| 1 | /* |
| 2 | * Xen para-virtualization device |
| 3 | * |
| 4 | * (c) 2008 Gerd Hoffmann <kraxel@redhat.com> |
| 5 | * |
| 6 | * This library is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU Lesser General Public |
| 8 | * License as published by the Free Software Foundation; either |
| 9 | * version 2.1 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * This library is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * Lesser General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU Lesser General Public |
| 17 | * License along with this library; if not, see <http://www.gnu.org/licenses/> |
| 18 | */ |
| 19 | |
| 20 | #include "qemu/osdep.h" |
| 21 | #include "qemu/log.h" |
| 22 | #include "qemu/main-loop.h" |
| 23 | #include "hw/core/qdev.h" |
| 24 | #include "hw/xen/xen-legacy-backend.h" |
| 25 | #include "hw/xen/xen-bus-helper.h" |
| 26 | #include "hw/xen/xen_pvdev.h" |
| 27 | |
| 28 | /* private */ |
| 29 | static int debug; |
| 30 | |
| 31 | struct xs_dirs { |
| 32 | char *xs_dir; |
| 33 | QTAILQ_ENTRY(xs_dirs) list; |
| 34 | }; |
| 35 | |
| 36 | static QTAILQ_HEAD(, xs_dirs) xs_cleanup = |
| 37 | QTAILQ_HEAD_INITIALIZER(xs_cleanup); |
| 38 | |
| 39 | static QTAILQ_HEAD(, XenLegacyDevice) xendevs = |
| 40 | QTAILQ_HEAD_INITIALIZER(xendevs); |
| 41 | |
| 42 | /* ------------------------------------------------------------- */ |
| 43 | |
| 44 | static void xenstore_cleanup_dir(char *dir) |
| 45 | { |
| 46 | struct xs_dirs *d; |
| 47 | |
| 48 | d = g_malloc(sizeof(*d)); |
| 49 | d->xs_dir = dir; |
| 50 | QTAILQ_INSERT_TAIL(&xs_cleanup, d, list); |
| 51 | } |
| 52 | |
| 53 | void xen_config_cleanup(void) |
| 54 | { |
| 55 | struct xs_dirs *d; |
| 56 | |
| 57 | QTAILQ_FOREACH(d, &xs_cleanup, list) { |
| 58 | qemu_xen_xs_destroy(xenstore, 0, d->xs_dir); |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | int xenstore_mkdir(char *path, int p) |
| 63 | { |
| 64 | if (!qemu_xen_xs_create(xenstore, 0, 0, xen_domid, p, path)) { |
| 65 | xen_pv_printf(NULL, 0, "xs_mkdir %s: failed\n", path); |
| 66 | return -1; |
| 67 | } |
| 68 | xenstore_cleanup_dir(g_strdup(path)); |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | int xenstore_write_str(const char *base, const char *node, const char *val) |
| 73 | { |
| 74 | char abspath[XEN_BUFSIZE]; |
| 75 | |
| 76 | snprintf(abspath, sizeof(abspath), "%s/%s", base, node); |
| 77 | if (!qemu_xen_xs_write(xenstore, 0, abspath, val, strlen(val))) { |
| 78 | return -1; |
| 79 | } |
| 80 | return 0; |
| 81 | } |
| 82 | |
| 83 | char *xenstore_read_str(const char *base, const char *node) |
| 84 | { |
| 85 | char *str, *ret = NULL; |
| 86 | |
| 87 | str = xs_node_read(xenstore, 0, NULL, NULL, "%s/%s", base, node); |
| 88 | if (str != NULL) { |
| 89 | /* move to qemu-allocated memory to make sure |
| 90 | * callers can safely g_free() stuff. */ |
| 91 | ret = g_strdup(str); |
| 92 | free(str); |
| 93 | } |
