1/* 2 * IBM PowerPC Virtual I/O Infrastructure Support. 3 * 4 * Copyright (c) 2003,2008 IBM Corp. 5 * Dave Engebretsen engebret@us.ibm.com 6 * Santiago Leon santil@us.ibm.com 7 * Hollis Blanchard <hollisb@us.ibm.com> 8 * Stephen Rothwell 9 * Robert Jennings <rcjenn@us.ibm.com> 10 * 11 * This program is free software; you can redistribute it and/or 12 * modify it under the terms of the GNU General Public License 13 * as published by the Free Software Foundation; either version 14 * 2 of the License, or (at your option) any later version. 15 */ 16 17#include <linux/cpu.h> 18#include <linux/types.h> 19#include <linux/delay.h> 20#include <linux/stat.h> 21#include <linux/device.h> 22#include <linux/init.h> 23#include <linux/slab.h> 24#include <linux/console.h> 25#include <linux/export.h> 26#include <linux/mm.h> 27#include <linux/dma-mapping.h> 28#include <linux/kobject.h> 29 30#include <asm/iommu.h> 31#include <asm/dma.h> 32#include <asm/vio.h> 33#include <asm/prom.h> 34#include <asm/firmware.h> 35#include <asm/tce.h> 36#include <asm/page.h> 37#include <asm/hvcall.h> 38 39static struct vio_dev vio_bus_device = { /* fake "parent" device */ 40 .name = "vio", 41 .type = "", 42 .dev.init_name = "vio", 43 .dev.bus = &vio_bus_type, 44}; 45 46#ifdef CONFIG_PPC_SMLPAR 47/** 48 * vio_cmo_pool - A pool of IO memory for CMO use 49 * 50 * @size: The size of the pool in bytes 51 * @free: The amount of free memory in the pool 52 */ 53struct vio_cmo_pool { 54 size_t size; 55 size_t free; 56}; 57 58/* How many ms to delay queued balance work */ 59#define VIO_CMO_BALANCE_DELAY 100 60 61/* Portion out IO memory to CMO devices by this chunk size */ 62#define VIO_CMO_BALANCE_CHUNK 131072 63 64/** 65 * vio_cmo_dev_entry - A device that is CMO-enabled and requires entitlement 66 * 67 * @vio_dev: struct vio_dev pointer 68 * @list: pointer to other devices on bus that are being tracked 69 */ 70struct vio_cmo_dev_entry { 71 struct vio_dev *viodev; 72 struct list_head list; 73}; 74 75/** 76 * vio_cmo - VIO bus accounting structure for CMO entitlement 77 * 78 * @lock: spinlock for entire structure 79 * @balance_q: work queue for balancing system entitlement 80 * @device_list: list of CMO-enabled devices requiring entitlement 81 * @entitled: total system entitlement in bytes 82 * @reserve: pool of memory from which devices reserve entitlement, incl. spare 83 * @excess: pool of excess entitlement not needed for device reserves or spare 84 * @spare: IO memory for device hotplug functionality 85 * @min: minimum necessary for system operation 86 * @desired: desired memory for system operation 87 * @curr: bytes currently allocated 88 * @high: high water mark for IO data usage 89 */ 90struct vio_cmo { 91 spinlock_t lock; 92 struct delayed_work balance_q; 93 struct list_head device_list; 94 size_t entitled; 95 struct vio_cmo_pool reserve; 96 struct vio_cmo_pool excess; 97 size_t spare; 98 size_t min; 99 size_t desired; 100 size_t curr; 101 size_t high; 102} vio_cmo; 103 104/** 105 * vio_cmo_OF_devices - Count the number of OF devices that have DMA windows 106 */ 107static int vio_cmo_num_OF_devs(void) 108{ 109 struct device_node *node_vroot; 110 int count = 0; 111 112 /* 113 * Count the number of vdevice entries with an 114 * ibm,my-dma-window OF property 115 */ 116 node_vroot = of_find_node_by_name(NULL, "vdevice"); 117 if (node_vroot) { 118 struct device_node *of_node; 119 struct property *prop; 120 121 for_each_child_of_node(node_vroot, of_node) { 122 prop = of_find_property(of_node, "ibm,my-dma-window", 123 NULL); 124 if (prop) 125 count++; 126 } 127 } 128 of_node_put(node_vroot); 129 return count; 130} 131 132/** 133 * vio_cmo_alloc - allocate IO memory for CMO-enable devices 134 * 135 * @viodev: VIO device requesting IO memory 136 * @size: size of allocation requested 137 * 138 * Allocations come from memory reserved for the devices and any excess 139 * IO memory available to all devices. The spare pool used to service 140 * hotplug must be equal to %VIO_CMO_MIN_ENT for the excess pool to be 141 * made available. 142 * 143 * Return codes: 144 * 0 for successful allocation and -ENOMEM for a failure 145 */ 146static inline int vio_cmo_alloc(struct vio_dev *viodev, size_t size) 147{ 148 unsigned long flags; 149 size_t reserve_free = 0; 150 size_t excess_free = 0; 151 int ret = -ENOMEM; 152 153 spin_lock_irqsave(&vio_cmo.lock, flags); 154 155 /* Determine the amount of free entitlement available in reserve */ 156 if (viodev->cmo.entitled > viodev->cmo.allocated) 157 reserve_free = viodev->cmo.entitled - viodev->cmo.allocated; 158 159 /* If spare is not fulfilled, the excess pool can not be used. */ 160 if (vio_cmo.spare >= VIO_CMO_MIN_ENT) 161 excess_free = vio_cmo.excess.free; 162 163 /* The request can be satisfied */ 164 if ((reserve_free + excess_free) >= size) { 165 vio_cmo.curr += size; 166 if (vio_cmo.curr > vio_cmo.high) 167 vio_cmo.high = vio_cmo.curr; 168 viodev->cmo.allocated += size; 169 size -= min(reserve_free, size); 170 vio_cmo.excess.free -= size; 171 ret = 0; 172 } 173 174 spin_unlock_irqrestore(&vio_cmo.lock, flags); 175 return ret; 176} 177 178/** 179 * vio_cmo_dealloc - deallocate IO memory from CMO-enable devices 180 * @viodev: VIO device freeing IO memory 181 * @size: size of deallocation 182 * 183 * IO memory is freed by the device back to the correct memory pools. 184 * The spare pool is replenished first from either memory pool, then 185 * the reserve pool is used to reduce device entitlement, the excess 186 * pool is used to increase the reserve pool toward the desired entitlement 187 * target, and then the remaining memory is returned to the pools. 188 * 189 */ 190static inline void vio_cmo_dealloc(struct vio_dev *viodev, size_t size) 191{ 192 unsigned long flags; 193 size_t spare_needed = 0; 194 size_t excess_freed = 0; 195 size_t reserve_freed = size; 196 size_t tmp; 197 int balance = 0; 198 199 spin_lock_irqsave(&vio_cmo.lock, flags); 200 vio_cmo.curr -= size; 201 202 /* Amount of memory freed from the excess pool */ 203 if (viodev->cmo.allocated > viodev->cmo.entitled) { 204 excess_freed = min(reserve_freed, (viodev->cmo.allocated - 205 viodev->cmo.entitled)); 206 reserve_freed -= excess_freed; 207 } 208 209 /* Remove allocation from device */ 210 viodev->cmo.allocated -= (reserve_freed + excess_freed); 211 212 /* Spare is a subset of the reserve pool, replenish it first. */ 213 spare_needed = VIO_CMO_MIN_ENT - vio_cmo.spare; 214 215 /* 216 * Replenish the spare in the reserve pool from the excess pool. 217 * This moves entitlement into the reserve pool. 218 */ 219 if (spare_needed && excess_freed) { 220 tmp = min(excess_freed, spare_needed); 221 vio_cmo.excess.size -= tmp; 222 vio_cmo.reserve.size += tmp; 223 vio_cmo.spare += tmp; 224 excess_freed -= tmp; 225 spare_needed -= tmp; 226 balance = 1; 227 } 228 229 /* 230 * Replenish the spare in the reserve pool from the reserve pool. 231 * This removes entitlement from the device down to VIO_CMO_MIN_ENT, 232 * if needed, and gives it to the spare pool. The amount of used 233 * memory in this pool does not change. 