1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause) 2 /* 3 * Copyright 2013-2016 Freescale Semiconductor Inc. 4 * Copyright 2016-2017,2019-2020 NXP 5 */ 6 7 #include <linux/device.h> 8 #include <linux/iommu.h> 9 #include <linux/module.h> 10 #include <linux/mutex.h> 11 #include <linux/slab.h> 12 #include <linux/types.h> 13 #include <linux/vfio.h> 14 #include <linux/fsl/mc.h> 15 #include <linux/delay.h> 16 #include <linux/io-64-nonatomic-hi-lo.h> 17 18 #include "vfio_fsl_mc_private.h" 19 20 static struct fsl_mc_driver vfio_fsl_mc_driver; 21 22 static int vfio_fsl_mc_open_device(struct vfio_device *core_vdev) 23 { 24 struct vfio_fsl_mc_device *vdev = 25 container_of(core_vdev, struct vfio_fsl_mc_device, vdev); 26 struct fsl_mc_device *mc_dev = vdev->mc_dev; 27 int count = mc_dev->obj_desc.region_count; 28 int i; 29 30 vdev->regions = kcalloc(count, sizeof(struct vfio_fsl_mc_region), 31 GFP_KERNEL_ACCOUNT); 32 if (!vdev->regions) 33 return -ENOMEM; 34 35 for (i = 0; i < count; i++) { 36 struct resource *res = &mc_dev->regions[i]; 37 int no_mmap = is_fsl_mc_bus_dprc(mc_dev); 38 39 vdev->regions[i].addr = res->start; 40 vdev->regions[i].size = resource_size(res); 41 vdev->regions[i].type = mc_dev->regions[i].flags & IORESOURCE_BITS; 42 /* 43 * Only regions addressed with PAGE granularity may be 44 * MMAPed securely. 45 */ 46 if (!no_mmap && !(vdev->regions[i].addr & ~PAGE_MASK) && 47 !(vdev->regions[i].size & ~PAGE_MASK)) 48 vdev->regions[i].flags |= 49 VFIO_REGION_INFO_FLAG_MMAP; 50 vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_READ; 51 if (!(mc_dev->regions[i].flags & IORESOURCE_READONLY)) 52 vdev->regions[i].flags |= VFIO_REGION_INFO_FLAG_WRITE; 53 } 54 55 return 0; 56 } 57 58 static void vfio_fsl_mc_regions_cleanup(struct vfio_fsl_mc_device *vdev) 59 { 60 struct fsl_mc_device *mc_dev = vdev->mc_dev; 61 int i; 62 63 for (i = 0; i < mc_dev->obj_desc.region_count; i++) 64 iounmap(vdev->regions[i].ioaddr); 65 kfree(vdev->regions); 66 } 67 68 static int vfio_fsl_mc_reset_device(struct vfio_fsl_mc_device *vdev) 69 { 70 struct fsl_mc_device *mc_dev = vdev->mc_dev; 71 int ret = 0; 72 73 if (is_fsl_mc_bus_dprc(vdev->mc_dev)) { 74 return dprc_reset_container(mc_dev->mc_io, 0, 75 mc_dev->mc_handle, 76 mc_dev->obj_desc.id, 77 DPRC_RESET_OPTION_NON_RECURSIVE); 78 } else { 79 u16 token; 80 81 ret = fsl_mc_obj_open(mc_dev->mc_io, 0, mc_dev->obj_desc.id, 82 mc_dev->obj_desc.type, 83 &token); 84 if (ret) 85 goto out; 86 ret = fsl_mc_obj_reset(mc_dev->mc_io, 0, token); 87 if (ret) { 88 fsl_mc_obj_close(mc_dev->mc_io, 0, token); 89 goto out; 90 } 91 ret = fsl_mc_obj_close(mc_dev->mc_io, 0, token); 92 } 93 out: 94 return ret; 95 } 96 97 static void vfio_fsl_mc_close_device(struct vfio_device *core_vdev) 98 { 99 struct vfio_fsl_mc_device *vdev = 100 container_of(core_vdev, struct vfio_fsl_mc_device, vdev); 101 struct fsl_mc_device *mc_dev = vdev->mc_dev; 102 struct device *cont_dev = fsl_mc_cont_dev(&mc_dev->dev); 103 struct fsl_mc_device *mc_cont = to_fsl_mc_device(cont_dev); 104 int ret; 105 106 vfio_fsl_mc_regions_cleanup(vdev); 107 108 /* reset the device before cleaning up the interrupts */ 109 ret = vfio_fsl_mc_reset_device(vdev); 110 111 if (ret) 112 dev_warn(&mc_cont->dev, 113 "VFIO_FSL_MC: reset device has failed (%d)\n", ret); 114 115 vfio_fsl_mc_irqs_cleanup(vdev); 116 117 fsl_mc_cleanup_irq_pool(mc_cont); 118 } 119 120 static long vfio_fsl_mc_ioctl(struct vfio_device *core_vdev, 121 unsigned int cmd, unsigned long arg) 122 { 123 unsigned long minsz; 124 struct vfio_fsl_mc_device *vdev = 125 container_of(core_vdev, struct vfio_fsl_mc_device, vdev); 126 struct fsl_mc_device *mc_dev = vdev->mc_dev; 127 128 switch (cmd) { 129 case VFIO_DEVICE_GET_INFO: 130 { 131 struct vfio_device_info info; 132 133 minsz = offsetofend(struct vfio_device_info, num_irqs); 134 135 if (copy_from_user(&info, (void __user *)arg, minsz)) 136 return -EFAULT; 137 138 if (info.argsz < minsz) 139 return -EINVAL; 140 141 info.flags = VFIO_DEVICE_FLAGS_FSL_MC; 142 143 if (is_fsl_mc_bus_dprc(mc_dev)) 144 info.flags |= VFIO_DEVICE_FLAGS_RESET; 145 146 info.num_regions = mc_dev->obj_desc.region_count; 147 info.num_irqs = mc_dev->obj_desc.irq_count; 148 149 return copy_to_user((void __user *)arg, &info, minsz) ? 150 -EFAULT : 0; 151 } 152 case VFIO_DEVICE_GET_REGION_INFO: 153 { 154 struct vfio_region_info info; 155 156 minsz = offsetofend(struct vfio_region_info, offset); 157 158 if (copy_from_user(&info, (void __user *)arg, minsz)) 159 return -EFAULT; 160 161 if (info.argsz < minsz) 162 return -EINVAL; 163 164 if (info.index >= mc_dev->obj_desc.region_count) 165 return -EINVAL; 166 167 /* map offset to the physical address */ 168 info.offset = VFIO_FSL_MC_INDEX_TO_OFFSET(info.index); 169 info.size = vdev->regions[info.index].size; 170 info.flags = vdev->regions[info.index].flags; 171 172 if (copy_to_user((void __user *)arg, &info, minsz)) 173 return -EFAULT; 174 return 0; 175 } 176 case VFIO_DEVICE_GET_IRQ_INFO: 177 { 178 struct vfio_irq_info info; 179 180 minsz = offsetofend(struct vfio_irq_info, count); 181 if (copy_from_user(&info, (void __user *)arg, minsz)) 182 return -EFAULT; 183 184 if (info.argsz < minsz) 185 return -EINVAL; 186 187 if (info.index >= mc_dev->obj_desc.irq_count) 188 return -EINVAL; 189 190 info.flags = VFIO_IRQ_INFO_EVENTFD; 191 info.count = 1; 192 193 if (copy_to_user((void __user *)arg, &info, minsz)) 194 return -EFAULT; 195 return 0; 196 } 197 case VFIO_DEVICE_SET_IRQS: 198 { 199 struct vfio_irq_set hdr; 200 u8 *data = NULL; 201 int ret = 0; 202 size_t data_size = 0; 203 204 minsz = offsetofend(struct vfio_irq_set, count); 205 206 if (copy_from_user(&hdr, (void __user *)arg, minsz)) 207 return -EFAULT; 208 209 ret = vfio_set_irqs_validate_and_prepare(&hdr, mc_dev->obj_desc.irq_count, 210 mc_dev->obj_desc.irq_count, &data_size); 211 if (ret) 212 return ret; 213 214 if (data_size) { 215 data = memdup_user((void __user *)(arg + minsz), 216 data_size); 217 if (IS_ERR(data)) 218 return PTR_ERR(data); 219 } 220 221 mutex_lock(&vdev->igate); 222 ret = vfio_fsl_mc_set_irqs_ioctl(vdev, hdr.flags, 223 hdr.index, hdr.start, 224 hdr.count, data); 225 mutex_unlock(&vdev->igate); 226 kfree(data); 227 228 return ret; 229 } 230 case VFIO_DEVICE_RESET: 231 { 232 return vfio_fsl_mc_reset_device(vdev); 233 234 } 235 default: 236 return -ENOTTY; 237 } 238 } 239 240 static ssize_t vfio_fsl_mc_read(struct vfio_device *core_vdev, char __user *buf, 241 size_t count, loff_t *ppos) 242 { 243 struct vfio_fsl_mc_device *vdev = 244 container_of(core_vdev, struct vfio_fsl_mc_device, vdev); 245 unsigned int index = VFIO_FSL_MC_OFFSET_TO_INDEX(*ppos); 246 loff_t off = *ppos & VFIO_FSL_MC_OFFSET_MASK; 247 struct fsl_mc_device *mc_dev = vdev->mc_dev; 248 struct vfio_fsl_mc_region *region; 249 u64 data[8]; 250 int i; 251 252 if (index >= mc_dev->obj_desc.region_count) 253 return -EINVAL; 254 255 region = &vdev->regions[index]; 256 257 if (!(region->flags & VFIO_REGION_INFO_FLAG_READ)) 258 return -EINVAL; 259 260 if (!region->ioaddr) { 261 region->ioaddr = ioremap(region->addr, region->size); 262 if (!region->ioaddr) 263 return -ENOMEM; 264 } 265 266 if (count != 64 || off != 0) 267 return -EINVAL; 268 269 for (i = 7; i >= 0; i--) 270 data[i] = readq(region->ioaddr + i * sizeof(uint64_t)); 271 272 if (copy_to_user(buf, data, 64)) 273 return -EFAULT; 274 275 return count; 276 } 277 278 #define MC_CMD_COMPLETION_TIMEOUT_MS 5000 279 #define MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS 500 280 281 static int vfio_fsl_mc_send_command(void __iomem *ioaddr, uint64_t *cmd_data) 282 { 283 int i; 284 enum mc_cmd_status status; 285 unsigned long timeout_usecs = MC_CMD_COMPLETION_TIMEOUT_MS * 1000; 286 287 /* Write at command parameter into portal */ 288 for (i = 7; i >= 1; i--) 289 writeq_relaxed(cmd_data[i], ioaddr + i * sizeof(uint64_t)); 290 291 /* Write command header in the end */ 292 writeq(cmd_data[0], ioaddr); 293 294 /* Wait for response before returning to user-space 295 * This can be optimized in future to even prepare response 296 * before returning to user-space and avoid read ioctl. 297 */ 298 for (;;) { 299 u64 header; 300 struct mc_cmd_header *resp_hdr; 301 302 header = cpu_to_le64(readq_relaxed(ioaddr)); 303 304 resp_hdr = (struct mc_cmd_header *)&header; 305 status = (enum mc_cmd_status)resp_hdr->status; 306 if (status != MC_CMD_STATUS_READY) 307 break; 308 309 udelay(MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS); 310 timeout_usecs -= MC_CMD_COMPLETION_POLLING_MAX_SLEEP_USECS; 311 if (timeout_usecs == 0) 312 return -ETIMEDOUT; 313 } 314 315 return 0; 316 } 