hw/ipmi/ipmi_bmc_extern.c

   1 /*
   2  * IPMI BMC external connection
   3  *
   4  * Copyright (c) 2015 Corey Minyard, MontaVista Software, LLC
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24
  25 /*
  26  * This is designed to connect with OpenIPMI's lanserv serial interface
  27  * using the "VM" connection type.  See that for details.
  28  */
  29
  30 #include "qemu/osdep.h"
  31 #include "qapi/error.h"
  32 #include "qemu/timer.h"
  33 #include "sysemu/char.h"
  34 #include "sysemu/sysemu.h"
  35 #include "hw/ipmi/ipmi.h"
  36
  37 #define VM_MSG_CHAR        0xA0 /* Marks end of message */
  38 #define VM_CMD_CHAR        0xA1 /* Marks end of a command */
  39 #define VM_ESCAPE_CHAR     0xAA /* Set bit 4 from the next byte to 0 */
  40
  41 #define VM_PROTOCOL_VERSION        1
  42 #define VM_CMD_VERSION             0xff /* A version number byte follows */
  43 #define VM_CMD_NOATTN              0x00
  44 #define VM_CMD_ATTN                0x01
  45 #define VM_CMD_ATTN_IRQ            0x02
  46 #define VM_CMD_POWEROFF            0x03
  47 #define VM_CMD_RESET               0x04
  48 #define VM_CMD_ENABLE_IRQ          0x05 /* Enable/disable the messaging irq */
  49 #define VM_CMD_DISABLE_IRQ         0x06
  50 #define VM_CMD_SEND_NMI            0x07
  51 #define VM_CMD_CAPABILITIES        0x08
  52 #define   VM_CAPABILITIES_POWER    0x01
  53 #define   VM_CAPABILITIES_RESET    0x02
  54 #define   VM_CAPABILITIES_IRQ      0x04
  55 #define   VM_CAPABILITIES_NMI      0x08
  56 #define   VM_CAPABILITIES_ATTN     0x10
  57 #define VM_CMD_FORCEOFF            0x09
  58
  59 #define TYPE_IPMI_BMC_EXTERN "ipmi-bmc-extern"
  60 #define IPMI_BMC_EXTERN(obj) OBJECT_CHECK(IPMIBmcExtern, (obj), \
  61                                         TYPE_IPMI_BMC_EXTERN)
  62 typedef struct IPMIBmcExtern {
  63     IPMIBmc parent;
  64
  65     CharDriverState *chr;
  66
  67     bool connected;
  68
  69     unsigned char inbuf[MAX_IPMI_MSG_SIZE + 2];
  70     unsigned int inpos;
  71     bool in_escape;
  72     bool in_too_many;
  73     bool waiting_rsp;
  74     bool sending_cmd;
  75
  76     unsigned char outbuf[(MAX_IPMI_MSG_SIZE + 2) * 2 + 1];
  77     unsigned int outpos;
  78     unsigned int outlen;
  79
  80     struct QEMUTimer *extern_timer;
  81
  82     /* A reset event is pending to be sent upstream. */
  83     bool send_reset;
  84 } IPMIBmcExtern;
  85
  86 static int can_receive(void *opaque);
  87 static void receive(void *opaque, const uint8_t *buf, int size);
  88 static void chr_event(void *opaque, int event);
  89
  90 static unsigned char
  91 ipmb_checksum(const unsigned char *data, int size, unsigned char start)
  92 {
  93         unsigned char csum = start;
  94
  95         for (; size > 0; size--, data++) {
  96                 csum += *data;
  97         }
  98         return csum;
  99 }
 100
 101 static void continue_send(IPMIBmcExtern *ibe)
 102 {
 103     if (ibe->outlen == 0) {
 104         goto check_reset;
 105     }
 106  send:
 107     ibe->outpos += qemu_chr_fe_write(ibe->chr, ibe->outbuf + ibe->outpos,
 108                                      ibe->outlen - ibe->outpos);
 109     if (ibe->outpos < ibe->outlen) {
 110         /* Not fully transmitted, try again in a 10ms */
 111         timer_mod_ns(ibe->extern_timer,
 112                      qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 10000000);
 113     } else {
 114         /* Sent */
 115         ibe->outlen = 0;
 116         ibe->outpos = 0;
 117         if (!ibe->sending_cmd) {
