Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 1 | /* |
| 2 | * VFIO: IOMMU DMA mapping support for TCE on POWER |
| 3 | * |
| 4 | * Copyright (C) 2013 IBM Corp. All rights reserved. |
| 5 | * Author: Alexey Kardashevskiy <aik@ozlabs.ru> |
| 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_iommu_type1.c: |
| 12 | * Copyright (C) 2012 Red Hat, Inc. All rights reserved. |
| 13 | * Author: Alex Williamson <alex.williamson@redhat.com> |
| 14 | */ |
| 15 | |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/pci.h> |
| 18 | #include <linux/slab.h> |
| 19 | #include <linux/uaccess.h> |
| 20 | #include <linux/err.h> |
| 21 | #include <linux/vfio.h> |
| 22 | #include <asm/iommu.h> |
| 23 | #include <asm/tce.h> |
| 24 | |
| 25 | #define DRIVER_VERSION "0.1" |
| 26 | #define DRIVER_AUTHOR "aik@ozlabs.ru" |
| 27 | #define DRIVER_DESC "VFIO IOMMU SPAPR TCE" |
| 28 | |
| 29 | static void tce_iommu_detach_group(void *iommu_data, |
| 30 | struct iommu_group *iommu_group); |
| 31 | |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 32 | static long try_increment_locked_vm(long npages) |
| 33 | { |
| 34 | long ret = 0, locked, lock_limit; |
| 35 | |
| 36 | if (!current || !current->mm) |
| 37 | return -ESRCH; /* process exited */ |
| 38 | |
| 39 | if (!npages) |
| 40 | return 0; |
| 41 | |
| 42 | down_write(¤t->mm->mmap_sem); |
| 43 | locked = current->mm->locked_vm + npages; |
| 44 | lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; |
| 45 | if (locked > lock_limit && !capable(CAP_IPC_LOCK)) |
| 46 | ret = -ENOMEM; |
| 47 | else |
| 48 | current->mm->locked_vm += npages; |
| 49 | |
| 50 | pr_debug("[%d] RLIMIT_MEMLOCK +%ld %ld/%ld%s\n", current->pid, |
| 51 | npages << PAGE_SHIFT, |
| 52 | current->mm->locked_vm << PAGE_SHIFT, |
| 53 | rlimit(RLIMIT_MEMLOCK), |
| 54 | ret ? " - exceeded" : ""); |
| 55 | |
| 56 | up_write(¤t->mm->mmap_sem); |
| 57 | |
| 58 | return ret; |
| 59 | } |
| 60 | |
| 61 | static void decrement_locked_vm(long npages) |
| 62 | { |
| 63 | if (!current || !current->mm || !npages) |
| 64 | return; /* process exited */ |
| 65 | |
| 66 | down_write(¤t->mm->mmap_sem); |
| 67 | if (WARN_ON_ONCE(npages > current->mm->locked_vm)) |
| 68 | npages = current->mm->locked_vm; |
| 69 | current->mm->locked_vm -= npages; |
| 70 | pr_debug("[%d] RLIMIT_MEMLOCK -%ld %ld/%ld\n", current->pid, |
| 71 | npages << PAGE_SHIFT, |
| 72 | current->mm->locked_vm << PAGE_SHIFT, |
| 73 | rlimit(RLIMIT_MEMLOCK)); |
| 74 | up_write(¤t->mm->mmap_sem); |
| 75 | } |
| 76 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 77 | /* |
| 78 | * VFIO IOMMU fd for SPAPR_TCE IOMMU implementation |
| 79 | * |
| 80 | * This code handles mapping and unmapping of user data buffers |
| 81 | * into DMA'ble space using the IOMMU |
| 82 | */ |
| 83 | |
| 84 | /* |
| 85 | * The container descriptor supports only a single group per container. |
| 86 | * Required by the API as the container is not supplied with the IOMMU group |
| 87 | * at the moment of initialization. |
| 88 | */ |
| 89 | struct tce_container { |
| 90 | struct mutex lock; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 91 | struct iommu_group *grp; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 92 | bool enabled; |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 93 | unsigned long locked_pages; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 94 | }; |
| 95 | |
Alexey Kardashevskiy | e432bc7 | 2015-06-05 16:34:59 +1000 | [diff] [blame] | 96 | static bool tce_page_is_contained(struct page *page, unsigned page_shift) |
| 97 | { |
| 98 | /* |
| 99 | * Check that the TCE table granularity is not bigger than the size of |
| 100 | * a page we just found. Otherwise the hardware can get access to |
| 101 | * a bigger memory chunk that it should. |
| 102 | */ |
| 103 | return (PAGE_SHIFT + compound_order(compound_head(page))) >= page_shift; |
| 104 | } |
| 105 | |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 106 | static long tce_iommu_find_table(struct tce_container *container, |
| 107 | phys_addr_t ioba, struct iommu_table **ptbl) |
