From patchwork Thu Feb 20 09:58:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 11393729 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 30737930 for ; Thu, 20 Feb 2020 10:00:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 092292468A for ; Thu, 20 Feb 2020 10:00:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="JsLXXU41" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727277AbgBTKAZ (ORCPT ); Thu, 20 Feb 2020 05:00:25 -0500 Received: from mail-pl1-f195.google.com ([209.85.214.195]:46756 "EHLO mail-pl1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727576AbgBTKAW (ORCPT ); Thu, 20 Feb 2020 05:00:22 -0500 Received: by mail-pl1-f195.google.com with SMTP id y8so1345547pll.13 for ; Thu, 20 Feb 2020 02:00:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=JcAoPiKM9Q2Ld6e3l3XnfEAo/r6es8deaGEWWBZP3xY=; b=JsLXXU41fFM9v/N7RLJXlYod7HcMesRcTdG0JRKAqHbMFQDgmEI2tNcIhyZrrKuH7W vgrEOSoo3pH3xYs18q+naP7kIPUs862rqgV1Y6gv2l8xN5TsysEotuGDKO22MapZBY1h m8XMPmgUx7T33EJaJS82M/oIuE9qGBko71HatfK5AzyaRHlEUm2ZXvR0JUoKVflq6zOm BnWe0lFP/R0xCzkW+SOEFIQ7T1S8GEJyQZ6WF8nooc7uRJRqoOHL63l3pQY71j7d+YxJ +pHZGO+18xhQ7Twlwa2Ub0kf+TkXzvQJCHgllYp7jAfpEcfpSogOn+GBe/4XM+pZjoQ+ 11UQ== 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:in-reply-to :references; bh=JcAoPiKM9Q2Ld6e3l3XnfEAo/r6es8deaGEWWBZP3xY=; b=MF7r/OzauYpNyxsSR/ek8x4AIozL5FHDrtoYqsVXr3QTmFHrq7A7g6wqMSAT8Nrrw4 Rgi+hwhRBGSXDrwv+7VCqXORLr/egIKMLt0ErCDt4xZFimSVDu/c+QPe0SfL5npe0PHp dZGbycC+43o/vRXfSaTv0Fspi41FcXKxLXholdwVDLG8OPJnAtCtH9f8FQCCRtqgS70C WBq5u/BCVQDqKFaHwM6olobaqsHIDz/1ndqM5Iaix0gG4e8ib9KgZYBVCUUbjDF7dIuk YyDgHxNF9LGQsEIaXIzEanDatobBXsWyTMjnqPDD3RmLsoYJVfR/Y4basuEvPZazMkQC k3HQ== X-Gm-Message-State: APjAAAV2DY+4bI7ksGXgy6c3KQW/SrhI/yEZv2A2HcCJUTLoTXGpr4pY oMQ2gtSwjYTliXPOOU1Ou1U3 X-Google-Smtp-Source: APXvYqy2yQs1kbqiXi5gXHHAmrsH8FXJwf/eSy8xQ7wl6sen4Nax7ZtnuuSBrgd9HLQRq8hRJT1cxg== X-Received: by 2002:a17:90a:cc02:: with SMTP id b2mr2520142pju.137.1582192820686; Thu, 20 Feb 2020 02:00:20 -0800 (PST) Received: from localhost.localdomain ([2409:4072:315:9501:edda:4222:88ae:442f]) by smtp.gmail.com with ESMTPSA id b3sm2678644pjo.30.2020.02.20.02.00.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 20 Feb 2020 02:00:20 -0800 (PST) From: Manivannan Sadhasivam To: gregkh@linuxfoundation.org, arnd@arndb.de Cc: smohanad@codeaurora.org, jhugo@codeaurora.org, kvalo@codeaurora.org, bjorn.andersson@linaro.org, hemantk@codeaurora.org, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, Manivannan Sadhasivam , "David S. Miller" , netdev@vger.kernel.org Subject: [PATCH v3 14/16] net: qrtr: Add MHI transport layer Date: Thu, 20 Feb 2020 15:28:52 +0530 Message-Id: <20200220095854.4804-15-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200220095854.4804-1-manivannan.sadhasivam@linaro.org> References: <20200220095854.4804-1-manivannan.sadhasivam@linaro.org> 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. Cc: "David S. Miller" Cc: netdev@vger.kernel.org Signed-off-by: Manivannan Sadhasivam --- net/qrtr/Kconfig | 7 ++ net/qrtr/Makefile | 2 + net/qrtr/mhi.c | 209 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 218 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 1c6d6c120fb7..3dc0a7c9d455 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..fcfba3673d59 --- /dev/null +++ b/net/qrtr/mhi.c @@ -0,0 +1,209 @@ +// 