1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * fsl-mc object allocator driver 4 * 5 * Copyright (C) 2013-2016 Freescale Semiconductor, Inc. 6 * 7 */ 8 9 #include <linux/module.h> 10 #include <linux/msi.h> 11 #include <linux/fsl/mc.h> 12 13 #include "fsl-mc-private.h" 14 15 static bool __must_check fsl_mc_is_allocatable(struct fsl_mc_device *mc_dev) 16 { 17 return is_fsl_mc_bus_dpbp(mc_dev) || 18 is_fsl_mc_bus_dpmcp(mc_dev) || 19 is_fsl_mc_bus_dpcon(mc_dev); 20 } 21 22 /** 23 * fsl_mc_resource_pool_add_device - add allocatable object to a resource 24 * pool of a given fsl-mc bus 25 * 26 * @mc_bus: pointer to the fsl-mc bus 27 * @pool_type: pool type 28 * @mc_dev: pointer to allocatable fsl-mc device 29 */ 30 static int __must_check fsl_mc_resource_pool_add_device(struct fsl_mc_bus 31 *mc_bus, 32 enum fsl_mc_pool_type 33 pool_type, 34 struct fsl_mc_device 35 *mc_dev) 36 { 37 struct fsl_mc_resource_pool *res_pool; 38 struct fsl_mc_resource *resource; 39 struct fsl_mc_device *mc_bus_dev = &mc_bus->mc_dev; 40 int error = -EINVAL; 41 42 if (pool_type < 0 || pool_type >= FSL_MC_NUM_POOL_TYPES) 43 goto out; 44 if (!fsl_mc_is_allocatable(mc_dev)) 45 goto out; 46 if (mc_dev->resource) 47 goto out; 48 49 res_pool = &mc_bus->resource_pools[pool_type]; 50 if (res_pool->type != pool_type) 51 goto out; 52 if (res_pool->mc_bus != mc_bus) 53 goto out; 54 55 mutex_lock(&res_pool->mutex); 56 57 if (res_pool->max_count < 0) 58 goto out_unlock; 59 if (res_pool->free_count < 0 || 60 res_pool->free_count > res_pool->max_count) 61 goto out_unlock; 62 63 resource = devm_kzalloc(&mc_bus_dev->dev, sizeof(*resource), 64 GFP_KERNEL); 65 if (!resource) { 66 error = -ENOMEM; 67 dev_err(&mc_bus_dev->dev, 68 "Failed to allocate memory for fsl_mc_resource\n"); 69 goto out_unlock; 70 } 71 72 resource->type = pool_type; 73 resource->id = mc_dev->obj_desc.id; 74 resource->data = mc_dev; 75 resource->parent_pool = res_pool; 76 INIT_LIST_HEAD(&resource->node); 77 list_add_tail(&resource->node, &res_pool->free_list); 78 mc_dev->resource = resource; 79 res_pool->free_count++; 80 res_pool->max_count++; 81 error = 0; 82 out_unlock: 83 mutex_unlock(&res_pool->mutex); 84 out: 85 return error; 86 } 87 88 /** 89 * fsl_mc_resource_pool_remove_device - remove an allocatable device from a 90 * resource pool 91 * 92 * @mc_dev: pointer to allocatable fsl-mc device 93 * 94 * It permanently removes an allocatable fsl-mc device from the resource 95 * pool. It's an error if the device is in use. 96 */ 97 static int __must_check fsl_mc_resource_pool_remove_device(struct fsl_mc_device 98 *mc_dev) 99 { 100 struct fsl_mc_device *mc_bus_dev; 101 struct fsl_mc_bus *mc_bus; 102 struct fsl_mc_resource_pool *res_pool; 103 struct fsl_mc_resource *resource; 104 int error = -EINVAL; 105 106 if (!fsl_mc_is_allocatable(mc_dev)) 107 goto out; 108 109 resource = mc_dev->resource; 110 if (!resource || resource->data != mc_dev) 111 goto out; 112 113 mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent); 114 mc_bus = to_fsl_mc_bus(mc_bus_dev); 115 res_pool = resource->parent_pool; 116 if (res_pool != &mc_bus->resource_pools[resource->type]) 117 goto out; 118 119 mutex_lock(&res_pool->mutex); 120 121 if (res_pool->max_count <= 0) 122 goto out_unlock; 123 if (res_pool->free_count <= 0 || 124 res_pool->free_count > res_pool->max_count) 125 goto out_unlock; 126 127 /* 128 * If the device is currently allocated, its resource is not 129 * in the free list and thus, the device cannot be removed. 130 */ 131 if (list_empty(&resource->node)) { 132 error = -EBUSY; 133 dev_err(&mc_bus_dev->dev, 134 "Device %s cannot be removed from resource pool\n", 135 dev_name(&mc_dev->dev)); 136 goto out_unlock; 137 } 138 139 list_del_init(&resource->node); 140 res_pool->free_count--; 141 res_pool->max_count--; 142 143 devm_kfree(&mc_bus_dev->dev, resource); 144 mc_dev->resource = NULL; 145 error = 0; 146 out_unlock: 147 mutex_unlock(&res_pool->mutex); 148 out: 149 return error; 150 } 151 152 static const char *const fsl_mc_pool_type_strings[] = { 153 [FSL_MC_POOL_DPMCP] = "dpmcp", 154 [FSL_MC_POOL_DPBP] = "dpbp", 155 [FSL_MC_POOL_DPCON] = "dpcon", 156 [FSL_MC_POOL_IRQ] = "irq", 157 }; 158 159 static int __must_check object_type_to_pool_type(const char *object_type, 160 enum fsl_mc_pool_type 161 *pool_type) 162 { 163 unsigned int i; 164 165 for (i = 0; i < ARRAY_SIZE(fsl_mc_pool_type_strings); i++) { 166 if (strcmp(object_type, fsl_mc_pool_type_strings[i]) == 0) { 167 *pool_type = i; 168 return 0; 169 } 170 } 171 172 return -EINVAL; 173 } 174 175 int __must_check fsl_mc_resource_allocate(struct fsl_mc_bus *mc_bus, 176 enum fsl_mc_pool_type pool_type, 177 struct fsl_mc_resource **new_resource) 178 { 179 struct fsl_mc_resource_pool *res_pool; 180 struct fsl_mc_resource *resource; 181 struct fsl_mc_device *mc_bus_dev = &mc_bus->mc_dev; 182 int error = -EINVAL; 183 184 BUILD_BUG_ON(ARRAY_SIZE(fsl_mc_pool_type_strings) != 185 FSL_MC_NUM_POOL_TYPES); 186 187 *new_resource = NULL; 188 if (pool_type < 0 || pool_type >= FSL_MC_NUM_POOL_TYPES) 189 goto out; 190 191 res_pool = &mc_bus->resource_pools[pool_type]; 192 if (res_pool->mc_bus != mc_bus) 193 goto out; 194 195 mutex_lock(&res_pool->mutex); 196 resource = list_first_entry_or_null(&res_pool->free_list, 197 struct fsl_mc_resource, node); 198 199 if (!resource) { 200 error = -ENXIO; 201 dev_err(&mc_bus_dev->dev, 202 "No more resources of type %s left\n", 203 fsl_mc_pool_type_strings[pool_type]); 204 goto out_unlock; 205 } 206 207 if (resource->type != pool_type) 208 goto out_unlock; 209 if (resource->parent_pool != res_pool) 210 goto out_unlock; 211 if (res_pool->free_count <= 0 || 212 res_pool->free_count > res_pool->max_count) 213 goto out_unlock; 214 215 list_del_init(&resource->node); 216 217 res_pool->free_count--; 218 error = 0; 219 out_unlock: 220 mutex_unlock(&res_pool->mutex); 221 *new_resource = resource; 222 out: 223 return error; 224 } 225 EXPORT_SYMBOL_GPL(fsl_mc_resource_allocate); 226 227 void fsl_mc_resource_free(struct fsl_mc_resource *resource) 