qtest.c

   1 /*
   2  * Test Server
   3  *
   4  * Copyright IBM, Corp. 2011
   5  *
   6  * Authors:
   7  *  Anthony Liguori   <aliguori@us.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  *
  12  */
  13
  14 #include "qtest.h"
  15 #include "hw/qdev.h"
  16 #include "qemu-char.h"
  17 #include "exec/ioport.h"
  18 #include "exec/memory.h"
  19 #include "hw/irq.h"
  20 #include "sysemu.h"
  21 #include "cpus.h"
  22
  23 #define MAX_IRQ 256
  24
  25 const char *qtest_chrdev;
  26 const char *qtest_log;
  27 int qtest_allowed = 0;
  28
  29 static DeviceState *irq_intercept_dev;
  30 static FILE *qtest_log_fp;
  31 static CharDriverState *qtest_chr;
  32 static GString *inbuf;
  33 static int irq_levels[MAX_IRQ];
  34 static qemu_timeval start_time;
  35 static bool qtest_opened;
  36
  37 #define FMT_timeval "%ld.%06ld"
  38
  39 /**
  40  * QTest Protocol
  41  *
  42  * Line based protocol, request/response based.  Server can send async messages
  43  * so clients should always handle many async messages before the response
  44  * comes in.
  45  *
  46  * Valid requests
  47  *
  48  * Clock management:
  49  *
  50  * The qtest client is completely in charge of the vm_clock.  qtest commands
  51  * let you adjust the value of the clock (monotonically).  All the commands
  52  * return the current value of the clock in nanoseconds.
  53  *
  54  *  > clock_step
  55  *  < OK VALUE
  56  *
  57  *     Advance the clock to the next deadline.  Useful when waiting for
  58  *     asynchronous events.
  59  *
  60  *  > clock_step NS
  61  *  < OK VALUE
  62  *
  63  *     Advance the clock by NS nanoseconds.
  64  *
  65  *  > clock_set NS
  66  *  < OK VALUE
  67  *
  68  *     Advance the clock to NS nanoseconds (do nothing if it's already past).
  69  *
  70  * PIO and memory access:
  71  *
  72  *  > outb ADDR VALUE
  73  *  < OK
  74  *
  75  *  > outw ADDR VALUE
  76  *  < OK
  77  *
  78  *  > outl ADDR VALUE
  79  *  < OK
  80  *
  81  *  > inb ADDR
  82  *  < OK VALUE
  83  *
  84  *  > inw ADDR
  85  *  < OK VALUE
  86  *
  87  *  > inl ADDR
  88  *  < OK VALUE
  89  *
  90  *  > read ADDR SIZE
  91  *  < OK DATA
  92  *
  93  *  > write ADDR SIZE DATA
  94  *  < OK
  95  *
  96  * ADDR, SIZE, VALUE are all integers parsed with strtoul() with a base of 0.
  97  *
  98  * DATA is an arbitrarily long hex number prefixed with '0x'.  If it's smaller
  99  * than the expected size, the value will be zero filled at the end of the data
 100  * sequence.
 101  *
 102  * IRQ management:
 103  *
 104  *  > irq_intercept_in QOM-PATH
 105  *  < OK
 106  *
 107  *  > irq_intercept_out QOM-PATH
 108  *  < OK
 109  *
 110  * Attach to the gpio-in (resp. gpio-out) pins exported by the device at
 111  * QOM-PATH.  When the pin is triggered, one of the following async messages
 112  * will be printed to the qtest stream:
 113  *
 114  *  IRQ raise NUM
 115  *  IRQ lower NUM
 116  *
 117  * where NUM is an IRQ number.  For the PC, interrupts can be intercepted
 118  * simply with "irq_intercept_in ioapic" (note that IRQ0 comes out with
 119  * NUM=0 even though it is remapped to GSI 2).
