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1 | d94f9486 | aliguori | /*
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2 | d94f9486 | aliguori | * xen backend driver infrastructure
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3 | d94f9486 | aliguori | * (c) 2008 Gerd Hoffmann <kraxel@redhat.com>
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4 | d94f9486 | aliguori | *
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5 | d94f9486 | aliguori | * This program is free software; you can redistribute it and/or modify
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6 | d94f9486 | aliguori | * it under the terms of the GNU General Public License as published by
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7 | d94f9486 | aliguori | * the Free Software Foundation; under version 2 of the License.
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8 | d94f9486 | aliguori | *
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9 | d94f9486 | aliguori | * This program is distributed in the hope that it will be useful,
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10 | d94f9486 | aliguori | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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11 | d94f9486 | aliguori | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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12 | d94f9486 | aliguori | * GNU General Public License for more details.
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13 | d94f9486 | aliguori | *
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14 | d94f9486 | aliguori | * You should have received a copy of the GNU General Public License along
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15 | 8167ee88 | Blue Swirl | * with this program; if not, see <http://www.gnu.org/licenses/>.
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16 | 6b620ca3 | Paolo Bonzini | *
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17 | 6b620ca3 | Paolo Bonzini | * Contributions after 2012-01-13 are licensed under the terms of the
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18 | 6b620ca3 | Paolo Bonzini | * GNU GPL, version 2 or (at your option) any later version.
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19 | d94f9486 | aliguori | */
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20 | d94f9486 | aliguori | |
21 | d94f9486 | aliguori | /*
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22 | d94f9486 | aliguori | * TODO: add some xenbus / xenstore concepts overview here.
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23 | d94f9486 | aliguori | */
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24 | d94f9486 | aliguori | |
25 | d94f9486 | aliguori | #include <stdio.h> |
26 | d94f9486 | aliguori | #include <stdlib.h> |
27 | d94f9486 | aliguori | #include <stdarg.h> |
28 | d94f9486 | aliguori | #include <string.h> |
29 | d94f9486 | aliguori | #include <unistd.h> |
30 | d94f9486 | aliguori | #include <fcntl.h> |
31 | d94f9486 | aliguori | #include <inttypes.h> |
32 | d94f9486 | aliguori | #include <sys/types.h> |
33 | d94f9486 | aliguori | #include <sys/stat.h> |
34 | d94f9486 | aliguori | #include <sys/mman.h> |
35 | d94f9486 | aliguori | #include <sys/signal.h> |
36 | d94f9486 | aliguori | |
37 | d94f9486 | aliguori | #include "hw.h" |
38 | 927d4878 | Paolo Bonzini | #include "char/char.h" |
39 | 1de7afc9 | Paolo Bonzini | #include "qemu/log.h" |
40 | d94f9486 | aliguori | #include "xen_backend.h" |
41 | d94f9486 | aliguori | |
42 | b41f6719 | Anthony PERARD | #include <xen/grant_table.h> |
43 | b41f6719 | Anthony PERARD | |
44 | d94f9486 | aliguori | /* ------------------------------------------------------------- */
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45 | d94f9486 | aliguori | |
46 | d94f9486 | aliguori | /* public */
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47 | d5b93ddf | Anthony PERARD | XenXC xen_xc = XC_HANDLER_INITIAL_VALUE; |
48 | d5b93ddf | Anthony PERARD | XenGnttab xen_xcg = XC_HANDLER_INITIAL_VALUE; |
49 | d94f9486 | aliguori | struct xs_handle *xenstore = NULL; |
50 | 2c8b24a3 | aliguori | const char *xen_protocol; |
51 | d94f9486 | aliguori | |
52 | d94f9486 | aliguori | /* private */
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53 | 72cf2d4f | Blue Swirl | static QTAILQ_HEAD(XenDeviceHead, XenDevice) xendevs = QTAILQ_HEAD_INITIALIZER(xendevs);
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54 | d94f9486 | aliguori | static int debug = 0; |
55 | d94f9486 | aliguori | |
56 | d94f9486 | aliguori | /* ------------------------------------------------------------- */
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57 | d94f9486 | aliguori | |
58 | d94f9486 | aliguori | int xenstore_write_str(const char *base, const char *node, const char *val) |
59 | d94f9486 | aliguori | { |
60 | d94f9486 | aliguori | char abspath[XEN_BUFSIZE];
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61 | d94f9486 | aliguori | |
62 | d94f9486 | aliguori | snprintf(abspath, sizeof(abspath), "%s/%s", base, node); |
63 | 209cd7ab | Anthony PERARD | if (!xs_write(xenstore, 0, abspath, val, strlen(val))) { |
64 | 209cd7ab | Anthony PERARD | return -1; |
65 | 209cd7ab | Anthony PERARD | } |
66 | d94f9486 | aliguori | return 0; |
67 | d94f9486 | aliguori | } |
68 | d94f9486 | aliguori | |
69 | d94f9486 | aliguori | char *xenstore_read_str(const char *base, const char *node) |
70 | d94f9486 | aliguori | { |
71 | d94f9486 | aliguori | char abspath[XEN_BUFSIZE];
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72 | d94f9486 | aliguori | unsigned int len; |
73 | d94f9486 | aliguori | char *str, *ret = NULL; |
74 | d94f9486 | aliguori | |
75 | d94f9486 | aliguori | snprintf(abspath, sizeof(abspath), "%s/%s", base, node); |
76 | d94f9486 | aliguori | str = xs_read(xenstore, 0, abspath, &len);
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77 | d94f9486 | aliguori | if (str != NULL) { |
78 | d94f9486 | aliguori | /* move to qemu-allocated memory to make sure
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79 | 7267c094 | Anthony Liguori | * callers can savely g_free() stuff. */
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80 | 7267c094 | Anthony Liguori | ret = g_strdup(str); |
81 | d94f9486 | aliguori | free(str); |
82 | d94f9486 | aliguori | } |
83 | d94f9486 | aliguori | return ret;
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84 | d94f9486 | aliguori | } |
85 | d94f9486 | aliguori | |
86 | d94f9486 | aliguori | int xenstore_write_int(const char *base, const char *node, int ival) |
87 | d94f9486 | aliguori | { |
88 | d94f9486 | aliguori | char val[32]; |
89 | d94f9486 | aliguori | |
90 | d94f9486 | aliguori | snprintf(val, sizeof(val), "%d", ival); |
91 | d94f9486 | aliguori | return xenstore_write_str(base, node, val);
