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 "hw/cxl/cxl.h" 17 #include "qapi/error.h" 18 19 typedef struct CXLDownstreamPort { 20 /*< private >*/ 21 PCIESlot parent_obj; 22 23 /*< public >*/ 24 CXLComponentState cxl_cstate; 25 } CXLDownstreamPort; 26 27 #define CXL_DOWNSTREAM_PORT_MSI_OFFSET 0x70 28 #define CXL_DOWNSTREAM_PORT_MSI_NR_VECTOR 1 29 #define CXL_DOWNSTREAM_PORT_EXP_OFFSET 0x90 30 #define CXL_DOWNSTREAM_PORT_AER_OFFSET 0x100 31 #define CXL_DOWNSTREAM_PORT_DVSEC_OFFSET \ 32 (CXL_DOWNSTREAM_PORT_AER_OFFSET + PCI_ERR_SIZEOF) 33 34 static void latch_registers(CXLDownstreamPort *dsp) 35 { 36 uint32_t *reg_state = dsp->cxl_cstate.crb.cache_mem_registers; 37 uint32_t *write_msk = dsp->cxl_cstate.crb.cache_mem_regs_write_mask; 38 39 cxl_component_register_init_common(reg_state, write_msk, 40 CXL2_DOWNSTREAM_PORT); 41 } 42 43 /* TODO: Look at sharing this code across all CXL port types */ 44 static void cxl_dsp_dvsec_write_config(PCIDevice *dev, uint32_t addr, 45 uint32_t val, int len) 46 { 47 CXLDownstreamPort *dsp = CXL_DSP(dev); 48 CXLComponentState *cxl_cstate = &dsp->cxl_cstate; 49 50 if (range_contains(&cxl_cstate->dvsecs[EXTENSIONS_PORT_DVSEC], addr)) { 51 uint8_t *reg = &dev->config[addr]; 52 addr -= cxl_cstate->dvsecs[EXTENSIONS_PORT_DVSEC].lob; 53 if (addr == PORT_CONTROL_OFFSET) { 54 if (pci_get_word(reg) & PORT_CONTROL_UNMASK_SBR) { 55 /* unmask SBR */ 56 qemu_log_mask(LOG_UNIMP, "SBR mask control is not supported\n"); 57 } 58 if (pci_get_word(reg) & PORT_CONTROL_ALT_MEMID_EN) { 59 /* Alt Memory & ID Space Enable */ 60 qemu_log_mask(LOG_UNIMP, 61 "Alt Memory & ID space is not supported\n"); 62 63 } 64 } 65 } 66 } 67 68 static void cxl_dsp_config_write(PCIDevice *d, uint32_t address, 69 uint32_t val, int len) 70 { 71 uint16_t slt_ctl, slt_sta; 72 73 pcie_cap_slot_get(d, &slt_ctl, &slt_sta); 74 pci_bridge_write_config(d, address, val, len); 75 pcie_cap_flr_write_config(d, address, val, len); 76 pcie_cap_slot_write_config(d, slt_ctl, slt_sta, address, val, len); 77 pcie_aer_write_config(d, address, val, len); 78 79 cxl_dsp_dvsec_write_config(d, address, val, len); 80 } 81 82 static void cxl_dsp_reset(DeviceState *qdev) 83 { 84 PCIDevice *d = PCI_DEVICE(qdev); 85 CXLDownstreamPort *dsp = CXL_DSP(qdev); 86 87 pcie_cap_deverr_reset(d); 88 pcie_cap_slot_reset(d); 89 pcie_cap_arifwd_reset(d); 90 pci_bridge_reset(qdev); 91 92 latch_registers(dsp); 93 } 94 95 static void build_dvsecs(CXLComponentState *cxl) 96 { 97 uint8_t *dvsec; 98 99 dvsec = (uint8_t *)&(CXLDVSECPortExt){ 0 }; 100 cxl_component_create_dvsec(cxl, CXL2_DOWNSTREAM_PORT, 101 EXTENSIONS_PORT_DVSEC_LENGTH, 102 EXTENSIONS_PORT_DVSEC, 103 EXTENSIONS_PORT_DVSEC_REVID, dvsec); 104 105 dvsec = (uint8_t *)&(CXLDVSECPortFlexBus){ 106 .cap = 0x27, /* Cache, IO, Mem, non-MLD */ 107 .ctrl = 0x02, /* IO always enabled */ 108 .status = 0x26, /* same */ 109 .rcvd_mod_ts_data_phase1 = 0xef, /* WTF? */ 110 }; 111 cxl_component_create_dvsec(cxl, CXL2_DOWNSTREAM_PORT, 112 PCIE_CXL3_FLEXBUS_PORT_DVSEC_LENGTH, 113 PCIE_FLEXBUS_PORT_DVSEC, 114 PCIE_CXL3_FLEXBUS_PORT_DVSEC_REVID, dvsec); 115 116 dvsec = (uint8_t *)&(CXLDVSECPortGPF){ 117 .rsvd = 0, 118 .phase1_ctrl = 1, /* 1μs timeout */ 119 .phase2_ctrl = 1, /* 1μs timeout */ 120 }; 121 cxl_component_create_dvsec(cxl, CXL2_DOWNSTREAM_PORT, 122 GPF_PORT_DVSEC_LENGTH, GPF_PORT_DVSEC, 123 GPF_PORT_DVSEC_REVID, dvsec); 124 125 dvsec = (uint8_t *)&(CXLDVSECRegisterLocator){ 126 .rsvd = 0, 127 .reg0_base_lo = RBI_COMPONENT_REG | CXL_COMPONENT_REG_BAR_IDX, 128 .reg0_base_hi = 0, 129 }; 130 cxl_component_create_dvsec(cxl, CXL2_DOWNSTREAM_PORT, 131 REG_LOC_DVSEC_LENGTH, REG_LOC_DVSEC, 132 REG_LOC_DVSEC_REVID, dvsec); 133 } 134 135 static void cxl_dsp_realize(PCIDevice *d, Error **errp) 136 { 137 PCIEPort *p = PCIE_PORT(d); 138 PCIESlot *s = PCIE_SLOT(d); 139 CXLDownstreamPort *dsp = CXL_DSP(d); 140 CXLComponentState *cxl_cstate = &dsp->cxl_cstate; 141 ComponentRegisters *cregs = &cxl_cstate->crb; 142 MemoryRegion *component_bar = &cregs->component_registers; 143 int rc; 144 145 pci_bridge_initfn(d, TYPE_PCIE_BUS); 146 pcie_port_init_reg(d); 147 148 rc = msi_init(d, CXL_DOWNSTREAM_PORT_MSI_OFFSET, 149 CXL_DOWNSTREAM_PORT_MSI_NR_VECTOR, 150 true, true, errp); 151 if (rc) { 152 assert(rc == -ENOTSUP); 153 goto err_bridge; 154 } 155 156 rc = pcie_cap_init(d, CXL_DOWNSTREAM_PORT_EXP_OFFSET, 157 PCI_EXP_TYPE_DOWNSTREAM, p->port, 158 errp); 159 if (rc < 0) { 160 goto err_msi; 161 } 162 163 pcie_cap_flr_init(d); 164 pcie_cap_deverr_init(d); 165 pcie_cap_slot_init(d, s); 166 pcie_cap_arifwd_init(d); 167 168 pcie_chassis_create(s->chassis); 169 rc = pcie_chassis_add_slot(s); 170 if (rc < 0) { 171 error_setg(errp, "Can't add chassis slot, error %d", rc); 172 goto err_pcie_cap; 173 } 174 175 rc = pcie_aer_init(d, PCI_ERR_VER, CXL_DOWNSTREAM_PORT_AER_OFFSET, 176 PCI_ERR_SIZEOF, errp); 177 if (rc < 0) { 178 goto err_chassis; 179 } 180 181 cxl_cstate->dvsec_offset = CXL_DOWNSTREAM_PORT_DVSEC_OFFSET; 182 cxl_cstate->pdev = d; 183 build_dvsecs(cxl_cstate); 184 cxl_component_register_block_init(OBJECT(d), cxl_cstate, TYPE_CXL_DSP); 185 pci_register_bar(d, CXL_COMPONENT_REG_BAR_IDX, 186 PCI_BASE_ADDRESS_SPACE_MEMORY | 187 PCI_BASE_ADDRESS_MEM_TYPE_64, 188 component_bar); 189 190 return; 191 192 err_chassis: 193 pcie_chassis_del_slot(s); 194 err_pcie_cap: 195 pcie_cap_exit(d); 196 err_msi: 197 msi_uninit(d); 198 err_bridge: 199 pci_bridge_exitfn(d); 200 } 201 202 static void cxl_dsp_exitfn(PCIDevice *d) 203 { 204 PCIESlot *s = PCIE_SLOT(d); 205 206 pcie_aer_exit(d); 207 pcie_chassis_del_slot(s); 208 pcie_cap_exit(d); 209 msi_uninit(d); 210 pci_bridge_exitfn(d); 211 } 212 213 static void cxl_dsp_instance_post_init(Object *obj) 214 { 215 PCIESlot *s = PCIE_SLOT(obj); 216 217 if (!s->speed) { 218 s->speed = QEMU_PCI_EXP_LNK_2_5GT; 219 } 220 221 if (!s->width) { 222 s->width = QEMU_PCI_EXP_LNK_X1; 223 } 224 } 225 226 static void cxl_dsp_class_init(ObjectClass *oc, void *data) 227 { 228 DeviceClass *dc = DEVICE_CLASS(oc); 229 PCIDeviceClass *k = PCI_DEVICE_CLASS(oc); 230 231 k->config_write = cxl_dsp_config_write; 232 k->realize = cxl_dsp_realize; 233 k->exit = cxl_dsp_exitfn; 234 k->vendor_id = 0x19e5; /* Huawei */ 235 k->device_id = 0xa129; /* Emulated CXL Switch Downstream Port */ 236 k->revision = 0; 237 set_bit(DEVICE_CATEGORY_BRIDGE, dc->categories); 238 dc->desc = "CXL Switch Downstream Port"; 239 dc->reset = cxl_dsp_reset; 240 } 241 242 static const TypeInfo cxl_dsp_info = { 243 .name = TYPE_CXL_DSP, 244 .instance_size = sizeof(CXLDownstreamPort), 245 .parent = TYPE_PCIE_SLOT, 246 .instance_post_init = cxl_dsp_instance_post_init, 247 .class_init = cxl_dsp_class_init, 248 .interfaces = (InterfaceInfo[]) { 249 { INTERFACE_PCIE_DEVICE }, 250 { INTERFACE_CXL_DEVICE }, 251 { } 252 }, 253 }; 254 255 static void cxl_dsp_register_type(void) 256 { 257 type_register_static(&cxl_dsp_info); 258 } 259 260 type_init(cxl_dsp_register_type); 261