1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2015-2016, Linaro Limited 4 */ 5 #include <linux/device.h> 6 #include <linux/dma-buf.h> 7 #include <linux/fdtable.h> 8 #include <linux/idr.h> 9 #include <linux/sched.h> 10 #include <linux/slab.h> 11 #include <linux/tee_drv.h> 12 #include <linux/uio.h> 13 #include "tee_private.h" 14 15 static void release_registered_pages(struct tee_shm *shm) 16 { 17 if (shm->pages) { 18 if (shm->flags & TEE_SHM_USER_MAPPED) { 19 unpin_user_pages(shm->pages, shm->num_pages); 20 } else { 21 size_t n; 22 23 for (n = 0; n < shm->num_pages; n++) 24 put_page(shm->pages[n]); 25 } 26 27 kfree(shm->pages); 28 } 29 } 30 31 static void tee_shm_release(struct tee_shm *shm) 32 { 33 struct tee_device *teedev = shm->ctx->teedev; 34 35 if (shm->flags & TEE_SHM_DMA_BUF) { 36 mutex_lock(&teedev->mutex); 37 idr_remove(&teedev->idr, shm->id); 38 mutex_unlock(&teedev->mutex); 39 } 40 41 if (shm->flags & TEE_SHM_POOL) { 42 struct tee_shm_pool_mgr *poolm; 43 44 if (shm->flags & TEE_SHM_DMA_BUF) 45 poolm = teedev->pool->dma_buf_mgr; 46 else 47 poolm = teedev->pool->private_mgr; 48 49 poolm->ops->free(poolm, shm); 50 } else if (shm->flags & TEE_SHM_REGISTER) { 51 int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm); 52 53 if (rc) 54 dev_err(teedev->dev.parent, 55 "unregister shm %p failed: %d", shm, rc); 56 57 release_registered_pages(shm); 58 } 59 60 teedev_ctx_put(shm->ctx); 61 62 kfree(shm); 63 64 tee_device_put(teedev); 65 } 66 67 static struct sg_table *tee_shm_op_map_dma_buf(struct dma_buf_attachment 68 *attach, enum dma_data_direction dir) 69 { 70 return NULL; 71 } 72 73 static void tee_shm_op_unmap_dma_buf(struct dma_buf_attachment *attach, 74 struct sg_table *table, 75 enum dma_data_direction dir) 76 { 77 } 78 79 static void tee_shm_op_release(struct dma_buf *dmabuf) 80 { 81 struct tee_shm *shm = dmabuf->priv; 82 83 tee_shm_release(shm); 84 } 85 86 static int tee_shm_op_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma) 87 { 88 struct tee_shm *shm = dmabuf->priv; 89 size_t size = vma->vm_end - vma->vm_start; 90 91 /* Refuse sharing shared memory provided by application */ 92 if (shm->flags & TEE_SHM_USER_MAPPED) 93 return -EINVAL; 94 95 return remap_pfn_range(vma, vma->vm_start, shm->paddr >> PAGE_SHIFT, 96 size, vma->vm_page_prot); 97 } 98 99 static const struct dma_buf_ops tee_shm_dma_buf_ops = { 100 .map_dma_buf = tee_shm_op_map_dma_buf, 101 .unmap_dma_buf = tee_shm_op_unmap_dma_buf, 102 .release = tee_shm_op_release, 103 .mmap = tee_shm_op_mmap, 104 }; 105 106 struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags) 107 { 108 struct tee_device *teedev = ctx->teedev; 109 struct tee_shm_pool_mgr *poolm = NULL; 110 struct tee_shm *shm; 111 void *ret; 112 int rc; 113 114 if (!