| 1 | /* |
| 2 | * Copyright 2010-2017 Intel Corporation. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 11 | * General Public License for more details. |
| 12 | * |
| 13 | * Disclaimer: The codes contained in these modules may be specific to |
| 14 | * the Intel Software Development Platform codenamed Knights Ferry, |
| 15 | * and the Intel product codenamed Knights Corner, and are not backward |
| 16 | * compatible with other Intel products. Additionally, Intel will NOT |
| 17 | * support the codes or instruction set in future products. |
| 18 | * |
| 19 | * Intel offers no warranty of any kind regarding the code. This code is |
| 20 | * licensed on an "AS IS" basis and Intel is not obligated to provide |
| 21 | * any support, assistance, installation, training, or other services |
| 22 | * of any kind. Intel is also not obligated to provide any updates, |
| 23 | * enhancements or extensions. Intel specifically disclaims any warranty |
| 24 | * of merchantability, non-infringement, fitness for any particular |
| 25 | * purpose, and any other warranty. |
| 26 | * |
| 27 | * Further, Intel disclaims all liability of any kind, including but |
| 28 | * not limited to liability for infringement of any proprietary rights, |
| 29 | * relating to the use of the code, even if Intel is notified of the |
| 30 | * possibility of such liability. Except as expressly stated in an Intel |
| 31 | * license agreement provided with this code and agreed upon with Intel, |
| 32 | * no license, express or implied, by estoppel or otherwise, to any |
| 33 | * intellectual property rights is granted herein. |
| 34 | */ |
| 35 | |
| 36 | #include "mic_common.h" |
| 37 | #include "scif.h" |
| 38 | #include "mic/micscif.h" |
| 39 | #include "mic/mic_pm.h" |
| 40 | #include "mic/micveth.h" |
| 41 | |
| 42 | extern int set_host_state(mic_ctx_t *mic_ctx, PM_IDLE_STATE state); |
| 43 | extern int pc6_entry_start(mic_ctx_t *mic_ctx); |
| 44 | |
| 45 | /* Function that decrements the count of number of PM clients connected |
| 46 | * to the host. |
| 47 | */ |
| 48 | void |
| 49 | micpm_decrement_clients(void) |
| 50 | { |
| 51 | if(unlikely(atomic_dec_return(&mic_data.dd_pm.connected_clients) < 0)) { |
| 52 | PM_DEBUG("connected_clients is negative (%d)\n", |
| 53 | atomic_read(&mic_data.dd_pm.connected_clients)); |
| 54 | } |
| 55 | return; |
| 56 | } |
| 57 | |
| 58 | static char *pm_message_types[PM_MESSAGE_MAX+1] = {"PM_MESSAGE_PC3READY", |
| 59 | "PM_MESSAGE_OPEN", |
| 60 | "PM_MESSAGE_OPEN_ACK", |
| 61 | "PM_MESSAGE_CLOSE", |
| 62 | "PM_MESSAGE_CLOSE_ACK", |
| 63 | "PM_MESSAGE_TEST", |
| 64 | "PM_MESSAGE_MAX"}; |
| 65 | void |
| 66 | micpm_display_message(mic_ctx_t *mic_ctx, void *header, void *msg, const char* label) { |
| 67 | pm_msg_header *header_ref; |
| 68 | int msg_len; |
| 69 | int i=0; |
| 70 | char *payload; |
| 71 | scif_epd_t epd = mic_ctx->micpm_ctx.pm_epd; |
| 72 | header_ref = (pm_msg_header *)header; |
| 73 | msg_len = header_ref->len; |
| 74 | |
| 75 | if(!epd) |
| 76 | return; |
| 77 | |
| 78 | if(0 <= header_ref->opcode && header_ref->opcode < PM_MESSAGE_MAX) { |
| 79 | if(strcmp(label,"SENT")==0) { |
| 80 | printk("%s: Msg type %s, SrcNode:SrcPort %d:%d, DestNode:DestPort %d:%d", label, |
| 81 | pm_message_types[header_ref->opcode], epd->port.node, epd->port.port, |
| 82 | epd->peer.node, epd->peer.port); |
| 83 | } |
| 84 | else |
| 85 | printk("%s: Msg type %s, DestNode:DestPort %d:%d, SrcNode:SrcPort %d:%d", label, |
| 86 | pm_message_types[header_ref->opcode], epd->port.node, epd->port.port, |
| 87 | epd->peer.node, epd->peer.port); |
| 88 | } |
| 89 | |
| 90 | |
| 91 | if(msg != NULL) { |
| 92 | payload = (char *)msg; |
| 93 | printk(" Payload"); |
| 94 | for(i=0;i<msg_len;i++){ |
| 95 | printk("0x%02x:", payload[i]); |
| 96 | } |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | int micpm_update_pc6(mic_ctx_t *mic_ctx, bool set) |
| 101 | { |
| 102 | |
| 103 | int err = 0; |
| 104 | if (mic_ctx->micpm_ctx.pm_options.pc6_enabled) { |
| 105 | if (set && !mic_ctx->micpm_ctx.pc6_enabled) { |
| 106 | mic_ctx->micpm_ctx.pc6_enabled = set; |
| 107 | queue_delayed_work(mic_ctx->micpm_ctx.pc6_entry_wq, |
| 108 | &mic_ctx->micpm_ctx.pc6_entry_work, |
| 109 | mic_ctx->micpm_ctx.pc6_timeout*HZ); |
| 110 | } |
| 111 | if (set == false) { |
| 112 | mic_ctx->micpm_ctx.pc6_enabled = set; |
| 113 | micpm_get_reference(mic_ctx, true); |
| 114 | micpm_put_reference(mic_ctx); |
| 115 | } |
| 116 | } else { |
| 117 | if (set) |
| 118 | err = -EINVAL; |
| 119 | else |
| 120 | mic_ctx->micpm_ctx.pc6_enabled = set; |
| 121 | } |
| 122 | return err; |
| 123 | } |
| 124 | |
