[dc0a7df] | 1 | /** |
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| 2 | * @file |
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| 3 | * |
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| 4 | * @ingroup QorIQInterCom |
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| 5 | * |
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| 6 | * @brief Inter-Processor Communication implementation. |
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| 7 | */ |
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| 8 | |
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| 9 | /* |
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| 10 | * Copyright (c) 2011 embedded brains GmbH. All rights reserved. |
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| 11 | * |
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| 12 | * embedded brains GmbH |
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| 13 | * Obere Lagerstr. 30 |
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| 14 | * 82178 Puchheim |
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| 15 | * Germany |
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| 16 | * <rtems@embedded-brains.de> |
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| 17 | * |
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| 18 | * The license and distribution terms for this file may be |
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| 19 | * found in the file LICENSE in this distribution or at |
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[c499856] | 20 | * http://www.rtems.org/license/LICENSE. |
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[dc0a7df] | 21 | */ |
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| 22 | |
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| 23 | #include <assert.h> |
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| 24 | #include <string.h> |
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| 25 | |
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| 26 | #include <rtems.h> |
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| 27 | |
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| 28 | #include <libcpu/powerpc-utility.h> |
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| 29 | |
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| 30 | #include <bspopts.h> |
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| 31 | #include <bsp/irq.h> |
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| 32 | #include <bsp/qoriq.h> |
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| 33 | #include <bsp/intercom.h> |
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| 34 | |
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[0df59b7c] | 35 | #ifdef RTEMS_MULTIPROCESSING |
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| 36 | |
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[dc0a7df] | 37 | #define INTERCOM_EVENT_IPI RTEMS_EVENT_13 |
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| 38 | #define INTERCOM_EVENT_WAKE_UP RTEMS_EVENT_14 |
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| 39 | |
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| 40 | #define PACKET_SIZE_COUNT 4 |
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| 41 | |
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| 42 | #define ONE_CORE(core) (1U << (core)) |
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| 43 | #define ALL_CORES ((1U << INTERCOM_CORE_COUNT) - 1U) |
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| 44 | #define OTHER_CORES(core) (ALL_CORES & ~ONE_CORE(core)) |
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| 45 | |
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| 46 | #define IPI_INDEX 0 |
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| 47 | |
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| 48 | typedef struct consumer { |
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| 49 | struct consumer *next; |
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| 50 | rtems_id task; |
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| 51 | } consumer; |
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| 52 | |
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| 53 | typedef struct { |
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| 54 | consumer *head; |
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| 55 | uint32_t cache_line_alignment [7]; |
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| 56 | } consumer_list; |
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| 57 | |
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| 58 | typedef struct { |
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| 59 | uint32_t lock; |
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| 60 | intercom_packet *head; |
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| 61 | size_t size; |
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| 62 | uint32_t cores_to_notify; |
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| 63 | uint32_t cache_line_alignment [4]; |
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| 64 | consumer_list waiting_consumers [INTERCOM_CORE_COUNT]; |
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| 65 | } free_list; |
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| 66 | |
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| 67 | typedef struct { |
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| 68 | uint32_t lock; |
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| 69 | intercom_packet *head; |
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| 70 | intercom_packet *tail; |
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| 71 | uint32_t cache_line_alignment [5]; |
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| 72 | } core_fifo; |
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| 73 | |
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| 74 | typedef struct { |
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| 75 | free_list free_lists [PACKET_SIZE_COUNT]; |
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| 76 | core_fifo core_fifos [INTERCOM_CORE_COUNT]; |
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| 77 | intercom_service services [INTERCOM_CORE_COUNT][INTERCOM_SERVICE_COUNT]; |
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| 78 | void *service_args [INTERCOM_CORE_COUNT][INTERCOM_SERVICE_COUNT]; |
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| 79 | uint32_t ready_lock; |
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| 80 | uint32_t ready; |
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| 81 | uint32_t cache_line_alignment [6]; |
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| 82 | } control; |
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| 83 | |
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| 84 | static control *const intercom = (control *) QORIQ_INTERCOM_AREA_BEGIN; |
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| 85 | |
