mirror of
https://github.com/Fishwaldo/Star64_linux.git
synced 2025-04-28 17:24:01 +00:00
376e4199e3
Currently TEE_SHM_DMA_BUF flag has been inappropriately used to not register shared memory allocated for private usage by underlying TEE driver: OP-TEE in this case. So rather add a new flag as TEE_SHM_PRIV that can be utilized by underlying TEE drivers for private allocation and usage of shared memory. With this corrected, allow tee_shm_alloc_kernel_buf() to allocate a shared memory region without the backing of dma-buf. Cc: stable@vger.kernel.org Signed-off-by: Sumit Garg <sumit.garg@linaro.org> Co-developed-by: Tyler Hicks <tyhicks@linux.microsoft.com> Signed-off-by: Tyler Hicks <tyhicks@linux.microsoft.com> Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org> Reviewed-by: Sumit Garg <sumit.garg@linaro.org> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
101 lines
2.1 KiB
C
101 lines
2.1 KiB
C
// 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;
|
|
}
|