tools: sof_perf_analyzer: remove skip to first trace option

CI performance test is failing in recent daily build, this is
due to timestamp are aligned between kernel and SOF, details
are listed in below link.

The firmware timestamp is in sync with the host side now,
and becomes much more deterministic. The condition to use
--skip-to-first-trace option in CI is eliminated (see the help
info for the reason it is used in CI test).

Based on this, skip-to-first-trace are not needed anymore,
hence remove it from the script.

Link: thesofproject/sof#8480

Signed-off-by: Baofeng Tian <[email protected]>

case-lib/lib.sh

@@ -966,9 +966,9 @@ perf_analyze()
     dlogi "Checking SOF component performance"
     if [ -e "$LOG_ROOT/mtrace.txt" ]; then
         if [ -e "$LOG_ROOT/dmesg.txt" ]; then
-            perf_cmd="sof_perf_analyzer.py --skip-to-first-trace --kmsg=$LOG_ROOT/dmesg.txt --out2html $LOG_ROOT/sof_perf.html $LOG_ROOT/mtrace.txt"
+            perf_cmd="sof_perf_analyzer.py --kmsg=$LOG_ROOT/dmesg.txt --out2html $LOG_ROOT/sof_perf.html $LOG_ROOT/mtrace.txt"
         else
-            perf_cmd="sof_perf_analyzer.py --skip-to-first-trace --out2html $LOG_ROOT/sof_perf.html $LOG_ROOT/mtrace.txt"
+            perf_cmd="sof_perf_analyzer.py --out2html $LOG_ROOT/sof_perf.html $LOG_ROOT/mtrace.txt"
         fi
         dlogc "$perf_cmd"
         eval "$perf_cmd" || {

tools/sof_perf_analyzer.py

@@ -96,17 +96,6 @@ def dispatch_trace_item(trace_item: TraceItem):
     if trace_item.func == 'comp_copy':
         collect_perf_info(trace_item)
 
-def skip_to_first_trace(trace_item_gen: TraceItemGenerator):
-    '''The current sof-test test case may collect some traces belonging to previous
-    test case due to mtrace is configured in deferred mode. This function consumes
-    those traces from the generator, and return the first trace item of current test.
-    '''
-    while item := next(trace_item_gen):
-        # On test running, the SOF firmware is reloaded to DSP, timer is reset to 0.
-        # The first trace must have a timestamp with integral part equals to 0.
-        if int(item.timestamp) == 0:
-            return item
-
 def make_trace_item(fileio: TextIO) -> TraceItemGenerator:
     '''Filter and parse a line of trace in string form into TraceItem object, for example:
     '[    2.566046] <inf> component: comp_copy: comp:0 0x40000 perf comp_copy samples
@@ -155,15 +144,7 @@ def process_trace_file():
     ts_shift = 0
     with open(args.filename, 'r', encoding='utf8') as file:
         trace_item_gen = make_trace_item(file)
-        trace_prev = None
-        try:
-            if args.skip_to_first_trace:
-                trace_prev = skip_to_first_trace(trace_item_gen)
-            else:
-                trace_prev = next(trace_item_gen)
-        except StopIteration as si:
-            si.args = ('No valid trace in provided file',)
-            raise
+        trace_prev = next(trace_item_gen)
         for trace_curr in trace_item_gen:
             # pylint: disable=W0603
             old_ts_shift = ts_shift
@@ -279,11 +260,6 @@ def parse_args():
                     help='Output SOF performance statistics to csv file')
     parser.add_argument('--out2html', type=pathlib.Path, required=False,
                     help='Output SOF performance statistics to html file')
-    parser.add_argument('-s', '--skip-to-first-trace', action="store_true",  default=False,
-                        help='''In CI test, some traces from previous test case will appear in
-the mtrace of current test case, this flag is used to denote if we
-want to skip until the first line with a timestamp between 0 and 1s.
-For CI test, set the flag to True''')
 
     return parser.parse_args()