1 /* 2 * Emulated CXL Switch Downstream Port 3 * 4 * Copyright (c) 2022 Huawei Technologies. 5 * 6 * Based on xio3130_downstream.c 7 * 8 * SPDX-License-Identifier: GPL-2.0-or-later 9 */ 10 11 #include "qemu/osdep.h" 12 #include "qemu/log.h" 13 #include "hw/pci/msi.h" 14 #include "hw/pci/pcie.h" 15 #include "hw/pci/pcie_port.h" 16 #include "qapi/error.h" 17 18 typedef struct CXLDownstreamPort { 19 /*< private >*/ 20 PCIESlot parent_obj; 21 22 /*< public >*/ 23 CXLComponentState cxl_cstate; 24 } CXLDownstreamPort; 25 26 #define TYPE_CXL_DSP "cxl-downstream" 27 DECLARE_INSTANCE_CHECKER(CXLDownstreamPort, CXL_DSP, TYPE_CXL_DSP) 28 29 #define CXL_DOWNSTREAM_PORT_MSI_OFFSET 0x70 30 #define CXL_DOWNSTREAM_PORT_MSI_NR_VECTOR 1 31 #define CXL_DOWNSTREAM_PORT_EXP_OFFSET 0x90 32 #define CXL_DOWNSTREAM_PORT_AER_OFFSET 0x100 33 #define CXL_DOWNSTREAM_PORT_DVSEC_OFFSET \ 34 (CXL_DOWNSTREAM_PORT_AER_OFFSET + PCI_ERR_SIZEOF) 35 36 static void latch_registers(CXLDownstreamPort *dsp) 37 { 38 uint32_t *reg_state = dsp->cxl_cstate.crb.cache_mem_registers; 39 uint32_t *write_msk = dsp->cxl_cstate.crb.cache_mem_regs_write_mask; 40 41 cxl_component_register_init_common(reg_state, write_msk, 42 CXL2_DOWNSTREAM_PORT); 43 } 44 45 /* TODO: Look at sharing this code acorss all CXL port types */ 46 static void cxl_dsp_dvsec_write_config(PCIDevice *dev, uint32_t addr, 47 uint32_t val, int len) 48 { 49 CXLDownstreamPort *dsp = CXL_DSP(dev); 50 CXLComponentState *cxl_cstate = &dsp->cxl_cstate; 51 52 if (range_contains(&cxl_cstate->dvsecs[EXTENSIONS_PORT_DVSEC], addr)) { 53 uint8_t *reg = &dev->config[addr]; 54 addr -= cxl_cstate->dvsecs[EXTENSIONS_PORT_DVSEC].lob; 55 if (addr == PORT_CONTROL_OFFSET) { 56 if (pci_get_word(reg) & PORT_CONTROL_UNMASK_SBR) { 57 /* unmask SBR */ 58 qemu_log_mask(LOG_UNIMP, "SBR mask control is not supported\n"); 59 } 60 if (pci_get_word(reg) & PORT_CONTROL_ALT_MEMID_EN) { 61 /* Alt Memory & ID Space Enable */ 62 qemu_log_mask(LOG_UNIMP, 63 "Alt Memory & ID space is not supported\n"); 64 65 } 66 } 67 } 68 } 69 70 static void cxl_dsp_config_write(PCIDevice *d, uint32_t address, 71 uint32_t val, int len) 72 { 73 uint16_t slt_ctl, slt_sta; 74 75 pcie_cap_slot_get(d, &slt_ctl, &slt_sta); 76 pci_bridge_write_config(d, address, val, len); 77 pcie_cap_flr_write_config(d, address, val, len); 78 pcie_cap_slot_write_config(d, slt_ctl, slt_sta, address, val, len); 79 pcie_aer_write_config(d, address, val, len); 80 81 cxl_dsp_dvsec_write_config(d, address, val, len); 82 } 83 84 static void cxl_dsp_reset(DeviceState *qdev) 85 { 86 PCIDevice *d = PCI_DEVICE(qdev); 87 CXLDownstreamPort *dsp = CXL_DSP(qdev); 88 89 pcie_cap_deverr_reset(d); 90 pcie_cap_slot_reset(d); 91 pcie_cap_arifwd_reset(d); 92 pci_bridge_reset(qdev); 93 94 latch_registers(dsp); 95 } 96 97 static void build_dvsecs(CXLComponentState *cxl) 98 { 99 uint8_t *dvsec; 100 101 dvsec = (uint8_t *)&(CXLDVSECPortExtensions){ 0 }; 102 cxl_component_create_dvsec(cxl, CXL2_DOWNSTREAM_PORT, 103 EXTENSIONS_PORT_DVSEC_LENGTH, 104 EXTENSIONS_PORT_DVSEC, 105 EXTENSIONS_PORT_DVSEC_REVID, dvsec); 106 107 dvsec = (uint8_t *)&(CXLDVSECPortFlexBus){ 108 .cap = 0x27, /* Cache, IO, Mem, non-MLD */ 109 .ctrl = 0x02, /* IO always enabled */ 110 .status = 0x26, /* same */ 111 .rcvd_mod_ts_data_phase1 = 0xef, /* WTF? */ 112 }; 113 cxl_component_create_dvsec(cxl, CXL2_DOWNSTREAM_PORT, 114 PCIE_FLEXBUS_PORT_DVSEC_LENGTH_2_0, 115 PCIE_FLEXBUS_PORT_DVSEC, 116 PCIE_FLEXBUS_PORT_DVSEC_REVID_2_0, dvsec); 117 118 dvsec = (uint8_t *)&(CXLDVSECPortGPF){ 119 .rsvd = 0, 120 .phase1_ctrl = 1, /* 1μs timeout */ 121 .phase2_ctrl = 1, /* 1μs timeout */ 122 }; 123 cxl_component_create_dvsec(cxl, CXL2_DOWNSTREAM_PORT, 124 GPF_PORT_DVSEC_LENGTH, GPF_PORT_DVSEC, 125 GPF_PORT_DVSEC_REVID, dvsec); 126 127 dvsec = (uint8_t *)&(CXLDVSECRegisterLocator){ 128 .rsvd = 0, 129 .reg0_base_lo = RBI_COMPONENT_REG | CXL_COMPONENT_REG_BAR_IDX, 130 .reg0_base_hi = 0, 131 }; 132 cxl_component_create_dvsec(cxl, CXL2_DOWNSTREAM_PORT, 133 REG_LOC_DVSEC_LENGTH, REG_LOC_DVSEC, 134 REG_LOC_DVSEC_REVID, dvsec); 135 } 136 137 static void cxl_dsp_realize(PCIDevice *d, Error **errp) 138 { 139 PCIEPort *p = PCIE_PORT(d); 140 PCIESlot *s = PCIE_SLOT(d); 141 CXLDownstreamPort *dsp = CXL_DSP(d); 142 CXLComponentState *cxl_cstate = &dsp->cxl_cstate; 143 ComponentRegisters *cregs = &cxl_cstate->crb; 144 MemoryRegion *component_bar = &cregs->component_registers; 145 int rc; 146 147 pci_bridge_initfn(d, TYPE_PCIE_BUS); 148 pcie_port_init_reg(d); 149 150 rc = msi_init(d, CXL_DOWNSTREAM_PORT_MSI_OFFSET, 151 CXL_DOWNSTREAM_PORT_MSI_NR_VECTOR, 152 true, true, errp); 153 if (rc) { 154 assert(rc == -ENOTSUP); 155 goto err_bridge; 156 } 157 158 rc = pcie_cap_init(d, CXL_DOWNSTREAM_PORT_EXP_OFFSET, 159 PCI_EXP_TYPE_DOWNSTREAM, p->port, 160 errp); 161 if (rc < 0) { 162 goto err_msi; 163 } 164 165 pcie_cap_flr_init(d); 166 pcie_cap_deverr_init(d); 167 pcie_cap_slot_init(d, s); 168 pcie_cap_arifwd_init(d); 169 170 pcie_chassis_create(s->chassis); 171 rc = pcie_chassis_add_slot(s); 172 if (rc < 0) { 173 error_setg(errp, "Can't add chassis slot, error %d", rc); 174 goto err_pcie_cap; 175 } 176 177 rc = pcie_aer_init(d, PCI_ERR_VER, CXL_DOWNSTREAM_PORT_AER_OFFSET, 178 PCI_ERR_SIZEOF, errp); 179 if (rc < 0) { 180 goto err_chassis; 181 } 182 183 cxl_cstate->dvsec_offset = CXL_DOWNSTREAM_PORT_DVSEC_OFFSET; 184 cxl_cstate->pdev = d; 185 build_dvsecs(cxl_cstate); 186 cxl_component_register_block_init(OBJECT(d), cxl_cstate, TYPE_CXL_DSP); 187 pci_register_bar(d, CXL_COMPONENT_REG_BAR_IDX, 188 PCI_BASE_ADDRESS_SPACE_MEMORY | 189 PCI_BASE_ADDRESS_MEM_TYPE_64, 190 component_bar); 191 192 return; 193 194 err_chassis: 195 pcie_chassis_del_slot(s); 196 err_pcie_cap: 197 pcie_cap_exit(d); 198 err_msi: 199 msi_uninit(d); 200 err_bridge: 201 pci_bridge_exitfn(d); 202 } 203 204 static void cxl_dsp_exitfn(PCIDevice *d) 205 { 206 PCIESlot *s = PCIE_SLOT(d); 207 208 pcie_aer_exit(d); 209 pcie_chassis_del_slot(s); 210 pcie_cap_exit(d); 211 msi_uninit(d); 212 pci_bridge_exitfn(d); 213 } 214 215 static void cxl_dsp_class_init(ObjectClass *oc, void *data) 216 { 217 DeviceClass *dc = DEVICE_CLASS(oc); 218 PCIDeviceClass *k = PCI_DEVICE_CLASS(oc); 219 220 k->config_write = cxl_dsp_config_write; 221 k->realize = cxl_dsp_realize; 222 k->exit = cxl_dsp_exitfn; 223 k->vendor_id = 0x19e5; /* Huawei */ 224 k->device_id = 0xa129; /* Emulated CXL Switch Downstream Port */ 225 k->revision = 0; 226 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 227 dc->desc = "CXL Switch Downstream Port"; 228 dc->reset = cxl_dsp_reset; 229 } 230 231 static const TypeInfo cxl_dsp_info = { 232 .name = TYPE_CXL_DSP, 233 .instance_size = sizeof(CXLDownstreamPort), 234 .parent = TYPE_PCIE_SLOT, 235 .class_init = cxl_dsp_class_init, 236 .interfaces = (InterfaceInfo[]) { 237 { INTERFACE_PCIE_DEVICE }, 238 { INTERFACE_CXL_DEVICE }, 239 { } 240 }, 241 }; 242 243 static void cxl_dsp_register_type(void) 244 { 245 type_register_static(&cxl_dsp_info); 246 } 247 248 type_init(cxl_dsp_register_type); 249