-----Original Message-----
From: Vadim Fedorenko <redacted> 
Sent: Friday, July 15, 2022 1:29 AM

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On 11.07.2022 10:02, Kubalewski, Arkadiusz wrote:

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-----Original Message-----
From: Vadim Fedorenko <redacted>
Sent: Sunday, June 26, 2022 9:25 PM

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From: Vadim Fedorenko <redacted>

Add netlink interface to enable notification of users about
events in DPLL framework. Part of this interface should be
used by drivers directly, i.e. lock status changes.

Signed-off-by: Vadim Fedorenko <redacted>
---
drivers/dpll/dpll_core.c    |   2 +
drivers/dpll/dpll_netlink.c | 141 ++++++++++++++++++++++++++++++++++++
drivers/dpll/dpll_netlink.h |   7 ++
3 files changed, 150 insertions(+)

diff --git a/drivers/dpll/dpll_core.c b/drivers/dpll/dpll_core.c
index dc0330e3687d..387644aa910e 100644
--- a/drivers/dpll/dpll_core.c
+++ b/drivers/dpll/dpll_core.c

@@ -97,6 +97,8 @@ struct dpll_device *dpll_device_alloc(struct dpll_device_ops *ops, int sources_c

	mutex_unlock(&dpll_device_xa_lock);
	dpll->priv = priv;

+	dpll_notify_device_create(dpll->id, dev_name(&dpll->dev));
+
	return dpll;

error:

diff --git a/drivers/dpll/dpll_netlink.c b/drivers/dpll/dpll_netlink.c
index e15106f30377..4b1684fcf41e 100644
--- a/drivers/dpll/dpll_netlink.c
+++ b/drivers/dpll/dpll_netlink.c

@@ -48,6 +48,8 @@ struct param {

	int dpll_source_type;
	int dpll_output_id;
	int dpll_output_type;
+	int dpll_status;
+	const char *dpll_name;
};

struct dpll_dump_ctx {

@@ -239,6 +241,8 @@ static int dpll_genl_cmd_set_source(struct param *p)

	ret = dpll->ops->set_source_type(dpll, src_id, type);
	mutex_unlock(&dpll->lock);

+	dpll_notify_source_change(dpll->id, src_id, type);
+
	return ret;
}

@@ -262,6 +266,8 @@ static int dpll_genl_cmd_set_output(struct param *p)

	ret = dpll->ops->set_source_type(dpll, out_id, type);
	mutex_unlock(&dpll->lock);

+	dpll_notify_source_change(dpll->id, out_id, type);
+
	return ret;
}

@@ -438,6 +444,141 @@ static struct genl_family dpll_gnl_family __ro_after_init = {

	.pre_doit	= dpll_pre_doit,
};

+static int dpll_event_device_create(struct param *p)
+{
+	if (nla_put_u32(p->msg, DPLLA_DEVICE_ID, p->dpll_id) ||
+	    nla_put_string(p->msg, DPLLA_DEVICE_NAME, p->dpll_name))
+		return -EMSGSIZE;
+
+	return 0;
+}
+
+static int dpll_event_device_delete(struct param *p)
+{
+	if (nla_put_u32(p->msg, DPLLA_DEVICE_ID, p->dpll_id))
+		return -EMSGSIZE;
+
+	return 0;
+}
+
+static int dpll_event_status(struct param *p)
+{
+	if (nla_put_u32(p->msg, DPLLA_DEVICE_ID, p->dpll_id) ||
+		nla_put_u32(p->msg, DPLLA_LOCK_STATUS, p->dpll_status))
+		return -EMSGSIZE;
+
+	return 0;
+}
+
+static int dpll_event_source_change(struct param *p)
+{
+	if (nla_put_u32(p->msg, DPLLA_DEVICE_ID, p->dpll_id) ||
+	    nla_put_u32(p->msg, DPLLA_SOURCE_ID, p->dpll_source_id) ||
+		nla_put_u32(p->msg, DPLLA_SOURCE_TYPE, p->dpll_source_type))
+		return -EMSGSIZE;
+
+	return 0;
+}
+
+static int dpll_event_output_change(struct param *p)
+{
+	if (nla_put_u32(p->msg, DPLLA_DEVICE_ID, p->dpll_id) ||
+	    nla_put_u32(p->msg, DPLLA_OUTPUT_ID, p->dpll_output_id) ||
+		nla_put_u32(p->msg, DPLLA_OUTPUT_TYPE, p->dpll_output_type))
+		return -EMSGSIZE;
+
+	return 0;
+}
+
+static cb_t event_cb[] = {
+	[DPLL_EVENT_DEVICE_CREATE]	= dpll_event_device_create,
+	[DPLL_EVENT_DEVICE_DELETE]	= dpll_event_device_delete,
+	[DPLL_EVENT_STATUS_LOCKED]	= dpll_event_status,
+	[DPLL_EVENT_STATUS_UNLOCKED]	= dpll_event_status,
+	[DPLL_EVENT_SOURCE_CHANGE]	= dpll_event_source_change,
+	[DPLL_EVENT_OUTPUT_CHANGE]	= dpll_event_output_change,
+};
+/*
+ * Generic netlink DPLL event encoding
+ */
+static int dpll_send_event(enum dpll_genl_event event,
+				   struct param *p)
+{
+	struct sk_buff *msg;
+	int ret = -EMSGSIZE;
+	void *hdr;
+
+	msg = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+	p->msg = msg;
+
+	hdr = genlmsg_put(msg, 0, 0, &dpll_gnl_family, 0, event);
+	if (!hdr)
+		goto out_free_msg;
+
+	ret = event_cb[event](p);
+	if (ret)
+		goto out_cancel_msg;
+
+	genlmsg_end(msg, hdr);
+
+	genlmsg_multicast(&dpll_gnl_family, msg, 0, 1, GFP_KERNEL);

