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1What: /sys/kernel/debug/scmi/<n>/raw/message
2Date: March 2023
3KernelVersion: 6.3
4Contact: cristian.marussi@arm.com
5Description: SCMI Raw synchronous message injection/snooping facility; write
6 a complete SCMI synchronous command message (header included)
7 in little-endian binary format to have it sent to the configured
8 backend SCMI server for instance <n>.
9 Any subsequently received response can be read from this same
10 entry if it arrived within the configured timeout.
11 Each write to the entry causes one command request to be built
12 and sent while the replies are read back one message at time
13 (receiving an EOF at each message boundary).
14Users: Debugging, any userspace test suite
15
16What: /sys/kernel/debug/scmi/<n>/raw/message_async
17Date: March 2023
18KernelVersion: 6.3
19Contact: cristian.marussi@arm.com
20Description: SCMI Raw asynchronous message injection/snooping facility; write
21 a complete SCMI asynchronous command message (header included)
22 in little-endian binary format to have it sent to the configured
23 backend SCMI server for instance <n>.
24 Any subsequently received response can be read from this same
25 entry if it arrived within the configured timeout.
26 Any additional delayed response received afterwards can be read
27 from this same entry too if it arrived within the configured
28 timeout.
29 Each write to the entry causes one command request to be built
30 and sent while the replies are read back one message at time
31 (receiving an EOF at each message boundary).
32Users: Debugging, any userspace test suite
33
34What: /sys/kernel/debug/scmi/<n>/raw/message_poll
35Date: June 2025
36KernelVersion: 6.16
37Contact: cristian.marussi@arm.com
38Description: SCMI Raw message injection/snooping facility using polling mode;
39 write a complete SCMI command message (header included) in
40 little-endian binary format to have it sent to the configured
41 backend SCMI server for instance <n>, using polling mode on
42 the reception path. (if transport is polling capable)
43 Any subsequently received response can be read from this same
44 entry if it arrived within the configured timeout.
45 Each write to the entry causes one command request to be built
46 and sent while the replies are read back one message at time
47 (receiving an EOF at each message boundary).
48Users: Debugging, any userspace test suite
49
50What: /sys/kernel/debug/scmi/<n>/raw/message_poll_async
51Date: June 2025
52KernelVersion: 6.16
53Contact: cristian.marussi@arm.com
54Description: SCMI Raw asynchronous message injection/snooping facility using
55 polling-mode; write a complete SCMI asynchronous command message
56 (header included) in little-endian binary format to have it sent
57 to the configured backend SCMI server for instance <n>, using
58 polling-mode on the reception path of the immediate part of the
59 asynchronous command. (if transport is polling capable)
60 Any subsequently received response can be read from this same
61 entry if it arrived within the configured timeout.
62 Any additional delayed response received afterwards can be read
63 from this same entry too if it arrived within the configured
64 timeout.
65 Each write to the entry causes one command request to be built
66 and sent while the replies are read back one message at time
67 (receiving an EOF at each message boundary).
68Users: Debugging, any userspace test suite
69
70What: /sys/kernel/debug/scmi/<n>/raw/errors
71Date: March 2023
72KernelVersion: 6.3
73Contact: cristian.marussi@arm.com
74Description: SCMI Raw message errors facility; any kind of timed-out or
75 generally unexpectedly received SCMI message, for instance <n>,
76 can be read from this entry.
77 Each read gives back one message at time (receiving an EOF at
78 each message boundary).
79Users: Debugging, any userspace test suite
80
81What: /sys/kernel/debug/scmi/<n>/raw/notification
82Date: March 2023
83KernelVersion: 6.3
84Contact: cristian.marussi@arm.com
85Description: SCMI Raw notification snooping facility; any notification
86 emitted by the backend SCMI server, for instance <n>, can be
87 read from this entry.
88 Each read gives back one message at time (receiving an EOF at
89 each message boundary).
90Users: Debugging, any userspace test suite
91
92What: /sys/kernel/debug/scmi/<n>/raw/reset
93Date: March 2023
94KernelVersion: 6.3
95Contact: cristian.marussi@arm.com
96Description: SCMI Raw stack reset facility; writing a value to this entry
97 causes the internal queues of any kind of received message,
98 still pending to be read out for instance <n>, to be immediately
99 flushed.
100 Can be used to reset and clean the SCMI Raw stack between to
101 different test-run.