| 108 | { |
| 109 | long i; |
| 110 | struct iommu_table_group *table_group; |
| 111 | |
| 112 | table_group = iommu_group_get_iommudata(container->grp); |
| 113 | if (!table_group) |
| 114 | return -1; |
| 115 | |
| 116 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { |
| 117 | struct iommu_table *tbl = table_group->tables[i]; |
| 118 | |
| 119 | if (tbl) { |
| 120 | unsigned long entry = ioba >> tbl->it_page_shift; |
| 121 | unsigned long start = tbl->it_offset; |
| 122 | unsigned long end = start + tbl->it_size; |
| 123 | |
| 124 | if ((start <= entry) && (entry < end)) { |
| 125 | *ptbl = tbl; |
| 126 | return i; |
| 127 | } |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | return -1; |
| 132 | } |
| 133 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 134 | static int tce_iommu_enable(struct tce_container *container) |
| 135 | { |
| 136 | int ret = 0; |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 137 | unsigned long locked; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 138 | struct iommu_table_group *table_group; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 139 | |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 140 | if (!container->grp) |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 141 | return -ENXIO; |
| 142 | |
| 143 | if (!current->mm) |
| 144 | return -ESRCH; /* process exited */ |
| 145 | |
| 146 | if (container->enabled) |
| 147 | return -EBUSY; |
| 148 | |
| 149 | /* |
| 150 | * When userspace pages are mapped into the IOMMU, they are effectively |
| 151 | * locked memory, so, theoretically, we need to update the accounting |
| 152 | * of locked pages on each map and unmap. For powerpc, the map unmap |
| 153 | * paths can be very hot, though, and the accounting would kill |
| 154 | * performance, especially since it would be difficult to impossible |
| 155 | * to handle the accounting in real mode only. |
| 156 | * |
| 157 | * To address that, rather than precisely accounting every page, we |
| 158 | * instead account for a worst case on locked memory when the iommu is |
| 159 | * enabled and disabled. The worst case upper bound on locked memory |
| 160 | * is the size of the whole iommu window, which is usually relatively |
| 161 | * small (compared to total memory sizes) on POWER hardware. |
| 162 | * |
| 163 | * Also we don't have a nice way to fail on H_PUT_TCE due to ulimits, |
| 164 | * that would effectively kill the guest at random points, much better |
| 165 | * enforcing the limit based on the max that the guest can map. |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 166 | * |
| 167 | * Unfortunately at the moment it counts whole tables, no matter how |
| 168 | * much memory the guest has. I.e. for 4GB guest and 4 IOMMU groups |
| 169 | * each with 2GB DMA window, 8GB will be counted here. The reason for |
| 170 | * this is that we cannot tell here the amount of RAM used by the guest |
| 171 | * as this information is only available from KVM and VFIO is |
| 172 | * KVM agnostic. |
Alexey Kardashevskiy | 4793d65 | 2015-06-05 16:35:20 +1000 | [diff] [blame] | 173 | * |
| 174 | * So we do not allow enabling a container without a group attached |
| 175 | * as there is no way to know how much we should increment |
| 176 | * the locked_vm counter. |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 177 | */ |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 178 | table_group = iommu_group_get_iommudata(container->grp); |
| 179 | if (!table_group) |
| 180 | return -ENODEV; |
| 181 | |
Alexey Kardashevskiy | 4793d65 | 2015-06-05 16:35:20 +1000 | [diff] [blame] | 182 | if (!table_group->tce32_size) |
| 183 | return -EPERM; |
| 184 | |
| 185 | locked = table_group->tce32_size >> PAGE_SHIFT; |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 186 | ret = try_increment_locked_vm(locked); |
| 187 | if (ret) |
| 188 | return ret; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 189 | |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 190 | container->locked_pages = locked; |
| 191 | |
