From patchwork Wed May 6 04:50:14 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 189271 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0CFA8C4725B for ; Wed, 6 May 2020 04:50:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DAA0C206F9 for ; Wed, 6 May 2020 04:50:47 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="G/KtkBuK" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726751AbgEFEuq (ORCPT ); Wed, 6 May 2020 00:50:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44450 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725824AbgEFEup (ORCPT ); Wed, 6 May 2020 00:50:45 -0400 Received: from mail-pj1-x1043.google.com (mail-pj1-x1043.google.com [IPv6:2607:f8b0:4864:20::1043]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 69291C061A0F for ; Tue, 5 May 2020 21:50:44 -0700 (PDT) Received: by mail-pj1-x1043.google.com with SMTP id a32so269771pje.5 for ; Tue, 05 May 2020 21:50:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id; bh=xeD4fhXXLKw695JxM+Psz6fMHOU1+fBrBm0clKJ80mY=; b=G/KtkBuKiEjsfoatkD/ZeVYejX0UZTvibW3Zcw5Jvdo/xcB7IV2KiYHlCfb18ZrWLE 6Xgkg/e0KdUbtyAisRfZFduyr8HIfztgL+jjlYM0dRj/pc+w8q0JE0VAhseEiNgS1zUQ dYwl0G2JZKeEkaSPKv1oiCnESeKvobB/d/Z37Sa+FLMhhRawK30hhA96LeIE4n8CYFwX qwGg4DIvR6wgr0RV3CUqRC59idX5t6vO9wcdVW0NejyBxNQ6JMYRWtvh4J08l5qIFAmG 1tM/BW6R/YSnCZXj5SUNXK6nRa1nHkxGxk5IAqB6zP//dLTfRAOk6Efo9TP8mTiaAxHp A8RA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=xeD4fhXXLKw695JxM+Psz6fMHOU1+fBrBm0clKJ80mY=; b=eACUYcBgZi2Tl5FTOxVgVsePamgy/ZjZJbKTeQvyYl1PPsAFxuHTHBKiqEcd7QlzGV uqQaWQlX3Oji6QXtyRSV+dLGfLJ493VMhmqQr05yVpgdKSREBpSDfwyw0gtm8CwPZ0KN CIyLtncb2AZau18PtoqBLBTow0hclMw9mIFlMQRQCitmTy5kojFgQ5d1z3oZurjraBCG nsGk0IK2Qa9RCKFK0natRrv3eUAGkxPEumUyAm7vo3XLpADvc7HmTITzTVfplOPyTgAQ 1Ps/MLZ5eKQ4rCpVBa+DZCDrJt4HzpO3Zvq4RUQfZF3F2xzlqmrp7XblbjM87/7fythf UCdg== X-Gm-Message-State: AGi0Puamsk2g5e7ptpavQipVFxYTCtdmP9YCcE+g9FaklGYIwQy/dgjc HoroO/D+v+IGYsjKwAO8vwim X-Google-Smtp-Source: APiQypItLRlwJgfdazvZv/g+NPME6wtexg28p0c+2zudmwz7W9rjo94AVwGAnad/TY2AGuOXzAEJJQ== X-Received: by 2002:a17:90a:23ad:: with SMTP id g42mr6809422pje.35.1588740643613; Tue, 05 May 2020 21:50:43 -0700 (PDT) Received: from localhost.localdomain ([2409:4072:6e88:ac9a:a18c:3139:9aa9:bb73]) by smtp.gmail.com with ESMTPSA id n69sm3491840pjc.8.2020.05.05.21.50.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 May 2020 21:50:42 -0700 (PDT) From: Manivannan Sadhasivam To: davem@davemloft.net Cc: kvalo@codeaurora.org, bjorn.andersson@linaro.org, hemantk@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, clew@codeaurora.org, gregkh@linuxfoundation.org, netdev@vger.kernel.org, Manivannan Sadhasivam Subject: [PATCH 1/2] net: qrtr: Add MHI transport layer Date: Wed, 6 May 2020 10:20:14 +0530 Message-Id: <20200506045015.13421-1-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.17.1 Sender: linux-arm-msm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org MHI is the transport layer used for communicating to the external modems. Hence, this commit adds MHI transport layer support to QRTR for transferring the QMI messages over IPC Router. Reviewed-by: Bjorn Andersson Signed-off-by: Manivannan Sadhasivam --- net/qrtr/Kconfig | 7 +++ net/qrtr/Makefile | 2 + net/qrtr/mhi.c | 127 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 136 insertions(+) create mode 100644 net/qrtr/mhi.c diff --git a/net/qrtr/Kconfig b/net/qrtr/Kconfig index 63f89cc6e82c..8eb876471564 100644 --- a/net/qrtr/Kconfig +++ b/net/qrtr/Kconfig @@ -29,4 +29,11 @@ config QRTR_TUN implement endpoints of QRTR, for purpose