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
39 typedef irqreturn_t (*irq_handler_t)(int, void *);
40
41 #define IRQ_RETVAL(x) ((x) != IRQ_NONE)
42
43 #define IRQF_SHARED RF_SHAREABLE
44
45 struct 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
55 static inline int
_irq_rid(struct device * dev,int irq)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
63 static void
_irq_handler(void * ent)64 _irq_handler(void *ent)
65 {
66 struct irq_ent *irqe;
67
68 irqe = ent;
69 irqe->handler(irqe->irq, irqe->arg);
70 }
71
72 static inline struct irq_ent *
_irq_ent(struct device * dev,int irq)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
84 static inline int
request_irq(unsigned int irq,irq_handler_t handler,unsigned long flags,const char * name,void * arg)85 request_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
120 static inline int
bind_irq_to_cpu(unsigned int irq,int cpu_id)121 bind_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
137 static inline void
free_irq(unsigned int irq,void * device)138 free_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