1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2020, Google Inc.
*
* ipc_pipe.cpp - Image Processing Algorithm IPC module for IPA proxies
*/
#include "libcamera/internal/ipc_pipe.h"
#include <libcamera/base/log.h>
/**
* \file ipc_pipe.h
* \brief IPC mechanism for IPA isolation
*/
namespace libcamera {
LOG_DEFINE_CATEGORY(IPCPipe)
/**
* \struct IPCMessage::Header
* \brief Container for an IPCMessage header
*
* Holds a cmd code for the IPC message, and a cookie.
*/
/**
* \var IPCMessage::Header::cmd
* \brief Type of IPCMessage
*
* Typically used to carry a command code for an RPC.
*/
/**
* \var IPCMessage::Header::cookie
* \brief Cookie to identify the message and a corresponding reply.
*
* Populated and used by IPCPipe implementations for matching calls with
* replies.
*/
/**
* \class IPCMessage
* \brief IPC message to be passed through IPC message pipe
*/
/**
* \brief Construct an empty IPCMessage instance
*/
IPCMessage::IPCMessage()
: header_(Header{ 0, 0 })
{
}
/**
* \brief Construct an IPCMessage instance with a given command code
* \param[in] cmd The command code
*/
IPCMessage::IPCMessage(uint32_t cmd)
: header_(Header{ cmd, 0 })
{
}
/**
* \brief Construct an IPCMessage instance with a given header
* \param[in] header The header that the constructed IPCMessage will contain
*/
IPCMessage::IPCMessage(const Header &header)
: header_(header)
{
}
/**
* \brief Construct an IPCMessage instance from an IPC payload
* \param[in] payload The IPCUnixSocket payload to construct from
*
* This essentially converts an IPCUnixSocket payload into an IPCMessage.
* The header is extracted from the payload into the IPCMessage's header field.
*
* If the IPCUnixSocket payload had any valid file descriptors, then they will
* all be invalidated.
*/
IPCMessage::IPCMessage(IPCUnixSocket::Payload &payload)
{
memcpy(&header_, payload.data.data(), sizeof(header_));
data_ = std::vector<uint8_t>(payload.data.begin() + sizeof(header_),
payload.data.end());
for (int32_t &fd : payload.fds)
fds_.push_back(SharedFD(std::move(fd)));
}
/**
* \brief Create an IPCUnixSocket payload from the IPCMessage
*
* This essentially converts the IPCMessage into an IPCUnixSocket payload.
*
* \todo Resolve the layering violation (add other converters later?)
*/
IPCUnixSocket::Payload IPCMessage::payload() const
{
IPCUnixSocket::Payload payload;
payload.data.resize(sizeof(Header) + data_.size());
payload.fds.reserve(fds_.size());
memcpy(payload.data.data(), &header_, sizeof(Header));
if (data_.size() > 0) {
/* \todo Make this work without copy */
memcpy(payload.data.data() + sizeof(Header),
data_.data(), data_.size());
}
for (const SharedFD &fd : fds_)
payload.fds.push_back(fd.fd());
return payload;
}
/**
* \fn IPCMessage::header()
* \brief Returns a reference to the header
*/
/**
* \fn IPCMessage::data()
* \brief Returns a reference to the byte vector containing data
*/
/**
* \fn IPCMessage::fds()
* \brief Returns a reference to the vector containing file descriptors
*/
/**
* \fn IPCMessage::header() const
* \brief Returns a const reference to the header
*/
/**
* \fn IPCMessage::data() const
* \brief Returns a const reference to the byte vector containing data
*/
/**
* \fn IPCMessage::fds() const
* \brief Returns a const reference to the vector containing file descriptors
*/
/**
* \class IPCPipe
* \brief IPC message pipe for IPA isolation
*
* Virtual class to model an IPC message pipe for use by IPA proxies for IPA
* isolation. sendSync() and sendAsync() must be implemented, and the recvMessage
* signal must be emitted whenever new data is available.
*/
/**
* \brief Construct an IPCPipe instance
*/
IPCPipe::IPCPipe()
: connected_(false)
{
}
IPCPipe::~IPCPipe()
{
}
/**
* \fn IPCPipe::isConnected()
* \brief Check if the IPCPipe instance is connected
*
* An IPCPipe instance is connected if IPC is successfully set up.
*
* \return True if the IPCPipe is connected, false otherwise
*/
/**
* \fn IPCPipe::sendSync()
* \brief Send a message over IPC synchronously
* \param[in] in Data to send
* \param[in] out IPCMessage instance in which to receive data, if applicable
*
* This function will not return until a response is received. The event loop
* will still continue to execute, however.
*
* \return Zero on success, negative error code otherwise
*
* \todo Determine if the event loop should limit the types of messages it
* processes, to avoid reintrancy in the caller, and carefully document what
* the caller needs to implement to make this safe.
*/
/**
* \fn IPCPipe::sendAsync()
* \brief Send a message over IPC asynchronously
* \param[in] data Data to send
*
* This function will return immediately after sending the message.
*
* \return Zero on success, negative error code otherwise
*/
/**
* \var IPCPipe::recv
* \brief Signal to be emitted when a message is received over IPC
*
* When a message is received over IPC, this signal shall be emitted. Users must
* connect to this to receive messages.
*/
/**
* \var IPCPipe::connected_
* \brief Flag to indicate if the IPCPipe instance is connected
*
* An IPCPipe instance is connected if IPC is successfully set up.
*
* This flag can be read via IPCPipe::isConnected().
*
* Implementations of the IPCPipe class should set this flag upon successful
* connection.
*/
} /* namespace libcamera */
|
