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(x: &dev->cmd_done, |
61 | timeout: 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(lock: &dev->cmd_lock); |
69 | memcpy(resp, dev->resp_slot, sizeof(*resp)); |
70 | spin_unlock(lock: &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(sem: &dev->cmd_sema); |
92 | |
93 | BUILD_BUG_ON(sizeof(union pvrdma_cmd_req) != |
94 | sizeof(struct pvrdma_cmd_modify_qp)); |
95 | |
96 | spin_lock(lock: &dev->cmd_lock); |
97 | memcpy(dev->cmd_slot, req, sizeof(*req)); |
98 | spin_unlock(lock: &dev->cmd_lock); |
99 | |
100 | init_completion(x: &dev->cmd_done); |
101 | pvrdma_write_reg(dev, PVRDMA_REG_REQUEST, val: 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(sem: &dev->cmd_sema); |
117 | |
118 | return err; |
119 | } |
120 | |