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92 | d94f9486 | aliguori | } |
93 | d94f9486 | aliguori | |
94 | d94f9486 | aliguori | int xenstore_read_int(const char *base, const char *node, int *ival) |
95 | d94f9486 | aliguori | { |
96 | d94f9486 | aliguori | char *val;
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97 | d94f9486 | aliguori | int rc = -1; |
98 | d94f9486 | aliguori | |
99 | d94f9486 | aliguori | val = xenstore_read_str(base, node); |
100 | 209cd7ab | Anthony PERARD | if (val && 1 == sscanf(val, "%d", ival)) { |
101 | 209cd7ab | Anthony PERARD | rc = 0;
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102 | 209cd7ab | Anthony PERARD | } |
103 | 7267c094 | Anthony Liguori | g_free(val); |
104 | d94f9486 | aliguori | return rc;
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105 | d94f9486 | aliguori | } |
106 | d94f9486 | aliguori | |
107 | d94f9486 | aliguori | int xenstore_write_be_str(struct XenDevice *xendev, const char *node, const char *val) |
108 | d94f9486 | aliguori | { |
109 | d94f9486 | aliguori | return xenstore_write_str(xendev->be, node, val);
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110 | d94f9486 | aliguori | } |
111 | d94f9486 | aliguori | |
112 | d94f9486 | aliguori | int xenstore_write_be_int(struct XenDevice *xendev, const char *node, int ival) |
113 | d94f9486 | aliguori | { |
114 | d94f9486 | aliguori | return xenstore_write_int(xendev->be, node, ival);
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115 | d94f9486 | aliguori | } |
116 | d94f9486 | aliguori | |
117 | d94f9486 | aliguori | char *xenstore_read_be_str(struct XenDevice *xendev, const char *node) |
118 | d94f9486 | aliguori | { |
119 | d94f9486 | aliguori | return xenstore_read_str(xendev->be, node);
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120 | d94f9486 | aliguori | } |
121 | d94f9486 | aliguori | |
122 | d94f9486 | aliguori | int xenstore_read_be_int(struct XenDevice *xendev, const char *node, int *ival) |
123 | d94f9486 | aliguori | { |
124 | d94f9486 | aliguori | return xenstore_read_int(xendev->be, node, ival);
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125 | d94f9486 | aliguori | } |
126 | d94f9486 | aliguori | |
127 | d94f9486 | aliguori | char *xenstore_read_fe_str(struct XenDevice *xendev, const char *node) |
128 | d94f9486 | aliguori | { |
129 | d94f9486 | aliguori | return xenstore_read_str(xendev->fe, node);
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130 | d94f9486 | aliguori | } |
131 | d94f9486 | aliguori | |
132 | d94f9486 | aliguori | int xenstore_read_fe_int(struct XenDevice *xendev, const char *node, int *ival) |
133 | d94f9486 | aliguori | { |
134 | d94f9486 | aliguori | return xenstore_read_int(xendev->fe, node, ival);
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135 | d94f9486 | aliguori | } |
136 | d94f9486 | aliguori | |
137 | d94f9486 | aliguori | /* ------------------------------------------------------------- */
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138 | d94f9486 | aliguori | |
139 | d94f9486 | aliguori | const char *xenbus_strstate(enum xenbus_state state) |
140 | d94f9486 | aliguori | { |
141 | 209cd7ab | Anthony PERARD | static const char *const name[] = { |
142 | 209cd7ab | Anthony PERARD | [ XenbusStateUnknown ] = "Unknown",
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143 | 209cd7ab | Anthony PERARD | [ XenbusStateInitialising ] = "Initialising",
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144 | 209cd7ab | Anthony PERARD | [ XenbusStateInitWait ] = "InitWait",
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145 | 209cd7ab | Anthony PERARD | [ XenbusStateInitialised ] = "Initialised",
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146 | 209cd7ab | Anthony PERARD | [ XenbusStateConnected ] = "Connected",
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147 | 209cd7ab | Anthony PERARD | [ XenbusStateClosing ] = "Closing",
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148 | 209cd7ab | Anthony PERARD | [ XenbusStateClosed ] = "Closed",
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149 | 209cd7ab | Anthony PERARD | }; |
150 | 209cd7ab | Anthony PERARD | return (state < ARRAY_SIZE(name)) ? name[state] : "INVALID"; |
151 | d94f9486 | aliguori | } |
152 | d94f9486 | aliguori | |
153 | d94f9486 | aliguori | int xen_be_set_state(struct XenDevice *xendev, enum xenbus_state state) |
154 | d94f9486 | aliguori | { |
155 | d94f9486 | aliguori | int rc;
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156 | d94f9486 | aliguori | |
157 | d94f9486 | aliguori | rc = xenstore_write_be_int(xendev, "state", state);
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158 | 209cd7ab | Anthony PERARD | if (rc < 0) { |
159 | 209cd7ab | Anthony PERARD | return rc;
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160 | 209cd7ab | Anthony PERARD | } |
161 | d94f9486 | aliguori | xen_be_printf(xendev, 1, "backend state: %s -> %s\n", |
162 | 209cd7ab | Anthony PERARD | xenbus_strstate(xendev->be_state), xenbus_strstate(state)); |
163 | d94f9486 | aliguori | xendev->be_state = state; |
164 | d94f9486 | aliguori | return 0; |
165 | d94f9486 | aliguori | } |
166 | d94f9486 | aliguori | |
167 | d94f9486 | aliguori | /* ------------------------------------------------------------- */
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168 | d94f9486 | aliguori | |
169 | d94f9486 | aliguori | struct XenDevice *xen_be_find_xendev(const char *type, int dom, int dev) |
170 | d94f9486 | aliguori | { |
171 | d94f9486 | aliguori | struct XenDevice *xendev;
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172 | d94f9486 | aliguori | |
173 | 72cf2d4f | Blue Swirl | QTAILQ_FOREACH(xendev, &xendevs, next) { |
174 | 209cd7ab | Anthony PERARD | if (xendev->dom != dom) {
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175 | 209cd7ab | Anthony PERARD | continue;
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176 | 209cd7ab | Anthony PERARD | } |
177 | 209cd7ab | Anthony PERARD | if (xendev->dev != dev) {
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178 | 209cd7ab | Anthony PERARD | continue;
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179 | 209cd7ab | Anthony PERARD | } |
180 | 209cd7ab | Anthony PERARD | if (strcmp(xendev->type, type) != 0) { |
181 | 209cd7ab | Anthony PERARD | continue;
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182 | 209cd7ab | Anthony PERARD | } |
183 | 209cd7ab | Anthony PERARD | return xendev;
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184 | d94f9486 | aliguori | } |
185 | d94f9486 | aliguori | return NULL; |
186 | d94f9486 | aliguori | } |
187 | d94f9486 | aliguori | |
188 | d94f9486 | aliguori | /*
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189 | d94f9486 | aliguori | * get xen backend device, allocate a new one if it doesn't exist.
