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> |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 22 | #include <linux/vmalloc.h> |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 23 | #include <asm/iommu.h> |
| 24 | #include <asm/tce.h> |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 25 | #include <asm/mmu_context.h> |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 26 | |
| 27 | #define DRIVER_VERSION "0.1" |
| 28 | #define DRIVER_AUTHOR "aik@ozlabs.ru" |
| 29 | #define DRIVER_DESC "VFIO IOMMU SPAPR TCE" |
| 30 | |
| 31 | static void tce_iommu_detach_group(void *iommu_data, |
| 32 | struct iommu_group *iommu_group); |
| 33 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 34 | static long try_increment_locked_vm(struct mm_struct *mm, long npages) |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 35 | { |
| 36 | long ret = 0, locked, lock_limit; |
| 37 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 38 | if (WARN_ON_ONCE(!mm)) |
| 39 | return -EPERM; |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 40 | |
| 41 | if (!npages) |
| 42 | return 0; |
| 43 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 44 | down_write(&mm->mmap_sem); |
| 45 | locked = mm->locked_vm + npages; |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 46 | lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; |
| 47 | if (locked > lock_limit && !capable(CAP_IPC_LOCK)) |
| 48 | ret = -ENOMEM; |
| 49 | else |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 50 | mm->locked_vm += npages; |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 51 | |
| 52 | pr_debug("[%d] RLIMIT_MEMLOCK +%ld %ld/%ld%s\n", current->pid, |
| 53 | npages << PAGE_SHIFT, |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 54 | mm->locked_vm << PAGE_SHIFT, |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 55 | rlimit(RLIMIT_MEMLOCK), |
| 56 | ret ? " - exceeded" : ""); |
| 57 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 58 | up_write(&mm->mmap_sem); |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 59 | |
| 60 | return ret; |
| 61 | } |
| 62 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 63 | static void decrement_locked_vm(struct mm_struct *mm, long npages) |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 64 | { |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 65 | if (!mm || !npages) |
| 66 | return; |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 67 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 68 | down_write(&mm->mmap_sem); |
| 69 | if (WARN_ON_ONCE(npages > mm->locked_vm)) |
| 70 | npages = mm->locked_vm; |
| 71 | mm->locked_vm -= npages; |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 72 | pr_debug("[%d] RLIMIT_MEMLOCK -%ld %ld/%ld\n", current->pid, |
| 73 | npages << PAGE_SHIFT, |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 74 | mm->locked_vm << PAGE_SHIFT, |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 75 | rlimit(RLIMIT_MEMLOCK)); |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 76 | up_write(&mm->mmap_sem); |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 77 | } |
| 78 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 79 | /* |
| 80 | * VFIO IOMMU fd for SPAPR_TCE IOMMU implementation |
| 81 | * |
| 82 | * This code handles mapping and unmapping of user data buffers |
| 83 | * into DMA'ble space using the IOMMU |
| 84 | */ |
| 85 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 86 | struct tce_iommu_group { |
| 87 | struct list_head next; |
| 88 | struct iommu_group *grp; |
| 89 | }; |
| 90 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 91 | /* |
Alexey Kardashevskiy | 080eb13 | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 92 | * A container needs to remember which preregistered region it has |
| 93 | * referenced to do proper cleanup at the userspace process exit. |
| 94 | */ |
| 95 | struct tce_iommu_prereg { |
| 96 | struct list_head next; |
| 97 | struct mm_iommu_table_group_mem_t *mem; |
| 98 | }; |
| 99 | |
| 100 | /* |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 101 | * The container descriptor supports only a single group per container. |
| 102 | * Required by the API as the container is not supplied with the IOMMU group |
| 103 | * at the moment of initialization. |
| 104 | */ |
| 105 | struct tce_container { |
| 106 | struct mutex lock; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 107 | bool enabled; |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 108 | bool v2; |
Alexey Kardashevskiy | 53e1896 | 2017-03-17 00:48:29 +0000 | [diff] [blame] | 109 | bool def_window_pending; |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 110 | unsigned long locked_pages; |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 111 | struct mm_struct *mm; |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 112 | struct iommu_table *tables[IOMMU_TABLE_GROUP_MAX_TABLES]; |
| 113 | struct list_head group_list; |
Alexey Kardashevskiy | 080eb13 | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 114 | struct list_head prereg_list; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 115 | }; |
| 116 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 117 | static long tce_iommu_mm_set(struct tce_container *container) |
| 118 | { |
| 119 | if (container->mm) { |
| 120 | if (container->mm == current->mm) |
| 121 | return 0; |
| 122 | return -EPERM; |
| 123 | } |
| 124 | BUG_ON(!current->mm); |
| 125 | container->mm = current->mm; |
| 126 | atomic_inc(&container->mm->mm_count); |
| 127 | |
| 128 | return 0; |
| 129 | } |
| 130 | |
Alexey Kardashevskiy | 080eb13 | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 131 | static long tce_iommu_prereg_free(struct tce_container *container, |
| 132 | struct tce_iommu_prereg *tcemem) |
| 133 | { |
| 134 | long ret; |
| 135 | |
| 136 | ret = mm_iommu_put(container->mm, tcemem->mem); |
| 137 | if (ret) |
| 138 | return ret; |
| 139 | |
| 140 | list_del(&tcemem->next); |
| 141 | kfree(tcemem); |
| 142 | |
| 143 | return 0; |
| 144 | } |
| 145 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 146 | static long tce_iommu_unregister_pages(struct tce_container *container, |
| 147 | __u64 vaddr, __u64 size) |
| 148 | { |
| 149 | struct mm_iommu_table_group_mem_t *mem; |
Alexey Kardashevskiy | 080eb13 | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 150 | struct tce_iommu_prereg *tcemem; |
| 151 | bool found = false; |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 152 | |
| 153 | if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK)) |
| 154 | return -EINVAL; |
| 155 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 156 | mem = mm_iommu_find(container->mm, vaddr, size >> PAGE_SHIFT); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 157 | if (!mem) |
| 158 | return -ENOENT; |
| 159 | |
Alexey Kardashevskiy | 080eb13 | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 160 | list_for_each_entry(tcemem, &container->prereg_list, next) { |
| 161 | if (tcemem->mem == mem) { |
| 162 | found = true; |
| 163 | break; |
| 164 | } |
| 165 | } |
| 166 | |
| 167 | if (!found) |
| 168 | return -ENOENT; |
| 169 | |
| 170 | return tce_iommu_prereg_free(container, tcemem); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 171 | } |
| 172 | |
| 173 | static long tce_iommu_register_pages(struct tce_container *container, |
| 174 | __u64 vaddr, __u64 size) |
| 175 | { |
| 176 | long ret = 0; |
| 177 | struct mm_iommu_table_group_mem_t *mem = NULL; |
Alexey Kardashevskiy | 080eb13 | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 178 | struct tce_iommu_prereg *tcemem; |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 179 | unsigned long entries = size >> PAGE_SHIFT; |
| 180 | |
| 181 | if ((vaddr & ~PAGE_MASK) || (size & ~PAGE_MASK) || |
| 182 | ((vaddr + size) < vaddr)) |
| 183 | return -EINVAL; |
| 184 | |
Alexey Kardashevskiy | 080eb13 | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 185 | mem = mm_iommu_find(container->mm, vaddr, entries); |
| 186 | if (mem) { |