234 */ 235 if (spare_needed && reserve_freed) { 236 tmp = min3(spare_needed, reserve_freed, (viodev->cmo.entitled - VIO_CMO_MIN_ENT)); 237 238 vio_cmo.spare += tmp; 239 viodev->cmo.entitled -= tmp; 240 reserve_freed -= tmp; 241 spare_needed -= tmp; 242 balance = 1; 243 } 244 245 /* 246 * Increase the reserve pool until the desired allocation is met. 247 * Move an allocation freed from the excess pool into the reserve 248 * pool and schedule a balance operation. 249 */ 250 if (excess_freed && (vio_cmo.desired > vio_cmo.reserve.size)) { 251 tmp = min(excess_freed, (vio_cmo.desired - vio_cmo.reserve.size)); 252 253 vio_cmo.excess.size -= tmp; 254 vio_cmo.reserve.size += tmp; 255 excess_freed -= tmp; 256 balance = 1; 257 } 258 259 /* Return memory from the excess pool to that pool */ 260 if (excess_freed) 261 vio_cmo.excess.free += excess_freed; 262 263 if (balance) 264 schedule_delayed_work(&vio_cmo.balance_q, VIO_CMO_BALANCE_DELAY); 265 spin_unlock_irqrestore(&vio_cmo.lock, flags); 266} 267 268/** 269 * vio_cmo_entitlement_update - Manage system entitlement changes 270 * 271 * @new_entitlement: new system entitlement to attempt to accommodate 272 * 273 * Increases in entitlement will be used to fulfill the spare entitlement 274 * and the rest is given to the excess pool. Decreases, if they are 275 * possible, come from the excess pool and from unused device entitlement 276 * 277 * Returns: 0 on success, -ENOMEM when change can not be made 278 */ 279int vio_cmo_entitlement_update(size_t new_entitlement) 280{ 281 struct vio_dev *viodev; 282 struct vio_cmo_dev_entry *dev_ent; 283 unsigned long flags; 284 size_t avail, delta, tmp; 285 286 spin_lock_irqsave(&vio_cmo.lock, flags); 287 288 /* Entitlement increases */ 289 if (new_entitlement > vio_cmo.entitled) { 290 delta = new_entitlement - vio_cmo.entitled; 291 292 /* Fulfill spare allocation */ 293 if (vio_cmo.spare < VIO_CMO_MIN_ENT) { 294 tmp = min(delta, (VIO_CMO_MIN_ENT - vio_cmo.spare)); 295 vio_cmo.spare += tmp; 296 vio_cmo.reserve.size += tmp; 297 delta -= tmp; 298 } 299 300 /* Remaining new allocation goes to the excess pool */ 301 vio_cmo.entitled += delta; 302 vio_cmo.excess.size += delta; 303 vio_cmo.excess.free += delta; 304 305 goto out; 306 } 307 308 /* Entitlement decreases */ 309 delta = vio_cmo.entitled - new_entitlement; 310 avail = vio_cmo.excess.free; 311 312 /* 313 * Need to check how much unused entitlement each device can 314 * sacrifice to fulfill entitlement change. 315 */ 316 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) { 317 if (avail >= delta) 318 break; 319 320 viodev = dev_ent->viodev; 321 if ((viodev->cmo.entitled > viodev->cmo.allocated) && 322 (viodev->cmo.entitled > VIO_CMO_MIN_ENT)) 323 avail += viodev->cmo.entitled - 324 max_t(size_t, viodev->cmo.allocated, 325 VIO_CMO_MIN_ENT); 326 } 327 328 if (delta <= avail) { 329 vio_cmo.entitled -= delta; 330 331 /* Take entitlement from the excess pool first */ 332 tmp = min(vio_cmo.excess.free, delta); 333 vio_cmo.excess.size -= tmp; 334 vio_cmo.excess.free -= tmp; 335 delta -= tmp; 336 337 /* 338 * Remove all but VIO_CMO_MIN_ENT bytes from devices 339 * until entitlement change is served 340 */ 341 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) { 342 if (!delta) 343 break; 344 345 viodev = dev_ent->viodev; 346 tmp = 0; 347 if ((viodev->cmo.entitled > viodev->cmo.allocated) && 348 (viodev->cmo.entitled > VIO_CMO_MIN_ENT)) 349 tmp = viodev->cmo.entitled - 350 max_t(size_t, viodev->cmo.allocated, 351 VIO_CMO_MIN_ENT); 352 viodev->cmo.entitled -= min(tmp, delta); 353 delta -= min(tmp, delta); 354 } 355 } else { 356 spin_unlock_irqrestore(&vio_cmo.lock, flags); 357 return -ENOMEM; 358 } 359 360out: 361 schedule_delayed_work(&vio_cmo.balance_q, 0); 362 spin_unlock_irqrestore(&vio_cmo.lock, flags); 363 return 0; 364} 365 366/** 367 * vio_cmo_balance - Balance entitlement among devices 368 * 369 * @work: work queue structure for this operation 370 * 371 * Any system entitlement above the minimum needed for devices, or 372 * already allocated to devices, can be distributed to the devices. 373 * The list of devices is iterated through to recalculate the desired 374 * entitlement level and to determine how much entitlement above the 375 * minimum entitlement is allocated to devices. 376 * 377 * Small chunks of the available entitlement are given to devices until 378 * their requirements are fulfilled or there is no entitlement left to give. 379 * Upon completion sizes of the reserve and excess pools are calculated. 380 * 381 * The system minimum entitlement level is also recalculated here. 382 * Entitlement will be reserved for devices even after vio_bus_remove to 383 * accommodate reloading the driver. The OF tree is walked to count the 384 * number of devices present and this will remove entitlement for devices 385 * that have actually left the system after having vio_bus_remove called. 386 */ 387static void vio_cmo_balance(struct work_struct *work) 388{ 389 struct vio_cmo *cmo; 390 struct vio_dev *viodev; 391 struct vio_cmo_dev_entry *dev_ent; 392 unsigned long flags; 393 size_t avail = 0, level, chunk, need; 394 int devcount = 0, fulfilled; 395 396 cmo = container_of(work, struct vio_cmo, balance_q.work); 397 398 spin_lock_irqsave(&vio_cmo.lock, flags); 399 400 /* Calculate minimum entitlement and fulfill spare */ 401 cmo->min = vio_cmo_num_OF_devs() * VIO_CMO_MIN_ENT; 402 BUG_ON(cmo->min > cmo->entitled); 403 cmo->spare = min_t(size_t, VIO_CMO_MIN_ENT, (cmo->entitled - cmo->min)); 404 cmo->min += cmo->spare; 405 cmo->desired = cmo->min; 406 407 /* 408 * Determine how much entitlement is available and reset device 409 * entitlements 410 */ 411 avail = cmo->entitled - cmo->spare; 412 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) { 413 viodev = dev_ent->viodev; 414 devcount++; 415 viodev->cmo.entitled = VIO_CMO_MIN_ENT; 416 cmo->desired += (viodev->cmo.desired - VIO_CMO_MIN_ENT); 417 avail -= max_t(size_t, viodev->cmo.allocated, VIO_CMO_MIN_ENT); 418 } 419 420 /* 421 * Having provided each device with the minimum entitlement, loop 422 * over the devices portioning out the remaining entitlement 423 * until there is nothing left. 424 */ 425 level = VIO_CMO_MIN_ENT; 426 while (avail) { 427 fulfilled = 0; 428 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) { 429 viodev = dev_ent->viodev; 430 431 if (viodev->cmo.desired <= level) { 432 fulfilled++; 433 continue; 434 } 435 436 /* 437 * Give the device up to VIO_CMO_BALANCE_CHUNK 438 * bytes of entitlement, but do not exceed the 439 * desired level of entitlement for the device. 