1 /* 2 * CXL 2.0 Root Port Implementation 3 * 4 * Copyright(C) 2020 Intel Corporation. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, see <http://www.gnu.org/licenses/> 18 */ 19 20 #include "qemu/osdep.h" 21 #include "qemu/log.h" 22 #include "qemu/range.h" 23 #include "hw/pci/pci_bridge.h" 24 #include "hw/pci/pcie_port.h" 25 #include "hw/pci/msi.h" 26 #include "hw/qdev-properties.h" 27 #include "hw/sysbus.h" 28 #include "qapi/error.h" 29 #include "hw/cxl/cxl.h" 30 31 #define CXL_ROOT_PORT_DID 0x7075 32 33 #define CXL_RP_MSI_OFFSET 0x60 34 #define CXL_RP_MSI_SUPPORTED_FLAGS PCI_MSI_FLAGS_MASKBIT 35 #define CXL_RP_MSI_NR_VECTOR 2 36 37 /* Copied from the gen root port which we derive */ 38 #define GEN_PCIE_ROOT_PORT_AER_OFFSET 0x100 39 #define GEN_PCIE_ROOT_PORT_ACS_OFFSET \ 40 (GEN_PCIE_ROOT_PORT_AER_OFFSET + PCI_ERR_SIZEOF) 41 #define CXL_ROOT_PORT_DVSEC_OFFSET \ 42 (GEN_PCIE_ROOT_PORT_ACS_OFFSET + PCI_ACS_SIZEOF) 43 44 typedef struct CXLRootPort { 45 /*< private >*/ 46 PCIESlot parent_obj; 47 48 CXLComponentState cxl_cstate; 49 PCIResReserve res_reserve; 50 } CXLRootPort; 51 52 #define TYPE_CXL_ROOT_PORT "cxl-rp" 53 DECLARE_INSTANCE_CHECKER(CXLRootPort, CXL_ROOT_PORT, TYPE_CXL_ROOT_PORT) 54 55 /* 56 * If two MSI vector are allocated, Advanced Error Interrupt Message Number 57 * is 1. otherwise 0. 58 * 17.12.5.10 RPERRSTS, 32:27 bit Advanced Error Interrupt Message Number. 59 */ 60 static uint8_t cxl_rp_aer_vector(const PCIDevice *d) 61 { 62 switch (msi_nr_vectors_allocated(d)) { 63 case 1: 64 return 0; 65 case 2: 66 return 1; 67 case 4: 68 case 8: 69 case 16: 70 case 32: 71 default: 72 break; 73 } 74 abort(); 75 return 0; 76 } 77 78 static int cxl_rp_interrupts_init(PCIDevice *d, Error **errp) 79 { 80 int rc; 81 82 rc = msi_init(d, CXL_RP_MSI_OFFSET, CXL_RP_MSI_NR_VECTOR, 83 CXL_RP_MSI_SUPPORTED_FLAGS & PCI_MSI_FLAGS_64BIT, 84 CXL_RP_MSI_SUPPORTED_FLAGS & PCI_MSI_FLAGS_MASKBIT, 85 errp); 86 if (rc < 0) { 87 assert(rc == -ENOTSUP); 88 } 89 90 return rc; 91 } 92 93 static void cxl_rp_interrupts_uninit(PCIDevice *d) 94 { 95 msi_uninit(d); 96 } 97 98 static void latch_registers(CXLRootPort *crp) 99 { 100 uint32_t *reg_state = crp->cxl_cstate.crb.cache_mem_registers; 101 uint32_t *write_msk = crp->cxl_cstate.crb.cache_mem_regs_write_mask; 102 103 cxl_component_register_init_common(reg_state, write_msk, CXL2_ROOT_PORT); 104 } 105 106 static void build_dvsecs(CXLComponentState *cxl) 107 { 108 uint8_t *dvsec; 109 110 dvsec = (uint8_t *)&(CXLDVSECPortExt){ 0 }; 111 cxl_component_create_dvsec(cxl, CXL2_ROOT_PORT, 112 EXTENSIONS_PORT_DVSEC_LENGTH, 113 EXTENSIONS_PORT_DVSEC, 114 EXTENSIONS_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_ROOT_PORT, 122 GPF_PORT_DVSEC_LENGTH, GPF_PORT_DVSEC, 123 GPF_PORT_DVSEC_REVID, dvsec); 124 125 dvsec = (uint8_t *)&(CXLDVSECPortFlexBus){ 126 .cap = 