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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2015-2017, 2019-2021 Linaro Limited
4 */
5#include <linux/anon_inodes.h>
6#include <linux/device.h>
7#include <linux/idr.h>
8#include <linux/mm.h>
9#include <linux/sched.h>
10#include <linux/slab.h>
11#include <linux/tee_drv.h>
12#include <linux/uaccess.h>
13#include <linux/uio.h>
14#include <linux/highmem.h>
15#include "tee_private.h"
16
17static void shm_put_kernel_pages(struct page **pages, size_t page_count)
18{
19 size_t n;
20
21 for (n = 0; n < page_count; n++)
22 put_page(pages[n]);
23}
24
25static void shm_get_kernel_pages(struct page **pages, size_t page_count)
26{
27 size_t n;
28
29 for (n = 0; n < page_count; n++)
30 get_page(pages[n]);
31}
32
33static void release_registered_pages(struct tee_shm *shm)
34{
35 if (shm->pages) {
36 if (shm->flags & TEE_SHM_USER_MAPPED)
37 unpin_user_pages(shm->pages, shm->num_pages);
38 else
39 shm_put_kernel_pages(shm->pages, shm->num_pages);
40
41 kfree(shm->pages);
42 }
43}
44
45static void tee_shm_release(struct tee_device *teedev, struct tee_shm *shm)
46{
47 if (shm->flags & TEE_SHM_POOL) {
48 teedev->pool->ops->free(teedev->pool, shm);
49 } else if (shm->flags & TEE_SHM_DYNAMIC) {
50 int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm);
51
52 if (rc)
53 dev_err(teedev->dev.parent,
54 "unregister shm %p failed: %d", shm, rc);
55
56 release_registered_pages(shm);
57 }
58
59 teedev_ctx_put(shm->ctx);
60
61 kfree(shm);
62
63 tee_device_put(teedev);
64}
65
66static struct tee_shm *shm_alloc_helper(struct tee_context *ctx, size_t size,
67 size_t align, u32 flags, int id)
68{
69 struct tee_device *teedev = ctx->teedev;
70 struct tee_shm *shm;
71 void *ret;
72 int rc;
73
74 if (!tee_device_get(teedev))
75 return ERR_PTR(-EINVAL);
76
77 if (!teedev->pool) {
78 /* teedev has been detached from driver */
79 ret = ERR_PTR(-EINVAL);
80 goto err_dev_put;
81 }
82
83 shm = kzalloc(sizeof(*shm), GFP_KERNEL);
84 if (!shm) {
85 ret = ERR_PTR(-ENOMEM);
86 goto err_dev_put;
87 }
88
89 refcount_set(&shm->refcount, 1);
90 shm->flags = flags;
91 shm->id = id;
92
93 /*
94 * We're assigning this as it is needed if the shm is to be
95 * registered. If this function returns OK then the caller expected
96 * to call teedev_ctx_get() or clear shm->ctx in case it's not
97 * needed any longer.
98 */
99 shm->ctx = ctx;
100
101 rc = teedev->pool->ops->alloc(teedev->pool, shm, size, align);
102 if (rc) {
103 ret = ERR_PTR(rc);
104 goto err_kfree;
105 }
106
107 teedev_ctx_get(ctx);
108 return shm;
109err_kfree:
110 kfree(shm);
111err_dev_put:
112 tee_device_put(teedev);
113 return ret;
114}
115
116/**
117 * tee_shm_alloc_user_buf() - Allocate shared memory for user space
118 * @ctx: Context that allocates the shared memory
119 * @size: Requested size of shared memory
120 *
121 * Memory allocated as user space shared memory is automatically freed when
122 * the TEE file pointer is closed. The primary usage of this function is
123 * when the TEE driver doesn't support registering ordinary user space
124 * memory.
