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/*
* Copyright (c) 2012-2016 VMware, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of EITHER the GNU General Public License
* version 2 as published by the Free Software Foundation or the BSD
* 2-Clause License. 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 version 2 for more details at
* http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.
*
* You should have received a copy of the GNU General Public License
* along with this program available in the file COPYING in the main
* directory of this source tree.
*
* The BSD 2-Clause License
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/list.h>
#include "pvrdma.h"
#define PVRDMA_CMD_TIMEOUT 10000 /* ms */
static inline int pvrdma_cmd_recv(struct pvrdma_dev *dev,
union pvrdma_cmd_resp *resp,
unsigned resp_code)
{
int err;
dev_dbg(&dev->pdev->dev, "receive response from device\n");
err = wait_for_completion_interruptible_timeout(&dev->cmd_done,
msecs_to_jiffies(PVRDMA_CMD_TIMEOUT));
if (err == 0 || err == -ERESTARTSYS) {
dev_warn(&dev->pdev->dev,
"completion timeout or interrupted\n");
return -ETIMEDOUT;
}
spin_lock(&dev->cmd_lock);
memcpy(resp, dev->resp_slot, sizeof(*resp));
spin_unlock(&dev->cmd_lock);
if (resp->hdr.ack != resp_code) {
dev_warn(&dev->pdev->dev,
"unknown response %#x expected %#x\n",
resp->hdr.ack, resp_code);
return -EFAULT;
}
return 0;
}
int
pvrdma_cmd_post(struct pvrdma_dev *dev, union pvrdma_cmd_req *req,
union pvrdma_cmd_resp *resp, unsigned resp_code)
{
int err;
dev_dbg(&dev->pdev->dev, "post request to device\n");
/* Serializiation */
down(&dev->cmd_sema);
BUILD_BUG_ON(sizeof(union pvrdma_cmd_req) !=
sizeof(struct pvrdma_cmd_modify_qp));
spin_lock(&dev->cmd_lock);
memcpy(dev->cmd_slot, req, sizeof(*req));
spin_unlock(&dev->cmd_lock);
init_completion(&dev->cmd_done);
pvrdma_write_reg(dev, PVRDMA_REG_REQUEST, 0);
/* Make sure the request is written before reading status. */
mb();
err = pvrdma_read_reg(dev, PVRDMA_REG_ERR);
if (err == 0) {
if (resp != NULL)
err = pvrdma_cmd_recv(dev, resp, resp_code);
} else {
dev_warn(&dev->pdev->dev,
"failed to write request error reg: %d\n", err);
err = -EFAULT;
}
up(&dev->cmd_sema);
return err;
}
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