diff --git a/sound/soc/sof/Kconfig b/sound/soc/sof/Kconfig
index ca3ad3362478a4d64df5122528b233ca602e6d24..1d4b4dced4b66eed28cf6ae023a617434cf60a2c 100644
--- a/sound/soc/sof/Kconfig
+++ b/sound/soc/sof/Kconfig
@@ -131,6 +131,14 @@ 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_IPC_FLOOD_TEST
+ bool "SOF enable IPC flood test"
+ help
+ This option enables the IPC flood test which can be used to flood
+ the DSP with test IPCs and gather stats about response times.
+ Say Y if you want to enable IPC flood test.
+ If unsure, select "N".
+
endif ## SND_SOC_SOF_DEBUG
endif ## SND_SOC_SOF_OPTIONS
diff --git a/sound/soc/sof/debug.c b/sound/soc/sof/debug.c
index 219c3becf670fb9f9cd2018119bd88a3ff451acc..54bb53bfc81bf296d9d5f5cca5469c8d398ea911 100644
--- a/sound/soc/sof/debug.c
+++ b/sound/soc/sof/debug.c
@@ -17,6 +17,203 @@
#include "sof-priv.h"
#include "ops.h"
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
+#define MAX_IPC_FLOOD_DURATION_MS 1000
+#define MAX_IPC_FLOOD_COUNT 10000
+#define IPC_FLOOD_TEST_RESULT_LEN 512
+
+static int sof_debug_ipc_flood_test(struct snd_sof_dev *sdev,
+ struct snd_sof_dfsentry *dfse,
+ bool flood_duration_test,
+ unsigned long ipc_duration_ms,
+ unsigned long ipc_count)
+{
+ struct sof_ipc_cmd_hdr hdr;
+ struct sof_ipc_reply reply;
+ u64 min_response_time = U64_MAX;
+ ktime_t start, end, test_end;
+ u64 avg_response_time = 0;
+ u64 max_response_time = 0;
+ u64 ipc_response_time;
+ int i = 0;
+ int ret;
+
+ /* configure test IPC */
+ hdr.cmd = SOF_IPC_GLB_TEST_MSG | SOF_IPC_TEST_IPC_FLOOD;
+ hdr.size = sizeof(hdr);
+
+ /* set test end time for duration flood test */
+ if (flood_duration_test)
+ test_end = ktime_get_ns() + ipc_duration_ms * NSEC_PER_MSEC;
+
+ /* send test IPC's */
+ while (1) {
+ start = ktime_get();
+ ret = sof_ipc_tx_message(sdev->ipc, hdr.cmd, &hdr, hdr.size,
+ &reply, sizeof(reply));
+ end = ktime_get();
+
+ if (ret < 0)
+ break;
+
+ /* compute min and max response times */
+ ipc_response_time = ktime_to_ns(ktime_sub(end, start));
+ min_response_time = min(min_response_time, ipc_response_time);
+ max_response_time = max(max_response_time, ipc_response_time);
+
+ /* sum up response times */
+ avg_response_time += ipc_response_time;
+ i++;
+
+ /* test complete? */
+ if (flood_duration_test) {
+ if (ktime_to_ns(end) >= test_end)
+ break;
+ } else {
+ if (i == ipc_count)
+ break;
+ }
+ }
+
+ if (ret < 0)
+ dev_err(sdev->dev,
+ "error: ipc flood test failed at %d iterations\n", i);
+
+ /* return if the first IPC fails */
+ if (!i)
+ return ret;
+
+ /* compute average response time */
+ do_div(avg_response_time, i);
+
+ /* clear previous test output */
+ memset(dfse->cache_buf, 0, IPC_FLOOD_TEST_RESULT_LEN);
+
+ if (flood_duration_test) {
+ dev_dbg(sdev->dev, "IPC Flood test duration: %lums\n",
+ ipc_duration_ms);
+ snprintf(dfse->cache_buf, IPC_FLOOD_TEST_RESULT_LEN,
+ "IPC Flood test duration: %lums\n", ipc_duration_ms);
+ }
+
+ dev_dbg(sdev->dev,
+ "IPC Flood count: %d, Avg response time: %lluns\n",
+ i, avg_response_time);
+ dev_dbg(sdev->dev, "Max response time: %lluns\n",
