2017-12-06 01:43:07 +08:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2017 Linaro Ltd.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/qrtr.h>
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#include <linux/net.h>
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#include <linux/completion.h>
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#include <linux/idr.h>
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#include <linux/string.h>
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#include <net/sock.h>
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#include <linux/workqueue.h>
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#include <linux/soc/qcom/qmi.h>
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static struct socket *qmi_sock_create(struct qmi_handle *qmi,
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struct sockaddr_qrtr *sq);
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/**
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* qmi_recv_new_server() - handler of NEW_SERVER control message
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* @qmi: qmi handle
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* @service: service id of the new server
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* @instance: instance id of the new server
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* @node: node of the new server
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* @port: port of the new server
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*
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* Calls the new_server callback to inform the client about a newly registered
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* server matching the currently registered service lookup.
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*/
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static void qmi_recv_new_server(struct qmi_handle *qmi,
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unsigned int service, unsigned int instance,
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unsigned int node, unsigned int port)
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{
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struct qmi_ops *ops = &qmi->ops;
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struct qmi_service *svc;
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int ret;
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if (!ops->new_server)
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return;
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/* Ignore EOF marker */
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if (!node && !port)
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return;
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svc = kzalloc(sizeof(*svc), GFP_KERNEL);
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if (!svc)
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return;
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svc->service = service;
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svc->version = instance & 0xff;
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svc->instance = instance >> 8;
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svc->node = node;
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svc->port = port;
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ret = ops->new_server(qmi, svc);
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if (ret < 0)
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kfree(svc);
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else
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list_add(&svc->list_node, &qmi->lookup_results);
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}
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/**
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* qmi_recv_del_server() - handler of DEL_SERVER control message
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* @qmi: qmi handle
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* @node: node of the dying server, a value of -1 matches all nodes
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* @port: port of the dying server, a value of -1 matches all ports
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*
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* Calls the del_server callback for each previously seen server, allowing the
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* client to react to the disappearing server.
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*/
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static void qmi_recv_del_server(struct qmi_handle *qmi,
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unsigned int node, unsigned int port)
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{
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struct qmi_ops *ops = &qmi->ops;
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struct qmi_service *svc;
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struct qmi_service *tmp;
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list_for_each_entry_safe(svc, tmp, &qmi->lookup_results, list_node) {
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if (node != -1 && svc->node != node)
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continue;
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if (port != -1 && svc->port != port)
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continue;
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if (ops->del_server)
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ops->del_server(qmi, svc);
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list_del(&svc->list_node);
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kfree(svc);
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}
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}
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/**
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* qmi_recv_bye() - handler of BYE control message
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* @qmi: qmi handle
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* @node: id of the dying node
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*
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* Signals the client that all previously registered services on this node are
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* now gone and then calls the bye callback to allow the client client further
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* cleaning up resources associated with this remote.
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*/
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static void qmi_recv_bye(struct qmi_handle *qmi,
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unsigned int node)
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{
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struct qmi_ops *ops = &qmi->ops;
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qmi_recv_del_server(qmi, node, -1);
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if (ops->bye)
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ops->bye(qmi, node);
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}
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/**
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* qmi_recv_del_client() - handler of DEL_CLIENT control message
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* @qmi: qmi handle
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* @node: node of the dying client
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* @port: port of the dying client
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*
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* Signals the client about a dying client, by calling the del_client callback.
