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1/*2 * Copyright (c) 2012-2016 VMware, Inc. All rights reserved.3 *4 * This program is free software; you can redistribute it and/or5 * modify it under the terms of EITHER the GNU General Public License6 * version 2 as published by the Free Software Foundation or the BSD7 * 2-Clause License. This program is distributed in the hope that it8 * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED9 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.10 * See the GNU General Public License version 2 for more details at11 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html.12 *13 * You should have received a copy of the GNU General Public License14 * along with this program available in the file COPYING in the main15 * directory of this source tree.16 *17 * The BSD 2-Clause License18 *19 * Redistribution and use in source and binary forms, with or20 * without modification, are permitted provided that the following21 * conditions are met:22 *23 * - Redistributions of source code must retain the above24 * copyright notice, this list of conditions and the following25 * disclaimer.26 *27 * - Redistributions in binary form must reproduce the above28 * copyright notice, this list of conditions and the following29 * disclaimer in the documentation and/or other materials30 * provided with the distribution.31 *32 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS33 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT34 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS35 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE36 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,37 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES38 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR39 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,41 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)42 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED43 * OF THE POSSIBILITY OF SUCH DAMAGE.44 */45 46#include <linux/list.h>47 48#include "pvrdma.h"49 50#define PVRDMA_CMD_TIMEOUT 10000 /* ms */51 52static inline int pvrdma_cmd_recv(struct pvrdma_dev *dev,53 union pvrdma_cmd_resp *resp,54 unsigned resp_code)55{56 int err;57 58 dev_dbg(&dev->pdev->dev, "receive response from device\n");59 60 err = wait_for_completion_interruptible_timeout(&dev->cmd_done,61 msecs_to_jiffies(PVRDMA_CMD_TIMEOUT));62 if (err == 0 || err == -ERESTARTSYS) {63 dev_warn(&dev->pdev->dev,64 "completion timeout or interrupted\n");65 return -ETIMEDOUT;66 }67 68 spin_lock(&dev->cmd_lock);69 memcpy(resp, dev->resp_slot, sizeof(*resp));70 spin_unlock(&dev->cmd_lock);71 72 if (resp->hdr.ack != resp_code) {73 dev_warn(&dev->pdev->dev,74 "unknown response %#x expected %#x\n",75 resp->hdr.ack, resp_code);76 return -EFAULT;77 }78 79 return 0;80}81 82int83pvrdma_cmd_post(struct pvrdma_dev *dev, union pvrdma_cmd_req *req,84 union pvrdma_cmd_resp *resp, unsigned resp_code)85{86 int err;87 88 dev_dbg(&dev->pdev->dev, "post request to device\n");89 90 /* Serializiation */91 down(&dev->cmd_sema);92 93 BUILD_BUG_ON(sizeof(union pvrdma_cmd_req) !=94 sizeof(struct pvrdma_cmd_modify_qp));95 96 spin_lock(&dev->cmd_lock);97 memcpy(dev->cmd_slot, req, sizeof(*req));98 spin_unlock(&dev->cmd_lock);99 100 init_completion(&dev->cmd_done);101 pvrdma_write_reg(dev, PVRDMA_REG_REQUEST, 0);102 103 /* Make sure the request is written before reading status. */104 mb();105 106 err = pvrdma_read_reg(dev, PVRDMA_REG_ERR);107 if (err == 0) {108 if (resp != NULL)109 err = pvrdma_cmd_recv(dev, resp, resp_code);110 } else {111 dev_warn(&dev->pdev->dev,112 "failed to write request error reg: %d\n", err);113 err = -EFAULT;114 }115 116 up(&dev->cmd_sema);117 118 return err;119}120