(flags & TEE_SHM_MAPPED)) { 115 dev_err(teedev->dev.parent, 116 "only mapped allocations supported\n"); 117 return ERR_PTR(-EINVAL); 118 } 119 120 if ((flags & ~(TEE_SHM_MAPPED | TEE_SHM_DMA_BUF))) { 121 dev_err(teedev->dev.parent, "invalid shm flags 0x%x", flags); 122 return ERR_PTR(-EINVAL); 123 } 124 125 if (!tee_device_get(teedev)) 126 return ERR_PTR(-EINVAL); 127 128 if (!teedev->pool) { 129 /* teedev has been detached from driver */ 130 ret = ERR_PTR(-EINVAL); 131 goto err_dev_put; 132 } 133 134 shm = kzalloc(sizeof(*shm), GFP_KERNEL); 135 if (!shm) { 136 ret = ERR_PTR(-ENOMEM); 137 goto err_dev_put; 138 } 139 140 shm->flags = flags | TEE_SHM_POOL; 141 shm->ctx = ctx; 142 if (flags & TEE_SHM_DMA_BUF) 143 poolm = teedev->pool->dma_buf_mgr; 144 else 145 poolm = teedev->pool->private_mgr; 146 147 rc = poolm->ops->alloc(poolm, shm, size); 148 if (rc) { 149 ret = ERR_PTR(rc); 150 goto err_kfree; 151 } 152 153 154 if (flags & TEE_SHM_DMA_BUF) { 155 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 156 157 mutex_lock(&teedev->mutex); 158 shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL); 159 mutex_unlock(&teedev->mutex); 160 if (shm->id < 0) { 161 ret = ERR_PTR(shm->id); 162 goto err_pool_free; 163 } 164 165 exp_info.ops = &tee_shm_dma_buf_ops; 166 exp_info.size = shm->size; 167 exp_info.flags = O_RDWR; 168 exp_info.priv = shm; 169 170 shm->dmabuf = dma_buf_export(&exp_info); 171 if (IS_ERR(shm->dmabuf)) { 172 ret = ERR_CAST(shm->dmabuf); 173 goto err_rem; 174 } 175 } 176 177 teedev_ctx_get(ctx); 178 179 return shm; 180 err_rem: 181 if (flags & TEE_SHM_DMA_BUF) { 182 mutex_lock(&teedev->mutex); 183 idr_remove(&teedev->idr, shm->id); 184 mutex_unlock(&teedev->mutex); 185 } 186 err_pool_free: 187 poolm->ops->free(poolm, shm); 188 err_kfree: 189 kfree(shm); 190 err_dev_put: 191 tee_device_put(teedev); 192 return ret; 193 } 194 EXPORT_SYMBOL_GPL(tee_shm_alloc); 195 196 struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr, 197 size_t length, u32 flags) 198 { 199 struct tee_device *teedev = ctx->teedev; 200 const u32 req_user_flags = TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED; 201 const u32 req_kernel_flags = TEE_SHM_DMA_BUF | TEE_SHM_KERNEL_MAPPED; 202 struct tee_shm *shm; 203 void *ret; 204 int rc; 205 int num_pages; 206 unsigned long start; 207 208 if (flags != req_user_flags && flags != req_kernel_flags) 209 return ERR_PTR(-ENOTSUPP); 210 211 if (!tee_device_get(teedev)) 212 return ERR_PTR(-EINVAL); 213 214 if (!teedev->desc->ops->shm_register || 215 !teedev->desc->ops->shm_unregister) { 216 tee_device_put(teedev); 217 return ERR_PTR(-ENOTSUPP); 218 } 219 220 teedev_ctx_get(ctx); 221 222 shm = kzalloc(sizeof(*shm), GFP_KERNEL); 223 if (!shm) { 224 ret = ERR_PTR(-ENOMEM); 225 goto err; 226 } 227 228 shm->flags = flags | TEE_SHM_REGISTER; 229 shm->ctx = ctx; 230 shm->id = -1; 231 addr = untagged_addr(addr); 232 start = rounddown(addr, PAGE_SIZE); 233 shm->offset = addr - start; 234 shm->size = length; 235 num_pages = (roundup(addr + length, PAGE_SIZE) - start) / PAGE_SIZE; 236 shm->pages = kcalloc(num_pages, sizeof(*shm->pages), GFP_KERNEL); 237 if (!shm->pages) { 238 ret = ERR_PTR(-ENOMEM); 239 goto err; 240 } 241 242 if (flags & TEE_SHM_USER_MAPPED) { 243 rc = pin_user_pages_fast(start, num_pages, FOLL_WRITE, 244 shm->pages); 245 } else { 246 struct kvec *kiov; 247 int i; 248 249 kiov = kcalloc(num_pages, sizeof(*kiov), GFP_KERNEL); 