From patchwork Tue Jan 18 19:43:11 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deepak Kumar Singh X-Patchwork-Id: 12716838 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 3E622C4332F for ; Tue, 18 Jan 2022 19:43:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348892AbiARTnj (ORCPT ); Tue, 18 Jan 2022 14:43:39 -0500 Received: from alexa-out.qualcomm.com ([129.46.98.28]:48977 "EHLO alexa-out.qualcomm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348857AbiARTni (ORCPT ); Tue, 18 Jan 2022 14:43:38 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; i=@quicinc.com; q=dns/txt; s=qcdkim; t=1642535018; x=1674071018; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version; bh=TUQqOnkv/900KZUw+oFMuV11j7TdNX7txIgYkN3/bw0=; b=GjEuLwYA6kC5IEy2sPnpzzpsMzzKzphzHMzPLmxMHe+79SSbzP6HRQWy Xm7g7vmOjVPdm9p9UT59hfGvMkcdCqNpQwDjA8ucG1NyfVgW9BtgrAX1w CYqggWl9v9PuvA9Yf0NhF0+L4ROQmP2rexKG0qR/3yitLh/0eCeWai7FL E=; Received: from ironmsg-lv-alpha.qualcomm.com ([10.47.202.13]) by alexa-out.qualcomm.com with ESMTP; 18 Jan 2022 11:43:38 -0800 X-QCInternal: smtphost Received: from nasanex01c.na.qualcomm.com ([10.47.97.222]) by ironmsg-lv-alpha.qualcomm.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Jan 2022 11:43:37 -0800 Received: from nalasex01a.na.qualcomm.com (10.47.209.196) by nasanex01c.na.qualcomm.com (10.47.97.222) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.922.19; Tue, 18 Jan 2022 11:43:37 -0800 Received: from deesin-linux.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.922.19; Tue, 18 Jan 2022 11:43:34 -0800 From: Deepak Kumar Singh To: , , , CC: , , , Deepak Kumar Singh , Ohad Ben-Cohen Subject: [PATCH V2 1/3] rpmsg: core: Add signal API support Date: Wed, 19 Jan 2022 01:13:11 +0530 Message-ID: <1642534993-6552-2-git-send-email-quic_deesin@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1642534993-6552-1-git-send-email-quic_deesin@quicinc.com> References: <1642534993-6552-1-git-send-email-quic_deesin@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org Some transports like Glink support the state notifications between clients using signals similar to serial protocol signals. Local glink client drivers can send and receive signals to glink clients running on remote processors. Add APIs to support sending and receiving of signals by rpmsg clients. Signed-off-by: Deepak Kumar Singh --- drivers/rpmsg/rpmsg_core.c | 21 +++++++++++++++++++++ drivers/rpmsg/rpmsg_internal.h | 2 ++ include/linux/rpmsg.h | 14 ++++++++++++++ 3 files changed, 37 insertions(+) diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c index d3eb600..6712418 100644 --- a/drivers/rpmsg/rpmsg_core.c +++ b/drivers/rpmsg/rpmsg_core.c @@ -328,6 +328,24 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, EXPORT_SYMBOL(rpmsg_trysend_offchannel); /** + * rpmsg_set_flow_control() - sets/clears serial flow control signals + * @ept: the rpmsg endpoint + * @enable: enable or disable serial flow control + * + * Return: 0 on success and an appropriate error value on failure. + */ +int rpmsg_set_flow_control(struct rpmsg_endpoint *ept, bool enable) +{ + if (WARN_ON(!ept)) + return -EINVAL; + if (!ept->ops->set_flow_control) + return -ENXIO; + + return ept->ops->set_flow_control(ept, enable); +} +EXPORT_SYMBOL(rpmsg_set_flow_control); + +/** * rpmsg_get_mtu() - get maximum transmission buffer size for sending message. * @ept: the rpmsg endpoint * @@ -535,6 +553,9 @@ static int rpmsg_dev_probe(struct device *dev) rpdev->ept = ept; rpdev->src = ept->addr; + + if (rpdrv->signals) + ept->sig_cb = rpdrv->signals; } err = rpdrv->probe(rpdev); diff --git a/drivers/rpmsg/rpmsg_internal.h b/drivers/rpmsg/rpmsg_internal.h index b1245d3..35c2197 100644 --- a/drivers/rpmsg/rpmsg_internal.h +++ b/drivers/rpmsg/rpmsg_internal.h @@ -53,6 +53,7 @@ struct rpmsg_device_ops { * @trysendto: see @rpmsg_trysendto(), optional * @trysend_offchannel: see @rpmsg_trysend_offchannel(), optional * @poll: see @rpmsg_poll(), optional + * @set_flow_control: see @rpmsg_set_flow_control(), optional * @get_mtu: see @rpmsg_get_mtu(), optional * * Indirection table for the operations that a rpmsg backend should implement. @@ -73,6 +74,7 @@ struct rpmsg_endpoint_ops { void *data, int len); __poll_t (*poll)(struct rpmsg_endpoint *ept, struct file *filp, poll_table *wait); + int (*set_flow_control)(struct rpmsg_endpoint *ept, bool enable); ssize_t (*get_mtu)(struct rpmsg_endpoint *ept); }; diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h index 02fa911..06d090c 100644 --- a/include/linux/rpmsg.h +++ b/include/linux/rpmsg.h @@ -62,12 +62,14 @@ struct rpmsg_device { }; typedef int (*rpmsg_rx_cb_t)(struct rpmsg_device *, void *, int, void *, u32); +typedef int (*rpmsg_rx_sig_t)(struct rpmsg_device *, void *, u32); /** * struct rpmsg_endpoint - binds a local rpmsg address to its user * @rpdev: rpmsg channel device * @refcount: when this drops to zero, the ept is deallocated * @cb: rx callback handler + * @sig_cb: rx serial signal handler * @cb_lock: must be taken before accessing/changing @cb * @addr: local rpmsg address * @priv: private data for the driver's use @@ -90,6 +92,7 @@ struct rpmsg_endpoint { struct rpmsg_device *rpdev; struct kref refcount; rpmsg_rx_cb_t cb; + rpmsg_rx_sig_t sig_cb; struct mutex cb_lock; u32 addr; void *priv; @@ -111,6 +114,7 @@ struct rpmsg_driver { int (*probe)(struct rpmsg_device *dev); void (*remove)(struct rpmsg_device *dev); int (*callback)(struct rpmsg_device *, void *, int, void *, u32); + int (*signals)(struct rpmsg_device *rpdev, void *priv, u32); }; static inline u16 rpmsg16_to_cpu(struct rpmsg_device *rpdev, __rpmsg16 val) @@ -188,6 +192,8 @@ __poll_t rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp, ssize_t rpmsg_get_mtu(struct rpmsg_endpoint *ept); +int rpmsg_set_flow_control(struct rpmsg_endpoint *ept, bool enable); + #else static inline int rpmsg_register_device(struct rpmsg_device *rpdev) @@ -306,6 +312,14 @@ static inline ssize_t rpmsg_get_mtu(struct rpmsg_endpoint *ept) return -ENXIO; } +static inline int rpmsg_set_flow_control(struct rpmsg_endpoint *ept, bool enable) +{ + /* This shouldn't be possible */ + WARN_ON(1); + + return -ENXIO; +} + #endif /* IS_ENABLED(CONFIG_RPMSG) */ /* use a macro to avoid include chaining to get THIS_MODULE */ From patchwork Tue Jan 18 19:43:12 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deepak Kumar Singh X-Patchwork-Id: 12716839 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 189F2C433EF for ; Tue, 18 Jan 2022 19:43:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348922AbiARTnm (ORCPT ); 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Tue, 18 Jan 2022 11:43:41 -0800 Received: from deesin-linux.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.922.19; Tue, 18 Jan 2022 11:43:37 -0800 From: Deepak Kumar Singh To: , , , CC: , , , Deepak Kumar Singh , Andy Gross , Ohad Ben-Cohen Subject: [PATCH V2 2/3] rpmsg: glink: Add support to handle signals command Date: Wed, 19 Jan 2022 01:13:12 +0530 Message-ID: <1642534993-6552-3-git-send-email-quic_deesin@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1642534993-6552-1-git-send-email-quic_deesin@quicinc.com> References: <1642534993-6552-1-git-send-email-quic_deesin@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org Remote peripherals send signal notifications over glink with commandID 15. Add support to send and receive the signal command and convert the signals from NATIVE to TIOCM while receiving and vice versa while sending. Signed-off-by: Chris Lew Signed-off-by: Deepak Kumar Singh --- drivers/rpmsg/qcom_glink_native.c | 77 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c index 3f377a7..d673d65 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 @@ -205,9 +206,16 @@ 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 BIT(31) +#define NATIVE_CTS_SIG BIT(30) +#define NATIVE_CD_SIG BIT(29) +#define NATIVE_RI_SIG BIT(28) +#define SIG_MASK 0x0fff; + static void qcom_glink_rx_done_work(struct work_struct *work); static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink, @@ -1003,6 +1011,70 @@ 