125 *
126 * @returns a pointer to 'struct tee_shm'
127 */
128struct tee_shm *tee_shm_alloc_user_buf(struct tee_context *ctx, size_t size)
129{
130 u32 flags = TEE_SHM_DYNAMIC | TEE_SHM_POOL;
131 struct tee_device *teedev = ctx->teedev;
132 struct tee_shm *shm;
133 void *ret;
134 int id;
135
136 mutex_lock(&teedev->mutex);
137 id = idr_alloc(&teedev->idr, NULL, 1, 0, GFP_KERNEL);
138 mutex_unlock(&teedev->mutex);
139 if (id < 0)
140 return ERR_PTR(id);
141
142 shm = shm_alloc_helper(ctx, size, PAGE_SIZE, flags, id);
143 if (IS_ERR(shm)) {
144 mutex_lock(&teedev->mutex);
145 idr_remove(&teedev->idr, id);
146 mutex_unlock(&teedev->mutex);
147 return shm;
148 }
149
150 mutex_lock(&teedev->mutex);
151 ret = idr_replace(&teedev->idr, shm, id);
152 mutex_unlock(&teedev->mutex);
153 if (IS_ERR(ret)) {
154 tee_shm_free(shm);
155 return ret;
156 }
157
158 return shm;
159}
160
161/**
162 * tee_shm_alloc_kernel_buf() - Allocate shared memory for kernel buffer
163 * @ctx: Context that allocates the shared memory
164 * @size: Requested size of shared memory
165 *
166 * The returned memory registered in secure world and is suitable to be
167 * passed as a memory buffer in parameter argument to
168 * tee_client_invoke_func(). The memory allocated is later freed with a
169 * call to tee_shm_free().
170 *
171 * @returns a pointer to 'struct tee_shm'
172 */
173struct tee_shm *tee_shm_alloc_kernel_buf(struct tee_context *ctx, size_t size)
174{
175 u32 flags = TEE_SHM_DYNAMIC | TEE_SHM_POOL;
176
177 return shm_alloc_helper(ctx, size, PAGE_SIZE, flags, -1);
178}
179EXPORT_SYMBOL_GPL(tee_shm_alloc_kernel_buf);
180
181/**
182 * tee_shm_alloc_priv_buf() - Allocate shared memory for a privately shared
183 * kernel buffer
184 * @ctx: Context that allocates the shared memory
185 * @size: Requested size of shared memory
186 *
187 * This function returns similar shared memory as
188 * tee_shm_alloc_kernel_buf(), but with the difference that the memory
189 * might not be registered in secure world in case the driver supports
190 * passing memory not registered in advance.
191 *
192 * This function should normally only be used internally in the TEE
193 * drivers.
194 *
195 * @returns a pointer to 'struct tee_shm'
196 */
197struct tee_shm *tee_shm_alloc_priv_buf(struct tee_context *ctx, size_t size)
198{
199 u32 flags = TEE_SHM_PRIV | TEE_SHM_POOL;
200
201 return shm_alloc_helper(ctx, size, sizeof(long) * 2, flags, -1);
202}
203EXPORT_SYMBOL_GPL(tee_shm_alloc_priv_buf);
204
205static struct tee_shm *
206register_shm_helper(struct tee_context *ctx, struct iov_iter *iter, u32 flags,
207 int id)
208{
209 struct tee_device *teedev = ctx->teedev;
210 struct tee_shm *shm;
211 unsigned long start, addr;
212 size_t num_pages, off;
213 ssize_t len;
214 void *ret;
215 int rc;
216
217 if (!tee_device_get(teedev))
218 return ERR_PTR(-EINVAL);
219
220 if (!teedev->desc->ops->shm_register ||
221 !teedev->desc->ops->shm_unregister) {
222 ret = ERR_PTR(-ENOTSUPP);
223 goto err_dev_put;
224 }
225
226 teedev_ctx_get(ctx);
227
228 shm = kzalloc(sizeof(*shm), GFP_KERNEL);
229 if (!shm) {
230 ret = ERR_PTR(-ENOMEM);
231 goto err_ctx_put;
232 }
233
234 refcount_set(&shm->refcount, 1);
235 shm->flags = flags;
236 shm->ctx = ctx;
237 shm->id = id;
238 addr = untagged_addr((unsigned long)iter_iov_addr(iter));
239 start = rounddown(addr, PAGE_SIZE);
240 num_pages = iov_iter_npages(iter, INT_MAX);
241 if (!num_pages) {
242 ret = ERR_PTR(-ENOMEM);
243 goto err_ctx_put;
244 }
245
246 shm->pages = kcalloc(num_pages, sizeof(*shm->pages), GFP_KERNEL);
247 if (!shm->pages) {
248 ret = ERR_PTR(-ENOMEM);
249 goto err_free_shm;
250 }
251
252 len = iov_iter_extract_pages(iter, &shm->pages, LONG_MAX, num_pages, 0,
253 &off);
254 if (unlikely(len <= 0)) {
255 ret = len ? ERR_PTR(len) : ERR_PTR(-ENOMEM);
256 goto err_free_shm_pages;
257 }
258
259 /*
260 * iov_iter_extract_kvec_pages does not get reference on the pages,
261 * get a reference on them.
