1 /****************************************************************************** 2 * xen_intr.h 3 * 4 * APIs for managing Xen event channel, virtual IRQ, and physical IRQ 5 * notifications. 6 * 7 * Copyright (c) 2004, K A Fraser 8 * Copyright (c) 2012, Spectra Logic Corporation 9 * 10 * This file may be distributed separately from the Linux kernel, or 11 * incorporated into other software packages, subject to the following license: 12 * 13 * Permission is hereby granted, free of charge, to any person obtaining a copy 14 * of this source file (the "Software"), to deal in the Software without 15 * restriction, including without limitation the rights to use, copy, modify, 16 * merge, publish, distribute, sublicense, and/or sell copies of the Software, 17 * and to permit persons to whom the Software is furnished to do so, subject to 18 * the following conditions: 19 * 20 * The above copyright notice and this permission notice shall be included in 21 * all copies or substantial portions of the Software. 22 * 23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 24 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 25 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 26 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 27 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 28 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 29 * IN THE SOFTWARE. 30 * 31 * $FreeBSD$ 32 */ 33 #ifndef _XEN_INTR_H_ 34 #define _XEN_INTR_H_ 35 36 #include <contrib/xen/event_channel.h> 37 38 /** Registered Xen interrupt callback handle. */ 39 typedef void * xen_intr_handle_t; 40 41 void xen_intr_handle_upcall(struct trapframe *trap_frame); 42 43 /** 44 * Associate an already allocated local event channel port an interrupt 45 * handler. 46 * 47 * \param dev The device making this bind request. 48 * \param local_port The event channel to bind. 49 * \param filter An interrupt filter handler. Specify NULL 50 * to always dispatch to the ithread handler. 51 * \param handler An interrupt ithread handler. Optional (can 52 * specify NULL) if all necessary event actions 53 * are performed by filter. 54 * \param arg Argument to present to both filter and handler. 55 * \param irqflags Interrupt handler flags. See sys/bus.h. 56 * \param handlep Pointer to an opaque handle used to manage this 57 * registration. 58 * 59 * \returns 0 on success, otherwise an errno. 60 */ 61 int xen_intr_bind_local_port(device_t dev, evtchn_port_t local_port, 62 driver_filter_t filter, driver_intr_t handler, void *arg, 63 enum intr_type irqflags, xen_intr_handle_t *handlep); 64 65 /** 66 * Allocate a local event channel port, accessible by the specified 67 * remote/foreign domain and, if successful, associate the port with 68 * the specified interrupt handler. 69 * 70 * \param dev The device making this bind request. 71 * \param remote_domain Remote domain grant permission to signal the 72 * newly allocated local port. 73 * \param filter An interrupt filter handler. Specify NULL 74 * to always dispatch to the ithread handler. 75 * \param handler An interrupt ithread handler. Optional (can 76 * specify NULL) if all necessary event actions 77 * are performed by filter. 78 * \param arg Argument to present to both filter and handler. 79 * \param irqflags Interrupt handler flags. See sys/bus.h. 80 * \param handlep Pointer to an opaque handle used to manage this 81 * registration. 82 * 83 * \returns 0 on success, otherwise an errno. 84 */ 85 int xen_intr_alloc_and_bind_local_port(device_t dev, 86 u_int remote_domain, driver_filter_t filter, driver_intr_t handler, 87 void *arg, enum intr_type irqflags, xen_intr_handle_t *handlep); 88 89 /** 90 * Associate the specified interrupt handler with the remote event 91 * channel port specified by remote_domain and remote_port. 92 * 93 * \param dev The device making this bind request. 94 * \param remote_domain The domain peer for this event channel connection. 95 * \param remote_port Remote domain's local port number for this event 96 * channel port. 97 * \param filter An interrupt filter handler. Specify NULL 98 * to always dispatch to the ithread handler. 99 * \param handler An interrupt ithread handler. Optional (can 100 * specify NULL) if all necessary event actions 101 * are performed by filter. 102 * \param arg Argument to present to both filter and handler. 103 * \param irqflags Interrupt handler flags. See sys/bus.h. 104 * \param handlep Pointer to an opaque handle used to manage this 105 * registration. 106 * 107 * \returns 0 on success, otherwise an errno. 108 */ 109 int xen_intr_bind_remote_port(device_t dev, u_int remote_domain, 110 evtchn_port_t remote_port, driver_filter_t filter, 111 driver_intr_t handler, void *arg, enum intr_type irqflags, 112 xen_intr_handle_t *handlep); 113 114 /** 115 * Associate the specified interrupt handler with the specified Xen 116 * virtual interrupt source. 