From patchwork Mon Dec 19 22:58:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Elliot Berman X-Patchwork-Id: 635148 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 883D2C46467 for ; Mon, 19 Dec 2022 23:00:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232798AbiLSXAm (ORCPT ); Mon, 19 Dec 2022 18:00:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53338 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232694AbiLSXAZ (ORCPT ); Mon, 19 Dec 2022 18:00:25 -0500 Received: from alexa-out-sd-01.qualcomm.com (alexa-out-sd-01.qualcomm.com [199.106.114.38]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 18DAB9FC5; Mon, 19 Dec 2022 15:00:24 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1671490824; x=1703026824; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=YxDkMMxk4hLAAcLgoVzs4Svd1kqGk6cNpGFHgig5IxQ=; b=QxqZn8y44kUit8qHxrfMaZPoc8SyeU1dOCsbtp5aFpWIDrXeFUWHfpkw 4vh/xILOcnP1CkC2seKAZPvo2kUfXf5j5qFnJg9naGuyo2/pqRb7KiEyo skS8DJshKsrP2VyUkhUJP01mgxkaSGLh5VVCHjfC3JZMXaVmfhXTD7JYs c=; Received: from unknown (HELO ironmsg04-sd.qualcomm.com) ([10.53.140.144]) by alexa-out-sd-01.qualcomm.com with ESMTP; 19 Dec 2022 15:00:24 -0800 X-QCInternal: smtphost Received: from nasanex01b.na.qualcomm.com ([10.46.141.250]) by ironmsg04-sd.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Dec 2022 15:00:23 -0800 Received: from hu-eberman-lv.qualcomm.com (10.49.16.6) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.36; Mon, 19 Dec 2022 15:00:23 -0800 From: Elliot Berman To: Bjorn Andersson , Jassi Brar , Sudeep Holla CC: Elliot Berman , Murali Nalajala , Trilok Soni , "Srivatsa Vaddagiri" , Carl van Schaik , Prakruthi Deepak Heragu , Arnd Bergmann , Greg Kroah-Hartman , Rob Herring , "Krzysztof Kozlowski" , Jonathan Corbet , Bagas Sanjaya , Catalin Marinas , Will Deacon , Mark Rutland , Lorenzo Pieralisi , "Dmitry Baryshkov" , , , , , , Subject: [PATCH v8 07/28] mailbox: Allow direct registration to a channel Date: Mon, 19 Dec 2022 14:58:28 -0800 Message-ID: <20221219225850.2397345-8-quic_eberman@quicinc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221219225850.2397345-1-quic_eberman@quicinc.com> References: <20221219225850.2397345-1-quic_eberman@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.49.16.6] X-ClientProxiedBy: nalasex01c.na.qualcomm.com (10.47.97.35) To nasanex01b.na.qualcomm.com (10.46.141.250) Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Support virtual mailbox controllers and clients which are not platform devices or come from the devicetree by allowing them to match client to channel via some other mechanism. Signed-off-by: Elliot Berman --- drivers/mailbox/mailbox.c | 96 ++++++++++++++++++++++++---------- drivers/mailbox/omap-mailbox.c | 18 ++----- drivers/mailbox/pcc.c | 18 ++----- include/linux/mailbox_client.h | 1 + 4 files changed, 76 insertions(+), 57 deletions(-) diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c index 4229b9b5da98..adf36c05fa43 100644 --- a/drivers/mailbox/mailbox.c +++ b/drivers/mailbox/mailbox.c @@ -317,6 +317,71 @@ int mbox_flush(struct mbox_chan *chan, unsigned long timeout) } EXPORT_SYMBOL_GPL(mbox_flush); +static int __mbox_bind_client(struct mbox_chan *chan, struct mbox_client *cl) +{ + struct device *dev = cl->dev; + unsigned long flags; + int ret; + + if (chan->cl || !try_module_get(chan->mbox->dev->driver->owner)) { + dev_dbg(dev, "%s: mailbox not free\n", __func__); + return -EBUSY; + } + + spin_lock_irqsave(&chan->lock, flags); + chan->msg_free = 0; + chan->msg_count = 0; + chan->active_req = NULL; + chan->cl = cl; + init_completion(&chan->tx_complete); + + if (chan->txdone_method == TXDONE_BY_POLL && cl->knows_txdone) + chan->txdone_method = TXDONE_BY_ACK; + + spin_unlock_irqrestore(&chan->lock, flags); + + if (chan->mbox->ops->startup) { + ret = chan->mbox->ops->startup(chan); + + if (ret) { + dev_err(dev, "Unable to startup the chan (%d)\n", ret); + mbox_free_channel(chan); + return ret; + } + } + + return 0; +} + +/** + * mbox_bind_client - Request a mailbox channel. + * @chan: The mailbox channel to bind the client to. + * @cl: Identity of the client requesting the channel. + * + * The Client specifies its requirements and capabilities while asking for + * a mailbox channel. It can't be called from atomic context. + * The channel is exclusively allocated and can't