+ max_response_time);
+ dev_dbg(sdev->dev, "Min response time: %lluns\n",
+ min_response_time);
+
+ /* format output string */
+ snprintf(dfse->cache_buf + strlen(dfse->cache_buf),
+ IPC_FLOOD_TEST_RESULT_LEN - strlen(dfse->cache_buf),
+ "IPC Flood count: %d\nAvg response time: %lluns\n",
+ i, avg_response_time);
+
+ snprintf(dfse->cache_buf + strlen(dfse->cache_buf),
+ IPC_FLOOD_TEST_RESULT_LEN - strlen(dfse->cache_buf),
+ "Max response time: %lluns\nMin response time: %lluns\n",
+ max_response_time, min_response_time);
+
+ return ret;
+}
+#endif
+
+static ssize_t sof_dfsentry_write(struct file *file, const char __user *buffer,
+ size_t count, loff_t *ppos)
+{
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
+ struct snd_sof_dfsentry *dfse = file->private_data;
+ struct snd_sof_dev *sdev = dfse->sdev;
+ unsigned long ipc_duration_ms = 0;
+ bool flood_duration_test = false;
+ unsigned long ipc_count = 0;
+ int err;
+#endif
+ size_t size;
+ char *string;
+ int ret;
+
+ string = kzalloc(count, GFP_KERNEL);
+ if (!string)
+ return -ENOMEM;
+
+ size = simple_write_to_buffer(string, count, ppos, buffer, count);
+ ret = size;
+
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
+ /*
+ * write op is only supported for ipc_flood_count or
+ * ipc_flood_duration_ms debugfs entries atm.
+ * ipc_flood_count floods the DSP with the number of IPC's specified.
+ * ipc_duration_ms test floods the DSP for the time specified
+ * in the debugfs entry.
+ */
+ if (strcmp(dfse->dfsentry->d_name.name, "ipc_flood_count") &&
+ strcmp(dfse->dfsentry->d_name.name, "ipc_flood_duration_ms"))
+ return -EINVAL;
+
+ if (!strcmp(dfse->dfsentry->d_name.name, "ipc_flood_duration_ms"))
+ flood_duration_test = true;
+
+ /* test completion criterion */
+ if (flood_duration_test)
+ ret = kstrtoul(string, 0, &ipc_duration_ms);
+ else
+ ret = kstrtoul(string, 0, &ipc_count);
+ if (ret < 0)
+ return ret;
+
+ /* limit max duration/ipc count for flood test */
+ if (flood_duration_test) {
+ if (!ipc_duration_ms) {
+ ret = size;
+ goto out;
+ }
+
+ /* find the minimum. min() is not used to avoid warnings */
+ if (ipc_duration_ms > MAX_IPC_FLOOD_DURATION_MS)
+ ipc_duration_ms = MAX_IPC_FLOOD_DURATION_MS;
+ } else {
+ if (!ipc_count) {
+ ret = size;
+ goto out;
+ }
+
+ /* find the minimum. min() is not used to avoid warnings */
+ if (ipc_count > MAX_IPC_FLOOD_COUNT)
+ ipc_count = MAX_IPC_FLOOD_COUNT;
+ }
+
+ ret = pm_runtime_get_sync(sdev->dev);
+ if (ret < 0) {
+ dev_err_ratelimited(sdev->dev,
+ "error: debugfs write failed to resume %d\n",
+ ret);
+ pm_runtime_put_noidle(sdev->dev);
+ return ret;
+ }
+
+ /* flood test */
+ ret = sof_debug_ipc_flood_test(sdev, dfse, flood_duration_test,
+ ipc_duration_ms, ipc_count);
+
+ pm_runtime_mark_last_busy(sdev->dev);
+ err = pm_runtime_put_autosuspend(sdev->dev);
+ if (err < 0)
+ dev_err_ratelimited(sdev->dev,
+ "error: debugfs write failed to idle %d\n",
+ err);
+
+ /* return size if test is successful */
+ if (ret >= 0)
+ ret = size;
+out:
+#endif
+ kfree(string);
+ return ret;
+}
+