| 125 | int micpm_update_pc3(mic_ctx_t *mic_ctx, bool set) |
| 126 | { |
| 127 | int err = 0; |
| 128 | if (mic_ctx->micpm_ctx.pm_options.pc3_enabled) { |
| 129 | if (set) { |
| 130 | mic_ctx->micpm_ctx.pc3_enabled = set; |
| 131 | } else { |
| 132 | mic_ctx->micpm_ctx.pc3_enabled = set; |
| 133 | micpm_get_reference(mic_ctx, true); |
| 134 | micpm_put_reference(mic_ctx); |
| 135 | } |
| 136 | } else { |
| 137 | if (set) |
| 138 | err = -EINVAL; |
| 139 | else |
| 140 | mic_ctx->micpm_ctx.pc3_enabled = set; |
| 141 | } |
| 142 | return err; |
| 143 | } |
| 144 | |
| 145 | /* |
| 146 | * Wraper to scif_send that takes in the buffer to be sent |
| 147 | * as input. |
| 148 | */ |
| 149 | int |
| 150 | mic_pm_send(mic_ctx_t *mic_ctx, void *msg, uint32_t len) |
| 151 | { |
| 152 | int err; |
| 153 | scif_epd_t epd; |
| 154 | |
| 155 | if(mic_ctx == NULL) { |
| 156 | PM_DEBUG("Mic context not Initialized\n"); |
| 157 | return -EINVAL; |
| 158 | } |
| 159 | |
| 160 | if((msg == NULL) || (len == 0)) { |
| 161 | PM_DEBUG("Invalid Parameters\n"); |
| 162 | return -EINVAL; |
| 163 | } |
| 164 | |
| 165 | epd = mic_ctx->micpm_ctx.pm_epd; |
| 166 | if(epd == NULL) { |
| 167 | PM_DEBUG("Scif Endpoint Undefined\n"); |
| 168 | return -EINVAL; |
| 169 | } |
| 170 | |
| 171 | if ((mic_ctx->micpm_ctx.con_state != PM_CONNECTING) && |
| 172 | (mic_ctx->micpm_ctx.con_state != PM_CONNECTED)) { |
| 173 | PM_DEBUG("Endpoint not in connected state\n"); |
| 174 | return -EINVAL; |
| 175 | } |
| 176 | |
| 177 | err = scif_send(epd, msg, len, PM_SEND_MODE); |
| 178 | /*scif_send returns the number of bytes returned on success */ |
| 179 | if(err <= 0) { |
| 180 | PM_DEBUG("scif_send to node: %d port: %d failed with error %d\n", |
| 181 | epd->peer.node, epd->peer.port, err); |
| 182 | } else { |
| 183 | PM_DEBUG("Bytes sent = %d\n",err); |
| 184 | err = 0; |
| 185 | } |
| 186 | |
| 187 | return err; |
| 188 | } |
| 189 | |
| 190 | /* |
| 191 | * Wrapper to scif_recv. |
| 192 | */ |
| 193 | int |
| 194 | mic_pm_recv(mic_ctx_t *mic_ctx, void *msg, uint32_t len) |
| 195 | { |
| 196 | int err; |
| 197 | scif_epd_t epd; |
| 198 | |
| 199 | if(mic_ctx == NULL) { |
| 200 | PM_DEBUG("Mic context not Initialized\n"); |
| 201 | return -EINVAL; |
| 202 | } |
| 203 | |
| 204 | if((msg == NULL) || (len == 0)) { |
| 205 | PM_DEBUG("Invalid Parameters\n"); |
| 206 | return -EINVAL; |
| 207 | } |
| 208 | |
| 209 | epd = mic_ctx->micpm_ctx.pm_epd; |
| 210 | if(epd == NULL) { |
| 211 | PM_DEBUG("Scif Endpoint Undefined\n"); |
| 212 | return -EINVAL; |
| 213 | } |
| 214 | |
| 215 | if ((mic_ctx->micpm_ctx.con_state != PM_CONNECTING) && |
| 216 | (mic_ctx->micpm_ctx.con_state != PM_CONNECTED)) { |
| 217 | PM_DEBUG("Endpoint not in connected state\n"); |
| 218 | return -EINVAL; |
| 219 | } |
| 220 | |
| 221 | err = scif_recv(epd, msg, len, PM_RECV_MODE); |
| 222 | |
| 223 | if(err <= 0) { |
| 224 | pr_debug("scif_recv failed with error %d\n", err); |
| 225 | if(err == 0) { |
| 226 | /*0 bytes were sent */ |
| 227 | err = -ENXIO; |
| 228 | } |
| 229 | } else { |
| 230 | PM_DEBUG("Bytes received = %d\n",err); |
| 231 | err = 0; |
| 232 | } |
| 233 | return err; |
| 234 | } |
| 235 | |
| 236 | /* |
| 237 | * Function to send a Power Management message over scif. Gets the message type |
| 238 | * as input and builds a message header. It then creates a single message buffer |
| 239 | * with this header and body and sends it to the receiving node. |
| 240 | */ |
| 241 | int |
| 242 | mic_pm_send_msg(mic_ctx_t *mic_ctx, PM_MESSAGE type, void *msg, uint32_t len) |
| 243 | { |
| 244 | pm_msg_header header; |
| 245 | char *send_msg = NULL; |
| 246 | int err = 0; |
| 247 | |
| 248 | header.opcode = type; |
| 249 | header.len = len; |
| 250 | |
| 251 | send_msg = kmalloc(len + sizeof(pm_msg_header), GFP_KERNEL); |
| 252 | if(send_msg == NULL) { |
| 253 | PM_DEBUG("error allocating memory"); |
| 254 | err = -ENOMEM; |
| 255 | return err; |
| 256 | } |
| 257 | memcpy(send_msg , &header, sizeof(pm_msg_header)); |
| 258 | if((len != 0) && (msg != NULL)) { |
| 259 | memcpy((send_msg + sizeof(pm_msg_header)), msg, len); |
| 260 | } |
| 261 | |
| 262 | if(mic_data.dd_pm.enable_pm_logging) { |
| 263 | if((len != 0) && (msg != NULL)) |
| 264 | micpm_display_message(mic_ctx,send_msg,send_msg+sizeof(pm_msg_header),"SENT"); |
| 265 | else |
| 266 | micpm_display_message(mic_ctx,send_msg,NULL,"SENT"); |
| 267 | } |
| 268 | err = mic_pm_send(mic_ctx, send_msg, len + sizeof(pm_msg_header)); |
| 269 | kfree(send_msg); |
| 270 | return err; |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | * Handler invoked when receiving a PC3 ready message. |
