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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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staging: vchiq: use completions instead of semaphores
It is preferred in the kernel to avoid using semaphores to wait for events, as they are optimised for the opposite situation; where the common case is that they are available and may block only occasionally. FYI see this thread: https://lkml.org/lkml/2008/4/11/323. Also completions are semantically more explicit in this case. Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Acked-by: Stefan Wahren <stefan.wahren@i2se.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
51c0712650
commit
f27e47bc6b
5 changed files with 106 additions and 102 deletions
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@ -44,7 +44,7 @@
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#include <linux/highmem.h>
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#include <linux/pagemap.h>
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#include <linux/bug.h>
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#include <linux/semaphore.h>
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#include <linux/completion.h>
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#include <linux/list.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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@ -121,9 +121,9 @@ typedef struct user_service_struct {
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int message_available_pos;
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int msg_insert;
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int msg_remove;
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struct semaphore insert_event;
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struct semaphore remove_event;
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struct semaphore close_event;
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struct completion insert_event;
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struct completion remove_event;
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struct completion close_event;
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VCHIQ_HEADER_T * msg_queue[MSG_QUEUE_SIZE];
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} USER_SERVICE_T;
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@ -138,8 +138,8 @@ struct vchiq_instance_struct {
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VCHIQ_COMPLETION_DATA_T completions[MAX_COMPLETIONS];
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int completion_insert;
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int completion_remove;
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struct semaphore insert_event;
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struct semaphore remove_event;
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struct completion insert_event;
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struct completion remove_event;
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struct mutex completion_mutex;
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int connected;
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@ -562,7 +562,8 @@ add_completion(VCHIQ_INSTANCE_T instance, VCHIQ_REASON_T reason,
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vchiq_log_trace(vchiq_arm_log_level,
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"%s - completion queue full", __func__);
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DEBUG_COUNT(COMPLETION_QUEUE_FULL_COUNT);
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if (down_interruptible(&instance->remove_event) != 0) {
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if (wait_for_completion_interruptible(
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&instance->remove_event)) {
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vchiq_log_info(vchiq_arm_log_level,
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"service_callback interrupted");
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return VCHIQ_RETRY;
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@ -600,7 +601,7 @@ add_completion(VCHIQ_INSTANCE_T instance, VCHIQ_REASON_T reason,
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insert++;
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instance->completion_insert = insert;
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up(&instance->insert_event);
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complete(&instance->insert_event);
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return VCHIQ_SUCCESS;
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}
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@ -673,7 +674,8 @@ service_callback(VCHIQ_REASON_T reason, VCHIQ_HEADER_T *header,
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}
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DEBUG_TRACE(SERVICE_CALLBACK_LINE);
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if (down_interruptible(&user_service->remove_event)
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if (wait_for_completion_interruptible(
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&user_service->remove_event)
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!= 0) {
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vchiq_log_info(vchiq_arm_log_level,
