1. enable will cause exception with list->head memory modify 2. gatt complete, timeout with HCI cmd timeout will cause exception
606 lines
20 KiB
C
606 lines
20 KiB
C
/******************************************************************************
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*
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* Copyright (C) 2014 Google, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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******************************************************************************/
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#include <string.h>
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#include "bt.h"
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#include "bt_defs.h"
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#include "bt_trace.h"
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#include "hcidefs.h"
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#include "hcimsgs.h"
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#include "bt_vendor_lib.h"
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#include "hci_internals.h"
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#include "hci_hal.h"
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#include "hci_layer.h"
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#include "allocator.h"
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#include "packet_fragmenter.h"
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#include "buffer_allocator.h"
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#include "list.h"
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#include "alarm.h"
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#include "thread.h"
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typedef struct {
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uint16_t opcode;
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future_t *complete_future;
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command_complete_cb complete_callback;
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command_status_cb status_callback;
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void *context;
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uint32_t sent_time;
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BT_HDR *command;
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} waiting_command_t;
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typedef struct {
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bool timer_is_set;
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osi_alarm_t *command_response_timer;
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list_t *commands_pending_response;
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pthread_mutex_t commands_pending_response_lock;
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} command_waiting_response_t;
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typedef struct {
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int command_credits;
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fixed_queue_t *command_queue;
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fixed_queue_t *packet_queue;
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// The hand-off point for data going to a higher layer, set by the higher layer
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fixed_queue_t *upwards_data_queue;
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command_waiting_response_t cmd_waiting_q;
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/*
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non_repeating_timer_t *command_response_timer;
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list_t *commands_pending_response;
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pthread_mutex_t commands_pending_response_lock;
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*/
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} hci_host_env_t;
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// Using a define here, because it can be stringified for the property lookup
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static const uint32_t COMMAND_PENDING_TIMEOUT = 8000;
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// Our interface
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static bool interface_created;
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static hci_t interface;
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static hci_host_env_t hci_host_env;
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static xTaskHandle xHciHostTaskHandle;
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static xQueueHandle xHciHostQueue;
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static bool hci_host_startup_flag;
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// Modules we import and callbacks we export
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static const allocator_t *buffer_allocator;
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static const hci_hal_t *hal;
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static const hci_hal_callbacks_t hal_callbacks;
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static const packet_fragmenter_t *packet_fragmenter;
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static const packet_fragmenter_callbacks_t packet_fragmenter_callbacks;
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static int hci_layer_init_env(void);
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static void hci_layer_deinit_env(void);
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static void hci_host_thread_handler(void *arg);
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static void event_command_ready(fixed_queue_t *queue);
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static void event_packet_ready(fixed_queue_t *queue);
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static void restart_comamnd_waiting_response_timer(
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command_waiting_response_t *cmd_wait_q,
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bool tigger_by_sending_command);
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static void command_timed_out(void *context);
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static void hal_says_packet_ready(BT_HDR *packet);
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static bool filter_incoming_event(BT_HDR *packet);
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static serial_data_type_t event_to_data_type(uint16_t event);
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static waiting_command_t *get_waiting_command(command_opcode_t opcode);
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static void dispatch_reassembled(BT_HDR *packet);
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// Module lifecycle functions
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int hci_start_up(void)
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{
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if (hci_layer_init_env()) {
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goto error;
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}
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xHciHostQueue = xQueueCreate(HCI_HOST_QUEUE_NUM, sizeof(BtTaskEvt_t));
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xTaskCreate(hci_host_thread_handler, HCI_HOST_TASK_NAME, HCI_HOST_TASK_STACK_SIZE, NULL, HCI_HOST_TASK_PRIO, &xHciHostTaskHandle);
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packet_fragmenter->init(&packet_fragmenter_callbacks);
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hal->open(&hal_callbacks);
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hci_host_startup_flag = true;
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return 0;
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error:
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hci_shut_down();
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return -1;
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}
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void hci_shut_down(void)
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{
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hci_host_startup_flag = false;
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hci_layer_deinit_env();
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packet_fragmenter->cleanup();
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//low_power_manager->cleanup();
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hal->close();
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vTaskDelete(xHciHostTaskHandle);
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vQueueDelete(xHciHostQueue);
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}
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void hci_host_task_post(void)
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{
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BtTaskEvt_t evt;
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if (hci_host_startup_flag == false) {
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return;
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}
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evt.sig = 0xff;
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evt.par = 0;
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if (xQueueSend(xHciHostQueue, &evt, 10 / portTICK_RATE_MS) != pdTRUE) {
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LOG_ERROR("xHciHostQueue failed\n");
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}
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}
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static int hci_layer_init_env(void)
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{
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command_waiting_response_t *cmd_wait_q;
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// The host is only allowed to send at most one command initially,
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// as per the Bluetooth spec, Volume 2, Part E, 4.4 (Command Flow Control)
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// This value can change when you get a command complete or command status event.
