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/hw.h" 24 #include "hw/pci/pci.h" 25 #include "hw/pci/pcie_host.h" 26 #include "exec/address-spaces.h" 27 28 /* a helper function to get a PCIDevice for a given mmconfig address */ 29 static inline PCIDevice *pcie_dev_find_by_mmcfg_addr(PCIBus *s, 30 uint32_t mmcfg_addr) 31 { 32 return pci_find_device(s, PCIE_MMCFG_BUS(mmcfg_addr), 33 PCIE_MMCFG_DEVFN(mmcfg_addr)); 34 } 35 36 static void pcie_mmcfg_data_write(void *opaque, hwaddr mmcfg_addr, 37 uint64_t val, unsigned len) 38 { 39 PCIExpressHost *e = opaque; 40 PCIBus *s = e->pci.bus; 41 PCIDevice *pci_dev = pcie_dev_find_by_mmcfg_addr(s, mmcfg_addr); 42 uint32_t addr; 43 uint32_t limit; 44 45 if (!pci_dev) { 46 return; 47 } 48 addr = PCIE_MMCFG_CONFOFFSET(mmcfg_addr); 49 limit = pci_config_size(pci_dev); 50 if (limit <= addr) { 51 /* conventional pci device can be behind pcie-to-pci bridge. 52 256 <= addr < 4K has no effects. */ 53 return; 54 } 55 pci_host_config_write_common(pci_dev, addr, limit, val, len); 56 } 57 58 static uint64_t pcie_mmcfg_data_read(void *opaque, 59 hwaddr mmcfg_addr, 60 unsigned len) 61 { 62 PCIExpressHost *e = opaque; 63 PCIBus *s = e->pci.bus; 64 PCIDevice *pci_dev = pcie_dev_find_by_mmcfg_addr(s, mmcfg_addr); 65 uint32_t addr; 66 uint32_t limit; 67 68 if (!pci_dev) { 69 return ~0x0; 70 } 71 addr = PCIE_MMCFG_CONFOFFSET(mmcfg_addr); 72 limit = pci_config_size(pci_dev); 73 if (limit <= addr) { 74 /* conventional pci device can be behind pcie-to-pci bridge. 75 256 <= addr < 4K has no effects. */ 76 return ~0x0; 77 } 78 return pci_host_config_read_common(pci_dev, addr, limit, len); 79 } 80 81 static const MemoryRegionOps pcie_mmcfg_ops = { 82 .read = pcie_mmcfg_data_read, 83 .write = pcie_mmcfg_data_write, 84 .endianness = DEVICE_LITTLE_ENDIAN, 85 }; 86 87 static void pcie_host_init(Object *obj) 88 { 89 PCIExpressHost *e = PCIE_HOST_BRIDGE(obj); 90 91 e->base_addr = PCIE_BASE_ADDR_UNMAPPED; 92 memory_region_init_io(&e->mmio, OBJECT(e), &pcie_mmcfg_ops, e, "pcie-mmcfg-mmio", 93 PCIE_MMCFG_SIZE_MAX); 94 } 95 96 void pcie_host_mmcfg_unmap(PCIExpressHost *e) 97 { 98 if (e->base_addr != PCIE_BASE_ADDR_UNMAPPED) { 99 memory_region_del_subregion(get_system_memory(), &e->mmio); 100 e->base_addr = PCIE_BASE_ADDR_UNMAPPED; 101 } 102 } 103 104 void pcie_host_mmcfg_init(PCIExpressHost *e, uint32_t size) 105 { 106 assert(!(size & (size - 1))); /* power of 2 */ 107 assert(size >= PCIE_MMCFG_SIZE_MIN); 108 assert(size <= PCIE_MMCFG_SIZE_MAX); 109 e->size = size; 110 memory_region_set_size(&e->mmio, e->size); 111 } 112 113 void pcie_host_mmcfg_map(PCIExpressHost *e, hwaddr addr, 114 uint32_t size) 115 { 116 pcie_host_mmcfg_init(e, size); 117 e->base_addr = addr; 118 memory_region_add_subregion(get_system_memory(), e->base_addr, &e->mmio); 119 } 120 121 void pcie_host_mmcfg_update(PCIExpressHost *e, 122 int enable, 123 hwaddr addr, 124 uint32_t size) 125 { 126 memory_region_transaction_begin(); 127 pcie_host_mmcfg_unmap(e); 128 if (enable) { 129 pcie_host_mmcfg_map(e, addr, size); 130 } 131 memory_region_transaction_commit(); 132 } 133 134 static const TypeInfo pcie_host_type_info = { 135 .name = TYPE_PCIE_HOST_BRIDGE, 136 .parent = TYPE_PCI_HOST_BRIDGE, 137 .abstract = true, 138 .instance_size = sizeof(PCIExpressHost), 139 .instance_init = pcie_host_init, 140 }; 141 142 static void pcie_host_register_types(void) 143 { 144 type_register_static(&pcie_host_type_info); 145 } 146 147 type_init(pcie_host_register_types) 148