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"%s interrupted", __func__);
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@ -705,7 +707,7 @@ service_callback(VCHIQ_REASON_T reason, VCHIQ_HEADER_T *header,
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}
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spin_unlock(&msg_queue_spinlock);
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up(&user_service->insert_event);
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complete(&user_service->insert_event);
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header = NULL;
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}
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@ -745,7 +747,7 @@ static void close_delivered(USER_SERVICE_T *user_service)
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unlock_service(user_service->service);
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/* Wake the user-thread blocked in close_ or remove_service */
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up(&user_service->close_event);
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complete(&user_service->close_event);
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user_service->close_pending = 0;
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}
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@ -867,7 +869,7 @@ vchiq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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if (status == VCHIQ_SUCCESS) {
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/* Wake the completion thread and ask it to exit */
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instance->closing = 1;
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up(&instance->insert_event);
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complete(&instance->insert_event);
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}
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break;
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@ -948,9 +950,9 @@ vchiq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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instance->completion_remove - 1;
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user_service->msg_insert = 0;
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user_service->msg_remove = 0;
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sema_init(&user_service->insert_event, 0);
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sema_init(&user_service->remove_event, 0);
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sema_init(&user_service->close_event, 0);
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init_completion(&user_service->insert_event);
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init_completion(&user_service->remove_event);
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init_completion(&user_service->close_event);
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if (args.is_open) {
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status = vchiq_open_service_internal
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@ -1007,7 +1009,8 @@ vchiq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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has been closed until the client library calls the
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CLOSE_DELIVERED ioctl, signalling close_event. */
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if (user_service->close_pending &&
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down_interruptible(&user_service->close_event))
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wait_for_completion_interruptible(
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&user_service->close_event))
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status = VCHIQ_RETRY;
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break;
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}
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@ -1182,7 +1185,8 @@ vchiq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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DEBUG_TRACE(AWAIT_COMPLETION_LINE);
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mutex_unlock(&instance->completion_mutex);
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rc = down_interruptible(&instance->insert_event);
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rc = wait_for_completion_interruptible(
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&instance->insert_event);
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mutex_lock(&instance->completion_mutex);
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if (rc != 0) {
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DEBUG_TRACE(AWAIT_COMPLETION_LINE);
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@ -1310,7 +1314,7 @@ vchiq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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}
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if (ret != 0)
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up(&instance->remove_event);
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complete(&instance->remove_event);
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mutex_unlock(&instance->completion_mutex);
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DEBUG_TRACE(AWAIT_COMPLETION_LINE);
