From patchwork Thu Oct 24 09:25:44 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Karl.Li" X-Patchwork-Id: 13848645 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 C1504CDDE69 for ; Thu, 24 Oct 2024 09:39:32 +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:Content-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:CC:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=jYLMF+xuWoTGHcH9ioamHRWs7pVJoNmieRacljrkDBI=; b=mSF/UYu3Uxtpsy31GLGs7R3Xik sX5RaeCarW/XDvQRLYrd4C0kxTu+zm/BwsA1XqTJRs1NfReiG1z+vOb7CHnUJAw6tw7wBwbwjtfga Pi5PUxWM7an6UUH4x4vuXKKZLHGKRu9zO2pxpbaAEx1u+tOyEapp4m0QUZwIiXOBldXWbNzYRbVrP /CghE2C3I+m8evriUbV4hBbP+So+qJbkaZpoR3AFEHvZxEIhzEoncag/4JMS7bpluL6U+Fz9mPUtE +SH9RGaXBUuB/WcZQxj8eN10kDIEo6/EfszQc/CJzYjNimmMbqXtc0mriCAnKO1/VZWNYEl9aooVm 4mohb7zA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1t3uJL-0000000HVQj-2gRw; Thu, 24 Oct 2024 09:39:19 +0000 Received: from mailgw01.mediatek.com ([216.200.240.184]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1t3u7L-0000000HS9G-0eHJ; Thu, 24 Oct 2024 09:26:56 +0000 X-UUID: 1a28b91e91ea11ef82ff63e91e7eb18c-20241024 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Type:Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=jYLMF+xuWoTGHcH9ioamHRWs7pVJoNmieRacljrkDBI=; b=S1kKsfzPV4SMDDCjHtAKPvaGnPatn91PyW101KSkPMqg7/1cYS6zYsXYcFw/6tThIfygzCEW16FpZVwsuL37gCgSirZvU6qGs0oDR5Pkqis30rlxfc2yB5zpbMJZMl5KvG9P8N1rOgom6wg/TwjL7xrY+6ehwsLMNVwRUGqCjPY=; X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.1.42,REQID:e8f51126-9a82-4a88-b7e8-b7c4798bf40a,IP:0,U RL:0,TC:0,Content:0,EDM:0,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTION: release,TS:0 X-CID-META: VersionHash:b0fcdc3,CLOUDID:25a1c441-8751-41b2-98dd-475503d45150,B ulkID:nil,BulkQuantity:0,Recheck:0,SF:102,TC:nil,Content:0,EDM:-3,IP:nil,U RL:11|1,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL:0,OSI:0,OSA:0,AV:0,LES :1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 0 X-CID-BAS: 0,_,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR,TF_CID_SPAM_ULN X-UUID: 1a28b91e91ea11ef82ff63e91e7eb18c-20241024 Received: from mtkmbs13n1.mediatek.inc [(172.21.101.193)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-GCM-SHA384 256/256) with ESMTP id 1188694862; Thu, 24 Oct 2024 02:26:51 -0700 Received: from mtkmbs11n2.mediatek.inc (172.21.101.187) by mtkmbs11n1.mediatek.inc (172.21.101.185) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1118.26; Thu, 24 Oct 2024 17:26:49 +0800 Received: from mtksitap99.mediatek.inc (10.233.130.16) by mtkmbs11n2.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.2.1118.26 via Frontend Transport; Thu, 24 Oct 2024 17:26:49 +0800 From: Karl.Li To: Jassi Brar , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Matthias Brugger , AngeloGioacchino Del Regno , Karl Li CC: , , , , Chungying Lu , , Karl Li Subject: [PATCH 2/3] mailbox: add support for bottom half received data Date: Thu, 24 Oct 2024 17:25:44 +0800 Message-ID: <20241024092608.431581-3-karl.li@mediatek.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20241024092608.431581-1-karl.li@mediatek.com> References: <20241024092608.431581-1-karl.li@mediatek.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241024_022655_223979_9BCCE467 X-CRM114-Status: GOOD ( 15.33 ) 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 From: Karl Li Within the MediaTek APU subsystem, a message passing mechanism is constructed on top of the mailbox system. The mailbox only has limited space for each message. The MTK APU firmware expects the message header from the mailbox, while the message body is passed through some fixed shared memory. The mailbox interrupt also serves as a mutex for the shared memory. Thus the interrupt may only be cleared after the message is handled. Add a new sleepable rx callback for mailbox clients for cases where handling the incoming data needs to sleep. Signed-off-by: Karl Li --- drivers/mailbox/mailbox.c | 16 ++++++++++++++++ include/linux/mailbox_client.h | 2 ++ include/linux/mailbox_controller.h | 1 + 3 files changed, 19 insertions(+) diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c index d3d26a2c9895..d58a77fcf804 100644 --- a/drivers/mailbox/mailbox.c +++ b/drivers/mailbox/mailbox.c @@ -164,6 +164,22 @@ void mbox_chan_received_data(struct mbox_chan *chan, void *mssg) } EXPORT_SYMBOL_GPL(mbox_chan_received_data); +/** + * mbox_chan_received_data_bh - A way for controller driver to push data + * received from remote to the upper layer. + * @chan: Pointer to the mailbox channel on which RX happened. + * @mssg: Client specific message typecasted as void * + * + * For the operations which is not atomic can be called from + * mbox_chan_received_data_bh(). + */ +void mbox_chan_received_data_bh(struct mbox_chan *chan, void *mssg) +{ + if (chan->cl->rx_callback_bh) + chan->cl->rx_callback_bh(chan->cl, mssg); +} +EXPORT_SYMBOL_GPL(mbox_chan_received_data_bh); + /** * mbox_chan_txdone - A way for controller driver to notify the * framework that the last TX has completed. diff --git a/include/linux/mailbox_client.h b/include/linux/mailbox_client.h index 734694912ef7..2cc6fa4e1bf9 100644 --- a/include/linux/mailbox_client.h +++ b/include/linux/mailbox_client.h @@ -22,6 +22,7 @@ struct mbox_chan; * if the client receives some ACK packet for transmission. * Unused if the controller already has TX_Done/RTR IRQ. * @rx_callback: Atomic callback to provide client the data received + * @rx_callback_bh: Non-atomic callback to provide client the data received * @tx_prepare: Atomic callback to ask client to prepare the payload * before initiating the transmission if required. * @tx_done: Atomic callback to tell client of data transmission @@ -33,6 +34,7 @@ struct mbox_client { bool knows_txdone; void (*rx_callback)(struct mbox_client *cl, void *mssg); + void (*rx_callback_bh)(struct mbox_client *cl, void *mssg); void (*tx_prepare)(struct mbox_client *cl, void *mssg); void (*tx_done)(struct mbox_client *cl, void *mssg, int r); }; diff --git a/include/linux/mailbox_controller.h b/include/linux/mailbox_controller.h index 6fee33cb52f5..74c6a31cd313 100644 --- a/include/linux/mailbox_controller.h +++ b/include/linux/mailbox_controller.h @@ -130,6 +130,7 @@ struct mbox_chan { int mbox_controller_register(struct mbox_controller *mbox); /* can sleep */ void mbox_controller_unregister(struct mbox_controller *mbox); /* can sleep */ void mbox_chan_received_data(struct mbox_chan *chan, void *data); /* atomic */ +void mbox_chan_received_data_bh(struct mbox_chan *chan, void *data); /* can sleep */ void mbox_chan_txdone(struct mbox_chan *chan, int r); /* atomic */ int devm_mbox_controller_register(struct device *dev,