tee_shm_pool.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015, 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_mgr *poolm,
struct tee_shm *shm, size_t size)
{
unsigned long va;
struct gen_pool *genpool = poolm->private_data;
size_t s = roundup(size, 1 << genpool->min_alloc_order);
va = gen_pool_alloc(genpool, s);
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;
return 0;
}
static void pool_op_gen_free(struct tee_shm_pool_mgr *poolm,
struct tee_shm *shm)
{
gen_pool_free(poolm->private_data, (unsigned long)shm->kaddr,
shm->size);
shm->kaddr = NULL;
}
static void pool_op_gen_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
{
gen_pool_destroy(poolm->private_data);
kfree(poolm);
}
static const struct tee_shm_pool_mgr_ops pool_ops_generic = {
.alloc = pool_op_gen_alloc,
.free = pool_op_gen_free,
.destroy_poolmgr = pool_op_gen_destroy_poolmgr,
};
/**
* tee_shm_pool_alloc_res_mem() - Create a shared memory pool from reserved
* memory range
* @priv_info: Information for driver private shared memory pool
* @dmabuf_info: Information for dma-buf shared memory pool
*
* Start and end of pools will must be page aligned.
*
* Allocation with the flag TEE_SHM_DMA_BUF set will use the range supplied
* in @dmabuf, others will use the range provided by @priv.
*
* @returns pointer to a 'struct tee_shm_pool' or an ERR_PTR on failure.
*/
struct tee_shm_pool *
tee_shm_pool_alloc_res_mem(struct tee_shm_pool_mem_info *priv_info,
struct tee_shm_pool_mem_info *dmabuf_info)
{
struct tee_shm_pool_mgr *priv_mgr;
struct tee_shm_pool_mgr *dmabuf_mgr;
void *rc;
/*
* Create the pool for driver private shared memory
*/
rc = tee_shm_pool_mgr_alloc_res_mem(priv_info->vaddr, priv_info->paddr,
priv_info->size,
3 /* 8 byte aligned */);
if (IS_ERR(rc))
return rc;
priv_mgr = rc;
/*
* Create the pool for dma_buf shared memory
*/
rc = tee_shm_pool_mgr_alloc_res_mem(dmabuf_info->vaddr,
dmabuf_info->paddr,
dmabuf_info->size, PAGE_SHIFT);
if (IS_ERR(rc))
goto err_free_priv_mgr;
dmabuf_mgr = rc;
rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
if (IS_ERR(rc))
goto err_free_dmabuf_mgr;
return rc;
err_free_dmabuf_mgr:
tee_shm_pool_mgr_destroy(dmabuf_mgr);
err_free_priv_mgr:
tee_shm_pool_mgr_destroy(priv_mgr);
return rc;
}
EXPORT_SYMBOL_GPL(tee_shm_pool_alloc_res_mem);
struct tee_shm_pool_mgr *tee_shm_pool_mgr_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_mgr *mgr;
int rc;
/* Start and end must be page aligned */
if (vaddr & page_mask || paddr & page_mask || size & page_mask)
return ERR_PTR(-EINVAL);
mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
if (!mgr)
return ERR_PTR(-ENOMEM);
mgr->private_data = gen_pool_create(min_alloc_order, -1);
if (!mgr->private_data) {
rc = -ENOMEM;
goto err;
}
gen_pool_set_algo(mgr->private_data, gen_pool_best_fit, NULL);
rc = gen_pool_add_virt(mgr->private_data, vaddr, paddr, size, -1);
if (rc) {
gen_pool_destroy(mgr->private_data);
goto err;
}
mgr->ops = &pool_ops_generic;
return mgr;
err:
kfree(mgr);
return ERR_PTR(rc);
}
EXPORT_SYMBOL_GPL(tee_shm_pool_mgr_alloc_res_mem);
static bool check_mgr_ops(struct tee_shm_pool_mgr *mgr)
{
return mgr && mgr->ops && mgr->ops->alloc && mgr->ops->free &&
mgr->ops->destroy_poolmgr;
}
struct tee_shm_pool *tee_shm_pool_alloc(struct tee_shm_pool_mgr *priv_mgr,
struct tee_shm_pool_mgr *dmabuf_mgr)
{
struct tee_shm_pool *pool;
if (!check_mgr_ops(priv_mgr) || !check_mgr_ops(dmabuf_mgr))
return ERR_PTR(-EINVAL);
pool = kzalloc(sizeof(*pool), GFP_KERNEL);
if (!pool)
return ERR_PTR(-ENOMEM);
pool->private_mgr = priv_mgr;
pool->dma_buf_mgr = dmabuf_mgr;
return pool;
}
EXPORT_SYMBOL_GPL(tee_shm_pool_alloc);
/**
* tee_shm_pool_free() - Free a shared memory pool
* @pool: The shared memory pool to free
*
* There must be no remaining shared memory allocated from this pool when
* this function is called.
*/
void tee_shm_pool_free(struct tee_shm_pool *pool)
{
if (pool->private_mgr)
tee_shm_pool_mgr_destroy(pool->private_mgr);
if (pool->dma_buf_mgr)
tee_shm_pool_mgr_destroy(pool->dma_buf_mgr);
kfree(pool);
}
EXPORT_SYMBOL_GPL(tee_shm_pool_free);