hw/xen/xen_platform.c

   1 /*
   2  * XEN platform pci device, formerly known as the event channel device
   3  *
   4  * Copyright (c) 2003-2004 Intel Corp.
   5  * Copyright (c) 2006 XenSource
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a copy
   8  * of this software and associated documentation files (the "Software"), to deal
   9  * in the Software without restriction, including without limitation the rights
  10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11  * copies of the Software, and to permit persons to whom the Software is
  12  * furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included in
  15  * all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  23  * THE SOFTWARE.
  24  */
  25
  26 #include <assert.h>
  27
  28 #include "hw/hw.h"
  29 #include "hw/i386/pc.h"
  30 #include "hw/pci/pci.h"
  31 #include "hw/irq.h"
  32 #include "hw/xen/xen_common.h"
  33 #include "hw/xen/xen_backend.h"
  34 #include "trace.h"
  35 #include "exec/address-spaces.h"
  36
  37 #include <xenguest.h>
  38
  39 //#define DEBUG_PLATFORM
  40
  41 #ifdef DEBUG_PLATFORM
  42 #define DPRINTF(fmt, ...) do { \
  43     fprintf(stderr, "xen_platform: " fmt, ## __VA_ARGS__); \
  44 } while (0)
  45 #else
  46 #define DPRINTF(fmt, ...) do { } while (0)
  47 #endif
  48
  49 #define PFFLAG_ROM_LOCK 1 /* Sets whether ROM memory area is RW or RO */
  50
  51 typedef struct PCIXenPlatformState {
  52     /*< private >*/
  53     PCIDevice parent_obj;
  54     /*< public >*/
  55
  56     MemoryRegion fixed_io;
  57     MemoryRegion bar;
  58     MemoryRegion mmio_bar;
  59     uint8_t flags; /* used only for version_id == 2 */
  60     int drivers_blacklisted;
  61     uint16_t driver_product_version;
  62
  63     /* Log from guest drivers */
  64     char log_buffer[4096];
  65     int log_buffer_off;
  66 } PCIXenPlatformState;
  67
  68 #define TYPE_XEN_PLATFORM "xen-platform"
  69 #define XEN_PLATFORM(obj) \
  70     OBJECT_CHECK(PCIXenPlatformState, (obj), TYPE_XEN_PLATFORM)
  71
  72 #define XEN_PLATFORM_IOPORT 0x10
  73
  74 /* Send bytes to syslog */
  75 static void log_writeb(PCIXenPlatformState *s, char val)
  76 {
  77     if (val == '\n' || s->log_buffer_off == sizeof(s->log_buffer) - 1) {
  78         /* Flush buffer */
  79         s->log_buffer[s->log_buffer_off] = 0;
  80         trace_xen_platform_log(s->log_buffer);
  81         s->log_buffer_off = 0;
  82     } else {
  83         s->log_buffer[s->log_buffer_off++] = val;
  84     }
  85 }
  86
  87 /* Xen Platform, Fixed IOPort */
  88 #define UNPLUG_ALL_IDE_DISKS 1
  89 #define UNPLUG_ALL_NICS 2
  90 #define UNPLUG_AUX_IDE_DISKS 4
  91
  92 static void unplug_nic(PCIBus *b, PCIDevice *d, void *o)
  93 {
  94     /* We have to ignore passthrough devices */
  95     if (pci_get_word(d->config + PCI_CLASS_DEVICE) ==
  96             PCI_CLASS_NETWORK_ETHERNET
  97             && strcmp(d->name, "xen-pci-passthrough") != 0) {
  98         object_unparent(OBJECT(d));
  99     }
 100 }
 101
 102 static void pci_unplug_nics(PCIBus *bus)
 103 {
 104     pci_for_each_device(bus, 0, unplug_nic, NULL);
 105 }
 106
 107 static void unplug_disks(PCIBus *b, PCIDevice *d, void *o)
 108 {
 109     /* We have to ignore passthrough devices */
 110     if (pci_get_word(d->config + PCI_CLASS_DEVICE) ==
 111             PCI_CLASS_STORAGE_IDE
 112             && strcmp(d->name, "xen-pci-passthrough") != 0) {
 113         qdev_unplug(DEVICE(d), NULL);
 114     }
 115 }
 116
 117 static void pci_unplug_disks(PCIBus *bus)
