blob: 7bedeaf52c1bd3c3a89128a518f99aa8dd3e3160 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Direct Internal Buffer Sharing
*
* Definitions for the DIBS module
*
* Copyright IBM Corp. 2025
*/
#ifndef _DIBS_H
#define _DIBS_H
/* DIBS - Direct Internal Buffer Sharing - concept
* -----------------------------------------------
* In the case of multiple system sharing the same hardware, dibs fabrics can
* provide dibs devices to these systems. The systems use dibs devices of the
* same fabric to communicate via dmbs (Direct Memory Buffers). Each dmb has
* exactly one owning local dibs device and one remote using dibs device, that
* is authorized to write into this dmb. This access control is provided by the
* dibs fabric.
*
* Because the access to the dmb is based on access to physical memory, it is
* lossless and synchronous. The remote devices can directly access any offset
* of the dmb.
*
* Dibs fabrics, dibs devices and dmbs are identified by tokens and ids.
* Dibs fabric id is unique within the same hardware (with the exception of the
* dibs loopback fabric), dmb token is unique within the same fabric, dibs
* device gids are guaranteed to be unique within the same fabric and
* statistically likely to be globally unique. The exchange of these tokens and
* ids between the systems is not part of the dibs concept.
*
* The dibs layer provides an abstraction between dibs device drivers and dibs
* clients.
*/
/* DIBS client
* -----------
*/
#define MAX_DIBS_CLIENTS 8
struct dibs_client {
/* client name for logging and debugging purposes */
const char *name;
/* client index - provided and used by dibs layer */
u8 id;
};
/* Functions to be called by dibs clients:
*/
/**
* dibs_register_client() - register a client with dibs layer
* @client: this client
*
* Return: zero on success.
*/
int dibs_register_client(struct dibs_client *client);
/**
* dibs_unregister_client() - unregister a client with dibs layer
* @client: this client
*
* Return: zero on success.
*/
int dibs_unregister_client(struct dibs_client *client);
#endif /* _DIBS_H */
|