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} break;
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@ -1350,8 +1354,8 @@ vchiq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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do {
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spin_unlock(&msg_queue_spinlock);
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DEBUG_TRACE(DEQUEUE_MESSAGE_LINE);
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if (down_interruptible(
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&user_service->insert_event) != 0) {
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if (wait_for_completion_interruptible(
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&user_service->insert_event)) {
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vchiq_log_info(vchiq_arm_log_level,
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"DEQUEUE_MESSAGE interrupted");
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ret = -EINTR;
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@ -1373,7 +1377,7 @@ vchiq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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user_service->msg_remove++;
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spin_unlock(&msg_queue_spinlock);
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up(&user_service->remove_event);
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complete(&user_service->remove_event);
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if (header == NULL)
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ret = -ENOTCONN;
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else if (header->size <= args.bufsize) {
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@ -1979,8 +1983,8 @@ vchiq_open(struct inode *inode, struct file *file)
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vchiq_debugfs_add_instance(instance);
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sema_init(&instance->insert_event, 0);
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sema_init(&instance->remove_event, 0);
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init_completion(&instance->insert_event);
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init_completion(&instance->remove_event);
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mutex_init(&instance->completion_mutex);
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mutex_init(&instance->bulk_waiter_list_mutex);
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INIT_LIST_HEAD(&instance->bulk_waiter_list);
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@ -2033,12 +2037,12 @@ vchiq_release(struct inode *inode, struct file *file)
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/* Wake the completion thread and ask it to exit */
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instance->closing = 1;
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up(&instance->insert_event);
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complete(&instance->insert_event);
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mutex_unlock(&instance->completion_mutex);
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/* Wake the slot handler if the completion queue is full. */
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up(&instance->remove_event);
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complete(&instance->remove_event);
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/* Mark all services for termination... */
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i = 0;
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@ -2047,7 +2051,7 @@ vchiq_release(struct inode *inode, struct file *file)
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USER_SERVICE_T *user_service = service->base.userdata;
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/* Wake the slot handler if the msg queue is full. */
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up(&user_service->remove_event);
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complete(&user_service->remove_event);
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vchiq_terminate_service_internal(service);
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unlock_service(service);
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@ -2059,7 +2063,7 @@ vchiq_release(struct inode *inode, struct file *file)
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!= NULL) {
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USER_SERVICE_T *user_service = service->base.userdata;
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down(&service->remove_event);
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wait_for_completion(&service->remove_event);
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BUG_ON(service->srvstate != VCHIQ_SRVSTATE_FREE);
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@ -2103,7 +2107,7 @@ vchiq_release(struct inode *inode, struct file *file)
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/* Wake any blocked user-thread */
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if (instance->use_close_delivered)
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up(&user_service->close_event);
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complete(&user_service->close_event);
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unlock_service(service);
