| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Copyright (c) 2021, Linaro Limited |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/arm_ffa.h> |
| #include <linux/errno.h> |
| #include <linux/scatterlist.h> |
| #include <linux/sched.h> |
| #include <linux/slab.h> |
| #include <linux/string.h> |
| #include <linux/tee_drv.h> |
| #include <linux/types.h> |
| #include "optee_private.h" |
| #include "optee_ffa.h" |
| #include "optee_rpc_cmd.h" |
| |
| /* |
| * This file implement the FF-A ABI used when communicating with secure world |
| * OP-TEE OS via FF-A. |
| * This file is divided into the following sections: |
| * 1. Maintain a hash table for lookup of a global FF-A memory handle |
| * 2. Convert between struct tee_param and struct optee_msg_param |
| * 3. Low level support functions to register shared memory in secure world |
| * 4. Dynamic shared memory pool based on alloc_pages() |
| * 5. Do a normal scheduled call into secure world |
| * 6. Driver initialization. |
| */ |
| |
| /* |
| * 1. Maintain a hash table for lookup of a global FF-A memory handle |
| * |
| * FF-A assigns a global memory handle for each piece shared memory. |
| * This handle is then used when communicating with secure world. |
| * |
| * Main functions are optee_shm_add_ffa_handle() and optee_shm_rem_ffa_handle() |
| */ |
| struct shm_rhash { |
| struct tee_shm *shm; |
| u64 global_id; |
| struct rhash_head linkage; |
| }; |
| |
| static void rh_free_fn(void *ptr, void *arg) |
| { |
| kfree(ptr); |
| } |
| |
| static const struct rhashtable_params shm_rhash_params = { |
| .head_offset = offsetof(struct shm_rhash, linkage), |
| .key_len = sizeof(u64), |
| .key_offset = offsetof(struct shm_rhash, global_id), |
| .automatic_shrinking = true, |
| }; |
| |
| static struct tee_shm *optee_shm_from_ffa_handle(struct optee *optee, |
| u64 global_id) |
| { |
| struct tee_shm *shm = NULL; |
| struct shm_rhash *r; |
| |
| mutex_lock(&optee->ffa.mutex); |
| r = rhashtable_lookup_fast(&optee->ffa.global_ids, &global_id, |
| shm_rhash_params); |
| if (r) |
| shm = r->shm; |
| mutex_unlock(&optee->ffa.mutex); |
| |
| return shm; |
| } |
| |
| static int optee_shm_add_ffa_handle(struct optee *optee, struct tee_shm *shm, |
| u64 global_id) |
| { |
| struct shm_rhash *r; |
| int rc; |
| |
| r = kmalloc(sizeof(*r), GFP_KERNEL); |
| if (!r) |
| return -ENOMEM; |
| r->shm = shm; |
| r->global_id = global_id; |
| |
| mutex_lock(&optee->ffa.mutex); |
| rc = rhashtable_lookup_insert_fast(&optee->ffa.global_ids, &r->linkage, |
| shm_rhash_params); |
| mutex_unlock(&optee->ffa.mutex); |
| |
| if (rc) |
| kfree(r); |
| |
| return rc; |
| } |
| |
| static int optee_shm_rem_ffa_handle(struct optee *optee, u64 global_id) |
| { |
| struct shm_rhash *r; |
| int rc = -ENOENT; |
| |
| mutex_lock(&optee->ffa.mutex); |
| r = rhashtable_lookup_fast(&optee->ffa.global_ids, &global_id, |
| shm_rhash_params); |
| if (r) |
| rc = rhashtable_remove_fast(&optee->ffa.global_ids, |
| &r->linkage, shm_rhash_params); |
| mutex_unlock(&optee->ffa.mutex); |
