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/*
* Google LWIS Fence
*
* Copyright (c) 2022 Google, LLC
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef LWIS_FENCE_H_
#define LWIS_FENCE_H_
#include <linux/hashtable.h>
#include <linux/list.h>
#include "lwis_device.h"
#define LWIS_CLIENTS_HASH_BITS 8
extern bool lwis_fence_debug;
struct lwis_fence {
int fd;
int status;
spinlock_t lock;
/* Top device for printing logs */
struct lwis_device *lwis_top_dev;
/* Status wait queue for waking up userspace */
wait_queue_head_t status_wait_queue;
/* Hash table of transactions that's triggered by this fence */
DECLARE_HASHTABLE(transaction_list, LWIS_CLIENTS_HASH_BITS);
};
struct lwis_fence_trigger_transaction_list {
struct lwis_client *owner;
struct list_head list;
struct hlist_node node;
};
struct lwis_fence_pending_signal {
struct file *fp;
struct lwis_fence *fence;
int pending_status;
struct list_head node;
};
/*
* lwis_fence_create: Create a new lwis_fence.
*/
int lwis_fence_create(struct lwis_device *lwis_dev);
int ioctl_lwis_fence_create(struct lwis_device *lwis_dev, int32_t __user *msg);
/*
* lwis_fence_get: Get the lwis_fence associated with the fd.
*/
struct lwis_device *lwis_fence_get(int fd);
/* Creates all fences that do not currently exist */
int lwis_initialize_transaction_fences(struct lwis_client *client,
struct lwis_transaction *transaction);
bool lwis_triggered_by_condition(struct lwis_transaction *transaction);
bool lwis_event_triggered_condition_ready(struct lwis_transaction *transaction,
struct lwis_transaction *weak_transaction,
int64_t event_id, int64_t event_counter);
bool lwis_fence_triggered_condition_ready(struct lwis_transaction *transaction, int fence_status);
/*
* lwis_parse_trigger_condition: Add the transaction to the associated trigger
* fence and event lists.
*/
int lwis_parse_trigger_condition(struct lwis_client *client, struct lwis_transaction *transaction);
/*
* lwis_fence_signal: Signals the lwis_fence with the provided error code.
*/
int lwis_fence_signal(struct lwis_fence *lwis_fence, int status);
/*
* lwis_add_completion_fence: Adds the fence with the given fd as a completion fence to this transaction.
*/
int lwis_add_completion_fence(struct lwis_client *client, struct lwis_transaction *transaction);
/* lwis_fence_pending_signal_create: Creates and returns a lwis_fence_pending_signal list entry */
struct lwis_fence_pending_signal *lwis_fence_pending_signal_create(struct lwis_fence *fence,
struct file *fp);
/*
* lwis_fences_pending_signal_emit: Signal all lwis_fence_pending_signals in the pending_fences list
*/
void lwis_fences_pending_signal_emit(struct lwis_device *lwis_device,
struct list_head *pending_fences);
/*
* lwis_pending_fences_move_all: Move all lwis_fence_pending_signal from the transaction to pending_fences.
*/
void lwis_pending_fences_move_all(struct lwis_device *lwis_device,
struct lwis_transaction *transaction,
struct list_head *pending_fences, int error_code);
#endif /* LWIS_IOCTL_H_ */
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