| 192 | container->enabled = true; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 193 | |
| 194 | return ret; |
| 195 | } |
| 196 | |
| 197 | static void tce_iommu_disable(struct tce_container *container) |
| 198 | { |
| 199 | if (!container->enabled) |
| 200 | return; |
| 201 | |
| 202 | container->enabled = false; |
| 203 | |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 204 | if (!current->mm) |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 205 | return; |
| 206 | |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 207 | decrement_locked_vm(container->locked_pages); |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 208 | } |
| 209 | |
| 210 | static void *tce_iommu_open(unsigned long arg) |
| 211 | { |
| 212 | struct tce_container *container; |
| 213 | |
| 214 | if (arg != VFIO_SPAPR_TCE_IOMMU) { |
| 215 | pr_err("tce_vfio: Wrong IOMMU type\n"); |
| 216 | return ERR_PTR(-EINVAL); |
| 217 | } |
| 218 | |
| 219 | container = kzalloc(sizeof(*container), GFP_KERNEL); |
| 220 | if (!container) |
| 221 | return ERR_PTR(-ENOMEM); |
| 222 | |
| 223 | mutex_init(&container->lock); |
| 224 | |
| 225 | return container; |
| 226 | } |
| 227 | |
| 228 | static void tce_iommu_release(void *iommu_data) |
| 229 | { |
| 230 | struct tce_container *container = iommu_data; |
| 231 | |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 232 | WARN_ON(container->grp); |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 233 | |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 234 | if (container->grp) |
| 235 | tce_iommu_detach_group(iommu_data, container->grp); |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 236 | |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 237 | tce_iommu_disable(container); |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 238 | mutex_destroy(&container->lock); |
| 239 | |
| 240 | kfree(container); |
| 241 | } |
| 242 | |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 243 | static void tce_iommu_unuse_page(struct tce_container *container, |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 244 | unsigned long hpa) |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 245 | { |
| 246 | struct page *page; |
| 247 | |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 248 | page = pfn_to_page(hpa >> PAGE_SHIFT); |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 249 | put_page(page); |
| 250 | } |
| 251 | |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 252 | static int tce_iommu_clear(struct tce_container *container, |
| 253 | struct iommu_table *tbl, |
| 254 | unsigned long entry, unsigned long pages) |
| 255 | { |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 256 | unsigned long oldhpa; |
| 257 | long ret; |
| 258 | enum dma_data_direction direction; |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 259 | |
| 260 | for ( ; pages; --pages, ++entry) { |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 261 | direction = DMA_NONE; |
| 262 | oldhpa = 0; |
| 263 | ret = iommu_tce_xchg(tbl, entry, &oldhpa, &direction); |
| 264 | if (ret) |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 265 | continue; |
| 266 | |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 267 | if (direction == DMA_NONE) |
| 268 | continue; |
| 269 | |
| 270 | tce_iommu_unuse_page(container, oldhpa); |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 271 | } |
| 272 | |
| 273 | return 0; |
| 274 | } |
| 275 | |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 276 | static int tce_iommu_use_page(unsigned long tce, unsigned long *hpa) |
| 277 | { |
| 278 | struct page *page = NULL; |
| 279 | enum dma_data_direction direction = iommu_tce_direction(tce); |
| 280 | |
| 281 | if (get_user_pages_fast(tce & PAGE_MASK, 1, |
| 282 | direction != DMA_TO_DEVICE, &page) != 1) |
| 283 | return -EFAULT; |
| 284 | |
| 285 | *hpa = __pa((unsigned long) page_address(page)); |
| 286 | |
| 287 | return 0; |
| 288 | } |
| 289 | |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 290 | static long tce_iommu_build(struct tce_container *container, |