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| 86 | static const size_t packet_sizes [PACKET_SIZE_COUNT] = { |
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| 87 | 64, |
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| 88 | 512, |
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| 89 | 2048, |
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| 90 | 4096 |
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| 91 | }; |
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| 92 | |
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| 93 | static void send_event(rtems_id task, rtems_event_set event) |
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| 94 | { |
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| 95 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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| 96 | |
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| 97 | sc = rtems_event_send(task, event); |
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| 98 | assert(sc == RTEMS_SUCCESSFUL); |
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| 99 | } |
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| 100 | |
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| 101 | static void wait_for_event(rtems_event_set in) |
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| 102 | { |
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| 103 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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| 104 | rtems_event_set out; |
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| 105 | |
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| 106 | sc = rtems_event_receive( |
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| 107 | in, |
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| 108 | RTEMS_EVENT_ALL | RTEMS_WAIT, |
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| 109 | RTEMS_NO_TIMEOUT, |
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| 110 | &out |
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| 111 | ); |
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| 112 | assert(sc == RTEMS_SUCCESSFUL); |
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| 113 | } |
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| 114 | |
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| 115 | static void intercom_handler(void *arg) |
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| 116 | { |
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[43cc2b4] | 117 | rtems_id task = (rtems_id) (uintptr_t) arg; |
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[dc0a7df] | 118 | send_event(task, INTERCOM_EVENT_IPI); |
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| 119 | } |
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| 120 | |
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| 121 | static void notify_core_by_index(int core) |
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| 122 | { |
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| 123 | uint32_t self = ppc_processor_id(); |
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| 124 | qoriq.pic.per_cpu [self].ipidr [IPI_INDEX].reg = ONE_CORE(core); |
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| 125 | } |
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| 126 | |
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| 127 | static void notify_cores(uint32_t cores) |
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| 128 | { |
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| 129 | uint32_t self = ppc_processor_id(); |
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| 130 | qoriq.pic.per_cpu [self].ipidr [IPI_INDEX].reg = cores; |
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| 131 | } |
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| 132 | |
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| 133 | void qoriq_intercom_free_packet(intercom_packet *packet) |
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| 134 | { |
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| 135 | free_list *list = &intercom->free_lists [packet->size_index]; |
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| 136 | |
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| 137 | uint32_t msr = qoriq_spin_lock(&list->lock); |
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| 138 | intercom_packet *first = list->head; |
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| 139 | list->head = packet; |
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| 140 | packet->glue.next = first; |
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| 141 | uint32_t cores = list->cores_to_notify; |
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| 142 | if (cores != 0) { |
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| 143 | list->cores_to_notify = 0; |
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| 144 | notify_cores(cores); |
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| 145 | } |
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| 146 | qoriq_spin_unlock(&list->lock, msr); |
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| 147 | } |
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| 148 | |
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| 149 | static void default_service(intercom_packet *packet, void *arg) |
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| 150 | { |
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| 151 | qoriq_intercom_free_packet(packet); |
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| 152 | } |
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| 153 | |
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| 154 | static void process_free_lists(free_list *free_lists, uint32_t self) |
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| 155 | { |
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| 156 | int i = 0; |
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| 157 | |
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| 158 | for (i = 0; i < PACKET_SIZE_COUNT; ++i) { |
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| 159 | free_list *list = &free_lists [i]; |
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| 160 | |
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| 161 | uint32_t msr = qoriq_spin_lock(&list->lock); |
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| 162 | consumer *waiting_consumer = list->waiting_consumers [self].head; |
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| 163 | list->waiting_consumers [self].head = NULL; |
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| 164 | qoriq_spin_unlock(&list->lock, msr); |
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| 165 | |
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| 166 | while (waiting_consumer != NULL) { |
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| 167 | send_event(waiting_consumer->task, INTERCOM_EVENT_WAKE_UP); |
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| 168 | waiting_consumer = waiting_consumer->next; |
