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667 lines
17 KiB
667 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Copyright (c) 2015, Linaro Limited |
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*/ |
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#include <linux/arm-smccc.h> |
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#include <linux/device.h> |
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#include <linux/err.h> |
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#include <linux/errno.h> |
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#include <linux/mm.h> |
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#include <linux/sched.h> |
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#include <linux/slab.h> |
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#include <linux/tee_drv.h> |
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#include <linux/types.h> |
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#include <linux/uaccess.h> |
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#include "optee_private.h" |
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#include "optee_smc.h" |
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struct optee_call_waiter { |
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struct list_head list_node; |
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struct completion c; |
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}; |
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static void optee_cq_wait_init(struct optee_call_queue *cq, |
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struct optee_call_waiter *w) |
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{ |
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/* |
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* We're preparing to make a call to secure world. In case we can't |
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* allocate a thread in secure world we'll end up waiting in |
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* optee_cq_wait_for_completion(). |
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* |
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* Normally if there's no contention in secure world the call will |
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* complete and we can cleanup directly with optee_cq_wait_final(). |
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*/ |
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mutex_lock(&cq->mutex); |
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|
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/* |
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* We add ourselves to the queue, but we don't wait. This |
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* guarantees that we don't lose a completion if secure world |
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* returns busy and another thread just exited and try to complete |
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* someone. |
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*/ |
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init_completion(&w->c); |
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list_add_tail(&w->list_node, &cq->waiters); |
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mutex_unlock(&cq->mutex); |
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} |
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static void optee_cq_wait_for_completion(struct optee_call_queue *cq, |
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struct optee_call_waiter *w) |
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{ |
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wait_for_completion(&w->c); |
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mutex_lock(&cq->mutex); |
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/* Move to end of list to get out of the way for other waiters */ |
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list_del(&w->list_node); |
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reinit_completion(&w->c); |
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list_add_tail(&w->list_node, &cq->waiters); |
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mutex_unlock(&cq->mutex); |
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} |
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static void optee_cq_complete_one(struct optee_call_queue *cq) |
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{ |
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struct optee_call_waiter *w; |
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list_for_each_entry(w, &cq->waiters, list_node) { |
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if (!completion_done(&w->c)) { |
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complete(&w->c); |
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break; |
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} |
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} |
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} |
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static void optee_cq_wait_final(struct optee_call_queue *cq, |
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struct optee_call_waiter *w) |
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{ |
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/* |
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* We're done with the call to secure world. The thread in secure |
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* world that was used for this call is now available for some |
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* other task to use. |
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*/ |
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mutex_lock(&cq->mutex); |
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/* Get out of the list */ |
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list_del(&w->list_node); |
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/* Wake up one eventual waiting task */ |
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optee_cq_complete_one(cq); |
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/* |
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* If we're completed we've got a completion from another task that |
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* was just done with its call to secure world. Since yet another |
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* thread now is available in secure world wake up another eventual |
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* waiting task. |
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*/ |
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if (completion_done(&w->c)) |
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optee_cq_complete_one(cq); |
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mutex_unlock(&cq->mutex); |
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} |
