Loading net/qrtr/Kconfig +9 −0 Original line number Diff line number Diff line Loading @@ -40,4 +40,13 @@ 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 transport fakes synchronous sends by waiting for the uplink callback from the MHI framework before returing to qrtr core. endif # QRTR net/qrtr/Makefile +2 −0 Original line number Diff line number Diff line Loading @@ -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 net/qrtr/mhi.c 0 → 100644 +215 −0 Original line number Diff line number Diff line // SPDX-License-Identifier: GPL-2.0-only /* Copyright (c) 2018-2020, 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 <linux/of.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; 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 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; unsigned long flags; spin_lock_irqsave(&qdev->ul_lock, flags); if (list_empty(&qdev->ul_pkts)) { spin_unlock_irqrestore(&qdev->ul_lock, flags); dev_err(qdev->dev, "ul_pkt list is empty\n"); return; } 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); } /* fatal error */ static void qcom_mhi_qrtr_status_callback(struct mhi_device *mhi_dev, enum MHI_CB 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); } /* 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 (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; bool rt; 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); rc = of_property_read_u32(mhi_dev->dev.of_node, "qcom,net-id", &net_id); if (rc < 0) net_id = QRTR_EP_NET_ID_AUTO; rt = of_property_read_bool(mhi_dev->dev.of_node, "qcom,low-latency"); INIT_LIST_HEAD(&qdev->ul_pkts); spin_lock_init(&qdev->ul_lock); rc = qrtr_endpoint_register(&qdev->ep, net_id, rt); 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, .status_cb = qcom_mhi_qrtr_status_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"); Loading
net/qrtr/Kconfig +9 −0 Original line number Diff line number Diff line Loading @@ -40,4 +40,13 @@ 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 transport fakes synchronous sends by waiting for the uplink callback from the MHI framework before returing to qrtr core. endif # QRTR
net/qrtr/Makefile +2 −0 Original line number Diff line number Diff line Loading @@ -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
net/qrtr/mhi.c 0 → 100644 +215 −0 Original line number Diff line number Diff line // SPDX-License-Identifier: GPL-2.0-only /* Copyright (c) 2018-2020, 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 <linux/of.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; 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 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; unsigned long flags; spin_lock_irqsave(&qdev->ul_lock, flags); if (list_empty(&qdev->ul_pkts)) { spin_unlock_irqrestore(&qdev->ul_lock, flags); dev_err(qdev->dev, "ul_pkt list is empty\n"); return; } 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); } /* fatal error */ static void qcom_mhi_qrtr_status_callback(struct mhi_device *mhi_dev, enum MHI_CB 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); } /* 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 (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; bool rt; 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); rc = of_property_read_u32(mhi_dev->dev.of_node, "qcom,net-id", &net_id); if (rc < 0) net_id = QRTR_EP_NET_ID_AUTO; rt = of_property_read_bool(mhi_dev->dev.of_node, "qcom,low-latency"); INIT_LIST_HEAD(&qdev->ul_pkts); spin_lock_init(&qdev->ul_lock); rc = qrtr_endpoint_register(&qdev->ep, net_id, rt); 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, .status_cb = qcom_mhi_qrtr_status_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");