440 */ 441 chunk = min_t(size_t, avail, VIO_CMO_BALANCE_CHUNK); 442 chunk = min(chunk, (viodev->cmo.desired - 443 viodev->cmo.entitled)); 444 viodev->cmo.entitled += chunk; 445 446 /* 447 * If the memory for this entitlement increase was 448 * already allocated to the device it does not come 449 * from the available pool being portioned out. 450 */ 451 need = max(viodev->cmo.allocated, viodev->cmo.entitled)- 452 max(viodev->cmo.allocated, level); 453 avail -= need; 454 455 } 456 if (fulfilled == devcount) 457 break; 458 level += VIO_CMO_BALANCE_CHUNK; 459 } 460 461 /* Calculate new reserve and excess pool sizes */ 462 cmo->reserve.size = cmo->min; 463 cmo->excess.free = 0; 464 cmo->excess.size = 0; 465 need = 0; 466 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) { 467 viodev = dev_ent->viodev; 468 /* Calculated reserve size above the minimum entitlement */ 469 if (viodev->cmo.entitled) 470 cmo->reserve.size += (viodev->cmo.entitled - 471 VIO_CMO_MIN_ENT); 472 /* Calculated used excess entitlement */ 473 if (viodev->cmo.allocated > viodev->cmo.entitled) 474 need += viodev->cmo.allocated - viodev->cmo.entitled; 475 } 476 cmo->excess.size = cmo->entitled - cmo->reserve.size; 477 cmo->excess.free = cmo->excess.size - need; 478 479 cancel_delayed_work(to_delayed_work(work)); 480 spin_unlock_irqrestore(&vio_cmo.lock, flags); 481} 482 483static void *vio_dma_iommu_alloc_coherent(struct device *dev, size_t size, 484 dma_addr_t *dma_handle, gfp_t flag, 485 struct dma_attrs *attrs) 486{ 487 struct vio_dev *viodev = to_vio_dev(dev); 488 void *ret; 489 490 if (vio_cmo_alloc(viodev, roundup(size, PAGE_SIZE))) { 491 atomic_inc(&viodev->cmo.allocs_failed); 492 return NULL; 493 } 494 495 ret = dma_iommu_ops.alloc(dev, size, dma_handle, flag, attrs); 496 if (unlikely(ret == NULL)) { 497 vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE)); 498 atomic_inc(&viodev->cmo.allocs_failed); 499 } 500 501 return ret; 502} 503 504static void vio_dma_iommu_free_coherent(struct device *dev, size_t size, 505 void *vaddr, dma_addr_t dma_handle, 506 struct dma_attrs *attrs) 507{ 508 struct vio_dev *viodev = to_vio_dev(dev); 509 510 dma_iommu_ops.free(dev, size, vaddr, dma_handle, attrs); 511 512 vio_cmo_dealloc(viodev, roundup(size, PAGE_SIZE)); 513} 514 515static dma_addr_t vio_dma_iommu_map_page(struct device *dev, struct page *page, 516 unsigned long offset, size_t size, 517 enum dma_data_direction direction, 518 struct dma_attrs *attrs) 519{ 520 struct vio_dev *viodev = to_vio_dev(dev); 521 struct iommu_table *tbl; 522 dma_addr_t ret = DMA_ERROR_CODE; 523 524 tbl = get_iommu_table_base(dev); 525 if (vio_cmo_alloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl)))) { 526 atomic_inc(&viodev->cmo.allocs_failed); 527 return ret; 528 } 529 530 ret = dma_iommu_ops.map_page(dev, page, offset, size, direction, attrs); 531 if (unlikely(dma_mapping_error(dev, ret))) { 532 vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl))); 533 atomic_inc(&viodev->cmo.allocs_failed); 534 } 535 536 return ret; 537} 538 539static void vio_dma_iommu_unmap_page(struct device *dev, dma_addr_t dma_handle, 540 size_t size, 541 enum dma_data_direction direction, 542 struct dma_attrs *attrs) 543{ 544 struct vio_dev *viodev = to_vio_dev(dev); 545 struct iommu_table *tbl; 546 547 tbl = get_iommu_table_base(dev); 548 dma_iommu_ops.unmap_page(dev, dma_handle, size, direction, attrs); 549 550 vio_cmo_dealloc(viodev, roundup(size, IOMMU_PAGE_SIZE(tbl))); 551} 552 553static int vio_dma_iommu_map_sg(struct device *dev, struct scatterlist *sglist, 554 int nelems, enum dma_data_direction direction, 555 struct dma_attrs *attrs) 556{ 557 struct vio_dev *viodev = to_vio_dev(dev); 558 struct iommu_table *tbl; 559 struct scatterlist *sgl; 560 int ret, count = 0; 561 size_t alloc_size = 0; 562 563 tbl = get_iommu_table_base(dev); 564 for (sgl = sglist; count < nelems; count++, sgl++) 565 alloc_size += roundup(sgl->length, IOMMU_PAGE_SIZE(tbl)); 566 567 if (vio_cmo_alloc(viodev, alloc_size)) { 568 atomic_inc(&viodev->cmo.allocs_failed); 569 return 0; 570 } 571 572 ret = dma_iommu_ops.map_sg(dev, sglist, nelems, direction, attrs); 573 574 if (unlikely(!ret)) { 575 vio_cmo_dealloc(viodev, alloc_size); 576 atomic_inc(&viodev->cmo.allocs_failed); 577 return ret; 578 } 579 580 for (sgl = sglist, count = 0; count < ret; count++, sgl++) 581 alloc_size -= roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl)); 582 if (alloc_size) 583 vio_cmo_dealloc(viodev, alloc_size); 584 585 return ret; 586} 587 588static void vio_dma_iommu_unmap_sg(struct device *dev, 589 struct scatterlist *sglist, int nelems, 590 enum dma_data_direction direction, 591 struct dma_attrs *attrs) 592{ 593 struct vio_dev *viodev = to_vio_dev(dev); 594 struct iommu_table *tbl; 595 struct scatterlist *sgl; 596 size_t alloc_size = 0; 597 int count = 0; 598 599 tbl = get_iommu_table_base(dev); 600 for (sgl = sglist; count < nelems; count++, sgl++) 601 alloc_size += roundup(sgl->dma_length, IOMMU_PAGE_SIZE(tbl)); 602 603 dma_iommu_ops.unmap_sg(dev, sglist, nelems, direction, attrs); 604 605 vio_cmo_dealloc(viodev, alloc_size); 606} 607 608static int vio_dma_iommu_dma_supported(struct device *dev, u64 mask) 609{ 610 return dma_iommu_ops.dma_supported(dev, mask); 611} 612 613static u64 vio_dma_get_required_mask(struct device *dev) 614{ 615 return dma_iommu_ops.get_required_mask(dev); 616} 617 618struct dma_map_ops vio_dma_mapping_ops = { 619 .alloc = vio_dma_iommu_alloc_coherent, 620 .free = vio_dma_iommu_free_coherent, 621 .mmap = dma_direct_mmap_coherent, 622 .map_sg = vio_dma_iommu_map_sg, 623 .unmap_sg = vio_dma_iommu_unmap_sg, 624 .map_page = vio_dma_iommu_map_page, 625 .unmap_page = vio_dma_iommu_unmap_page, 626 .dma_supported = vio_dma_iommu_dma_supported, 627 .get_required_mask = vio_dma_get_required_mask, 628}; 629 630/** 631 * vio_cmo_set_dev_desired - Set desired entitlement for a device 632 * 633 * @viodev: struct vio_dev for device to alter 634 * @desired: new desired entitlement level in bytes 635 * 636 * For use by devices to request a change to their entitlement at runtime or 637 * through sysfs. The desired entitlement level is changed and a balancing 638 * of system resources is scheduled to run in the future. 