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; + + /** + * convert signals from TIOCM to NATIVE + * sigs = TIOCM_DTR|TIOCM_RTS + */ + if (enable) + sigs |= NATIVE_DTR_SIG | NATIVE_CTS_SIG; + else + sigs |= ~(NATIVE_DTR_SIG | NATIVE_CTS_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; + + 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.sig_cb) + return 0; + + /* convert signals from NATIVE to TIOCM */ + if (sigs & NATIVE_DTR_SIG) + sigs |= TIOCM_DSR; + if (sigs & NATIVE_CTS_SIG) + sigs |= TIOCM_CTS; + if (sigs & NATIVE_CD_SIG) + sigs |= TIOCM_CD; + if (sigs & NATIVE_RI_SIG) + sigs |= TIOCM_RI; + sigs &= SIG_MASK; + + channel->ept.sig_cb(channel->ept.rpdev, channel->ept.priv, sigs); + + return 0; +} + static irqreturn_t qcom_glink_native_intr(int irq, void *data) { struct qcom_glink *glink = data; @@ -1067,6 +1139,10 @@ 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; @@ -1442,6 +1518,7 @@ 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 Jan 18 19:43:13 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deepak Kumar Singh X-Patchwork-Id: 12716840 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 93BEDC433EF for ; Tue, 18 Jan 2022 19:44:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348970AbiARTor (ORCPT ); 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Tue, 18 Jan 2022 11:43:44 -0800 Received: from deesin-linux.qualcomm.com (10.80.80.8) by nalasex01a.na.qualcomm.com (10.47.209.196) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.922.19; Tue, 18 Jan 2022 11:43:41 -0800 From: Deepak Kumar Singh To: , , , CC: , , , Deepak Kumar Singh , Ohad Ben-Cohen Subject: [PATCH V2 3/3] rpmsg: char: Add TIOCMGET/TIOCMSET ioctl support Date: Wed, 19 Jan 2022 01:13:13 +0530 Message-ID: <1642534993-6552-4-git-send-email-quic_deesin@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1642534993-6552-1-git-send-email-quic_deesin@quicinc.com> References: <1642534993-6552-1-git-send-email-quic_deesin@quicinc.com> MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01b.na.qualcomm.com (10.46.141.250) To nalasex01a.na.qualcomm.com (10.47.209.196) Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@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 --- drivers/rpmsg/rpmsg_char.c | 47 ++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 43 insertions(+), 4 deletions(-) diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c index b5907b8..c03a118 100644 --- a/drivers/rpmsg/rpmsg_char.c +++ b/drivers/rpmsg/rpmsg_char.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include @@ -74,6 +75,9 @@ struct rpmsg_eptdev { spinlock_t queue_lock; struct sk_buff_head queue; wait_queue_head_t readq; + + u32 rsigs; + bool sig_pending; }; static int rpmsg_eptdev_destroy(struct device *dev, void *data) @@ -112,7 +116,18 @@ 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_sigs_cb(struct rpmsg_device *rpdev, void *priv, u32 sigs) +{ + struct rpmsg_eptdev *eptdev = priv; + + eptdev->rsigs = sigs; + eptdev->sig_pending = true; + wake_up_interruptible(&eptdev->readq); return 0; @@ -137,6 +152,7 @@ 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; @@ -155,6 +171,7 @@ 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); @@ -265,6 +282,9 @@ 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; @@ -274,11 +294,30 @@ static long rpmsg_eptdev_ioctl(struct file *fp, unsigned int cmd, unsigned long arg) { struct rpmsg_eptdev *eptdev = fp->private_data; + bool set; + u32 val; + int ret; - if (cmd != RPMSG_DESTROY_EPT_IOCTL) - return -EINVAL; + switch (cmd) { + case TIOCMGET: + eptdev->sig_pending = false; + ret = put_user(eptdev->rsigs, (int __user *)arg); + break; + case TIOCMSET: + ret = get_user(val, (int __user *)arg); + if (ret) + break; + set = (val & TIOCM_DTR) ? true : false; + ret = rpmsg_set_flow_control(eptdev->ept, set); + break; + case RPMSG_DESTROY_EPT_IOCTL: + ret = rpmsg_eptdev_destroy(&eptdev->dev, NULL); + break; + default: + ret = -EINVAL; + } - return rpmsg_eptdev_destroy(&eptdev->dev, NULL); + return ret; } static const struct file_operations rpmsg_eptdev_fops = {