",
|
||||||
|
"Connecting",
|
||||||
|
"Mapping",
|
||||||
|
"Closing",
|
||||||
|
"Close Listening",
|
||||||
|
"Disconnected",
|
||||||
|
"Zombie"};
|
||||||
|
|
||||||
|
enum conn_async_state {
|
||||||
|
ASYNC_CONN_IDLE = 1, /* ep setup for async connect */
|
||||||
|
ASYNC_CONN_INPROGRESS, /* async connect in progress */
|
||||||
|
ASYNC_CONN_FLUSH_WORK /* async work flush in progress */
|
||||||
|
};
|
||||||
|
|
||||||
|
scif_epd_t scif_open(void)
|
||||||
|
{
|
||||||
|
struct scif_endpt *ep;
|
||||||
|
|
||||||
|
might_sleep();
|
||||||
|
ep = kzalloc(sizeof(*ep), GFP_KERNEL);
|
||||||
|
if (!ep)
|
||||||
|
goto err_ep_alloc;
|
||||||
|
|
||||||
|
ep->qp_info.qp = kzalloc(sizeof(*ep->qp_info.qp), GFP_KERNEL);
|
||||||
|
if (!ep->qp_info.qp)
|
||||||
|
goto err_qp_alloc;
|
||||||
|
|
||||||
|
spin_lock_init(&ep->lock);
|
||||||
|
mutex_init(&ep->sendlock);
|
||||||
|
mutex_init(&ep->recvlock);
|
||||||
|
|
||||||
|
ep->state = SCIFEP_UNBOUND;
|
||||||
|
dev_dbg(scif_info.mdev.this_device,
|
||||||
|
"SCIFAPI open: ep %p success\n", ep);
|
||||||
|
return ep;
|
||||||
|
|
||||||
|
err_qp_alloc:
|
||||||
|
kfree(ep);
|
||||||
|
err_ep_alloc:
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(scif_open);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* scif_disconnect_ep - Disconnects the endpoint if found
|
||||||
|
* @epd: The end point returned from scif_open()
|
||||||
|
*/
|
||||||
|
static struct scif_endpt *scif_disconnect_ep(struct scif_endpt *ep)
|
||||||
|
{
|
||||||
|
struct scifmsg msg;
|
||||||
|
struct scif_endpt *fep = NULL;
|
||||||
|
struct scif_endpt *tmpep;
|
||||||
|
struct list_head *pos, *tmpq;
|
||||||
|
int err;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Wake up any threads blocked in send()/recv() before closing
|
||||||
|
* out the connection. Grabbing and releasing the send/recv lock
|
||||||
|
* will ensure that any blocked senders/receivers have exited for
|
||||||
|
* Ring 0 endpoints. It is a Ring 0 bug to call send/recv after
|
||||||
|
* close. Ring 3 endpoints are not affected since close will not
|
||||||
|
* be called while there are IOCTLs executing.
|
||||||
|
*/
|
||||||
|
wake_up_interruptible(&ep->sendwq);
|
||||||
|
wake_up_interruptible(&ep->recvwq);
|
||||||
|
mutex_lock(&ep->sendlock);
|
||||||
|
mutex_unlock(&ep->sendlock);
|
||||||
|
mutex_lock(&ep->recvlock);
|
||||||
|
mutex_unlock(&ep->recvlock);
|
||||||
|
|
||||||
|
/* Remove from the connected list */
|
||||||
|
mutex_lock(&scif_info.connlock);
|
||||||
|
list_for_each_safe(pos, tmpq, &scif_info.connected) {
|
||||||
|
tmpep = list_entry(pos, struct scif_endpt, list);
|
||||||
|
if (tmpep == ep) {
|
||||||
|
list_del(pos);
|
||||||
|
fep = tmpep;
|
||||||
|
spin_lock(&ep->lock);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
if (!fep) {
|
||||||
|
/*
|
||||||
|
* The other side has completed the disconnect before
|
||||||
|
* the end point can be removed from the list. Therefore
|
||||||
|
* the ep lock is not locked, traverse the disconnected
|
||||||
|
* list to find the endpoint and release the conn lock.
