1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * System Control and Management Interface (SCMI) Powercap Protocol 4 * 5 * Copyright (C) 2022 ARM Ltd. 6 */ 7 8 #define pr_fmt(fmt) "SCMI Notifications POWERCAP - " fmt 9 10 #include <linux/bitfield.h> 11 #include <linux/io.h> 12 #include <linux/module.h> 13 #include <linux/scmi_protocol.h> 14 15 #include <trace/events/scmi.h> 16 17 #include "protocols.h" 18 #include "notify.h" 19 20 /* Updated only after ALL the mandatory features for that version are merged */ 21 #define SCMI_PROTOCOL_SUPPORTED_VERSION 0x20000 22 23 enum scmi_powercap_protocol_cmd { 24 POWERCAP_DOMAIN_ATTRIBUTES = 0x3, 25 POWERCAP_CAP_GET = 0x4, 26 POWERCAP_CAP_SET = 0x5, 27 POWERCAP_PAI_GET = 0x6, 28 POWERCAP_PAI_SET = 0x7, 29 POWERCAP_DOMAIN_NAME_GET = 0x8, 30 POWERCAP_MEASUREMENTS_GET = 0x9, 31 POWERCAP_CAP_NOTIFY = 0xa, 32 POWERCAP_MEASUREMENTS_NOTIFY = 0xb, 33 POWERCAP_DESCRIBE_FASTCHANNEL = 0xc, 34 }; 35 36 enum { 37 POWERCAP_FC_CAP, 38 POWERCAP_FC_PAI, 39 POWERCAP_FC_MAX, 40 }; 41 42 struct scmi_msg_resp_powercap_domain_attributes { 43 __le32 attributes; 44 #define SUPPORTS_POWERCAP_CAP_CHANGE_NOTIFY(x) ((x) & BIT(31)) 45 #define SUPPORTS_POWERCAP_MEASUREMENTS_CHANGE_NOTIFY(x) ((x) & BIT(30)) 46 #define SUPPORTS_ASYNC_POWERCAP_CAP_SET(x) ((x) & BIT(29)) 47 #define SUPPORTS_EXTENDED_NAMES(x) ((x) & BIT(28)) 48 #define SUPPORTS_POWERCAP_CAP_CONFIGURATION(x) ((x) & BIT(27)) 49 #define SUPPORTS_POWERCAP_MONITORING(x) ((x) & BIT(26)) 50 #define SUPPORTS_POWERCAP_PAI_CONFIGURATION(x) ((x) & BIT(25)) 51 #define SUPPORTS_POWERCAP_FASTCHANNELS(x) ((x) & BIT(22)) 52 #define POWERCAP_POWER_UNIT(x) \ 53 (FIELD_GET(GENMASK(24, 23), (x))) 54 #define SUPPORTS_POWER_UNITS_MW(x) \ 55 (POWERCAP_POWER_UNIT(x) == 0x2) 56 #define SUPPORTS_POWER_UNITS_UW(x) \ 57 (POWERCAP_POWER_UNIT(x) == 0x1) 58 u8 name[SCMI_SHORT_NAME_MAX_SIZE]; 59 __le32 min_pai; 60 __le32 max_pai; 61 __le32 pai_step; 62 __le32 min_power_cap; 63 __le32 max_power_cap; 64 __le32 power_cap_step; 65 __le32 sustainable_power; 66 __le32 accuracy; 67 __le32 parent_id; 68 }; 69 70 struct scmi_msg_powercap_set_cap_or_pai { 71 __le32 domain; 72 __le32 flags; 73 #define CAP_SET_ASYNC BIT(1) 74 #define CAP_SET_IGNORE_DRESP BIT(0) 75 __le32 value; 76 }; 77 78 struct scmi_msg_resp_powercap_cap_set_complete { 79 __le32 domain; 80 __le32 power_cap; 81 }; 82 83 struct scmi_msg_resp_powercap_meas_get { 84 __le32 power; 85 __le32 pai; 86 }; 87 88 struct scmi_msg_powercap_notify_cap { 89 __le32 domain; 90 __le32 notify_enable; 91 }; 92 93 struct scmi_msg_powercap_notify_thresh { 94 __le32 domain; 95 __le32 notify_enable; 96 __le32 power_thresh_low; 97 __le32 power_thresh_high; 98 }; 99 100 struct scmi_powercap_cap_changed_notify_payld { 101 __le32 agent_id; 102 __le32 domain_id; 103 __le32 power_cap; 104 __le32 pai; 105 }; 106 107 struct scmi_powercap_meas_changed_notify_payld { 108 __le32 agent_id; 109 __le32 domain_id; 110 __le32 power; 111 }; 112 113 struct scmi_powercap_state { 114 bool enabled; 115 u32 last_pcap; 116 bool meas_notif_enabled; 117 u64 thresholds; 118 #define THRESH_LOW(p, id) \ 119 (lower_32_bits((p)->states[(id)].thresholds)) 120 #define THRESH_HIGH(p, id) \ 121 (upper_32_bits((p)->states[(id)].thresholds)) 122 }; 123 124 struct powercap_info { 125 int num_domains; 126 bool notify_cap_cmd; 127 bool notify_measurements_cmd; 128 struct scmi_powercap_state *states; 129 struct scmi_powercap_info *powercaps; 130 }; 131 132 static enum scmi_powercap_protocol_cmd evt_2_cmd[] = { 133 POWERCAP_CAP_NOTIFY, 134 POWERCAP_MEASUREMENTS_NOTIFY, 135 }; 136 137 static int scmi_powercap_notify(const struct scmi_protocol_handle *ph, 138 u32 domain, int message_id, bool