| 275 | */ |
| 276 | int |
| 277 | handle_pc3_ready(mic_ctx_t *mic_ctx) |
| 278 | { |
| 279 | int err = 0; |
| 280 | PM_ENTRY; |
| 281 | err = pm_pc3_entry(mic_ctx); |
| 282 | PM_EXIT; |
| 283 | return err; |
| 284 | } |
| 285 | |
| 286 | /* |
| 287 | * Handler invoked when receiving the latency response message |
| 288 | */ |
| 289 | int |
| 290 | handle_open_ack(mic_ctx_t *mic_ctx, pm_msg_pm_options *msg) |
| 291 | { |
| 292 | int err = 0; |
| 293 | PM_ENTRY; |
| 294 | |
| 295 | if ((mic_ctx == NULL) || (msg == NULL)) { |
| 296 | err = EINVAL; |
| 297 | goto inval; |
| 298 | } |
| 299 | |
| 300 | if ((msg->version.major_version != PM_MAJOR_VERSION) || |
| 301 | (msg->version.minor_version != PM_MINOR_VERSION)) { |
| 302 | printk(KERN_ERR "PM Driver version mismatch. " |
| 303 | "Expected version: %d.%d Received version %d.%d\n", |
| 304 | PM_MAJOR_VERSION, PM_MINOR_VERSION, |
| 305 | msg->version.major_version, msg->version.minor_version); |
| 306 | schedule_work(&mic_ctx->micpm_ctx.pm_close); |
| 307 | goto inval; |
| 308 | } |
| 309 | |
| 310 | mic_ctx->micpm_ctx.pm_options.pc3_enabled = msg->pc3_enabled; |
| 311 | mic_ctx->micpm_ctx.pm_options.pc6_enabled = msg->pc6_enabled; |
| 312 | |
| 313 | mic_ctx->micpm_ctx.pc3_enabled = |
| 314 | (mic_ctx->micpm_ctx.pm_options.pc3_enabled)? true : false; |
| 315 | mic_ctx->micpm_ctx.pc6_enabled = |
| 316 | (mic_ctx->micpm_ctx.pm_options.pc6_enabled)? true : false; |
| 317 | |
| 318 | mic_ctx->micpm_ctx.con_state = PM_CONNECTED; |
| 319 | |
| 320 | inval: |
| 321 | PM_EXIT; |
| 322 | return err; |
| 323 | } |
| 324 | |
| 325 | /* |
| 326 | * Message handler invoked by the per device receive workqueue when it receives |
| 327 | * a message from the device. |
| 328 | */ |
| 329 | int |
| 330 | mic_pm_handle_message(mic_ctx_t *mic_ctx, pm_recv_msg_t *recv_msg) |
| 331 | { |
| 332 | int res = 0; |
| 333 | |
| 334 | if(mic_ctx == NULL) { |
| 335 | return -EINVAL; |
| 336 | } |
| 337 | |
| 338 | if(recv_msg == NULL) { |
| 339 | PM_DEBUG("Undefined message\n"); |
| 340 | return -EINVAL; |
| 341 | } |
| 342 | |
| 343 | switch(recv_msg->msg_header.opcode) { |
| 344 | case PM_MESSAGE_PC3READY: |
| 345 | res = handle_pc3_ready(mic_ctx); |
| 346 | break; |
| 347 | case PM_MESSAGE_OPEN_ACK: |
| 348 | /*Size of the payload needs to be equal to what the |
| 349 | * host is trying to cast it to |
| 350 | */ |
| 351 | if (sizeof(pm_msg_pm_options) != recv_msg->msg_header.len) { |
| 352 | printk(KERN_ERR "Incompatible PM message. Opcode = %d\n", |
| 353 | recv_msg->msg_header.opcode); |
| 354 | return -EINVAL; |
| 355 | } |
| 356 | res = handle_open_ack(mic_ctx, |
| 357 | ((pm_msg_pm_options *) recv_msg->msg_body)); |
| 358 | break; |
| 359 | default: |
| 360 | printk(KERN_ERR "Unknown PM message. Opcode = %d\n", |
| 361 | recv_msg->msg_header.opcode); |
| 362 | break; |
| 363 | } |
| 364 | return res; |
| 365 | } |
| 366 | |
| 367 | /* |
| 368 | * retrieve_msg: |
| 369 | * |
| 370 | * Retrieve message from the head of list. |
| 371 | * @mic_ctx: The device context |
| 372 | * Returns the retrieved message. |
| 373 | */ |
| 374 | pm_recv_msg_t * |
| 375 | pm_retrieve_msg(mic_ctx_t *mic_ctx) { |
| 376 | |
| 377 | pm_recv_msg_t *recv_msg = NULL; |
| 378 | struct list_head *pos, *tmpq; |
| 379 | bool msg_found = false; |
| 380 | |
| 381 | mutex_lock(&mic_ctx->micpm_ctx.msg_mutex); |
| 382 | if (!list_empty_careful(&mic_ctx->micpm_ctx.msg_list)) |
| 383 | { |
| 384 | list_for_each_safe(pos, tmpq, &mic_ctx->micpm_ctx.msg_list) { |
| 385 | recv_msg = list_entry(pos, pm_recv_msg_t, msg); |
| 386 | /*Do not touch the message if its a test message */ |
| 387 | if (recv_msg->msg_header.opcode != PM_MESSAGE_TEST) { |
| 388 | list_del(&recv_msg->msg); |
| 389 | msg_found = true; |
| 390 | break; |
| 391 | } |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | if (msg_found == false) |
| 396 | recv_msg = NULL; |
| 397 | |
| 398 | mutex_unlock(&mic_ctx->micpm_ctx.msg_mutex); |
| 399 | return recv_msg; |
| 400 | } |
| 401 | |
| 402 | /* |
| 403 | * pm_process_msg_list: |
| 404 | * |
| 405 | * Process the message list of a node and handle each message in the list. |
| 406 | * @mic_ctx[in]: The deive context whose message list is to be processed |
| 407 | * Returns: None |
| 408 | */ |
| 409 | void |
| 410 | pm_process_msg_list(mic_ctx_t *mic_ctx) { |
| 411 | |
| 412 | pm_recv_msg_t *process_msg = NULL; |
| 413 | int ret = 0; |
| 414 | |
| 415 | if(mic_ctx == NULL) { |
| 416 | PM_DEBUG("Cannot get device handle \n"); |
| 417 | return; |
| 418 | } |
| 419 | |
| 420 | while(!list_empty(&mic_ctx->micpm_ctx.msg_list)) { |
| 421 | process_msg = pm_retrieve_msg(mic_ctx); |