|
||||||
|
*/
|
||||||
|
list_for_each_safe(pos, tmpq, &scif_info.disconnected) {
|
||||||
|
tmpep = list_entry(pos, struct scif_endpt, list);
|
||||||
|
if (tmpep == ep) {
|
||||||
|
list_del(pos);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
mutex_unlock(&scif_info.connlock);
|
||||||
|
return NULL;
|
||||||
|
}
|
||||||
|
|
||||||
|
init_completion(&ep->discon);
|
||||||
|
msg.uop = SCIF_DISCNCT;
|
||||||
|
msg.src = ep->port;
|
||||||
|
msg.dst = ep->peer;
|
||||||
|
msg.payload[0] = (u64)ep;
|
||||||
|
msg.payload[1] = ep->remote_ep;
|
||||||
|
|
||||||
|
err = scif_nodeqp_send(ep->remote_dev, &msg);
|
||||||
|
spin_unlock(&ep->lock);
|
||||||
|
mutex_unlock(&scif_info.connlock);
|
||||||
|
|
||||||
|
if (!err)
|
||||||
|
/* Wait for the remote node to respond with SCIF_DISCNT_ACK */
|
||||||
|
wait_for_completion_timeout(&ep->discon,
|
||||||
|
SCIF_NODE_ALIVE_TIMEOUT);
|
||||||
|
return ep;
|
||||||
|
}
|
||||||
|
|
||||||
|
int scif_close(scif_epd_t epd)
|
||||||
|
{
|
||||||
|
struct scif_endpt *ep = (struct scif_endpt *)epd;
|
||||||
|
struct scif_endpt *tmpep;
|
||||||
|
struct list_head *pos, *tmpq;
|
||||||
|
enum scif_epd_state oldstate;
|
||||||
|
bool flush_conn;
|
||||||
|
|
||||||
|
dev_dbg(scif_info.mdev.this_device, "SCIFAPI close: ep %p %s\n",
|
||||||
|
ep, scif_ep_states[ep->state]);
|
||||||
|
might_sleep();
|
||||||
|
spin_lock(&ep->lock);
|
||||||
|
flush_conn = (ep->conn_async_state == ASYNC_CONN_INPROGRESS);
|
||||||
|
spin_unlock(&ep->lock);
|
||||||
|
|
||||||
|
if (flush_conn)
|
||||||
|
flush_work(&scif_info.conn_work);
|
||||||
|
|
||||||
|
spin_lock(&ep->lock);
|
||||||
|
oldstate = ep->state;
|
||||||
|
|
||||||
|
ep->state = SCIFEP_CLOSING;
|
||||||
|
|
||||||
|
switch (oldstate) {
|
||||||
|
case SCIFEP_ZOMBIE:
|
||||||
|
case SCIFEP_DISCONNECTED:
|
||||||
|
spin_unlock(&ep->lock);
|
||||||
|
/* Remove from the disconnected list */
|
||||||
|
mutex_lock(&scif_info.connlock);
|
||||||
|
list_for_each_safe(pos, tmpq, &scif_info.disconnected) {
|
||||||
|
tmpep = list_entry(pos, struct scif_endpt, list);
|
||||||
|
if (tmpep == ep) {
|
||||||
|
list_del(pos);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
mutex_unlock(&scif_info.connlock);
|
||||||
|
break;
|
||||||
|
case SCIFEP_UNBOUND:
|
||||||
|
case SCIFEP_BOUND:
|
||||||
|
case SCIFEP_CONNECTING:
|
||||||
|
spin_unlock(&ep->lock);
|
||||||
|
break;
|
||||||
|
case SCIFEP_MAPPING:
|
||||||
|
case SCIFEP_CONNECTED:
|
||||||
|
case SCIFEP_CLOSING:
|
||||||
|
{
|
||||||
|
spin_unlock(&ep->lock);
|
||||||
|
scif_disconnect_ep(ep);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
case SCIFEP_LISTENING:
|
||||||
|
case SCIFEP_CLLISTEN:
|
||||||
|
{
|
||||||
|
struct scif_conreq *conreq;
|
||||||
|
struct scifmsg msg;
|
||||||
|
struct scif_endpt *aep;
|
||||||
|
|
||||||
|
spin_unlock(&ep->lock);
|
||||||
|
spin_lock(&scif_info.eplock);
|
||||||
|
|
||||||
|
/* remove from listen list */
|
||||||
|
list_for_each_safe(pos, tmpq, &scif_info.listen) {
|
||||||
|
tmpep = list_entry(pos, struct scif_endpt, list);
|
||||||
|
if (tmpep == ep)
|
||||||
|
list_del(pos);
|
||||||
|
}
|
||||||
|
/* Remove any dangling accepts */
|
||||||
|
while (ep->acceptcnt) {
|
||||||
|
aep = list_first_entry(&ep->li_accept,
|
||||||
|
struct scif_endpt, liacceptlist);
|
||||||
|
list_del(&aep->liacceptlist);
|
||||||
|
scif_put_port(aep->port.port);
|
||||||
|
list_for_each_safe(pos, tmpq, &scif_info.uaccept) {
|
||||||
|
tmpep = list_entry(pos, struct scif_endpt,
|
||||||
|
miacceptlist);
|
||||||
|
if (tmpep == aep) {
|
||||||
|
list_del(pos);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
spin_unlock(&scif_info.eplock);
|
||||||
|
mutex_lock(&scif_info.connlock);
|
||||||
|
list_for_each_safe(pos, tmpq, &scif_info.connected) {
|
||||||
|
tmpep = list_entry(pos,
|
||||||
|
struct scif_endpt, list);
|
||||||
|
if (tmpep == aep) {
|
||||||
|
list_del(pos);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
list_for_each_safe(pos, tmpq, &scif_info.disconnected) {
|
||||||
|
tmpep = list_entry(pos,
|
||||||
|
struct scif_endpt, list);
|
||||||
|
if (tmpep == aep) {
|
||||||
|
list_del(pos);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
mutex_unlock(&scif_info.connlock);
|
||||||
|
scif_teardown_ep(aep);
|
||||||
|
spin_lock(&scif_info.eplock);
|
||||||
|
scif_add_epd_to_zombie_list(aep, SCIF_EPLOCK_HELD);
|
||||||
|
ep->acceptcnt--;
|
||||||
|
}
|
||||||
|
|
||||||
|
spin_lock(&ep->lock);
|
||||||
|
spin_unlock(&scif_info.eplock);
|
||||||
|
|
||||||
|
/* Remove and reject any pending connection requests. */
|
||||||
|
while (ep->conreqcnt) {
|
||||||
|
conreq = list_first_entry(&ep->conlist,
|
||||||
|
struct scif_conreq, list);
|
||||||
|
list_del(&conreq->list);
|
||||||
|
|
||||||
|
msg.uop = SCIF_CNCT_REJ;
|
||||||
|
msg.dst.node = conreq->msg.src.node;
|
||||||
|
msg.dst.port = conreq->msg.src.port;
|
||||||
|
msg.payload[0] = conreq->msg.payload[0];
|
||||||
|
msg.payload[1] = conreq->msg.payload[1];
|
||||||
|
/*
|
||||||
|
* No Error Handling on purpose for scif_nodeqp_send().