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hci_host_env.command_credits = 1;
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hci_host_env.command_queue = fixed_queue_new(SIZE_MAX);
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if (hci_host_env.command_queue) {
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fixed_queue_register_dequeue(hci_host_env.command_queue, event_command_ready);
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} else {
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LOG_ERROR("%s unable to create pending command queue.", __func__);
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return -1;
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}
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hci_host_env.packet_queue = fixed_queue_new(SIZE_MAX);
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if (hci_host_env.packet_queue) {
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fixed_queue_register_dequeue(hci_host_env.packet_queue, event_packet_ready);
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} else {
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LOG_ERROR("%s unable to create pending packet queue.", __func__);
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return -1;
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}
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// Init Commands waiting response list and timer
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cmd_wait_q = &hci_host_env.cmd_waiting_q;
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cmd_wait_q->timer_is_set = false;
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cmd_wait_q->commands_pending_response = list_new(NULL);
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if (!cmd_wait_q->commands_pending_response) {
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LOG_ERROR("%s unable to create list for commands pending response.", __func__);
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return -1;
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}
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pthread_mutex_init(&cmd_wait_q->commands_pending_response_lock, NULL);
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cmd_wait_q->command_response_timer = osi_alarm_new("cmd_rsp_to", command_timed_out, cmd_wait_q, COMMAND_PENDING_TIMEOUT);
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if (!cmd_wait_q->command_response_timer) {
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LOG_ERROR("%s unable to create command response timer.", __func__);
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return -1;
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}
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return 0;
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}
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static void hci_layer_deinit_env(void)
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{
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command_waiting_response_t *cmd_wait_q;
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if (hci_host_env.command_queue) {
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fixed_queue_free(hci_host_env.command_queue, allocator_calloc.free);
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}
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if (hci_host_env.packet_queue) {
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fixed_queue_free(hci_host_env.packet_queue, buffer_allocator->free);
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}
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cmd_wait_q = &hci_host_env.cmd_waiting_q;
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list_free(cmd_wait_q->commands_pending_response);
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pthread_mutex_destroy(&cmd_wait_q->commands_pending_response_lock);
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osi_alarm_free(cmd_wait_q->command_response_timer);
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cmd_wait_q->command_response_timer = NULL;
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}
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static void hci_host_thread_handler(void *arg)
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{
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/*
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* Previous task handles RX queue and two TX Queues, Since there is
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* a RX Thread Task in H4 layer which receives packet from driver layer.
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* Now HCI Host Task has been optimized to only process TX Queue
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* including command and data queue. And command queue has high priority,
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* All packets will be directly copied to single queue in driver layer with
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* H4 type header added (1 byte).
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*/
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BtTaskEvt_t e;
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for (;;) {
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if (pdTRUE == xQueueReceive(xHciHostQueue, &e, (portTickType)portMAX_DELAY)) {
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if (e.sig == 0xff) {
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if (API_vhci_host_check_send_available()) {
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/*Now Target only allowed one packet per TX*/
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BT_HDR *pkt = packet_fragmenter->fragment_current_packet();
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if (pkt != NULL) {
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packet_fragmenter->fragment_and_dispatch(pkt);
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} else {
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if (!fixed_queue_is_empty(hci_host_env.command_queue) &&
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hci_host_env.command_credits > 0) {
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fixed_queue_process(hci_host_env.command_queue);
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} else if (!fixed_queue_is_empty(hci_host_env.packet_queue)) {
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fixed_queue_process(hci_host_env.packet_queue);
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}
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}
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}
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}
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}
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}
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}
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static void set_data_queue(fixed_queue_t *queue)
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{
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hci_host_env.upwards_data_queue = queue;
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}
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static void transmit_command(
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BT_HDR *command,
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command_complete_cb complete_callback,
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command_status_cb status_callback,
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void *context)
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{
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uint8_t *stream;
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waiting_command_t *wait_entry = osi_calloc(sizeof(waiting_command_t));
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if (!wait_entry) {
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LOG_ERROR("%s couldn't allocate space for wait entry.", __func__);
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return;
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}
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stream = command->data + command->offset;
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STREAM_TO_UINT16(wait_entry->opcode, stream);
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wait_entry->complete_callback = complete_callback;
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wait_entry->status_callback = status_callback;
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wait_entry->command = command;
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wait_entry->context = context;
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// Store the command message type in the event field
