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 void pci_host_config_write_common(PCIDevice *pci_dev, uint32_t addr,
  66                                   uint32_t limit, uint32_t val, uint32_t len)
  67 {
  68     pci_adjust_config_limit(pci_get_bus(pci_dev), &limit);
  69     if (limit <= addr) {
  70         return;
  71     }
  72
  73     assert(len <= 4);
  74     /* non-zero functions are only exposed when function 0 is present,
  75      * allowing direct removal of unexposed functions.
  76      */
  77     if ((pci_dev->qdev.hotplugged && !pci_get_function_0(pci_dev)) ||
  78         !pci_dev->has_power) {
  79         return;
  80     }
  81
  82     trace_pci_cfg_write(pci_dev->name, pci_dev_bus_num(pci_dev),
  83                         PCI_SLOT(pci_dev->devfn),
  84                         PCI_FUNC(pci_dev->devfn), addr, val);
  85     pci_dev->config_write(pci_dev, addr, val, MIN(len, limit - addr));
  86 }
  87
  88 uint32_t pci_host_config_read_common(PCIDevice *pci_dev, uint32_t addr,
  89                                      uint32_t limit, uint32_t len)
  90 {
  91     uint32_t ret;
  92
  93     pci_adjust_config_limit(pci_get_bus(pci_dev), &limit);
  94     if (limit <= addr) {
  95         return ~0x0;
  96     }
  97
  98     assert(len <= 4);
  99     /* non-zero functions are only exposed when function 0 is present,
 100      * allowing direct removal of unexposed functions.
 101      */
 102     if ((pci_dev->qdev.hotplugged && !pci_get_function_0(pci_dev)) ||
 103         !pci_dev->has_power) {
 104         return ~0x0;
 105     }
 106
 107     ret = pci_dev->config_read(pci_dev, addr, MIN(len, limit - addr));
 108     trace_pci_cfg_read(pci_dev->name, pci_dev_bus_num(pci_dev),
 109                        PCI_SLOT(pci_dev->devfn),
 110                        PCI_FUNC(pci_dev->devfn), addr, ret);
 111
 112     return ret;
 113 }
 114
 115 void pci_data_write(PCIBus *s, uint32_t addr, uint32_t val, unsigned len)
 116 {
 117     PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
 118     uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);
 119
 120     if (!pci_dev) {
 121         return;
 122     }
 123
 124     pci_host_config_write_common(pci_dev, config_addr, PCI_CONFIG_SPACE_SIZE,
 125                                  val, len);
 126 }
 127
 128 uint32_t pci_data_read(PCIBus *s, uint32_t addr, unsigned len)
 129 {
 130     PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
 131     uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);
 132
 133     if (!pci_dev) {
 134         return ~0x0;
 135     }
 136
 137     return pci_host_config_read_common(pci_dev, config_addr,
 138                                        PCI_CONFIG_SPACE_SIZE, len);
 139 }
 140
 141 static void pci_host_config_write(void *opaque, hwaddr addr,
 142                                   uint64_t val, unsigned len)
 143 {
 144     PCIHostState *s = opaque;
 145
 146     PCI_DPRINTF("%s addr " TARGET_FMT_plx " len %d val %"PRIx64"\n",
 147                 __func__, addr, len, val);
 148     if (addr != 0 || len != 4) {
 149         return;
 150     }
 151     s->config_reg = val;
 152 }
 153
 154 static uint64_t pci_host_config_read(void *opaque, hwaddr addr,
 155                                      unsigned len)
 156 {
 157     PCIHostState *s = opaque;
 158     uint32_t val = s->config_reg;
 159
 160     PCI_DPRINTF("%s addr " TARGET_FMT_plx " len %d val %"PRIx32"\n",
 161                 __func__, addr, len, val);
 162     return val;
 163 }
 164
 165 static void pci_host_data_write(void *opaque, hwaddr addr,
 166                                 uint64_t val, unsigned len)
 167 {
 168     PCIHostState *s = opaque;
 169
 170     if (s->config_reg & (1u << 31))
 171         pci_data_write(s->bus, s->config_reg | (addr & 3), val, len);
 172 }
 173
 174 static uint64_t pci_host_data_read(void *opaque,
 175                                    hwaddr addr, unsigned len)
 176 {
 177     PCIHostState *s = opaque;
 178
 179     if (!(s->config_reg & (1U << 31))) {
 180         return 0xffffffff;
 181     }
 182     return pci_data_read(s->bus, s->config_reg | (addr & 3), len);
 183 }
 184
 185 const MemoryRegionOps pci_host_conf_le_ops = {
 186     .read = pci_host_config_read,
 187     .write = pci_host_config_write,
 188     .endianness = DEVICE_LITTLE_ENDIAN,
 189 };
 190
 191 const MemoryRegionOps pci_host_conf_be_ops = {
 192     .read = pci_host_config_read,
 193     .write = pci_host_config_write,
 194     .endianness = DEVICE_BIG_ENDIAN,
 195 };
 196
 197 const MemoryRegionOps pci_host_data_le_ops = {
 198     .read = pci_host_data_read,
 199     .write = pci_host_data_write,
 200     .endianness = DEVICE_LITTLE_ENDIAN,
 201 };
 202
 203 const MemoryRegionOps pci_host_data_be_ops = {
 204     .read = pci_host_data_read,
 205     .write = pci_host_data_write,
 206     .endianness = DEVICE_BIG_ENDIAN,
 207 };
 208
 209 static bool pci_host_needed(void *opaque)
 210 {
 211     PCIHostState *s = opaque;
 212     return s->mig_enabled;
 213 }
 214
 215 const VMStateDescription vmstate_pcihost = {
 216     .name = "PCIHost",
 217     .needed = pci_host_needed,
 218     .version_id = 1,
 219     .minimum_version_id = 1,
 220     .fields = (VMStateField[]) {
 221         VMSTATE_UINT32(config_reg, PCIHostState),
 222         VMSTATE_END_OF_LIST()
 223     }
 224 };
 225
 226 static Property pci_host_properties_common[] = {
 227     DEFINE_PROP_BOOL("x-config-reg-migration-enabled", PCIHostState,
 228                      mig_enabled, true),
 229     DEFINE_PROP_BOOL("bypass-iommu", PCIHostState, bypass_iommu, false),
 230     DEFINE_PROP_END_OF_LIST(),
 231 };
 232
 233 static void pci_host_class_init(ObjectClass *klass, void *data)
 234 {
 235     DeviceClass *dc = DEVICE_CLASS(klass);
 236     device_class_set_props(dc, pci_host_properties_common);
 237     dc->vmsd = &vmstate_pcihost;
 238 }
 239
 240 static const TypeInfo pci_host_type_info = {
 241     .name = TYPE_PCI_HOST_BRIDGE,
 242     .parent = TYPE_SYS_BUS_DEVICE,
 243     .abstract = true,
 244     .class_size = sizeof(PCIHostBridgeClass),
 245     .instance_size = sizeof(PCIHostState),
 246     .class_init = pci_host_class_init,
 247 };
 248
 249 static void pci_host_register_types(void)
 250 {
 251     type_register_static(&pci_host_type_info);
 252 }
 253
 254 type_init(pci_host_register_types)