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/notifier.h> 10 #include <linux/bitops.h> 11 #include <linux/log2.h> 12 #include <linux/node.h> 13 #include <linux/io.h> 14 15 /** 16 * DOC: cxl objects 17 * 18 * The CXL core objects like ports, decoders, and regions are shared 19 * between the subsystem drivers cxl_acpi, cxl_pci, and core drivers 20 * (port-driver, region-driver, nvdimm object-drivers... etc). 21 */ 22 23 /* CXL 2.0 8.2.4 CXL Component Register Layout and Definition */ 24 #define CXL_COMPONENT_REG_BLOCK_SIZE SZ_64K 25 26 /* CXL 2.0 8.2.5 CXL.cache and CXL.mem Registers*/ 27 #define CXL_CM_OFFSET 0x1000 28 #define CXL_CM_CAP_HDR_OFFSET 0x0 29 #define CXL_CM_CAP_HDR_ID_MASK GENMASK(15, 0) 30 #define CM_CAP_HDR_CAP_ID 1 31 #define CXL_CM_CAP_HDR_VERSION_MASK GENMASK(19, 16) 32 #define CM_CAP_HDR_CAP_VERSION 1 33 #define CXL_CM_CAP_HDR_CACHE_MEM_VERSION_MASK GENMASK(23, 20) 34 #define CM_CAP_HDR_CACHE_MEM_VERSION 1 35 #define CXL_CM_CAP_HDR_ARRAY_SIZE_MASK GENMASK(31, 24) 36 #define CXL_CM_CAP_PTR_MASK GENMASK(31, 20) 37 38 #define CXL_CM_CAP_CAP_ID_RAS 0x2 39 #define CXL_CM_CAP_CAP_ID_HDM 0x5 40 #define CXL_CM_CAP_CAP_HDM_VERSION 1 41 42 /* HDM decoders CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure */ 43 #define CXL_HDM_DECODER_CAP_OFFSET 0x0 44 #define CXL_HDM_DECODER_COUNT_MASK GENMASK(3, 0) 45 #define CXL_HDM_DECODER_TARGET_COUNT_MASK GENMASK(7, 4) 46 #define CXL_HDM_DECODER_INTERLEAVE_11_8 BIT(8) 47 #define CXL_HDM_DECODER_INTERLEAVE_14_12 BIT(9) 48 #define CXL_HDM_DECODER_CTRL_OFFSET 0x4 49 #define CXL_HDM_DECODER_ENABLE BIT(1) 50 #define CXL_HDM_DECODER0_BASE_LOW_OFFSET(i) (0x20 * (i) + 0x10) 51 #define CXL_HDM_DECODER0_BASE_HIGH_OFFSET(i) (0x20 * (i) + 0x14) 52 #define CXL_HDM_DECODER0_SIZE_LOW_OFFSET(i) (0x20 * (i) + 0x18) 53 #define CXL_HDM_DECODER0_SIZE_HIGH_OFFSET(i) (0x20 * (i) + 0x1c) 54 #define CXL_HDM_DECODER0_CTRL_OFFSET(i) (0x20 * (i) + 0x20) 55 #define CXL_HDM_DECODER0_CTRL_IG_MASK GENMASK(3, 0) 56 #define CXL_HDM_DECODER0_CTRL_IW_MASK GENMASK(7, 4) 57 #define CXL_HDM_DECODER0_CTRL_LOCK BIT(8) 58 #define CXL_HDM_DECODER0_CTRL_COMMIT BIT(9) 59 #define CXL_HDM_DECODER0_CTRL_COMMITTED BIT(10) 60 #define CXL_HDM_DECODER0_CTRL_COMMIT_ERROR BIT(11) 61 #define CXL_HDM_DECODER0_CTRL_HOSTONLY BIT(12) 62 #define CXL_HDM_DECODER0_TL_LOW(i) (0x20 * (i) + 0x24) 63 #define CXL_HDM_DECODER0_TL_HIGH(i) (0x20 * (i) + 0x28) 64 #define CXL_HDM_DECODER0_SKIP_LOW(i) CXL_HDM_DECODER0_TL_LOW(i) 65 #define CXL_HDM_DECODER0_SKIP_HIGH(i) CXL_HDM_DECODER0_TL_HIGH(i) 66 67 /* HDM decoder control register constants CXL 3.0 8.2.5.19.7 */ 68 #define CXL_DECODER_MIN_GRANULARITY 256 69 #define CXL_DECODER_MAX_ENCODED_IG 6 70 71 static inline int cxl_hdm_decoder_count(u32 cap_hdr) 72 { 73 int val = FIELD_GET(CXL_HDM_DECODER_COUNT_MASK, cap_hdr); 74 75 return val ? val * 2 : 1; 76 } 77 78 /* Encode defined in CXL 2.0 8.2.5.12.7 HDM Decoder Control Register */ 79 static inline int eig_to_granularity(u16 eig, unsigned int *granularity) 80 { 81 if (eig > CXL_DECODER_MAX_ENCODED_IG) 82 return -EINVAL; 83 *granularity = CXL_DECODER_MIN_GRANULARITY << eig; 84 return 0; 85 } 86 87 /* Encode defined in CXL ECN "3, 6, 12 and 16-way memory Interleaving" */ 88 static inline int eiw_to_ways(u8 eiw, unsigned int *ways) 89 { 90 switch (eiw) { 91 case 0 ... 4: 92 *ways = 1 << eiw; 93 break; 94 case 8 ... 10: 95 *ways = 3 << (eiw - 8); 96 break; 97 default: 98 return -EINVAL; 99 } 100 101 return 0; 102 } 103 104 static inline int granularity_to_eig(int granularity, u16 *eig) 105 { 106 if (granularity > SZ_16K || granularity < CXL_DECODER_MIN_GRANULARITY || 107 !is_power_of_2(granularity)) 108 return -EINVAL; 109 *eig = ilog2(granularity) - 8; 110 return 0; 111 } 112 113 static inline int ways_to_eiw(unsigned int ways, u8 *eiw) 114 { 115 if (ways > 16) 116 return -EINVAL; 117 if (is_power_of_2(ways)) { 118 *eiw = ilog2(ways); 119 return 0; 120 } 121 if (ways % 3) 122 return -EINVAL; 123 ways /= 3; 124 if (!is_power_of_2(ways)) 125 return -EINVAL; 126 *eiw = ilog2(ways) + 8; 127 return 0; 128 } 129 130 /* RAS Registers CXL 2.0 8.2.5.9 CXL RAS Capability Structure */ 131 #define CXL_RAS_UNCORRECTABLE_STATUS_OFFSET 0x0 132 #define CXL_RAS_UNCORRECTABLE_STATUS_MASK (GENMASK(16, 14) | GENMASK(11, 0)) 133 #define CXL_RAS_UNCORRECTABLE_MASK_OFFSET 0x4 134 #define CXL_RAS_UNCORRECTABLE_MASK_MASK (GENMASK(16, 14) | GENMASK(11, 0)) 135 #define CXL_RAS_UNCORRECTABLE_MASK_F256B_MASK BIT(8) 136 #define CXL_RAS_UNCORRECTABLE_SEVERITY_OFFSET 0x8 137 #define CXL_RAS_UNCORRECTABLE_SEVERITY_MASK (GENMASK(16, 14) | GENMASK(11, 0)) 138 #define CXL_RAS_CORRECTABLE_STATUS_OFFSET 0xC 139 #define CXL_RAS_CORRECTABLE_STATUS_MASK GENMASK(6, 0) 140 #define CXL_RAS_CORRECTABLE_MASK_OFFSET 0x10 141 #define CXL_RAS_CORRECTABLE_MASK_MASK GENMASK(6, 0) 142 #define CXL_RAS_CAP_CONTROL_OFFSET 0x14 143 #define CXL_RAS_CAP_CONTROL_FE_MASK GENMASK(5, 0) 144 #define CXL_RAS_HEADER_LOG_OFFSET 0x18 145 #define CXL_RAS_CAPABILITY_LENGTH 0x58 146 #define CXL_HEADERLOG_SIZE SZ_512 147 #define CXL_HEADERLOG_SIZE_U32 SZ_512 / sizeof(u32) 148 149 /* CXL 2.0 8.2.8.1 Device Capabilities Array Register */ 150 #define CXLDEV_CAP_ARRAY_OFFSET 0x0 151 #define CXLDEV_CAP_ARRAY_CAP_ID 0 152 #define CXLDEV_CAP_ARRAY_ID_MASK GENMASK_ULL(15, 0) 153 #define CXLDEV_CAP_ARRAY_COUNT_MASK GENMASK_ULL(47, 32) 154 /* CXL 2.0 8.2.8.2 CXL Device Capability Header Register */ 155 #define CXLDEV_CAP_HDR_CAP_ID_MASK GENMASK(15, 0) 156 /* CXL 2.0 8.2.8.2.1 CXL Device Capabilities */ 157 #define CXLDEV_CAP_CAP_ID_DEVICE_STATUS 0x1 158 #define CXLDEV_CAP_CAP_ID_PRIMARY_MAILBOX 0x2 159 #define CXLDEV_CAP_CAP_ID_SECONDARY_MAILBOX 0x3 160 #define CXLDEV_CAP_CAP_ID_MEMDEV 0x4000 161 162 /* CXL 3.0 8.2.8.3.1 Event Status Register */ 163 #define CXLDEV_DEV_EVENT_STATUS_OFFSET 0x00 164 #define CXLDEV_EVENT_STATUS_INFO BIT(0) 165 #define CXLDEV_EVENT_STATUS_WARN BIT(1) 166 #define CXLDEV_EVENT_STATUS_FAIL BIT(2) 167 #define CXLDEV_EVENT_STATUS_FATAL BIT(3) 168 169 #define CXLDEV_EVENT_STATUS_ALL (CXLDEV_EVENT_STATUS_INFO | \ 170 CXLDEV_EVENT_STATUS_WARN | \ 171 CXLDEV_EVENT_STATUS_FAIL | \ 172 CXLDEV_EVENT_STATUS_FATAL) 173 174 /* CXL rev 3.0 section 8.2.9.2.4; Table 8-52 */ 175 #define CXLDEV_EVENT_INT_MODE_MASK GENMASK(1, 0) 176 #define CXLDEV_EVENT_INT_MSGNUM_MASK GENMASK(7, 4) 177 178 /* CXL 2.0 8.2.8.4 Mailbox Registers */ 179 #define CXLDEV_MBOX_CAPS_OFFSET 0x00 180 #define CXLDEV_MBOX_CAP_PAYLOAD_SIZE_MASK GENMASK(4, 0) 181 #define CXLDEV_MBOX_CAP_BG_CMD_IRQ BIT(6) 182 #define CXLDEV_MBOX_CAP_IRQ_MSGNUM_MASK GENMASK(10, 7) 183 #define CXLDEV_MBOX_CTRL_OFFSET 0x04 184 #define CXLDEV_MBOX_CTRL_DOORBELL BIT(0) 185 #define CXLDEV_MBOX_CTRL_BG_CMD_IRQ BIT(2) 186 #define CXLDEV_MBOX_CMD_OFFSET 0x08 187 #define CXLDEV_MBOX_CMD_COMMAND_OPCODE_MASK GENMASK_ULL(15, 0) 188 #define CXLDEV_MBOX_CMD_PAYLOAD_LENGTH_MASK GENMASK_ULL(36, 16) 189 #define CXLDEV_MBOX_STATUS_OFFSET 0x10 190 #define CXLDEV_MBOX_STATUS_BG_CMD BIT(0) 191 #define CXLDEV_MBOX_STATUS_RET_CODE_MASK GENMASK_ULL(47, 32) 192 #define CXLDEV_MBOX_BG_CMD_STATUS_OFFSET 0x18 193 #define CXLDEV_MBOX_BG_CMD_COMMAND_OPCODE_MASK GENMASK_ULL(15, 0) 194 #define CXLDEV_MBOX_BG_CMD_COMMAND_PCT_MASK GENMASK_ULL(22, 16) 195 #define CXLDEV_MBOX_BG_CMD_COMMAND_RC_MASK GENMASK_ULL(47, 32) 196 #define CXLDEV_MBOX_BG_CMD_COMMAND_VENDOR_MASK GENMASK_ULL(63, 48) 197 #define CXLDEV_MBOX_PAYLOAD_OFFSET 0x20 198 199 /* 200 * Using struct_group() allows for per register-block-type helper routines, 201 * without requiring block-type agnostic code to include the prefix. 