| |
| if (!rc) |
| kfree(r); |
| |
| return rc; |
| } |
| |
| /* |
| * 2. Convert between struct tee_param and struct optee_msg_param |
| * |
| * optee_ffa_from_msg_param() and optee_ffa_to_msg_param() are the main |
| * functions. |
| */ |
| |
| static void from_msg_param_ffa_mem(struct optee *optee, struct tee_param *p, |
| u32 attr, const struct optee_msg_param *mp) |
| { |
| struct tee_shm *shm = NULL; |
| u64 offs_high = 0; |
| u64 offs_low = 0; |
| |
| p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT + |
| attr - OPTEE_MSG_ATTR_TYPE_FMEM_INPUT; |
| p->u.memref.size = mp->u.fmem.size; |
| |
| if (mp->u.fmem.global_id != OPTEE_MSG_FMEM_INVALID_GLOBAL_ID) |
| shm = optee_shm_from_ffa_handle(optee, mp->u.fmem.global_id); |
| p->u.memref.shm = shm; |
| |
| if (shm) { |
| offs_low = mp->u.fmem.offs_low; |
| offs_high = mp->u.fmem.offs_high; |
| } |
| p->u.memref.shm_offs = offs_low | offs_high << 32; |
| } |
| |
| /** |
| * optee_ffa_from_msg_param() - convert from OPTEE_MSG parameters to |
| * struct tee_param |
| * @optee: main service struct |
| * @params: subsystem internal parameter representation |
| * @num_params: number of elements in the parameter arrays |
| * @msg_params: OPTEE_MSG parameters |
| * |
| * Returns 0 on success or <0 on failure |
| */ |
| static int optee_ffa_from_msg_param(struct optee *optee, |
| struct tee_param *params, size_t num_params, |
| const struct optee_msg_param *msg_params) |
| { |
| size_t n; |
| |
| for (n = 0; n < num_params; n++) { |
| struct tee_param *p = params + n; |
| const struct optee_msg_param *mp = msg_params + n; |
| u32 attr = mp->attr & OPTEE_MSG_ATTR_TYPE_MASK; |
| |
| switch (attr) { |
| case OPTEE_MSG_ATTR_TYPE_NONE: |
| p->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE; |
| memset(&p->u, 0, sizeof(p->u)); |
| break; |
| case OPTEE_MSG_ATTR_TYPE_VALUE_INPUT: |
| case OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT: |
| case OPTEE_MSG_ATTR_TYPE_VALUE_INOUT: |
| optee_from_msg_param_value(p, attr, mp); |
| break; |
| case OPTEE_MSG_ATTR_TYPE_FMEM_INPUT: |
| case OPTEE_MSG_ATTR_TYPE_FMEM_OUTPUT: |
| case OPTEE_MSG_ATTR_TYPE_FMEM_INOUT: |
| from_msg_param_ffa_mem(optee, p, attr, mp); |
| break; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int to_msg_param_ffa_mem(struct optee_msg_param *mp, |
| const struct tee_param *p) |
| { |
| struct tee_shm *shm = p->u.memref.shm; |
| |
| mp->attr = OPTEE_MSG_ATTR_TYPE_FMEM_INPUT + p->attr - |
| TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT; |
| |
| if (shm) { |
| u64 shm_offs = p->u.memref.shm_offs; |
| |
| mp->u.fmem.internal_offs = shm->offset; |
| |
| mp->u.fmem.offs_low = shm_offs; |
| mp->u.fmem.offs_high = shm_offs >> 32; |
| /* Check that the entire offset could be stored. */ |
| if (mp->u.fmem.offs_high != shm_offs >> 32) |
| return -EINVAL; |
| |
| mp->u.fmem.global_id = shm->sec_world_id; |
| } else { |
| memset(&mp->u, 0, sizeof(mp->u)); |
| mp->u.fmem.global_id = OPTEE_MSG_FMEM_INVALID_GLOBAL_ID; |
| } |
| mp->u.fmem.size = p->u.memref.size; |
| |