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}
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instance->completion_remove++;
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@ -376,7 +376,7 @@ mark_service_closing_internal(VCHIQ_SERVICE_T *service, int sh_thread)
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/* Unblock any sending thread. */
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service_quota = &state->service_quotas[service->localport];
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up(&service_quota->quota_event);
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complete(&service_quota->quota_event);
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}
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static void
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@ -432,9 +432,9 @@ remote_event_wait(VCHIQ_STATE_T *state, REMOTE_EVENT_T *event)
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event->armed = 1;
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dsb(sy);
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if (!event->fired) {
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if (down_interruptible(
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(struct semaphore *)
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((char *)state + event->event)) != 0) {
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if (wait_for_completion_interruptible(
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(struct completion *)
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((char *)state + event->event))) {
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event->armed = 0;
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return 0;
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}
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@ -451,7 +451,7 @@ static inline void
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remote_event_signal_local(VCHIQ_STATE_T *state, REMOTE_EVENT_T *event)
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{
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event->armed = 0;
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up((struct semaphore *)((char *)state + event->event));
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complete((struct completion *)((char *)state + event->event));
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}
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static inline void
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@ -581,7 +581,7 @@ reserve_space(VCHIQ_STATE_T *state, size_t space, int is_blocking)
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/* If there is no free slot... */
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if (down_trylock(&state->slot_available_event) != 0) {
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if (!try_wait_for_completion(&state->slot_available_event)) {
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/* ...wait for one. */
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VCHIQ_STATS_INC(state, slot_stalls);
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@ -592,13 +592,13 @@ reserve_space(VCHIQ_STATE_T *state, size_t space, int is_blocking)
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remote_event_signal(&state->remote->trigger);
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if (!is_blocking ||
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(down_interruptible(
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&state->slot_available_event) != 0))
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(wait_for_completion_interruptible(
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&state->slot_available_event)))
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return NULL; /* No space available */
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}
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if (tx_pos == (state->slot_queue_available * VCHIQ_SLOT_SIZE)) {
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up(&state->slot_available_event);
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complete(&state->slot_available_event);
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pr_warn("%s: invalid tx_pos: %d\n", __func__, tx_pos);
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return NULL;
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}
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@ -678,7 +678,7 @@ process_free_queue(VCHIQ_STATE_T *state, BITSET_T *service_found, size_t length)
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/* Signal the service that it
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** has dropped below its quota
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*/
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up(&service_quota->quota_event);
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complete(&service_quota->quota_event);
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else if (count == 0) {
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vchiq_log_error(vchiq_core_log_level,
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"service %d message_use_count=%d (header %pK, msgid %x, header->msgid %x, header->size %x)",
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@ -703,7 +703,7 @@ process_free_queue(VCHIQ_STATE_T *state, BITSET_T *service_found, size_t length)
