1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Xilinx Event Management Driver 4 * 5 * Copyright (C) 2021 Xilinx, Inc. 6 * Copyright (C) 2024 Advanced Micro Devices, Inc. 7 * 8 * Abhyuday Godhasara <abhyuday.godhasara@xilinx.com> 9 */ 10 11 #include <linux/cpuhotplug.h> 12 #include <linux/firmware/xlnx-event-manager.h> 13 #include <linux/firmware/xlnx-zynqmp.h> 14 #include <linux/hashtable.h> 15 #include <linux/interrupt.h> 16 #include <linux/irq.h> 17 #include <linux/irqdomain.h> 18 #include <linux/module.h> 19 #include <linux/of_irq.h> 20 #include <linux/platform_device.h> 21 #include <linux/slab.h> 22 23 static DEFINE_PER_CPU_READ_MOSTLY(int, dummy_cpu_number); 24 25 static int virq_sgi; 26 static int event_manager_availability = -EACCES; 27 28 /* SGI number used for Event management driver */ 29 #define XLNX_EVENT_SGI_NUM (15) 30 31 /* Max number of driver can register for same event */ 32 #define MAX_DRIVER_PER_EVENT (10U) 33 34 /* Max HashMap Order for PM API feature check (1<<7 = 128) */ 35 #define REGISTERED_DRIVER_MAX_ORDER (7) 36 37 #define MAX_BITS (32U) /* Number of bits available for error mask */ 38 39 #define FIRMWARE_VERSION_MASK (0xFFFFU) 40 #define REGISTER_NOTIFIER_FIRMWARE_VERSION (2U) 41 42 static DEFINE_HASHTABLE(reg_driver_map, REGISTERED_DRIVER_MAX_ORDER); 43 static int sgi_num = XLNX_EVENT_SGI_NUM; 44 45 static bool is_need_to_unregister; 46 47 /** 48 * struct agent_cb - Registered callback function and private data. 49 * @agent_data: Data passed back to handler function. 50 * @eve_cb: Function pointer to store the callback function. 51 * @list: member to create list. 52 */ 53 struct agent_cb { 54 void *agent_data; 55 event_cb_func_t eve_cb; 56 struct list_head list; 57 }; 58 59 /** 60 * struct registered_event_data - Registered Event Data. 61 * @key: key is the combine id(Node-Id | Event-Id) of type u64 62 * where upper u32 for Node-Id and lower u32 for Event-Id, 63 * And this used as key to index into hashmap. 64 * @cb_type: Type of Api callback, like PM_NOTIFY_CB, etc. 65 * @wake: If this flag set, firmware will wake up processor if is 66 * in sleep or power down state. 67 * @cb_list_head: Head of call back data list which contain the information 68 * about registered handler and private data. 69 * @hentry: hlist_node that hooks this entry into hashtable. 70 */ 71 struct registered_event_data { 72 u64 key; 73 enum pm_api_cb_id cb_type; 74 bool wake; 75 struct list_head cb_list_head; 76 struct hlist_node hentry; 77 }; 78 79 static bool xlnx_is_error_event(const u32 node_id) 80 { 81 if (node_id == EVENT_ERROR_PMC_ERR1 || 82 node_id == EVENT_ERROR_PMC_ERR2 || 83 node_id == EVENT_ERROR_PSM_ERR1 || 84 node_id == EVENT_ERROR_PSM_ERR2) 85 return true; 86 87 return false; 88 } 89 90 static int xlnx_add_cb_for_notify_event(const u32 node_id, const u32 event, const bool wake, 91 event_cb_func_t cb_fun, void *data) 92 { 93 u64 key = 0; 94 bool present_in_hash = false; 95 struct registered_event_data *eve_data; 96 struct agent_cb *cb_data; 97 struct agent_cb *cb_pos; 98 struct agent_cb *cb_next; 99 100 key = ((u64)node_id << 32U) | (u64)event; 101 /* Check for existing entry in hash table for given key id */ 102 hash_for_each_possible(reg_driver_map, eve_data, hentry, key) { 103 if (eve_data->key == key) { 104 present_in_hash = true; 105 break; 106 } 107 } 108 109 if (!present_in_hash) { 110 /* Add new entry if not present in HASH table */ 111 eve_data = kmalloc(sizeof(*eve_data), GFP_KERNEL); 112 if (!eve_data) 