Volodymyr Babchuk <volodymyr_babc...@epam.com> writes:
> From: Volodymyr Babchuk <vlad.babc...@gmail.com>
>
> 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.babc...@gmail.com>
> ---
> drivers/tee/optee/core.c | 83
> ++++++++++++++++++++++++++++--------------------
> 1 file changed, 49 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
> index 4a2c420..d80da29 100644
> --- a/drivers/tee/optee/core.c
> +++ b/drivers/tee/optee/core.c
> @@ -420,9 +420,35 @@ 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;
> @@ -437,10 +463,11 @@ 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);
> }
>
> @@ -466,28 +493,15 @@ 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;
> -
> - vaddr += sz;
> - paddr += sz;
> - size -= sz;
> - }
> + 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;
>
> rc = tee_shm_pool_mgr_alloc_res_mem(vaddr, paddr, size, PAGE_SHIFT);
> if (IS_ERR(rc))
> @@ -553,7 +567,7 @@ 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;
> @@ -582,13 +596,17 @@ 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;
>
-- BEGIN --
> @@ -632,9 +650,6 @@ static struct optee *optee_probe(struct device_node *np)
>
> optee_enable_shm_cache(optee);
>
> - if (optee->sec_caps & OPTEE_SMC_SEC_CAP_DYNAMIC_SHM)
> - pr_info("dynamic shared memory is enabled\n");
> -
> pr_info("initialized driver\n");
> return optee;
> err:
-- END --
This part does not apply against upstream.
Greetings
Rouven