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/* Requires the filpstate mutex to be held */ |
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static struct optee_session *find_session(struct optee_context_data *ctxdata, |
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u32 session_id) |
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{ |
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struct optee_session *sess; |
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list_for_each_entry(sess, &ctxdata->sess_list, list_node) |
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if (sess->session_id == session_id) |
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return sess; |
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return NULL; |
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} |
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/** |
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* optee_do_call_with_arg() - Do an SMC to OP-TEE in secure world |
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* @ctx: calling context |
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* @parg: physical address of message to pass to secure world |
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* |
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* Does and SMC to OP-TEE in secure world and handles eventual resulting |
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* Remote Procedure Calls (RPC) from OP-TEE. |
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* |
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* Returns return code from secure world, 0 is OK |
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*/ |
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u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg) |
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{ |
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struct optee *optee = tee_get_drvdata(ctx->teedev); |
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struct optee_call_waiter w; |
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struct optee_rpc_param param = { }; |
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struct optee_call_ctx call_ctx = { }; |
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u32 ret; |
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param.a0 = OPTEE_SMC_CALL_WITH_ARG; |
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reg_pair_from_64(¶m.a1, ¶m.a2, parg); |
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/* Initialize waiter */ |
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optee_cq_wait_init(&optee->call_queue, &w); |
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while (true) { |
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struct arm_smccc_res res; |
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optee->invoke_fn(param.a0, param.a1, param.a2, param.a3, |
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param.a4, param.a5, param.a6, param.a7, |
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&res); |
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if (res.a0 == OPTEE_SMC_RETURN_ETHREAD_LIMIT) { |
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/* |
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* Out of threads in secure world, wait for a thread |
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* become available. |
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*/ |
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optee_cq_wait_for_completion(&optee->call_queue, &w); |
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} else if (OPTEE_SMC_RETURN_IS_RPC(res.a0)) { |
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cond_resched(); |
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param.a0 = res.a0; |
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param.a1 = res.a1; |
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param.a2 = res.a2; |
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param.a3 = res.a3; |
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optee_handle_rpc(ctx, ¶m, &call_ctx); |
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} else { |
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ret = res.a0; |
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break; |
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} |
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} |
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optee_rpc_finalize_call(&call_ctx); |
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/* |
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* We're done with our thread in secure world, if there's any |
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* thread waiters wake up one. |
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*/ |
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optee_cq_wait_final(&optee->call_queue, &w); |
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return ret; |
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} |
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static struct tee_shm *get_msg_arg(struct tee_context *ctx, size_t num_params, |
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struct optee_msg_arg **msg_arg, |
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phys_addr_t *msg_parg) |
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{ |
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int rc; |
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struct tee_shm *shm; |
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struct optee_msg_arg *ma; |
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shm = tee_shm_alloc(ctx, OPTEE_MSG_GET_ARG_SIZE(num_params), |
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TEE_SHM_MAPPED); |
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if (IS_ERR(shm)) |
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return shm; |
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ma = tee_shm_get_va(shm, 0); |
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if (IS_ERR(ma)) { |
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rc = PTR_ERR(ma); |
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goto out; |
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} |
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rc = tee_shm_get_pa(shm, 0, msg_parg); |
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if (rc) |
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goto out; |
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memset(ma, 0, OPTEE_MSG_GET_ARG_SIZE(num_params)); |
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ma->num_params = num_params; |
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*msg_arg = ma; |
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out: |
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if (rc) { |
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tee_shm_free(shm); |
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return ERR_PTR(rc); |