262 */
263 if (iov_iter_is_kvec(iter))
264 shm_get_kernel_pages(shm->pages, num_pages);
265
266 shm->offset = off;
267 shm->size = len;
268 shm->num_pages = num_pages;
269
270 rc = teedev->desc->ops->shm_register(ctx, shm, shm->pages,
271 shm->num_pages, start);
272 if (rc) {
273 ret = ERR_PTR(rc);
274 goto err_put_shm_pages;
275 }
276
277 return shm;
278err_put_shm_pages:
279 if (!iov_iter_is_kvec(iter))
280 unpin_user_pages(shm->pages, shm->num_pages);
281 else
282 shm_put_kernel_pages(shm->pages, shm->num_pages);
283err_free_shm_pages:
284 kfree(shm->pages);
285err_free_shm:
286 kfree(shm);
287err_ctx_put:
288 teedev_ctx_put(ctx);
289err_dev_put:
290 tee_device_put(teedev);
291 return ret;
292}
293
294/**
295 * tee_shm_register_user_buf() - Register a userspace shared memory buffer
296 * @ctx: Context that registers the shared memory
297 * @addr: The userspace address of the shared buffer
298 * @length: Length of the shared buffer
299 *
300 * @returns a pointer to 'struct tee_shm'
301 */
302struct tee_shm *tee_shm_register_user_buf(struct tee_context *ctx,
303 unsigned long addr, size_t length)
304{
305 u32 flags = TEE_SHM_USER_MAPPED | TEE_SHM_DYNAMIC;
306 struct tee_device *teedev = ctx->teedev;
307 struct tee_shm *shm;
308 struct iov_iter iter;
309 void *ret;
310 int id;
311
312 if (!access_ok((void __user *)addr, length))
313 return ERR_PTR(-EFAULT);
314
315 mutex_lock(&teedev->mutex);
316 id = idr_alloc(&teedev->idr, NULL, 1, 0, GFP_KERNEL);
317 mutex_unlock(&teedev->mutex);
318 if (id < 0)
319 return ERR_PTR(id);
320
321 iov_iter_ubuf(&iter, ITER_DEST, (void __user *)addr, length);
322 shm = register_shm_helper(ctx, &iter, flags, id);
323 if (IS_ERR(shm)) {
324 mutex_lock(&teedev->mutex);
325 idr_remove(&teedev->idr, id);
326 mutex_unlock(&teedev->mutex);
327 return shm;
328 }
329
330 mutex_lock(&teedev->mutex);
331 ret = idr_replace(&teedev->idr, shm, id);
332 mutex_unlock(&teedev->mutex);
333 if (IS_ERR(ret)) {
334 tee_shm_free(shm);
335 return ret;
336 }
337
338 return shm;
339}
340
341/**
342 * tee_shm_register_kernel_buf() - Register kernel memory to be shared with
343 * secure world
344 * @ctx: Context that registers the shared memory
345 * @addr: The buffer
346 * @length: Length of the buffer
347 *
348 * @returns a pointer to 'struct tee_shm'
349 */
350
351struct tee_shm *tee_shm_register_kernel_buf(struct tee_context *ctx,
352 void *addr, size_t length)
353{
354 u32 flags = TEE_SHM_DYNAMIC;
355 struct kvec kvec;
356 struct iov_iter iter;
357
358 kvec.iov_base = addr;
359 kvec.iov_len = length;
360 iov_iter_kvec(&iter, ITER_DEST, &kvec, 1, length);
361
362 return register_shm_helper(ctx, &iter, flags, -1);
363}
364EXPORT_SYMBOL_GPL(tee_shm_register_kernel_buf);
365
366static int tee_shm_fop_release(struct inode *inode, struct file *filp)
367{
368 tee_shm_put(filp->private_data);
369 return 0;
370}
371
372static int tee_shm_fop_mmap(struct file *filp, struct vm_area_struct *vma)
373{
374 struct tee_shm *shm = filp->private_data;
375 size_t size = vma->vm_end - vma->vm_start;
376
