root / hw / xen_backend.c @ e13e973e
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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 | d94f9486 | aliguori | */
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17 | d94f9486 | aliguori | |
18 | d94f9486 | aliguori | /*
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19 | d94f9486 | aliguori | * TODO: add some xenbus / xenstore concepts overview here.
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20 | d94f9486 | aliguori | */
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21 | d94f9486 | aliguori | |
22 | d94f9486 | aliguori | #include <stdio.h> |
23 | d94f9486 | aliguori | #include <stdlib.h> |
24 | d94f9486 | aliguori | #include <stdarg.h> |
25 | d94f9486 | aliguori | #include <string.h> |
26 | d94f9486 | aliguori | #include <unistd.h> |
27 | d94f9486 | aliguori | #include <fcntl.h> |
28 | d94f9486 | aliguori | #include <inttypes.h> |
29 | d94f9486 | aliguori | #include <sys/types.h> |
30 | d94f9486 | aliguori | #include <sys/stat.h> |
31 | d94f9486 | aliguori | #include <sys/mman.h> |
32 | d94f9486 | aliguori | #include <sys/signal.h> |
33 | d94f9486 | aliguori | |
34 | d94f9486 | aliguori | #include <xs.h> |
35 | d94f9486 | aliguori | #include <xenctrl.h> |
36 | d94f9486 | aliguori | #include <xen/grant_table.h> |
37 | d94f9486 | aliguori | |
38 | d94f9486 | aliguori | #include "hw.h" |
39 | d94f9486 | aliguori | #include "qemu-char.h" |
40 | 2567f579 | Blue Swirl | #include "qemu-log.h" |
41 | d94f9486 | aliguori | #include "xen_backend.h" |
42 | d94f9486 | aliguori | |
43 | d94f9486 | aliguori | /* ------------------------------------------------------------- */
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44 | d94f9486 | aliguori | |
45 | d94f9486 | aliguori | /* public */
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46 | d5b93ddf | Anthony PERARD | XenXC xen_xc = XC_HANDLER_INITIAL_VALUE; |
47 | d5b93ddf | Anthony PERARD | XenGnttab xen_xcg = XC_HANDLER_INITIAL_VALUE; |
48 | d94f9486 | aliguori | struct xs_handle *xenstore = NULL; |
49 | 2c8b24a3 | aliguori | const char *xen_protocol; |
50 | d94f9486 | aliguori | |
51 | d94f9486 | aliguori | /* private */
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52 | 72cf2d4f | Blue Swirl | static QTAILQ_HEAD(XenDeviceHead, XenDevice) xendevs = QTAILQ_HEAD_INITIALIZER(xendevs);
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53 | d94f9486 | aliguori | static int debug = 0; |
54 | d94f9486 | aliguori | |
55 | d94f9486 | aliguori | /* ------------------------------------------------------------- */
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56 | d94f9486 | aliguori | |
57 | d94f9486 | aliguori | int xenstore_write_str(const char *base, const char *node, const char *val) |
58 | d94f9486 | aliguori | { |
59 | d94f9486 | aliguori | char abspath[XEN_BUFSIZE];
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60 | d94f9486 | aliguori | |
61 | d94f9486 | aliguori | snprintf(abspath, sizeof(abspath), "%s/%s", base, node); |
62 | 209cd7ab | Anthony PERARD | if (!xs_write(xenstore, 0, abspath, val, strlen(val))) { |
63 | 209cd7ab | Anthony PERARD | return -1; |
64 | 209cd7ab | Anthony PERARD | } |
65 | d94f9486 | aliguori | return 0; |
66 | d94f9486 | aliguori | } |
67 | d94f9486 | aliguori | |
68 | d94f9486 | aliguori | char *xenstore_read_str(const char *base, const char *node) |
69 | d94f9486 | aliguori | { |
70 | d94f9486 | aliguori | char abspath[XEN_BUFSIZE];
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71 | d94f9486 | aliguori | unsigned int len; |
72 | d94f9486 | aliguori | char *str, *ret = NULL; |
73 | d94f9486 | aliguori | |
74 | d94f9486 | aliguori | snprintf(abspath, sizeof(abspath), "%s/%s", base, node); |
75 | d94f9486 | aliguori | str = xs_read(xenstore, 0, abspath, &len);
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76 | d94f9486 | aliguori | if (str != NULL) { |
77 | d94f9486 | aliguori | /* move to qemu-allocated memory to make sure
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78 | d94f9486 | aliguori | * callers can savely qemu_free() stuff. */
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79 | d94f9486 | aliguori | ret = qemu_strdup(str); |
80 | d94f9486 | aliguori | free(str); |
81 | d94f9486 | aliguori | } |
82 | d94f9486 | aliguori | return ret;
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83 | d94f9486 | aliguori | } |
84 | d94f9486 | aliguori | |
85 | d94f9486 | aliguori | int xenstore_write_int(const char *base, const char *node, int ival) |
86 | d94f9486 | aliguori | { |
87 | d94f9486 | aliguori | char val[32]; |
88 | d94f9486 | aliguori | |
89 | d94f9486 | aliguori | snprintf(val, sizeof(val), "%d", ival); |
90 | d94f9486 | aliguori | return xenstore_write_str(base, node, val);
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91 | d94f9486 | aliguori | } |
92 | d94f9486 | aliguori | |
93 | d94f9486 | aliguori | int xenstore_read_int(const char *base, const char *node, int *ival) |
94 | d94f9486 | aliguori | { |
95 | d94f9486 | aliguori | char *val;
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96 | d94f9486 | aliguori | int rc = -1; |
97 | d94f9486 | aliguori | |
98 | d94f9486 | aliguori | val = xenstore_read_str(base, node); |
99 | 209cd7ab | Anthony PERARD | if (val && 1 == sscanf(val, "%d", ival)) { |
100 | 209cd7ab | Anthony PERARD | rc = 0;
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101 | 209cd7ab | Anthony PERARD | } |
102 | d94f9486 | aliguori | qemu_free(val); |
103 | d94f9486 | aliguori | return rc;
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104 | d94f9486 | aliguori | } |
105 | d94f9486 | aliguori | |
106 | d94f9486 | aliguori | int xenstore_write_be_str(struct XenDevice *xendev, const char *node, const char *val) |
107 | d94f9486 | aliguori | { |
