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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/or | |
5 | * modify it under the terms of EITHER the GNU General Public License | |
6 | * version 2 as published by the Free Software Foundation or the BSD | |
7 | * 2-Clause License. This program is distributed in the hope that it | |
8 | * will be useful, but WITHOUT ANY WARRANTY; WITHOUT EVEN THE IMPLIED | |
9 | * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. | |
10 | * See the GNU General Public License version 2 for more details at | |
11 | * 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 License | |
14 | * along with this program available in the file COPYING in the main | |
15 | * directory of this source tree. | |
16 | * | |
17 | * The BSD 2-Clause License | |
18 | * | |
19 | * Redistribution and use in source and binary forms, with or | |
20 | * without modification, are permitted provided that the following | |
21 | * conditions are met: | |
22 | * | |
23 | * - Redistributions of source code must retain the above | |
24 | * copyright notice, this list of conditions and the following | |
25 | * disclaimer. | |
26 | * | |
27 | * - Redistributions in binary form must reproduce the above | |
28 | * copyright notice, this list of conditions and the following | |
29 | * disclaimer in the documentation and/or other materials | |
30 | * provided with the distribution. | |
31 | * | |
32 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
33 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
34 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | |
35 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | |
36 | * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, | |
37 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
38 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
39 | * 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 ADVISED | |
43 | * 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 | ||
52 | static 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 | ||
82 | int | |
83 | pvrdma_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 | } |