| 94 | return ret; |
| 95 | } |
| 96 | |
| 97 | int xenstore_write_int(const char *base, const char *node, int ival) |
| 98 | { |
| 99 | char val[12]; |
| 100 | |
| 101 | snprintf(val, sizeof(val), "%d", ival); |
| 102 | return xenstore_write_str(base, node, val); |
| 103 | } |
| 104 | |
| 105 | int xenstore_write_int64(const char *base, const char *node, int64_t ival) |
| 106 | { |
| 107 | char val[21]; |
| 108 | |
| 109 | snprintf(val, sizeof(val), "%"PRId64, ival); |
| 110 | return xenstore_write_str(base, node, val); |
| 111 | } |
| 112 | |
| 113 | int xenstore_read_int(const char *base, const char *node, int *ival) |
| 114 | { |
| 115 | char *val; |
| 116 | int rc = -1; |
| 117 | |
| 118 | val = xenstore_read_str(base, node); |
| 119 | if (val && 1 == sscanf(val, "%d", ival)) { |
| 120 | rc = 0; |
| 121 | } |
| 122 | g_free(val); |
| 123 | return rc; |
| 124 | } |
| 125 | |
| 126 | int xenstore_read_uint64(const char *base, const char *node, uint64_t *uval) |
| 127 | { |
| 128 | char *val; |
| 129 | int rc = -1; |
| 130 | |
| 131 | val = xenstore_read_str(base, node); |
| 132 | if (val && 1 == sscanf(val, "%"SCNu64, uval)) { |
| 133 | rc = 0; |
| 134 | } |
| 135 | g_free(val); |
| 136 | return rc; |
| 137 | } |
| 138 | |
| 139 | const char *xenbus_strstate(enum xenbus_state state) |
| 140 | { |
| 141 | static const char *const name[] = { |
| 142 | [XenbusStateUnknown] = "Unknown", |
| 143 | [XenbusStateInitialising] = "Initialising", |
| 144 | [XenbusStateInitWait] = "InitWait", |
| 145 | [XenbusStateInitialised] = "Initialised", |
| 146 | [XenbusStateConnected] = "Connected", |
| 147 | [XenbusStateClosing] = "Closing", |
| 148 | [XenbusStateClosed] = "Closed", |
| 149 | }; |
| 150 | return (state < ARRAY_SIZE(name)) ? name[state] : "INVALID"; |
| 151 | } |
| 152 | |
| 153 | /* |
| 154 | * msg_level: |
| 155 | * 0 == errors (stderr + logfile). |
| 156 | * 1 == informative debug messages (logfile only). |
| 157 | * 2 == noisy debug messages (logfile only). |
| 158 | * 3 == will flood your log (logfile only). |
| 159 | */ |
| 160 | G_GNUC_PRINTF(3, 0) |
| 161 | static void xen_pv_output_msg(struct XenLegacyDevice *xendev, |
| 162 | FILE *f, const char *fmt, va_list args) |
| 163 | { |
| 164 | if (xendev) { |
| 165 | fprintf(f, "xen be: %s: ", xendev->name); |
| 166 | } else { |
| 167 | fprintf(f, "xen be core: "); |
| 168 | } |
| 169 | vfprintf(f, fmt, args); |
| 170 | } |
| 171 | |
| 172 | void xen_pv_printf(struct XenLegacyDevice *xendev, int msg_level, |
| 173 | const char *fmt, ...) |
| 174 | { |
| 175 | FILE *logfile; |
| 176 | va_list args; |
| 177 | |
| 178 | if (msg_level > (xendev ? xendev->debug : debug)) { |
| 179 | return; |
| 180 | } |
| 181 | |
| 182 | logfile = qemu_log_trylock(); |
| 183 | if (logfile) { |
| 184 | va_start(args, fmt); |
| 185 | xen_pv_output_msg(xendev, logfile, fmt, args); |
| 186 | va_end(args); |
| 187 | qemu_log_unlock(logfile); |