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| 169 | } |
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| 170 | } |
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| 171 | } |
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| 172 | |
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| 173 | static void process_core_fifo(core_fifo *fifo, intercom_service *services, void **service_args) |
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| 174 | { |
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| 175 | uint32_t msr = qoriq_spin_lock(&fifo->lock); |
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| 176 | intercom_packet *packet = fifo->head; |
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| 177 | fifo->head = NULL; |
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| 178 | qoriq_spin_unlock(&fifo->lock, msr); |
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| 179 | |
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| 180 | while (packet != NULL) { |
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| 181 | intercom_packet *current = packet; |
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| 182 | intercom_type type_index = current->type_index; |
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| 183 | packet = current->glue.next; |
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| 184 | (*services [type_index])(current, service_args [type_index]); |
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| 185 | } |
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| 186 | } |
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| 187 | |
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| 188 | static void intercom_task(rtems_task_argument arg) |
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| 189 | { |
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| 190 | uint32_t self = ppc_processor_id(); |
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| 191 | free_list *free_lists = &intercom->free_lists [0]; |
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| 192 | intercom_service *services = &intercom->services [self][0]; |
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| 193 | void **service_args = &intercom->service_args [self][0]; |
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| 194 | core_fifo *fifo = &intercom->core_fifos [self]; |
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| 195 | |
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| 196 | while (true) { |
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| 197 | process_free_lists(free_lists, self); |
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| 198 | process_core_fifo(fifo, services, service_args); |
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| 199 | wait_for_event(INTERCOM_EVENT_IPI); |
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| 200 | } |
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| 201 | } |
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| 202 | |
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| 203 | static intercom_packet *free_list_and_packet_init( |
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| 204 | free_list *list, |
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| 205 | size_t count, |
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| 206 | intercom_packet *current, |
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| 207 | intercom_size size_index, |
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| 208 | size_t size |
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| 209 | ) |
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| 210 | { |
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| 211 | intercom_packet *last = current; |
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| 212 | size_t inc = 1 + size / sizeof(*current); |
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| 213 | size_t i = 0; |
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| 214 | |
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| 215 | assert(count > 0); |
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| 216 | assert(size % sizeof(*current) == 0); |
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| 217 | |
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| 218 | list->size = size; |
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| 219 | list->head = current; |
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| 220 | for (i = 0; i < count; ++i) { |
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| 221 | intercom_packet *next = current + inc; |
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| 222 | current->glue.next = next; |
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| 223 | current->size_index = size_index; |
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| 224 | last = current; |
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| 225 | current = next; |
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| 226 | } |
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| 227 | last->glue.next = NULL; |
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| 228 | |
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| 229 | return current; |
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| 230 | } |
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| 231 | |
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| 232 | static void basic_init(void) |
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| 233 | { |
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| 234 | char *begin = (char *) QORIQ_INTERCOM_AREA_BEGIN; |
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| 235 | size_t size = QORIQ_INTERCOM_AREA_SIZE; |
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| 236 | int i = 0; |
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| 237 | |
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| 238 | memset(begin, 0, size); |
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| 239 | |
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| 240 | assert(size % packet_sizes [PACKET_SIZE_COUNT - 1] == 0); |
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| 241 | |
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| 242 | /* Calculate data area sizes */ |
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| 243 | size_t data_sizes [PACKET_SIZE_COUNT]; |
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| 244 | data_sizes [PACKET_SIZE_COUNT - 1] = size / 2; |
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| 245 | for (i = PACKET_SIZE_COUNT - 2; i > 0; --i) { |
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| 246 | data_sizes [i] = data_sizes [i + 1] / 2; |
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| 247 | } |
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| 248 | data_sizes [i] = data_sizes [i + 1]; |
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| 249 | |
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| 250 | /* Calculate packet counts */ |
