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/pci/pci_bus.h"
  26 #include "trace.h"
  27
  28 /* debug PCI */
  29 //#define DEBUG_PCI
  30
  31 #ifdef DEBUG_PCI
  32 #define PCI_DPRINTF(fmt, ...) \
  33 do { printf("pci_host_data: " fmt , ## __VA_ARGS__); } while (0)
  34 #else
  35 #define PCI_DPRINTF(fmt, ...)
  36 #endif
  37
  38 /*
  39  * PCI address
  40  * bit 16 - 24: bus number
  41  * bit  8 - 15: devfun number
  42  * bit  0 -  7: offset in configuration space of a given pci device
  43  */
  44
  45 /* the helper function to get a PCIDevice* for a given pci address */
  46 static inline PCIDevice *pci_dev_find_by_addr(PCIBus *bus, uint32_t addr)
  47 {
  48     uint8_t bus_num = addr >> 16;
  49     uint8_t devfn = addr >> 8;
  50
  51     return pci_find_device(bus, bus_num, devfn);
  52 }
  53
  54 static void pci_adjust_config_limit(PCIBus *bus, uint32_t *limit)
  55 {
  56     if (*limit > PCI_CONFIG_SPACE_SIZE) {
  57         if (!pci_bus_is_express(bus)) {
  58             *limit = PCI_CONFIG_SPACE_SIZE;
  59             return;
  60         }
  61
  62         if (!pci_bus_is_root(bus)) {
  63             PCIDevice *bridge = pci_bridge_get_device(bus);
  64             pci_adjust_config_limit(pci_get_bus(bridge), limit);
  65         }
  66     }
  67 }
  68
  69 void pci_host_config_write_common(PCIDevice *pci_dev, uint32_t addr,
  70                                   uint32_t limit, uint32_t val, uint32_t len)
  71 {
  72     pci_adjust_config_limit(pci_get_bus(pci_dev), &limit);
  73     if (limit <= addr) {
  74         return;
  75     }
  76
  77     assert(len <= 4);
  78     /* non-zero functions are only exposed when function 0 is present,
  79      * allowing direct removal of unexposed functions.
  80      */
  81     if (pci_dev->qdev.hotplugged && !pci_get_function_0(pci_dev)) {
  82         return;
  83     }
  84
  85     trace_pci_cfg_write(pci_dev->name, PCI_SLOT(pci_dev->devfn),
  86                         PCI_FUNC(pci_dev->devfn), addr, val);
  87     pci_dev->config_write(pci_dev, addr, val, MIN(len, limit - addr));
  88 }
  89
  90 uint32_t pci_host_config_read_common(PCIDevice *pci_dev, uint32_t addr,
  91                                      uint32_t limit, uint32_t len)
  92 {
  93     uint32_t ret;
  94
  95     pci_adjust_config_limit(pci_get_bus(pci_dev), &limit);
  96     if (limit <= addr) {
  97         return ~0x0;
  98     }
  99
 100     assert(len <= 4);
 101     /* non-zero functions are only exposed when function 0 is present,
 102      * allowing direct removal of unexposed functions.