| 188 | } |
| 189 | |
| 190 | if (msg_level == 0) { |
| 191 | va_start(args, fmt); |
| 192 | xen_pv_output_msg(xendev, stderr, fmt, args); |
| 193 | va_end(args); |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | void xen_pv_evtchn_event(void *opaque) |
| 198 | { |
| 199 | struct XenLegacyDevice *xendev = opaque; |
| 200 | evtchn_port_t port; |
| 201 | |
| 202 | port = qemu_xen_evtchn_pending(xendev->evtchndev); |
| 203 | if (port != xendev->local_port) { |
| 204 | xen_pv_printf(xendev, 0, |
| 205 | "xenevtchn_pending returned %d (expected %d)\n", |
| 206 | port, xendev->local_port); |
| 207 | return; |
| 208 | } |
| 209 | qemu_xen_evtchn_unmask(xendev->evtchndev, port); |
| 210 | |
| 211 | if (xendev->ops->event) { |
| 212 | xendev->ops->event(xendev); |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | void xen_pv_unbind_evtchn(struct XenLegacyDevice *xendev) |
| 217 | { |
| 218 | if (xendev->local_port == -1) { |
| 219 | return; |
| 220 | } |
| 221 | qemu_set_fd_handler(qemu_xen_evtchn_fd(xendev->evtchndev), NULL, NULL, NULL); |
| 222 | qemu_xen_evtchn_unbind(xendev->evtchndev, xendev->local_port); |
| 223 | xen_pv_printf(xendev, 2, "unbind evtchn port %d\n", xendev->local_port); |
| 224 | xendev->local_port = -1; |
| 225 | } |
| 226 | |
| 227 | int xen_pv_send_notify(struct XenLegacyDevice *xendev) |
| 228 | { |
| 229 | return qemu_xen_evtchn_notify(xendev->evtchndev, xendev->local_port); |
| 230 | } |
| 231 | |
| 232 | /* ------------------------------------------------------------- */ |
| 233 | |
| 234 | struct XenLegacyDevice *xen_pv_find_xendev(const char *type, int dom, int dev) |
| 235 | { |
| 236 | struct XenLegacyDevice *xendev; |
| 237 | |
| 238 | QTAILQ_FOREACH(xendev, &xendevs, next) { |
| 239 | if (xendev->dom != dom) { |
| 240 | continue; |
| 241 | } |
| 242 | if (xendev->dev != dev) { |
| 243 | continue; |
| 244 | } |
| 245 | if (strcmp(xendev->type, type) != 0) { |
| 246 | continue; |
| 247 | } |
| 248 | return xendev; |
| 249 | } |
| 250 | return NULL; |
| 251 | } |
| 252 | |
| 253 | /* |
| 254 | * release xen backend device. |
| 255 | */ |
| 256 | void xen_pv_del_xendev(struct XenLegacyDevice *xendev) |
| 257 | { |
| 258 | if (xendev->ops->free) { |
| 259 | xendev->ops->free(xendev); |
| 260 | } |
| 261 | |
| 262 | if (xendev->fe) { |
| 263 | qemu_xen_xs_unwatch(xenstore, xendev->watch); |
| 264 | g_free(xendev->fe); |
| 265 | } |
| 266 | |
| 267 | if (xendev->evtchndev != NULL) { |
| 268 | qemu_xen_evtchn_close(xendev->evtchndev); |
| 269 | } |
| 270 | if (xendev->gnttabdev != NULL) { |
| 271 | qemu_xen_gnttab_close(xendev->gnttabdev); |
| 272 | } |
| 273 | |
| 274 | QTAILQ_REMOVE(&xendevs, xendev, next); |
| 275 | |
| 276 | qdev_unplug(DEVICE(xendev), NULL); |
| 277 | } |
| 278 | |
| 279 | void xen_pv_insert_xendev(struct XenLegacyDevice *xendev) |
| 280 | { |
| 281 | QTAILQ_INSERT_TAIL(&xendevs, xendev, next); |
| 282 | } |