From patchwork Tue Feb 21 14:35:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sarannya S X-Patchwork-Id: 13148002 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 54F01C6379F for ; Tue, 21 Feb 2023 14:37:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234489AbjBUOhd (ORCPT ); Tue, 21 Feb 2023 09:37:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58092 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234488AbjBUOhc (ORCPT ); Tue, 21 Feb 2023 09:37:32 -0500 Received: from mx0a-0031df01.pphosted.com (mx0a-0031df01.pphosted.com [205.220.168.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BA4E92005F; Tue, 21 Feb 2023 06:37:29 -0800 (PST) Received: from pps.filterd (m0279862.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 31LCcN00028674; Tue, 21 Feb 2023 14:37:22 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=HI9u2GFU8htEiR6UUb2OPsnPLZvoUE7rjEHPYn4ZC0s=; b=Isd/ER9fqS64da66mc1+1b4GLcz8LJB4o4qPFHxDjcxFVUUQhRwhQbeZZWjEp3n/P5Kh vyz8Gdf1p3Yb8g1cqdMqskpV1aSZHJkhZzju/zEMpbaYD9p90xTUYfRK2svw1t4VyEEA 3rI3JRQz72KF7cDCZTFee8qWwqbxpi+FCL1/E8KaEtP3gX5WGFD3f3iSCD7UcNwh+htt +NDOmon2HI2SusRIuw9Cu/jzdfJoc1PXRkA/zno8acNLCaMthbBA4V9I4o7URNEE27jS exgPNfNZ6hSFRAEYE/gXh1k9bj+xcmv2Z9rIoxYZHtd5z6ecET0H7MkuL+wraL5P8if9 9w== Received: from nalasppmta01.qualcomm.com (Global_NAT1.qualcomm.com [129.46.96.20]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3nvp4v1at6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 21 Feb 2023 14:37:22 +0000 Received: from nalasex01b.na.qualcomm.com (nalasex01b.na.qualcomm.com [10.47.209.197]) by NALASPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTPS id 31LEbLrX023046 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 21 Feb 2023 14:37:21 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 15.2.986.41; Tue, 21 Feb 2023 06:37:17 -0800 From: Sarannya S To: , , , , CC: , , , Sarannya S , Deepak Kumar Singh , Andy Gross , Bjorn Andersson , Konrad Dybcio Subject: [PATCH V5 2/3] rpmsg: glink: Add support to handle signals command Date: Tue, 21 Feb 2023 20:05:13 +0530 Message-ID: <1676990114-1369-3-git-send-email-quic_sarannya@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1676990114-1369-1-git-send-email-quic_sarannya@quicinc.com> References: <1676990114-1369-1-git-send-email-quic_sarannya@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) 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-ORIG-GUID: AjnA6COqqEPoLbcQtWbdyl8izhU57giI X-Proofpoint-GUID: AjnA6COqqEPoLbcQtWbdyl8izhU57giI X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.170.22 definitions=2023-02-21_08,2023-02-20_02,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 mlxlogscore=999 clxscore=1011 adultscore=0 spamscore=0 phishscore=0 suspectscore=0 bulkscore=0 impostorscore=0 lowpriorityscore=0 malwarescore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302210122 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Remote peripherals send signal notifications over glink with commandID 15. Add support to send and receive the signal command and based signals enable or disable flow control with remote host. Signed-off-by: Chris Lew Signed-off-by: Deepak Kumar Singh Signed-off-by: Sarannya S --- drivers/rpmsg/qcom_glink_native.c | 63 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c index 115c0a1..01d0a49 100644 --- a/drivers/rpmsg/qcom_glink_native.c +++ b/drivers/rpmsg/qcom_glink_native.