108 | d94f9486 | aliguori | return xenstore_write_str(xendev->be, node, val);
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109 | d94f9486 | aliguori | } |
110 | d94f9486 | aliguori | |
111 | d94f9486 | aliguori | int xenstore_write_be_int(struct XenDevice *xendev, const char *node, int ival) |
112 | d94f9486 | aliguori | { |
113 | d94f9486 | aliguori | return xenstore_write_int(xendev->be, node, ival);
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114 | d94f9486 | aliguori | } |
115 | d94f9486 | aliguori | |
116 | d94f9486 | aliguori | char *xenstore_read_be_str(struct XenDevice *xendev, const char *node) |
117 | d94f9486 | aliguori | { |
118 | d94f9486 | aliguori | return xenstore_read_str(xendev->be, node);
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119 | d94f9486 | aliguori | } |
120 | d94f9486 | aliguori | |
121 | d94f9486 | aliguori | int xenstore_read_be_int(struct XenDevice *xendev, const char *node, int *ival) |
122 | d94f9486 | aliguori | { |
123 | d94f9486 | aliguori | return xenstore_read_int(xendev->be, node, ival);
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124 | d94f9486 | aliguori | } |
125 | d94f9486 | aliguori | |
126 | d94f9486 | aliguori | char *xenstore_read_fe_str(struct XenDevice *xendev, const char *node) |
127 | d94f9486 | aliguori | { |
128 | d94f9486 | aliguori | return xenstore_read_str(xendev->fe, node);
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129 | d94f9486 | aliguori | } |
130 | d94f9486 | aliguori | |
131 | d94f9486 | aliguori | int xenstore_read_fe_int(struct XenDevice *xendev, const char *node, int *ival) |
132 | d94f9486 | aliguori | { |
133 | d94f9486 | aliguori | return xenstore_read_int(xendev->fe, node, ival);
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134 | d94f9486 | aliguori | } |
135 | d94f9486 | aliguori | |
136 | d94f9486 | aliguori | /* ------------------------------------------------------------- */
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137 | d94f9486 | aliguori | |
138 | d94f9486 | aliguori | const char *xenbus_strstate(enum xenbus_state state) |
139 | d94f9486 | aliguori | { |
140 | 209cd7ab | Anthony PERARD | static const char *const name[] = { |
141 | 209cd7ab | Anthony PERARD | [ XenbusStateUnknown ] = "Unknown",
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142 | 209cd7ab | Anthony PERARD | [ XenbusStateInitialising ] = "Initialising",
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143 | 209cd7ab | Anthony PERARD | [ XenbusStateInitWait ] = "InitWait",
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144 | 209cd7ab | Anthony PERARD | [ XenbusStateInitialised ] = "Initialised",
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145 | 209cd7ab | Anthony PERARD | [ XenbusStateConnected ] = "Connected",
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146 | 209cd7ab | Anthony PERARD | [ XenbusStateClosing ] = "Closing",
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147 | 209cd7ab | Anthony PERARD | [ XenbusStateClosed ] = "Closed",
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148 | 209cd7ab | Anthony PERARD | }; |
149 | 209cd7ab | Anthony PERARD | return (state < ARRAY_SIZE(name)) ? name[state] : "INVALID"; |
150 | d94f9486 | aliguori | } |
151 | d94f9486 | aliguori | |
152 | d94f9486 | aliguori | int xen_be_set_state(struct XenDevice *xendev, enum xenbus_state state) |
153 | d94f9486 | aliguori | { |
154 | d94f9486 | aliguori | int rc;
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155 | d94f9486 | aliguori | |
156 | d94f9486 | aliguori | rc = xenstore_write_be_int(xendev, "state", state);
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157 | 209cd7ab | Anthony PERARD | if (rc < 0) { |
158 | 209cd7ab | Anthony PERARD | return rc;
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159 | 209cd7ab | Anthony PERARD | } |
160 | d94f9486 | aliguori | xen_be_printf(xendev, 1, "backend state: %s -> %s\n", |
161 | 209cd7ab | Anthony PERARD | xenbus_strstate(xendev->be_state), xenbus_strstate(state)); |
162 | d94f9486 | aliguori | xendev->be_state = state; |
163 | d94f9486 | aliguori | return 0; |
164 | d94f9486 | aliguori | } |
165 | d94f9486 | aliguori | |
166 | d94f9486 | aliguori | /* ------------------------------------------------------------- */
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167 | d94f9486 | aliguori | |
168 | d94f9486 | aliguori | struct XenDevice *xen_be_find_xendev(const char *type, int dom, int dev) |
169 | d94f9486 | aliguori | { |
170 | d94f9486 | aliguori | struct XenDevice *xendev;
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171 | d94f9486 | aliguori | |
172 | 72cf2d4f | Blue Swirl | QTAILQ_FOREACH(xendev, &xendevs, next) { |
173 | 209cd7ab | Anthony PERARD | if (xendev->dom != dom) {
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174 | 209cd7ab | Anthony PERARD | continue;
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175 | 209cd7ab | Anthony PERARD | } |
176 | 209cd7ab | Anthony PERARD | if (xendev->dev != dev) {
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177 | 209cd7ab | Anthony PERARD | continue;
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178 | 209cd7ab | Anthony PERARD | } |
179 | 209cd7ab | Anthony PERARD | if (strcmp(xendev->type, type) != 0) { |
180 | 209cd7ab | Anthony PERARD | continue;
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181 | 209cd7ab | Anthony PERARD | } |
182 | 209cd7ab | Anthony PERARD | return xendev;
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183 | d94f9486 | aliguori | } |
184 | d94f9486 | aliguori | return NULL; |
185 | d94f9486 | aliguori | } |
186 | d94f9486 | aliguori | |
187 | d94f9486 | aliguori | /*
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188 | d94f9486 | aliguori | * get xen backend device, allocate a new one if it doesn't exist.