113 return -ENOMEM; 114 eve_data->key = key; 115 eve_data->cb_type = PM_NOTIFY_CB; 116 eve_data->wake = wake; 117 INIT_LIST_HEAD(&eve_data->cb_list_head); 118 119 cb_data = kmalloc(sizeof(*cb_data), GFP_KERNEL); 120 if (!cb_data) { 121 kfree(eve_data); 122 return -ENOMEM; 123 } 124 cb_data->eve_cb = cb_fun; 125 cb_data->agent_data = data; 126 127 /* Add into callback list */ 128 list_add(&cb_data->list, &eve_data->cb_list_head); 129 130 /* Add into HASH table */ 131 hash_add(reg_driver_map, &eve_data->hentry, key); 132 } else { 133 /* Search for callback function and private data in list */ 134 list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) { 135 if (cb_pos->eve_cb == cb_fun && 136 cb_pos->agent_data == data) { 137 return 0; 138 } 139 } 140 141 /* Add multiple handler and private data in list */ 142 cb_data = kmalloc(sizeof(*cb_data), GFP_KERNEL); 143 if (!cb_data) 144 return -ENOMEM; 145 cb_data->eve_cb = cb_fun; 146 cb_data->agent_data = data; 147 148 list_add(&cb_data->list, &eve_data->cb_list_head); 149 } 150 151 return 0; 152 } 153 154 static int xlnx_add_cb_for_suspend(event_cb_func_t cb_fun, void *data) 155 { 156 struct registered_event_data *eve_data; 157 struct agent_cb *cb_data; 158 159 /* Check for existing entry in hash table for given cb_type */ 160 hash_for_each_possible(reg_driver_map, eve_data, hentry, PM_INIT_SUSPEND_CB) { 161 if (eve_data->cb_type == PM_INIT_SUSPEND_CB) { 162 pr_err("Found as already registered\n"); 163 return -EINVAL; 164 } 165 } 166 167 /* Add new entry if not present */ 168 eve_data = kmalloc(sizeof(*eve_data), GFP_KERNEL); 169 if (!eve_data) 170 return -ENOMEM; 171 172 eve_data->key = 0; 173 eve_data->cb_type = PM_INIT_SUSPEND_CB; 174 INIT_LIST_HEAD(&eve_data->cb_list_head); 175 176 cb_data = kmalloc(sizeof(*cb_data), GFP_KERNEL); 177 if (!cb_data) 178 return -ENOMEM; 179 cb_data->eve_cb = cb_fun; 180 cb_data->agent_data = data; 181 182 /* Add into callback list */ 183 list_add(&cb_data->list, &eve_data->cb_list_head); 184 185 hash_add(reg_driver_map, &eve_data->hentry, PM_INIT_SUSPEND_CB); 186 187 return 0; 188 } 189 190 static int xlnx_remove_cb_for_suspend(event_cb_func_t cb_fun) 191 { 192 bool is_callback_found = false; 193 struct registered_event_data *eve_data; 194 struct agent_cb *cb_pos; 195 struct agent_cb *cb_next; 196 struct hlist_node *tmp; 197 198 is_need_to_unregister = false; 199 200 /* Check for existing entry in hash table for given cb_type */ 201 hash_for_each_possible_safe(reg_driver_map, eve_data, tmp, hentry, PM_INIT_SUSPEND_CB) { 202 if (eve_data->cb_type == PM_INIT_SUSPEND_CB) { 203 /* Delete the list of callback */ 204 list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) { 205 if (cb_pos->eve_cb == cb_fun) { 206 is_callback_found = true; 207 list_del_init(&cb_pos->list); 208 kfree(cb_pos); 209 } 210 } 211 /* remove an object from a hashtable */ 212 hash_del(&eve_data->hentry); 213 kfree(eve_data); 214 is_need_to_unregister = true; 215 } 216 } 217 if (!is_callback_found) { 218 pr_warn("Didn't find any registered callback for suspend event\n"); 219 return -EINVAL; 220 } 221 222 return 0; 223 } 224 225 static int xlnx_remove_cb_for_notify_event(const u32 node_id, const u32 event, 226 event_cb_func_t cb_fun, void *data) 227 { 228 bool is_callback_found = false; 229 struct registered_event_data *eve_data; 230 u64 key = ((u64)node_id << 32U) | (u64)event; 231 struct agent_cb *cb_pos; 232 struct agent_cb *cb_next; 233 struct hlist_node *tmp; 234 235 