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Message-Id: <20220626192444.29321-3-vfedorenko@novek.ru>
Date: Sun, 26 Jun 2022 22:24:43 +0300
From: Vadim Fedorenko <vfedorenko@...ek.ru>
To: Jakub Kicinski <kuba@...nel.org>,
Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>,
Jonathan Lemon <jonathan.lemon@...il.com>
Cc: Vadim Fedorenko <vadfed@...com>, Aya Levin <ayal@...dia.com>,
netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-clk@...r.kernel.org
Subject: [RFC PATCH v2 2/3] dpll: add netlink events
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);
+
+ 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);
+
int __init dpll_netlink_init(void);
void dpll_netlink_finish(void);
--
2.27.0
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