Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 1 | /* |
| 2 | * IOMMU for IPMMU/IPMMUI |
| 3 | * Copyright (C) 2012 Hideki EIRAKU |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; version 2 of the License. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/dma-mapping.h> |
| 11 | #include <linux/io.h> |
| 12 | #include <linux/iommu.h> |
| 13 | #include <linux/platform_device.h> |
| 14 | #include <linux/sizes.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <asm/dma-iommu.h> |
| 17 | #include "shmobile-ipmmu.h" |
| 18 | |
| 19 | #define L1_SIZE CONFIG_SHMOBILE_IOMMU_L1SIZE |
| 20 | #define L1_LEN (L1_SIZE / 4) |
| 21 | #define L1_ALIGN L1_SIZE |
| 22 | #define L2_SIZE SZ_1K |
| 23 | #define L2_LEN (L2_SIZE / 4) |
| 24 | #define L2_ALIGN L2_SIZE |
| 25 | |
| 26 | struct shmobile_iommu_domain_pgtable { |
| 27 | uint32_t *pgtable; |
| 28 | dma_addr_t handle; |
| 29 | }; |
| 30 | |
| 31 | struct shmobile_iommu_archdata { |
| 32 | struct list_head attached_list; |
| 33 | struct dma_iommu_mapping *iommu_mapping; |
| 34 | spinlock_t attach_lock; |
| 35 | struct shmobile_iommu_domain *attached; |
| 36 | int num_attached_devices; |
| 37 | struct shmobile_ipmmu *ipmmu; |
| 38 | }; |
| 39 | |
| 40 | struct shmobile_iommu_domain { |
| 41 | struct shmobile_iommu_domain_pgtable l1, l2[L1_LEN]; |
| 42 | spinlock_t map_lock; |
| 43 | spinlock_t attached_list_lock; |
| 44 | struct list_head attached_list; |
Joerg Roedel | dc8fb22 | 2015-03-26 13:43:15 +0100 | [diff] [blame] | 45 | struct iommu_domain domain; |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 46 | }; |
| 47 | |
| 48 | static struct shmobile_iommu_archdata *ipmmu_archdata; |
| 49 | static struct kmem_cache *l1cache, *l2cache; |
| 50 | |
Joerg Roedel | dc8fb22 | 2015-03-26 13:43:15 +0100 | [diff] [blame] | 51 | static struct shmobile_iommu_domain *to_sh_domain(struct iommu_domain *dom) |
| 52 | { |
| 53 | return container_of(dom, struct shmobile_iommu_domain, domain); |
| 54 | } |
| 55 | |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 56 | static int pgtable_alloc(struct shmobile_iommu_domain_pgtable *pgtable, |
| 57 | struct kmem_cache *cache, size_t size) |
| 58 | { |
| 59 | pgtable->pgtable = kmem_cache_zalloc(cache, GFP_ATOMIC); |
| 60 | if (!pgtable->pgtable) |
| 61 | return -ENOMEM; |
| 62 | pgtable->handle = dma_map_single(NULL, pgtable->pgtable, size, |
| 63 | DMA_TO_DEVICE); |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | static void pgtable_free(struct shmobile_iommu_domain_pgtable *pgtable, |
| 68 | struct kmem_cache *cache, size_t size) |
| 69 | { |
| 70 | dma_unmap_single(NULL, pgtable->handle, size, DMA_TO_DEVICE); |
| 71 | kmem_cache_free(cache, pgtable->pgtable); |
| 72 | } |
| 73 | |
| 74 | static uint32_t pgtable_read(struct shmobile_iommu_domain_pgtable *pgtable, |
| 75 | unsigned int index) |
| 76 | { |
| 77 | return pgtable->pgtable[index]; |
| 78 | } |
| 79 | |
| 80 | static void pgtable_write(struct shmobile_iommu_domain_pgtable *pgtable, |
| 81 | unsigned int index, unsigned int count, uint32_t val) |
| 82 | { |
| 83 | unsigned int i; |
| 84 | |
| 85 | for (i = 0; i < count; i++) |
| 86 | pgtable->pgtable[index + i] = val; |
| 87 | dma_sync_single_for_device(NULL, pgtable->handle + index * sizeof(val), |
| 88 | sizeof(val) * count, DMA_TO_DEVICE); |
| 89 | } |
| 90 | |