|
||||||
|
* If the remote node is lost we still want free the
|
||||||
|
* connection requests on the self node.
|
||||||
|
*/
|
||||||
|
scif_nodeqp_send(&scif_dev[conreq->msg.src.node],
|
||||||
|
&msg);
|
||||||
|
ep->conreqcnt--;
|
||||||
|
kfree(conreq);
|
||||||
|
}
|
||||||
|
|
||||||
|
spin_unlock(&ep->lock);
|
||||||
|
/* If a kSCIF accept is waiting wake it up */
|
||||||
|
wake_up_interruptible(&ep->conwq);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
scif_put_port(ep->port.port);
|
||||||
|
scif_teardown_ep(ep);
|
||||||
|
scif_add_epd_to_zombie_list(ep, !SCIF_EPLOCK_HELD);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(scif_close);
|
||||||
|
|
||||||
|
/**
|
||||||
|
* scif_flush() - Wakes up any blocking accepts. The endpoint will no longer
|
||||||
|
* accept new connections.
|
||||||
|
* @epd: The end point returned from scif_open()
|
||||||
|
*/
|
||||||
|
int __scif_flush(scif_epd_t epd)
|
||||||
|
{
|
||||||
|
struct scif_endpt *ep = (struct scif_endpt *)epd;
|
||||||
|
|
||||||
|
switch (ep->state) {
|
||||||
|
case SCIFEP_LISTENING:
|
||||||
|
{
|
||||||
|
ep->state = SCIFEP_CLLISTEN;
|
||||||
|
|
||||||
|
/* If an accept is waiting wake it up */
|
||||||
|
wake_up_interruptible(&ep->conwq);
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
default:
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
int scif_bind(scif_epd_t epd, u16 pn)
|
||||||
|
{
|
||||||
|
struct scif_endpt *ep = (struct scif_endpt *)epd;
|
||||||
|
int ret = 0;
|
||||||
|
int tmp;
|
||||||
|
|
||||||
|
dev_dbg(scif_info.mdev.this_device,
|
||||||
|
"SCIFAPI bind: ep %p %s requested port number %d\n",
|
||||||
|
ep, scif_ep_states[ep->state], pn);
|
||||||
|
if (pn) {
|
||||||
|
/*
|
||||||
|
* Similar to IETF RFC 1700, SCIF ports below
|
||||||
|
* SCIF_ADMIN_PORT_END can only be bound by system (or root)
|
||||||
|
* processes or by processes executed by privileged users.
|
||||||
|
*/
|
||||||
|
if (pn < SCIF_ADMIN_PORT_END && !capable(CAP_SYS_ADMIN)) {
|
||||||
|
ret = -EACCES;
|
||||||
|
goto scif_bind_admin_exit;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
spin_lock(&ep->lock);
|
||||||
|
if (ep->state == SCIFEP_BOUND) {
|
||||||
|
ret = -EINVAL;
|
||||||
|
goto scif_bind_exit;
|
||||||
|
} else if (ep->state != SCIFEP_UNBOUND) {
|
||||||
|
ret = -EISCONN;
|
||||||
|
goto scif_bind_exit;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (pn) {
|
||||||
|
tmp = scif_rsrv_port(pn);
|
||||||
|
if (tmp != pn) {
|
||||||
|
ret = -EINVAL;
|
||||||
|
goto scif_bind_exit;
|
||||||
|
}
|
||||||
|
} else {
|
||||||
|
pn = scif_get_new_port();
|
||||||
|
if (!pn) {
|
||||||
|
ret = -ENOSPC;
|
||||||
|
goto scif_bind_exit;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
ep->state = SCIFEP_BOUND;
|
||||||
|
ep->port.node = scif_info.nodeid;
|
||||||
|
ep->port.port = pn;
|
||||||
|
ep->conn_async_state = ASYNC_CONN_IDLE;
|
||||||
|
ret = pn;
|
||||||
|
dev_dbg(scif_info.mdev.this_device,
|
||||||
|
"SCIFAPI bind: bound to port number %d\n", pn);
|
||||||
|
scif_bind_exit:
|
||||||
|
spin_unlock(&ep->lock);
|
||||||
|
scif_bind_admin_exit:
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(scif_bind);
|
||||||
|
|
||||||
|
int scif_listen(scif_epd_t epd, int backlog)
|
||||||
|
{
|
||||||
|
struct scif_endpt *ep = (struct scif_endpt *)epd;
|
||||||
|
|
||||||
|
dev_dbg(scif_info.mdev.this_device,
|
||||||
|
"SCIFAPI listen: ep %p %s\n", ep, scif_ep_states[ep->state]);
|
||||||
|
spin_lock(&ep->lock);
|
||||||
|
switch (ep->state) {
|
||||||
|