| return 0; |
| } |
| |
| /** |
| * optee_ffa_to_msg_param() - convert from struct tee_params to OPTEE_MSG |
| * parameters |
| * @optee: main service struct |
| * @msg_params: OPTEE_MSG parameters |
| * @num_params: number of elements in the parameter arrays |
| * @params: subsystem itnernal parameter representation |
| * Returns 0 on success or <0 on failure |
| */ |
| static int optee_ffa_to_msg_param(struct optee *optee, |
| struct optee_msg_param *msg_params, |
| size_t num_params, |
| const struct tee_param *params) |
| { |
| size_t n; |
| |
| for (n = 0; n < num_params; n++) { |
| const struct tee_param *p = params + n; |
| struct optee_msg_param *mp = msg_params + n; |
| |
| switch (p->attr) { |
| case TEE_IOCTL_PARAM_ATTR_TYPE_NONE: |
| mp->attr = TEE_IOCTL_PARAM_ATTR_TYPE_NONE; |
| memset(&mp->u, 0, sizeof(mp->u)); |
| break; |
| case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT: |
| case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT: |
| case TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INOUT: |
| optee_to_msg_param_value(mp, p); |
| break; |
| case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INPUT: |
| case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_OUTPUT: |
| case TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT: |
| if (to_msg_param_ffa_mem(mp, p)) |
| return -EINVAL; |
| break; |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * 3. Low level support functions to register shared memory in secure world |
| * |
| * Functions to register and unregister shared memory both for normal |
| * clients and for tee-supplicant. |
| */ |
| |
| static int optee_ffa_shm_register(struct tee_context *ctx, struct tee_shm *shm, |
| struct page **pages, size_t num_pages, |
| unsigned long start) |
| { |
| struct optee *optee = tee_get_drvdata(ctx->teedev); |
| const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops; |
| struct ffa_device *ffa_dev = optee->ffa.ffa_dev; |
| struct ffa_mem_region_attributes mem_attr = { |
| .receiver = ffa_dev->vm_id, |
| .attrs = FFA_MEM_RW, |
| }; |
| struct ffa_mem_ops_args args = { |
| .use_txbuf = true, |
| .attrs = &mem_attr, |
| .nattrs = 1, |
| }; |
| struct sg_table sgt; |
| int rc; |
| |
| rc = optee_check_mem_type(start, num_pages); |
| if (rc) |
| return rc; |
| |
| rc = sg_alloc_table_from_pages(&sgt, pages, num_pages, 0, |
| num_pages * PAGE_SIZE, GFP_KERNEL); |
| if (rc) |
| return rc; |
| args.sg = sgt.sgl; |
| rc = ffa_ops->memory_share(ffa_dev, &args); |
| sg_free_table(&sgt); |
| if (rc) |
| return rc; |
| |
| rc = optee_shm_add_ffa_handle(optee, shm, args.g_handle); |
| if (rc) { |
| ffa_ops->memory_reclaim(args.g_handle, 0); |
| return rc; |
| } |
| |
| shm->sec_world_id = args.g_handle; |
| |
| return 0; |
| } |
| |
| static int optee_ffa_shm_unregister(struct tee_context *ctx, |
| struct tee_shm *shm) |
| { |
| struct optee *optee = tee_get_drvdata(ctx->teedev); |
| const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops; |
| struct ffa_device *ffa_dev = optee->ffa.ffa_dev; |
