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optee: allow to work without static shared memory

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On virtualized systems it is possible that OP-TEE will provide
only dynamic shared memory support. So it is fine to boot
without static SHM enabled if dymanic one is supported.

Signed-off-by: Volodymyr Babchuk <vlad.babchuk@gmail.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
This commit is contained in:
Volodymyr Babchuk 2018-09-07 21:37:07 +03:00 committed by Jens Wiklander
parent 1c163f4c7b
commit 9733b072a1
1 changed files with 48 additions and 30 deletions
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78
drivers/tee/optee/core.c
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@ -419,9 +419,35 @@ static bool optee_msg_exchange_capabilities(optee_invoke_fn *invoke_fn,
return true;
}
static struct tee_shm_pool *optee_config_dyn_shm(void)
{
struct tee_shm_pool_mgr *priv_mgr;
struct tee_shm_pool_mgr *dmabuf_mgr;
void *rc;
rc = optee_shm_pool_alloc_pages();
if (IS_ERR(rc))
return rc;
priv_mgr = rc;
rc = optee_shm_pool_alloc_pages();
if (IS_ERR(rc)) {
tee_shm_pool_mgr_destroy(priv_mgr);
return rc;
}
dmabuf_mgr = rc;
rc = tee_shm_pool_alloc(priv_mgr, dmabuf_mgr);
if (IS_ERR(rc)) {
tee_shm_pool_mgr_destroy(priv_mgr);
tee_shm_pool_mgr_destroy(dmabuf_mgr);
}
return rc;
}
static struct tee_shm_pool *
optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm,
u32 sec_caps)
optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
{
union {
struct arm_smccc_res smccc;
@ -436,10 +462,11 @@ optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm,
struct tee_shm_pool_mgr *priv_mgr;
struct tee_shm_pool_mgr *dmabuf_mgr;
void *rc;
const int sz = OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;
invoke_fn(OPTEE_SMC_GET_SHM_CONFIG, 0, 0, 0, 0, 0, 0, 0, &res.smccc);
if (res.result.status != OPTEE_SMC_RETURN_OK) {
pr_info("shm service not available\n");
pr_err("static shm service not available\n");
return ERR_PTR(-ENOENT);
}
@ -465,28 +492,15 @@ optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm,
}
vaddr = (unsigned long)va;
/*
* If OP-TEE can work with unregistered SHM, we will use own pool
* for private shm
*/
if (sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM) {
rc = optee_shm_pool_alloc_pages();
if (IS_ERR(rc))
goto err_memunmap;
priv_mgr = rc;
} else {
const size_t sz = OPTEE_SHM_NUM_PRIV_PAGES * PAGE_SIZE;
rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, sz,
3 /* 8 bytes aligned */);
if (IS_ERR(rc))
goto err_memunmap;
priv_mgr = rc;
rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, sz,
3 /* 8 bytes aligned */);
if (IS_ERR(rc))
goto err_memunmap;
priv_mgr = rc;
vaddr += sz;
paddr += sz;
size -= sz;
}
vaddr += sz;
paddr += sz;
size -= sz;
rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, size, PAGE_SHIFT);
if (IS_ERR(rc))
@ -552,7 +566,7 @@ static optee_invoke_fn *get_invoke_func(struct device_node *np)
static struct optee *optee_probe(struct device_node *np)
{
optee_invoke_fn *invoke_fn;
struct tee_shm_pool *pool;
struct tee_shm_pool *pool = ERR_PTR(-EINVAL);
struct optee *optee = NULL;
void *memremaped_shm = NULL;
struct tee_device *teedev;
@ -581,13 +595,17 @@ static struct optee *optee_probe(struct device_node *np)
}
/*
* We have no other option for shared memory, if secure world
* doesn't have any reserved memory we can use we can't continue.
* Try to use dynamic shared memory if possible
*/
if (!(sec_caps & OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM))
return ERR_PTR(-EINVAL);
if (sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
pool = optee_config_dyn_shm();
/*
* If dynamic shared memory is not available or failed - try static one
*/
if (IS_ERR(pool) && (sec_caps & OPTEE_SMC_SEC_CAP_HAVE_RESERVED_SHM))
pool = optee_config_shm_memremap(invoke_fn, &memremaped_shm);
pool = optee_config_shm_memremap(invoke_fn, &memremaped_shm, sec_caps);
if (IS_ERR(pool))
return (void *)pool;