1 /******************************************************************************
2 * platform-pci-unplug.c
4 * Xen platform PCI device driver
5 * Copyright (c) 2010, Citrix
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms and conditions of the GNU General Public License,
9 * version 2, as published by the Free Software Foundation.
11 * This program is distributed in the hope it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
18 * Place - Suite 330, Boston, MA 02111-1307 USA.
22 #include <linux/init.h>
24 #include <linux/module.h>
26 #include <xen/platform_pci.h>
28 #define XEN_PLATFORM_ERR_MAGIC -1
29 #define XEN_PLATFORM_ERR_PROTOCOL -2
30 #define XEN_PLATFORM_ERR_BLACKLIST -3
32 /* store the value of xen_emul_unplug after the unplug is done */
33 int xen_platform_pci_unplug;
34 EXPORT_SYMBOL_GPL(xen_platform_pci_unplug);
35 #ifdef CONFIG_XEN_PVHVM
36 static int xen_emul_unplug;
38 static int __init check_platform_magic(void)
43 magic = inw(XEN_IOPORT_MAGIC);
44 if (magic != XEN_IOPORT_MAGIC_VAL) {
45 printk(KERN_ERR "Xen Platform PCI: unrecognised magic value\n");
46 return XEN_PLATFORM_ERR_MAGIC;
49 protocol = inb(XEN_IOPORT_PROTOVER);
51 printk(KERN_DEBUG "Xen Platform PCI: I/O protocol version %d\n",
56 outw(XEN_IOPORT_LINUX_PRODNUM, XEN_IOPORT_PRODNUM);
57 outl(XEN_IOPORT_LINUX_DRVVER, XEN_IOPORT_DRVVER);
58 if (inw(XEN_IOPORT_MAGIC) != XEN_IOPORT_MAGIC_VAL) {
59 printk(KERN_ERR "Xen Platform: blacklisted by host\n");
60 return XEN_PLATFORM_ERR_BLACKLIST;
64 printk(KERN_WARNING "Xen Platform PCI: unknown I/O protocol version");
65 return XEN_PLATFORM_ERR_PROTOCOL;
71 void __init xen_unplug_emulated_devices(void)
75 /* check the version of the xen platform PCI device */
76 r = check_platform_magic();
77 /* If the version matches enable the Xen platform PCI driver.
78 * Also enable the Xen platform PCI driver if the version is really old
79 * and the user told us to ignore it. */
80 if (r && !(r == XEN_PLATFORM_ERR_MAGIC &&
81 (xen_emul_unplug & XEN_UNPLUG_IGNORE)))
83 /* Set the default value of xen_emul_unplug depending on whether or
84 * not the Xen PV frontends and the Xen platform PCI driver have
85 * been compiled for this kernel (modules or built-in are both OK). */
86 if (!xen_emul_unplug) {
87 if (xen_must_unplug_nics()) {
88 printk(KERN_INFO "Netfront and the Xen platform PCI driver have "
89 "been compiled for this kernel: unplug emulated NICs.\n");
90 xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
92 if (xen_must_unplug_disks()) {
93 printk(KERN_INFO "Blkfront and the Xen platform PCI driver have "
94 "been compiled for this kernel: unplug emulated disks.\n"
95 "You might have to change the root device\n"
96 "from /dev/hd[a-d] to /dev/xvd[a-d]\n"
97 "in your root= kernel command line option\n");
98 xen_emul_unplug |= XEN_UNPLUG_ALL_IDE_DISKS;
101 /* Now unplug the emulated devices */
102 if (!(xen_emul_unplug & XEN_UNPLUG_IGNORE))
103 outw(xen_emul_unplug, XEN_IOPORT_UNPLUG);
104 xen_platform_pci_unplug = xen_emul_unplug;
107 static int __init parse_xen_emul_unplug(char *arg)
112 for (p = arg; p; p = q) {
120 if (!strncmp(p, "all", l))
121 xen_emul_unplug |= XEN_UNPLUG_ALL;
122 else if (!strncmp(p, "ide-disks", l))
123 xen_emul_unplug |= XEN_UNPLUG_ALL_IDE_DISKS;
124 else if (!strncmp(p, "aux-ide-disks", l))
125 xen_emul_unplug |= XEN_UNPLUG_AUX_IDE_DISKS;
126 else if (!strncmp(p, "nics", l))
127 xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
128 else if (!strncmp(p, "ignore", l))
129 xen_emul_unplug |= XEN_UNPLUG_IGNORE;
131 printk(KERN_WARNING "unrecognised option '%s' "
132 "in parameter 'xen_emul_unplug'\n", p);
136 early_param("xen_emul_unplug", parse_xen_emul_unplug);