case SCIFEP_ZOMBIE:
|
||||||
|
case SCIFEP_CLOSING:
|
||||||
|
case SCIFEP_CLLISTEN:
|
||||||
|
case SCIFEP_UNBOUND:
|
||||||
|
case SCIFEP_DISCONNECTED:
|
||||||
|
spin_unlock(&ep->lock);
|
||||||
|
return -EINVAL;
|
||||||
|
case SCIFEP_LISTENING:
|
||||||
|
case SCIFEP_CONNECTED:
|
||||||
|
case SCIFEP_CONNECTING:
|
||||||
|
case SCIFEP_MAPPING:
|
||||||
|
spin_unlock(&ep->lock);
|
||||||
|
return -EISCONN;
|
||||||
|
case SCIFEP_BOUND:
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
|
||||||
|
ep->state = SCIFEP_LISTENING;
|
||||||
|
ep->backlog = backlog;
|
||||||
|
|
||||||
|
ep->conreqcnt = 0;
|
||||||
|
ep->acceptcnt = 0;
|
||||||
|
INIT_LIST_HEAD(&ep->conlist);
|
||||||
|
init_waitqueue_head(&ep->conwq);
|
||||||
|
INIT_LIST_HEAD(&ep->li_accept);
|
||||||
|
spin_unlock(&ep->lock);
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Listen status is complete so delete the qp information not needed
|
||||||
|
* on a listen before placing on the list of listening ep's
|
||||||
|
*/
|
||||||
|
scif_teardown_ep(ep);
|
||||||
|
ep->qp_info.qp = NULL;
|
||||||
|
|
||||||
|
spin_lock(&scif_info.eplock);
|
||||||
|
list_add_tail(&ep->list, &scif_info.listen);
|
||||||
|
spin_unlock(&scif_info.eplock);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
EXPORT_SYMBOL_GPL(scif_listen);
|
||||||
92
drivers/misc/mic/scif/scif_epd.c
Normal file
92
drivers/misc/mic/scif/scif_epd.c
Normal file
|
|
@ -0,0 +1,92 @@
|
||||||
|
/*
|
||||||
|
* Intel MIC Platform Software Stack (MPSS)
|
||||||
|
*
|
||||||
|
* Copyright(c) 2014 Intel Corporation.
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or modify
|
||||||
|
* it under the terms of the GNU General Public License, version 2, as
|
||||||
|
* published by the Free Software Foundation.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that it will be useful, but
|
||||||
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||||
|
* General Public License for more details.
|
||||||
|
*
|
||||||
|
* Intel SCIF driver.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
#include "scif_main.h"
|
||||||
|
#include "scif_map.h"
|
||||||
|
|
||||||
|
void scif_cleanup_ep_qp(struct scif_endpt *ep)
|
||||||
|
{
|
||||||
|
struct scif_qp *qp = ep->qp_info.qp;
|
||||||
|
|
||||||
|
if (qp->outbound_q.rb_base) {
|
||||||
|
scif_iounmap((void *)qp->outbound_q.rb_base,
|
||||||
|
qp->outbound_q.size, ep->remote_dev);
|
||||||
|
qp->outbound_q.rb_base = NULL;
|
||||||
|
}
|
||||||
|
if (qp->remote_qp) {
|
||||||
|
scif_iounmap((void *)qp->remote_qp,
|
||||||
|
sizeof(struct scif_qp), ep->remote_dev);
|
||||||
|
qp->remote_qp = NULL;
|
||||||
|
}
|
||||||
|
if (qp->local_qp) {
|
||||||
|
scif_unmap_single(qp->local_qp, ep->remote_dev,
|
||||||
|
sizeof(struct scif_qp));
|
||||||
|
qp->local_qp = 0x0;
|
||||||
|
}
|
||||||
|
if (qp->local_buf) {
|
||||||
|
scif_unmap_single(qp->local_buf, ep->remote_dev,
|
||||||
|
SCIF_ENDPT_QP_SIZE);
|
||||||
|
qp->local_buf = 0;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
void scif_teardown_ep(void *endpt)
|
||||||
|
{
|
||||||
|
struct scif_endpt *ep = endpt;
|
||||||
|
struct scif_qp *qp = ep->qp_info.qp;
|
||||||
|
|
||||||
|
if (qp) {
|
||||||
|
spin_lock(&ep->lock);
|
||||||
|
scif_cleanup_ep_qp(ep);
|
||||||
|
spin_unlock(&ep->lock);
|
||||||
|
kfree(qp->inbound_q.rb_base);
|
||||||
|
kfree(qp);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
/*
|
||||||
|
* Enqueue the endpoint to the zombie list for cleanup.
|
||||||
|
* The endpoint should not be accessed once this API returns.