is_need_to_unregister = false; 236 237 /* Check for existing entry in hash table for given key id */ 238 hash_for_each_possible_safe(reg_driver_map, eve_data, tmp, hentry, key) { 239 if (eve_data->key == key) { 240 /* Delete the list of callback */ 241 list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) { 242 if (cb_pos->eve_cb == cb_fun && 243 cb_pos->agent_data == data) { 244 is_callback_found = true; 245 list_del_init(&cb_pos->list); 246 kfree(cb_pos); 247 } 248 } 249 250 /* Remove HASH table if callback list is empty */ 251 if (list_empty(&eve_data->cb_list_head)) { 252 /* remove an object from a HASH table */ 253 hash_del(&eve_data->hentry); 254 kfree(eve_data); 255 is_need_to_unregister = true; 256 } 257 } 258 } 259 if (!is_callback_found) { 260 pr_warn("Didn't find any registered callback for 0x%x 0x%x\n", 261 node_id, event); 262 return -EINVAL; 263 } 264 265 return 0; 266 } 267 268 /** 269 * xlnx_register_event() - Register for the event. 270 * @cb_type: Type of callback from pm_api_cb_id, 271 * PM_NOTIFY_CB - for Error Events, 272 * PM_INIT_SUSPEND_CB - for suspend callback. 273 * @node_id: Node-Id related to event. 274 * @event: Event Mask for the Error Event. 275 * @wake: Flag specifying whether the subsystem should be woken upon 276 * event notification. 277 * @cb_fun: Function pointer to store the callback function. 278 * @data: Pointer for the driver instance. 279 * 280 * Return: Returns 0 on successful registration else error code. 281 */ 282 int xlnx_register_event(const enum pm_api_cb_id cb_type, const u32 node_id, const u32 event, 283 const bool wake, event_cb_func_t cb_fun, void *data) 284 { 285 int ret = 0; 286 u32 eve; 287 int pos; 288 289 if (event_manager_availability) 290 return event_manager_availability; 291 292 if (cb_type != PM_NOTIFY_CB && cb_type != PM_INIT_SUSPEND_CB) { 293 pr_err("%s() Unsupported Callback 0x%x\n", __func__, cb_type); 294 return -EINVAL; 295 } 296 297 if (!cb_fun) 298 return -EFAULT; 299 300 if (cb_type == PM_INIT_SUSPEND_CB) { 301 ret = xlnx_add_cb_for_suspend(cb_fun, data); 302 } else { 303 if (!xlnx_is_error_event(node_id)) { 304 /* Add entry for Node-Id/Event in hash table */ 305 ret = xlnx_add_cb_for_notify_event(node_id, event, wake, cb_fun, data); 306 } else { 307 /* Add into Hash table */ 308 for (pos = 0; pos < MAX_BITS; pos++) { 309 eve = event & (1 << pos); 310 if (!eve) 311 continue; 312 313 /* Add entry for Node-Id/Eve in hash table */ 314 ret = xlnx_add_cb_for_notify_event(node_id, eve, wake, cb_fun, 315 data); 316 /* Break the loop if got error */ 317 if (ret) 318 break; 319 } 320 if (ret) { 321 /* Skip the Event for which got the error */ 322 pos--; 323 /* Remove registered(during this call) event from hash table */ 324 for ( ; pos >= 0; pos--) { 325 eve = event & (1 << pos); 326 if (!eve) 327 continue; 328 xlnx_remove_cb_for_notify_event(node_id, eve, cb_fun, data); 329 } 330 } 331 } 332 333 if (ret) { 334 pr_err("%s() failed for 0x%x and 0x%x: %d\r\n", __func__, node_id, 335 event, ret); 336 return ret; 337 } 338 339 /* Register for Node-Id/Event combination in firmware */ 340 ret = zynqmp_pm_register_notifier(node_id, event, wake, true); 341 if (ret) { 342 pr_err("%s() failed for 0x%x and 0x%x: %d\r\n", __func__, node_id, 343 event, ret); 344 /* Remove already registered event from hash table */ 345 if (xlnx_is_error_event(node_id)) { 346 for (pos = 0; pos < MAX_BITS; pos++) { 347 eve = event & (1 << pos); 348 if (!eve) 349 continue; 350 xlnx_remove_cb_for_notify_event(node_id, eve, cb_fun, data); 351 } 352 } else { 353 xlnx_remove_cb_for_notify_event(node_id, event, cb_fun, data); 354 } 355 return ret; 356 } 357 } 358 359 return ret; 360 } 361 EXPORT_SYMBOL_GPL(xlnx_register_event); 362 363 /** 364 * xlnx_unregister_event() - Unregister for the event. 