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190 | d94f9486 | aliguori | */
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191 | d94f9486 | aliguori | static struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev, |
192 | d94f9486 | aliguori | struct XenDevOps *ops)
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193 | d94f9486 | aliguori | { |
194 | d94f9486 | aliguori | struct XenDevice *xendev;
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195 | d94f9486 | aliguori | char *dom0;
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196 | d94f9486 | aliguori | |
197 | d94f9486 | aliguori | xendev = xen_be_find_xendev(type, dom, dev); |
198 | 209cd7ab | Anthony PERARD | if (xendev) {
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199 | 209cd7ab | Anthony PERARD | return xendev;
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200 | 209cd7ab | Anthony PERARD | } |
201 | d94f9486 | aliguori | |
202 | d94f9486 | aliguori | /* init new xendev */
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203 | 7267c094 | Anthony Liguori | xendev = g_malloc0(ops->size); |
204 | d94f9486 | aliguori | xendev->type = type; |
205 | d94f9486 | aliguori | xendev->dom = dom; |
206 | d94f9486 | aliguori | xendev->dev = dev; |
207 | d94f9486 | aliguori | xendev->ops = ops; |
208 | d94f9486 | aliguori | |
209 | d94f9486 | aliguori | dom0 = xs_get_domain_path(xenstore, 0);
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210 | d94f9486 | aliguori | snprintf(xendev->be, sizeof(xendev->be), "%s/backend/%s/%d/%d", |
211 | 209cd7ab | Anthony PERARD | dom0, xendev->type, xendev->dom, xendev->dev); |
212 | d94f9486 | aliguori | snprintf(xendev->name, sizeof(xendev->name), "%s-%d", |
213 | 209cd7ab | Anthony PERARD | xendev->type, xendev->dev); |
214 | d94f9486 | aliguori | free(dom0); |
215 | d94f9486 | aliguori | |
216 | d94f9486 | aliguori | xendev->debug = debug; |
217 | d94f9486 | aliguori | xendev->local_port = -1;
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218 | d94f9486 | aliguori | |
219 | d5b93ddf | Anthony PERARD | xendev->evtchndev = xen_xc_evtchn_open(NULL, 0); |
220 | d5b93ddf | Anthony PERARD | if (xendev->evtchndev == XC_HANDLER_INITIAL_VALUE) {
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221 | 209cd7ab | Anthony PERARD | xen_be_printf(NULL, 0, "can't open evtchn device\n"); |
222 | 7267c094 | Anthony Liguori | g_free(xendev); |
223 | 209cd7ab | Anthony PERARD | return NULL; |
224 | d94f9486 | aliguori | } |
225 | d94f9486 | aliguori | fcntl(xc_evtchn_fd(xendev->evtchndev), F_SETFD, FD_CLOEXEC); |
226 | d94f9486 | aliguori | |
227 | d94f9486 | aliguori | if (ops->flags & DEVOPS_FLAG_NEED_GNTDEV) {
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228 | d5b93ddf | Anthony PERARD | xendev->gnttabdev = xen_xc_gnttab_open(NULL, 0); |
229 | d5b93ddf | Anthony PERARD | if (xendev->gnttabdev == XC_HANDLER_INITIAL_VALUE) {
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230 | 209cd7ab | Anthony PERARD | xen_be_printf(NULL, 0, "can't open gnttab device\n"); |
231 | 209cd7ab | Anthony PERARD | xc_evtchn_close(xendev->evtchndev); |
232 | 7267c094 | Anthony Liguori | g_free(xendev); |
233 | 209cd7ab | Anthony PERARD | return NULL; |
234 | 209cd7ab | Anthony PERARD | } |
235 | d94f9486 | aliguori | } else {
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236 | d5b93ddf | Anthony PERARD | xendev->gnttabdev = XC_HANDLER_INITIAL_VALUE; |
237 | d94f9486 | aliguori | } |
238 | d94f9486 | aliguori | |
239 | 72cf2d4f | Blue Swirl | QTAILQ_INSERT_TAIL(&xendevs, xendev, next); |
240 | d94f9486 | aliguori | |
241 | 209cd7ab | Anthony PERARD | if (xendev->ops->alloc) {
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242 | 209cd7ab | Anthony PERARD | xendev->ops->alloc(xendev); |
243 | 209cd7ab | Anthony PERARD | } |
244 | d94f9486 | aliguori | |
245 | d94f9486 | aliguori | return xendev;
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246 | d94f9486 | aliguori | } |
247 | d94f9486 | aliguori | |
248 | d94f9486 | aliguori | /*
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249 | d94f9486 | aliguori | * release xen backend device.
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250 | d94f9486 | aliguori | */
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251 | d94f9486 | aliguori | static struct XenDevice *xen_be_del_xendev(int dom, int dev) |
252 | d94f9486 | aliguori | { |
253 | d94f9486 | aliguori | struct XenDevice *xendev, *xnext;
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254 | d94f9486 | aliguori | |
255 | d94f9486 | aliguori | /*
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256 | 72cf2d4f | Blue Swirl | * This is pretty much like QTAILQ_FOREACH(xendev, &xendevs, next) but
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257 | d94f9486 | aliguori | * we save the next pointer in xnext because we might free xendev.
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258 | d94f9486 | aliguori | */
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259 | d94f9486 | aliguori | xnext = xendevs.tqh_first; |
260 | d94f9486 | aliguori | while (xnext) {
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261 | d94f9486 | aliguori | xendev = xnext; |
262 | d94f9486 | aliguori | xnext = xendev->next.tqe_next; |
263 | d94f9486 | aliguori | |
264 | 209cd7ab | Anthony PERARD | if (xendev->dom != dom) {
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265 | 209cd7ab | Anthony PERARD | continue;
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266 | 209cd7ab | Anthony PERARD | } |
267 | 209cd7ab | Anthony PERARD | if (xendev->dev != dev && dev != -1) { |
268 | 209cd7ab | Anthony PERARD | continue;
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269 | 209cd7ab | Anthony PERARD | } |
270 | 209cd7ab | Anthony PERARD | |
271 | 209cd7ab | Anthony PERARD | if (xendev->ops->free) {
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272 | 209cd7ab | Anthony PERARD | xendev->ops->free(xendev); |
273 | 209cd7ab | Anthony PERARD | } |
274 | 209cd7ab | Anthony PERARD | |
275 | 209cd7ab | Anthony PERARD | if (xendev->fe) {
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276 | 209cd7ab | Anthony PERARD | char token[XEN_BUFSIZE];
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277 | 209cd7ab | Anthony PERARD | snprintf(token, sizeof(token), "fe:%p", xendev); |
278 | 209cd7ab | Anthony PERARD | xs_unwatch(xenstore, xendev->fe, token); |
279 | 7267c094 | Anthony Liguori | g_free(xendev->fe); |
280 | 209cd7ab | Anthony PERARD | } |
281 | 209cd7ab | Anthony PERARD | |
282 | d5b93ddf | Anthony PERARD | if (xendev->evtchndev != XC_HANDLER_INITIAL_VALUE) {
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283 | 209cd7ab | Anthony PERARD | xc_evtchn_close(xendev->evtchndev); |
284 | 209cd7ab | Anthony PERARD | } |
285 | d5b93ddf | Anthony PERARD | if (xendev->gnttabdev != XC_HANDLER_INITIAL_VALUE) {
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286 | 209cd7ab | Anthony PERARD | xc_gnttab_close(xendev->gnttabdev); |
287 | 209cd7ab | Anthony PERARD | } |
288 | 209cd7ab | Anthony PERARD | |
289 | 209cd7ab | Anthony PERARD | QTAILQ_REMOVE(&xendevs, xendev, next); |
290 | 7267c094 | Anthony Liguori | g_free(xendev); |
291 | d94f9486 | aliguori | } |
292 | d94f9486 | aliguori | return NULL; |
293 | d94f9486 | aliguori | } |
294 | d94f9486 | aliguori | |
295 | d94f9486 | aliguori | /*
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296 | d94f9486 | aliguori | * Sync internal data structures on xenstore updates.