| 291 | struct iommu_table *tbl, |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 292 | unsigned long entry, unsigned long tce, unsigned long pages, |
| 293 | enum dma_data_direction direction) |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 294 | { |
| 295 | long i, ret = 0; |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 296 | struct page *page; |
| 297 | unsigned long hpa; |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 298 | enum dma_data_direction dirtmp; |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 299 | |
| 300 | for (i = 0; i < pages; ++i) { |
| 301 | unsigned long offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK; |
| 302 | |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 303 | ret = tce_iommu_use_page(tce, &hpa); |
| 304 | if (ret) |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 305 | break; |
Alexey Kardashevskiy | e432bc7 | 2015-06-05 16:34:59 +1000 | [diff] [blame] | 306 | |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 307 | page = pfn_to_page(hpa >> PAGE_SHIFT); |
Alexey Kardashevskiy | e432bc7 | 2015-06-05 16:34:59 +1000 | [diff] [blame] | 308 | if (!tce_page_is_contained(page, tbl->it_page_shift)) { |
| 309 | ret = -EPERM; |
| 310 | break; |
| 311 | } |
| 312 | |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 313 | hpa |= offset; |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 314 | dirtmp = direction; |
| 315 | ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp); |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 316 | if (ret) { |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 317 | tce_iommu_unuse_page(container, hpa); |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 318 | pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n", |
| 319 | __func__, entry << tbl->it_page_shift, |
| 320 | tce, ret); |
| 321 | break; |
| 322 | } |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 323 | |
| 324 | if (dirtmp != DMA_NONE) |
| 325 | tce_iommu_unuse_page(container, hpa); |
| 326 | |
Alexey Kardashevskiy | 00663d4 | 2015-06-05 16:35:00 +1000 | [diff] [blame] | 327 | tce += IOMMU_PAGE_SIZE(tbl); |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 328 | } |
| 329 | |
| 330 | if (ret) |
| 331 | tce_iommu_clear(container, tbl, entry, i); |
| 332 | |
| 333 | return ret; |
| 334 | } |
| 335 | |
Alexey Kardashevskiy | 46d3e1e | 2015-06-05 16:35:23 +1000 | [diff] [blame^] | 336 | static long tce_iommu_create_table(struct tce_container *container, |
| 337 | struct iommu_table_group *table_group, |
| 338 | int num, |
| 339 | __u32 page_shift, |
| 340 | __u64 window_size, |
| 341 | __u32 levels, |
| 342 | struct iommu_table **ptbl) |
| 343 | { |
| 344 | long ret, table_size; |
| 345 | |
| 346 | table_size = table_group->ops->get_table_size(page_shift, window_size, |
| 347 | levels); |
| 348 | if (!table_size) |
| 349 | return -EINVAL; |
| 350 | |
| 351 | ret = try_increment_locked_vm(table_size >> PAGE_SHIFT); |
| 352 | if (ret) |
| 353 | return ret; |
| 354 | |
| 355 | ret = table_group->ops->create_table(table_group, num, |
| 356 | page_shift, window_size, levels, ptbl); |
| 357 | |
| 358 | WARN_ON(!ret && !(*ptbl)->it_ops->free); |
| 359 | WARN_ON(!ret && ((*ptbl)->it_allocated_size != table_size)); |
| 360 | |
| 361 | if (ret) |
| 362 | decrement_locked_vm(table_size >> PAGE_SHIFT); |
| 363 | |
| 364 | return ret; |
| 365 | } |
| 366 | |
| 367 | static void tce_iommu_free_table(struct iommu_table *tbl) |
| 368 | { |
| 369 | unsigned long pages = tbl->it_allocated_size >> PAGE_SHIFT; |
| 370 | |
| 371 | tbl->it_ops->free(tbl); |
| 372 | decrement_locked_vm(pages); |
| 373 | } |
| 374 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 375 | static long tce_iommu_ioctl(void *iommu_data, |
| 376 | unsigned int cmd, unsigned long arg) |
| 377 | { |
| 378 | struct tce_container *container = iommu_data; |
| 379 | unsigned long minsz; |
| 380 | long ret; |
| 381 | |
| 382 | switch (cmd) { |
| 383 | case VFIO_CHECK_EXTENSION: |
Gavin Shan | 1b69be5 | 2014-06-10 11:41:57 +1000 | [diff] [blame] | 384 | switch (arg) { |
| 385 | case VFIO_SPAPR_TCE_IOMMU: |
