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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/tee/tee_shm_pool.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/tee/tee_shm_pool.c')
-rw-r--r-- | drivers/tee/tee_shm_pool.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/drivers/tee/tee_shm_pool.c b/drivers/tee/tee_shm_pool.c new file mode 100644 index 000000000..058bfbac6 --- /dev/null +++ b/drivers/tee/tee_shm_pool.c @@ -0,0 +1,92 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2015, 2017, 2022 Linaro Limited + */ +#include <linux/device.h> +#include <linux/dma-buf.h> +#include <linux/genalloc.h> +#include <linux/slab.h> +#include <linux/tee_drv.h> +#include "tee_private.h" + +static int pool_op_gen_alloc(struct tee_shm_pool *pool, struct tee_shm *shm, + size_t size, size_t align) +{ + unsigned long va; + struct gen_pool *genpool = pool->private_data; + size_t a = max_t(size_t, align, BIT(genpool->min_alloc_order)); + struct genpool_data_align data = { .align = a }; + size_t s = roundup(size, a); + + va = gen_pool_alloc_algo(genpool, s, gen_pool_first_fit_align, &data); + if (!va) + return -ENOMEM; + + memset((void *)va, 0, s); + shm->kaddr = (void *)va; + shm->paddr = gen_pool_virt_to_phys(genpool, va); + shm->size = s; + /* + * This is from a static shared memory pool so no need to register + * each chunk, and no need to unregister later either. + */ + shm->flags &= ~TEE_SHM_DYNAMIC; + return 0; +} + +static void pool_op_gen_free(struct tee_shm_pool *pool, struct tee_shm *shm) +{ + gen_pool_free(pool->private_data, (unsigned long)shm->kaddr, + shm->size); + shm->kaddr = NULL; +} + +static void pool_op_gen_destroy_pool(struct tee_shm_pool *pool) +{ + gen_pool_destroy(pool->private_data); + kfree(pool); +} + +static const struct tee_shm_pool_ops pool_ops_generic = { + .alloc = pool_op_gen_alloc, + .free = pool_op_gen_free, + .destroy_pool = pool_op_gen_destroy_pool, +}; + +struct tee_shm_pool *tee_shm_pool_alloc_res_mem(unsigned long vaddr, + phys_addr_t paddr, size_t size, + int min_alloc_order) +{ + const size_t page_mask = PAGE_SIZE - 1; + struct tee_shm_pool *pool; + int rc; + + /* Start and end must be page aligned */ + if (vaddr & page_mask || paddr & page_mask || size & page_mask) + return ERR_PTR(-EINVAL); + + pool = kzalloc(sizeof(*pool), GFP_KERNEL); + if (!pool) + return ERR_PTR(-ENOMEM); + + pool->private_data = gen_pool_create(min_alloc_order, -1); + if (!pool->private_data) { + rc = -ENOMEM; + goto err; + } + + rc = gen_pool_add_virt(pool->private_data, vaddr, paddr, size, -1); + if (rc) { + gen_pool_destroy(pool->private_data); + goto err; + } + + pool->ops = &pool_ops_generic; + + return pool; +err: + kfree(pool); + + return ERR_PTR(rc); +} +EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem); |