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297 | d94f9486 | aliguori | * Node specifies the changed field. node = NULL means
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298 | d94f9486 | aliguori | * update all fields (used for initialization).
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299 | d94f9486 | aliguori | */
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300 | d94f9486 | aliguori | static void xen_be_backend_changed(struct XenDevice *xendev, const char *node) |
301 | d94f9486 | aliguori | { |
302 | d94f9486 | aliguori | if (node == NULL || strcmp(node, "online") == 0) { |
303 | 209cd7ab | Anthony PERARD | if (xenstore_read_be_int(xendev, "online", &xendev->online) == -1) { |
304 | 209cd7ab | Anthony PERARD | xendev->online = 0;
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305 | 209cd7ab | Anthony PERARD | } |
306 | d94f9486 | aliguori | } |
307 | d94f9486 | aliguori | |
308 | d94f9486 | aliguori | if (node) {
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309 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 2, "backend update: %s\n", node); |
310 | 209cd7ab | Anthony PERARD | if (xendev->ops->backend_changed) {
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311 | 209cd7ab | Anthony PERARD | xendev->ops->backend_changed(xendev, node); |
312 | 209cd7ab | Anthony PERARD | } |
313 | d94f9486 | aliguori | } |
314 | d94f9486 | aliguori | } |
315 | d94f9486 | aliguori | |
316 | d94f9486 | aliguori | static void xen_be_frontend_changed(struct XenDevice *xendev, const char *node) |
317 | d94f9486 | aliguori | { |
318 | d94f9486 | aliguori | int fe_state;
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319 | d94f9486 | aliguori | |
320 | d94f9486 | aliguori | if (node == NULL || strcmp(node, "state") == 0) { |
321 | 209cd7ab | Anthony PERARD | if (xenstore_read_fe_int(xendev, "state", &fe_state) == -1) { |
322 | 209cd7ab | Anthony PERARD | fe_state = XenbusStateUnknown; |
323 | 209cd7ab | Anthony PERARD | } |
324 | 209cd7ab | Anthony PERARD | if (xendev->fe_state != fe_state) {
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325 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 1, "frontend state: %s -> %s\n", |
326 | 209cd7ab | Anthony PERARD | xenbus_strstate(xendev->fe_state), |
327 | 209cd7ab | Anthony PERARD | xenbus_strstate(fe_state)); |
328 | 209cd7ab | Anthony PERARD | } |
329 | 209cd7ab | Anthony PERARD | xendev->fe_state = fe_state; |
330 | d94f9486 | aliguori | } |
331 | d94f9486 | aliguori | if (node == NULL || strcmp(node, "protocol") == 0) { |
332 | 7267c094 | Anthony Liguori | g_free(xendev->protocol); |
333 | 209cd7ab | Anthony PERARD | xendev->protocol = xenstore_read_fe_str(xendev, "protocol");
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334 | 209cd7ab | Anthony PERARD | if (xendev->protocol) {
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335 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 1, "frontend protocol: %s\n", xendev->protocol); |
336 | 209cd7ab | Anthony PERARD | } |
337 | d94f9486 | aliguori | } |
338 | d94f9486 | aliguori | |
339 | d94f9486 | aliguori | if (node) {
|
340 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 2, "frontend update: %s\n", node); |
341 | 209cd7ab | Anthony PERARD | if (xendev->ops->frontend_changed) {
|
342 | 209cd7ab | Anthony PERARD | xendev->ops->frontend_changed(xendev, node); |
343 | 209cd7ab | Anthony PERARD | } |
344 | d94f9486 | aliguori | } |
345 | d94f9486 | aliguori | } |
346 | d94f9486 | aliguori | |
347 | d94f9486 | aliguori | /* ------------------------------------------------------------- */
|
348 | d94f9486 | aliguori | /* Check for possible state transitions and perform them. */
|
349 | d94f9486 | aliguori | |
350 | d94f9486 | aliguori | /*
|
351 | d94f9486 | aliguori | * Initial xendev setup. Read frontend path, register watch for it.
|
352 | d94f9486 | aliguori | * Should succeed once xend finished setting up the backend device.
|
353 | d94f9486 | aliguori | *
|
354 | d94f9486 | aliguori | * Also sets initial state (-> Initializing) when done. Which
|
355 | d94f9486 | aliguori | * only affects the xendev->be_state variable as xenbus should
|
356 | d94f9486 | aliguori | * already be put into that state by xend.
|
357 | d94f9486 | aliguori | */
|
358 | d94f9486 | aliguori | static int xen_be_try_setup(struct XenDevice *xendev) |
359 | d94f9486 | aliguori | { |
360 | d94f9486 | aliguori | char token[XEN_BUFSIZE];
|
361 | d94f9486 | aliguori | int be_state;
|
362 | d94f9486 | aliguori | |
363 | d94f9486 | aliguori | if (xenstore_read_be_int(xendev, "state", &be_state) == -1) { |
364 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 0, "reading backend state failed\n"); |
365 | 209cd7ab | Anthony PERARD | return -1; |
366 | d94f9486 | aliguori | } |
367 | d94f9486 | aliguori | |
368 | d94f9486 | aliguori | if (be_state != XenbusStateInitialising) {
|
369 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 0, "initial backend state is wrong (%s)\n", |
370 | 209cd7ab | Anthony PERARD | xenbus_strstate(be_state)); |
371 | 209cd7ab | Anthony PERARD | return -1; |
372 | d94f9486 | aliguori | } |
373 | d94f9486 | aliguori | |
374 | d94f9486 | aliguori | xendev->fe = xenstore_read_be_str(xendev, "frontend");
|
375 | d94f9486 | aliguori | if (xendev->fe == NULL) { |
376 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 0, "reading frontend path failed\n"); |
377 | 209cd7ab | Anthony PERARD | return -1; |
378 | d94f9486 | aliguori | } |
379 | d94f9486 | aliguori | |
380 | d94f9486 | aliguori | /* setup frontend watch */
|
381 | d94f9486 | aliguori | snprintf(token, sizeof(token), "fe:%p", xendev); |
382 | d94f9486 | aliguori | if (!xs_watch(xenstore, xendev->fe, token)) {
|
383 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 0, "watching frontend path (%s) failed\n", |
384 | 209cd7ab | Anthony PERARD | xendev->fe); |
385 | 209cd7ab | Anthony PERARD | return -1; |
386 | d94f9486 | aliguori | } |
387 | d94f9486 | aliguori | xen_be_set_state(xendev, XenbusStateInitialising); |
388 | d94f9486 | aliguori | |
389 | d94f9486 | aliguori | xen_be_backend_changed(xendev, NULL);
|
390 | d94f9486 | aliguori | xen_be_frontend_changed(xendev, NULL);
|
391 | d94f9486 | aliguori | return 0; |
392 | d94f9486 | aliguori | } |
393 | d94f9486 | aliguori | |
394 | d94f9486 | aliguori | /*
|
395 | d94f9486 | aliguori | * Try initialize xendev. Prepare everything the backend can do
|
396 | d94f9486 | aliguori | * without synchronizing with the frontend. Fakes hotplug-status. No
|
397 | d94f9486 | aliguori | * hotplug involved here because this is about userspace drivers, thus
|
398 | d94f9486 | aliguori | * there are kernel backend devices which could invoke hotplug.