| u64 global_handle = shm->sec_world_id; |
| struct ffa_send_direct_data data = { |
| .data0 = OPTEE_FFA_UNREGISTER_SHM, |
| .data1 = (u32)global_handle, |
| .data2 = (u32)(global_handle >> 32) |
| }; |
| int rc; |
| |
| optee_shm_rem_ffa_handle(optee, global_handle); |
| shm->sec_world_id = 0; |
| |
| rc = ffa_ops->sync_send_receive(ffa_dev, &data); |
| if (rc) |
| pr_err("Unregister SHM id 0x%llx rc %d\n", global_handle, rc); |
| |
| rc = ffa_ops->memory_reclaim(global_handle, 0); |
| if (rc) |
| pr_err("mem_reclaim: 0x%llx %d", global_handle, rc); |
| |
| return rc; |
| } |
| |
| static int optee_ffa_shm_unregister_supp(struct tee_context *ctx, |
| struct tee_shm *shm) |
| { |
| struct optee *optee = tee_get_drvdata(ctx->teedev); |
| const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops; |
| u64 global_handle = shm->sec_world_id; |
| int rc; |
| |
| /* |
| * We're skipping the OPTEE_FFA_YIELDING_CALL_UNREGISTER_SHM call |
| * since this is OP-TEE freeing via RPC so it has already retired |
| * this ID. |
| */ |
| |
| optee_shm_rem_ffa_handle(optee, global_handle); |
| rc = ffa_ops->memory_reclaim(global_handle, 0); |
| if (rc) |
| pr_err("mem_reclaim: 0x%llx %d", global_handle, rc); |
| |
| shm->sec_world_id = 0; |
| |
| return rc; |
| } |
| |
| /* |
| * 4. Dynamic shared memory pool based on alloc_pages() |
| * |
| * Implements an OP-TEE specific shared memory pool. |
| * The main function is optee_ffa_shm_pool_alloc_pages(). |
| */ |
| |
| static int pool_ffa_op_alloc(struct tee_shm_pool *pool, |
| struct tee_shm *shm, size_t size, size_t align) |
| { |
| return optee_pool_op_alloc_helper(pool, shm, size, align, |
| optee_ffa_shm_register); |
| } |
| |
| static void pool_ffa_op_free(struct tee_shm_pool *pool, |
| struct tee_shm *shm) |
| { |
| optee_pool_op_free_helper(pool, shm, optee_ffa_shm_unregister); |
| } |
| |
| static void pool_ffa_op_destroy_pool(struct tee_shm_pool *pool) |
| { |
| kfree(pool); |
| } |
| |
| static const struct tee_shm_pool_ops pool_ffa_ops = { |
| .alloc = pool_ffa_op_alloc, |
| .free = pool_ffa_op_free, |
| .destroy_pool = pool_ffa_op_destroy_pool, |
| }; |
| |
| /** |
| * optee_ffa_shm_pool_alloc_pages() - create page-based allocator pool |
| * |
| * This pool is used with OP-TEE over FF-A. In this case command buffers |
| * and such are allocated from kernel's own memory. |
| */ |
| static struct tee_shm_pool *optee_ffa_shm_pool_alloc_pages(void) |
| { |
| struct tee_shm_pool *pool = kzalloc(sizeof(*pool), GFP_KERNEL); |
| |
| if (!pool) |
| return ERR_PTR(-ENOMEM); |
| |
| pool->ops = &pool_ffa_ops; |
| |
| return pool; |
| } |
| |
| /* |
| * 5. Do a normal scheduled call into secure world |
| * |
| * The function optee_ffa_do_call_with_arg() performs a normal scheduled |
| * call into secure world. During this call may normal world request help |
| * from normal world using RPCs, Remote Procedure Calls. This includes |
| * delivery of non-secure interrupts to for instance allow rescheduling of |
| * the current task. |
| */ |
| |
