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 * $FreeBSD$ 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 41 typedef irqreturn_t (*irq_handler_t)(int, void *); 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 unsigned int irq; 53 }; 54 55 static inline int 56 linux_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 65 extern void linux_irq_handler(void *); 66 67 static inline struct irq_ent * 68 linux_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 79 static inline int 80 request_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 } 114 115 static inline int 116 enable_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 } 130 131 static inline void 132 disable_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 } 147 148 static inline int 149 bind_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 } 164 165 static inline void 166 free_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 */ 189 typedef void tasklet_func_t(unsigned long); 190 191 struct tasklet_struct { 192 TAILQ_ENTRY(tasklet_struct) entry; 193 tasklet_func_t *func; 194 /* Our "state" implementation is different. Avoid same name as Linux. */ 195 volatile u_int tasklet_state; 196 atomic_t count; 197 unsigned long data; 198 }; 199 200 #define DECLARE_TASKLET(_name, _func, _data) \ 201 struct tasklet_struct _name = { .func = (_func), .data = (_data) } 202 203 #define tasklet_hi_schedule(t) tasklet_schedule(t) 204 205 extern void tasklet_schedule(struct tasklet_struct *); 206 extern void tasklet_kill(struct tasklet_struct *); 207 extern void tasklet_init(struct tasklet_struct *, tasklet_func_t *, 208 unsigned long data); 209 extern void tasklet_enable(struct tasklet_struct *); 210 extern void tasklet_disable(struct tasklet_struct *); 211 extern int tasklet_trylock(struct tasklet_struct *); 212 extern void tasklet_unlock(struct tasklet_struct *); 213 extern void tasklet_unlock_wait(struct tasklet_struct *ts); 214 215 #endif /* _LINUX_INTERRUPT_H_ */ 216