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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015, Linaro Limited
* Copyright (c) 2017, EPAM Systems
*/
#include <linux/device.h>
#include <linux/dma-buf.h>
#include <linux/genalloc.h>
#include <linux/slab.h>
#include <linux/tee_drv.h>
#include "optee_private.h"
#include "optee_smc.h"
#include "shm_pool.h"
static int pool_op_alloc(struct tee_shm_pool_mgr *poolm,
struct tee_shm *shm, size_t size)
{
unsigned int order = get_order(size);
struct page *page;
int rc = 0;
page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order);
if (!page)
return -ENOMEM;
shm->kaddr = page_address(page);
shm->paddr = page_to_phys(page);
shm->size = PAGE_SIZE << order;
/*
* Shared memory private to the OP-TEE driver doesn't need
* to be registered with OP-TEE.
*/
if (!(shm->flags & TEE_SHM_PRIV)) {
unsigned int nr_pages = 1 << order, i;
struct page **pages;
pages = kcalloc(nr_pages, sizeof(pages), GFP_KERNEL);
if (!pages) {
rc = -ENOMEM;
goto err;
}
for (i = 0; i < nr_pages; i++) {
pages[i] = page;
page++;
}
shm->flags |= TEE_SHM_REGISTER;
rc = optee_shm_register(shm->ctx, shm, pages, nr_pages,
(unsigned long)shm->kaddr);
kfree(pages);
if (rc)
goto err;
}
return 0;
err:
__free_pages(page, order);
return rc;
}
static void pool_op_free(struct tee_shm_pool_mgr *poolm,
struct tee_shm *shm)
{
if (!(shm->flags & TEE_SHM_PRIV))
optee_shm_unregister(shm->ctx, shm);
free_pages((unsigned long)shm->kaddr, get_order(shm->size));
shm->kaddr = NULL;
}
static void pool_op_destroy_poolmgr(struct tee_shm_pool_mgr *poolm)
{
kfree(poolm);
}
static const struct tee_shm_pool_mgr_ops pool_ops = {
.alloc = pool_op_alloc,
.free = pool_op_free,
.destroy_poolmgr = pool_op_destroy_poolmgr,
};
/**
* optee_shm_pool_alloc_pages() - create page-based allocator pool
*
* This pool is used when OP-TEE supports dymanic SHM. In this case
* command buffers and such are allocated from kernel's own memory.
*/
struct tee_shm_pool_mgr *optee_shm_pool_alloc_pages(void)
{
struct tee_shm_pool_mgr *mgr = kzalloc(sizeof(*mgr), GFP_KERNEL);
if (!mgr)
return ERR_PTR(-ENOMEM);
mgr->ops = &pool_ops;
return mgr;
}
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