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// in case the upper layer didn't already
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command->event = MSG_STACK_TO_HC_HCI_CMD;
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LOG_DEBUG("HCI Enqueue Comamnd opcode=0x%x\n", wait_entry->opcode);
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BTTRC_DUMP_BUFFER(NULL, command->data + command->offset, command->len);
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fixed_queue_enqueue(hci_host_env.command_queue, wait_entry);
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hci_host_task_post();
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}
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static future_t *transmit_command_futured(BT_HDR *command)
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{
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waiting_command_t *wait_entry = osi_calloc(sizeof(waiting_command_t));
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assert(wait_entry != NULL);
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future_t *future = future_new();
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uint8_t *stream = command->data + command->offset;
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STREAM_TO_UINT16(wait_entry->opcode, stream);
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wait_entry->complete_future = future;
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wait_entry->command = command;
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// Store the command message type in the event field
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// in case the upper layer didn't already
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command->event = MSG_STACK_TO_HC_HCI_CMD;
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fixed_queue_enqueue(hci_host_env.command_queue, wait_entry);
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hci_host_task_post();
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return future;
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}
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static void transmit_downward(uint16_t type, void *data)
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{
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if (type == MSG_STACK_TO_HC_HCI_CMD) {
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transmit_command((BT_HDR *)data, NULL, NULL, NULL);
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LOG_WARN("%s legacy transmit of command. Use transmit_command instead.\n", __func__);
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} else {
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fixed_queue_enqueue(hci_host_env.packet_queue, data);
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}
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//ke_event_set(KE_EVENT_HCI_HOST_THREAD);
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hci_host_task_post();
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}
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// Command/packet transmitting functions
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static void event_command_ready(fixed_queue_t *queue)
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{
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waiting_command_t *wait_entry = NULL;
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command_waiting_response_t *cmd_wait_q = &hci_host_env.cmd_waiting_q;
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wait_entry = fixed_queue_dequeue(queue);
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hci_host_env.command_credits--;
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// Move it to the list of commands awaiting response
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pthread_mutex_lock(&cmd_wait_q->commands_pending_response_lock);
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list_append(cmd_wait_q->commands_pending_response, wait_entry);
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pthread_mutex_unlock(&cmd_wait_q->commands_pending_response_lock);
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// Send it off
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packet_fragmenter->fragment_and_dispatch(wait_entry->command);
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wait_entry->sent_time = osi_alarm_now();
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restart_comamnd_waiting_response_timer(cmd_wait_q, true);
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}
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static void event_packet_ready(fixed_queue_t *queue)
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{
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BT_HDR *packet = (BT_HDR *)fixed_queue_dequeue(queue);
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// The queue may be the command queue or the packet queue, we don't care
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packet_fragmenter->fragment_and_dispatch(packet);
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}
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// Callback for the fragmenter to send a fragment
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static void transmit_fragment(BT_HDR *packet, bool send_transmit_finished)
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{
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uint16_t event = packet->event & MSG_EVT_MASK;
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serial_data_type_t type = event_to_data_type(event);
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hal->transmit_data(type, packet->data + packet->offset, packet->len);
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if (event != MSG_STACK_TO_HC_HCI_CMD && send_transmit_finished) {
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buffer_allocator->free(packet);
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}
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}
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static void fragmenter_transmit_finished(BT_HDR *packet, bool all_fragments_sent)
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{
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if (all_fragments_sent) {
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buffer_allocator->free(packet);
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} else {
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// This is kind of a weird case, since we're dispatching a partially sent packet
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// up to a higher layer.
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// TODO(zachoverflow): rework upper layer so this isn't necessary.
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buffer_allocator->free(packet);
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//dispatch_reassembled(packet);
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//data_dispatcher_dispatch(interface.event_dispatcher, packet->event & MSG_EVT_MASK, packet);
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}
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}
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static void restart_comamnd_waiting_response_timer(
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command_waiting_response_t *cmd_wait_q,
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bool tigger_by_sending_command)
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{
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uint32_t timeout;
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waiting_command_t *wait_entry;
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if (!cmd_wait_q) {
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return;
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}
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if (cmd_wait_q->timer_is_set) {
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if (tigger_by_sending_command) {
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return;
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}
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//Cancel Previous command timeout timer setted when sending command
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osi_alarm_cancel(cmd_wait_q->command_response_timer);
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cmd_wait_q->timer_is_set = false;
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}
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pthread_mutex_lock(&cmd_wait_q->commands_pending_response_lock);
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wait_entry = (list_is_empty(cmd_wait_q->commands_pending_response) ?
