93 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (c) 2015, 2017, 2022 Linaro Limited4 */5#include <linux/device.h>6#include <linux/dma-buf.h>7#include <linux/genalloc.h>8#include <linux/slab.h>9#include <linux/tee_core.h>10#include "tee_private.h"11 12static int pool_op_gen_alloc(struct tee_shm_pool *pool, struct tee_shm *shm,13 size_t size, size_t align)14{15 unsigned long va;16 struct gen_pool *genpool = pool->private_data;17 size_t a = max_t(size_t, align, BIT(genpool->min_alloc_order));18 struct genpool_data_align data = { .align = a };19 size_t s = roundup(size, a);20 21 va = gen_pool_alloc_algo(genpool, s, gen_pool_first_fit_align, &data);22 if (!va)23 return -ENOMEM;24 25 memset((void *)va, 0, s);26 shm->kaddr = (void *)va;27 shm->paddr = gen_pool_virt_to_phys(genpool, va);28 shm->size = s;29 /*30 * This is from a static shared memory pool so no need to register31 * each chunk, and no need to unregister later either.32 */33 shm->flags &= ~TEE_SHM_DYNAMIC;34 return 0;35}36 37static void pool_op_gen_free(struct tee_shm_pool *pool, struct tee_shm *shm)38{39 gen_pool_free(pool->private_data, (unsigned long)shm->kaddr,40 shm->size);41 shm->kaddr = NULL;42}43 44static void pool_op_gen_destroy_pool(struct tee_shm_pool *pool)45{46 gen_pool_destroy(pool->private_data);47 kfree(pool);48}49 50static const struct tee_shm_pool_ops pool_ops_generic = {51 .alloc = pool_op_gen_alloc,52 .free = pool_op_gen_free,53 .destroy_pool = pool_op_gen_destroy_pool,54};55 56struct tee_shm_pool *tee_shm_pool_alloc_res_mem(unsigned long vaddr,57 phys_addr_t paddr, size_t size,58 int min_alloc_order)59{60 const size_t page_mask = PAGE_SIZE - 1;61 struct tee_shm_pool *pool;62 int rc;63 64 /* Start and end must be page aligned */65 if (vaddr & page_mask || paddr & page_mask || size & page_mask)66 return ERR_PTR(-EINVAL);67 68 pool = kzalloc(sizeof(*pool), GFP_KERNEL);69 if (!pool)70 return ERR_PTR(-ENOMEM);71 72 pool->private_data = gen_pool_create(min_alloc_order, -1);73 if (!pool->private_data) {74 rc = -ENOMEM;75 goto err;76 }77 78 rc = gen_pool_add_virt(pool->private_data, vaddr, paddr, size, -1);79 if (rc) {80 gen_pool_destroy(pool->private_data);81 goto err;82 }83 84 pool->ops = &pool_ops_generic;85 86 return pool;87err:88 kfree(pool);89 90 return ERR_PTR(rc);91}92EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem);93