202 */ 203 struct cxl_regs { 204 /* 205 * Common set of CXL Component register block base pointers 206 * @hdm_decoder: CXL 2.0 8.2.5.12 CXL HDM Decoder Capability Structure 207 * @ras: CXL 2.0 8.2.5.9 CXL RAS Capability Structure 208 */ 209 struct_group_tagged(cxl_component_regs, component, 210 void __iomem *hdm_decoder; 211 void __iomem *ras; 212 ); 213 /* 214 * Common set of CXL Device register block base pointers 215 * @status: CXL 2.0 8.2.8.3 Device Status Registers 216 * @mbox: CXL 2.0 8.2.8.4 Mailbox Registers 217 * @memdev: CXL 2.0 8.2.8.5 Memory Device Registers 218 */ 219 struct_group_tagged(cxl_device_regs, device_regs, 220 void __iomem *status, *mbox, *memdev; 221 ); 222 223 struct_group_tagged(cxl_pmu_regs, pmu_regs, 224 void __iomem *pmu; 225 ); 226 227 /* 228 * RCH downstream port specific RAS register 229 * @aer: CXL 3.0 8.2.1.1 RCH Downstream Port RCRB 230 */ 231 struct_group_tagged(cxl_rch_regs, rch_regs, 232 void __iomem *dport_aer; 233 ); 234 }; 235 236 struct cxl_reg_map { 237 bool valid; 238 int id; 239 unsigned long offset; 240 unsigned long size; 241 }; 242 243 struct cxl_component_reg_map { 244 struct cxl_reg_map hdm_decoder; 245 struct cxl_reg_map ras; 246 }; 247 248 struct cxl_device_reg_map { 249 struct cxl_reg_map status; 250 struct cxl_reg_map mbox; 251 struct cxl_reg_map memdev; 252 }; 253 254 struct cxl_pmu_reg_map { 255 struct cxl_reg_map pmu; 256 }; 257 258 /** 259 * struct cxl_register_map - DVSEC harvested register block mapping parameters 260 * @host: device for devm operations and logging 261 * @base: virtual base of the register-block-BAR + @block_offset 262 * @resource: physical resource base of the register block 263 * @max_size: maximum mapping size to perform register search 264 * @reg_type: see enum cxl_regloc_type 265 * @component_map: cxl_reg_map for component registers 266 * @device_map: cxl_reg_maps for device registers 267 * @pmu_map: cxl_reg_maps for CXL Performance Monitoring Units 268 */ 269 struct cxl_register_map { 270 struct device *host; 271 void __iomem *base; 272 resource_size_t resource; 273 resource_size_t max_size; 274 u8 reg_type; 275 union { 276 struct cxl_component_reg_map component_map; 277 struct cxl_device_reg_map device_map; 278 struct cxl_pmu_reg_map pmu_map; 279 }; 280 }; 281 282 void cxl_probe_component_regs(struct device *dev, void __iomem *base, 283 struct cxl_component_reg_map *map); 284 void cxl_probe_device_regs(struct device *dev, void __iomem *base, 285 struct cxl_device_reg_map *map); 286 int cxl_map_component_regs(const struct cxl_register_map *map, 287 struct cxl_component_regs *regs, 288 unsigned long map_mask); 289 int cxl_map_device_regs(const struct cxl_register_map *map, 290 struct cxl_device_regs *regs); 291 int cxl_map_pmu_regs(struct cxl_register_map *map, struct cxl_pmu_regs *regs); 292 293 enum cxl_regloc_type; 294 int cxl_count_regblock(struct pci_dev *pdev, enum cxl_regloc_type type); 295 int cxl_find_regblock_instance(struct pci_dev *pdev, enum cxl_regloc_type type, 296 struct cxl_register_map *map, int index); 297 int cxl_find_regblock(struct pci_dev *pdev, enum cxl_regloc_type type, 298 struct cxl_register_map *map); 299 int cxl_setup_regs(struct cxl_register_map *map); 300 struct cxl_dport; 301 resource_size_t cxl_rcd_component_reg_phys(struct device *dev, 302 struct cxl_dport *dport); 303 304 #define CXL_RESOURCE_NONE ((resource_size_t) -1) 305 #define CXL_TARGET_STRLEN 20 306 307 /* 308 * cxl_decoder flags that define the type of memory / devices this 309 * decoder supports as well as configuration lock status See "CXL 2.0 310 * 8.2.5.12.7 CXL HDM Decoder 0 Control Register" for details. 311 * Additionally indicate whether decoder settings were autodetected, 312 * user customized. 313 */ 314 #define CXL_DECODER_F_RAM BIT(0) 315 #define CXL_DECODER_F_PMEM BIT(1) 316 #define CXL_DECODER_F_TYPE2 BIT(2) 317 #define CXL_DECODER_F_TYPE3 BIT(3) 318 #define CXL_DECODER_F_LOCK BIT(4) 319 #define CXL_DECODER_F_ENABLE BIT(5) 320 #define CXL_DECODER_F_MASK GENMASK(5, 0) 321 322 enum cxl_decoder_type { 323 CXL_DECODER_DEVMEM = 2, 324 CXL_DECODER_HOSTONLYMEM = 3, 325 }; 326 327 /* 328 * Current specification goes up to 8, double that seems a reasonable 329 * software max for the foreseeable future 330 */ 331 #define CXL_DECODER_MAX_INTERLEAVE 16 332 333 #define CXL_QOS_CLASS_INVALID -1 334 335 /** 336 * struct cxl_decoder - Common CXL HDM Decoder Attributes 337 * @dev: this decoder's device 338 * @id: kernel device name id 339 * @hpa_range: Host physical address range mapped by this decoder 340 * @interleave_ways: number of cxl_dports in this decode 341 * @interleave_granularity: data stride per dport 342 * @target_type: accelerator vs expander (type2 vs type3) selector 343 * @region: currently assigned region for this decoder 344 * @flags: memory type capabilities and locking 345 * @commit: device/decoder-type specific callback to commit settings to hw 346 * @reset: device/decoder-type specific callback to reset hw settings 347 */ 348 struct cxl_decoder { 349 struct device dev; 350 int id; 351 struct range hpa_range; 352 int interleave_ways; 353 int interleave_granularity; 354 enum cxl_decoder_type target_type; 355 struct cxl_region *region; 356 unsigned long flags; 357 int (*commit)(struct cxl_decoder *cxld); 358 int (*reset)(struct cxl_decoder *cxld); 359 }; 360 361 /* 362 * CXL_DECODER_DEAD prevents endpoints from being reattached to regions 363 * while cxld_unregister() is running 364 */ 365 enum cxl_decoder_mode { 366 CXL_DECODER_NONE, 367 CXL_DECODER_RAM, 368 CXL_DECODER_PMEM, 369 CXL_DECODER_MIXED, 370 CXL_DECODER_DEAD, 371 }; 372 373 static inline const char *cxl_decoder_mode_name(enum cxl_decoder_mode mode) 374 { 375 static const char * const names[] = { 376 [CXL_DECODER_NONE] = "none", 377 [CXL_DECODER_RAM] = "ram", 378 [CXL_DECODER_PMEM] = "pmem", 379 [CXL_DECODER_MIXED] = "mixed", 380 }; 381 382 if (mode >= CXL_DECODER_NONE && mode <= CXL_DECODER_MIXED) 383 return names[mode]; 384 return "mixed"; 385 } 386 387 /* 388 * Track whether this decoder is reserved for region autodiscovery, or 389 * free for userspace provisioning. 390 */ 391 enum cxl_decoder_state { 392 CXL_DECODER_STATE_MANUAL, 393 CXL_DECODER_STATE_AUTO, 394 }; 395 396 /** 397 * struct cxl_endpoint_decoder - Endpoint / SPA to DPA decoder 398 * @cxld: base cxl_decoder_object 399 * @dpa_res: actively claimed DPA span of this decoder 400 * @skip: offset into @dpa_res where @cxld.hpa_range maps 401 * @mode: which memory type / access-mode-partition this decoder targets 402 * @state: autodiscovery state 403 * @pos: interleave position in @cxld.region 404 */ 405 struct cxl_endpoint_decoder { 406 struct cxl_decoder cxld; 407 struct resource *dpa_res; 408 resource_size_t skip; 409 enum cxl_decoder_mode mode; 410 enum cxl_decoder_state state; 411 int pos; 412 }; 413 414 /** 415 * struct cxl_switch_decoder - Switch specific CXL HDM Decoder 416 * @cxld: base cxl_decoder object 417 * @nr_targets: number of elements in @target 418 * @target: active ordered target list in current decoder configuration 419 * 420 * The 'switch' decoder type represents the decoder instances of cxl_port's that 421 * route from the root of a CXL memory decode topology to the endpoints. They 422 * come in two flavors, root-level decoders, statically defined by platform 423 * firmware, and mid-level decoders, where interleave-granularity, 424 * interleave-width, and the target list are mutable. 425 */ 426 struct cxl_switch_decoder { 427 struct cxl_decoder cxld; 428 int nr_targets; 429 struct cxl_dport *target[]; 430 }; 431 432 struct cxl_root_decoder; 433 typedef struct cxl_dport *(*cxl_calc_hb_fn)(struct cxl_root_decoder *cxlrd, 434 int pos); 435 436 /** 437 * struct cxl_root_decoder - Static platform CXL address decoder 438 * @res: host / parent resource for region allocations 439 * @region_id: region id for next region provisioning event 440 * @calc_hb: which host bridge covers the n'th position by granularity 441 * @platform_data: platform specific configuration data 442 * @range_lock: sync region autodiscovery by address range 443 * @qos_class: QoS performance class cookie 444 * @cxlsd: base cxl switch decoder 445 */ 446 struct cxl_root_decoder { 447 struct resource *res; 448 atomic_t region_id; 449 cxl_calc_hb_fn calc_hb; 450 void *platform_data; 451 struct mutex range_lock; 452 int qos_class; 453 struct cxl_switch_decoder cxlsd; 454 }; 455 456 /* 457 * enum cxl_config_state - State machine for region configuration 458 * @CXL_CONFIG_IDLE: Any sysfs attribute can be written freely 459 * @CXL_CONFIG_INTERLEAVE_ACTIVE: region size has been set, no more 460 * changes to interleave_ways or interleave_granularity 461 * @CXL_CONFIG_ACTIVE: All targets have been added the region is now 462 * active 463 * @CXL_CONFIG_RESET_PENDING: see commit_store() 464 * @CXL_CONFIG_COMMIT: Soft-config has been committed to hardware 465 */ 466 enum cxl_config_state { 467 CXL_CONFIG_IDLE, 468 CXL_CONFIG_INTERLEAVE_ACTIVE, 469 CXL_CONFIG_ACTIVE, 470 CXL_CONFIG_RESET_PENDING, 471 CXL_CONFIG_COMMIT, 472 }; 473 474 /** 475 * struct cxl_region_params - region settings 476 * @state: allow the driver to lockdown further parameter changes 477 * @uuid: unique id for persistent regions 478 * @interleave_ways: number of endpoints in the region 479 * @interleave_granularity: capacity each endpoint contributes to a stripe 480 * @res: allocated iomem capacity for this region 481 * @targets: active ordered targets in current decoder configuration 482 * @nr_targets: number of targets 483 * 484 * State transitions are protected by the cxl_region_rwsem 485 */ 486 struct cxl_region_params { 487 enum cxl_config_state state; 488 uuid_t uuid; 489 int interleave_ways; 490 int interleave_granularity; 491 struct resource *res; 492 struct cxl_endpoint_decoder *targets[CXL_DECODER_MAX_INTERLEAVE]; 493 int nr_targets; 494 }; 495 496 /* 497 * Indicate whether this region has been assembled by autodetection or 498 * userspace assembly. Prevent endpoint decoders outside of automatic 499 * detection from being added to the region. 500 */ 501 #define CXL_REGION_F_AUTO 0 502 503 /* 504 * Require that a committed region successfully complete a teardown once 505 * any of its associated decoders have been torn down. This maintains 506 * the commit state for the region since there are committed decoders, 507 * but blocks cxl_region_probe(). 508 */ 509 #define CXL_REGION_F_NEEDS_RESET 1 510 511 /** 512 * struct cxl_region - CXL region 513 * @dev: This region's device 514 * @id: This region's id. Id is globally unique across all regions 515 * @mode: Endpoint decoder allocation / access mode 516 * @type: Endpoint decoder target type 517 * @cxl_nvb: nvdimm bridge for coordinating @cxlr_pmem setup / shutdown 518 * @cxlr_pmem: (for pmem regions) cached copy of the nvdimm bridge 519 * @flags: Region state flags 520 * @params: active + config params for the region 521 * @coord: QoS access coordinates for the region 522 * @memory_notifier: notifier for setting the access coordinates to node 523 */ 524 struct cxl_region { 525 struct device dev; 526 int id; 527 enum cxl_decoder_mode mode; 528 enum cxl_decoder_type type; 529 struct cxl_nvdimm_bridge *cxl_nvb; 530 struct cxl_pmem_region *cxlr_pmem; 531 unsigned long flags; 532 struct cxl_region_params params; 533 struct access_coordinate coord[ACCESS_COORDINATE_MAX]; 534 struct notifier_block memory_notifier; 535 }; 536 537 struct cxl_nvdimm_bridge { 538 int id; 539 struct device dev; 540 struct cxl_port *port; 541 struct nvdimm_bus *nvdimm_bus; 542 struct nvdimm_bus_descriptor nd_desc; 543 }; 544 545 #define CXL_DEV_ID_LEN 19 546 547 struct cxl_nvdimm { 548 struct device dev; 549 struct cxl_memdev *cxlmd; 550 u8 dev_id[CXL_DEV_ID_LEN]; /* for nvdimm, string of 'serial' */ 551 }; 552 553 struct cxl_pmem_region_mapping { 554 struct cxl_memdev *cxlmd; 555 struct cxl_nvdimm *cxl_nvd; 556 u64 start; 557 u64 size; 558 int position; 559 }; 560 561 struct cxl_pmem_region { 562 struct device dev; 563 struct cxl_region *cxlr; 564 struct nd_region *nd_region; 565 struct range hpa_range; 566 int nr_mappings; 567 struct cxl_pmem_region_mapping mapping[]; 568 }; 569 570 struct cxl_dax_region { 571 struct device dev; 572 struct cxl_region *cxlr; 573 struct range hpa_range; 574 }; 575 576 /** 577 * struct cxl_port - logical collection of upstream port devices and 578 * downstream port devices to construct a CXL memory 579 * decode hierarchy. 