317 318 static ssize_t vfio_fsl_mc_write(struct vfio_device *core_vdev, 319 const char __user *buf, size_t count, 320 loff_t *ppos) 321 { 322 struct vfio_fsl_mc_device *vdev = 323 container_of(core_vdev, struct vfio_fsl_mc_device, vdev); 324 unsigned int index = VFIO_FSL_MC_OFFSET_TO_INDEX(*ppos); 325 loff_t off = *ppos & VFIO_FSL_MC_OFFSET_MASK; 326 struct fsl_mc_device *mc_dev = vdev->mc_dev; 327 struct vfio_fsl_mc_region *region; 328 u64 data[8]; 329 int ret; 330 331 if (index >= mc_dev->obj_desc.region_count) 332 return -EINVAL; 333 334 region = &vdev->regions[index]; 335 336 if (!(region->flags & VFIO_REGION_INFO_FLAG_WRITE)) 337 return -EINVAL; 338 339 if (!region->ioaddr) { 340 region->ioaddr = ioremap(region->addr, region->size); 341 if (!region->ioaddr) 342 return -ENOMEM; 343 } 344 345 if (count != 64 || off != 0) 346 return -EINVAL; 347 348 if (copy_from_user(&data, buf, 64)) 349 return -EFAULT; 350 351 ret = vfio_fsl_mc_send_command(region->ioaddr, data); 352 if (ret) 353 return ret; 354 355 return count; 356 357 } 358 359 static int vfio_fsl_mc_mmap_mmio(struct vfio_fsl_mc_region region, 360 struct vm_area_struct *vma) 361 { 362 u64 size = vma->vm_end - vma->vm_start; 363 u64 pgoff, base; 364 u8 region_cacheable; 365 366 pgoff = vma->vm_pgoff & 367 ((1U << (VFIO_FSL_MC_OFFSET_SHIFT - PAGE_SHIFT)) - 1); 368 base = pgoff << PAGE_SHIFT; 369 370 if (region.size < PAGE_SIZE || base + size > region.size) 371 return -EINVAL; 372 373 region_cacheable = (region.type & FSL_MC_REGION_CACHEABLE) && 374 (region.type & FSL_MC_REGION_SHAREABLE); 375 if (!region_cacheable) 376 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 377 378 vma->vm_pgoff = (region.addr >> PAGE_SHIFT) + pgoff; 379 380 return remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff, 381 size, vma->vm_page_prot); 382 } 383 384 static int vfio_fsl_mc_mmap(struct vfio_device *core_vdev, 385 struct vm_area_struct *vma) 386 { 387 struct vfio_fsl_mc_device *vdev = 388 container_of(core_vdev, struct vfio_fsl_mc_device, vdev); 389 struct fsl_mc_device *mc_dev = vdev->mc_dev; 390 unsigned int index; 391 392 index = vma->vm_pgoff >> (VFIO_FSL_MC_OFFSET_SHIFT - PAGE_SHIFT); 393 394 if (vma->vm_end < vma->vm_start) 395 return -EINVAL; 396 if (vma->vm_start & ~PAGE_MASK) 397 return -EINVAL; 398 if (vma->vm_end & ~PAGE_MASK) 399 return -EINVAL; 400 if (!(vma->vm_flags & VM_SHARED)) 401 return -EINVAL; 402 if (index >= mc_dev->obj_desc.region_count) 403 return -EINVAL; 404 405 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_MMAP)) 406 return -EINVAL; 407 408 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_READ) 409 && (vma->vm_flags & VM_READ)) 410 return -EINVAL; 411 412 if (!