| 422 | if(!process_msg) { |
| 423 | PM_DEBUG("No Message to process.\n"); |
| 424 | return; |
| 425 | } |
| 426 | |
| 427 | ret = mic_pm_handle_message(mic_ctx, process_msg); |
| 428 | if(ret) { |
| 429 | PM_DEBUG("Power Management message not processed" |
| 430 | " successfully.\n"); |
| 431 | } |
| 432 | |
| 433 | if(process_msg->msg_body != NULL) { |
| 434 | kfree(process_msg->msg_body); |
| 435 | } |
| 436 | kfree(process_msg); |
| 437 | } |
| 438 | } |
| 439 | |
| 440 | /* |
| 441 | * Retrieves each message from the message list and calls the handler |
| 442 | * for the same. After the handler returns, the message is removed |
| 443 | * from the list and deleted. |
| 444 | */ |
| 445 | static void |
| 446 | mic_pm_msg_handle_work(struct work_struct *msg_handle_work) |
| 447 | { |
| 448 | pm_wq_t *pm_wq = container_of(msg_handle_work, pm_wq_t, work); |
| 449 | micpm_ctx_t *pm_ctx = container_of(pm_wq, micpm_ctx_t, handle_msg); |
| 450 | mic_ctx_t *mic_ctx = container_of(pm_ctx, mic_ctx_t, micpm_ctx); |
| 451 | pm_process_msg_list(mic_ctx); |
| 452 | return; |
| 453 | } |
| 454 | |
| 455 | static void |
| 456 | pc6_entry_work(struct work_struct *work) |
| 457 | { |
| 458 | int err; |
| 459 | micpm_ctx_t *pm_ctx = |
| 460 | container_of(to_delayed_work(work), |
| 461 | micpm_ctx_t, pc6_entry_work); |
| 462 | mic_ctx_t *mic_ctx = container_of(pm_ctx, mic_ctx_t, micpm_ctx); |
| 463 | |
| 464 | err = pc6_entry_start(mic_ctx); |
| 465 | if (err == -EAGAIN) |
| 466 | queue_delayed_work(mic_ctx->micpm_ctx.pc6_entry_wq, |
| 467 | &mic_ctx->micpm_ctx.pc6_entry_work, |
| 468 | mic_ctx->micpm_ctx.pc6_timeout*HZ); |
| 469 | return; |
| 470 | } |
| 471 | |
| 472 | /* |
| 473 | * Called when a device creates a PM connection to Host. There can be |
| 474 | * only one PM connection between Host and a device. The function checks |
| 475 | * for an existing connection and rejects this new request if present. |
| 476 | */ |
| 477 | static void |
| 478 | mic_pm_accept_work(struct work_struct *work) |
| 479 | { |
| 480 | scif_epd_t newepd; |
| 481 | struct scif_portID portID; |
| 482 | int err; |
| 483 | uint16_t i; |
| 484 | mic_ctx_t *mic_ctx; |
| 485 | mic_data_t *mic_data_p = &mic_data; |
| 486 | |
| 487 | PM_DEBUG("Accept thread waiting for new PM connections\n"); |
| 488 | err = scif_accept(mic_data.dd_pm.epd, &portID, &newepd, SCIF_ACCEPT_SYNC); |
| 489 | if (err == -EBUSY || err == -ENODEV) { |
| 490 | PM_DEBUG("scif_accept error %d\n", err); |
| 491 | goto continue_accepting; |
| 492 | } |
| 493 | else if (err < 0) { |
| 494 | PM_DEBUG("scif_accept failed with errno %d\n", err); |
| 495 | goto exit; |
| 496 | |
| 497 | } |
| 498 | PM_DEBUG("Connection request received. \n"); |
| 499 | |
| 500 | mutex_lock(&mic_data.dd_pm.pm_accept_mutex); |
| 501 | |
| 502 | if (newepd->peer.node == SCIF_HOST_NODE) { |
| 503 | /* Reject connection request from HOST itself */ |
| 504 | PM_DEBUG("PM: Peer node cannot be HOST. Peer Node = %d Peer Port = %d", |
| 505 | newepd->peer.node, newepd->peer.port); |
| 506 | scif_close(newepd); |
| 507 | mutex_unlock(&mic_data.dd_pm.pm_accept_mutex); |
| 508 | goto continue_accepting; |
| 509 | } |
| 510 | |
| 511 | /*Only one Power Management connection per node. */ |
| 512 | for (i = 0; i < mic_data_p->dd_numdevs; i++) { |
| 513 | mic_ctx = get_per_dev_ctx(i); |
| 514 | if (mic_ctx != NULL) { |
| 515 | if (mic_ctx->micpm_ctx.pm_epd != NULL) { |
| 516 | if (mic_ctx->micpm_ctx.pm_epd->peer.node == newepd->peer.node) { |
| 517 | PM_DEBUG("There is already Power Management connection" |
| 518 | " established from this node. Rejecting request.\n"); |
| 519 | PM_DEBUG("Peer Node = %d, Peer Port = %d\n", |
| 520 | mic_ctx->micpm_ctx.pm_epd->peer.node, |
| 521 | mic_ctx->micpm_ctx.pm_epd->peer.port); |
| 522 | scif_close(newepd); |
| 523 | mutex_unlock(&mic_data.dd_pm.pm_accept_mutex); |
| 524 | goto continue_accepting; |
| 525 | } |
| 526 | } |
| 527 | } |
| 528 | |
| 529 | } |
| 530 | mutex_unlock(&mic_data.dd_pm.pm_accept_mutex); |
| 531 | mic_ctx = get_per_dev_ctx(newepd->peer.node -1); |
| 532 | mic_ctx->micpm_ctx.pm_epd = newepd; |
| 533 | micpm_start(mic_ctx); |
| 534 | |
| 535 | |
| 536 | continue_accepting: |
| 537 | mutex_lock(&mic_data.dd_pm.pm_accept_mutex); |
| 538 | queue_work(mic_data.dd_pm.accept.wq, |
| 539 | &mic_data.dd_pm.accept.work); |
| 540 | mutex_unlock(&mic_data.dd_pm.pm_accept_mutex); |
| 541 | exit: |
| 542 | return; |
| 543 | } |
| 544 | |
| 545 | /* |
| 546 | * Work item function that waits for incoming PM messages from |
| 547 | * a node. The function adds the message to a per device message |