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189 | d94f9486 | aliguori | */
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190 | d94f9486 | aliguori | static struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev, |
191 | d94f9486 | aliguori | struct XenDevOps *ops)
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192 | d94f9486 | aliguori | { |
193 | d94f9486 | aliguori | struct XenDevice *xendev;
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194 | d94f9486 | aliguori | char *dom0;
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195 | d94f9486 | aliguori | |
196 | d94f9486 | aliguori | xendev = xen_be_find_xendev(type, dom, dev); |
197 | 209cd7ab | Anthony PERARD | if (xendev) {
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198 | 209cd7ab | Anthony PERARD | return xendev;
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199 | 209cd7ab | Anthony PERARD | } |
200 | d94f9486 | aliguori | |
201 | d94f9486 | aliguori | /* init new xendev */
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202 | d94f9486 | aliguori | xendev = qemu_mallocz(ops->size); |
203 | d94f9486 | aliguori | xendev->type = type; |
204 | d94f9486 | aliguori | xendev->dom = dom; |
205 | d94f9486 | aliguori | xendev->dev = dev; |
206 | d94f9486 | aliguori | xendev->ops = ops; |
207 | d94f9486 | aliguori | |
208 | d94f9486 | aliguori | dom0 = xs_get_domain_path(xenstore, 0);
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209 | d94f9486 | aliguori | snprintf(xendev->be, sizeof(xendev->be), "%s/backend/%s/%d/%d", |
210 | 209cd7ab | Anthony PERARD | dom0, xendev->type, xendev->dom, xendev->dev); |
211 | d94f9486 | aliguori | snprintf(xendev->name, sizeof(xendev->name), "%s-%d", |
212 | 209cd7ab | Anthony PERARD | xendev->type, xendev->dev); |
213 | d94f9486 | aliguori | free(dom0); |
214 | d94f9486 | aliguori | |
215 | d94f9486 | aliguori | xendev->debug = debug; |
216 | d94f9486 | aliguori | xendev->local_port = -1;
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217 | d94f9486 | aliguori | |
218 | d5b93ddf | Anthony PERARD | xendev->evtchndev = xen_xc_evtchn_open(NULL, 0); |
219 | d5b93ddf | Anthony PERARD | if (xendev->evtchndev == XC_HANDLER_INITIAL_VALUE) {
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220 | 209cd7ab | Anthony PERARD | xen_be_printf(NULL, 0, "can't open evtchn device\n"); |
221 | 209cd7ab | Anthony PERARD | qemu_free(xendev); |
222 | 209cd7ab | Anthony PERARD | return NULL; |
223 | d94f9486 | aliguori | } |
224 | d94f9486 | aliguori | fcntl(xc_evtchn_fd(xendev->evtchndev), F_SETFD, FD_CLOEXEC); |
225 | d94f9486 | aliguori | |
226 | d94f9486 | aliguori | if (ops->flags & DEVOPS_FLAG_NEED_GNTDEV) {
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227 | d5b93ddf | Anthony PERARD | xendev->gnttabdev = xen_xc_gnttab_open(NULL, 0); |
228 | d5b93ddf | Anthony PERARD | if (xendev->gnttabdev == XC_HANDLER_INITIAL_VALUE) {
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229 | 209cd7ab | Anthony PERARD | xen_be_printf(NULL, 0, "can't open gnttab device\n"); |
230 | 209cd7ab | Anthony PERARD | xc_evtchn_close(xendev->evtchndev); |
231 | 209cd7ab | Anthony PERARD | qemu_free(xendev); |
232 | 209cd7ab | Anthony PERARD | return NULL; |
233 | 209cd7ab | Anthony PERARD | } |
234 | d94f9486 | aliguori | } else {
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235 | d5b93ddf | Anthony PERARD | xendev->gnttabdev = XC_HANDLER_INITIAL_VALUE; |
236 | d94f9486 | aliguori | } |
237 | d94f9486 | aliguori | |
238 | 72cf2d4f | Blue Swirl | QTAILQ_INSERT_TAIL(&xendevs, xendev, next); |
239 | d94f9486 | aliguori | |
240 | 209cd7ab | Anthony PERARD | if (xendev->ops->alloc) {
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241 | 209cd7ab | Anthony PERARD | xendev->ops->alloc(xendev); |
242 | 209cd7ab | Anthony PERARD | } |
243 | d94f9486 | aliguori | |
244 | d94f9486 | aliguori | return xendev;
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245 | d94f9486 | aliguori | } |
246 | d94f9486 | aliguori | |
247 | d94f9486 | aliguori | /*
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248 | d94f9486 | aliguori | * release xen backend device.
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249 | d94f9486 | aliguori | */
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250 | d94f9486 | aliguori | static struct XenDevice *xen_be_del_xendev(int dom, int dev) |
251 | d94f9486 | aliguori | { |
252 | d94f9486 | aliguori | struct XenDevice *xendev, *xnext;
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253 | d94f9486 | aliguori | |
254 | d94f9486 | aliguori | /*
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255 | 72cf2d4f | Blue Swirl | * This is pretty much like QTAILQ_FOREACH(xendev, &xendevs, next) but
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256 | d94f9486 | aliguori | * we save the next pointer in xnext because we might free xendev.
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257 | d94f9486 | aliguori | */
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258 | d94f9486 | aliguori | xnext = xendevs.tqh_first; |
259 | d94f9486 | aliguori | while (xnext) {
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260 | d94f9486 | aliguori | xendev = xnext; |
261 | d94f9486 | aliguori | xnext = xendev->next.tqe_next; |
262 | d94f9486 | aliguori | |
263 | 209cd7ab | Anthony PERARD | if (xendev->dom != dom) {
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264 | 209cd7ab | Anthony PERARD | continue;
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265 | 209cd7ab | Anthony PERARD | } |
266 | 209cd7ab | Anthony PERARD | if (xendev->dev != dev && dev != -1) { |
267 | 209cd7ab | Anthony PERARD | continue;
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268 | 209cd7ab | Anthony PERARD | } |
269 | 209cd7ab | Anthony PERARD | |
270 | 209cd7ab | Anthony PERARD | if (xendev->ops->free) {
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271 | 209cd7ab | Anthony PERARD | xendev->ops->free(xendev); |
272 | 209cd7ab | Anthony PERARD | } |
273 | 209cd7ab | Anthony PERARD | |
274 | 209cd7ab | Anthony PERARD | if (xendev->fe) {
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275 | 209cd7ab | Anthony PERARD | char token[XEN_BUFSIZE];
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276 | 209cd7ab | Anthony PERARD | snprintf(token, sizeof(token), "fe:%p", xendev); |
277 | 209cd7ab | Anthony PERARD | xs_unwatch(xenstore, xendev->fe, token); |
278 | 209cd7ab | Anthony PERARD | qemu_free(xendev->fe); |
279 | 209cd7ab | Anthony PERARD | } |
280 | 209cd7ab | Anthony PERARD | |
281 | d5b93ddf | Anthony PERARD | if (xendev->evtchndev != XC_HANDLER_INITIAL_VALUE) {
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282 | 209cd7ab | Anthony PERARD | xc_evtchn_close(xendev->evtchndev); |
283 | 209cd7ab | Anthony PERARD | } |
284 | d5b93ddf | Anthony PERARD | if (xendev->gnttabdev != XC_HANDLER_INITIAL_VALUE) {
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285 | 209cd7ab | Anthony PERARD | xc_gnttab_close(xendev->gnttabdev); |
286 | 209cd7ab | Anthony PERARD | } |
287 | 209cd7ab | Anthony PERARD | |
288 | 209cd7ab | Anthony PERARD | QTAILQ_REMOVE(&xendevs, xendev, next); |
289 | 209cd7ab | Anthony PERARD | qemu_free(xendev); |
290 | d94f9486 | aliguori | } |
291 | d94f9486 | aliguori | return NULL; |
292 | d94f9486 | aliguori | } |
293 | d94f9486 | aliguori | |
294 | d94f9486 | aliguori | /*
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295 | d94f9486 | aliguori | * Sync internal data structures on xenstore updates.