 118 {
 119     pci_for_each_device(bus, 0, unplug_disks, NULL);
 120 }
 121
 122 static void platform_fixed_ioport_writew(void *opaque, uint32_t addr, uint32_t val)
 123 {
 124     PCIXenPlatformState *s = opaque;
 125
 126     switch (addr) {
 127     case 0: {
 128         PCIDevice *pci_dev = PCI_DEVICE(s);
 129         /* Unplug devices.  Value is a bitmask of which devices to
 130            unplug, with bit 0 the IDE devices, bit 1 the network
 131            devices, and bit 2 the non-primary-master IDE devices. */
 132         if (val & UNPLUG_ALL_IDE_DISKS) {
 133             DPRINTF("unplug disks\n");
 134             bdrv_drain_all();
 135             bdrv_flush_all();
 136             pci_unplug_disks(pci_dev->bus);
 137         }
 138         if (val & UNPLUG_ALL_NICS) {
 139             DPRINTF("unplug nics\n");
 140             pci_unplug_nics(pci_dev->bus);
 141         }
 142         if (val & UNPLUG_AUX_IDE_DISKS) {
 143             DPRINTF("unplug auxiliary disks not supported\n");
 144         }
 145         break;
 146     }
 147     case 2:
 148         switch (val) {
 149         case 1:
 150             DPRINTF("Citrix Windows PV drivers loaded in guest\n");
 151             break;
 152         case 0:
 153             DPRINTF("Guest claimed to be running PV product 0?\n");
 154             break;
 155         default:
 156             DPRINTF("Unknown PV product %d loaded in guest\n", val);
 157             break;
 158         }
 159         s->driver_product_version = val;
 160         break;
 161     }
 162 }
 163
 164 static void platform_fixed_ioport_writel(void *opaque, uint32_t addr,
 165                                          uint32_t val)
 166 {
 167     switch (addr) {
 168     case 0:
 169         /* PV driver version */
 170         break;
 171     }
 172 }
 173
 174 static void platform_fixed_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)
 175 {
 176     PCIXenPlatformState *s = opaque;
 177
 178     switch (addr) {
 179     case 0: /* Platform flags */ {
 180         hvmmem_type_t mem_type = (val & PFFLAG_ROM_LOCK) ?
 181             HVMMEM_ram_ro : HVMMEM_ram_rw;
 182         if (xc_hvm_set_mem_type(xen_xc, xen_domid, mem_type, 0xc0, 0x40)) {
 183             DPRINTF("unable to change ro/rw state of ROM memory area!\n");
 184         } else {
 185             s->flags = val & PFFLAG_ROM_LOCK;
 186             DPRINTF("changed ro/rw state of ROM memory area. now is %s state.\n",
 187                     (mem_type == HVMMEM_ram_ro ? "ro":"rw"));
 188         }
 189         break;
 190     }
 191     case 2:
 192         log_writeb(s, val);
 193         break;
 194     }
 195 }
 196
 197 static uint32_t platform_fixed_ioport_readw(void *opaque, uint32_t addr)
 198 {
 199     PCIXenPlatformState *s = opaque;
 200
 201     switch (addr) {
 202     case 0:
 203         if (s->drivers_blacklisted) {
 204             /* The drivers will recognise this magic number and refuse
 205              * to do anything. */
 206             return 0xd249;
 207         } else {
 208             /* Magic value so that you can identify the interface. */
 209             return 0x49d2;
 210         }
 211     default:
 212         return 0xffff;
 213     }
 214 }
 215
 216 static uint32_t platform_fixed_ioport_readb(void *opaque, uint32_t addr)
 217 {
 218     PCIXenPlatformState *s = opaque;
 219
 220     switch (addr) {
 221     case 0:
 222         /* Platform flags */
 223         return s->flags;
 224     case 2:
 225         /* Version number */
