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
30#ifndef	_LINUX_INTERRUPT_H_
31#define	_LINUX_INTERRUPT_H_
32
33#include <linux/device.h>
34#include <linux/pci.h>
35
36#include <sys/bus.h>
37#include <sys/rman.h>
38
39typedef	irqreturn_t	(*irq_handler_t)(int, void *);
40
41#define	IRQ_RETVAL(x)	((x) != IRQ_NONE)
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	int		 irq;
53};
54
55static inline int
56_irq_rid(struct device *dev, int irq)
57{
58	if (irq == dev->irq)
59		return (0);
60	return irq - dev->msix + 1;
61}
62
63static void
64_irq_handler(void *ent)
65{
66	struct irq_ent *irqe;
67
68	irqe = ent;
69	irqe->handler(irqe->irq, irqe->arg);
70}
71
72static inline struct irq_ent *
73_irq_ent(struct device *dev, int irq)
74{
75	struct irq_ent *irqe;
76
77	list_for_each_entry(irqe, &dev->irqents, links)
78		if (irqe->irq == irq)
79			return (irqe);
80
81	return (NULL);
82}
83
84static inline int
85request_irq(unsigned int irq, irq_handler_t handler, unsigned long flags,
86    const char *name, void *arg)
87{
88	struct resource *res;
89	struct irq_ent *irqe;
90	struct device *dev;
91	int error;
92	int rid;
93
94	dev = _pci_find_irq_dev(irq);
95	if (dev == NULL)
96		return -ENXIO;
97	rid = _irq_rid(dev, irq);
98	res = bus_alloc_resource_any(dev->bsddev, SYS_RES_IRQ, &rid,
99	    flags | RF_ACTIVE);
100	if (res == NULL)
101		return (-ENXIO);
102	irqe = kmalloc(sizeof(*irqe), GFP_KERNEL);
103	irqe->dev = dev;
104	irqe->res = res;
105	irqe->arg = arg;
106	irqe->handler = handler;
107	irqe->irq = irq;
108	error = bus_setup_intr(dev->bsddev, res, INTR_TYPE_NET | INTR_MPSAFE,
109	    NULL, _irq_handler, irqe, &irqe->tag);
110	if (error) {
111		bus_release_resource(dev->bsddev, SYS_RES_IRQ, rid, irqe->res);
112		kfree(irqe);
113		return (-error);
114	}
115	list_add(&irqe->links, &dev->irqents);
116
117	return 0;
118}
119
120static inline int
121bind_irq_to_cpu(unsigned int irq, int cpu_id)
122{
123	struct irq_ent *irqe;
124	struct device *dev;
125
126	dev = _pci_find_irq_dev(irq);
127	if (dev == NULL)
128		return (-ENOENT);
129
130	irqe = _irq_ent(dev, irq);
131	if (irqe == NULL)
132		return (-ENOENT);
133
134	return (-bus_bind_intr(dev->bsddev, irqe->res, cpu_id));
135}
136
137static inline void
138free_irq(unsigned int irq, void *device)
139{
140	struct irq_ent *irqe;
141	struct device *dev;
142	int rid;
143
144	dev = _pci_find_irq_dev(irq);
145	if (dev == NULL)
146		return;
147	rid = _irq_rid(dev, irq);
148	irqe = _irq_ent(dev, irq);
149	if (irqe == NULL)
150		return;
151	bus_teardown_intr(dev->bsddev, irqe->res, irqe->tag);
152	bus_release_resource(dev->bsddev, SYS_RES_IRQ, rid, irqe->res);
153	list_del(&irqe->links);
154	kfree(irqe);
155}
156
157#endif	/* _LINUX_INTERRUPT_H_ */
158