228 { 229 struct fsl_mc_resource_pool *res_pool; 230 231 res_pool = resource->parent_pool; 232 if (resource->type != res_pool->type) 233 return; 234 235 mutex_lock(&res_pool->mutex); 236 if (res_pool->free_count < 0 || 237 res_pool->free_count >= res_pool->max_count) 238 goto out_unlock; 239 240 if (!list_empty(&resource->node)) 241 goto out_unlock; 242 243 list_add_tail(&resource->node, &res_pool->free_list); 244 res_pool->free_count++; 245 out_unlock: 246 mutex_unlock(&res_pool->mutex); 247 } 248 EXPORT_SYMBOL_GPL(fsl_mc_resource_free); 249 250 /** 251 * fsl_mc_object_allocate - Allocates an fsl-mc object of the given 252 * pool type from a given fsl-mc bus instance 253 * 254 * @mc_dev: fsl-mc device which is used in conjunction with the 255 * allocated object 256 * @pool_type: pool type 257 * @new_mc_adev: pointer to area where the pointer to the allocated device 258 * is to be returned 259 * 260 * Allocatable objects are always used in conjunction with some functional 261 * device. This function allocates an object of the specified type from 262 * the DPRC containing the functional device. 263 * 264 * NOTE: pool_type must be different from FSL_MC_POOL_MCP, since MC 265 * portals are allocated using fsl_mc_portal_allocate(), instead of 266 * this function. 267 */ 268 int __must_check fsl_mc_object_allocate(struct fsl_mc_device *mc_dev, 269 enum fsl_mc_pool_type pool_type, 270 struct fsl_mc_device **new_mc_adev) 271 { 272 struct fsl_mc_device *mc_bus_dev; 273 struct fsl_mc_bus *mc_bus; 274 struct fsl_mc_device *mc_adev; 275 int error = -EINVAL; 276 struct fsl_mc_resource *resource = NULL; 277 278 *new_mc_adev = NULL; 279 if (mc_dev->flags & FSL_MC_IS_DPRC) 280 goto error; 281 282 if (!dev_is_fsl_mc(mc_dev->dev.parent)) 283 goto error; 284 285 if (pool_type == FSL_MC_POOL_DPMCP) 286 goto error; 287 288 mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent); 289 mc_bus = to_fsl_mc_bus(mc_bus_dev); 290 error = fsl_mc_resource_allocate(mc_bus, pool_type, &resource); 291 if (error < 0) 292 goto error; 293 294 mc_adev = resource->data; 295 if (!mc_adev) { 296 error = -EINVAL; 297 goto error; 298 } 299 300 mc_adev->consumer_link = device_link_add(&mc_dev->dev, 301 &mc_adev->dev, 302 DL_FLAG_AUTOREMOVE_CONSUMER); 303 if (!mc_adev->consumer_link) { 304 error = -EINVAL; 305 goto error; 306 } 307 308 *new_mc_adev = mc_adev; 309 return 0; 310 error: 311 if (resource) 312 fsl_mc_resource_free(resource); 313 314 return error; 315 } 316 EXPORT_SYMBOL_GPL(fsl_mc_object_allocate); 317 318 /** 319 * fsl_mc_object_free - Returns an fsl-mc object to the resource 320 * pool where it came from. 321 * @mc_adev: Pointer to the fsl-mc device 322 */ 323 void fsl_mc_object_free(struct fsl_mc_device *mc_adev) 324 { 325 struct fsl_mc_resource *resource; 326 327 resource = mc_adev->resource; 328 if (resource->type == FSL_MC_POOL_DPMCP) 329 return; 330 if (resource->data != mc_adev) 331 return; 332 333 fsl_mc_resource_free(resource); 334 335 mc_adev->consumer_link = NULL; 336 } 337 EXPORT_SYMBOL_GPL(fsl_mc_object_free); 338 339 /* 340 * A DPRC and the devices in the DPRC all share the same GIC-ITS device 341 * ID. A block of IRQs is pre-allocated and maintained in a pool 342 * from which devices can allocate them when needed. 