Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 1 | /* |
| 2 | * VFIO: IOMMU DMA mapping support for Type1 IOMMU |
| 3 | * |
| 4 | * Copyright (C) 2012 Red Hat, Inc. All rights reserved. |
| 5 | * Author: Alex Williamson <alex.williamson@redhat.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | * |
| 11 | * Derived from original vfio: |
| 12 | * Copyright 2010 Cisco Systems, Inc. All rights reserved. |
| 13 | * Author: Tom Lyon, pugs@cisco.com |
| 14 | * |
| 15 | * We arbitrarily define a Type1 IOMMU as one matching the below code. |
| 16 | * It could be called the x86 IOMMU as it's designed for AMD-Vi & Intel |
| 17 | * VT-d, but that makes it harder to re-use as theoretically anyone |
| 18 | * implementing a similar IOMMU could make use of this. We expect the |
| 19 | * IOMMU to support the IOMMU API and have few to no restrictions around |
| 20 | * the IOVA range that can be mapped. The Type1 IOMMU is currently |
| 21 | * optimized for relatively static mappings of a userspace process with |
| 22 | * userpsace pages pinned into memory. We also assume devices and IOMMU |
| 23 | * domains are PCI based as the IOMMU API is still centered around a |
| 24 | * device/bus interface rather than a group interface. |
| 25 | */ |
| 26 | |
| 27 | #include <linux/compat.h> |
| 28 | #include <linux/device.h> |
| 29 | #include <linux/fs.h> |
| 30 | #include <linux/iommu.h> |
| 31 | #include <linux/module.h> |
| 32 | #include <linux/mm.h> |
| 33 | #include <linux/pci.h> /* pci_bus_type */ |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 34 | #include <linux/rbtree.h> |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 35 | #include <linux/sched.h> |
| 36 | #include <linux/slab.h> |
| 37 | #include <linux/uaccess.h> |
| 38 | #include <linux/vfio.h> |
| 39 | #include <linux/workqueue.h> |
| 40 | |
| 41 | #define DRIVER_VERSION "0.2" |
| 42 | #define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>" |
| 43 | #define DRIVER_DESC "Type1 IOMMU driver for VFIO" |
| 44 | |
| 45 | static bool allow_unsafe_interrupts; |
| 46 | module_param_named(allow_unsafe_interrupts, |
| 47 | allow_unsafe_interrupts, bool, S_IRUGO | S_IWUSR); |
| 48 | MODULE_PARM_DESC(allow_unsafe_interrupts, |
| 49 | "Enable VFIO IOMMU support for on platforms without interrupt remapping support."); |
| 50 | |
| 51 | struct vfio_iommu { |
| 52 | struct iommu_domain *domain; |
| 53 | struct mutex lock; |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 54 | struct rb_root dma_list; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 55 | struct list_head group_list; |
| 56 | bool cache; |
| 57 | }; |
| 58 | |
| 59 | struct vfio_dma { |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 60 | struct rb_node node; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 61 | dma_addr_t iova; /* Device address */ |
| 62 | unsigned long vaddr; /* Process virtual addr */ |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 63 | size_t size; /* Map size (bytes) */ |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 64 | int prot; /* IOMMU_READ/WRITE */ |
| 65 | }; |
| 66 | |
| 67 | struct vfio_group { |
| 68 | struct iommu_group *iommu_group; |
| 69 | struct list_head next; |
| 70 | }; |
| 71 | |
| 72 | /* |
| 73 | * This code handles mapping and unmapping of user data buffers |
| 74 | * into DMA'ble space using the IOMMU |
| 75 | */ |
| 76 | |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 77 | static struct vfio_dma *vfio_find_dma(struct vfio_iommu *iommu, |
| 78 | dma_addr_t start, size_t size) |
| 79 | { |
| 80 | struct rb_node *node = iommu->dma_list.rb_node; |
| 81 | |
| 82 | while (node) { |
| 83 | struct vfio_dma *dma = rb_entry(node, struct vfio_dma, node); |
| 84 | |
| 85 | if (start + size <= dma->iova) |
| 86 | node = node->rb_left; |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 87 | else if (start >= dma->iova + dma->size) |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 88 | node = node->rb_right; |
| 89 | else |
| 90 | return dma; |
| 91 | } |
| 92 | |
| 93 | return NULL; |
| 94 | } |
| 95 | |
| 96 | static void vfio_insert_dma(struct vfio_iommu *iommu, struct vfio_dma *new) |
| 97 | { |
| 98 | struct rb_node **link = &iommu->dma_list.rb_node, *parent = NULL; |
| 99 | struct vfio_dma *dma; |
| 100 | |
| 101 | while (*link) { |
| 102 | parent = *link; |
| 103 | dma = rb_entry(parent, struct vfio_dma, node); |