| static void handle_ffa_rpc_func_cmd_shm_alloc(struct tee_context *ctx, |
| struct optee *optee, |
| struct optee_msg_arg *arg) |
| { |
| struct tee_shm *shm; |
| |
| if (arg->num_params != 1 || |
| arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) { |
| arg->ret = TEEC_ERROR_BAD_PARAMETERS; |
| return; |
| } |
| |
| switch (arg->params[0].u.value.a) { |
| case OPTEE_RPC_SHM_TYPE_APPL: |
| shm = optee_rpc_cmd_alloc_suppl(ctx, arg->params[0].u.value.b); |
| break; |
| case OPTEE_RPC_SHM_TYPE_KERNEL: |
| shm = tee_shm_alloc_priv_buf(optee->ctx, |
| arg->params[0].u.value.b); |
| break; |
| default: |
| arg->ret = TEEC_ERROR_BAD_PARAMETERS; |
| return; |
| } |
| |
| if (IS_ERR(shm)) { |
| arg->ret = TEEC_ERROR_OUT_OF_MEMORY; |
| return; |
| } |
| |
| arg->params[0] = (struct optee_msg_param){ |
| .attr = OPTEE_MSG_ATTR_TYPE_FMEM_OUTPUT, |
| .u.fmem.size = tee_shm_get_size(shm), |
| .u.fmem.global_id = shm->sec_world_id, |
| .u.fmem.internal_offs = shm->offset, |
| }; |
| |
| arg->ret = TEEC_SUCCESS; |
| } |
| |
| static void handle_ffa_rpc_func_cmd_shm_free(struct tee_context *ctx, |
| struct optee *optee, |
| struct optee_msg_arg *arg) |
| { |
| struct tee_shm *shm; |
| |
| if (arg->num_params != 1 || |
| arg->params[0].attr != OPTEE_MSG_ATTR_TYPE_VALUE_INPUT) |
| goto err_bad_param; |
| |
| shm = optee_shm_from_ffa_handle(optee, arg->params[0].u.value.b); |
| if (!shm) |
| goto err_bad_param; |
| switch (arg->params[0].u.value.a) { |
| case OPTEE_RPC_SHM_TYPE_APPL: |
| optee_rpc_cmd_free_suppl(ctx, shm); |
| break; |
| case OPTEE_RPC_SHM_TYPE_KERNEL: |
| tee_shm_free(shm); |
| break; |
| default: |
| goto err_bad_param; |
| } |
| arg->ret = TEEC_SUCCESS; |
| return; |
| |
| err_bad_param: |
| arg->ret = TEEC_ERROR_BAD_PARAMETERS; |
| } |
| |
| static void handle_ffa_rpc_func_cmd(struct tee_context *ctx, |
| struct optee *optee, |
| struct optee_msg_arg *arg) |
| { |
| arg->ret_origin = TEEC_ORIGIN_COMMS; |
| switch (arg->cmd) { |
| case OPTEE_RPC_CMD_SHM_ALLOC: |
| handle_ffa_rpc_func_cmd_shm_alloc(ctx, optee, arg); |
| break; |
| case OPTEE_RPC_CMD_SHM_FREE: |
| handle_ffa_rpc_func_cmd_shm_free(ctx, optee, arg); |
| break; |
| default: |
| optee_rpc_cmd(ctx, optee, arg); |
| } |
| } |
| |
| static void optee_handle_ffa_rpc(struct tee_context *ctx, struct optee *optee, |
| u32 cmd, struct optee_msg_arg *arg) |
| { |
| switch (cmd) { |
| case OPTEE_FFA_YIELDING_CALL_RETURN_RPC_CMD: |
| handle_ffa_rpc_func_cmd(ctx, optee, arg); |
| break; |
| case OPTEE_FFA_YIELDING_CALL_RETURN_INTERRUPT: |
| /* Interrupt delivered by now */ |
| break; |
| default: |
| pr_warn("Unknown RPC func 0x%x\n", cmd); |
| break; |
| } |
| } |
| |
| static int optee_ffa_yielding_call(struct tee_context *ctx, |
| struct ffa_send_direct_data *data, |
| struct optee_msg_arg *rpc_arg) |
| { |
| struct optee *optee = tee_get_drvdata(ctx->teedev); |
| const struct ffa_dev_ops *ffa_ops = optee->ffa.ffa_ops; |
| struct ffa_device *ffa_dev = optee->ffa.ffa_dev; |
| struct optee_call_waiter w; |
| u32 cmd = data->data0; |
| u32 w4 = data->data1; |