250 if (!kiov) { 251 ret = ERR_PTR(-ENOMEM); 252 goto err; 253 } 254 255 for (i = 0; i < num_pages; i++) { 256 kiov[i].iov_base = (void *)(start + i * PAGE_SIZE); 257 kiov[i].iov_len = PAGE_SIZE; 258 } 259 260 rc = get_kernel_pages(kiov, num_pages, 0, shm->pages); 261 kfree(kiov); 262 } 263 if (rc > 0) 264 shm->num_pages = rc; 265 if (rc != num_pages) { 266 if (rc >= 0) 267 rc = -ENOMEM; 268 ret = ERR_PTR(rc); 269 goto err; 270 } 271 272 mutex_lock(&teedev->mutex); 273 shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL); 274 mutex_unlock(&teedev->mutex); 275 276 if (shm->id < 0) { 277 ret = ERR_PTR(shm->id); 278 goto err; 279 } 280 281 rc = teedev->desc->ops->shm_register(ctx, shm, shm->pages, 282 shm->num_pages, start); 283 if (rc) { 284 ret = ERR_PTR(rc); 285 goto err; 286 } 287 288 if (flags & TEE_SHM_DMA_BUF) { 289 DEFINE_DMA_BUF_EXPORT_INFO(exp_info); 290 291 exp_info.ops = &tee_shm_dma_buf_ops; 292 exp_info.size = shm->size; 293 exp_info.flags = O_RDWR; 294 exp_info.priv = shm; 295 296 shm->dmabuf = dma_buf_export(&exp_info); 297 if (IS_ERR(shm->dmabuf)) { 298 ret = ERR_CAST(shm->dmabuf); 299 teedev->desc->ops->shm_unregister(ctx, shm); 300 goto err; 301 } 302 } 303 304 return shm; 305 err: 306 if (shm) { 307 if (shm->id >= 0) { 308 mutex_lock(&teedev->mutex); 309 idr_remove(&teedev->idr, shm->id); 310 mutex_unlock(&teedev->mutex); 311 } 312 release_registered_pages(shm); 313 } 314 kfree(shm); 315 teedev_ctx_put(ctx); 316 tee_device_put(teedev); 317 return ret; 318 } 319 EXPORT_SYMBOL_GPL(tee_shm_register); 320 321 /** 322 * tee_shm_get_fd() - Increase reference count and return file descriptor 323 * @shm: Shared memory handle 324 * @returns user space file descriptor to shared memory 325 */ 326 int tee_shm_get_fd(struct tee_shm *shm) 327 { 328 int fd; 329 330 if (!(shm->flags & TEE_SHM_DMA_BUF)) 331 return -EINVAL; 332 333 get_dma_buf(shm->dmabuf); 334 fd = dma_buf_fd(shm->dmabuf, O_CLOEXEC); 335 if (fd < 0) 336 dma_buf_put(shm->dmabuf); 337 return fd; 338 } 339 340 /** 341 * tee_shm_free() - Free shared memory 342 * @shm: Handle to shared memory to free 343 */ 344 void tee_shm_free(struct tee_shm *shm) 345 { 346 /* 347 * dma_buf_put() decreases the dmabuf reference counter and will 348 * call tee_shm_release() when the last reference is gone. 349 * 350 * In the case of driver private memory we call tee_shm_release 351 * directly instead as it doesn't have a reference counter. 352 */ 353 if (shm->flags & TEE_SHM_DMA_BUF) 354 dma_buf_put(shm->dmabuf); 355 else 356 tee_shm_release(shm); 357 } 358 EXPORT_SYMBOL_GPL(tee_shm_free); 359 360 /** 361 * tee_shm_va2pa() - Get physical address of a virtual address 362 * @shm: Shared memory handle 363 * @va: Virtual address to tranlsate 364 * @pa: Returned physical address 365 * @returns 0 on success and < 0 on failure 366 */ 367 int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa) 368 { 369 if (!