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c1c5413a SS |
1 | /****************************************************************************** |
2 | * platform-pci-unplug.c | |
3 | * | |
4 | * Xen platform PCI device driver | |
5 | * Copyright (c) 2010, Citrix | |
6 | * | |
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. | |
10 | * | |
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 | |
14 | * more details. | |
15 | * | |
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. | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <linux/init.h> | |
23 | #include <linux/io.h> | |
24 | #include <linux/module.h> | |
25 | ||
26 | #include <xen/platform_pci.h> | |
27 | ||
28 | #define XEN_PLATFORM_ERR_MAGIC -1 | |
29 | #define XEN_PLATFORM_ERR_PROTOCOL -2 | |
30 | #define XEN_PLATFORM_ERR_BLACKLIST -3 | |
31 | ||
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); | |
ca65f9fc | 35 | #ifdef CONFIG_XEN_PVHVM |
c1c5413a SS |
36 | static int xen_emul_unplug; |
37 | ||
3c52b7bf | 38 | static int check_platform_magic(void) |
c1c5413a SS |
39 | { |
40 | short magic; | |
41 | char protocol; | |
42 | ||
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; | |
47 | } | |
48 | ||
49 | protocol = inb(XEN_IOPORT_PROTOVER); | |
50 | ||
51 | printk(KERN_DEBUG "Xen Platform PCI: I/O protocol version %d\n", | |
52 | protocol); | |
53 | ||
54 | switch (protocol) { | |
55 | case 1: | |
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; | |
61 | } | |
62 | break; | |
63 | default: | |
64 | printk(KERN_WARNING "Xen Platform PCI: unknown I/O protocol version"); | |
65 | return XEN_PLATFORM_ERR_PROTOCOL; | |
66 | } | |
67 | ||
68 | return 0; | |
69 | } | |
70 | ||
512b109e | 71 | void xen_unplug_emulated_devices(void) |
c1c5413a SS |
72 | { |
73 | int r; | |
74 | ||
c93a4dfb IC |
75 | /* user explicitly requested no unplug */ |
76 | if (xen_emul_unplug & XEN_UNPLUG_NEVER) | |
77 | return; | |
c1c5413a SS |
78 | /* check the version of the xen platform PCI device */ |
79 | r = check_platform_magic(); | |
80 | /* If the version matches enable the Xen platform PCI driver. | |
1dc7ce99 IC |
81 | * Also enable the Xen platform PCI driver if the host does |
82 | * not support the unplug protocol (XEN_PLATFORM_ERR_MAGIC) | |
83 | * but the user told us that unplugging is unnecessary. */ | |
c1c5413a | 84 | if (r && !(r == XEN_PLATFORM_ERR_MAGIC && |
1dc7ce99 | 85 | (xen_emul_unplug & XEN_UNPLUG_UNNECESSARY))) |
c1c5413a SS |
86 | return; |
87 | /* Set the default value of xen_emul_unplug depending on whether or | |
88 | * not the Xen PV frontends and the Xen platform PCI driver have | |
89 | * been compiled for this kernel (modules or built-in are both OK). */ | |
90 | if (!xen_emul_unplug) { | |
91 | if (xen_must_unplug_nics()) { | |
92 | printk(KERN_INFO "Netfront and the Xen platform PCI driver have " | |
93 | "been compiled for this kernel: unplug emulated NICs.\n"); | |
94 | xen_emul_unplug |= XEN_UNPLUG_ALL_NICS; | |
95 | } | |
96 | if (xen_must_unplug_disks()) { | |
97 | printk(KERN_INFO "Blkfront and the Xen platform PCI driver have " | |
98 | "been compiled for this kernel: unplug emulated disks.\n" | |
99 | "You might have to change the root device\n" | |
100 | "from /dev/hd[a-d] to /dev/xvd[a-d]\n" | |
101 | "in your root= kernel command line option\n"); | |
102 | xen_emul_unplug |= XEN_UNPLUG_ALL_IDE_DISKS; | |
103 | } | |
104 | } | |
105 | /* Now unplug the emulated devices */ | |
1dc7ce99 | 106 | if (!(xen_emul_unplug & XEN_UNPLUG_UNNECESSARY)) |
c1c5413a SS |
107 | outw(xen_emul_unplug, XEN_IOPORT_UNPLUG); |
108 | xen_platform_pci_unplug = xen_emul_unplug; | |
109 | } | |
110 | ||
111 | static int __init parse_xen_emul_unplug(char *arg) | |
112 | { | |
113 | char *p, *q; | |
114 | int l; | |
115 | ||
116 | for (p = arg; p; p = q) { | |
117 | q = strchr(p, ','); | |
118 | if (q) { | |
119 | l = q - p; | |
120 | q++; | |
121 | } else { | |
122 | l = strlen(p); | |
123 | } | |
124 | if (!strncmp(p, "all", l)) | |
125 | xen_emul_unplug |= XEN_UNPLUG_ALL; | |
126 | else if (!strncmp(p, "ide-disks", l)) | |
127 | xen_emul_unplug |= XEN_UNPLUG_ALL_IDE_DISKS; | |
128 | else if (!strncmp(p, "aux-ide-disks", l)) | |
129 | xen_emul_unplug |= XEN_UNPLUG_AUX_IDE_DISKS; | |
130 | else if (!strncmp(p, "nics", l)) | |
131 | xen_emul_unplug |= XEN_UNPLUG_ALL_NICS; | |
1dc7ce99 IC |
132 | else if (!strncmp(p, "unnecessary", l)) |
133 | xen_emul_unplug |= XEN_UNPLUG_UNNECESSARY; | |
c93a4dfb IC |
134 | else if (!strncmp(p, "never", l)) |
135 | xen_emul_unplug |= XEN_UNPLUG_NEVER; | |
c1c5413a SS |
136 | else |
137 | printk(KERN_WARNING "unrecognised option '%s' " | |
138 | "in parameter 'xen_emul_unplug'\n", p); | |
139 | } | |
140 | return 0; | |
141 | } | |
142 | early_param("xen_emul_unplug", parse_xen_emul_unplug); | |
ca65f9fc | 143 | #endif |