From patchwork Thu Sep 30 15:32:01 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deepak Kumar Singh X-Patchwork-Id: 12528717 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7B09DC433F5 for ; Thu, 30 Sep 2021 15:32:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 66C3061A0D for ; Thu, 30 Sep 2021 15:32:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344460AbhI3Pea (ORCPT ); Thu, 30 Sep 2021 11:34:30 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:44131 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344335AbhI3PeX (ORCPT ); Thu, 30 Sep 2021 11:34:23 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1633015961; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=8zvHFNgrPUQ8mrLvzWiR4N0vGvZlBku4VpbJaiTTNMU=; b=oahVYmCDLgV1r9NyY6IQuwUJbJSILbKqVRtHcUC9SBiruiPJQ+pBrVvL9XGKkFuKlI4WOX78 zLhxAAcpfe/0m3LUu729HUx0majXpdeCBGWoZmY8asdq6o9jbvI/3XfrsbLodfm95tDjd3rA lCe5HkPQuKWD2uwkm8v1yvE8AN4= X-Mailgun-Sending-Ip: 69.72.43.7 X-Mailgun-Sid: WyI4ZWZiZiIsICJsaW51eC1yZW1vdGVwcm9jQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n05.prod.us-west-2.postgun.com with SMTP id 6155d88ca5a9bab6e8623014 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Thu, 30 Sep 2021 15:32:28 GMT Sender: deesin=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 754D6C4360D; Thu, 30 Sep 2021 15:32:28 +0000 (UTC) Received: from deesin-linux.qualcomm.com (unknown [202.46.22.19]) (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 1BC09C43618; Thu, 30 Sep 2021 15:32:23 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 smtp.codeaurora.org 1BC09C43618 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=fail smtp.mailfrom=codeaurora.org From: Deepak Kumar Singh To: bjorn.andersson@linaro.org, swboyd@chromium.org, clew@codeaurora.org, mathieu.poirier@linaro.org Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, Deepak Kumar Singh , Ohad Ben-Cohen Subject: [PATCH V1 1/3] rpmsg: core: Add signal API support Date: Thu, 30 Sep 2021 21:02:01 +0530 Message-Id: <1633015924-881-2-git-send-email-deesin@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1633015924-881-1-git-send-email-deesin@codeaurora.org> References: <1633015924-881-1-git-send-email-deesin@codeaurora.org> 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 Reported-by: kernel test robot Reported-by: kernel test robot --- drivers/rpmsg/rpmsg_core.c | 21 +++++++++++++++++++++ drivers/rpmsg/rpmsg_internal.h | 2 ++ include/linux/rpmsg.h | 15 +++++++++++++++ 3 files changed, 38 insertions(+) diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c index 9151836..5cae50c 100644 --- a/drivers/rpmsg/rpmsg_core.c +++ b/drivers/rpmsg/rpmsg_core.c @@ -327,6 +327,24 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, } EXPORT_SYMBOL(rpmsg_trysend_offchannel); +/** + * rpmsg_set_flow_control() - sets/clears searial flow control signals + * @ept: the rpmsg endpoint + * @enable: enable or disable serial flow control + * + * Returns 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); + /* * match a rpmsg channel with a channel info struct. * this is used to make sure we're not creating rpmsg devices for channels @@ -514,6 +532,9 @@ 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 a76c344..dcb2ec1 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 * * Indirection table for the operations that a rpmsg backend should implement. * In addition to @destroy_ept, the backend must at least implement @send and @@ -72,6 +73,7 @@ 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); }; struct device *rpmsg_find_device(struct device *parent, diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h index d97dcd0..b805c70 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; @@ -104,6 +107,7 @@ struct rpmsg_endpoint { * @probe: invoked when a matching rpmsg channel (i.e. device) is found * @remove: invoked when the rpmsg channel is removed * @callback: invoked when an inbound message is received on the channel + * @signals: invoked when a serial signal change is received on the channel */ struct rpmsg_driver { struct device_driver drv; @@ -111,6 +115,7 @@ 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) @@ -186,6 +191,8 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, __poll_t rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp, poll_table *wait); +int rpmsg_set_flow_control(struct rpmsg_endpoint *ept, bool enable); + #else static inline int rpmsg_register_device(struct rpmsg_device *rpdev) @@ -296,6 +303,14 @@ static inline __poll_t rpmsg_poll(struct rpmsg_endpoint *ept, return 0; } +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 