enable); 139 140 static int 141 scmi_powercap_attributes_get(const struct scmi_protocol_handle *ph, 142 struct powercap_info *pi) 143 { 144 int ret; 145 struct scmi_xfer *t; 146 147 ret = ph->xops->xfer_get_init(ph, PROTOCOL_ATTRIBUTES, 0, 148 sizeof(u32), &t); 149 if (ret) 150 return ret; 151 152 ret = ph->xops->do_xfer(ph, t); 153 if (!ret) { 154 u32 attributes; 155 156 attributes = get_unaligned_le32(t->rx.buf); 157 pi->num_domains = FIELD_GET(GENMASK(15, 0), attributes); 158 } 159 160 ph->xops->xfer_put(ph, t); 161 162 if (!ret) { 163 if (!ph->hops->protocol_msg_check(ph, 164 POWERCAP_CAP_NOTIFY, NULL)) 165 pi->notify_cap_cmd = true; 166 167 if (!ph->hops->protocol_msg_check(ph, 168 POWERCAP_MEASUREMENTS_NOTIFY, 169 NULL)) 170 pi->notify_measurements_cmd = true; 171 } 172 173 return ret; 174 } 175 176 static inline int 177 scmi_powercap_validate(unsigned int min_val, unsigned int max_val, 178 unsigned int step_val, bool configurable) 179 { 180 if (!min_val || !max_val) 181 return -EPROTO; 182 183 if ((configurable && min_val == max_val) || 184 (!configurable && min_val != max_val)) 185 return -EPROTO; 186 187 if (min_val != max_val && !step_val) 188 return -EPROTO; 189 190 return 0; 191 } 192 193 static int 194 scmi_powercap_domain_attributes_get(const struct scmi_protocol_handle *ph, 195 struct powercap_info *pinfo, u32 domain) 196 { 197 int ret; 198 u32 flags; 199 struct scmi_xfer *t; 200 struct scmi_powercap_info *dom_info = pinfo->powercaps + domain; 201 struct scmi_msg_resp_powercap_domain_attributes *resp; 202 203 ret = ph->xops->xfer_get_init(ph, POWERCAP_DOMAIN_ATTRIBUTES, 204 sizeof(domain), sizeof(*resp), &t); 205 if (ret) 206 return ret; 207 208 put_unaligned_le32(domain, t->tx.buf); 209 resp = t->rx.buf; 210 211 ret = ph->xops->do_xfer(ph, t); 212 if (!ret) { 213 flags = le32_to_cpu(resp->attributes); 214 215 dom_info->id = domain; 216 if (pinfo->notify_cap_cmd) 217 dom_info->notify_powercap_cap_change = 218 SUPPORTS_POWERCAP_CAP_CHANGE_NOTIFY(flags); 219 if (pinfo->notify_measurements_cmd) 220 dom_info->notify_powercap_measurement_change = 221 SUPPORTS_POWERCAP_MEASUREMENTS_CHANGE_NOTIFY(flags); 222 dom_info->async_powercap_cap_set = 223 SUPPORTS_ASYNC_POWERCAP_CAP_SET(flags); 224 dom_info->powercap_cap_config = 225 SUPPORTS_POWERCAP_CAP_CONFIGURATION(flags); 226 dom_info->powercap_monitoring = 227 SUPPORTS_POWERCAP_MONITORING(flags); 228 dom_info->powercap_pai_config = 229 SUPPORTS_POWERCAP_PAI_CONFIGURATION(flags); 230 dom_info->powercap_scale_mw = 231 SUPPORTS_POWER_UNITS_MW(flags); 232 dom_info->powercap_scale_uw = 233 SUPPORTS_POWER_UNITS_UW(flags); 234 dom_info->fastchannels = 235 SUPPORTS_POWERCAP_FASTCHANNELS(flags); 236 237 strscpy(dom_info->name, resp->name, SCMI_SHORT_NAME_MAX_SIZE); 238 239 dom_info->min_pai = le32_to_cpu(resp->min_pai); 240 dom_info->max_pai = le32_to_cpu(resp->max_pai); 241 dom_info->pai_step = le32_to_cpu(resp->pai_step); 242 ret = scmi_powercap_validate(dom_info->min_pai, 243 dom_info->max_pai, 244 dom_info->pai_step, 245 dom_info->powercap_pai_config); 246 if (ret) { 247 dev_err(ph->dev, 248 "Platform reported inconsistent PAI config for domain %d - %s\n", 249 dom_info->id, dom_info->name); 250 goto clean; 251 } 252 253 dom_info->min_power_cap = le32_to_cpu(resp->min_power_cap); 254 dom_info->max_power_cap = le32_to_cpu(resp->max_power_cap); 255 dom_info->power_cap_step = le32_to_cpu(resp->power_cap_step); 256 ret = scmi_powercap_validate(dom_info->min_power_cap, 257 dom_info->max_power_cap, 258 dom_info->power_cap_step, 259 dom_info->powercap_cap_config); 260 if (ret) { 261 dev_err(ph->dev, 262 "Platform reported inconsistent CAP config for domain %d - %s\n", 263 