| 548 | * list that is later processed by the message handler. |
| 549 | */ |
| 550 | static void |
| 551 | mic_pm_recv_work(struct work_struct *recv_work) |
| 552 | { |
| 553 | int err = 0; |
| 554 | int size = 0; |
| 555 | |
| 556 | pm_wq_t *pm_wq = container_of(recv_work, pm_wq_t, work); |
| 557 | micpm_ctx_t *pm_ctx = container_of(pm_wq, micpm_ctx_t, recv); |
| 558 | mic_ctx_t *mic_ctx = container_of(pm_ctx, mic_ctx_t, micpm_ctx); |
| 559 | pm_recv_msg_t *recv_msg = NULL; |
| 560 | |
| 561 | if (mic_ctx == NULL || pm_ctx == NULL) { |
| 562 | PM_DEBUG("Error retrieving driver context \n"); |
| 563 | goto unqueue; |
| 564 | } |
| 565 | |
| 566 | size = sizeof(pm_msg_header); |
| 567 | recv_msg = (void *)kmalloc(sizeof(pm_recv_msg_t), GFP_KERNEL); |
| 568 | |
| 569 | if (recv_msg == NULL) { |
| 570 | PM_DEBUG("Error allocating memory to save receive message.\n"); |
| 571 | goto unqueue; |
| 572 | } |
| 573 | INIT_LIST_HEAD(&recv_msg->msg); |
| 574 | recv_msg->msg_body = NULL; |
| 575 | |
| 576 | /*Get the header */ |
| 577 | err = mic_pm_recv(mic_ctx, &recv_msg->msg_header, size); |
| 578 | if (err < 0) { |
| 579 | PM_DEBUG("Error in scif_recv while waiting for PM header message.\n"); |
| 580 | if (err == -ECONNRESET) { |
| 581 | /*Remote node is not in a connected state. */ |
| 582 | schedule_work(&mic_ctx->micpm_ctx.pm_close); |
| 583 | } |
| 584 | goto unqueue; |
| 585 | |
| 586 | } |
| 587 | |
| 588 | if(recv_msg->msg_header.len != 0) { |
| 589 | PM_DEBUG("Retrieving %d bytes of message body\n", recv_msg->msg_header.len); |
| 590 | recv_msg->msg_body = (void *)kmalloc((sizeof(char) * recv_msg->msg_header.len), GFP_KERNEL); |
| 591 | if (recv_msg->msg_body == NULL) { |
| 592 | PM_DEBUG("Error allocating memory to receive PM Message\n"); |
| 593 | goto unqueue; |
| 594 | } |
| 595 | err = mic_pm_recv(mic_ctx, recv_msg->msg_body, recv_msg->msg_header.len); |
| 596 | if (err < 0) { |
| 597 | PM_DEBUG("Error in scif_recv while waiting for PM message body\n"); |
| 598 | if (err == -ECONNRESET) { |
| 599 | /*Remote node is not in a connected state. */ |
| 600 | schedule_work(&mic_ctx->micpm_ctx.pm_close); |
| 601 | } |
| 602 | goto unqueue; |
| 603 | } |
| 604 | } |
| 605 | |
| 606 | if(mic_data.dd_pm.enable_pm_logging) { |
| 607 | micpm_display_message(mic_ctx,&recv_msg->msg_header, |
| 608 | recv_msg->msg_body,"RECV"); |
| 609 | } |
| 610 | |
| 611 | if ((recv_msg->msg_header.opcode != PM_MESSAGE_CLOSE) && |
| 612 | ((recv_msg->msg_header.opcode != PM_MESSAGE_CLOSE_ACK))){ |
| 613 | PM_DEBUG("Adding received message from node %d to list.\n", |
| 614 | mic_ctx->bi_id+1); |
| 615 | mutex_lock(&mic_ctx->micpm_ctx.msg_mutex); |
| 616 | list_add_tail(&recv_msg->msg , &mic_ctx->micpm_ctx.msg_list); |
| 617 | mutex_unlock(&mic_ctx->micpm_ctx.msg_mutex); |
| 618 | |
| 619 | if(likely(recv_msg->msg_header.opcode != PM_MESSAGE_TEST)) { |
| 620 | PM_DEBUG("Queue message handler work for node: %d\n",mic_ctx->bi_id+1); |
| 621 | queue_work(mic_ctx->micpm_ctx.handle_msg.wq, |
| 622 | &mic_ctx->micpm_ctx.handle_msg.work); |
| 623 | } |
| 624 | |
| 625 | queue_work(mic_ctx->micpm_ctx.recv.wq, |
| 626 | &mic_ctx->micpm_ctx.recv.work); |
| 627 | } else { |
| 628 | |
| 629 | if (recv_msg->msg_header.opcode == PM_MESSAGE_CLOSE) { |
| 630 | mic_pm_send_msg(mic_ctx , PM_MESSAGE_CLOSE_ACK, NULL, 0); |
| 631 | mic_ctx->micpm_ctx.con_state = PM_DISCONNECTING; |
| 632 | schedule_work(&mic_ctx->micpm_ctx.pm_close); |
| 633 | } else { |
| 634 | mic_ctx->micpm_ctx.con_state = PM_DISCONNECTING; |
| 635 | wake_up(&mic_ctx->micpm_ctx.disc_wq); |
| 636 | } |
| 637 | goto unqueue; |
| 638 | } |
| 639 | return; |
| 640 | unqueue: |
| 641 | if (recv_msg) { |
| 642 | if (recv_msg->msg_body) |
| 643 | kfree(recv_msg->msg_body); |
| 644 | kfree(recv_msg); |
| 645 | } |
| 646 | return; |
| 647 | } |
| 648 | |
| 649 | /* |
| 650 | * Work item to handle closing of PM end point to a device and all the |
| 651 | * related receive workqueues. |
| 652 | */ |
| 653 | static void |
| 654 | mic_pm_close_work(struct work_struct *work) |
| 655 | { |
| 656 | micpm_ctx_t *pm_ctx = container_of(work, micpm_ctx_t, pm_close); |
| 657 | mic_ctx_t *mic_ctx = container_of(pm_ctx, mic_ctx_t, micpm_ctx); |
| 658 | micpm_stop(mic_ctx); |
| 659 | return; |
| 660 | } |
| 661 | |
| 662 | static void |
| 663 | mic_pm_resume_work(struct work_struct *resume_work) |
| 664 | { |
| 665 | int err; |
| 666 | pm_wq_t *pm_wq = container_of(resume_work, pm_wq_t, work); |
| 667 | micpm_ctx_t *pm_ctx = container_of(pm_wq, micpm_ctx_t, resume); |
| 668 | mic_ctx_t *mic_ctx = container_of(pm_ctx, mic_ctx_t, micpm_ctx); |
| 669 | |
| 670 | if (mic_ctx != NULL) { |