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/* Signal the service in case
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** it has dropped below its
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** quota */
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up(&service_quota->quota_event);
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complete(&service_quota->quota_event);
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vchiq_log_trace(
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vchiq_core_log_level,
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"%d: pfq:%d %x@%pK - slot_use->%d",
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@ -744,7 +744,7 @@ process_free_queue(VCHIQ_STATE_T *state, BITSET_T *service_found, size_t length)
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count - 1;
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spin_unlock("a_spinlock);
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if (count == state->data_quota)
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up(&state->data_quota_event);
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complete(&state->data_quota_event);
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}
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/*
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@ -754,7 +754,7 @@ process_free_queue(VCHIQ_STATE_T *state, BITSET_T *service_found, size_t length)
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mb();
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state->slot_queue_available = slot_queue_available;
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up(&state->slot_available_event);
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complete(&state->slot_available_event);
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}
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}
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@ -862,8 +862,8 @@ queue_message(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service,
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spin_unlock("a_spinlock);
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mutex_unlock(&state->slot_mutex);
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if (down_interruptible(&state->data_quota_event)
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!= 0)
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if (wait_for_completion_interruptible(
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&state->data_quota_event))
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return VCHIQ_RETRY;
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mutex_lock(&state->slot_mutex);
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@ -873,7 +873,7 @@ queue_message(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service,
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if ((tx_end_index == state->previous_data_index) ||
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(state->data_use_count < state->data_quota)) {
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/* Pass the signal on to other waiters */
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up(&state->data_quota_event);
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complete(&state->data_quota_event);
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break;
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}
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}
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@ -893,8 +893,8 @@ queue_message(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service,
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service_quota->slot_use_count);
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VCHIQ_SERVICE_STATS_INC(service, quota_stalls);
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mutex_unlock(&state->slot_mutex);
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if (down_interruptible(&service_quota->quota_event)
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!= 0)
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if (wait_for_completion_interruptible(
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&service_quota->quota_event))
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return VCHIQ_RETRY;
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if (service->closing)
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return VCHIQ_ERROR;
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@ -1251,7 +1251,7 @@ notify_bulks(VCHIQ_SERVICE_T *service, VCHIQ_BULK_QUEUE_T *queue,
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waiter = bulk->userdata;
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if (waiter) {
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waiter->actual = bulk->actual;
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up(&waiter->event);
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complete(&waiter->event);
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}
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spin_unlock(&bulk_waiter_spinlock);
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} else if (bulk->mode ==
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@ -1274,7 +1274,7 @@ notify_bulks(VCHIQ_SERVICE_T *service, VCHIQ_BULK_QUEUE_T *queue,
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}