dom_info->id, dom_info->name); 264 goto clean; 265 } 266 267 dom_info->sustainable_power = 268 le32_to_cpu(resp->sustainable_power); 269 dom_info->accuracy = le32_to_cpu(resp->accuracy); 270 271 dom_info->parent_id = le32_to_cpu(resp->parent_id); 272 if (dom_info->parent_id != SCMI_POWERCAP_ROOT_ZONE_ID && 273 (dom_info->parent_id >= pinfo->num_domains || 274 dom_info->parent_id == dom_info->id)) { 275 dev_err(ph->dev, 276 "Platform reported inconsistent parent ID for domain %d - %s\n", 277 dom_info->id, dom_info->name); 278 ret = -ENODEV; 279 } 280 } 281 282 clean: 283 ph->xops->xfer_put(ph, t); 284 285 /* 286 * If supported overwrite short name with the extended one; 287 * on error just carry on and use already provided short name. 288 */ 289 if (!ret && SUPPORTS_EXTENDED_NAMES(flags)) 290 ph->hops->extended_name_get(ph, POWERCAP_DOMAIN_NAME_GET, 291 domain, NULL, dom_info->name, 292 SCMI_MAX_STR_SIZE); 293 294 return ret; 295 } 296 297 static int scmi_powercap_num_domains_get(const struct scmi_protocol_handle *ph) 298 { 299 struct powercap_info *pi = ph->get_priv(ph); 300 301 return pi->num_domains; 302 } 303 304 static const struct scmi_powercap_info * 305 scmi_powercap_dom_info_get(const struct scmi_protocol_handle *ph, u32 domain_id) 306 { 307 struct powercap_info *pi = ph->get_priv(ph); 308 309 if (domain_id >= pi->num_domains) 310 return NULL; 311 312 return pi->powercaps + domain_id; 313 } 314 315 static int scmi_powercap_xfer_cap_get(const struct scmi_protocol_handle *ph, 316 u32 domain_id, u32 *power_cap) 317 { 318 int ret; 319 struct scmi_xfer *t; 320 321 ret = ph->xops->xfer_get_init(ph, POWERCAP_CAP_GET, sizeof(u32), 322 sizeof(u32), &t); 323 if (ret) 324 return ret; 325 326 put_unaligned_le32(domain_id, t->tx.buf); 327 ret = ph->xops->do_xfer(ph, t); 328 if (!ret) 329 *power_cap = get_unaligned_le32(t->rx.buf); 330 331 ph->xops->xfer_put(ph, t); 332 333 return ret; 334 } 335 336 static int __scmi_powercap_cap_get(const struct scmi_protocol_handle *ph, 337 const struct scmi_powercap_info *dom, 338 u32 *power_cap) 339 { 340 if (dom->fc_info && dom->fc_info[POWERCAP_FC_CAP].get_addr) { 341 *power_cap = ioread32(dom->fc_info[POWERCAP_FC_CAP].get_addr); 342 trace_scmi_fc_call(SCMI_PROTOCOL_POWERCAP, POWERCAP_CAP_GET, 343 dom->id, *power_cap, 0); 344 return 0; 345 } 346 347 return scmi_powercap_xfer_cap_get(ph, dom->id, power_cap); 348 } 349 350 static int scmi_powercap_cap_get(const struct scmi_protocol_handle *ph, 351 u32 domain_id, u32 *power_cap) 352 { 353 const struct scmi_powercap_info *dom; 354 355 if (!power_cap) 356 return -EINVAL; 357 358 dom = scmi_powercap_dom_info_get(ph, domain_id); 359 if (!dom) 360 return -EINVAL; 361 362 return __scmi_powercap_cap_get(ph, dom, power_cap); 363 } 364 365 static int scmi_powercap_xfer_cap_set(const struct scmi_protocol_handle *ph, 366 const struct scmi_powercap_info *pc, 367 u32 power_cap, bool ignore_dresp) 368 { 369 int ret; 370 struct scmi_xfer *t; 371 struct scmi_msg_powercap_set_cap_or_pai *msg; 372 373 ret = ph->xops->xfer_get_init(ph, POWERCAP_CAP_SET, 374 sizeof(*msg), 0, &t); 375 if (ret) 376 return ret; 377 378 msg = t->tx.buf; 379 msg->domain = cpu_to_le32(pc->id); 380 msg->flags = 381 cpu_to_le32(FIELD_PREP(CAP_SET_ASYNC, pc->async_powercap_cap_set) | 382 FIELD_PREP(CAP_SET_IGNORE_DRESP, ignore_dresp)); 383 msg->value = cpu_to_le32(power_cap); 384 385 if (!pc->async_powercap_cap_set || ignore_dresp) { 386 ret = ph->xops->do_xfer(ph, t); 387 } else { 388 ret = ph->xops->do_xfer_with_response(ph, t); 389 if (!ret) { 390 struct scmi_msg_resp_powercap_cap_set_complete *resp; 391 392 resp = t->rx.buf; 393 if (le32_to_cpu(resp->domain) == pc->id) 394 dev_dbg(ph->dev, 