1 // SPDX-License-Identifier: GPL-2.0-only 2 /* Copyright(c) 2024-2025 Intel Corporation. All rights reserved. */ 3 #include <linux/fwctl.h> 4 #include <linux/device.h> 5 #include <cxl/mailbox.h> 6 #include <cxl/features.h> 7 #include <uapi/fwctl/cxl.h> 8 #include "cxl.h" 9 #include "core.h" 10 #include "cxlmem.h" 11 12 /** 13 * DOC: cxl features 14 * 15 * CXL Features: 16 * A CXL device that includes a mailbox supports commands that allows 17 * listing, getting, and setting of optionally defined features such 18 * as memory sparing or post package sparing. Vendors may define custom 19 * features for the device. 20 */ 21 22 /* All the features below are exclusive to the kernel */ 23 static const uuid_t cxl_exclusive_feats[] = { 24 CXL_FEAT_PATROL_SCRUB_UUID, 25 CXL_FEAT_ECS_UUID, 26 CXL_FEAT_SPPR_UUID, 27 CXL_FEAT_HPPR_UUID, 28 CXL_FEAT_CACHELINE_SPARING_UUID, 29 CXL_FEAT_ROW_SPARING_UUID, 30 CXL_FEAT_BANK_SPARING_UUID, 31 CXL_FEAT_RANK_SPARING_UUID, 32 }; 33 34 static bool is_cxl_feature_exclusive_by_uuid(const uuid_t *uuid) 35 { 36 for (int i = 0; i < ARRAY_SIZE(cxl_exclusive_feats); i++) { 37 if (uuid_equal(uuid, &cxl_exclusive_feats[i])) 38 return true; 39 } 40 41 return false; 42 } 43 44 static bool is_cxl_feature_exclusive(struct cxl_feat_entry *entry) 45 { 46 return is_cxl_feature_exclusive_by_uuid(&entry->uuid); 47 } 48 49 struct cxl_features_state *to_cxlfs(struct cxl_dev_state *cxlds) 50 { 51 return cxlds->cxlfs; 52 } 53 EXPORT_SYMBOL_NS_GPL(to_cxlfs, "CXL"); 54 55 static int cxl_get_supported_features_count(struct cxl_mailbox *cxl_mbox) 56 { 57 struct cxl_mbox_get_sup_feats_out mbox_out; 58 struct cxl_mbox_get_sup_feats_in mbox_in; 59 struct cxl_mbox_cmd mbox_cmd; 60 int rc; 61 62 memset(&mbox_in, 0, sizeof(mbox_in)); 63 mbox_in.count = cpu_to_le32(sizeof(mbox_out)); 64 memset(&mbox_out, 0, sizeof(mbox_out)); 65 mbox_cmd = (struct cxl_mbox_cmd) { 66 .opcode = CXL_MBOX_OP_GET_SUPPORTED_FEATURES, 67 .size_in = sizeof(mbox_in), 68 .payload_in = &mbox_in, 69 .size_out = sizeof(mbox_out), 70 .payload_out = &mbox_out, 71 .min_out = sizeof(mbox_out), 72 }; 73 rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); 74 if (rc < 0) 75 return rc; 76 77 return le16_to_cpu(mbox_out.supported_feats); 78 } 79 80 static struct cxl_feat_entries * 81 get_supported_features(struct cxl_features_state *cxlfs) 82 { 83 int remain_feats, max_size, max_feats, start, rc, hdr_size; 84 struct cxl_mailbox *cxl_mbox = &cxlfs->cxlds->cxl_mbox; 85 int feat_size = sizeof(struct cxl_feat_entry); 86 struct cxl_mbox_get_sup_feats_in mbox_in; 87 struct cxl_feat_entry *entry; 88 struct cxl_mbox_cmd mbox_cmd; 89 int user_feats = 0; 90 int count; 91 92 count = cxl_get_supported_features_count(cxl_mbox); 93 if (count <= 0) 94 return NULL; 95 96 struct cxl_feat_entries *entries __free(kvfree) = 97 kvmalloc(struct_size(entries, ent, count), GFP_KERNEL); 98 if (!entries) 99 return NULL; 100 101 struct cxl_mbox_get_sup_feats_out *mbox_out __free(kvfree) = 102 kvmalloc(cxl_mbox->payload_size, GFP_KERNEL); 103 if (!mbox_out) 104 return NULL; 105 106 hdr_size = struct_size(mbox_out, ents, 0); 107 max_size = cxl_mbox->payload_size - hdr_size; 108 /* max feat entries that can fit in mailbox max payload size */ 109 max_feats = max_size / feat_size; 110 entry = entries->ent; 111 112 start = 0; 113 remain_feats = count; 114 do { 115 int retrieved, alloc_size, copy_feats; 116 int num_entries; 117 118 if (remain_feats > max_feats) { 119 alloc_size = struct_size(mbox_out, ents, max_feats); 120 remain_feats = remain_feats - max_feats; 121 copy_feats = max_feats; 122 } else { 123 alloc_size = struct_size(mbox_out, ents, remain_feats); 124 copy_feats = remain_feats; 125 remain_feats = 0; 126 } 127 128 memset(&mbox_in, 0, sizeof(mbox_in)); 129 mbox_in.count = cpu_to_le32(alloc_size); 130 mbox_in.start_idx = cpu_to_le16(start); 131 memset(mbox_out, 0, alloc_size); 132 mbox_cmd = (struct cxl_mbox_cmd) { 133 .opcode = CXL_MBOX_OP_GET_SUPPORTED_FEATURES, 134 .size_in = sizeof(mbox_in), 135 .payload_in = &mbox_in, 136 .size_out = alloc_size, 137 .payload_out = mbox_out, 138 .min_out = hdr_size, 139 }; 140 rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); 141 if (rc < 0) 142 return NULL; 143 144 if (mbox_cmd.size_out <= hdr_size) 145 return NULL; 146 147 /* 148 * Make sure retrieved out buffer is multiple of feature 149 * entries. 150 */ 151 retrieved = mbox_cmd.size_out - hdr_size; 152 if (retrieved % feat_size) 153 return NULL; 154 155 num_entries = le16_to_cpu(mbox_out->num_entries); 156 /* 157 * If the reported output entries * defined entry size != 158 * retrieved output bytes, then the output package is incorrect. 159 */ 160 if (num_entries * feat_size != retrieved) 161 return NULL; 162 163 memcpy(entry, mbox_out->ents, retrieved); 164 for (int i = 0; i < num_entries; i++) { 165 if (!is_cxl_feature_exclusive(entry + i)) 166 user_feats++; 167 } 168 entry += num_entries; 169 /* 170 * If the number of output entries is less than expected, add the 171 * remaining entries to the next batch. 172 */ 173 remain_feats += copy_feats - num_entries; 174 start += num_entries; 175 } while (remain_feats); 176 177 entries->num_features = count; 178 entries->num_user_features = user_feats; 179 180 return no_free_ptr(entries); 181 } 182 183 static void free_cxlfs(void *_cxlfs) 184 { 185 struct cxl_features_state *cxlfs = _cxlfs; 186 struct cxl_dev_state *cxlds = cxlfs->cxlds; 187 188 cxlds->cxlfs = NULL; 189 kvfree(cxlfs->entries); 190 kfree(cxlfs); 191 } 192 193 /** 194 * devm_cxl_setup_features() - Allocate and initialize features context 195 * @cxlds: CXL device context 196 * 197 * Return 0 on success or -errno on failure. 