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| 251 | size_t packet_counts [PACKET_SIZE_COUNT]; |
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| 252 | size_t count = 0; |
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| 253 | for (i = 1; i < PACKET_SIZE_COUNT; ++i) { |
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| 254 | packet_counts [i] = data_sizes [i] / packet_sizes [i]; |
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| 255 | count += packet_counts [i]; |
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| 256 | } |
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| 257 | packet_counts [0] = (data_sizes [0] - sizeof(control) - count * sizeof(intercom_packet)) |
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| 258 | / (sizeof(intercom_packet) + packet_sizes [0]); |
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| 259 | |
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| 260 | /* Initialize free lists and packets */ |
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| 261 | intercom_packet *packet = (intercom_packet *) (begin + sizeof(control)); |
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| 262 | for (i = 0; i < PACKET_SIZE_COUNT; ++i) { |
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| 263 | packet = free_list_and_packet_init( |
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| 264 | &intercom->free_lists [i], |
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| 265 | packet_counts [i], |
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| 266 | packet, |
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| 267 | i, |
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| 268 | packet_sizes [i] |
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| 269 | ); |
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| 270 | } |
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| 271 | |
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| 272 | rtems_cache_flush_multiple_data_lines(begin, size); |
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| 273 | ppc_synchronize_data(); |
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| 274 | } |
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| 275 | |
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| 276 | static void services_init(uint32_t self) |
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| 277 | { |
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| 278 | int i = 0; |
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| 279 | |
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| 280 | for (i = 0; i < INTERCOM_SERVICE_COUNT; ++i) { |
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| 281 | if (intercom->services [self][i] == NULL) { |
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| 282 | intercom->services [self][i] = default_service; |
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| 283 | } |
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| 284 | } |
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| 285 | } |
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| 286 | |
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| 287 | void qoriq_intercom_init(void) |
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| 288 | { |
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| 289 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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| 290 | rtems_id task = RTEMS_ID_NONE; |
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| 291 | uint32_t self = ppc_processor_id(); |
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| 292 | |
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| 293 | sc = rtems_task_create( |
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| 294 | rtems_build_name('I', 'C', 'O', 'M'), |
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| 295 | 10, |
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| 296 | 0, |
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| 297 | RTEMS_DEFAULT_MODES, |
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| 298 | RTEMS_DEFAULT_ATTRIBUTES, |
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| 299 | &task |
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| 300 | ); |
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| 301 | assert(sc == RTEMS_SUCCESSFUL); |
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| 302 | |
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| 303 | sc = qoriq_pic_set_priority( |
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| 304 | QORIQ_IRQ_IPI_0, |
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| 305 | QORIQ_PIC_PRIORITY_LOWEST, |
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| 306 | NULL |
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| 307 | ); |
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| 308 | assert(sc == RTEMS_SUCCESSFUL); |
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| 309 | |
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| 310 | sc = rtems_interrupt_handler_install( |
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| 311 | QORIQ_IRQ_IPI_0, |
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| 312 | "INTERCOM", |
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| 313 | RTEMS_INTERRUPT_UNIQUE, |
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| 314 | intercom_handler, |
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[43cc2b4] | 315 | (void *) (uintptr_t) task |
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[dc0a7df] | 316 | ); |
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| 317 | assert(sc == RTEMS_SUCCESSFUL); |
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| 318 | |
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| 319 | if (self == 0) { |
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| 320 | basic_init(); |
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| 321 | } |
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| 322 | |
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| 323 | services_init(self); |
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| 324 | |
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| 325 | sc = rtems_task_start(task, intercom_task, 0); |
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| 326 | assert(sc == RTEMS_SUCCESSFUL); |
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| 327 | } |
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| 328 | |
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| 329 | void qoriq_intercom_start(void) |
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| 330 | { |
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| 331 | uint32_t self = ppc_processor_id(); |
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| 332 | uint32_t ready = 0; |
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| 333 | |
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| 334 | while (ready != ALL_CORES) { |
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| 335 | uint32_t msr = qoriq_spin_lock(&intercom->ready_lock); |
