dibs_loopback.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 *  dibs loopback (aka loopback-ism) device structure definitions.
 4 *
 5 *  Copyright (c) 2024, Alibaba Inc.
 6 *
 7 *  Author: Wen Gu <guwen@linux.alibaba.com>
 8 *          Tony Lu <tonylu@linux.alibaba.com>
 9 *
10 */
11
12#ifndef _DIBS_LOOPBACK_H
13#define _DIBS_LOOPBACK_H
14
15#include <linux/dibs.h>
16#include <linux/hashtable.h>
17#include <linux/spinlock.h>
18#include <linux/types.h>
19#include <linux/wait.h>
20
21#if IS_ENABLED(CONFIG_DIBS_LO)
22#define DIBS_LO_DMBS_HASH_BITS	12
23#define DIBS_LO_MAX_DMBS	5000
24
25struct dibs_lo_dmb_node {
26	struct hlist_node list;
27	u64 token;
28	u32 len;
29	u32 sba_idx;
30	void *cpu_addr;
31	dma_addr_t dma_addr;
32	refcount_t refcnt;
33};
34
35struct dibs_lo_dev {
36	struct dibs_dev *dibs;
37	atomic_t dmb_cnt;
38	rwlock_t dmb_ht_lock;
39	DECLARE_BITMAP(sba_idx_mask, DIBS_LO_MAX_DMBS);
40	DECLARE_HASHTABLE(dmb_ht, DIBS_LO_DMBS_HASH_BITS);
41	wait_queue_head_t ldev_release;
42};
43
44int dibs_loopback_init(void);
45void dibs_loopback_exit(void);
46#else
47static inline int dibs_loopback_init(void)
48{
49	return 0;
50}
51
52static inline void dibs_loopback_exit(void)
53{
54}
55#endif
56
57#endif /* _DIBS_LOOPBACK_H */