| 386 | ret = 1; |
| 387 | break; |
| 388 | default: |
| 389 | ret = vfio_spapr_iommu_eeh_ioctl(NULL, cmd, arg); |
| 390 | break; |
| 391 | } |
| 392 | |
| 393 | return (ret < 0) ? 0 : ret; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 394 | |
| 395 | case VFIO_IOMMU_SPAPR_TCE_GET_INFO: { |
| 396 | struct vfio_iommu_spapr_tce_info info; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 397 | struct iommu_table_group *table_group; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 398 | |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 399 | if (WARN_ON(!container->grp)) |
| 400 | return -ENXIO; |
| 401 | |
| 402 | table_group = iommu_group_get_iommudata(container->grp); |
| 403 | |
Alexey Kardashevskiy | 4793d65 | 2015-06-05 16:35:20 +1000 | [diff] [blame] | 404 | if (!table_group) |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 405 | return -ENXIO; |
| 406 | |
| 407 | minsz = offsetofend(struct vfio_iommu_spapr_tce_info, |
| 408 | dma32_window_size); |
| 409 | |
| 410 | if (copy_from_user(&info, (void __user *)arg, minsz)) |
| 411 | return -EFAULT; |
| 412 | |
| 413 | if (info.argsz < minsz) |
| 414 | return -EINVAL; |
| 415 | |
Alexey Kardashevskiy | 4793d65 | 2015-06-05 16:35:20 +1000 | [diff] [blame] | 416 | info.dma32_window_start = table_group->tce32_start; |
| 417 | info.dma32_window_size = table_group->tce32_size; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 418 | info.flags = 0; |
| 419 | |
| 420 | if (copy_to_user((void __user *)arg, &info, minsz)) |
| 421 | return -EFAULT; |
| 422 | |
| 423 | return 0; |
| 424 | } |
| 425 | case VFIO_IOMMU_MAP_DMA: { |
| 426 | struct vfio_iommu_type1_dma_map param; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 427 | struct iommu_table *tbl = NULL; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 428 | long num; |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 429 | enum dma_data_direction direction; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 430 | |
Alexey Kardashevskiy | 3c56e82 | 2015-06-05 16:35:02 +1000 | [diff] [blame] | 431 | if (!container->enabled) |
| 432 | return -EPERM; |
| 433 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 434 | minsz = offsetofend(struct vfio_iommu_type1_dma_map, size); |
| 435 | |
| 436 | if (copy_from_user(¶m, (void __user *)arg, minsz)) |
| 437 | return -EFAULT; |
| 438 | |
| 439 | if (param.argsz < minsz) |
| 440 | return -EINVAL; |
| 441 | |
| 442 | if (param.flags & ~(VFIO_DMA_MAP_FLAG_READ | |
| 443 | VFIO_DMA_MAP_FLAG_WRITE)) |
| 444 | return -EINVAL; |
| 445 | |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 446 | num = tce_iommu_find_table(container, param.iova, &tbl); |
| 447 | if (num < 0) |
| 448 | return -ENXIO; |
| 449 | |
Alexey Kardashevskiy | 00663d4 | 2015-06-05 16:35:00 +1000 | [diff] [blame] | 450 | if ((param.size & ~IOMMU_PAGE_MASK(tbl)) || |
| 451 | (param.vaddr & ~IOMMU_PAGE_MASK(tbl))) |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 452 | return -EINVAL; |
| 453 | |
| 454 | /* iova is checked by the IOMMU API */ |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 455 | if (param.flags & VFIO_DMA_MAP_FLAG_READ) { |
| 456 | if (param.flags & VFIO_DMA_MAP_FLAG_WRITE) |
| 457 | direction = DMA_BIDIRECTIONAL; |
| 458 | else |
| 459 | direction = DMA_TO_DEVICE; |
| 460 | } else { |
| 461 | if (param.flags & VFIO_DMA_MAP_FLAG_WRITE) |
| 462 | direction = DMA_FROM_DEVICE; |
| 463 | else |
| 464 | return -EINVAL; |
| 465 | } |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 466 | |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 467 | ret = iommu_tce_put_param_check(tbl, param.iova, param.vaddr); |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 468 | if (ret) |
| 469 | return ret; |
| 470 | |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 471 | ret = tce_iommu_build(container, tbl, |
Alexey Kardashevskiy | 00663d4 | 2015-06-05 16:35:00 +1000 | [diff] [blame] | 472 | param.iova >> tbl->it_page_shift, |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 473 | param.vaddr, |
| 474 | param.size >> tbl->it_page_shift, |