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} |
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return shm; |
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} |
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int optee_open_session(struct tee_context *ctx, |
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struct tee_ioctl_open_session_arg *arg, |
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struct tee_param *param) |
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{ |
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struct optee_context_data *ctxdata = ctx->data; |
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int rc; |
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struct tee_shm *shm; |
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struct optee_msg_arg *msg_arg; |
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phys_addr_t msg_parg; |
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struct optee_session *sess = NULL; |
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/* +2 for the meta parameters added below */ |
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shm = get_msg_arg(ctx, arg->num_params + 2, &msg_arg, &msg_parg); |
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if (IS_ERR(shm)) |
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return PTR_ERR(shm); |
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msg_arg->cmd = OPTEE_MSG_CMD_OPEN_SESSION; |
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msg_arg->cancel_id = arg->cancel_id; |
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/* |
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* Initialize and add the meta parameters needed when opening a |
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* session. |
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*/ |
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msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT | |
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OPTEE_MSG_ATTR_META; |
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msg_arg->params[1].attr = OPTEE_MSG_ATTR_TYPE_VALUE_INPUT | |
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OPTEE_MSG_ATTR_META; |
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memcpy(&msg_arg->params[0].u.value, arg->uuid, sizeof(arg->uuid)); |
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msg_arg->params[1].u.value.c = arg->clnt_login; |
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rc = tee_session_calc_client_uuid((uuid_t *)&msg_arg->params[1].u.value, |
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arg->clnt_login, arg->clnt_uuid); |
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if (rc) |
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goto out; |
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rc = optee_to_msg_param(msg_arg->params + 2, arg->num_params, param); |
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if (rc) |
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goto out; |
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sess = kzalloc(sizeof(*sess), GFP_KERNEL); |
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if (!sess) { |
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rc = -ENOMEM; |
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goto out; |
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} |
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if (optee_do_call_with_arg(ctx, msg_parg)) { |
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msg_arg->ret = TEEC_ERROR_COMMUNICATION; |
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msg_arg->ret_origin = TEEC_ORIGIN_COMMS; |
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} |
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if (msg_arg->ret == TEEC_SUCCESS) { |
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/* A new session has been created, add it to the list. */ |
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sess->session_id = msg_arg->session; |
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mutex_lock(&ctxdata->mutex); |
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list_add(&sess->list_node, &ctxdata->sess_list); |
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mutex_unlock(&ctxdata->mutex); |
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} else { |
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kfree(sess); |
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} |
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if (optee_from_msg_param(param, arg->num_params, msg_arg->params + 2)) { |
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arg->ret = TEEC_ERROR_COMMUNICATION; |
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arg->ret_origin = TEEC_ORIGIN_COMMS; |
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/* Close session again to avoid leakage */ |
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optee_close_session(ctx, msg_arg->session); |
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} else { |
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arg->session = msg_arg->session; |
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arg->ret = msg_arg->ret; |
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arg->ret_origin = msg_arg->ret_origin; |
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} |
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out: |
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tee_shm_free(shm); |
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return rc; |
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} |
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int optee_close_session(struct tee_context *ctx, u32 session) |
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{ |
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struct optee_context_data *ctxdata = ctx->data; |
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struct tee_shm *shm; |
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struct optee_msg_arg *msg_arg; |
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phys_addr_t msg_parg; |
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struct optee_session *sess; |
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/* Check that the session is valid and remove it from the list */ |
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mutex_lock(&ctxdata->mutex); |
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sess = find_session(ctxdata, session); |
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if (sess) |
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list_del(&sess->list_node); |
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mutex_unlock(&ctxdata->mutex); |
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if (!sess) |
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return -EINVAL; |
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kfree(sess); |
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shm = get_msg_arg(ctx, 0, &msg_arg, &msg_parg); |
