Merge "net: qrtr: Add snapshot of QRTR drivers" (1a675f8d) · Commits · e / devices / android_kernel_oneplus_sm7250

net/qrtr/Kconfig

+10 −0

Original line number	Diff line number	Diff line
		@@ -28,4 +28,14 @@ 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 \|\| (COMPILE_TEST && MHI_BUS=n)
		help
		Say Y here to support MHI based ipcrouter channels. MHI is the
		transport used for external modem connections for IPC Router. The
		MHI bus provides an asynchronous send mechanism, the QRTR MHI
		transport will wait for the uplink callback notification before
		returning to qrtr.

		endif # QRTR

net/qrtr/Makefile

+2 −0

Original line number	Diff line number	Diff line
		@@ -4,3 +4,5 @@ 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

net/qrtr/mhi.c

0 → 100644

+177 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0
		/* Copyright (c) 2018, The Linux Foundation. All rights reserved. */

		#include <linux/module.h>
		#include <linux/skbuff.h>
		#include <linux/mod_devicetable.h>
		#include <linux/mhi.h>
		#include <net/sock.h>

		#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;
		};

		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 mhi to qrtr */
		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;

		spin_lock_bh(&qdev->ul_lock);
		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_bh(&qdev->ul_lock);
		}

		/* from qrtr to 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 (rc > 0)
		rc = 0;
		else if (rc == 0)
		rc = -ETIMEDOUT;

		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;
		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;

		INIT_LIST_HEAD(&qdev->ul_pkts);
		spin_lock_init(&qdev->ul_lock);

		rc = qrtr_endpoint_register(&qdev->ep, QRTR_EP_NID_AUTO);
		if (rc)
		return rc;

		dev_set_drvdata(&mhi_dev->dev, qdev);

		dev_dbg(qdev->dev, "QTI 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_mhi_match[] = {
		{ .chan = "IPCR" },
		{}
		};

		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_mhi_match,
		.driver = {
		.name = "qcom_mhi_qrtr",
		.owner = THIS_MODULE,
		},
		};

		module_driver(qcom_mhi_qrtr_driver, mhi_driver_register,
		mhi_driver_unregister);

		MODULE_DESCRIPTION("QTI IPC-Router MHI interface driver");
		MODULE_LICENSE("GPL v2");