| 671 | err = pm_start_device(mic_ctx); |
| 672 | if (err) { |
| 673 | PM_DEBUG("Failed to start device %d after resume\n", |
| 674 | mic_ctx->bi_id); |
| 675 | } |
| 676 | } else { |
| 677 | PM_DEBUG("Error retrieving node context.\n"); |
| 678 | } |
| 679 | } |
| 680 | |
| 681 | /* Create PM specific workqueues during driver probe. |
| 682 | * |
| 683 | * Receive workqueue will store the received message and kick-off |
| 684 | * a message handler workqueue which will process them. |
| 685 | * |
| 686 | * Resume workqueue handles the task of booting uOS rduring |
| 687 | * OSPM resume/restore phase. |
| 688 | */ |
| 689 | int |
| 690 | setup_pm_workqueues(mic_ctx_t *mic_ctx) |
| 691 | { |
| 692 | int err = 0; |
| 693 | |
| 694 | if(!mic_ctx) { |
| 695 | PM_DEBUG("Failed to retrieve device context\n"); |
| 696 | err = -EINVAL; |
| 697 | goto err; |
| 698 | } |
| 699 | |
| 700 | /* setup resume wq */ |
| 701 | snprintf(mic_ctx->micpm_ctx.resume.wq_name, |
| 702 | sizeof(mic_ctx->micpm_ctx.resume.wq_name), |
| 703 | "PM_RESUME_WQ %d", mic_get_scifnode_id(mic_ctx)); |
| 704 | |
| 705 | if (!(mic_ctx->micpm_ctx.resume.wq |
| 706 | = __mic_create_singlethread_workqueue( |
| 707 | mic_ctx->micpm_ctx.resume.wq_name))) { |
| 708 | err = -ENOMEM; |
| 709 | goto err; |
| 710 | } |
| 711 | |
| 712 | /* Setup Receive wq */ |
| 713 | snprintf(mic_ctx->micpm_ctx.recv.wq_name, |
| 714 | sizeof(mic_ctx->micpm_ctx.recv.wq_name), |
| 715 | "RECV_WORK_Q %d", mic_get_scifnode_id(mic_ctx)); |
| 716 | |
| 717 | if (!(mic_ctx->micpm_ctx.recv.wq |
| 718 | = __mic_create_singlethread_workqueue( |
| 719 | mic_ctx->micpm_ctx.recv.wq_name))) { |
| 720 | err = -ENOMEM; |
| 721 | goto err; |
| 722 | } |
| 723 | |
| 724 | /* Setup Msg handler wq */ |
| 725 | snprintf(mic_ctx->micpm_ctx.handle_msg.wq_name, |
| 726 | sizeof(mic_ctx->micpm_ctx.handle_msg.wq_name), |
| 727 | "MSG_HANDLER_WQ %d", mic_get_scifnode_id(mic_ctx)); |
| 728 | |
| 729 | if (!(mic_ctx->micpm_ctx.handle_msg.wq |
| 730 | = __mic_create_singlethread_workqueue( |
| 731 | mic_ctx->micpm_ctx.handle_msg.wq_name))) { |
| 732 | err = -ENOMEM; |
| 733 | goto err; |
| 734 | } |
| 735 | |
| 736 | /* Setup pc6 entry wq */ |
| 737 | snprintf(mic_ctx->micpm_ctx.pc6_wq_name, |
| 738 | sizeof(mic_ctx->micpm_ctx.pc6_wq_name), |
| 739 | "PC6_WORK_Q %d", mic_get_scifnode_id(mic_ctx)); |
| 740 | |
| 741 | if (!(mic_ctx->micpm_ctx.pc6_entry_wq |
| 742 | = __mic_create_singlethread_workqueue( |
| 743 | mic_ctx->micpm_ctx.pc6_wq_name))) { |
| 744 | err = -ENOMEM; |
| 745 | goto err; |
| 746 | } |
| 747 | INIT_WORK(&mic_ctx->micpm_ctx.recv.work, mic_pm_recv_work); |
| 748 | INIT_WORK(&mic_ctx->micpm_ctx.handle_msg.work, mic_pm_msg_handle_work); |
| 749 | INIT_WORK(&mic_ctx->micpm_ctx.pm_close, mic_pm_close_work); |
| 750 | INIT_WORK(&mic_ctx->micpm_ctx.resume.work, mic_pm_resume_work); |
| 751 | INIT_DELAYED_WORK(&mic_ctx->micpm_ctx.pc6_entry_work, pc6_entry_work); |
| 752 | |
| 753 | err: |
| 754 | return err; |
| 755 | } |
| 756 | /*Power Management Initialization function. Sets up SCIF |
| 757 | * end points and accept threads. |
| 758 | */ |
| 759 | int micpm_init() |
| 760 | { |
| 761 | scif_epd_t epd; |
| 762 | int con_port; |
| 763 | int err = 0; |
| 764 | |
| 765 | epd = scif_open(); |
| 766 | if (epd == SCIF_OPEN_FAILED || epd == NULL) { |
| 767 | PM_DEBUG("scif_open failed\n"); |
| 768 | return -1; |
| 769 | } |
| 770 | |
| 771 | if ((con_port = scif_bind(epd, SCIF_PM_PORT_0)) < 0) { |
| 772 | PM_DEBUG("scif_bind to port failed with error %d\n", con_port); |
| 773 | err = con_port; |
| 774 | goto exit_close; |
| 775 | } |
| 776 | |
| 777 | /*No real upper limit on number of connections. |
| 778 | Once scif_listen accepts 0 as an acceptable parameter for max |
| 779 | connections(to mean tht there is no upper limit), change this. */ |
| 780 | if ((err = scif_listen(epd, 100)) < 0) { |
| 781 | PM_DEBUG("Listen ioctl failed with error %d\n", err); |
| 782 | goto exit_close; |
| 783 | } |
| 784 | mic_data.dd_pm.epd = epd; |
| 785 | |
| 786 | snprintf(mic_data.dd_pm.accept.wq_name, |
| 787 | sizeof(mic_data.dd_pm.accept.wq_name),"PM ACCEPT"); |
| 788 | |
| 789 | mic_data.dd_pm.accept.wq = |
| 790 | __mic_create_singlethread_workqueue(mic_data.dd_pm.accept.wq_name); |
| 791 | if (!mic_data.dd_pm.accept.wq){ |
| 792 | err = -ENOMEM; |
| 793 | PM_DEBUG("create workqueue returned null\n"); |
| 794 | goto exit_close; |
| 795 | } |
| 796 | INIT_WORK(&mic_data.dd_pm.accept.work, mic_pm_accept_work); |
| 797 | mutex_init (&mic_data.dd_pm.pm_accept_mutex); |
| 798 | mutex_init (&mic_data.dd_pm.pm_idle_mutex); |
| 799 | atomic_set(&mic_data.dd_pm.connected_clients, 0); |