 103      */
 104     if (pci_dev->qdev.hotplugged && !pci_get_function_0(pci_dev)) {
 105         return ~0x0;
 106     }
 107
 108     ret = pci_dev->config_read(pci_dev, addr, MIN(len, limit - addr));
 109     trace_pci_cfg_read(pci_dev->name, 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, int 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_DPRINTF("%s: %s: addr=%02" PRIx32 " val=%08" PRIx32 " len=%d\n",
 125                 __func__, pci_dev->name, config_addr, val, len);
 126     pci_host_config_write_common(pci_dev, config_addr, PCI_CONFIG_SPACE_SIZE,
 127                                  val, len);
 128 }
 129
 130 uint32_t pci_data_read(PCIBus *s, uint32_t addr, int len)
 131 {
 132     PCIDevice *pci_dev = pci_dev_find_by_addr(s, addr);
 133     uint32_t config_addr = addr & (PCI_CONFIG_SPACE_SIZE - 1);
 134     uint32_t val;
 135
 136     if (!pci_dev) {
 137         return ~0x0;
 138     }
 139
 140     val = pci_host_config_read_common(pci_dev, config_addr,
 141                                       PCI_CONFIG_SPACE_SIZE, len);
 142     PCI_DPRINTF("%s: %s: addr=%02"PRIx32" val=%08"PRIx32" len=%d\n",
 143                 __func__, pci_dev->name, config_addr, val, len);
 144
 145     return val;
 146 }
 147
 148 static void pci_host_config_write(void *opaque, hwaddr addr,
 149                                   uint64_t val, unsigned len)
 150 {
 151     PCIHostState *s = opaque;
 152
 153     PCI_DPRINTF("%s addr " TARGET_FMT_plx " len %d val %"PRIx64"\n",
 154                 __func__, addr, len, val);
 155     if (addr != 0 || len != 4) {
 156         return;
 157     }
 158     s->config_reg = val;
 159 }
 160
 161 static uint64_t pci_host_config_read(void *opaque, hwaddr addr,
 162                                      unsigned len)
 163 {
 164     PCIHostState *s = opaque;
 165     uint32_t val = s->config_reg;
 166
 167     PCI_DPRINTF("%s addr " TARGET_FMT_plx " len %d val %"PRIx32"\n",
 168                 __func__, addr, len, val);
 169     return val;
 170 }
 171
 172 static void pci_host_data_write(void *opaque, hwaddr addr,
 173                                 uint64_t val, unsigned len)
 174 {
 175     PCIHostState *s = opaque;
 176     PCI_DPRINTF("write addr " TARGET_FMT_plx " len %d val %x\n",
 177                 addr, len, (unsigned)val);
 178     if (s->config_reg & (1u << 31))
 179         pci_data_write(s->bus, s->config_reg | (addr & 3), val, len);
 180 }
 181
 182 static uint64_t pci_host_data_read(void *opaque,
 183                                    hwaddr addr, unsigned len)
 184 {
 185     PCIHostState *s = opaque;
 186     uint32_t val;
 187     if (!(s->config_reg & (1U << 31))) {
 188         return 0xffffffff;
 189     }
 190     val = pci_data_read(s->bus, s->config_reg | (addr & 3), len);
 191     PCI_DPRINTF("read addr " TARGET_FMT_plx " len %d val %x\n",
 192                 addr, len, val);
 193     return val;
 194 }
 195
 196 const MemoryRegionOps pci_host_conf_le_ops = {
 197     .read = pci_host_config_read,
 198     .write = pci_host_config_write,
 199     .endianness = DEVICE_LITTLE_ENDIAN,
 200 };
 201
 202 const MemoryRegionOps pci_host_conf_be_ops = {
 203     .read = pci_host_config_read,
 204     .write = pci_host_config_write,
 205     .endianness = DEVICE_BIG_ENDIAN,
 206 };
 207
 208 const MemoryRegionOps pci_host_data_le_ops = {
 209     .read = pci_host_data_read,
 210     .write = pci_host_data_write,
 211     .endianness = DEVICE_LITTLE_ENDIAN,
 212 };
 213
 214 const MemoryRegionOps pci_host_data_be_ops = {
 215     .read = pci_host_data_read,
 216     .write = pci_host_data_write,
 217     .endianness = DEVICE_BIG_ENDIAN,
 218 };
 219
 220 static const TypeInfo pci_host_type_info = {
 221     .name = TYPE_PCI_HOST_BRIDGE,
 222     .parent = TYPE_SYS_BUS_DEVICE,
 223     .abstract = true,
 224     .class_size = sizeof(PCIHostBridgeClass),
 225     .instance_size = sizeof(PCIHostState),
 226 };
 227
 228 static void pci_host_register_types(void)
 229 {
 230     type_register_static(&pci_host_type_info);
 231 }
 232
 233 type_init(pci_host_register_types)