 120  */
 121
 122 static int hex2nib(char ch)
 123 {
 124     if (ch >= '0' && ch <= '9') {
 125         return ch - '0';
 126     } else if (ch >= 'a' && ch <= 'f') {
 127         return 10 + (ch - 'a');
 128     } else if (ch >= 'A' && ch <= 'F') {
 129         return 10 + (ch - 'a');
 130     } else {
 131         return -1;
 132     }
 133 }
 134
 135 static void qtest_get_time(qemu_timeval *tv)
 136 {
 137     qemu_gettimeofday(tv);
 138     tv->tv_sec -= start_time.tv_sec;
 139     tv->tv_usec -= start_time.tv_usec;
 140     if (tv->tv_usec < 0) {
 141         tv->tv_usec += 1000000;
 142         tv->tv_sec -= 1;
 143     }
 144 }
 145
 146 static void qtest_send_prefix(CharDriverState *chr)
 147 {
 148     qemu_timeval tv;
 149
 150     if (!qtest_log_fp || !qtest_opened) {
 151         return;
 152     }
 153
 154     qtest_get_time(&tv);
 155     fprintf(qtest_log_fp, "[S +" FMT_timeval "] ",
 156             tv.tv_sec, (long) tv.tv_usec);
 157 }
 158
 159 static void GCC_FMT_ATTR(2, 3) qtest_send(CharDriverState *chr,
 160                                           const char *fmt, ...)
 161 {
 162     va_list ap;
 163     char buffer[1024];
 164     size_t len;
 165
 166     va_start(ap, fmt);
 167     len = vsnprintf(buffer, sizeof(buffer), fmt, ap);
 168     va_end(ap);
 169
 170     qemu_chr_fe_write(chr, (uint8_t *)buffer, len);
 171     if (qtest_log_fp && qtest_opened) {
 172         fprintf(qtest_log_fp, "%s", buffer);
 173     }
 174 }
 175
 176 static void qtest_irq_handler(void *opaque, int n, int level)
 177 {
 178     qemu_irq *old_irqs = opaque;
 179     qemu_set_irq(old_irqs[n], level);
 180
 181     if (irq_levels[n] != level) {
 182         CharDriverState *chr = qtest_chr;
 183         irq_levels[n] = level;
 184         qtest_send_prefix(chr);
 185         qtest_send(chr, "IRQ %s %d\n",
 186                    level ? "raise" : "lower", n);
 187     }
 188 }
 189
 190 static void qtest_process_command(CharDriverState *chr, gchar **words)
 191 {
 192     const gchar *command;
 193
 194     g_assert(words);
 195
 196     command = words[0];
 197
 198     if (qtest_log_fp) {
 199         qemu_timeval tv;
 200         int i;
 201
 202         qtest_get_time(&tv);
 203         fprintf(qtest_log_fp, "[R +" FMT_timeval "]",
 204                 tv.tv_sec, (long) tv.tv_usec);
 205         for (i = 0; words[i]; i++) {
 206             fprintf(qtest_log_fp, " %s", words[i]);
 207         }
 208         fprintf(qtest_log_fp, "\n");
 209     }
 210
 211     g_assert(command);
 212     if (strcmp(words[0], "irq_intercept_out") == 0
 213         || strcmp(words[0], "irq_intercept_in") == 0) {
 214         DeviceState *dev;
 215
 216         g_assert(words[1]);
 217         dev = DEVICE(object_resolve_path(words[1], NULL));
 218         if (!dev) {
 219             qtest_send_prefix(chr);
 220             qtest_send(chr, "FAIL Unknown device\n");
 221             return;
 222         }
 223
 224         if (irq_intercept_dev) {
 225             qtest_send_prefix(chr);
 226             if (irq_intercept_dev != dev) {
 227                 qtest_send(chr, "FAIL IRQ intercept already enabled\n");
 228             } else {
 229                 qtest_send(chr, "OK\n");
 230             }
 231             return;
 232         }
 233
 234         if (words[0][14] == 'o') {