| 187 | list_for_each_entry(tcemem, &container->prereg_list, next) { |
| 188 | if (tcemem->mem == mem) |
| 189 | return -EBUSY; |
| 190 | } |
| 191 | } |
| 192 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 193 | ret = mm_iommu_get(container->mm, vaddr, entries, &mem); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 194 | if (ret) |
| 195 | return ret; |
| 196 | |
Alexey Kardashevskiy | 080eb13 | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 197 | tcemem = kzalloc(sizeof(*tcemem), GFP_KERNEL); |
Alexey Kardashevskiy | bab8ac1 | 2017-03-27 14:23:40 +1100 | [diff] [blame] | 198 | if (!tcemem) { |
| 199 | mm_iommu_put(container->mm, mem); |
| 200 | return -ENOMEM; |
| 201 | } |
| 202 | |
Alexey Kardashevskiy | 080eb13 | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 203 | tcemem->mem = mem; |
| 204 | list_add(&tcemem->next, &container->prereg_list); |
| 205 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 206 | container->enabled = true; |
| 207 | |
| 208 | return 0; |
| 209 | } |
| 210 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 211 | static long tce_iommu_userspace_view_alloc(struct iommu_table *tbl, |
| 212 | struct mm_struct *mm) |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 213 | { |
| 214 | unsigned long cb = _ALIGN_UP(sizeof(tbl->it_userspace[0]) * |
| 215 | tbl->it_size, PAGE_SIZE); |
| 216 | unsigned long *uas; |
| 217 | long ret; |
| 218 | |
| 219 | BUG_ON(tbl->it_userspace); |
| 220 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 221 | ret = try_increment_locked_vm(mm, cb >> PAGE_SHIFT); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 222 | if (ret) |
| 223 | return ret; |
| 224 | |
| 225 | uas = vzalloc(cb); |
| 226 | if (!uas) { |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 227 | decrement_locked_vm(mm, cb >> PAGE_SHIFT); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 228 | return -ENOMEM; |
| 229 | } |
| 230 | tbl->it_userspace = uas; |
| 231 | |
| 232 | return 0; |
| 233 | } |
| 234 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 235 | static void tce_iommu_userspace_view_free(struct iommu_table *tbl, |
| 236 | struct mm_struct *mm) |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 237 | { |
| 238 | unsigned long cb = _ALIGN_UP(sizeof(tbl->it_userspace[0]) * |
| 239 | tbl->it_size, PAGE_SIZE); |
| 240 | |
| 241 | if (!tbl->it_userspace) |
| 242 | return; |
| 243 | |
| 244 | vfree(tbl->it_userspace); |
| 245 | tbl->it_userspace = NULL; |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 246 | decrement_locked_vm(mm, cb >> PAGE_SHIFT); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 247 | } |
| 248 | |
Alexey Kardashevskiy | e432bc7 | 2015-06-05 16:34:59 +1000 | [diff] [blame] | 249 | static bool tce_page_is_contained(struct page *page, unsigned page_shift) |
| 250 | { |
| 251 | /* |
| 252 | * Check that the TCE table granularity is not bigger than the size of |
| 253 | * a page we just found. Otherwise the hardware can get access to |
| 254 | * a bigger memory chunk that it should. |
| 255 | */ |
| 256 | return (PAGE_SHIFT + compound_order(compound_head(page))) >= page_shift; |
| 257 | } |
| 258 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 259 | static inline bool tce_groups_attached(struct tce_container *container) |
| 260 | { |
| 261 | return !list_empty(&container->group_list); |
| 262 | } |
| 263 | |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 264 | static long tce_iommu_find_table(struct tce_container *container, |
| 265 | phys_addr_t ioba, struct iommu_table **ptbl) |
| 266 | { |
| 267 | long i; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 268 | |
| 269 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 270 | struct iommu_table *tbl = container->tables[i]; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 271 | |
| 272 | if (tbl) { |
| 273 | unsigned long entry = ioba >> tbl->it_page_shift; |
| 274 | unsigned long start = tbl->it_offset; |
| 275 | unsigned long end = start + tbl->it_size; |
| 276 | |
| 277 | if ((start <= entry) && (entry < end)) { |
| 278 | *ptbl = tbl; |
| 279 | return i; |
| 280 | } |
| 281 | } |
| 282 | } |
| 283 | |
| 284 | return -1; |
| 285 | } |
| 286 | |
Alexey Kardashevskiy | e633bc8 | 2015-06-05 16:35:26 +1000 | [diff] [blame] | 287 | static int tce_iommu_find_free_table(struct tce_container *container) |
| 288 | { |
| 289 | int i; |
| 290 | |
| 291 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { |
| 292 | if (!container->tables[i]) |
| 293 | return i; |
| 294 | } |
| 295 | |
| 296 | return -ENOSPC; |
| 297 | } |
| 298 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 299 | static int tce_iommu_enable(struct tce_container *container) |
| 300 | { |
| 301 | int ret = 0; |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 302 | unsigned long locked; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 303 | struct iommu_table_group *table_group; |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 304 | struct tce_iommu_group *tcegrp; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 305 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 306 | if (container->enabled) |
| 307 | return -EBUSY; |
| 308 | |
| 309 | /* |
| 310 | * When userspace pages are mapped into the IOMMU, they are effectively |
| 311 | * locked memory, so, theoretically, we need to update the accounting |
| 312 | * of locked pages on each map and unmap. For powerpc, the map unmap |
| 313 | * paths can be very hot, though, and the accounting would kill |
| 314 | * performance, especially since it would be difficult to impossible |
| 315 | * to handle the accounting in real mode only. |
| 316 | * |
| 317 | * To address that, rather than precisely accounting every page, we |
| 318 | * instead account for a worst case on locked memory when the iommu is |
| 319 | * enabled and disabled. The worst case upper bound on locked memory |
| 320 | * is the size of the whole iommu window, which is usually relatively |
| 321 | * small (compared to total memory sizes) on POWER hardware. |
| 322 | * |
| 323 | * Also we don't have a nice way to fail on H_PUT_TCE due to ulimits, |
| 324 | * that would effectively kill the guest at random points, much better |
| 325 | * enforcing the limit based on the max that the guest can map. |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 326 | * |
| 327 | * Unfortunately at the moment it counts whole tables, no matter how |
| 328 | * much memory the guest has. I.e. for 4GB guest and 4 IOMMU groups |
| 329 | * each with 2GB DMA window, 8GB will be counted here. The reason for |
| 330 | * this is that we cannot tell here the amount of RAM used by the guest |
| 331 | * as this information is only available from KVM and VFIO is |
| 332 | * KVM agnostic. |
Alexey Kardashevskiy | 4793d65 | 2015-06-05 16:35:20 +1000 | [diff] [blame] | 333 | * |
| 334 | * So we do not allow enabling a container without a group attached |
| 335 | * as there is no way to know how much we should increment |
| 336 | * the locked_vm counter. |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 337 | */ |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 338 | if (!tce_groups_attached(container)) |
| 339 | return -ENODEV; |
| 340 | |
| 341 | tcegrp = list_first_entry(&container->group_list, |
| 342 | struct tce_iommu_group, next); |
| 343 | table_group = iommu_group_get_iommudata(tcegrp->grp); |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 344 | if (!table_group) |
| 345 | return -ENODEV; |
| 346 | |
Alexey Kardashevskiy | 4793d65 | 2015-06-05 16:35:20 +1000 | [diff] [blame] | 347 | if (!table_group->tce32_size) |
| 348 | return -EPERM; |
| 349 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 350 | ret = tce_iommu_mm_set(container); |
| 351 | if (ret) |
| 352 | return ret; |
| 353 | |
Alexey Kardashevskiy | 4793d65 | 2015-06-05 16:35:20 +1000 | [diff] [blame] | 354 | locked = table_group->tce32_size >> PAGE_SHIFT; |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 355 | ret = try_increment_locked_vm(container->mm, locked); |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 356 | if (ret) |