Joerg Roedel | dc8fb22 | 2015-03-26 13:43:15 +0100 | [diff] [blame] | 91 | static struct iommu_domain *shmobile_iommu_domain_alloc(unsigned type) |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 92 | { |
| 93 | struct shmobile_iommu_domain *sh_domain; |
| 94 | int i, ret; |
| 95 | |
Joerg Roedel | dc8fb22 | 2015-03-26 13:43:15 +0100 | [diff] [blame] | 96 | if (type != IOMMU_DOMAIN_UNMANAGED) |
| 97 | return NULL; |
| 98 | |
| 99 | sh_domain = kzalloc(sizeof(*sh_domain), GFP_KERNEL); |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 100 | if (!sh_domain) |
Joerg Roedel | dc8fb22 | 2015-03-26 13:43:15 +0100 | [diff] [blame] | 101 | return NULL; |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 102 | ret = pgtable_alloc(&sh_domain->l1, l1cache, L1_SIZE); |
| 103 | if (ret < 0) { |
| 104 | kfree(sh_domain); |
Joerg Roedel | dc8fb22 | 2015-03-26 13:43:15 +0100 | [diff] [blame] | 105 | return NULL; |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 106 | } |
| 107 | for (i = 0; i < L1_LEN; i++) |
| 108 | sh_domain->l2[i].pgtable = NULL; |
| 109 | spin_lock_init(&sh_domain->map_lock); |
| 110 | spin_lock_init(&sh_domain->attached_list_lock); |
| 111 | INIT_LIST_HEAD(&sh_domain->attached_list); |
Joerg Roedel | dc8fb22 | 2015-03-26 13:43:15 +0100 | [diff] [blame] | 112 | return &sh_domain->domain; |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 113 | } |
| 114 | |
Joerg Roedel | dc8fb22 | 2015-03-26 13:43:15 +0100 | [diff] [blame] | 115 | static void shmobile_iommu_domain_free(struct iommu_domain *domain) |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 116 | { |
Joerg Roedel | dc8fb22 | 2015-03-26 13:43:15 +0100 | [diff] [blame] | 117 | struct shmobile_iommu_domain *sh_domain = to_sh_domain(domain); |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 118 | int i; |
| 119 | |
| 120 | for (i = 0; i < L1_LEN; i++) { |
| 121 | if (sh_domain->l2[i].pgtable) |
| 122 | pgtable_free(&sh_domain->l2[i], l2cache, L2_SIZE); |
| 123 | } |
| 124 | pgtable_free(&sh_domain->l1, l1cache, L1_SIZE); |
| 125 | kfree(sh_domain); |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 126 | } |
| 127 | |
| 128 | static int shmobile_iommu_attach_device(struct iommu_domain *domain, |
| 129 | struct device *dev) |
| 130 | { |
| 131 | struct shmobile_iommu_archdata *archdata = dev->archdata.iommu; |
Joerg Roedel | dc8fb22 | 2015-03-26 13:43:15 +0100 | [diff] [blame] | 132 | struct shmobile_iommu_domain *sh_domain = to_sh_domain(domain); |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 133 | int ret = -EBUSY; |
| 134 | |
| 135 | if (!archdata) |
| 136 | return -ENODEV; |
| 137 | spin_lock(&sh_domain->attached_list_lock); |
| 138 | spin_lock(&archdata->attach_lock); |
| 139 | if (archdata->attached != sh_domain) { |
| 140 | if (archdata->attached) |
| 141 | goto err; |
| 142 | ipmmu_tlb_set(archdata->ipmmu, sh_domain->l1.handle, L1_SIZE, |
| 143 | 0); |
| 144 | ipmmu_tlb_flush(archdata->ipmmu); |
| 145 | archdata->attached = sh_domain; |
| 146 | archdata->num_attached_devices = 0; |
| 147 | list_add(&archdata->attached_list, &sh_domain->attached_list); |
| 148 | } |
| 149 | archdata->num_attached_devices++; |
| 150 | ret = 0; |
| 151 | err: |
| 152 | spin_unlock(&archdata->attach_lock); |
| 153 | spin_unlock(&sh_domain->attached_list_lock); |
| 154 | return ret; |
| 155 | } |
| 156 | |
