1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* Copyright(c) 2020 Intel Corporation. */ 3 4 #ifndef __CXL_H__ 5 #define __CXL_H__ 6 7 #include <linux/libnvdimm.h> 8 #include <linux/bitfield.h> 9 #include <linux/bitops.h> 10 #include <linux/log2.h> 11 #include <linux/io.h> 12 13 /** 14 * DOC: cxl objects 15 * 16 * The CXL core objects like ports, decoders, and regions are shared 17 * between the subsystem drivers cxl_acpi, cxl_pci, and core drivers 18 * (port-driver, region-driver, nvdimm object-drivers... etc). 19 */ 20 21 /* CXL 2.0 8.2.4 CXL Component Register Layout and Definition */ 22 #define CXL_COMPONENT_REG_BLOCK_SIZE SZ_64K 23 24 /* CXL 2.0 8.2.5 CXL.cache and CXL.mem Registers*/ 25 #define CXL_CM_OFFSET 0x1000 26 #define CXL_CM_CAP_HDR_OFFSET 0x0 27 #define CXL_CM_CAP_HDR_ID_MASK GENMASK(15, 0) 28 #define CM_CAP_HDR_CAP_ID 1 29 #define CXL_CM_CAP_HDR_VERSION_MASK GENMASK(19, 16) 30 #define CM_CAP_HDR_CAP_VERSION 1 31 #define CXL_CM_CAP_HDR_CACHE_MEM_VERSION_MASK GENMASK(23, 20) 32 #define CM_CAP_HDR_CACHE_MEM_VERSION 1 33 #define CXL_CM_CAP_HDR_ARRAY_SIZE_MASK GENMASK(31, 24) 34 #define CXL_CM_CAP_PTR_MASK GENMASK(31, 20) 35 36 #define CXL_CM_CAP_CAP_ID_RAS 0x2 37 #define CXL_CM_CAP_CAP_ID_HDM 0x5 38 #define CXL_CM_CAP_CAP_HDM_VERSION 1 39 40 /* HDM decoders CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure */ 41 #define CXL_HDM_DECODER_CAP_OFFSET 0x0 42 #define CXL_HDM_DECODER_COUNT_MASK GENMASK(3, 0) 43 #define CXL_HDM_DECODER_TARGET_COUNT_MASK GENMASK(7, 4) 44 #define CXL_HDM_DECODER_INTERLEAVE_11_8 BIT(8) 45 #define CXL_HDM_DECODER_INTERLEAVE_14_12 BIT(9) 46 #define CXL_HDM_DECODER_CTRL_OFFSET 0x4 47 #define CXL_HDM_DECODER_ENABLE BIT(1) 48 #define CXL_HDM_DECODER0_BASE_LOW_OFFSET(i) (0x20 * (i) + 0x10) 49 #define CXL_HDM_DECODER0_BASE_HIGH_OFFSET(i) (0x20 * (i) + 0x14) 50 #define CXL_HDM_DECODER0_SIZE_LOW_OFFSET(i) (0x20 * (i) + 0x18) 51 #define CXL_HDM_DECODER0_SIZE_HIGH_OFFSET(i) (0x20 * (i) + 0x1c) 52 #define CXL_HDM_DECODER0_CTRL_OFFSET(i) (0x20 * (i) + 0x20) 53 #define CXL_HDM_DECODER0_CTRL_IG_MASK GENMASK(3, 0) 54 #define CXL_HDM_DECODER0_CTRL_IW_MASK GENMASK(7, 4) 55 #define CXL_HDM_DECODER0_CTRL_LOCK BIT(8) 56 #define CXL_HDM_DECODER0_CTRL_COMMIT BIT(9) 57 #define CXL_HDM_DECODER0_CTRL_COMMITTED BIT(10) 58 #define CXL_HDM_DECODER0_CTRL_COMMIT_ERROR BIT(11) 59 #define CXL_HDM_DECODER0_CTRL_TYPE BIT(12) 60 #define CXL_HDM_DECODER0_TL_LOW(i) (0x20 * (i) + 0x24) 61 #define CXL_HDM_DECODER0_TL_HIGH(i) (0x20 * (i) + 0x28) 62 #define CXL_HDM_DECODER0_SKIP_LOW(i) CXL_HDM_DECODER0_TL_LOW(i) 63 #define CXL_HDM_DECODER0_SKIP_HIGH(i) CXL_HDM_DECODER0_TL_HIGH(i) 64 65 /* HDM decoder control register constants CXL 3.0 8.2.5.19.7 */ 66 #define CXL_DECODER_MIN_GRANULARITY 256 67 #define CXL_DECODER_MAX_ENCODED_IG 6 68 69 static inline int cxl_hdm_decoder_count(u32 cap_hdr) 70 { 71 int val = FIELD_GET(CXL_HDM_DECODER_COUNT_MASK, cap_hdr); 72 73 return val ? val * 2 : 1; 74 } 75 76 /* Encode defined in CXL 2.0 8.2.5.12.7 HDM Decoder Control Register */ 77 static inline int eig_to_granularity(u16 eig, unsigned int *granularity) 78 { 79 if (eig > CXL_DECODER_MAX_ENCODED_IG) 80 return -EINVAL; 81 *granularity = CXL_DECODER_MIN_GRANULARITY << eig; 82 return 0; 83 } 84 85 /* Encode defined in CXL ECN "3, 6, 12 and 16-way memory Interleaving" */ 86 static inline int eiw_to_ways(u8 eiw, unsigned int *ways) 87 { 88 switch (eiw) { 89 case 0 ... 4: 90 *ways = 1 << eiw; 91 break; 92 case 8 ... 