198 */ 199 int devm_cxl_setup_features(struct cxl_dev_state *cxlds) 200 { 201 struct cxl_mailbox *cxl_mbox = &cxlds->cxl_mbox; 202 203 if (cxl_mbox->feat_cap < CXL_FEATURES_RO) 204 return -ENODEV; 205 206 struct cxl_features_state *cxlfs __free(kfree) = 207 kzalloc(sizeof(*cxlfs), GFP_KERNEL); 208 if (!cxlfs) 209 return -ENOMEM; 210 211 cxlfs->cxlds = cxlds; 212 213 cxlfs->entries = get_supported_features(cxlfs); 214 if (!cxlfs->entries) 215 return -ENOMEM; 216 217 cxlds->cxlfs = cxlfs; 218 219 return devm_add_action_or_reset(cxlds->dev, free_cxlfs, no_free_ptr(cxlfs)); 220 } 221 EXPORT_SYMBOL_NS_GPL(devm_cxl_setup_features, "CXL"); 222 223 size_t cxl_get_feature(struct cxl_mailbox *cxl_mbox, const uuid_t *feat_uuid, 224 enum cxl_get_feat_selection selection, 225 void *feat_out, size_t feat_out_size, u16 offset, 226 u16 *return_code) 227 { 228 size_t data_to_rd_size, size_out; 229 struct cxl_mbox_get_feat_in pi; 230 struct cxl_mbox_cmd mbox_cmd; 231 size_t data_rcvd_size = 0; 232 int rc; 233 234 if (return_code) 235 *return_code = CXL_MBOX_CMD_RC_INPUT; 236 237 if (!feat_out || !feat_out_size) 238 return 0; 239 240 size_out = min(feat_out_size, cxl_mbox->payload_size); 241 uuid_copy(&pi.uuid, feat_uuid); 242 pi.selection = selection; 243 do { 244 data_to_rd_size = min(feat_out_size - data_rcvd_size, 245 cxl_mbox->payload_size); 246 pi.offset = cpu_to_le16(offset + data_rcvd_size); 247 pi.count = cpu_to_le16(data_to_rd_size); 248 249 mbox_cmd = (struct cxl_mbox_cmd) { 250 .opcode = CXL_MBOX_OP_GET_FEATURE, 251 .size_in = sizeof(pi), 252 .payload_in = &pi, 253 .size_out = size_out, 254 .payload_out = feat_out + data_rcvd_size, 255 .min_out = data_to_rd_size, 256 }; 257 rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); 258 if (rc < 0 || !mbox_cmd.size_out) { 259 if (return_code) 260 *return_code = mbox_cmd.return_code; 261 return 0; 262 } 263 data_rcvd_size += mbox_cmd.size_out; 264 } while (data_rcvd_size < feat_out_size); 265 266 if (return_code) 267 *return_code = CXL_MBOX_CMD_RC_SUCCESS; 268 269 return data_rcvd_size; 270 } 271 272 /* 273 * FEAT_DATA_MIN_PAYLOAD_SIZE - min extra number of bytes should be 274 * available in the mailbox for storing the actual feature data so that 275 * the feature data transfer would work as expected. 276 */ 277 #define FEAT_DATA_MIN_PAYLOAD_SIZE 10 278 int cxl_set_feature(struct cxl_mailbox *cxl_mbox, 279 const uuid_t *feat_uuid, u8 feat_version, 280 const void *feat_data, size_t feat_data_size, 281 u32 feat_flag, u16 offset, u16 *return_code) 282 { 283 size_t data_in_size, data_sent_size = 0; 284 struct cxl_mbox_cmd mbox_cmd; 285 size_t hdr_size; 286 287 if (return_code) 288 *return_code = CXL_MBOX_CMD_RC_INPUT; 289 290 struct cxl_mbox_set_feat_in *pi __free(kfree) = 291 kzalloc(cxl_mbox->payload_size, GFP_KERNEL); 292 if (!pi) 293 return -ENOMEM; 294 295 uuid_copy(&pi->uuid, feat_uuid); 296 pi->version = feat_version; 297 feat_flag &= ~CXL_SET_FEAT_FLAG_DATA_TRANSFER_MASK; 298 feat_flag |= CXL_SET_FEAT_FLAG_DATA_SAVED_ACROSS_RESET; 299 hdr_size = sizeof(pi->hdr); 300 /* 301 * Check minimum mbox payload size is available for 302 * the feature data transfer. 