How to build sdp environment base on linux 6.6

[wayne110]

I have a question about optee driver on linux 6.6.

I want to use dma-buf to register sharememory to optee,

But I have not found the tee_shm_register_fd in linux 6.6.
853 static long tee_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
854 {
855 >...struct tee_context *ctx = filp->private_data;
856 >...void __user *uarg = (void __user *)arg;
857
858 >...switch (cmd) {
859 >...case TEE_IOC_VERSION:
860 >...>...return tee_ioctl_version(ctx, uarg);
861 >...case TEE_IOC_SHM_ALLOC:
862 >...>...return tee_ioctl_shm_alloc(ctx, uarg);
863 >...case TEE_IOC_SHM_REGISTER:
864 >...>...return tee_ioctl_shm_register(ctx, uarg);
865 >...case TEE_IOC_SHM_REGISTER_FD:
866 >...>...return tee_ioctl_shm_register_fd(ctx, uarg);
867 >...case TEE_IOC_OPEN_SESSION:
868 >...>...return tee_ioctl_open_session(ctx, uarg);
869 >...case TEE_IOC_INVOKE:
870 >...>...return tee_ioctl_invoke(ctx, uarg);
871 >...case TEE_IOC_CANCEL:
872 >...>...return tee_ioctl_cancel(ctx, uarg);
873 >...case TEE_IOC_CLOSE_SESSION:
874 >...>...return tee_ioctl_close_session(ctx, uarg);
875 >...case TEE_IOC_SUPPL_RECV:
876 >...>...return tee_ioctl_supp_recv(ctx, uarg);
877 >...case TEE_IOC_SUPPL_SEND:
878 >...>...return tee_ioctl_supp_send(ctx, uarg);
879 >...default:
880 >...>...return -EINVAL;
881 >...}
882 }

Did linaro use another way to support Secure media path between REE and TEE on the newest linux?

Or whether linaro maintain the shm APIs to use dma-buf in other branches?

[jenswi-linaro]

SDP is not supported (yet?). I ran across this OP-TEE/optee_test#716 though.

[jenswi-linaro]

I guess linaro-swg/linux#118 is the same question.

[jbech-linaro]

Hi, like Jens said, since ION was removed from the Linux kernel, we haven't been able to re-enable SDP. Work has been done (and is ongoing) trying to get that up and running again with dma-buf. You'll find patches on the kernel mailinglist for this. In addition to that we've been a couple of people from Linaro, Google, Arm, Qualcomm etc who have met a couple of times to discuss this. You can find more about that here:

• Meeting notes
• LTF meeting with recording

If you just want to play around with SDP on a somewhat recent OP-TEE setup, then you can try a setup I did a couple of months ago, however, this is based on older patches from NXP, so likely if we ever end up with a getting this supported in kernel, it will likely look a lot different to this setup. But with this, I've re-enabled SDP and SDP test etc in OP-TEE.

mkdir optee-sdp && cd optee-sdp
repo init -u https://github.com/jbech-linaro/manifest.git -m qemu_v8.xml -b nxp-sdp
repo sync -j12
cd build
make toolchains
make -j24 CFG_SECURE_DATA_PATH=y CFG_CORE_ASLR=n CFG_TA_ASLR=n run
When reaching the shell, type: xtest --sdp-basic

[wayne110]

@jenswi-linaro @jbech-linaro Many thanks.
I will get the code and verify it.

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