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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 */