All multicasts are send only for group "1" (DPLL_CONFIG_SOURCE_GROUP_NAME),
but 4 groups were defined.

Yes, you are right! Will update it in the next round.

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+
+	return 0;
+
+out_cancel_msg:
+	genlmsg_cancel(msg, hdr);
+out_free_msg:
+	nlmsg_free(msg);
+
+	return ret;
+}
+
+int dpll_notify_device_create(int dpll_id, const char *name)
+{
+	struct param p = { .dpll_id = dpll_id, .dpll_name = name };
+
+	return dpll_send_event(DPLL_EVENT_DEVICE_CREATE, &p);
+}
+
+int dpll_notify_device_delete(int dpll_id)
+{
+	struct param p = { .dpll_id = dpll_id };
+
+	return dpll_send_event(DPLL_EVENT_DEVICE_DELETE, &p);
+}
+
+int dpll_notify_status_locked(int dpll_id)
+{
+	struct param p = { .dpll_id = dpll_id, .dpll_status = 1 };
+
+	return dpll_send_event(DPLL_EVENT_STATUS_LOCKED, &p);
+}
+
+int dpll_notify_status_unlocked(int dpll_id)
+{
+	struct param p = { .dpll_id = dpll_id, .dpll_status = 0 };
+
+	return dpll_send_event(DPLL_EVENT_STATUS_UNLOCKED, &p);
+}
+
+int dpll_notify_source_change(int dpll_id, int source_id, int source_type)
+{
+	struct param p =  { .dpll_id = dpll_id, .dpll_source_id = source_id,
+						.dpll_source_type = source_type };
+
+	return dpll_send_event(DPLL_EVENT_SOURCE_CHANGE, &p);
+}
+
+int dpll_notify_output_change(int dpll_id, int output_id, int output_type)
+{
+	struct param p =  { .dpll_id = dpll_id, .dpll_output_id = output_id,
+						.dpll_output_type = output_type };
+
+	return dpll_send_event(DPLL_EVENT_OUTPUT_CHANGE, &p);
+}
+
int __init dpll_netlink_init(void)
{
	return genl_register_family(&dpll_gnl_family);

diff --git a/drivers/dpll/dpll_netlink.h b/drivers/dpll/dpll_netlink.h
index e2d100f59dd6..0dc81320f982 100644
--- a/drivers/dpll/dpll_netlink.h
+++ b/drivers/dpll/dpll_netlink.h

@@ -3,5 +3,12 @@
  *  Copyright (c) 2021 Meta Platforms, Inc. and affiliates
  */

+int dpll_notify_device_create(int dpll_id, const char *name);
+int dpll_notify_device_delete(int dpll_id);
+int dpll_notify_status_locked(int dpll_id);
+int dpll_notify_status_unlocked(int dpll_id);
+int dpll_notify_source_change(int dpll_id, int source_id, int source_type);
+int dpll_notify_output_change(int dpll_id, int output_id, int output_type);

Only dpll_notify_device_create is actually used, rest is not.
I am getting confused a bit, who should call those "notify" functions?
It is straightforward for create/delete, dpll subsystem shall do it, but what
about the rest?
I would say notifications about status or source/output change shall originate
in the driver implementing dpll interface, thus they shall be exported and
defined in the header included by the driver.

I was thinking about driver too, because device can have different interfaces to 
configure source/output, and different notifications to update status. I will 
update ptp_ocp driver to implement this logic. And it will also cover question 
of exporting these functions and their definitions.

Great!

Thank,
Arkadiusz

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+
int __init dpll_netlink_init(void);
void dpll_netlink_finish(void);
-- 
2.27.0

Good day Vadim,

I just wanted to make sure I didn't miss anything through the spam filters or
something? We are still waiting for that github repo, or you were on
vacation/busy, right?

Thanks,
Arkadiusz