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*/
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static void qmi_recv_del_client(struct qmi_handle *qmi,
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unsigned int node, unsigned int port)
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{
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struct qmi_ops *ops = &qmi->ops;
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if (ops->del_client)
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ops->del_client(qmi, node, port);
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}
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static void qmi_recv_ctrl_pkt(struct qmi_handle *qmi,
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const void *buf, size_t len)
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{
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const struct qrtr_ctrl_pkt *pkt = buf;
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if (len < sizeof(struct qrtr_ctrl_pkt)) {
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pr_debug("ignoring short control packet\n");
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return;
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}
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switch (le32_to_cpu(pkt->cmd)) {
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case QRTR_TYPE_BYE:
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qmi_recv_bye(qmi, le32_to_cpu(pkt->client.node));
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break;
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case QRTR_TYPE_NEW_SERVER:
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qmi_recv_new_server(qmi,
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le32_to_cpu(pkt->server.service),
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le32_to_cpu(pkt->server.instance),
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le32_to_cpu(pkt->server.node),
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le32_to_cpu(pkt->server.port));
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break;
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case QRTR_TYPE_DEL_SERVER:
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qmi_recv_del_server(qmi,
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le32_to_cpu(pkt->server.node),
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le32_to_cpu(pkt->server.port));
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break;
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case QRTR_TYPE_DEL_CLIENT:
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qmi_recv_del_client(qmi,
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le32_to_cpu(pkt->client.node),
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le32_to_cpu(pkt->client.port));
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break;
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}
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}
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static void qmi_send_new_lookup(struct qmi_handle *qmi, struct qmi_service *svc)
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{
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struct qrtr_ctrl_pkt pkt;
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struct sockaddr_qrtr sq;
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struct msghdr msg = { };
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struct kvec iv = { &pkt, sizeof(pkt) };
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int ret;
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memset(&pkt, 0, sizeof(pkt));
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pkt.cmd = cpu_to_le32(QRTR_TYPE_NEW_LOOKUP);
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pkt.server.service = cpu_to_le32(svc->service);
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pkt.server.instance = cpu_to_le32(svc->version | svc->instance << 8);
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sq.sq_family = qmi->sq.sq_family;
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sq.sq_node = qmi->sq.sq_node;
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sq.sq_port = QRTR_PORT_CTRL;
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msg.msg_name = &sq;
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msg.msg_namelen = sizeof(sq);
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mutex_lock(&qmi->sock_lock);
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if (qmi->sock) {
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ret = kernel_sendmsg(qmi->sock, &msg, &iv, 1, sizeof(pkt));
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if (ret < 0)
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pr_err("failed to send lookup registration: %d\n", ret);
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}
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mutex_unlock(&qmi->sock_lock);
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}
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/**
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* qmi_add_lookup() - register a new lookup with the name service
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* @qmi: qmi handle
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* @service: service id of the request
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* @instance: instance id of the request
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* @version: version number of the request
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*
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* Registering a lookup query with the name server will cause the name server
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* to send NEW_SERVER and DEL_SERVER control messages to this socket as
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* matching services are registered.
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*
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* Return: 0 on success, negative errno on failure.
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*/
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int qmi_add_lookup(struct qmi_handle *qmi, unsigned int service,
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unsigned int version, unsigned int instance)
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{
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struct qmi_service *svc;
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svc = kzalloc(sizeof(*svc), GFP_KERNEL);
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if (!svc)
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return -ENOMEM;
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svc->service = service;
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svc->version = version;
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svc->instance = instance;
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list_add(&svc->list_node, &qmi->lookups);
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qmi_send_new_lookup(qmi, svc);
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return 0;
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}
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EXPORT_SYMBOL(qmi_add_lookup);
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static void qmi_send_new_server(struct qmi_handle *qmi, struct qmi_service *svc)
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{
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struct qrtr_ctrl_pkt pkt;
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struct sockaddr_qrtr sq;
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struct msghdr msg = { };
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struct kvec iv = { &pkt, sizeof(pkt) };
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int ret;
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memset(&pkt, 0, sizeof(pkt));
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pkt.cmd = cpu_to_le32(QRTR_TYPE_NEW_SERVER);
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pkt.server.service = cpu_to_le32(svc->service);
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pkt.server.instance = cpu_to_le32(svc->version | svc->instance << 8);
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pkt.server.node = cpu_to_le32(qmi->sq.sq_node);
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pkt.server.port = cpu_to_le32(qmi->sq.sq_port);
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sq.sq_family = qmi->sq.sq_family;
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sq.sq_node = qmi->sq.sq_node;
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sq.sq_port = QRTR_PORT_CTRL;
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msg.msg_name = &sq;
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msg.msg_namelen = sizeof(sq);
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mutex_lock(&qmi->sock_lock);
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if (qmi->sock) {
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ret = kernel_sendmsg(qmi->sock, &msg, &iv, 1, sizeof(pkt));
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if (ret < 0)
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pr_err("send service registration failed: %d\n", ret);
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}
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mutex_unlock(&qmi->sock_lock);
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}
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/**
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* qmi_add_server() - register a service with the name service
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* @qmi: qmi handle
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* @service: type of the service
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* @instance: instance of the service
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* @version: version of the service
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*
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* Register a new service with the name service. This allows clients to find
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* and start sending messages to the client associated with @qmi.