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include @@ -203,9 +204,15 @@ static const struct rpmsg_endpoint_ops glink_endpoint_ops; #define RPM_CMD_TX_DATA_CONT 12 #define RPM_CMD_READ_NOTIF 13 #define RPM_CMD_RX_DONE_W_REUSE 14 +#define RPM_CMD_SIGNALS 15 #define GLINK_FEATURE_INTENTLESS BIT(1) +#define NATIVE_DTR_SIG NATIVE_DSR_SIG +#define NATIVE_DSR_SIG BIT(31) +#define NATIVE_RTS_SIG NATIVE_CTS_SIG +#define NATIVE_CTS_SIG BIT(30) + static void qcom_glink_rx_done_work(struct work_struct *work); static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink, @@ -1001,6 +1008,57 @@ static int qcom_glink_rx_open_ack(struct qcom_glink *glink, unsigned int lcid) return 0; } +/** + * qcom_glink_set_flow_control() - convert a signal cmd to wire format and + * transmit + * @ept: Rpmsg endpoint for channel. + * @enable: True/False - enable or disable flow control + * + * Return: 0 on success or standard Linux error code. + */ +static int qcom_glink_set_flow_control(struct rpmsg_endpoint *ept, bool enable) +{ + struct glink_channel *channel = to_glink_channel(ept); + struct qcom_glink *glink = channel->glink; + struct glink_msg msg; + u32 sigs = 0; + + if (enable) + sigs |= NATIVE_DTR_SIG | NATIVE_RTS_SIG; + + msg.cmd = cpu_to_le16(RPM_CMD_SIGNALS); + msg.param1 = cpu_to_le16(channel->lcid); + msg.param2 = cpu_to_le32(sigs); + + return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); +} + +static int qcom_glink_handle_signals(struct qcom_glink *glink, + unsigned int rcid, unsigned int sigs) +{ + struct glink_channel *channel; + unsigned long flags; + bool enable = false; + + spin_lock_irqsave(&glink->idr_lock, flags); + channel = idr_find(&glink->rcids, rcid); + spin_unlock_irqrestore(&glink->idr_lock, flags); + if (!channel) { + dev_err(glink->dev, "signal for non-existing channel\n"); + return -EINVAL; + } + + if (!channel->ept.flow_cb) + return 0; + + if (sigs & (NATIVE_DSR_SIG | NATIVE_CTS_SIG)) + enable = true; + + channel->ept.flow_cb(channel->ept.rpdev, channel->ept.priv, enable); + + return 0; +} + static irqreturn_t qcom_glink_native_intr(int irq, void *data) { struct qcom_glink *glink = data; @@ -1065,6 +1123,10 @@ static irqreturn_t qcom_glink_native_intr(int irq, void *data) qcom_glink_handle_intent_req_ack(glink, param1, param2); qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); break; + case RPM_CMD_SIGNALS: + qcom_glink_handle_signals(glink, param1, param2); + qcom_glink_rx_advance(glink, ALIGN(sizeof(msg), 8)); + break; default: dev_err(glink->dev, "unhandled rx cmd: %d\n", cmd); ret = -EINVAL; @@ -1440,6 +1502,7 @@ static const struct rpmsg_endpoint_ops glink_endpoint_ops = { .sendto = qcom_glink_sendto, .trysend = qcom_glink_trysend, .trysendto = qcom_glink_trysendto, + .set_flow_control = qcom_glink_set_flow_control, }; static void qcom_glink_rpdev_release(struct device *dev) From patchwork Tue Feb 21 14:35:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sarannya S X-Patchwork-Id: 13148003 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 2EA99C6379F for ; Tue, 21 Feb 2023 14:37:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234488AbjBUOhs (ORCPT ); Tue, 21 Feb 2023 09:37:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58424 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234497AbjBUOhr (ORCPT ); Tue, 21 Feb 2023 09:37:47 -0500 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 45AD72A9BB; 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Tue, 21 Feb 2023 14:37:37 +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 31LEbapX024650 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 21 Feb 2023 14:37:36 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 15.2.986.41; Tue, 21 Feb 2023 06:37:32 -0800 From: Sarannya S To: , , , , CC: , , , Sarannya S , Deepak Kumar Singh , Bjorn Andersson Subject: [PATCH V5 3/3] rpmsg: char: Add TIOCMGET/TIOCMSET ioctl support Date: Tue, 21 Feb 2023 20:05:14 +0530 Message-ID: <1676990114-1369-4-git-send-email-quic_sarannya@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1676990114-1369-1-git-send-email-quic_sarannya@quicinc.com> References: <1676990114-1369-1-git-send-email-quic_sarannya@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) 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-ORIG-GUID: hJWid7dGT5aa8Y7YoMazUmh3cA6d6V_Y X-Proofpoint-GUID: hJWid7dGT5aa8Y7YoMazUmh3cA6d6V_Y X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.930,Hydra:6.0.562,FMLib:17.11.170.22 definitions=2023-02-21_08,2023-02-20_02,2023-02-09_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 priorityscore=1501 lowpriorityscore=0 adultscore=0 clxscore=1015 malwarescore=0 mlxlogscore=931 mlxscore=0 impostorscore=0 phishscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2212070000 definitions=main-2302210122 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Add TICOMGET and TIOCMSET 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 | 60 +++++++++++++++++++++++++++++++++++++++------- include/uapi/linux/rpmsg.h | 11 +++++++++ 2 files changed, 63 insertions(+), 8 deletions(-) diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c index 3e0b8f3..fdcb4ff 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; + u32 remote_signals; + bool flow_control; }; int rpmsg_chrdev_eptdev_destroy(struct device *dev, void *data) @@ -109,7 +112,22 @@ static int rpmsg_ept_cb(struct rpmsg_device *rpdev, void *buf, int len, skb_queue_tail(&eptdev->queue, skb); spin_unlock(&eptdev->queue_lock); - /* wake up any blocking processes, waiting for new data */ + wake_up_interruptible(&eptdev->readq); + + return 0; +} + +static int rpmsg_ept_flow_cb(struct rpmsg_device *rpdev, void *priv, bool enable) +{ + struct rpmsg_eptdev *eptdev = priv; + + if (enable) + eptdev->remote_signals = RPMSG_FLOW_CONTROL_ON; + else + eptdev->remote_signals = 0; + + eptdev->flow_control = true; + wake_up_interruptible(&eptdev->readq); return 0; @@ -146,6 +164,7 @@ 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); @@ -166,6 +185,7 @@ static int rpmsg_eptdev_release(struct inode *inode, struct file *filp) eptdev->ept = NULL; } mutex_unlock(&eptdev->ept_lock); + eptdev->flow_control = false; /* Discard all SKBs */ skb_queue_purge(&eptdev->queue); @@ -279,6 +299,9 @@ static __poll_t rpmsg_eptdev_poll(struct file *filp, poll_table *wait) if (!skb_queue_empty(&eptdev->queue)) mask |= EPOLLIN | EPOLLRDNORM; + if (eptdev->flow_control) + mask |= EPOLLPRI; + mask |= rpmsg_poll(eptdev->ept, filp, wait); return mask; @@ -289,14 +312,35 @@ 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; - - /* Don't allow to destroy a default endpoint. */ - if (eptdev->default_ept) - return -EINVAL; + bool set; + u32 val; + int ret; + + switch (cmd) { + case RPMSG_GET_SIGNAL_IOCTL: + eptdev->flow_control = false; + ret = put_user(eptdev->remote_signals, (int __user *)arg); + break; + case RPMSG_SET_SIGNAL_IOCTL: + ret = get_user(val, (int __user *)arg); + if (ret) + break; + set = (val & RPMSG_FLOW_CONTROL_ON) ? true : false; + ret = rpmsg_set_flow_control(eptdev->ept, set); + 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..e9aa6b9 100644 --- a/include/uapi/linux/rpmsg.h +++ b/include/uapi/linux/rpmsg.h @@ -10,6 +10,7 @@ #include #define RPMSG_ADDR_ANY 0xFFFFFFFF +#define RPMSG_FLOW_CONTROL_ON 0x001 /** * struct rpmsg_endpoint_info - endpoint info representation @@ -43,4 +44,14 @@ struct rpmsg_endpoint_info { */ #define RPMSG_RELEASE_DEV_IOCTL _IOW(0xb5, 0x4, struct rpmsg_endpoint_info) +/** + * Get the remote rpmsg char device's flow control signal. + */ +#define RPMSG_GET_SIGNAL_IOCTL _IOW(0xb5, 0x5, struct rpmsg_endpoint_info) + +/** + * Set the flow control for the local rpmsg char device. + */ +#define RPMSG_SET_SIGNAL_IOCTL _IOW(0xb5, 0x6, struct rpmsg_endpoint_info) + #endif