| u32 w5 = data->data2; |
| u32 w6 = data->data3; |
| int rc; |
| |
| /* Initialize waiter */ |
| optee_cq_wait_init(&optee->call_queue, &w); |
| while (true) { |
| rc = ffa_ops->sync_send_receive(ffa_dev, data); |
| if (rc) |
| goto done; |
| |
| switch ((int)data->data0) { |
| case TEEC_SUCCESS: |
| break; |
| case TEEC_ERROR_BUSY: |
| if (cmd == OPTEE_FFA_YIELDING_CALL_RESUME) { |
| rc = -EIO; |
| goto done; |
| } |
| |
| /* |
| * Out of threads in secure world, wait for a thread |
| * become available. |
| */ |
| optee_cq_wait_for_completion(&optee->call_queue, &w); |
| data->data0 = cmd; |
| data->data1 = w4; |
| data->data2 = w5; |
| data->data3 = w6; |
| continue; |
| default: |
| rc = -EIO; |
| goto done; |
| } |
| |
| if (data->data1 == OPTEE_FFA_YIELDING_CALL_RETURN_DONE) |
| goto done; |
| |
| /* |
| * OP-TEE has returned with a RPC request. |
| * |
| * Note that data->data4 (passed in register w7) is already |
| * filled in by ffa_ops->sync_send_receive() returning |
| * above. |
| */ |
| cond_resched(); |
| optee_handle_ffa_rpc(ctx, optee, data->data1, rpc_arg); |
| cmd = OPTEE_FFA_YIELDING_CALL_RESUME; |
| data->data0 = cmd; |
| data->data1 = 0; |
| data->data2 = 0; |
| data->data3 = 0; |
| } |
| done: |
| /* |
| * We're done with our thread in secure world, if there's any |
| * thread waiters wake up one. |
| */ |
| optee_cq_wait_final(&optee->call_queue, &w); |
| |
| return rc; |
| } |
| |
| /** |
| * 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. |
| * |
| * Returns return code from FF-A, 0 is OK |
| */ |
| |
| static int optee_ffa_do_call_with_arg(struct tee_context *ctx, |
| 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 = offs, |
| }; |
| struct optee_msg_arg *arg; |
| unsigned int rpc_arg_offs; |
| struct optee_msg_arg *rpc_arg; |
| |
| /* |
| * 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, offs + rpc_arg_offs); |
| if (IS_ERR(rpc_arg)) |
| return PTR_ERR(rpc_arg); |
| |
| return optee_ffa_yielding_call(ctx, &data, rpc_arg); |
| } |
| |
| /* |
| * 6. Driver initialization |
| * |
| * During driver inititialization is the OP-TEE Secure Partition is probed |
| * to find out which features it supports so the driver can be initialized |
| * with a matching configuration. |
| */ |
| |
| static bool optee_ffa_api_is_compatbile(struct ffa_device *ffa_dev, |
| const struct ffa_dev_ops *ops) |
| { |
| struct ffa_send_direct_data data = { OPTEE_FFA_GET_API_VERSION }; |
| int rc; |
| |
| ops->mode_32bit_set(ffa_dev); |
| |
| rc = ops->sync_send_receive(ffa_dev, &data); |
| if (rc) { |
| pr_err("Unexpected error %d\n", rc); |
| return false; |
| } |
| if (data.data0 != OPTEE_FFA_VERSION_MAJOR || |
| data.data1 < OPTEE_FFA_VERSION_MINOR) { |
| pr_err("Incompatible OP-TEE API version %lu.%lu", |
| data.data0, data.data1); |
| return false; |
| } |
| |
| data = (struct ffa_send_direct_data){ OPTEE_FFA_GET_OS_VERSION }; |
| rc = ops->sync_send_receive(ffa_dev, &data); |
| if (rc) { |
| pr_err("Unexpected error %d\n", rc); |
| return false; |
| } |