303 */ 304 if (hdr_size + FEAT_DATA_MIN_PAYLOAD_SIZE > cxl_mbox->payload_size) 305 return -ENOMEM; 306 307 if (hdr_size + feat_data_size <= cxl_mbox->payload_size) { 308 pi->flags = cpu_to_le32(feat_flag | 309 CXL_SET_FEAT_FLAG_FULL_DATA_TRANSFER); 310 data_in_size = feat_data_size; 311 } else { 312 pi->flags = cpu_to_le32(feat_flag | 313 CXL_SET_FEAT_FLAG_INITIATE_DATA_TRANSFER); 314 data_in_size = cxl_mbox->payload_size - hdr_size; 315 } 316 317 do { 318 int rc; 319 320 pi->offset = cpu_to_le16(offset + data_sent_size); 321 memcpy(pi->feat_data, feat_data + data_sent_size, data_in_size); 322 mbox_cmd = (struct cxl_mbox_cmd) { 323 .opcode = CXL_MBOX_OP_SET_FEATURE, 324 .size_in = hdr_size + data_in_size, 325 .payload_in = pi, 326 }; 327 rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); 328 if (rc < 0) { 329 if (return_code) 330 *return_code = mbox_cmd.return_code; 331 return rc; 332 } 333 334 data_sent_size += data_in_size; 335 if (data_sent_size >= feat_data_size) { 336 if (return_code) 337 *return_code = CXL_MBOX_CMD_RC_SUCCESS; 338 return 0; 339 } 340 341 if ((feat_data_size - data_sent_size) <= (cxl_mbox->payload_size - hdr_size)) { 342 data_in_size = feat_data_size - data_sent_size; 343 pi->flags = cpu_to_le32(feat_flag | 344 CXL_SET_FEAT_FLAG_FINISH_DATA_TRANSFER); 345 } else { 346 pi->flags = cpu_to_le32(feat_flag | 347 CXL_SET_FEAT_FLAG_CONTINUE_DATA_TRANSFER); 348 } 349 } while (true); 350 } 351 352 /* FWCTL support */ 353 354 static inline struct cxl_memdev *fwctl_to_memdev(struct fwctl_device *fwctl_dev) 355 { 356 return to_cxl_memdev(fwctl_dev->dev.parent); 357 } 358 359 static int cxlctl_open_uctx(struct fwctl_uctx *uctx) 360 { 361 return 0; 362 } 363 364 static void cxlctl_close_uctx(struct fwctl_uctx *uctx) 365 { 366 } 367 368 struct cxl_feat_entry * 369 cxl_feature_info(struct cxl_features_state *cxlfs, 370 const uuid_t *uuid) 371 { 372 struct cxl_feat_entry *feat; 373 374 if (!cxlfs || !cxlfs->entries) 375 return ERR_PTR(-EOPNOTSUPP); 376 377 for (int i = 0; i < cxlfs->entries->num_features; i++) { 378 feat = &cxlfs->entries->ent[i]; 379 if (uuid_equal(uuid, &feat->uuid)) 380 return feat; 381 } 382 383 return ERR_PTR(-EINVAL); 384 } 385 386 static void *cxlctl_get_supported_features(struct cxl_features_state *cxlfs, 387 const struct fwctl_rpc_cxl *rpc_in, 388 size_t *out_len) 389 { 390 const struct cxl_mbox_get_sup_feats_in *feat_in; 391 struct cxl_mbox_get_sup_feats_out *feat_out; 392 struct cxl_feat_entry *pos; 393 size_t out_size; 394 int requested; 395 u32 count; 396 u16 start; 397 int i; 398 399 if (rpc_in->op_size != sizeof(*feat_in)) 400 return ERR_PTR(-EINVAL); 401 402 feat_in = &rpc_in->get_sup_feats_in; 403 count = le32_to_cpu(feat_in->count); 404 start = le16_to_cpu(feat_in->start_idx); 405 requested = count / sizeof(*pos); 406 407 /* 408 * Make sure that the total requested number of entries is not greater 409 * than the total number of supported features allowed for userspace. 