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*
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* Return: 0 on success, negative errno on failure.
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*/
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int qmi_add_server(struct qmi_handle *qmi, unsigned int service,
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unsigned int version, unsigned int instance)
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{
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struct qmi_service *svc;
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svc = kzalloc(sizeof(*svc), GFP_KERNEL);
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if (!svc)
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return -ENOMEM;
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svc->service = service;
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svc->version = version;
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svc->instance = instance;
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list_add(&svc->list_node, &qmi->services);
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qmi_send_new_server(qmi, svc);
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return 0;
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}
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EXPORT_SYMBOL(qmi_add_server);
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/**
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* qmi_txn_init() - allocate transaction id within the given QMI handle
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* @qmi: QMI handle
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* @txn: transaction context
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* @ei: description of how to decode a matching response (optional)
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* @c_struct: pointer to the object to decode the response into (optional)
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*
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* This allocates a transaction id within the QMI handle. If @ei and @c_struct
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* are specified any responses to this transaction will be decoded as described
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* by @ei into @c_struct.
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*
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* A client calling qmi_txn_init() must call either qmi_txn_wait() or
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* qmi_txn_cancel() to free up the allocated resources.
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*
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* Return: Transaction id on success, negative errno on failure.
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*/
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int qmi_txn_init(struct qmi_handle *qmi, struct qmi_txn *txn,
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struct qmi_elem_info *ei, void *c_struct)
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{
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int ret;
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memset(txn, 0, sizeof(*txn));
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mutex_init(&txn->lock);
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init_completion(&txn->completion);
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txn->qmi = qmi;
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txn->ei = ei;
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txn->dest = c_struct;
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mutex_lock(&qmi->txn_lock);
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2018-10-03 13:40:02 +08:00
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ret = idr_alloc_cyclic(&qmi->txns, txn, 0, U16_MAX, GFP_KERNEL);
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2017-12-06 01:43:07 +08:00
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if (ret < 0)
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pr_err("failed to allocate transaction id\n");
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txn->id = ret;
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mutex_unlock(&qmi->txn_lock);
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return ret;
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}
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EXPORT_SYMBOL(qmi_txn_init);
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/**
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* qmi_txn_wait() - wait for a response on a transaction
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* @txn: transaction handle
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* @timeout: timeout, in jiffies
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*
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* If the transaction is decoded by the means of @ei and @c_struct the return
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* value will be the returned value of qmi_decode_message(), otherwise it's up
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* to the specified message handler to fill out the result.
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*
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* Return: the transaction response on success, negative errno on failure.
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*/
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int qmi_txn_wait(struct qmi_txn *txn, unsigned long timeout)
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{
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struct qmi_handle *qmi = txn->qmi;
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int ret;
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2019-02-22 10:33:39 +08:00
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ret = wait_for_completion_timeout(&txn->completion, timeout);
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2017-12-06 01:43:07 +08:00
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mutex_lock(&qmi->txn_lock);
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mutex_lock(&txn->lock);
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idr_remove(&qmi->txns, txn->id);
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mutex_unlock(&txn->lock);
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mutex_unlock(&qmi->txn_lock);
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2019-02-22 10:33:39 +08:00
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if (ret == 0)
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2017-12-06 01:43:07 +08:00
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return -ETIMEDOUT;
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else
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return txn->result;
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}
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EXPORT_SYMBOL(qmi_txn_wait);
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/**
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* qmi_txn_cancel() - cancel an ongoing transaction
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* @txn: transaction id
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*/
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|
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void qmi_txn_cancel(struct qmi_txn *txn)
|
|
|
|
{
|
|
|
|
struct qmi_handle *qmi = txn->qmi;
|
|
|
|
|
|
|
|
mutex_lock(&qmi->txn_lock);
|
|
|
|
mutex_lock(&txn->lock);
|
|
|
|
idr_remove(&qmi->txns, txn->id);
|
|
|
|
mutex_unlock(&txn->lock);
|
|
|
|
mutex_unlock(&qmi->txn_lock);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(qmi_txn_cancel);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* qmi_invoke_handler() - find and invoke a handler for a message
|
|
|
|
* @qmi: qmi handle
|
|
|
|
* @sq: sockaddr of the sender
|
|
|
|
* @txn: transaction object for the message
|
|
|
|
* @buf: buffer containing the message
|
|
|
|
* @len: length of @buf
|
|
|
|
*
|
|
|
|
* Find handler and invoke handler for the incoming message.