377 /* Refuse sharing shared memory provided by application */
378 if (shm->flags & TEE_SHM_USER_MAPPED)
379 return -EINVAL;
380
381 /* check for overflowing the buffer's size */
382 if (vma->vm_pgoff + vma_pages(vma) > shm->size >> PAGE_SHIFT)
383 return -EINVAL;
384
385 return remap_pfn_range(vma, vma->vm_start, shm->paddr >> PAGE_SHIFT,
386 size, vma->vm_page_prot);
387}
388
389static const struct file_operations tee_shm_fops = {
390 .owner = THIS_MODULE,
391 .release = tee_shm_fop_release,
392 .mmap = tee_shm_fop_mmap,
393};
394
395/**
396 * tee_shm_get_fd() - Increase reference count and return file descriptor
397 * @shm: Shared memory handle
398 * @returns user space file descriptor to shared memory
399 */
400int tee_shm_get_fd(struct tee_shm *shm)
401{
402 int fd;
403
404 if (shm->id < 0)
405 return -EINVAL;
406
407 /* matched by tee_shm_put() in tee_shm_op_release() */
408 refcount_inc(&shm->refcount);
409 fd = anon_inode_getfd("tee_shm", &tee_shm_fops, shm, O_RDWR);
410 if (fd < 0)
411 tee_shm_put(shm);
412 return fd;
413}
414
415/**
416 * tee_shm_free() - Free shared memory
417 * @shm: Handle to shared memory to free
418 */
419void tee_shm_free(struct tee_shm *shm)
420{
421 tee_shm_put(shm);
422}
423EXPORT_SYMBOL_GPL(tee_shm_free);
424
425/**
426 * tee_shm_get_va() - Get virtual address of a shared memory plus an offset
427 * @shm: Shared memory handle
428 * @offs: Offset from start of this shared memory
429 * @returns virtual address of the shared memory + offs if offs is within
430 * the bounds of this shared memory, else an ERR_PTR
431 */
432void *tee_shm_get_va(struct tee_shm *shm, size_t offs)
433{
434 if (!shm->kaddr)
435 return ERR_PTR(-EINVAL);
436 if (offs >= shm->size)
437 return ERR_PTR(-EINVAL);
438 return (char *)shm->kaddr + offs;
439}
440EXPORT_SYMBOL_GPL(tee_shm_get_va);
441
442/**
443 * tee_shm_get_pa() - Get physical address of a shared memory plus an offset
444 * @shm: Shared memory handle
445 * @offs: Offset from start of this shared memory
446 * @pa: Physical address to return
447 * @returns 0 if offs is within the bounds of this shared memory, else an
448 * error code.
449 */
450int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa)
451{
452 if (offs >= shm->size)
453 return -EINVAL;
454 if (pa)
455 *pa = shm->paddr + offs;
456 return 0;
457}
458EXPORT_SYMBOL_GPL(tee_shm_get_pa);
459
460/**
461 * tee_shm_get_from_id() - Find shared memory object and increase reference
462 * count
463 * @ctx: Context owning the shared memory
464 * @id: Id of shared memory object
465 * @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure
466 */
467struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id)
468{
469 struct tee_device *teedev;
470 struct tee_shm *shm;
471
472 if (!ctx)
473 return ERR_PTR(-EINVAL);
474
475 teedev = ctx->teedev;
476 mutex_lock(&teedev->mutex);
477 shm = idr_find(&teedev->idr, id);
478 /*
479 * If the tee_shm was found in the IDR it must have a refcount
480 * larger than 0 due to the guarantee in tee_shm_put() below. So
481 * it's safe to use refcount_inc().
