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// SPDX-License-Identifier: BSD-2-Clause
/*
* Copyright (c) 2015-2016, Linaro Limited
*/
#include <compiler.h>
#include <kernel/spinlock.h>
#include <kernel/thread.h>
#include <kernel/wait_queue.h>
#include <optee_rpc_cmd.h>
#include <string.h>
#include <tee_api_defines.h>
#include <trace.h>
#include <types_ext.h>
static unsigned wq_spin_lock;
void wq_init(struct wait_queue *wq)
{
*wq = (struct wait_queue)WAIT_QUEUE_INITIALIZER;
}
/*
* Note: this function is weak just to make it possible to exclude it from
* the unpaged area.
*/
void __weak __wq_rpc(uint32_t func, int id, const void *sync_obj __maybe_unused,
int owner __maybe_unused, const char *fname,
int lineno __maybe_unused)
{
uint32_t ret;
const char *cmd_str __maybe_unused =
func == OPTEE_RPC_WAIT_QUEUE_SLEEP ? "sleep" : "wake ";
if (fname)
DMSG("%s thread %u %p %d %s:%d", cmd_str, id,
sync_obj, owner, fname, lineno);
else
DMSG("%s thread %u %p %d", cmd_str, id, sync_obj, owner);
struct thread_param params = THREAD_PARAM_VALUE(IN, func, id, 0);
ret = thread_rpc_cmd(OPTEE_RPC_CMD_WAIT_QUEUE, 1, ¶ms);
if (ret != TEE_SUCCESS)
DMSG("%s thread %u ret 0x%x", cmd_str, id, ret);
}
static void slist_add_tail(struct wait_queue *wq, struct wait_queue_elem *wqe)
{
struct wait_queue_elem *wqe_iter;
/* Add elem to end of wait queue */
wqe_iter = SLIST_FIRST(wq);
if (wqe_iter) {
while (SLIST_NEXT(wqe_iter, link))
wqe_iter = SLIST_NEXT(wqe_iter, link);
SLIST_INSERT_AFTER(wqe_iter, wqe, link);
} else
SLIST_INSERT_HEAD(wq, wqe, link);
}
void wq_wait_init_condvar(struct wait_queue *wq, struct wait_queue_elem *wqe,
struct condvar *cv, bool wait_read)
{
uint32_t old_itr_status;
wqe->handle = thread_get_id();
wqe->done = false;
wqe->wait_read = wait_read;
wqe->cv = cv;
old_itr_status = cpu_spin_lock_xsave(&wq_spin_lock);
slist_add_tail(wq, wqe);
cpu_spin_unlock_xrestore(&wq_spin_lock, old_itr_status);
}
void wq_wait_final(struct wait_queue *wq, struct wait_queue_elem *wqe,
const void *sync_obj, int owner, const char *fname,
int lineno)
{
uint32_t old_itr_status;
unsigned done;
do {
__wq_rpc(OPTEE_RPC_WAIT_QUEUE_SLEEP, wqe->handle,
sync_obj, owner, fname, lineno);
old_itr_status = cpu_spin_lock_xsave(&wq_spin_lock);
done = wqe->done;
if (done)
SLIST_REMOVE(wq, wqe, wait_queue_elem, link);
cpu_spin_unlock_xrestore(&wq_spin_lock, old_itr_status);
} while (!done);
}
void wq_wake_next(struct wait_queue *wq, const void *sync_obj,
const char *fname, int lineno)
{
uint32_t old_itr_status;
struct wait_queue_elem *wqe;
int handle = -1;
bool do_wakeup = false;
bool wake_type_assigned = false;
bool wake_read = false; /* avoid gcc warning */
/*
* If next type is wait_read wakeup all wqe with wait_read true.
* If next type isn't wait_read wakeup only the first wqe which isn't
* done.
*/
while (true) {
old_itr_status = cpu_spin_lock_xsave(&wq_spin_lock);
SLIST_FOREACH(wqe, wq, link) {
if (wqe->cv)
continue;
if (wqe->done)
continue;
if (!wake_type_assigned) {
wake_read = wqe->wait_read;
wake_type_assigned = true;
}
if (wqe->wait_read != wake_read)
continue;
wqe->done = true;
handle = wqe->handle;
do_wakeup = true;
break;
}
cpu_spin_unlock_xrestore(&wq_spin_lock, old_itr_status);
if (do_wakeup)
__wq_rpc(OPTEE_RPC_WAIT_QUEUE_WAKEUP, handle,
sync_obj, MUTEX_OWNER_ID_MUTEX_UNLOCK,
fname, lineno);
if (!do_wakeup || !wake_read)
break;
do_wakeup = false;
}
}
void wq_promote_condvar(struct wait_queue *wq, struct condvar *cv,
bool only_one, const void *sync_obj __unused,
const char *fname, int lineno __maybe_unused)
{
uint32_t old_itr_status;
struct wait_queue_elem *wqe;
if (!cv)
return;
old_itr_status = cpu_spin_lock_xsave(&wq_spin_lock);
/*
* Find condvar waiter(s) and promote each to an active waiter.
* This is a bit unfair to eventual other active waiters as a
* condvar waiter is added the the queue when waiting for the
* condvar.
*/
SLIST_FOREACH(wqe, wq, link) {
if (wqe->cv == cv) {
if (fname)
FMSG("promote thread %u %p %s:%d",
wqe->handle, (void *)cv->m, fname, lineno);
else
FMSG("promote thread %u %p",
wqe->handle, (void *)cv->m);
wqe->cv = NULL;
if (only_one)
break;
}
}
cpu_spin_unlock_xrestore(&wq_spin_lock, old_itr_status);
}
bool wq_have_condvar(struct wait_queue *wq, struct condvar *cv)
{
uint32_t old_itr_status;
struct wait_queue_elem *wqe;
bool rc = false;
old_itr_status = cpu_spin_lock_xsave(&wq_spin_lock);
SLIST_FOREACH(wqe, wq, link) {
if (wqe->cv == cv) {
rc = true;
break;
}
}
cpu_spin_unlock_xrestore(&wq_spin_lock, old_itr_status);
return rc;
}
bool wq_is_empty(struct wait_queue *wq)
{
uint32_t old_itr_status;
bool ret;
old_itr_status = cpu_spin_lock_xsave(&wq_spin_lock);
ret = SLIST_EMPTY(wq);
cpu_spin_unlock_xrestore(&wq_spin_lock, old_itr_status);
return ret;
}
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