user/sven/linux.git/include/linux/tee_drv.h, branch v6.9.4

tee: make tee_bus_type const

2024-03-04T16:25:09Z

Since commit d492cc2573a0 ("driver core: device.h: make struct bus_type a const *"), the driver core can properly handle constant struct bus_type, move the tee_bus_type variable to be a constant structure as well, placing it into read-only memory which can not be modified at runtime. Cc: Greg Kroah-Hartman Suggested-by: Greg Kroah-Hartman Signed-off-by: Ricardo B. Marliere Reviewed-by: Sumit Garg Reviewed-by: Greg Kroah-Hartman Signed-off-by: Jens Wiklander Signed-off-by: Arnd Bergmann

tee: system session

2023-11-17T14:48:03Z

Adds kernel client API function tee_client_system_session() for a client to request a system service entry in TEE context. This feature is needed to prevent a system deadlock when several TEE client applications invoke TEE, consuming all TEE thread contexts available in the secure world. The deadlock can happen in the OP-TEE driver for example if all these TEE threads issue an RPC call from TEE to Linux OS to access an eMMC RPMB partition (TEE secure storage) which device clock or regulator controller is accessed through an OP-TEE SCMI services. In that case, Linux SCMI driver must reach OP-TEE SCMI service without waiting until one of the consumed TEE threads is freed. Reviewed-by: Sumit Garg Co-developed-by: Jens Wiklander Signed-off-by: Etienne Carriere Signed-off-by: Jens Wiklander

tee: remove tee_shm_va2pa() and tee_shm_pa2va()

2022-04-26T08:16:48Z

We should not need to index into SHMs based on absolute VA/PA. These functions are not used and this kind of usage should not be encouraged anyway. Remove these functions. Signed-off-by: Andrew Davis Reviewed-by: Sumit Garg Signed-off-by: Jens Wiklander

tee: refactor TEE_SHM_* flags

2022-02-16T06:49:41Z

Removes the redundant TEE_SHM_DMA_BUF, TEE_SHM_EXT_DMA_BUF, TEE_SHM_MAPPED and TEE_SHM_KERNEL_MAPPED flags. TEE_SHM_REGISTER is renamed to TEE_SHM_DYNAMIC in order to better match its usage. Assigns new values to the remaining flags to void gaps. Reviewed-by: Sumit Garg Signed-off-by: Jens Wiklander

tee: replace tee_shm_register()

2022-02-16T06:49:41Z

tee_shm_register() is replaced by the previously introduced functions tee_shm_register_user_buf() and tee_shm_register_kernel_buf(). Since there are not external callers left we can remove tee_shm_register() and refactor the remains. Reviewed-by: Sumit Garg Signed-off-by: Jens Wiklander

tee: add tee_shm_register_{user,kernel}_buf()

2022-02-16T06:49:41Z

Adds the two new functions tee_shm_register_user_buf() and tee_shm_register_kernel_buf() which should be used instead of the old tee_shm_register(). This avoids having the caller supplying the flags parameter which exposes a bit more than desired of the internals of the TEE subsystem. Reviewed-by: Sumit Garg Signed-off-by: Jens Wiklander

tee: replace tee_shm_alloc()

2022-02-16T06:49:41Z

tee_shm_alloc() is replaced by three new functions, tee_shm_alloc_user_buf() - for user mode allocations, replacing passing the flags TEE_SHM_MAPPED | TEE_SHM_DMA_BUF tee_shm_alloc_kernel_buf() - for kernel mode allocations, slightly optimized compared to using the flags TEE_SHM_MAPPED | TEE_SHM_DMA_BUF. tee_shm_alloc_priv_buf() - primarily for TEE driver internal use. This also makes the interface easier to use as we can get rid of the somewhat hard to use flags parameter. The TEE subsystem and the TEE drivers are updated to use the new functions instead. Reviewed-by: Sumit Garg Signed-off-by: Jens Wiklander

tee: simplify shm pool handling

2022-02-16T06:49:41Z

Replaces the shared memory pool based on two pools with a single pool. The alloc() function pointer in struct tee_shm_pool_ops gets another parameter, align. This makes it possible to make less than page aligned allocations from the optional reserved shared memory pool while still making user space allocations page aligned. With in practice unchanged behaviour using only a single pool for bookkeeping. The allocation algorithm in the static OP-TEE shared memory pool is changed from best-fit to first-fit since only the latter supports an alignment parameter. The best-fit algorithm was previously the default choice and not a conscious one. The optee and amdtee drivers are updated as needed to work with this changed pool handling. This also removes OPTEE_SHM_NUM_PRIV_PAGES which becomes obsolete with this change as the private pages can be mixed with the payload pages. The OP-TEE driver changes minimum alignment for argument struct from 8 bytes to 512 bytes. A typical OP-TEE private shm allocation is 224 bytes (argument struct with 6 parameters, needed for open session). So with an alignment of 512 well waste a bit more than 50%. Before this we had a single page reserved for this so worst case usage compared to that would be 3 pages instead of 1 page. However, this worst case only occurs if there is a high pressure from multiple threads on secure world. All in all this should scale up and down better than fixed boundaries. Reviewed-by: Sumit Garg Signed-off-by: Jens Wiklander

tee: add tee_shm_alloc_user_buf()

2022-02-16T06:49:41Z

Adds a new function tee_shm_alloc_user_buf() for user mode allocations, replacing passing the flags TEE_SHM_MAPPED | TEE_SHM_DMA_BUF to tee_shm_alloc(). Reviewed-by: Sumit Garg Signed-off-by: Jens Wiklander

tee: remove unused tee_shm_pool_alloc_res_mem()

2022-02-16T06:49:41Z

None of the drivers in the TEE subsystem uses tee_shm_pool_alloc_res_mem() so remove the function. Reviewed-by: Sumit Garg Signed-off-by: Jens Wiklander