Book a Demo!
CoCalc Logo Icon
StoreFeaturesDocsShareSupportNewsAboutPoliciesSign UpSign In
torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/drivers/dibs/dibs_loopback.h
29265 views
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 <[email protected]>

8
 *          Tony Lu <[email protected]>

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


25
struct 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


35
struct 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


44
int dibs_loopback_init(void);

45
void dibs_loopback_exit(void);

46
#else

47
static inline int dibs_loopback_init(void)

48
{

49
	return 0;

50
}

51


52
static inline void dibs_loopback_exit(void)

53
{

54
}

55
#endif

56


57
#endif /* _DIBS_LOOPBACK_H */

58


59