intr_machdep.h revision 305672 
1/*-
2 * Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: stable/11/sys/amd64/include/intr_machdep.h 305672 2016-09-09 19:57:32Z jhb $
27 */
28
29#ifndef __MACHINE_INTR_MACHDEP_H__
30#define	__MACHINE_INTR_MACHDEP_H__
31
32#ifdef _KERNEL
33
34/*
35 * The maximum number of I/O interrupts we allow.  This number is rather
36 * arbitrary as it is just the maximum IRQ resource value.  The interrupt
37 * source for a given IRQ maps that I/O interrupt to device interrupt
38 * source whether it be a pin on an interrupt controller or an MSI interrupt.
39 * The 16 ISA IRQs are assigned fixed IDT vectors, but all other device
40 * interrupts allocate IDT vectors on demand.  Currently we have 191 IDT
41 * vectors available for device interrupts.  On many systems with I/O APICs,
42 * a lot of the IRQs are not used, so this number can be much larger than
43 * 191 and still be safe since only interrupt sources in actual use will
44 * allocate IDT vectors.
45 *
46 * The first 255 IRQs (0 - 254) are reserved for ISA IRQs and PCI intline IRQs.
47 * IRQ values from 256 to 767 are used by MSI.  When running under the Xen
48 * Hypervisor, IRQ values from 768 to 4863 are available for binding to
49 * event channel events.  We leave 255 unused to avoid confusion since 255 is
50 * used in PCI to indicate an invalid IRQ.
51 */
52#define	NUM_MSI_INTS	512
53#define	FIRST_MSI_INT	256
54#ifdef XENHVM
55#include <xen/xen-os.h>
56#include <xen/interface/event_channel.h>
57#define	NUM_EVTCHN_INTS	NR_EVENT_CHANNELS
58#define	FIRST_EVTCHN_INT \
59    (FIRST_MSI_INT + NUM_MSI_INTS)
60#define	LAST_EVTCHN_INT \
61    (FIRST_EVTCHN_INT + NUM_EVTCHN_INTS - 1)
62#else
63#define	NUM_EVTCHN_INTS	0
64#endif
65#define	NUM_IO_INTS	(FIRST_MSI_INT + NUM_MSI_INTS + NUM_EVTCHN_INTS)
66
67/*
68 * Default base address for MSI messages on x86 platforms.
69 */
70#define	MSI_INTEL_ADDR_BASE		0xfee00000
71
72/*
73 * - 1 ??? dummy counter.
74 * - 2 counters for each I/O interrupt.
75 * - 1 counter for each CPU for lapic timer.
76 * - 8 counters for each CPU for IPI counters for SMP.
77 */
78#ifdef SMP
79#define	INTRCNT_COUNT	(1 + NUM_IO_INTS * 2 + (1 + 8) * MAXCPU)
80#else
81#define	INTRCNT_COUNT	(1 + NUM_IO_INTS * 2 + 1)
82#endif
83
84#ifndef LOCORE
85
86typedef void inthand_t(void);
87
88#define	IDTVEC(name)	__CONCAT(X,name)
89
90struct intsrc;
91
92/*
93 * Methods that a PIC provides to mask/unmask a given interrupt source,
94 * "turn on" the interrupt on the CPU side by setting up an IDT entry, and
95 * return the vector associated with this source.
96 */
97struct pic {
98	void (*pic_enable_source)(struct intsrc *);
99	void (*pic_disable_source)(struct intsrc *, int);
100	void (*pic_eoi_source)(struct intsrc *);
101	void (*pic_enable_intr)(struct intsrc *);
102	void (*pic_disable_intr)(struct intsrc *);
103	int (*pic_vector)(struct intsrc *);
104	int (*pic_source_pending)(struct intsrc *);
105	void (*pic_suspend)(struct pic *);
106	void (*pic_resume)(struct pic *, bool suspend_cancelled);
107	int (*pic_config_intr)(struct intsrc *, enum intr_trigger,
108	    enum intr_polarity);
109	int (*pic_assign_cpu)(struct intsrc *, u_int apic_id);
110	void (*pic_reprogram_pin)(struct intsrc *);
111	TAILQ_ENTRY(pic) pics;
112};
113
114/* Flags for pic_disable_source() */
115enum {
116	PIC_EOI,
117	PIC_NO_EOI,
118};
119
120/*
121 * An interrupt source.  The upper-layer code uses the PIC methods to
122 * control a given source.  The lower-layer PIC drivers can store additional
123 * private data in a given interrupt source such as an interrupt pin number
124 * or an I/O APIC pointer.
125 */
126struct intsrc {
127	struct pic *is_pic;
128	struct intr_event *is_event;
129	u_long *is_count;
130	u_long *is_straycount;
131	u_int is_index;
132	u_int is_handlers;
133};
134
135struct trapframe;
136
137/*
138 * The following data structure holds per-cpu data, and is placed just
139 * above the top of the space used for the NMI stack.
140 */
141struct nmi_pcpu {
142	register_t	np_pcpu;
143	register_t	__padding;	/* pad to 16 bytes */
144};
145
146#ifdef SMP
147extern cpuset_t intr_cpus;
148#endif
149extern struct mtx icu_lock;
150extern int elcr_found;
151#ifdef SMP
152extern int msix_disable_migration;
153#endif
154
155#ifndef DEV_ATPIC
156void	atpic_reset(void);
157#endif
158/* XXX: The elcr_* prototypes probably belong somewhere else. */
159int	elcr_probe(void);
160enum intr_trigger elcr_read_trigger(u_int irq);
161void	elcr_resume(void);
162void	elcr_write_trigger(u_int irq, enum intr_trigger trigger);
163#ifdef SMP
164void	intr_add_cpu(u_int cpu);
165#endif
166int	intr_add_handler(const char *name, int vector, driver_filter_t filter,
167			 driver_intr_t handler, void *arg, enum intr_type flags,
168			 void **cookiep);
169#ifdef SMP
170int	intr_bind(u_int vector, u_char cpu);
171#endif
172int	intr_config_intr(int vector, enum intr_trigger trig,
173    enum intr_polarity pol);
174int	intr_describe(u_int vector, void *ih, const char *descr);
175void	intr_execute_handlers(struct intsrc *isrc, struct trapframe *frame);
176u_int	intr_next_cpu(void);
177struct intsrc *intr_lookup_source(int vector);
178int	intr_register_pic(struct pic *pic);
179int	intr_register_source(struct intsrc *isrc);
180int	intr_remove_handler(void *cookie);
181void	intr_resume(bool suspend_cancelled);
182void	intr_suspend(void);
183void	intr_reprogram(void);
184void	intrcnt_add(const char *name, u_long **countp);
185void	nexus_add_irq(u_long irq);
186int	msi_alloc(device_t dev, int count, int maxcount, int *irqs);
187void	msi_init(void);
188int	msi_map(int irq, uint64_t *addr, uint32_t *data);
189int	msi_release(int *irqs, int count);
190int	msix_alloc(device_t dev, int *irq);
191int	msix_release(int irq);
192
193#endif	/* !LOCORE */
194#endif	/* _KERNEL */
195#endif	/* !__MACHINE_INTR_MACHDEP_H__ */
196