From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F354EC5B543 for ; Wed, 4 Jun 2025 21:07:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=9RX3r7Bx5o1Q2/rGqlcJBQQyh3bMhqlHYkTVbU9jdVo=; b=SPFjrfiWPkMLNPJgaqI2J3v7RT 9boZ5p6KFvs0+bezQdXCkSB4p/WsVY0kJ7hcZJoADXu3hHY4jIqFl8DMR9hiBivQUdAilpof8ecT8 O0QdW1jlLlWw+i5Wikx7/+df8+0CgfmcuVzhDnBIRgzA6q1Ixb2GpixYu0vuD+y9Xa5wAU8NE6TVi vEKCIF6yyrZf77OIcshqj3E/WwyYophgAzaxkjEHeR8pHQUxfn1Zn/KcxwKRnCOMySpgsQb3yNxw8 1LgXX9cEGTw1cR490ook11T3vFOVYrPYyQUiE9JTAaG02dkmyPnNzxDn5VrkM29StPy/8o5trfBFv g1F9Nywg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uMvK6-0000000EEWh-32BM; Wed, 04 Jun 2025 21:06:58 +0000 Received: from mgamail.intel.com ([198.175.65.14]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uMvI0-0000000EEDl-0HGK; Wed, 04 Jun 2025 21:04:49 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1749071088; x=1780607088; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=Ax0LaVdVrMdodaXbxHS1uMp0e5JdIRTqR6F8VUnG4bM=; b=mi/dcBHyJq3pbqA6akg8rTbhgYlACGJOYiJtvgnigBvGdbVBoi4aqj7L k3Y8GFL3B8add5IMqpN9wgoi5XI2KinteTPVGBZK5k9n8XZz1+72W9LcP T5x7DAU/nY0cHmkQRToGg1+JJxDG+b50pywBGzkb4kLK4PevAO8XLO+rt r/X2HJc4O0UeWG5FnYOShveKfG358W47z+pAW/5mgfwBNW0P+Iyhw/zFi jnUoaS7Rd1VTm5Pm4dUH3rCk6s14dQAO1k5nsUVtz/rI3DCohWI0U836J CcgOWBY3lQCpwsYEIuuDloJYF8dl2+W12rrXvb22MMnM7XV5/6qOb45SL A==; X-CSE-ConnectionGUID: HQChXKgHRqeTSit/MOU+vg== X-CSE-MsgGUID: 7PzsZKdWQH6rc59mJ6TWwg== X-IronPort-AV: E=McAfee;i="6800,10657,11454"; a="54971360" X-IronPort-AV: E=Sophos;i="6.16,210,1744095600"; d="scan'208";a="54971360" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by orvoesa106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Jun 2025 14:04:46 -0700 X-CSE-ConnectionGUID: 9nD5U/QeTjKVSwVuA2BoHA== X-CSE-MsgGUID: o9yLbTW1Tli1Atn+6utNZw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.16,210,1744095600"; d="scan'208";a="150458314" Received: from oandoniu-mobl3.ger.corp.intel.com (HELO kekkonen.fi.intel.com) ([10.245.245.208]) by fmviesa004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Jun 2025 14:04:42 -0700 Received: from kekkonen.localdomain (localhost [127.0.0.1]) by kekkonen.fi.intel.com (Postfix) with SMTP id 5809A11F83C; Thu, 5 Jun 2025 00:04:39 +0300 (EEST) Date: Wed, 4 Jun 2025 21:04:39 +0000 Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo From: Sakari Ailus To: Nicolas Dufresne Cc: Laurent Pinchart , Mauro Carvalho Chehab , Hans Verkuil , Tiffany Lin , Andrew-CT Chen , Yunfei Dong , Matthias Brugger , AngeloGioacchino Del Regno , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, kernel@collabora.com, linux-media@vger.kernel.org, Sebastian Fricke Subject: Re: [PATCH v3 1/5] media: mc: add manual request completion Message-ID: References: <20250604-sebastianfricke-vcodec_manual_request_completion_with_state_machine-v3-0-603db4749d90@collabora.com> <20250604-sebastianfricke-vcodec_manual_request_completion_with_state_machine-v3-1-603db4749d90@collabora.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250604-sebastianfricke-vcodec_manual_request_completion_with_state_machine-v3-1-603db4749d90@collabora.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250604_140448_157023_A7BFD48F X-CRM114-Status: GOOD ( 38.58 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Nicolas, Thanks for the update. On Wed, Jun 04, 2025 at 04:09:35PM -0400, Nicolas Dufresne wrote: > From: Hans Verkuil > > By default when the last request object is completed, the whole > request completes as well. > > But sometimes you want to delay this completion to an arbitrary point in > time so add a manual complete mode for this. > > In req_queue the driver marks the request for manual completion by > calling media_request_mark_manual_completion, and when the driver > wants to manually complete the request it calls > media_request_manual_complete(). > > Signed-off-by: Hans Verkuil > Signed-off-by: Nicolas Dufresne > --- > drivers/media/mc/mc-request.c | 38 ++++++++++++++++++++++++++++++++++++-- > include/media/media-request.h | 38 +++++++++++++++++++++++++++++++++++++- > 2 files changed, 73 insertions(+), 3 deletions(-) > > diff --git a/drivers/media/mc/mc-request.c b/drivers/media/mc/mc-request.c > index 5edfc2791ce7c7485def5db675bbf53ee223d837..398d0806d1d274eb8c454fc5c37b77476abe1e74 100644 > --- a/drivers/media/mc/mc-request.c > +++ b/drivers/media/mc/mc-request.c > @@ -54,6 +54,7 @@ static void media_request_clean(struct media_request *req) > req->access_count = 0; > WARN_ON(req->num_incomplete_objects); > req->num_incomplete_objects = 0; > + req->manual_completion = false; > wake_up_interruptible_all(&req->poll_wait); > } > > @@ -313,6 +314,7 @@ int media_request_alloc(struct media_device *mdev, int *alloc_fd) > req->mdev = mdev; > req->state = MEDIA_REQUEST_STATE_IDLE; > req->num_incomplete_objects = 0; > + req->manual_completion = false; > kref_init(&req->kref); > INIT_LIST_HEAD(&req->objects); > spin_lock_init(&req->lock); > @@ -459,7 +461,7 @@ void media_request_object_unbind(struct media_request_object *obj) > > req->num_incomplete_objects--; > if (req->state == MEDIA_REQUEST_STATE_QUEUED && > - !req->num_incomplete_objects) { > + !req->num_incomplete_objects && !req->manual_completion) { > req->state = MEDIA_REQUEST_STATE_COMPLETE; > completed = true; > wake_up_interruptible_all(&req->poll_wait); > @@ -488,7 +490,7 @@ void media_request_object_complete(struct media_request_object *obj) > WARN_ON(req->state != MEDIA_REQUEST_STATE_QUEUED)) > goto unlock; > > - if (!