 118             ibe->waiting_rsp = true;
 119         } else {
 120             ibe->sending_cmd = false;
 121         }
 122     check_reset:
 123         if (ibe->connected && ibe->send_reset) {
 124             /* Send the reset */
 125             ibe->outbuf[0] = VM_CMD_RESET;
 126             ibe->outbuf[1] = VM_CMD_CHAR;
 127             ibe->outlen = 2;
 128             ibe->outpos = 0;
 129             ibe->send_reset = false;
 130             ibe->sending_cmd = true;
 131             goto send;
 132         }
 133
 134         if (ibe->waiting_rsp) {
 135             /* Make sure we get a response within 4 seconds. */
 136             timer_mod_ns(ibe->extern_timer,
 137                          qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + 4000000000ULL);
 138         }
 139     }
 140     return;
 141 }
 142
 143 static void extern_timeout(void *opaque)
 144 {
 145     IPMIBmcExtern *ibe = opaque;
 146     IPMIInterface *s = ibe->parent.intf;
 147
 148     if (ibe->connected) {
 149         if (ibe->waiting_rsp && (ibe->outlen == 0)) {
 150             IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
 151             /* The message response timed out, return an error. */
 152             ibe->waiting_rsp = false;
 153             ibe->inbuf[1] = ibe->outbuf[1] | 0x04;
 154             ibe->inbuf[2] = ibe->outbuf[2];
 155             ibe->inbuf[3] = IPMI_CC_TIMEOUT;
 156             k->handle_rsp(s, ibe->outbuf[0], ibe->inbuf + 1, 3);
 157         } else {
 158             continue_send(ibe);
 159         }
 160     }
 161 }
 162
 163 static void addchar(IPMIBmcExtern *ibe, unsigned char ch)
 164 {
 165     switch (ch) {
 166     case VM_MSG_CHAR:
 167     case VM_CMD_CHAR:
 168     case VM_ESCAPE_CHAR:
 169         ibe->outbuf[ibe->outlen] = VM_ESCAPE_CHAR;
 170         ibe->outlen++;
 171         ch |= 0x10;
 172         /* No break */
 173
 174     default:
 175         ibe->outbuf[ibe->outlen] = ch;
 176         ibe->outlen++;
 177     }
 178 }
 179
 180 static void ipmi_bmc_extern_handle_command(IPMIBmc *b,
 181                                        uint8_t *cmd, unsigned int cmd_len,
 182                                        unsigned int max_cmd_len,
 183                                        uint8_t msg_id)
 184 {
 185     IPMIBmcExtern *ibe = IPMI_BMC_EXTERN(b);
 186     IPMIInterface *s = ibe->parent.intf;
 187     uint8_t err = 0, csum;
 188     unsigned int i;
 189
 190     if (ibe->outlen) {
 191         /* We already have a command queued.  Shouldn't ever happen. */
 192         fprintf(stderr, "IPMI KCS: Got command when not finished with the"
 193                 " previous commmand\n");
 194         abort();
 195     }
 196
 197     /* If it's too short or it was truncated, return an error. */
 198     if (cmd_len < 2) {
 199         err = IPMI_CC_REQUEST_DATA_LENGTH_INVALID;
 200     } else if ((cmd_len > max_cmd_len) || (cmd_len > MAX_IPMI_MSG_SIZE)) {
 201         err = IPMI_CC_REQUEST_DATA_TRUNCATED;
 202     } else if (!ibe->connected) {
 203         err = IPMI_CC_BMC_INIT_IN_PROGRESS;
 204     }
 205     if (err) {
 206         IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
 207         unsigned char rsp[3];
 208         rsp[0] = cmd[0] | 0x04;
 209         rsp[1] = cmd[1];
 210         rsp[2] = err;
 211         ibe->waiting_rsp = false;
 212         k->handle_rsp(s, msg_id, rsp, 3);
 213         goto out;
 214     }
 215
 216     addchar(ibe, msg_id);
 217     for (i = 0; i < cmd_len; i++) {
 218         addchar(ibe, cmd[i]);