| 357 | return ret; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 358 | |
Alexey Kardashevskiy | 2d270df | 2015-06-05 16:35:01 +1000 | [diff] [blame] | 359 | container->locked_pages = locked; |
| 360 | |
| 361 | container->enabled = true; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 362 | |
| 363 | return ret; |
| 364 | } |
| 365 | |
| 366 | static void tce_iommu_disable(struct tce_container *container) |
| 367 | { |
| 368 | if (!container->enabled) |
| 369 | return; |
| 370 | |
| 371 | container->enabled = false; |
| 372 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 373 | BUG_ON(!container->mm); |
| 374 | decrement_locked_vm(container->mm, container->locked_pages); |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 375 | } |
| 376 | |
| 377 | static void *tce_iommu_open(unsigned long arg) |
| 378 | { |
| 379 | struct tce_container *container; |
| 380 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 381 | if ((arg != VFIO_SPAPR_TCE_IOMMU) && (arg != VFIO_SPAPR_TCE_v2_IOMMU)) { |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 382 | pr_err("tce_vfio: Wrong IOMMU type\n"); |
| 383 | return ERR_PTR(-EINVAL); |
| 384 | } |
| 385 | |
| 386 | container = kzalloc(sizeof(*container), GFP_KERNEL); |
| 387 | if (!container) |
| 388 | return ERR_PTR(-ENOMEM); |
| 389 | |
| 390 | mutex_init(&container->lock); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 391 | INIT_LIST_HEAD_RCU(&container->group_list); |
Alexey Kardashevskiy | 080eb13 | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 392 | INIT_LIST_HEAD_RCU(&container->prereg_list); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 393 | |
| 394 | container->v2 = arg == VFIO_SPAPR_TCE_v2_IOMMU; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 395 | |
| 396 | return container; |
| 397 | } |
| 398 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 399 | static int tce_iommu_clear(struct tce_container *container, |
| 400 | struct iommu_table *tbl, |
| 401 | unsigned long entry, unsigned long pages); |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 402 | static void tce_iommu_free_table(struct tce_container *container, |
| 403 | struct iommu_table *tbl); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 404 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 405 | static void tce_iommu_release(void *iommu_data) |
| 406 | { |
| 407 | struct tce_container *container = iommu_data; |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 408 | struct tce_iommu_group *tcegrp; |
| 409 | long i; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 410 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 411 | while (tce_groups_attached(container)) { |
| 412 | tcegrp = list_first_entry(&container->group_list, |
| 413 | struct tce_iommu_group, next); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 414 | tce_iommu_detach_group(iommu_data, tcegrp->grp); |
| 415 | } |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 416 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 417 | /* |
| 418 | * If VFIO created a table, it was not disposed |
| 419 | * by tce_iommu_detach_group() so do it now. |
| 420 | */ |
| 421 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { |
| 422 | struct iommu_table *tbl = container->tables[i]; |
| 423 | |
| 424 | if (!tbl) |
| 425 | continue; |
| 426 | |
| 427 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 428 | tce_iommu_free_table(container, tbl); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 429 | } |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 430 | |
Alexey Kardashevskiy | 080eb13 | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 431 | while (!list_empty(&container->prereg_list)) { |
| 432 | struct tce_iommu_prereg *tcemem; |
| 433 | |
| 434 | tcemem = list_first_entry(&container->prereg_list, |
| 435 | struct tce_iommu_prereg, next); |
| 436 | WARN_ON_ONCE(tce_iommu_prereg_free(container, tcemem)); |
| 437 | } |
| 438 | |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 439 | tce_iommu_disable(container); |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 440 | if (container->mm) |
| 441 | mmdrop(container->mm); |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 442 | mutex_destroy(&container->lock); |
| 443 | |
| 444 | kfree(container); |
| 445 | } |
| 446 | |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 447 | static void tce_iommu_unuse_page(struct tce_container *container, |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 448 | unsigned long hpa) |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 449 | { |
| 450 | struct page *page; |
| 451 | |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 452 | page = pfn_to_page(hpa >> PAGE_SHIFT); |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 453 | put_page(page); |
| 454 | } |
| 455 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 456 | static int tce_iommu_prereg_ua_to_hpa(struct tce_container *container, |
| 457 | unsigned long tce, unsigned long size, |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 458 | unsigned long *phpa, struct mm_iommu_table_group_mem_t **pmem) |
| 459 | { |
| 460 | long ret = 0; |
| 461 | struct mm_iommu_table_group_mem_t *mem; |
| 462 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 463 | mem = mm_iommu_lookup(container->mm, tce, size); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 464 | if (!mem) |
| 465 | return -EINVAL; |
| 466 | |
| 467 | ret = mm_iommu_ua_to_hpa(mem, tce, phpa); |
| 468 | if (ret) |
| 469 | return -EINVAL; |
| 470 | |
| 471 | *pmem = mem; |
| 472 | |
| 473 | return 0; |
| 474 | } |
| 475 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 476 | static void tce_iommu_unuse_page_v2(struct tce_container *container, |
| 477 | struct iommu_table *tbl, unsigned long entry) |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 478 | { |
| 479 | struct mm_iommu_table_group_mem_t *mem = NULL; |
| 480 | int ret; |
| 481 | unsigned long hpa = 0; |
| 482 | unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, entry); |
| 483 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 484 | if (!pua) |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 485 | return; |
| 486 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 487 | ret = tce_iommu_prereg_ua_to_hpa(container, *pua, IOMMU_PAGE_SIZE(tbl), |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 488 | &hpa, &mem); |
| 489 | if (ret) |
| 490 | pr_debug("%s: tce %lx at #%lx was not cached, ret=%d\n", |
| 491 | __func__, *pua, entry, ret); |
| 492 | if (mem) |
| 493 | mm_iommu_mapped_dec(mem); |
| 494 | |
| 495 | *pua = 0; |
| 496 | } |
| 497 | |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 498 | static int tce_iommu_clear(struct tce_container *container, |
| 499 | struct iommu_table *tbl, |
| 500 | unsigned long entry, unsigned long pages) |
| 501 | { |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 502 | unsigned long oldhpa; |
| 503 | long ret; |
| 504 | enum dma_data_direction direction; |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 505 | |
| 506 | for ( ; pages; --pages, ++entry) { |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 507 | direction = DMA_NONE; |
| 508 | oldhpa = 0; |
| 509 | ret = iommu_tce_xchg(tbl, entry, &oldhpa, &direction); |
| 510 | if (ret) |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 511 | continue; |
| 512 | |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 513 | if (direction == DMA_NONE) |
| 514 | continue; |
| 515 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 516 | if (container->v2) { |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 517 | tce_iommu_unuse_page_v2(container, tbl, entry); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 518 | continue; |
| 519 | } |
| 520 | |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 521 | tce_iommu_unuse_page(container, oldhpa); |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 522 | } |