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| 336 | ready = intercom->ready; |
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| 337 | intercom->ready = ready | ONE_CORE(self); |
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| 338 | qoriq_spin_unlock(&intercom->ready_lock, msr); |
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| 339 | } |
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| 340 | } |
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| 341 | |
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| 342 | static intercom_packet *allocate(intercom_type type, free_list *list) |
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| 343 | { |
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| 344 | uint32_t self = ppc_processor_id(); |
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| 345 | intercom_packet *packet = NULL; |
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| 346 | consumer poor = { |
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| 347 | .task = rtems_task_self() |
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| 348 | }; |
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| 349 | |
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| 350 | while (packet == NULL) { |
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| 351 | uint32_t msr = qoriq_spin_lock(&list->lock); |
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| 352 | packet = list->head; |
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| 353 | if (packet != NULL) { |
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| 354 | list->head = packet->glue.next; |
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| 355 | } else { |
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| 356 | consumer *first = list->waiting_consumers [self].head; |
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| 357 | list->waiting_consumers [self].head = &poor; |
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| 358 | poor.next = first; |
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| 359 | if (first == NULL) { |
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| 360 | list->cores_to_notify |= ONE_CORE(self); |
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| 361 | } |
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| 362 | } |
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| 363 | qoriq_spin_unlock(&list->lock, msr); |
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| 364 | |
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| 365 | if (packet == NULL) { |
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| 366 | wait_for_event(INTERCOM_EVENT_WAKE_UP); |
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| 367 | } |
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| 368 | } |
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| 369 | |
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| 370 | packet->glue.next = NULL; |
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| 371 | packet->type_index = type; |
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| 372 | packet->flags = 0; |
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| 373 | packet->size = list->size; |
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| 374 | |
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| 375 | return packet; |
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| 376 | } |
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| 377 | |
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| 378 | intercom_packet *qoriq_intercom_allocate_packet(intercom_type type, intercom_size size) |
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| 379 | { |
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| 380 | assert((unsigned) type < INTERCOM_SERVICE_COUNT); |
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| 381 | assert((unsigned) size < PACKET_SIZE_COUNT); |
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| 382 | |
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| 383 | return allocate(type, &intercom->free_lists [size]); |
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| 384 | } |
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| 385 | |
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| 386 | void qoriq_intercom_send_packets(int destination_core, intercom_packet *first, intercom_packet *last) |
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| 387 | { |
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| 388 | assert(destination_core >= 0); |
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| 389 | assert(destination_core < INTERCOM_CORE_COUNT); |
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| 390 | |
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| 391 | core_fifo *fifo = &intercom->core_fifos [destination_core]; |
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| 392 | |
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| 393 | uint32_t msr = qoriq_spin_lock(&fifo->lock); |
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| 394 | last->glue.next = NULL; |
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| 395 | if (fifo->head != NULL) { |
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| 396 | fifo->tail->glue.next = first; |
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| 397 | } else { |
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| 398 | fifo->head = first; |
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| 399 | notify_core_by_index(destination_core); |
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| 400 | } |
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| 401 | fifo->tail = last; |
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| 402 | qoriq_spin_unlock(&fifo->lock, msr); |
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| 403 | } |
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| 404 | |
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| 405 | void qoriq_intercom_broadcast_packets(intercom_packet *first, intercom_packet *last) |
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| 406 | { |
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| 407 | int i = 0; |
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| 408 | |
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| 409 | for (i = 1; i < INTERCOM_CORE_COUNT; ++i) { |
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| 410 | intercom_packet *clone_first = NULL; |
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| 411 | intercom_packet *clone_last = NULL; |
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| 412 | |
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| 413 | intercom_packet *current = first; |
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| 414 | while (current != NULL) { |
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| 415 | intercom_packet *clone = qoriq_intercom_clone_packet(current); |
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| 416 | if (clone_first == NULL) { |
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| 417 | clone_first = clone; |