482 */
483 if (!shm || shm->ctx != ctx)
484 shm = ERR_PTR(-EINVAL);
485 else
486 refcount_inc(&shm->refcount);
487 mutex_unlock(&teedev->mutex);
488 return shm;
489}
490EXPORT_SYMBOL_GPL(tee_shm_get_from_id);
491
492/**
493 * tee_shm_put() - Decrease reference count on a shared memory handle
494 * @shm: Shared memory handle
495 */
496void tee_shm_put(struct tee_shm *shm)
497{
498 struct tee_device *teedev = shm->ctx->teedev;
499 bool do_release = false;
500
501 mutex_lock(&teedev->mutex);
502 if (refcount_dec_and_test(&shm->refcount)) {
503 /*
504 * refcount has reached 0, we must now remove it from the
505 * IDR before releasing the mutex. This will guarantee that
506 * the refcount_inc() in tee_shm_get_from_id() never starts
507 * from 0.
508 */
509 if (shm->id >= 0)
510 idr_remove(&teedev->idr, shm->id);
511 do_release = true;
512 }
513 mutex_unlock(&teedev->mutex);
514
515 if (do_release)
516 tee_shm_release(teedev, shm);
517}
518EXPORT_SYMBOL_GPL(tee_shm_put);
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 "tee_private.h"
13
14static void tee_shm_release(struct tee_shm *shm)
15{
16 struct tee_device *teedev = shm->teedev;
17
18 mutex_lock(&teedev->mutex);
19 idr_remove(&teedev->idr, shm->id);
20 if (shm->ctx)
21 list_del(&shm->link);
22 mutex_unlock(&teedev->mutex);
23
24 if (shm->flags & TEE_SHM_POOL) {
25 struct tee_shm_pool_mgr *poolm;
26
27 if (shm->flags & TEE_SHM_DMA_BUF)
28 poolm = teedev->pool->dma_buf_mgr;
29 else
30 poolm = teedev->pool->private_mgr;
31
32 poolm->ops->free(poolm, shm);
33 } else if (shm->flags & TEE_SHM_REGISTER) {
34 size_t n;
35 int rc = teedev->desc->ops->shm_unregister(shm->ctx, shm);
36
37 if (rc)
38 dev_err(teedev->dev.parent,
39 "unregister shm %p failed: %d", shm, rc);
40
41 for (n = 0; n < shm->num_pages; n++)
42 put_page(shm->pages[n]);
43
44 kfree(shm->pages);
45 }
46
47 if (shm->ctx)
48 teedev_ctx_put(shm->ctx);
49
50 kfree(shm);
51
52 tee_device_put(teedev);
53}
54
55static struct sg_table *tee_shm_op_map_dma_buf(struct dma_buf_attachment
56 *attach, enum dma_data_direction dir)
57{
58 return NULL;
59}
60
61static void tee_shm_op_unmap_dma_buf(struct dma_buf_attachment *attach,
62 struct sg_table *table,
63 enum dma_data_direction dir)
64{
65}
66
67static void tee_shm_op_release(struct dma_buf *dmabuf)
68{
69 struct tee_shm *shm = dmabuf->priv;
70
71 tee_shm_release(shm);
72}
73
74static void *tee_shm_op_map(struct dma_buf *dmabuf, unsigned long pgnum)
75{
76 return NULL;
77}
78
79static int tee_shm_op_mmap(struct dma_buf *dmabuf, struct vm_area_struct *vma)
80{
81 struct tee_shm *shm = dmabuf->priv;
82 size_t size = vma->vm_end - vma->vm_start;
83
84 /* Refuse sharing shared memory provided by application */
85 if (shm->flags & TEE_SHM_REGISTER)
86 return -EINVAL;
87
88 return remap_pfn_range(vma, vma->vm_start, shm->paddr >> PAGE_SHIFT,
89 size, vma->vm_page_prot);
90}
91
92static const struct dma_buf_ops tee_shm_dma_buf_ops = {
93 .map_dma_buf = tee_shm_op_map_dma_buf,
94 .unmap_dma_buf = tee_shm_op_unmap_dma_buf,
95 .release = tee_shm_op_release,
96 .map = tee_shm_op_map,
