2017-08-27 22:51:38 -06:00
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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/firmware.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/slab.h>
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#include <linux/io.h>
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#include <linux/notifier.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/remoteproc/qcom_rproc.h>
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#include <linux/rpmsg.h>
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#include "qcom_common.h"
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static BLOCKING_NOTIFIER_HEAD(sysmon_notifiers);
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struct qcom_sysmon {
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struct rproc_subdev subdev;
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struct rproc *rproc;
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struct list_head node;
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const char *name;
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int ssctl_version;
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int ssctl_instance;
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struct notifier_block nb;
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struct device *dev;
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struct rpmsg_endpoint *ept;
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struct completion comp;
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struct mutex lock;
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bool ssr_ack;
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struct qmi_handle qmi;
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struct sockaddr_qrtr ssctl;
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};
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static DEFINE_MUTEX(sysmon_lock);
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static LIST_HEAD(sysmon_list);
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/**
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* sysmon_send_event() - send notification of other remote's SSR event
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* @sysmon: sysmon context
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* @name: other remote's name
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*/
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static void sysmon_send_event(struct qcom_sysmon *sysmon, const char *name)
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{
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char req[50];
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int len;
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int ret;
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len = snprintf(req, sizeof(req), "ssr:%s:before_shutdown", name);
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if (len >= sizeof(req))
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return;
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mutex_lock(&sysmon->lock);
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reinit_completion(&sysmon->comp);
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sysmon->ssr_ack = false;
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ret = rpmsg_send(sysmon->ept, req, len);
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if (ret < 0) {
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dev_err(sysmon->dev, "failed to send sysmon event\n");
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goto out_unlock;
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}
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ret = wait_for_completion_timeout(&sysmon->comp,
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msecs_to_jiffies(5000));
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if (!ret) {
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dev_err(sysmon->dev, "timeout waiting for sysmon ack\n");
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goto out_unlock;
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}
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if (!sysmon->ssr_ack)
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dev_err(sysmon->dev, "unexpected response to sysmon event\n");
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out_unlock:
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mutex_unlock(&sysmon->lock);
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}
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/**
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* sysmon_request_shutdown() - request graceful shutdown of remote
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* @sysmon: sysmon context
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*/
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static void sysmon_request_shutdown(struct qcom_sysmon *sysmon)
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{
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char *req = "ssr:shutdown";
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int ret;
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mutex_lock(&sysmon->lock);
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reinit_completion(&sysmon->comp);
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sysmon->ssr_ack = false;
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ret = rpmsg_send(sysmon->ept, req, strlen(req) + 1);
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if (ret < 0) {
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dev_err(sysmon->dev, "send sysmon shutdown request failed\n");
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goto out_unlock;
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}
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ret = wait_for_completion_timeout(&sysmon->comp,
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msecs_to_jiffies(5000));
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if (!ret) {
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dev_err(sysmon->dev, "timeout waiting for sysmon ack\n");