|
||||||
|
*/
|
||||||
|
void scif_add_epd_to_zombie_list(struct scif_endpt *ep, bool eplock_held)
|
||||||
|
{
|
||||||
|
if (!eplock_held)
|
||||||
|
spin_lock(&scif_info.eplock);
|
||||||
|
spin_lock(&ep->lock);
|
||||||
|
ep->state = SCIFEP_ZOMBIE;
|
||||||
|
spin_unlock(&ep->lock);
|
||||||
|
list_add_tail(&ep->list, &scif_info.zombie);
|
||||||
|
scif_info.nr_zombies++;
|
||||||
|
if (!eplock_held)
|
||||||
|
spin_unlock(&scif_info.eplock);
|
||||||
|
schedule_work(&scif_info.misc_work);
|
||||||
|
}
|
||||||
|
|
||||||
|
void scif_cleanup_zombie_epd(void)
|
||||||
|
{
|
||||||
|
struct list_head *pos, *tmpq;
|
||||||
|
struct scif_endpt *ep;
|
||||||
|
|
||||||
|
spin_lock(&scif_info.eplock);
|
||||||
|
list_for_each_safe(pos, tmpq, &scif_info.zombie) {
|
||||||
|
ep = list_entry(pos, struct scif_endpt, list);
|
||||||
|
list_del(pos);
|
||||||
|
scif_info.nr_zombies--;
|
||||||
|
kfree(ep);
|
||||||
|
}
|
||||||
|
spin_unlock(&scif_info.eplock);
|
||||||
|
}
|
||||||
148
drivers/misc/mic/scif/scif_epd.h
Normal file
148
drivers/misc/mic/scif/scif_epd.h
Normal file
|
|
@ -0,0 +1,148 @@
|
||||||
|
/*
|
||||||
|
* Intel MIC Platform Software Stack (MPSS)
|
||||||
|
*
|
||||||
|
* Copyright(c) 2014 Intel Corporation.
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or modify
|
||||||
|
* it under the terms of the GNU General Public License, version 2, as
|
||||||
|
* published by the Free Software Foundation.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that it will be useful, but
|
||||||
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||||
|
* General Public License for more details.
|
||||||
|
*
|
||||||
|
* Intel SCIF driver.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
#ifndef SCIF_EPD_H
|
||||||
|
#define SCIF_EPD_H
|
||||||
|
|
||||||
|
#include <linux/delay.h>
|
||||||
|
#include <linux/scif.h>
|
||||||
|
#include <linux/scif_ioctl.h>
|
||||||
|
|
||||||
|
#define SCIF_EPLOCK_HELD true
|
||||||
|
|
||||||
|
enum scif_epd_state {
|
||||||
|
SCIFEP_UNBOUND,
|
||||||
|
SCIFEP_BOUND,
|
||||||
|
SCIFEP_LISTENING,
|
||||||
|
SCIFEP_CONNECTED,
|
||||||
|
SCIFEP_CONNECTING,
|
||||||
|
SCIFEP_MAPPING,
|
||||||
|
SCIFEP_CLOSING,
|
||||||
|
SCIFEP_CLLISTEN,
|
||||||
|
SCIFEP_DISCONNECTED,
|
||||||
|
SCIFEP_ZOMBIE
|
||||||
|
};
|
||||||
|
|
||||||
|
/*
|
||||||
|
* struct scif_conreq - Data structure added to the connection list.
|
||||||
|
*
|
||||||
|
* @msg: connection request message received
|
||||||
|
* @list: link to list of connection requests
|
||||||
|
*/
|
||||||
|
struct scif_conreq {
|
||||||
|
struct scifmsg msg;
|
||||||
|
struct list_head list;
|
||||||
|
};
|
||||||
|
|
||||||
|
/* Size of the RB for the Endpoint QP */
|
||||||
|
#define SCIF_ENDPT_QP_SIZE 0x1000
|
||||||
|
|
||||||
|
/*
|
||||||
|
* scif_endpt_qp_info - SCIF endpoint queue pair
|
||||||
|
*
|
||||||
|
* @qp - Qpair for this endpoint
|
||||||
|
* @qp_offset - DMA address of the QP
|
||||||
|
* @gnt_pld - Payload in a SCIF_CNCT_GNT message containing the
|
||||||
|
* physical address of the remote_qp.
|
||||||
|
*/
|
||||||
|
struct scif_endpt_qp_info {
|
||||||
|
struct scif_qp *qp;
|
||||||
|
dma_addr_t qp_offset;
|
||||||
|
dma_addr_t gnt_pld;
|
||||||
|
};
|
||||||
|
|
||||||
|
/*
|
||||||
|
* struct scif_endpt - The SCIF endpoint data structure
|
||||||
|
*
|
||||||
|
* @state: end point state
|
||||||
|
* @lock: lock synchronizing access to endpoint fields like state etc
|
||||||
|
* @port: self port information
|
||||||
|
* @peer: peer port information
|
||||||
|
* @backlog: maximum pending connection requests
|
||||||
|
* @qp_info: Endpoint QP information for SCIF messaging
|
||||||
|
* @remote_dev: scifdev used by this endpt to communicate with remote node.
|
||||||
|
* @remote_ep: remote endpoint
|
||||||
|
* @conreqcnt: Keep track of number of connection requests.
|
||||||
|
* @files: Open file information used to match the id passed in with
|
||||||
|
* the flush routine.
