diff options
Diffstat (limited to 'drivers/tee/optee/ffa_abi.c')
| -rw-r--r-- | drivers/tee/optee/ffa_abi.c | 38 |
1 files changed, 28 insertions, 10 deletions
diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c index c9b3b2cfb2b2..7ab31740cff8 100644 --- a/drivers/tee/optee/ffa_abi.c +++ b/drivers/tee/optee/ffa_abi.c @@ -601,6 +601,7 @@ done: * optee_ffa_do_call_with_arg() - Do a FF-A call to enter OP-TEE in secure world * @ctx: calling context * @shm: shared memory holding the message to pass to secure world + * @offs: offset of the message in @shm * * Does a FF-A call to OP-TEE in secure world and handles eventual resulting * Remote Procedure Calls (RPC) from OP-TEE. @@ -609,24 +610,33 @@ done: */ static int optee_ffa_do_call_with_arg(struct tee_context *ctx, - struct tee_shm *shm) + struct tee_shm *shm, u_int offs) { struct ffa_send_direct_data data = { .data0 = OPTEE_FFA_YIELDING_CALL_WITH_ARG, .data1 = (u32)shm->sec_world_id, .data2 = (u32)(shm->sec_world_id >> 32), - .data3 = shm->offset, + .data3 = offs, }; struct optee_msg_arg *arg; unsigned int rpc_arg_offs; struct optee_msg_arg *rpc_arg; - arg = tee_shm_get_va(shm, 0); + /* + * The shared memory object has to start on a page when passed as + * an argument struct. This is also what the shm pool allocator + * returns, but check this before calling secure world to catch + * eventual errors early in case something changes. + */ + if (shm->offset) + return -EINVAL; + + arg = tee_shm_get_va(shm, offs); if (IS_ERR(arg)) return PTR_ERR(arg); rpc_arg_offs = OPTEE_MSG_GET_ARG_SIZE(arg->num_params); - rpc_arg = tee_shm_get_va(shm, rpc_arg_offs); + rpc_arg = tee_shm_get_va(shm, offs + rpc_arg_offs); if (IS_ERR(rpc_arg)) return PTR_ERR(rpc_arg); @@ -678,7 +688,8 @@ static bool optee_ffa_api_is_compatbile(struct ffa_device *ffa_dev, static bool optee_ffa_exchange_caps(struct ffa_device *ffa_dev, const struct ffa_dev_ops *ops, - unsigned int *rpc_arg_count) + u32 *sec_caps, + unsigned int *rpc_param_count) { struct ffa_send_direct_data data = { OPTEE_FFA_EXCHANGE_CAPABILITIES }; int rc; @@ -693,7 +704,8 @@ static bool optee_ffa_exchange_caps(struct ffa_device *ffa_dev, return false; } - *rpc_arg_count = (u8)data.data1; + *rpc_param_count = (u8)data.data1; + *sec_caps = data.data2; return true; } @@ -759,7 +771,7 @@ static const struct optee_ops optee_ffa_ops = { static void optee_ffa_remove(struct ffa_device *ffa_dev) { - struct optee *optee = ffa_dev->dev.driver_data; + struct optee *optee = ffa_dev_get_drvdata(ffa_dev); optee_remove_common(optee); @@ -772,11 +784,13 @@ static void optee_ffa_remove(struct ffa_device *ffa_dev) static int optee_ffa_probe(struct ffa_device *ffa_dev) { const struct ffa_dev_ops *ffa_ops; - unsigned int rpc_arg_count; + unsigned int rpc_param_count; struct tee_shm_pool *pool; struct tee_device *teedev; struct tee_context *ctx; + u32 arg_cache_flags = 0; struct optee *optee; + u32 sec_caps; int rc; ffa_ops = ffa_dev_ops_get(ffa_dev); @@ -788,8 +802,11 @@ static int optee_ffa_probe(struct ffa_device *ffa_dev) if (!optee_ffa_api_is_compatbile(ffa_dev, ffa_ops)) return -EINVAL; - if (!optee_ffa_exchange_caps(ffa_dev, ffa_ops, &rpc_arg_count)) + if (!optee_ffa_exchange_caps(ffa_dev, ffa_ops, &sec_caps, + &rpc_param_count)) return -EINVAL; + if (sec_caps & OPTEE_FFA_SEC_CAP_ARG_OFFSET) + arg_cache_flags |= OPTEE_SHM_ARG_SHARED; optee = kzalloc(sizeof(*optee), GFP_KERNEL); if (!optee) @@ -805,7 +822,7 @@ static int optee_ffa_probe(struct ffa_device *ffa_dev) optee->ops = &optee_ffa_ops; optee->ffa.ffa_dev = ffa_dev; optee->ffa.ffa_ops = ffa_ops; - optee->rpc_arg_count = rpc_arg_count; + optee->rpc_param_count = rpc_param_count; teedev = tee_device_alloc(&optee_ffa_clnt_desc, NULL, optee->pool, optee); @@ -838,6 +855,7 @@ static int optee_ffa_probe(struct ffa_device *ffa_dev) mutex_init(&optee->call_queue.mutex); INIT_LIST_HEAD(&optee->call_queue.waiters); optee_supp_init(&optee->supp); + optee_shm_arg_cache_init(optee, arg_cache_flags); ffa_dev_set_drvdata(ffa_dev, optee); ctx = teedev_open(optee->teedev); if (IS_ERR(ctx)) { |