10: 93 *ways = 3 << (eiw - 8); 94 break; 95 default: 96 return -EINVAL; 97 } 98 99 return 0; 100 } 101 102 static inline int granularity_to_eig(int granularity, u16 *eig) 103 { 104 if (granularity > SZ_16K || granularity < CXL_DECODER_MIN_GRANULARITY || 105 !is_power_of_2(granularity)) 106 return -EINVAL; 107 *eig = ilog2(granularity) - 8; 108 return 0; 109 } 110 111 static inline int ways_to_eiw(unsigned int ways, u8 *eiw) 112 { 113 if (ways > 16) 114 return -EINVAL; 115 if (is_power_of_2(ways)) { 116 *eiw = ilog2(ways); 117 return 0; 118 } 119 if (ways % 3) 120 return -EINVAL; 121 ways /= 3; 122 if (!is_power_of_2(ways)) 123 return -EINVAL; 124 *eiw = ilog2(ways) + 8; 125 return 0; 126 } 127 128 /* RAS Registers CXL 2.0 8.2.5.9 CXL RAS Capability Structure */ 129 #define CXL_RAS_UNCORRECTABLE_STATUS_OFFSET 0x0 130 #define CXL_RAS_UNCORRECTABLE_STATUS_MASK (GENMASK(16, 14) | GENMASK(11, 0)) 131 #define CXL_RAS_UNCORRECTABLE_MASK_OFFSET 0x4 132 #define CXL_RAS_UNCORRECTABLE_MASK_MASK (GENMASK(16, 14) | GENMASK(11, 0)) 133 #define CXL_RAS_UNCORRECTABLE_MASK_F256B_MASK BIT(8) 134 #define CXL_RAS_UNCORRECTABLE_SEVERITY_OFFSET 0x8 135 #define CXL_RAS_UNCORRECTABLE_SEVERITY_MASK (GENMASK(16, 14) | GENMASK(11, 0)) 136 #define CXL_RAS_CORRECTABLE_STATUS_OFFSET 0xC 137 #define CXL_RAS_CORRECTABLE_STATUS_MASK GENMASK(6, 0) 138 #define CXL_RAS_CORRECTABLE_MASK_OFFSET 0x10 139 #define CXL_RAS_CORRECTABLE_MASK_MASK GENMASK(6, 0) 140 #define CXL_RAS_CAP_CONTROL_OFFSET 0x14 141 #define CXL_RAS_CAP_CONTROL_FE_MASK GENMASK(5, 0) 142 #define CXL_RAS_HEADER_LOG_OFFSET 0x18 143 #define CXL_RAS_CAPABILITY_LENGTH 0x58 144 #define CXL_HEADERLOG_SIZE SZ_512 145 #define CXL_HEADERLOG_SIZE_U32 SZ_512 / sizeof(u32) 146 147 /* CXL 2.0 8.2.8.1 Device Capabilities Array Register */ 148 #define CXLDEV_CAP_ARRAY_OFFSET 0x0 149 #define CXLDEV_CAP_ARRAY_CAP_ID 0 150 #define CXLDEV_CAP_ARRAY_ID_MASK GENMASK_ULL(15, 0) 151 #define CXLDEV_CAP_ARRAY_COUNT_MASK GENMASK_ULL(47, 32) 152 /* CXL 2.0 8.2.8.2 CXL Device Capability Header Register */ 153 #define CXLDEV_CAP_HDR_CAP_ID_MASK GENMASK(15, 0) 154 /* CXL 2.0 8.2.8.2.1 CXL Device Capabilities */ 155 #define CXLDEV_CAP_CAP_ID_DEVICE_STATUS 0x1 156 #define CXLDEV_CAP_CAP_ID_PRIMARY_MAILBOX 0x2 157 #define CXLDEV_CAP_CAP_ID_SECONDARY_MAILBOX 0x3 158 #define CXLDEV_CAP_CAP_ID_MEMDEV 0x4000 159 160 /* CXL 3.0 8.2.8.3.1 Event Status Register */ 161 #define CXLDEV_DEV_EVENT_STATUS_OFFSET 0x00 162 #define CXLDEV_EVENT_STATUS_INFO BIT(0) 163 #define CXLDEV_EVENT_STATUS_WARN BIT(1) 164 #define CXLDEV_EVENT_STATUS_FAIL BIT(2) 165 #define CXLDEV_EVENT_STATUS_FATAL BIT(3) 166 167 #define CXLDEV_EVENT_STATUS_ALL (CXLDEV_EVENT_STATUS_INFO | \ 168 CXLDEV_EVENT_STATUS_WARN | \ 169 CXLDEV_EVENT_STATUS_FAIL | \ 170 CXLDEV_EVENT_STATUS_FATAL) 171 172 /* CXL rev 3.0 section 8.2.9.2.4; Table 8-52 */ 173 #define CXLDEV_EVENT_INT_MODE_MASK GENMASK(1, 0) 174 #define CXLDEV_EVENT_INT_MSGNUM_MASK GENMASK(7, 4) 175 176 /* CXL 2.0 8.2.8.4 Mailbox Registers */ 177 #define CXLDEV_MBOX_CAPS_OFFSET 0x00 178 #define CXLDEV_MBOX_CAP_PAYLOAD_SIZE_MASK GENMASK(4, 0) 179 #define CXLDEV_MBOX_CTRL_OFFSET 0x04 180 #define CXLDEV_MBOX_CTRL_DOORBELL BIT(0) 181 #define CXLDEV_MBOX_CMD_OFFSET 0x08 182 #define CXLDEV_MBOX_CMD_COMMAND_OPCODE_MASK GENMASK_ULL(15, 0) 183 #define CXLDEV_MBOX_CMD_PAYLOAD_LENGTH_MASK GENMASK_ULL(36, 16) 184 #define CXLDEV_MBOX_STATUS_OFFSET 0x10 185 #define CXLDEV_MBOX_STATUS_RET_CODE_MASK GENMASK_ULL(47, 32) 186 #define CXLDEV_MBOX_BG_CMD_STATUS_OFFSET 0x18 187 #define CXLDEV_MBOX_PAYLOAD_OFFSET 0x20 188 189 /* 190 * Using struct_group() allows for per register-block-type helper routines, 191 * without requiring block-type agnostic code to include the prefix. 