639 */ 640void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired) 641{ 642 unsigned long flags; 643 struct vio_cmo_dev_entry *dev_ent; 644 int found = 0; 645 646 if (!firmware_has_feature(FW_FEATURE_CMO)) 647 return; 648 649 spin_lock_irqsave(&vio_cmo.lock, flags); 650 if (desired < VIO_CMO_MIN_ENT) 651 desired = VIO_CMO_MIN_ENT; 652 653 /* 654 * Changes will not be made for devices not in the device list. 655 * If it is not in the device list, then no driver is loaded 656 * for the device and it can not receive entitlement. 657 */ 658 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) 659 if (viodev == dev_ent->viodev) { 660 found = 1; 661 break; 662 } 663 if (!found) { 664 spin_unlock_irqrestore(&vio_cmo.lock, flags); 665 return; 666 } 667 668 /* Increase/decrease in desired device entitlement */ 669 if (desired >= viodev->cmo.desired) { 670 /* Just bump the bus and device values prior to a balance*/ 671 vio_cmo.desired += desired - viodev->cmo.desired; 672 viodev->cmo.desired = desired; 673 } else { 674 /* Decrease bus and device values for desired entitlement */ 675 vio_cmo.desired -= viodev->cmo.desired - desired; 676 viodev->cmo.desired = desired; 677 /* 678 * If less entitlement is desired than current entitlement, move 679 * any reserve memory in the change region to the excess pool. 680 */ 681 if (viodev->cmo.entitled > desired) { 682 vio_cmo.reserve.size -= viodev->cmo.entitled - desired; 683 vio_cmo.excess.size += viodev->cmo.entitled - desired; 684 /* 685 * If entitlement moving from the reserve pool to the 686 * excess pool is currently unused, add to the excess 687 * free counter. 688 */ 689 if (viodev->cmo.allocated < viodev->cmo.entitled) 690 vio_cmo.excess.free += viodev->cmo.entitled - 691 max(viodev->cmo.allocated, desired); 692 viodev->cmo.entitled = desired; 693 } 694 } 695 schedule_delayed_work(&vio_cmo.balance_q, 0); 696 spin_unlock_irqrestore(&vio_cmo.lock, flags); 697} 698 699/** 700 * vio_cmo_bus_probe - Handle CMO specific bus probe activities 701 * 702 * @viodev - Pointer to struct vio_dev for device 703 * 704 * Determine the devices IO memory entitlement needs, attempting 705 * to satisfy the system minimum entitlement at first and scheduling 706 * a balance operation to take care of the rest at a later time. 707 * 708 * Returns: 0 on success, -EINVAL when device doesn't support CMO, and 709 * -ENOMEM when entitlement is not available for device or 710 * device entry. 711 * 712 */ 713static int vio_cmo_bus_probe(struct vio_dev *viodev) 714{ 715 struct vio_cmo_dev_entry *dev_ent; 716 struct device *dev = &viodev->dev; 717 struct iommu_table *tbl; 718 struct vio_driver *viodrv = to_vio_driver(dev->driver); 719 unsigned long flags; 720 size_t size; 721 bool dma_capable = false; 722 723 tbl = get_iommu_table_base(dev); 724 725 /* A device requires entitlement if it has a DMA window property */ 726 switch (viodev->family) { 727 case VDEVICE: 728 if (of_get_property(viodev->dev.of_node, 729 "ibm,my-dma-window", NULL)) 730 dma_capable = true; 731 break; 732 case PFO: 733 dma_capable = false; 734 break; 735 default: 736 dev_warn(dev, "unknown device family: %d\n", viodev->family); 737 BUG(); 738 break; 739 } 740 741 /* Configure entitlement for the device. */ 742 if (dma_capable) { 743 /* Check that the driver is CMO enabled and get desired DMA */ 744 if (!viodrv->get_desired_dma) { 745 dev_err(dev, "%s: device driver does not support CMO\n", 746 __func__); 747 return -EINVAL; 748 } 749 750 viodev->cmo.desired = 751 IOMMU_PAGE_ALIGN(viodrv->get_desired_dma(viodev), tbl); 752 if (viodev->cmo.desired < VIO_CMO_MIN_ENT) 753 viodev->cmo.desired = VIO_CMO_MIN_ENT; 754 size = VIO_CMO_MIN_ENT; 755 756 dev_ent = kmalloc(sizeof(struct vio_cmo_dev_entry), 757 GFP_KERNEL); 758 if (!dev_ent) 759 return -ENOMEM; 760 761 dev_ent->viodev = viodev; 762 spin_lock_irqsave(&vio_cmo.lock, flags); 763 list_add(&dev_ent->list, &vio_cmo.device_list); 764 } else { 765 viodev->cmo.desired = 0; 766 size = 0; 767 spin_lock_irqsave(&vio_cmo.lock, flags); 768 } 769 770 /* 771 * If the needs for vio_cmo.min have not changed since they 772 * were last set, the number of devices in the OF tree has 773 * been constant and the IO memory for this is already in 774 * the reserve pool. 775 */ 776 if (vio_cmo.min == ((vio_cmo_num_OF_devs() + 1) * 777 VIO_CMO_MIN_ENT)) { 778 /* Updated desired entitlement if device requires it */ 779 if (size) 780 vio_cmo.desired += (viodev->cmo.desired - 781 VIO_CMO_MIN_ENT); 782 } else { 783 size_t tmp; 784 785 tmp = vio_cmo.spare + vio_cmo.excess.free; 786 if (tmp < size) { 787 dev_err(dev, "%s: insufficient free " 788 "entitlement to add device. " 789 "Need %lu, have %lu\n", __func__, 790 size, (vio_cmo.spare + tmp)); 791 spin_unlock_irqrestore(&vio_cmo.lock, flags); 792 return -ENOMEM; 793 } 794 795 /* Use excess pool first to fulfill request */ 796 tmp = min(size, vio_cmo.excess.free); 797 vio_cmo.excess.free -= tmp; 798 vio_cmo.excess.size -= tmp; 799 vio_cmo.reserve.size += tmp; 800 801 /* Use spare if excess pool was insufficient */ 802 vio_cmo.spare -= size - tmp; 803 804 /* Update bus accounting */ 805 vio_cmo.min += size; 806 vio_cmo.desired += viodev->cmo.desired; 807 } 808 spin_unlock_irqrestore(&vio_cmo.lock, flags); 809 return 0; 810} 811 812/** 813 * vio_cmo_bus_remove - Handle CMO specific bus removal activities 814 * 815 * @viodev - Pointer to struct vio_dev for device 816 * 817 * Remove the device from the cmo device list. The minimum entitlement 818 * will be reserved for the device as long as it is in the system. The 819 * rest of the entitlement the device had been allocated will be returned 820 * to the system. 821 */ 822static void vio_cmo_bus_remove(struct vio_dev *viodev) 823{ 824 struct vio_cmo_dev_entry *dev_ent; 825 unsigned long flags; 826 size_t tmp; 827 828 spin_lock_irqsave(&vio_cmo.lock, flags); 829 if (viodev->cmo.allocated) { 830 dev_err(&viodev->dev, "%s: device had %lu bytes of IO " 831 "allocated after remove operation.\n", 832 __func__, viodev->cmo.allocated); 833 BUG(); 834 } 835 836 /* 837 * Remove the device from the device list being maintained for 838 * CMO enabled devices. 