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goto out_unlock;
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}
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if (!sysmon->ssr_ack)
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dev_err(sysmon->dev,
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"unexpected response to sysmon shutdown request\n");
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out_unlock:
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mutex_unlock(&sysmon->lock);
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}
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static int sysmon_callback(struct rpmsg_device *rpdev, void *data, int count,
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void *priv, u32 addr)
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{
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struct qcom_sysmon *sysmon = priv;
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const char *ssr_ack = "ssr:ack";
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const int ssr_ack_len = strlen(ssr_ack) + 1;
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if (!sysmon)
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return -EINVAL;
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if (count >= ssr_ack_len && !memcmp(data, ssr_ack, ssr_ack_len))
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sysmon->ssr_ack = true;
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complete(&sysmon->comp);
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return 0;
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}
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#define SSCTL_SHUTDOWN_REQ 0x21
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#define SSCTL_SUBSYS_EVENT_REQ 0x23
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#define SSCTL_MAX_MSG_LEN 7
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#define SSCTL_SUBSYS_NAME_LENGTH 15
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enum {
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SSCTL_SSR_EVENT_BEFORE_POWERUP,
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SSCTL_SSR_EVENT_AFTER_POWERUP,
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SSCTL_SSR_EVENT_BEFORE_SHUTDOWN,
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SSCTL_SSR_EVENT_AFTER_SHUTDOWN,
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};
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enum {
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SSCTL_SSR_EVENT_FORCED,
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SSCTL_SSR_EVENT_GRACEFUL,
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};
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struct ssctl_shutdown_resp {
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struct qmi_response_type_v01 resp;
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};
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static struct qmi_elem_info ssctl_shutdown_resp_ei[] = {
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{
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.data_type = QMI_STRUCT,
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.elem_len = 1,
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.elem_size = sizeof(struct qmi_response_type_v01),
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.array_type = NO_ARRAY,
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.tlv_type = 0x02,
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.offset = offsetof(struct ssctl_shutdown_resp, resp),
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.ei_array = qmi_response_type_v01_ei,
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},
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{}
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};
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struct ssctl_subsys_event_req {
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u8 subsys_name_len;
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char subsys_name[SSCTL_SUBSYS_NAME_LENGTH];
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u32 event;
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u8 evt_driven_valid;
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u32 evt_driven;
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};
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static struct qmi_elem_info ssctl_subsys_event_req_ei[] = {
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{
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.data_type = QMI_DATA_LEN,
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.elem_len = 1,
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.elem_size = sizeof(uint8_t),
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.array_type = NO_ARRAY,
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.tlv_type = 0x01,
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.offset = offsetof(struct ssctl_subsys_event_req,
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subsys_name_len),
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.ei_array = NULL,
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},
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{
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.data_type = QMI_UNSIGNED_1_BYTE,
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.elem_len = SSCTL_SUBSYS_NAME_LENGTH,
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.elem_size = sizeof(char),
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.array_type = VAR_LEN_ARRAY,
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.tlv_type = 0x01,
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.offset = offsetof(struct ssctl_subsys_event_req,
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subsys_name),
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.ei_array = NULL,
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},
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{
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.data_type = QMI_SIGNED_4_BYTE_ENUM,
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.elem_len = 1,