192 */ 193 struct cxl_regs { 194 /* 195 * Common set of CXL Component register block base pointers 196 * @hdm_decoder: CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure 197 * @ras: CXL 2.0 8.2.5.9 CXL RAS Capability Structure 198 */ 199 struct_group_tagged(cxl_component_regs, component, 200 void __iomem *hdm_decoder; 201 void __iomem *ras; 202 ); 203 /* 204 * Common set of CXL Device register block base pointers 205 * @status: CXL 2.0 8.2.8.3 Device Status Registers 206 * @mbox: CXL 2.0 8.2.8.4 Mailbox Registers 207 * @memdev: CXL 2.0 8.2.8.5 Memory Device Registers 208 */ 209 struct_group_tagged(cxl_device_regs, device_regs, 210 void __iomem *status, *mbox, *memdev; 211 ); 212 }; 213 214 struct cxl_reg_map { 215 bool valid; 216 int id; 217 unsigned long offset; 218 unsigned long size; 219 }; 220 221 struct cxl_component_reg_map { 222 struct cxl_reg_map hdm_decoder; 223 struct cxl_reg_map ras; 224 }; 225 226 struct cxl_device_reg_map { 227 struct cxl_reg_map status; 228 struct cxl_reg_map mbox; 229 struct cxl_reg_map memdev; 230 }; 231 232 /** 233 * struct cxl_register_map - DVSEC harvested register block mapping parameters 234 * @base: virtual base of the register-block-BAR + @block_offset 235 * @resource: physical resource base of the register block 236 * @max_size: maximum mapping size to perform register search 237 * @reg_type: see enum cxl_regloc_type 238 * @component_map: cxl_reg_map for component registers 239 * @device_map: cxl_reg_maps for device registers 240 */ 241 struct cxl_register_map { 242 void __iomem *base; 243 resource_size_t resource; 244 resource_size_t max_size; 245 u8 reg_type; 246 union { 247 struct cxl_component_reg_map component_map; 248 struct cxl_device_reg_map device_map; 249 }; 250 }; 251 252 void cxl_probe_component_regs(struct device *dev, void __iomem *base, 253 struct cxl_component_reg_map *map); 254 void cxl_probe_device_regs(struct device *dev, void __iomem *base, 255 struct cxl_device_reg_map *map); 256 int cxl_map_component_regs(struct device *dev, struct cxl_component_regs *regs, 257 struct cxl_register_map *map, 258 unsigned long map_mask); 259 int cxl_map_device_regs(struct device *dev, struct cxl_device_regs *regs, 260 struct cxl_register_map *map); 261 262 enum cxl_regloc_type; 263 int cxl_find_regblock(struct pci_dev *pdev, enum cxl_regloc_type type, 264 struct cxl_register_map *map); 265 266 enum cxl_rcrb { 267 CXL_RCRB_DOWNSTREAM, 268 CXL_RCRB_UPSTREAM, 269 }; 270 resource_size_t cxl_rcrb_to_component(struct device *dev, 271 resource_size_t rcrb, 272 enum cxl_rcrb which); 273 274 #define CXL_RESOURCE_NONE ((resource_size_t) -1) 275 #define CXL_TARGET_STRLEN 20 276 277 /* 278 * cxl_decoder flags that define the type of memory / devices this 279 * decoder supports as well as configuration lock status See "CXL 2.0 280 * 8.2.5.12.7 CXL HDM Decoder 0 Control Register" for details. 281 * Additionally indicate whether decoder settings were autodetected, 282 * user customized. 