839 */ 840 list_for_each_entry(dev_ent, &vio_cmo.device_list, list) 841 if (viodev == dev_ent->viodev) { 842 list_del(&dev_ent->list); 843 kfree(dev_ent); 844 break; 845 } 846 847 /* 848 * Devices may not require any entitlement and they do not need 849 * to be processed. Otherwise, return the device's entitlement 850 * back to the pools. 851 */ 852 if (viodev->cmo.entitled) { 853 /* 854 * This device has not yet left the OF tree, it's 855 * minimum entitlement remains in vio_cmo.min and 856 * vio_cmo.desired 857 */ 858 vio_cmo.desired -= (viodev->cmo.desired - VIO_CMO_MIN_ENT); 859 860 /* 861 * Save min allocation for device in reserve as long 862 * as it exists in OF tree as determined by later 863 * balance operation 864 */ 865 viodev->cmo.entitled -= VIO_CMO_MIN_ENT; 866 867 /* Replenish spare from freed reserve pool */ 868 if (viodev->cmo.entitled && (vio_cmo.spare < VIO_CMO_MIN_ENT)) { 869 tmp = min(viodev->cmo.entitled, (VIO_CMO_MIN_ENT - 870 vio_cmo.spare)); 871 vio_cmo.spare += tmp; 872 viodev->cmo.entitled -= tmp; 873 } 874 875 /* Remaining reserve goes to excess pool */ 876 vio_cmo.excess.size += viodev->cmo.entitled; 877 vio_cmo.excess.free += viodev->cmo.entitled; 878 vio_cmo.reserve.size -= viodev->cmo.entitled; 879 880 /* 881 * Until the device is removed it will keep a 882 * minimum entitlement; this will guarantee that 883 * a module unload/load will result in a success. 884 */ 885 viodev->cmo.entitled = VIO_CMO_MIN_ENT; 886 viodev->cmo.desired = VIO_CMO_MIN_ENT; 887 atomic_set(&viodev->cmo.allocs_failed, 0); 888 } 889 890 spin_unlock_irqrestore(&vio_cmo.lock, flags); 891} 892 893static void vio_cmo_set_dma_ops(struct vio_dev *viodev) 894{ 895 set_dma_ops(&viodev->dev, &vio_dma_mapping_ops); 896} 897 898/** 899 * vio_cmo_bus_init - CMO entitlement initialization at bus init time 900 * 901 * Set up the reserve and excess entitlement pools based on available 902 * system entitlement and the number of devices in the OF tree that 903 * require entitlement in the reserve pool. 904 */ 905static void vio_cmo_bus_init(void) 906{ 907 struct hvcall_mpp_data mpp_data; 908 int err; 909 910 memset(&vio_cmo, 0, sizeof(struct vio_cmo)); 911 spin_lock_init(&vio_cmo.lock); 912 INIT_LIST_HEAD(&vio_cmo.device_list); 913 INIT_DELAYED_WORK(&vio_cmo.balance_q, vio_cmo_balance); 914 915 /* Get current system entitlement */ 916 err = h_get_mpp(&mpp_data); 917 918 /* 919 * On failure, continue with entitlement set to 0, will panic() 920 * later when spare is reserved. 921 */ 922 if (err != H_SUCCESS) { 923 printk(KERN_ERR "%s: unable to determine system IO "\ 924 "entitlement. (%d)\n", __func__, err); 925 vio_cmo.entitled = 0; 926 } else { 927 vio_cmo.entitled = mpp_data.entitled_mem; 928 } 929 930 /* Set reservation and check against entitlement */ 931 vio_cmo.spare = VIO_CMO_MIN_ENT; 932 vio_cmo.reserve.size = vio_cmo.spare; 933 vio_cmo.reserve.size += (vio_cmo_num_OF_devs() * 934 VIO_CMO_MIN_ENT); 935 if (vio_cmo.reserve.size > vio_cmo.entitled) { 936 printk(KERN_ERR "%s: insufficient system entitlement\n", 937 __func__); 938 panic("%s: Insufficient system entitlement", __func__); 939 } 940 941 /* Set the remaining accounting variables */ 942 vio_cmo.excess.size = vio_cmo.entitled - vio_cmo.reserve.size; 943 vio_cmo.excess.free = vio_cmo.excess.size; 944 vio_cmo.min = vio_cmo.reserve.size; 945 vio_cmo.desired = vio_cmo.reserve.size; 946} 947 948/* sysfs device functions and data structures for CMO */ 949 950#define viodev_cmo_rd_attr(name) \ 951static ssize_t viodev_cmo_##name##_show(struct device *dev, \ 952 struct device_attribute *attr, \ 953 char *buf) \ 954{ \ 955 return sprintf(buf, "%lu\n", to_vio_dev(dev)->cmo.name); \ 956} 957 958static ssize_t viodev_cmo_allocs_failed_show(struct device *dev, 959 struct device_attribute *attr, char *buf) 960{ 961 struct vio_dev *viodev = to_vio_dev(dev); 962 return sprintf(buf, "%d\n", atomic_read(&viodev->cmo.allocs_failed)); 963} 964 965static ssize_t viodev_cmo_allocs_failed_reset(struct device *dev, 966 struct device_attribute *attr, const char *buf, size_t count) 967{ 968 struct vio_dev *viodev = to_vio_dev(dev); 969 atomic_set(&viodev->cmo.allocs_failed, 0); 970 return count; 971} 972 973static ssize_t viodev_cmo_desired_set(struct device *dev, 974 struct device_attribute *attr, const char *buf, size_t count) 975{ 976 struct vio_dev *viodev = to_vio_dev(dev); 977 size_t new_desired; 978 int ret; 979 980 ret = kstrtoul(buf, 10, &new_desired); 981 if (ret) 982 return ret; 983 984 vio_cmo_set_dev_desired(viodev, new_desired); 985 return count; 986} 987 988viodev_cmo_rd_attr(desired); 989viodev_cmo_rd_attr(entitled); 990viodev_cmo_rd_attr(allocated); 991 992static ssize_t name_show(struct device *, struct device_attribute *, char *); 993static ssize_t devspec_show(struct device *, struct device_attribute *, char *); 994static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, 995 char *buf); 996static struct device_attribute vio_cmo_dev_attrs[] = { 997 __ATTR_RO(name), 998 __ATTR_RO(devspec), 999 __ATTR_RO(modalias), 1000 __ATTR(cmo_desired, S_IWUSR|S_IRUSR|S_IWGRP|S_IRGRP|S_IROTH, 1001 viodev_cmo_desired_show, viodev_cmo_desired_set), 1002 __ATTR(cmo_entitled, S_IRUGO, viodev_cmo_entitled_show, NULL), 1003 __ATTR(cmo_allocated, S_IRUGO, viodev_cmo_allocated_show, NULL), 1004 __ATTR(cmo_allocs_failed, S_IWUSR|S_IRUSR|S_IWGRP|S_IRGRP|S_IROTH, 1005 viodev_cmo_allocs_failed_show, viodev_cmo_allocs_failed_reset), 1006 __ATTR_NULL 1007}; 1008 1009/* sysfs bus functions and data structures for CMO */ 1010 1011#define viobus_cmo_rd_attr(name) \ 1012static ssize_t cmo_##name##_show(struct bus_type *bt, char *buf) \ 1013{ \ 1014 return sprintf(buf, "%lu\n", vio_cmo.name); \ 1015} \ 1016static BUS_ATTR_RO(cmo_##name) 1017 1018#define viobus_cmo_pool_rd_attr(name, var) \ 1019static ssize_t \ 1020cmo_##name##_##var##_show(struct bus_type *bt, char *buf) \ 1021{ \ 1022 return sprintf(buf, "%lu\n", vio_cmo.name.var); \ 1023} \ 1024static BUS_ATTR_RO(cmo_##name##_##var) 1025 1026viobus_cmo_rd_attr(entitled); 1027viobus_cmo_rd_attr(spare); 1028viobus_cmo_rd_attr(min); 1029viobus_cmo_rd_attr(desired); 1030viobus_cmo_rd_attr(curr); 1031viobus_cmo_pool_rd_attr(reserve, size); 1032viobus_cmo_pool_rd_attr(excess, size); 1033viobus_cmo_pool_rd_attr(excess, free); 1034 1035static ssize_t cmo_high_show(struct bus_type *bt, char *buf) 1036{ 1037 return sprintf(buf, "%lu\n", vio_cmo.high); 1038} 1039 1040static ssize_t cmo_high_store(struct bus_type *bt, const char *buf, 1041 size_t count) 1042{ 1043 unsigned long flags; 1044 1045 