|
|
|
|
*/
|
|
|
|
static void qmi_invoke_handler(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
|
|
|
|
struct qmi_txn *txn, const void *buf, size_t len)
|
|
|
|
{
|
|
|
|
const struct qmi_msg_handler *handler;
|
|
|
|
const struct qmi_header *hdr = buf;
|
|
|
|
void *dest;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (!qmi->handlers)
|
|
|
|
return;
|
|
|
|
|
|
|
|
for (handler = qmi->handlers; handler->fn; handler++) {
|
|
|
|
if (handler->type == hdr->type &&
|
|
|
|
handler->msg_id == hdr->msg_id)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!handler->fn)
|
|
|
|
return;
|
|
|
|
|
|
|
|
dest = kzalloc(handler->decoded_size, GFP_KERNEL);
|
|
|
|
if (!dest)
|
|
|
|
return;
|
|
|
|
|
|
|
|
ret = qmi_decode_message(buf, len, handler->ei, dest);
|
|
|
|
if (ret < 0)
|
|
|
|
pr_err("failed to decode incoming message\n");
|
|
|
|
else
|
|
|
|
handler->fn(qmi, sq, txn, dest);
|
|
|
|
|
|
|
|
kfree(dest);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* qmi_handle_net_reset() - invoked to handle ENETRESET on a QMI handle
|
|
|
|
* @qmi: the QMI context
|
|
|
|
*
|
|
|
|
* As a result of registering a name service with the QRTR all open sockets are
|
|
|
|
* flagged with ENETRESET and this function will be called. The typical case is
|
|
|
|
* the initial boot, where this signals that the local node id has been
|
|
|
|
* configured and as such any bound sockets needs to be rebound. So close the
|
|
|
|
* socket, inform the client and re-initialize the socket.
|
|
|
|
*
|
|
|
|
* For clients it's generally sufficient to react to the del_server callbacks,
|
|
|
|
* but server code is expected to treat the net_reset callback as a "bye" from
|
|
|
|
* all nodes.
|
|
|
|
*
|
|
|
|
* Finally the QMI handle will send out registration requests for any lookups
|
|
|
|
* and services.
|
|
|
|
*/
|
|
|
|
static void qmi_handle_net_reset(struct qmi_handle *qmi)
|
|
|
|
{
|
|
|
|
struct sockaddr_qrtr sq;
|
|
|
|
struct qmi_service *svc;
|
|
|
|
struct socket *sock;
|
|
|
|
|
|
|
|
sock = qmi_sock_create(qmi, &sq);
|
|
|
|
if (IS_ERR(sock))
|
|
|
|
return;
|
|
|
|
|
|
|
|
mutex_lock(&qmi->sock_lock);
|
|
|
|
sock_release(qmi->sock);
|
|
|
|
qmi->sock = NULL;
|
|
|
|
mutex_unlock(&qmi->sock_lock);
|
|
|
|
|
|
|
|
qmi_recv_del_server(qmi, -1, -1);
|
|
|
|
|
|
|
|
if (qmi->ops.net_reset)
|
|
|
|
qmi->ops.net_reset(qmi);
|
|
|
|
|
|
|
|
mutex_lock(&qmi->sock_lock);
|
|
|
|
qmi->sock = sock;
|
|
|
|
qmi->sq = sq;
|
|
|
|
mutex_unlock(&qmi->sock_lock);
|
|
|
|
|
|
|
|
list_for_each_entry(svc, &qmi->lookups, list_node)
|
|
|
|
qmi_send_new_lookup(qmi, svc);
|
|
|
|
|
|
|
|
list_for_each_entry(svc, &qmi->services, list_node)
|
|
|
|
qmi_send_new_server(qmi, svc);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void qmi_handle_message(struct qmi_handle *qmi,
|
|
|
|
struct sockaddr_qrtr *sq,
|
|
|
|
const void *buf, size_t len)
|
|
|
|
{
|
|
|
|
const struct qmi_header *hdr;
|
|
|
|
struct qmi_txn tmp_txn;
|
|
|
|
struct qmi_txn *txn = NULL;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
if (len < sizeof(*hdr)) {
|
|
|
|
pr_err("ignoring short QMI packet\n");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
