1 /*
2 * Copyright (c) 2014 Roger Pau Monné <[email protected]>
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("$FreeBSD$");
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
52 static struct mtx msi_lock;
53 static u_int msi_last_irq;
54
55 void
xen_msi_init(void)56 xen_msi_init(void)
57 {
58
59 MPASS(num_io_irqs > 0);
60 first_msi_irq = 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 */
71 int
xen_msi_alloc(device_t dev,int count,int maxcount,int * irqs)72 xen_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
100 int
xen_msi_release(int * irqs,int count)101 xen_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
114 int
xen_msi_map(int irq,uint64_t * addr,uint32_t * data)115 xen_msi_map(int irq, uint64_t *addr, uint32_t *data)
116 {
117
118 return (0);
119 }
120
121 int
xen_msix_alloc(device_t dev,int * irq)122 xen_msix_alloc(device_t dev, int *irq)
123 {
124
125 return (ENXIO);
126 }
127
128 int
xen_msix_release(int irq)129 xen_msix_release(int irq)
130 {
131
132 return (ENOENT);
133 }
134