343 */ 344 345 /* 346 * Initialize the interrupt pool associated with an fsl-mc bus. 347 * It allocates a block of IRQs from the GIC-ITS. 348 */ 349 int fsl_mc_populate_irq_pool(struct fsl_mc_device *mc_bus_dev, 350 unsigned int irq_count) 351 { 352 unsigned int i; 353 struct msi_desc *msi_desc; 354 struct fsl_mc_device_irq *irq_resources; 355 struct fsl_mc_device_irq *mc_dev_irq; 356 int error; 357 struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev); 358 struct fsl_mc_resource_pool *res_pool = 359 &mc_bus->resource_pools[FSL_MC_POOL_IRQ]; 360 361 /* do nothing if the IRQ pool is already populated */ 362 if (mc_bus->irq_resources) 363 return 0; 364 365 if (irq_count == 0 || 366 irq_count > FSL_MC_IRQ_POOL_MAX_TOTAL_IRQS) 367 return -EINVAL; 368 369 error = fsl_mc_msi_domain_alloc_irqs(&mc_bus_dev->dev, irq_count); 370 if (error < 0) 371 return error; 372 373 irq_resources = devm_kcalloc(&mc_bus_dev->dev, 374 irq_count, sizeof(*irq_resources), 375 GFP_KERNEL); 376 if (!irq_resources) { 377 error = -ENOMEM; 378 goto cleanup_msi_irqs; 379 } 380 381 for (i = 0; i < irq_count; i++) { 382 mc_dev_irq = &irq_resources[i]; 383 384 /* 385 * NOTE: This mc_dev_irq's MSI addr/value pair will be set 386 * by the fsl_mc_msi_write_msg() callback 387 */ 388 mc_dev_irq->resource.type = res_pool->type; 389 mc_dev_irq->resource.data = mc_dev_irq; 390 mc_dev_irq->resource.parent_pool = res_pool; 391 INIT_LIST_HEAD(&mc_dev_irq->resource.node); 392 list_add_tail(&mc_dev_irq->resource.node, &res_pool->free_list); 393 } 394 395 for_each_msi_entry(msi_desc, &mc_bus_dev->dev) { 396 mc_dev_irq = &irq_resources[msi_desc->fsl_mc.msi_index]; 397 mc_dev_irq->msi_desc = msi_desc; 398 mc_dev_irq->resource.id = msi_desc->irq; 399 } 400 401 res_pool->max_count = irq_count; 402 res_pool->free_count = irq_count; 403 mc_bus->irq_resources = irq_resources; 404 return 0; 405 406 cleanup_msi_irqs: 407 fsl_mc_msi_domain_free_irqs(&mc_bus_dev->dev); 408 return error; 409 } 410 EXPORT_SYMBOL_GPL(fsl_mc_populate_irq_pool); 411 412 /* 413 * Teardown the interrupt pool associated with an fsl-mc bus. 414 * It frees the IRQs that were allocated to the pool, back to the GIC-ITS. 415 */ 416 void fsl_mc_cleanup_irq_pool(struct fsl_mc_device *mc_bus_dev) 417 { 418 struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev); 419 struct fsl_mc_resource_pool *res_pool = 420 &mc_bus->resource_pools[FSL_MC_POOL_IRQ]; 421 422 if (!mc_bus->irq_resources) 423 return; 424 425 if (res_pool->max_count == 0) 426 return; 427 428 if (res_pool->free_count != res_pool->max_count) 429 return; 430 431 INIT_LIST_HEAD(&res_pool->free_list); 432 res_pool->max_count = 0; 433 res_pool->free_count = 0; 434 mc_bus->irq_resources = NULL; 435 fsl_mc_msi_domain_free_irqs(&mc_bus_dev->dev); 436 } 437 EXPORT_SYMBOL_GPL(fsl_mc_cleanup_irq_pool); 438 439 /* 440 * Allocate the IRQs required by a given fsl-mc device. 