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296 | d94f9486 | aliguori | * Node specifies the changed field. node = NULL means
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297 | d94f9486 | aliguori | * update all fields (used for initialization).
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298 | d94f9486 | aliguori | */
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299 | d94f9486 | aliguori | static void xen_be_backend_changed(struct XenDevice *xendev, const char *node) |
300 | d94f9486 | aliguori | { |
301 | d94f9486 | aliguori | if (node == NULL || strcmp(node, "online") == 0) { |
302 | 209cd7ab | Anthony PERARD | if (xenstore_read_be_int(xendev, "online", &xendev->online) == -1) { |
303 | 209cd7ab | Anthony PERARD | xendev->online = 0;
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304 | 209cd7ab | Anthony PERARD | } |
305 | d94f9486 | aliguori | } |
306 | d94f9486 | aliguori | |
307 | d94f9486 | aliguori | if (node) {
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308 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 2, "backend update: %s\n", node); |
309 | 209cd7ab | Anthony PERARD | if (xendev->ops->backend_changed) {
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310 | 209cd7ab | Anthony PERARD | xendev->ops->backend_changed(xendev, node); |
311 | 209cd7ab | Anthony PERARD | } |
312 | d94f9486 | aliguori | } |
313 | d94f9486 | aliguori | } |
314 | d94f9486 | aliguori | |
315 | d94f9486 | aliguori | static void xen_be_frontend_changed(struct XenDevice *xendev, const char *node) |
316 | d94f9486 | aliguori | { |
317 | d94f9486 | aliguori | int fe_state;
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318 | d94f9486 | aliguori | |
319 | d94f9486 | aliguori | if (node == NULL || strcmp(node, "state") == 0) { |
320 | 209cd7ab | Anthony PERARD | if (xenstore_read_fe_int(xendev, "state", &fe_state) == -1) { |
321 | 209cd7ab | Anthony PERARD | fe_state = XenbusStateUnknown; |
322 | 209cd7ab | Anthony PERARD | } |
323 | 209cd7ab | Anthony PERARD | if (xendev->fe_state != fe_state) {
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324 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 1, "frontend state: %s -> %s\n", |
325 | 209cd7ab | Anthony PERARD | xenbus_strstate(xendev->fe_state), |
326 | 209cd7ab | Anthony PERARD | xenbus_strstate(fe_state)); |
327 | 209cd7ab | Anthony PERARD | } |
328 | 209cd7ab | Anthony PERARD | xendev->fe_state = fe_state; |
329 | d94f9486 | aliguori | } |
330 | d94f9486 | aliguori | if (node == NULL || strcmp(node, "protocol") == 0) { |
331 | 209cd7ab | Anthony PERARD | qemu_free(xendev->protocol); |
332 | 209cd7ab | Anthony PERARD | xendev->protocol = xenstore_read_fe_str(xendev, "protocol");
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333 | 209cd7ab | Anthony PERARD | if (xendev->protocol) {
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334 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 1, "frontend protocol: %s\n", xendev->protocol); |
335 | 209cd7ab | Anthony PERARD | } |
336 | d94f9486 | aliguori | } |
337 | d94f9486 | aliguori | |
338 | d94f9486 | aliguori | if (node) {
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339 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 2, "frontend update: %s\n", node); |
340 | 209cd7ab | Anthony PERARD | if (xendev->ops->frontend_changed) {
|
341 | 209cd7ab | Anthony PERARD | xendev->ops->frontend_changed(xendev, node); |
342 | 209cd7ab | Anthony PERARD | } |
343 | d94f9486 | aliguori | } |
344 | d94f9486 | aliguori | } |
345 | d94f9486 | aliguori | |
346 | d94f9486 | aliguori | /* ------------------------------------------------------------- */
|
347 | d94f9486 | aliguori | /* Check for possible state transitions and perform them. */
|
348 | d94f9486 | aliguori | |
349 | d94f9486 | aliguori | /*
|
350 | d94f9486 | aliguori | * Initial xendev setup. Read frontend path, register watch for it.
|
351 | d94f9486 | aliguori | * Should succeed once xend finished setting up the backend device.
|
352 | d94f9486 | aliguori | *
|
353 | d94f9486 | aliguori | * Also sets initial state (-> Initializing) when done. Which
|
354 | d94f9486 | aliguori | * only affects the xendev->be_state variable as xenbus should
|
355 | d94f9486 | aliguori | * already be put into that state by xend.
|
356 | d94f9486 | aliguori | */
|
357 | d94f9486 | aliguori | static int xen_be_try_setup(struct XenDevice *xendev) |
358 | d94f9486 | aliguori | { |
359 | d94f9486 | aliguori | char token[XEN_BUFSIZE];
|
360 | d94f9486 | aliguori | int be_state;
|
361 | d94f9486 | aliguori | |
362 | d94f9486 | aliguori | if (xenstore_read_be_int(xendev, "state", &be_state) == -1) { |
363 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 0, "reading backend state failed\n"); |
364 | 209cd7ab | Anthony PERARD | return -1; |
365 | d94f9486 | aliguori | } |
366 | d94f9486 | aliguori | |
367 | d94f9486 | aliguori | if (be_state != XenbusStateInitialising) {
|
368 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 0, "initial backend state is wrong (%s)\n", |
369 | 209cd7ab | Anthony PERARD | xenbus_strstate(be_state)); |
370 | 209cd7ab | Anthony PERARD | return -1; |
371 | d94f9486 | aliguori | } |
372 | d94f9486 | aliguori | |
373 | d94f9486 | aliguori | xendev->fe = xenstore_read_be_str(xendev, "frontend");
|
374 | d94f9486 | aliguori | if (xendev->fe == NULL) { |
375 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 0, "reading frontend path failed\n"); |
376 | 209cd7ab | Anthony PERARD | return -1; |
377 | d94f9486 | aliguori | } |
378 | d94f9486 | aliguori | |
379 | d94f9486 | aliguori | /* setup frontend watch */
|
380 | d94f9486 | aliguori | snprintf(token, sizeof(token), "fe:%p", xendev); |
381 | d94f9486 | aliguori | if (!xs_watch(xenstore, xendev->fe, token)) {
|
382 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 0, "watching frontend path (%s) failed\n", |
383 | 209cd7ab | Anthony PERARD | xendev->fe); |
384 | 209cd7ab | Anthony PERARD | return -1; |
385 | d94f9486 | aliguori | } |
386 | d94f9486 | aliguori | xen_be_set_state(xendev, XenbusStateInitialising); |
387 | d94f9486 | aliguori | |
388 | d94f9486 | aliguori | xen_be_backend_changed(xendev, NULL);
|
389 | d94f9486 | aliguori | xen_be_frontend_changed(xendev, NULL);
|
390 | d94f9486 | aliguori | return 0; |
391 | d94f9486 | aliguori | } |
392 | d94f9486 | aliguori | |
393 | d94f9486 | aliguori | /*
|
394 | d94f9486 | aliguori | * Try initialize xendev. Prepare everything the backend can do
|
395 | d94f9486 | aliguori | * without synchronizing with the frontend. Fakes hotplug-status. No
|
396 | d94f9486 | aliguori | * hotplug involved here because this is about userspace drivers, thus
|
397 | d94f9486 | aliguori | * there are kernel backend devices which could invoke hotplug.