410 */ 411 if (start >= cxlfs->entries->num_features) 412 return ERR_PTR(-EINVAL); 413 414 requested = min_t(int, requested, cxlfs->entries->num_features - start); 415 416 out_size = sizeof(struct fwctl_rpc_cxl_out) + 417 struct_size(feat_out, ents, requested); 418 419 struct fwctl_rpc_cxl_out *rpc_out __free(kvfree) = 420 kvzalloc(out_size, GFP_KERNEL); 421 if (!rpc_out) 422 return ERR_PTR(-ENOMEM); 423 424 rpc_out->size = struct_size(feat_out, ents, requested); 425 feat_out = &rpc_out->get_sup_feats_out; 426 427 for (i = start, pos = &feat_out->ents[0]; 428 i < cxlfs->entries->num_features; i++, pos++) { 429 if (i - start == requested) 430 break; 431 432 memcpy(pos, &cxlfs->entries->ent[i], sizeof(*pos)); 433 /* 434 * If the feature is exclusive, set the set_feat_size to 0 to 435 * indicate that the feature is not changeable. 436 */ 437 if (is_cxl_feature_exclusive(pos)) { 438 u32 flags; 439 440 pos->set_feat_size = 0; 441 flags = le32_to_cpu(pos->flags); 442 flags &= ~CXL_FEATURE_F_CHANGEABLE; 443 pos->flags = cpu_to_le32(flags); 444 } 445 } 446 447 feat_out->num_entries = cpu_to_le16(requested); 448 feat_out->supported_feats = cpu_to_le16(cxlfs->entries->num_features); 449 rpc_out->retval = CXL_MBOX_CMD_RC_SUCCESS; 450 *out_len = out_size; 451 452 return no_free_ptr(rpc_out); 453 } 454 455 static void *cxlctl_get_feature(struct cxl_features_state *cxlfs, 456 const struct fwctl_rpc_cxl *rpc_in, 457 size_t *out_len) 458 { 459 struct cxl_mailbox *cxl_mbox = &cxlfs->cxlds->cxl_mbox; 460 const struct cxl_mbox_get_feat_in *feat_in; 461 u16 offset, count, return_code; 462 size_t out_size = *out_len; 463 464 if (rpc_in->op_size != sizeof(*feat_in)) 465 return ERR_PTR(-EINVAL); 466 467 feat_in = &rpc_in->get_feat_in; 468 offset = le16_to_cpu(feat_in->offset); 469 count = le16_to_cpu(feat_in->count); 470 471 if (!count) 472 return ERR_PTR(-EINVAL); 473 474 struct fwctl_rpc_cxl_out *rpc_out __free(kvfree) = 475 kvzalloc(out_size, GFP_KERNEL); 476 if (!rpc_out) 477 return ERR_PTR(-ENOMEM); 478 479 out_size = cxl_get_feature(cxl_mbox, &feat_in->uuid, 480 feat_in->selection, rpc_out->payload, 481 count, offset, &return_code); 482 *out_len = sizeof(struct fwctl_rpc_cxl_out); 483 if (!out_size) { 484 rpc_out->size = 0; 485 rpc_out->retval = return_code; 486 return no_free_ptr(rpc_out); 487 } 488 489 rpc_out->size = out_size; 490 rpc_out->retval = CXL_MBOX_CMD_RC_SUCCESS; 491 *out_len += out_size; 492 493 return no_free_ptr(rpc_out); 494 } 495 496 static void *cxlctl_set_feature(struct cxl_features_state *cxlfs, 497 const struct fwctl_rpc_cxl *rpc_in, 498 size_t *out_len) 499 { 500 struct cxl_mailbox *cxl_mbox = &cxlfs->cxlds->cxl_mbox; 501 const struct cxl_mbox_set_feat_in *feat_in; 502 size_t out_size, data_size; 503 u16 offset, return_code; 504 u32 flags; 505 int rc; 506 507 if (rpc_in->op_size <= sizeof(feat_in->hdr)) 508 return ERR_PTR(-EINVAL); 509 