1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice unmodified, this list of conditions, and the following
13 *    disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 *
29 * $FreeBSD: stable/11/sys/compat/linuxkpi/common/include/linux/interrupt.h 352474 2019-09-18 07:24:33Z hselasky $
30 */
31#ifndef	_LINUX_INTERRUPT_H_
32#define	_LINUX_INTERRUPT_H_
33
34#include <linux/device.h>
35#include <linux/pci.h>
36#include <linux/irqreturn.h>
37
38#include <sys/bus.h>
39#include <sys/rman.h>
40
41typedef	irqreturn_t	(*irq_handler_t)(int, void *);
42
43#define	IRQF_SHARED	RF_SHAREABLE
44
45struct irq_ent {
46	struct list_head	links;
47	struct device	*dev;
48	struct resource	*res;
49	void		*arg;
50	irqreturn_t	(*handler)(int, void *);
51	void		*tag;
52	unsigned int	irq;
53};
54
55static inline int
56linux_irq_rid(struct device *dev, unsigned int irq)
57{
58	/* check for MSI- or MSIX- interrupt */
59	if (irq >= dev->irq_start && irq < dev->irq_end)
60		return (irq - dev->irq_start + 1);
61	else
62		return (0);
63}
64
65extern void linux_irq_handler(void *);
66
67static inline struct irq_ent *
68linux_irq_ent(struct device *dev, unsigned int irq)
69{
70	struct irq_ent *irqe;
71
72	list_for_each_entry(irqe, &dev->irqents, links)
73		if (irqe->irq == irq)
74			return (irqe);
75
76	return (NULL);
77}
78
79static inline int
80request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
81    const char *name, void *arg)
82{
83	struct resource *res;
84	struct irq_ent *irqe;
85	struct device *dev;
86	int error;
87	int rid;
88
89	dev = linux_pci_find_irq_dev(irq);
90	if (dev == NULL)
91		return -ENXIO;
92	rid = linux_irq_rid(dev, irq);
93	res = bus_alloc_resource_any(dev->bsddev, SYS_RES_IRQ, &rid,
94	    flags | RF_ACTIVE);
95	if (res == NULL)
96		return (-ENXIO);
97	irqe = kmalloc(sizeof(*irqe), GFP_KERNEL);
98	irqe->dev = dev;
99	irqe->res = res;
100	irqe->arg = arg;
101	irqe->handler = handler;
102	irqe->irq = irq;
103	error = bus_setup_intr(dev->bsddev, res, INTR_TYPE_NET | INTR_MPSAFE,
104	    NULL, linux_irq_handler, irqe, &irqe->tag);
105	if (error) {
106		bus_release_resource(dev->bsddev, SYS_RES_IRQ, rid, irqe->res);
107		kfree(irqe);
108		return (-error);
109	}
110	list_add(&irqe->links, &dev->irqents);
111
112	return 0;
113}
114
115static inline int
116enable_irq(unsigned int irq)
117{
118	struct irq_ent *irqe;
119	struct device *dev;
120
121	dev = linux_pci_find_irq_dev(irq);
122	if (dev == NULL)
123		return -EINVAL;
124	irqe = linux_irq_ent(dev, irq);
125	if (irqe == NULL || irqe->tag != NULL)
126		return -EINVAL;
127	return -bus_setup_intr(dev->bsddev, irqe->res, INTR_TYPE_NET | INTR_MPSAFE,
128	    NULL, linux_irq_handler, irqe, &irqe->tag);
129}
130
131static inline void
132disable_irq(unsigned int irq)
133{
134	struct irq_ent *irqe;
135	struct device *dev;
136
137	dev = linux_pci_find_irq_dev(irq);
138	if (dev == NULL)
139		return;
140	irqe = linux_irq_ent(dev, irq);
141	if (irqe == NULL)
142		return;
143	if (irqe->tag != NULL)
144		bus_teardown_intr(dev->bsddev, irqe->res, irqe->tag);
145	irqe->tag = NULL;
146}
147
148static inline int
149bind_irq_to_cpu(unsigned int irq, int cpu_id)
150{
151	struct irq_ent *irqe;
152	struct device *dev;
153
154	dev = linux_pci_find_irq_dev(irq);
155	if (dev == NULL)
156		return (-ENOENT);
157
158	irqe = linux_irq_ent(dev, irq);
159	if (irqe == NULL)
160		return (-ENOENT);
161
162	return (-bus_bind_intr(dev->bsddev, irqe->res, cpu_id));
163}
164
165static inline void
166free_irq(unsigned int irq, void *device)
167{
168	struct irq_ent *irqe;
169	struct device *dev;
170	int rid;
171
172	dev = linux_pci_find_irq_dev(irq);
173	if (dev == NULL)
174		return;
175	rid = linux_irq_rid(dev, irq);
176	irqe = linux_irq_ent(dev, irq);
177	if (irqe == NULL)
178		return;
179	if (irqe->tag != NULL)
180		bus_teardown_intr(dev->bsddev, irqe->res, irqe->tag);
181	bus_release_resource(dev->bsddev, SYS_RES_IRQ, rid, irqe->res);
182	list_del(&irqe->links);
183	kfree(irqe);
184}
185
186/*
187 * LinuxKPI tasklet support
188 */
189typedef void tasklet_func_t(unsigned long);
190
191struct tasklet_struct {
192	TAILQ_ENTRY(tasklet_struct) entry;
193	tasklet_func_t *func;
194	unsigned long data;
195};
196
197#define	DECLARE_TASKLET(_name, _func, _data)	\
198struct tasklet_struct _name = { .func = (_func), .data = (_data) }
199
200#define	tasklet_hi_schedule(t)	tasklet_schedule(t)
201
202extern void tasklet_schedule(struct tasklet_struct *);
203extern void tasklet_kill(struct tasklet_struct *);
204extern void tasklet_init(struct tasklet_struct *, tasklet_func_t *,
205    unsigned long data);
206extern void tasklet_enable(struct tasklet_struct *);
207extern void tasklet_disable(struct tasklet_struct *);
208
209#endif	/* _LINUX_INTERRUPT_H_ */
210