| 157 | static void shmobile_iommu_detach_device(struct iommu_domain *domain, |
| 158 | struct device *dev) |
| 159 | { |
| 160 | struct shmobile_iommu_archdata *archdata = dev->archdata.iommu; |
Joerg Roedel | dc8fb22 | 2015-03-26 13:43:15 +0100 | [diff] [blame] | 161 | struct shmobile_iommu_domain *sh_domain = to_sh_domain(domain); |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 162 | |
| 163 | if (!archdata) |
| 164 | return; |
| 165 | spin_lock(&sh_domain->attached_list_lock); |
| 166 | spin_lock(&archdata->attach_lock); |
| 167 | archdata->num_attached_devices--; |
| 168 | if (!archdata->num_attached_devices) { |
| 169 | ipmmu_tlb_set(archdata->ipmmu, 0, 0, 0); |
| 170 | ipmmu_tlb_flush(archdata->ipmmu); |
| 171 | archdata->attached = NULL; |
| 172 | list_del(&archdata->attached_list); |
| 173 | } |
| 174 | spin_unlock(&archdata->attach_lock); |
| 175 | spin_unlock(&sh_domain->attached_list_lock); |
| 176 | } |
| 177 | |
| 178 | static void domain_tlb_flush(struct shmobile_iommu_domain *sh_domain) |
| 179 | { |
| 180 | struct shmobile_iommu_archdata *archdata; |
| 181 | |
| 182 | spin_lock(&sh_domain->attached_list_lock); |
| 183 | list_for_each_entry(archdata, &sh_domain->attached_list, attached_list) |
| 184 | ipmmu_tlb_flush(archdata->ipmmu); |
| 185 | spin_unlock(&sh_domain->attached_list_lock); |
| 186 | } |
| 187 | |
| 188 | static int l2alloc(struct shmobile_iommu_domain *sh_domain, |
| 189 | unsigned int l1index) |
| 190 | { |
| 191 | int ret; |
| 192 | |
| 193 | if (!sh_domain->l2[l1index].pgtable) { |
| 194 | ret = pgtable_alloc(&sh_domain->l2[l1index], l2cache, L2_SIZE); |
| 195 | if (ret < 0) |
| 196 | return ret; |
| 197 | } |
| 198 | pgtable_write(&sh_domain->l1, l1index, 1, |
| 199 | sh_domain->l2[l1index].handle | 0x1); |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | static void l2realfree(struct shmobile_iommu_domain_pgtable *l2) |
| 204 | { |
| 205 | if (l2->pgtable) |
| 206 | pgtable_free(l2, l2cache, L2_SIZE); |
| 207 | } |
| 208 | |
| 209 | static void l2free(struct shmobile_iommu_domain *sh_domain, |
| 210 | unsigned int l1index, |
| 211 | struct shmobile_iommu_domain_pgtable *l2) |
| 212 | { |
| 213 | pgtable_write(&sh_domain->l1, l1index, 1, 0); |
| 214 | if (sh_domain->l2[l1index].pgtable) { |
| 215 | *l2 = sh_domain->l2[l1index]; |
| 216 | sh_domain->l2[l1index].pgtable = NULL; |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | static int shmobile_iommu_map(struct iommu_domain *domain, unsigned long iova, |
| 221 | phys_addr_t paddr, size_t size, int prot) |
| 222 | { |
| 223 | struct shmobile_iommu_domain_pgtable l2 = { .pgtable = NULL }; |
Joerg Roedel | dc8fb22 | 2015-03-26 13:43:15 +0100 | [diff] [blame] | 224 | struct shmobile_iommu_domain *sh_domain = to_sh_domain(domain); |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 225 | unsigned int l1index, l2index; |
| 226 | int ret; |
| 227 | |
| 228 | l1index = iova >> 20; |
| 229 | switch (size) { |
| 230 | case SZ_4K: |
| 231 | l2index = (iova >> 12) & 0xff; |
| 232 | spin_lock(&sh_domain->map_lock); |
| 233 | ret = l2alloc(sh_domain, l1index); |
| 234 | if (!ret) |
| 235 | pgtable_write(&sh_domain->l2[l1index], l2index, 1, |
| 236 | paddr | 0xff2); |
| 237 | spin_unlock(&sh_domain->map_lock); |
| 238 | break; |
| 239 | case SZ_64K: |
| 240 | l2index = (iova >> 12) & 0xf0; |