|
399 | d94f9486 | aliguori | *
|
400 | d94f9486 | aliguori | * Goes to InitWait on success.
|
401 | d94f9486 | aliguori | */
|
402 | d94f9486 | aliguori | static int xen_be_try_init(struct XenDevice *xendev) |
403 | d94f9486 | aliguori | { |
404 | d94f9486 | aliguori | int rc = 0; |
405 | d94f9486 | aliguori | |
406 | d94f9486 | aliguori | if (!xendev->online) {
|
407 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 1, "not online\n"); |
408 | 209cd7ab | Anthony PERARD | return -1; |
409 | d94f9486 | aliguori | } |
410 | d94f9486 | aliguori | |
411 | 209cd7ab | Anthony PERARD | if (xendev->ops->init) {
|
412 | 209cd7ab | Anthony PERARD | rc = xendev->ops->init(xendev); |
413 | 209cd7ab | Anthony PERARD | } |
414 | d94f9486 | aliguori | if (rc != 0) { |
415 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 1, "init() failed\n"); |
416 | 209cd7ab | Anthony PERARD | return rc;
|
417 | d94f9486 | aliguori | } |
418 | d94f9486 | aliguori | |
419 | d94f9486 | aliguori | xenstore_write_be_str(xendev, "hotplug-status", "connected"); |
420 | d94f9486 | aliguori | xen_be_set_state(xendev, XenbusStateInitWait); |
421 | d94f9486 | aliguori | return 0; |
422 | d94f9486 | aliguori | } |
423 | d94f9486 | aliguori | |
424 | d94f9486 | aliguori | /*
|
425 | 384087b2 | John Haxby | * Try to initialise xendev. Depends on the frontend being ready
|
426 | d94f9486 | aliguori | * for it (shared ring and evtchn info in xenstore, state being
|
427 | d94f9486 | aliguori | * Initialised or Connected).
|
428 | d94f9486 | aliguori | *
|
429 | d94f9486 | aliguori | * Goes to Connected on success.
|
430 | d94f9486 | aliguori | */
|
431 | 384087b2 | John Haxby | static int xen_be_try_initialise(struct XenDevice *xendev) |
432 | d94f9486 | aliguori | { |
433 | d94f9486 | aliguori | int rc = 0; |
434 | d94f9486 | aliguori | |
435 | d94f9486 | aliguori | if (xendev->fe_state != XenbusStateInitialised &&
|
436 | 209cd7ab | Anthony PERARD | xendev->fe_state != XenbusStateConnected) { |
437 | 209cd7ab | Anthony PERARD | if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
|
438 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 2, "frontend not ready, ignoring\n"); |
439 | 209cd7ab | Anthony PERARD | } else {
|
440 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 2, "frontend not ready (yet)\n"); |
441 | 209cd7ab | Anthony PERARD | return -1; |
442 | 209cd7ab | Anthony PERARD | } |
443 | d94f9486 | aliguori | } |
444 | d94f9486 | aliguori | |
445 | 384087b2 | John Haxby | if (xendev->ops->initialise) {
|
446 | 384087b2 | John Haxby | rc = xendev->ops->initialise(xendev); |
447 | 209cd7ab | Anthony PERARD | } |
448 | d94f9486 | aliguori | if (rc != 0) { |
449 | 384087b2 | John Haxby | xen_be_printf(xendev, 0, "initialise() failed\n"); |
450 | 209cd7ab | Anthony PERARD | return rc;
|
451 | d94f9486 | aliguori | } |
452 | d94f9486 | aliguori | |
453 | d94f9486 | aliguori | xen_be_set_state(xendev, XenbusStateConnected); |
454 | d94f9486 | aliguori | return 0; |
455 | d94f9486 | aliguori | } |
456 | d94f9486 | aliguori | |
457 | d94f9486 | aliguori | /*
|
458 | 384087b2 | John Haxby | * Try to let xendev know that it is connected. Depends on the
|
459 | 384087b2 | John Haxby | * frontend being Connected. Note that this may be called more
|
460 | 384087b2 | John Haxby | * than once since the backend state is not modified.
|
461 | 384087b2 | John Haxby | */
|
462 | 384087b2 | John Haxby | static void xen_be_try_connected(struct XenDevice *xendev) |
463 | 384087b2 | John Haxby | { |
464 | 384087b2 | John Haxby | if (!xendev->ops->connected) {
|
465 | 384087b2 | John Haxby | return;
|
466 | 384087b2 | John Haxby | } |
467 | 384087b2 | John Haxby | |
468 | 384087b2 | John Haxby | if (xendev->fe_state != XenbusStateConnected) {
|
469 | 384087b2 | John Haxby | if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
|
470 | 384087b2 | John Haxby | xen_be_printf(xendev, 2, "frontend not ready, ignoring\n"); |
471 | 384087b2 | John Haxby | } else {
|
472 | 384087b2 | John Haxby | xen_be_printf(xendev, 2, "frontend not ready (yet)\n"); |
473 | 384087b2 | John Haxby | return;
|
474 | 384087b2 | John Haxby | } |
475 | 384087b2 | John Haxby | } |
476 | 384087b2 | John Haxby | |
477 | 384087b2 | John Haxby | xendev->ops->connected(xendev); |
478 | 384087b2 | John Haxby | } |
479 | 384087b2 | John Haxby | |
480 | 384087b2 | John Haxby | /*
|
481 | d94f9486 | aliguori | * Teardown connection.
|
482 | d94f9486 | aliguori | *
|
483 | d94f9486 | aliguori | * Goes to Closed when done.
|
484 | d94f9486 | aliguori | */
|
485 | d94f9486 | aliguori | static void xen_be_disconnect(struct XenDevice *xendev, enum xenbus_state state) |
486 | d94f9486 | aliguori | { |
487 | d94f9486 | aliguori | if (xendev->be_state != XenbusStateClosing &&
|
488 | d94f9486 | aliguori | xendev->be_state != XenbusStateClosed && |
489 | 209cd7ab | Anthony PERARD | xendev->ops->disconnect) { |
490 | 209cd7ab | Anthony PERARD | xendev->ops->disconnect(xendev); |
491 | 209cd7ab | Anthony PERARD | } |
492 | 209cd7ab | Anthony PERARD | if (xendev->be_state != state) {
|
493 | d94f9486 | aliguori | xen_be_set_state(xendev, state); |
494 | 209cd7ab | Anthony PERARD | } |
495 | d94f9486 | aliguori | } |
496 | d94f9486 | aliguori | |
497 | d94f9486 | aliguori | /*
|
498 | d94f9486 | aliguori | * Try to reset xendev, for reconnection by another frontend instance.
