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Message-ID: <202512150427.Kc14BEvI-lkp@intel.com>
Date: Mon, 15 Dec 2025 04:51:39 +0100
From: kernel test robot <lkp@...el.com>
To: Pankaj Gupta <pankaj.gupta@....com>, Jonathan Corbet <corbet@....net>,
Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
Sascha Hauer <s.hauer@...gutronix.de>,
Pengutronix Kernel Team <kernel@...gutronix.de>,
Fabio Estevam <festevam@...il.com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v21 1/7] Documentation/firmware: add imx/se to
other_interfaces
Hi Pankaj,
kernel test robot noticed the following build warnings:
[auto build test WARNING on 4a26e7032d7d57c998598c08a034872d6f0d3945]
url: https://github.com/intel-lab-lkp/linux/commits/Pankaj-Gupta/Documentation-firmware-add-imx-se-to-other_interfaces/20251212-172535
base: 4a26e7032d7d57c998598c08a034872d6f0d3945
patch link: https://lore.kernel.org/r/20251212-imx-se-if-v21-1-ee7d6052d848%40nxp.com
patch subject: [PATCH v21 1/7] Documentation/firmware: add imx/se to other_interfaces
reproduce: (https://download.01.org/0day-ci/archive/20251215/202512150427.Kc14BEvI-lkp@intel.com/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512150427.Kc14BEvI-lkp@intel.com/
All warnings (new ones prefixed by >>):
ERROR: Cannot find file ./include/linux/firmware/intel/stratix10-svc-client.h
WARNING: No kernel-doc for file ./include/linux/firmware/intel/stratix10-svc-client.h
Documentation/driver-api/firmware/other_interfaces.rst:60: ERROR: Unexpected indentation. [docutils]
Documentation/driver-api/firmware/other_interfaces.rst:103: ERROR: Unexpected indentation. [docutils]
Documentation/driver-api/firmware/other_interfaces.rst:115: ERROR: Unexpected indentation. [docutils]
>> Documentation/driver-api/firmware/other_interfaces.rst:116: WARNING: Blank line required after table. [docutils]
>> Documentation/driver-api/firmware/other_interfaces.rst:140: WARNING: Bullet list ends without a blank line; unexpected unindent. [docutils]
ERROR: Cannot find file ./drivers/firmware/imx/se_fw.c
ERROR: Cannot find file ./drivers/firmware/imx/se_fw.c
WARNING: No kernel-doc for file ./drivers/firmware/imx/se_fw.c
ERROR: Cannot find file ./include/linux/fpga/fpga-bridge.h
WARNING: No kernel-doc for file ./include/linux/fpga/fpga-bridge.h
vim +116 Documentation/driver-api/firmware/other_interfaces.rst
94
95 ::
96 +--------------------------------------------+
97 | Character Device(C_DEV) |
98 | |
99 | +---------+ +---------+ +---------+ |
100 | | misc #1 | | misc #2 | ... | misc #n | |
101 | | dev | | dev | | dev | |
102 | +---------+ +---------+ +---------+ |
103 | +-------------------------+ |
104 | | Misc. Dev Synchr. Logic | |
105 | +-------------------------+ |
106 | |
107 +--------------------------------------------+
108
109 +--------------------------------------------+
110 | Service Layer |
111 | |
112 | +-----------------------------+ |
113 | | Message Serialization Logic | |
114 | +-----------------------------+ |
115 | +---------------+ |
> 116 | | imx-mailbox | |
117 | | mailbox.c | |
118 | +---------------+ |
119 | |
120 +--------------------------------------------+
121
122 - service layer:
123 This layer is responsible for ensuring the communication protocol that is defined
124 for communication with firmware.
125
126 FW Communication protocol ensures two things:
127 - Serializing the messages to be sent over an MU.
128
129 - FW can handle one command message at a time.
130
131 - c_dev:
132 This layer offers character device contexts, created as '/dev/<se>_mux_chx'.
133 Using these multiple device contexts that are getting multiplexed over a single MU,
134 userspace application(s) can call fops like write/read to send the command message,
135 and read back the command response message to/from Firmware.
136 fops like read & write use the above defined service layer API(s) to communicate with
137 Firmware.
138
139 Misc-device(/dev/<se>_mux_chn) synchronization protocol:
> 140 ::
141
142 Non-Secure + Secure
143 |
144 |
145 +---------+ +-------------+ |
146 | se_fw.c +<---->+imx-mailbox.c| |
147 | | | mailbox.c +<-->+------+ +------+
148 +---+-----+ +-------------+ | MU X +<-->+ ELE |
149 | +------+ +------+
150 +----------------+ |
151 | | |
152 v v |
153 logical logical |
154 receiver waiter |
155 + + |
156 | | |
157 | | |
158 | +----+------+ |
159 | | | |
160 | | | |
161 device_ctx device_ctx device_ctx |
162 |
163 User 0 User 1 User Y |
164 +------+ +------+ +------+ |
165 |misc.c| |misc.c| |misc.c| |
166 kernel space +------+ +------+ +------+ |
167 |
168 +------------------------------------------------------ |
169 | | | |
170 userspace /dev/ele_muXch0 | | |
171 /dev/ele_muXch1 | |
172 /dev/ele_muXchY |
173 |
174
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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