 226         return 1;
 227     default:
 228         return 0xff;
 229     }
 230 }
 231
 232 static void platform_fixed_ioport_reset(void *opaque)
 233 {
 234     PCIXenPlatformState *s = opaque;
 235
 236     platform_fixed_ioport_writeb(s, 0, 0);
 237 }
 238
 239 static uint64_t platform_fixed_ioport_read(void *opaque,
 240                                            hwaddr addr,
 241                                            unsigned size)
 242 {
 243     switch (size) {
 244     case 1:
 245         return platform_fixed_ioport_readb(opaque, addr);
 246     case 2:
 247         return platform_fixed_ioport_readw(opaque, addr);
 248     default:
 249         return -1;
 250     }
 251 }
 252
 253 static void platform_fixed_ioport_write(void *opaque, hwaddr addr,
 254
 255                                         uint64_t val, unsigned size)
 256 {
 257     switch (size) {
 258     case 1:
 259         platform_fixed_ioport_writeb(opaque, addr, val);
 260         break;
 261     case 2:
 262         platform_fixed_ioport_writew(opaque, addr, val);
 263         break;
 264     case 4:
 265         platform_fixed_ioport_writel(opaque, addr, val);
 266         break;
 267     }
 268 }
 269
 270
 271 static const MemoryRegionOps platform_fixed_io_ops = {
 272     .read = platform_fixed_ioport_read,
 273     .write = platform_fixed_ioport_write,
 274     .valid = {
 275         .unaligned = true,
 276     },
 277     .impl = {
 278         .min_access_size = 1,
 279         .max_access_size = 4,
 280         .unaligned = true,
 281     },
 282     .endianness = DEVICE_LITTLE_ENDIAN,
 283 };
 284
 285 static void platform_fixed_ioport_init(PCIXenPlatformState* s)
 286 {
 287     memory_region_init_io(&s->fixed_io, OBJECT(s), &platform_fixed_io_ops, s,
 288                           "xen-fixed", 16);
 289     memory_region_add_subregion(get_system_io(), XEN_PLATFORM_IOPORT,
 290                                 &s->fixed_io);
 291 }
 292
 293 /* Xen Platform PCI Device */
 294
 295 static uint64_t xen_platform_ioport_readb(void *opaque, hwaddr addr,
 296                                           unsigned int size)
 297 {
 298     if (addr == 0) {
 299         return platform_fixed_ioport_readb(opaque, 0);
 300     } else {
 301         return ~0u;
 302     }
 303 }
 304
 305 static void xen_platform_ioport_writeb(void *opaque, hwaddr addr,
 306                                        uint64_t val, unsigned int size)
 307 {
 308     PCIXenPlatformState *s = opaque;
 309
 310     switch (addr) {
 311     case 0: /* Platform flags */
 312         platform_fixed_ioport_writeb(opaque, 0, (uint32_t)val);
 313         break;
 314     case 8:
 315         log_writeb(s, (uint32_t)val);
 316         break;
 317     default:
 318         break;
 319     }
 320 }
 321
 322 static const MemoryRegionOps xen_pci_io_ops = {
 323     .read  = xen_platform_ioport_readb,
 324     .write = xen_platform_ioport_writeb,
 325     .impl.min_access_size = 1,
 326     .impl.max_access_size = 1,
 327 };
 328
 329 static void platform_ioport_bar_setup(PCIXenPlatformState *d)
 330 {
 331     memory_region_init_io(&d->bar, OBJECT(d), &xen_pci_io_ops, d,
 332                           "xen-pci", 0x100);
 333 }
 334
 335 static uint64_t platform_mmio_read(void *opaque, hwaddr addr,
 336                                    unsigned size)
 337 {
 338     DPRINTF("Warning: attempted read from physical address "
 339             "0x" TARGET_FMT_plx " in xen platform mmio space\n", addr);
 340