(shm->flags & TEE_SHM_MAPPED)) 370 return -EINVAL; 371 /* Check that we're in the range of the shm */ 372 if ((char *)va < (char *)shm->kaddr) 373 return -EINVAL; 374 if ((char *)va >= ((char *)shm->kaddr + shm->size)) 375 return -EINVAL; 376 377 return tee_shm_get_pa( 378 shm, (unsigned long)va - (unsigned long)shm->kaddr, pa); 379 } 380 EXPORT_SYMBOL_GPL(tee_shm_va2pa); 381 382 /** 383 * tee_shm_pa2va() - Get virtual address of a physical address 384 * @shm: Shared memory handle 385 * @pa: Physical address to tranlsate 386 * @va: Returned virtual address 387 * @returns 0 on success and < 0 on failure 388 */ 389 int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va) 390 { 391 if (!(shm->flags & TEE_SHM_MAPPED)) 392 return -EINVAL; 393 /* Check that we're in the range of the shm */ 394 if (pa < shm->paddr) 395 return -EINVAL; 396 if (pa >= (shm->paddr + shm->size)) 397 return -EINVAL; 398 399 if (va) { 400 void *v = tee_shm_get_va(shm, pa - shm->paddr); 401 402 if (IS_ERR(v)) 403 return PTR_ERR(v); 404 *va = v; 405 } 406 return 0; 407 } 408 EXPORT_SYMBOL_GPL(tee_shm_pa2va); 409 410 /** 411 * tee_shm_get_va() - Get virtual address of a shared memory plus an offset 412 * @shm: Shared memory handle 413 * @offs: Offset from start of this shared memory 414 * @returns virtual address of the shared memory + offs if offs is within 415 * the bounds of this shared memory, else an ERR_PTR 416 */ 417 void *tee_shm_get_va(struct tee_shm *shm, size_t offs) 418 { 419 if (!(shm->flags & TEE_SHM_MAPPED)) 420 return ERR_PTR(-EINVAL); 421 if (offs >= shm->size) 422 return ERR_PTR(-EINVAL); 423 return (char *)shm->kaddr + offs; 424 } 425 EXPORT_SYMBOL_GPL(tee_shm_get_va); 426 427 /** 428 * tee_shm_get_pa() - Get physical address of a shared memory plus an offset 429 * @shm: Shared memory handle 430 * @offs: Offset from start of this shared memory 431 * @pa: Physical address to return 432 * @returns 0 if offs is within the bounds of this shared memory, else an 433 * error code. 434 */ 435 int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa) 436 { 437 if (offs >= shm->size) 438 return -EINVAL; 439 if (pa) 440 *pa = shm->paddr + offs; 441 return 0; 442 } 443 EXPORT_SYMBOL_GPL(tee_shm_get_pa); 444 445 /** 446 * tee_shm_get_from_id() - Find shared memory object and increase reference 447 * count 448 * @ctx: Context owning the shared memory 449 * @id: Id of shared memory object 450 * @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure 451 */ 452 struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id) 453 { 454 struct tee_device *teedev; 455 struct tee_shm *shm; 456 457 if (!ctx) 458 return ERR_PTR(-EINVAL); 459 460 teedev = ctx->teedev; 461 mutex_lock(&teedev->mutex); 462 shm = idr_find(&teedev->idr, id); 463 if (!shm || shm->ctx != ctx) 464 shm = ERR_PTR(-EINVAL); 465 else if (shm->flags & TEE_SHM_DMA_BUF) 466 get_dma_buf(shm->dmabuf); 467 mutex_unlock(&teedev->mutex); 468 return shm; 469 } 470 EXPORT_SYMBOL_GPL(tee_shm_get_from_id); 471 472 /** 473 * tee_shm_put() - Decrease reference count on a shared memory handle 474 * @shm: Shared memory handle 475 */ 476 void tee_shm_put(struct tee_shm *shm) 477 { 478 if (shm->flags & TEE_SHM_DMA_BUF) 479 dma_buf_put(shm->dmabuf); 480 } 481 EXPORT_SYMBOL_GPL(tee_shm_put); 482