drivers/tee/optee/smc_abi.c:764: warning: Function parameter or member 'rpc_arg' not described in 'optee_handle_rpc'

From: kernel test robot
Date: Fri Oct 06 2023 - 05:07:13 EST

Hi Jens,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: b78b18fb8ee19f7a05f20c3abc865b3bfe182884
commit: ed8faf6c8f8c1f7e9ee88342a915ce5f09ca9736 optee: add OPTEE_SMC_CALL_WITH_RPC_ARG and OPTEE_SMC_CALL_WITH_REGD_ARG
date: 1 year, 6 months ago
config: arm-defconfig (https://download.01.org/0day-ci/archive/20231006/202310061720.uZWZqosO-lkp@xxxxxxxxx/config)
compiler: arm-linux-gnueabi-gcc (GCC) 13.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20231006/202310061720.uZWZqosO-lkp@xxxxxxxxx/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202310061720.uZWZqosO-lkp@xxxxxxxxx/

All warnings (new ones prefixed by >>):

>> drivers/tee/optee/smc_abi.c:764: warning: Function parameter or member 'rpc_arg' not described in 'optee_handle_rpc'


vim +764 drivers/tee/optee/smc_abi.c

c51a564a5b4835 Jens Wiklander 2021-07-21 751
c51a564a5b4835 Jens Wiklander 2021-07-21 752 /**
c51a564a5b4835 Jens Wiklander 2021-07-21 753 * optee_handle_rpc() - handle RPC from secure world
c51a564a5b4835 Jens Wiklander 2021-07-21 754 * @ctx: context doing the RPC
c51a564a5b4835 Jens Wiklander 2021-07-21 755 * @param: value of registers for the RPC
c51a564a5b4835 Jens Wiklander 2021-07-21 756 * @call_ctx: call context. Preserved during one OP-TEE invocation
c51a564a5b4835 Jens Wiklander 2021-07-21 757 *
c51a564a5b4835 Jens Wiklander 2021-07-21 758 * Result of RPC is written back into @param.
c51a564a5b4835 Jens Wiklander 2021-07-21 759 */
c51a564a5b4835 Jens Wiklander 2021-07-21 760 static void optee_handle_rpc(struct tee_context *ctx,
ed8faf6c8f8c1f Jens Wiklander 2021-11-03 761 struct optee_msg_arg *rpc_arg,
c51a564a5b4835 Jens Wiklander 2021-07-21 762 struct optee_rpc_param *param,
c51a564a5b4835 Jens Wiklander 2021-07-21 763 struct optee_call_ctx *call_ctx)
c51a564a5b4835 Jens Wiklander 2021-07-21 @764 {
c51a564a5b4835 Jens Wiklander 2021-07-21 765 struct tee_device *teedev = ctx->teedev;
c51a564a5b4835 Jens Wiklander 2021-07-21 766 struct optee *optee = tee_get_drvdata(teedev);
ed8faf6c8f8c1f Jens Wiklander 2021-11-03 767 struct optee_msg_arg *arg;
c51a564a5b4835 Jens Wiklander 2021-07-21 768 struct tee_shm *shm;
c51a564a5b4835 Jens Wiklander 2021-07-21 769 phys_addr_t pa;
c51a564a5b4835 Jens Wiklander 2021-07-21 770
c51a564a5b4835 Jens Wiklander 2021-07-21 771 switch (OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0)) {
c51a564a5b4835 Jens Wiklander 2021-07-21 772 case OPTEE_SMC_RPC_FUNC_ALLOC:
5d41f1b3e32829 Jens Wiklander 2022-02-04 773 shm = tee_shm_alloc_priv_buf(optee->ctx, param->a1);
c51a564a5b4835 Jens Wiklander 2021-07-21 774 if (!IS_ERR(shm) && !tee_shm_get_pa(shm, 0, &pa)) {
c51a564a5b4835 Jens Wiklander 2021-07-21 775 reg_pair_from_64(&param->a1, &param->a2, pa);
c51a564a5b4835 Jens Wiklander 2021-07-21 776 reg_pair_from_64(&param->a4, &param->a5,
c51a564a5b4835 Jens Wiklander 2021-07-21 777 (unsigned long)shm);
c51a564a5b4835 Jens Wiklander 2021-07-21 778 } else {
