From patchwork Thu Jan 23 11:18:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam X-Patchwork-Id: 11347391 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 C0D061580 for ; Thu, 23 Jan 2020 11:19:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9599D2468A for ; Thu, 23 Jan 2020 11:19:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="XzteJ0Mc" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729247AbgAWLTg (ORCPT ); Thu, 23 Jan 2020 06:19:36 -0500 Received: from mail-pf1-f196.google.com ([209.85.210.196]:38466 "EHLO mail-pf1-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729332AbgAWLTg (ORCPT ); Thu, 23 Jan 2020 06:19:36 -0500 Received: by mail-pf1-f196.google.com with SMTP id x185so1398495pfc.5 for ; Thu, 23 Jan 2020 03:19:35 -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=Ukx4iY1w5PIZZr/tp1rLHRN10AfBkKKAjf4yqGYrtY8=; b=XzteJ0McGxr8yGC69FvIg6tDYBJaUR1ljvQl4iGMJhAcD1Ik4DCamYe8lNeBO7IUdE hZ/sSgaD3meyWQuaGjQeAaLSa4tlTnTNjDOUKQwlJIoiGePebKH/1PKyLyivohuQtMWR CNrtmp1Of0QAGg5qhxN17uErIzJf8svvojHxNMezTHzLet/N3iq3k70MYpMRBa+OWd5b Vimeeg7QmjF2gXHVlz8iSbtqScbkY37e9YRsny6eoRAqHeN67OMHjSS55DDByLnxsWZg ROQq+IOBcFPXm66/jVrY9hoJtzyCTgCROODA0bwcVSWJwOv3NoUd2r6DZzkM/0VTo5BA P0aw== 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=Ukx4iY1w5PIZZr/tp1rLHRN10AfBkKKAjf4yqGYrtY8=; b=OTya1r1DLh2iyFhd93ZdVKdUQyES52eBvovF7+YaQqj/TxPUNy0ki/N6cyIwN2h2zm m478+nrTIKRC8CPsgzE7xE6cHouLm3hH+/vgjEEc8wk1HC2QuC+6+LDMyj0X1CQX/QRS A3bm2L2A706jmomRq7NUwrMYkaaaYzjzXh67ip8mRuQ7xrR8LxIvMaMKR7qtRyUOqh96 FkikRCCedTaU8JszXR+Y/uSQsCe+qtlqX/FMW3gA2E1EqiqC4zngvVqIjnTP/wSOp78G M3bMVfoje1HfInxk4UdzIekmL+5EC48l4lndL9Xc5poPy95x1AeqnRwjGPgvGcj8jgVr EyLw== X-Gm-Message-State: APjAAAUaK2pWkWcI48MaZnd6MPkJ8qIFgLZT+WbHYwuXB1/9nOW8qzFI z/ahmyr9uUad0pkd2ojuXqk0 X-Google-Smtp-Source: APXvYqxafqul6E4O9BXwlF3ZthPhBMm6khKx+XLokgdHv+MLUPODxAaz93qM3QZENaefduFbbQDaWg== X-Received: by 2002:a63:28a:: with SMTP id 132mr3365730pgc.165.1579778375131; Thu, 23 Jan 2020 03:19:35 -0800 (PST) Received: from localhost.localdomain ([103.59.133.81]) by smtp.googlemail.com with ESMTPSA id y6sm2627559pgc.10.2020.01.23.03.19.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 Jan 2020 03:19:33 -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 14/16] net: qrtr: Add MHI transport layer Date: Thu, 23 Jan 2020 16:48:34 +0530 Message-Id: <20200123111836.7414-15-manivannan.sadhasivam@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200123111836.7414-1-manivannan.sadhasivam@linaro.org> References: <20200123111836.7414-1-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 | 207 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 216 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..c85041a22f85 --- /dev/null +++ b/net/qrtr/mhi.c @@ -0,0 +1,207 @@ +// 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_transfer(qdev->mhi_dev, DMA_TO_DEVICE, skb, skb->len, + MHI_EOT); + if (rc) { + list_del(&pkt->node); + kfree_skb(skb); + kfree(pkt); + 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");