be used by another + * client before the owner calls mbox_free_channel. + * After assignment, any packet received on this channel will be + * handed over to the client via the 'rx_callback'. + * The framework holds reference to the client, so the mbox_client + * structure shouldn't be modified until the mbox_free_channel returns. + * + * Return: 0 if the channel was assigned to the client successfully. + * <0 for request failure. + */ +int mbox_bind_client(struct mbox_chan *chan, struct mbox_client *cl) +{ + int ret; + + mutex_lock(&con_mutex); + ret = __mbox_bind_client(chan, cl); + mutex_unlock(&con_mutex); + + return ret; +} +EXPORT_SYMBOL_GPL(mbox_bind_client); + /** * mbox_request_channel - Request a mailbox channel. * @cl: Identity of the client requesting the channel. @@ -340,7 +405,6 @@ struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index) struct mbox_controller *mbox; struct of_phandle_args spec; struct mbox_chan *chan; - unsigned long flags; int ret; if (!dev || !dev->of_node) { @@ -372,33 +436,9 @@ struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index) return chan; } - if (chan->cl || !try_module_get(mbox->dev->driver->owner)) { - dev_dbg(dev, "%s: mailbox not free\n", __func__); - mutex_unlock(&con_mutex); - return ERR_PTR(-EBUSY); - } - - spin_lock_irqsave(&chan->lock, flags); - chan->msg_free = 0; - chan->msg_count = 0; - chan->active_req = NULL; - chan->cl = cl; - init_completion(&chan->tx_complete); - - if (chan->txdone_method == TXDONE_BY_POLL && cl->knows_txdone) - chan->txdone_method = TXDONE_BY_ACK; - - spin_unlock_irqrestore(&chan->lock, flags); - - if (chan->mbox->ops->startup) { - ret = chan->mbox->ops->startup(chan); - - if (ret) { - dev_err(dev, "Unable to startup the chan (%d)\n", ret); - mbox_free_channel(chan); - chan = ERR_PTR(ret); - } - } + ret = __mbox_bind_client(chan, cl); + if (ret) + chan = ERR_PTR(ret); mutex_unlock(&con_mutex); return chan; diff --git a/drivers/mailbox/omap-mailbox.c b/drivers/mailbox/omap-mailbox.c index 098c82d87137..711a56ec8592 100644 --- a/drivers/mailbox/omap-mailbox.c +++ b/drivers/mailbox/omap-mailbox.c @@ -441,21 +441,9 @@ struct mbox_chan *omap_mbox_request_channel(struct mbox_client *cl, if (!mbox || !mbox->chan) return ERR_PTR(-ENOENT); - chan = mbox->chan; - spin_lock_irqsave(&chan->lock, flags); - chan->msg_free = 0; - chan->msg_count = 0; - chan->active_req = NULL; - chan->cl = cl; - init_completion(&chan->tx_complete); - spin_unlock_irqrestore(&chan->lock, flags); - - ret = chan->mbox->ops->startup(chan); - if (ret) { - pr_err("Unable to startup the chan (%d)\n", ret); - mbox_free_channel(chan); - chan = ERR_PTR(ret); - } + ret = mbox_bind_client(mbox->chan, cl); + if (ret) + return ERR_PTR(ret); return chan; } diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c index 3c2bc0ca454c..f655be083369 100644 --- a/drivers/mailbox/pcc.c +++ b/drivers/mailbox/pcc.c @@ -283,7 +283,7 @@ pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id) struct pcc_chan_info *pchan; struct mbox_chan *chan; struct device *dev; - unsigned long flags; + int rc; if (subspace_id < 0 || subspace_id >= pcc_chan_count) return ERR_PTR(-ENOENT); @@ -296,21 +296,11 @@ pcc_mbox_request_channel(struct mbox_client *cl, int subspace_id) } dev = chan->mbox->dev; - spin_lock_irqsave(&chan->lock, flags); - chan->msg_free = 0; - chan->msg_count = 0; - chan->active_req = NULL; - chan->cl = cl; - init_completion(&chan->tx_complete); - - if (chan->txdone_method == TXDONE_BY_POLL && cl->knows_txdone) - chan->txdone_method = TXDONE_BY_ACK; - - spin_unlock_irqrestore(&chan->lock, flags); + rc = mbox_bind_client(chan, cl); + if (rc) + return ERR_PTR(rc); if (pchan->plat_irq > 0) { - int rc; - rc = devm_request_irq(dev, pchan->plat_irq, pcc_mbox_irq, 0, MBOX_IRQ_NAME, chan); if (unlikely(rc)) { diff --git a/include/linux/mailbox_client.h b/include/linux/mailbox_client.h index 65229a45590f..734694912ef7 100644 --- a/include/linux/mailbox_client.h +++ b/include/linux/mailbox_client.h @@ -37,6 +37,7 @@ struct mbox_client { void (*tx_done)(struct mbox_client *cl, void *mssg, int r); }; +int mbox_bind_client(struct mbox_chan *chan, struct mbox_client *cl); struct mbox_chan *mbox_request_channel_byname(struct mbox_client *cl, const char *name); struct mbox_chan *mbox_request_channel(struct mbox_client *cl, int index);