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| 418 | } |
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| 419 | if (clone_last != NULL) { |
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| 420 | clone_last->glue.next = clone; |
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| 421 | } |
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| 422 | clone_last = clone; |
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| 423 | current = current->glue.next; |
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| 424 | } |
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| 425 | |
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| 426 | qoriq_intercom_send_packets(i, clone_first, clone_last); |
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| 427 | } |
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| 428 | |
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| 429 | qoriq_intercom_send_packets(0, first, last); |
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| 430 | } |
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| 431 | |
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| 432 | void qoriq_intercom_send(int destination_core, intercom_type type, intercom_size size, const void *buf, size_t n) |
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| 433 | { |
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| 434 | assert((unsigned) size < PACKET_SIZE_COUNT); |
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| 435 | |
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| 436 | size_t remaining = n; |
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| 437 | size_t packet_size = packet_sizes [size]; |
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| 438 | const char *src = buf; |
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| 439 | intercom_packet *first = NULL; |
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| 440 | intercom_packet *last = NULL; |
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| 441 | |
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| 442 | do { |
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| 443 | intercom_packet *packet = qoriq_intercom_allocate_packet( |
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| 444 | type, |
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| 445 | size |
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| 446 | ); |
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| 447 | if (first == NULL) { |
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| 448 | first = packet; |
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| 449 | } |
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| 450 | if (last != NULL) { |
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| 451 | last->glue.next = packet; |
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| 452 | } |
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| 453 | last = packet; |
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| 454 | size_t current_size = remaining < packet_size ? remaining : packet_size; |
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| 455 | remaining -= current_size; |
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| 456 | packet->size = current_size; |
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| 457 | const char *current = src; |
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| 458 | src += current_size; |
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| 459 | memcpy(packet->data, current, current_size); |
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| 460 | } while (remaining > 0); |
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| 461 | |
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| 462 | qoriq_intercom_send_packets(destination_core, first, last); |
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| 463 | } |
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| 464 | |
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| 465 | void qoriq_intercom_service_install(intercom_type type, intercom_service service, void *arg) |
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| 466 | { |
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| 467 | assert((unsigned) type < INTERCOM_SERVICE_COUNT); |
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| 468 | |
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| 469 | uint32_t self = ppc_processor_id(); |
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| 470 | intercom->service_args [self][type] = arg; |
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| 471 | ppc_enforce_in_order_execution_of_io(); |
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| 472 | intercom->services [self][type] = service; |
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| 473 | } |
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| 474 | |
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| 475 | void qoriq_intercom_service_remove(intercom_type type) |
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| 476 | { |
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| 477 | assert((unsigned) type < INTERCOM_SERVICE_COUNT); |
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| 478 | |
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| 479 | uint32_t self = ppc_processor_id(); |
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| 480 | intercom->services [self][type] = default_service; |
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| 481 | ppc_enforce_in_order_execution_of_io(); |
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| 482 | intercom->service_args [self][type] = NULL; |
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| 483 | } |
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| 484 | |
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| 485 | intercom_packet *qoriq_intercom_clone_packet(const intercom_packet *packet) |
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| 486 | { |
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| 487 | intercom_packet *clone = qoriq_intercom_allocate_packet( |
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| 488 | packet->type_index, |
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| 489 | packet->size_index |
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| 490 | ); |
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| 491 | |
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| 492 | clone->size = packet->size; |
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| 493 | memcpy(clone->data, packet->data, clone->size); |
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| 494 | |
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| 495 | return clone; |
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| 496 | } |
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[0df59b7c] | 497 | |
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| 498 | #endif /* RTEMS_MULTIPROCESSING */ |
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