395 "Powercap ID %d CAP set async to %u\n", 396 pc->id, 397 get_unaligned_le32(&resp->power_cap)); 398 else 399 ret = -EPROTO; 400 } 401 } 402 403 ph->xops->xfer_put(ph, t); 404 return ret; 405 } 406 407 static int __scmi_powercap_cap_set(const struct scmi_protocol_handle *ph, 408 struct powercap_info *pi, u32 domain_id, 409 u32 power_cap, bool ignore_dresp) 410 { 411 int ret = -EINVAL; 412 const struct scmi_powercap_info *pc; 413 414 pc = scmi_powercap_dom_info_get(ph, domain_id); 415 if (!pc || !pc->powercap_cap_config) 416 return ret; 417 418 if (power_cap && 419 (power_cap < pc->min_power_cap || power_cap > pc->max_power_cap)) 420 return ret; 421 422 if (pc->fc_info && pc->fc_info[POWERCAP_FC_CAP].set_addr) { 423 struct scmi_fc_info *fci = &pc->fc_info[POWERCAP_FC_CAP]; 424 425 iowrite32(power_cap, fci->set_addr); 426 ph->hops->fastchannel_db_ring(fci->set_db); 427 trace_scmi_fc_call(SCMI_PROTOCOL_POWERCAP, POWERCAP_CAP_SET, 428 domain_id, power_cap, 0); 429 ret = 0; 430 } else { 431 ret = scmi_powercap_xfer_cap_set(ph, pc, power_cap, 432 ignore_dresp); 433 } 434 435 /* Save the last explicitly set non-zero powercap value */ 436 if (PROTOCOL_REV_MAJOR(ph->version) >= 0x2 && !ret && power_cap) 437 pi->states[domain_id].last_pcap = power_cap; 438 439 return ret; 440 } 441 442 static int scmi_powercap_cap_set(const struct scmi_protocol_handle *ph, 443 u32 domain_id, u32 power_cap, 444 bool ignore_dresp) 445 { 446 struct powercap_info *pi = ph->get_priv(ph); 447 448 /* 449 * Disallow zero as a possible explicitly requested powercap: 450 * there are enable/disable operations for this. 451 */ 452 if (!power_cap) 453 return -EINVAL; 454 455 /* Just log the last set request if acting on a disabled domain */ 456 if (PROTOCOL_REV_MAJOR(ph->version) >= 0x2 && 457 !pi->states[domain_id].enabled) { 458 pi->states[domain_id].last_pcap = power_cap; 459 return 0; 460 } 461 462 return __scmi_powercap_cap_set(ph, pi, domain_id, 463 power_cap, ignore_dresp); 464 } 465 466 static int scmi_powercap_xfer_pai_get(const struct scmi_protocol_handle *ph, 467 u32 domain_id, u32 *pai) 468 { 469 int ret; 470 struct scmi_xfer *t; 471 472 ret = ph->xops->xfer_get_init(ph, POWERCAP_PAI_GET, sizeof(u32), 473 sizeof(u32), &t); 474 if (ret) 475 return ret; 476 477 put_unaligned_le32(domain_id, t->tx.buf); 478 ret = ph->xops->do_xfer(ph, t); 479 if (!ret) 480 *pai = get_unaligned_le32(t->rx.buf); 481 482 ph->xops->xfer_put(ph, t); 483 484 return ret; 485 } 486 487 static int scmi_powercap_pai_get(const struct scmi_protocol_handle *ph, 488 u32 domain_id, u32 *pai) 489 { 490 struct scmi_powercap_info *dom; 491 struct powercap_info *pi = ph->get_priv(ph); 492 493 if (!pai || domain_id >= pi->num_domains) 494 return -EINVAL; 495 496 dom = pi->powercaps + domain_id; 497 if (dom->fc_info && dom->fc_info[POWERCAP_FC_PAI].get_addr) { 498 *pai = ioread32(dom->fc_info[POWERCAP_FC_PAI].get_addr); 499 trace_scmi_fc_call(SCMI_PROTOCOL_POWERCAP, POWERCAP_PAI_GET, 500 domain_id, *pai, 0); 501 return 0; 502 } 503 504 return scmi_powercap_xfer_pai_get(ph, domain_id, pai); 505 } 506 507 static int scmi_powercap_xfer_pai_set(const struct scmi_protocol_handle *ph, 508 u32 domain_id, u32 pai) 509 { 510 int ret; 511 struct scmi_xfer *t; 512 struct scmi_msg_powercap_set_cap_or_pai *msg; 513 514 ret = ph->xops->xfer_get_init(ph, POWERCAP_PAI_SET, 515 sizeof(*msg), 0, &t); 516 if (ret) 517 return ret; 518 519 msg = t->tx.buf; 520 msg->domain = cpu_to_le32(domain_id); 521 msg->flags = cpu_to_le32(0); 522 msg->value = cpu_to_le32(pai); 523 524 ret = ph->xops->do_xfer(ph, t); 525 526 ph->xops->xfer_put(ph, t); 527 return ret; 528 } 529 530 static int scmi_powercap_pai_set(const