580 * @dev: this port's device 581 * @uport_dev: PCI or platform device implementing the upstream port capability 582 * @host_bridge: Shortcut to the platform attach point for this port 583 * @id: id for port device-name 584 * @dports: cxl_dport instances referenced by decoders 585 * @endpoints: cxl_ep instances, endpoints that are a descendant of this port 586 * @regions: cxl_region_ref instances, regions mapped by this port 587 * @parent_dport: dport that points to this port in the parent 588 * @decoder_ida: allocator for decoder ids 589 * @reg_map: component and ras register mapping parameters 590 * @nr_dports: number of entries in @dports 591 * @hdm_end: track last allocated HDM decoder instance for allocation ordering 592 * @commit_end: cursor to track highest committed decoder for commit ordering 593 * @dead: last ep has been removed, force port re-creation 594 * @depth: How deep this port is relative to the root. depth 0 is the root. 595 * @cdat: Cached CDAT data 596 * @cdat_available: Should a CDAT attribute be available in sysfs 597 * @pci_latency: Upstream latency in picoseconds 598 */ 599 struct cxl_port { 600 struct device dev; 601 struct device *uport_dev; 602 struct device *host_bridge; 603 int id; 604 struct xarray dports; 605 struct xarray endpoints; 606 struct xarray regions; 607 struct cxl_dport *parent_dport; 608 struct ida decoder_ida; 609 struct cxl_register_map reg_map; 610 int nr_dports; 611 int hdm_end; 612 int commit_end; 613 bool dead; 614 unsigned int depth; 615 struct cxl_cdat { 616 void *table; 617 size_t length; 618 } cdat; 619 bool cdat_available; 620 long pci_latency; 621 }; 622 623 /** 624 * struct cxl_root - logical collection of root cxl_port items 625 * 626 * @port: cxl_port member 627 * @ops: cxl root operations 628 */ 629 struct cxl_root { 630 struct cxl_port port; 631 const struct cxl_root_ops *ops; 632 }; 633 634 static inline struct cxl_root * 635 to_cxl_root(const struct cxl_port *port) 636 { 637 return container_of(port, struct cxl_root, port); 638 } 639 640 struct cxl_root_ops { 641 int (*qos_class)(struct cxl_root *cxl_root, 642 struct access_coordinate *coord, int entries, 643 int *qos_class); 644 }; 645 646 static inline struct cxl_dport * 647 cxl_find_dport_by_dev(struct cxl_port *port, const struct device *dport_dev) 648 { 649 return xa_load(&port->dports, (unsigned long)dport_dev); 650 } 651 652 struct cxl_rcrb_info { 653 resource_size_t base; 654 u16 aer_cap; 655 }; 656 657 /** 658 * struct cxl_dport - CXL downstream port 659 * @dport_dev: PCI bridge or firmware device representing the downstream link 660 * @reg_map: component and ras register mapping parameters 661 * @port_id: unique hardware identifier for dport in decoder target list 662 * @rcrb: Data about the Root Complex Register Block layout 663 * @rch: Indicate whether this dport was enumerated in RCH or VH mode 664 * @port: reference to cxl_port that contains this downstream port 665 * @regs: Dport parsed register blocks 666 * @sw_coord: access coordinates (performance) for switch from CDAT 667 * @hb_coord: access coordinates (performance) from ACPI generic port (host bridge) 668 * @link_latency: calculated PCIe downstream latency 669 */ 670 struct cxl_dport { 671 struct device *dport_dev; 672 struct cxl_register_map reg_map; 673 int port_id; 674 struct cxl_rcrb_info rcrb; 675 bool rch; 676 struct cxl_port *port; 677 struct cxl_regs regs; 678 struct access_coordinate sw_coord; 679 struct access_coordinate hb_coord[ACCESS_COORDINATE_MAX]; 680 long link_latency; 681 }; 682 683 /** 684 * struct cxl_ep - track an endpoint's interest in a port 685 * @ep: device that hosts a generic CXL endpoint (expander or accelerator) 686 * @dport: which dport routes to this endpoint on @port 687 * @next: cxl switch port across the link attached to @dport NULL if 688 * attached to an endpoint 689 */ 690 struct cxl_ep { 691 struct device *ep; 692 struct cxl_dport *dport; 693 struct cxl_port *next; 694 }; 695 696 /** 697 * struct cxl_region_ref - track a region's interest in a port 698 * @port: point in topology to install