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a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1770052636; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QV89xPUnCNJIH6v1OPSMlUsAUmfkwSqBeHfnsysjb1c=; b=WXrKTNGu2IL5kjR/LClZWlwtmFpEIHePi7wFIQ+uXeYjl1ZSbjgQgmseoo5ZX5xI1RE2vr fwOxfTe0UFG2jhfQOWQlbgiw7Bv45DVm+YZZGq89LZH2dzepuuDX9FXdzyGUi8njcPeOFZ JjAbomyZH92oUh0OCyaK3/VBnDrOcVA= X-Mailman-Original-Authentication-Results: smtp3.osuosl.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com X-Mailman-Original-Authentication-Results: smtp3.osuosl.org; dkim=pass (1024-bit key, unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256 header.s=mimecast20190719 header.b=WXrKTNGu Subject: [Intel-wired-lan] [PATCH net-next v4 3/9] dpll: Add notifier chain for dpll events X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eric Dumazet , Tony Nguyen , Leon Romanovsky , Alexander Lobakin , linux-rdma@vger.kernel.org, Przemek Kitszel , Arkadiusz Kubalewski , intel-wired-lan@lists.osuosl.org, Jakub Kicinski , Paolo Abeni , Jiri Pirko , Richard Cochran , Prathosh Satish , Vadim Fedorenko , Mark Bloch , linux-kernel@vger.kernel.org, Tariq Toukan , Andrew Lunn , Jonathan Lemon , Saeed Mahameed , "David S. Miller" Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" From: Petr Oros Currently, the DPLL subsystem reports events (creation, deletion, changes) to userspace via Netlink. However, there is no mechanism for other kernel components to be notified of these events directly. Add a raw notifier chain to the DPLL core protected by dpll_lock. This allows other kernel subsystems or drivers to register callbacks and receive notifications when DPLL devices or pins are created, deleted, or modified. Define the following: - Registration helpers: {,un}register_dpll_notifier() - Event types: DPLL_DEVICE_CREATED, DPLL_PIN_CREATED, etc. - Context structures: dpll_{device,pin}_notifier_info to pass relevant data to the listeners. The notification chain is invoked alongside the existing Netlink event generation to ensure in-kernel listeners are kept in sync with the subsystem state. Reviewed-by: Vadim Fedorenko Co-developed-by: Ivan Vecera Signed-off-by: Ivan Vecera Signed-off-by: Petr Oros --- drivers/dpll/dpll_core.c | 57 +++++++++++++++++++++++++++++++++++++ drivers/dpll/dpll_core.h | 4 +++ drivers/dpll/dpll_netlink.c | 6 ++++ include/linux/dpll.h | 29 +++++++++++++++++++ 4 files changed, 96 insertions(+) diff --git a/drivers/dpll/dpll_core.c b/drivers/dpll/dpll_core.c index f04ed7195cadd..b05fe2ba46d91 100644 --- a/drivers/dpll/dpll_core.c +++ b/drivers/dpll/dpll_core.c @@ -23,6 +23,8 @@ DEFINE_MUTEX(dpll_lock); DEFINE_XARRAY_FLAGS(dpll_device_xa, XA_FLAGS_ALLOC); DEFINE_XARRAY_FLAGS(dpll_pin_xa, XA_FLAGS_ALLOC); +static RAW_NOTIFIER_HEAD(dpll_notifier_chain); + static u32 dpll_device_xa_id; static u32 dpll_pin_xa_id; @@ -46,6 +48,39 @@ struct dpll_pin_registration { void *cookie; }; +static int call_dpll_notifiers(unsigned long action, void *info) +{ + lockdep_assert_held(&dpll_lock); + return raw_notifier_call_chain(&dpll_notifier_chain, action, info); +} + +void dpll_device_notify(struct dpll_device *dpll, unsigned long action) +{ + struct dpll_device_notifier_info info = { + .dpll = dpll, + .id = dpll->id, + .idx = dpll->device_idx, + .clock_id = dpll->clock_id, + .type = dpll->type, + }; + + call_dpll_notifiers(action, &info); +} + +void dpll_pin_notify(struct dpll_pin *pin, unsigned long action) +{ + struct dpll_pin_notifier_info info = { + .pin = pin, + .id = pin->id, + .idx = pin->pin_idx, + .clock_id = pin->clock_id, + .fwnode = pin->fwnode, + .prop = &pin->prop, + }; + + call_dpll_notifiers(action, &info); +} + struct dpll_device *dpll_device_get_by_id(int id) { if (xa_get_mark(&dpll_device_xa, id, DPLL_REGISTERED)) @@ -539,6 +574,28 @@ void dpll_netdev_pin_clear(struct net_device *dev) } EXPORT_SYMBOL(dpll_netdev_pin_clear); +int register_dpll_notifier(struct notifier_block *nb) +{ + int ret; + + mutex_lock(&dpll_lock); + ret = raw_notifier_chain_register(&dpll_notifier_chain, nb); + mutex_unlock(&dpll_lock); + return ret; +} +EXPORT_SYMBOL_GPL(register_dpll_notifier); + +int unregister_dpll_notifier(struct notifier_block *nb) +{ + int ret; + + mutex_lock(&dpll_lock); + ret = raw_notifier_chain_unregister(&dpll_notifier_chain, nb); + mutex_unlock(&dpll_lock); + return ret; +} +EXPORT_SYMBOL_GPL(unregister_dpll_notifier); + /** * dpll_pin_get - find existing or create new dpll pin * @clock_id: clock_id of creator diff --git a/drivers/dpll/dpll_core.h b/drivers/dpll/dpll_core.h index d3e17ff0ecef0..b7b4bb251f739 100644 --- a/drivers/dpll/dpll_core.h +++ b/drivers/dpll/dpll_core.h @@ -91,4 +91,8 @@ struct dpll_pin_ref *dpll_xa_ref_dpll_first(struct xarray *xa_refs); extern struct xarray dpll_device_xa; extern struct xarray dpll_pin_xa; extern struct mutex dpll_lock; + +void dpll_device_notify(struct dpll_device *dpll, unsigned long action); +void dpll_pin_notify(struct dpll_pin *pin, unsigned long action); + #endif diff --git a/drivers/dpll/dpll_netlink.c b/drivers/dpll/dpll_netlink.c index 904199ddd1781..83cbd64abf5a4 100644 --- a/drivers/dpll/dpll_netlink.c +++ b/drivers/dpll/dpll_netlink.c @@ -761,17 +761,20 @@ dpll_device_event_send(enum dpll_cmd event, struct dpll_device *dpll) int dpll_device_create_ntf(struct dpll_device *dpll) { + dpll_device_notify(dpll, DPLL_DEVICE_CREATED); return dpll_device_event_send(DPLL_CMD_DEVICE_CREATE_NTF, dpll); } int dpll_device_delete_ntf(struct dpll_device *dpll) { + dpll_device_notify(dpll, DPLL_DEVICE_DELETED); return dpll_device_event_send(DPLL_CMD_DEVICE_DELETE_NTF, dpll); } static int __dpll_device_change_ntf(struct dpll_device *dpll) { + dpll_device_notify(dpll, DPLL_DEVICE_CHANGED); return dpll_device_event_send(DPLL_CMD_DEVICE_CHANGE_NTF, dpll); } @@ -829,16 +832,19 @@ dpll_pin_event_send(enum dpll_cmd event, struct dpll_pin *pin) int dpll_pin_create_ntf(struct dpll_pin *pin) { + dpll_pin_notify(pin, DPLL_PIN_CREATED); return dpll_pin_event_send(DPLL_CMD_PIN_CREATE_NTF, pin); } int dpll_pin_delete_ntf(struct dpll_pin *pin) { + dpll_pin_notify(pin, DPLL_PIN_DELETED); return dpll_pin_event_send(DPLL_CMD_PIN_DELETE_NTF, pin); } int __dpll_pin_change_ntf(struct dpll_pin *pin) { + dpll_pin_notify(pin, DPLL_PIN_CHANGED); return dpll_pin_event_send(DPLL_CMD_PIN_CHANGE_NTF, pin); } diff --git a/include/linux/dpll.h b/include/linux/dpll.h index f2e8660e90cdf..8ed90dfc65f05 100644 --- a/include/linux/dpll.h +++ b/include/linux/dpll.h @@ -11,6 +11,7 @@ #include #include #include +#include #include struct dpll_device; @@ -172,6 +173,30 @@ struct dpll_pin_properties { u32 phase_gran; }; +#define DPLL_DEVICE_CREATED 1 +#define DPLL_DEVICE_DELETED 2 +#define DPLL_DEVICE_CHANGED 3 +#define DPLL_PIN_CREATED 4 +#define DPLL_PIN_DELETED 5 +#define DPLL_PIN_CHANGED 6 + +struct dpll_device_notifier_info { + struct dpll_device *dpll; + u32 id; + u32 idx; + u64 clock_id; + enum dpll_type type; +}; + +struct dpll_pin_notifier_info { + struct dpll_pin *pin; + u32 id; + u32 idx; + u64 clock_id; + const struct fwnode_handle *fwnode; + const struct dpll_pin_properties *prop; +}; + #if IS_ENABLED(CONFIG_DPLL) void dpll_netdev_pin_set(struct net_device *dev, struct dpll_pin *dpll_pin); void dpll_netdev_pin_clear(struct net_device *dev); @@ -242,4 +267,8 @@ int dpll_device_change_ntf(struct dpll_device *dpll); int dpll_pin_change_ntf(struct dpll_pin *pin); +int register_dpll_notifier(struct notifier_block *nb); + +int unregister_dpll_notifier(struct notifier_block *nb); + #endif -- 2.52.0