| 104 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 105 | if (new->iova + new->size <= dma->iova) |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 106 | link = &(*link)->rb_left; |
| 107 | else |
| 108 | link = &(*link)->rb_right; |
| 109 | } |
| 110 | |
| 111 | rb_link_node(&new->node, parent, link); |
| 112 | rb_insert_color(&new->node, &iommu->dma_list); |
| 113 | } |
| 114 | |
| 115 | static void vfio_remove_dma(struct vfio_iommu *iommu, struct vfio_dma *old) |
| 116 | { |
| 117 | rb_erase(&old->node, &iommu->dma_list); |
| 118 | } |
| 119 | |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 120 | struct vwork { |
| 121 | struct mm_struct *mm; |
| 122 | long npage; |
| 123 | struct work_struct work; |
| 124 | }; |
| 125 | |
| 126 | /* delayed decrement/increment for locked_vm */ |
| 127 | static void vfio_lock_acct_bg(struct work_struct *work) |
| 128 | { |
| 129 | struct vwork *vwork = container_of(work, struct vwork, work); |
| 130 | struct mm_struct *mm; |
| 131 | |
| 132 | mm = vwork->mm; |
| 133 | down_write(&mm->mmap_sem); |
| 134 | mm->locked_vm += vwork->npage; |
| 135 | up_write(&mm->mmap_sem); |
| 136 | mmput(mm); |
| 137 | kfree(vwork); |
| 138 | } |
| 139 | |
| 140 | static void vfio_lock_acct(long npage) |
| 141 | { |
| 142 | struct vwork *vwork; |
| 143 | struct mm_struct *mm; |
| 144 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 145 | if (!current->mm || !npage) |
| 146 | return; /* process exited or nothing to do */ |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 147 | |
| 148 | if (down_write_trylock(¤t->mm->mmap_sem)) { |
| 149 | current->mm->locked_vm += npage; |
| 150 | up_write(¤t->mm->mmap_sem); |
| 151 | return; |
| 152 | } |
| 153 | |
| 154 | /* |
| 155 | * Couldn't get mmap_sem lock, so must setup to update |
| 156 | * mm->locked_vm later. If locked_vm were atomic, we |
| 157 | * wouldn't need this silliness |
| 158 | */ |
| 159 | vwork = kmalloc(sizeof(struct vwork), GFP_KERNEL); |
| 160 | if (!vwork) |
| 161 | return; |
| 162 | mm = get_task_mm(current); |
| 163 | if (!mm) { |
| 164 | kfree(vwork); |
| 165 | return; |
| 166 | } |
| 167 | INIT_WORK(&vwork->work, vfio_lock_acct_bg); |
| 168 | vwork->mm = mm; |
| 169 | vwork->npage = npage; |
| 170 | schedule_work(&vwork->work); |
| 171 | } |
| 172 | |
| 173 | /* |
| 174 | * Some mappings aren't backed by a struct page, for example an mmap'd |
| 175 | * MMIO range for our own or another device. These use a different |
| 176 | * pfn conversion and shouldn't be tracked as locked pages. |
| 177 | */ |
| 178 | static bool is_invalid_reserved_pfn(unsigned long pfn) |
| 179 | { |
| 180 | if (pfn_valid(pfn)) { |
| 181 | bool reserved; |
| 182 | struct page *tail = pfn_to_page(pfn); |
| 183 | struct page *head = compound_trans_head(tail); |
| 184 | reserved = !!(PageReserved(head)); |
| 185 | if (head != tail) { |
| 186 | /* |
| 187 | * "head" is not a dangling pointer |
| 188 | * (compound_trans_head takes care of that) |
| 189 | * but the hugepage may have been split |
| 190 | * from under us (and we may not hold a |
| 191 | * reference count on the head page so it can |
| 192 | * be reused before we run PageReferenced), so |
| 193 | * we've to check PageTail before returning |
| 194 | * what we just read. |
| 195 | */ |
| 196 | smp_rmb(); |
| 197 | if (PageTail(tail)) |
| 198 | return reserved; |
| 199 | } |
| 200 | return PageReserved(tail); |
| 201 | } |
| 202 | |
| 203 | return true; |
| 204 | } |
| 205 | |
| 206 | static int put_pfn(unsigned long pfn, int prot) |
| 207 | { |
| 208 | if (!is_invalid_reserved_pfn(pfn)) { |
| 209 | struct page *page = pfn_to_page(pfn); |
| 210 | if (prot & IOMMU_WRITE) |
| 211 | SetPageDirty(page); |
| 212 | put_page(page); |
| 213 | return 1; |
| 214 | } |
| 215 | return 0; |
| 216 | } |
| 217 | |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 218 | static int vaddr_get_pfn(unsigned long vaddr, int prot, unsigned long *pfn) |
| 219 | { |
| 220 | struct page *page[1]; |
| 221 | struct vm_area_struct *vma; |
| 222 | int ret = -EFAULT; |
| 223 | |
| 224 | if (get_user_pages_fast(vaddr, 1, !!(prot & IOMMU_WRITE), page) == 1) { |
| 225 | *pfn = page_to_pfn(page[0]); |
| 226 | return 0; |
| 227 | } |
| 228 | |
| 229 | down_read(¤t->mm->mmap_sem); |
| 230 | |
| 231 | vma = find_vma_intersection(current->mm, vaddr, vaddr + 1); |
| 232 | |
| 233 | if (vma && vma->vm_flags & VM_PFNMAP) { |
| 234 | *pfn = ((vaddr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; |
| 235 | if (is_invalid_reserved_pfn(*pfn)) |