283 */ 284 #define CXL_DECODER_F_RAM BIT(0) 285 #define CXL_DECODER_F_PMEM BIT(1) 286 #define CXL_DECODER_F_TYPE2 BIT(2) 287 #define CXL_DECODER_F_TYPE3 BIT(3) 288 #define CXL_DECODER_F_LOCK BIT(4) 289 #define CXL_DECODER_F_ENABLE BIT(5) 290 #define CXL_DECODER_F_MASK GENMASK(5, 0) 291 292 enum cxl_decoder_type { 293 CXL_DECODER_ACCELERATOR = 2, 294 CXL_DECODER_EXPANDER = 3, 295 }; 296 297 /* 298 * Current specification goes up to 8, double that seems a reasonable 299 * software max for the foreseeable future 300 */ 301 #define CXL_DECODER_MAX_INTERLEAVE 16 302 303 304 /** 305 * struct cxl_decoder - Common CXL HDM Decoder Attributes 306 * @dev: this decoder's device 307 * @id: kernel device name id 308 * @hpa_range: Host physical address range mapped by this decoder 309 * @interleave_ways: number of cxl_dports in this decode 310 * @interleave_granularity: data stride per dport 311 * @target_type: accelerator vs expander (type2 vs type3) selector 312 * @region: currently assigned region for this decoder 313 * @flags: memory type capabilities and locking 314 * @commit: device/decoder-type specific callback to commit settings to hw 315 * @reset: device/decoder-type specific callback to reset hw settings 316 */ 317 struct cxl_decoder { 318 struct device dev; 319 int id; 320 struct range hpa_range; 321 int interleave_ways; 322 int interleave_granularity; 323 enum cxl_decoder_type target_type; 324 struct cxl_region *region; 325 unsigned long flags; 326 int (*commit)(struct cxl_decoder *cxld); 327 int (*reset)(struct cxl_decoder *cxld); 328 }; 329 330 /* 331 * CXL_DECODER_DEAD prevents endpoints from being reattached to regions 332 * while cxld_unregister() is running 333 */ 334 enum cxl_decoder_mode { 335 CXL_DECODER_NONE, 336 CXL_DECODER_RAM, 337 CXL_DECODER_PMEM, 338 CXL_DECODER_MIXED, 339 CXL_DECODER_DEAD, 340 }; 341 342 static inline const char *cxl_decoder_mode_name(enum cxl_decoder_mode mode) 343 { 344 static const char * const names[] = { 345 [CXL_DECODER_NONE] = "none", 346 [CXL_DECODER_RAM] = "ram", 347 [CXL_DECODER_PMEM] = "pmem", 348 [CXL_DECODER_MIXED] = "mixed", 349 }; 350 351 if (mode >= CXL_DECODER_NONE && mode <= CXL_DECODER_MIXED) 352 return names[mode]; 353 return "mixed"; 354 } 355 356 /* 357 * Track whether this decoder is reserved for region autodiscovery, or 358 * free for userspace provisioning. 359 */ 360 enum cxl_decoder_state { 361 CXL_DECODER_STATE_MANUAL, 362 CXL_DECODER_STATE_AUTO, 363 }; 364 365 /** 366 * struct cxl_endpoint_decoder - Endpoint / SPA to DPA decoder 367 * @cxld: base cxl_decoder_object 368 * @dpa_res: actively claimed DPA span of this decoder 369 * @skip: offset into @dpa_res where @cxld.hpa_range maps 370 * @mode: which memory type / access-mode-partition this decoder targets 371 * @state: autodiscovery state 372 * @pos: interleave position in @cxld.region 373 */ 374 struct cxl_endpoint_decoder { 375 struct cxl_decoder cxld; 376 struct resource *dpa_res; 377 resource_size_t skip; 378 enum cxl_decoder_mode mode; 379 enum cxl_decoder_state state; 380 int pos; 381 }; 382 383 /** 384 * struct cxl_switch_decoder - Switch specific CXL HDM Decoder 385 * @cxld: base cxl_decoder object 386 * @target_lock: coordinate coherent reads of the target list 387 * @nr_targets: number of elements in @target 388 * @target: active ordered target list in current decoder configuration 389 * 390 * The 'switch' decoder type represents the decoder instances of cxl_port's that 391 * route from the root of a CXL memory decode topology to the endpoints. They 392 * come in two flavors, root-level decoders, statically defined by platform 393 * firmware, and mid-level decoders, where interleave-granularity, 394 * interleave-width, and the target list are mutable. 