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22#include <linux/init.h>
23#include <linux/io.h>
24#include <linux/export.h>
25
26#include <xen/platform_pci.h>
27#include "xen-ops.h"
28
29#define XEN_PLATFORM_ERR_MAGIC -1
30#define XEN_PLATFORM_ERR_PROTOCOL -2
31#define XEN_PLATFORM_ERR_BLACKLIST -3
32
33#ifdef CONFIG_XEN_PVHVM
34
35static int xen_platform_pci_unplug;
36static int xen_emul_unplug;
37
38static int check_platform_magic(void)
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\n");
65 return XEN_PLATFORM_ERR_PROTOCOL;
66 }
67
68 return 0;
69}
70
71bool xen_has_pv_devices(void)
72{
73 if (!xen_domain())
74 return false;
75
76
77 if (xen_pv_domain())
78 return true;
79
80
81
82 if (xen_platform_pci_unplug == 0)
83 return false;
84
85 if (xen_platform_pci_unplug & XEN_UNPLUG_NEVER)
86 return false;
87
88 if (xen_platform_pci_unplug & XEN_UNPLUG_ALL)
89 return true;
90
91
92
93 if (xen_platform_pci_unplug & XEN_UNPLUG_UNNECESSARY)
94 return true;
95
96
97
98 return false;
99}
100EXPORT_SYMBOL_GPL(xen_has_pv_devices);
101
102static bool __xen_has_pv_device(int state)
103{
104
105 if (xen_hvm_domain() && (xen_platform_pci_unplug & state))
106 return true;
107
108 return xen_has_pv_devices();
109}
110
111bool xen_has_pv_nic_devices(void)
112{
113 return __xen_has_pv_device(XEN_UNPLUG_ALL_NICS | XEN_UNPLUG_ALL);
114}
115EXPORT_SYMBOL_GPL(xen_has_pv_nic_devices);
116
117bool xen_has_pv_disk_devices(void)
118{
119 return __xen_has_pv_device(XEN_UNPLUG_ALL_IDE_DISKS |
120 XEN_UNPLUG_AUX_IDE_DISKS | XEN_UNPLUG_ALL);
121}
122EXPORT_SYMBOL_GPL(xen_has_pv_disk_devices);
123
124
125
126
127
128
129bool xen_has_pv_and_legacy_disk_devices(void)
130{
131 if (!xen_domain())
132 return false;
133
134
135 if (xen_pv_domain())
136 return false;
137
138 if (xen_platform_pci_unplug & XEN_UNPLUG_UNNECESSARY)
139 return true;
140
141 return false;
142}
143EXPORT_SYMBOL_GPL(xen_has_pv_and_legacy_disk_devices);
144
145void xen_unplug_emulated_devices(void)
146{
147 int r;
148
149
150 if (xen_emul_unplug & XEN_UNPLUG_NEVER)
151 return;
152
153 r = check_platform_magic();
154
155
156
157
158 if (r && !(r == XEN_PLATFORM_ERR_MAGIC &&
159 (xen_emul_unplug & XEN_UNPLUG_UNNECESSARY)))
160 return;
161
162
163
164 if (!xen_emul_unplug) {
165 if (xen_must_unplug_nics()) {
166 printk(KERN_INFO "Netfront and the Xen platform PCI driver have "
167 "been compiled for this kernel: unplug emulated NICs.\n");
168 xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
169 }
170 if (xen_must_unplug_disks()) {
171 printk(KERN_INFO "Blkfront and the Xen platform PCI driver have "
172 "been compiled for this kernel: unplug emulated disks.\n"
173 "You might have to change the root device\n"
174 "from /dev/hd[a-d] to /dev/xvd[a-d]\n"
175 "in your root= kernel command line option\n");
176 xen_emul_unplug |= XEN_UNPLUG_ALL_IDE_DISKS;
177 }
178 }
179
180 if (!(xen_emul_unplug & XEN_UNPLUG_UNNECESSARY))
181 outw(xen_emul_unplug, XEN_IOPORT_UNPLUG);
182 xen_platform_pci_unplug = xen_emul_unplug;
183}
184
185static int __init parse_xen_emul_unplug(char *arg)
186{
187 char *p, *q;
188 int l;
189
190 for (p = arg; p; p = q) {
191 q = strchr(p, ',');
192 if (q) {
193 l = q - p;
194 q++;
195 } else {
196 l = strlen(p);
197 }
198 if (!strncmp(p, "all", l))
199 xen_emul_unplug |= XEN_UNPLUG_ALL;
200 else if (!strncmp(p, "ide-disks", l))
201 xen_emul_unplug |= XEN_UNPLUG_ALL_IDE_DISKS;
202 else if (!strncmp(p, "aux-ide-disks", l))
203 xen_emul_unplug |= XEN_UNPLUG_AUX_IDE_DISKS;
204 else if (!strncmp(p, "nics", l))
205 xen_emul_unplug |= XEN_UNPLUG_ALL_NICS;
206 else if (!strncmp(p, "unnecessary", l))
207 xen_emul_unplug |= XEN_UNPLUG_UNNECESSARY;
208 else if (!strncmp(p, "never", l))
209 xen_emul_unplug |= XEN_UNPLUG_NEVER;
210 else
211 printk(KERN_WARNING "unrecognised option '%s' "
212 "in parameter 'xen_emul_unplug'\n", p);
213 }
214 return 0;
215}
216early_param("xen_emul_unplug", parse_xen_emul_unplug);
217#endif
218