97 .mmap = tee_shm_op_mmap,
98};
99
100static struct tee_shm *__tee_shm_alloc(struct tee_context *ctx,
101 struct tee_device *teedev,
102 size_t size, u32 flags)
103{
104 struct tee_shm_pool_mgr *poolm = NULL;
105 struct tee_shm *shm;
106 void *ret;
107 int rc;
108
109 if (ctx && ctx->teedev != teedev) {
110 dev_err(teedev->dev.parent, "ctx and teedev mismatch\n");
111 return ERR_PTR(-EINVAL);
112 }
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->teedev = teedev;
142 shm->ctx = ctx;
143 if (flags & TEE_SHM_DMA_BUF)
144 poolm = teedev->pool->dma_buf_mgr;
145 else
146 poolm = teedev->pool->private_mgr;
147
148 rc = poolm->ops->alloc(poolm, shm, size);
149 if (rc) {
150 ret = ERR_PTR(rc);
151 goto err_kfree;
152 }
153
154 mutex_lock(&teedev->mutex);
155 shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL);
156 mutex_unlock(&teedev->mutex);
157 if (shm->id < 0) {
158 ret = ERR_PTR(shm->id);
159 goto err_pool_free;
160 }
161
162 if (flags & TEE_SHM_DMA_BUF) {
163 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
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 if (ctx) {
178 teedev_ctx_get(ctx);
179 mutex_lock(&teedev->mutex);
180 list_add_tail(&shm->link, &ctx->list_shm);
181 mutex_unlock(&teedev->mutex);
182 }
183
184 return shm;
185err_rem:
186 mutex_lock(&teedev->mutex);
187 idr_remove(&teedev->idr, shm->id);
188 mutex_unlock(&teedev->mutex);
189err_pool_free:
190 poolm->ops->free(poolm, shm);
191err_kfree:
192 kfree(shm);
193err_dev_put:
194 tee_device_put(teedev);
195 return ret;
196}
197
198/**
199 * tee_shm_alloc() - Allocate shared memory
200 * @ctx: Context that allocates the shared memory
201 * @size: Requested size of shared memory
202 * @flags: Flags setting properties for the requested shared memory.
203 *
204 * Memory allocated as global shared memory is automatically freed when the
205 * TEE file pointer is closed. The @flags field uses the bits defined by
206 * TEE_SHM_* in <linux/tee_drv.h>. TEE_SHM_MAPPED must currently always be
207 * set. If TEE_SHM_DMA_BUF global shared memory will be allocated and
208 * associated with a dma-buf handle, else driver private memory.
209 */
210struct tee_shm *tee_shm_alloc(struct tee_context *ctx, size_t size, u32 flags)
211{
212 return __tee_shm_alloc(ctx, ctx->teedev, size, flags);
213}
214EXPORT_SYMBOL_GPL(tee_shm_alloc);
215
216struct tee_shm *tee_shm_priv_alloc(struct tee_device *teedev, size_t size)
217{
218 return __tee_shm_alloc(NULL, teedev, size, TEE_SHM_MAPPED);
219}
220EXPORT_SYMBOL_GPL(tee_shm_priv_alloc);
221
222struct tee_shm *tee_shm_register(struct tee_context *ctx, unsigned long addr,
223 size_t length, u32 flags)
224{
225 struct tee_device *teedev = ctx->teedev;
226 const u32 req_flags = TEE_SHM_DMA_BUF | TEE_SHM_USER_MAPPED;
227 struct tee_shm *shm;
228 void *ret;
229 int rc;
230 int num_pages;
231 unsigned long start;
232
233 if (flags != req_flags)
234 return ERR_PTR(-ENOTSUPP);
235
236 if (!tee_device_get(teedev))
237 return ERR_PTR(-EINVAL);
238
239 if (!teedev->desc->ops->shm_register ||
240 !teedev->desc->ops->shm_unregister) {
241 tee_device_put(teedev);