0x26, /* IO, Mem, non-MLD */ 127 .ctrl = 0x2, 128 .status = 0x26, /* same */ 129 .rcvd_mod_ts_data_phase1 = 0xef, 130 }; 131 cxl_component_create_dvsec(cxl, CXL2_ROOT_PORT, 132 PCIE_FLEXBUS_PORT_DVSEC_LENGTH_2_0, 133 PCIE_FLEXBUS_PORT_DVSEC, 134 PCIE_FLEXBUS_PORT_DVSEC_REVID_2_0, dvsec); 135 136 dvsec = (uint8_t *)&(CXLDVSECRegisterLocator){ 137 .rsvd = 0, 138 .reg0_base_lo = RBI_COMPONENT_REG | CXL_COMPONENT_REG_BAR_IDX, 139 .reg0_base_hi = 0, 140 }; 141 cxl_component_create_dvsec(cxl, CXL2_ROOT_PORT, 142 REG_LOC_DVSEC_LENGTH, REG_LOC_DVSEC, 143 REG_LOC_DVSEC_REVID, dvsec); 144 } 145 146 static void cxl_rp_realize(DeviceState *dev, Error **errp) 147 { 148 PCIDevice *pci_dev = PCI_DEVICE(dev); 149 PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(dev); 150 CXLRootPort *crp = CXL_ROOT_PORT(dev); 151 CXLComponentState *cxl_cstate = &crp->cxl_cstate; 152 ComponentRegisters *cregs = &cxl_cstate->crb; 153 MemoryRegion *component_bar = &cregs->component_registers; 154 Error *local_err = NULL; 155 156 rpc->parent_realize(dev, &local_err); 157 if (local_err) { 158 error_propagate(errp, local_err); 159 return; 160 } 161 162 int rc = 163 pci_bridge_qemu_reserve_cap_init(pci_dev, 0, crp->res_reserve, errp); 164 if (rc < 0) { 165 rpc->parent_class.exit(pci_dev); 166 return; 167 } 168 169 if (!crp->res_reserve.io || crp->res_reserve.io == -1) { 170 pci_word_test_and_clear_mask(pci_dev->wmask + PCI_COMMAND, 171 PCI_COMMAND_IO); 172 pci_dev->wmask[PCI_IO_BASE] = 0; 173 pci_dev->wmask[PCI_IO_LIMIT] = 0; 174 } 175 176 cxl_cstate->dvsec_offset = CXL_ROOT_PORT_DVSEC_OFFSET; 177 cxl_cstate->pdev = pci_dev; 178 build_dvsecs(&crp->cxl_cstate); 179 180 cxl_component_register_block_init(OBJECT(pci_dev), cxl_cstate, 181 TYPE_CXL_ROOT_PORT); 182 183 pci_register_bar(pci_dev, CXL_COMPONENT_REG_BAR_IDX, 184 PCI_BASE_ADDRESS_SPACE_MEMORY | 185 PCI_BASE_ADDRESS_MEM_TYPE_64, 186 component_bar); 187 } 188 189 static void cxl_rp_reset_hold(Object *obj) 190 { 191 PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(obj); 192 CXLRootPort *crp = CXL_ROOT_PORT(obj); 193 194 if (rpc->parent_phases.hold) { 195 rpc->parent_phases.hold(obj); 196 } 197 198 latch_registers(crp); 199 } 200 201 static Property gen_rp_props[] = { 202 DEFINE_PROP_UINT32("bus-reserve", CXLRootPort, res_reserve.bus, -1), 203 DEFINE_PROP_SIZE("io-reserve", CXLRootPort, res_reserve.io, -1), 204 DEFINE_PROP_SIZE("mem-reserve", CXLRootPort, res_reserve.mem_non_pref, -1), 205 DEFINE_PROP_SIZE("pref32-reserve", CXLRootPort, res_reserve.mem_pref_32, 206 -1), 207 DEFINE_PROP_SIZE("pref64-reserve", CXLRootPort, res_reserve.mem_pref_64, 208 -1), 209 DEFINE_PROP_END_OF_LIST() 210 }; 211 212 static void cxl_rp_dvsec_write_config(PCIDevice *dev, uint32_t addr, 213 uint32_t val, int len) 214 { 215 CXLRootPort *crp = CXL_ROOT_PORT(dev); 216 217 if (range_contains(&crp->cxl_cstate.dvsecs[EXTENSIONS_PORT_DVSEC], addr)) { 218 uint8_t *reg = &dev->config[addr]; 219 addr -= crp->cxl_cstate.dvsecs[EXTENSIONS_PORT_DVSEC].lob; 220 if (addr == PORT_CONTROL_OFFSET) { 221 if (pci_get_word(reg) & PORT_CONTROL_UNMASK_SBR) { 222 /* unmask SBR */ 223 qemu_log_mask(LOG_UNIMP, "SBR mask control is not supported\n"); 224 } 225 if (pci_get_word(reg) & PORT_CONTROL_ALT_MEMID_EN) { 226 /* Alt Memory & ID Space Enable */ 227 qemu_log_mask(LOG_UNIMP, 228 "Alt Memory & ID space is not supported\n"); 229 } 230 } 231 } 232 } 233 234 static void cxl_rp_aer_vector_update(PCIDevice *d) 235 { 236 PCIERootPortClass *rpc = PCIE_ROOT_PORT_GET_CLASS(d); 237 238 if (rpc->aer_vector) { 239 pcie_aer_root_set_vector(d, rpc->aer_vector(d)); 240 } 241 } 242 243 static void cxl_rp_write_config(PCIDevice *d, uint32_t address, uint32_t val, 244 int len) 245 { 246 uint16_t slt_ctl, slt_sta; 247 uint32_t root_cmd = 248 pci_get_long(d->config + d->exp.aer_cap + PCI_ERR_ROOT_COMMAND); 249 250 pcie_cap_slot_get(d, &slt_ctl, &slt_sta); 251 pci_bridge_write_config(d, address, val, len); 252 cxl_rp_aer_vector_update(d); 253 pcie_cap_flr_write_config(d, address, val, len); 254 pcie_cap_slot_write_config(d, slt_ctl, slt_sta, address, val, len); 255 pcie_aer_write_config(d, address, val, len); 256 pcie_aer_root_write_config(d, address, val, len, root_cmd); 257 258 cxl_rp_dvsec_write_config(d, address, val, len); 259 } 260 261 static void cxl_root_port_class_init(ObjectClass *oc, void *data) 262 { 263 DeviceClass *dc = DEVICE_CLASS(oc); 264 PCIDeviceClass *k = PCI_DEVICE_CLASS(oc); 265 ResettableClass *rc = RESETTABLE_CLASS(oc); 266 PCIERootPortClass *rpc = PCIE_ROOT_PORT_CLASS(oc); 267 268 k->vendor_id = PCI_VENDOR_ID_INTEL; 269 k->device_id = CXL_ROOT_PORT_DID; 270 dc->desc = "CXL Root Port"; 271 k->revision = 0; 272 device_class_set_props(dc, gen_rp_props); 273 k->config_write = cxl_rp_write_config; 274 275 device_class_set_parent_realize(dc, cxl_rp_realize, &rpc->parent_realize); 276 resettable_class_set_parent_phases(rc, NULL, cxl_rp_reset_hold, NULL, 277 &rpc->parent_phases); 278 279 rpc->aer_offset = GEN_PCIE_ROOT_PORT_AER_OFFSET; 280 rpc->acs_offset = GEN_PCIE_ROOT_PORT_ACS_OFFSET; 281 rpc->aer_vector = cxl_rp_aer_vector; 282 rpc->interrupts_init = cxl_rp_interrupts_init; 283 rpc->interrupts_uninit = cxl_rp_interrupts_uninit; 284 285 dc->hotpluggable = false; 286 } 287 288 static const TypeInfo cxl_root_port_info = { 289 .name = TYPE_CXL_ROOT_PORT, 290 .parent = TYPE_PCIE_ROOT_PORT, 291 .instance_size = sizeof(CXLRootPort), 292 .class_init = cxl_root_port_class_init, 293 .interfaces = (InterfaceInfo[]) { 294 { INTERFACE_CXL_DEVICE }, 295 { } 296 }, 297 }; 298 299 static void cxl_register(void) 300 { 301 type_register_static(&cxl_root_port_info); 302 } 303 304 type_init(cxl_register); 305