365 * @cb_type: Type of callback from pm_api_cb_id, 366 * PM_NOTIFY_CB - for Error Events, 367 * PM_INIT_SUSPEND_CB - for suspend callback. 368 * @node_id: Node-Id related to event. 369 * @event: Event Mask for the Error Event. 370 * @cb_fun: Function pointer of callback function. 371 * @data: Pointer of agent's private data. 372 * 373 * Return: Returns 0 on successful unregistration else error code. 374 */ 375 int xlnx_unregister_event(const enum pm_api_cb_id cb_type, const u32 node_id, const u32 event, 376 event_cb_func_t cb_fun, void *data) 377 { 378 int ret = 0; 379 u32 eve, pos; 380 381 is_need_to_unregister = false; 382 383 if (event_manager_availability) 384 return event_manager_availability; 385 386 if (cb_type != PM_NOTIFY_CB && cb_type != PM_INIT_SUSPEND_CB) { 387 pr_err("%s() Unsupported Callback 0x%x\n", __func__, cb_type); 388 return -EINVAL; 389 } 390 391 if (!cb_fun) 392 return -EFAULT; 393 394 if (cb_type == PM_INIT_SUSPEND_CB) { 395 ret = xlnx_remove_cb_for_suspend(cb_fun); 396 } else { 397 /* Remove Node-Id/Event from hash table */ 398 if (!xlnx_is_error_event(node_id)) { 399 xlnx_remove_cb_for_notify_event(node_id, event, cb_fun, data); 400 } else { 401 for (pos = 0; pos < MAX_BITS; pos++) { 402 eve = event & (1 << pos); 403 if (!eve) 404 continue; 405 406 xlnx_remove_cb_for_notify_event(node_id, eve, cb_fun, data); 407 } 408 } 409 410 /* Un-register if list is empty */ 411 if (is_need_to_unregister) { 412 /* Un-register for Node-Id/Event combination */ 413 ret = zynqmp_pm_register_notifier(node_id, event, false, false); 414 if (ret) { 415 pr_err("%s() failed for 0x%x and 0x%x: %d\n", 416 __func__, node_id, event, ret); 417 return ret; 418 } 419 } 420 } 421 422 return ret; 423 } 424 EXPORT_SYMBOL_GPL(xlnx_unregister_event); 425 426 static void xlnx_call_suspend_cb_handler(const u32 *payload) 427 { 428 bool is_callback_found = false; 429 struct registered_event_data *eve_data; 430 u32 cb_type = payload[0]; 431 struct agent_cb *cb_pos; 432 struct agent_cb *cb_next; 433 434 /* Check for existing entry in hash table for given cb_type */ 435 hash_for_each_possible(reg_driver_map, eve_data, hentry, cb_type) { 436 if (eve_data->cb_type == cb_type) { 437 list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) { 438 cb_pos->eve_cb(&payload[0], cb_pos->agent_data); 439 is_callback_found = true; 440 } 441 } 442 } 443 if (!is_callback_found) 444 pr_warn("Didn't find any registered callback for suspend event\n"); 445 } 446 447 static void xlnx_call_notify_cb_handler(const u32 *payload) 448 { 449 bool is_callback_found = false; 450 struct registered_event_data *eve_data; 451 u64 key = ((u64)payload[1] << 32U) | (u64)payload[2]; 452 int ret; 453 struct agent_cb *cb_pos; 454 struct agent_cb *cb_next; 455 456 /* Check for existing entry in hash table for given key id */ 457 hash_for_each_possible(reg_driver_map, eve_data, hentry, key) { 458 if (eve_data->key == key) { 459 list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) { 460 cb_pos->eve_cb(&payload[0], cb_pos->agent_data); 461 is_callback_found = true; 462 } 463 464 /* re register with firmware to get future events */ 465 ret = zynqmp_pm_register_notifier(payload[1], payload[2], 