1# SPDX-License-Identifier: GPL-2.0-only 2config STM 3 tristate "System Trace Module devices" 4 select CONFIGFS_FS 5 select SRCU 6 help 7 A System Trace Module (STM) is a device exporting data in System 8 Trace Protocol (STP) format as defined by MIPI STP standards. 9 Examples of such devices are Intel(R) Trace Hub and Coresight STM. 10 11 Say Y here to enable System Trace Module device support. 12 13if STM 14 15config STM_PROTO_BASIC 16 tristate "Basic STM framing protocol driver" 17 default CONFIG_STM 18 help 19 This is a simple framing protocol for sending data over STM 20 devices. This was the protocol that the STM framework used 21 exclusively until the MIPI SyS-T support was added. Use this 22 driver for compatibility with your existing STM setup. 23 24 The receiving side only needs to be able to decode the MIPI 25 STP protocol in order to extract the data. 26 27 If you want to be able to use the basic protocol or want the 28 backwards compatibility for your existing setup, say Y. 29 30config STM_PROTO_SYS_T 31 tristate "MIPI SyS-T STM framing protocol driver" 32 default CONFIG_STM 33 help 34 This is an implementation of MIPI SyS-T protocol to be used 35 over the STP transport. In addition to the data payload, it 36 also carries additional metadata for time correlation, better 37 means of trace source identification, etc. 38 39 The receiving side must be able to decode this protocol in 40 addition to the MIPI STP, in order to extract the data. 41 42 If you don't know what this is, say N. 43 44config STM_DUMMY 45 tristate "Dummy STM driver" 46 help 47 This is a simple dummy device that pretends to be an stm device 48 and discards your data. Use for stm class testing. 49 50 If you don't know what this is, say N. 51 52config STM_SOURCE_CONSOLE 53 tristate "Kernel console over STM devices" 54 help 55 This is a kernel space trace source that sends kernel log 56 messages to trace hosts over STM devices. 57 58 If you want to send kernel console messages over STM devices, 59 say Y. 60 61config STM_SOURCE_HEARTBEAT 62 tristate "Heartbeat over STM devices" 63 help 64 This is a kernel space trace source that sends periodic 65 heartbeat messages to trace hosts over STM devices. It is 66 also useful for testing stm class drivers and the stm class 67 framework itself. 68 69 If you want to send heartbeat messages over STM devices, 70 say Y. 71 72config STM_SOURCE_FTRACE 73 tristate "Copy the output from kernel Ftrace to STM engine" 74 depends on FUNCTION_TRACER 75 help 76 This option can be used to copy the output from kernel Ftrace 77 to STM engine. Enabling this option will introduce a slight 78 timing effect. 79 80 If you want to send kernel Ftrace messages over STM devices, 81 say Y. 82 83endif 84