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NULL : list_front(cmd_wait_q->commands_pending_response));
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pthread_mutex_unlock(&cmd_wait_q->commands_pending_response_lock);
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if (wait_entry == NULL) {
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return;
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}
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timeout = osi_alarm_time_diff(osi_alarm_now(), wait_entry->sent_time);
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timeout = osi_alarm_time_diff(COMMAND_PENDING_TIMEOUT, timeout);
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timeout = (timeout <= COMMAND_PENDING_TIMEOUT) ? timeout : COMMAND_PENDING_TIMEOUT;
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cmd_wait_q->timer_is_set = true;
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osi_alarm_set(cmd_wait_q->command_response_timer, timeout);
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}
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static void command_timed_out(void *context)
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{
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command_waiting_response_t *cmd_wait_q = (command_waiting_response_t *)context;
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waiting_command_t *wait_entry;
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pthread_mutex_lock(&cmd_wait_q->commands_pending_response_lock);
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wait_entry = (list_is_empty(cmd_wait_q->commands_pending_response) ?
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NULL : list_front(cmd_wait_q->commands_pending_response));
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pthread_mutex_unlock(&cmd_wait_q->commands_pending_response_lock);
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if (wait_entry == NULL) {
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LOG_ERROR("%s with no commands pending response", __func__);
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} else
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// We shouldn't try to recover the stack from this command timeout.
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// If it's caused by a software bug, fix it. If it's a hardware bug, fix it.
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{
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LOG_ERROR("%s hci layer timeout waiting for response to a command. opcode: 0x%x", __func__, wait_entry->opcode);
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}
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}
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// Event/packet receiving functions
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static void hal_says_packet_ready(BT_HDR *packet)
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{
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if (packet->event != MSG_HC_TO_STACK_HCI_EVT) {
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packet_fragmenter->reassemble_and_dispatch(packet);
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} else if (!filter_incoming_event(packet)) {
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dispatch_reassembled(packet);
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}
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}
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// Returns true if the event was intercepted and should not proceed to
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// higher layers. Also inspects an incoming event for interesting
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// information, like how many commands are now able to be sent.
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static bool filter_incoming_event(BT_HDR *packet)
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{
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waiting_command_t *wait_entry = NULL;
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uint8_t *stream = packet->data + packet->offset;
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uint8_t event_code;
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command_opcode_t opcode;
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STREAM_TO_UINT8(event_code, stream);
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STREAM_SKIP_UINT8(stream); // Skip the parameter total length field
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LOG_DEBUG("Receive packet event_code=0x%x\n", event_code);
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if (event_code == HCI_COMMAND_COMPLETE_EVT) {
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STREAM_TO_UINT8(hci_host_env.command_credits, stream);
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STREAM_TO_UINT16(opcode, stream);
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wait_entry = get_waiting_command(opcode);
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if (!wait_entry) {
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LOG_WARN("%s command complete event with no matching command. opcode: 0x%x.", __func__, opcode);
