125 lines
2.8 KiB
C
125 lines
2.8 KiB
C
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/*
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* Intel MIC Platform Software Stack (MPSS)
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*
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* Copyright(c) 2014 Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* Intel SCIF driver.
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*
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*/
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#include <linux/idr.h>
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#include "scif_main.h"
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#define SCIF_PORT_COUNT 0x10000 /* Ports available */
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struct idr scif_ports;
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/*
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* struct scif_port - SCIF port information
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*
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* @ref_cnt - Reference count since there can be multiple endpoints
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* created via scif_accept(..) simultaneously using a port.
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*/
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struct scif_port {
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int ref_cnt;
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};
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/**
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* __scif_get_port - Reserve a specified port # for SCIF and add it
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* to the global list.
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* @port : port # to be reserved.
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*
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* @return : Allocated SCIF port #, or -ENOSPC if port unavailable.
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* On memory allocation failure, returns -ENOMEM.
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*/
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static int __scif_get_port(int start, int end)
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{
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int id;
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struct scif_port *port = kzalloc(sizeof(*port), GFP_ATOMIC);
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if (!port)
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return -ENOMEM;
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spin_lock(&scif_info.port_lock);
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id = idr_alloc(&scif_ports, port, start, end, GFP_ATOMIC);
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if (id >= 0)
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port->ref_cnt++;
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spin_unlock(&scif_info.port_lock);
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return id;
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}
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/**
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* scif_rsrv_port - Reserve a specified port # for SCIF.
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* @port : port # to be reserved.
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*
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* @return : Allocated SCIF port #, or -ENOSPC if port unavailable.
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* On memory allocation failure, returns -ENOMEM.
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*/
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int scif_rsrv_port(u16 port)
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{
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return __scif_get_port(port, port + 1);
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}
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/**
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* scif_get_new_port - Get and reserve any port # for SCIF in the range
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* SCIF_PORT_RSVD + 1 to SCIF_PORT_COUNT - 1.
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*
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* @return : Allocated SCIF port #, or -ENOSPC if no ports available.
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* On memory allocation failure, returns -ENOMEM.
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*/
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int scif_get_new_port(void)
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{
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return __scif_get_port(SCIF_PORT_RSVD + 1, SCIF_PORT_COUNT);
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}
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/**
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* scif_get_port - Increment the reference count for a SCIF port
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* @id : SCIF port
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*
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* @return : None
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*/
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void scif_get_port(u16 id)
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{
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struct scif_port *port;
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if (!id)
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return;
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spin_lock(&scif_info.port_lock);
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port = idr_find(&scif_ports, id);
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if (port)
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port->ref_cnt++;
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spin_unlock(&scif_info.port_lock);
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}
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/**
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* scif_put_port - Release a reserved SCIF port
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* @id : SCIF port to be released.
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*
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* @return : None
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*/
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void scif_put_port(u16 id)
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{
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struct scif_port *port;
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if (!id)
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return;
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spin_lock(&scif_info.port_lock);
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port = idr_find(&scif_ports, id);
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if (port) {
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port->ref_cnt--;
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if (!port->ref_cnt) {
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idr_remove(&scif_ports, id);
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kfree(port);
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}
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}
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spin_unlock(&scif_info.port_lock);
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}
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