From patchwork Sat Apr 22 10:42:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sarannya S X-Patchwork-Id: 676172 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 28B26C7618E for ; Sat, 22 Apr 2023 10:43:21 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229668AbjDVKnS (ORCPT ); Sat, 22 Apr 2023 06:43:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55074 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229957AbjDVKnN (ORCPT ); Sat, 22 Apr 2023 06:43:13 -0400 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 348CD210A; Sat, 22 Apr 2023 03:43:01 -0700 (PDT) Received: from pps.filterd (m0279866.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 33MAghoe021721; Sat, 22 Apr 2023 10:42:53 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-type; s=qcppdkim1; bh=YNU3Q/AM+rg7Vgw9tA5vS01w82FENwNrKufTG7CL7wc=; b=JFnfsHwYS4EUA3K8YGXT1dF1/d40hlfsr4bzOdpSF3nvUdD4HXGgOAUIQSRARGIPmpzk VgLgHptcpO5M1/cYfBHPjciq3m/SraVk8Frr93PTrkg3Bt6RCl1ITF5z7WHxnaubpy6Q kLP6y6pJ1Tm4a1OsFa+0tP37SowJfKmBDKb9u7FSEtYw8rVecxRKHhxRRJ7sh/W9kKXt +SkEsstX7mDVUpISRUkGC7F9bIroGGaGqKcN5oBfkFJD4s2iSJkcSz6LdREF2qwHaCsE 1NtttERj+3zWM+w40XBmicGi4H5h3KgsyPF8rfxTXpGOaX2wENYq/jHpI+8YX1KuLHVl 7Q== Received: from nalasppmta04.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3q48vf89y0-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 22 Apr 2023 10:42:53 +0000 Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA04.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 33MAgq7I018014 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Sat, 22 Apr 2023 10:42:52 GMT Received: from sarannya-linux.qualcomm.com (10.80.80.8) by nalasex01b.na.qualcomm.com (10.47.209.197) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.42; Sat, 22 Apr 2023 03:42:48 -0700 From: Sarannya S To: , , , , CC: , , , Deepak Kumar Singh , Sarannya S , "Bjorn Andersson" Subject: [PATCH V7 3/3] rpmsg: char: Add RPMSG GET/SET FLOWCONTROL IOCTL support Date: Sat, 22 Apr 2023 16:12:07 +0530 Message-ID: <1682160127-18103-4-git-send-email-quic_sarannya@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1682160127-18103-1-git-send-email-quic_sarannya@quicinc.com> References: <1682160127-18103-1-git-send-email-quic_sarannya@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01b.na.qualcomm.com (10.47.209.197) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: H_itoK7NAT4ro014h5-bXNk_pwKU7XCa X-Proofpoint-ORIG-GUID: H_itoK7NAT4ro014h5-bXNk_pwKU7XCa X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-04-21_08,2023-04-21_01,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 malwarescore=0 priorityscore=1501 spamscore=0 mlxlogscore=999 phishscore=0 suspectscore=0 mlxscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2303200000 definitions=main-2304220094 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org From: Chris Lew Add RPMSG_GET_OUTGOING_FLOWCONTROL and RPMSG_SET_INCOMING_FLOWCONTROL IOCTL support for rpmsg char device nodes to get/set the low level transport signals. Signed-off-by: Chris Lew Signed-off-by: Deepak Kumar Singh Signed-off-by: Sarannya S --- drivers/rpmsg/rpmsg_char.c | 49 ++++++++++++++++++++++++++++++++++++++++------ include/uapi/linux/rpmsg.h | 11 ++++++++++- 2 files changed, 53 insertions(+), 7 deletions(-) diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c