@@ -39,9 +39,29 @@ struct optee_shm_arg_entry {
DECLARE_BITMAP(map, MAX_ARG_COUNT_PER_ENTRY);
};
+void optee_cq_init(struct optee_call_queue *cq, int thread_count)
+{
+ mutex_init(&cq->mutex);
+ INIT_LIST_HEAD(&cq->waiters);
+
+ /*
+ * If cq->total_thread_count is 0 then we're not trying to keep
+ * track of how many free threads we have, instead we're relying on
+ * the secure world to tell us when we're out of thread and have to
+ * wait for another thread to become available.
+ */
+ cq->total_thread_count = thread_count;
+ cq->free_thread_count = thread_count;
+}
+
void optee_cq_wait_init(struct optee_call_queue *cq,
struct optee_call_waiter *w, bool sys_thread)
{
+ unsigned int free_thread_threshold;
+ bool need_wait = false;
+
+ memset(w, 0, sizeof(*w));
+
/*
* We're preparing to make a call to secure world. In case we can't
* allocate a thread in secure world we'll end up waiting in
@@ -60,8 +80,38 @@ void optee_cq_wait_init(struct optee_call_queue *cq,
*/
init_completion(&w->c);
list_add_tail(&w->list_node, &cq->waiters);
+ w->sys_thread = sys_thread;
+
+ if (cq->total_thread_count) {
+ if (sys_thread || !cq->sys_thread_req_count)
+ free_thread_threshold = 0;
+ else
+ free_thread_threshold = 1;
+
+ if (cq->free_thread_count > free_thread_threshold)
+ cq->free_thread_count--;
+ else
+ need_wait = true;
+ }
mutex_unlock(&cq->mutex);
+
+ while (need_wait) {
+ optee_cq_wait_for_completion(cq, w);
+ mutex_lock(&cq->mutex);
+
+ if (sys_thread || !cq->sys_thread_req_count)
+ free_thread_threshold = 0;
+ else
+ free_thread_threshold = 1;
+
+ if (cq->free_thread_count > free_thread_threshold) {
+ cq->free_thread_count--;
+ need_wait = false;
+ }
+
+ mutex_unlock(&cq->mutex);
+ }
}
void optee_cq_wait_for_completion(struct optee_call_queue *cq,
@@ -83,6 +133,14 @@ static void optee_cq_complete_one(struct optee_call_queue *cq)
{
struct optee_call_waiter *w;
+ /* Wake a waiting system session if any, prior to a normal session */
+ list_for_each_entry(w, &cq->waiters, list_node) {
+ if (w->sys_thread && !completion_done(&w->c)) {
+ complete(&w->c);
+ return;
+ }
+ }
+
list_for_each_entry(w, &cq->waiters, list_node) {
if (!completion_done(&w->c)) {
complete(&w->c);
@@ -104,6 +162,8 @@ void optee_cq_wait_final(struct optee_call_queue *cq,
/* Get out of the list */
list_del(&w->list_node);
+ cq->free_thread_count++;
+
/* Wake up one eventual waiting task */
optee_cq_complete_one(cq);
@@ -119,6 +179,28 @@ void optee_cq_wait_final(struct optee_call_queue *cq,
mutex_unlock(&cq->mutex);
}
+/* Count registered system sessions to reserved a system thread or not */
+static bool optee_cq_incr_sys_thread_count(struct optee_call_queue *cq)
+{
+ if (cq->total_thread_count <= 1)
+ return false;
+
+ mutex_lock(&cq->mutex);
+ cq->sys_thread_req_count++;
+ mutex_unlock(&cq->mutex);
+
+ return true;
+}
+
+static void optee_cq_decr_sys_thread_count(struct optee_call_queue *cq)
+{
+ mutex_lock(&cq->mutex);
+ cq->sys_thread_req_count--;
+ /* If there's someone waiting, let it resume */
+ optee_cq_complete_one(cq);
+ mutex_unlock(&cq->mutex);
+}
+
/* Requires the filpstate mutex to be held */
static struct optee_session *find_session(struct optee_context_data *ctxdata,
u32 session_id)
@@ -361,6 +443,27 @@ int optee_open_session(struct tee_context *ctx,
return rc;
}
+int optee_system_session(struct tee_context *ctx, u32 session)
+{
+ struct optee *optee = tee_get_drvdata(ctx->teedev);
+ struct optee_context_data *ctxdata = ctx->data;
+ struct optee_session *sess;
+ int rc = -EINVAL;
+
+ mutex_lock(&ctxdata->mutex);
+
+ sess = find_session(ctxdata, session);
+ if (sess && (sess->use_sys_thread ||
+ optee_cq_incr_sys_thread_count(&optee->call_queue))) {
+ sess->use_sys_thread = true;
+ rc = 0;
+ }
+
+ mutex_unlock(&ctxdata->mutex);
+
+ return rc;
+}
+
int optee_close_session_helper(struct tee_context *ctx, u32 session,
bool system_thread)
{
