interrupt.h revision 219820
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