1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2008 Citrix Systems, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/param.h>
30 #include <sys/bus.h>
31 #include <sys/kernel.h>
32 #include <sys/malloc.h>
33 #include <sys/module.h>
34
35 #include <machine/bus.h>
36 #include <machine/resource.h>
37 #include <sys/rman.h>
38
39 #include <machine/stdarg.h>
40
41 #include <xen/xen-os.h>
42 #include <xen/features.h>
43 #include <xen/hypervisor.h>
44 #include <xen/hvm.h>
45 #include <xen/xen_intr.h>
46
47 #include <dev/pci/pcireg.h>
48 #include <dev/pci/pcivar.h>
49
50 #include <dev/xen/xenpci/xenpcivar.h>
51
52 static int
xenpci_irq_init(device_t device,struct xenpci_softc * scp)53 xenpci_irq_init(device_t device, struct xenpci_softc *scp)
54 {
55 int error;
56
57 error = BUS_SETUP_INTR(device_get_parent(device), device,
58 scp->res_irq, INTR_MPSAFE|INTR_TYPE_MISC,
59 xen_intr_handle_upcall, NULL, NULL,
60 &scp->intr_cookie);
61 if (error)
62 return error;
63
64 #ifdef SMP
65 /*
66 * When using the PCI event delivery callback we cannot assign
67 * events to specific vCPUs, so all events are delivered to vCPU#0 by
68 * Xen. Since the PCI interrupt can fire on any CPU by default, we
69 * need to bind it to vCPU#0 in order to ensure that
70 * xen_intr_handle_upcall always gets called on vCPU#0.
71 */
72 error = BUS_BIND_INTR(device_get_parent(device), device,
73 scp->res_irq, 0);
74 if (error)
75 return error;
76 #endif
77
78 xen_hvm_set_callback(device);
79 return (0);
80 }
81
82 /*
83 * Deallocate anything allocated by xenpci_allocate_resources.
84 */
85 static int
xenpci_deallocate_resources(device_t dev)86 xenpci_deallocate_resources(device_t dev)
87 {
88 struct xenpci_softc *scp = device_get_softc(dev);
89
90 if (scp->res_irq != 0) {
91 bus_deactivate_resource(dev, SYS_RES_IRQ,
92 scp->rid_irq, scp->res_irq);
93 bus_release_resource(dev, SYS_RES_IRQ,
94 scp->rid_irq, scp->res_irq);
95 scp->res_irq = 0;
96 }
97
98 return (0);
99 }
100
101 /*
102 * Allocate irq and memory resources.
103 */
104 static int
xenpci_allocate_resources(device_t dev)105 xenpci_allocate_resources(device_t dev)
106 {
107 struct xenpci_softc *scp = device_get_softc(dev);
108
109 scp->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ,
110 &scp->rid_irq, RF_SHAREABLE|RF_ACTIVE);
111 if (scp->res_irq == NULL) {
112 printf("xenpci Could not allocate irq.\n");
113 goto errexit;
114 }
115
116 return (0);
117
118 errexit:
119 /* Cleanup anything we may have assigned. */
120 xenpci_deallocate_resources(dev);
121 return (ENXIO); /* For want of a better idea. */
122 }
123
124 /*
125 * Probe - just check device ID.
126 */
127 static int
xenpci_probe(device_t dev)128 xenpci_probe(device_t dev)
129 {
130
131 if (pci_get_devid(dev) != 0x00015853)
132 return (ENXIO);
133
134 device_set_desc(dev, "Xen Platform Device");
135 return (BUS_PROBE_DEFAULT);
136 }
137
138 /*
139 * Attach - find resources and talk to Xen.
140 */
141 static int
xenpci_attach(device_t dev)142 xenpci_attach(device_t dev)
143 {
144 struct xenpci_softc *scp = device_get_softc(dev);
145 int error;
146
147 error = xenpci_allocate_resources(dev);
148 if (error) {
149 device_printf(dev, "xenpci_allocate_resources failed(%d).\n",
150 error);
151 goto errexit;
152 }
153
154 /*
155 * Hook the irq up to evtchn
156 */
157 error = xenpci_irq_init(dev, scp);
158 if (error) {
159 device_printf(dev, "xenpci_irq_init failed(%d).\n",
160 error);
161 goto errexit;
162 }
163
164 return (0);
165
166 errexit:
167 /*
168 * Undo anything we may have done.
169 */
170 xenpci_deallocate_resources(dev);
171 return (error);
172 }
173
174 /*
175 * Detach - reverse anything done by attach.
176 */
177 static int
xenpci_detach(device_t dev)178 xenpci_detach(device_t dev)
179 {
180 struct xenpci_softc *scp = device_get_softc(dev);
181 device_t parent = device_get_parent(dev);
182
183 /*
184 * Take our interrupt handler out of the list of handlers
185 * that can handle this irq.
186 */
187 if (scp->intr_cookie != NULL) {
188 if (BUS_TEARDOWN_INTR(parent, dev,
189 scp->res_irq, scp->intr_cookie) != 0)
190 device_printf(dev,
191 "intr teardown failed.. continuing\n");
192 scp->intr_cookie = NULL;
193 }
194
195 /*
196 * Deallocate any system resources we may have
197 * allocated on behalf of this driver.
198 */
199 return (xenpci_deallocate_resources(dev));
200 }
201
202 static int
xenpci_resume(device_t dev)203 xenpci_resume(device_t dev)
204 {
205 xen_hvm_set_callback(dev);
206 return (0);
207 }
208
209 static device_method_t xenpci_methods[] = {
210 /* Device interface */
211 DEVMETHOD(device_probe, xenpci_probe),
212 DEVMETHOD(device_attach, xenpci_attach),
213 DEVMETHOD(device_detach, xenpci_detach),
214 DEVMETHOD(device_resume, xenpci_resume),
215
216 DEVMETHOD_END
217 };
218
219 static driver_t xenpci_driver = {
220 "xenpci",
221 xenpci_methods,
222 sizeof(struct xenpci_softc),
223 };
224
225 DRIVER_MODULE(xenpci, pci, xenpci_driver, 0, 0);
226