242 return ERR_PTR(-ENOTSUPP);
243 }
244
245 teedev_ctx_get(ctx);
246
247 shm = kzalloc(sizeof(*shm), GFP_KERNEL);
248 if (!shm) {
249 ret = ERR_PTR(-ENOMEM);
250 goto err;
251 }
252
253 shm->flags = flags | TEE_SHM_REGISTER;
254 shm->teedev = teedev;
255 shm->ctx = ctx;
256 shm->id = -1;
257 addr = untagged_addr(addr);
258 start = rounddown(addr, PAGE_SIZE);
259 shm->offset = addr - start;
260 shm->size = length;
261 num_pages = (roundup(addr + length, PAGE_SIZE) - start) / PAGE_SIZE;
262 shm->pages = kcalloc(num_pages, sizeof(*shm->pages), GFP_KERNEL);
263 if (!shm->pages) {
264 ret = ERR_PTR(-ENOMEM);
265 goto err;
266 }
267
268 rc = get_user_pages_fast(start, num_pages, FOLL_WRITE, shm->pages);
269 if (rc > 0)
270 shm->num_pages = rc;
271 if (rc != num_pages) {
272 if (rc >= 0)
273 rc = -ENOMEM;
274 ret = ERR_PTR(rc);
275 goto err;
276 }
277
278 mutex_lock(&teedev->mutex);
279 shm->id = idr_alloc(&teedev->idr, shm, 1, 0, GFP_KERNEL);
280 mutex_unlock(&teedev->mutex);
281
282 if (shm->id < 0) {
283 ret = ERR_PTR(shm->id);
284 goto err;
285 }
286
287 rc = teedev->desc->ops->shm_register(ctx, shm, shm->pages,
288 shm->num_pages, start);
289 if (rc) {
290 ret = ERR_PTR(rc);
291 goto err;
292 }
293
294 if (flags & TEE_SHM_DMA_BUF) {
295 DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
296
297 exp_info.ops = &tee_shm_dma_buf_ops;
298 exp_info.size = shm->size;
299 exp_info.flags = O_RDWR;
300 exp_info.priv = shm;
301
302 shm->dmabuf = dma_buf_export(&exp_info);
303 if (IS_ERR(shm->dmabuf)) {
304 ret = ERR_CAST(shm->dmabuf);
305 teedev->desc->ops->shm_unregister(ctx, shm);
306 goto err;
307 }
308 }
309
310 mutex_lock(&teedev->mutex);
311 list_add_tail(&shm->link, &ctx->list_shm);
312 mutex_unlock(&teedev->mutex);
313
314 return shm;
315err:
316 if (shm) {
317 size_t n;
318
319 if (shm->id >= 0) {
320 mutex_lock(&teedev->mutex);
321 idr_remove(&teedev->idr, shm->id);
322 mutex_unlock(&teedev->mutex);
323 }
324 if (shm->pages) {
325 for (n = 0; n < shm->num_pages; n++)
326 put_page(shm->pages[n]);
327 kfree(shm->pages);
328 }
329 }
330 kfree(shm);
331 teedev_ctx_put(ctx);
332 tee_device_put(teedev);
333 return ret;
334}
335EXPORT_SYMBOL_GPL(tee_shm_register);
336
337/**
338 * tee_shm_get_fd() - Increase reference count and return file descriptor
339 * @shm: Shared memory handle
340 * @returns user space file descriptor to shared memory
341 */
342int tee_shm_get_fd(struct tee_shm *shm)
343{
344 int fd;
345
346 if (!(shm->flags & TEE_SHM_DMA_BUF))
347 return -EINVAL;
348
349 get_dma_buf(shm->dmabuf);
350 fd = dma_buf_fd(shm->dmabuf, O_CLOEXEC);
351 if (fd < 0)
352 dma_buf_put(shm->dmabuf);
353 return fd;
354}
355
356/**
357 * tee_shm_free() - Free shared memory
358 * @shm: Handle to shared memory to free
359 */
360void tee_shm_free(struct tee_shm *shm)
361{
362 /*
363 * dma_buf_put() decreases the dmabuf reference counter and will
364 * call tee_shm_release() when the last reference is gone.
365 *
366 * In the case of driver private memory we call tee_shm_release
367 * directly instead as it doesn't have a reference counter.
