From patchwork Fri Jun 26 14:46:56 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: 11627715 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 A67D1913 for ; Fri, 26 Jun 2020 14:47:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 83B5A207E8 for ; Fri, 26 Jun 2020 14:47:39 +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="AsyCZP+/" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729389AbgFZOrV (ORCPT ); Fri, 26 Jun 2020 10:47:21 -0400 Received: from m43-7.mailgun.net ([69.72.43.7]:34941 "EHLO m43-7.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729367AbgFZOrU (ORCPT ); Fri, 26 Jun 2020 10:47:20 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1593182839; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=4TQpm94FFnC9T8iU8dgGUImT9296mkfIJH93h01Kalo=; b=AsyCZP+/ATD3rUn11lzyPE6gCwKrKo0YGslh/FdEMqOpFW3Hia65QAW0NKdQLrD8zX0nlU6y spY92YmmY2PiEZebsoTYlsrTkNBXjBmoiEsHO+Iy7tCIDcHSPbf6RlXOjm4wW0FupXindh2+ QPlEGFOPXb5wIoSnpVS19Dhp2Q8= X-Mailgun-Sending-Ip: 69.72.43.7 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-west-2.postgun.com with SMTP id 5ef60a736f2ee827da19dea5 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Fri, 26 Jun 2020 14:47:15 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id CD397C4339C; Fri, 26 Jun 2020 14:47:14 +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 autolearn=unavailable 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 0104FC433C8; Fri, 26 Jun 2020 14:47:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 0104FC433C8 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, Deepak Kumar Singh Subject: [PATCH V6 1/4] rpmsg: core: Add signal API support Date: Fri, 26 Jun 2020 20:16:56 +0530 Message-Id: <1593182819-30747-2-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 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: Chris Lew Signed-off-by: Deepak Kumar Singh Signed-off-by: Arun Kumar Neelakantam --- drivers/rpmsg/rpmsg_core.c | 40 ++++++++++++++++++++++++++++++++++++++++ drivers/rpmsg/rpmsg_internal.h | 5 +++++ include/linux/rpmsg.h | 27 +++++++++++++++++++++++++++ 3 files changed, 72 insertions(+) diff --git a/drivers/rpmsg/rpmsg_core.c b/drivers/rpmsg/rpmsg_core.c index 91de940..e6eb5a1 100644 --- a/drivers/rpmsg/rpmsg_core.c +++ b/drivers/rpmsg/rpmsg_core.c @@ -283,6 +283,42 @@ int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, } EXPORT_SYMBOL(rpmsg_trysend_offchannel); +/** + * rpmsg_get_signals() - get the signals for this endpoint + * @ept: the rpmsg endpoint + * + * Returns signal bits on success and an appropriate error value on failure. + */ +int rpmsg_get_signals(struct rpmsg_endpoint *ept) +{ + if (WARN_ON(!ept)) + return -EINVAL; + if (!ept->ops->get_signals) + return -ENXIO; + + return ept->ops->get_signals(ept); +} +EXPORT_SYMBOL(rpmsg_get_signals); + +/** + * rpmsg_set_signals() - set the remote signals for this endpoint + * @ept: the rpmsg endpoint + * @set: set mask for signals + * @clear: clear mask for signals + * + * Returns 0 on success and an appropriate error value on failure. + */ +int rpmsg_set_signals(struct rpmsg_endpoint *ept, u32 set, u32 clear) +{ + if (WARN_ON(!ept)) + return -EINVAL; + if (!ept->ops->set_signals) + return -ENXIO; + + return ept->ops->set_signals(ept, set, clear); +} +EXPORT_SYMBOL(rpmsg_set_signals); + /* * match a rpmsg channel with a channel info struct. * this is used to make sure we're not creating rpmsg devices for channels @@ -468,6 +504,10 @@ 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 3fc83cd..8958d6c 100644 --- a/drivers/rpmsg/rpmsg_internal.h +++ b/drivers/rpmsg/rpmsg_internal.h @@ -2,6 +2,7 @@ /* * remote processor messaging bus internals * + * Copyright (c) 2018, The Linux Foundation. * Copyright (C) 2011 Texas Instruments, Inc. * Copyright (C) 2011 Google, Inc. * @@ -47,6 +48,8 @@ struct rpmsg_device_ops { * @trysendto: see @rpmsg_trysendto(), optional * @trysend_offchannel: see @rpmsg_trysend_offchannel(), optional * @poll: see @rpmsg_poll(), optional + * @get_signals: see @rpmsg_get_signals(), optional + * @set_signals: see @rpmsg_set_signals(), 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 @@ -66,6 +69,8 @@ struct rpmsg_endpoint_ops { void *data, int len); __poll_t (*poll)(struct rpmsg_endpoint *ept, struct file *filp, poll_table *wait); + int (*get_signals)(struct rpmsg_endpoint *ept); + int (*set_signals)(struct rpmsg_endpoint *ept, u32 set, u32 clear); }; int rpmsg_register_device(struct rpmsg_device *rpdev); diff --git a/include/linux/rpmsg.h b/include/linux/rpmsg.h index 9fe156d..c4dbb47 100644 --- a/include/linux/rpmsg.h +++ b/include/linux/rpmsg.h @@ -2,6 +2,7 @@ /* * Remote processor messaging * + * Copyright (c) 2018 The Linux Foundation. * Copyright (C) 2011 Texas Instruments, Inc. * Copyright (C) 2011 Google, Inc. * All rights reserved. @@ -60,6 +61,7 @@ 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, u32); /** * struct rpmsg_endpoint - binds a local rpmsg address to its user @@ -67,6 +69,7 @@ typedef int (*rpmsg_rx_cb_t)(struct rpmsg_device *, void *, int, void *, u32); * @refcount: when this drops to zero, the ept is deallocated * @cb: rx callback handler * @cb_lock: must be taken before accessing/changing @cb + * @sig_cb: rx serial signal handler * @addr: local rpmsg address * @priv: private data for the driver's use * @@ -89,6 +92,7 @@ struct rpmsg_endpoint { struct kref refcount; rpmsg_rx_cb_t cb; struct mutex cb_lock; + rpmsg_rx_sig_t sig_cb; u32 addr; void *priv; @@ -102,6 +106,7 @@ 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; @@ -109,6 +114,8 @@ 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 old, u32 new); }; #if IS_ENABLED(CONFIG_RPMSG) @@ -135,6 +142,9 @@ 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_get_signals(struct rpmsg_endpoint *ept); +int rpmsg_set_signals(struct rpmsg_endpoint *ept, u32 set, u32 clear); + #else static inline int register_rpmsg_device(struct rpmsg_device *dev) @@ -242,6 +252,23 @@ static inline __poll_t rpmsg_poll(struct rpmsg_endpoint *ept, return 0; } +static inline int rpmsg_get_signals(struct rpmsg_endpoint *ept) +{ + /* This shouldn't be possible */ + WARN_ON(1); + + return -ENXIO; +} + +static inline int rpmsg_set_signals(struct rpmsg_endpoint *ept, + u32 set, u32 clear) +{ + /* 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 */