Thu Sep 30 15:32:03 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deepak Kumar Singh X-Patchwork-Id: 12528723 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E6692C433F5 for ; Thu, 30 Sep 2021 15:32:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D0BB4619EE for ; 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Thu, 30 Sep 2021 15:32:37 GMT Sender: deesin=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 761D4C43617; Thu, 30 Sep 2021 15:32:37 +0000 (UTC) Received: from deesin-linux.qualcomm.com (unknown [202.46.22.19]) (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 9B382C4360D; Thu, 30 Sep 2021 15:32:32 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 smtp.codeaurora.org 9B382C4360D 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=fail smtp.mailfrom=codeaurora.org From: Deepak Kumar Singh To: bjorn.andersson@linaro.org, swboyd@chromium.org, clew@codeaurora.org, mathieu.poirier@linaro.org Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, Deepak Kumar Singh , Andy Gross , Ohad Ben-Cohen Subject: [PATCH V1 2/3] rpmsg: glink: Add support to handle signals command Date: Thu, 30 Sep 2021 21:02:03 +0530 Message-Id: <1633015924-881-4-git-send-email-deesin@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1633015924-881-1-git-send-email-deesin@codeaurora.org> References: <1633015924-881-1-git-send-email-deesin@codeaurora.org> 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 | 75 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c index 05533c7..384fcd2 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 @@ -201,9 +202,16 @@ 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) + + static void qcom_glink_rx_done_work(struct work_struct *work); static struct glink_channel *qcom_glink_alloc_channel(struct qcom_glink *glink, @@ -976,6 +984,68 @@ 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; + + /** + * 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; + } + + /* 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 &= 0x0fff; + + if (channel->ept.sig_cb) + 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; @@ -1037,6 +1107,10 @@ 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; @@ -1382,6 +1456,7 @@ 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 Thu Sep 30 15:32:04 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Deepak Kumar Singh X-Patchwork-Id: 12528721 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 85A13C433F5 for ; Thu, 30 Sep 2021 15:32:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6EE67619F7 for ; 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Thu, 30 Sep 2021 15:32:42 GMT Sender: deesin=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 6EEC0C4361A; Thu, 30 Sep 2021 15:32:42 +0000 (UTC) Received: from deesin-linux.qualcomm.com (unknown [202.46.22.19]) (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 8D897C43619; Thu, 30 Sep 2021 15:32:37 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 smtp.codeaurora.org 8D897C43619 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=fail smtp.mailfrom=codeaurora.org From: Deepak Kumar Singh To: bjorn.andersson@linaro.org, swboyd@chromium.org, clew@codeaurora.org, mathieu.poirier@linaro.org Cc: linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-remoteproc@vger.kernel.org, Deepak Kumar Singh , Ohad Ben-Cohen Subject: [PATCH V1 3/3] rpmsg: char: Add TIOCMGET/TIOCMSET ioctl support Date: Thu, 30 Sep 2021 21:02:04 +0530 Message-Id: <1633015924-881-5-git-send-email-deesin@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1633015924-881-1-git-send-email-deesin@codeaurora.org> References: <1633015924-881-1-git-send-email-deesin@codeaurora.org> 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 | 43 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 43 insertions(+) diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c index 2bebc9b..60a889b 100644 --- a/drivers/rpmsg/rpmsg_char.c +++ b/drivers/rpmsg/rpmsg_char.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include @@ -76,6 +77,9 @@ 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) @@ -120,6 +124,18 @@ 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 sigs) +{ + struct rpmsg_eptdev *eptdev = priv; + + eptdev->rsigs = sigs; + 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); @@ -139,6 +155,7 @@ 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; @@ -157,6 +174,7 @@ 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); @@ -267,6 +285,9 @@ 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; @@ -276,10 +297,32 @@ 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); }