| 241 | spin_lock(&sh_domain->map_lock); |
| 242 | ret = l2alloc(sh_domain, l1index); |
| 243 | if (!ret) |
| 244 | pgtable_write(&sh_domain->l2[l1index], l2index, 0x10, |
| 245 | paddr | 0xff1); |
| 246 | spin_unlock(&sh_domain->map_lock); |
| 247 | break; |
| 248 | case SZ_1M: |
| 249 | spin_lock(&sh_domain->map_lock); |
| 250 | l2free(sh_domain, l1index, &l2); |
| 251 | pgtable_write(&sh_domain->l1, l1index, 1, paddr | 0xc02); |
| 252 | spin_unlock(&sh_domain->map_lock); |
| 253 | ret = 0; |
| 254 | break; |
| 255 | default: |
| 256 | ret = -EINVAL; |
| 257 | } |
| 258 | if (!ret) |
| 259 | domain_tlb_flush(sh_domain); |
| 260 | l2realfree(&l2); |
| 261 | return ret; |
| 262 | } |
| 263 | |
| 264 | static size_t shmobile_iommu_unmap(struct iommu_domain *domain, |
| 265 | unsigned long iova, size_t size) |
| 266 | { |
| 267 | struct shmobile_iommu_domain_pgtable l2 = { .pgtable = NULL }; |
Joerg Roedel | dc8fb22 | 2015-03-26 13:43:15 +0100 | [diff] [blame] | 268 | struct shmobile_iommu_domain *sh_domain = to_sh_domain(domain); |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 269 | unsigned int l1index, l2index; |
| 270 | uint32_t l2entry = 0; |
| 271 | size_t ret = 0; |
| 272 | |
| 273 | l1index = iova >> 20; |
| 274 | if (!(iova & 0xfffff) && size >= SZ_1M) { |
| 275 | spin_lock(&sh_domain->map_lock); |
| 276 | l2free(sh_domain, l1index, &l2); |
| 277 | spin_unlock(&sh_domain->map_lock); |
| 278 | ret = SZ_1M; |
| 279 | goto done; |
| 280 | } |
| 281 | l2index = (iova >> 12) & 0xff; |
| 282 | spin_lock(&sh_domain->map_lock); |
| 283 | if (sh_domain->l2[l1index].pgtable) |
| 284 | l2entry = pgtable_read(&sh_domain->l2[l1index], l2index); |
| 285 | switch (l2entry & 3) { |
| 286 | case 1: |
| 287 | if (l2index & 0xf) |
| 288 | break; |
| 289 | pgtable_write(&sh_domain->l2[l1index], l2index, 0x10, 0); |
| 290 | ret = SZ_64K; |
| 291 | break; |
| 292 | case 2: |
| 293 | pgtable_write(&sh_domain->l2[l1index], l2index, 1, 0); |
| 294 | ret = SZ_4K; |
| 295 | break; |
| 296 | } |
| 297 | spin_unlock(&sh_domain->map_lock); |
| 298 | done: |
| 299 | if (ret) |
| 300 | domain_tlb_flush(sh_domain); |
| 301 | l2realfree(&l2); |
| 302 | return ret; |
| 303 | } |
| 304 | |
| 305 | static phys_addr_t shmobile_iommu_iova_to_phys(struct iommu_domain *domain, |
Varun Sethi | bb5547ac | 2013-03-29 01:23:58 +0530 | [diff] [blame] | 306 | dma_addr_t iova) |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 307 | { |
Joerg Roedel | dc8fb22 | 2015-03-26 13:43:15 +0100 | [diff] [blame] | 308 | struct shmobile_iommu_domain *sh_domain = to_sh_domain(domain); |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 309 | uint32_t l1entry = 0, l2entry = 0; |
| 310 | unsigned int l1index, l2index; |
| 311 | |
| 312 | l1index = iova >> 20; |
| 313 | l2index = (iova >> 12) & 0xff; |
| 314 | spin_lock(&sh_domain->map_lock); |
| 315 | if (sh_domain->l2[l1index].pgtable) |
| 316 | l2entry = pgtable_read(&sh_domain->l2[l1index], l2index); |
| 317 | else |
| 318 | l1entry = pgtable_read(&sh_domain->l1, l1index); |
| 319 | spin_unlock(&sh_domain->map_lock); |
| 320 | switch (l2entry & 3) { |
| 321 | case 1: |
| 322 | return (l2entry & ~0xffff) | (iova & 0xffff); |
| 323 | case 2: |
| 324 | return (l2entry & ~0xfff) | (iova & 0xfff); |
| 325 | default: |
| 326 | if ((l1entry & 3) == 2) |
| 327 | return (l1entry & ~0xfffff) | (iova & 0xfffff); |
