1 What: /sys/class/remoteproc/.../firm 1 What: /sys/class/remoteproc/.../firmware
2 Date: October 2016 2 Date: October 2016
3 Contact: Matt Redfearn <matt.redfearn@mi 3 Contact: Matt Redfearn <matt.redfearn@mips.com>
4 Description: Remote processor firmware 4 Description: Remote processor firmware
5 5
6 Reports the name of the firmwa 6 Reports the name of the firmware currently loaded to the
7 remote processor. 7 remote processor.
8 8
9 To change the running firmware 9 To change the running firmware, ensure the remote processor is
10 stopped (using /sys/class/remo 10 stopped (using /sys/class/remoteproc/.../state) and write a new filename.
11 11
12 What: /sys/class/remoteproc/.../stat 12 What: /sys/class/remoteproc/.../state
13 Date: October 2016 13 Date: October 2016
14 Contact: Matt Redfearn <matt.redfearn@mi 14 Contact: Matt Redfearn <matt.redfearn@mips.com>
15 Description: Remote processor state 15 Description: Remote processor state
16 16
17 Reports the state of the remot 17 Reports the state of the remote processor, which will be one of:
18 18
19 - "offline" 19 - "offline"
20 - "suspended" 20 - "suspended"
21 - "running" 21 - "running"
22 - "crashed" 22 - "crashed"
23 - "invalid" 23 - "invalid"
24 24
25 "offline" means the remote pro 25 "offline" means the remote processor is powered off.
26 26
27 "suspended" means that the rem 27 "suspended" means that the remote processor is suspended and
28 must be woken to receive messa 28 must be woken to receive messages.
29 29
30 "running" is the normal state 30 "running" is the normal state of an available remote processor
31 31
32 "crashed" indicates that a pro 32 "crashed" indicates that a problem/crash has been detected on
33 the remote processor. 33 the remote processor.
34 34
35 "invalid" is returned if the r 35 "invalid" is returned if the remote processor is in an
36 unknown state. 36 unknown state.
37 37
38 Writing this file controls the 38 Writing this file controls the state of the remote processor.
39 The following states can be wr 39 The following states can be written:
40 40
41 - "start" 41 - "start"
42 - "stop" 42 - "stop"
43 43
44 Writing "start" will attempt t 44 Writing "start" will attempt to start the processor running the
45 firmware indicated by, or writ 45 firmware indicated by, or written to,
46 /sys/class/remoteproc/.../firm 46 /sys/class/remoteproc/.../firmware. The remote processor should
47 transition to "running" state. 47 transition to "running" state.
48 48
49 Writing "stop" will attempt to 49 Writing "stop" will attempt to halt the remote processor and
50 return it to the "offline" sta 50 return it to the "offline" state.
51 51
52 What: /sys/class/remoteproc/.../name 52 What: /sys/class/remoteproc/.../name
53 Date: August 2019 53 Date: August 2019
54 KernelVersion: 5.4 54 KernelVersion: 5.4
55 Contact: Suman Anna <s-anna@ti.com> 55 Contact: Suman Anna <s-anna@ti.com>
56 Description: Remote processor name 56 Description: Remote processor name
57 57
58 Reports the name of the remote 58 Reports the name of the remote processor. This can be used by
59 userspace in exactly identifyi 59 userspace in exactly identifying a remote processor and ease
60 up the usage in modifying the 60 up the usage in modifying the 'firmware' or 'state' files.
61 61
62 What: /sys/class/remoteproc/.../core 62 What: /sys/class/remoteproc/.../coredump
63 Date: July 2020 63 Date: July 2020
64 Contact: Bjorn Andersson <bjorn.andersso 64 Contact: Bjorn Andersson <bjorn.andersson@linaro.org>, Ohad Ben-Cohen <ohad@wizery.com>
65 Description: Remote processor coredump conf 65 Description: Remote processor coredump configuration
66 66
67 Reports the coredump configura 67 Reports the coredump configuration of the remote processor,
68 which will be one of: 68 which will be one of:
69 69
70 "disabled" 70 "disabled"
71 "enabled" 71 "enabled"
72 "inline" 72 "inline"
73 73
74 "disabled" means no dump will 74 "disabled" means no dump will be collected.
75 75
76 "enabled" means when the remot 76 "enabled" means when the remote processor's coredump is
77 collected it will be copied to 77 collected it will be copied to a separate buffer and that
78 buffer is exposed to userspace 78 buffer is exposed to userspace.
79 79
80 "inline" means when the remote 80 "inline" means when the remote processor's coredump is
81 collected userspace will direc 81 collected userspace will directly read from the remote
82 processor's device memory. Ext 82 processor's device memory. Extra buffer will not be used to
83 copy the dump. Also recovery p 83 copy the dump. Also recovery process will not proceed until
84 all data is read by userspace. !! 84 all data is read by usersapce.
85 85
86 What: /sys/class/remoteproc/.../reco 86 What: /sys/class/remoteproc/.../recovery
87 Date: July 2020 87 Date: July 2020
88 Contact: Bjorn Andersson <bjorn.andersso 88 Contact: Bjorn Andersson <bjorn.andersson@linaro.org>, Ohad Ben-Cohen <ohad@wizery.com>
89 Description: Remote processor recovery mech 89 Description: Remote processor recovery mechanism
90 90
91 Reports the recovery mechanism 91 Reports the recovery mechanism of the remote processor,
92 which will be one of: 92 which will be one of:
93 93
94 "enabled" 94 "enabled"
95 "disabled" 95 "disabled"
96 96
97 "enabled" means, the remote pr 97 "enabled" means, the remote processor will be automatically
98 recovered whenever it crashes. 98 recovered whenever it crashes. Moreover, if the remote
99 processor crashes while recove 99 processor crashes while recovery is disabled, it will
100 be automatically recovered too 100 be automatically recovered too as soon as recovery is enabled.
101 101
102 "disabled" means, a remote pro 102 "disabled" means, a remote processor will remain in a crashed
103 state if it crashes. This is u 103 state if it crashes. This is useful for debugging purposes;
104 without it, debugging a crash 104 without it, debugging a crash is substantially harder.
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