this reference 699 * @decoder: decoder assigned for @region in @port 700 * @region: region for this reference 701 * @endpoints: cxl_ep references for region members beneath @port 702 * @nr_targets_set: track how many targets have been programmed during setup 703 * @nr_eps: number of endpoints beneath @port 704 * @nr_targets: number of distinct targets needed to reach @nr_eps 705 */ 706 struct cxl_region_ref { 707 struct cxl_port *port; 708 struct cxl_decoder *decoder; 709 struct cxl_region *region; 710 struct xarray endpoints; 711 int nr_targets_set; 712 int nr_eps; 713 int nr_targets; 714 }; 715 716 /* 717 * The platform firmware device hosting the root is also the top of the 718 * CXL port topology. All other CXL ports have another CXL port as their 719 * parent and their ->uport_dev / host device is out-of-line of the port 720 * ancestry. 721 */ 722 static inline bool is_cxl_root(struct cxl_port *port) 723 { 724 return port->uport_dev == port->dev.parent; 725 } 726 727 int cxl_num_decoders_committed(struct cxl_port *port); 728 bool is_cxl_port(const struct device *dev); 729 struct cxl_port *to_cxl_port(const struct device *dev); 730 struct pci_bus; 731 int devm_cxl_register_pci_bus(struct device *host, struct device *uport_dev, 732 struct pci_bus *bus); 733 struct pci_bus *cxl_port_to_pci_bus(struct cxl_port *port); 734 struct cxl_port *devm_cxl_add_port(struct device *host, 735 struct device *uport_dev, 736 resource_size_t component_reg_phys, 737 struct cxl_dport *parent_dport); 738 struct cxl_root *devm_cxl_add_root(struct device *host, 739 const struct cxl_root_ops *ops); 740 struct cxl_root *find_cxl_root(struct cxl_port *port); 741 void put_cxl_root(struct cxl_root *cxl_root); 742 DEFINE_FREE(put_cxl_root, struct cxl_root *, if (_T) put_cxl_root(_T)) 743 744 int devm_cxl_enumerate_ports(struct cxl_memdev *cxlmd); 745 void cxl_bus_rescan(void); 746 void cxl_bus_drain(void); 747 struct cxl_port *cxl_pci_find_port(struct pci_dev *pdev, 748 struct cxl_dport **dport); 749 struct cxl_port *cxl_mem_find_port(struct cxl_memdev *cxlmd, 750 struct cxl_dport **dport); 751 bool schedule_cxl_memdev_detach(struct cxl_memdev *cxlmd); 752 753 struct cxl_dport *devm_cxl_add_dport(struct cxl_port *port, 754 struct device *dport, int port_id, 755 resource_size_t component_reg_phys); 756 struct cxl_dport *devm_cxl_add_rch_dport(struct cxl_port *port, 757 struct device *dport_dev, int port_id, 758 resource_size_t rcrb); 759 760 #ifdef CONFIG_PCIEAER_CXL 761 void cxl_setup_parent_dport(struct device *host, struct cxl_dport *dport); 762 #else 763 static inline void cxl_setup_parent_dport(struct device *host, 764 struct cxl_dport *dport) { } 765 #endif 766 767 struct cxl_decoder *to_cxl_decoder(struct device *dev); 768 struct cxl_root_decoder *to_cxl_root_decoder(struct device *dev); 769 struct cxl_switch_decoder *to_cxl_switch_decoder(struct device *dev); 770 struct cxl_endpoint_decoder *to_cxl_endpoint_decoder(struct device *dev); 771 bool is_root_decoder(struct device *dev); 772 bool is_switch_decoder(struct device *dev); 773 bool is_endpoint_decoder(struct device *dev); 774 struct cxl_root_decoder *cxl_root_decoder_alloc(struct cxl_port *port, 775 unsigned int nr_targets, 776 cxl_calc_hb_fn calc_hb); 777 struct cxl_dport *cxl_hb_modulo(struct cxl_root_decoder *cxlrd, int pos); 778 struct cxl_switch_decoder *cxl_switch_decoder_alloc(struct cxl_port *port, 779 unsigned int nr_targets); 780 int cxl_decoder_add(struct cxl_decoder *cxld, int *target_map); 781 struct cxl_endpoint_decoder *cxl_endpoint_decoder_alloc(struct cxl_port *port); 782 int cxl_decoder_add_locked(struct cxl_decoder *cxld, int *target_map); 783 int cxl_decoder_autoremove(struct device *host, struct cxl_decoder *cxld); 784 int cxl_endpoint_autoremove(struct cxl_memdev *cxlmd, struct cxl_port *endpoint); 785 786 /** 787 * struct cxl_endpoint_dvsec_info - Cached DVSEC info 788 * @mem_enabled: cached value of mem_enabled in the DVSEC at init time 789 * @ranges: Number of active HDM ranges this