368 */
369 if (shm->flags & TEE_SHM_DMA_BUF)
370 dma_buf_put(shm->dmabuf);
371 else
372 tee_shm_release(shm);
373}
374EXPORT_SYMBOL_GPL(tee_shm_free);
375
376/**
377 * tee_shm_va2pa() - Get physical address of a virtual address
378 * @shm: Shared memory handle
379 * @va: Virtual address to tranlsate
380 * @pa: Returned physical address
381 * @returns 0 on success and < 0 on failure
382 */
383int tee_shm_va2pa(struct tee_shm *shm, void *va, phys_addr_t *pa)
384{
385 if (!(shm->flags & TEE_SHM_MAPPED))
386 return -EINVAL;
387 /* Check that we're in the range of the shm */
388 if ((char *)va < (char *)shm->kaddr)
389 return -EINVAL;
390 if ((char *)va >= ((char *)shm->kaddr + shm->size))
391 return -EINVAL;
392
393 return tee_shm_get_pa(
394 shm, (unsigned long)va - (unsigned long)shm->kaddr, pa);
395}
396EXPORT_SYMBOL_GPL(tee_shm_va2pa);
397
398/**
399 * tee_shm_pa2va() - Get virtual address of a physical address
400 * @shm: Shared memory handle
401 * @pa: Physical address to tranlsate
402 * @va: Returned virtual address
403 * @returns 0 on success and < 0 on failure
404 */
405int tee_shm_pa2va(struct tee_shm *shm, phys_addr_t pa, void **va)
406{
407 if (!(shm->flags & TEE_SHM_MAPPED))
408 return -EINVAL;
409 /* Check that we're in the range of the shm */
410 if (pa < shm->paddr)
411 return -EINVAL;
412 if (pa >= (shm->paddr + shm->size))
413 return -EINVAL;
414
415 if (va) {
416 void *v = tee_shm_get_va(shm, pa - shm->paddr);
417
418 if (IS_ERR(v))
419 return PTR_ERR(v);
420 *va = v;
421 }
422 return 0;
423}
424EXPORT_SYMBOL_GPL(tee_shm_pa2va);
425
426/**
427 * tee_shm_get_va() - Get virtual address of a shared memory plus an offset
428 * @shm: Shared memory handle
429 * @offs: Offset from start of this shared memory
430 * @returns virtual address of the shared memory + offs if offs is within
431 * the bounds of this shared memory, else an ERR_PTR
432 */
433void *tee_shm_get_va(struct tee_shm *shm, size_t offs)
434{
435 if (!(shm->flags & TEE_SHM_MAPPED))
436 return ERR_PTR(-EINVAL);
437 if (offs >= shm->size)
438 return ERR_PTR(-EINVAL);
439 return (char *)shm->kaddr + offs;
440}
441EXPORT_SYMBOL_GPL(tee_shm_get_va);
442
443/**
444 * tee_shm_get_pa() - Get physical address of a shared memory plus an offset
445 * @shm: Shared memory handle
446 * @offs: Offset from start of this shared memory
447 * @pa: Physical address to return
448 * @returns 0 if offs is within the bounds of this shared memory, else an
449 * error code.
450 */
451int tee_shm_get_pa(struct tee_shm *shm, size_t offs, phys_addr_t *pa)
452{
453 if (offs >= shm->size)
454 return -EINVAL;
455 if (pa)
456 *pa = shm->paddr + offs;
457 return 0;
458}
459EXPORT_SYMBOL_GPL(tee_shm_get_pa);
460
461/**
462 * tee_shm_get_from_id() - Find shared memory object and increase reference
463 * count
464 * @ctx: Context owning the shared memory
465 * @id: Id of shared memory object
466 * @returns a pointer to 'struct tee_shm' on success or an ERR_PTR on failure
467 */
468struct tee_shm *tee_shm_get_from_id(struct tee_context *ctx, int id)
469{
470 struct tee_device *teedev;
471 struct tee_shm *shm;
472
473 if (!ctx)
474 return ERR_PTR(-EINVAL);
475
476 teedev = ctx->teedev;
477 mutex_lock(&teedev->mutex);
478 shm = idr_find(&teedev->idr, id);
479 if (!shm || shm->ctx != ctx)
480 shm = ERR_PTR(-EINVAL);
481 else if (shm->flags & TEE_SHM_DMA_BUF)
482 get_dma_buf(shm->dmabuf);
483 mutex_unlock(&teedev->mutex);
484 return shm;
485}
486EXPORT_SYMBOL_GPL(tee_shm_get_from_id);
487
488/**
489 * tee_shm_put() - Decrease reference count on a shared memory handle
490 * @shm: Shared memory handle
491 */
492void tee_shm_put(struct tee_shm *shm)
493{
494 if (shm->flags & TEE_SHM_DMA_BUF)
495 dma_buf_put(shm->dmabuf);
496}
497EXPORT_SYMBOL_GPL(tee_shm_put);