Messages in this thread |  | | From | Jens Wiklander <> | Date | Mon, 26 Jul 2021 17:25:23 +0200 | Subject | Re: [PATCH v3 0/5] Add FF-A support in OP-TEE driver |
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Hi Sumit,
On Mon, Jul 26, 2021 at 1:41 PM Sumit Garg <sumit.garg@linaro.org> wrote: > > On Mon, 26 Jul 2021 at 16:25, Sudeep Holla <sudeep.holla@arm.com> wrote: > > > > On Mon, Jul 26, 2021 at 03:59:36PM +0530, Sumit Garg wrote: > > > Hi Jens, > > > > > > On Thu, 22 Jul 2021 at 17:48, Jens Wiklander <jens.wiklander@linaro.org> wrote: > > > > > > > > Hi all, > > > > > > > > This adds supports for the OP-TEE driver to communicate with secure world > > > > using FF-A [1] as transport. > > > > > > > > There is one change to the TEE subsystem with "tee: add sec_world_id to > > > > struct tee_shm" to add support for holding globally unique handle assigned > > > > by the FF-A. This is a field that I believe could useful for the AMDTEE > > > > driver too. > > > > > > > > For communication the OP-TEE message protocol is still used, but with a new > > > > type of memory reference, struct optee_msg_param_fmem, to carry the > > > > information needed by FF-A. The OP-TEE driver is refactored internally with > > > > to sets of callbacks, one for the old SMC based communication and another > > > > set with FF-A as transport. The functions relating to the SMC based ABI > > > > are moved to smc_abi.c while the FF-A based ABI is added in a ffa_abi.c. > > > > > > > > There is also a difference in how the drivers are instantiated. With the > > > > SMC based transport we have a platform driver, module_platform_driver(), > > > > today which we're keeping as is for this configuration. In a FF-A system we > > > > have a FF-A driver, module_ffa_driver(), instead. > > > > > > > > The OP-TEE driver can be compiled for both targets at the same time and > > > > it's up to runtime configuration (device tree or ACPI) to decide how it's > > > > initialized. Note that it's only the old SMC based driver instance that > > > > need device tree or ACPI to initialize. The FF-A based driver relies on the > > > > FF-A bus instead. > > > > > > > > This can be tested QEMU > > > > The repo for SPMC at S-EL1 retrieved by > > > > repo init -u https://github.com/jenswi-linaro/manifest.git -m > > > > qemu_v8.xml -b ffav4_spmc > > > > repo sync > > > > # Then checkout the branch optee_ffa_v3 from > > > > # git://git.linaro.org/people/jens.wiklander/linux-tee.git > > > > # in the linux directory > > > > > > > > To build do: > > > > cd build > > > > make toolchains > > > > make all > > > > > > > > To boot: > > > > make run-only > > > > > > > > Test with xtest, perhaps only with the command "xtest 1004" in case you're > > > > not interested in too many tests. > > > > > > Thanks Jens for sharing instructions to test this feature. So I tried > > > to reproduce using following repo versions: > > > > > > linux-tee, branch: optee_ffa_v3 > > > trusted-firmware-a, branch: ffav4_sel1_spmc > > > build, branch: ffav4_spmc > > > > > > and rest of the repos synced to the latest version as per upstream > > > qemu_v8.xml [1] but I don't see OP-TEE driver being probed during boot > > > [2]. Am I missing something? > > > > > > [1] https://github.com/OP-TEE/manifest/blob/master/qemu_v8.xml > > > [2] > > > Welcome to Buildroot, type root or test to login > > > buildroot login: root > > > # dmesg | grep optee > > > > > > > Do you see ARM FF-A driver initialised successfully ? > > You must see "ARM FF-A Version 1.0 found" or something similar based on > > the actual version supported. > > > > If so, can you check if the partitions are correctly populated by > > the driver using the discover API. > > > > $ grep "" /sys/bus/arm_ffa/devices/*/uuid > > > > If uuid reads zeros, then the devices are populated, just the matching > > driver is not found(due to the workaround for v1.0 spec) > > > > It turns out to be an issue with my build environment, I re-built from > scratch and I could see OP-TEE being probed successfully: > > # dmesg | grep FF-A > [ 0.356382] ARM FF-A: Version 1.0 found > # > # cat /sys/bus/arm_ffa/devices/arm-ffa-8001/uuid > 486178e0-e7f8-11e3-bc5e-0002a5d5c51b > # > # dmesg | grep optee > [ 4.991472] optee: revision 3.14 (49dbb9ef) > [ 5.010110] optee: initialized driver > #
That's good.
> From xtest logs it looks like the pseudo TA interface isn't working for me: > > * regression_1001 Core self tests > - 1001 - skip test, pseudo TA not found > regression_1001 OK > > * regression_1002 PTA parameters > - 1002 - skip test, pseudo TA not found > regression_1002 OK > > * regression_1003 Core internal read/write mutex > - 1003 - skip test, pseudo TA not found > regression_1003 OK
The test PTAs are disabled by default.
> > Similarly, pseudo TAs acting as TEE bus devices doesn't work as well > as I see following devices directory being empty: > > # ls /sys/bus/tee/devices/ > # > > As otherwise with OP-TEE SMC ABI, we should have at least the default > pseudo TA [1] kernel device there. > > So is pseudo TA functional with this new FF-A interface?
Yes, everything is supposed to work.
Cheers, Jens
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