spin_lock_irqsave(&vio_cmo.lock, flags); 1046 vio_cmo.high = vio_cmo.curr; 1047 spin_unlock_irqrestore(&vio_cmo.lock, flags); 1048 1049 return count; 1050} 1051static BUS_ATTR_RW(cmo_high); 1052 1053static struct attribute *vio_bus_attrs[] = { 1054 &bus_attr_cmo_entitled.attr, 1055 &bus_attr_cmo_spare.attr, 1056 &bus_attr_cmo_min.attr, 1057 &bus_attr_cmo_desired.attr, 1058 &bus_attr_cmo_curr.attr, 1059 &bus_attr_cmo_high.attr, 1060 &bus_attr_cmo_reserve_size.attr, 1061 &bus_attr_cmo_excess_size.attr, 1062 &bus_attr_cmo_excess_free.attr, 1063 NULL, 1064}; 1065ATTRIBUTE_GROUPS(vio_bus); 1066 1067static void vio_cmo_sysfs_init(void) 1068{ 1069 vio_bus_type.dev_attrs = vio_cmo_dev_attrs; 1070 vio_bus_type.bus_groups = vio_bus_groups; 1071} 1072#else /* CONFIG_PPC_SMLPAR */ 1073int vio_cmo_entitlement_update(size_t new_entitlement) { return 0; } 1074void vio_cmo_set_dev_desired(struct vio_dev *viodev, size_t desired) {} 1075static int vio_cmo_bus_probe(struct vio_dev *viodev) { return 0; } 1076static void vio_cmo_bus_remove(struct vio_dev *viodev) {} 1077static void vio_cmo_set_dma_ops(struct vio_dev *viodev) {} 1078static void vio_cmo_bus_init(void) {} 1079static void vio_cmo_sysfs_init(void) { } 1080#endif /* CONFIG_PPC_SMLPAR */ 1081EXPORT_SYMBOL(vio_cmo_entitlement_update); 1082EXPORT_SYMBOL(vio_cmo_set_dev_desired); 1083 1084 1085/* 1086 * Platform Facilities Option (PFO) support 1087 */ 1088 1089/** 1090 * vio_h_cop_sync - Perform a synchronous PFO co-processor operation 1091 * 1092 * @vdev - Pointer to a struct vio_dev for device 1093 * @op - Pointer to a struct vio_pfo_op for the operation parameters 1094 * 1095 * Calls the hypervisor to synchronously perform the PFO operation 1096 * described in @op. In the case of a busy response from the hypervisor, 1097 * the operation will be re-submitted indefinitely unless a non-zero timeout 1098 * is specified or an error occurs. The timeout places a limit on when to 1099 * stop re-submitting a operation, the total time can be exceeded if an 1100 * operation is in progress. 1101 * 1102 * If op->hcall_ret is not NULL, this will be set to the return from the 1103 * last h_cop_op call or it will be 0 if an error not involving the h_call 1104 * was encountered. 1105 * 1106 * Returns: 1107 * 0 on success, 1108 * -EINVAL if the h_call fails due to an invalid parameter, 1109 * -E2BIG if the h_call can not be performed synchronously, 1110 * -EBUSY if a timeout is specified and has elapsed, 1111 * -EACCES if the memory area for data/status has been rescinded, or 1112 * -EPERM if a hardware fault has been indicated 1113 */ 1114int vio_h_cop_sync(struct vio_dev *vdev, struct vio_pfo_op *op) 1115{ 1116 struct device *dev = &vdev->dev; 1117 unsigned long deadline = 0; 1118 long hret = 0; 1119 int ret = 0; 1120 1121 if (op->timeout) 1122 deadline = jiffies + msecs_to_jiffies(op->timeout); 1123 1124 while (true) { 1125 hret = plpar_hcall_norets(H_COP, op->flags, 1126 vdev->resource_id, 1127 op->in, op->inlen, op->out, 1128 op->outlen, op->csbcpb); 1129 1130 if (hret == H_SUCCESS || 1131 (hret != H_NOT_ENOUGH_RESOURCES && 1132 hret != H_BUSY && hret != H_RESOURCE) || 1133 (op->timeout && time_after(deadline, jiffies))) 1134 break; 1135 1136 dev_dbg(dev, "%s: hcall ret(%ld), retrying.\n", __func__, hret); 1137 } 1138 1139 switch (hret) { 1140 case H_SUCCESS: 1141 ret = 0; 1142 break; 1143 case H_OP_MODE: 1144 case H_TOO_BIG: 1145 ret = -E2BIG; 1146 break; 1147 case H_RESCINDED: 1148 ret = -EACCES; 1149 break; 1150 case H_HARDWARE: 1151 ret = -EPERM; 1152 break; 1153 case H_NOT_ENOUGH_RESOURCES: 1154 case H_RESOURCE: 1155 case H_BUSY: 1156 ret = -EBUSY; 1157 break; 1158 default: 1159 ret = -EINVAL; 1160 break; 1161 } 1162 1163 if (ret) 1164 dev_dbg(dev, "%s: Sync h_cop_op failure (ret:%d) (hret:%ld)\n", 1165 __func__, ret, hret); 1166 1167 op->hcall_err = hret; 1168 return ret; 1169} 1170EXPORT_SYMBOL(vio_h_cop_sync); 1171 1172static struct iommu_table *vio_build_iommu_table(struct vio_dev *dev) 1173{ 1174 const __be32 *dma_window; 1175 struct iommu_table *tbl; 1176 unsigned long offset, size; 1177 1178 dma_window = of_get_property(dev->dev.of_node, 1179 "ibm,my-dma-window", NULL); 1180 if (!dma_window) 1181 return NULL; 1182 1183 tbl = kzalloc(sizeof(*tbl), GFP_KERNEL); 1184 if (tbl == NULL) 1185 return NULL; 1186 1187 of_parse_dma_window(dev->dev.of_node, dma_window, 1188 &tbl->it_index, &offset, &size); 1189 1190 /* TCE table size - measured in tce entries */ 1191 tbl->it_page_shift = IOMMU_PAGE_SHIFT_4K; 1192 tbl->it_size = size >> tbl->it_page_shift; 1193 /* offset for VIO should always be 0 */ 1194 tbl->it_offset = offset >> tbl->it_page_shift; 1195 tbl->it_busno = 0; 1196 tbl->it_type = TCE_VB; 1197 tbl->it_blocksize = 16; 1198 1199 return iommu_init_table(tbl, -1); 1200} 1201 1202/** 1203 * vio_match_device: - Tell if a VIO device has a matching 1204 * VIO device id structure. 1205 * @ids: array of VIO device id structures to search in 1206 * @dev: the VIO device structure to match against 1207 * 1208 * Used by a driver to check whether a VIO device present in the 1209 * system is in its list of supported devices. Returns the matching 1210 * vio_device_id structure or NULL if there is no match. 1211 */ 1212static const struct vio_device_id *vio_match_device( 1213 const struct vio_device_id *ids, const struct vio_dev *dev) 1214{ 1215 while (ids->type[0] != '\0') { 1216 if ((strncmp(dev->type, ids->type, strlen(ids->type)) == 0) && 1217 of_device_is_compatible(dev->dev.of_node, 1218 ids->compat)) 1219 return ids; 1220 ids++; 1221 } 1222 return NULL; 1223} 1224 1225/* 1226 * Convert from struct device to struct vio_dev and pass to driver. 1227 * dev->driver has already been set by generic code because vio_bus_match 1228 * succeeded. 1229 */ 1230static int vio_bus_probe(struct device *dev) 1231{ 1232 struct vio_dev *viodev = to_vio_dev(dev); 1233 struct vio_driver *viodrv = to_vio_driver(dev->driver); 1234 const struct vio_device_id *id; 1235 int error = -ENODEV; 1236 1237 if (!viodrv->probe) 1238 return error; 1239 1240 id = vio_match_device(viodrv->id_table, viodev); 1241 if (id) { 1242 memset(&viodev->cmo, 0, sizeof(viodev->cmo)); 1243 if (firmware_has_feature(FW_FEATURE_CMO)) { 1244 error = vio_cmo_bus_probe(viodev); 1245 if (error) 1246 return error; 1247 } 1248 error = viodrv->probe(viodev, id); 1249 if (error && firmware_has_feature(FW_FEATURE_CMO)) 1250 vio_cmo_bus_remove(viodev); 1251 } 1252 1253 return error; 1254} 1255 1256/* convert from struct device to struct vio_dev and pass to driver. */ 1257static int vio_bus_remove(struct device *dev) 1258{ 1259 struct vio_dev *viodev = to_vio_dev(dev); 1260 struct vio_driver *viodrv = to_vio_driver(dev->driver); 1261 struct device *devptr; 1262 int ret = 1; 1263 1264 /* 1265 * Hold a reference to the device after the remove function is called 1266 * to allow for CMO accounting cleanup for the device. 