| 236 | ret = 0; |
| 237 | } |
| 238 | |
| 239 | up_read(¤t->mm->mmap_sem); |
| 240 | |
| 241 | return ret; |
| 242 | } |
| 243 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 244 | /* |
| 245 | * Attempt to pin pages. We really don't want to track all the pfns and |
| 246 | * the iommu can only map chunks of consecutive pfns anyway, so get the |
| 247 | * first page and all consecutive pages with the same locking. |
| 248 | */ |
| 249 | static long vfio_pin_pages(unsigned long vaddr, long npage, |
| 250 | int prot, unsigned long *pfn_base) |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 251 | { |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 252 | unsigned long limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; |
| 253 | bool lock_cap = capable(CAP_IPC_LOCK); |
| 254 | long ret, i; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 255 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 256 | if (!current->mm) |
| 257 | return -ENODEV; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 258 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 259 | ret = vaddr_get_pfn(vaddr, prot, pfn_base); |
| 260 | if (ret) |
| 261 | return ret; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 262 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 263 | if (is_invalid_reserved_pfn(*pfn_base)) |
| 264 | return 1; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 265 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 266 | if (!lock_cap && current->mm->locked_vm + 1 > limit) { |
| 267 | put_pfn(*pfn_base, prot); |
| 268 | pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n", __func__, |
| 269 | limit << PAGE_SHIFT); |
| 270 | return -ENOMEM; |
| 271 | } |
| 272 | |
| 273 | /* Lock all the consecutive pages from pfn_base */ |
| 274 | for (i = 1, vaddr += PAGE_SIZE; i < npage; i++, vaddr += PAGE_SIZE) { |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 275 | unsigned long pfn = 0; |
| 276 | |
| 277 | ret = vaddr_get_pfn(vaddr, prot, &pfn); |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 278 | if (ret) |
| 279 | break; |
| 280 | |
| 281 | if (pfn != *pfn_base + i || is_invalid_reserved_pfn(pfn)) { |
| 282 | put_pfn(pfn, prot); |
| 283 | break; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 284 | } |
| 285 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 286 | if (!lock_cap && current->mm->locked_vm + i + 1 > limit) { |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 287 | put_pfn(pfn, prot); |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 288 | pr_warn("%s: RLIMIT_MEMLOCK (%ld) exceeded\n", |
| 289 | __func__, limit << PAGE_SHIFT); |
| 290 | break; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 291 | } |
| 292 | } |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 293 | |
| 294 | vfio_lock_acct(i); |
| 295 | |
| 296 | return i; |
| 297 | } |
| 298 | |
| 299 | static long vfio_unpin_pages(unsigned long pfn, long npage, |
| 300 | int prot, bool do_accounting) |
| 301 | { |
| 302 | unsigned long unlocked = 0; |
| 303 | long i; |
| 304 | |
| 305 | for (i = 0; i < npage; i++) |
| 306 | unlocked += put_pfn(pfn++, prot); |
| 307 | |
| 308 | if (do_accounting) |
| 309 | vfio_lock_acct(-unlocked); |
| 310 | |
| 311 | return unlocked; |
| 312 | } |
| 313 | |
| 314 | static int vfio_unmap_unpin(struct vfio_iommu *iommu, struct vfio_dma *dma, |
| 315 | dma_addr_t iova, size_t *size) |
| 316 | { |
| 317 | dma_addr_t start = iova, end = iova + *size; |
| 318 | long unlocked = 0; |
| 319 | |
| 320 | while (iova < end) { |
| 321 | size_t unmapped; |
| 322 | phys_addr_t phys; |
| 323 | |
| 324 | /* |
| 325 | * We use the IOMMU to track the physical address. This |
| 326 | * saves us from having a lot more entries in our mapping |
| 327 | * tree. The downside is that we don't track the size |
| 328 | * used to do the mapping. We request unmap of a single |
| 329 | * page, but expect IOMMUs that support large pages to |
| 330 | * unmap a larger chunk. |
| 331 | */ |
| 332 | phys = iommu_iova_to_phys(iommu->domain, iova); |
| 333 | if (WARN_ON(!phys)) { |
| 334 | iova += PAGE_SIZE; |
| 335 | continue; |
| 336 | } |
| 337 | |
| 338 | unmapped = iommu_unmap(iommu->domain, iova, PAGE_SIZE); |
| 339 | if (!unmapped) |
| 340 | break; |
| 341 | |
| 342 | unlocked += vfio_unpin_pages(phys >> PAGE_SHIFT, |
| 343 | unmapped >> PAGE_SHIFT, |
| 344 | dma->prot, false); |
| 345 | iova += unmapped; |
| 346 | } |
| 347 | |