| 800 | |
| 801 | /*Add work to the work queue */ |
| 802 | queue_work(mic_data.dd_pm.accept.wq, |
| 803 | &mic_data.dd_pm.accept.work); |
| 804 | mic_data.dd_pm.enable_pm_logging = 0; |
| 805 | atomic_set(&mic_data.dd_pm.wakeup_in_progress, 0); |
| 806 | |
| 807 | micpm_dbg_parent_init(); |
| 808 | |
| 809 | return err; |
| 810 | |
| 811 | exit_close: |
| 812 | scif_close(epd); |
| 813 | return err; |
| 814 | } |
| 815 | |
| 816 | /* |
| 817 | * Close the SCIF acceptor endpoint and uninit a lot of driver level |
| 818 | * data structures including accept threads, |
| 819 | */ |
| 820 | void |
| 821 | micpm_uninit(void) |
| 822 | { |
| 823 | int err; |
| 824 | scif_epd_t epd = mic_data.dd_pm.epd; |
| 825 | |
| 826 | if(atomic_read(&mic_data.dd_pm.connected_clients) > 0) { |
| 827 | PM_DEBUG("connected_clients is nonzero (%d)\n", |
| 828 | atomic_read(&mic_data.dd_pm.connected_clients)); |
| 829 | } |
| 830 | err = scif_close(epd); |
| 831 | if (err != 0) { |
| 832 | PM_DEBUG("Scif_close failed with error %d\n",err); |
| 833 | } |
| 834 | |
| 835 | if (mic_data.dd_pm.accept.wq != NULL) { |
| 836 | PM_DEBUG("Flushing accept workqueue\n"); |
| 837 | flush_workqueue(mic_data.dd_pm.accept.wq); |
| 838 | destroy_workqueue(mic_data.dd_pm.accept.wq); |
| 839 | mic_data.dd_pm.accept.wq = NULL; |
| 840 | } |
| 841 | |
| 842 | mutex_destroy(&mic_data.dd_pm.pm_accept_mutex); |
| 843 | mutex_destroy(&mic_data.dd_pm.pm_idle_mutex); |
| 844 | |
| 845 | debugfs_remove_recursive(mic_data.dd_pm.pmdbgparent_dir); |
| 846 | |
| 847 | } |
| 848 | |
| 849 | /* |
| 850 | * Open the Per device Power Management context. |
| 851 | */ |
| 852 | int |
| 853 | micpm_probe(mic_ctx_t * mic_ctx) { |
| 854 | |
| 855 | int err = 0; |
| 856 | |
| 857 | mic_ctx->micpm_ctx.pm_epd = NULL; |
| 858 | mic_ctx->micpm_ctx.idle_state = PM_IDLE_STATE_PC0; |
| 859 | mic_ctx->micpm_ctx.recv.wq = NULL; |
| 860 | mic_ctx->micpm_ctx.handle_msg.wq = NULL; |
| 861 | mic_ctx->micpm_ctx.mic_suspend_state = MIC_RESET; |
| 862 | mic_ctx->micpm_ctx.pc3_enabled = true; |
| 863 | mic_ctx->micpm_ctx.pc6_enabled = true; |
| 864 | mic_ctx->micpm_ctx.pm_options.pc3_enabled = 0; |
| 865 | mic_ctx->micpm_ctx.pm_options.pc6_enabled = 0; |
| 866 | |
| 867 | if ((err = setup_pm_workqueues(mic_ctx))) |
| 868 | goto err; |
| 869 | |
| 870 | mutex_init (&mic_ctx->micpm_ctx.msg_mutex); |
| 871 | INIT_LIST_HEAD(&mic_ctx->micpm_ctx.msg_list); |
| 872 | init_waitqueue_head(&mic_ctx->micpm_ctx.disc_wq); |
| 873 | atomic_set(&mic_ctx->micpm_ctx.pm_ref_cnt, 0); |
| 874 | mic_ctx->micpm_ctx.pc6_timeout = PC6_TIMER; |
| 875 | |
| 876 | /* create debugfs entries*/ |
| 877 | micpm_dbg_init(mic_ctx); |
| 878 | |
| 879 | err: |
| 880 | return err; |
| 881 | } |
| 882 | |
| 883 | int |
| 884 | micpm_remove(mic_ctx_t * mic_ctx) { |
| 885 | |
| 886 | debugfs_remove_recursive(mic_ctx->micpm_ctx.pmdbg_dir); |
| 887 | |
| 888 | if (mic_ctx->micpm_ctx.resume.wq != NULL) { |
| 889 | destroy_workqueue(mic_ctx->micpm_ctx.resume.wq); |
| 890 | mic_ctx->micpm_ctx.resume.wq = NULL; |
| 891 | } |
| 892 | |
| 893 | if(mic_ctx->micpm_ctx.pc6_entry_wq != NULL) { |
| 894 | destroy_workqueue(mic_ctx->micpm_ctx.pc6_entry_wq); |
| 895 | mic_ctx->micpm_ctx.pc6_entry_wq = NULL; |
| 896 | } |
| 897 | |
| 898 | if(mic_ctx->micpm_ctx.recv.wq != NULL) { |
| 899 | destroy_workqueue(mic_ctx->micpm_ctx.recv.wq); |
| 900 | mic_ctx->micpm_ctx.recv.wq = NULL; |
| 901 | } |
| 902 | |
| 903 | if(mic_ctx->micpm_ctx.handle_msg.wq != NULL) { |
| 904 | destroy_workqueue(mic_ctx->micpm_ctx.handle_msg.wq); |
| 905 | mic_ctx->micpm_ctx.handle_msg.wq = NULL; |
| 906 | } |
| 907 | |
| 908 | micpm_nodemask_uninit(mic_ctx); |
| 909 | |
| 910 | mutex_destroy(&mic_ctx->micpm_ctx.msg_mutex); |
| 911 | return 0; |
| 912 | } |
| 913 | |
| 914 | int |
| 915 | micpm_start(mic_ctx_t *mic_ctx) { |
| 916 | |
| 917 | int ref_cnt; |
| 918 | mic_ctx->micpm_ctx.con_state = PM_CONNECTING; |
| 919 | |
| 920 | /* queue receiver */ |
| 921 | queue_work(mic_ctx->micpm_ctx.recv.wq, |
| 922 | &mic_ctx->micpm_ctx.recv.work); |
| 923 | |
| 924 | atomic_inc(&mic_data.dd_pm.connected_clients); |
| 925 | if ((ref_cnt = atomic_read(&mic_ctx->micpm_ctx.pm_ref_cnt))) |
| 926 | printk("Warning: PM ref_cnt is non-zero during start. " |
| 927 | "ref_cnt = %d PM features may not work as expected\n", |
| 928 | ref_cnt); |
| 929 | mic_ctx->micpm_ctx.idle_state = PM_IDLE_STATE_PC0; |
| 930 | set_host_state(mic_ctx, PM_IDLE_STATE_PC0); |
| 931 | return mic_pm_send_msg(mic_ctx , PM_MESSAGE_OPEN, NULL, 0); |
| 932 | } |
| 933 | |
| 934 | /* |
| 935 | * Close the per device Power management context here. |
