logger: new relative timestamps option, relative to first entry seen

[marc-hb]

2 commits. The only big and main one:

Add a new sof-logger -e 0/1 relative timestamps option where the
TIMESTAMP column is relative to the first entry seen.

Removes many digits and makes the TIMESTAMP column much more readable in
short logs.

Also stop showing "NaN" as the first DELTA like something went
wrong. Show zero instead.

The new option is off by default when using -r(aw) and on otherwise.

The first entry is kept always absolute.

Before:

 TIMESTAMP DELTA C# COMPONENT LOCATION CONTENT
[6653843012.343750] ( NaN) c0 dma-trace src/trace/dma-trace.c:339 ERROR FW ...
[6653843111.510417] ( 99.166664) c0 ll-schedule ./schedule/ll_schedule.c:229 perf ll_work
[6653843309.010417] ( 197.500000) c0 ll-schedule ./schedule/ll_schedule.c:399 task add
[6653843314.166667] ( 5.156250) c0 ll-schedule ./schedule/ll_schedule.c:403 task params
[6653843322.031250] ( 7.864583) c0 ll-schedule ./schedule/ll_schedule.c:309 new added
[6653843327.031250] ( 5.000000) c0 ll-schedule ./schedule/ll_schedule.c:312 num_tasks 2
[6653844109.531250] ( 782.500000) c0 sa src/lib/agent.c:65 perf sys_load
[6653844155.156250] ( 45.625000) c0 ll-schedule ./schedule/ll_schedule.c:229 perf ll_work
[6653844384.218750] ( 229.062500) c0 component src/audio/component.c:130 comp new host

After:

 TIMESTAMP DELTA C# COMPONENT LOCATION CONTENT
[686125142.395834] ( 0.000000) c0 dma-trace src/trace/dma-trace.c:339 ERROR FW ...
[ 94.270833] ( 94.270836) c0 ll-schedule ./schedule/ll_schedule.c:229 perf ll_work
[ 296.770833] ( 202.500000) c0 ll-schedule ./schedule/ll_schedule.c:399 task add
[ 301.979167] ( 5.208333) c0 ll-schedule ./schedule/ll_schedule.c:403 task params
[ 309.843750] ( 7.864583) c0 ll-schedule ./schedule/ll_schedule.c:309 new added
[ 314.843750] ( 5.000000) c0 ll-schedule ./schedule/ll_schedule.c:312 num_tasks 2
[ 1092.395833] ( 777.552063) c0 sa src/lib/agent.c:65 perf sys_load
[ 1137.968750] ( 45.572918) c0 ll-schedule ./schedule/ll_schedule.c:229 perf ll_work
[ 1850.208333] ( 712.239563) c0 component src/audio/component.c:130 comp new host

[dbaluta]

I think it is better to add strreror(errno). In my case most common problem is that I forget to add sof debugging support in linux so the debugfs file isn't even there.

[lgirdwood]

ack, IIUC the strerror() also has language translations.

[paulstelian97]

Please resubmit with "main" as PR base branch.

[marc-hb]

As the strerror() patch grew much bigger I split this into two different PRs re-submitted to the main branch:

logger: new relative timestamps option, relative to first entry seen #3985
logger: use strerror() #3984