| 475 | direction); |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 476 | |
| 477 | iommu_flush_tce(tbl); |
| 478 | |
| 479 | return ret; |
| 480 | } |
| 481 | case VFIO_IOMMU_UNMAP_DMA: { |
| 482 | struct vfio_iommu_type1_dma_unmap param; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 483 | struct iommu_table *tbl = NULL; |
| 484 | long num; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 485 | |
Alexey Kardashevskiy | 3c56e82 | 2015-06-05 16:35:02 +1000 | [diff] [blame] | 486 | if (!container->enabled) |
| 487 | return -EPERM; |
| 488 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 489 | minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, |
| 490 | size); |
| 491 | |
| 492 | if (copy_from_user(¶m, (void __user *)arg, minsz)) |
| 493 | return -EFAULT; |
| 494 | |
| 495 | if (param.argsz < minsz) |
| 496 | return -EINVAL; |
| 497 | |
| 498 | /* No flag is supported now */ |
| 499 | if (param.flags) |
| 500 | return -EINVAL; |
| 501 | |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 502 | num = tce_iommu_find_table(container, param.iova, &tbl); |
| 503 | if (num < 0) |
| 504 | return -ENXIO; |
| 505 | |
Alexey Kardashevskiy | 00663d4 | 2015-06-05 16:35:00 +1000 | [diff] [blame] | 506 | if (param.size & ~IOMMU_PAGE_MASK(tbl)) |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 507 | return -EINVAL; |
| 508 | |
| 509 | ret = iommu_tce_clear_param_check(tbl, param.iova, 0, |
Alexey Kardashevskiy | 00663d4 | 2015-06-05 16:35:00 +1000 | [diff] [blame] | 510 | param.size >> tbl->it_page_shift); |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 511 | if (ret) |
| 512 | return ret; |
| 513 | |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 514 | ret = tce_iommu_clear(container, tbl, |
Alexey Kardashevskiy | 00663d4 | 2015-06-05 16:35:00 +1000 | [diff] [blame] | 515 | param.iova >> tbl->it_page_shift, |
| 516 | param.size >> tbl->it_page_shift); |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 517 | iommu_flush_tce(tbl); |
| 518 | |
| 519 | return ret; |
| 520 | } |
| 521 | case VFIO_IOMMU_ENABLE: |
| 522 | mutex_lock(&container->lock); |
| 523 | ret = tce_iommu_enable(container); |
| 524 | mutex_unlock(&container->lock); |
| 525 | return ret; |
| 526 | |
| 527 | |
| 528 | case VFIO_IOMMU_DISABLE: |
| 529 | mutex_lock(&container->lock); |
| 530 | tce_iommu_disable(container); |
| 531 | mutex_unlock(&container->lock); |
| 532 | return 0; |
Gavin Shan | 1b69be5 | 2014-06-10 11:41:57 +1000 | [diff] [blame] | 533 | case VFIO_EEH_PE_OP: |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 534 | if (!container->grp) |
Gavin Shan | 1b69be5 | 2014-06-10 11:41:57 +1000 | [diff] [blame] | 535 | return -ENODEV; |
| 536 | |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 537 | return vfio_spapr_iommu_eeh_ioctl(container->grp, |
| 538 | cmd, arg); |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 539 | } |
| 540 | |
| 541 | return -ENOTTY; |
| 542 | } |
| 543 | |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 544 | static void tce_iommu_release_ownership(struct tce_container *container, |
| 545 | struct iommu_table_group *table_group) |
| 546 | { |
| 547 | int i; |
| 548 | |
| 549 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { |
| 550 | struct iommu_table *tbl = table_group->tables[i]; |
| 551 | |
| 552 | if (!tbl) |
| 553 | continue; |
| 554 | |
| 555 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); |
| 556 | if (tbl->it_map) |
| 557 | iommu_release_ownership(tbl); |
| 558 | } |
| 559 | } |
| 560 | |
| 561 | static int tce_iommu_take_ownership(struct tce_container *container, |
| 562 | struct iommu_table_group *table_group) |
| 563 | { |
| 564 | int i, j, rc = 0; |
| 565 | |
| 566 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { |
| 567 | struct iommu_table *tbl = table_group->tables[i]; |
| 568 | |
| 569 | if (!tbl || !tbl->it_map) |
| 570 | continue; |
| 571 | |
| 572 | rc = iommu_take_ownership(tbl); |
| 573 | if (rc) { |
| 574 | for (j = 0; j < i; ++j) |
| 575 | iommu_release_ownership( |
| 576 | table_group->tables[j]); |