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if (IS_ERR(shm)) |
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return PTR_ERR(shm); |
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msg_arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION; |
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msg_arg->session = session; |
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optee_do_call_with_arg(ctx, msg_parg); |
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tee_shm_free(shm); |
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return 0; |
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} |
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int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg, |
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struct tee_param *param) |
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{ |
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struct optee_context_data *ctxdata = ctx->data; |
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struct tee_shm *shm; |
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struct optee_msg_arg *msg_arg; |
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phys_addr_t msg_parg; |
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struct optee_session *sess; |
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int rc; |
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/* Check that the session is valid */ |
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mutex_lock(&ctxdata->mutex); |
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sess = find_session(ctxdata, arg->session); |
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mutex_unlock(&ctxdata->mutex); |
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if (!sess) |
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return -EINVAL; |
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shm = get_msg_arg(ctx, arg->num_params, &msg_arg, &msg_parg); |
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if (IS_ERR(shm)) |
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return PTR_ERR(shm); |
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msg_arg->cmd = OPTEE_MSG_CMD_INVOKE_COMMAND; |
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msg_arg->func = arg->func; |
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msg_arg->session = arg->session; |
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msg_arg->cancel_id = arg->cancel_id; |
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rc = optee_to_msg_param(msg_arg->params, arg->num_params, param); |
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if (rc) |
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goto out; |
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if (optee_do_call_with_arg(ctx, msg_parg)) { |
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msg_arg->ret = TEEC_ERROR_COMMUNICATION; |
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msg_arg->ret_origin = TEEC_ORIGIN_COMMS; |
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} |
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if (optee_from_msg_param(param, arg->num_params, msg_arg->params)) { |
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msg_arg->ret = TEEC_ERROR_COMMUNICATION; |
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msg_arg->ret_origin = TEEC_ORIGIN_COMMS; |
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} |
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arg->ret = msg_arg->ret; |
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arg->ret_origin = msg_arg->ret_origin; |
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out: |
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tee_shm_free(shm); |
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return rc; |
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} |
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int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session) |
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{ |
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struct optee_context_data *ctxdata = ctx->data; |
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struct tee_shm *shm; |
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struct optee_msg_arg *msg_arg; |
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phys_addr_t msg_parg; |
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struct optee_session *sess; |
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/* Check that the session is valid */ |
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mutex_lock(&ctxdata->mutex); |
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sess = find_session(ctxdata, session); |
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mutex_unlock(&ctxdata->mutex); |
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if (!sess) |
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return -EINVAL; |
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shm = get_msg_arg(ctx, 0, &msg_arg, &msg_parg); |
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if (IS_ERR(shm)) |
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return PTR_ERR(shm); |
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msg_arg->cmd = OPTEE_MSG_CMD_CANCEL; |
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msg_arg->session = session; |
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msg_arg->cancel_id = cancel_id; |
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optee_do_call_with_arg(ctx, msg_parg); |
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tee_shm_free(shm); |
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return 0; |
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} |
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/** |
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* optee_enable_shm_cache() - Enables caching of some shared memory allocation |
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* in OP-TEE |
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* @optee: main service struct |
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*/ |
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void optee_enable_shm_cache(struct optee *optee) |
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{ |
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struct optee_call_waiter w; |
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/* We need to retry until secure world isn't busy. */ |
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optee_cq_wait_init(&optee->call_queue, &w); |
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while (true) { |
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struct arm_smccc_res res; |
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optee->invoke_fn(OPTEE_SMC_ENABLE_SHM_CACHE, 0, 0, 0, 0, 0, 0, |
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0, &res); |
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if (res.a0 == OPTEE_SMC_RETURN_OK) |
