[PATCH v2 12/15] security: optee: add helpers to register OF overlays

[Ahmad Fatoum]

On 2/4/26 9:01 PM, Marco Felsch wrote:
> Add two helpers to make the OP-TEE overlay handling more convenient.
> 
> The first helper registers an optional OF overlay provided by
> barebox-pbl.
> The second helper can be used to query the status of the OF overlay, e.g
> registered or not-registered.
> 
> Signed-off-by: Marco Felsch <m.felsch at pengutronix.de>

With below memory leak fixed:

Reviewed-by: Ahmad Fatoum <a.fatoum at pengutronix.de>

> ---
>  drivers/tee/optee/of_fixup.c | 41 +++++++++++++++++++++++++++++++++++++++++
>  include/tee/optee.h          | 11 +++++++++++
>  2 files changed, 52 insertions(+)
> 
> diff --git a/drivers/tee/optee/of_fixup.c b/drivers/tee/optee/of_fixup.c
> index 152322901a7e6af9c83da4c6a2d43f6e2c9af329..dbcc168201828d350f4545a07ce5f2676f18d09e 100644
> --- a/drivers/tee/optee/of_fixup.c
> +++ b/drivers/tee/optee/of_fixup.c
> @@ -1,7 +1,10 @@
>  /* SPDX-License-Identifier: GPL-2.0-only */
>  
> +#define pr_fmt(fmt) "OP-TEE OF: " fmt
> +
>  #include <of.h>
>  #include <linux/ioport.h>
> +#include <linux/printk.h>
>  #include <asm/barebox-arm.h>
>  #include <tee/optee.h>
>  
> @@ -64,3 +67,41 @@ int of_optee_fixup(struct device_node *root, void *_data)
>  
>  	return of_fixup_reserved_memory(root, &res_shm);
>  }
> +
> +static bool optee_ovl_registered;
> +
> +void optee_register_overlay(void)
> +{
> +	struct device_node *overlay;
> +	size_t size = 0;
> +	void *fdto;
> +	int err;
> +
> +	if (optee_ovl_registered) {
> +		pr_warn("overlay already registered, skip\n");
> +		return;
> +	}
> +
> +	fdto = handoff_data_get_entry(HANDOFF_DATA_TEE_DT_OVL, &size);
> +	if (!fdto || size == 0)
> +		return;
> +
> +	overlay = of_unflatten_dtb(fdto, size);
> +	if (IS_ERR(overlay)) {
> +		pr_warn("failed to unflatten overlay: %pe\n", overlay);
> +		return;
> +	}
> +
> +	err = of_register_overlay(overlay);
> +	if (err) {
> +		pr_warn("failed to register overlay: %pe\n", ERR_PTR(err));
> +		return;
> +	}

I believe you'll want to add a of_delete_node(overlay); here

> +
> +	optee_ovl_registered = true;
> +}
> +
> +bool optee_overlay_registered(void)
> +{
> +	return optee_ovl_registered;
> +}
> diff --git a/include/tee/optee.h b/include/tee/optee.h
> index 7126e3c6e24bbf0f37aee7827dc3b4d9619d3bc3..0c9a6e5e64723ca743d53b8cd1ffdefae5bd3c6f 100644
> --- a/include/tee/optee.h
> +++ b/include/tee/optee.h
> @@ -38,6 +38,8 @@ int optee_verify_header (const struct optee_header *hdr);
>  void optee_set_membase(const struct optee_header *hdr);
>  int optee_get_membase(u64 *membase);
>  void optee_handoff_overlay(void *ovl, unsigned int ovl_sz);
> +void optee_register_overlay(void);
> +bool optee_overlay_registered(void);
>  
>  #else
>  
> @@ -54,6 +56,15 @@ void optee_handoff_overlay(void *ovl, unsigned int ovl_sz)
>  {
>  }
>  
> +static inline void optee_register_overlay(void)
> +{
> +}
> +
> +static inline bool optee_overlay_registered(void)
> +{
> +	return false;
> +}
> +
>  #endif /* CONFIG_HAVE_OPTEE */
>  
>  #ifdef __PBL__
> 

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