466 eve_data->wake, true); 467 if (ret) { 468 pr_err("%s() failed for 0x%x and 0x%x: %d\r\n", __func__, 469 payload[1], payload[2], ret); 470 list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, 471 list) { 472 /* Remove already registered event from hash table */ 473 xlnx_remove_cb_for_notify_event(payload[1], payload[2], 474 cb_pos->eve_cb, 475 cb_pos->agent_data); 476 } 477 } 478 } 479 } 480 if (!is_callback_found) 481 pr_warn("Unhandled SGI node 0x%x event 0x%x. Expected with Xen hypervisor\n", 482 payload[1], payload[2]); 483 } 484 485 static void xlnx_get_event_callback_data(u32 *buf) 486 { 487 zynqmp_pm_invoke_fn(GET_CALLBACK_DATA, 0, 0, 0, 0, buf); 488 } 489 490 static irqreturn_t xlnx_event_handler(int irq, void *dev_id) 491 { 492 u32 cb_type, node_id, event, pos; 493 u32 payload[CB_MAX_PAYLOAD_SIZE] = {0}; 494 u32 event_data[CB_MAX_PAYLOAD_SIZE] = {0}; 495 496 /* Get event data */ 497 xlnx_get_event_callback_data(payload); 498 499 /* First element is callback type, others are callback arguments */ 500 cb_type = payload[0]; 501 502 if (cb_type == PM_NOTIFY_CB) { 503 node_id = payload[1]; 504 event = payload[2]; 505 if (!xlnx_is_error_event(node_id)) { 506 xlnx_call_notify_cb_handler(payload); 507 } else { 508 /* 509 * Each call back function expecting payload as an input arguments. 510 * We can get multiple error events as in one call back through error 511 * mask. So payload[2] may can contain multiple error events. 512 * In reg_driver_map database we store data in the combination of single 513 * node_id-error combination. 514 * So coping the payload message into event_data and update the 515 * event_data[2] with Error Mask for single error event and use 516 * event_data as input argument for registered call back function. 517 * 518 */ 519 memcpy(event_data, payload, (4 * CB_MAX_PAYLOAD_SIZE)); 520 /* Support Multiple Error Event */ 521 for (pos = 0; pos < MAX_BITS; pos++) { 522 if ((0 == (event & (1 << pos)))) 523 continue; 524 event_data[2] = (event & (1 << pos)); 525 xlnx_call_notify_cb_handler(event_data); 526 } 527 } 528 } else if (cb_type == PM_INIT_SUSPEND_CB) { 529 xlnx_call_suspend_cb_handler(payload); 530 } else { 531 pr_err("%s() Unsupported Callback %d\n", __func__, cb_type); 532 } 533 534 return IRQ_HANDLED; 535 } 536 537 static int xlnx_event_cpuhp_start(unsigned int cpu) 538 { 539 enable_percpu_irq(virq_sgi, IRQ_TYPE_NONE); 540 541 return 0; 542 } 543 544 static int xlnx_event_cpuhp_down(unsigned int cpu) 545 { 546 disable_percpu_irq(virq_sgi); 547 548 return 0; 549 } 550 551 static void xlnx_disable_percpu_irq(void *data) 552 { 553 disable_percpu_irq(virq_sgi); 554 } 555 556 static int xlnx_event_init_sgi(struct platform_device *pdev) 557 { 558 int ret = 0; 559 /* 560 * IRQ related structures are used for the following: 561 * for each SGI interrupt ensure its mapped by GIC IRQ domain 562 * and that each corresponding linux IRQ for the HW IRQ has 563 * a handler for when receiving an interrupt from the remote 564 * processor. 