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queue->remove++;
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up(&service->bulk_remove_event);
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complete(&service->bulk_remove_event);
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}
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if (!retry_poll)
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status = VCHIQ_SUCCESS;
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@ -1667,7 +1667,7 @@ parse_rx_slots(VCHIQ_STATE_T *state)
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service->remoteport = remoteport;
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vchiq_set_service_state(service,
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VCHIQ_SRVSTATE_OPEN);
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up(&service->remove_event);
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complete(&service->remove_event);
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} else
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vchiq_log_error(vchiq_core_log_level,
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"OPENACK received in state %s",
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@ -1721,7 +1721,7 @@ parse_rx_slots(VCHIQ_STATE_T *state)
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"%d: prs CONNECT@%pK", state->id, header);
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state->version_common = ((VCHIQ_SLOT_ZERO_T *)
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state->slot_data)->version;
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up(&state->connect);
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complete(&state->connect);
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break;
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case VCHIQ_MSG_BULK_RX:
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case VCHIQ_MSG_BULK_TX:
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@ -2055,7 +2055,7 @@ sync_func(void *v)
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vchiq_set_service_state(service,
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VCHIQ_SRVSTATE_OPENSYNC);
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service->sync = 1;
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up(&service->remove_event);
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complete(&service->remove_event);
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}
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release_message_sync(state, header);
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break;
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@ -2194,33 +2194,33 @@ vchiq_init_state(VCHIQ_STATE_T *state, VCHIQ_SLOT_ZERO_T *slot_zero)
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initialize events and mutexes
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*/
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sema_init(&state->connect, 0);
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init_completion(&state->connect);
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mutex_init(&state->mutex);
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sema_init(&state->trigger_event, 0);
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sema_init(&state->recycle_event, 0);
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sema_init(&state->sync_trigger_event, 0);
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sema_init(&state->sync_release_event, 0);
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init_completion(&state->trigger_event);
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init_completion(&state->recycle_event);
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init_completion(&state->sync_trigger_event);
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init_completion(&state->sync_release_event);
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mutex_init(&state->slot_mutex);
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mutex_init(&state->recycle_mutex);
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mutex_init(&state->sync_mutex);
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mutex_init(&state->bulk_transfer_mutex);
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sema_init(&state->slot_available_event, 0);
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sema_init(&state->slot_remove_event, 0);
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sema_init(&state->data_quota_event, 0);
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init_completion(&state->slot_available_event);
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init_completion(&state->slot_remove_event);
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init_completion(&state->data_quota_event);
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state->slot_queue_available = 0;
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for (i = 0; i < VCHIQ_MAX_SERVICES; i++) {
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VCHIQ_SERVICE_QUOTA_T *service_quota =
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&state->service_quotas[i];
|
||||
sema_init(&service_quota->quota_event, 0);
|
||||
init_completion(&service_quota->quota_event);
|
||||
}
|
||||
|
||||
for (i = local->slot_first; i <= local->slot_last; i++) {
|
||||
local->slot_queue[state->slot_queue_available++] = i;
|
||||