 219     }
 220     csum = ipmb_checksum(&msg_id, 1, 0);
 221     addchar(ibe, -ipmb_checksum(cmd, cmd_len, csum));
 222
 223     ibe->outbuf[ibe->outlen] = VM_MSG_CHAR;
 224     ibe->outlen++;
 225
 226     /* Start the transmit */
 227     continue_send(ibe);
 228
 229  out:
 230     return;
 231 }
 232
 233 static void handle_hw_op(IPMIBmcExtern *ibe, unsigned char hw_op)
 234 {
 235     IPMIInterface *s = ibe->parent.intf;
 236     IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
 237
 238     switch (hw_op) {
 239     case VM_CMD_VERSION:
 240         /* We only support one version at this time. */
 241         break;
 242
 243     case VM_CMD_NOATTN:
 244         k->set_atn(s, 0, 0);
 245         break;
 246
 247     case VM_CMD_ATTN:
 248         k->set_atn(s, 1, 0);
 249         break;
 250
 251     case VM_CMD_ATTN_IRQ:
 252         k->set_atn(s, 1, 1);
 253         break;
 254
 255     case VM_CMD_POWEROFF:
 256         k->do_hw_op(s, IPMI_POWEROFF_CHASSIS, 0);
 257         break;
 258
 259     case VM_CMD_RESET:
 260         k->do_hw_op(s, IPMI_RESET_CHASSIS, 0);
 261         break;
 262
 263     case VM_CMD_ENABLE_IRQ:
 264         k->set_irq_enable(s, 1);
 265         break;
 266
 267     case VM_CMD_DISABLE_IRQ:
 268         k->set_irq_enable(s, 0);
 269         break;
 270
 271     case VM_CMD_SEND_NMI:
 272         k->do_hw_op(s, IPMI_SEND_NMI, 0);
 273         break;
 274
 275     case VM_CMD_FORCEOFF:
 276         qemu_system_shutdown_request();
 277         break;
 278     }
 279 }
 280
 281 static void handle_msg(IPMIBmcExtern *ibe)
 282 {
 283     IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(ibe->parent.intf);
 284
 285     if (ibe->in_escape) {
 286         ipmi_debug("msg escape not ended\n");
 287         return;
 288     }
 289     if (ibe->inpos < 5) {
 290         ipmi_debug("msg too short\n");
 291         return;
 292     }
 293     if (ibe->in_too_many) {
 294         ibe->inbuf[3] = IPMI_CC_REQUEST_DATA_TRUNCATED;
 295         ibe->inpos = 4;
 296     } else if (ipmb_checksum(ibe->inbuf, ibe->inpos, 0) != 0) {
 297         ipmi_debug("msg checksum failure\n");
 298         return;
 299     } else {
 300         ibe->inpos--; /* Remove checkum */
 301     }
 302
 303     timer_del(ibe->extern_timer);
 304     ibe->waiting_rsp = false;
 305     k->handle_rsp(ibe->parent.intf, ibe->inbuf[0], ibe->inbuf + 1, ibe->inpos - 1);
 306 }
 307
 308 static int can_receive(void *opaque)
 309 {
 310     return 1;
 311 }
 312
 313 static void receive(void *opaque, const uint8_t *buf, int size)
 314 {
 315     IPMIBmcExtern *ibe = opaque;
 316     int i;
 317     unsigned char hw_op;
 318
 319     for (i = 0; i < size; i++) {
 320         unsigned char ch = buf[i];
 321
 322         switch (ch) {
 323         case VM_MSG_CHAR:
 324             handle_msg(ibe);
 325             ibe->in_too_many = false;
 326             ibe->inpos = 0;
 327             break;
 328
 329         case VM_CMD_CHAR:
 330             if (ibe->in_too_many) {
 331                 ipmi_debug("cmd in too many\n");
 332                 ibe->in_too_many = false;
 333                 ibe->inpos = 0;
 334                 break;
 335             }
 336             if (ibe->in_escape) {
 337                 ipmi_debug("cmd in escape\n");
 338                 ibe->in_too_many = false;
 339                 ibe->inpos = 0;
 340                 ibe->in_escape = false;
 341                 break;
 342             }
 343             ibe->in_too_many = false;
 344             if (ibe->inpos < 1) {