| 523 | |
| 524 | return 0; |
| 525 | } |
| 526 | |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 527 | static int tce_iommu_use_page(unsigned long tce, unsigned long *hpa) |
| 528 | { |
| 529 | struct page *page = NULL; |
| 530 | enum dma_data_direction direction = iommu_tce_direction(tce); |
| 531 | |
| 532 | if (get_user_pages_fast(tce & PAGE_MASK, 1, |
| 533 | direction != DMA_TO_DEVICE, &page) != 1) |
| 534 | return -EFAULT; |
| 535 | |
| 536 | *hpa = __pa((unsigned long) page_address(page)); |
| 537 | |
| 538 | return 0; |
| 539 | } |
| 540 | |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 541 | static long tce_iommu_build(struct tce_container *container, |
| 542 | struct iommu_table *tbl, |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 543 | unsigned long entry, unsigned long tce, unsigned long pages, |
| 544 | enum dma_data_direction direction) |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 545 | { |
| 546 | long i, ret = 0; |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 547 | struct page *page; |
| 548 | unsigned long hpa; |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 549 | enum dma_data_direction dirtmp; |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 550 | |
| 551 | for (i = 0; i < pages; ++i) { |
| 552 | unsigned long offset = tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK; |
| 553 | |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 554 | ret = tce_iommu_use_page(tce, &hpa); |
| 555 | if (ret) |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 556 | break; |
Alexey Kardashevskiy | e432bc7 | 2015-06-05 16:34:59 +1000 | [diff] [blame] | 557 | |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 558 | page = pfn_to_page(hpa >> PAGE_SHIFT); |
Alexey Kardashevskiy | e432bc7 | 2015-06-05 16:34:59 +1000 | [diff] [blame] | 559 | if (!tce_page_is_contained(page, tbl->it_page_shift)) { |
| 560 | ret = -EPERM; |
| 561 | break; |
| 562 | } |
| 563 | |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 564 | hpa |= offset; |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 565 | dirtmp = direction; |
| 566 | ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp); |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 567 | if (ret) { |
Alexey Kardashevskiy | 649354b | 2015-06-05 16:35:03 +1000 | [diff] [blame] | 568 | tce_iommu_unuse_page(container, hpa); |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 569 | pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n", |
| 570 | __func__, entry << tbl->it_page_shift, |
| 571 | tce, ret); |
| 572 | break; |
| 573 | } |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 574 | |
| 575 | if (dirtmp != DMA_NONE) |
| 576 | tce_iommu_unuse_page(container, hpa); |
| 577 | |
Alexey Kardashevskiy | 00663d4 | 2015-06-05 16:35:00 +1000 | [diff] [blame] | 578 | tce += IOMMU_PAGE_SIZE(tbl); |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 579 | } |
| 580 | |
| 581 | if (ret) |
| 582 | tce_iommu_clear(container, tbl, entry, i); |
| 583 | |
| 584 | return ret; |
| 585 | } |
| 586 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 587 | static long tce_iommu_build_v2(struct tce_container *container, |
| 588 | struct iommu_table *tbl, |
| 589 | unsigned long entry, unsigned long tce, unsigned long pages, |
| 590 | enum dma_data_direction direction) |
| 591 | { |
| 592 | long i, ret = 0; |
| 593 | struct page *page; |
| 594 | unsigned long hpa; |
| 595 | enum dma_data_direction dirtmp; |
| 596 | |
Alexey Kardashevskiy | 5d8b3e7 | 2017-03-17 00:48:26 +0000 | [diff] [blame] | 597 | if (!tbl->it_userspace) { |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 598 | ret = tce_iommu_userspace_view_alloc(tbl, container->mm); |
Alexey Kardashevskiy | 5d8b3e7 | 2017-03-17 00:48:26 +0000 | [diff] [blame] | 599 | if (ret) |
| 600 | return ret; |
| 601 | } |
| 602 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 603 | for (i = 0; i < pages; ++i) { |
| 604 | struct mm_iommu_table_group_mem_t *mem = NULL; |
| 605 | unsigned long *pua = IOMMU_TABLE_USERSPACE_ENTRY(tbl, |
| 606 | entry + i); |
| 607 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 608 | ret = tce_iommu_prereg_ua_to_hpa(container, |
| 609 | tce, IOMMU_PAGE_SIZE(tbl), &hpa, &mem); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 610 | if (ret) |
| 611 | break; |
| 612 | |
| 613 | page = pfn_to_page(hpa >> PAGE_SHIFT); |
| 614 | if (!tce_page_is_contained(page, tbl->it_page_shift)) { |
| 615 | ret = -EPERM; |
| 616 | break; |
| 617 | } |
| 618 | |
| 619 | /* Preserve offset within IOMMU page */ |
| 620 | hpa |= tce & IOMMU_PAGE_MASK(tbl) & ~PAGE_MASK; |
| 621 | dirtmp = direction; |
| 622 | |
| 623 | /* The registered region is being unregistered */ |
| 624 | if (mm_iommu_mapped_inc(mem)) |
| 625 | break; |
| 626 | |
| 627 | ret = iommu_tce_xchg(tbl, entry + i, &hpa, &dirtmp); |
| 628 | if (ret) { |
| 629 | /* dirtmp cannot be DMA_NONE here */ |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 630 | tce_iommu_unuse_page_v2(container, tbl, entry + i); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 631 | pr_err("iommu_tce: %s failed ioba=%lx, tce=%lx, ret=%ld\n", |
| 632 | __func__, entry << tbl->it_page_shift, |
| 633 | tce, ret); |
| 634 | break; |
| 635 | } |
| 636 | |
| 637 | if (dirtmp != DMA_NONE) |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 638 | tce_iommu_unuse_page_v2(container, tbl, entry + i); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 639 | |
| 640 | *pua = tce; |
| 641 | |
| 642 | tce += IOMMU_PAGE_SIZE(tbl); |
| 643 | } |
| 644 | |
| 645 | if (ret) |
| 646 | tce_iommu_clear(container, tbl, entry, i); |
| 647 | |
| 648 | return ret; |
| 649 | } |
| 650 | |
Alexey Kardashevskiy | 46d3e1e | 2015-06-05 16:35:23 +1000 | [diff] [blame] | 651 | static long tce_iommu_create_table(struct tce_container *container, |
| 652 | struct iommu_table_group *table_group, |
| 653 | int num, |
| 654 | __u32 page_shift, |
| 655 | __u64 window_size, |
| 656 | __u32 levels, |
| 657 | struct iommu_table **ptbl) |
| 658 | { |
| 659 | long ret, table_size; |
| 660 | |
| 661 | table_size = table_group->ops->get_table_size(page_shift, window_size, |
| 662 | levels); |
| 663 | if (!table_size) |
| 664 | return -EINVAL; |
| 665 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 666 | ret = try_increment_locked_vm(container->mm, table_size >> PAGE_SHIFT); |
Alexey Kardashevskiy | 46d3e1e | 2015-06-05 16:35:23 +1000 | [diff] [blame] | 667 | if (ret) |
| 668 | return ret; |
| 669 | |
| 670 | ret = table_group->ops->create_table(table_group, num, |
| 671 | page_shift, window_size, levels, ptbl); |
| 672 | |
| 673 | WARN_ON(!ret && !(*ptbl)->it_ops->free); |
| 674 | WARN_ON(!ret && ((*ptbl)->it_allocated_size != table_size)); |
| 675 | |
Alexey Kardashevskiy | 46d3e1e | 2015-06-05 16:35:23 +1000 | [diff] [blame] | 676 | return ret; |
| 677 | } |
| 678 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 679 | static void tce_iommu_free_table(struct tce_container *container, |
| 680 | struct iommu_table *tbl) |
Alexey Kardashevskiy | 46d3e1e | 2015-06-05 16:35:23 +1000 | [diff] [blame] | 681 | { |
| 682 | unsigned long pages = tbl->it_allocated_size >> PAGE_SHIFT; |
| 683 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 684 | tce_iommu_userspace_view_free(tbl, container->mm); |
Alexey Kardashevskiy | 46d3e1e | 2015-06-05 16:35:23 +1000 | [diff] [blame] | 685 | tbl->it_ops->free(tbl); |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 686 | decrement_locked_vm(container->mm, pages); |
Alexey Kardashevskiy | 46d3e1e | 2015-06-05 16:35:23 +1000 | [diff] [blame] | 687 | } |
| 688 | |
Alexey Kardashevskiy | e633bc8 | 2015-06-05 16:35:26 +1000 | [diff] [blame] | 689 | static long tce_iommu_create_window(struct tce_container *container, |
| 690 | __u32 page_shift, __u64 window_size, __u32 levels, |
| 691 | __u64 *start_addr) |
| 692 | { |
| 693 | struct tce_iommu_group *tcegrp; |
| 694 | struct iommu_table_group *table_group; |