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.elem_size = sizeof(uint32_t),
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.array_type = NO_ARRAY,
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.tlv_type = 0x02,
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.offset = offsetof(struct ssctl_subsys_event_req,
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event),
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.ei_array = NULL,
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},
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{
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.data_type = QMI_OPT_FLAG,
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.elem_len = 1,
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.elem_size = sizeof(uint8_t),
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.array_type = NO_ARRAY,
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.tlv_type = 0x10,
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.offset = offsetof(struct ssctl_subsys_event_req,
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evt_driven_valid),
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.ei_array = NULL,
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},
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{
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.data_type = QMI_SIGNED_4_BYTE_ENUM,
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.elem_len = 1,
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.elem_size = sizeof(uint32_t),
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.array_type = NO_ARRAY,
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.tlv_type = 0x10,
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.offset = offsetof(struct ssctl_subsys_event_req,
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evt_driven),
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.ei_array = NULL,
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},
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{}
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};
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struct ssctl_subsys_event_resp {
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struct qmi_response_type_v01 resp;
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};
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static struct qmi_elem_info ssctl_subsys_event_resp_ei[] = {
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{
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.data_type = QMI_STRUCT,
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.elem_len = 1,
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.elem_size = sizeof(struct qmi_response_type_v01),
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.array_type = NO_ARRAY,
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.tlv_type = 0x02,
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.offset = offsetof(struct ssctl_subsys_event_resp,
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resp),
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.ei_array = qmi_response_type_v01_ei,
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},
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{}
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};
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/**
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* ssctl_request_shutdown() - request shutdown via SSCTL QMI service
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* @sysmon: sysmon context
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*/
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static void ssctl_request_shutdown(struct qcom_sysmon *sysmon)
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{
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struct ssctl_shutdown_resp resp;
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struct qmi_txn txn;
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int ret;
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ret = qmi_txn_init(&sysmon->qmi, &txn, ssctl_shutdown_resp_ei, &resp);
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if (ret < 0) {
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dev_err(sysmon->dev, "failed to allocate QMI txn\n");
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return;
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}
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ret = qmi_send_request(&sysmon->qmi, &sysmon->ssctl, &txn,
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SSCTL_SHUTDOWN_REQ, 0, NULL, NULL);
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if (ret < 0) {
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dev_err(sysmon->dev, "failed to send shutdown request\n");
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qmi_txn_cancel(&txn);
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return;
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}
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ret = qmi_txn_wait(&txn, 5 * HZ);
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if (ret < 0)
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dev_err(sysmon->dev, "failed receiving QMI response\n");
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else if (resp.resp.result)
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dev_err(sysmon->dev, "shutdown request failed\n");
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else
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dev_dbg(sysmon->dev, "shutdown request completed\n");
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}
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/**
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* ssctl_send_event() - send notification of other remote's SSR event
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* @sysmon: sysmon context
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* @name: other remote's name
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*/
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static void ssctl_send_event(struct qcom_sysmon *sysmon, const char *name)
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{
