1# SPDX-License-Identifier: GPL-2.0-only 2config STM 3 tristate "System Trace Module devices" 4 select CONFIGFS_FS 5 help 6 A System Trace Module (STM) is a device exporting data in System 7 Trace Protocol (STP) format as defined by MIPI STP standards. 8 Examples of such devices are Intel(R) Trace Hub and Coresight STM. 9 10 Say Y here to enable System Trace Module device support. 11 12if STM 13 14config STM_PROTO_BASIC 15 tristate "Basic STM framing protocol driver" 16 default CONFIG_STM 17 help 18 This is a simple framing protocol for sending data over STM 19 devices. This was the protocol that the STM framework used 20 exclusively until the MIPI SyS-T support was added. Use this 21 driver for compatibility with your existing STM setup. 22 23 The receiving side only needs to be able to decode the MIPI 24 STP protocol in order to extract the data. 25 26 If you want to be able to use the basic protocol or want the 27 backwards compatibility for your existing setup, say Y. 28 29config STM_PROTO_SYS_T 30 tristate "MIPI SyS-T STM framing protocol driver" 31 default CONFIG_STM 32 help 33 This is an implementation of MIPI SyS-T protocol to be used 34 over the STP transport. In addition to the data payload, it 35 also carries additional metadata for time correlation, better 36 means of trace source identification, etc. 37 38 The receiving side must be able to decode this protocol in 39 addition to the MIPI STP, in order to extract the data. 40 41 If you don't know what this is, say N. 42 43config STM_DUMMY 44 tristate "Dummy STM driver" 45 help 46 This is a simple dummy device that pretends to be an stm device 47 and discards your data. Use for stm class testing. 48 49 If you don't know what this is, say N. 50 51config STM_SOURCE_CONSOLE 52 tristate "Kernel console over STM devices" 53 help 54 This is a kernel space trace source that sends kernel log 55 messages to trace hosts over STM devices. 56 57 If you want to send kernel console messages over STM devices, 58 say Y. 59 60config STM_SOURCE_HEARTBEAT 61 tristate "Heartbeat over STM devices" 62 help 63 This is a kernel space trace source that sends periodic 64 heartbeat messages to trace hosts over STM devices. It is 65 also useful for testing stm class drivers and the stm class 66 framework itself. 67 68 If you want to send heartbeat messages over STM devices, 69 say Y. 70 71config STM_SOURCE_FTRACE 72 tristate "Copy the output from kernel Ftrace to STM engine" 73 depends on TRACING 74 help 75 This option can be used to copy the output from kernel Ftrace 76 to STM engine. Enabling this option will introduce a slight 77 timing effect. 78 79 If you want to send kernel Ftrace messages over STM devices, 80 say Y. 81 82endif 83