struct scmi_protocol_handle *ph, 531 u32 domain_id, u32 pai) 532 { 533 const struct scmi_powercap_info *pc; 534 535 pc = scmi_powercap_dom_info_get(ph, domain_id); 536 if (!pc || !pc->powercap_pai_config || !pai || 537 pai < pc->min_pai || pai > pc->max_pai) 538 return -EINVAL; 539 540 if (pc->fc_info && pc->fc_info[POWERCAP_FC_PAI].set_addr) { 541 struct scmi_fc_info *fci = &pc->fc_info[POWERCAP_FC_PAI]; 542 543 trace_scmi_fc_call(SCMI_PROTOCOL_POWERCAP, POWERCAP_PAI_SET, 544 domain_id, pai, 0); 545 iowrite32(pai, fci->set_addr); 546 ph->hops->fastchannel_db_ring(fci->set_db); 547 return 0; 548 } 549 550 return scmi_powercap_xfer_pai_set(ph, domain_id, pai); 551 } 552 553 static int scmi_powercap_measurements_get(const struct scmi_protocol_handle *ph, 554 u32 domain_id, u32 *average_power, 555 u32 *pai) 556 { 557 int ret; 558 struct scmi_xfer *t; 559 struct scmi_msg_resp_powercap_meas_get *resp; 560 const struct scmi_powercap_info *pc; 561 562 pc = scmi_powercap_dom_info_get(ph, domain_id); 563 if (!pc || !pc->powercap_monitoring || !pai || !average_power) 564 return -EINVAL; 565 566 ret = ph->xops->xfer_get_init(ph, POWERCAP_MEASUREMENTS_GET, 567 sizeof(u32), sizeof(*resp), &t); 568 if (ret) 569 return ret; 570 571 resp = t->rx.buf; 572 put_unaligned_le32(domain_id, t->tx.buf); 573 ret = ph->xops->do_xfer(ph, t); 574 if (!ret) { 575 *average_power = le32_to_cpu(resp->power); 576 *pai = le32_to_cpu(resp->pai); 577 } 578 579 ph->xops->xfer_put(ph, t); 580 return ret; 581 } 582 583 static int 584 scmi_powercap_measurements_threshold_get(const struct scmi_protocol_handle *ph, 585 u32 domain_id, u32 *power_thresh_low, 586 u32 *power_thresh_high) 587 { 588 struct powercap_info *pi = ph->get_priv(ph); 589 590 if (!power_thresh_low || !power_thresh_high || 591 domain_id >= pi->num_domains) 592 return -EINVAL; 593 594 *power_thresh_low = THRESH_LOW(pi, domain_id); 595 *power_thresh_high = THRESH_HIGH(pi, domain_id); 596 597 return 0; 598 } 599 600 static int 601 scmi_powercap_measurements_threshold_set(const struct scmi_protocol_handle *ph, 602 u32 domain_id, u32 power_thresh_low, 603 u32 power_thresh_high) 604 { 605 int ret = 0; 606 struct powercap_info *pi = ph->get_priv(ph); 607 608 if (domain_id >= pi->num_domains || 609 power_thresh_low > power_thresh_high) 610 return -EINVAL; 611 612 /* Anything to do ? */ 613 if (THRESH_LOW(pi, domain_id) == power_thresh_low && 614 THRESH_HIGH(pi, domain_id) == power_thresh_high) 615 return ret; 616 617 pi->states[domain_id].thresholds = 618 (FIELD_PREP(GENMASK_ULL(31, 0), power_thresh_low) | 619 FIELD_PREP(GENMASK_ULL(63, 32), power_thresh_high)); 620 621 /* Update thresholds if notification already enabled */ 622 if (pi->states[domain_id].meas_notif_enabled) 623 ret = scmi_powercap_notify(ph, domain_id, 624 POWERCAP_MEASUREMENTS_NOTIFY, 625 true); 626 627 return ret; 628 } 629 630 static int scmi_powercap_cap_enable_set(const struct scmi_protocol_handle *ph, 631 u32 domain_id, bool enable) 632 { 633 int ret; 634 u32 power_cap; 635 struct powercap_info *pi = ph->get_priv(ph); 636 637 if (PROTOCOL_REV_MAJOR(ph->version) < 0x2) 638 return -EINVAL; 639 640 if (enable == pi->states[domain_id].enabled) 641 return 0; 642 643 if (enable) { 644 /* Cannot enable with a zero powercap. */ 645 if (!pi->states[domain_id].last_pcap) 646 return -EINVAL; 647 648 ret = __scmi_powercap_cap_set(ph, pi, domain_id, 649 pi->states[domain_id].last_pcap, 650 true); 651 } else { 652 ret = __scmi_powercap_cap_set(ph, pi, domain_id, 0, true); 653 } 654 655 if (ret) 656 return ret; 657 658 /* 659 * Update our internal state to reflect final platform state: the SCMI 660 * server could have ignored a disable request and kept enforcing some 661 * powercap limit requested by other agents. 