 235             qemu_irq_intercept_out(&dev->gpio_out, qtest_irq_handler, dev->num_gpio_out);
 236         } else {
 237             qemu_irq_intercept_in(dev->gpio_in, qtest_irq_handler, dev->num_gpio_in);
 238         }
 239         irq_intercept_dev = dev;
 240         qtest_send_prefix(chr);
 241         qtest_send(chr, "OK\n");
 242
 243     } else if (strcmp(words[0], "outb") == 0 ||
 244                strcmp(words[0], "outw") == 0 ||
 245                strcmp(words[0], "outl") == 0) {
 246         uint16_t addr;
 247         uint32_t value;
 248
 249         g_assert(words[1] && words[2]);
 250         addr = strtol(words[1], NULL, 0);
 251         value = strtol(words[2], NULL, 0);
 252
 253         if (words[0][3] == 'b') {
 254             cpu_outb(addr, value);
 255         } else if (words[0][3] == 'w') {
 256             cpu_outw(addr, value);
 257         } else if (words[0][3] == 'l') {
 258             cpu_outl(addr, value);
 259         }
 260         qtest_send_prefix(chr);
 261         qtest_send(chr, "OK\n");
 262     } else if (strcmp(words[0], "inb") == 0 ||
 263         strcmp(words[0], "inw") == 0 ||
 264         strcmp(words[0], "inl") == 0) {
 265         uint16_t addr;
 266         uint32_t value = -1U;
 267
 268         g_assert(words[1]);
 269         addr = strtol(words[1], NULL, 0);
 270
 271         if (words[0][2] == 'b') {
 272             value = cpu_inb(addr);
 273         } else if (words[0][2] == 'w') {
 274             value = cpu_inw(addr);
 275         } else if (words[0][2] == 'l') {
 276             value = cpu_inl(addr);
 277         }
 278         qtest_send_prefix(chr);
 279         qtest_send(chr, "OK 0x%04x\n", value);
 280     } else if (strcmp(words[0], "read") == 0) {
 281         uint64_t addr, len, i;
 282         uint8_t *data;
 283
 284         g_assert(words[1] && words[2]);
 285         addr = strtoul(words[1], NULL, 0);
 286         len = strtoul(words[2], NULL, 0);
 287
 288         data = g_malloc(len);
 289         cpu_physical_memory_read(addr, data, len);
 290
 291         qtest_send_prefix(chr);
 292         qtest_send(chr, "OK 0x");
 293         for (i = 0; i < len; i++) {
 294             qtest_send(chr, "%02x", data[i]);
 295         }
 296         qtest_send(chr, "\n");
 297
 298         g_free(data);
 299     } else if (strcmp(words[0], "write") == 0) {
 300         uint64_t addr, len, i;
 301         uint8_t *data;
 302         size_t data_len;
 303
 304         g_assert(words[1] && words[2] && words[3]);
 305         addr = strtoul(words[1], NULL, 0);
 306         len = strtoul(words[2], NULL, 0);
 307
 308         data_len = strlen(words[3]);
 309         if (data_len < 3) {
 310             qtest_send(chr, "ERR invalid argument size\n");
 311             return;
 312         }
 313
 314         data = g_malloc(len);
 315         for (i = 0; i < len; i++) {
 316             if ((i * 2 + 4) <= data_len) {
 317                 data[i] = hex2nib(words[3][i * 2 + 2]) << 4;
 318                 data[i] |= hex2nib(words[3][i * 2 + 3]);
 319             } else {
 320                 data[i] = 0;
 321             }
 322         }
 323         cpu_physical_memory_write(addr, data, len);
 324         g_free(data);
 325
 326         qtest_send_prefix(chr);
 327         qtest_send(chr, "OK\n");
 328     } else if (strcmp(words[0], "clock_step") == 0) {
 329         int64_t ns;
 330
 331         if (words[1]) {