c51a564a5b4835 Jens Wiklander 2021-07-21 779 param->a1 = 0;
c51a564a5b4835 Jens Wiklander 2021-07-21 780 param->a2 = 0;
c51a564a5b4835 Jens Wiklander 2021-07-21 781 param->a4 = 0;
c51a564a5b4835 Jens Wiklander 2021-07-21 782 param->a5 = 0;
c51a564a5b4835 Jens Wiklander 2021-07-21 783 }
6add87fdae9bcb Xiaolei Wang 2021-12-06 784 kmemleak_not_leak(shm);
c51a564a5b4835 Jens Wiklander 2021-07-21 785 break;
c51a564a5b4835 Jens Wiklander 2021-07-21 786 case OPTEE_SMC_RPC_FUNC_FREE:
c51a564a5b4835 Jens Wiklander 2021-07-21 787 shm = reg_pair_to_ptr(param->a1, param->a2);
c51a564a5b4835 Jens Wiklander 2021-07-21 788 tee_shm_free(shm);
c51a564a5b4835 Jens Wiklander 2021-07-21 789 break;
c51a564a5b4835 Jens Wiklander 2021-07-21 790 case OPTEE_SMC_RPC_FUNC_FOREIGN_INTR:
c51a564a5b4835 Jens Wiklander 2021-07-21 791 /*
c51a564a5b4835 Jens Wiklander 2021-07-21 792 * A foreign interrupt was raised while secure world was
c51a564a5b4835 Jens Wiklander 2021-07-21 793 * executing, since they are handled in Linux a dummy RPC is
c51a564a5b4835 Jens Wiklander 2021-07-21 794 * performed to let Linux take the interrupt through the normal
c51a564a5b4835 Jens Wiklander 2021-07-21 795 * vector.
c51a564a5b4835 Jens Wiklander 2021-07-21 796 */
c51a564a5b4835 Jens Wiklander 2021-07-21 797 break;
c51a564a5b4835 Jens Wiklander 2021-07-21 798 case OPTEE_SMC_RPC_FUNC_CMD:
ed8faf6c8f8c1f Jens Wiklander 2021-11-03 799 if (rpc_arg) {
ed8faf6c8f8c1f Jens Wiklander 2021-11-03 800 arg = rpc_arg;
ed8faf6c8f8c1f Jens Wiklander 2021-11-03 801 } else {
c51a564a5b4835 Jens Wiklander 2021-07-21 802 shm = reg_pair_to_ptr(param->a1, param->a2);
ed8faf6c8f8c1f Jens Wiklander 2021-11-03 803 arg = tee_shm_get_va(shm, 0);
ed8faf6c8f8c1f Jens Wiklander 2021-11-03 804 if (IS_ERR(arg)) {
ed8faf6c8f8c1f Jens Wiklander 2021-11-03 805 pr_err("%s: tee_shm_get_va %p failed\n",
ed8faf6c8f8c1f Jens Wiklander 2021-11-03 806 __func__, shm);
ed8faf6c8f8c1f Jens Wiklander 2021-11-03 807 break;
ed8faf6c8f8c1f Jens Wiklander 2021-11-03 808 }
ed8faf6c8f8c1f Jens Wiklander 2021-11-03 809 }
ed8faf6c8f8c1f Jens Wiklander 2021-11-03 810
ed8faf6c8f8c1f Jens Wiklander 2021-11-03 811 handle_rpc_func_cmd(ctx, optee, arg, call_ctx);
c51a564a5b4835 Jens Wiklander 2021-07-21 812 break;
c51a564a5b4835 Jens Wiklander 2021-07-21 813 default:
c51a564a5b4835 Jens Wiklander 2021-07-21 814 pr_warn("Unknown RPC func 0x%x\n",
c51a564a5b4835 Jens Wiklander 2021-07-21 815 (u32)OPTEE_SMC_RETURN_GET_RPC_FUNC(param->a0));
c51a564a5b4835 Jens Wiklander 2021-07-21 816 break;
c51a564a5b4835 Jens Wiklander 2021-07-21 817 }
c51a564a5b4835 Jens Wiklander 2021-07-21 818
c51a564a5b4835 Jens Wiklander 2021-07-21 819 param->a0 = OPTEE_SMC_CALL_RETURN_FROM_RPC;
c51a564a5b4835 Jens Wiklander 2021-07-21 820 }
c51a564a5b4835 Jens Wiklander 2021-07-21 821

:::::: The code at line 764 was first introduced by commit
:::::: c51a564a5b48355f30309b84cdffe3f96d1ae0d3 optee: isolate smc abi

:::::: TO: Jens Wiklander <jens.wiklander@xxxxxxxxxx>
:::::: CC: Jens Wiklander <jens.wiklander@xxxxxxxxxx>

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