xen_pci_bus.c revision 272310 
1/*
2 * Copyright (c) 2014 Roger Pau Monn�� <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: head/sys/x86/xen/xen_pci.c 272310 2014-09-30 16:46:45Z royger $");
29
30#include <sys/param.h>
31#include <sys/systm.h>
32#include <sys/bus.h>
33#include <sys/kernel.h>
34#include <sys/malloc.h>
35#include <sys/module.h>
36
37#include <sys/pciio.h>
38#include <dev/pci/pcireg.h>
39#include <dev/pci/pcivar.h>
40#include <dev/pci/pci_private.h>
41
42#include <xen/xen-os.h>
43
44#include "pcib_if.h"
45#include "pci_if.h"
46
47static int xen_pci_probe(device_t dev);
48
49static void xen_pci_enable_msi_method(device_t dev, device_t child,
50    uint64_t address, uint16_t data);
51static void xen_pci_disable_msi_method(device_t dev, device_t child);
52
53static device_method_t xen_pci_methods[] = {
54	/* Device interface */
55	DEVMETHOD(device_probe,		xen_pci_probe),
56
57	/* PCI interface overwrites */
58	DEVMETHOD(pci_enable_msi,	xen_pci_enable_msi_method),
59	DEVMETHOD(pci_disable_msi,	xen_pci_disable_msi_method),
60
61	DEVMETHOD_END
62};
63
64static devclass_t pci_devclass;
65
66DECLARE_CLASS(acpi_pci_driver);
67DEFINE_CLASS_1(pci, xen_pci_driver, xen_pci_methods, sizeof(struct pci_softc),
68    acpi_pci_driver);
69DRIVER_MODULE(xen_pci, pcib, xen_pci_driver, pci_devclass, 0, 0);
70MODULE_DEPEND(xen_pci, pci, 1, 1, 1);
71MODULE_DEPEND(xen_pci, acpi, 1, 1, 1);
72MODULE_VERSION(xen_pci, 1);
73
74static int
75xen_pci_probe(device_t dev)
76{
77
78	device_set_desc(dev, "Xen PCI bus");
79
80	if (!xen_pv_domain())
81		return (ENXIO);
82
83	return (BUS_PROBE_SPECIFIC);
84}
85
86static void
87xen_pci_enable_msi_method(device_t dev, device_t child, uint64_t address,
88     uint16_t data)
89{
90	struct pci_devinfo *dinfo = device_get_ivars(child);
91	struct pcicfg_msi *msi = &dinfo->cfg.msi;
92
93	/* Enable MSI in the control register. */
94	msi->msi_ctrl |= PCIM_MSICTRL_MSI_ENABLE;
95	pci_write_config(child, msi->msi_location + PCIR_MSI_CTRL,
96	    msi->msi_ctrl, 2);
97}
98
99static void
100xen_pci_disable_msi_method(device_t dev, device_t child)
101{
102	struct pci_devinfo *dinfo = device_get_ivars(child);
103	struct pcicfg_msi *msi = &dinfo->cfg.msi;
104
105	msi->msi_ctrl &= ~PCIM_MSICTRL_MSI_ENABLE;
106	pci_write_config(child, msi->msi_location + PCIR_MSI_CTRL,
107	    msi->msi_ctrl, 2);
108}
109