hdr = buf;
|
|
|
|
|
|
|
|
/* If this is a response, find the matching transaction handle */
|
|
|
|
if (hdr->type == QMI_RESPONSE) {
|
|
|
|
mutex_lock(&qmi->txn_lock);
|
|
|
|
txn = idr_find(&qmi->txns, hdr->txn_id);
|
|
|
|
|
|
|
|
/* Ignore unexpected responses */
|
|
|
|
if (!txn) {
|
|
|
|
mutex_unlock(&qmi->txn_lock);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
mutex_lock(&txn->lock);
|
|
|
|
mutex_unlock(&qmi->txn_lock);
|
|
|
|
|
|
|
|
if (txn->dest && txn->ei) {
|
|
|
|
ret = qmi_decode_message(buf, len, txn->ei, txn->dest);
|
|
|
|
if (ret < 0)
|
|
|
|
pr_err("failed to decode incoming message\n");
|
|
|
|
|
|
|
|
txn->result = ret;
|
|
|
|
complete(&txn->completion);
|
|
|
|
} else {
|
|
|
|
qmi_invoke_handler(qmi, sq, txn, buf, len);
|
|
|
|
}
|
|
|
|
|
|
|
|
mutex_unlock(&txn->lock);
|
|
|
|
} else {
|
|
|
|
/* Create a txn based on the txn_id of the incoming message */
|
|
|
|
memset(&tmp_txn, 0, sizeof(tmp_txn));
|
|
|
|
tmp_txn.id = hdr->txn_id;
|
|
|
|
|
|
|
|
qmi_invoke_handler(qmi, sq, &tmp_txn, buf, len);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void qmi_data_ready_work(struct work_struct *work)
|
|
|
|
{
|
|
|
|
struct qmi_handle *qmi = container_of(work, struct qmi_handle, work);
|
|
|
|
struct qmi_ops *ops = &qmi->ops;
|
|
|
|
struct sockaddr_qrtr sq;
|
|
|
|
struct msghdr msg = { .msg_name = &sq, .msg_namelen = sizeof(sq) };
|
|
|
|
struct kvec iv;
|
|
|
|
ssize_t msglen;
|
|
|
|
|
|
|
|
for (;;) {
|
|
|
|
iv.iov_base = qmi->recv_buf;
|
|
|
|
iv.iov_len = qmi->recv_buf_size;
|
|
|
|
|
|
|
|
mutex_lock(&qmi->sock_lock);
|
|
|
|
if (qmi->sock)
|
|
|
|
msglen = kernel_recvmsg(qmi->sock, &msg, &iv, 1,
|
|
|
|
iv.iov_len, MSG_DONTWAIT);
|
|
|
|
else
|
|
|
|
msglen = -EPIPE;
|
|
|
|
mutex_unlock(&qmi->sock_lock);
|
|
|
|
if (msglen == -EAGAIN)
|
|
|
|
break;
|
|
|
|
|
|
|
|
if (msglen == -ENETRESET) {
|
|
|
|
qmi_handle_net_reset(qmi);
|
|
|
|
|
|
|
|
/* The old qmi->sock is gone, our work is done */
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (msglen < 0) {
|
|
|
|
pr_err("qmi recvmsg failed: %zd\n", msglen);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (sq.sq_node == qmi->sq.sq_node &&
|
|
|
|
sq.sq_port == QRTR_PORT_CTRL) {
|
|
|
|
qmi_recv_ctrl_pkt(qmi, qmi->recv_buf, msglen);
|
|
|
|
} else if (ops->msg_handler) {
|
|
|
|
ops->msg_handler(qmi, &sq, qmi->recv_buf, msglen);
|
|
|
|
} else {
|
|
|
|
qmi_handle_message(qmi, &sq, qmi->recv_buf, msglen);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
static void qmi_data_ready(struct sock *sk)
|
|
|
|
{
|
|
|
|
struct qmi_handle *qmi = sk->sk_user_data;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* This will be NULL if we receive data while being in
|
|
|
|
* qmi_handle_release()
|
|
|
|
*/
|
|
|
|
if (!qmi)
|
|
|
|
return;
|
|
|
|
|
|
|
|
queue_work(qmi->wq, &qmi->work);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct socket *qmi_sock_create(struct qmi_handle *qmi,
|
|
|
|
struct sockaddr_qrtr *sq)
|
|
|
|
{
|
|
|
|
struct socket *sock;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = sock_create_kern(&init_net, AF_QIPCRTR, SOCK_DGRAM,
|
|
|