--req->num_incomplete_objects) { > + if (!--req->num_incomplete_objects && !req->manual_completion) { > req->state = MEDIA_REQUEST_STATE_COMPLETE; > wake_up_interruptible_all(&req->poll_wait); > completed = true; > @@ -499,3 +501,35 @@ void media_request_object_complete(struct media_request_object *obj) > media_request_put(req); > } > EXPORT_SYMBOL_GPL(media_request_object_complete); > + > +void media_request_manual_complete(struct media_request *req) > +{ > + unsigned long flags; I'd declare flags as last. > + bool completed = false; > + > + if (WARN_ON(!req)) > + return; > + if (WARN_ON(!req->manual_completion)) > + return; I think I'd use WARN_ON_ONCE() consistently: this is a driver (or framework) bug and telling once about it is very probably enough. > + > + spin_lock_irqsave(&req->lock, flags); > + if (WARN_ON(req->state != MEDIA_REQUEST_STATE_QUEUED)) > + goto unlock; > + > + req->manual_completion = false; > + /* > + * It is expected that all other objects in this request are > + * completed when this function is called. WARN if that is > + * not the case. > + */ > + if (!WARN_ON(req->num_incomplete_objects)) { > + req->state = MEDIA_REQUEST_STATE_COMPLETE; > + wake_up_interruptible_all(&req->poll_wait); > + completed = true; > + } A newline would be nice here. > +unlock: > + spin_unlock_irqrestore(&req->lock, flags); > + if (completed) > + media_request_put(req); > +} > +EXPORT_SYMBOL_GPL(media_request_manual_complete); > diff --git a/include/media/media-request.h b/include/media/media-request.h > index d4ac557678a78372222704400c8c96cf3150b9d9..7f9af68ef19ac6de0184bbb0c0827dc59777c6dc 100644 > --- a/include/media/media-request.h > +++ b/include/media/media-request.h > @@ -56,6 +56,9 @@ struct media_request_object; > * @access_count: count the number of request accesses that are in progress > * @objects: List of @struct media_request_object request objects > * @num_incomplete_objects: The number of incomplete objects in the request > + * @manual_completion: if true, then the request won't be marked as completed > + * when @num_incomplete_objects reaches 0. Call media_request_manual_complete() > + * to complete the request after @num_incomplete_objects == 0. > * @poll_wait: Wait queue for poll > * @lock: Serializes access to this struct > */ > @@ -68,6 +71,7 @@ struct media_request { > unsigned int access_count; > struct list_head objects; > unsigned int num_incomplete_objects; > + bool manual_completion; > wait_queue_head_t poll_wait; > spinlock_t lock; > }; > @@ -218,6 +222,38 @@ media_request_get_by_fd(struct media_device *mdev, int request_fd); > int media_request_alloc(struct media_device *mdev, > int *alloc_fd); > > +/** > + * media_request_mark_manual_completion - Enable manual completion > + * > + * @req: The request > + * > + * Mark that the request has to be manually completed by calling > + * media_request_manual_complete(). > + * > + * This function shall be called in the req_queue callback. > + */ > +static inline void > +media_request_mark_manual_completion(struct media_request *req) > +{ > + req->manual_completion = true; > +} > + > +/** > + * media_request_manual_complete - Mark the request as completed > + * > + * @req: The request > + * > + * This function completes a request that was marked for manual completion by an > + * earlier call to media_request_mark_manual_completion(). The request's > + * @manual_completion flag is reset to false. s/flag/field/ > + * > + * All objects contained in the request must have been completed previously. It > + * is an error to call this function otherwise. If such an error occurred, the > + * function will WARN and the object completion will be delayed until > + * @num_incomplete_objects is 0. > + */ > +void media_request_manual_complete(struct media_request *req); > + > #else > > static inline void media_request_get(struct media_request *req) > @@ -336,7 +372,7 @@ void media_request_object_init(struct media_request_object *obj); > * @req: The media request > * @ops: The object ops for this object > * @priv: A driver-specific priv pointer associated with this object > - * @is_buffer: Set to true if the object a buffer object. > + * @is_buffer: Set to true if the object is a buffer object. > * @obj: The object > * > * Bind this object to the request and set the ops and priv values of > -- Regards, Sakari Ailus