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