395 */ 396 struct cxl_switch_decoder { 397 struct cxl_decoder cxld; 398 seqlock_t target_lock; 399 int nr_targets; 400 struct cxl_dport *target[]; 401 }; 402 403 struct cxl_root_decoder; 404 typedef struct cxl_dport *(*cxl_calc_hb_fn)(struct cxl_root_decoder *cxlrd, 405 int pos); 406 407 /** 408 * struct cxl_root_decoder - Static platform CXL address decoder 409 * @res: host / parent resource for region allocations 410 * @region_id: region id for next region provisioning event 411 * @calc_hb: which host bridge covers the n'th position by granularity 412 * @platform_data: platform specific configuration data 413 * @range_lock: sync region autodiscovery by address range 414 * @cxlsd: base cxl switch decoder 415 */ 416 struct cxl_root_decoder { 417 struct resource *res; 418 atomic_t region_id; 419 cxl_calc_hb_fn calc_hb; 420 void *platform_data; 421 struct mutex range_lock; 422 struct cxl_switch_decoder cxlsd; 423 }; 424 425 /* 426 * enum cxl_config_state - State machine for region configuration 427 * @CXL_CONFIG_IDLE: Any sysfs attribute can be written freely 428 * @CXL_CONFIG_INTERLEAVE_ACTIVE: region size has been set, no more 429 * changes to interleave_ways or interleave_granularity 430 * @CXL_CONFIG_ACTIVE: All targets have been added the region is now 431 * active 432 * @CXL_CONFIG_RESET_PENDING: see commit_store() 433 * @CXL_CONFIG_COMMIT: Soft-config has been committed to hardware 434 */ 435 enum cxl_config_state { 436 CXL_CONFIG_IDLE, 437 CXL_CONFIG_INTERLEAVE_ACTIVE, 438 CXL_CONFIG_ACTIVE, 439 CXL_CONFIG_RESET_PENDING, 440 CXL_CONFIG_COMMIT, 441 }; 442 443 /** 444 * struct cxl_region_params - region settings 445 * @state: allow the driver to lockdown further parameter changes 446 * @uuid: unique id for persistent regions 447 * @interleave_ways: number of endpoints in the region 448 * @interleave_granularity: capacity each endpoint contributes to a stripe 449 * @res: allocated iomem capacity for this region 450 * @targets: active ordered targets in current decoder configuration 451 * @nr_targets: number of targets 452 * 453 * State transitions are protected by the cxl_region_rwsem 454 */ 455 struct cxl_region_params { 456 enum cxl_config_state state; 457 uuid_t uuid; 458 int interleave_ways; 459 int interleave_granularity; 460 struct resource *res; 461 struct cxl_endpoint_decoder *targets[CXL_DECODER_MAX_INTERLEAVE]; 462 int nr_targets; 463 }; 464 465 /* 466 * Flag whether this region needs to have its HPA span synchronized with 467 * CPU cache state at region activation time. 468 */ 469 #define CXL_REGION_F_INCOHERENT 0 470 471 /* 472 * Indicate whether this region has been assembled by autodetection or 473 * userspace assembly. Prevent endpoint decoders outside of automatic 474 * detection from being added to the region. 475 */ 476 #define CXL_REGION_F_AUTO 1 477 478 /** 479 * struct cxl_region - CXL region 480 * @dev: This region's device 481 * @id: This region's id. Id is globally unique across all regions 482 * @mode: Endpoint decoder allocation / access mode 483 * @type: Endpoint decoder target type 484 * @cxl_nvb: nvdimm bridge for coordinating @cxlr_pmem setup / shutdown 485 * @cxlr_pmem: (for pmem regions) cached copy of the nvdimm bridge 486 * @flags: Region state flags 487 * @params: active + config params for the region 488 */ 489 struct cxl_region { 490 struct device dev; 491 int id; 492 enum cxl_decoder_mode mode; 493 enum cxl_decoder_type type; 494 struct cxl_nvdimm_bridge *cxl_nvb; 495 struct cxl_pmem_region *cxlr_pmem; 496 unsigned long flags; 497 struct cxl_region_params params; 498 }; 499 500 struct cxl_nvdimm_bridge { 501 int id; 502 struct device dev; 503 struct cxl_port *port; 504 struct nvdimm_bus *nvdimm_bus; 505 