| 695 | struct iommu_table *tbl = NULL; |
| 696 | long ret, num; |
| 697 | |
| 698 | num = tce_iommu_find_free_table(container); |
| 699 | if (num < 0) |
| 700 | return num; |
| 701 | |
| 702 | /* Get the first group for ops::create_table */ |
| 703 | tcegrp = list_first_entry(&container->group_list, |
| 704 | struct tce_iommu_group, next); |
| 705 | table_group = iommu_group_get_iommudata(tcegrp->grp); |
| 706 | if (!table_group) |
| 707 | return -EFAULT; |
| 708 | |
| 709 | if (!(table_group->pgsizes & (1ULL << page_shift))) |
| 710 | return -EINVAL; |
| 711 | |
| 712 | if (!table_group->ops->set_window || !table_group->ops->unset_window || |
| 713 | !table_group->ops->get_table_size || |
| 714 | !table_group->ops->create_table) |
| 715 | return -EPERM; |
| 716 | |
| 717 | /* Create TCE table */ |
| 718 | ret = tce_iommu_create_table(container, table_group, num, |
| 719 | page_shift, window_size, levels, &tbl); |
| 720 | if (ret) |
| 721 | return ret; |
| 722 | |
| 723 | BUG_ON(!tbl->it_ops->free); |
| 724 | |
| 725 | /* |
| 726 | * Program the table to every group. |
| 727 | * Groups have been tested for compatibility at the attach time. |
| 728 | */ |
| 729 | list_for_each_entry(tcegrp, &container->group_list, next) { |
| 730 | table_group = iommu_group_get_iommudata(tcegrp->grp); |
| 731 | |
| 732 | ret = table_group->ops->set_window(table_group, num, tbl); |
| 733 | if (ret) |
| 734 | goto unset_exit; |
| 735 | } |
| 736 | |
| 737 | container->tables[num] = tbl; |
| 738 | |
| 739 | /* Return start address assigned by platform in create_table() */ |
| 740 | *start_addr = tbl->it_offset << tbl->it_page_shift; |
| 741 | |
| 742 | return 0; |
| 743 | |
| 744 | unset_exit: |
| 745 | list_for_each_entry(tcegrp, &container->group_list, next) { |
| 746 | table_group = iommu_group_get_iommudata(tcegrp->grp); |
| 747 | table_group->ops->unset_window(table_group, num); |
| 748 | } |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 749 | tce_iommu_free_table(container, tbl); |
Alexey Kardashevskiy | e633bc8 | 2015-06-05 16:35:26 +1000 | [diff] [blame] | 750 | |
| 751 | return ret; |
| 752 | } |
| 753 | |
| 754 | static long tce_iommu_remove_window(struct tce_container *container, |
| 755 | __u64 start_addr) |
| 756 | { |
| 757 | struct iommu_table_group *table_group = NULL; |
| 758 | struct iommu_table *tbl; |
| 759 | struct tce_iommu_group *tcegrp; |
| 760 | int num; |
| 761 | |
| 762 | num = tce_iommu_find_table(container, start_addr, &tbl); |
| 763 | if (num < 0) |
| 764 | return -EINVAL; |
| 765 | |
| 766 | BUG_ON(!tbl->it_size); |
| 767 | |
| 768 | /* Detach groups from IOMMUs */ |
| 769 | list_for_each_entry(tcegrp, &container->group_list, next) { |
| 770 | table_group = iommu_group_get_iommudata(tcegrp->grp); |
| 771 | |
| 772 | /* |
| 773 | * SPAPR TCE IOMMU exposes the default DMA window to |
| 774 | * the guest via dma32_window_start/size of |
| 775 | * VFIO_IOMMU_SPAPR_TCE_GET_INFO. Some platforms allow |
| 776 | * the userspace to remove this window, some do not so |
| 777 | * here we check for the platform capability. |
| 778 | */ |
| 779 | if (!table_group->ops || !table_group->ops->unset_window) |
| 780 | return -EPERM; |
| 781 | |
| 782 | table_group->ops->unset_window(table_group, num); |
| 783 | } |
| 784 | |
| 785 | /* Free table */ |
| 786 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 787 | tce_iommu_free_table(container, tbl); |
Alexey Kardashevskiy | e633bc8 | 2015-06-05 16:35:26 +1000 | [diff] [blame] | 788 | container->tables[num] = NULL; |
| 789 | |
| 790 | return 0; |
| 791 | } |
| 792 | |
Alexey Kardashevskiy | 2e60bac | 2017-03-17 00:48:28 +0000 | [diff] [blame] | 793 | static long tce_iommu_create_default_window(struct tce_container *container) |
| 794 | { |
| 795 | long ret; |
| 796 | __u64 start_addr = 0; |
| 797 | struct tce_iommu_group *tcegrp; |
| 798 | struct iommu_table_group *table_group; |
| 799 | |
Alexey Kardashevskiy | 53e1896 | 2017-03-17 00:48:29 +0000 | [diff] [blame] | 800 | if (!container->def_window_pending) |
| 801 | return 0; |
| 802 | |
Alexey Kardashevskiy | 2e60bac | 2017-03-17 00:48:28 +0000 | [diff] [blame] | 803 | if (!tce_groups_attached(container)) |
| 804 | return -ENODEV; |
| 805 | |
| 806 | tcegrp = list_first_entry(&container->group_list, |
| 807 | struct tce_iommu_group, next); |
| 808 | table_group = iommu_group_get_iommudata(tcegrp->grp); |
| 809 | if (!table_group) |
| 810 | return -ENODEV; |
| 811 | |
| 812 | ret = tce_iommu_create_window(container, IOMMU_PAGE_SHIFT_4K, |
| 813 | table_group->tce32_size, 1, &start_addr); |
| 814 | WARN_ON_ONCE(!ret && start_addr); |
| 815 | |
Alexey Kardashevskiy | 53e1896 | 2017-03-17 00:48:29 +0000 | [diff] [blame] | 816 | if (!ret) |
| 817 | container->def_window_pending = false; |
| 818 | |
Alexey Kardashevskiy | 2e60bac | 2017-03-17 00:48:28 +0000 | [diff] [blame] | 819 | return ret; |
| 820 | } |
| 821 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 822 | static long tce_iommu_ioctl(void *iommu_data, |
| 823 | unsigned int cmd, unsigned long arg) |
| 824 | { |
| 825 | struct tce_container *container = iommu_data; |
Alexey Kardashevskiy | e633bc8 | 2015-06-05 16:35:26 +1000 | [diff] [blame] | 826 | unsigned long minsz, ddwsz; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 827 | long ret; |
| 828 | |
| 829 | switch (cmd) { |
| 830 | case VFIO_CHECK_EXTENSION: |
Gavin Shan | 1b69be5 | 2014-06-10 11:41:57 +1000 | [diff] [blame] | 831 | switch (arg) { |
| 832 | case VFIO_SPAPR_TCE_IOMMU: |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 833 | case VFIO_SPAPR_TCE_v2_IOMMU: |
Gavin Shan | 1b69be5 | 2014-06-10 11:41:57 +1000 | [diff] [blame] | 834 | ret = 1; |
| 835 | break; |
| 836 | default: |
| 837 | ret = vfio_spapr_iommu_eeh_ioctl(NULL, cmd, arg); |
| 838 | break; |
| 839 | } |
| 840 | |
| 841 | return (ret < 0) ? 0 : ret; |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 842 | } |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 843 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 844 | /* |
| 845 | * Sanity check to prevent one userspace from manipulating |
| 846 | * another userspace mm. |
| 847 | */ |
| 848 | BUG_ON(!container); |
| 849 | if (container->mm && container->mm != current->mm) |
| 850 | return -EPERM; |
| 851 | |
| 852 | switch (cmd) { |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 853 | case VFIO_IOMMU_SPAPR_TCE_GET_INFO: { |
| 854 | struct vfio_iommu_spapr_tce_info info; |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 855 | struct tce_iommu_group *tcegrp; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 856 | struct iommu_table_group *table_group; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 857 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 858 | if (!tce_groups_attached(container)) |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 859 | return -ENXIO; |
| 860 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 861 | tcegrp = list_first_entry(&container->group_list, |
| 862 | struct tce_iommu_group, next); |
| 863 | table_group = iommu_group_get_iommudata(tcegrp->grp); |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 864 | |
Alexey Kardashevskiy | 4793d65 | 2015-06-05 16:35:20 +1000 | [diff] [blame] | 865 | if (!table_group) |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 866 | return -ENXIO; |
| 867 | |
| 868 | minsz = offsetofend(struct vfio_iommu_spapr_tce_info, |
| 869 | dma32_window_size); |
| 870 | |
| 871 | if (copy_from_user(&info, (void __user *)arg, minsz)) |
| 872 | return -EFAULT; |
| 873 | |
| 874 | if (info.argsz < minsz) |
| 875 | return -EINVAL; |
| 876 | |
Alexey Kardashevskiy | 4793d65 | 2015-06-05 16:35:20 +1000 | [diff] [blame] | 877 | info.dma32_window_start = table_group->tce32_start; |
| 878 | info.dma32_window_size = table_group->tce32_size; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 879 | info.flags = 0; |
Alexey Kardashevskiy | e633bc8 | 2015-06-05 16:35:26 +1000 | [diff] [blame] | 880 | memset(&info.ddw, 0, sizeof(info.ddw)); |
| 881 | |
