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Message-ID: <DM6PR11MB46573FA8D51D40DAD2AC060B9B879@DM6PR11MB4657.namprd11.prod.outlook.com>
Date: Mon, 11 Jul 2022 09:02:28 +0000
From: "Kubalewski, Arkadiusz" <arkadiusz.kubalewski@...el.com>
To: Vadim Fedorenko <vfedorenko@...ek.ru>,
Jakub Kicinski <kuba@...nel.org>,
Jonathan Lemon <jonathan.lemon@...il.com>
CC: Vadim Fedorenko <vadfed@...com>, Aya Levin <ayal@...dia.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-clk@...r.kernel.org" <linux-clk@...r.kernel.org>
Subject: RE: [RFC PATCH v2 2/3] dpll: add netlink events
-----Original Message-----
From: Vadim Fedorenko <vfedorenko@...ek.ru>
Sent: Sunday, June 26, 2022 9:25 PM
>
>From: Vadim Fedorenko <vadfed@...com>
>
>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 <vadfed@...com>
>---
> 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.
>+
>+ 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.
>+
> int __init dpll_netlink_init(void);
> void dpll_netlink_finish(void);
>--
>2.27.0
>
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