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/ide.h"
  31 #include "hw/pci/pci.h"
  32 #include "hw/irq.h"
  33 #include "hw/xen/xen_common.h"
  34 #include "hw/xen/xen_backend.h"
  35 #include "trace.h"
  36 #include "exec/address-spaces.h"
  37
  38 #include <xenguest.h>
  39
  40 //#define DEBUG_PLATFORM
  41
  42 #ifdef DEBUG_PLATFORM
  43 #define DPRINTF(fmt, ...) do { \
  44     fprintf(stderr, "xen_platform: " fmt, ## __VA_ARGS__); \
  45 } while (0)
  46 #else
  47 #define DPRINTF(fmt, ...) do { } while (0)
  48 #endif
  49
  50 #define PFFLAG_ROM_LOCK 1 /* Sets whether ROM memory area is RW or RO */
  51
  52 typedef struct PCIXenPlatformState {
  53     /*< private >*/
  54     PCIDevice parent_obj;
  55     /*< public >*/
  56
  57     MemoryRegion fixed_io;
  58     MemoryRegion bar;
  59     MemoryRegion mmio_bar;
  60     uint8_t flags; /* used only for version_id == 2 */
  61     int drivers_blacklisted;
  62     uint16_t driver_product_version;
  63
  64     /* Log from guest drivers */
  65     char log_buffer[4096];
  66     int log_buffer_off;
  67 } PCIXenPlatformState;
  68
  69 #define TYPE_XEN_PLATFORM "xen-platform"
  70 #define XEN_PLATFORM(obj) \
  71     OBJECT_CHECK(PCIXenPlatformState, (obj), TYPE_XEN_PLATFORM)
  72
  73 #define XEN_PLATFORM_IOPORT 0x10
  74
  75 /* Send bytes to syslog */
  76 static void log_writeb(PCIXenPlatformState *s, char val)
  77 {
  78     if (val == '\n' || s->log_buffer_off == sizeof(s->log_buffer) - 1) {
  79         /* Flush buffer */
  80         s->log_buffer[s->log_buffer_off] = 0;
  81         trace_xen_platform_log(s->log_buffer);
  82         s->log_buffer_off = 0;
  83     } else {
  84         s->log_buffer[s->log_buffer_off++] = val;
  85     }
  86 }
  87
  88 /* Xen Platform, Fixed IOPort */
  89 #define UNPLUG_ALL_IDE_DISKS 1
  90 #define UNPLUG_ALL_NICS 2
  91 #define UNPLUG_AUX_IDE_DISKS 4
  92
  93 static void unplug_nic(PCIBus *b, PCIDevice *d, void *o)
  94 {
  95     /* We have to ignore passthrough devices */
  96     if (pci_get_word(d->config + PCI_CLASS_DEVICE) ==
  97             PCI_CLASS_NETWORK_ETHERNET
  98             && strcmp(d->name, "xen-pci-passthrough") != 0) {
  99         object_unparent(OBJECT(d));
 100     }
 101 }
 102
 103 static void pci_unplug_nics(PCIBus *bus)
 104 {
 105     pci_for_each_device(bus, 0, unplug_nic, NULL);
 106 }
 107
 108 static void unplug_disks(PCIBus *b, PCIDevice *d, void *o)
 109 {
 110     /* We have to ignore passthrough devices */
 111     if (pci_get_word(d->config + PCI_CLASS_DEVICE) ==
 112             PCI_CLASS_STORAGE_IDE
 113             && strcmp(d->name, "xen-pci-passthrough") != 0) {
 114         pci_piix3_xen_ide_unplug(DEVICE(d));
 115     }
 116 }
 117
 118 static void pci_unplug_disks(PCIBus *bus)
 119 {
 120     pci_for_each_device(bus, 0, unplug_disks, NULL);
 121 }
 122
 123 static void platform_fixed_ioport_writew(void *opaque, uint32_t addr, uint32_t val)
 124 {
 125     PCIXenPlatformState *s = opaque;
 126
 127     switch (addr) {
 128     case 0: {
 129         PCIDevice *pci_dev = PCI_DEVICE(s);
 130         /* Unplug devices.  Value is a bitmask of which devices to
 131            unplug, with bit 0 the IDE devices, bit 1 the network
 132            devices, and bit 2 the non-primary-master IDE devices. */
 133         if (val & UNPLUG_ALL_IDE_DISKS) {