1267 */ 1268 devptr = get_device(dev); 1269 1270 if (viodrv->remove) 1271 ret = viodrv->remove(viodev); 1272 1273 if (!ret && firmware_has_feature(FW_FEATURE_CMO)) 1274 vio_cmo_bus_remove(viodev); 1275 1276 put_device(devptr); 1277 return ret; 1278} 1279 1280/** 1281 * vio_register_driver: - Register a new vio driver 1282 * @viodrv: The vio_driver structure to be registered. 1283 */ 1284int __vio_register_driver(struct vio_driver *viodrv, struct module *owner, 1285 const char *mod_name) 1286{ 1287 pr_debug("%s: driver %s registering\n", __func__, viodrv->name); 1288 1289 /* fill in 'struct driver' fields */ 1290 viodrv->driver.name = viodrv->name; 1291 viodrv->driver.pm = viodrv->pm; 1292 viodrv->driver.bus = &vio_bus_type; 1293 viodrv->driver.owner = owner; 1294 viodrv->driver.mod_name = mod_name; 1295 1296 return driver_register(&viodrv->driver); 1297} 1298EXPORT_SYMBOL(__vio_register_driver); 1299 1300/** 1301 * vio_unregister_driver - Remove registration of vio driver. 1302 * @viodrv: The vio_driver struct to be removed form registration 1303 */ 1304void vio_unregister_driver(struct vio_driver *viodrv) 1305{ 1306 driver_unregister(&viodrv->driver); 1307} 1308EXPORT_SYMBOL(vio_unregister_driver); 1309 1310/* vio_dev refcount hit 0 */ 1311static void vio_dev_release(struct device *dev) 1312{ 1313 struct iommu_table *tbl = get_iommu_table_base(dev); 1314 1315 if (tbl) 1316 iommu_free_table(tbl, of_node_full_name(dev->of_node)); 1317 of_node_put(dev->of_node); 1318 kfree(to_vio_dev(dev)); 1319} 1320 1321/** 1322 * vio_register_device_node: - Register a new vio device. 1323 * @of_node: The OF node for this device. 1324 * 1325 * Creates and initializes a vio_dev structure from the data in 1326 * of_node and adds it to the list of virtual devices. 1327 * Returns a pointer to the created vio_dev or NULL if node has 1328 * NULL device_type or compatible fields. 1329 */ 1330struct vio_dev *vio_register_device_node(struct device_node *of_node) 1331{ 1332 struct vio_dev *viodev; 1333 struct device_node *parent_node; 1334 const __be32 *prop; 1335 enum vio_dev_family family; 1336 const char *of_node_name = of_node->name ? of_node->name : "<unknown>"; 1337 1338 /* 1339 * Determine if this node is a under the /vdevice node or under the 1340 * /ibm,platform-facilities node. This decides the device's family. 1341 */ 1342 parent_node = of_get_parent(of_node); 1343 if (parent_node) { 1344 if (!strcmp(parent_node->full_name, "/ibm,platform-facilities")) 1345 family = PFO; 1346 else if (!strcmp(parent_node->full_name, "/vdevice")) 1347 family = VDEVICE; 1348 else { 1349 pr_warn("%s: parent(%s) of %s not recognized.\n", 1350 __func__, 1351 parent_node->full_name, 1352 of_node_name); 1353 of_node_put(parent_node); 1354 return NULL; 1355 } 1356 of_node_put(parent_node); 1357 } else { 1358 pr_warn("%s: could not determine the parent of node %s.\n", 1359 __func__, of_node_name); 1360 return NULL; 1361 } 1362 1363 if (family == PFO) { 1364 if (of_get_property(of_node, "interrupt-controller", NULL)) { 1365 pr_debug("%s: Skipping the interrupt controller %s.\n", 1366 __func__, of_node_name); 1367 return NULL; 1368 } 1369 } 1370 1371 /* allocate a vio_dev for this node */ 1372 viodev = kzalloc(sizeof(struct vio_dev), GFP_KERNEL); 1373 if (viodev == NULL) { 1374 pr_warn("%s: allocation failure for VIO device.\n", __func__); 1375 return NULL; 1376 } 1377 1378 /* we need the 'device_type' property, in order to match with drivers */ 1379 viodev->family = family; 1380 if (viodev->family == VDEVICE) { 1381 unsigned int unit_address; 1382 1383 if (of_node->type != NULL) 1384 viodev->type = of_node->type; 1385 else { 1386 pr_warn("%s: node %s is missing the 'device_type' " 1387 "property.\n", __func__, of_node_name); 1388 goto out; 1389 } 1390 1391 prop = of_get_property(of_node, "reg", NULL); 1392 if (prop == NULL) { 1393 pr_warn("%s: node %s missing 'reg'\n", 1394 __func__, of_node_name); 1395 goto out; 1396 } 1397 unit_address = of_read_number(prop, 1); 1398 dev_set_name(&viodev->dev, "%x", unit_address); 1399 viodev->irq = irq_of_parse_and_map(of_node, 0); 1400 viodev->unit_address = unit_address; 1401 } else { 1402 /* PFO devices need their resource_id for submitting COP_OPs 1403 * This is an optional field for devices, but is required when 1404 * performing synchronous ops */ 1405 prop = of_get_property(of_node, "ibm,resource-id", NULL); 1406 if (prop != NULL) 1407 viodev->resource_id = of_read_number(prop, 1); 1408 1409 dev_set_name(&viodev->dev, "%s", of_node_name); 1410 viodev->type = of_node_name; 1411 viodev->irq = 0; 1412 } 1413 1414 viodev->name = of_node->name; 1415 viodev->dev.of_node = of_node_get(of_node); 1416 1417 set_dev_node(&viodev->dev, of_node_to_nid(of_node)); 1418 1419 /* init generic 'struct device' fields: */ 1420 viodev->dev.parent = &vio_bus_device.dev; 1421 viodev->dev.bus = &vio_bus_type; 1422 viodev->dev.release = vio_dev_release; 1423 1424 if (of_get_property(viodev->dev.of_node, "ibm,my-dma-window", NULL)) { 1425 if (firmware_has_feature(FW_FEATURE_CMO)) 1426 vio_cmo_set_dma_ops(viodev); 1427 else 1428 set_dma_ops(&viodev->dev, &dma_iommu_ops); 1429 1430 set_iommu_table_base(&viodev->dev, 1431 vio_build_iommu_table(viodev)); 1432 1433 /* needed to ensure proper operation of coherent allocations 1434 * later, in case driver doesn't set it explicitly */ 1435 viodev->dev.coherent_dma_mask = DMA_BIT_MASK(64); 1436 viodev->dev.dma_mask = &viodev->dev.coherent_dma_mask; 1437 } 1438 1439 /* register with generic device framework */ 1440 if (device_register(&viodev->dev)) { 1441 printk(KERN_ERR "%s: failed to register device %s\n", 1442 __func__, dev_name(&viodev->dev)); 1443 put_device(&viodev->dev); 1444 return NULL; 1445 } 1446 1447 return viodev; 1448 1449out: /* Use this exit point for any return prior to device_register */ 1450 kfree(viodev); 1451 1452 return NULL; 1453} 1454EXPORT_SYMBOL(vio_register_device_node); 1455 1456/* 1457 * vio_bus_scan_for_devices - Scan OF and register each child device 1458 * @root_name - OF node name for the root of the subtree to search. 