(vdev->regions[index].flags & VFIO_REGION_INFO_FLAG_WRITE) 413 && (vma->vm_flags & VM_WRITE)) 414 return -EINVAL; 415 416 vma->vm_private_data = mc_dev; 417 418 return vfio_fsl_mc_mmap_mmio(vdev->regions[index], vma); 419 } 420 421 static const struct vfio_device_ops vfio_fsl_mc_ops; 422 static int vfio_fsl_mc_bus_notifier(struct notifier_block *nb, 423 unsigned long action, void *data) 424 { 425 struct vfio_fsl_mc_device *vdev = container_of(nb, 426 struct vfio_fsl_mc_device, nb); 427 struct device *dev = data; 428 struct fsl_mc_device *mc_dev = to_fsl_mc_device(dev); 429 struct fsl_mc_device *mc_cont = to_fsl_mc_device(mc_dev->dev.parent); 430 431 if (action == BUS_NOTIFY_ADD_DEVICE && 432 vdev->mc_dev == mc_cont) { 433 mc_dev->driver_override = kasprintf(GFP_KERNEL, "%s", 434 vfio_fsl_mc_ops.name); 435 if (!mc_dev->driver_override) 436 dev_warn(dev, "VFIO_FSL_MC: Setting driver override for device in dprc %s failed\n", 437 dev_name(&mc_cont->dev)); 438 else 439 dev_info(dev, "VFIO_FSL_MC: Setting driver override for device in dprc %s\n", 440 dev_name(&mc_cont->dev)); 441 } else if (action == BUS_NOTIFY_BOUND_DRIVER && 442 vdev->mc_dev == mc_cont) { 443 struct fsl_mc_driver *mc_drv = to_fsl_mc_driver(dev->driver); 444 445 if (mc_drv && mc_drv != &vfio_fsl_mc_driver) 446 dev_warn(dev, "VFIO_FSL_MC: Object %s bound to driver %s while DPRC bound to vfio-fsl-mc\n", 447 dev_name(dev), mc_drv->driver.name); 448 } 449 450 return 0; 451 } 452 453 static int vfio_fsl_mc_init_device(struct vfio_fsl_mc_device *vdev) 454 { 455 struct fsl_mc_device *mc_dev = vdev->mc_dev; 456 int ret; 457 458 /* Non-dprc devices share mc_io from parent */ 459 if (!is_fsl_mc_bus_dprc(mc_dev)) { 460 struct fsl_mc_device *mc_cont = to_fsl_mc_device(mc_dev->dev.parent); 461 462 mc_dev->mc_io = mc_cont->mc_io; 463 return 0; 464 } 465 466 vdev->nb.notifier_call = vfio_fsl_mc_bus_notifier; 467 ret = bus_register_notifier(&fsl_mc_bus_type, &vdev->nb); 468 if (ret) 469 return ret; 470 471 /* open DPRC, allocate a MC portal */ 472 ret = dprc_setup(mc_dev); 473 if (ret) { 474 dev_err(&mc_dev->dev, "VFIO_FSL_MC: Failed to setup DPRC (%d)\n", ret); 475 goto out_nc_unreg; 476 } 477 return 0; 478 479 out_nc_unreg: 480 bus_unregister_notifier(&fsl_mc_bus_type, &vdev->nb); 481 return ret; 482 } 483 484 static int vfio_fsl_mc_scan_container(struct fsl_mc_device *mc_dev) 485 { 486 int ret; 487 488 /* non dprc devices do not scan for other devices */ 489 if (!is_fsl_mc_bus_dprc(mc_dev)) 490 return 0; 491 ret = dprc_scan_container(mc_dev, false); 492 if (ret) { 493 dev_err(&mc_dev->dev, 494 "VFIO_FSL_MC: Container scanning failed (%d)\n", ret); 495 dprc_remove_devices(mc_dev, NULL, 0); 496 return ret; 497 } 498 return 0; 499 } 500 501 static void vfio_fsl_uninit_device(struct vfio_fsl_mc_device *vdev) 502 { 503 struct fsl_mc_device *mc_dev = vdev->mc_dev; 504 505 if (!is_fsl_mc_bus_dprc(mc_dev)) 506 return; 507 508 dprc_cleanup(mc_dev); 509 bus_unregister_notifier(&fsl_mc_bus_type, &vdev->nb); 510 } 511 512 static int vfio_fsl_mc_init_dev(struct