up(&state->slot_available_event);
|
||||
complete(&state->slot_available_event);
|
||||
}
|
||||
|
||||
state->default_slot_quota = state->slot_queue_available/2;
|
||||
|
@ -2354,8 +2354,8 @@ vchiq_add_service_internal(VCHIQ_STATE_T *state,
|
|||
service->service_use_count = 0;
|
||||
init_bulk_queue(&service->bulk_tx);
|
||||
init_bulk_queue(&service->bulk_rx);
|
||||
sema_init(&service->remove_event, 0);
|
||||
sema_init(&service->bulk_remove_event, 0);
|
||||
init_completion(&service->remove_event);
|
||||
init_completion(&service->bulk_remove_event);
|
||||
mutex_init(&service->bulk_mutex);
|
||||
memset(&service->stats, 0, sizeof(service->stats));
|
||||
|
||||
|
@ -2470,7 +2470,7 @@ vchiq_open_service_internal(VCHIQ_SERVICE_T *service, int client_id)
|
|||
QMFLAGS_IS_BLOCKING);
|
||||
if (status == VCHIQ_SUCCESS) {
|
||||
/* Wait for the ACK/NAK */
|
||||
if (down_interruptible(&service->remove_event) != 0) {
|
||||
if (wait_for_completion_interruptible(&service->remove_event)) {
|
||||
status = VCHIQ_RETRY;
|
||||
vchiq_release_service_internal(service);
|
||||
} else if ((service->srvstate != VCHIQ_SRVSTATE_OPEN) &&
|
||||
|
@ -2622,7 +2622,7 @@ close_service_complete(VCHIQ_SERVICE_T *service, int failstate)
|
|||
if (is_server)
|
||||
service->closing = 0;
|
||||
|
||||
up(&service->remove_event);
|
||||
complete(&service->remove_event);
|
||||
}
|
||||
} else
|
||||
vchiq_set_service_state(service, failstate);
|
||||
|
@ -2663,7 +2663,7 @@ vchiq_close_service_internal(VCHIQ_SERVICE_T *service, int close_recvd)
|
|||
vchiq_set_service_state(service,
|
||||
VCHIQ_SRVSTATE_LISTENING);
|
||||
}
|
||||
up(&service->remove_event);
|
||||
complete(&service->remove_event);
|
||||
} else
|
||||
vchiq_free_service_internal(service);
|
||||
break;
|
||||
|
@ -2672,7 +2672,7 @@ vchiq_close_service_internal(VCHIQ_SERVICE_T *service, int close_recvd)
|
|||
/* The open was rejected - tell the user */
|
||||
vchiq_set_service_state(service,
|
||||
VCHIQ_SRVSTATE_CLOSEWAIT);
|
||||
up(&service->remove_event);
|
||||
complete(&service->remove_event);
|
||||
} else {
|
||||
/* Shutdown mid-open - let the other side know */
|
||||
status = queue_message(state, service,
|
||||
|
@ -2805,7 +2805,7 @@ vchiq_free_service_internal(VCHIQ_SERVICE_T *service)
|
|||
|
||||
vchiq_set_service_state(service, VCHIQ_SRVSTATE_FREE);
|
||||
|
||||
up(&service->remove_event);
|
||||
complete(&service->remove_event);
|
||||
|
||||
/* Release the initial lock */
|
||||
unlock_service(service);
|
||||
|
@ -2837,11 +2837,11 @@ vchiq_connect_internal(VCHIQ_STATE_T *state, VCHIQ_INSTANCE_T instance)
|
|||
}
|
||||
|
||||
if (state->conn_state == VCHIQ_CONNSTATE_CONNECTING) {
|
||||
if (down_interruptible(&state->connect) != 0)
|
||||
if (wait_for_completion_interruptible(&state->connect))
|
||||
return VCHIQ_RETRY;
|
||||
|
||||
vchiq_set_conn_state(state, VCHIQ_CONNSTATE_CONNECTED);
|
||||
up(&state->connect);
|
||||
complete(&state->connect);
|
||||
}
|
||||
|
||||
return VCHIQ_SUCCESS;
|
||||
|
@ -2936,7 +2936,7 @@ vchiq_close_service(VCHIQ_SERVICE_HANDLE_T handle)
|
|||
}
|
||||
|
||||
while (1) {
|
||||
if (down_interruptible(&service->remove_event) != 0) {
|
||||
if (wait_for_completion_interruptible(&service->remove_event)) {
|
||||
status = VCHIQ_RETRY;
|
||||
break;
|
||||
}
|
||||
|
@ -2997,7 +2997,7 @@ vchiq_remove_service(VCHIQ_SERVICE_HANDLE_T handle)
|
|||
request_poll(service->state, service, VCHIQ_POLL_REMOVE);
|
||||
}
|
||||
while (1) {
|
||||
if (down_interruptible(&service->remove_event) != 0) {
|
||||
if (wait_for_completion_interruptible(&service->remove_event)) {
|
||||
status = VCHIQ_RETRY;
|
||||
break;
|
||||
}
|
||||
|
@ -3054,7 +3054,7 @@ VCHIQ_STATUS_T vchiq_bulk_transfer(VCHIQ_SERVICE_HANDLE_T handle,
|
|||
break;
|
||||
case VCHIQ_BULK_MODE_BLOCKING:
|
||||
bulk_waiter = (struct bulk_waiter *)userdata;
|
||||
sema_init(&bulk_waiter->event, 0);
|
||||
init_completion(&bulk_waiter->event);
|
||||
bulk_waiter->actual = 0;
|
||||
bulk_waiter->bulk = NULL;
|
||||
break;
|
||||
|
@ -3080,8 +3080,8 @@ VCHIQ_STATUS_T vchiq_bulk_transfer(VCHIQ_SERVICE_HANDLE_T handle,
|
|||
VCHIQ_SERVICE_STATS_INC(service, bulk_stalls);
|
||||
do {
|
||||
mutex_unlock(&service->bulk_mutex);
|
||||
if (down_interruptible(&service->bulk_remove_event)
|
||||
!= 0) {
|
||||
if (wait_for_completion_interruptible(
|
||||
&service->bulk_remove_event)) {
|
||||
status = VCHIQ_RETRY;
|
||||
goto error_exit;
|
||||
}
|
||||
|
@ -3157,7 +3157,7 @@ VCHIQ_STATUS_T vchiq_bulk_transfer(VCHIQ_SERVICE_HANDLE_T handle,
|
|||
|
||||
if (bulk_waiter) {
|
||||
bulk_waiter->bulk = bulk;
|
||||
if (down_interruptible(&bulk_waiter->event) != 0)
|
||||
if (wait_for_completion_interruptible(&bulk_waiter->event))
|
||||
status = VCHIQ_RETRY;
|
||||
else if (bulk_waiter->actual == VCHIQ_BULK_ACTUAL_ABORTED)
|
||||
status = VCHIQ_ERROR;
|
||||
|
@ -3326,7 +3326,7 @@ vchiq_set_service_option(VCHIQ_SERVICE_HANDLE_T handle,
|
|||
service_quota->message_use_count)) {
|
||||
/* Signal the service that it may have
|
||||
** dropped below its quota */
|
||||
up(&service_quota->quota_event);
|
||||
complete(&service_quota->quota_event);
|
||||
}
|
||||
status = VCHIQ_SUCCESS;
|
||||
}
|
||||
|
@ -3347,7 +3347,7 @@ vchiq_set_service_option(VCHIQ_SERVICE_HANDLE_T handle,
|
|||
service_quota->slot_use_count))
|
||||
/* Signal the service that it may have
|
||||
** dropped below its quota */
|
||||
up(&service_quota->quota_event);