| 348 | vfio_lock_acct(-unlocked); |
| 349 | |
| 350 | *size = iova - start; |
| 351 | |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 352 | return 0; |
| 353 | } |
| 354 | |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 355 | static int vfio_remove_dma_overlap(struct vfio_iommu *iommu, dma_addr_t start, |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 356 | size_t *size, struct vfio_dma *dma) |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 357 | { |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 358 | size_t offset, overlap, tmp; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 359 | struct vfio_dma *split; |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 360 | int ret; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 361 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 362 | /* |
| 363 | * Existing dma region is completely covered, unmap all. This is |
| 364 | * the likely case since userspace tends to map and unmap buffers |
| 365 | * in one shot rather than multiple mappings within a buffer. |
| 366 | */ |
| 367 | if (likely(start <= dma->iova && |
| 368 | start + *size >= dma->iova + dma->size)) { |
| 369 | *size = dma->size; |
| 370 | ret = vfio_unmap_unpin(iommu, dma, dma->iova, size); |
| 371 | if (ret) |
| 372 | return ret; |
| 373 | |
| 374 | /* |
| 375 | * Did we remove more than we have? Should never happen |
| 376 | * since a vfio_dma is contiguous in iova and vaddr. |
| 377 | */ |
| 378 | WARN_ON(*size != dma->size); |
| 379 | |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 380 | vfio_remove_dma(iommu, dma); |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 381 | kfree(dma); |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 382 | return 0; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 383 | } |
| 384 | |
| 385 | /* Overlap low address of existing range */ |
| 386 | if (start <= dma->iova) { |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 387 | overlap = start + *size - dma->iova; |
| 388 | ret = vfio_unmap_unpin(iommu, dma, dma->iova, &overlap); |
| 389 | if (ret) |
| 390 | return ret; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 391 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 392 | vfio_remove_dma(iommu, dma); |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 393 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 394 | /* |
| 395 | * Check, we may have removed to whole vfio_dma. If not |
| 396 | * fixup and re-insert. |
| 397 | */ |
| 398 | if (overlap < dma->size) { |
| 399 | dma->iova += overlap; |
| 400 | dma->vaddr += overlap; |
| 401 | dma->size -= overlap; |
| 402 | vfio_insert_dma(iommu, dma); |
| 403 | } |
| 404 | *size = overlap; |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 405 | return 0; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 406 | } |
| 407 | |
| 408 | /* Overlap high address of existing range */ |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 409 | if (start + *size >= dma->iova + dma->size) { |
| 410 | offset = start - dma->iova; |
| 411 | overlap = dma->size - offset; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 412 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 413 | ret = vfio_unmap_unpin(iommu, dma, start, &overlap); |
| 414 | if (ret) |
| 415 | return ret; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 416 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 417 | /* |
| 418 | * We may have unmapped the entire vfio_dma if the user is |
| 419 | * trying to unmap a sub-region of what was originally |
| 420 | * mapped. If anything left, we can resize in place since |
| 421 | * iova is unchanged. |
| 422 | */ |
| 423 | if (overlap < dma->size) |
| 424 | dma->size -= overlap; |
| 425 | else |
| 426 | vfio_remove_dma(iommu, dma); |
| 427 | |
| 428 | *size = overlap; |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 429 | return 0; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 430 | } |
| 431 | |
| 432 | /* Split existing */ |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 433 | offset = start - dma->iova; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 434 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 435 | ret = vfio_unmap_unpin(iommu, dma, start, size); |
| 436 | if (ret) |
| 437 | return ret; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 438 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 439 | WARN_ON(!*size); |