device uses. 790 * @port: endpoint port associated with this info instance 791 * @dvsec_range: cached attributes of the ranges in the DVSEC, PCIE_DEVICE 792 */ 793 struct cxl_endpoint_dvsec_info { 794 bool mem_enabled; 795 int ranges; 796 struct cxl_port *port; 797 struct range dvsec_range[2]; 798 }; 799 800 struct cxl_hdm; 801 struct cxl_hdm *devm_cxl_setup_hdm(struct cxl_port *port, 802 struct cxl_endpoint_dvsec_info *info); 803 int devm_cxl_enumerate_decoders(struct cxl_hdm *cxlhdm, 804 struct cxl_endpoint_dvsec_info *info); 805 int devm_cxl_add_passthrough_decoder(struct cxl_port *port); 806 int cxl_dvsec_rr_decode(struct device *dev, int dvsec, 807 struct cxl_endpoint_dvsec_info *info); 808 809 bool is_cxl_region(struct device *dev); 810 811 extern struct bus_type cxl_bus_type; 812 813 struct cxl_driver { 814 const char *name; 815 int (*probe)(struct device *dev); 816 void (*remove)(struct device *dev); 817 struct device_driver drv; 818 int id; 819 }; 820 821 static inline struct cxl_driver *to_cxl_drv(struct device_driver *drv) 822 { 823 return container_of(drv, struct cxl_driver, drv); 824 } 825 826 int __cxl_driver_register(struct cxl_driver *cxl_drv, struct module *owner, 827 const char *modname); 828 #define cxl_driver_register(x) __cxl_driver_register(x, THIS_MODULE, KBUILD_MODNAME) 829 void cxl_driver_unregister(struct cxl_driver *cxl_drv); 830 831 #define module_cxl_driver(__cxl_driver) \ 832 module_driver(__cxl_driver, cxl_driver_register, cxl_driver_unregister) 833 834 #define CXL_DEVICE_NVDIMM_BRIDGE 1 835 #define CXL_DEVICE_NVDIMM 2 836 #define CXL_DEVICE_PORT 3 837 #define CXL_DEVICE_ROOT 4 838 #define CXL_DEVICE_MEMORY_EXPANDER 5 839 #define CXL_DEVICE_REGION 6 840 #define CXL_DEVICE_PMEM_REGION 7 841 #define CXL_DEVICE_DAX_REGION 8 842 #define CXL_DEVICE_PMU 9 843 844 #define MODULE_ALIAS_CXL(type) MODULE_ALIAS("cxl:t" __stringify(type) "*") 845 #define CXL_MODALIAS_FMT "cxl:t%d" 846 847 struct cxl_nvdimm_bridge *to_cxl_nvdimm_bridge(struct device *dev); 848 struct cxl_nvdimm_bridge *devm_cxl_add_nvdimm_bridge(struct device *host, 849 struct cxl_port *port); 850 struct cxl_nvdimm *to_cxl_nvdimm(struct device *dev); 851 bool is_cxl_nvdimm(struct device *dev); 852 bool is_cxl_nvdimm_bridge(struct device *dev); 853 int devm_cxl_add_nvdimm(struct cxl_memdev *cxlmd); 854 struct cxl_nvdimm_bridge *cxl_find_nvdimm_bridge(struct cxl_memdev *cxlmd); 855 856 #ifdef CONFIG_CXL_REGION 857 bool is_cxl_pmem_region(struct device *dev); 858 struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev); 859 int cxl_add_to_region(struct cxl_port *root, 860 struct cxl_endpoint_decoder *cxled); 861 struct cxl_dax_region *to_cxl_dax_region(struct device *dev); 862 #else 863 static inline bool is_cxl_pmem_region(struct device *dev) 864 { 865 return false; 866 } 867 static inline struct cxl_pmem_region *to_cxl_pmem_region(struct device *dev) 868 { 869 return NULL; 870 } 871 static inline int cxl_add_to_region(struct cxl_port *root, 872 struct cxl_endpoint_decoder *cxled) 873 { 874 return 0; 875 } 876 static inline struct cxl_dax_region *to_cxl_dax_region(struct device *dev) 877 { 878 return NULL; 879 } 880 #endif 881 882 void cxl_endpoint_parse_cdat(struct cxl_port *port); 883 void cxl_switch_parse_cdat(struct cxl_port *port); 884 885 int cxl_endpoint_get_perf_coordinates(struct cxl_port *port, 886 struct access_coordinate *coord); 887 int cxl_hb_get_perf_coordinates(struct cxl_port *port, 888 struct access_coordinate *coord); 889 void cxl_region_perf_data_calculate(struct cxl_region *cxlr, 890 struct cxl_endpoint_decoder *cxled); 891 892 void cxl_memdev_update_perf(struct cxl_memdev *cxlmd); 893 894 void cxl_coordinates_combine(struct access_coordinate *out, 895 struct access_coordinate *c1, 896 struct access_coordinate *c2); 897 898 /* 899 * Unit test builds overrides this to __weak, find the 'strong' version 900 * of these symbols in tools/testing/cxl/. 901 */ 902 #ifndef __mock 903 #define __mock static 904 #endif 905 906 #endif /* __CXL_H__ */ 907