|
||||
complete(&service_quota->quota_event);
|
||||
status = VCHIQ_SUCCESS;
|
||||
}
|
||||
} break;
|
||||
|
|
|
@ -35,7 +35,7 @@
|
|||
#define VCHIQ_CORE_H
|
||||
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/semaphore.h>
|
||||
#include <linux/completion.h>
|
||||
#include <linux/kthread.h>
|
||||
|
||||
#include "vchiq_cfg.h"
|
||||
|
@ -307,8 +307,8 @@ typedef struct vchiq_service_struct {
|
|||
VCHIQ_BULK_QUEUE_T bulk_tx;
|
||||
VCHIQ_BULK_QUEUE_T bulk_rx;
|
||||
|
||||
struct semaphore remove_event;
|
||||
struct semaphore bulk_remove_event;
|
||||
struct completion remove_event;
|
||||
struct completion bulk_remove_event;
|
||||
struct mutex bulk_mutex;
|
||||
|
||||
struct service_stats_struct {
|
||||
|
@ -337,7 +337,7 @@ typedef struct vchiq_service_quota_struct {
|
|||
unsigned short slot_use_count;
|
||||
unsigned short message_quota;
|
||||
unsigned short message_use_count;
|
||||
struct semaphore quota_event;
|
||||
struct completion quota_event;
|
||||
int previous_tx_index;
|
||||
} VCHIQ_SERVICE_QUOTA_T;
|
||||
|
||||
|
@ -410,7 +410,7 @@ struct vchiq_state_struct {
|
|||
unsigned short default_message_quota;
|
||||
|
||||
/* Event indicating connect message received */
|
||||
struct semaphore connect;
|
||||
struct completion connect;
|
||||
|
||||
/* Mutex protecting services */
|
||||
struct mutex mutex;
|
||||
|
@ -426,16 +426,16 @@ struct vchiq_state_struct {
|
|||
struct task_struct *sync_thread;
|
||||
|
||||
/* Local implementation of the trigger remote event */
|
||||
struct semaphore trigger_event;
|
||||
struct completion trigger_event;
|
||||
|
||||
/* Local implementation of the recycle remote event */
|
||||
struct semaphore recycle_event;
|
||||
struct completion recycle_event;
|
||||
|
||||
/* Local implementation of the sync trigger remote event */
|
||||
struct semaphore sync_trigger_event;
|
||||
struct completion sync_trigger_event;
|
||||
|
||||
/* Local implementation of the sync release remote event */
|
||||
struct semaphore sync_release_event;
|
||||
struct completion sync_release_event;
|
||||
|
||||
char *tx_data;
|
||||
char *rx_data;
|
||||
|
@ -481,12 +481,12 @@ struct vchiq_state_struct {
|
|||
int unused_service;
|
||||
|
||||
/* Signalled when a free slot becomes available. */
|
||||
struct semaphore slot_available_event;
|
||||
struct completion slot_available_event;
|
||||
|
||||
struct semaphore slot_remove_event;
|
||||
struct completion slot_remove_event;
|
||||
|
||||
/* Signalled when a free data slot becomes available. */
|
||||
struct semaphore data_quota_event;
|
||||
struct completion data_quota_event;
|
||||
|
||||
struct state_stats_struct {
|
||||
int slot_stalls;
|
||||
|
@ -505,7 +505,7 @@ struct vchiq_state_struct {
|
|||
|
||||
struct bulk_waiter {
|
||||
VCHIQ_BULK_T *bulk;
|
||||
struct semaphore event;
|
||||
struct completion event;
|
||||
int actual;
|
||||
};
|
||||
|
||||
|
|
|
@ -48,8 +48,8 @@ int vchiu_queue_init(VCHIU_QUEUE_T *queue, int size)
|
|||
queue->write = 0;
|
||||
queue->initialized = 1;
|
||||
|
||||
sema_init(&queue->pop, 0);
|
||||
sema_init(&queue->push, 0);
|
||||
init_completion(&queue->pop);
|
||||
init_completion(&queue->push);
|
||||
|
||||
queue->storage = kcalloc(size, sizeof(VCHIQ_HEADER_T *), GFP_KERNEL);
|
||||
if (!queue->storage) {
|
||||
|
@ -80,7 +80,7 @@ void vchiu_queue_push(VCHIU_QUEUE_T *queue, VCHIQ_HEADER_T *header)
|
|||
return;
|
||||
|
||||
while (queue->write == queue->read + queue->size) {
|
||||
if (down_interruptible(&queue->pop) != 0)
|
||||
if (wait_for_completion_interruptible(&queue->pop))
|
||||
flush_signals(current);
|
||||
}
|
||||
|
||||
|
@ -100,17 +100,17 @@ void vchiu_queue_push(VCHIU_QUEUE_T *queue, VCHIQ_HEADER_T *header)
|
|||
|
||||
queue->write++;
|
||||
|
||||
up(&queue->push);
|
||||
complete(&queue->push);
|
||||
}
|
||||
|
||||
VCHIQ_HEADER_T *vchiu_queue_peek(VCHIU_QUEUE_T *queue)
|
||||
{
|
||||
while (queue->write == queue->read) {
|
||||
if (down_interruptible(&queue->push) != 0)
|
||||
if (wait_for_completion_interruptible(&queue->push))
|
||||
flush_signals(current);
|
||||
}
|
||||
|
||||
up(&queue->push); // We haven't removed anything from the queue.
|
||||
complete(&queue->push); // We haven't removed anything from the queue.
|
||||
|
||||
/*
|
||||
* Read from queue->storage must be visible after read from
|
||||
|
@ -126,7 +126,7 @@ VCHIQ_HEADER_T *vchiu_queue_pop(VCHIU_QUEUE_T *queue)
|
|||
VCHIQ_HEADER_T *header;
|
||||
|
||||
while (queue->write == queue->read) {
|
||||
if (down_interruptible(&queue->push) != 0)
|
||||
if (wait_for_completion_interruptible(&queue->push))
|
||||
flush_signals(current);
|
||||
}
|
||||
|
||||
|
@ -146,7 +146,7 @@ VCHIQ_HEADER_T *vchiu_queue_pop(VCHIU_QUEUE_T *queue)
|
|||
|
||||
queue->read++;
|
||||
|
||||
up(&queue->pop);
|
||||
complete(&queue->pop);
|
||||
|
||||
return header;
|
||||
}
|
||||
|
|
|
@ -35,7 +35,7 @@
|
|||
#define VCHIQ_UTIL_H
|
||||
|
||||
#include <linux/types.h>
|
||||
#include <linux/semaphore.h>
|
||||
#include <linux/completion.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/bitops.h>
|
||||
#include <linux/kthread.h>
|
||||
|
@ -60,8 +60,8 @@ typedef struct {
|
|||
int write;
|
||||
int initialized;
|
||||
|
||||
struct semaphore pop;
|
||||
struct semaphore push;
|
||||
struct completion pop;
|
||||
struct completion push;
|
||||
|
||||
VCHIQ_HEADER_T **storage;
|
||||
} VCHIU_QUEUE_T;
|
||||
|
|
Loading…
Reference in a new issue