of tunneling data to other hosts or testing purposes. +config QRTR_MHI + tristate "MHI IPC Router channels" + depends on MHI_BUS + help + Say Y here to support MHI based ipcrouter channels. MHI is the + transport used for communicating to external modems. + endif # QRTR diff --git a/net/qrtr/Makefile b/net/qrtr/Makefile index 32d4e923925d..1b1411d158a7 100644 --- a/net/qrtr/Makefile +++ b/net/qrtr/Makefile @@ -5,3 +5,5 @@ obj-$(CONFIG_QRTR_SMD) += qrtr-smd.o qrtr-smd-y := smd.o obj-$(CONFIG_QRTR_TUN) += qrtr-tun.o qrtr-tun-y := tun.o +obj-$(CONFIG_QRTR_MHI) += qrtr-mhi.o +qrtr-mhi-y := mhi.o diff --git a/net/qrtr/mhi.c b/net/qrtr/mhi.c new file mode 100644 index 000000000000..2a2abf5b070d --- /dev/null +++ b/net/qrtr/mhi.c @@ -0,0 +1,127 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2018-2020, The Linux Foundation. All rights reserved. + */ + +#include +#include +#include +#include +#include + +#include "qrtr.h" + +struct qrtr_mhi_dev { + struct qrtr_endpoint ep; + struct mhi_device *mhi_dev; + struct device *dev; +}; + +/* From MHI to QRTR */ +static void qcom_mhi_qrtr_dl_callback(struct mhi_device *mhi_dev, + struct mhi_result *mhi_res) +{ + struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev); + int rc; + + if (!qdev || mhi_res->transaction_status) + return; + + rc = qrtr_endpoint_post(&qdev->ep, mhi_res->buf_addr, + mhi_res->bytes_xferd); + if (rc == -EINVAL) + dev_err(qdev->dev, "invalid ipcrouter packet\n"); +} + +/* From QRTR to MHI */ +static void qcom_mhi_qrtr_ul_callback(struct mhi_device *mhi_dev, + struct mhi_result *mhi_res) +{ + struct sk_buff *skb = (struct sk_buff *)mhi_res->buf_addr; + + if (skb->sk) + sock_put(skb->sk); + consume_skb(skb); +} + +/* Send data over MHI */ +static int qcom_mhi_qrtr_send(struct qrtr_endpoint *ep, struct sk_buff *skb) +{ + struct qrtr_mhi_dev *qdev = container_of(ep, struct qrtr_mhi_dev, ep); + int rc; + + rc = skb_linearize(skb); + if (rc) + goto free_skb; + + rc = mhi_queue_skb(qdev->mhi_dev, DMA_TO_DEVICE, skb, skb->len, + MHI_EOT); + if (rc) + goto free_skb; + + if (skb->sk) + sock_hold(skb->sk); + + return rc; + +free_skb: + kfree_skb(skb); + + return rc; +} + +static int qcom_mhi_qrtr_probe(struct mhi_device *mhi_dev, + const struct mhi_device_id *id) +{ + struct qrtr_mhi_dev *qdev; + int rc; + + qdev = devm_kzalloc(&mhi_dev->dev, sizeof(*qdev), GFP_KERNEL); + if (!qdev) + return -ENOMEM; + + qdev->mhi_dev = mhi_dev; + qdev->dev = &mhi_dev->dev; + qdev->ep.xmit = qcom_mhi_qrtr_send; + + dev_set_drvdata(&mhi_dev->dev, qdev); + rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO); + if (rc) + return rc; + + dev_dbg(qdev->dev, "Qualcomm MHI QRTR driver probed\n"); + + return 0; +} + +static void qcom_mhi_qrtr_remove(struct mhi_device *mhi_dev) +{ + struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev); + + qrtr_endpoint_unregister(&qdev->ep); + dev_set_drvdata(&mhi_dev->dev, NULL); +} + +static const struct mhi_device_id qcom_mhi_qrtr_id_table[] = { + { .chan = "IPCR" }, + {} +}; +MODULE_DEVICE_TABLE(mhi, qcom_mhi_qrtr_id_table); + +static struct mhi_driver qcom_mhi_qrtr_driver = { + .probe = qcom_mhi_qrtr_probe, + .remove = qcom_mhi_qrtr_remove, + .dl_xfer_cb = qcom_mhi_qrtr_dl_callback, + .ul_xfer_cb = qcom_mhi_qrtr_ul_callback, + .id_table = qcom_mhi_qrtr_id_table, + .driver = { + .name = "qcom_mhi_qrtr", + }, +}; + +module_mhi_driver(qcom_mhi_qrtr_driver); + +MODULE_AUTHOR("Chris Lew "); +MODULE_AUTHOR("Manivannan Sadhasivam "); +MODULE_DESCRIPTION("Qualcomm IPC-Router MHI interface driver"); +MODULE_LICENSE("GPL v2");