diff options
Diffstat (limited to 'hw/pci/pcie_host.c')
| -rw-r--r-- | hw/pci/pcie_host.c | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/hw/pci/pcie_host.c b/hw/pci/pcie_host.c new file mode 100644 index 0000000000..b2d942bce1 --- /dev/null +++ b/hw/pci/pcie_host.c @@ -0,0 +1,161 @@ +/* + * pcie_host.c + * utility functions for pci express host bridge. + * + * Copyright (c) 2009 Isaku Yamahata <yamahata at valinux co jp> + * VA Linux Systems Japan K.K. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + + * You should have received a copy of the GNU General Public License along + * with this program; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "hw/hw.h" +#include "hw/pci/pci.h" +#include "hw/pci/pcie_host.h" +#include "exec/address-spaces.h" + +/* + * PCI express mmcfig address + * bit 20 - 28: bus number + * bit 15 - 19: device number + * bit 12 - 14: function number + * bit 0 - 11: offset in configuration space of a given device + */ +#define PCIE_MMCFG_SIZE_MAX (1ULL << 28) +#define PCIE_MMCFG_SIZE_MIN (1ULL << 20) +#define PCIE_MMCFG_BUS_BIT 20 +#define PCIE_MMCFG_BUS_MASK 0x1ff +#define PCIE_MMCFG_DEVFN_BIT 12 +#define PCIE_MMCFG_DEVFN_MASK 0xff +#define PCIE_MMCFG_CONFOFFSET_MASK 0xfff +#define PCIE_MMCFG_BUS(addr) (((addr) >> PCIE_MMCFG_BUS_BIT) & \ + PCIE_MMCFG_BUS_MASK) +#define PCIE_MMCFG_DEVFN(addr) (((addr) >> PCIE_MMCFG_DEVFN_BIT) & \ + PCIE_MMCFG_DEVFN_MASK) +#define PCIE_MMCFG_CONFOFFSET(addr) ((addr) & PCIE_MMCFG_CONFOFFSET_MASK) + + +/* a helper function to get a PCIDevice for a given mmconfig address */ +static inline PCIDevice *pcie_dev_find_by_mmcfg_addr(PCIBus *s, + uint32_t mmcfg_addr) +{ + return pci_find_device(s, PCIE_MMCFG_BUS(mmcfg_addr), + PCIE_MMCFG_DEVFN(mmcfg_addr)); +} + +static void pcie_mmcfg_data_write(void *opaque, hwaddr mmcfg_addr, + uint64_t val, unsigned len) +{ + PCIExpressHost *e = opaque; + PCIBus *s = e->pci.bus; + PCIDevice *pci_dev = pcie_dev_find_by_mmcfg_addr(s, mmcfg_addr); + uint32_t addr; + uint32_t limit; + + if (!pci_dev) { + return; + } + addr = PCIE_MMCFG_CONFOFFSET(mmcfg_addr); + limit = pci_config_size(pci_dev); + if (limit <= addr) { + /* conventional pci device can be behind pcie-to-pci bridge. + 256 <= addr < 4K has no effects. */ + return; + } + pci_host_config_write_common(pci_dev, addr, limit, val, len); +} + +static uint64_t pcie_mmcfg_data_read(void *opaque, + hwaddr mmcfg_addr, + unsigned len) +{ + PCIExpressHost *e = opaque; + PCIBus *s = e->pci.bus; + PCIDevice *pci_dev = pcie_dev_find_by_mmcfg_addr(s, mmcfg_addr); + uint32_t addr; + uint32_t limit; + + if (!pci_dev) { + return ~0x0; + } + addr = PCIE_MMCFG_CONFOFFSET(mmcfg_addr); + limit = pci_config_size(pci_dev); + if (limit <= addr) { + /* conventional pci device can be behind pcie-to-pci bridge. + 256 <= addr < 4K has no effects. */ + return ~0x0; + } + return pci_host_config_read_common(pci_dev, addr, limit, len); +} + +static const MemoryRegionOps pcie_mmcfg_ops = { + .read = pcie_mmcfg_data_read, + .write = pcie_mmcfg_data_write, + .endianness = DEVICE_NATIVE_ENDIAN, +}; + +/* pcie_host::base_addr == PCIE_BASE_ADDR_UNMAPPED when it isn't mapped. */ +#define PCIE_BASE_ADDR_UNMAPPED ((hwaddr)-1ULL) + +int pcie_host_init(PCIExpressHost *e) +{ + e->base_addr = PCIE_BASE_ADDR_UNMAPPED; + + return 0; +} + +void pcie_host_mmcfg_unmap(PCIExpressHost *e) +{ + if (e->base_addr != PCIE_BASE_ADDR_UNMAPPED) { + memory_region_del_subregion(get_system_memory(), &e->mmio); + memory_region_destroy(&e->mmio); + e->base_addr = PCIE_BASE_ADDR_UNMAPPED; + } +} + +void pcie_host_mmcfg_map(PCIExpressHost *e, hwaddr addr, + uint32_t size) +{ + assert(!(size & (size - 1))); /* power of 2 */ + assert(size >= PCIE_MMCFG_SIZE_MIN); + assert(size <= PCIE_MMCFG_SIZE_MAX); + e->size = size; + memory_region_init_io(&e->mmio, &pcie_mmcfg_ops, e, "pcie-mmcfg", e->size); + e->base_addr = addr; + memory_region_add_subregion(get_system_memory(), e->base_addr, &e->mmio); +} + +void pcie_host_mmcfg_update(PCIExpressHost *e, + int enable, + hwaddr addr, + uint32_t size) +{ + pcie_host_mmcfg_unmap(e); + if (enable) { + pcie_host_mmcfg_map(e, addr, size); + } +} + +static const TypeInfo pcie_host_type_info = { + .name = TYPE_PCIE_HOST_BRIDGE, + .parent = TYPE_PCI_HOST_BRIDGE, + .abstract = true, + .instance_size = sizeof(PCIExpressHost), +}; + +static void pcie_host_register_types(void) +{ + type_register_static(&pcie_host_type_info); +} + +type_init(pcie_host_register_types) |