struct nvdimm_bus_descriptor nd_desc; 506 }; 507 508 #define CXL_DEV_ID_LEN 19 509 510 struct cxl_nvdimm { 511 struct device dev; 512 struct cxl_memdev *cxlmd; 513 u8 dev_id[CXL_DEV_ID_LEN]; /* for nvdimm, string of 'serial' */ 514 }; 515 516 struct cxl_pmem_region_mapping { 517 struct cxl_memdev *cxlmd; 518 struct cxl_nvdimm *cxl_nvd; 519 u64 start; 520 u64 size; 521 int position; 522 }; 523 524 struct cxl_pmem_region { 525 struct device dev; 526 struct cxl_region *cxlr; 527 struct nd_region *nd_region; 528 struct range hpa_range; 529 int nr_mappings; 530 struct cxl_pmem_region_mapping mapping[]; 531 }; 532 533 struct cxl_dax_region { 534 struct device dev; 535 struct cxl_region *cxlr; 536 struct range hpa_range; 537 }; 538 539 /** 540 * struct cxl_port - logical collection of upstream port devices and 541 * downstream port devices to construct a CXL memory 542 * decode hierarchy. 543 * @dev: this port's device 544 * @uport: PCI or platform device implementing the upstream port capability 545 * @host_bridge: Shortcut to the platform attach point for this port 546 * @id: id for port device-name 547 * @dports: cxl_dport instances referenced by decoders 548 * @endpoints: cxl_ep instances, endpoints that are a descendant of this port 549 * @regions: cxl_region_ref instances, regions mapped by this port 550 * @parent_dport: dport that points to this port in the parent 551 * @decoder_ida: allocator for decoder ids 552 * @nr_dports: number of entries in @dports 553 * @hdm_end: track last allocated HDM decoder instance for allocation ordering 554 * @commit_end: cursor to track highest committed decoder for commit ordering 555 * @component_reg_phys: component register capability base address (optional) 556 * @dead: last ep has been removed, force port re-creation 557 * @depth: How deep this port is relative to the root. depth 0 is the root. 558 * @cdat: Cached CDAT data 559 * @cdat_available: Should a CDAT attribute be available in sysfs 560 */ 561 struct cxl_port { 562 struct device dev; 563 struct device *uport; 564 struct device *host_bridge; 565 int id; 566 struct xarray dports; 567 struct xarray endpoints; 568 struct xarray regions; 569 struct cxl_dport *parent_dport; 570 struct ida decoder_ida; 571 int nr_dports; 572 int hdm_end; 573 int commit_end; 574 resource_size_t component_reg_phys; 575 bool dead; 576 unsigned int depth; 577 struct cxl_cdat { 578 void *table; 579 size_t length; 580 } cdat; 581 bool cdat_available; 582 }; 583 584 static inline struct cxl_dport * 585 cxl_find_dport_by_dev(struct cxl_port *port, const struct device *dport_dev) 586 { 587 return xa_load(&port->dports, (unsigned long)dport_dev); 588 } 589 590 /** 591 * struct cxl_dport - CXL downstream port 592 * @dport: PCI bridge or firmware device representing the downstream link 593 * @port_id: unique hardware identifier for dport in decoder target list 594 * @component_reg_phys: downstream port component registers 595 * @rcrb: base address for the Root Complex Register Block 596 * @rch: Indicate whether this dport was enumerated in RCH or VH mode 597 * @port: reference to cxl_port that contains this downstream port 598 */ 599 struct cxl_dport { 600 struct device *dport; 601 int port_id; 602 resource_size_t component_reg_phys; 603 resource_size_t rcrb; 604 bool rch; 605 struct cxl_port *port; 606 }; 607 608 /** 609 * struct cxl_ep - track an endpoint's interest in a port 610 * @ep: device that hosts a generic CXL endpoint (expander or accelerator) 611 * @dport: which dport routes to this endpoint