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
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
/* SPDX-License-Identifier: GPL-2.0 */
/*
* Gasket common interrupt module. Defines functions for enabling
* eventfd-triggered interrupts between a Gasket device and a host process.
*
* Copyright (C) 2018 Google, Inc.
*/
#ifndef __GASKET_INTERRUPT_H__
#define __GASKET_INTERRUPT_H__
#include <linux/eventfd.h>
#include <linux/pci.h>
#include "gasket_core.h"
/* Note that this currently assumes that device interrupts are a dense set,
* numbered from 0 - (num_interrupts - 1). Should this have to change, these
* APIs will have to be updated.
*/
/* Opaque type used to hold interrupt subsystem data. */
struct gasket_interrupt_data;
/*
* Initialize the interrupt module.
* @gasket_dev: The Gasket device structure for the device to be initted.
*/
int gasket_interrupt_init(struct gasket_dev *gasket_dev);
/*
* Clean up a device's interrupt structure.
* @gasket_dev: The Gasket information structure for this device.
*
* Cleans up the device's interrupts and deallocates data.
*/
void gasket_interrupt_cleanup(struct gasket_dev *gasket_dev);
/*
* Clean up and re-initialize the MSI-x subsystem.
* @gasket_dev: The Gasket information structure for this device.
*
* Performs a teardown of the MSI-x subsystem and re-initializes it. Does not
* free the underlying data structures. Returns 0 on success and an error code
* on error.
*/
int gasket_interrupt_reinit(struct gasket_dev *gasket_dev);
/*
* Reset the counts stored in the interrupt subsystem.
* @gasket_dev: The Gasket information structure for this device.
*
* Sets the counts of all interrupts in the subsystem to 0.
*/
int gasket_interrupt_reset_counts(struct gasket_dev *gasket_dev);
/*
* Associates an eventfd with a device interrupt.
* @data: Pointer to device interrupt data.
* @interrupt: The device interrupt to configure.
* @event_fd: The eventfd to associate with the interrupt.
*
* Prepares the host to receive notification of device interrupts by associating
* event_fd with interrupt. Upon receipt of a device interrupt, event_fd will be
* signaled, after successful configuration.
*
* Returns 0 on success, a negative error code otherwise.
*/
int gasket_interrupt_set_eventfd(struct gasket_interrupt_data *interrupt_data,
int interrupt, int event_fd);
/*
* Removes an interrupt-eventfd association.
* @data: Pointer to device interrupt data.
* @interrupt: The device interrupt to de-associate.
*
* Removes any eventfd associated with the specified interrupt, if any.
*/
int gasket_interrupt_clear_eventfd(struct gasket_interrupt_data *interrupt_data,
int interrupt);
/*
* The below functions exist for backwards compatibility.
* No new uses should be written.
*/
/*
* Get the health of the interrupt subsystem.
* @gasket_dev: The Gasket device struct.
*
* Returns DEAD if not set up, LAMED if initialization failed, and ALIVE
* otherwise.
*/
int gasket_interrupt_system_status(struct gasket_dev *gasket_dev);
#endif
|