| 882 | if (table_group->max_dynamic_windows_supported && |
| 883 | container->v2) { |
| 884 | info.flags |= VFIO_IOMMU_SPAPR_INFO_DDW; |
| 885 | info.ddw.pgsizes = table_group->pgsizes; |
| 886 | info.ddw.max_dynamic_windows_supported = |
| 887 | table_group->max_dynamic_windows_supported; |
| 888 | info.ddw.levels = table_group->max_levels; |
| 889 | } |
| 890 | |
| 891 | ddwsz = offsetofend(struct vfio_iommu_spapr_tce_info, ddw); |
| 892 | |
| 893 | if (info.argsz >= ddwsz) |
| 894 | minsz = ddwsz; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 895 | |
| 896 | if (copy_to_user((void __user *)arg, &info, minsz)) |
| 897 | return -EFAULT; |
| 898 | |
| 899 | return 0; |
| 900 | } |
| 901 | case VFIO_IOMMU_MAP_DMA: { |
| 902 | struct vfio_iommu_type1_dma_map param; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 903 | struct iommu_table *tbl = NULL; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 904 | long num; |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 905 | enum dma_data_direction direction; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 906 | |
Alexey Kardashevskiy | 3c56e82 | 2015-06-05 16:35:02 +1000 | [diff] [blame] | 907 | if (!container->enabled) |
| 908 | return -EPERM; |
| 909 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 910 | minsz = offsetofend(struct vfio_iommu_type1_dma_map, size); |
| 911 | |
| 912 | if (copy_from_user(¶m, (void __user *)arg, minsz)) |
| 913 | return -EFAULT; |
| 914 | |
| 915 | if (param.argsz < minsz) |
| 916 | return -EINVAL; |
| 917 | |
| 918 | if (param.flags & ~(VFIO_DMA_MAP_FLAG_READ | |
| 919 | VFIO_DMA_MAP_FLAG_WRITE)) |
| 920 | return -EINVAL; |
| 921 | |
Alexey Kardashevskiy | 53e1896 | 2017-03-17 00:48:29 +0000 | [diff] [blame] | 922 | ret = tce_iommu_create_default_window(container); |
| 923 | if (ret) |
| 924 | return ret; |
| 925 | |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 926 | num = tce_iommu_find_table(container, param.iova, &tbl); |
| 927 | if (num < 0) |
| 928 | return -ENXIO; |
| 929 | |
Alexey Kardashevskiy | 00663d4 | 2015-06-05 16:35:00 +1000 | [diff] [blame] | 930 | if ((param.size & ~IOMMU_PAGE_MASK(tbl)) || |
| 931 | (param.vaddr & ~IOMMU_PAGE_MASK(tbl))) |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 932 | return -EINVAL; |
| 933 | |
| 934 | /* iova is checked by the IOMMU API */ |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 935 | if (param.flags & VFIO_DMA_MAP_FLAG_READ) { |
| 936 | if (param.flags & VFIO_DMA_MAP_FLAG_WRITE) |
| 937 | direction = DMA_BIDIRECTIONAL; |
| 938 | else |
| 939 | direction = DMA_TO_DEVICE; |
| 940 | } else { |
| 941 | if (param.flags & VFIO_DMA_MAP_FLAG_WRITE) |
| 942 | direction = DMA_FROM_DEVICE; |
| 943 | else |
| 944 | return -EINVAL; |
| 945 | } |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 946 | |
Alexey Kardashevskiy | 05c6cfb | 2015-06-05 16:35:15 +1000 | [diff] [blame] | 947 | ret = iommu_tce_put_param_check(tbl, param.iova, param.vaddr); |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 948 | if (ret) |
| 949 | return ret; |
| 950 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 951 | if (container->v2) |
| 952 | ret = tce_iommu_build_v2(container, tbl, |
| 953 | param.iova >> tbl->it_page_shift, |
| 954 | param.vaddr, |
| 955 | param.size >> tbl->it_page_shift, |
| 956 | direction); |
| 957 | else |
| 958 | ret = tce_iommu_build(container, tbl, |
| 959 | param.iova >> tbl->it_page_shift, |
| 960 | param.vaddr, |
| 961 | param.size >> tbl->it_page_shift, |
| 962 | direction); |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 963 | |
| 964 | iommu_flush_tce(tbl); |
| 965 | |
| 966 | return ret; |
| 967 | } |
| 968 | case VFIO_IOMMU_UNMAP_DMA: { |
| 969 | struct vfio_iommu_type1_dma_unmap param; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 970 | struct iommu_table *tbl = NULL; |
| 971 | long num; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 972 | |
Alexey Kardashevskiy | 3c56e82 | 2015-06-05 16:35:02 +1000 | [diff] [blame] | 973 | if (!container->enabled) |
| 974 | return -EPERM; |
| 975 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 976 | minsz = offsetofend(struct vfio_iommu_type1_dma_unmap, |
| 977 | size); |
| 978 | |
| 979 | if (copy_from_user(¶m, (void __user *)arg, minsz)) |
| 980 | return -EFAULT; |
| 981 | |
| 982 | if (param.argsz < minsz) |
| 983 | return -EINVAL; |
| 984 | |
| 985 | /* No flag is supported now */ |
| 986 | if (param.flags) |
| 987 | return -EINVAL; |
| 988 | |
Alexey Kardashevskiy | 53e1896 | 2017-03-17 00:48:29 +0000 | [diff] [blame] | 989 | ret = tce_iommu_create_default_window(container); |
| 990 | if (ret) |
| 991 | return ret; |
| 992 | |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 993 | num = tce_iommu_find_table(container, param.iova, &tbl); |
| 994 | if (num < 0) |
| 995 | return -ENXIO; |
| 996 | |
Alexey Kardashevskiy | 00663d4 | 2015-06-05 16:35:00 +1000 | [diff] [blame] | 997 | if (param.size & ~IOMMU_PAGE_MASK(tbl)) |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 998 | return -EINVAL; |
| 999 | |
| 1000 | ret = iommu_tce_clear_param_check(tbl, param.iova, 0, |
Alexey Kardashevskiy | 00663d4 | 2015-06-05 16:35:00 +1000 | [diff] [blame] | 1001 | param.size >> tbl->it_page_shift); |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 1002 | if (ret) |
| 1003 | return ret; |
| 1004 | |
Alexey Kardashevskiy | 9b14a1f | 2015-06-05 16:34:58 +1000 | [diff] [blame] | 1005 | ret = tce_iommu_clear(container, tbl, |
Alexey Kardashevskiy | 00663d4 | 2015-06-05 16:35:00 +1000 | [diff] [blame] | 1006 | param.iova >> tbl->it_page_shift, |
| 1007 | param.size >> tbl->it_page_shift); |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 1008 | iommu_flush_tce(tbl); |
| 1009 | |
| 1010 | return ret; |
| 1011 | } |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1012 | case VFIO_IOMMU_SPAPR_REGISTER_MEMORY: { |
| 1013 | struct vfio_iommu_spapr_register_memory param; |
| 1014 | |
| 1015 | if (!container->v2) |
| 1016 | break; |
| 1017 | |
| 1018 | minsz = offsetofend(struct vfio_iommu_spapr_register_memory, |
| 1019 | size); |
| 1020 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 1021 | ret = tce_iommu_mm_set(container); |
| 1022 | if (ret) |
| 1023 | return ret; |
| 1024 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1025 | if (copy_from_user(¶m, (void __user *)arg, minsz)) |
| 1026 | return -EFAULT; |
| 1027 | |
| 1028 | if (param.argsz < minsz) |
| 1029 | return -EINVAL; |
| 1030 | |
| 1031 | /* No flag is supported now */ |
| 1032 | if (param.flags) |
| 1033 | return -EINVAL; |
| 1034 | |
| 1035 | mutex_lock(&container->lock); |
| 1036 | ret = tce_iommu_register_pages(container, param.vaddr, |
| 1037 | param.size); |
| 1038 | mutex_unlock(&container->lock); |
| 1039 | |
| 1040 | return ret; |
| 1041 | } |
| 1042 | case VFIO_IOMMU_SPAPR_UNREGISTER_MEMORY: { |
| 1043 | struct vfio_iommu_spapr_register_memory param; |
| 1044 | |
| 1045 | if (!container->v2) |
| 1046 | break; |
| 1047 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 1048 | if (!container->mm) |
| 1049 | return -EPERM; |
| 1050 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1051 | minsz = offsetofend(struct vfio_iommu_spapr_register_memory, |
| 1052 | size); |
| 1053 | |
| 1054 | if (copy_from_user(¶m, (void __user *)arg, minsz)) |
| 1055 | return -EFAULT; |
| 1056 | |
| 1057 | if (param.argsz < minsz) |
| 1058 | return -EINVAL; |
| 1059 | |
| 1060 | /* No flag is supported now */ |
| 1061 | if (param.flags) |
| 1062 | return -EINVAL; |
| 1063 | |
| 1064 | mutex_lock(&container->lock); |
| 1065 | ret = tce_iommu_unregister_pages(container, param.vaddr, |
| 1066 | param.size); |
| 1067 | mutex_unlock(&container->lock); |
| 1068 | |
| 1069 | return ret; |
| 1070 | } |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 1071 | case VFIO_IOMMU_ENABLE: |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1072 | if (container->v2) |
| 1073 | break; |
| 1074 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 1075 | mutex_lock(&container->lock); |
