On Thu, 4 Jul 2024 at 00:40, Amirreza Zarrabi <quic_azarrabi@xxxxxxxxxxx> wrote: > > > > On 7/3/2024 10:13 PM, Dmitry Baryshkov wrote: > > On Tue, Jul 02, 2024 at 10:57:36PM GMT, Amirreza Zarrabi wrote: > >> Qualcomm TEE hosts Trusted Applications and Services that run in the > >> secure world. Access to these resources is provided using object > >> capabilities. A TEE client with access to the capability can invoke > >> the object and request a service. Similarly, TEE can request a service > >> from nonsecure world with object capabilities that are exported to secure > >> world. > >> > >> We provide qcom_tee_object which represents an object in both secure > >> and nonsecure world. TEE clients can invoke an instance of qcom_tee_object > >> to access TEE. TEE can issue a callback request to nonsecure world > >> by invoking an instance of qcom_tee_object in nonsecure world. > > > > Please see Documentation/process/submitting-patches.rst on how to write > > commit messages. > > Ack. > > > > >> > >> Any driver in nonsecure world that is interested to export a struct (or a > >> service object) to TEE, requires to embed an instance of qcom_tee_object in > >> the relevant struct and implements the dispatcher function which is called > >> when TEE invoked the service object. > >> > >> We also provids simplified API which implements the Qualcomm TEE transport > >> protocol. The implementation is independent from any services that may > >> reside in nonsecure world. > > > > "also" usually means that it should go to a separate commit. > > I will split this patch to multiple smaller ones. > [...] > > > >> + } in, out; > >> +}; > >> + > >> +int qcom_tee_object_do_invoke(struct qcom_tee_object_invoke_ctx *oic, > >> + struct qcom_tee_object *object, unsigned long op, struct qcom_tee_arg u[], int *result); > > > > What's the difference between a result that gets returned by the > > function and the result that gets retuned via the pointer? > > The function result, is local to kernel, for instance memory allocation failure, > or failure to issue the smc call. The result in pointer, is the remote result, > for instance return value from TA, or the TEE itself. > > I'll use better name, e.g. 'remote_result'? See how this is handled by other parties. For example, PSCI. If you have a standard set of return codes, translate them to -ESOMETHING in your framework and let everybody else see only the standard errors. -- With best wishes Dmitry