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} else if (wait_entry->complete_callback) {
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wait_entry->complete_callback(packet, wait_entry->context);
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} else if (wait_entry->complete_future) {
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future_ready(wait_entry->complete_future, packet);
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}
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goto intercepted;
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} else if (event_code == HCI_COMMAND_STATUS_EVT) {
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uint8_t status;
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STREAM_TO_UINT8(status, stream);
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STREAM_TO_UINT8(hci_host_env.command_credits, stream);
|
|
STREAM_TO_UINT16(opcode, stream);
|
|
|
|
// If a command generates a command status event, it won't be getting a command complete event
|
|
|
|
wait_entry = get_waiting_command(opcode);
|
|
if (!wait_entry) {
|
|
LOG_WARN("%s command status event with no matching command. opcode: 0x%x", __func__, opcode);
|
|
} else if (wait_entry->status_callback) {
|
|
wait_entry->status_callback(status, wait_entry->command, wait_entry->context);
|
|
}
|
|
|
|
goto intercepted;
|
|
}
|
|
|
|
return false;
|
|
intercepted:
|
|
restart_comamnd_waiting_response_timer(&hci_host_env.cmd_waiting_q, false);
|
|
|
|
/*Tell HCI Host Task to continue TX Pending commands*/
|
|
if (hci_host_env.command_credits &&
|
|
!fixed_queue_is_empty(hci_host_env.command_queue)) {
|
|
hci_host_task_post();
|
|
}
|
|
//ke_event_set(KE_EVENT_HCI_HOST_THREAD);
|
|
|
|
if (wait_entry) {
|
|
// If it has a callback, it's responsible for freeing the packet
|
|
if (event_code == HCI_COMMAND_STATUS_EVT ||
|
|
(!wait_entry->complete_callback && !wait_entry->complete_future)) {
|
|
buffer_allocator->free(packet);
|
|
}
|
|
|
|
// If it has a callback, it's responsible for freeing the command
|
|
if (event_code == HCI_COMMAND_COMPLETE_EVT || !wait_entry->status_callback) {
|
|
buffer_allocator->free(wait_entry->command);
|
|
}
|
|
|
|
osi_free(wait_entry);
|
|
} else {
|
|
buffer_allocator->free(packet);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// Callback for the fragmenter to dispatch up a completely reassembled packet
|
|
static void dispatch_reassembled(BT_HDR *packet)
|
|
{
|
|
// Events should already have been dispatched before this point
|
|
|
|
if (hci_host_env.upwards_data_queue) {
|
|
fixed_queue_enqueue(hci_host_env.upwards_data_queue, packet);
|
|
btu_task_post(SIG_BTU_WORK);
|
|
//Tell Up-layer received packet.
|
|
} else {
|
|
LOG_DEBUG("%s had no queue to place upwards data packet in. Dropping it on the floor.", __func__);
|
|
buffer_allocator->free(packet);
|
|
}
|
|
}
|
|
|
|
// Misc internal functions
|
|
|
|
// TODO(zachoverflow): we seem to do this a couple places, like the HCI inject module. #centralize
|
|
static serial_data_type_t event_to_data_type(uint16_t event)
|
|
{
|
|
if (event == MSG_STACK_TO_HC_HCI_ACL) {
|
|
return DATA_TYPE_ACL;
|
|
} else if (event == MSG_STACK_TO_HC_HCI_SCO) {
|
|
return DATA_TYPE_SCO;
|
|
} else if (event == MSG_STACK_TO_HC_HCI_CMD) {
|
|
return DATA_TYPE_COMMAND;
|
|
} else {
|
|
LOG_ERROR("%s invalid event type, could not translate 0x%x\n", __func__, event);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static waiting_command_t *get_waiting_command(command_opcode_t opcode)
|
|
{
|
|
command_waiting_response_t *cmd_wait_q = &hci_host_env.cmd_waiting_q;
|
|
pthread_mutex_lock(&cmd_wait_q->commands_pending_response_lock);
|
|
|
|
for (const list_node_t *node = list_begin(cmd_wait_q->commands_pending_response);
|
|
node != list_end(cmd_wait_q->commands_pending_response);
|
|
node = list_next(node)) {
|
|
waiting_command_t *wait_entry = list_node(node);
|
|
if (!wait_entry || wait_entry->opcode != opcode) {
|
|
continue;
|
|
}
|
|
|
|
list_remove(cmd_wait_q->commands_pending_response, wait_entry);
|
|
|
|
pthread_mutex_unlock(&cmd_wait_q->commands_pending_response_lock);
|
|
return wait_entry;
|
|
}
|
|
|
|
pthread_mutex_unlock(&cmd_wait_q->commands_pending_response_lock);
|
|
return NULL;
|
|
}
|
|
|
|
static void init_layer_interface()
|
|
{
|
|
if (!interface_created) {
|
|
interface.set_data_queue = set_data_queue;
|
|
interface.transmit_command = transmit_command;
|
|
interface.transmit_command_futured = transmit_command_futured;
|
|
interface.transmit_downward = transmit_downward;
|
|
interface_created = true;
|
|
}
|
|
}
|
|
|
|
static const hci_hal_callbacks_t hal_callbacks = {
|
|
hal_says_packet_ready
|
|
};
|
|
|
|
static const packet_fragmenter_callbacks_t packet_fragmenter_callbacks = {
|
|
transmit_fragment,
|
|
dispatch_reassembled,
|
|
fragmenter_transmit_finished
|
|
};
|
|
|
|
const hci_t *hci_layer_get_interface()
|
|
{
|
|
buffer_allocator = buffer_allocator_get_interface();
|
|
hal = hci_hal_h4_get_interface();
|
|
packet_fragmenter = packet_fragmenter_get_interface();
|
|
|
|
init_layer_interface();
|
|
return &interface;
|
|
}
|
|
|