clear-pkgs-linux-iot-lts2018/0207-ASoC-Intel-Skylake-Add-user-notification-event-for-p.patch

From 0c401072aebe2a7bd10608974ae2f29b52f9be8f Mon Sep 17 00:00:00 2001
From: Anamika Lal <anamikax.lal@intel.com>
Date: Wed, 3 May 2017 01:20:41 +0530
Subject: [PATCH 207/550] ASoC: Intel: Skylake: Add user notification event for
 pipe creation/deletion

This patch provides kernel event generation on pipeline creation/deletion
and also update the debugfs file with event timestamp.
Userspace gets the event for each pipe creation and deletion and can read
the event timestamp from the debugfs.

Change-Id: I6e015e5f3e5285ecad215a37dfe286a4e3dc3435
Signed-off-by: Guneshwor Singh <guneshwor.o.singh@intel.com>
Signed-off-by: Anamika Lal <anamikax.lal@intel.com>
Reviewed-on:
Reviewed-by: audio_build <audio_build@intel.com>
Reviewed-by: Prusty, Subhransu S <subhransu.s.prusty@intel.com>
Reviewed-by: Koul, Vinod <vinod.koul@intel.com>
Tested-by: Sm, Bhadur A <bhadur.a.sm@intel.com>
---
 sound/soc/intel/skylake/skl-debug.c    | 80 ++++++++++++++++++++++++++
 sound/soc/intel/skylake/skl-messages.c |  2 +
 sound/soc/intel/skylake/skl.h          |  4 ++
 3 files changed, 86 insertions(+)

diff --git a/sound/soc/intel/skylake/skl-debug.c b/sound/soc/intel/skylake/skl-debug.c
index 07b3309bf4ee..f3c5e29afaa6 100644
--- a/sound/soc/intel/skylake/skl-debug.c
+++ b/sound/soc/intel/skylake/skl-debug.c
@@ -56,6 +56,11 @@ struct nhlt_blob {
 	struct nhlt_specific_cfg *cfg;
 };
 
+struct skl_pipe_event_data {
+	long event_time;
+	int event_type;
+};
+
 struct skl_debug {
 	struct skl *skl;
 	struct device *dev;
@@ -68,6 +73,7 @@ struct skl_debug {
 	struct nhlt_blob dmic_blob;
 	u32 ipc_data[MAX_SZ];
 	struct fw_ipc_data fw_ipc_data;
+	struct skl_pipe_event_data data;
 };
 
 struct nhlt_specific_cfg
@@ -815,9 +821,76 @@ static const struct file_operations core_power_fops = {
 	.llseek = default_llseek,
 };
 
+void skl_dbg_event(struct skl_sst *ctx, int type)
+{
+	int retval;
+	struct timeval pipe_event_tv;
+	struct skl *skl = get_skl_ctx(ctx->dev);
+	struct kobject *kobj;
+
+	kobj = &skl->component->dev->kobj;
+
+	if (type == SKL_PIPE_CREATED)
+		/* pipe creation event */
+		retval = kobject_uevent(kobj, KOBJ_ADD);
+	else if (type == SKL_PIPE_INVALID)
+		/* pipe deletion event */
+		retval = kobject_uevent(kobj, KOBJ_REMOVE);
+	else
+		return;
+
+	if (retval < 0) {
+		dev_err(ctx->dev,
+			"pipeline uevent failed, ret = %d\n", retval);
+		return;
+	}
+
+	do_gettimeofday(&pipe_event_tv);
+
+	skl->debugfs->data.event_time = pipe_event_tv.tv_usec;
+	skl->debugfs->data.event_type = type;
+}
+
+static ssize_t skl_dbg_event_read(struct file *file,
+		char __user *user_buf, size_t count, loff_t *ppos)
+{
+	struct skl_debug *d = file->private_data;
+	char buf[32];
+	char pipe_state[24];
+	int retval;
+
+	if (d->data.event_type)
+		strcpy(pipe_state, "SKL_PIPE_CREATED");
+	else
+		strcpy(pipe_state, "SKL_PIPE_INVALID");
+
+	retval = snprintf(buf, sizeof(buf), "%s - %ld\n",
+			pipe_state, d->data.event_time);
+
+	return simple_read_from_buffer(user_buf, count, ppos, buf, retval);
+}
+
+static const struct file_operations skl_dbg_event_fops = {
+	.open = simple_open,
+	.read = skl_dbg_event_read,
+	.llseek = default_llseek,
+};
+
+static int skl_init_dbg_event(struct skl_debug *d)
+{
+	if (!debugfs_create_file("dbg_event", 0644, d->fs, d,
+				&skl_dbg_event_fops)) {
+		dev_err(d->dev, "dbg_event debugfs file creation failed\n");
+		return -EIO;
+	}
+
+	return 0;
+}
+
 struct skl_debug *skl_debugfs_init(struct skl *skl)
 {
 	struct skl_debug *d;
+	int ret;
 
 	d = devm_kzalloc(&skl->pci->dev, sizeof(*d), GFP_KERNEL);
 	if (!d)
@@ -865,6 +938,13 @@ struct skl_debug *skl_debugfs_init(struct skl *skl)
 	skl_init_adsp(d);
 	skl_init_mod_set_get(d);
 
+	ret = skl_init_dbg_event(d);
+	if (ret < 0) {
+		dev_err(&skl->pci->dev,
+			"dbg_event debugfs init failed, ret = %d\n", ret);
+		goto err;
+	}
+
 	return d;
 
 err:
diff --git a/sound/soc/intel/skylake/skl-messages.c b/sound/soc/intel/skylake/skl-messages.c
index 2c0cf7a96128..31384afe42b3 100644
--- a/sound/soc/intel/skylake/skl-messages.c
+++ b/sound/soc/intel/skylake/skl-messages.c
@@ -2265,6 +2265,7 @@ int skl_create_pipeline(struct skl_sst *ctx, struct skl_pipe *pipe)
 	}
 
 	pipe->state = SKL_PIPE_CREATED;
+	skl_dbg_event(ctx, pipe->state);
 
 	return 0;
 }
@@ -2303,6 +2304,7 @@ int skl_delete_pipe(struct skl_sst *ctx, struct skl_pipe *pipe)
 	}
 
 	pipe->state = SKL_PIPE_INVALID;
+	skl_dbg_event(ctx, pipe->state);
 
 	return ret;
 }
diff --git a/sound/soc/intel/skylake/skl.h b/sound/soc/intel/skylake/skl.h
index 10a414d77cb2..66f34ceae74e 100644
--- a/sound/soc/intel/skylake/skl.h
+++ b/sound/soc/intel/skylake/skl.h
@@ -170,6 +170,7 @@ void skl_debug_init_module(struct skl_debug *d,
 struct nhlt_specific_cfg
 *skl_nhlt_get_debugfs_blob(struct skl_debug *d, u8 link_type, u32 instance,
 			u8 stream);
+void skl_dbg_event(struct skl_sst *ctx, int type);
 #else
 static inline struct skl_debug *skl_debugfs_init(struct skl *skl)
 {
@@ -185,6 +186,9 @@ static inline struct nhlt_specific_cfg
 {
 	return NULL;
 }
+void skl_dbg_event(struct skl_sst *ctx, int type)
+{
+}
 #endif
 
 #endif /* __SOUND_SOC_SKL_H */
-- 
2.19.1