From d86d30192b7bc5a10fa6c82c073f55aea25f9291 Mon Sep 17 00:00:00 2001 From: Ben Widawsky Date: Fri, 29 Apr 2022 15:40:41 +0100 Subject: hw/cxl/rp: Add a root port MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This adds just enough of a root port implementation to be able to enumerate root ports (creating the required DVSEC entries). What's not here yet is the MMIO nor the ability to write some of the DVSEC entries. This can be added with the qemu commandline by adding a rootport to a specific CXL host bridge. For example: -device cxl-rp,id=rp0,bus="cxl.0",addr=0.0,chassis=4 Like the host bridge patch, the ACPI tables aren't generated at this point and so system software cannot use it. Signed-off-by: Ben Widawsky Signed-off-by: Jonathan Cameron Reviewed-by: Alex Bennée Message-Id: <20220429144110.25167-17-Jonathan.Cameron@huawei.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/pci-bridge/Kconfig | 5 + hw/pci-bridge/cxl_root_port.c | 236 +++++++++++++++++++++++++++++++++++++++++ hw/pci-bridge/meson.build | 1 + hw/pci-bridge/pcie_root_port.c | 6 +- hw/pci/pci.c | 4 +- 5 files changed, 250 insertions(+), 2 deletions(-) create mode 100644 hw/pci-bridge/cxl_root_port.c (limited to 'hw') diff --git a/hw/pci-bridge/Kconfig b/hw/pci-bridge/Kconfig index f8df431..02614f4 100644 --- a/hw/pci-bridge/Kconfig +++ b/hw/pci-bridge/Kconfig @@ -27,3 +27,8 @@ config DEC_PCI config SIMBA bool + +config CXL + bool + default y if PCI_EXPRESS && PXB + depends on PCI_EXPRESS && MSI_NONBROKEN && PXB diff --git a/hw/pci-bridge/cxl_root_port.c b/hw/pci-bridge/cxl_root_port.c new file mode 100644 index 0000000..fb213fa --- /dev/null +++ b/hw/pci-bridge/cxl_root_port.c @@ -0,0 +1,236 @@ +/* + * CXL 2.0 Root Port Implementation + * + * Copyright(C) 2020 Intel Corporation. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see + */ + +#include "qemu/osdep.h" +#include "qemu/log.h" +#include "qemu/range.h" +#include "hw/pci/pci_bridge.h" +#include "hw/pci/pcie_port.h" +#include "hw/qdev-properties.h" +#include "hw/sysbus.h" +#include "qapi/error.h" +#include "hw/cxl/cxl.h" + +#define CXL_ROOT_PORT_DID 0x7075 + +/* Copied from the gen root port which we derive */ +#define GEN_PCIE_ROOT_PORT_AER_OFFSET 0x100 +#define GEN_PCIE_ROOT_PORT_ACS_OFFSET \ + (GEN_PCIE_ROOT_PORT_AER_OFFSET + PCI_ERR_SIZEOF) +#define CXL_ROOT_PORT_DVSEC_OFFSET \ + (GEN_PCIE_ROOT_PORT_ACS_OFFSET + PCI_ACS_SIZEOF) + +typedef struct CXLRootPort { + /*< private >*/ + PCIESlot parent_obj; + + CXLComponentState cxl_cstate; + PCIResReserve res_reserve; +} CXLRootPort; + +#define TYPE_CXL_ROOT_PORT "cxl-rp" +DECLARE_INSTANCE_CHECKER(CXLRootPort, CXL_ROOT_PORT, TYPE_CXL_ROOT_PORT) + +static void latch_registers(CXLRootPort *crp) +{ + uint32_t *reg_state = crp->cxl_cstate.crb.cache_mem_registers; + uint32_t *write_msk = crp->cxl_cstate.crb.cache_mem_regs_write_mask; + + cxl_component_register_init_common(reg_state, write_msk, CXL2_ROOT_PORT); +} + +static void build_dvsecs(CXLComponentState *cxl) +{ + uint8_t *dvsec; + + dvsec = (uint8_t *)&(CXLDVSECPortExtensions){ 0 }; + cxl_component_create_dvsec(cxl, CXL2_ROOT_PORT, + EXTENSIONS_PORT_DVSEC_LENGTH, + EXTENSIONS_PORT_DVSEC, + EXTENSIONS_PORT_DVSEC_REVID, dvsec); + + dvsec = (uint8_t *)&(CXLDVSECPortGPF){ + .rsvd = 0, + .phase1_ctrl = 1, /* 1μs timeout */ + .phase2_ctrl = 1, /* 1μs timeout */ + }; + cxl_component_create_dvsec(cxl, CXL2_ROOT_PORT, + GPF_PORT_DVSEC_LENGTH, GPF_PORT_DVSEC, + GPF_PORT_DVSEC_REVID, dvsec); + + dvsec = (uint8_t *)&(CXLDVSECPortFlexBus){ + .cap = 0x26, /* IO, Mem, non-MLD */ + .ctrl = 0x2, + .status = 0x26, /* same */ + .rcvd_mod_ts_data_phase1 = 0xef, + }; + cxl_component_create_dvsec(cxl, CXL2_ROOT_PORT, + PCIE_FLEXBUS_PORT_DVSEC_LENGTH_2_0, + PCIE_FLEXBUS_PORT_DVSEC, + PCIE_FLEXBUS_PORT_DVSEC_REVID_2_0, dvsec); + + dvsec = (uint8_t *)&(CXLDVSECRegisterLocator){ + .rsvd = 0, + .reg0_base_lo = RBI_COMPONENT_REG | CXL_COMPONENT_REG_BAR_IDX, + .reg0_base_hi = 0, + }; + cxl_component_create_dvsec(cxl, CXL2_ROOT_PORT, + REG_LOC_DVSEC_LENGTH, REG_LOC_DVSEC, + REG_LOC_DVSEC_REVID, dvsec); +} + +static void cxl_rp_realize(DeviceState *dev, Error **errp) +{ + PCIDevice *pci_dev = PCI_DEVICE(dev); + PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(dev); + CXLRootPort *crp = CXL_ROOT_PORT(dev); + CXLComponentState *cxl_cstate = &crp->cxl_cstate; + ComponentRegisters *cregs = &cxl_cstate->crb; + MemoryRegion *component_bar = &cregs->component_registers; + Error *local_err = NULL; + + rpc->parent_realize(dev, &local_err); + if (local_err) { + error_propagate(errp, local_err); + return; + } + + int rc = + pci_bridge_qemu_reserve_cap_init(pci_dev, 0, crp->res_reserve, errp); + if (rc < 0) { + rpc->parent_class.exit(pci_dev); + return; + } + + if (!crp->res_reserve.io || crp->res_reserve.io == -1) { + pci_word_test_and_clear_mask(pci_dev->wmask + PCI_COMMAND, + PCI_COMMAND_IO); + pci_dev->wmask[PCI_IO_BASE] = 0; + pci_dev->wmask[PCI_IO_LIMIT] = 0; + } + + cxl_cstate->dvsec_offset = CXL_ROOT_PORT_DVSEC_OFFSET; + cxl_cstate->pdev = pci_dev; + build_dvsecs(&crp->cxl_cstate); + + cxl_component_register_block_init(OBJECT(pci_dev), cxl_cstate, + TYPE_CXL_ROOT_PORT); + + pci_register_bar(pci_dev, CXL_COMPONENT_REG_BAR_IDX, + PCI_BASE_ADDRESS_SPACE_MEMORY | + PCI_BASE_ADDRESS_MEM_TYPE_64, + component_bar); +} + +static void cxl_rp_reset(DeviceState *dev) +{ + PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(dev); + CXLRootPort *crp = CXL_ROOT_PORT(dev); + + rpc->parent_reset(dev); + + latch_registers(crp); +} + +static Property gen_rp_props[] = { + DEFINE_PROP_UINT32("bus-reserve", CXLRootPort, res_reserve.bus, -1), + DEFINE_PROP_SIZE("io-reserve", CXLRootPort, res_reserve.io, -1), + DEFINE_PROP_SIZE("mem-reserve", CXLRootPort, res_reserve.mem_non_pref, -1), + DEFINE_PROP_SIZE("pref32-reserve", CXLRootPort, res_reserve.mem_pref_32, + -1), + DEFINE_PROP_SIZE("pref64-reserve", CXLRootPort, res_reserve.mem_pref_64, + -1), + DEFINE_PROP_END_OF_LIST() +}; + +static void cxl_rp_dvsec_write_config(PCIDevice *dev, uint32_t addr, + uint32_t val, int len) +{ + CXLRootPort *crp = CXL_ROOT_PORT(dev); + + if (range_contains(&crp->cxl_cstate.dvsecs[EXTENSIONS_PORT_DVSEC], addr)) { + uint8_t *reg = &dev->config[addr]; + addr -= crp->cxl_cstate.dvsecs[EXTENSIONS_PORT_DVSEC].lob; + if (addr == PORT_CONTROL_OFFSET) { + if (pci_get_word(reg) & PORT_CONTROL_UNMASK_SBR) { + /* unmask SBR */ + qemu_log_mask(LOG_UNIMP, "SBR mask control is not supported\n"); + } + if (pci_get_word(reg) & PORT_CONTROL_ALT_MEMID_EN) { + /* Alt Memory & ID Space Enable */ + qemu_log_mask(LOG_UNIMP, + "Alt Memory & ID space is not