| 440 | tmp = dma->size; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 441 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 442 | /* |
| 443 | * Resize the lower vfio_dma in place, insert new for remaining |
| 444 | * upper segment. |
| 445 | */ |
| 446 | dma->size = offset; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 447 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 448 | if (offset + *size < tmp) { |
| 449 | split = kzalloc(sizeof(*split), GFP_KERNEL); |
| 450 | if (!split) |
| 451 | return -ENOMEM; |
| 452 | |
| 453 | split->size = tmp - offset - *size; |
| 454 | split->iova = dma->iova + offset + *size; |
| 455 | split->vaddr = dma->vaddr + offset + *size; |
| 456 | split->prot = dma->prot; |
| 457 | vfio_insert_dma(iommu, split); |
| 458 | } |
| 459 | |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 460 | return 0; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 461 | } |
| 462 | |
| 463 | static int vfio_dma_do_unmap(struct vfio_iommu *iommu, |
| 464 | struct vfio_iommu_type1_dma_unmap *unmap) |
| 465 | { |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 466 | uint64_t mask; |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 467 | struct vfio_dma *dma; |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 468 | size_t unmapped = 0, size; |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 469 | int ret = 0; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 470 | |
| 471 | mask = ((uint64_t)1 << __ffs(iommu->domain->ops->pgsize_bitmap)) - 1; |
| 472 | |
| 473 | if (unmap->iova & mask) |
| 474 | return -EINVAL; |
| 475 | if (unmap->size & mask) |
| 476 | return -EINVAL; |
| 477 | |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 478 | WARN_ON(mask & PAGE_MASK); |
| 479 | |
| 480 | mutex_lock(&iommu->lock); |
| 481 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 482 | while ((dma = vfio_find_dma(iommu, unmap->iova, unmap->size))) { |
| 483 | size = unmap->size; |
| 484 | ret = vfio_remove_dma_overlap(iommu, unmap->iova, &size, dma); |
| 485 | if (ret) |
| 486 | break; |
| 487 | unmapped += size; |
| 488 | } |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 489 | |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 490 | mutex_unlock(&iommu->lock); |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 491 | |
| 492 | /* |
| 493 | * We may unmap more than requested, update the unmap struct so |
| 494 | * userspace can know. |
| 495 | */ |
| 496 | unmap->size = unmapped; |
| 497 | |
| 498 | return ret; |
| 499 | } |
| 500 | |
| 501 | /* |
| 502 | * Turns out AMD IOMMU has a page table bug where it won't map large pages |
| 503 | * to a region that previously mapped smaller pages. This should be fixed |
| 504 | * soon, so this is just a temporary workaround to break mappings down into |
| 505 | * PAGE_SIZE. Better to map smaller pages than nothing. |
| 506 | */ |
| 507 | static int map_try_harder(struct vfio_iommu *iommu, dma_addr_t iova, |
| 508 | unsigned long pfn, long npage, int prot) |
| 509 | { |
| 510 | long i; |
| 511 | int ret; |
| 512 | |
| 513 | for (i = 0; i < npage; i++, pfn++, iova += PAGE_SIZE) { |
| 514 | ret = iommu_map(iommu->domain, iova, |
| 515 | (phys_addr_t)pfn << PAGE_SHIFT, |
| 516 | PAGE_SIZE, prot); |
| 517 | if (ret) |
| 518 | break; |
| 519 | } |
| 520 | |
| 521 | for (; i < npage && i > 0; i--, iova -= PAGE_SIZE) |
| 522 | iommu_unmap(iommu->domain, iova, PAGE_SIZE); |
| 523 | |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 524 | return ret; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 525 | } |
| 526 | |
| 527 | static int vfio_dma_do_map(struct vfio_iommu *iommu, |
| 528 | struct vfio_iommu_type1_dma_map *map) |
| 529 | { |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 530 | dma_addr_t end, iova; |
| 531 | unsigned long vaddr = map->vaddr; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 532 | size_t size = map->size; |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 533 | long npage; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 534 | int ret = 0, prot = 0; |
| 535 | uint64_t mask; |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 536 | |
| 537 | end = map->iova + map->size; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 538 | |
| 539 | mask = ((uint64_t)1 << __ffs(iommu->domain->ops->pgsize_bitmap)) - 1; |
| 540 | |
| 541 | /* READ/WRITE from device perspective */ |
| 542 | if (map->flags & VFIO_DMA_MAP_FLAG_WRITE) |
| 543 | prot |= IOMMU_WRITE; |