| 328 | return 0; |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | static int find_dev_name(struct shmobile_ipmmu *ipmmu, const char *dev_name) |
| 333 | { |
| 334 | unsigned int i, n = ipmmu->num_dev_names; |
| 335 | |
| 336 | for (i = 0; i < n; i++) { |
| 337 | if (strcmp(ipmmu->dev_names[i], dev_name) == 0) |
| 338 | return 1; |
| 339 | } |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | static int shmobile_iommu_add_device(struct device *dev) |
| 344 | { |
| 345 | struct shmobile_iommu_archdata *archdata = ipmmu_archdata; |
| 346 | struct dma_iommu_mapping *mapping; |
| 347 | |
| 348 | if (!find_dev_name(archdata->ipmmu, dev_name(dev))) |
| 349 | return 0; |
| 350 | mapping = archdata->iommu_mapping; |
| 351 | if (!mapping) { |
| 352 | mapping = arm_iommu_create_mapping(&platform_bus_type, 0, |
Marek Szyprowski | 68efd7d | 2014-02-25 13:01:09 +0100 | [diff] [blame] | 353 | L1_LEN << 20); |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 354 | if (IS_ERR(mapping)) |
| 355 | return PTR_ERR(mapping); |
| 356 | archdata->iommu_mapping = mapping; |
| 357 | } |
| 358 | dev->archdata.iommu = archdata; |
| 359 | if (arm_iommu_attach_device(dev, mapping)) |
| 360 | pr_err("arm_iommu_attach_device failed\n"); |
| 361 | return 0; |
| 362 | } |
| 363 | |
Thierry Reding | b22f643 | 2014-06-27 09:03:12 +0200 | [diff] [blame] | 364 | static const struct iommu_ops shmobile_iommu_ops = { |
Joerg Roedel | dc8fb22 | 2015-03-26 13:43:15 +0100 | [diff] [blame] | 365 | .domain_alloc = shmobile_iommu_domain_alloc, |
| 366 | .domain_free = shmobile_iommu_domain_free, |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 367 | .attach_dev = shmobile_iommu_attach_device, |
| 368 | .detach_dev = shmobile_iommu_detach_device, |
| 369 | .map = shmobile_iommu_map, |
| 370 | .unmap = shmobile_iommu_unmap, |
Olav Haugan | 315786e | 2014-10-25 09:55:16 -0700 | [diff] [blame] | 371 | .map_sg = default_iommu_map_sg, |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 372 | .iova_to_phys = shmobile_iommu_iova_to_phys, |
| 373 | .add_device = shmobile_iommu_add_device, |
| 374 | .pgsize_bitmap = SZ_1M | SZ_64K | SZ_4K, |
| 375 | }; |
| 376 | |
| 377 | int ipmmu_iommu_init(struct shmobile_ipmmu *ipmmu) |
| 378 | { |
| 379 | static struct shmobile_iommu_archdata *archdata; |
| 380 | |
| 381 | l1cache = kmem_cache_create("shmobile-iommu-pgtable1", L1_SIZE, |
| 382 | L1_ALIGN, SLAB_HWCACHE_ALIGN, NULL); |
| 383 | if (!l1cache) |
| 384 | return -ENOMEM; |
| 385 | l2cache = kmem_cache_create("shmobile-iommu-pgtable2", L2_SIZE, |
| 386 | L2_ALIGN, SLAB_HWCACHE_ALIGN, NULL); |
| 387 | if (!l2cache) { |
| 388 | kmem_cache_destroy(l1cache); |
| 389 | return -ENOMEM; |
| 390 | } |
Laurent Pinchart | dc89f79 | 2013-12-17 18:18:49 +0100 | [diff] [blame] | 391 | archdata = kzalloc(sizeof(*archdata), GFP_KERNEL); |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 392 | if (!archdata) { |
| 393 | kmem_cache_destroy(l1cache); |
| 394 | kmem_cache_destroy(l2cache); |
| 395 | return -ENOMEM; |
| 396 | } |
| 397 | spin_lock_init(&archdata->attach_lock); |
Hideki EIRAKU | c2c460f | 2013-01-21 19:54:26 +0900 | [diff] [blame] | 398 | archdata->ipmmu = ipmmu; |
| 399 | ipmmu_archdata = archdata; |
| 400 | bus_set_iommu(&platform_bus_type, &shmobile_iommu_ops); |
| 401 | return 0; |
| 402 | } |