102Users: Debugging, any userspace test suite
103
104What: /sys/kernel/debug/scmi/<n>/raw/channels/<m>/message
105Date: March 2023
106KernelVersion: 6.3
107Contact: cristian.marussi@arm.com
108Description: SCMI Raw synchronous message injection/snooping facility; write
109 a complete SCMI synchronous command message (header included)
110 in little-endian binary format to have it sent to the configured
111 backend SCMI server for instance <n> through the <m> transport
112 channel.
113 Any subsequently received response can be read from this same
114 entry if it arrived on channel <m> within the configured
115 timeout.
116 Each write to the entry causes one command request to be built
117 and sent while the replies are read back one message at time
118 (receiving an EOF at each message boundary).
119 Channel identifier <m> matches the SCMI protocol number which
120 has been associated with this transport channel in the DT
121 description, with base protocol number 0x10 being the default
122 channel for this instance.
123 Note that these per-channel entries rooted at <..>/channels
124 exist only if the transport is configured to have more than
125 one default channel.
126Users: Debugging, any userspace test suite
127
128What: /sys/kernel/debug/scmi/<n>/raw/channels/<m>/message_async
129Date: March 2023
130KernelVersion: 6.3
131Contact: cristian.marussi@arm.com
132Description: SCMI Raw asynchronous message injection/snooping facility; write
133 a complete SCMI asynchronous command message (header included)
134 in little-endian binary format to have it sent to the configured
135 backend SCMI server for instance <n> through the <m> transport
136 channel.
137 Any subsequently received response can be read from this same
138 entry if it arrived on channel <m> within the configured
139 timeout.
140 Any additional delayed response received afterwards can be read
141 from this same entry too if it arrived within the configured
142 timeout.
143 Each write to the entry causes one command request to be built
144 and sent while the replies are read back one message at time
145 (receiving an EOF at each message boundary).
146 Channel identifier <m> matches the SCMI protocol number which
147 has been associated with this transport channel in the DT
148 description, with base protocol number 0x10 being the default
149 channel for this instance.
150 Note that these per-channel entries rooted at <..>/channels
151 exist only if the transport is configured to have more than
152 one default channel.
153Users: Debugging, any userspace test suite
154
155
156What: /sys/kernel/debug/scmi/<n>/raw/channels/<m>/message_poll
157Date: June 2025
158KernelVersion: 6.16
159Contact: cristian.marussi@arm.com
160Description: SCMI Raw message injection/snooping facility using polling mode;
161 write a complete SCMI command message (header included) in
162 little-endian binary format to have it sent to the configured
163 backend SCMI server for instance <n> through the <m> transport
164 channel, using polling mode on the reception path.
165 (if transport is polling capable)
166 Any subsequently received response can be read from this same
167 entry if it arrived on channel <m> within the configured
168 timeout.
169 Each write to the entry causes one command request to be built
170 and sent while the replies are read back one message at time
171 (receiving an EOF at each message boundary).
172 Channel identifier <m> matches the SCMI protocol number which
173 has been associated with this transport channel in the DT
174 description, with base protocol number 0x10 being the default
175 channel for this instance.
176 Note that these per-channel entries rooted at <..>/channels
177 exist only if the transport is configured to have more than
178 one default channel.
179Users: Debugging, any userspace test suite
180
181What: /sys/kernel/debug/scmi/<n>/raw/channels/<m>/message_poll_async
182Date: June 2025
183KernelVersion: 6.16
184Contact: cristian.marussi@arm.com
185Description: SCMI Raw asynchronous message injection/snooping facility using
186 polling-mode; write a complete SCMI asynchronous command message
187 (header included) in little-endian binary format to have it sent
188 to the configured backend SCMI server for instance <n> through
189 the <m> transport channel, using polling mode on the reception
190 path of the immediate part of the asynchronous command.
191 (if transport is polling capable)
192 Any subsequently received response can be read from this same
193 entry if it arrived on channel <m> within the configured
194 timeout.
195 Any additional delayed response received afterwards can be read
196 from this same entry too if it arrived within the configured
197 timeout.
198 Each write to the entry causes one command request to be built
199 and sent while the replies are read back one message at time
200 (receiving an EOF at each message boundary).
201 Channel identifier <m> matches the SCMI protocol number which
202 has been associated with this transport channel in the DT
203 description, with base protocol number 0x10 being the default
204 channel for this instance.
205 Note that these per-channel entries rooted at <..>/channels
206 exist only if the transport is configured to have more than
207 one default channel.
208Users: Debugging, any userspace test suite