|
499 | d94f9486 | aliguori | */
|
500 | d94f9486 | aliguori | static int xen_be_try_reset(struct XenDevice *xendev) |
501 | d94f9486 | aliguori | { |
502 | 209cd7ab | Anthony PERARD | if (xendev->fe_state != XenbusStateInitialising) {
|
503 | d94f9486 | aliguori | return -1; |
504 | 209cd7ab | Anthony PERARD | } |
505 | d94f9486 | aliguori | |
506 | d94f9486 | aliguori | xen_be_printf(xendev, 1, "device reset (for re-connect)\n"); |
507 | d94f9486 | aliguori | xen_be_set_state(xendev, XenbusStateInitialising); |
508 | d94f9486 | aliguori | return 0; |
509 | d94f9486 | aliguori | } |
510 | d94f9486 | aliguori | |
511 | d94f9486 | aliguori | /*
|
512 | d94f9486 | aliguori | * state change dispatcher function
|
513 | d94f9486 | aliguori | */
|
514 | d94f9486 | aliguori | void xen_be_check_state(struct XenDevice *xendev) |
515 | d94f9486 | aliguori | { |
516 | d94f9486 | aliguori | int rc = 0; |
517 | d94f9486 | aliguori | |
518 | d94f9486 | aliguori | /* frontend may request shutdown from almost anywhere */
|
519 | d94f9486 | aliguori | if (xendev->fe_state == XenbusStateClosing ||
|
520 | 209cd7ab | Anthony PERARD | xendev->fe_state == XenbusStateClosed) { |
521 | 209cd7ab | Anthony PERARD | xen_be_disconnect(xendev, xendev->fe_state); |
522 | 209cd7ab | Anthony PERARD | return;
|
523 | d94f9486 | aliguori | } |
524 | d94f9486 | aliguori | |
525 | d94f9486 | aliguori | /* check for possible backend state transitions */
|
526 | d94f9486 | aliguori | for (;;) {
|
527 | 209cd7ab | Anthony PERARD | switch (xendev->be_state) {
|
528 | 209cd7ab | Anthony PERARD | case XenbusStateUnknown:
|
529 | 209cd7ab | Anthony PERARD | rc = xen_be_try_setup(xendev); |
530 | 209cd7ab | Anthony PERARD | break;
|
531 | 209cd7ab | Anthony PERARD | case XenbusStateInitialising:
|
532 | 209cd7ab | Anthony PERARD | rc = xen_be_try_init(xendev); |
533 | 209cd7ab | Anthony PERARD | break;
|
534 | 209cd7ab | Anthony PERARD | case XenbusStateInitWait:
|
535 | 384087b2 | John Haxby | rc = xen_be_try_initialise(xendev); |
536 | 384087b2 | John Haxby | break;
|
537 | 384087b2 | John Haxby | case XenbusStateConnected:
|
538 | 384087b2 | John Haxby | /* xendev->be_state doesn't change */
|
539 | 384087b2 | John Haxby | xen_be_try_connected(xendev); |
540 | 384087b2 | John Haxby | rc = -1;
|
541 | 209cd7ab | Anthony PERARD | break;
|
542 | d94f9486 | aliguori | case XenbusStateClosed:
|
543 | d94f9486 | aliguori | rc = xen_be_try_reset(xendev); |
544 | d94f9486 | aliguori | break;
|
545 | 209cd7ab | Anthony PERARD | default:
|
546 | 209cd7ab | Anthony PERARD | rc = -1;
|
547 | 209cd7ab | Anthony PERARD | } |
548 | 209cd7ab | Anthony PERARD | if (rc != 0) { |
549 | 209cd7ab | Anthony PERARD | break;
|
550 | 209cd7ab | Anthony PERARD | } |
551 | d94f9486 | aliguori | } |
552 | d94f9486 | aliguori | } |
553 | d94f9486 | aliguori | |
554 | d94f9486 | aliguori | /* ------------------------------------------------------------- */
|
555 | d94f9486 | aliguori | |
556 | d94f9486 | aliguori | static int xenstore_scan(const char *type, int dom, struct XenDevOps *ops) |
557 | d94f9486 | aliguori | { |
558 | d94f9486 | aliguori | struct XenDevice *xendev;
|
559 | d94f9486 | aliguori | char path[XEN_BUFSIZE], token[XEN_BUFSIZE];
|
560 | d94f9486 | aliguori | char **dev = NULL, *dom0; |
561 | d94f9486 | aliguori | unsigned int cdev, j; |
562 | d94f9486 | aliguori | |
563 | d94f9486 | aliguori | /* setup watch */
|
564 | d94f9486 | aliguori | dom0 = xs_get_domain_path(xenstore, 0);
|
565 | d94f9486 | aliguori | snprintf(token, sizeof(token), "be:%p:%d:%p", type, dom, ops); |
566 | d94f9486 | aliguori | snprintf(path, sizeof(path), "%s/backend/%s/%d", dom0, type, dom); |
567 | d94f9486 | aliguori | free(dom0); |
568 | d94f9486 | aliguori | if (!xs_watch(xenstore, path, token)) {
|
569 | 209cd7ab | Anthony PERARD | xen_be_printf(NULL, 0, "xen be: watching backend path (%s) failed\n", path); |
570 | 209cd7ab | Anthony PERARD | return -1; |
571 | d94f9486 | aliguori | } |
572 | d94f9486 | aliguori | |
573 | d94f9486 | aliguori | /* look for backends */
|
574 | d94f9486 | aliguori | dev = xs_directory(xenstore, 0, path, &cdev);
|
575 | 209cd7ab | Anthony PERARD | if (!dev) {
|
576 | 209cd7ab | Anthony PERARD | return 0; |
577 | 209cd7ab | Anthony PERARD | } |
578 | d94f9486 | aliguori | for (j = 0; j < cdev; j++) { |
579 | 209cd7ab | Anthony PERARD | xendev = xen_be_get_xendev(type, dom, atoi(dev[j]), ops); |
580 | 209cd7ab | Anthony PERARD | if (xendev == NULL) { |
581 | 209cd7ab | Anthony PERARD | continue;
|
582 | 209cd7ab | Anthony PERARD | } |
583 | 209cd7ab | Anthony PERARD | xen_be_check_state(xendev); |
584 | d94f9486 | aliguori | } |
585 | d94f9486 | aliguori | free(dev); |
586 | d94f9486 | aliguori | return 0; |
587 | d94f9486 | aliguori | } |
588 | d94f9486 | aliguori | |
589 | d94f9486 | aliguori | static void xenstore_update_be(char *watch, char *type, int dom, |
590 | 209cd7ab | Anthony PERARD | struct XenDevOps *ops)
|
591 | d94f9486 | aliguori | { |
592 | d94f9486 | aliguori | struct XenDevice *xendev;
|
593 | 77ba8fef | Stefano Stabellini | char path[XEN_BUFSIZE], *dom0, *bepath;
|
594 | d94f9486 | aliguori | unsigned int len, dev; |