 345                 break;
 346             }
 347             hw_op = ibe->inbuf[0];
 348             ibe->inpos = 0;
 349             goto out_hw_op;
 350             break;
 351
 352         case VM_ESCAPE_CHAR:
 353             ibe->in_escape = true;
 354             break;
 355
 356         default:
 357             if (ibe->in_escape) {
 358                 ch &= ~0x10;
 359                 ibe->in_escape = false;
 360             }
 361             if (ibe->in_too_many) {
 362                 break;
 363             }
 364             if (ibe->inpos >= sizeof(ibe->inbuf)) {
 365                 ibe->in_too_many = true;
 366                 break;
 367             }
 368             ibe->inbuf[ibe->inpos] = ch;
 369             ibe->inpos++;
 370             break;
 371         }
 372     }
 373     return;
 374
 375  out_hw_op:
 376     handle_hw_op(ibe, hw_op);
 377 }
 378
 379 static void chr_event(void *opaque, int event)
 380 {
 381     IPMIBmcExtern *ibe = opaque;
 382     IPMIInterface *s = ibe->parent.intf;
 383     IPMIInterfaceClass *k = IPMI_INTERFACE_GET_CLASS(s);
 384     unsigned char v;
 385
 386     switch (event) {
 387     case CHR_EVENT_OPENED:
 388         ibe->connected = true;
 389         ibe->outpos = 0;
 390         ibe->outlen = 0;
 391         addchar(ibe, VM_CMD_VERSION);
 392         addchar(ibe, VM_PROTOCOL_VERSION);
 393         ibe->outbuf[ibe->outlen] = VM_CMD_CHAR;
 394         ibe->outlen++;
 395         addchar(ibe, VM_CMD_CAPABILITIES);
 396         v = VM_CAPABILITIES_IRQ | VM_CAPABILITIES_ATTN;
 397         if (k->do_hw_op(ibe->parent.intf, IPMI_POWEROFF_CHASSIS, 1) == 0) {
 398             v |= VM_CAPABILITIES_POWER;
 399         }
 400         if (k->do_hw_op(ibe->parent.intf, IPMI_RESET_CHASSIS, 1) == 0) {
 401             v |= VM_CAPABILITIES_RESET;
 402         }
 403         if (k->do_hw_op(ibe->parent.intf, IPMI_SEND_NMI, 1) == 0) {
 404             v |= VM_CAPABILITIES_NMI;
 405         }
 406         addchar(ibe, v);
 407         ibe->outbuf[ibe->outlen] = VM_CMD_CHAR;
 408         ibe->outlen++;
 409         ibe->sending_cmd = false;
 410         continue_send(ibe);
 411         break;
 412
 413     case CHR_EVENT_CLOSED:
 414         if (!ibe->connected) {
 415             return;
 416         }
 417         ibe->connected = false;
 418         if (ibe->waiting_rsp) {
 419             ibe->waiting_rsp = false;
 420             ibe->inbuf[1] = ibe->outbuf[1] | 0x04;
 421             ibe->inbuf[2] = ibe->outbuf[2];
 422             ibe->inbuf[3] = IPMI_CC_BMC_INIT_IN_PROGRESS;
 423             k->handle_rsp(s, ibe->outbuf[0], ibe->inbuf + 1, 3);
 424         }
 425         break;
 426     }
 427 }
 428
 429 static void ipmi_bmc_extern_handle_reset(IPMIBmc *b)
 430 {
 431     IPMIBmcExtern *ibe = IPMI_BMC_EXTERN(b);
 432
 433     ibe->send_reset = true;
 434     continue_send(ibe);
 435 }
 436
 437 static void ipmi_bmc_extern_realize(DeviceState *dev, Error **errp)
 438 {
 439     IPMIBmcExtern *ibe = IPMI_BMC_EXTERN(dev);
 440
 441     if (!ibe->chr) {
 442         error_setg(errp, "IPMI external bmc requires chardev attribute");
 443         return;
 444     }
 445
 446     qemu_chr_add_handlers(ibe->chr, can_receive, receive, chr_event, ibe);
 447 }
 448
 449 static int ipmi_bmc_extern_post_migrate(void *opaque, int version_id)
 450 {
 451     IPMIBmcExtern *ibe = opaque;
 452
 453     /*
 454      * We don't directly restore waiting_rsp, Instead, we return an
 455      * error on the interface if a response was being waited for.