supported\n"); + } + } + } +} + +static void cxl_rp_write_config(PCIDevice *d, uint32_t address, uint32_t val, + int len) +{ + uint16_t slt_ctl, slt_sta; + + pcie_cap_slot_get(d, &slt_ctl, &slt_sta); + pci_bridge_write_config(d, address, val, len); + pcie_cap_flr_write_config(d, address, val, len); + pcie_cap_slot_write_config(d, slt_ctl, slt_sta, address, val, len); + pcie_aer_write_config(d, address, val, len); + + cxl_rp_dvsec_write_config(d, address, val, len); +} + +static void cxl_root_port_class_init(ObjectClass *oc, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(oc); + PCIDeviceClass *k = PCI_DEVICE_CLASS(oc); + PCIERootPortClass *rpc = PCIE_ROOT_PORT_CLASS(oc); + + k->vendor_id = PCI_VENDOR_ID_INTEL; + k->device_id = CXL_ROOT_PORT_DID; + dc->desc = "CXL Root Port"; + k->revision = 0; + device_class_set_props(dc, gen_rp_props); + k->config_write = cxl_rp_write_config; + + device_class_set_parent_realize(dc, cxl_rp_realize, &rpc->parent_realize); + device_class_set_parent_reset(dc, cxl_rp_reset, &rpc->parent_reset); + + rpc->aer_offset = GEN_PCIE_ROOT_PORT_AER_OFFSET; + rpc->acs_offset = GEN_PCIE_ROOT_PORT_ACS_OFFSET; + + dc->hotpluggable = false; +} + +static const TypeInfo cxl_root_port_info = { + .name = TYPE_CXL_ROOT_PORT, + .parent = TYPE_PCIE_ROOT_PORT, + .instance_size = sizeof(CXLRootPort), + .class_init = cxl_root_port_class_init, + .interfaces = (InterfaceInfo[]) { + { INTERFACE_CXL_DEVICE }, + { } + }, +}; + +static void cxl_register(void) +{ + type_register_static(&cxl_root_port_info); +} + +type_init(cxl_register); diff --git a/hw/pci-bridge/meson.build b/hw/pci-bridge/meson.build index daab8ac..b6d26a0 100644 --- a/hw/pci-bridge/meson.build +++ b/hw/pci-bridge/meson.build @@ -5,6 +5,7 @@ pci_ss.add(when: 'CONFIG_IOH3420', if_true: files('ioh3420.c')) pci_ss.add(when: 'CONFIG_PCIE_PORT', if_true: files('pcie_root_port.c', 'gen_pcie_root_port.c', 'pcie_pci_bridge.c')) pci_ss.add(when: 'CONFIG_PXB', if_true: files('pci_expander_bridge.c')) pci_ss.add(when: 'CONFIG_XIO3130', if_true: files('xio3130_upstream.c', 'xio3130_downstream.c')) +pci_ss.add(when: 'CONFIG_CXL', if_true: files('cxl_root_port.c')) # NewWorld PowerMac pci_ss.add(when: 'CONFIG_DEC_PCI', if_true: files('dec.c')) diff --git a/hw/pci-bridge/pcie_root_port.c b/hw/pci-bridge/pcie_root_port.c index f1cfe9d..460e482 100644 --- a/hw/pci-bridge/pcie_root_port.c +++ b/hw/pci-bridge/pcie_root_port.c @@ -67,7 +67,11 @@ static void rp_realize(PCIDevice *d, Error **errp) int rc; pci_config_set_interrupt_pin(d->config, 1); - pci_bridge_initfn(d, TYPE_PCIE_BUS); + if (d->cap_present & QEMU_PCIE_CAP_CXL) { + pci_bridge_initfn(d, TYPE_CXL_BUS); + } else { + pci_bridge_initfn(d, TYPE_PCIE_BUS); + } pcie_port_init_reg(d); rc = pci_bridge_ssvid_init(d, rpc->ssvid_offset, dc->vendor_id, diff --git a/hw/pci/pci.c b/hw/pci/pci.c index 6c0656f..a9b37f8 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -2762,7 +2762,9 @@ static void pci_device_class_base_init(ObjectClass *klass, void *data) object_class_dynamic_cast(klass, INTERFACE_CONVENTIONAL_PCI_DEVICE); ObjectClass *pcie = object_class_dynamic_cast(klass, INTERFACE_PCIE_DEVICE); - assert(conventional || pcie); + ObjectClass *cxl = + object_class_dynamic_cast(klass, INTERFACE_CXL_DEVICE); + assert(conventional || pcie || cxl); } } -- cgit v1.1