117 * 118 * \param dev The device making this bind request. 119 * \param virq The Xen virtual IRQ number for the Xen interrupt 120 * source being hooked. 121 * \param cpu The cpu on which interrupt events should be delivered. 122 * \param filter An interrupt filter handler. Specify NULL 123 * to always dispatch to the ithread handler. 124 * \param handler An interrupt ithread handler. Optional (can 125 * specify NULL) if all necessary event actions 126 * are performed by filter. 127 * \param arg Argument to present to both filter and handler. 128 * \param irqflags Interrupt handler flags. See sys/bus.h. 129 * \param handlep Pointer to an opaque handle used to manage this 130 * registration. 131 * 132 * \returns 0 on success, otherwise an errno. 133 */ 134 int xen_intr_bind_virq(device_t dev, u_int virq, u_int cpu, 135 driver_filter_t filter, driver_intr_t handler, 136 void *arg, enum intr_type irqflags, xen_intr_handle_t *handlep); 137 138 /** 139 * Allocate a local event channel port for servicing interprocessor 140 * interupts and, if successful, associate the port with the specified 141 * interrupt handler. 142 * 143 * \param cpu The cpu receiving the IPI. 144 * \param filter The interrupt filter servicing this IPI. 145 * \param irqflags Interrupt handler flags. See sys/bus.h. 146 * \param handlep Pointer to an opaque handle used to manage this 147 * registration. 148 * 149 * \returns 0 on success, otherwise an errno. 150 */ 151 int xen_intr_alloc_and_bind_ipi(u_int cpu, 152 driver_filter_t filter, enum intr_type irqflags, 153 xen_intr_handle_t *handlep); 154 155 /** 156 * Unbind an interrupt handler from its interrupt source. 157 * 158 * \param handlep A pointer to the opaque handle that was initialized 159 * at the time the interrupt source was bound. 160 * 161 * \returns 0 on success, otherwise an errno. 162 * 163 * \note The event channel, if any, that was allocated at bind time is 164 * closed upon successful return of this method. 165 * 166 * \note It is always safe to call xen_intr_unbind() on a handle that 167 * has been initilized to NULL. 168 */ 169 void xen_intr_unbind(xen_intr_handle_t *handle); 170 171 /** 172 * Add a description to an interrupt handler. 173 * 174 * \param handle The opaque handle that was initialized at the time 175 * the interrupt source was bound. 176 * 177 * \param fmt The sprintf compatible format string for the description, 178 * followed by optional sprintf arguments. 179 * 180 * \returns 0 on success, otherwise an errno. 181 */ 182 int 183 xen_intr_describe(xen_intr_handle_t port_handle, const char *fmt, ...) 184 __attribute__((format(printf, 2, 3))); 185 186 /** 187 * Signal the remote peer of an interrupt source associated with an 188 * event channel port. 189 * 190 * \param handle The opaque handle that was initialized at the time 191 * the interrupt source was bound. 192 * 193 * \note For xen interrupt sources other than event channel ports, 194 * this method takes no action. 195 */ 196 void xen_intr_signal(xen_intr_handle_t handle); 197 198 /** 199 * Get the local event channel port number associated with this interrupt 200 * source. 201 * 202 * \param handle The opaque handle that was initialized at the time 203 * the interrupt source was bound. 204 * 205 * \returns 0 if the handle is invalid, otherwise positive port number. 206 */ 207 evtchn_port_t xen_intr_port(xen_intr_handle_t handle); 208 209 /** 210 * Bind an event channel port with a handler 211 * 212 * \param dev The device making this bind request. 213 * \param filter An interrupt filter handler. Specify NULL 214 * to always dispatch to the ithread handler. 215 * \param handler An interrupt ithread handler. Optional (can 216 * specify NULL) if all necessary event actions 217 * are performed by filter. 218 * \param arg Argument to present to both filter and handler. 219 * \param irqflags Interrupt handler flags. See sys/bus.h. 220 * \param handle Opaque handle used to manage this registration. 221 * 222 * \returns 0 on success, otherwise an errno. 223 */ 224 int xen_intr_add_handler(const char *name, driver_filter_t filter, 225 driver_intr_t handler, void *arg, enum intr_type flags, 226 xen_intr_handle_t handle); 227 228 /** 229 * Get a reference to an event channel port 230 * 231 * \param port Event channel port to which we get a reference. 232 * \param handlep Pointer to an opaque handle used to manage this 233 * registration. 234 * 235 * \returns 0 on success, otherwise an errno. 236 */ 237 int xen_intr_get_evtchn_from_port(evtchn_port_t port, 238 xen_intr_handle_t *handlep); 239 240 #endif /* _XEN_INTR_H_ */ 241