|
398 | d94f9486 | aliguori | *
|
399 | d94f9486 | aliguori | * Goes to InitWait on success.
|
400 | d94f9486 | aliguori | */
|
401 | d94f9486 | aliguori | static int xen_be_try_init(struct XenDevice *xendev) |
402 | d94f9486 | aliguori | { |
403 | d94f9486 | aliguori | int rc = 0; |
404 | d94f9486 | aliguori | |
405 | d94f9486 | aliguori | if (!xendev->online) {
|
406 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 1, "not online\n"); |
407 | 209cd7ab | Anthony PERARD | return -1; |
408 | d94f9486 | aliguori | } |
409 | d94f9486 | aliguori | |
410 | 209cd7ab | Anthony PERARD | if (xendev->ops->init) {
|
411 | 209cd7ab | Anthony PERARD | rc = xendev->ops->init(xendev); |
412 | 209cd7ab | Anthony PERARD | } |
413 | d94f9486 | aliguori | if (rc != 0) { |
414 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 1, "init() failed\n"); |
415 | 209cd7ab | Anthony PERARD | return rc;
|
416 | d94f9486 | aliguori | } |
417 | d94f9486 | aliguori | |
418 | d94f9486 | aliguori | xenstore_write_be_str(xendev, "hotplug-status", "connected"); |
419 | d94f9486 | aliguori | xen_be_set_state(xendev, XenbusStateInitWait); |
420 | d94f9486 | aliguori | return 0; |
421 | d94f9486 | aliguori | } |
422 | d94f9486 | aliguori | |
423 | d94f9486 | aliguori | /*
|
424 | d94f9486 | aliguori | * Try to connect xendev. Depends on the frontend being ready
|
425 | d94f9486 | aliguori | * for it (shared ring and evtchn info in xenstore, state being
|
426 | d94f9486 | aliguori | * Initialised or Connected).
|
427 | d94f9486 | aliguori | *
|
428 | d94f9486 | aliguori | * Goes to Connected on success.
|
429 | d94f9486 | aliguori | */
|
430 | d94f9486 | aliguori | static int xen_be_try_connect(struct XenDevice *xendev) |
431 | d94f9486 | aliguori | { |
432 | d94f9486 | aliguori | int rc = 0; |
433 | d94f9486 | aliguori | |
434 | d94f9486 | aliguori | if (xendev->fe_state != XenbusStateInitialised &&
|
435 | 209cd7ab | Anthony PERARD | xendev->fe_state != XenbusStateConnected) { |
436 | 209cd7ab | Anthony PERARD | if (xendev->ops->flags & DEVOPS_FLAG_IGNORE_STATE) {
|
437 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 2, "frontend not ready, ignoring\n"); |
438 | 209cd7ab | Anthony PERARD | } else {
|
439 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 2, "frontend not ready (yet)\n"); |
440 | 209cd7ab | Anthony PERARD | return -1; |
441 | 209cd7ab | Anthony PERARD | } |
442 | d94f9486 | aliguori | } |
443 | d94f9486 | aliguori | |
444 | 209cd7ab | Anthony PERARD | if (xendev->ops->connect) {
|
445 | 209cd7ab | Anthony PERARD | rc = xendev->ops->connect(xendev); |
446 | 209cd7ab | Anthony PERARD | } |
447 | d94f9486 | aliguori | if (rc != 0) { |
448 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 0, "connect() failed\n"); |
449 | 209cd7ab | Anthony PERARD | return rc;
|
450 | d94f9486 | aliguori | } |
451 | d94f9486 | aliguori | |
452 | d94f9486 | aliguori | xen_be_set_state(xendev, XenbusStateConnected); |
453 | d94f9486 | aliguori | return 0; |
454 | d94f9486 | aliguori | } |
455 | d94f9486 | aliguori | |
456 | d94f9486 | aliguori | /*
|
457 | d94f9486 | aliguori | * Teardown connection.
|
458 | d94f9486 | aliguori | *
|
459 | d94f9486 | aliguori | * Goes to Closed when done.
|
460 | d94f9486 | aliguori | */
|
461 | d94f9486 | aliguori | static void xen_be_disconnect(struct XenDevice *xendev, enum xenbus_state state) |
462 | d94f9486 | aliguori | { |
463 | d94f9486 | aliguori | if (xendev->be_state != XenbusStateClosing &&
|
464 | d94f9486 | aliguori | xendev->be_state != XenbusStateClosed && |
465 | 209cd7ab | Anthony PERARD | xendev->ops->disconnect) { |
466 | 209cd7ab | Anthony PERARD | xendev->ops->disconnect(xendev); |
467 | 209cd7ab | Anthony PERARD | } |
468 | 209cd7ab | Anthony PERARD | if (xendev->be_state != state) {
|
469 | d94f9486 | aliguori | xen_be_set_state(xendev, state); |
470 | 209cd7ab | Anthony PERARD | } |
471 | d94f9486 | aliguori | } |
472 | d94f9486 | aliguori | |
473 | d94f9486 | aliguori | /*
|
474 | d94f9486 | aliguori | * Try to reset xendev, for reconnection by another frontend instance.