|
PF_QIPCRTR, &sock);
|
|
|
|
if (ret < 0)
|
|
|
|
return ERR_PTR(ret);
|
|
|
|
|
2018-02-13 03:00:20 +08:00
|
|
|
ret = kernel_getsockname(sock, (struct sockaddr *)sq);
|
2017-12-06 01:43:07 +08:00
|
|
|
if (ret < 0) {
|
|
|
|
sock_release(sock);
|
|
|
|
return ERR_PTR(ret);
|
|
|
|
}
|
|
|
|
|
|
|
|
sock->sk->sk_user_data = qmi;
|
|
|
|
sock->sk->sk_data_ready = qmi_data_ready;
|
|
|
|
sock->sk->sk_error_report = qmi_data_ready;
|
|
|
|
|
|
|
|
return sock;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* qmi_handle_init() - initialize a QMI client handle
|
|
|
|
* @qmi: QMI handle to initialize
|
|
|
|
* @recv_buf_size: maximum size of incoming message
|
|
|
|
* @ops: reference to callbacks for QRTR notifications
|
|
|
|
* @handlers: NULL-terminated list of QMI message handlers
|
|
|
|
*
|
|
|
|
* This initializes the QMI client handle to allow sending and receiving QMI
|
|
|
|
* messages. As messages are received the appropriate handler will be invoked.
|
|
|
|
*
|
|
|
|
* Return: 0 on success, negative errno on failure.
|
|
|
|
*/
|
|
|
|
int qmi_handle_init(struct qmi_handle *qmi, size_t recv_buf_size,
|
|
|
|
const struct qmi_ops *ops,
|
|
|
|
const struct qmi_msg_handler *handlers)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
mutex_init(&qmi->txn_lock);
|
|
|
|
mutex_init(&qmi->sock_lock);
|
|
|
|
|
|
|
|
idr_init(&qmi->txns);
|
|
|
|
|
|
|
|
INIT_LIST_HEAD(&qmi->lookups);
|
|
|
|
INIT_LIST_HEAD(&qmi->lookup_results);
|
|
|
|
INIT_LIST_HEAD(&qmi->services);
|
|
|
|
|
|
|
|
INIT_WORK(&qmi->work, qmi_data_ready_work);
|
|
|
|
|
|
|
|
qmi->handlers = handlers;
|
|
|
|
if (ops)
|
|
|
|
qmi->ops = *ops;
|
|
|
|
|
2018-04-27 22:08:17 +08:00
|
|
|
/* Make room for the header */
|
|
|
|
recv_buf_size += sizeof(struct qmi_header);
|
|
|
|
/* Must also be sufficient to hold a control packet */
|
2017-12-06 01:43:07 +08:00
|
|
|
if (recv_buf_size < sizeof(struct qrtr_ctrl_pkt))
|
|
|
|
recv_buf_size = sizeof(struct qrtr_ctrl_pkt);
|
|
|
|
|
|
|
|
qmi->recv_buf_size = recv_buf_size;
|
|
|
|
qmi->recv_buf = kzalloc(recv_buf_size, GFP_KERNEL);
|
|
|
|
if (!qmi->recv_buf)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
qmi->wq = alloc_workqueue("qmi_msg_handler", WQ_UNBOUND, 1);
|
|
|
|
if (!qmi->wq) {
|
|
|
|
ret = -ENOMEM;
|
|
|
|
goto err_free_recv_buf;
|
|
|
|
}
|
|
|
|
|
|
|
|
qmi->sock = qmi_sock_create(qmi, &qmi->sq);
|
|
|
|
if (IS_ERR(qmi->sock)) {
|
2019-11-07 07:05:11 +08:00
|
|
|
if (PTR_ERR(qmi->sock) == -EAFNOSUPPORT) {
|
|
|
|
ret = -EPROBE_DEFER;
|
|
|
|
} else {
|
|
|
|
pr_err("failed to create QMI socket\n");
|
|
|
|
ret = PTR_ERR(qmi->sock);
|
|
|
|
}
|
2017-12-06 01:43:07 +08:00
|
|
|
goto err_destroy_wq;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
err_destroy_wq:
|
|
|
|
destroy_workqueue(qmi->wq);
|
|
|
|
err_free_recv_buf:
|
|
|
|
kfree(qmi->recv_buf);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(qmi_handle_init);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* qmi_handle_release() - release the QMI client handle
|
|
|
|
* @qmi: QMI client handle
|
|
|
|
*
|
|
|
|
* This closes the underlying socket and stops any handling of QMI messages.
