In a number of debug cases, the DMA-based trace can add problems
(e.g. with HDaudio channel allocation). It also generates additional
traffic on the bus and if the DMA handling is unreliable will prevent
audio use-cases from working normally. Using the trace also requires
tools to be installed on the target.
The trace can be instead handled as dynamic debug. We can use a
Kconfig to force the trace to be enabled in all cases, or use a module
parameter to enable it on a need-basis, e.g. by setting "options
snd_sof sof_debug=0x1" in a /etc/modprobe.d file.
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
---
sound/soc/sof/Kconfig | 8 ++++++++
sound/soc/sof/core.c | 25 +++++++++++++++++++------
sound/soc/sof/sof-priv.h | 13 +++++++++----
sound/soc/sof/trace.c | 17 ++++++++++++++++-
4 files changed, 52 insertions(+), 11 deletions(-)
diff --git a/sound/soc/sof/Kconfig b/sound/soc/sof/Kconfig
index bb8036ae567e..cc592bcadae7 100644
--- a/sound/soc/sof/Kconfig
+++ b/sound/soc/sof/Kconfig
@@ -142,6 +142,14 @@ config SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE
Say Y if you want to enable caching the memory windows.
If unsure, select "N".
+config SND_SOC_SOF_DEBUG_ENABLE_FIRMWARE_TRACE
+ bool "SOF enable firmware trace"
+ help
+ The firmware trace can be enabled either at build-time with
+ this option, or dynamically by setting flags in the SOF core
+ module parameter (similar to dynamic debug)
+ If unsure, select "N".
+
config SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST
bool "SOF enable IPC flood test"
help
diff --git a/sound/soc/sof/core.c b/sound/soc/sof/core.c
index 81f28f7ff1a0..15167b8220ed 100644
--- a/sound/soc/sof/core.c
+++ b/sound/soc/sof/core.c
@@ -16,6 +16,11 @@
#include "sof-priv.h"
#include "ops.h"
+/* see SOF_DBG_ flags */
+int sof_core_debug;
+module_param_named(sof_debug, sof_core_debug, int, 0444);
+MODULE_PARM_DESC(sof_debug, "SOF core debug options (0x0 all off)");
+
/* SOF defaults if not provided by the platform in ms */
#define TIMEOUT_DEFAULT_IPC_MS 500
#define TIMEOUT_DEFAULT_BOOT_MS 2000
@@ -350,12 +355,20 @@ static int sof_probe_continue(struct snd_sof_dev *sdev)
goto fw_run_err;
}
- /* init DMA trace */
- ret = snd_sof_init_trace(sdev);
- if (ret < 0) {
- /* non fatal */
- dev_warn(sdev->dev,
- "warning: failed to initialize trace %d\n", ret);
+ if (IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_FIRMWARE_TRACE) ||
+ (sof_core_debug & SOF_DBG_ENABLE_TRACE)) {
+ sdev->dtrace_is_supported = true;
+
+ /* init DMA trace */
+ ret = snd_sof_init_trace(sdev);
+ if (ret < 0) {
+ /* non fatal */
+ dev_warn(sdev->dev,
+ "warning: failed to initialize trace %d\n",
+ ret);
+ }
+ } else {
+ dev_dbg(sdev->dev, "SOF firmware trace disabled\n");
}
/* hereafter all FW boot flows are for PM reasons */
diff --git a/sound/soc/sof/sof-priv.h b/sound/soc/sof/sof-priv.h
index 730f3259dd02..d5b1a4f895da 100644
--- a/sound/soc/sof/sof-priv.h
+++ b/sound/soc/sof/sof-priv.h
@@ -28,10 +28,14 @@
#include <uapi/sound/sof/fw.h>
/* debug flags */
-#define SOF_DBG_REGS BIT(1)
-#define SOF_DBG_MBOX BIT(2)
-#define SOF_DBG_TEXT BIT(3)
-#define SOF_DBG_PCI BIT(4)
+#define SOF_DBG_ENABLE_TRACE BIT(0)
+#define SOF_DBG_REGS BIT(1)
+#define SOF_DBG_MBOX BIT(2)
+#define SOF_DBG_TEXT BIT(3)
+#define SOF_DBG_PCI BIT(4)
+
+/* global debug state set by SOF_DBG_ flags */
+extern int sof_core_debug;
/* max BARs mmaped devices can use */
#define SND_SOF_BARS 8
@@ -434,6 +438,7 @@ struct snd_sof_dev {
int dma_trace_pages;
wait_queue_head_t trace_sleep;
u32 host_offset;
+ u32 dtrace_is_supported; /* set with Kconfig or module parameter */
u32 dtrace_is_enabled;
u32 dtrace_error;
u32 dtrace_draining;
diff --git a/sound/soc/sof/trace.c b/sound/soc/sof/trace.c
index 4c3cff031fd6..b0e4556c8536 100644
--- a/sound/soc/sof/trace.c
+++ b/sound/soc/sof/trace.c
@@ -162,6 +162,9 @@ int snd_sof_init_trace_ipc(struct snd_sof_dev *sdev)
struct sof_ipc_reply ipc_reply;
int ret;
+ if (!sdev->dtrace_is_supported)
+ return 0;
+
if (sdev->dtrace_is_enabled || !sdev->dma_trace_pages)
return -EINVAL;
@@ -222,6 +225,9 @@ int snd_sof_init_trace(struct snd_sof_dev *sdev)
{
int ret;
+ if (!sdev->dtrace_is_supported)
+ return 0;
+
/* set false before start initialization */
sdev->dtrace_is_enabled = false;
@@ -277,6 +283,9 @@ EXPORT_SYMBOL(snd_sof_init_trace);
int snd_sof_trace_update_pos(struct snd_sof_dev *sdev,
struct sof_ipc_dma_trace_posn *posn)
{
+ if (!sdev->dtrace_is_supported)
+ return 0;
+
if (sdev->dtrace_is_enabled && sdev->host_offset != posn->host_offset) {
sdev->host_offset = posn->host_offset;
wake_up(&sdev->trace_sleep);
@@ -293,6 +302,9 @@ int snd_sof_trace_update_pos(struct snd_sof_dev *sdev,
/* an error has occurred within the DSP that prevents further trace */
void snd_sof_trace_notify_for_error(struct snd_sof_dev *sdev)
{
+ if (!sdev->dtrace_is_supported)
+ return;
+
if (sdev->dtrace_is_enabled) {
dev_err(sdev->dev, "error: waking up any trace sleepers\n");
sdev->dtrace_error = true;
@@ -305,7 +317,7 @@ void snd_sof_release_trace(struct snd_sof_dev *sdev)
{
int ret;
- if (!sdev->dtrace_is_enabled)
+ if (!sdev->dtrace_is_supported || !sdev->dtrace_is_enabled)
return;
ret = snd_sof_dma_trace_trigger(sdev, SNDRV_PCM_TRIGGER_STOP);
@@ -326,6 +338,9 @@ EXPORT_SYMBOL(snd_sof_release_trace);
void snd_sof_free_trace(struct snd_sof_dev *sdev)
{
+ if (!sdev->dtrace_is_supported)
+ return;
+
snd_sof_release_trace(sdev);
snd_dma_free_pages(&sdev->dmatb);
--
2.20.1
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