510 feat_in = &rpc_in->set_feat_in; 511 512 if (is_cxl_feature_exclusive_by_uuid(&feat_in->uuid)) 513 return ERR_PTR(-EPERM); 514 515 offset = le16_to_cpu(feat_in->offset); 516 flags = le32_to_cpu(feat_in->flags); 517 out_size = *out_len; 518 519 struct fwctl_rpc_cxl_out *rpc_out __free(kvfree) = 520 kvzalloc(out_size, GFP_KERNEL); 521 if (!rpc_out) 522 return ERR_PTR(-ENOMEM); 523 524 rpc_out->size = 0; 525 526 data_size = rpc_in->op_size - sizeof(feat_in->hdr); 527 rc = cxl_set_feature(cxl_mbox, &feat_in->uuid, 528 feat_in->version, feat_in->feat_data, 529 data_size, flags, offset, &return_code); 530 *out_len = sizeof(*rpc_out); 531 if (rc) { 532 rpc_out->retval = return_code; 533 return no_free_ptr(rpc_out); 534 } 535 536 rpc_out->retval = CXL_MBOX_CMD_RC_SUCCESS; 537 538 return no_free_ptr(rpc_out); 539 } 540 541 static bool cxlctl_validate_set_features(struct cxl_features_state *cxlfs, 542 const struct fwctl_rpc_cxl *rpc_in, 543 enum fwctl_rpc_scope scope) 544 { 545 u16 effects, imm_mask, reset_mask; 546 struct cxl_feat_entry *feat; 547 u32 flags; 548 549 if (rpc_in->op_size < sizeof(uuid_t)) 550 return false; 551 552 feat = cxl_feature_info(cxlfs, &rpc_in->set_feat_in.uuid); 553 if (IS_ERR(feat)) 554 return false; 555 556 /* Ensure that the attribute is changeable */ 557 flags = le32_to_cpu(feat->flags); 558 if (!(flags & CXL_FEATURE_F_CHANGEABLE)) 559 return false; 560 561 effects = le16_to_cpu(feat->effects); 562 563 /* 564 * Reserved bits are set, rejecting since the effects is not 565 * comprehended by the driver. 566 */ 567 if (effects & CXL_CMD_EFFECTS_RESERVED) { 568 dev_warn_once(cxlfs->cxlds->dev, 569 "Reserved bits set in the Feature effects field!\n"); 570 return false; 571 } 572 573 /* Currently no user background command support */ 574 if (effects & CXL_CMD_BACKGROUND) 575 return false; 576 577 /* Effects cause immediate change, highest security scope is needed */ 578 imm_mask = CXL_CMD_CONFIG_CHANGE_IMMEDIATE | 579 CXL_CMD_DATA_CHANGE_IMMEDIATE | 580 CXL_CMD_POLICY_CHANGE_IMMEDIATE | 581 CXL_CMD_LOG_CHANGE_IMMEDIATE; 582 583 reset_mask = CXL_CMD_CONFIG_CHANGE_COLD_RESET | 584 CXL_CMD_CONFIG_CHANGE_CONV_RESET | 585 CXL_CMD_CONFIG_CHANGE_CXL_RESET; 586 587 /* If no immediate or reset effect set, The hardware has a bug */ 588 if (!(effects & imm_mask) && !(effects & reset_mask)) 589 return false; 590 591 /* 592 * If the Feature setting causes immediate configuration change 593 * then we need the full write permission policy. 594 */ 595 if (effects & imm_mask && scope >= FWCTL_RPC_DEBUG_WRITE_FULL) 596 return true; 597 598 /* 599 * If the Feature setting only causes configuration change 600 * after a reset, then the lesser level of write permission 601 * policy is ok. 602 */ 603 if (!