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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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