 456      */
 457     if (ibe->waiting_rsp) {
 458         IPMIInterface *ii = ibe->parent.intf;
 459         IPMIInterfaceClass *iic = IPMI_INTERFACE_GET_CLASS(ii);
 460
 461         ibe->waiting_rsp = false;
 462         ibe->inbuf[1] = ibe->outbuf[1] | 0x04;
 463         ibe->inbuf[2] = ibe->outbuf[2];
 464         ibe->inbuf[3] = IPMI_CC_BMC_INIT_IN_PROGRESS;
 465         iic->handle_rsp(ii, ibe->outbuf[0], ibe->inbuf + 1, 3);
 466     }
 467     return 0;
 468 }
 469
 470 static const VMStateDescription vmstate_ipmi_bmc_extern = {
 471     .name = TYPE_IPMI_BMC_EXTERN,
 472     .version_id = 1,
 473     .minimum_version_id = 1,
 474     .post_load = ipmi_bmc_extern_post_migrate,
 475     .fields      = (VMStateField[]) {
 476         VMSTATE_BOOL(send_reset, IPMIBmcExtern),
 477         VMSTATE_BOOL(waiting_rsp, IPMIBmcExtern),
 478         VMSTATE_END_OF_LIST()
 479     }
 480 };
 481
 482 static void ipmi_bmc_extern_init(Object *obj)
 483 {
 484     IPMIBmcExtern *ibe = IPMI_BMC_EXTERN(obj);
 485
 486     ibe->extern_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, extern_timeout, ibe);
 487     vmstate_register(NULL, 0, &vmstate_ipmi_bmc_extern, ibe);
 488 }
 489
 490 static Property ipmi_bmc_extern_properties[] = {
 491     DEFINE_PROP_CHR("chardev", IPMIBmcExtern, chr),
 492     DEFINE_PROP_END_OF_LIST(),
 493 };
 494
 495 static void ipmi_bmc_extern_class_init(ObjectClass *oc, void *data)
 496 {
 497     DeviceClass *dc = DEVICE_CLASS(oc);
 498     IPMIBmcClass *bk = IPMI_BMC_CLASS(oc);
 499
 500     bk->handle_command = ipmi_bmc_extern_handle_command;
 501     bk->handle_reset = ipmi_bmc_extern_handle_reset;
 502     dc->realize = ipmi_bmc_extern_realize;
 503     dc->props = ipmi_bmc_extern_properties;
 504 }
 505
 506 static const TypeInfo ipmi_bmc_extern_type = {
 507     .name          = TYPE_IPMI_BMC_EXTERN,
 508     .parent        = TYPE_IPMI_BMC,
 509     .instance_size = sizeof(IPMIBmcExtern),
 510     .instance_init = ipmi_bmc_extern_init,
 511     .class_init    = ipmi_bmc_extern_class_init,
 512  };
 513
 514 static void ipmi_bmc_extern_register_types(void)
 515 {
 516     type_register_static(&ipmi_bmc_extern_type);
 517 }
 518
 519 type_init(ipmi_bmc_extern_register_types)