595 | d94f9486 | aliguori | |
596 | d94f9486 | aliguori | dom0 = xs_get_domain_path(xenstore, 0);
|
597 | d94f9486 | aliguori | len = snprintf(path, sizeof(path), "%s/backend/%s/%d", dom0, type, dom); |
598 | d94f9486 | aliguori | free(dom0); |
599 | 209cd7ab | Anthony PERARD | if (strncmp(path, watch, len) != 0) { |
600 | 209cd7ab | Anthony PERARD | return;
|
601 | 209cd7ab | Anthony PERARD | } |
602 | d94f9486 | aliguori | if (sscanf(watch+len, "/%u/%255s", &dev, path) != 2) { |
603 | 209cd7ab | Anthony PERARD | strcpy(path, "");
|
604 | 209cd7ab | Anthony PERARD | if (sscanf(watch+len, "/%u", &dev) != 1) { |
605 | 209cd7ab | Anthony PERARD | dev = -1;
|
606 | 209cd7ab | Anthony PERARD | } |
607 | 209cd7ab | Anthony PERARD | } |
608 | 209cd7ab | Anthony PERARD | if (dev == -1) { |
609 | 209cd7ab | Anthony PERARD | return;
|
610 | d94f9486 | aliguori | } |
611 | d94f9486 | aliguori | |
612 | d94f9486 | aliguori | xendev = xen_be_get_xendev(type, dom, dev, ops); |
613 | d94f9486 | aliguori | if (xendev != NULL) { |
614 | 77ba8fef | Stefano Stabellini | bepath = xs_read(xenstore, 0, xendev->be, &len);
|
615 | 77ba8fef | Stefano Stabellini | if (bepath == NULL) { |
616 | 77ba8fef | Stefano Stabellini | xen_be_del_xendev(dom, dev); |
617 | 77ba8fef | Stefano Stabellini | } else {
|
618 | 77ba8fef | Stefano Stabellini | free(bepath); |
619 | 77ba8fef | Stefano Stabellini | xen_be_backend_changed(xendev, path); |
620 | 77ba8fef | Stefano Stabellini | xen_be_check_state(xendev); |
621 | 77ba8fef | Stefano Stabellini | } |
622 | d94f9486 | aliguori | } |
623 | d94f9486 | aliguori | } |
624 | d94f9486 | aliguori | |
625 | d94f9486 | aliguori | static void xenstore_update_fe(char *watch, struct XenDevice *xendev) |
626 | d94f9486 | aliguori | { |
627 | d94f9486 | aliguori | char *node;
|
628 | d94f9486 | aliguori | unsigned int len; |
629 | d94f9486 | aliguori | |
630 | d94f9486 | aliguori | len = strlen(xendev->fe); |
631 | 209cd7ab | Anthony PERARD | if (strncmp(xendev->fe, watch, len) != 0) { |
632 | 209cd7ab | Anthony PERARD | return;
|
633 | 209cd7ab | Anthony PERARD | } |
634 | 209cd7ab | Anthony PERARD | if (watch[len] != '/') { |
635 | 209cd7ab | Anthony PERARD | return;
|
636 | 209cd7ab | Anthony PERARD | } |
637 | d94f9486 | aliguori | node = watch + len + 1;
|
638 | d94f9486 | aliguori | |
639 | d94f9486 | aliguori | xen_be_frontend_changed(xendev, node); |
640 | d94f9486 | aliguori | xen_be_check_state(xendev); |
641 | d94f9486 | aliguori | } |
642 | d94f9486 | aliguori | |
643 | d94f9486 | aliguori | static void xenstore_update(void *unused) |
644 | d94f9486 | aliguori | { |
645 | d94f9486 | aliguori | char **vec = NULL; |
646 | d94f9486 | aliguori | intptr_t type, ops, ptr; |
647 | d94f9486 | aliguori | unsigned int dom, count; |
648 | d94f9486 | aliguori | |
649 | d94f9486 | aliguori | vec = xs_read_watch(xenstore, &count); |
650 | 209cd7ab | Anthony PERARD | if (vec == NULL) { |
651 | 209cd7ab | Anthony PERARD | goto cleanup;
|
652 | 209cd7ab | Anthony PERARD | } |
653 | d94f9486 | aliguori | |
654 | d94f9486 | aliguori | if (sscanf(vec[XS_WATCH_TOKEN], "be:%" PRIxPTR ":%d:%" PRIxPTR, |
655 | 209cd7ab | Anthony PERARD | &type, &dom, &ops) == 3) {
|
656 | 209cd7ab | Anthony PERARD | xenstore_update_be(vec[XS_WATCH_PATH], (void*)type, dom, (void*)ops); |
657 | 209cd7ab | Anthony PERARD | } |
658 | 209cd7ab | Anthony PERARD | if (sscanf(vec[XS_WATCH_TOKEN], "fe:%" PRIxPTR, &ptr) == 1) { |
659 | 209cd7ab | Anthony PERARD | xenstore_update_fe(vec[XS_WATCH_PATH], (void*)ptr);
|
660 | 209cd7ab | Anthony PERARD | } |
661 | d94f9486 | aliguori | |
662 | d94f9486 | aliguori | cleanup:
|
663 | 834fac78 | Jean-Christophe DUBOIS | free(vec); |
664 | d94f9486 | aliguori | } |
665 | d94f9486 | aliguori | |
666 | d94f9486 | aliguori | static void xen_be_evtchn_event(void *opaque) |
667 | d94f9486 | aliguori | { |
668 | d94f9486 | aliguori | struct XenDevice *xendev = opaque;
|
669 | d94f9486 | aliguori | evtchn_port_t port; |
670 | d94f9486 | aliguori | |
671 | d94f9486 | aliguori | port = xc_evtchn_pending(xendev->evtchndev); |
672 | d94f9486 | aliguori | if (port != xendev->local_port) {
|
673 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 0, "xc_evtchn_pending returned %d (expected %d)\n", |
674 | 209cd7ab | Anthony PERARD | port, xendev->local_port); |
675 | 209cd7ab | Anthony PERARD | return;
|
676 | d94f9486 | aliguori | } |
677 | d94f9486 | aliguori | xc_evtchn_unmask(xendev->evtchndev, port); |
678 | d94f9486 | aliguori | |
679 | 209cd7ab | Anthony PERARD | if (xendev->ops->event) {
|
680 | 209cd7ab | Anthony PERARD | xendev->ops->event(xendev); |
681 | 209cd7ab | Anthony PERARD | } |
682 | d94f9486 | aliguori | } |
683 | d94f9486 | aliguori | |
684 | d94f9486 | aliguori | /* -------------------------------------------------------------------- */
|
685 | d94f9486 | aliguori | |
686 | d94f9486 | aliguori | int xen_be_init(void) |
687 | d94f9486 | aliguori | { |
688 | d94f9486 | aliguori | xenstore = xs_daemon_open(); |
689 | d94f9486 | aliguori | if (!xenstore) {
|
690 | 209cd7ab | Anthony PERARD | xen_be_printf(NULL, 0, "can't connect to xenstored\n"); |