 332             ns = strtoll(words[1], NULL, 0);
 333         } else {
 334             ns = qemu_clock_deadline(vm_clock);
 335         }
 336         qtest_clock_warp(qemu_get_clock_ns(vm_clock) + ns);
 337         qtest_send_prefix(chr);
 338         qtest_send(chr, "OK %"PRIi64"\n", (int64_t)qemu_get_clock_ns(vm_clock));
 339     } else if (strcmp(words[0], "clock_set") == 0) {
 340         int64_t ns;
 341
 342         g_assert(words[1]);
 343         ns = strtoll(words[1], NULL, 0);
 344         qtest_clock_warp(ns);
 345         qtest_send_prefix(chr);
 346         qtest_send(chr, "OK %"PRIi64"\n", (int64_t)qemu_get_clock_ns(vm_clock));
 347     } else {
 348         qtest_send_prefix(chr);
 349         qtest_send(chr, "FAIL Unknown command `%s'\n", words[0]);
 350     }
 351 }
 352
 353 static void qtest_process_inbuf(CharDriverState *chr, GString *inbuf)
 354 {
 355     char *end;
 356
 357     while ((end = strchr(inbuf->str, '\n')) != NULL) {
 358         size_t offset;
 359         GString *cmd;
 360         gchar **words;
 361
 362         offset = end - inbuf->str;
 363
 364         cmd = g_string_new_len(inbuf->str, offset);
 365         g_string_erase(inbuf, 0, offset + 1);
 366
 367         words = g_strsplit(cmd->str, " ", 0);
 368         qtest_process_command(chr, words);
 369         g_strfreev(words);
 370
 371         g_string_free(cmd, TRUE);
 372     }
 373 }
 374
 375 static void qtest_read(void *opaque, const uint8_t *buf, int size)
 376 {
 377     CharDriverState *chr = opaque;
 378
 379     g_string_append_len(inbuf, (const gchar *)buf, size);
 380     qtest_process_inbuf(chr, inbuf);
 381 }
 382
 383 static int qtest_can_read(void *opaque)
 384 {
 385     return 1024;
 386 }
 387
 388 static void qtest_event(void *opaque, int event)
 389 {
 390     int i;
 391
 392     switch (event) {
 393     case CHR_EVENT_OPENED:
 394         qemu_system_reset(false);
 395         for (i = 0; i < ARRAY_SIZE(irq_levels); i++) {
 396             irq_levels[i] = 0;
 397         }
 398         qemu_gettimeofday(&start_time);
 399         qtest_opened = true;
 400         if (qtest_log_fp) {
 401             fprintf(qtest_log_fp, "[I " FMT_timeval "] OPENED\n",
 402                     start_time.tv_sec, (long) start_time.tv_usec);
 403         }
 404         break;
 405     case CHR_EVENT_CLOSED:
 406         qtest_opened = false;
 407         if (qtest_log_fp) {
 408             qemu_timeval tv;
 409             qtest_get_time(&tv);
 410             fprintf(qtest_log_fp, "[I +" FMT_timeval "] CLOSED\n",
 411                     tv.tv_sec, (long) tv.tv_usec);
 412         }
 413         break;
 414     default:
 415         break;
 416     }
 417 }
 418
 419 int qtest_init(void)
 420 {
 421     CharDriverState *chr;
 422
 423     g_assert(qtest_chrdev != NULL);
 424
 425     configure_icount("0");
 426     chr = qemu_chr_new("qtest", qtest_chrdev, NULL);
 427
 428     qemu_chr_add_handlers(chr, qtest_can_read, qtest_read, qtest_event, chr);
 429     qemu_chr_fe_set_echo(chr, true);
 430
 431     inbuf = g_string_new("");
 432
 433     if (qtest_log) {
 434         if (strcmp(qtest_log, "none") != 0) {
 435             qtest_log_fp = fopen(qtest_log, "w+");
 436         }
 437     } else {
 438         qtest_log_fp = stderr;
 439     }
 440
 441     qtest_chr = chr;
 442
 443     return 0;
 444 }