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break; |
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optee_cq_wait_for_completion(&optee->call_queue, &w); |
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} |
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optee_cq_wait_final(&optee->call_queue, &w); |
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} |
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/** |
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* optee_disable_shm_cache() - Disables caching of some shared memory allocation |
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* in OP-TEE |
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* @optee: main service struct |
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*/ |
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void optee_disable_shm_cache(struct optee *optee) |
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{ |
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struct optee_call_waiter w; |
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/* We need to retry until secure world isn't busy. */ |
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optee_cq_wait_init(&optee->call_queue, &w); |
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while (true) { |
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union { |
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struct arm_smccc_res smccc; |
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struct optee_smc_disable_shm_cache_result result; |
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} res; |
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optee->invoke_fn(OPTEE_SMC_DISABLE_SHM_CACHE, 0, 0, 0, 0, 0, 0, |
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0, &res.smccc); |
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if (res.result.status == OPTEE_SMC_RETURN_ENOTAVAIL) |
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break; /* All shm's freed */ |
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if (res.result.status == OPTEE_SMC_RETURN_OK) { |
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struct tee_shm *shm; |
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shm = reg_pair_to_ptr(res.result.shm_upper32, |
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res.result.shm_lower32); |
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tee_shm_free(shm); |
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} else { |
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optee_cq_wait_for_completion(&optee->call_queue, &w); |
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} |
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} |
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optee_cq_wait_final(&optee->call_queue, &w); |
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} |
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#define PAGELIST_ENTRIES_PER_PAGE \ |
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((OPTEE_MSG_NONCONTIG_PAGE_SIZE / sizeof(u64)) - 1) |
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/** |
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* optee_fill_pages_list() - write list of user pages to given shared |
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* buffer. |
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* |
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* @dst: page-aligned buffer where list of pages will be stored |
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* @pages: array of pages that represents shared buffer |
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* @num_pages: number of entries in @pages |
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* @page_offset: offset of user buffer from page start |
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* |
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* @dst should be big enough to hold list of user page addresses and |
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* links to the next pages of buffer |
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*/ |
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void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages, |
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size_t page_offset) |
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{ |
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int n = 0; |
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phys_addr_t optee_page; |
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/* |
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* Refer to OPTEE_MSG_ATTR_NONCONTIG description in optee_msg.h |
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* for details. |
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*/ |
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struct { |
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u64 pages_list[PAGELIST_ENTRIES_PER_PAGE]; |
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u64 next_page_data; |
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} *pages_data; |
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/* |
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* Currently OP-TEE uses 4k page size and it does not looks |
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* like this will change in the future. On other hand, there are |
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* no know ARM architectures with page size < 4k. |
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* Thus the next built assert looks redundant. But the following |
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* code heavily relies on this assumption, so it is better be |
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* safe than sorry. |
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*/ |
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BUILD_BUG_ON(PAGE_SIZE < OPTEE_MSG_NONCONTIG_PAGE_SIZE); |
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pages_data = (void *)dst; |
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/* |
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* If linux page is bigger than 4k, and user buffer offset is |
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* larger than 4k/8k/12k/etc this will skip first 4k pages, |
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* because they bear no value data for OP-TEE. |
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*/ |
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optee_page = page_to_phys(*pages) + |
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round_down(page_offset, OPTEE_MSG_NONCONTIG_PAGE_SIZE); |
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while (true) { |
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pages_data->pages_list[n++] = optee_page; |
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if (n == PAGELIST_ENTRIES_PER_PAGE) { |
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pages_data->next_page_data = |