| 544 | if (map->flags & VFIO_DMA_MAP_FLAG_READ) |
| 545 | prot |= IOMMU_READ; |
| 546 | |
| 547 | if (!prot) |
| 548 | return -EINVAL; /* No READ/WRITE? */ |
| 549 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 550 | if (iommu->cache) |
| 551 | prot |= IOMMU_CACHE; |
| 552 | |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 553 | if (vaddr & mask) |
| 554 | return -EINVAL; |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 555 | if (map->iova & mask) |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 556 | return -EINVAL; |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 557 | if (!map->size || map->size & mask) |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 558 | return -EINVAL; |
| 559 | |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 560 | WARN_ON(mask & PAGE_MASK); |
| 561 | |
| 562 | /* Don't allow IOVA wrap */ |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 563 | if (end && end < map->iova) |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 564 | return -EINVAL; |
| 565 | |
| 566 | /* Don't allow virtual address wrap */ |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 567 | if (vaddr + map->size && vaddr + map->size < vaddr) |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 568 | return -EINVAL; |
| 569 | |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 570 | mutex_lock(&iommu->lock); |
| 571 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 572 | if (vfio_find_dma(iommu, map->iova, map->size)) { |
| 573 | mutex_unlock(&iommu->lock); |
| 574 | return -EEXIST; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 575 | } |
| 576 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 577 | for (iova = map->iova; iova < end; iova += size, vaddr += size) { |
| 578 | struct vfio_dma *dma = NULL; |
| 579 | unsigned long pfn; |
| 580 | long i; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 581 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 582 | /* Pin a contiguous chunk of memory */ |
| 583 | npage = vfio_pin_pages(vaddr, (end - iova) >> PAGE_SHIFT, |
| 584 | prot, &pfn); |
| 585 | if (npage <= 0) { |
| 586 | WARN_ON(!npage); |
| 587 | ret = (int)npage; |
| 588 | break; |
| 589 | } |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 590 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 591 | /* Verify pages are not already mapped */ |
| 592 | for (i = 0; i < npage; i++) { |
| 593 | if (iommu_iova_to_phys(iommu->domain, |
| 594 | iova + (i << PAGE_SHIFT))) { |
| 595 | vfio_unpin_pages(pfn, npage, prot, true); |
| 596 | ret = -EBUSY; |
| 597 | break; |
| 598 | } |
| 599 | } |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 600 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 601 | ret = iommu_map(iommu->domain, iova, |
| 602 | (phys_addr_t)pfn << PAGE_SHIFT, |
| 603 | npage << PAGE_SHIFT, prot); |
| 604 | if (ret) { |
| 605 | if (ret != -EBUSY || |
| 606 | map_try_harder(iommu, iova, pfn, npage, prot)) { |
| 607 | vfio_unpin_pages(pfn, npage, prot, true); |
| 608 | break; |
| 609 | } |
| 610 | } |
| 611 | |
| 612 | size = npage << PAGE_SHIFT; |
| 613 | |
| 614 | /* |
| 615 | * Check if we abut a region below - nothing below 0. |
| 616 | * This is the most likely case when mapping chunks of |
| 617 | * physically contiguous regions within a virtual address |
| 618 | * range. Update the abutting entry in place since iova |
| 619 | * doesn't change. |
| 620 | */ |
| 621 | if (likely(iova)) { |
| 622 | struct vfio_dma *tmp; |
| 623 | tmp = vfio_find_dma(iommu, iova - 1, 1); |
| 624 | if (tmp && tmp->prot == prot && |
| 625 | tmp->vaddr + tmp->size == vaddr) { |
| 626 | tmp->size += size; |
| 627 | |
| 628 | iova = tmp->iova; |
| 629 | size = tmp->size; |
| 630 | vaddr = tmp->vaddr; |
| 631 | dma = tmp; |
| 632 | } |
| 633 | } |
| 634 | |
| 635 | /* Check if we abut a region above - nothing above ~0 + 1 */ |
| 636 | if (likely(iova + size)) { |
| 637 | struct vfio_dma *tmp; |
| 638 | |
| 639 | tmp = vfio_find_dma(iommu, iova + size, 1); |
| 640 | if (tmp && tmp->prot == prot && |
| 641 | tmp->vaddr == vaddr + size) { |
| 642 | vfio_remove_dma(iommu, tmp); |
| 643 | if (dma) |
| 644 | dma->size += tmp->size; |
| 645 | else |
| 646 | size += tmp->size; |
| 647 | kfree(tmp); |
| 648 | } |
| 649 | } |
| 650 | |
| 651 | if (!dma) { |
| 652 | dma = kzalloc(sizeof(*dma), GFP_KERNEL); |
| 653 | if (!dma) { |
| 654 | iommu_unmap(iommu->domain, iova, size); |
| 655 | vfio_unpin_pages(pfn, npage, prot, true); |