1459 * This must be non-NULL 1460 * 1461 * Starting from the root node provide, register the device node for 1462 * each child beneath the root. 1463 */ 1464static void vio_bus_scan_register_devices(char *root_name) 1465{ 1466 struct device_node *node_root, *node_child; 1467 1468 if (!root_name) 1469 return; 1470 1471 node_root = of_find_node_by_name(NULL, root_name); 1472 if (node_root) { 1473 1474 /* 1475 * Create struct vio_devices for each virtual device in 1476 * the device tree. Drivers will associate with them later. 1477 */ 1478 node_child = of_get_next_child(node_root, NULL); 1479 while (node_child) { 1480 vio_register_device_node(node_child); 1481 node_child = of_get_next_child(node_root, node_child); 1482 } 1483 of_node_put(node_root); 1484 } 1485} 1486 1487/** 1488 * vio_bus_init: - Initialize the virtual IO bus 1489 */ 1490static int __init vio_bus_init(void) 1491{ 1492 int err; 1493 1494 if (firmware_has_feature(FW_FEATURE_CMO)) 1495 vio_cmo_sysfs_init(); 1496 1497 err = bus_register(&vio_bus_type); 1498 if (err) { 1499 printk(KERN_ERR "failed to register VIO bus\n"); 1500 return err; 1501 } 1502 1503 /* 1504 * The fake parent of all vio devices, just to give us 1505 * a nice directory 1506 */ 1507 err = device_register(&vio_bus_device.dev); 1508 if (err) { 1509 printk(KERN_WARNING "%s: device_register returned %i\n", 1510 __func__, err); 1511 return err; 1512 } 1513 1514 if (firmware_has_feature(FW_FEATURE_CMO)) 1515 vio_cmo_bus_init(); 1516 1517 return 0; 1518} 1519postcore_initcall(vio_bus_init); 1520 1521static int __init vio_device_init(void) 1522{ 1523 vio_bus_scan_register_devices("vdevice"); 1524 vio_bus_scan_register_devices("ibm,platform-facilities"); 1525 1526 return 0; 1527} 1528device_initcall(vio_device_init); 1529 1530static ssize_t name_show(struct device *dev, 1531 struct device_attribute *attr, char *buf) 1532{ 1533 return sprintf(buf, "%s\n", to_vio_dev(dev)->name); 1534} 1535 1536static ssize_t devspec_show(struct device *dev, 1537 struct device_attribute *attr, char *buf) 1538{ 1539 struct device_node *of_node = dev->of_node; 1540 1541 return sprintf(buf, "%s\n", of_node_full_name(of_node)); 1542} 1543 1544static ssize_t modalias_show(struct device *dev, struct device_attribute *attr, 1545 char *buf) 1546{ 1547 const struct vio_dev *vio_dev = to_vio_dev(dev); 1548 struct device_node *dn; 1549 const char *cp; 1550 1551 dn = dev->of_node; 1552 if (!dn) { 1553 strcpy(buf, "\n"); 1554 return strlen(buf); 1555 } 1556 cp = of_get_property(dn, "compatible", NULL); 1557 if (!cp) { 1558 strcpy(buf, "\n"); 1559 return strlen(buf); 1560 } 1561 1562 return sprintf(buf, "vio:T%sS%s\n", vio_dev->type, cp); 1563} 1564 1565static struct device_attribute vio_dev_attrs[] = { 1566 __ATTR_RO(name), 1567 __ATTR_RO(devspec), 1568 __ATTR_RO(modalias), 1569 __ATTR_NULL 1570}; 1571 1572void vio_unregister_device(struct vio_dev *viodev) 1573{ 1574 device_unregister(&viodev->dev); 1575} 1576EXPORT_SYMBOL(vio_unregister_device); 1577 1578static int vio_bus_match(struct device *dev, struct device_driver *drv) 1579{ 1580 const struct vio_dev *vio_dev = to_vio_dev(dev); 1581 struct vio_driver *vio_drv = to_vio_driver(drv); 1582 const struct vio_device_id *ids = vio_drv->id_table; 1583 1584 return (ids != NULL) && (vio_match_device(ids, vio_dev) != NULL); 1585} 1586 1587static int vio_hotplug(struct device *dev, struct kobj_uevent_env *env) 1588{ 1589 const struct vio_dev *vio_dev = to_vio_dev(dev); 1590 struct device_node *dn; 1591 const char *cp; 1592 1593 dn = dev->of_node; 1594 if (!dn) 1595 return -ENODEV; 1596 cp = of_get_property(dn, "compatible", NULL); 1597 if (!cp) 1598 return -ENODEV; 1599 1600 add_uevent_var(env, "MODALIAS=vio:T%sS%s", vio_dev->type, cp); 1601 return 0; 1602} 1603 1604struct bus_type vio_bus_type = { 1605 .name = "vio", 1606 .dev_attrs = vio_dev_attrs, 1607 .uevent = vio_hotplug, 1608 .match = vio_bus_match, 1609 .probe = vio_bus_probe, 1610 .remove = vio_bus_remove, 1611}; 1612 1613/** 1614 * vio_get_attribute: - get attribute for virtual device 1615 * @vdev: The vio device to get property. 1616 * @which: The property/attribute to be extracted. 1617 * @length: Pointer to length of returned data size (unused if NULL). 1618 * 1619 * Calls prom.c's of_get_property() to return the value of the 1620 * attribute specified by @which 1621*/ 1622const void *vio_get_attribute(struct vio_dev *vdev, char *which, int *length) 1623{ 1624 return of_get_property(vdev->dev.of_node, which, length); 1625} 1626EXPORT_SYMBOL(vio_get_attribute); 1627 1628#ifdef CONFIG_PPC_PSERIES 1629/* vio_find_name() - internal because only vio.c knows how we formatted the 1630 * kobject name 1631 */ 1632static struct vio_dev *vio_find_name(const char *name) 1633{ 1634 struct device *found; 1635 1636 found = bus_find_device_by_name(&vio_bus_type, NULL, name); 1637 if (!found) 1638 return NULL; 1639 1640 return to_vio_dev(found); 1641} 1642 1643/** 1644 * vio_find_node - find an already-registered vio_dev 1645 * @vnode: device_node of the virtual device we're looking for 1646 */ 1647struct vio_dev *vio_find_node(struct device_node *vnode) 1648{ 1649 char kobj_name[20]; 1650 struct device_node *vnode_parent; 1651 const char *dev_type; 1652 1653 vnode_parent = of_get_parent(vnode); 1654 if (!vnode_parent) 1655 return NULL; 1656 1657 dev_type = of_get_property(vnode_parent, "device_type", NULL); 1658 of_node_put(vnode_parent); 1659 if (!dev_type) 1660 return NULL; 1661 1662 /* construct the kobject name from the device node */ 1663 if (!strcmp(dev_type, "vdevice")) { 1664 const __be32 *prop; 1665 1666 prop = of_get_property(vnode, "reg", NULL); 1667 if (!prop) 1668 return NULL; 1669 snprintf(kobj_name, sizeof(kobj_name), "%x", 1670 (uint32_t)of_read_number(prop, 1)); 1671 } else if (!strcmp(dev_type, "ibm,platform-facilities")) 1672 snprintf(kobj_name, sizeof(kobj_name), "%s", vnode->name); 1673 else 1674 return NULL; 1675 1676 return vio_find_name(kobj_name); 1677} 1678EXPORT_SYMBOL(vio_find_node); 1679 1680int vio_enable_interrupts(struct vio_dev *dev) 1681{ 1682 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_ENABLE); 1683 if (rc != H_SUCCESS) 1684 printk(KERN_ERR "vio: Error 0x%x enabling interrupts\n", rc); 1685 return rc; 1686} 1687EXPORT_SYMBOL(vio_enable_interrupts); 1688 1689int vio_disable_interrupts(struct vio_dev *dev) 1690{ 1691 int rc = h_vio_signal(dev->unit_address, VIO_IRQ_DISABLE); 1692 if (rc != H_SUCCESS) 1693 printk(KERN_ERR "vio: Error 0x%x disabling interrupts\n", rc); 1694 return rc; 1695} 1696EXPORT_SYMBOL(vio_disable_interrupts); 1697#endif /* CONFIG_PPC_PSERIES */ 1698