on @port 612 * @next: cxl switch port across the link attached to @dport NULL if 613 * attached to an endpoint 614 */ 615 struct cxl_ep { 616 struct device *ep; 617 struct cxl_dport *dport; 618 struct cxl_port *next; 619 }; 620 621 /** 622 * struct cxl_region_ref - track a region's interest in a port 623 * @port: point in topology to install this reference 624 * @decoder: decoder assigned for @region in @port 625 * @region: region for this reference 626 * @endpoints: cxl_ep references for region members beneath @port 627 * @nr_targets_set: track how many targets have been programmed during setup 628 * @nr_eps: number of endpoints beneath @port 629 * @nr_targets: number of distinct targets needed to reach @nr_eps 630 */ 631 struct cxl_region_ref { 632 struct cxl_port *port; 633 struct cxl_decoder *decoder; 634 struct cxl_region *region; 635 struct xarray endpoints; 636 int nr_targets_set; 637 int nr_eps; 638 int nr_targets; 639 }; 640 641 /* 642 * The platform firmware device hosting the root is also the top of the 643 * CXL port topology. All other CXL ports have another CXL port as their 644 * parent and their ->uport / host device is out-of-line of the port 645 * ancestry. 646 */ 647 static inline bool is_cxl_root(struct cxl_port *port) 648 { 649 return port->uport == port->dev.parent; 650 } 651 652 bool is_cxl_port(const struct device *dev); 653 struct cxl_port *to_cxl_port(const struct device *dev); 654 struct pci_bus; 655 int devm_cxl_register_pci_bus(struct device *host, struct device *uport, 656 struct pci_bus *bus); 657 struct pci_bus *cxl_port_to_pci_bus(struct cxl_port *port); 658 struct cxl_port *devm_cxl_add_port(struct device *host, struct device *uport, 659 resource_size_t component_reg_phys, 660 struct cxl_dport *parent_dport); 661 struct cxl_port *find_cxl_root(struct device *dev); 662 int devm_cxl_enumerate_ports(struct cxl_memdev *cxlmd); 663 void cxl_bus_rescan(void); 664 void cxl_bus_drain(void); 665 struct cxl_port *cxl_mem_find_port(struct cxl_memdev *cxlmd, 666 struct cxl_dport **dport); 667 bool schedule_cxl_memdev_detach(struct cxl_memdev *cxlmd); 668 669 struct cxl_dport *devm_cxl_add_dport(struct cxl_port *port, 670 struct device *dport, int port_id, 671 resource_size_t component_reg_phys); 672 struct cxl_dport *devm_cxl_add_rch_dport(struct cxl_port *port, 673 struct device *dport_dev, int port_id, 674 resource_size_t component_reg_phys, 675 resource_size_t rcrb); 676 677 struct cxl_decoder *to_cxl_decoder(struct device *dev); 678 struct cxl_root_decoder *to_cxl_root_decoder(struct device *dev); 679 struct cxl_switch_decoder *to_cxl_switch_decoder(struct device *dev); 680 struct cxl_endpoint_decoder *to_cxl_endpoint_decoder(struct device *dev); 681 bool is_root_decoder(struct device *dev); 682 bool is_switch_decoder(struct device *dev); 683 bool is_endpoint_decoder(struct device *dev); 684 struct cxl_root_decoder *cxl_root_decoder_alloc(struct cxl_port *port, 685 unsigned int nr_targets, 686 cxl_calc_hb_fn calc_hb); 687 struct cxl_dport *cxl_hb_modulo(struct cxl_root_decoder *cxlrd, int pos); 688 struct cxl_switch_decoder *cxl_switch_decoder_alloc(struct cxl_port *port, 689 unsigned int nr_targets); 690 int cxl_decoder_add(struct cxl_decoder *cxld, int *target_map); 691 struct cxl_endpoint_decoder *cxl_endpoint_decoder_alloc(struct cxl_port *port); 692 int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map); 693 int cxl_decoder_autoremove(struct device *host, struct cxl_decoder *cxld); 694 int cxl_endpoint_autoremove(struct