691 | 209cd7ab | Anthony PERARD | return -1; |
692 | d94f9486 | aliguori | } |
693 | d94f9486 | aliguori | |
694 | 209cd7ab | Anthony PERARD | if (qemu_set_fd_handler(xs_fileno(xenstore), xenstore_update, NULL, NULL) < 0) { |
695 | 209cd7ab | Anthony PERARD | goto err;
|
696 | 209cd7ab | Anthony PERARD | } |
697 | d94f9486 | aliguori | |
698 | d5b93ddf | Anthony PERARD | if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
|
699 | 3285cf4f | Anthony PERARD | /* Check if xen_init() have been called */
|
700 | 209cd7ab | Anthony PERARD | goto err;
|
701 | d94f9486 | aliguori | } |
702 | d94f9486 | aliguori | return 0; |
703 | d94f9486 | aliguori | |
704 | d94f9486 | aliguori | err:
|
705 | d94f9486 | aliguori | qemu_set_fd_handler(xs_fileno(xenstore), NULL, NULL, NULL); |
706 | d94f9486 | aliguori | xs_daemon_close(xenstore); |
707 | d94f9486 | aliguori | xenstore = NULL;
|
708 | d94f9486 | aliguori | |
709 | d94f9486 | aliguori | return -1; |
710 | d94f9486 | aliguori | } |
711 | d94f9486 | aliguori | |
712 | d94f9486 | aliguori | int xen_be_register(const char *type, struct XenDevOps *ops) |
713 | d94f9486 | aliguori | { |
714 | d94f9486 | aliguori | return xenstore_scan(type, xen_domid, ops);
|
715 | d94f9486 | aliguori | } |
716 | d94f9486 | aliguori | |
717 | d94f9486 | aliguori | int xen_be_bind_evtchn(struct XenDevice *xendev) |
718 | d94f9486 | aliguori | { |
719 | 209cd7ab | Anthony PERARD | if (xendev->local_port != -1) { |
720 | 209cd7ab | Anthony PERARD | return 0; |
721 | 209cd7ab | Anthony PERARD | } |
722 | d94f9486 | aliguori | xendev->local_port = xc_evtchn_bind_interdomain |
723 | 209cd7ab | Anthony PERARD | (xendev->evtchndev, xendev->dom, xendev->remote_port); |
724 | d94f9486 | aliguori | if (xendev->local_port == -1) { |
725 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 0, "xc_evtchn_bind_interdomain failed\n"); |
726 | 209cd7ab | Anthony PERARD | return -1; |
727 | d94f9486 | aliguori | } |
728 | d94f9486 | aliguori | xen_be_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port); |
729 | d94f9486 | aliguori | qemu_set_fd_handler(xc_evtchn_fd(xendev->evtchndev), |
730 | 209cd7ab | Anthony PERARD | xen_be_evtchn_event, NULL, xendev);
|
731 | d94f9486 | aliguori | return 0; |
732 | d94f9486 | aliguori | } |
733 | d94f9486 | aliguori | |
734 | d94f9486 | aliguori | void xen_be_unbind_evtchn(struct XenDevice *xendev) |
735 | d94f9486 | aliguori | { |
736 | 209cd7ab | Anthony PERARD | if (xendev->local_port == -1) { |
737 | 209cd7ab | Anthony PERARD | return;
|
738 | 209cd7ab | Anthony PERARD | } |
739 | d94f9486 | aliguori | qemu_set_fd_handler(xc_evtchn_fd(xendev->evtchndev), NULL, NULL, NULL); |
740 | d94f9486 | aliguori | xc_evtchn_unbind(xendev->evtchndev, xendev->local_port); |
741 | d94f9486 | aliguori | xen_be_printf(xendev, 2, "unbind evtchn port %d\n", xendev->local_port); |
742 | d94f9486 | aliguori | xendev->local_port = -1;
|
743 | d94f9486 | aliguori | } |
744 | d94f9486 | aliguori | |
745 | d94f9486 | aliguori | int xen_be_send_notify(struct XenDevice *xendev) |
746 | d94f9486 | aliguori | { |
747 | d94f9486 | aliguori | return xc_evtchn_notify(xendev->evtchndev, xendev->local_port);
|
748 | d94f9486 | aliguori | } |
749 | d94f9486 | aliguori | |
750 | d94f9486 | aliguori | /*
|
751 | d94f9486 | aliguori | * msg_level:
|
752 | d94f9486 | aliguori | * 0 == errors (stderr + logfile).
|
753 | d94f9486 | aliguori | * 1 == informative debug messages (logfile only).
|
754 | d94f9486 | aliguori | * 2 == noisy debug messages (logfile only).
|
755 | d94f9486 | aliguori | * 3 == will flood your log (logfile only).
|
756 | d94f9486 | aliguori | */
|
757 | d94f9486 | aliguori | void xen_be_printf(struct XenDevice *xendev, int msg_level, const char *fmt, ...) |
758 | d94f9486 | aliguori | { |
759 | d94f9486 | aliguori | va_list args; |
760 | d94f9486 | aliguori | |
761 | d94f9486 | aliguori | if (xendev) {
|
762 | 209cd7ab | Anthony PERARD | if (msg_level > xendev->debug) {
|
763 | d94f9486 | aliguori | return;
|
764 | 209cd7ab | Anthony PERARD | } |
765 | d94f9486 | aliguori | qemu_log("xen be: %s: ", xendev->name);
|
766 | 209cd7ab | Anthony PERARD | if (msg_level == 0) { |
767 | d94f9486 | aliguori | fprintf(stderr, "xen be: %s: ", xendev->name);
|
768 | 209cd7ab | Anthony PERARD | } |
769 | d94f9486 | aliguori | } else {
|
770 | 209cd7ab | Anthony PERARD | if (msg_level > debug) {
|
771 | d94f9486 | aliguori | return;
|
772 | 209cd7ab | Anthony PERARD | } |
773 | d94f9486 | aliguori | qemu_log("xen be core: ");
|
774 | 209cd7ab | Anthony PERARD | if (msg_level == 0) { |
775 | d94f9486 | aliguori | fprintf(stderr, "xen be core: ");
|
776 | 209cd7ab | Anthony PERARD | } |
777 | d94f9486 | aliguori | } |
778 | d94f9486 | aliguori | va_start(args, fmt); |
779 | d94f9486 | aliguori | qemu_log_vprintf(fmt, args); |
780 | d94f9486 | aliguori | va_end(args); |
781 | d94f9486 | aliguori | if (msg_level == 0) { |
782 | d94f9486 | aliguori | va_start(args, fmt); |
783 | d94f9486 | aliguori | vfprintf(stderr, fmt, args); |
784 | d94f9486 | aliguori | va_end(args); |
785 | d94f9486 | aliguori | } |
786 | d94f9486 | aliguori | qemu_log_flush(); |
787 | d94f9486 | aliguori | } |