441 */ 442 int __must_check fsl_mc_allocate_irqs(struct fsl_mc_device *mc_dev) 443 { 444 int i; 445 int irq_count; 446 int res_allocated_count = 0; 447 int error = -EINVAL; 448 struct fsl_mc_device_irq **irqs = NULL; 449 struct fsl_mc_bus *mc_bus; 450 struct fsl_mc_resource_pool *res_pool; 451 452 if (mc_dev->irqs) 453 return -EINVAL; 454 455 irq_count = mc_dev->obj_desc.irq_count; 456 if (irq_count == 0) 457 return -EINVAL; 458 459 if (is_fsl_mc_bus_dprc(mc_dev)) 460 mc_bus = to_fsl_mc_bus(mc_dev); 461 else 462 mc_bus = to_fsl_mc_bus(to_fsl_mc_device(mc_dev->dev.parent)); 463 464 if (!mc_bus->irq_resources) 465 return -EINVAL; 466 467 res_pool = &mc_bus->resource_pools[FSL_MC_POOL_IRQ]; 468 if (res_pool->free_count < irq_count) { 469 dev_err(&mc_dev->dev, 470 "Not able to allocate %u irqs for device\n", irq_count); 471 return -ENOSPC; 472 } 473 474 irqs = devm_kcalloc(&mc_dev->dev, irq_count, sizeof(irqs[0]), 475 GFP_KERNEL); 476 if (!irqs) 477 return -ENOMEM; 478 479 for (i = 0; i < irq_count; i++) { 480 struct fsl_mc_resource *resource; 481 482 error = fsl_mc_resource_allocate(mc_bus, FSL_MC_POOL_IRQ, 483 &resource); 484 if (error < 0) 485 goto error_resource_alloc; 486 487 irqs[i] = to_fsl_mc_irq(resource); 488 res_allocated_count++; 489 490 irqs[i]->mc_dev = mc_dev; 491 irqs[i]->dev_irq_index = i; 492 } 493 494 mc_dev->irqs = irqs; 495 return 0; 496 497 error_resource_alloc: 498 for (i = 0; i < res_allocated_count; i++) { 499 irqs[i]->mc_dev = NULL; 500 fsl_mc_resource_free(&irqs[i]->resource); 501 } 502 503 return error; 504 } 505 EXPORT_SYMBOL_GPL(fsl_mc_allocate_irqs); 506 507 /* 508 * Frees the IRQs that were allocated for an fsl-mc device. 509 */ 510 void fsl_mc_free_irqs(struct fsl_mc_device *mc_dev) 511 { 512 int i; 513 int irq_count; 514 struct fsl_mc_bus *mc_bus; 515 struct fsl_mc_device_irq **irqs = mc_dev->irqs; 516 517 if (!irqs) 518 return; 519 520 irq_count = mc_dev->obj_desc.irq_count; 521 522 if (is_fsl_mc_bus_dprc(mc_dev)) 523 mc_bus = to_fsl_mc_bus(mc_dev); 524 else 525 mc_bus = to_fsl_mc_bus(to_fsl_mc_device(mc_dev->dev.parent)); 526 527 if (!mc_bus->irq_resources) 528 return; 529 530 for (i = 0; i < irq_count; i++) { 531 irqs[i]->mc_dev = NULL; 532 fsl_mc_resource_free(&irqs[i]->resource); 533 } 534 535 mc_dev->irqs = NULL; 536 } 537 EXPORT_SYMBOL_GPL(fsl_mc_free_irqs); 538 539 void fsl_mc_init_all_resource_pools(struct fsl_mc_device *mc_bus_dev) 540 { 541 int pool_type; 542 struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev); 543 544 for (pool_type = 0; pool_type < FSL_MC_NUM_POOL_TYPES; pool_type++) { 545 struct fsl_mc_resource_pool *res_pool = 546 &mc_bus->resource_pools[pool_type]; 547 548 res_pool->type = pool_type; 549 res_pool->max_count = 0; 550 res_pool->free_count = 0; 551 res_pool->mc_bus = mc_bus; 552 INIT_LIST_HEAD(&res_pool->free_list); 553 mutex_init(&res_pool->mutex); 554 } 555 } 556 557 static