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struct ssctl_subsys_event_resp resp;
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struct ssctl_subsys_event_req req;
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struct qmi_txn txn;
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int ret;
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memset(&resp, 0, sizeof(resp));
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ret = qmi_txn_init(&sysmon->qmi, &txn, ssctl_subsys_event_resp_ei, &resp);
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if (ret < 0) {
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dev_err(sysmon->dev, "failed to allocate QMI txn\n");
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return;
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}
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memset(&req, 0, sizeof(req));
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strlcpy(req.subsys_name, name, sizeof(req.subsys_name));
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req.subsys_name_len = strlen(req.subsys_name);
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req.event = SSCTL_SSR_EVENT_BEFORE_SHUTDOWN;
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req.evt_driven_valid = true;
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req.evt_driven = SSCTL_SSR_EVENT_FORCED;
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ret = qmi_send_request(&sysmon->qmi, &sysmon->ssctl, &txn,
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SSCTL_SUBSYS_EVENT_REQ, 40,
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ssctl_subsys_event_req_ei, &req);
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if (ret < 0) {
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dev_err(sysmon->dev, "failed to send shutdown request\n");
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qmi_txn_cancel(&txn);
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return;
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}
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ret = qmi_txn_wait(&txn, 5 * HZ);
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if (ret < 0)
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dev_err(sysmon->dev, "failed receiving QMI response\n");
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else if (resp.resp.result)
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dev_err(sysmon->dev, "ssr event send failed\n");
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else
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dev_dbg(sysmon->dev, "ssr event send completed\n");
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}
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/**
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* ssctl_new_server() - QMI callback indicating a new service
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* @qmi: QMI handle
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* @svc: service information
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*
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* Return: 0 if we're interested in this service, -EINVAL otherwise.
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*/
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static int ssctl_new_server(struct qmi_handle *qmi, struct qmi_service *svc)
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{
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struct qcom_sysmon *sysmon = container_of(qmi, struct qcom_sysmon, qmi);
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switch (svc->version) {
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case 1:
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if (svc->instance != 0)
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return -EINVAL;
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if (strcmp(sysmon->name, "modem"))
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return -EINVAL;
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break;
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case 2:
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if (svc->instance != sysmon->ssctl_instance)
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return -EINVAL;
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break;
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default:
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return -EINVAL;
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};
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sysmon->ssctl_version = svc->version;
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sysmon->ssctl.sq_family = AF_QIPCRTR;
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sysmon->ssctl.sq_node = svc->node;
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sysmon->ssctl.sq_port = svc->port;
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svc->priv = sysmon;
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return 0;
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}
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/**
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* ssctl_del_server() - QMI callback indicating that @svc is removed
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* @qmi: QMI handle
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* @svc: service information
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*/
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static void ssctl_del_server(struct qmi_handle *qmi, struct qmi_service *svc)
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{
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struct qcom_sysmon *sysmon = svc->priv;
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sysmon->ssctl_version = 0;
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}
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|
|
|
|
|
|
static const struct qmi_ops ssctl_ops = {
|
|
|
|
.new_server = ssctl_new_server,
|
|
|
|
.del_server = ssctl_del_server,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int sysmon_start(struct rproc_subdev *subdev)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void sysmon_stop(struct rproc_subdev *subdev, bool crashed)