| 936 | * It does various things such as: closing scif endpoints, |
| 937 | * delete pending work items and wait for those that are |
| 938 | * executing to complete, delete pending messages in the |
| 939 | * message list, delete pending timers and wait for runnig |
| 940 | * timers to complete. The function can block. |
| 941 | */ |
| 942 | int |
| 943 | micpm_stop(mic_ctx_t *mic_ctx) { |
| 944 | |
| 945 | int err = 0; |
| 946 | int node_lost = 0; |
| 947 | if(mic_ctx == NULL) { |
| 948 | PM_DEBUG("Mic context not Initialized\n"); |
| 949 | return -EINVAL; |
| 950 | } |
| 951 | |
| 952 | if ((micpm_get_reference(mic_ctx, true))) { |
| 953 | PM_DEBUG("get_reference failed. Node may be lost\n"); |
| 954 | node_lost = 1; |
| 955 | } |
| 956 | |
| 957 | mutex_lock(&mic_data.dd_pm.pm_accept_mutex); |
| 958 | if ((mic_ctx->micpm_ctx.con_state == PM_CONNECTED) && |
| 959 | (mic_ctx->state != MIC_LOST)) { |
| 960 | if (!mic_pm_send_msg(mic_ctx, PM_MESSAGE_CLOSE, NULL, 0)) { |
| 961 | err = wait_event_timeout( |
| 962 | mic_ctx->micpm_ctx.disc_wq, |
| 963 | mic_ctx->micpm_ctx.con_state == PM_DISCONNECTING, |
| 964 | NODE_ALIVE_TIMEOUT); |
| 965 | if (!err) { |
| 966 | PM_DEBUG("Timed out waiting CLOSE ACK" |
| 967 | " from node.\n"); |
| 968 | } |
| 969 | } |
| 970 | } |
| 971 | |
| 972 | if(mic_ctx->micpm_ctx.pm_epd != NULL) { |
| 973 | PM_DEBUG("Power Management: Closing connection to" |
| 974 | " node: %d port:%d\n", mic_ctx->micpm_ctx.pm_epd->peer.node, |
| 975 | mic_ctx->micpm_ctx.pm_epd->peer.port); |
| 976 | err = scif_close(mic_ctx->micpm_ctx.pm_epd); |
| 977 | if(err!= 0) |
| 978 | PM_DEBUG("Scif_close failed with error %d\n",err); |
| 979 | mic_ctx->micpm_ctx.pm_epd = NULL; |
| 980 | micpm_decrement_clients(); |
| 981 | } |
| 982 | mic_ctx->micpm_ctx.con_state = PM_DISCONNECTED; |
| 983 | mic_ctx->micpm_ctx.idle_state = PM_IDLE_STATE_PC0; |
| 984 | flush_workqueue(mic_ctx->micpm_ctx.resume.wq); |
| 985 | flush_workqueue(mic_ctx->micpm_ctx.recv.wq); |
| 986 | flush_workqueue(mic_ctx->micpm_ctx.handle_msg.wq); |
| 987 | cancel_delayed_work_sync(&mic_ctx->micpm_ctx.pc6_entry_work); |
| 988 | |
| 989 | /* Process messages in message queue */ |
| 990 | pm_process_msg_list(mic_ctx); |
| 991 | |
| 992 | if (!node_lost) |
| 993 | micpm_put_reference(mic_ctx); |
| 994 | mutex_unlock(&mic_data.dd_pm.pm_accept_mutex); |
| 995 | return err; |
| 996 | } |
| 997 | |
| 998 | /* |
| 999 | * Function to load the uOS and start all the driver components |
| 1000 | * after a resume/restore operation |
| 1001 | */ |
| 1002 | int |
| 1003 | pm_start_device(mic_ctx_t *mic_ctx) |
| 1004 | { |
| 1005 | if (!mic_ctx) { |
| 1006 | PM_DEBUG("Error retreving driver context\n"); |
| 1007 | return 0; |
| 1008 | } |
| 1009 | |
| 1010 | PM_DEBUG("Resume MIC device:%d\n", mic_ctx->bi_id); |
| 1011 | /* Make sure the Power reset during Resume/Restore is complete*/ |
| 1012 | adapter_wait_reset(mic_ctx); |
| 1013 | wait_for_reset(mic_ctx); |
| 1014 | |
| 1015 | /*Perform software reset */ |
| 1016 | adapter_reset(mic_ctx, RESET_WAIT, !RESET_REATTEMPT); |
| 1017 | wait_for_reset(mic_ctx); |
| 1018 | |
| 1019 | /* Boot uOS only if it was online before suspend */ |
| 1020 | if (MIC_ONLINE == mic_ctx->micpm_ctx.mic_suspend_state) { |
| 1021 | if(adapter_start_device(mic_ctx)) { |
| 1022 | PM_DEBUG("booting uos... failed\n"); |
| 1023 | } |
| 1024 | } |
| 1025 | |
| 1026 | return 0; |
| 1027 | } |
| 1028 | |
| 1029 | /* |
| 1030 | * Function to stop all the driver components and unload the uOS |
| 1031 | * during a suspend/hibernate operation |
| 1032 | */ |
| 1033 | int |
| 1034 | pm_stop_device(mic_ctx_t *mic_ctx) |
| 1035 | { |
| 1036 | if (!mic_ctx) { |
| 1037 | PM_DEBUG("Error retreving driver context\n"); |
| 1038 | return 0; |
| 1039 | } |
| 1040 | |
| 1041 | mic_ctx->micpm_ctx.mic_suspend_state = mic_ctx->state; |
| 1042 | |
| 1043 | PM_DEBUG("Suspend MIC device:#%d\n", mic_ctx->bi_id); |
| 1044 | if (MIC_ONLINE == mic_ctx->micpm_ctx.mic_suspend_state) { |
| 1045 | adapter_shutdown_device(mic_ctx); |
| 1046 | if (!wait_for_shutdown_and_reset(mic_ctx)) { |
| 1047 | /* Shutdown failed. Fall back on forced reset */ |
| 1048 | adapter_stop_device(mic_ctx, RESET_WAIT, !RESET_REATTEMPT); |
| 1049 | wait_for_reset(mic_ctx); |
| 1050 | } |
| 1051 | } |
| 1052 | else { |
| 1053 | /* If card is in any state but ONLINE, make sure card stops */ |
| 1054 | adapter_stop_device(mic_ctx, RESET_WAIT, !RESET_REATTEMPT); |
| 1055 | wait_for_reset(mic_ctx); |
| 1056 | } |
| 1057 | |
| 1058 | mutex_lock(&mic_ctx->state_lock); |
| 1059 | mic_ctx->state = MIC_RESET; |
| 1060 | mutex_unlock(&mic_ctx->state_lock); |
| 1061 | return 0; |
| 1062 | } |