hw/pci/pcie_host.c

   1 /*
   2  * pcie_host.c
   3  * utility functions for pci express host bridge.
   4  *
   5  * Copyright (c) 2009 Isaku Yamahata <yamahata at valinux co jp>
   6  *                    VA Linux Systems Japan K.K.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "qemu/osdep.h"
  23 #include "hw/pci/pci.h"
  24 #include "hw/pci/pcie_host.h"
  25 #include "qemu/module.h"
  26
  27 /* a helper function to get a PCIDevice for a given mmconfig address */
  28 static inline PCIDevice *pcie_dev_find_by_mmcfg_addr(PCIBus *s,
  29                                                      uint32_t mmcfg_addr)
  30 {
  31     return pci_find_device(s, PCIE_MMCFG_BUS(mmcfg_addr),
  32                            PCIE_MMCFG_DEVFN(mmcfg_addr));
  33 }
  34
  35 static void pcie_mmcfg_data_write(void *opaque, hwaddr mmcfg_addr,
  36                                   uint64_t val, unsigned len)
  37 {
  38     PCIExpressHost *e = opaque;
  39     PCIBus *s = e->pci.bus;
  40     PCIDevice *pci_dev = pcie_dev_find_by_mmcfg_addr(s, mmcfg_addr);
  41     uint32_t addr;
  42     uint32_t limit;
  43
  44     if (!pci_dev) {
  45         return;
  46     }
  47     addr = PCIE_MMCFG_CONFOFFSET(mmcfg_addr);
  48     limit = pci_config_size(pci_dev);
  49     pci_host_config_write_common(pci_dev, addr, limit, val, len);
  50 }
  51
  52 static uint64_t pcie_mmcfg_data_read(void *opaque,
  53                                      hwaddr mmcfg_addr,
  54                                      unsigned len)
  55 {
  56     PCIExpressHost *e = opaque;
  57     PCIBus *s = e->pci.bus;
  58     PCIDevice *pci_dev = pcie_dev_find_by_mmcfg_addr(s, mmcfg_addr);
  59     uint32_t addr;
  60     uint32_t limit;
  61
  62     if (!pci_dev) {
  63         return ~0x0;
  64     }
  65     addr = PCIE_MMCFG_CONFOFFSET(mmcfg_addr);
  66     limit = pci_config_size(pci_dev);
  67     return pci_host_config_read_common(pci_dev, addr, limit, len);
  68 }
  69
  70 static const MemoryRegionOps pcie_mmcfg_ops = {
  71     .read = pcie_mmcfg_data_read,
  72     .write = pcie_mmcfg_data_write,
  73     .endianness = DEVICE_LITTLE_ENDIAN,
  74 };
  75
  76 static void pcie_host_init(Object *obj)
  77 {
  78     PCIExpressHost *e = PCIE_HOST_BRIDGE(obj);
  79
  80     e->base_addr = PCIE_BASE_ADDR_UNMAPPED;
  81     memory_region_init_io(&e->mmio, OBJECT(e), &pcie_mmcfg_ops, e, "pcie-mmcfg-mmio",
  82                           PCIE_MMCFG_SIZE_MAX);
  83 }
  84
  85 void pcie_host_mmcfg_unmap(PCIExpressHost *e)
  86 {
  87     if (e->base_addr != PCIE_BASE_ADDR_UNMAPPED) {
  88         memory_region_del_subregion(get_system_memory(), &e->mmio);
  89         e->base_addr = PCIE_BASE_ADDR_UNMAPPED;
  90     }
  91 }
  92
  93 void pcie_host_mmcfg_init(PCIExpressHost *e, uint32_t size)
  94 {
  95     assert(!(size & (size - 1)));       /* power of 2 */
  96     assert(size >= PCIE_MMCFG_SIZE_MIN);
  97     assert(size <= PCIE_MMCFG_SIZE_MAX);
  98     e->size = size;
  99     memory_region_set_size(&e->mmio, e->size);
 100 }
 101
 102 void pcie_host_mmcfg_map(PCIExpressHost *e, hwaddr addr,
 103                          uint32_t size)
 104 {
 105     pcie_host_mmcfg_init(e, size);
 106     e->base_addr = addr;
 107     memory_region_add_subregion(get_system_memory(), e->base_addr, &e->mmio);
 108 }
 109
 110 void pcie_host_mmcfg_update(PCIExpressHost *e,
 111                             int enable,
 112                             hwaddr addr,
 113                             uint32_t size)
 114 {
 115     memory_region_transaction_begin();
 116     pcie_host_mmcfg_unmap(e);
 117     if (enable) {
 118         pcie_host_mmcfg_map(e, addr, size);
 119     }
 120     memory_region_transaction_commit();
 121 }
 122
 123 static const TypeInfo pcie_host_type_info = {
 124     .name = TYPE_PCIE_HOST_BRIDGE,
 125     .parent = TYPE_PCI_HOST_BRIDGE,
 126     .abstract = true,
 127     .instance_size = sizeof(PCIExpressHost),
 128     .instance_init = pcie_host_init,
 129 };
 130
 131 static void pcie_host_register_types(void)
 132 {
 133     type_register_static(&pcie_host_type_info);
 134 }
 135
 136 type_init(pcie_host_register_types)