void fsl_mc_cleanup_resource_pool(struct fsl_mc_device *mc_bus_dev, 558 enum fsl_mc_pool_type pool_type) 559 { 560 struct fsl_mc_resource *resource; 561 struct fsl_mc_resource *next; 562 struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_bus_dev); 563 struct fsl_mc_resource_pool *res_pool = 564 &mc_bus->resource_pools[pool_type]; 565 int free_count = 0; 566 567 list_for_each_entry_safe(resource, next, &res_pool->free_list, node) { 568 free_count++; 569 devm_kfree(&mc_bus_dev->dev, resource); 570 } 571 } 572 573 void fsl_mc_cleanup_all_resource_pools(struct fsl_mc_device *mc_bus_dev) 574 { 575 int pool_type; 576 577 for (pool_type = 0; pool_type < FSL_MC_NUM_POOL_TYPES; pool_type++) 578 fsl_mc_cleanup_resource_pool(mc_bus_dev, pool_type); 579 } 580 581 /* 582 * fsl_mc_allocator_probe - callback invoked when an allocatable device is 583 * being added to the system 584 */ 585 static int fsl_mc_allocator_probe(struct fsl_mc_device *mc_dev) 586 { 587 enum fsl_mc_pool_type pool_type; 588 struct fsl_mc_device *mc_bus_dev; 589 struct fsl_mc_bus *mc_bus; 590 int error; 591 592 if (!fsl_mc_is_allocatable(mc_dev)) 593 return -EINVAL; 594 595 mc_bus_dev = to_fsl_mc_device(mc_dev->dev.parent); 596 if (!dev_is_fsl_mc(&mc_bus_dev->dev)) 597 return -EINVAL; 598 599 mc_bus = to_fsl_mc_bus(mc_bus_dev); 600 error = object_type_to_pool_type(mc_dev->obj_desc.type, &pool_type); 601 if (error < 0) 602 return error; 603 604 error = fsl_mc_resource_pool_add_device(mc_bus, pool_type, mc_dev); 605 if (error < 0) 606 return error; 607 608 dev_dbg(&mc_dev->dev, 609 "Allocatable fsl-mc device bound to fsl_mc_allocator driver"); 610 return 0; 611 } 612 613 /* 614 * fsl_mc_allocator_remove - callback invoked when an allocatable device is 615 * being removed from the system 616 */ 617 static int fsl_mc_allocator_remove(struct fsl_mc_device *mc_dev) 618 { 619 int error; 620 621 if (!fsl_mc_is_allocatable(mc_dev)) 622 return -EINVAL; 623 624 if (mc_dev->resource) { 625 error = fsl_mc_resource_pool_remove_device(mc_dev); 626 if (error < 0) 627 return error; 628 } 629 630 dev_dbg(&mc_dev->dev, 631 "Allocatable fsl-mc device unbound from fsl_mc_allocator driver"); 632 return 0; 633 } 634 635 static const struct fsl_mc_device_id match_id_table[] = { 636 { 637 .vendor = FSL_MC_VENDOR_FREESCALE, 638 .obj_type = "dpbp", 639 }, 640 { 641 .vendor = FSL_MC_VENDOR_FREESCALE, 642 .obj_type = "dpmcp", 643 }, 644 { 645 .vendor = FSL_MC_VENDOR_FREESCALE, 646 .obj_type = "dpcon", 647 }, 648 {.vendor = 0x0}, 649 }; 650 651 static struct fsl_mc_driver fsl_mc_allocator_driver = { 652 .driver = { 653 .name = "fsl_mc_allocator", 654 .pm = NULL, 655 }, 656 .match_id_table = match_id_table, 657 .probe = fsl_mc_allocator_probe, 658 .remove = fsl_mc_allocator_remove, 659 }; 660 661 int __init fsl_mc_allocator_driver_init(void) 662 { 663 return fsl_mc_driver_register(&fsl_mc_allocator_driver); 664 } 665 666 void fsl_mc_allocator_driver_exit(void) 667 { 668 fsl_mc_driver_unregister(&fsl_mc_allocator_driver); 669 } 670