| if (data.data2) |
| pr_info("revision %lu.%lu (%08lx)", |
| data.data0, data.data1, data.data2); |
| else |
| pr_info("revision %lu.%lu", data.data0, data.data1); |
| |
| return true; |
| } |
| |
| static bool optee_ffa_exchange_caps(struct ffa_device *ffa_dev, |
| const struct ffa_dev_ops *ops, |
| u32 *sec_caps, |
| unsigned int *rpc_param_count) |
| { |
| struct ffa_send_direct_data data = { OPTEE_FFA_EXCHANGE_CAPABILITIES }; |
| int rc; |
| |
| rc = ops->sync_send_receive(ffa_dev, &data); |
| if (rc) { |
| pr_err("Unexpected error %d", rc); |
| return false; |
| } |
| if (data.data0) { |
| pr_err("Unexpected exchange error %lu", data.data0); |
| return false; |
| } |
| |
| *rpc_param_count = (u8)data.data1; |
| *sec_caps = data.data2; |
| |
| return true; |
| } |
| |
| static void optee_ffa_get_version(struct tee_device *teedev, |
| struct tee_ioctl_version_data *vers) |
| { |
| struct tee_ioctl_version_data v = { |
| .impl_id = TEE_IMPL_ID_OPTEE, |
| .impl_caps = TEE_OPTEE_CAP_TZ, |
| .gen_caps = TEE_GEN_CAP_GP | TEE_GEN_CAP_REG_MEM | |
| TEE_GEN_CAP_MEMREF_NULL, |
| }; |
| |
| *vers = v; |
| } |
| |
| static int optee_ffa_open(struct tee_context *ctx) |
| { |
| return optee_open(ctx, true); |
| } |
| |
| static const struct tee_driver_ops optee_ffa_clnt_ops = { |
| .get_version = optee_ffa_get_version, |
| .open = optee_ffa_open, |
| .release = optee_release, |
| .open_session = optee_open_session, |
| .close_session = optee_close_session, |
| .invoke_func = optee_invoke_func, |
| .cancel_req = optee_cancel_req, |
| .shm_register = optee_ffa_shm_register, |
| .shm_unregister = optee_ffa_shm_unregister, |
| }; |
| |
| static const struct tee_desc optee_ffa_clnt_desc = { |
| .name = DRIVER_NAME "-ffa-clnt", |
| .ops = &optee_ffa_clnt_ops, |
| .owner = THIS_MODULE, |
| }; |
| |
| static const struct tee_driver_ops optee_ffa_supp_ops = { |
| .get_version = optee_ffa_get_version, |
| .open = optee_ffa_open, |
| .release = optee_release_supp, |
| .supp_recv = optee_supp_recv, |
| .supp_send = optee_supp_send, |
| .shm_register = optee_ffa_shm_register, /* same as for clnt ops */ |
| .shm_unregister = optee_ffa_shm_unregister_supp, |
| }; |
| |
| static const struct tee_desc optee_ffa_supp_desc = { |
| .name = DRIVER_NAME "-ffa-supp", |
| .ops = &optee_ffa_supp_ops, |
| .owner = THIS_MODULE, |
| .flags = TEE_DESC_PRIVILEGED, |
| }; |
| |
| static const struct optee_ops optee_ffa_ops = { |
| .do_call_with_arg = optee_ffa_do_call_with_arg, |
| .to_msg_param = optee_ffa_to_msg_param, |
| .from_msg_param = optee_ffa_from_msg_param, |
| }; |
| |
| static void optee_ffa_remove(struct ffa_device *ffa_dev) |
| { |
| struct optee *optee = ffa_dev_get_drvdata(ffa_dev); |
| |
| optee_remove_common(optee); |
| |
| mutex_destroy(&optee->ffa.mutex); |
| rhashtable_free_and_destroy(&optee->ffa.global_ids, rh_free_fn, NULL); |
| |
| kfree(optee); |
| } |
| |
| static int optee_ffa_probe(struct ffa_device *ffa_dev) |
| { |
| const struct ffa_dev_ops *ffa_ops; |
| 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); |