static ssize_t sof_dfsentry_read(struct file *file, char __user *buffer,
size_t count, loff_t *ppos)
{
@@ -28,6 +225,22 @@ static ssize_t sof_dfsentry_read(struct file *file, char __user *buffer,
int size;
u8 *buf;
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
+ if ((!strcmp(dfse->dfsentry->d_name.name, "ipc_flood_count") ||
+ !strcmp(dfse->dfsentry->d_name.name, "ipc_flood_duration_ms")) &&
+ dfse->cache_buf) {
+ if (*ppos)
+ return 0;
+
+ count = strlen(dfse->cache_buf);
+ size_ret = copy_to_user(buffer, dfse->cache_buf, count);
+ if (size_ret)
+ return -EFAULT;
+
+ *ppos += count;
+ return count;
+ }
+#endif
size = dfse->size;
/* validate position & count */
@@ -107,6 +320,7 @@ static const struct file_operations sof_dfs_fops = {
.open = simple_open,
.read = sof_dfsentry_read,
.llseek = default_llseek,
+ .write = sof_dfsentry_write,
};
/* create FS entry for debug files that can expose DSP memories, registers */
@@ -177,6 +391,17 @@ int snd_sof_debugfs_buf_item(struct snd_sof_dev *sdev,
dfse->size = size;
dfse->sdev = sdev;
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
+ /*
+ * cache_buf is unused for SOF_DFSENTRY_TYPE_BUF debugfs entries.
+ * So, use it to save the results of the last IPC flood test.
+ */
+ dfse->cache_buf = devm_kzalloc(sdev->dev, IPC_FLOOD_TEST_RESULT_LEN,
+ GFP_KERNEL);
+ if (!dfse->cache_buf)
+ return -ENOMEM;
+#endif
+
dfse->dfsentry = debugfs_create_file(name, mode, sdev->debugfs_root,
dfse, &sof_dfs_fops);
if (!dfse->dfsentry) {
@@ -221,6 +446,24 @@ int snd_sof_dbg_init(struct snd_sof_dev *sdev)
return err;
}
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST)
+ /* create read-write ipc_flood_count debugfs entry */
+ err = snd_sof_debugfs_buf_item(sdev, NULL, 0,
+ "ipc_flood_count", 0666);
+
+ /* errors are only due to memory allocation, not debugfs */
+ if (err < 0)
+ return err;
+
+ /* create read-write ipc_flood_duration_ms debugfs entry */
+ err = snd_sof_debugfs_buf_item(sdev, NULL, 0,
+ "ipc_flood_duration_ms", 0666);
+
+ /* errors are only due to memory allocation, not debugfs */
+ if (err < 0)
+ return err;
+#endif
+
return 0;
}
EXPORT_SYMBOL_GPL(snd_sof_dbg_init);
diff --git a/sound/soc/sof/sof-priv.h b/sound/soc/sof/sof-priv.h
index ce22240cd93af612e791b8fa44f9eb3f7f794e2d..17f3d2a5a7019c5ba1a6f2235aed67d2e8be3f14 100644
--- a/sound/soc/sof/sof-priv.h
+++ b/sound/soc/sof/sof-priv.h
@@ -56,6 +56,10 @@
#define SOF_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE | \
SNDRV_PCM_FMTBIT_S32_LE | SNDRV_PCM_FMTBIT_FLOAT)
+#define ENABLE_DEBUGFS_CACHEBUF \
+ (IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE) || \
+ IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST))
+
struct snd_sof_dev;
struct snd_sof_ipc_msg;
struct snd_sof_ipc;
@@ -226,7 +230,7 @@ struct snd_sof_dfsentry {
* or if it is accessible only when the DSP is in D0.
*/
enum sof_debugfs_access_type access_type;
-#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG_ENABLE_DEBUGFS_CACHE)
+#if ENABLE_DEBUGFS_CACHEBUF
char *cache_buf; /* buffer to cache the contents of debugfs memory */
#endif
struct snd_sof_dev *sdev;