1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (c) 2015, 2017, 2022 Linaro Limited 4 */ 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 12 static 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 register 31 * each chunk, and no need to unregister later either. 32 */ 33 shm->flags &= ~TEE_SHM_DYNAMIC; 34 return 0; 35 } 36 37 static 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 44 static void pool_op_gen_destroy_pool(struct tee_shm_pool *pool) 45 { 46 gen_pool_destroy(pool->private_data); 47 kfree(pool); 48 } 49 50 static 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 56 struct 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; 87 err: 88 kfree(pool); 89 90 return ERR_PTR(rc); 91 } 92 EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem); 93