| 656 | ret = -ENOMEM; |
| 657 | break; |
| 658 | } |
| 659 | |
| 660 | dma->size = size; |
| 661 | dma->iova = iova; |
| 662 | dma->vaddr = vaddr; |
| 663 | dma->prot = prot; |
| 664 | vfio_insert_dma(iommu, dma); |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 665 | } |
| 666 | } |
| 667 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 668 | if (ret) { |
| 669 | struct vfio_dma *tmp; |
| 670 | iova = map->iova; |
| 671 | size = map->size; |
| 672 | while ((tmp = vfio_find_dma(iommu, iova, size))) { |
| 673 | if (vfio_remove_dma_overlap(iommu, iova, &size, tmp)) { |
| 674 | pr_warn("%s: Error rolling back failed map\n", |
| 675 | __func__); |
| 676 | break; |
| 677 | } |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 678 | } |
| 679 | } |
| 680 | |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 681 | mutex_unlock(&iommu->lock); |
| 682 | return ret; |
| 683 | } |
| 684 | |
| 685 | static int vfio_iommu_type1_attach_group(void *iommu_data, |
| 686 | struct iommu_group *iommu_group) |
| 687 | { |
| 688 | struct vfio_iommu *iommu = iommu_data; |
| 689 | struct vfio_group *group, *tmp; |
| 690 | int ret; |
| 691 | |
| 692 | group = kzalloc(sizeof(*group), GFP_KERNEL); |
| 693 | if (!group) |
| 694 | return -ENOMEM; |
| 695 | |
| 696 | mutex_lock(&iommu->lock); |
| 697 | |
| 698 | list_for_each_entry(tmp, &iommu->group_list, next) { |
| 699 | if (tmp->iommu_group == iommu_group) { |
| 700 | mutex_unlock(&iommu->lock); |
| 701 | kfree(group); |
| 702 | return -EINVAL; |
| 703 | } |
| 704 | } |
| 705 | |
| 706 | /* |
| 707 | * TODO: Domain have capabilities that might change as we add |
| 708 | * groups (see iommu->cache, currently never set). Check for |
| 709 | * them and potentially disallow groups to be attached when it |
| 710 | * would change capabilities (ugh). |
| 711 | */ |
| 712 | ret = iommu_attach_group(iommu->domain, iommu_group); |
| 713 | if (ret) { |
| 714 | mutex_unlock(&iommu->lock); |
| 715 | kfree(group); |
| 716 | return ret; |
| 717 | } |
| 718 | |
| 719 | group->iommu_group = iommu_group; |
| 720 | list_add(&group->next, &iommu->group_list); |
| 721 | |
| 722 | mutex_unlock(&iommu->lock); |
| 723 | |
| 724 | return 0; |
| 725 | } |
| 726 | |
| 727 | static void vfio_iommu_type1_detach_group(void *iommu_data, |
| 728 | struct iommu_group *iommu_group) |
| 729 | { |
| 730 | struct vfio_iommu *iommu = iommu_data; |
| 731 | struct vfio_group *group; |
| 732 | |
| 733 | mutex_lock(&iommu->lock); |
| 734 | |
| 735 | list_for_each_entry(group, &iommu->group_list, next) { |
| 736 | if (group->iommu_group == iommu_group) { |
| 737 | iommu_detach_group(iommu->domain, iommu_group); |
| 738 | list_del(&group->next); |
| 739 | kfree(group); |
| 740 | break; |
| 741 | } |
| 742 | } |
| 743 | |
| 744 | mutex_unlock(&iommu->lock); |
| 745 | } |
| 746 | |
| 747 | static void *vfio_iommu_type1_open(unsigned long arg) |
| 748 | { |
| 749 | struct vfio_iommu *iommu; |
| 750 | |
| 751 | if (arg != VFIO_TYPE1_IOMMU) |
| 752 | return ERR_PTR(-EINVAL); |
| 753 | |
| 754 | iommu = kzalloc(sizeof(*iommu), GFP_KERNEL); |
| 755 | if (!iommu) |
| 756 | return ERR_PTR(-ENOMEM); |
| 757 | |
| 758 | INIT_LIST_HEAD(&iommu->group_list); |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 759 | iommu->dma_list = RB_ROOT; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 760 | mutex_init(&iommu->lock); |
| 761 | |
| 762 | /* |
| 763 | * Wish we didn't have to know about bus_type here. |
| 764 | */ |
| 765 | iommu->domain = iommu_domain_alloc(&pci_bus_type); |
| 766 | if (!iommu->domain) { |
| 767 | kfree(iommu); |
| 768 | return ERR_PTR(-EIO); |
| 769 | } |
| 770 | |
| 771 | /* |
| 772 | * Wish we could specify required capabilities rather than create |
| 773 | * a domain, see what comes out and hope it doesn't change along |
| 774 | * the way. Fortunately we know interrupt remapping is global for |
| 775 | * our iommus. |
| 776 | */ |
| 777 | if (!allow_unsafe_interrupts && |
| 778 | !iommu_domain_has_cap(iommu->domain, IOMMU_CAP_INTR_REMAP)) { |
| 779 | pr_warn("%s: No interrupt remapping support. Use the module param \"allow_unsafe_interrupts\" to enable VFIO IOMMU support on this platform\n", |
| 780 | __func__); |
| 781 | iommu_domain_free(iommu->domain); |
| 782 | kfree(iommu); |
| 783 | return ERR_PTR(-EPERM); |
| 784 | } |
| 785 | |
| 786 | return iommu; |
| 787 | } |
| 788 | |
| 789 | static void vfio_iommu_type1_release(void *iommu_data) |
| 790 | { |
