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Diffstat (limited to 'TODO')
| -rw-r--r-- | TODO | 19 |
1 files changed, 19 insertions, 0 deletions
@@ -0,0 +1,19 @@ +* ETMv4/PTM - decoder updates to handle advanced configuration. +-> Certain (currently unused by perf / current hardware) configuration settings + can alter the format of the trace output. One example is Return Stack - + settable in the control registers for PTM/ETMv4, and removes some inline + addresses. Decoder must use a follower to correctly trace when this is set. + +* ITM packet processing and decode. +-> ITM is primarily an M class SW trace module. I wouldn't expect to see it on + systems with STM, unless a companion M class was present. + +*Data trace - ETMv4 / ETMv3 +-> Differing solutions to data trace in v4/v3 - v4 is separate trace stream + completely, output at trace ID <instruction_trace_ID>+1. ETMv3 is inline with + the instruction trace. + +Cortex-A cores do not support this architecturally. On R and M profile cores it +is an option. There are scenarios in future that could see linux on R cores, plus +on something like Juno it is possible to switch on trace for the SCP +(M class processor). So at some point data trace may be required. |