 134             DPRINTF("unplug disks\n");
 135             bdrv_drain_all();
 136             bdrv_flush_all();
 137             pci_unplug_disks(pci_dev->bus);
 138         }
 139         if (val & UNPLUG_ALL_NICS) {
 140             DPRINTF("unplug nics\n");
 141             pci_unplug_nics(pci_dev->bus);
 142         }
 143         if (val & UNPLUG_AUX_IDE_DISKS) {
 144             DPRINTF("unplug auxiliary disks not supported\n");
 145         }
 146         break;
 147     }
 148     case 2:
 149         switch (val) {
 150         case 1:
 151             DPRINTF("Citrix Windows PV drivers loaded in guest\n");
 152             break;
 153         case 0:
 154             DPRINTF("Guest claimed to be running PV product 0?\n");
 155             break;
 156         default:
 157             DPRINTF("Unknown PV product %d loaded in guest\n", val);
 158             break;
 159         }
 160         s->driver_product_version = val;
 161         break;
 162     }
 163 }
 164
 165 static void platform_fixed_ioport_writel(void *opaque, uint32_t addr,
 166                                          uint32_t val)
 167 {
 168     switch (addr) {
 169     case 0:
 170         /* PV driver version */
 171         break;
 172     }
 173 }
 174
 175 static void platform_fixed_ioport_writeb(void *opaque, uint32_t addr, uint32_t val)
 176 {
 177     PCIXenPlatformState *s = opaque;
 178
 179     switch (addr) {
 180     case 0: /* Platform flags */ {
 181         hvmmem_type_t mem_type = (val & PFFLAG_ROM_LOCK) ?
 182             HVMMEM_ram_ro : HVMMEM_ram_rw;
 183         if (xc_hvm_set_mem_type(xen_xc, xen_domid, mem_type, 0xc0, 0x40)) {
 184             DPRINTF("unable to change ro/rw state of ROM memory area!\n");
 185         } else {
 186             s->flags = val & PFFLAG_ROM_LOCK;
 187             DPRINTF("changed ro/rw state of ROM memory area. now is %s state.\n",
 188                     (mem_type == HVMMEM_ram_ro ? "ro":"rw"));
 189         }
 190         break;
 191     }
 192     case 2:
 193         log_writeb(s, val);
 194         break;
 195     }
 196 }
 197
 198 static uint32_t platform_fixed_ioport_readw(void *opaque, uint32_t addr)
 199 {
 200     PCIXenPlatformState *s = opaque;
 201
 202     switch (addr) {
 203     case 0:
 204         if (s->drivers_blacklisted) {
 205             /* The drivers will recognise this magic number and refuse
 206              * to do anything. */
 207             return 0xd249;
 208         } else {
 209             /* Magic value so that you can identify the interface. */
 210             return 0x49d2;
 211         }
 212     default:
 213         return 0xffff;
 214     }
 215 }
 216
 217 static uint32_t platform_fixed_ioport_readb(void *opaque, uint32_t addr)
 218 {
 219     PCIXenPlatformState *s = opaque;
 220
 221     switch (addr) {
 222     case 0:
 223         /* Platform flags */
 224         return s->flags;
 225     case 2:
 226         /* Version number */
 227         return 1;
 228     default:
 229         return 0xff;
 230     }
 231 }
 232
 233 static void platform_fixed_ioport_reset(void *opaque)
 234 {
 235     PCIXenPlatformState *s = opaque;
 236
 237     platform_fixed_ioport_writeb(s, 0, 0);
 238 }
 239
 240 static uint64_t platform_fixed_ioport_read(void *opaque,
 241                                            hwaddr addr,
