ia64/linux-2.6.18-xen.hg

view include/xen/evtchn.h @ 912:dd42cdb0ab89

[IA64] Build blktap2 driver by default in x86 builds.

add CONFIG_XEN_BLKDEV_TAP2=y to buildconfigs/linux-defconfig_xen_ia64.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Mon Jun 29 12:09:16 2009 +0900 (2009-06-29)
parents ddb6d2257ec4
children
line source
1 /******************************************************************************
2 * evtchn.h
3 *
4 * Communication via Xen event channels.
5 * Also definitions for the device that demuxes notifications to userspace.
6 *
7 * Copyright (c) 2004-2005, K A Fraser
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation; or, when distributed
12 * separately from the Linux kernel or incorporated into other
13 * software packages, subject to the following license:
14 *
15 * Permission is hereby granted, free of charge, to any person obtaining a copy
16 * of this source file (the "Software"), to deal in the Software without
17 * restriction, including without limitation the rights to use, copy, modify,
18 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
19 * and to permit persons to whom the Software is furnished to do so, subject to
20 * the following conditions:
21 *
22 * The above copyright notice and this permission notice shall be included in
23 * all copies or substantial portions of the Software.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
28 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
29 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
30 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
31 * IN THE SOFTWARE.
32 */
34 #ifndef __ASM_EVTCHN_H__
35 #define __ASM_EVTCHN_H__
37 #include <linux/interrupt.h>
38 #include <asm/hypervisor.h>
39 #include <asm/ptrace.h>
40 #include <asm/synch_bitops.h>
41 #include <xen/interface/event_channel.h>
42 #include <linux/smp.h>
44 /*
45 * LOW-LEVEL DEFINITIONS
46 */
48 /*
49 * Dynamically bind an event source to an IRQ-like callback handler.
50 * On some platforms this may not be implemented via the Linux IRQ subsystem.
51 * The IRQ argument passed to the callback handler is the same as returned
52 * from the bind call. It may not correspond to a Linux IRQ number.
53 * Returns IRQ or negative errno.
54 */
55 int bind_caller_port_to_irqhandler(
56 unsigned int caller_port,
57 irqreturn_t (*handler)(int, void *, struct pt_regs *),
58 unsigned long irqflags,
59 const char *devname,
60 void *dev_id);
61 int bind_listening_port_to_irqhandler(
62 unsigned int remote_domain,
63 irqreturn_t (*handler)(int, void *, struct pt_regs *),
64 unsigned long irqflags,
65 const char *devname,
66 void *dev_id);
67 int bind_interdomain_evtchn_to_irqhandler(
68 unsigned int remote_domain,
69 unsigned int remote_port,
70 irqreturn_t (*handler)(int, void *, struct pt_regs *),
71 unsigned long irqflags,
72 const char *devname,
73 void *dev_id);
74 int bind_virq_to_irqhandler(
75 unsigned int virq,
76 unsigned int cpu,
77 irqreturn_t (*handler)(int, void *, struct pt_regs *),
78 unsigned long irqflags,
79 const char *devname,
80 void *dev_id);
81 int bind_ipi_to_irqhandler(
82 unsigned int ipi,
83 unsigned int cpu,
84 irqreturn_t (*handler)(int, void *, struct pt_regs *),
85 unsigned long irqflags,
86 const char *devname,
87 void *dev_id);
89 /*
90 * Common unbind function for all event sources. Takes IRQ to unbind from.
91 * Automatically closes the underlying event channel (except for bindings
92 * made with bind_caller_port_to_irqhandler()).
93 */
94 void unbind_from_irqhandler(unsigned int irq, void *dev_id);
96 void irq_resume(void);
98 /* Entry point for notifications into Linux subsystems. */
99 asmlinkage void evtchn_do_upcall(struct pt_regs *regs);
101 /* Entry point for notifications into the userland character device. */
102 void evtchn_device_upcall(int port);
104 /* Mark a PIRQ as unavailable for dynamic allocation. */
105 void evtchn_register_pirq(int irq);
106 /* Map a Xen-supplied PIRQ to a dynamically allocated one. */
107 int evtchn_map_pirq(int irq, int xen_pirq);
108 /* Look up a Xen-supplied PIRQ for a dynamically allocated one. */
109 int evtchn_get_xen_pirq(int irq);
111 void mask_evtchn(int port);
112 void disable_all_local_evtchn(void);
113 void unmask_evtchn(int port);
115 #ifdef CONFIG_SMP
116 void rebind_evtchn_to_cpu(int port, unsigned int cpu);
117 #else
118 #define rebind_evtchn_to_cpu(port, cpu) ((void)0)
119 #endif
121 static inline int test_and_set_evtchn_mask(int port)
122 {
123 shared_info_t *s = HYPERVISOR_shared_info;
124 return synch_test_and_set_bit(port, s->evtchn_mask);
125 }
127 static inline void clear_evtchn(int port)
128 {
129 shared_info_t *s = HYPERVISOR_shared_info;
130 synch_clear_bit(port, s->evtchn_pending);
131 }
133 static inline void notify_remote_via_evtchn(int port)
134 {
135 struct evtchn_send send = { .port = port };
136 VOID(HYPERVISOR_event_channel_op(EVTCHNOP_send, &send));
137 }
139 /*
140 * Use these to access the event channel underlying the IRQ handle returned
141 * by bind_*_to_irqhandler().
142 */
143 void notify_remote_via_irq(int irq);
144 int irq_to_evtchn_port(int irq);
146 #endif /* __ASM_EVTCHN_H__ */