| 1076 | ret = tce_iommu_enable(container); |
| 1077 | mutex_unlock(&container->lock); |
| 1078 | return ret; |
| 1079 | |
| 1080 | |
| 1081 | case VFIO_IOMMU_DISABLE: |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1082 | if (container->v2) |
| 1083 | break; |
| 1084 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 1085 | mutex_lock(&container->lock); |
| 1086 | tce_iommu_disable(container); |
| 1087 | mutex_unlock(&container->lock); |
| 1088 | return 0; |
Gavin Shan | 1b69be5 | 2014-06-10 11:41:57 +1000 | [diff] [blame] | 1089 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1090 | case VFIO_EEH_PE_OP: { |
| 1091 | struct tce_iommu_group *tcegrp; |
| 1092 | |
| 1093 | ret = 0; |
| 1094 | list_for_each_entry(tcegrp, &container->group_list, next) { |
| 1095 | ret = vfio_spapr_iommu_eeh_ioctl(tcegrp->grp, |
| 1096 | cmd, arg); |
| 1097 | if (ret) |
| 1098 | return ret; |
| 1099 | } |
| 1100 | return ret; |
| 1101 | } |
| 1102 | |
Alexey Kardashevskiy | e633bc8 | 2015-06-05 16:35:26 +1000 | [diff] [blame] | 1103 | case VFIO_IOMMU_SPAPR_TCE_CREATE: { |
| 1104 | struct vfio_iommu_spapr_tce_create create; |
| 1105 | |
| 1106 | if (!container->v2) |
| 1107 | break; |
| 1108 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 1109 | ret = tce_iommu_mm_set(container); |
| 1110 | if (ret) |
| 1111 | return ret; |
| 1112 | |
Alexey Kardashevskiy | e633bc8 | 2015-06-05 16:35:26 +1000 | [diff] [blame] | 1113 | if (!tce_groups_attached(container)) |
| 1114 | return -ENXIO; |
| 1115 | |
| 1116 | minsz = offsetofend(struct vfio_iommu_spapr_tce_create, |
| 1117 | start_addr); |
| 1118 | |
| 1119 | if (copy_from_user(&create, (void __user *)arg, minsz)) |
| 1120 | return -EFAULT; |
| 1121 | |
| 1122 | if (create.argsz < minsz) |
| 1123 | return -EINVAL; |
| 1124 | |
| 1125 | if (create.flags) |
| 1126 | return -EINVAL; |
| 1127 | |
| 1128 | mutex_lock(&container->lock); |
| 1129 | |
Alexey Kardashevskiy | 53e1896 | 2017-03-17 00:48:29 +0000 | [diff] [blame] | 1130 | ret = tce_iommu_create_default_window(container); |
Alexey Kardashevskiy | 3e550de | 2017-02-01 14:26:16 +1100 | [diff] [blame] | 1131 | if (!ret) |
| 1132 | ret = tce_iommu_create_window(container, |
| 1133 | create.page_shift, |
| 1134 | create.window_size, create.levels, |
| 1135 | &create.start_addr); |
Alexey Kardashevskiy | e633bc8 | 2015-06-05 16:35:26 +1000 | [diff] [blame] | 1136 | |
| 1137 | mutex_unlock(&container->lock); |
| 1138 | |
| 1139 | if (!ret && copy_to_user((void __user *)arg, &create, minsz)) |
| 1140 | ret = -EFAULT; |
| 1141 | |
| 1142 | return ret; |
| 1143 | } |
| 1144 | case VFIO_IOMMU_SPAPR_TCE_REMOVE: { |
| 1145 | struct vfio_iommu_spapr_tce_remove remove; |
| 1146 | |
| 1147 | if (!container->v2) |
| 1148 | break; |
| 1149 | |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 1150 | ret = tce_iommu_mm_set(container); |
| 1151 | if (ret) |
| 1152 | return ret; |
| 1153 | |
Alexey Kardashevskiy | e633bc8 | 2015-06-05 16:35:26 +1000 | [diff] [blame] | 1154 | if (!tce_groups_attached(container)) |
| 1155 | return -ENXIO; |
| 1156 | |
| 1157 | minsz = offsetofend(struct vfio_iommu_spapr_tce_remove, |
| 1158 | start_addr); |
| 1159 | |
| 1160 | if (copy_from_user(&remove, (void __user *)arg, minsz)) |
| 1161 | return -EFAULT; |
| 1162 | |
| 1163 | if (remove.argsz < minsz) |
| 1164 | return -EINVAL; |
| 1165 | |
| 1166 | if (remove.flags) |
| 1167 | return -EINVAL; |
| 1168 | |
Alexey Kardashevskiy | 53e1896 | 2017-03-17 00:48:29 +0000 | [diff] [blame] | 1169 | if (container->def_window_pending && !remove.start_addr) { |
| 1170 | container->def_window_pending = false; |
| 1171 | return 0; |
| 1172 | } |
| 1173 | |
Alexey Kardashevskiy | e633bc8 | 2015-06-05 16:35:26 +1000 | [diff] [blame] | 1174 | mutex_lock(&container->lock); |
| 1175 | |
| 1176 | ret = tce_iommu_remove_window(container, remove.start_addr); |
| 1177 | |
| 1178 | mutex_unlock(&container->lock); |
| 1179 | |
| 1180 | return ret; |
| 1181 | } |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 1182 | } |
| 1183 | |
| 1184 | return -ENOTTY; |
| 1185 | } |
| 1186 | |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 1187 | static void tce_iommu_release_ownership(struct tce_container *container, |
| 1188 | struct iommu_table_group *table_group) |
| 1189 | { |
| 1190 | int i; |
| 1191 | |
| 1192 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1193 | struct iommu_table *tbl = container->tables[i]; |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 1194 | |
| 1195 | if (!tbl) |
| 1196 | continue; |
| 1197 | |
| 1198 | tce_iommu_clear(container, tbl, tbl->it_offset, tbl->it_size); |
Alexey Kardashevskiy | 92e44bc | 2017-03-17 00:48:27 +0000 | [diff] [blame] | 1199 | tce_iommu_userspace_view_free(tbl, container->mm); |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 1200 | if (tbl->it_map) |
| 1201 | iommu_release_ownership(tbl); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1202 | |
| 1203 | container->tables[i] = NULL; |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 1204 | } |
| 1205 | } |
| 1206 | |
| 1207 | static int tce_iommu_take_ownership(struct tce_container *container, |
| 1208 | struct iommu_table_group *table_group) |
| 1209 | { |
| 1210 | int i, j, rc = 0; |
| 1211 | |
| 1212 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { |
| 1213 | struct iommu_table *tbl = table_group->tables[i]; |
| 1214 | |
| 1215 | if (!tbl || !tbl->it_map) |
| 1216 | continue; |
| 1217 | |
Alexey Kardashevskiy | 5d8b3e7 | 2017-03-17 00:48:26 +0000 | [diff] [blame] | 1218 | rc = iommu_take_ownership(tbl); |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 1219 | if (rc) { |
| 1220 | for (j = 0; j < i; ++j) |
| 1221 | iommu_release_ownership( |
| 1222 | table_group->tables[j]); |
| 1223 | |
| 1224 | return rc; |
| 1225 | } |
| 1226 | } |
| 1227 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1228 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) |
| 1229 | container->tables[i] = table_group->tables[i]; |
| 1230 | |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 1231 | return 0; |
| 1232 | } |
| 1233 | |
| 1234 | static void tce_iommu_release_ownership_ddw(struct tce_container *container, |
| 1235 | struct iommu_table_group *table_group) |
| 1236 | { |
Alexey Kardashevskiy | 46d3e1e | 2015-06-05 16:35:23 +1000 | [diff] [blame] | 1237 | long i; |
| 1238 | |
| 1239 | if (!table_group->ops->unset_window) { |
| 1240 | WARN_ON_ONCE(1); |
| 1241 | return; |
| 1242 | } |
| 1243 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1244 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) |
Alexey Kardashevskiy | 46d3e1e | 2015-06-05 16:35:23 +1000 | [diff] [blame] | 1245 | table_group->ops->unset_window(table_group, i); |
Alexey Kardashevskiy | 46d3e1e | 2015-06-05 16:35:23 +1000 | [diff] [blame] | 1246 | |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 1247 | table_group->ops->release_ownership(table_group); |
| 1248 | } |
| 1249 | |
| 1250 | static long tce_iommu_take_ownership_ddw(struct tce_container *container, |
| 1251 | struct iommu_table_group *table_group) |
| 1252 | { |
Alexey Kardashevskiy | d536202 | 2017-05-23 21:53:51 -0400 | [diff] [blame] | 1253 | long i, ret = 0; |
| 1254 | |
Alexey Kardashevskiy | 46d3e1e | 2015-06-05 16:35:23 +1000 | [diff] [blame] | 1255 | if (!table_group->ops->create_table || !table_group->ops->set_window || |
| 1256 | !table_group->ops->release_ownership) { |
| 1257 | WARN_ON_ONCE(1); |
| 1258 | return -EFAULT; |
| 1259 | } |
| 1260 | |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 1261 | table_group->ops->take_ownership(table_group); |
| 1262 | |
Alexey Kardashevskiy | d536202 | 2017-05-23 21:53:51 -0400 | [diff] [blame] | 1263 | /* Set all windows to the new group */ |
| 1264 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) { |
| 1265 | struct iommu_table *tbl = container->tables[i]; |
| 1266 | |
| 1267 | if (!tbl) |
| 1268 | continue; |
| 1269 | |
| 1270 | ret = table_group->ops->set_window(table_group, i, tbl); |