(effects & imm_mask) && scope >= FWCTL_RPC_DEBUG_WRITE) 604 return true; 605 606 return false; 607 } 608 609 static bool cxlctl_validate_hw_command(struct cxl_features_state *cxlfs, 610 const struct fwctl_rpc_cxl *rpc_in, 611 enum fwctl_rpc_scope scope, 612 u16 opcode) 613 { 614 struct cxl_mailbox *cxl_mbox = &cxlfs->cxlds->cxl_mbox; 615 616 switch (opcode) { 617 case CXL_MBOX_OP_GET_SUPPORTED_FEATURES: 618 case CXL_MBOX_OP_GET_FEATURE: 619 return cxl_mbox->feat_cap >= CXL_FEATURES_RO; 620 case CXL_MBOX_OP_SET_FEATURE: 621 if (cxl_mbox->feat_cap < CXL_FEATURES_RW) 622 return false; 623 return cxlctl_validate_set_features(cxlfs, rpc_in, scope); 624 default: 625 return false; 626 } 627 } 628 629 static void *cxlctl_handle_commands(struct cxl_features_state *cxlfs, 630 const struct fwctl_rpc_cxl *rpc_in, 631 size_t *out_len, u16 opcode) 632 { 633 switch (opcode) { 634 case CXL_MBOX_OP_GET_SUPPORTED_FEATURES: 635 return cxlctl_get_supported_features(cxlfs, rpc_in, out_len); 636 case CXL_MBOX_OP_GET_FEATURE: 637 return cxlctl_get_feature(cxlfs, rpc_in, out_len); 638 case CXL_MBOX_OP_SET_FEATURE: 639 return cxlctl_set_feature(cxlfs, rpc_in, out_len); 640 default: 641 return ERR_PTR(-EOPNOTSUPP); 642 } 643 } 644 645 static void *cxlctl_fw_rpc(struct fwctl_uctx *uctx, enum fwctl_rpc_scope scope, 646 void *in, size_t in_len, size_t *out_len) 647 { 648 struct fwctl_device *fwctl_dev = uctx->fwctl; 649 struct cxl_memdev *cxlmd = fwctl_to_memdev(fwctl_dev); 650 struct cxl_features_state *cxlfs = to_cxlfs(cxlmd->cxlds); 651 const struct fwctl_rpc_cxl *rpc_in = in; 652 u16 opcode = rpc_in->opcode; 653 654 if (!cxlctl_validate_hw_command(cxlfs, rpc_in, scope, opcode)) 655 return ERR_PTR(-EINVAL); 656 657 return cxlctl_handle_commands(cxlfs, rpc_in, out_len, opcode); 658 } 659 660 static const struct fwctl_ops cxlctl_ops = { 661 .device_type = FWCTL_DEVICE_TYPE_CXL, 662 .uctx_size = sizeof(struct fwctl_uctx), 663 .open_uctx = cxlctl_open_uctx, 664 .close_uctx = cxlctl_close_uctx, 665 .fw_rpc = cxlctl_fw_rpc, 666 }; 667 668 DEFINE_FREE(free_fwctl_dev, struct fwctl_device *, if (_T) fwctl_put(_T)) 669 670 static void free_memdev_fwctl(void *_fwctl_dev) 671 { 672 struct fwctl_device *fwctl_dev = _fwctl_dev; 673 674 fwctl_unregister(fwctl_dev); 675 fwctl_put(fwctl_dev); 676 } 677 678 int devm_cxl_setup_fwctl(struct device *host, struct cxl_memdev *cxlmd) 679 { 680 struct cxl_dev_state *cxlds = cxlmd->cxlds; 681 struct cxl_features_state *cxlfs; 682 int rc; 683 684 cxlfs = to_cxlfs(cxlds); 685 if (!cxlfs) 686 return -ENODEV; 687 688 /* No need to setup FWCTL if there are no user allowed features found */ 689 if (!cxlfs->entries->num_user_features) 690 return -ENODEV; 691 692 struct fwctl_device *fwctl_dev __free(free_fwctl_dev) = 693 _fwctl_alloc_device(&cxlmd->dev, &cxlctl_ops, sizeof(*fwctl_dev)); 694 if (!fwctl_dev) 695 return -ENOMEM; 696 697 rc = fwctl_register(fwctl_dev); 698 if (rc) 699 return rc; 700 701 return devm_add_action_or_reset(host, free_memdev_fwctl, 702 no_free_ptr(fwctl_dev)); 703 } 704 EXPORT_SYMBOL_NS_GPL(devm_cxl_setup_fwctl, "CXL"); 705 706 MODULE_IMPORT_NS("FWCTL"); 707