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>
46 #include <xen/xen_intr.h>
48 #include <dev/pci/pcireg.h>
49 #include <dev/pci/pcivar.h>
51 #include <dev/xen/xenpci/xenpcivar.h>
54 * This is used to find our platform device instance.
56 static devclass_t xenpci_devclass;
59 xenpci_intr_filter(void *trap_frame)
61 xen_intr_handle_upcall(trap_frame);
62 return (FILTER_HANDLED);
66 xenpci_irq_init(device_t device, struct xenpci_softc *scp)
70 error = BUS_SETUP_INTR(device_get_parent(device), device,
71 scp->res_irq, INTR_MPSAFE|INTR_TYPE_MISC,
72 xenpci_intr_filter, NULL, /*trap_frame*/NULL,
79 * When using the PCI event delivery callback we cannot assign
80 * events to specific vCPUs, so all events are delivered to vCPU#0 by
81 * Xen. Since the PCI interrupt can fire on any CPU by default, we
82 * need to bind it to vCPU#0 in order to ensure that
83 * xen_intr_handle_upcall always gets called on vCPU#0.
85 error = BUS_BIND_INTR(device_get_parent(device), device,
91 xen_hvm_set_callback(device);
96 * Deallocate anything allocated by xenpci_allocate_resources.
99 xenpci_deallocate_resources(device_t dev)
101 struct xenpci_softc *scp = device_get_softc(dev);
103 if (scp->res_irq != 0) {
104 bus_deactivate_resource(dev, SYS_RES_IRQ,
105 scp->rid_irq, scp->res_irq);
106 bus_release_resource(dev, SYS_RES_IRQ,
107 scp->rid_irq, scp->res_irq);
115 * Allocate irq and memory resources.
118 xenpci_allocate_resources(device_t dev)
120 struct xenpci_softc *scp = device_get_softc(dev);
122 scp->res_irq = bus_alloc_resource_any(dev, SYS_RES_IRQ,
123 &scp->rid_irq, RF_SHAREABLE|RF_ACTIVE);
124 if (scp->res_irq == NULL) {
125 printf("xenpci Could not allocate irq.\n");
132 /* Cleanup anything we may have assigned. */
133 xenpci_deallocate_resources(dev);
134 return (ENXIO); /* For want of a better idea. */
138 * Probe - just check device ID.
141 xenpci_probe(device_t dev)
144 if (pci_get_devid(dev) != 0x00015853)
147 device_set_desc(dev, "Xen Platform Device");
148 return (BUS_PROBE_DEFAULT);
152 * Attach - find resources and talk to Xen.
155 xenpci_attach(device_t dev)
157 struct xenpci_softc *scp = device_get_softc(dev);
160 error = xenpci_allocate_resources(dev);
162 device_printf(dev, "xenpci_allocate_resources failed(%d).\n",
168 * Hook the irq up to evtchn
170 error = xenpci_irq_init(dev, scp);
172 device_printf(dev, "xenpci_irq_init failed(%d).\n",
181 * Undo anything we may have done.
183 xenpci_deallocate_resources(dev);
188 * Detach - reverse anything done by attach.
191 xenpci_detach(device_t dev)
193 struct xenpci_softc *scp = device_get_softc(dev);
194 device_t parent = device_get_parent(dev);
197 * Take our interrupt handler out of the list of handlers
198 * that can handle this irq.
200 if (scp->intr_cookie != NULL) {
201 if (BUS_TEARDOWN_INTR(parent, dev,
202 scp->res_irq, scp->intr_cookie) != 0)
204 "intr teardown failed.. continuing\n");
205 scp->intr_cookie = NULL;
209 * Deallocate any system resources we may have
210 * allocated on behalf of this driver.
212 return (xenpci_deallocate_resources(dev));
216 xenpci_resume(device_t dev)
218 xen_hvm_set_callback(dev);
222 static device_method_t xenpci_methods[] = {
223 /* Device interface */
224 DEVMETHOD(device_probe, xenpci_probe),
225 DEVMETHOD(device_attach, xenpci_attach),
226 DEVMETHOD(device_detach, xenpci_detach),
227 DEVMETHOD(device_resume, xenpci_resume),
232 static driver_t xenpci_driver = {
235 sizeof(struct xenpci_softc),
238 DRIVER_MODULE(xenpci, pci, xenpci_driver, xenpci_devclass, 0, 0);