662 */ 663 ret = scmi_powercap_cap_get(ph, domain_id, &power_cap); 664 if (!ret) 665 pi->states[domain_id].enabled = !!power_cap; 666 667 return ret; 668 } 669 670 static int scmi_powercap_cap_enable_get(const struct scmi_protocol_handle *ph, 671 u32 domain_id, bool *enable) 672 { 673 int ret; 674 u32 power_cap; 675 struct powercap_info *pi = ph->get_priv(ph); 676 677 *enable = true; 678 if (PROTOCOL_REV_MAJOR(ph->version) < 0x2) 679 return 0; 680 681 /* 682 * Report always real platform state; platform could have ignored 683 * a previous disable request. Default true on any error. 684 */ 685 ret = scmi_powercap_cap_get(ph, domain_id, &power_cap); 686 if (!ret) 687 *enable = !!power_cap; 688 689 /* Update internal state with current real platform state */ 690 pi->states[domain_id].enabled = *enable; 691 692 return 0; 693 } 694 695 static const struct scmi_powercap_proto_ops powercap_proto_ops = { 696 .num_domains_get = scmi_powercap_num_domains_get, 697 .info_get = scmi_powercap_dom_info_get, 698 .cap_get = scmi_powercap_cap_get, 699 .cap_set = scmi_powercap_cap_set, 700 .cap_enable_set = scmi_powercap_cap_enable_set, 701 .cap_enable_get = scmi_powercap_cap_enable_get, 702 .pai_get = scmi_powercap_pai_get, 703 .pai_set = scmi_powercap_pai_set, 704 .measurements_get = scmi_powercap_measurements_get, 705 .measurements_threshold_set = scmi_powercap_measurements_threshold_set, 706 .measurements_threshold_get = scmi_powercap_measurements_threshold_get, 707 }; 708 709 static void scmi_powercap_domain_init_fc(const struct scmi_protocol_handle *ph, 710 u32 domain, struct scmi_fc_info **p_fc) 711 { 712 struct scmi_fc_info *fc; 713 714 fc = devm_kcalloc(ph->dev, POWERCAP_FC_MAX, sizeof(*fc), GFP_KERNEL); 715 if (!fc) 716 return; 717 718 ph->hops->fastchannel_init(ph, POWERCAP_DESCRIBE_FASTCHANNEL, 719 POWERCAP_CAP_SET, 4, domain, 720 &fc[POWERCAP_FC_CAP].set_addr, 721 &fc[POWERCAP_FC_CAP].set_db, 722 &fc[POWERCAP_FC_CAP].rate_limit); 723 724 ph->hops->fastchannel_init(ph, POWERCAP_DESCRIBE_FASTCHANNEL, 725 POWERCAP_CAP_GET, 4, domain, 726 &fc[POWERCAP_FC_CAP].get_addr, NULL, 727 &fc[POWERCAP_FC_CAP].rate_limit); 728 729 ph->hops->fastchannel_init(ph, POWERCAP_DESCRIBE_FASTCHANNEL, 730 POWERCAP_PAI_SET, 4, domain, 731 &fc[POWERCAP_FC_PAI].set_addr, 732 &fc[POWERCAP_FC_PAI].set_db, 733 &fc[POWERCAP_FC_PAI].rate_limit); 734 735 ph->hops->fastchannel_init(ph, POWERCAP_DESCRIBE_FASTCHANNEL, 736 POWERCAP_PAI_GET, 4, domain, 737 &fc[POWERCAP_FC_PAI].get_addr, NULL, 738 &fc[POWERCAP_FC_PAI].rate_limit); 739 740 *p_fc = fc; 741 } 742 743 static int scmi_powercap_notify(const struct scmi_protocol_handle *ph, 744 u32 domain, int message_id, bool enable) 745 { 746 int ret; 747 struct scmi_xfer *t; 748 749 switch (message_id) { 750 case POWERCAP_CAP_NOTIFY: 751 { 752 struct scmi_msg_powercap_notify_cap *notify; 753 754 ret = ph->xops->xfer_get_init(ph, message_id, 755 sizeof(*notify), 0, &t); 756 if (ret) 757 return ret; 758 759 notify = t->tx.buf; 760 notify->domain = cpu_to_le32(domain); 761 notify->notify_enable = cpu_to_le32(enable ? BIT(0) : 0); 762 break; 763 } 764 case POWERCAP_MEASUREMENTS_NOTIFY: 765 { 766 u32 low, high; 767 struct scmi_msg_powercap_notify_thresh *notify; 768 769 /* 770 * Note that we have to pick the most recently configured 771 * thresholds to build a proper POWERCAP_MEASUREMENTS_NOTIFY 772 * enable request and we fail, complaining, if no thresholds 773 * were ever set, since this is an indication the API has been 774 * used wrongly. 