|
|
|
|
*/
|
|
|
|
void qmi_handle_release(struct qmi_handle *qmi)
|
|
|
|
{
|
|
|
|
struct socket *sock = qmi->sock;
|
|
|
|
struct qmi_service *svc, *tmp;
|
|
|
|
|
|
|
|
sock->sk->sk_user_data = NULL;
|
|
|
|
cancel_work_sync(&qmi->work);
|
|
|
|
|
|
|
|
qmi_recv_del_server(qmi, -1, -1);
|
|
|
|
|
|
|
|
mutex_lock(&qmi->sock_lock);
|
|
|
|
sock_release(sock);
|
|
|
|
qmi->sock = NULL;
|
|
|
|
mutex_unlock(&qmi->sock_lock);
|
|
|
|
|
|
|
|
destroy_workqueue(qmi->wq);
|
|
|
|
|
|
|
|
idr_destroy(&qmi->txns);
|
|
|
|
|
|
|
|
kfree(qmi->recv_buf);
|
|
|
|
|
|
|
|
/* Free registered lookup requests */
|
|
|
|
list_for_each_entry_safe(svc, tmp, &qmi->lookups, list_node) {
|
|
|
|
list_del(&svc->list_node);
|
|
|
|
kfree(svc);
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Free registered service information */
|
|
|
|
list_for_each_entry_safe(svc, tmp, &qmi->services, list_node) {
|
|
|
|
list_del(&svc->list_node);
|
|
|
|
kfree(svc);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(qmi_handle_release);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* qmi_send_message() - send a QMI message
|
|
|
|
* @qmi: QMI client handle
|
|
|
|
* @sq: destination sockaddr
|
|
|
|
* @txn: transaction object to use for the message
|
|
|
|
* @type: type of message to send
|
|
|
|
* @msg_id: message id
|
|
|
|
* @len: max length of the QMI message
|
|
|
|
* @ei: QMI message description
|
|
|
|
* @c_struct: object to be encoded
|
|
|
|
*
|
|
|
|
* This function encodes @c_struct using @ei into a message of type @type,
|
|
|
|
* with @msg_id and @txn into a buffer of maximum size @len, and sends this to
|
|
|
|
* @sq.
|
|
|
|
*
|
|
|
|
* Return: 0 on success, negative errno on failure.