@@ -380,6 +483,9 @@ int optee_close_session_helper(struct tee_context *ctx, u32 session,
optee_free_msg_arg(ctx, entry, offs);
+ if (system_thread)
+ optee_cq_decr_sys_thread_count(&optee->call_queue);
+
return 0;
}
@@ -853,8 +853,7 @@ static int optee_ffa_probe(struct ffa_device *ffa_dev)
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_cq_init(&optee->call_queue, 0);
optee_supp_init(&optee->supp);
optee_shm_arg_cache_init(optee, arg_cache_flags);
ffa_dev_set_drvdata(ffa_dev, optee);
@@ -40,15 +40,33 @@ typedef void (optee_invoke_fn)(unsigned long, unsigned long, unsigned long,
unsigned long, unsigned long,
struct arm_smccc_res *);
+/*
+ * struct optee_call_waiter - TEE entry may need to wait for a free TEE thread
+ * @list_node Reference in waiters list
+ * @c Waiting completion reference
+ * @sys_thread True if waiter belongs to a system thread
+ */
struct optee_call_waiter {
struct list_head list_node;
struct completion c;
+ bool sys_thread;
};
+/*
+ * struct optee_call_queue - OP-TEE call queue management
+ * @mutex Serializes access to this struct
+ * @waiters List of threads waiting to enter OP-TEE
+ * @total_thread_count Overall number of thread context in OP-TEE or 0
+ * @free_thread_count Number of threads context free in OP-TEE
+ * @sys_thread_req_count Number of registered system thread sessions
+ */
struct optee_call_queue {
/* Serializes access to this struct */
struct mutex mutex;
struct list_head waiters;
+ int total_thread_count;
+ int free_thread_count;
+ int sys_thread_req_count;
};
struct optee_notif {
@@ -252,6 +270,7 @@ int optee_supp_send(struct tee_context *ctx, u32 ret, u32 num_params,
int optee_open_session(struct tee_context *ctx,
struct tee_ioctl_open_session_arg *arg,
struct tee_param *param);
+int optee_system_session(struct tee_context *ctx, u32 session);
int optee_close_session_helper(struct tee_context *ctx, u32 session,
bool system_thread);
int optee_close_session(struct tee_context *ctx, u32 session);
@@ -301,6 +320,7 @@ static inline void optee_to_msg_param_value(struct optee_msg_param *mp,
mp->u.value.c = p->u.value.c;
}
+void optee_cq_init(struct optee_call_queue *cq, int thread_count);
void optee_cq_wait_init(struct optee_call_queue *cq,
struct optee_call_waiter *w, bool sys_thread);
void optee_cq_wait_for_completion(struct optee_call_queue *cq,
@@ -1212,6 +1212,7 @@ static const struct tee_driver_ops optee_clnt_ops = {
.release = optee_release,
.open_session = optee_open_session,
.close_session = optee_close_session,
+ .system_session = optee_system_session,
.invoke_func = optee_invoke_func,
.cancel_req = optee_cancel_req,
.shm_register = optee_shm_register,
@@ -1359,6 +1360,16 @@ static bool optee_msg_exchange_capabilities(optee_invoke_fn *invoke_fn,
return true;
}
+static unsigned int optee_msg_get_thread_count(optee_invoke_fn *invoke_fn)
+{
+ struct arm_smccc_res res;
+
+ invoke_fn(OPTEE_SMC_GET_THREAD_COUNT, 0, 0, 0, 0, 0, 0, 0, &res);
+ if (res.a0)
+ return 0;
+ return res.a1;
+}
+
static struct tee_shm_pool *
optee_config_shm_memremap(optee_invoke_fn *invoke_fn, void **memremaped_shm)
{
@@ -1611,6 +1622,7 @@ static int optee_probe(struct platform_device *pdev)
struct optee *optee = NULL;
void *memremaped_shm = NULL;
unsigned int rpc_param_count;
+ unsigned int thread_count;
struct tee_device *teedev;
struct tee_context *ctx;
u32 max_notif_value;
@@ -1638,6 +1650,7 @@ static int optee_probe(struct platform_device *pdev)
return -EINVAL;
}
+ thread_count = optee_msg_get_thread_count(invoke_fn);
if (!optee_msg_exchange_capabilities(invoke_fn, &sec_caps,
&max_notif_value,
&rpc_param_count)) {
@@ -1727,8 +1740,7 @@ static int optee_probe(struct platform_device *pdev)
if (rc)
goto err_unreg_supp_teedev;
- mutex_init(&optee->call_queue.mutex);
- INIT_LIST_HEAD(&optee->call_queue.waiters);
+ optee_cq_init(&optee->call_queue, thread_count);
optee_supp_init(&optee->supp);
optee->smc.memremaped_shm = memremaped_shm;
optee->pool = pool;