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; + spinlock_t ul_lock; /* lock to protect ul_pkts */ + struct list_head ul_pkts; + atomic_t in_reset; +}; + +struct qrtr_mhi_pkt { + struct list_head node; + struct sk_buff *skb; + struct kref refcount; + struct completion done; +}; + +static void qrtr_mhi_pkt_release(struct kref *ref) +{ + struct qrtr_mhi_pkt *pkt = container_of(ref, struct qrtr_mhi_pkt, + refcount); + struct sock *sk = pkt->skb->sk; + + consume_skb(pkt->skb); + if (sk) + sock_put(sk); + + kfree(pkt); +} + +/* 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 qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev); + struct qrtr_mhi_pkt *pkt; + unsigned long flags; + + spin_lock_irqsave(&qdev->ul_lock, flags); + pkt = list_first_entry(&qdev->ul_pkts, struct qrtr_mhi_pkt, node); + list_del(&pkt->node); + complete_all(&pkt->done); + + kref_put(&pkt->refcount, qrtr_mhi_pkt_release); + spin_unlock_irqrestore(&qdev->ul_lock, flags); +} + +static void qcom_mhi_qrtr_status_callback(struct mhi_device *mhi_dev, + enum mhi_callback mhi_cb) +{ + struct qrtr_mhi_dev *qdev = dev_get_drvdata(&mhi_dev->dev); + struct qrtr_mhi_pkt *pkt; + unsigned long flags; + + if (mhi_cb != MHI_CB_FATAL_ERROR) + return; + + atomic_inc(&qdev->in_reset); + spin_lock_irqsave(&qdev->ul_lock, flags); + list_for_each_entry(pkt, &qdev->ul_pkts, node) + complete_all(&pkt->done); + spin_unlock_irqrestore(&qdev->ul_lock, flags); +} + +/* 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); + struct qrtr_mhi_pkt *pkt; + int rc; + + rc = skb_linearize(skb); + if (rc) { + kfree_skb(skb); + return rc; + } + + pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); + if (!pkt) { + kfree_skb(skb); + return -ENOMEM; + } + + init_completion(&pkt->done); + kref_init(&pkt->refcount); + kref_get(&pkt->refcount); + pkt->skb = skb; + + spin_lock_bh(&qdev->ul_lock); + list_add_tail(&pkt->node, &qdev->ul_pkts); + rc = mhi_queue_skb(qdev->mhi_dev, DMA_TO_DEVICE, skb, skb->len, + MHI_EOT); + if (rc) { + list_del(&pkt->node); + /* Reference count needs to be dropped 2 times */ + kref_put(&pkt->refcount, qrtr_mhi_pkt_release); + kref_put(&pkt->refcount, qrtr_mhi_pkt_release); + kfree_skb(skb); + spin_unlock_bh(&qdev->ul_lock); + return rc; + } + + spin_unlock_bh(&qdev->ul_lock); + if (skb->sk) + sock_hold(skb->sk); + + rc = wait_for_completion_interruptible_timeout(&pkt->done, HZ * 5); + if (atomic_read(&qdev->in_reset)) + rc = -ECONNRESET; + else if (rc == 0) + rc = -ETIMEDOUT; + else if (rc > 0) + rc = 0; + + kref_put(&pkt->refcount, qrtr_mhi_pkt_release); + + return rc; +} + +static int qcom_mhi_qrtr_probe(struct mhi_device *mhi_dev, + const struct mhi_device_id *id) +{ + struct qrtr_mhi_dev *qdev; + u32 net_id; + 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; + atomic_set(&qdev->in_reset, 0); + + net_id = QRTR_EP_NID_AUTO; + + INIT_LIST_HEAD(&qdev->ul_pkts); + spin_lock_init(&qdev->ul_lock); + + dev_set_drvdata(&mhi_dev->dev, qdev); + rc = qrtr_endpoint_register(&qdev->ep, net_id); + 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, + .status_cb = qcom_mhi_qrtr_status_callback, + .id_table = qcom_mhi_qrtr_id_table, + .driver = { + .name = "qcom_mhi_qrtr", + }, +}; + +module_driver(qcom_mhi_qrtr_driver, mhi_driver_register, + mhi_driver_unregister); + +MODULE_DESCRIPTION("Qualcomm IPC-Router MHI interface driver"); +MODULE_LICENSE("GPL v2");