cxl_memdev *cxlmd, struct cxl_port *endpoint); 695 696 /** 697 * struct cxl_endpoint_dvsec_info - Cached DVSEC info 698 * @mem_enabled: cached value of mem_enabled in the DVSEC, PCIE_DEVICE 699 * @ranges: Number of active HDM ranges this device uses. 700 * @dvsec_range: cached attributes of the ranges in the DVSEC, PCIE_DEVICE 701 */ 702 struct cxl_endpoint_dvsec_info { 703 bool mem_enabled; 704 int ranges; 705 struct range dvsec_range[2]; 706 }; 707 708 struct cxl_hdm; 709 struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port, 710 struct cxl_endpoint_dvsec_info *info); 711 int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm, 712 struct cxl_endpoint_dvsec_info *info); 713 int devm_cxl_add_passthrough_decoder(struct cxl_port *port); 714 int cxl_dvsec_rr_decode(struct device *dev, int dvsec, 715 struct cxl_endpoint_dvsec_info *info); 716 717 bool is_cxl_region(struct device *dev); 718 719 extern struct bus_type cxl_bus_type; 720 721 struct cxl_driver { 722 const char *name; 723 int (*probe)(struct device *dev); 724 void (*remove)(struct device *dev); 725 struct device_driver drv; 726 int id; 727 }; 728 729 static inline struct cxl_driver *to_cxl_drv(struct device_driver *drv) 730 { 731 return container_of(drv, struct cxl_driver, drv); 732 } 733 734 int __cxl_driver_register(struct cxl_driver *cxl_drv, struct module *owner, 735 const char *modname); 736 #define cxl_driver_register(x) __cxl_driver_register(x, THIS_MODULE, KBUILD_MODNAME) 737 void cxl_driver_unregister(struct cxl_driver *cxl_drv); 738 739 #define module_cxl_driver(__cxl_driver) \ 740 module_driver(__cxl_driver, cxl_driver_register, cxl_driver_unregister) 741 742 #define CXL_DEVICE_NVDIMM_BRIDGE 1 743 #define CXL_DEVICE_NVDIMM 2 744 #define CXL_DEVICE_PORT 3 745 #define CXL_DEVICE_ROOT 4 746 #define CXL_DEVICE_MEMORY_EXPANDER 5 747 #define CXL_DEVICE_REGION 6 748 #define CXL_DEVICE_PMEM_REGION 7 749 #define CXL_DEVICE_DAX_REGION 8 750 751 #define MODULE_ALIAS_CXL(type) MODULE_ALIAS("cxl:t" __stringify(type) "*") 752 #define CXL_MODALIAS_FMT "cxl:t%d" 753 754 struct cxl_nvdimm_bridge *to_cxl_nvdimm_bridge(struct device *dev); 755 struct cxl_nvdimm_bridge *devm_cxl_add_nvdimm_bridge(struct device *host, 756 struct cxl_port *port); 757 struct cxl_nvdimm *to_cxl_nvdimm(struct device *dev); 758 bool is_cxl_nvdimm(struct device *dev); 759 bool is_cxl_nvdimm_bridge(struct device *dev); 760 int devm_cxl_add_nvdimm(struct cxl_memdev *cxlmd); 761 struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(struct device *dev); 762 763 #ifdef CONFIG_CXL_REGION 764 bool is_cxl_pmem_region(struct device *dev); 765 struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev); 766 int cxl_add_to_region(struct cxl_port *root, 767 struct cxl_endpoint_decoder *cxled); 768 struct cxl_dax_region *to_cxl_dax_region(struct device *dev); 769 #else 770 static inline bool is_cxl_pmem_region(struct device *dev) 771 { 772 return false; 773 } 774 static inline struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev) 775 { 776 return NULL; 777 } 778 static inline int cxl_add_to_region(struct cxl_port *root, 779 struct cxl_endpoint_decoder *cxled) 780 { 781 return 0; 782 } 783 static inline struct cxl_dax_region *to_cxl_dax_region(struct device *dev) 784 { 785 return NULL; 786 } 787 #endif 788 789 /* 790 * Unit test builds overrides this to __weak, find the 'strong' version 791 * of these symbols in tools/testing/cxl/. 792 */ 793 #ifndef __mock 794 #define __mock static 795 #endif 796 797 #endif /* __CXL_H__ */ 798