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-rw-r--r--drivers/tee/optee/ffa_abi.c922
1 files changed, 922 insertions, 0 deletions
diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c
new file mode 100644
index 0000000000..0828240f27
--- /dev/null
+++ b/drivers/tee/optee/ffa_abi.c
@@ -0,0 +1,922 @@
+// 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);
+ struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
+ const struct ffa_mem_ops *mem_ops = ffa_dev->ops->mem_ops;
+ 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 = mem_ops->memory_share(&args);
+ sg_free_table(&sgt);
+ if (rc)
+ return rc;
+
+ rc = optee_shm_add_ffa_handle(optee, shm, args.g_handle);
+ if (rc) {
+ mem_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);
+ struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
+ const struct ffa_msg_ops *msg_ops = ffa_dev->ops->msg_ops;
+ const struct ffa_mem_ops *mem_ops = ffa_dev->ops->mem_ops;
+ 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 = msg_ops->sync_send_receive(ffa_dev, &data);
+ if (rc)
+ pr_err("Unregister SHM id 0x%llx rc %d\n", global_handle, rc);
+
+ rc = mem_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_mem_ops *mem_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);
+ mem_ops = optee->ffa.ffa_dev->ops->mem_ops;
+ rc = mem_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);
+ struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
+ const struct ffa_msg_ops *msg_ops = ffa_dev->ops->msg_ops;
+ 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 = msg_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_mem_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_ops *ops)
+{
+ const struct ffa_msg_ops *msg_ops = ops->msg_ops;
+ struct ffa_send_direct_data data = { OPTEE_FFA_GET_API_VERSION };
+ int rc;
+
+ msg_ops->mode_32bit_set(ffa_dev);
+
+ rc = msg_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 = msg_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_ops *ops,
+ u32 *sec_caps,
+ unsigned int *rpc_param_count)
+{
+ struct ffa_send_direct_data data = { OPTEE_FFA_EXCHANGE_CAPABILITIES };
+ int rc;
+
+ rc = ops->msg_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_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;
+
+ 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->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);
+}