 341     return 0;
 342 }
 343
 344 static void platform_mmio_write(void *opaque, hwaddr addr,
 345                                 uint64_t val, unsigned size)
 346 {
 347     DPRINTF("Warning: attempted write of 0x%"PRIx64" to physical "
 348             "address 0x" TARGET_FMT_plx " in xen platform mmio space\n",
 349             val, addr);
 350 }
 351
 352 static const MemoryRegionOps platform_mmio_handler = {
 353     .read = &platform_mmio_read,
 354     .write = &platform_mmio_write,
 355     .endianness = DEVICE_NATIVE_ENDIAN,
 356 };
 357
 358 static void platform_mmio_setup(PCIXenPlatformState *d)
 359 {
 360     memory_region_init_io(&d->mmio_bar, OBJECT(d), &platform_mmio_handler, d,
 361                           "xen-mmio", 0x1000000);
 362 }
 363
 364 static int xen_platform_post_load(void *opaque, int version_id)
 365 {
 366     PCIXenPlatformState *s = opaque;
 367
 368     platform_fixed_ioport_writeb(s, 0, s->flags);
 369
 370     return 0;
 371 }
 372
 373 static const VMStateDescription vmstate_xen_platform = {
 374     .name = "platform",
 375     .version_id = 4,
 376     .minimum_version_id = 4,
 377     .minimum_version_id_old = 4,
 378     .post_load = xen_platform_post_load,
 379     .fields = (VMStateField []) {
 380         VMSTATE_PCI_DEVICE(parent_obj, PCIXenPlatformState),
 381         VMSTATE_UINT8(flags, PCIXenPlatformState),
 382         VMSTATE_END_OF_LIST()
 383     }
 384 };
 385
 386 static int xen_platform_initfn(PCIDevice *dev)
 387 {
 388     PCIXenPlatformState *d = XEN_PLATFORM(dev);
 389     uint8_t *pci_conf;
 390
 391     pci_conf = dev->config;
 392
 393     pci_set_word(pci_conf + PCI_COMMAND, PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
 394
 395     pci_config_set_prog_interface(pci_conf, 0);
 396
 397     pci_conf[PCI_INTERRUPT_PIN] = 1;
 398
 399     platform_ioport_bar_setup(d);
 400     pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_IO, &d->bar);
 401
 402     /* reserve 16MB mmio address for share memory*/
 403     platform_mmio_setup(d);
 404     pci_register_bar(dev, 1, PCI_BASE_ADDRESS_MEM_PREFETCH,
 405                      &d->mmio_bar);
 406
 407     platform_fixed_ioport_init(d);
 408
 409     return 0;
 410 }
 411
 412 static void platform_reset(DeviceState *dev)
 413 {
 414     PCIXenPlatformState *s = XEN_PLATFORM(dev);
 415
 416     platform_fixed_ioport_reset(s);
 417 }
 418
 419 static void xen_platform_class_init(ObjectClass *klass, void *data)
 420 {
 421     DeviceClass *dc = DEVICE_CLASS(klass);
 422     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 423
 424     k->init = xen_platform_initfn;
 425     k->vendor_id = PCI_VENDOR_ID_XEN;
 426     k->device_id = PCI_DEVICE_ID_XEN_PLATFORM;
 427     k->class_id = PCI_CLASS_OTHERS << 8 | 0x80;
 428     k->subsystem_vendor_id = PCI_VENDOR_ID_XEN;
 429     k->subsystem_id = PCI_DEVICE_ID_XEN_PLATFORM;
 430     k->revision = 1;
 431     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 432     dc->desc = "XEN platform pci device";
 433     dc->reset = platform_reset;
 434     dc->vmsd = &vmstate_xen_platform;
 435 }
 436
 437 static const TypeInfo xen_platform_info = {
 438     .name          = TYPE_XEN_PLATFORM,
 439     .parent        = TYPE_PCI_DEVICE,
 440     .instance_size = sizeof(PCIXenPlatformState),
 441     .class_init    = xen_platform_class_init,
 442 };
 443
 444 static void xen_platform_register_types(void)
 445 {
 446     type_register_static(&xen_platform_info);
 447 }
 448
 449 type_init(xen_platform_register_types)