|
475 | d94f9486 | aliguori | */
|
476 | d94f9486 | aliguori | static int xen_be_try_reset(struct XenDevice *xendev) |
477 | d94f9486 | aliguori | { |
478 | 209cd7ab | Anthony PERARD | if (xendev->fe_state != XenbusStateInitialising) {
|
479 | d94f9486 | aliguori | return -1; |
480 | 209cd7ab | Anthony PERARD | } |
481 | d94f9486 | aliguori | |
482 | d94f9486 | aliguori | xen_be_printf(xendev, 1, "device reset (for re-connect)\n"); |
483 | d94f9486 | aliguori | xen_be_set_state(xendev, XenbusStateInitialising); |
484 | d94f9486 | aliguori | return 0; |
485 | d94f9486 | aliguori | } |
486 | d94f9486 | aliguori | |
487 | d94f9486 | aliguori | /*
|
488 | d94f9486 | aliguori | * state change dispatcher function
|
489 | d94f9486 | aliguori | */
|
490 | d94f9486 | aliguori | void xen_be_check_state(struct XenDevice *xendev) |
491 | d94f9486 | aliguori | { |
492 | d94f9486 | aliguori | int rc = 0; |
493 | d94f9486 | aliguori | |
494 | d94f9486 | aliguori | /* frontend may request shutdown from almost anywhere */
|
495 | d94f9486 | aliguori | if (xendev->fe_state == XenbusStateClosing ||
|
496 | 209cd7ab | Anthony PERARD | xendev->fe_state == XenbusStateClosed) { |
497 | 209cd7ab | Anthony PERARD | xen_be_disconnect(xendev, xendev->fe_state); |
498 | 209cd7ab | Anthony PERARD | return;
|
499 | d94f9486 | aliguori | } |
500 | d94f9486 | aliguori | |
501 | d94f9486 | aliguori | /* check for possible backend state transitions */
|
502 | d94f9486 | aliguori | for (;;) {
|
503 | 209cd7ab | Anthony PERARD | switch (xendev->be_state) {
|
504 | 209cd7ab | Anthony PERARD | case XenbusStateUnknown:
|
505 | 209cd7ab | Anthony PERARD | rc = xen_be_try_setup(xendev); |
506 | 209cd7ab | Anthony PERARD | break;
|
507 | 209cd7ab | Anthony PERARD | case XenbusStateInitialising:
|
508 | 209cd7ab | Anthony PERARD | rc = xen_be_try_init(xendev); |
509 | 209cd7ab | Anthony PERARD | break;
|
510 | 209cd7ab | Anthony PERARD | case XenbusStateInitWait:
|
511 | 209cd7ab | Anthony PERARD | rc = xen_be_try_connect(xendev); |
512 | 209cd7ab | Anthony PERARD | break;
|
513 | d94f9486 | aliguori | case XenbusStateClosed:
|
514 | d94f9486 | aliguori | rc = xen_be_try_reset(xendev); |
515 | d94f9486 | aliguori | break;
|
516 | 209cd7ab | Anthony PERARD | default:
|
517 | 209cd7ab | Anthony PERARD | rc = -1;
|
518 | 209cd7ab | Anthony PERARD | } |
519 | 209cd7ab | Anthony PERARD | if (rc != 0) { |
520 | 209cd7ab | Anthony PERARD | break;
|
521 | 209cd7ab | Anthony PERARD | } |
522 | d94f9486 | aliguori | } |
523 | d94f9486 | aliguori | } |
524 | d94f9486 | aliguori | |
525 | d94f9486 | aliguori | /* ------------------------------------------------------------- */
|
526 | d94f9486 | aliguori | |
527 | d94f9486 | aliguori | static int xenstore_scan(const char *type, int dom, struct XenDevOps *ops) |
528 | d94f9486 | aliguori | { |
529 | d94f9486 | aliguori | struct XenDevice *xendev;
|
530 | d94f9486 | aliguori | char path[XEN_BUFSIZE], token[XEN_BUFSIZE];
|
531 | d94f9486 | aliguori | char **dev = NULL, *dom0; |
532 | d94f9486 | aliguori | unsigned int cdev, j; |
533 | d94f9486 | aliguori | |
534 | d94f9486 | aliguori | /* setup watch */
|
535 | d94f9486 | aliguori | dom0 = xs_get_domain_path(xenstore, 0);
|
536 | d94f9486 | aliguori | snprintf(token, sizeof(token), "be:%p:%d:%p", type, dom, ops); |
537 | d94f9486 | aliguori | snprintf(path, sizeof(path), "%s/backend/%s/%d", dom0, type, dom); |
538 | d94f9486 | aliguori | free(dom0); |
539 | d94f9486 | aliguori | if (!xs_watch(xenstore, path, token)) {
|
540 | 209cd7ab | Anthony PERARD | xen_be_printf(NULL, 0, "xen be: watching backend path (%s) failed\n", path); |
541 | 209cd7ab | Anthony PERARD | return -1; |
542 | d94f9486 | aliguori | } |
543 | d94f9486 | aliguori | |
544 | d94f9486 | aliguori | /* look for backends */
|
545 | d94f9486 | aliguori | dev = xs_directory(xenstore, 0, path, &cdev);
|
546 | 209cd7ab | Anthony PERARD | if (!dev) {
|
547 | 209cd7ab | Anthony PERARD | return 0; |
548 | 209cd7ab | Anthony PERARD | } |
549 | d94f9486 | aliguori | for (j = 0; j < cdev; j++) { |
550 | 209cd7ab | Anthony PERARD | xendev = xen_be_get_xendev(type, dom, atoi(dev[j]), ops); |
551 | 209cd7ab | Anthony PERARD | if (xendev == NULL) { |
552 | 209cd7ab | Anthony PERARD | continue;
|
553 | 209cd7ab | Anthony PERARD | } |
554 | 209cd7ab | Anthony PERARD | xen_be_check_state(xendev); |
555 | d94f9486 | aliguori | } |
556 | d94f9486 | aliguori | free(dev); |
557 | d94f9486 | aliguori | return 0; |
558 | d94f9486 | aliguori | } |
559 | d94f9486 | aliguori | |
560 | d94f9486 | aliguori | static void xenstore_update_be(char *watch, char *type, int dom, |
561 | 209cd7ab | Anthony PERARD | struct XenDevOps *ops)
|
562 | d94f9486 | aliguori | { |
563 | d94f9486 | aliguori | struct XenDevice *xendev;
|
564 | d94f9486 | aliguori | char path[XEN_BUFSIZE], *dom0;
|
565 | d94f9486 | aliguori | unsigned int len, dev; |
566 | d94f9486 | aliguori | |
567 | d94f9486 | aliguori | dom0 = xs_get_domain_path(xenstore, 0);
|