| 577 | |
| 578 | return rc; |
| 579 | } |
| 580 | } |
| 581 | |
| 582 | return 0; |
| 583 | } |
| 584 | |
| 585 | static void tce_iommu_release_ownership_ddw(struct tce_container *container, |
| 586 | struct iommu_table_group *table_group) |
| 587 | { |
Alexey Kardashevskiy | 46d3e1e | 2015-06-05 16:35:23 +1000 | [diff] [blame^] | 588 | long i; |
| 589 | |
| 590 | if (!table_group->ops->unset_window) { |
| 591 | WARN_ON_ONCE(1); |
| 592 | return; |
| 593 | } |
| 594 | |
| 595 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { |
| 596 | /* Store table pointer as unset_window resets it */ |
| 597 | struct iommu_table *tbl = table_group->tables[i]; |
| 598 | |
| 599 | if (!tbl) |
| 600 | continue; |
| 601 | |
| 602 | table_group->ops->unset_window(table_group, i); |
| 603 | tce_iommu_clear(container, tbl, |
| 604 | tbl->it_offset, tbl->it_size); |
| 605 | tce_iommu_free_table(tbl); |
| 606 | } |
| 607 | |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 608 | table_group->ops->release_ownership(table_group); |
| 609 | } |
| 610 | |
| 611 | static long tce_iommu_take_ownership_ddw(struct tce_container *container, |
| 612 | struct iommu_table_group *table_group) |
| 613 | { |
Alexey Kardashevskiy | 46d3e1e | 2015-06-05 16:35:23 +1000 | [diff] [blame^] | 614 | long ret; |
| 615 | struct iommu_table *tbl = NULL; |
| 616 | |
| 617 | if (!table_group->ops->create_table || !table_group->ops->set_window || |
| 618 | !table_group->ops->release_ownership) { |
| 619 | WARN_ON_ONCE(1); |
| 620 | return -EFAULT; |
| 621 | } |
| 622 | |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 623 | table_group->ops->take_ownership(table_group); |
| 624 | |
Alexey Kardashevskiy | 46d3e1e | 2015-06-05 16:35:23 +1000 | [diff] [blame^] | 625 | ret = tce_iommu_create_table(container, |
| 626 | table_group, |
| 627 | 0, /* window number */ |
| 628 | IOMMU_PAGE_SHIFT_4K, |
| 629 | table_group->tce32_size, |
| 630 | 1, /* default levels */ |
| 631 | &tbl); |
| 632 | if (!ret) { |
| 633 | ret = table_group->ops->set_window(table_group, 0, tbl); |
| 634 | if (ret) |
| 635 | tce_iommu_free_table(tbl); |
| 636 | else |
| 637 | table_group->tables[0] = tbl; |
| 638 | } |
| 639 | |
| 640 | if (ret) |
| 641 | table_group->ops->release_ownership(table_group); |
| 642 | |
| 643 | return ret; |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 644 | } |
| 645 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 646 | static int tce_iommu_attach_group(void *iommu_data, |
| 647 | struct iommu_group *iommu_group) |
| 648 | { |
| 649 | int ret; |
| 650 | struct tce_container *container = iommu_data; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 651 | struct iommu_table_group *table_group; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 652 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 653 | mutex_lock(&container->lock); |
| 654 | |
| 655 | /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n", |
| 656 | iommu_group_id(iommu_group), iommu_group); */ |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 657 | if (container->grp) { |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 658 | pr_warn("tce_vfio: Only one group per IOMMU container is allowed, existing id=%d, attaching id=%d\n", |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 659 | iommu_group_id(container->grp), |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 660 | iommu_group_id(iommu_group)); |
| 661 | ret = -EBUSY; |
Alexey Kardashevskiy | 22af485 | 2015-06-05 16:35:04 +1000 | [diff] [blame] | 662 | goto unlock_exit; |
| 663 | } |
| 664 | |
| 665 | if (container->enabled) { |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 666 | pr_err("tce_vfio: attaching group #%u to enabled container\n", |
| 667 | iommu_group_id(iommu_group)); |
| 668 | ret = -EBUSY; |
Alexey Kardashevskiy | 22af485 | 2015-06-05 16:35:04 +1000 | [diff] [blame] | 669 | goto unlock_exit; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 670 | } |
| 671 | |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 672 | table_group = iommu_group_get_iommudata(iommu_group); |
