hw/pci/pci_host.c

   1 /*
   2  * pci_host.c
   3  *
   4  * Copyright (c) 2009 Isaku Yamahata <yamahata at valinux co jp>
   5  *                    VA Linux Systems Japan K.K.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, see <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include "hw/pci/pci.h"
  23 #include "hw/pci/pci_bridge.h"
  24 #include "hw/pci/pci_host.h"
  25 #include "hw/qdev-properties.h"
  26 #include "qemu/module.h"
  27 #include "hw/pci/pci_bus.h"
  28 #include "migration/vmstate.h"
  29 #include "trace.h"
  30
  31 /* debug PCI */
  32 //#define DEBUG_PCI
  33
  34 #ifdef DEBUG_PCI
  35 #define PCI_DPRINTF(fmt, ...) \
  36 do { printf("pci_host_data: " fmt , ## __VA_ARGS__); } while (0)
  37 #else
  38 #define PCI_DPRINTF(fmt, ...)
  39 #endif
  40
  41 /*
  42  * PCI address
  43  * bit 16 - 24: bus number
  44  * bit  8 - 15: devfun number
  45  * bit  0 -  7: offset in configuration space of a given pci device
  46  */
  47
  48 /* the helper function to get a PCIDevice* for a given pci address */
  49 static inline PCIDevice *pci_dev_find_by_addr(PCIBus *bus, uint32_t addr)
  50 {
  51     uint8_t bus_num = addr >> 16;
  52     uint8_t devfn = addr >> 8;
  53
  54     return pci_find_device(bus, bus_num, devfn);
  55 }
  56
  57 static void pci_adjust_config_limit(PCIBus *bus, uint32_t *limit)
  58 {
  59     if ((*limit > PCI_CONFIG_SPACE_SIZE) &&
  60         !pci_bus_allows_extended_config_space(bus)) {
  61         *limit = PCI_CONFIG_SPACE_SIZE;
  62     }
  63 }
  64
  65 static bool is_pci_dev_ejected(PCIDevice *pci_dev)
  66 {
  67     /*
  68      * device unplug was requested and the guest acked it,
  69      * so we stop responding config accesses even if the
  70      * device is not deleted (failover flow)
  71      */
  72     return pci_dev && pci_dev->partially_hotplugged &&
  73            !pci_dev->qdev.pending_deleted_event;
  74 }
  75
  76 void pci_host_config_write_common(PCIDevice *pci_dev, uint32_t addr,
  77                                   uint32_t limit, uint32_t val, uint32_t len)
  78 {
  79     pci_adjust_config_limit(pci_get_bus(pci_dev), &limit);
  80     if (limit <= addr) {
  81         return;
  82     }
  83
  84     assert(len <= 4);
  85     /* non-zero functions are only exposed when function 0 is present,
  86      * allowing direct removal of unexposed functions.
  87      */
  88     if ((pci_dev->qdev.hotplugged && !pci_get_function_0(pci_dev)) ||
  89         !pci_dev->has_power || is_pci_dev_ejected(pci_dev)) {
  90         return;
  91     }
  92
  93     trace_pci_cfg_write(pci_dev->name, pci_dev_bus_num(pci_dev),
  94                         PCI_SLOT(pci_dev->devfn),
  95                         PCI_FUNC(pci_dev->devfn), addr, val);
  96     pci_dev->config_write(pci_dev, addr, val, MIN(len, limit - addr));
  97 }
  98
  99 uint32_t pci_host_config_read_common(PCIDevice *pci_dev, uint32_t addr,
 100                                      uint32_t limit, uint32_t len)
 101 {
 102     uint32_t ret;
 103
 104     pci_adjust_config_limit(pci_get_bus(pci_dev), &limit);
 105     if (limit <= addr) {
 106         return ~0x0;
 107     }
 108
 109     assert(len <= 4);
 110     /* non-zero functions are only exposed when function 0 is present,
 111      * allowing direct removal of unexposed functions.
