1/*
2 * Copyright (c) 2014 Roger Pau Monn�� <roger.pau@citrix.com>
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
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: stable/11/sys/x86/xen/xen_msi.c 344912 2019-03-08 01:04:19Z jhb $");
29
30#include <sys/param.h>
31#include <sys/bus.h>
32#include <sys/kernel.h>
33#include <sys/limits.h>
34#include <sys/lock.h>
35#include <sys/malloc.h>
36#include <sys/mutex.h>
37#include <sys/sx.h>
38#include <sys/systm.h>
39#include <x86/apicreg.h>
40#include <machine/cputypes.h>
41#include <machine/md_var.h>
42#include <machine/frame.h>
43#include <machine/intr_machdep.h>
44#include <x86/apicvar.h>
45#include <machine/specialreg.h>
46#include <dev/pci/pcivar.h>
47
48#include <xen/xen-os.h>
49#include <xen/xen_intr.h>
50#include <xen/xen_msi.h>
51
52static struct mtx msi_lock;
53static u_int msi_last_irq;
54
55void
56xen_msi_init(void)
57{
58
59	MPASS(num_io_irqs > 0);
60	first_msi_irq = min(MINIMUM_MSI_INT, num_io_irqs);
61	if (num_msi_irqs > UINT_MAX - first_msi_irq)
62		panic("num_msi_irqs too high");
63	num_io_irqs = first_msi_irq + num_msi_irqs;
64
65	mtx_init(&msi_lock, "msi", NULL, MTX_DEF);
66}
67
68/*
69 * Try to allocate 'count' interrupt sources with contiguous IDT values.
70 */
71int
72xen_msi_alloc(device_t dev, int count, int maxcount, int *irqs)
73{
74	int i, ret = 0;
75
76	mtx_lock(&msi_lock);
77
78	/* If we would exceed the max, give up. */
79	if (msi_last_irq + count > num_msi_irqs) {
80		mtx_unlock(&msi_lock);
81		return (ENXIO);
82	}
83
84	/* Allocate MSI vectors */
85	for (i = 0; i < count; i++)
86		irqs[i] = first_msi_irq + msi_last_irq++;
87
88	mtx_unlock(&msi_lock);
89
90	ret = xen_register_msi(dev, irqs[0], count);
91	if (ret != 0)
92		return (ret);
93
94	for (i = 0; i < count; i++)
95		nexus_add_irq(irqs[i]);
96
97	return (0);
98}
99
100int
101xen_msi_release(int *irqs, int count)
102{
103	int i, ret;
104
105	for (i = 0; i < count; i++) {
106		ret = xen_release_msi(irqs[i]);
107		if (ret != 0)
108			return (ret);
109	}
110
111	return (0);
112}
113
114int
115xen_msi_map(int irq, uint64_t *addr, uint32_t *data)
116{
117
118	return (0);
119}
120
121int
122xen_msix_alloc(device_t dev, int *irq)
123{
124
125	return (ENXIO);
126}
127
128int
129xen_msix_release(int irq)
130{
131
132	return (ENOENT);
133}
134