From patchwork Fri Jun 26 14:46:59 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deepak Kumar Singh X-Patchwork-Id: 11627713 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9BACB14E3 for ; Fri, 26 Jun 2020 14:47:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7F9362053B for ; Fri, 26 Jun 2020 14:47:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="IDWqOeR3" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729405AbgFZOr2 (ORCPT ); Fri, 26 Jun 2020 10:47:28 -0400 Received: from mail29.static.mailgun.info ([104.130.122.29]:39967 "EHLO mail29.static.mailgun.info" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729407AbgFZOrZ (ORCPT ); Fri, 26 Jun 2020 10:47:25 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1593182844; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=B4n9r+xdCvV52+OhcuwhLgh4BajiH4rVAxbO9eD/Pok=; b=IDWqOeR3Ed//uW/7xQCfGAR4s9eMXJrWvO5L/n7ZrTTAVX5EBs46LXw16FpO0J9lT87gr1K9 z7LSi7ZK2WOT7/hivHks8GCqiGQRbnLVYzFc6Q9hCLQtB7q/uT8PTIN+9FzJmKqjAWhFvgsF keeGHa8kts/xLIYxoVBgaREnYk8= X-Mailgun-Sending-Ip: 104.130.122.29 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n04.prod.us-east-1.postgun.com with SMTP id 5ef60a7c356bcc26ab20b0f6 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Fri, 26 Jun 2020 14:47:24 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 91A9FC433C8; Fri, 26 Jun 2020 14:47:23 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from deesin-linux.qualcomm.com (blr-c-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: deesin) by smtp.codeaurora.org (Postfix) with ESMTPSA id B7690C43395; Fri, 26 Jun 2020 14:47:20 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org B7690C43395 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=deesin@codeaurora.org From: Deepak Kumar Singh To: bjorn.andersson@linaro.org, clew@codeaurora.org, mathieu.poirier@linaro.org Cc: linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, Arun Kumar Neelakantam , Deepak Kumar Singh Subject: [PATCH V6 4/4] rpmsg: char: Add signal callback and POLLPRI support Date: Fri, 26 Jun 2020 20:16:59 +0530 Message-Id: <1593182819-30747-5-git-send-email-deesin@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1593182819-30747-1-git-send-email-deesin@codeaurora.org> References: <1593182819-30747-1-git-send-email-deesin@codeaurora.org> Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Arun Kumar Neelakantam Register a callback to get the signal notifications from rpmsg and send POLLPRI mask to indicate the signal change in POLL system call. Signed-off-by: Deepak Kumar Singh Signed-off-by: Arun Kumar Neelakantam --- drivers/rpmsg/rpmsg_char.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c index 43ceac0..64506ca 100644 --- a/drivers/rpmsg/rpmsg_char.c +++ b/drivers/rpmsg/rpmsg_char.c @@ -64,6 +64,7 @@ struct rpmsg_ctrldev { * @queue_lock: synchronization of @queue operations * @queue: incoming message queue * @readq: wait object for incoming queue + * @sig_pending:state of signal notification */ struct rpmsg_eptdev { struct device dev; @@ -78,6 +79,8 @@ struct rpmsg_eptdev { spinlock_t queue_lock; struct sk_buff_head queue; wait_queue_head_t readq; + + bool sig_pending; }; static int rpmsg_eptdev_destroy(struct device *dev, void *data) @@ -122,6 +125,19 @@ static int rpmsg_ept_cb(struct rpmsg_device *rpdev, void *buf, int len, return 0; } +static int rpmsg_sigs_cb(struct rpmsg_device *rpdev, void *priv, + u32 old, u32 new) +{ + struct rpmsg_eptdev *eptdev = priv; + + eptdev->sig_pending = true; + + /* wake up any blocking processes, waiting for signal notification */ + wake_up_interruptible(&eptdev->readq); + return 0; +} + + static int rpmsg_eptdev_open(struct inode *inode, struct file *filp) { struct rpmsg_eptdev *eptdev = cdev_to_eptdev(inode->i_cdev); @@ -138,6 +154,7 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp) return -EINVAL; } + ept->sig_cb = rpmsg_sigs_cb; eptdev->ept = ept; filp->private_data = eptdev; @@ -156,6 +173,7 @@ static int rpmsg_eptdev_release(struct inode *inode, struct file *filp) eptdev->ept = NULL; } mutex_unlock(&eptdev->ept_lock); + eptdev->sig_pending = false; /* Discard all SKBs */ skb_queue_purge(&eptdev->queue); @@ -266,6 +284,9 @@ static __poll_t rpmsg_eptdev_poll(struct file *filp, poll_table *wait) if (!skb_queue_empty(&eptdev->queue)) mask |= EPOLLIN | EPOLLRDNORM; + if (eptdev->sig_pending) + mask |= EPOLLPRI; + mask |= rpmsg_poll(eptdev->ept, filp, wait); return mask; @@ -309,6 +330,7 @@ static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd, switch (cmd) { case TIOCMGET: + eptdev->sig_pending = false; ret = rpmsg_get_signals(eptdev->ept); if (ret >= 0) ret = put_user(ret, (int __user *)arg);