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