| 673 | if (!table_group) { |
| 674 | ret = -ENXIO; |
| 675 | goto unlock_exit; |
| 676 | } |
| 677 | |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 678 | if (!table_group->ops || !table_group->ops->take_ownership || |
| 679 | !table_group->ops->release_ownership) |
| 680 | ret = tce_iommu_take_ownership(container, table_group); |
| 681 | else |
| 682 | ret = tce_iommu_take_ownership_ddw(container, table_group); |
| 683 | |
Alexey Kardashevskiy | 22af485 | 2015-06-05 16:35:04 +1000 | [diff] [blame] | 684 | if (!ret) |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 685 | container->grp = iommu_group; |
Alexey Kardashevskiy | 22af485 | 2015-06-05 16:35:04 +1000 | [diff] [blame] | 686 | |
| 687 | unlock_exit: |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 688 | mutex_unlock(&container->lock); |
| 689 | |
| 690 | return ret; |
| 691 | } |
| 692 | |
| 693 | static void tce_iommu_detach_group(void *iommu_data, |
| 694 | struct iommu_group *iommu_group) |
| 695 | { |
| 696 | struct tce_container *container = iommu_data; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 697 | struct iommu_table_group *table_group; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 698 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 699 | mutex_lock(&container->lock); |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 700 | if (iommu_group != container->grp) { |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 701 | pr_warn("tce_vfio: detaching group #%u, expected group is #%u\n", |
| 702 | iommu_group_id(iommu_group), |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 703 | iommu_group_id(container->grp)); |
Alexey Kardashevskiy | 22af485 | 2015-06-05 16:35:04 +1000 | [diff] [blame] | 704 | goto unlock_exit; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 705 | } |
Alexey Kardashevskiy | 22af485 | 2015-06-05 16:35:04 +1000 | [diff] [blame] | 706 | |
| 707 | if (container->enabled) { |
| 708 | pr_warn("tce_vfio: detaching group #%u from enabled container, forcing disable\n", |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 709 | iommu_group_id(container->grp)); |
Alexey Kardashevskiy | 22af485 | 2015-06-05 16:35:04 +1000 | [diff] [blame] | 710 | tce_iommu_disable(container); |
| 711 | } |
| 712 | |
| 713 | /* pr_debug("tce_vfio: detaching group #%u from iommu %p\n", |
| 714 | iommu_group_id(iommu_group), iommu_group); */ |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 715 | container->grp = NULL; |
| 716 | |
| 717 | table_group = iommu_group_get_iommudata(iommu_group); |
| 718 | BUG_ON(!table_group); |
| 719 | |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 720 | if (!table_group->ops || !table_group->ops->release_ownership) |
| 721 | tce_iommu_release_ownership(container, table_group); |
| 722 | else |
| 723 | tce_iommu_release_ownership_ddw(container, table_group); |
Alexey Kardashevskiy | 22af485 | 2015-06-05 16:35:04 +1000 | [diff] [blame] | 724 | |
| 725 | unlock_exit: |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 726 | mutex_unlock(&container->lock); |
| 727 | } |
| 728 | |
| 729 | const struct vfio_iommu_driver_ops tce_iommu_driver_ops = { |
| 730 | .name = "iommu-vfio-powerpc", |
| 731 | .owner = THIS_MODULE, |
| 732 | .open = tce_iommu_open, |
| 733 | .release = tce_iommu_release, |
| 734 | .ioctl = tce_iommu_ioctl, |
| 735 | .attach_group = tce_iommu_attach_group, |
| 736 | .detach_group = tce_iommu_detach_group, |
| 737 | }; |
| 738 | |
| 739 | static int __init tce_iommu_init(void) |
| 740 | { |
| 741 | return vfio_register_iommu_driver(&tce_iommu_driver_ops); |
| 742 | } |
| 743 | |
| 744 | static void __exit tce_iommu_cleanup(void) |
| 745 | { |
| 746 | vfio_unregister_iommu_driver(&tce_iommu_driver_ops); |
| 747 | } |
| 748 | |
| 749 | module_init(tce_iommu_init); |
| 750 | module_exit(tce_iommu_cleanup); |
| 751 | |
| 752 | MODULE_VERSION(DRIVER_VERSION); |
| 753 | MODULE_LICENSE("GPL v2"); |
| 754 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 755 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 756 | |