vfio_device *core_vdev) 513 { 514 struct vfio_fsl_mc_device *vdev = 515 container_of(core_vdev, struct vfio_fsl_mc_device, vdev); 516 struct fsl_mc_device *mc_dev = to_fsl_mc_device(core_vdev->dev); 517 int ret; 518 519 vdev->mc_dev = mc_dev; 520 mutex_init(&vdev->igate); 521 522 if (is_fsl_mc_bus_dprc(mc_dev)) 523 ret = vfio_assign_device_set(core_vdev, &mc_dev->dev); 524 else 525 ret = vfio_assign_device_set(core_vdev, mc_dev->dev.parent); 526 527 if (ret) 528 return ret; 529 530 /* device_set is released by vfio core if @init fails */ 531 return vfio_fsl_mc_init_device(vdev); 532 } 533 534 static int vfio_fsl_mc_probe(struct fsl_mc_device *mc_dev) 535 { 536 struct vfio_fsl_mc_device *vdev; 537 struct device *dev = &mc_dev->dev; 538 int ret; 539 540 vdev = vfio_alloc_device(vfio_fsl_mc_device, vdev, dev, 541 &vfio_fsl_mc_ops); 542 if (IS_ERR(vdev)) 543 return PTR_ERR(vdev); 544 545 ret = vfio_register_group_dev(&vdev->vdev); 546 if (ret) { 547 dev_err(dev, "VFIO_FSL_MC: Failed to add to vfio group\n"); 548 goto out_put_vdev; 549 } 550 551 ret = vfio_fsl_mc_scan_container(mc_dev); 552 if (ret) 553 goto out_group_dev; 554 dev_set_drvdata(dev, vdev); 555 return 0; 556 557 out_group_dev: 558 vfio_unregister_group_dev(&vdev->vdev); 559 out_put_vdev: 560 vfio_put_device(&vdev->vdev); 561 return ret; 562 } 563 564 static void vfio_fsl_mc_release_dev(struct vfio_device *core_vdev) 565 { 566 struct vfio_fsl_mc_device *vdev = 567 container_of(core_vdev, struct vfio_fsl_mc_device, vdev); 568 569 vfio_fsl_uninit_device(vdev); 570 mutex_destroy(&vdev->igate); 571 } 572 573 static void vfio_fsl_mc_remove(struct fsl_mc_device *mc_dev) 574 { 575 struct device *dev = &mc_dev->dev; 576 struct vfio_fsl_mc_device *vdev = dev_get_drvdata(dev); 577 578 vfio_unregister_group_dev(&vdev->vdev); 579 dprc_remove_devices(mc_dev, NULL, 0); 580 vfio_put_device(&vdev->vdev); 581 } 582 583 static const struct vfio_device_ops vfio_fsl_mc_ops = { 584 .name = "vfio-fsl-mc", 585 .init = vfio_fsl_mc_init_dev, 586 .release = vfio_fsl_mc_release_dev, 587 .open_device = vfio_fsl_mc_open_device, 588 .close_device = vfio_fsl_mc_close_device, 589 .ioctl = vfio_fsl_mc_ioctl, 590 .read = vfio_fsl_mc_read, 591 .write = vfio_fsl_mc_write, 592 .mmap = vfio_fsl_mc_mmap, 593 .bind_iommufd = vfio_iommufd_physical_bind, 594 .unbind_iommufd = vfio_iommufd_physical_unbind, 595 .attach_ioas = vfio_iommufd_physical_attach_ioas, 596 .detach_ioas = vfio_iommufd_physical_detach_ioas, 597 }; 598 599 static struct fsl_mc_driver vfio_fsl_mc_driver = { 600 .probe = vfio_fsl_mc_probe, 601 .remove = vfio_fsl_mc_remove, 602 .driver = { 603 .name = "vfio-fsl-mc", 604 }, 605 .driver_managed_dma = true, 606 }; 607 608 module_fsl_mc_driver(vfio_fsl_mc_driver); 609 610 MODULE_LICENSE("Dual BSD/GPL"); 611 MODULE_DESCRIPTION("VFIO for FSL-MC devices - User Level meta-driver"); 612