|
||||||
|
* @conlist: list of connection requests
|
||||||
|
* @conwq: waitqueue for connection processing
|
||||||
|
* @discon: completion used during disconnection
|
||||||
|
* @sendwq: waitqueue used during sending messages
|
||||||
|
* @recvwq: waitqueue used during message receipt
|
||||||
|
* @sendlock: Synchronize ordering of messages sent
|
||||||
|
* @recvlock: Synchronize ordering of messages received
|
||||||
|
* @list: link to list of various endpoints like connected, listening etc
|
||||||
|
* @li_accept: pending ACCEPTREG
|
||||||
|
* @acceptcnt: pending ACCEPTREG cnt
|
||||||
|
* @liacceptlist: link to listen accept
|
||||||
|
* @miacceptlist: link to uaccept
|
||||||
|
* @listenep: associated listen ep
|
||||||
|
* @conn_work: Non blocking connect work
|
||||||
|
* @conn_port: Connection port
|
||||||
|
* @conn_err: Errors during connection
|
||||||
|
* @conn_async_state: Async connection
|
||||||
|
* @conn_list: List of async connection requests
|
||||||
|
*/
|
||||||
|
struct scif_endpt {
|
||||||
|
enum scif_epd_state state;
|
||||||
|
spinlock_t lock;
|
||||||
|
struct scif_port_id port;
|
||||||
|
struct scif_port_id peer;
|
||||||
|
int backlog;
|
||||||
|
struct scif_endpt_qp_info qp_info;
|
||||||
|
struct scif_dev *remote_dev;
|
||||||
|
u64 remote_ep;
|
||||||
|
int conreqcnt;
|
||||||
|
struct files_struct *files;
|
||||||
|
struct list_head conlist;
|
||||||
|
wait_queue_head_t conwq;
|
||||||
|
struct completion discon;
|
||||||
|
wait_queue_head_t sendwq;
|
||||||
|
wait_queue_head_t recvwq;
|
||||||
|
struct mutex sendlock;
|
||||||
|
struct mutex recvlock;
|
||||||
|
struct list_head list;
|
||||||
|
struct list_head li_accept;
|
||||||
|
int acceptcnt;
|
||||||
|
struct list_head liacceptlist;
|
||||||
|
struct list_head miacceptlist;
|
||||||
|
struct scif_endpt *listenep;
|
||||||
|
struct scif_port_id conn_port;
|
||||||
|
int conn_err;
|
||||||
|
int conn_async_state;
|
||||||
|
struct list_head conn_list;
|
||||||
|
};
|
||||||
|
|
||||||
|
static inline int scifdev_alive(struct scif_endpt *ep)
|
||||||
|
{
|
||||||
|
return _scifdev_alive(ep->remote_dev);
|
||||||
|
}
|
||||||
|
|
||||||
|
void scif_cleanup_zombie_epd(void);
|
||||||
|
void scif_teardown_ep(void *endpt);
|
||||||
|
void scif_cleanup_ep_qp(struct scif_endpt *ep);
|
||||||
|
void scif_add_epd_to_zombie_list(struct scif_endpt *ep, bool eplock_held);
|
||||||
|
void scif_get_node_info(void);
|
||||||
|
void scif_send_acks(struct scif_dev *dev);
|
||||||
|
void scif_conn_handler(struct work_struct *work);
|
||||||
|
int scif_rsrv_port(u16 port);
|
||||||
|
void scif_get_port(u16 port);
|
||||||
|
int scif_get_new_port(void);
|
||||||
|
void scif_put_port(u16 port);
|
||||||
|
int __scif_flush(scif_epd_t epd);
|
||||||
|
#endif /* SCIF_EPD_H */
|
||||||
104
drivers/misc/mic/scif/scif_fd.c
Normal file
104
drivers/misc/mic/scif/scif_fd.c
Normal file
|
|
@ -0,0 +1,104 @@
|
||||||
|
/*
|
||||||
|
* Intel MIC Platform Software Stack (MPSS)
|
||||||
|
*
|
||||||
|
* Copyright(c) 2014 Intel Corporation.
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or modify
|
||||||
|
* it under the terms of the GNU General Public License, version 2, as
|
||||||
|
* published by the Free Software Foundation.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that it will be useful, but
|
||||||
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||||
|
* General Public License for more details.
|
||||||
|
*
|
||||||
|
* Intel SCIF driver.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
#include "scif_main.h"
|
||||||
|
|
||||||
|
static int scif_fdopen(struct inode *inode, struct file *f)
|
||||||
|
{
|
||||||
|
struct scif_endpt *priv = scif_open();
|
||||||
|
|
||||||
|
if (!priv)
|
||||||
|
return -ENOMEM;
|
||||||
|
f->private_data = priv;
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int scif_fdclose(struct inode *inode, struct file *f)
|
||||||
|
{
|
||||||
|
struct scif_endpt *priv = f->private_data;
|
||||||
|
|
||||||
|
return scif_close(priv);
|
||||||
|
}
|
||||||
|
|
||||||
|
static int scif_fdflush(struct file *f, fl_owner_t id)
|
||||||
|
{
|
||||||
|
struct scif_endpt *ep = f->private_data;
|
||||||
|
|
||||||
|
spin_lock(&ep->lock);
|
||||||
|
/*
|
||||||
|
* The listening endpoint stashes the open file information before
|
||||||
|
* waiting for incoming connections. The release callback would never be
|
||||||
|
* called if the application closed the endpoint, while waiting for
|
||||||
|
* incoming connections from a separate thread since the file descriptor
|
||||||
|
* reference count is bumped up in the accept IOCTL. Call the flush
|
||||||
|
* routine if the id matches the endpoint open file information so that
|
||||||
|
* the listening endpoint can be woken up and the fd released.