| if (!ffa_ops) { |
| pr_warn("failed \"method\" init: ffa\n"); |
| return -ENOENT; |
| } |
| |
| if (!optee_ffa_api_is_compatbile(ffa_dev, ffa_ops)) |
| return -EINVAL; |
| |
| 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) |
| return -ENOMEM; |
| |
| pool = optee_ffa_shm_pool_alloc_pages(); |
| if (IS_ERR(pool)) { |
| rc = PTR_ERR(pool); |
| goto err_free_optee; |
| } |
| optee->pool = pool; |
| |
| optee->ops = &optee_ffa_ops; |
| optee->ffa.ffa_dev = ffa_dev; |
| optee->ffa.ffa_ops = ffa_ops; |
| optee->rpc_param_count = rpc_param_count; |
| |
| teedev = tee_device_alloc(&optee_ffa_clnt_desc, NULL, optee->pool, |
| optee); |
| if (IS_ERR(teedev)) { |
| rc = PTR_ERR(teedev); |
| goto err_free_pool; |
| } |
| optee->teedev = teedev; |
| |
| teedev = tee_device_alloc(&optee_ffa_supp_desc, NULL, optee->pool, |
| optee); |
| if (IS_ERR(teedev)) { |
| rc = PTR_ERR(teedev); |
| goto err_unreg_teedev; |
| } |
| optee->supp_teedev = teedev; |
| |
| rc = tee_device_register(optee->teedev); |
| if (rc) |
| goto err_unreg_supp_teedev; |
| |
| rc = tee_device_register(optee->supp_teedev); |
| if (rc) |
| goto err_unreg_supp_teedev; |
| |
| rc = rhashtable_init(&optee->ffa.global_ids, &shm_rhash_params); |
| if (rc) |
| goto err_unreg_supp_teedev; |
| mutex_init(&optee->ffa.mutex); |
| 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)) { |
| rc = PTR_ERR(ctx); |
| goto err_rhashtable_free; |
| } |
| optee->ctx = ctx; |
| rc = optee_notif_init(optee, OPTEE_DEFAULT_MAX_NOTIF_VALUE); |
| if (rc) |
| goto err_close_ctx; |
| |
| rc = optee_enumerate_devices(PTA_CMD_GET_DEVICES); |
| if (rc) |
| goto err_unregister_devices; |
| |
| pr_info("initialized driver\n"); |
| return 0; |
| |
| err_unregister_devices: |
| optee_unregister_devices(); |
| optee_notif_uninit(optee); |
| err_close_ctx: |
| teedev_close_context(ctx); |
| err_rhashtable_free: |
| rhashtable_free_and_destroy(&optee->ffa.global_ids, rh_free_fn, NULL); |
| optee_supp_uninit(&optee->supp); |
| mutex_destroy(&optee->call_queue.mutex); |
| mutex_destroy(&optee->ffa.mutex); |
| err_unreg_supp_teedev: |
| tee_device_unregister(optee->supp_teedev); |
| err_unreg_teedev: |
| tee_device_unregister(optee->teedev); |
| err_free_pool: |
| tee_shm_pool_free(pool); |
| err_free_optee: |
| kfree(optee); |
| return rc; |
| } |
| |
| static const struct ffa_device_id optee_ffa_device_id[] = { |
| /* 486178e0-e7f8-11e3-bc5e0002a5d5c51b */ |
| { UUID_INIT(0x486178e0, 0xe7f8, 0x11e3, |
| 0xbc, 0x5e, 0x00, 0x02, 0xa5, 0xd5, 0xc5, 0x1b) }, |
| {} |
| }; |
| |
| static struct ffa_driver optee_ffa_driver = { |
| .name = "optee", |
| .probe = optee_ffa_probe, |
| .remove = optee_ffa_remove, |
| .id_table = optee_ffa_device_id, |
| }; |
| |
| int optee_ffa_abi_register(void) |
| { |
| if (IS_REACHABLE(CONFIG_ARM_FFA_TRANSPORT)) |
| return ffa_register(&optee_ffa_driver); |
| else |
| return -EOPNOTSUPP; |
| } |
| |
| void optee_ffa_abi_unregister(void) |
| { |
| if (IS_REACHABLE(CONFIG_ARM_FFA_TRANSPORT)) |
| ffa_unregister(&optee_ffa_driver); |
| } |