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* intel_th: Mark sth_stm_packet() with notraceChunyan Zhang2016-11-221-4/+7
| | | | | | | | | | | | | If CONFIG_STM_SOURCE_FTRACE is selected, Function trace data can be writen to sink via STM, all functions that related to writing data packets to STM should be marked 'notrace' to avoid being traced by Ftrace, otherwise the program would stall into an endless loop. Link: http://lkml.kernel.org/r/1479715043-6534-5-git-send-email-zhang.chunyan@linaro.org Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org> Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
* intel_th: sth: Sanitize packet callback's return valuesAlexander Shishkin2016-02-201-3/+8
| | | | | | | | | | | | According to the stm class interface, the packet callback should return an error if it is asked to generate packets that it doesn't support. When it succeeds, it should return number of bytes consumed from its payload. Currently, for FLAG packet it mistakenly returns 1. This patch addresses these issues. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* intel_th: Check for NULL instead of ERR_PTRDan Carpenter2015-10-161-4/+4
| | | | | | | | | | devm_ioremap() returns NULL on error, it doesn't return an ERR_PTR, which is what the current code does. This patch corrects these checks. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
* intel_th: Add Software Trace Hub driverAlexander Shishkin2015-10-041-0/+259
Software Trace Hub (STH) is a trace source device in the Intel TH architecture, it generates data that then goes through the switch into one or several output ports. STH collects data from software sources using the stm device class abstraction. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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