|
||||||
|
*/
|
||||||
|
if (ep->files == id)
|
||||||
|
__scif_flush(ep);
|
||||||
|
spin_unlock(&ep->lock);
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
static __always_inline void scif_err_debug(int err, const char *str)
|
||||||
|
{
|
||||||
|
/*
|
||||||
|
* ENOTCONN is a common uninteresting error which is
|
||||||
|
* flooding debug messages to the console unnecessarily.
|
||||||
|
*/
|
||||||
|
if (err < 0 && err != -ENOTCONN)
|
||||||
|
dev_dbg(scif_info.mdev.this_device, "%s err %d\n", str, err);
|
||||||
|
}
|
||||||
|
|
||||||
|
static long scif_fdioctl(struct file *f, unsigned int cmd, unsigned long arg)
|
||||||
|
{
|
||||||
|
struct scif_endpt *priv = f->private_data;
|
||||||
|
void __user *argp = (void __user *)arg;
|
||||||
|
bool non_block = false;
|
||||||
|
|
||||||
|
non_block = !!(f->f_flags & O_NONBLOCK);
|
||||||
|
|
||||||
|
switch (cmd) {
|
||||||
|
case SCIF_BIND:
|
||||||
|
{
|
||||||
|
int pn;
|
||||||
|
|
||||||
|
if (copy_from_user(&pn, argp, sizeof(pn)))
|
||||||
|
return -EFAULT;
|
||||||
|
|
||||||
|
pn = scif_bind(priv, pn);
|
||||||
|
if (pn < 0)
|
||||||
|
return pn;
|
||||||
|
|
||||||
|
if (copy_to_user(argp, &pn, sizeof(pn)))
|
||||||
|
return -EFAULT;
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
case SCIF_LISTEN:
|
||||||
|
return scif_listen(priv, arg);
|
||||||
|
}
|
||||||
|
return -EINVAL;
|
||||||
|
}
|
||||||
|
|
||||||
|
const struct file_operations scif_fops = {
|
||||||
|
.open = scif_fdopen,
|
||||||
|
.release = scif_fdclose,
|
||||||
|
.unlocked_ioctl = scif_fdioctl,
|
||||||
|
.flush = scif_fdflush,
|
||||||
|
.owner = THIS_MODULE,
|
||||||
|
};
|
||||||
|
|
@ -238,6 +238,8 @@ static inline int _scifdev_alive(struct scif_dev *scifdev)
|
||||||
return !!spdev;
|
return !!spdev;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
#include "scif_epd.h"
|
||||||
|
|
||||||
void __init scif_init_debugfs(void);
|
void __init scif_init_debugfs(void);
|
||||||
void scif_exit_debugfs(void);
|
void scif_exit_debugfs(void);
|
||||||
int scif_setup_intr_wq(struct scif_dev *scifdev);
|
int scif_setup_intr_wq(struct scif_dev *scifdev);
|
||||||
|
|
|
||||||
|
|
@ -64,7 +64,17 @@
|
||||||
#define SCIF_NODE_ADD_NACK 6 /* SCIF_NODE_ADD failed */
|
#define SCIF_NODE_ADD_NACK 6 /* SCIF_NODE_ADD failed */
|
||||||
#define SCIF_NODE_REMOVE 7 /* Request to deactivate a SCIF node */
|
#define SCIF_NODE_REMOVE 7 /* Request to deactivate a SCIF node */
|
||||||
#define SCIF_NODE_REMOVE_ACK 8 /* Response to a SCIF_NODE_REMOVE message */
|
#define SCIF_NODE_REMOVE_ACK 8 /* Response to a SCIF_NODE_REMOVE message */
|
||||||
#define SCIF_MAX_MSG SCIF_NODE_REMOVE_ACK
|
#define SCIF_CNCT_REQ 9 /* Phys addr of Request connection to a port */
|
||||||
|
#define SCIF_CNCT_GNT 10 /* Phys addr of new Grant connection request */
|
||||||
|
#define SCIF_CNCT_GNTACK 11 /* Error type Reject a connection request */
|
||||||
|
#define SCIF_CNCT_GNTNACK 12 /* Error type Reject a connection request */
|
||||||
|
#define SCIF_CNCT_REJ 13 /* Error type Reject a connection request */
|
||||||
|
#define SCIF_DISCNCT 14 /* Notify peer that connection is being terminated */
|
||||||
|
#define SCIF_DISCNT_ACK 15 /* Notify peer that connection is being terminated */
|
||||||
|
#define SCIF_CLIENT_SENT 16 /* Notify the peer that data has been written */
|
||||||
|
#define SCIF_CLIENT_RCVD 17 /* Notify the peer that data has been read */
|
||||||
|
#define SCIF_GET_NODE_INFO 18 /* Get current node mask from the mgmt node*/
|
||||||
|
#define SCIF_MAX_MSG SCIF_GET_NODE_INFO
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* struct scifmsg - Node QP message format
|
* struct scifmsg - Node QP message format
|
||||||
|
|
|
||||||
124
drivers/misc/mic/scif/scif_ports.c
Normal file
124
drivers/misc/mic/scif/scif_ports.c
Normal file
|
|
@ -0,0 +1,124 @@
|
||||||
|
/*
|
||||||
|
* Intel MIC Platform Software Stack (MPSS)
|
||||||
|
*
|
||||||
|
* Copyright(c) 2014 Intel Corporation.