568 | d94f9486 | aliguori | len = snprintf(path, sizeof(path), "%s/backend/%s/%d", dom0, type, dom); |
569 | d94f9486 | aliguori | free(dom0); |
570 | 209cd7ab | Anthony PERARD | if (strncmp(path, watch, len) != 0) { |
571 | 209cd7ab | Anthony PERARD | return;
|
572 | 209cd7ab | Anthony PERARD | } |
573 | d94f9486 | aliguori | if (sscanf(watch+len, "/%u/%255s", &dev, path) != 2) { |
574 | 209cd7ab | Anthony PERARD | strcpy(path, "");
|
575 | 209cd7ab | Anthony PERARD | if (sscanf(watch+len, "/%u", &dev) != 1) { |
576 | 209cd7ab | Anthony PERARD | dev = -1;
|
577 | 209cd7ab | Anthony PERARD | } |
578 | 209cd7ab | Anthony PERARD | } |
579 | 209cd7ab | Anthony PERARD | if (dev == -1) { |
580 | 209cd7ab | Anthony PERARD | return;
|
581 | d94f9486 | aliguori | } |
582 | d94f9486 | aliguori | |
583 | d94f9486 | aliguori | if (0) { |
584 | 209cd7ab | Anthony PERARD | /* FIXME: detect devices being deleted from xenstore ... */
|
585 | 209cd7ab | Anthony PERARD | xen_be_del_xendev(dom, dev); |
586 | d94f9486 | aliguori | } |
587 | d94f9486 | aliguori | |
588 | d94f9486 | aliguori | xendev = xen_be_get_xendev(type, dom, dev, ops); |
589 | d94f9486 | aliguori | if (xendev != NULL) { |
590 | 209cd7ab | Anthony PERARD | xen_be_backend_changed(xendev, path); |
591 | 209cd7ab | Anthony PERARD | xen_be_check_state(xendev); |
592 | d94f9486 | aliguori | } |
593 | d94f9486 | aliguori | } |
594 | d94f9486 | aliguori | |
595 | d94f9486 | aliguori | static void xenstore_update_fe(char *watch, struct XenDevice *xendev) |
596 | d94f9486 | aliguori | { |
597 | d94f9486 | aliguori | char *node;
|
598 | d94f9486 | aliguori | unsigned int len; |
599 | d94f9486 | aliguori | |
600 | d94f9486 | aliguori | len = strlen(xendev->fe); |
601 | 209cd7ab | Anthony PERARD | if (strncmp(xendev->fe, watch, len) != 0) { |
602 | 209cd7ab | Anthony PERARD | return;
|
603 | 209cd7ab | Anthony PERARD | } |
604 | 209cd7ab | Anthony PERARD | if (watch[len] != '/') { |
605 | 209cd7ab | Anthony PERARD | return;
|
606 | 209cd7ab | Anthony PERARD | } |
607 | d94f9486 | aliguori | node = watch + len + 1;
|
608 | d94f9486 | aliguori | |
609 | d94f9486 | aliguori | xen_be_frontend_changed(xendev, node); |
610 | d94f9486 | aliguori | xen_be_check_state(xendev); |
611 | d94f9486 | aliguori | } |
612 | d94f9486 | aliguori | |
613 | d94f9486 | aliguori | static void xenstore_update(void *unused) |
614 | d94f9486 | aliguori | { |
615 | d94f9486 | aliguori | char **vec = NULL; |
616 | d94f9486 | aliguori | intptr_t type, ops, ptr; |
617 | d94f9486 | aliguori | unsigned int dom, count; |
618 | d94f9486 | aliguori | |
619 | d94f9486 | aliguori | vec = xs_read_watch(xenstore, &count); |
620 | 209cd7ab | Anthony PERARD | if (vec == NULL) { |
621 | 209cd7ab | Anthony PERARD | goto cleanup;
|
622 | 209cd7ab | Anthony PERARD | } |
623 | d94f9486 | aliguori | |
624 | d94f9486 | aliguori | if (sscanf(vec[XS_WATCH_TOKEN], "be:%" PRIxPTR ":%d:%" PRIxPTR, |
625 | 209cd7ab | Anthony PERARD | &type, &dom, &ops) == 3) {
|
626 | 209cd7ab | Anthony PERARD | xenstore_update_be(vec[XS_WATCH_PATH], (void*)type, dom, (void*)ops); |
627 | 209cd7ab | Anthony PERARD | } |
628 | 209cd7ab | Anthony PERARD | if (sscanf(vec[XS_WATCH_TOKEN], "fe:%" PRIxPTR, &ptr) == 1) { |
629 | 209cd7ab | Anthony PERARD | xenstore_update_fe(vec[XS_WATCH_PATH], (void*)ptr);
|
630 | 209cd7ab | Anthony PERARD | } |
631 | d94f9486 | aliguori | |
632 | d94f9486 | aliguori | cleanup:
|
633 | 834fac78 | Jean-Christophe DUBOIS | free(vec); |
634 | d94f9486 | aliguori | } |
635 | d94f9486 | aliguori | |
636 | d94f9486 | aliguori | static void xen_be_evtchn_event(void *opaque) |
637 | d94f9486 | aliguori | { |
638 | d94f9486 | aliguori | struct XenDevice *xendev = opaque;
|
639 | d94f9486 | aliguori | evtchn_port_t port; |
640 | d94f9486 | aliguori | |
641 | d94f9486 | aliguori | port = xc_evtchn_pending(xendev->evtchndev); |
642 | d94f9486 | aliguori | if (port != xendev->local_port) {
|
643 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 0, "xc_evtchn_pending returned %d (expected %d)\n", |
644 | 209cd7ab | Anthony PERARD | port, xendev->local_port); |
645 | 209cd7ab | Anthony PERARD | return;
|
646 | d94f9486 | aliguori | } |
647 | d94f9486 | aliguori | xc_evtchn_unmask(xendev->evtchndev, port); |
648 | d94f9486 | aliguori | |
649 | 209cd7ab | Anthony PERARD | if (xendev->ops->event) {
|
650 | 209cd7ab | Anthony PERARD | xendev->ops->event(xendev); |
651 | 209cd7ab | Anthony PERARD | } |
652 | d94f9486 | aliguori | } |
653 | d94f9486 | aliguori | |
654 | d94f9486 | aliguori | /* -------------------------------------------------------------------- */
|
655 | d94f9486 | aliguori | |
656 | d94f9486 | aliguori | int xen_be_init(void) |
657 | d94f9486 | aliguori | { |
658 | d94f9486 | aliguori | xenstore = xs_daemon_open(); |
659 | d94f9486 | aliguori | if (!xenstore) {
|
660 | 209cd7ab | Anthony PERARD | xen_be_printf(NULL, 0, "can't connect to xenstored\n"); |
661 | 209cd7ab | Anthony PERARD | return -1; |
662 | d94f9486 | aliguori | } |
663 | d94f9486 | aliguori | |
