2 * Copyright (c) 2008 Citrix Systems, Inc.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
32 #include <sys/kernel.h>
33 #include <sys/malloc.h>
34 #include <sys/module.h>
36 #include <machine/bus.h>
37 #include <machine/resource.h>
40 #include <machine/stdarg.h>
42 #include <xen/xen-os.h>
43 #include <xen/features.h>
44 #include <xen/hypervisor.h>
47 #include <dev/pci/pcireg.h>
48 #include <dev/pci/pcivar.h>
50 #include <dev/xen/xenpci/xenpcivar.h>
52 extern void xen_intr_handle_upcall(struct trapframe *trap_frame);
55 * This is used to find our platform device instance.
57 static devclass_t xenpci_devclass;
60 xenpci_intr_filter(void *trap_frame)
62 xen_intr_handle_upcall(trap_frame);
63 return (FILTER_HANDLED);
67 xenpci_irq_init(device_t device, struct xenpci_softc *scp)
71 error = BUS_SETUP_INTR(device_get_parent(device), device,
72 scp->res_irq, INTR_MPSAFE|INTR_TYPE_MISC,
73 xenpci_intr_filter, NULL, /*trap_frame*/NULL,
80 * When using the PCI event delivery callback we cannot assign
81 * events to specific vCPUs, so all events are delivered to vCPU#0 by
82 * Xen. Since the PCI interrupt can fire on any CPU by default, we
83 * need to bind it to vCPU#0 in order to ensure that
84 * xen_intr_handle_upcall always gets called on vCPU#0.
86 error = BUS_BIND_INTR(device_get_parent(device), device,
92 xen_hvm_set_callback(device);
97 * Deallocate anything allocated by xenpci_allocate_resources.
100 xenpci_deallocate_resources(device_t dev)
102 struct xenpci_softc *scp = device_get_softc(dev);
104 if (scp->res_irq != 0) {
105 bus_deactivate_resource(dev, SYS_RES_IRQ,
106 scp->rid_irq, scp->res_irq);
107 bus_release_resource(dev, SYS_RES_IRQ,
108 scp->rid_irq, scp->res_irq);
116 * Allocate irq and memory resources.
119 xenpci_allocate_resources(device_t dev)
121 struct xenpci_softc *scp = device_get_softc(dev);
123 scp->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ,
124 &scp->rid_irq, RF_SHAREABLE|RF_ACTIVE);
125 if (scp->res_irq == NULL) {
126 printf("xenpci Could not allocate irq.\n");
133 /* Cleanup anything we may have assigned. */
134 xenpci_deallocate_resources(dev);
135 return (ENXIO); /* For want of a better idea. */
139 * Probe - just check device ID.
142 xenpci_probe(device_t dev)
145 if (pci_get_devid(dev) != 0x00015853)
148 device_set_desc(dev, "Xen Platform Device");
149 return (BUS_PROBE_DEFAULT);
153 * Attach - find resources and talk to Xen.
156 xenpci_attach(device_t dev)
158 struct xenpci_softc *scp = device_get_softc(dev);
161 error = xenpci_allocate_resources(dev);
163 device_printf(dev, "xenpci_allocate_resources failed(%d).\n",
169 * Hook the irq up to evtchn
171 error = xenpci_irq_init(dev, scp);
173 device_printf(dev, "xenpci_irq_init failed(%d).\n",
182 * Undo anything we may have done.
184 xenpci_deallocate_resources(dev);
189 * Detach - reverse anything done by attach.
192 xenpci_detach(device_t dev)
194 struct xenpci_softc *scp = device_get_softc(dev);
195 device_t parent = device_get_parent(dev);
198 * Take our interrupt handler out of the list of handlers
199 * that can handle this irq.
201 if (scp->intr_cookie != NULL) {
202 if (BUS_TEARDOWN_INTR(parent, dev,
203 scp->res_irq, scp->intr_cookie) != 0)
205 "intr teardown failed.. continuing\n");
206 scp->intr_cookie = NULL;
210 * Deallocate any system resources we may have
211 * allocated on behalf of this driver.
213 return (xenpci_deallocate_resources(dev));
217 xenpci_resume(device_t dev)
219 xen_hvm_set_callback(dev);
223 static device_method_t xenpci_methods[] = {
224 /* Device interface */
225 DEVMETHOD(device_probe, xenpci_probe),
226 DEVMETHOD(device_attach, xenpci_attach),
227 DEVMETHOD(device_detach, xenpci_detach),
228 DEVMETHOD(device_resume, xenpci_resume),
233 static driver_t xenpci_driver = {
236 sizeof(struct xenpci_softc),
239 DRIVER_MODULE(xenpci, pci, xenpci_driver, xenpci_devclass, 0, 0);