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virt_to_phys(pages_data + 1); |
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pages_data++; |
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n = 0; |
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} |
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optee_page += OPTEE_MSG_NONCONTIG_PAGE_SIZE; |
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if (!(optee_page & ~PAGE_MASK)) { |
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if (!--num_pages) |
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break; |
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pages++; |
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optee_page = page_to_phys(*pages); |
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} |
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} |
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} |
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/* |
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* The final entry in each pagelist page is a pointer to the next |
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* pagelist page. |
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*/ |
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static size_t get_pages_list_size(size_t num_entries) |
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{ |
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int pages = DIV_ROUND_UP(num_entries, PAGELIST_ENTRIES_PER_PAGE); |
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return pages * OPTEE_MSG_NONCONTIG_PAGE_SIZE; |
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} |
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u64 *optee_allocate_pages_list(size_t num_entries) |
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{ |
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return alloc_pages_exact(get_pages_list_size(num_entries), GFP_KERNEL); |
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} |
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void optee_free_pages_list(void *list, size_t num_entries) |
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{ |
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free_pages_exact(list, get_pages_list_size(num_entries)); |
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} |
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|
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static bool is_normal_memory(pgprot_t p) |
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{ |
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#if defined(CONFIG_ARM) |
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return (((pgprot_val(p) & L_PTE_MT_MASK) == L_PTE_MT_WRITEALLOC) || |
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((pgprot_val(p) & L_PTE_MT_MASK) == L_PTE_MT_WRITEBACK)); |
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#elif defined(CONFIG_ARM64) |
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return (pgprot_val(p) & PTE_ATTRINDX_MASK) == PTE_ATTRINDX(MT_NORMAL); |
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#else |
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#error "Unuspported architecture" |
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#endif |
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} |
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static int __check_mem_type(struct vm_area_struct *vma, unsigned long end) |
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{ |
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while (vma && is_normal_memory(vma->vm_page_prot)) { |
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if (vma->vm_end >= end) |
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return 0; |
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vma = vma->vm_next; |
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} |
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return -EINVAL; |
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} |
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|
|
static int check_mem_type(unsigned long start, size_t num_pages) |
|
{ |
|
struct mm_struct *mm = current->mm; |
|
int rc; |
|
|
|
/* |
|
* Allow kernel address to register with OP-TEE as kernel |
|
* pages are configured as normal memory only. |
|
*/ |
|
if (virt_addr_valid(start)) |
|
return 0; |
|
|
|
mmap_read_lock(mm); |
|
rc = __check_mem_type(find_vma(mm, start), |
|
start + num_pages * PAGE_SIZE); |
|
mmap_read_unlock(mm); |
|
|
|
return rc; |
|
} |
|
|
|
int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm, |
|
struct page **pages, size_t num_pages, |
|
unsigned long start) |
|
{ |
|
struct tee_shm *shm_arg = NULL; |
|
struct optee_msg_arg *msg_arg; |
|
u64 *pages_list; |
|
phys_addr_t msg_parg; |
|
int rc; |
|
|
|
if (!num_pages) |
|
return -EINVAL; |
|
|
|
rc = check_mem_type(start, num_pages); |
|
if (rc) |
|
return rc; |
|
|
|
pages_list = optee_allocate_pages_list(num_pages); |
|
if (!pages_list) |
|
return -ENOMEM; |
|
|
|
shm_arg = get_msg_arg(ctx, 1, &msg_arg, &msg_parg); |
|
if (IS_ERR(shm_arg)) { |
|
rc = PTR_ERR(shm_arg); |
|
goto out; |
|
} |
|
|
|
optee_fill_pages_list(pages_list, pages, num_pages, |
|
tee_shm_get_page_offset(shm)); |
|
|
|
msg_arg->cmd = OPTEE_MSG_CMD_REGISTER_SHM; |
|
msg_arg->params->attr = OPTEE_MSG_ATTR_TYPE_TMEM_OUTPUT | |
|
OPTEE_MSG_ATTR_NONCONTIG; |
|
msg_arg->params->u.tmem.shm_ref = (unsigned long)shm; |
|
msg_arg->params->u.tmem.size = tee_shm_get_size(shm); |
|
/* |
|
* In the least bits of msg_arg->params->u.tmem.buf_ptr we |
|
* store buffer offset from 4k page, as described in OP-TEE ABI. |
|
*/ |
|
msg_arg->params->u.tmem.buf_ptr = virt_to_phys(pages_list) | |
|
(tee_shm_get_page_offset(shm) & (OPTEE_MSG_NONCONTIG_PAGE_SIZE - 1)); |
|
|
|
if (optee_do_call_with_arg(ctx, msg_parg) || |
|
msg_arg->ret != TEEC_SUCCESS) |
|
rc = -EINVAL; |
|
|
|
tee_shm_free(shm_arg); |
|
out: |
|
optee_free_pages_list(pages_list, num_pages); |
|
return rc; |
|
} |
|
|
|
int optee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm) |
|
{ |
|
struct tee_shm *shm_arg; |
|
struct optee_msg_arg *msg_arg; |
|
phys_addr_t msg_parg; |
|
int rc = 0; |
|
|
|
shm_arg = get_msg_arg(ctx, 1, &msg_arg, &msg_parg); |
|
if (IS_ERR(shm_arg)) |
|
return PTR_ERR(shm_arg); |
|
|
|
msg_arg->cmd = OPTEE_MSG_CMD_UNREGISTER_SHM; |
|
|
|
msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT; |
|
msg_arg->params[0].u.rmem.shm_ref = (unsigned long)shm; |
|
|
|
if (optee_do_call_with_arg(ctx, msg_parg) || |
|
msg_arg->ret != TEEC_SUCCESS) |
|
rc = -EINVAL; |
|
tee_shm_free(shm_arg); |
|
return rc; |
|
} |
|
|
|
int optee_shm_register_supp(struct tee_context *ctx, struct tee_shm *shm, |
|
struct page **pages, size_t num_pages, |
|
unsigned long start) |
|
{ |
|
/* |
|
* We don't want to register supplicant memory in OP-TEE. |
|
* Instead information about it will be passed in RPC code. |
|
*/ |
|
return check_mem_type(start, num_pages); |
|
} |
|
|
|
int optee_shm_unregister_supp(struct tee_context *ctx, struct tee_shm *shm) |
|
{ |
|
return 0; |
|
}
|
|
|