| 1271 | if (ret) |
| 1272 | goto release_exit; |
| 1273 | } |
| 1274 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1275 | return 0; |
Alexey Kardashevskiy | d536202 | 2017-05-23 21:53:51 -0400 | [diff] [blame] | 1276 | |
| 1277 | release_exit: |
| 1278 | for (i = 0; i < IOMMU_TABLE_GROUP_MAX_TABLES; ++i) |
| 1279 | table_group->ops->unset_window(table_group, i); |
| 1280 | |
| 1281 | table_group->ops->release_ownership(table_group); |
| 1282 | |
| 1283 | return ret; |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 1284 | } |
| 1285 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 1286 | static int tce_iommu_attach_group(void *iommu_data, |
| 1287 | struct iommu_group *iommu_group) |
| 1288 | { |
| 1289 | int ret; |
| 1290 | struct tce_container *container = iommu_data; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 1291 | struct iommu_table_group *table_group; |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1292 | struct tce_iommu_group *tcegrp = NULL; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 1293 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 1294 | mutex_lock(&container->lock); |
| 1295 | |
| 1296 | /* pr_debug("tce_vfio: Attaching group #%u to iommu %p\n", |
| 1297 | iommu_group_id(iommu_group), iommu_group); */ |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 1298 | table_group = iommu_group_get_iommudata(iommu_group); |
Greg Kurz | ff3b1dd | 2017-01-24 17:50:26 +0100 | [diff] [blame] | 1299 | if (!table_group) { |
| 1300 | ret = -ENODEV; |
| 1301 | goto unlock_exit; |
| 1302 | } |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1303 | |
| 1304 | if (tce_groups_attached(container) && (!table_group->ops || |
| 1305 | !table_group->ops->take_ownership || |
| 1306 | !table_group->ops->release_ownership)) { |
| 1307 | ret = -EBUSY; |
| 1308 | goto unlock_exit; |
| 1309 | } |
| 1310 | |
| 1311 | /* Check if new group has the same iommu_ops (i.e. compatible) */ |
| 1312 | list_for_each_entry(tcegrp, &container->group_list, next) { |
| 1313 | struct iommu_table_group *table_group_tmp; |
| 1314 | |
| 1315 | if (tcegrp->grp == iommu_group) { |
| 1316 | pr_warn("tce_vfio: Group %d is already attached\n", |
| 1317 | iommu_group_id(iommu_group)); |
| 1318 | ret = -EBUSY; |
| 1319 | goto unlock_exit; |
| 1320 | } |
| 1321 | table_group_tmp = iommu_group_get_iommudata(tcegrp->grp); |
Alexey Kardashevskiy | 54de285 | 2016-04-29 18:55:15 +1000 | [diff] [blame] | 1322 | if (table_group_tmp->ops->create_table != |
| 1323 | table_group->ops->create_table) { |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1324 | pr_warn("tce_vfio: Group %d is incompatible with group %d\n", |
| 1325 | iommu_group_id(iommu_group), |
| 1326 | iommu_group_id(tcegrp->grp)); |
| 1327 | ret = -EPERM; |
| 1328 | goto unlock_exit; |
| 1329 | } |
| 1330 | } |
| 1331 | |
| 1332 | tcegrp = kzalloc(sizeof(*tcegrp), GFP_KERNEL); |
| 1333 | if (!tcegrp) { |
| 1334 | ret = -ENOMEM; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 1335 | goto unlock_exit; |
| 1336 | } |
| 1337 | |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 1338 | if (!table_group->ops || !table_group->ops->take_ownership || |
Alexey Kardashevskiy | 2e60bac | 2017-03-17 00:48:28 +0000 | [diff] [blame] | 1339 | !table_group->ops->release_ownership) { |
Alexey Kardashevskiy | 5d7601d | 2017-03-24 17:44:06 +1100 | [diff] [blame] | 1340 | if (container->v2) { |
| 1341 | ret = -EPERM; |
| 1342 | goto unlock_exit; |
| 1343 | } |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 1344 | ret = tce_iommu_take_ownership(container, table_group); |
Alexey Kardashevskiy | 2e60bac | 2017-03-17 00:48:28 +0000 | [diff] [blame] | 1345 | } else { |
Alexey Kardashevskiy | 5d7601d | 2017-03-24 17:44:06 +1100 | [diff] [blame] | 1346 | if (!container->v2) { |
| 1347 | ret = -EPERM; |
| 1348 | goto unlock_exit; |
| 1349 | } |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 1350 | ret = tce_iommu_take_ownership_ddw(container, table_group); |
Alexey Kardashevskiy | 2e60bac | 2017-03-17 00:48:28 +0000 | [diff] [blame] | 1351 | if (!tce_groups_attached(container) && !container->tables[0]) |
Alexey Kardashevskiy | 53e1896 | 2017-03-17 00:48:29 +0000 | [diff] [blame] | 1352 | container->def_window_pending = true; |
Alexey Kardashevskiy | 2e60bac | 2017-03-17 00:48:28 +0000 | [diff] [blame] | 1353 | } |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 1354 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1355 | if (!ret) { |
| 1356 | tcegrp->grp = iommu_group; |
| 1357 | list_add(&tcegrp->next, &container->group_list); |
| 1358 | } |
Alexey Kardashevskiy | 22af485 | 2015-06-05 16:35:04 +1000 | [diff] [blame] | 1359 | |
| 1360 | unlock_exit: |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1361 | if (ret && tcegrp) |
| 1362 | kfree(tcegrp); |
| 1363 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 1364 | mutex_unlock(&container->lock); |
| 1365 | |
| 1366 | return ret; |
| 1367 | } |
| 1368 | |
| 1369 | static void tce_iommu_detach_group(void *iommu_data, |
| 1370 | struct iommu_group *iommu_group) |
| 1371 | { |
| 1372 | struct tce_container *container = iommu_data; |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 1373 | struct iommu_table_group *table_group; |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1374 | bool found = false; |
| 1375 | struct tce_iommu_group *tcegrp; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 1376 | |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 1377 | mutex_lock(&container->lock); |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1378 | |
| 1379 | list_for_each_entry(tcegrp, &container->group_list, next) { |
| 1380 | if (tcegrp->grp == iommu_group) { |
| 1381 | found = true; |
| 1382 | break; |
| 1383 | } |
| 1384 | } |
| 1385 | |
| 1386 | if (!found) { |
| 1387 | pr_warn("tce_vfio: detaching unattached group #%u\n", |
| 1388 | iommu_group_id(iommu_group)); |
Alexey Kardashevskiy | 22af485 | 2015-06-05 16:35:04 +1000 | [diff] [blame] | 1389 | goto unlock_exit; |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 1390 | } |
Alexey Kardashevskiy | 22af485 | 2015-06-05 16:35:04 +1000 | [diff] [blame] | 1391 | |
Alexey Kardashevskiy | 2157e7b | 2015-06-05 16:35:25 +1000 | [diff] [blame] | 1392 | list_del(&tcegrp->next); |
| 1393 | kfree(tcegrp); |
Alexey Kardashevskiy | 0eaf4de | 2015-06-05 16:35:09 +1000 | [diff] [blame] | 1394 | |
| 1395 | table_group = iommu_group_get_iommudata(iommu_group); |
| 1396 | BUG_ON(!table_group); |
| 1397 | |
Alexey Kardashevskiy | f87a886 | 2015-06-05 16:35:10 +1000 | [diff] [blame] | 1398 | if (!table_group->ops || !table_group->ops->release_ownership) |
| 1399 | tce_iommu_release_ownership(container, table_group); |
| 1400 | else |
| 1401 | tce_iommu_release_ownership_ddw(container, table_group); |
Alexey Kardashevskiy | 22af485 | 2015-06-05 16:35:04 +1000 | [diff] [blame] | 1402 | |
| 1403 | unlock_exit: |
Alexey Kardashevskiy | 5ffd229 | 2013-05-21 13:33:10 +1000 | [diff] [blame] | 1404 | mutex_unlock(&container->lock); |
| 1405 | } |
| 1406 | |
| 1407 | const struct vfio_iommu_driver_ops tce_iommu_driver_ops = { |
| 1408 | .name = "iommu-vfio-powerpc", |
| 1409 | .owner = THIS_MODULE, |
| 1410 | .open = tce_iommu_open, |
| 1411 | .release = tce_iommu_release, |
| 1412 | .ioctl = tce_iommu_ioctl, |
| 1413 | .attach_group = tce_iommu_attach_group, |
| 1414 | .detach_group = tce_iommu_detach_group, |
| 1415 | }; |
| 1416 | |
| 1417 | static int __init tce_iommu_init(void) |
| 1418 | { |
| 1419 | return vfio_register_iommu_driver(&tce_iommu_driver_ops); |
| 1420 | } |
| 1421 | |
| 1422 | static void __exit tce_iommu_cleanup(void) |
| 1423 | { |
| 1424 | vfio_unregister_iommu_driver(&tce_iommu_driver_ops); |
| 1425 | } |
| 1426 | |
| 1427 | module_init(tce_iommu_init); |
| 1428 | module_exit(tce_iommu_cleanup); |
| 1429 | |
| 1430 | MODULE_VERSION(DRIVER_VERSION); |
| 1431 | MODULE_LICENSE("GPL v2"); |
| 1432 | MODULE_AUTHOR(DRIVER_AUTHOR); |
| 1433 | MODULE_DESCRIPTION(DRIVER_DESC); |
| 1434 | |