 112      */
 113     if ((pci_dev->qdev.hotplugged && !pci_get_function_0(pci_dev)) ||
 114         !pci_dev->has_power || is_pci_dev_ejected(pci_dev)) {
 115         return ~0x0;
 116     }
 117
 118     ret = pci_dev->config_read(pci_dev, addr, MIN(len, limit - addr));
 119     trace_pci_cfg_read(pci_dev->name, pci_dev_bus_num(pci_dev),
 120                        PCI_SLOT(pci_dev->devfn),
 121                        PCI_FUNC(pci_dev->devfn), addr, ret);
 122
 123     return ret;
 124 }
 125
 126 void pci_data_write(PCIBus *s, uint32_t addr, uint32_t val, unsigned len)
 127 {
 128     PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
 129     uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);
 130
 131     if (!pci_dev) {
 132         trace_pci_cfg_write("empty", extract32(addr, 16, 8),
 133                             extract32(addr, 11, 5), extract32(addr, 8, 3),
 134                             config_addr, val);
 135         return;
 136     }
 137
 138     pci_host_config_write_common(pci_dev, config_addr, PCI_CONFIG_SPACE_SIZE,
 139                                  val, len);
 140 }
 141
 142 uint32_t pci_data_read(PCIBus *s, uint32_t addr, unsigned len)
 143 {
 144     PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
 145     uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);
 146
 147     if (!pci_dev) {
 148         trace_pci_cfg_read("empty", extract32(addr, 16, 8),
 149                            extract32(addr, 11, 5), extract32(addr, 8, 3),
 150                            config_addr, ~0x0);
 151         return ~0x0;
 152     }
 153
 154     return pci_host_config_read_common(pci_dev, config_addr,
 155                                        PCI_CONFIG_SPACE_SIZE, len);
 156 }
 157
 158 static void pci_host_config_write(void *opaque, hwaddr addr,
 159                                   uint64_t val, unsigned len)
 160 {
 161     PCIHostState *s = opaque;
 162
 163     PCI_DPRINTF("%s addr " HWADDR_FMT_plx " len %d val %"PRIx64"\n",
 164                 __func__, addr, len, val);
 165     if (addr != 0 || len != 4) {
 166         return;
 167     }
 168     s->config_reg = val;
 169 }
 170
 171 static uint64_t pci_host_config_read(void *opaque, hwaddr addr,
 172                                      unsigned len)
 173 {
 174     PCIHostState *s = opaque;
 175     uint32_t val = s->config_reg;
 176
 177     PCI_DPRINTF("%s addr " HWADDR_FMT_plx " len %d val %"PRIx32"\n",
 178                 __func__, addr, len, val);
 179     return val;
 180 }
 181
 182 static void pci_host_data_write(void *opaque, hwaddr addr,
 183                                 uint64_t val, unsigned len)
 184 {
 185     PCIHostState *s = opaque;
 186
 187     if (s->config_reg & (1u << 31))
 188         pci_data_write(s->bus, s->config_reg | (addr & 3), val, len);
 189 }
 190
 191 static uint64_t pci_host_data_read(void *opaque,
 192                                    hwaddr addr, unsigned len)
 193 {
 194     PCIHostState *s = opaque;
 195
 196     if (!(s->config_reg & (1U << 31))) {
 197         return 0xffffffff;
 198     }
 199     return pci_data_read(s->bus, s->config_reg | (addr & 3), len);
 200 }
 201
 202 const MemoryRegionOps pci_host_conf_le_ops = {
 203     .read = pci_host_config_read,
 204     .write = pci_host_config_write,
 205     .endianness = DEVICE_LITTLE_ENDIAN,
 206 };
 207
 208 const MemoryRegionOps pci_host_conf_be_ops = {
 209     .read = pci_host_config_read,
 210     .write = pci_host_config_write,
 211     .endianness = DEVICE_BIG_ENDIAN,
 212 };
 213
 214 const MemoryRegionOps pci_host_data_le_ops = {
 215     .read = pci_host_data_read,
 216     .write = pci_host_data_write,
 217     .endianness = DEVICE_LITTLE_ENDIAN,
 218 };
 219
 220 const MemoryRegionOps pci_host_data_be_ops = {
 221     .read = pci_host_data_read,
 222     .write = pci_host_data_write,
 223     .endianness = DEVICE_BIG_ENDIAN,
 224 };
 225
 226 static bool pci_host_needed(void *opaque)
 227 {
 228     PCIHostState *s = opaque;
 229     return s->mig_enabled;
 230 }
 231
 232 const VMStateDescription vmstate_pcihost = {
 233     .name = "PCIHost",
 234     .needed = pci_host_needed,
 235     .version_id = 1,
 236     .minimum_version_id = 1,
 237     .fields = (const VMStateField[]) {
 238         VMSTATE_UINT32(config_reg, PCIHostState),
 239         VMSTATE_END_OF_LIST()
 240     }
 241 };
 242
 243 static Property pci_host_properties_common[] = {
 244     DEFINE_PROP_BOOL("x-config-reg-migration-enabled", PCIHostState,
 245                      mig_enabled, true),
 246     DEFINE_PROP_BOOL(PCI_HOST_BYPASS_IOMMU, PCIHostState, bypass_iommu, false),
 247     DEFINE_PROP_END_OF_LIST(),
 248 };
 249
 250 static void pci_host_class_init(ObjectClass *klass, void *data)
 251 {
 252     DeviceClass *dc = DEVICE_CLASS(klass);
 253     device_class_set_props(dc, pci_host_properties_common);
 254     dc->vmsd = &vmstate_pcihost;
 255 }
 256
 257 static const TypeInfo pci_host_type_info = {
 258     .name = TYPE_PCI_HOST_BRIDGE,
 259     .parent = TYPE_SYS_BUS_DEVICE,
 260     .abstract = true,
 261     .class_size = sizeof(PCIHostBridgeClass),
 262     .instance_size = sizeof(PCIHostState),
 263     .class_init = pci_host_class_init,
 264 };
 265
 266 static void pci_host_register_types(void)
 267 {
 268     type_register_static(&pci_host_type_info);
 269 }
 270
 271 type_init(pci_host_register_types)