1 /*
2 * Copyright (c) 2013 Roger Pau Monné <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("$FreeBSD$");
29
30 #include <sys/param.h>
31 #include <sys/systm.h>
32 #include <sys/bus.h>
33 #include <sys/kernel.h>
34 #include <sys/module.h>
35 #include <sys/pcpu.h>
36 #include <sys/smp.h>
37
38 #include <xen/xen-os.h>
39
40 /*
41 * Dummy Xen cpu device
42 *
43 * Since there's no ACPI on PVH guests, we need to create a dummy
44 * CPU device in order to fill the pcpu->pc_device field.
45 */
46
47 static void
xenpvcpu_identify(driver_t * driver,device_t parent)48 xenpvcpu_identify(driver_t *driver, device_t parent)
49 {
50 int i;
51
52 /* Only attach to PV guests, HVM guests use the ACPI CPU devices */
53 if (!xen_pv_domain())
54 return;
55
56 CPU_FOREACH(i) {
57 if (BUS_ADD_CHILD(parent, 0, "pvcpu", i) == NULL)
58 panic("Unable to add Xen PV CPU device.");
59 }
60 }
61
62 static int
xenpvcpu_probe(device_t dev)63 xenpvcpu_probe(device_t dev)
64 {
65
66 device_set_desc(dev, "Xen PV CPU");
67 return (BUS_PROBE_NOWILDCARD);
68 }
69
70 static int
xenpvcpu_attach(device_t dev)71 xenpvcpu_attach(device_t dev)
72 {
73 struct pcpu *pc;
74 int cpu;
75
76 cpu = device_get_unit(dev);
77 pc = pcpu_find(cpu);
78 pc->pc_device = dev;
79 return (0);
80 }
81
82 static device_method_t xenpvcpu_methods[] = {
83 DEVMETHOD(device_identify, xenpvcpu_identify),
84 DEVMETHOD(device_probe, xenpvcpu_probe),
85 DEVMETHOD(device_attach, xenpvcpu_attach),
86
87 DEVMETHOD_END
88 };
89
90 static driver_t xenpvcpu_driver = {
91 "pvcpu",
92 xenpvcpu_methods,
93 0,
94 };
95
96 devclass_t xenpvcpu_devclass;
97
98 DRIVER_MODULE(xenpvcpu, xenpv, xenpvcpu_driver, xenpvcpu_devclass, 0, 0);
99 MODULE_DEPEND(xenpvcpu, xenpv, 1, 1, 1);
100