|
||||||
|
*
|
||||||
|
* This program is free software; you can redistribute it and/or modify
|
||||||
|
* it under the terms of the GNU General Public License, version 2, as
|
||||||
|
* published by the Free Software Foundation.
|
||||||
|
*
|
||||||
|
* This program is distributed in the hope that it will be useful, but
|
||||||
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||||
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||||
|
* General Public License for more details.
|
||||||
|
*
|
||||||
|
* Intel SCIF driver.
|
||||||
|
*
|
||||||
|
*/
|
||||||
|
#include <linux/idr.h>
|
||||||
|
|
||||||
|
#include "scif_main.h"
|
||||||
|
|
||||||
|
#define SCIF_PORT_COUNT 0x10000 /* Ports available */
|
||||||
|
|
||||||
|
struct idr scif_ports;
|
||||||
|
|
||||||
|
/*
|
||||||
|
* struct scif_port - SCIF port information
|
||||||
|
*
|
||||||
|
* @ref_cnt - Reference count since there can be multiple endpoints
|
||||||
|
* created via scif_accept(..) simultaneously using a port.
|
||||||
|
*/
|
||||||
|
struct scif_port {
|
||||||
|
int ref_cnt;
|
||||||
|
};
|
||||||
|
|
||||||
|
/**
|
||||||
|
* __scif_get_port - Reserve a specified port # for SCIF and add it
|
||||||
|
* to the global list.
|
||||||
|
* @port : port # to be reserved.
|
||||||
|
*
|
||||||
|
* @return : Allocated SCIF port #, or -ENOSPC if port unavailable.
|
||||||
|
* On memory allocation failure, returns -ENOMEM.
|
||||||
|
*/
|
||||||
|
static int __scif_get_port(int start, int end)
|
||||||
|
{
|
||||||
|
int id;
|
||||||
|
struct scif_port *port = kzalloc(sizeof(*port), GFP_ATOMIC);
|
||||||
|
|
||||||
|
if (!port)
|
||||||
|
return -ENOMEM;
|
||||||
|
spin_lock(&scif_info.port_lock);
|
||||||
|
id = idr_alloc(&scif_ports, port, start, end, GFP_ATOMIC);
|
||||||
|
if (id >= 0)
|
||||||
|
port->ref_cnt++;
|
||||||
|
spin_unlock(&scif_info.port_lock);
|
||||||
|
return id;
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* scif_rsrv_port - Reserve a specified port # for SCIF.
|
||||||
|
* @port : port # to be reserved.
|
||||||
|
*
|
||||||
|
* @return : Allocated SCIF port #, or -ENOSPC if port unavailable.
|
||||||
|
* On memory allocation failure, returns -ENOMEM.
|
||||||
|
*/
|
||||||
|
int scif_rsrv_port(u16 port)
|
||||||
|
{
|
||||||
|
return __scif_get_port(port, port + 1);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* scif_get_new_port - Get and reserve any port # for SCIF in the range
|
||||||
|
* SCIF_PORT_RSVD + 1 to SCIF_PORT_COUNT - 1.
|
||||||
|
*
|
||||||
|
* @return : Allocated SCIF port #, or -ENOSPC if no ports available.
|
||||||
|
* On memory allocation failure, returns -ENOMEM.
|
||||||
|
*/
|
||||||
|
int scif_get_new_port(void)
|
||||||
|
{
|
||||||
|
return __scif_get_port(SCIF_PORT_RSVD + 1, SCIF_PORT_COUNT);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* scif_get_port - Increment the reference count for a SCIF port
|
||||||
|
* @id : SCIF port
|
||||||
|
*
|
||||||
|
* @return : None
|
||||||
|
*/
|
||||||
|
void scif_get_port(u16 id)
|
||||||
|
{
|
||||||
|
struct scif_port *port;
|
||||||
|
|
||||||
|
if (!id)
|
||||||
|
return;
|
||||||
|
spin_lock(&scif_info.port_lock);
|
||||||
|
port = idr_find(&scif_ports, id);
|
||||||
|
if (port)
|
||||||
|
port->ref_cnt++;
|
||||||
|
spin_unlock(&scif_info.port_lock);
|
||||||
|
}
|
||||||
|
|
||||||
|
/**
|
||||||
|
* scif_put_port - Release a reserved SCIF port
|
||||||
|
* @id : SCIF port to be released.
|
||||||
|
*
|
||||||
|
* @return : None
|
||||||
|
*/
|
||||||
|
void scif_put_port(u16 id)
|
||||||
|
{
|
||||||
|
struct scif_port *port;
|
||||||
|
|
||||||
|
if (!id)
|
||||||
|
return;
|
||||||
|
spin_lock(&scif_info.port_lock);
|
||||||
|
port = idr_find(&scif_ports, id);
|
||||||
|
if (port) {
|
||||||
|
port->ref_cnt--;
|
||||||
|
if (!port->ref_cnt) {
|
||||||
|
idr_remove(&scif_ports, id);
|
||||||
|
kfree(port);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
spin_unlock(&scif_info.port_lock);
|
||||||
|
}
|
||||||
Loading…
Reference in a new issue