|
|
|
|
{
|
|
|
|
struct qcom_sysmon *sysmon = container_of(subdev, struct qcom_sysmon, subdev);
|
|
|
|
|
|
|
|
blocking_notifier_call_chain(&sysmon_notifiers, 0, (void *)sysmon->name);
|
|
|
|
|
|
|
|
/* Don't request graceful shutdown if we've crashed */
|
|
|
|
if (crashed)
|
|
|
|
return;
|
|
|
|
|
|
|
|
if (sysmon->ssctl_version)
|
|
|
|
ssctl_request_shutdown(sysmon);
|
|
|
|
else if (sysmon->ept)
|
|
|
|
sysmon_request_shutdown(sysmon);
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sysmon_notify() - notify sysmon target of another's SSR
|
|
|
|
* @nb: notifier_block associated with sysmon instance
|
|
|
|
* @event: unused
|
|
|
|
* @data: SSR identifier of the remote that is going down
|
|
|
|
*/
|
|
|
|
static int sysmon_notify(struct notifier_block *nb, unsigned long event,
|
|
|
|
void *data)
|
|
|
|
{
|
|
|
|
struct qcom_sysmon *sysmon = container_of(nb, struct qcom_sysmon, nb);
|
|
|
|
struct rproc *rproc = sysmon->rproc;
|
|
|
|
const char *ssr_name = data;
|
|
|
|
|
|
|
|
/* Skip non-running rprocs and the originating instance */
|
|
|
|
if (rproc->state != RPROC_RUNNING || !strcmp(data, sysmon->name)) {
|
|
|
|
dev_dbg(sysmon->dev, "not notifying %s\n", sysmon->name);
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Only SSCTL version 2 supports SSR events */
|
|
|
|
if (sysmon->ssctl_version == 2)
|
|
|
|
ssctl_send_event(sysmon, ssr_name);
|
|
|
|
else if (sysmon->ept)
|
|
|
|
sysmon_send_event(sysmon, ssr_name);
|
|
|
|
|
|
|
|
return NOTIFY_DONE;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* qcom_add_sysmon_subdev() - create a sysmon subdev for the given remoteproc
|
|
|
|
* @rproc: rproc context to associate the subdev with
|
|
|
|
* @name: name of this subdev, to use in SSR
|
|
|
|
* @ssctl_instance: instance id of the ssctl QMI service
|
|
|
|
*
|
|
|
|
* Return: A new qcom_sysmon object, or NULL on failure
|
|
|
|
*/
|
|
|
|
struct qcom_sysmon *qcom_add_sysmon_subdev(struct rproc *rproc,
|
|
|
|
const char *name,
|
|
|
|
int ssctl_instance)
|
|
|
|
{
|
|
|
|
struct qcom_sysmon *sysmon;
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
sysmon = kzalloc(sizeof(*sysmon), GFP_KERNEL);
|
|
|
|
if (!sysmon)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
sysmon->dev = rproc->dev.parent;
|
|
|
|
sysmon->rproc = rproc;
|
|
|
|
|
|
|
|
sysmon->name = name;
|
|
|
|
sysmon->ssctl_instance = ssctl_instance;
|
|
|
|
|
|
|
|
init_completion(&sysmon->comp);
|
|
|
|
mutex_init(&sysmon->lock);
|
|
|
|
|
|
|
|
ret = qmi_handle_init(&sysmon->qmi, SSCTL_MAX_MSG_LEN, &ssctl_ops, NULL);
|
|
|
|
if (ret < 0) {
|
|
|
|
dev_err(sysmon->dev, "failed to initialize qmi handle\n");
|
|
|
|
kfree(sysmon);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
qmi_add_lookup(&sysmon->qmi, 43, 0, 0);
|
|
|
|
|
2018-06-26 06:11:57 -06:00
|
|
|
sysmon->subdev.start = sysmon_start;
|
|
|
|
sysmon->subdev.stop = sysmon_stop;
|
|
|
|
|
|
|
|
rproc_add_subdev(rproc, &sysmon->subdev);
|
2017-08-27 22:51:38 -06:00
|
|
|
|
|
|
|
sysmon->nb.notifier_call = sysmon_notify;
|
|
|
|
blocking_notifier_chain_register(&sysmon_notifiers, &sysmon->nb);
|
|
|
|
|
|
|
|
mutex_lock(&sysmon_lock);
|
|
|
|
list_add(&sysmon->node, &sysmon_list);
|
|
|
|
mutex_unlock(&sysmon_lock);
|
|
|
|
|
|
|
|
return sysmon;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(qcom_add_sysmon_subdev);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* qcom_remove_sysmon_subdev() - release a qcom_sysmon
|
|
|
|
* @sysmon: sysmon context, as retrieved by qcom_add_sysmon_subdev()
|
|
|
|
*/
|
|
|
|
void qcom_remove_sysmon_subdev(struct qcom_sysmon *sysmon)
|
|
|
|
{
|
|
|
|
if (!sysmon)
|
|
|
|
return;
|
|
|
|
|
|
|
|
mutex_lock(&sysmon_lock);
|
|
|
|
list_del(&sysmon->node);
|
|
|
|
mutex_unlock(&sysmon_lock);
|
|
|
|
|
|
|
|
blocking_notifier_chain_unregister(&sysmon_notifiers, &sysmon->nb);
|
|
|
|
|
|
|
|
rproc_remove_subdev(sysmon->rproc, &sysmon->subdev);
|
|
|
|
|
|
|
|
qmi_handle_release(&sysmon->qmi);
|
|
|
|
|
|
|
|
kfree(sysmon);
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(qcom_remove_sysmon_subdev);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sysmon_probe() - probe sys_mon channel
|
|
|
|
* @rpdev: rpmsg device handle
|
|
|
|
*
|
|
|
|
* Find the sysmon context associated with the ancestor remoteproc and assign
|
|
|
|
* this rpmsg device with said sysmon context.
|
|
|
|
*
|
|
|
|
* Return: 0 on success, negative errno on failure.
|
|
|
|
*/
|
|
|
|
static int sysmon_probe(struct rpmsg_device *rpdev)
|
|
|
|
{
|
|
|
|
struct qcom_sysmon *sysmon;
|
|
|
|
struct rproc *rproc;
|
|
|
|
|
|
|
|
rproc = rproc_get_by_child(&rpdev->dev);
|
|
|
|
if (!rproc) {
|
|
|
|
dev_err(&rpdev->dev, "sysmon device not child of rproc\n");
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
mutex_lock(&sysmon_lock);
|
|
|
|
list_for_each_entry(sysmon, &sysmon_list, node) {
|
|
|
|
if (sysmon->rproc == rproc)
|
|
|
|
goto found;
|
|
|
|
}
|
|
|
|
mutex_unlock(&sysmon_lock);
|
|
|
|
|
|
|
|
dev_err(&rpdev->dev, "no sysmon associated with parent rproc\n");
|
|
|
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
found:
|
|
|
|
mutex_unlock(&sysmon_lock);
|
|
|
|
|
|
|
|
rpdev->ept->priv = sysmon;
|
|
|
|
sysmon->ept = rpdev->ept;
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sysmon_remove() - sys_mon channel remove handler
|
|
|
|
* @rpdev: rpmsg device handle
|
|
|
|
*
|
|
|
|
* Disassociate the rpmsg device with the sysmon instance.
|
|
|
|
*/
|
|
|
|
static void sysmon_remove(struct rpmsg_device *rpdev)
|
|
|
|
{
|
|
|
|
struct qcom_sysmon *sysmon = rpdev->ept->priv;
|
|
|
|
|
|
|
|
sysmon->ept = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
static const struct rpmsg_device_id sysmon_match[] = {
|
|
|
|
{ "sys_mon" },
|
|
|
|
{}
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct rpmsg_driver sysmon_driver = {
|
|
|
|
.probe = sysmon_probe,
|
|
|
|
.remove = sysmon_remove,
|
|
|
|
.callback = sysmon_callback,
|
|
|
|
.id_table = sysmon_match,
|
|
|
|
.drv = {
|
|
|
|
.name = "qcom_sysmon",
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
module_rpmsg_driver(sysmon_driver);
|
|
|
|
|
|
|
|
MODULE_DESCRIPTION("Qualcomm sysmon driver");
|
|
|
|
MODULE_LICENSE("GPL v2");
|