1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice unmodified, this list of conditions, and the following
12 *    disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28
29#ifndef	_LINUX_INTERRUPT_H_
30#define	_LINUX_INTERRUPT_H_
31
32#include <linux/device.h>
33#include <linux/pci.h>
34
35#include <sys/bus.h>
36#include <sys/rman.h>
37
38typedef	irqreturn_t	(*irq_handler_t)(int, void *);
39
40#define	IRQ_RETVAL(x)	((x) != IRQ_NONE)
41
42#define	IRQF_SHARED	RF_SHAREABLE
43
44struct irq_ent {
45	struct list_head	links;
46	struct device	*dev;
47	struct resource	*res;
48	void		*arg;
49	irqreturn_t	(*handler)(int, void *);
50	void		*tag;
51	int		 irq;
52};
53
54static inline int
55_irq_rid(struct device *dev, int irq)
56{
57	if (irq == dev->irq)
58		return (0);
59	return irq - dev->msix + 1;
60}
61
62static void
63_irq_handler(void *ent)
64{
65	struct irq_ent *irqe;
66
67	irqe = ent;
68	irqe->handler(irqe->irq, irqe->arg);
69}
70
71static inline struct irq_ent *
72_irq_ent(struct device *dev, int irq)
73{
74	struct irq_ent *irqe;
75
76	list_for_each_entry(irqe, &dev->irqents, links)
77		if (irqe->irq == irq)
78			return (irqe);
79
80	return (NULL);
81}
82
83static inline int
84request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
85    const char *name, void *arg)
86{
87	struct resource *res;
88	struct irq_ent *irqe;
89	struct device *dev;
90	int error;
91	int rid;
92
93	dev = _pci_find_irq_dev(irq);
94	if (dev == NULL)
95		return -ENXIO;
96	rid = _irq_rid(dev, irq);
97	res = bus_alloc_resource_any(dev->bsddev, SYS_RES_IRQ, &rid,
98	    flags | RF_ACTIVE);
99	if (res == NULL)
100		return (-ENXIO);
101	irqe = kmalloc(sizeof(*irqe), GFP_KERNEL);
102	irqe->dev = dev;
103	irqe->res = res;
104	irqe->arg = arg;
105	irqe->handler = handler;
106	irqe->irq = irq;
107	error = bus_setup_intr(dev->bsddev, res, INTR_TYPE_NET | INTR_MPSAFE,
108	    NULL, _irq_handler, irqe, &irqe->tag);
109	if (error) {
110		bus_release_resource(dev->bsddev, SYS_RES_IRQ, rid, irqe->res);
111		kfree(irqe);
112		return (-error);
113	}
114	list_add(&irqe->links, &dev->irqents);
115
116	return 0;
117}
118
119static inline void
120free_irq(unsigned int irq, void *device)
121{
122	struct irq_ent *irqe;
123	struct device *dev;
124	int rid;
125
126	dev = _pci_find_irq_dev(irq);
127	if (dev == NULL)
128		return;
129	rid = _irq_rid(dev, irq);
130	irqe = _irq_ent(dev, irq);
131	if (irqe == NULL)
132		return;
133	bus_teardown_intr(dev->bsddev, irqe->res, irqe->tag);
134	bus_release_resource(dev->bsddev, SYS_RES_IRQ, rid, irqe->res);
135	list_del(&irqe->links);
136	kfree(irqe);
137}
138
139#endif	/* _LINUX_INTERRUPT_H_ */
140