565 */ 566 struct irq_domain *domain; 567 struct irq_fwspec sgi_fwspec; 568 struct device_node *interrupt_parent = NULL; 569 struct device *parent = pdev->dev.parent; 570 571 /* Find GIC controller to map SGIs. */ 572 interrupt_parent = of_irq_find_parent(parent->of_node); 573 if (!interrupt_parent) { 574 dev_err(&pdev->dev, "Failed to find property for Interrupt parent\n"); 575 return -EINVAL; 576 } 577 578 /* Each SGI needs to be associated with GIC's IRQ domain. */ 579 domain = irq_find_host(interrupt_parent); 580 of_node_put(interrupt_parent); 581 582 /* Each mapping needs GIC domain when finding IRQ mapping. */ 583 sgi_fwspec.fwnode = domain->fwnode; 584 585 /* 586 * When irq domain looks at mapping each arg is as follows: 587 * 3 args for: interrupt type (SGI), interrupt # (set later), type 588 */ 589 sgi_fwspec.param_count = 1; 590 591 /* Set SGI's hwirq */ 592 sgi_fwspec.param[0] = sgi_num; 593 virq_sgi = irq_create_fwspec_mapping(&sgi_fwspec); 594 595 ret = request_percpu_irq(virq_sgi, xlnx_event_handler, "xlnx_event_mgmt", 596 &dummy_cpu_number); 597 598 WARN_ON(ret); 599 if (ret) { 600 irq_dispose_mapping(virq_sgi); 601 return ret; 602 } 603 604 irq_to_desc(virq_sgi); 605 irq_set_status_flags(virq_sgi, IRQ_PER_CPU); 606 607 return ret; 608 } 609 610 static void xlnx_event_cleanup_sgi(struct platform_device *pdev) 611 { 612 cpuhp_remove_state(CPUHP_AP_ONLINE_DYN); 613 614 on_each_cpu(xlnx_disable_percpu_irq, NULL, 1); 615 616 irq_clear_status_flags(virq_sgi, IRQ_PER_CPU); 617 free_percpu_irq(virq_sgi, &dummy_cpu_number); 618 irq_dispose_mapping(virq_sgi); 619 } 620 621 static int xlnx_event_manager_probe(struct platform_device *pdev) 622 { 623 int ret; 624 625 ret = zynqmp_pm_feature(PM_REGISTER_NOTIFIER); 626 if (ret < 0) { 627 dev_err(&pdev->dev, "Feature check failed with %d\n", ret); 628 return ret; 629 } 630 631 if ((ret & FIRMWARE_VERSION_MASK) < 632 REGISTER_NOTIFIER_FIRMWARE_VERSION) { 633 dev_err(&pdev->dev, "Register notifier version error. Expected Firmware: v%d - Found: v%d\n", 634 REGISTER_NOTIFIER_FIRMWARE_VERSION, 635 ret & FIRMWARE_VERSION_MASK); 636 return -EOPNOTSUPP; 637 } 638 639 /* Initialize the SGI */ 640 ret = xlnx_event_init_sgi(pdev); 641 if (ret) { 642 dev_err(&pdev->dev, "SGI Init has been failed with %d\n", ret); 643 return ret; 644 } 645 646 /* Setup function for the CPU hot-plug cases */ 647 cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "soc/event:starting", 648 xlnx_event_cpuhp_start, xlnx_event_cpuhp_down); 649 650 ret = zynqmp_pm_register_sgi(sgi_num, 0); 651 if (ret) { 652 dev_err(&pdev->dev, "SGI %d Registration over TF-A failed with %d\n", sgi_num, ret); 653 xlnx_event_cleanup_sgi(pdev); 654 return ret; 655 } 656 657 event_manager_availability = 0; 658 659 dev_info(&pdev->dev, "SGI %d Registered over TF-A\n", sgi_num); 660 dev_info(&pdev->dev, "Xilinx Event Management driver probed\n"); 661 662 return ret; 663 } 664 665 static void xlnx_event_manager_remove(struct platform_device *pdev) 666 { 667 int i; 668 struct registered_event_data *eve_data; 669 struct hlist_node *tmp; 670 int ret; 671 struct agent_cb *cb_pos; 672 struct agent_cb *cb_next; 673 674 hash_for_each_safe(reg_driver_map, i, tmp, eve_data, hentry) { 675 list_for_each_entry_safe(cb_pos, cb_next, &eve_data->cb_list_head, list) { 676 list_del_init(&cb_pos->list); 677 kfree(cb_pos); 678 } 679 hash_del(&eve_data->hentry); 680 kfree(eve_data); 681 } 682 683 ret = zynqmp_pm_register_sgi(0, 1); 684 if (ret) 685 dev_err(&pdev->dev, "SGI unregistration over TF-A failed with %d\n", ret); 686 687 xlnx_event_cleanup_sgi(pdev); 688 689 event_manager_availability = -EACCES; 690 } 691 692 static struct platform_driver xlnx_event_manager_driver = { 693 .probe = xlnx_event_manager_probe, 694 .remove_new = xlnx_event_manager_remove, 695 .driver = { 696 .name = "xlnx_event_manager", 697 }, 698 }; 699 module_param(sgi_num, uint, 0); 700 module_platform_driver(xlnx_event_manager_driver); 701