| 791 | struct vfio_iommu *iommu = iommu_data; |
| 792 | struct vfio_group *group, *group_tmp; |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 793 | struct rb_node *node; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 794 | |
| 795 | list_for_each_entry_safe(group, group_tmp, &iommu->group_list, next) { |
| 796 | iommu_detach_group(iommu->domain, group->iommu_group); |
| 797 | list_del(&group->next); |
| 798 | kfree(group); |
| 799 | } |
| 800 | |
Alex Williamson | cd9b226 | 2013-06-21 09:37:50 -0600 | [diff] [blame] | 801 | while ((node = rb_first(&iommu->dma_list))) { |
| 802 | struct vfio_dma *dma = rb_entry(node, struct vfio_dma, node); |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 803 | size_t size = dma->size; |
| 804 | vfio_remove_dma_overlap(iommu, dma->iova, &size, dma); |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 805 | } |
| 806 | |
| 807 | iommu_domain_free(iommu->domain); |
| 808 | iommu->domain = NULL; |
| 809 | kfree(iommu); |
| 810 | } |
| 811 | |
| 812 | static long vfio_iommu_type1_ioctl(void *iommu_data, |
| 813 | unsigned int cmd, unsigned long arg) |
| 814 | { |
| 815 | struct vfio_iommu *iommu = iommu_data; |
| 816 | unsigned long minsz; |
| 817 | |
| 818 | if (cmd == VFIO_CHECK_EXTENSION) { |
| 819 | switch (arg) { |
| 820 | case VFIO_TYPE1_IOMMU: |
| 821 | return 1; |
| 822 | default: |
| 823 | return 0; |
| 824 | } |
| 825 | } else if (cmd == VFIO_IOMMU_GET_INFO) { |
| 826 | struct vfio_iommu_type1_info info; |
| 827 | |
| 828 | minsz = offsetofend(struct vfio_iommu_type1_info, iova_pgsizes); |
| 829 | |
| 830 | if (copy_from_user(&info, (void __user *)arg, minsz)) |
| 831 | return -EFAULT; |
| 832 | |
| 833 | if (info.argsz < minsz) |
| 834 | return -EINVAL; |
| 835 | |
| 836 | info.flags = 0; |
| 837 | |
| 838 | info.iova_pgsizes = iommu->domain->ops->pgsize_bitmap; |
| 839 | |
| 840 | return copy_to_user((void __user *)arg, &info, minsz); |
| 841 | |
| 842 | } else if (cmd == VFIO_IOMMU_MAP_DMA) { |
| 843 | struct vfio_iommu_type1_dma_map map; |
| 844 | uint32_t mask = VFIO_DMA_MAP_FLAG_READ | |
| 845 | VFIO_DMA_MAP_FLAG_WRITE; |
| 846 | |
| 847 | minsz = offsetofend(struct vfio_iommu_type1_dma_map, size); |
| 848 | |
| 849 | if (copy_from_user(&map, (void __user *)arg, minsz)) |
| 850 | return -EFAULT; |
| 851 | |
| 852 | if (map.argsz < minsz || map.flags & ~mask) |
| 853 | return -EINVAL; |
| 854 | |
| 855 | return vfio_dma_do_map(iommu, &map); |
| 856 | |
| 857 | } else if (cmd == VFIO_IOMMU_UNMAP_DMA) { |
| 858 | struct vfio_iommu_type1_dma_unmap unmap; |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 859 | long ret; |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 860 | |
| 861 | minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, size); |
| 862 | |
| 863 | if (copy_from_user(&unmap, (void __user *)arg, minsz)) |
| 864 | return -EFAULT; |
| 865 | |
| 866 | if (unmap.argsz < minsz || unmap.flags) |
| 867 | return -EINVAL; |
| 868 | |
Alex Williamson | 166fd7d | 2013-06-21 09:38:02 -0600 | [diff] [blame^] | 869 | ret = vfio_dma_do_unmap(iommu, &unmap); |
| 870 | if (ret) |
| 871 | return ret; |
| 872 | |
| 873 | return copy_to_user((void __user *)arg, &unmap, minsz); |
Alex Williamson | 73fa0d1 | 2012-07-31 08:16:23 -0600 | [diff] [blame] | 874 | } |
| 875 | |
| 876 | return -ENOTTY; |
| 877 | } |
| 878 | |
| 879 | static const struct vfio_iommu_driver_ops vfio_iommu_driver_ops_type1 = { |
| 880 | .name = "vfio-iommu-type1", |
| 881 | .owner = THIS_MODULE, |
| 882 | .open = vfio_iommu_type1_open, |
| 883 | .release = vfio_iommu_type1_release, |
| 884 | .ioctl = vfio_iommu_type1_ioctl, |
| 885 | .attach_group = vfio_iommu_type1_attach_group, |
| 886 | .detach_group = vfio_iommu_type1_detach_group, |
| 887 | }; |
| 888 | |
| 889 | static int __init vfio_iommu_type1_init(void) |
| 890 | { |
| 891 | if (!iommu_present(&pci_bus_type)) |
| 892 | return -ENODEV; |
| 893 | |
| 894 | return vfio_register_iommu_driver(&vfio_iommu_driver_ops_type1); |
| 895 | } |
| 896 | |
| 897 | static void __exit vfio_iommu_type1_cleanup(void) |
| 898 | { |
| 899 | vfio_unregister_iommu_driver(&vfio_iommu_driver_ops_type1); |
| 900 | } |
| 901 | |
| 902 | module_init(vfio_iommu_type1_init); |
| 903 | module_exit(vfio_iommu_type1_cleanup); |
| 904 | |
| 905 | MODULE_VERSION(DRIVER_VERSION); |
| 906 | MODULE_LICENSE("GPL v2"); |
| 907 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 908 | MODULE_DESCRIPTION(DRIVER_DESC); |