index a271fce..d50908f 100644 --- a/drivers/rpmsg/rpmsg_char.c +++ b/drivers/rpmsg/rpmsg_char.c @@ -23,6 +23,7 @@ #include #include #include +#include #include #include @@ -68,6 +69,8 @@ struct rpmsg_eptdev { struct sk_buff_head queue; wait_queue_head_t readq; + bool remote_flow; + bool remote_flow_updated; }; int rpmsg_chrdev_eptdev_destroy(struct device *dev, void *data) @@ -116,6 +119,18 @@ static int rpmsg_ept_cb(struct rpmsg_device *rpdev, void *buf, int len, return 0; } +static int rpmsg_ept_flow_cb(struct rpmsg_device *rpdev, void *priv, bool enable) +{ + struct rpmsg_eptdev *eptdev = priv; + + eptdev->remote_flow = enable; + eptdev->remote_flow_updated = true; + + 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); @@ -152,6 +167,7 @@ static int rpmsg_eptdev_open(struct inode *inode, struct file *filp) return -EINVAL; } + ept->flow_cb = rpmsg_ept_flow_cb; eptdev->ept = ept; filp->private_data = eptdev; mutex_unlock(&eptdev->ept_lock); @@ -172,6 +188,7 @@ static int rpmsg_eptdev_release(struct inode *inode, struct file *filp) eptdev->ept = NULL; } mutex_unlock(&eptdev->ept_lock); + eptdev->remote_flow_updated = false; /* Discard all SKBs */ skb_queue_purge(&eptdev->queue); @@ -285,6 +302,9 @@ static __poll_t rpmsg_eptdev_poll(struct file *filp, poll_table *wait) if (!skb_queue_empty(&eptdev->queue)) mask |= EPOLLIN | EPOLLRDNORM; + if (eptdev->remote_flow_updated) + mask |= EPOLLPRI; + mutex_lock(&eptdev->ept_lock); mask |= rpmsg_poll(eptdev->ept, filp, wait); mutex_unlock(&eptdev->ept_lock); @@ -297,14 +317,31 @@ static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd, { struct rpmsg_eptdev *eptdev = fp->private_data; - if (cmd != RPMSG_DESTROY_EPT_IOCTL) - return -EINVAL; + bool set; + int ret; - /* Don't allow to destroy a default endpoint. */ - if (eptdev->default_ept) - return -EINVAL; + switch (cmd) { + case RPMSG_GET_OUTGOING_FLOWCONTROL: + eptdev->remote_flow_updated = false; + ret = put_user(eptdev->remote_flow, (int __user *)arg); + break; + case RPMSG_SET_INCOMING_FLOWCONTROL: + set = !!arg; + ret = rpmsg_set_flow_control(eptdev->ept, set, eptdev->chinfo.dst); + break; + case RPMSG_DESTROY_EPT_IOCTL: + /* Don't allow to destroy a default endpoint. */ + if (eptdev->default_ept) { + ret = -EINVAL; + break; + } + ret = rpmsg_chrdev_eptdev_destroy(&eptdev->dev, NULL); + break; + default: + ret = -EINVAL; + } - return rpmsg_chrdev_eptdev_destroy(&eptdev->dev, NULL); + return ret; } static const struct file_operations rpmsg_eptdev_fops = { diff --git a/include/uapi/linux/rpmsg.h b/include/uapi/linux/rpmsg.h index 1637e68..c955e27 100644 --- a/include/uapi/linux/rpmsg.h +++ b/include/uapi/linux/rpmsg.h @@ -10,7 +10,6 @@ #include #define RPMSG_ADDR_ANY 0xFFFFFFFF - /** * struct rpmsg_endpoint_info - endpoint info representation * @name: name of service @@ -43,4 +42,14 @@ struct rpmsg_endpoint_info { */ #define RPMSG_RELEASE_DEV_IOCTL _IOW(0xb5, 0x4, struct rpmsg_endpoint_info) +/** + * Set the flow control for the remote rpmsg char device. + */ +#define RPMSG_GET_OUTGOING_FLOWCONTROL _IOW(0xb5, 0x5, struct rpmsg_endpoint_info) + +/** + * Set the flow control for the local rpmsg char device. + */ +#define RPMSG_SET_INCOMING_FLOWCONTROL _IOW(0xb5, 0x6, struct rpmsg_endpoint_info) + #endif