 242                                            unsigned size)
 243 {
 244     switch (size) {
 245     case 1:
 246         return platform_fixed_ioport_readb(opaque, addr);
 247     case 2:
 248         return platform_fixed_ioport_readw(opaque, addr);
 249     default:
 250         return -1;
 251     }
 252 }
 253
 254 static void platform_fixed_ioport_write(void *opaque, hwaddr addr,
 255
 256                                         uint64_t val, unsigned size)
 257 {
 258     switch (size) {
 259     case 1:
 260         platform_fixed_ioport_writeb(opaque, addr, val);
 261         break;
 262     case 2:
 263         platform_fixed_ioport_writew(opaque, addr, val);
 264         break;
 265     case 4:
 266         platform_fixed_ioport_writel(opaque, addr, val);
 267         break;
 268     }
 269 }
 270
 271
 272 static const MemoryRegionOps platform_fixed_io_ops = {
 273     .read = platform_fixed_ioport_read,
 274     .write = platform_fixed_ioport_write,
 275     .valid = {
 276         .unaligned = true,
 277     },
 278     .impl = {
 279         .min_access_size = 1,
 280         .max_access_size = 4,
 281         .unaligned = true,
 282     },
 283     .endianness = DEVICE_LITTLE_ENDIAN,
 284 };
 285
 286 static void platform_fixed_ioport_init(PCIXenPlatformState* s)
 287 {
 288     memory_region_init_io(&s->fixed_io, OBJECT(s), &platform_fixed_io_ops, s,
 289                           "xen-fixed", 16);
 290     memory_region_add_subregion(get_system_io(), XEN_PLATFORM_IOPORT,
 291                                 &s->fixed_io);
 292 }
 293
 294 /* Xen Platform PCI Device */
 295
 296 static uint64_t xen_platform_ioport_readb(void *opaque, hwaddr addr,
 297                                           unsigned int size)
 298 {
 299     if (addr == 0) {
 300         return platform_fixed_ioport_readb(opaque, 0);
 301     } else {
 302         return ~0u;
 303     }
 304 }
 305
 306 static void xen_platform_ioport_writeb(void *opaque, hwaddr addr,
 307                                        uint64_t val, unsigned int size)
 308 {
 309     PCIXenPlatformState *s = opaque;
 310
 311     switch (addr) {
 312     case 0: /* Platform flags */
 313         platform_fixed_ioport_writeb(opaque, 0, (uint32_t)val);
 314         break;
 315     case 8:
 316         log_writeb(s, (uint32_t)val);
 317         break;
 318     default:
 319         break;
 320     }
 321 }
 322
 323 static const MemoryRegionOps xen_pci_io_ops = {
 324     .read  = xen_platform_ioport_readb,
 325     .write = xen_platform_ioport_writeb,
 326     .impl.min_access_size = 1,
 327     .impl.max_access_size = 1,
 328 };
 329
 330 static void platform_ioport_bar_setup(PCIXenPlatformState *d)
 331 {
 332     memory_region_init_io(&d->bar, OBJECT(d), &xen_pci_io_ops, d,
 333                           "xen-pci", 0x100);
 334 }
 335
 336 static uint64_t platform_mmio_read(void *opaque, hwaddr addr,
 337                                    unsigned size)
 338 {
 339     DPRINTF("Warning: attempted read from physical address "
 340             "0x" TARGET_FMT_plx " in xen platform mmio space\n", addr);
 341
 342     return 0;
 343 }
 344
 345 static void platform_mmio_write(void *opaque, hwaddr addr,
 346                                 uint64_t val, unsigned size)
 347 {