|
|
|
|
*/
|
|
|
|
static ssize_t qmi_send_message(struct qmi_handle *qmi,
|
|
|
|
struct sockaddr_qrtr *sq, struct qmi_txn *txn,
|
|
|
|
int type, int msg_id, size_t len,
|
|
|
|
struct qmi_elem_info *ei, const void *c_struct)
|
|
|
|
{
|
|
|
|
struct msghdr msghdr = {};
|
|
|
|
struct kvec iv;
|
|
|
|
void *msg;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
msg = qmi_encode_message(type,
|
|
|
|
msg_id, &len,
|
|
|
|
txn->id, ei,
|
|
|
|
c_struct);
|
|
|
|
if (IS_ERR(msg))
|
|
|
|
return PTR_ERR(msg);
|
|
|
|
|
|
|
|
iv.iov_base = msg;
|
|
|
|
iv.iov_len = len;
|
|
|
|
|
|
|
|
if (sq) {
|
|
|
|
msghdr.msg_name = sq;
|
|
|
|
msghdr.msg_namelen = sizeof(*sq);
|
|
|
|
}
|
|
|
|
|
|
|
|
mutex_lock(&qmi->sock_lock);
|
|
|
|
if (qmi->sock) {
|
|
|
|
ret = kernel_sendmsg(qmi->sock, &msghdr, &iv, 1, len);
|
|
|
|
if (ret < 0)
|
|
|
|
pr_err("failed to send QMI message\n");
|
|
|
|
} else {
|
|
|
|
ret = -EPIPE;
|
|
|
|
}
|
|
|
|
mutex_unlock(&qmi->sock_lock);
|
|
|
|
|
|
|
|
kfree(msg);
|
|
|
|
|
|
|
|
return ret < 0 ? ret : 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* qmi_send_request() - send a request QMI message
|
|
|
|
* @qmi: QMI client handle
|
|
|
|
* @sq: destination sockaddr
|
|
|
|
* @txn: transaction object to use for the message
|
|
|
|
* @msg_id: message id
|
|
|
|
* @len: max length of the QMI message
|
|
|
|
* @ei: QMI message description
|
|
|
|
* @c_struct: object to be encoded
|
|
|
|
*
|
|
|
|
* Return: 0 on success, negative errno on failure.
|
|
|
|
*/
|
|
|
|
ssize_t qmi_send_request(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
|
|
|
|
struct qmi_txn *txn, int msg_id, size_t len,
|
|
|
|
struct qmi_elem_info *ei, const void *c_struct)
|
|
|
|
{
|
|
|
|
return qmi_send_message(qmi, sq, txn, QMI_REQUEST, msg_id, len, ei,
|
|
|
|
c_struct);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(qmi_send_request);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* qmi_send_response() - send a response QMI message
|
|
|
|
* @qmi: QMI client handle
|
|
|
|
* @sq: destination sockaddr
|
|
|
|
* @txn: transaction object to use for the message
|
|
|
|
* @msg_id: message id
|
|
|
|
* @len: max length of the QMI message
|
|
|
|
* @ei: QMI message description
|
|
|
|
* @c_struct: object to be encoded
|
|
|
|
*
|
|
|
|
* Return: 0 on success, negative errno on failure.
|
|
|
|
*/
|
|
|
|
ssize_t qmi_send_response(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
|
|
|
|
struct qmi_txn *txn, int msg_id, size_t len,
|
|
|
|
struct qmi_elem_info *ei, const void *c_struct)
|
|
|
|
{
|
|
|
|
return qmi_send_message(qmi, sq, txn, QMI_RESPONSE, msg_id, len, ei,
|
|
|
|
c_struct);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(qmi_send_response);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* qmi_send_indication() - send an indication QMI message
|
|
|
|
* @qmi: QMI client handle
|
|
|
|
* @sq: destination sockaddr
|
|
|
|
* @msg_id: message id
|
|
|
|
* @len: max length of the QMI message
|
|
|
|
* @ei: QMI message description
|
|
|
|
* @c_struct: object to be encoded
|
|
|
|
*
|
|
|
|
* Return: 0 on success, negative errno on failure.
|
|
|
|
*/
|
|
|
|
ssize_t qmi_send_indication(struct qmi_handle *qmi, struct sockaddr_qrtr *sq,
|
|
|
|
int msg_id, size_t len, struct qmi_elem_info *ei,
|
|
|
|
const void *c_struct)
|
|
|
|
{
|
|
|
|
struct qmi_txn txn;
|
|
|
|
ssize_t rval;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = qmi_txn_init(qmi, &txn, NULL, NULL);
|
|
|
|
if (ret < 0)
|
|
|
|
return ret;
|
|
|
|
|
|
|
|
rval = qmi_send_message(qmi, sq, &txn, QMI_INDICATION, msg_id, len, ei,
|
|
|
|
c_struct);
|
|
|
|
|
|
|
|
/* We don't care about future messages on this txn */
|
|
|
|
qmi_txn_cancel(&txn);
|
|
|
|
|
|
|
|
return rval;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(qmi_send_indication);
|