ASoC: SOF: topology: allow for dynamic pipelines override for debug

For debug and community support, it's useful to expose a kernel
parameter to prevent the use of dynamic pipelines exposed in a
topology file, or conversely to force an existing topology to use
dynamic pipelines.

Add an override bit and an enable bit which is valid only when the
override is set.

For products, the intent is that the topology file defines the
behavior, these two bits are only intended for diagnosis and
performance checks.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <bard.liao@intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://lore.kernel.org/r/20211004212729.199550-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/sof-priv.h

@@ -24,6 +24,12 @@
 #define SOF_DBG_ENABLE_TRACE	BIT(0)
 #define SOF_DBG_RETAIN_CTX	BIT(1)	/* prevent DSP D3 on FW exception */
 #define SOF_DBG_VERIFY_TPLG	BIT(2) /* verify topology during load */
+#define SOF_DBG_DYNAMIC_PIPELINES_OVERRIDE	BIT(3) /* 0: use topology token
+							* 1: override topology
+							*/
+#define SOF_DBG_DYNAMIC_PIPELINES_ENABLE	BIT(4) /* 0: use static pipelines
+							* 1: use dynamic pipelines
+							*/
 
 #define SOF_DBG_DUMP_REGS		BIT(0)
 #define SOF_DBG_DUMP_MBOX		BIT(1)

sound/soc/sof/topology.c

@@ -1759,9 +1759,14 @@ static int sof_widget_load_pipeline(struct snd_soc_component *scomp, int index,
 		goto err;
 	}
 
-	dev_dbg(scomp->dev, "pipeline %s: period %d pri %d mips %d core %d frames %d\n",
+	if (sof_core_debug & SOF_DBG_DYNAMIC_PIPELINES_OVERRIDE)
+		swidget->dynamic_pipeline_widget = sof_core_debug &
+			SOF_DBG_DYNAMIC_PIPELINES_ENABLE;
+
+	dev_dbg(scomp->dev, "pipeline %s: period %d pri %d mips %d core %d frames %d dynamic %d\n",
 		swidget->widget->name, pipeline->period, pipeline->priority,
-		pipeline->period_mips, pipeline->core, pipeline->frames_per_sched);
+		pipeline->period_mips, pipeline->core, pipeline->frames_per_sched,
+		swidget->dynamic_pipeline_widget);
 
 	swidget->private = pipeline;