 348     DPRINTF("Warning: attempted write of 0x%"PRIx64" to physical "
 349             "address 0x" TARGET_FMT_plx " in xen platform mmio space\n",
 350             val, addr);
 351 }
 352
 353 static const MemoryRegionOps platform_mmio_handler = {
 354     .read = &platform_mmio_read,
 355     .write = &platform_mmio_write,
 356     .endianness = DEVICE_NATIVE_ENDIAN,
 357 };
 358
 359 static void platform_mmio_setup(PCIXenPlatformState *d)
 360 {
 361     memory_region_init_io(&d->mmio_bar, OBJECT(d), &platform_mmio_handler, d,
 362                           "xen-mmio", 0x1000000);
 363 }
 364
 365 static int xen_platform_post_load(void *opaque, int version_id)
 366 {
 367     PCIXenPlatformState *s = opaque;
 368
 369     platform_fixed_ioport_writeb(s, 0, s->flags);
 370
 371     return 0;
 372 }
 373
 374 static const VMStateDescription vmstate_xen_platform = {
 375     .name = "platform",
 376     .version_id = 4,
 377     .minimum_version_id = 4,
 378     .minimum_version_id_old = 4,
 379     .post_load = xen_platform_post_load,
 380     .fields = (VMStateField []) {
 381         VMSTATE_PCI_DEVICE(parent_obj, PCIXenPlatformState),
 382         VMSTATE_UINT8(flags, PCIXenPlatformState),
 383         VMSTATE_END_OF_LIST()
 384     }
 385 };
 386
 387 static int xen_platform_initfn(PCIDevice *dev)
 388 {
 389     PCIXenPlatformState *d = XEN_PLATFORM(dev);
 390     uint8_t *pci_conf;
 391
 392     pci_conf = dev->config;
 393
 394     pci_set_word(pci_conf + PCI_COMMAND, PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
 395
 396     pci_config_set_prog_interface(pci_conf, 0);
 397
 398     pci_conf[PCI_INTERRUPT_PIN] = 1;
 399
 400     platform_ioport_bar_setup(d);
 401     pci_register_bar(dev, 0, PCI_BASE_ADDRESS_SPACE_IO, &d->bar);
 402
 403     /* reserve 16MB mmio address for share memory*/
 404     platform_mmio_setup(d);
 405     pci_register_bar(dev, 1, PCI_BASE_ADDRESS_MEM_PREFETCH,
 406                      &d->mmio_bar);
 407
 408     platform_fixed_ioport_init(d);
 409
 410     return 0;
 411 }
 412
 413 static void platform_reset(DeviceState *dev)
 414 {
 415     PCIXenPlatformState *s = XEN_PLATFORM(dev);
 416
 417     platform_fixed_ioport_reset(s);
 418 }
 419
 420 static void xen_platform_class_init(ObjectClass *klass, void *data)
 421 {
 422     DeviceClass *dc = DEVICE_CLASS(klass);
 423     PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
 424
 425     k->init = xen_platform_initfn;
 426     k->vendor_id = PCI_VENDOR_ID_XEN;
 427     k->device_id = PCI_DEVICE_ID_XEN_PLATFORM;
 428     k->class_id = PCI_CLASS_OTHERS << 8 | 0x80;
 429     k->subsystem_vendor_id = PCI_VENDOR_ID_XEN;
 430     k->subsystem_id = PCI_DEVICE_ID_XEN_PLATFORM;
 431     k->revision = 1;
 432     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
 433     dc->desc = "XEN platform pci device";
 434     dc->reset = platform_reset;
 435     dc->vmsd = &vmstate_xen_platform;
 436 }
 437
 438 static const TypeInfo xen_platform_info = {
 439     .name          = TYPE_XEN_PLATFORM,
 440     .parent        = TYPE_PCI_DEVICE,
 441     .instance_size = sizeof(PCIXenPlatformState),
 442     .class_init    = xen_platform_class_init,
 443 };
 444
 445 static void xen_platform_register_types(void)
 446 {
 447     type_register_static(&xen_platform_info);
 448 }
 449
 450 type_init(xen_platform_register_types)