664 | 209cd7ab | Anthony PERARD | if (qemu_set_fd_handler(xs_fileno(xenstore), xenstore_update, NULL, NULL) < 0) { |
665 | 209cd7ab | Anthony PERARD | goto err;
|
666 | 209cd7ab | Anthony PERARD | } |
667 | d94f9486 | aliguori | |
668 | d5b93ddf | Anthony PERARD | if (xen_xc == XC_HANDLER_INITIAL_VALUE) {
|
669 | 3285cf4f | Anthony PERARD | /* Check if xen_init() have been called */
|
670 | 209cd7ab | Anthony PERARD | goto err;
|
671 | d94f9486 | aliguori | } |
672 | d94f9486 | aliguori | return 0; |
673 | d94f9486 | aliguori | |
674 | d94f9486 | aliguori | err:
|
675 | d94f9486 | aliguori | qemu_set_fd_handler(xs_fileno(xenstore), NULL, NULL, NULL); |
676 | d94f9486 | aliguori | xs_daemon_close(xenstore); |
677 | d94f9486 | aliguori | xenstore = NULL;
|
678 | d94f9486 | aliguori | |
679 | d94f9486 | aliguori | return -1; |
680 | d94f9486 | aliguori | } |
681 | d94f9486 | aliguori | |
682 | d94f9486 | aliguori | int xen_be_register(const char *type, struct XenDevOps *ops) |
683 | d94f9486 | aliguori | { |
684 | d94f9486 | aliguori | return xenstore_scan(type, xen_domid, ops);
|
685 | d94f9486 | aliguori | } |
686 | d94f9486 | aliguori | |
687 | d94f9486 | aliguori | int xen_be_bind_evtchn(struct XenDevice *xendev) |
688 | d94f9486 | aliguori | { |
689 | 209cd7ab | Anthony PERARD | if (xendev->local_port != -1) { |
690 | 209cd7ab | Anthony PERARD | return 0; |
691 | 209cd7ab | Anthony PERARD | } |
692 | d94f9486 | aliguori | xendev->local_port = xc_evtchn_bind_interdomain |
693 | 209cd7ab | Anthony PERARD | (xendev->evtchndev, xendev->dom, xendev->remote_port); |
694 | d94f9486 | aliguori | if (xendev->local_port == -1) { |
695 | 209cd7ab | Anthony PERARD | xen_be_printf(xendev, 0, "xc_evtchn_bind_interdomain failed\n"); |
696 | 209cd7ab | Anthony PERARD | return -1; |
697 | d94f9486 | aliguori | } |
698 | d94f9486 | aliguori | xen_be_printf(xendev, 2, "bind evtchn port %d\n", xendev->local_port); |
699 | d94f9486 | aliguori | qemu_set_fd_handler(xc_evtchn_fd(xendev->evtchndev), |
700 | 209cd7ab | Anthony PERARD | xen_be_evtchn_event, NULL, xendev);
|
701 | d94f9486 | aliguori | return 0; |
702 | d94f9486 | aliguori | } |
703 | d94f9486 | aliguori | |
704 | d94f9486 | aliguori | void xen_be_unbind_evtchn(struct XenDevice *xendev) |
705 | d94f9486 | aliguori | { |
706 | 209cd7ab | Anthony PERARD | if (xendev->local_port == -1) { |
707 | 209cd7ab | Anthony PERARD | return;
|
708 | 209cd7ab | Anthony PERARD | } |
709 | d94f9486 | aliguori | qemu_set_fd_handler(xc_evtchn_fd(xendev->evtchndev), NULL, NULL, NULL); |
710 | d94f9486 | aliguori | xc_evtchn_unbind(xendev->evtchndev, xendev->local_port); |
711 | d94f9486 | aliguori | xen_be_printf(xendev, 2, "unbind evtchn port %d\n", xendev->local_port); |
712 | d94f9486 | aliguori | xendev->local_port = -1;
|
713 | d94f9486 | aliguori | } |
714 | d94f9486 | aliguori | |
715 | d94f9486 | aliguori | int xen_be_send_notify(struct XenDevice *xendev) |
716 | d94f9486 | aliguori | { |
717 | d94f9486 | aliguori | return xc_evtchn_notify(xendev->evtchndev, xendev->local_port);
|
718 | d94f9486 | aliguori | } |
719 | d94f9486 | aliguori | |
720 | d94f9486 | aliguori | /*
|
721 | d94f9486 | aliguori | * msg_level:
|
722 | d94f9486 | aliguori | * 0 == errors (stderr + logfile).
|
723 | d94f9486 | aliguori | * 1 == informative debug messages (logfile only).
|
724 | d94f9486 | aliguori | * 2 == noisy debug messages (logfile only).
|
725 | d94f9486 | aliguori | * 3 == will flood your log (logfile only).
|
726 | d94f9486 | aliguori | */
|
727 | d94f9486 | aliguori | void xen_be_printf(struct XenDevice *xendev, int msg_level, const char *fmt, ...) |
728 | d94f9486 | aliguori | { |
729 | d94f9486 | aliguori | va_list args; |
730 | d94f9486 | aliguori | |
731 | d94f9486 | aliguori | if (xendev) {
|
732 | 209cd7ab | Anthony PERARD | if (msg_level > xendev->debug) {
|
733 | d94f9486 | aliguori | return;
|
734 | 209cd7ab | Anthony PERARD | } |
735 | d94f9486 | aliguori | qemu_log("xen be: %s: ", xendev->name);
|
736 | 209cd7ab | Anthony PERARD | if (msg_level == 0) { |
737 | d94f9486 | aliguori | fprintf(stderr, "xen be: %s: ", xendev->name);
|
738 | 209cd7ab | Anthony PERARD | } |
739 | d94f9486 | aliguori | } else {
|
740 | 209cd7ab | Anthony PERARD | if (msg_level > debug) {
|
741 | d94f9486 | aliguori | return;
|
742 | 209cd7ab | Anthony PERARD | } |
743 | d94f9486 | aliguori | qemu_log("xen be core: ");
|
744 | 209cd7ab | Anthony PERARD | if (msg_level == 0) { |
745 | d94f9486 | aliguori | fprintf(stderr, "xen be core: ");
|
746 | 209cd7ab | Anthony PERARD | } |
747 | d94f9486 | aliguori | } |
748 | d94f9486 | aliguori | va_start(args, fmt); |
749 | d94f9486 | aliguori | qemu_log_vprintf(fmt, args); |
750 | d94f9486 | aliguori | va_end(args); |
751 | d94f9486 | aliguori | if (msg_level == 0) { |
752 | d94f9486 | aliguori | va_start(args, fmt); |
753 | d94f9486 | aliguori | vfprintf(stderr, fmt, args); |
754 | d94f9486 | aliguori | va_end(args); |
755 | d94f9486 | aliguori | } |
756 | d94f9486 | aliguori | qemu_log_flush(); |
757 | d94f9486 | aliguori | } |