ASoC: SOF: Print the dbg_dump and ipc_dump once to reduce kernel log noise

Do not print the dump more than once to keep the kernel log cleaner in case
of a firmware failure.

When the DSP is rebooted due to suspend or runtime_suspend reset the flags
to re-enable the dump prints.

Add also a debug flag to print all dumps to get more coverage if needed.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20211006110645.26679-5-peter.ujfalusi@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

sound/soc/sof/debug.c

@@ -827,7 +827,9 @@ void snd_sof_handle_fw_exception(struct snd_sof_dev *sdev)
 	if (IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_RETAIN_DSP_CONTEXT) ||
 	    (sof_core_debug & SOF_DBG_RETAIN_CTX)) {
 		/* should we prevent DSP entering D3 ? */
-		dev_info(sdev->dev, "info: preventing DSP entering D3 state to preserve context\n");
+		if (!sdev->ipc_dump_printed)
+			dev_info(sdev->dev,
+				 "preventing DSP entering D3 state to preserve context\n");
 		pm_runtime_get_noresume(sdev->dev);
 	}
 

sound/soc/sof/loader.c

@@ -791,6 +791,10 @@ int snd_sof_run_firmware(struct snd_sof_dev *sdev)
 
 	init_waitqueue_head(&sdev->boot_wait);
 
+	/* (re-)enable dsp dump */
+	sdev->dbg_dump_printed = false;
+	sdev->ipc_dump_printed = false;
+
 	/* create read-only fw_version debugfs to store boot version info */
 	if (sdev->first_boot) {
 		ret = snd_sof_debugfs_buf_item(sdev, &sdev->fw_version,

sound/soc/sof/ops.h

@@ -243,19 +243,23 @@ snd_sof_dsp_set_power_state(struct snd_sof_dev *sdev,
 /* debug */
 static inline void snd_sof_dsp_dbg_dump(struct snd_sof_dev *sdev, u32 flags)
 {
-	if (sof_ops(sdev)->dbg_dump) {
+	if (sof_ops(sdev)->dbg_dump && !sdev->dbg_dump_printed) {
 		dev_err(sdev->dev, "------------[ DSP dump start ]------------\n");
 		sof_ops(sdev)->dbg_dump(sdev, flags);
 		dev_err(sdev->dev, "------------[ DSP dump end ]------------\n");
+		if (!(sof_core_debug & SOF_DBG_PRINT_ALL_DUMPS))
+			sdev->dbg_dump_printed = true;
 	}
 }
 
 static inline void snd_sof_ipc_dump(struct snd_sof_dev *sdev)
 {
-	if (sof_ops(sdev)->ipc_dump) {
+	if (sof_ops(sdev)->ipc_dump  && !sdev->ipc_dump_printed) {
 		dev_err(sdev->dev, "------------[ IPC dump start ]------------\n");
 		sof_ops(sdev)->ipc_dump(sdev);
 		dev_err(sdev->dev, "------------[ IPC dump end ]------------\n");
+		if (!(sof_core_debug & SOF_DBG_PRINT_ALL_DUMPS))
+			sdev->ipc_dump_printed = true;
 	}
 }
 

sound/soc/sof/sof-priv.h

@@ -33,6 +33,7 @@
 #define SOF_DBG_DISABLE_MULTICORE		BIT(5) /* schedule all pipelines/widgets
 							* on primary core
 							*/
+#define SOF_DBG_PRINT_ALL_DUMPS		BIT(6) /* Print all ipc and dsp dumps */
 
 #define SOF_DBG_DUMP_REGS		BIT(0)
 #define SOF_DBG_DUMP_MBOX		BIT(1)
@@ -421,6 +422,8 @@ struct snd_sof_dev {
 	/* debug */
 	struct dentry *debugfs_root;
 	struct list_head dfsentry_list;
+	bool dbg_dump_printed;
+	bool ipc_dump_printed;
 
 	/* firmware loader */
 	struct snd_dma_buffer dmab;