775 */ 776 ret = scmi_powercap_measurements_threshold_get(ph, domain, 777 &low, &high); 778 if (ret) 779 return ret; 780 781 if (enable && !low && !high) { 782 dev_err(ph->dev, 783 "Invalid Measurements Notify thresholds: %u/%u\n", 784 low, high); 785 return -EINVAL; 786 } 787 788 ret = ph->xops->xfer_get_init(ph, message_id, 789 sizeof(*notify), 0, &t); 790 if (ret) 791 return ret; 792 793 notify = t->tx.buf; 794 notify->domain = cpu_to_le32(domain); 795 notify->notify_enable = cpu_to_le32(enable ? BIT(0) : 0); 796 notify->power_thresh_low = cpu_to_le32(low); 797 notify->power_thresh_high = cpu_to_le32(high); 798 break; 799 } 800 default: 801 return -EINVAL; 802 } 803 804 ret = ph->xops->do_xfer(ph, t); 805 806 ph->xops->xfer_put(ph, t); 807 return ret; 808 } 809 810 static bool 811 scmi_powercap_notify_supported(const struct scmi_protocol_handle *ph, 812 u8 evt_id, u32 src_id) 813 { 814 bool supported = false; 815 const struct scmi_powercap_info *dom_info; 816 struct powercap_info *pi = ph->get_priv(ph); 817 818 if (evt_id >= ARRAY_SIZE(evt_2_cmd) || src_id >= pi->num_domains) 819 return false; 820 821 dom_info = pi->powercaps + src_id; 822 if (evt_id == SCMI_EVENT_POWERCAP_CAP_CHANGED) 823 supported = dom_info->notify_powercap_cap_change; 824 else if (evt_id == SCMI_EVENT_POWERCAP_MEASUREMENTS_CHANGED) 825 supported = dom_info->notify_powercap_measurement_change; 826 827 return supported; 828 } 829 830 static int 831 scmi_powercap_set_notify_enabled(const struct scmi_protocol_handle *ph, 832 u8 evt_id, u32 src_id, bool enable) 833 { 834 int ret, cmd_id; 835 struct powercap_info *pi = ph->get_priv(ph); 836 837 if (evt_id >= ARRAY_SIZE(evt_2_cmd) || src_id >= pi->num_domains) 838 return -EINVAL; 839 840 cmd_id = evt_2_cmd[evt_id]; 841 ret = scmi_powercap_notify(ph, src_id, cmd_id, enable); 842 if (ret) 843 pr_debug("FAIL_ENABLED - evt[%X] dom[%d] - ret:%d\n", 844 evt_id, src_id, ret); 845 else if (cmd_id == POWERCAP_MEASUREMENTS_NOTIFY) 846 /* 847 * On success save the current notification enabled state, so 848 * as to be able to properly update the notification thresholds 849 * when they are modified on a domain for which measurement 850 * notifications were currently enabled. 851 * 852 * This is needed because the SCMI Notification core machinery 853 * and API does not support passing per-notification custom 854 * arguments at callback registration time. 855 * 856 * Note that this can be done here with a simple flag since the 857 * SCMI core Notifications code takes care of keeping proper 858 * per-domain enables refcounting, so that this helper function 859 * will be called only once (for enables) when the first user 860 * registers a callback on this domain and once more (disable) 861 * when the last user de-registers its callback. 862 */ 863 pi->states[src_id].meas_notif_enabled = enable; 864 865 return ret; 866 } 867 868 static void * 869 scmi_powercap_fill_custom_report(const struct scmi_protocol_handle *ph, 870 u8 evt_id, ktime_t timestamp, 871 const void *payld, size_t payld_sz, 872 void *report, u32 *src_id) 873 { 874 void *rep = NULL; 875 876 switch (evt_id) { 877 case SCMI_EVENT_POWERCAP_CAP_CHANGED: 878 { 879 const struct scmi_powercap_cap_changed_notify_payld *p = payld; 880 struct scmi_powercap_cap_changed_report *r = report; 881 882 if (sizeof(*p) != payld_sz) 883 break; 884 885 r->timestamp = timestamp; 886 r->agent_id = le32_to_cpu(p->agent_id); 887 r->domain_id = le32_to_cpu(p->domain_id); 888 r->power_cap = le32_to_cpu(p->power_cap); 889 r->pai = le32_to_cpu(p->pai); 890 *src_id = r->domain_id; 891 rep = r; 892 break; 893 } 894 case SCMI_EVENT_POWERCAP_MEASUREMENTS_CHANGED: 895 { 896 const struct scmi_powercap_meas_changed_notify_payld *p = payld; 897 struct scmi_powercap_meas_changed_report *r = report; 898 899 if (sizeof(*p) != payld_sz) 900 break; 901 902 r->timestamp = timestamp; 903 r->agent_id = le32_to_cpu(p->agent_id); 904 r->domain_id = le32_to_cpu(p->domain_id); 905 r->power = le32_to_cpu(p->power); 906 *src_id = r->domain_id; 907 rep = r; 908 break; 909 } 910 default: 911 break; 912 } 913 914 return rep; 915 } 916 917 static int 918 scmi_powercap_get_num_sources(const struct scmi_protocol_handle *ph) 919 { 920 struct powercap_info *pi = ph->get_priv(ph); 921 922 if (!pi) 923 return -EINVAL; 924 925 return pi->num_domains; 926 } 927 928 static const struct scmi_event powercap_events[] = { 929 { 930 .id = SCMI_EVENT_POWERCAP_CAP_CHANGED, 931 .max_payld_sz = 932 sizeof(struct scmi_powercap_cap_changed_notify_payld), 933 .max_report_sz = 934 sizeof(struct scmi_powercap_cap_changed_report), 935 }, 936 { 937 .id = SCMI_EVENT_POWERCAP_MEASUREMENTS_CHANGED, 938 .max_payld_sz = 939 sizeof(struct scmi_powercap_meas_changed_notify_payld), 940 .max_report_sz = 941 sizeof(struct scmi_powercap_meas_changed_report), 942 }, 943 }; 944 945 static const struct scmi_event_ops powercap_event_ops = { 946 .is_notify_supported = scmi_powercap_notify_supported, 947 .get_num_sources = scmi_powercap_get_num_sources, 948 .set_notify_enabled = scmi_powercap_set_notify_enabled, 949 .fill_custom_report = scmi_powercap_fill_custom_report, 950 }; 951 952 static const struct scmi_protocol_events powercap_protocol_events = { 953 .queue_sz = SCMI_PROTO_QUEUE_SZ, 954 .ops = &powercap_event_ops, 955 .evts = powercap_events, 956 .num_events = ARRAY_SIZE(powercap_events), 957 }; 958 959 static int 960 scmi_powercap_protocol_init(const struct scmi_protocol_handle *ph) 961 { 962 int domain, ret; 963 struct powercap_info *pinfo; 964 965 dev_dbg(ph->dev, "Powercap Version %d.%d\n", 966 PROTOCOL_REV_MAJOR(ph->version), PROTOCOL_REV_MINOR(ph->version)); 967 968 pinfo = devm_kzalloc(ph->dev, sizeof(*pinfo), GFP_KERNEL); 969 if (!pinfo) 970 return -ENOMEM; 971 972 ret = scmi_powercap_attributes_get(ph, pinfo); 973 if (ret) 974 return ret; 975 976 pinfo->powercaps = devm_kcalloc(ph->dev, pinfo->num_domains, 977 sizeof(*pinfo->powercaps), 978 GFP_KERNEL); 979 if (!pinfo->powercaps) 980 return -ENOMEM; 981 982 pinfo->states = devm_kcalloc(ph->dev, pinfo->num_domains, 983 sizeof(*pinfo->states), GFP_KERNEL); 984 if (!pinfo->states) 985 return -ENOMEM; 986 987 /* 988 * Note that any failure in retrieving any domain attribute leads to 989 * the whole Powercap protocol initialization failure: this way the 990 * reported Powercap domains are all assured, when accessed, to be well 991 * formed and correlated by sane parent-child relationship (if any). 992 */ 993 for (domain = 0; domain < pinfo->num_domains; domain++) { 994 ret = scmi_powercap_domain_attributes_get(ph, pinfo, domain); 995 if (ret) 996 return ret; 997 998 if (pinfo->powercaps[domain].fastchannels) 999 scmi_powercap_domain_init_fc(ph, domain, 1000 &pinfo->powercaps[domain].fc_info); 1001 1002 /* Grab initial state when disable is supported. */ 1003 if (PROTOCOL_REV_MAJOR(ph->version) >= 0x2) { 1004 ret = __scmi_powercap_cap_get(ph, 1005 &pinfo->powercaps[domain], 1006 &pinfo->states[domain].last_pcap); 1007 if (ret) 1008 return ret; 1009 1010 pinfo->states[domain].enabled = 1011 !!pinfo->states[domain].last_pcap; 1012 } 1013 } 1014 1015 return ph->set_priv(ph, pinfo); 1016 } 1017 1018 static const struct scmi_protocol scmi_powercap = { 1019 .id = SCMI_PROTOCOL_POWERCAP, 1020 .owner = THIS_MODULE, 1021 .instance_init = &scmi_powercap_protocol_init, 1022 .ops = &powercap_proto_ops, 1023 .events = &powercap_protocol_events, 1024 .supported_version = SCMI_PROTOCOL_SUPPORTED_VERSION, 1025 }; 1026 1027 DEFINE_SCMI_PROTOCOL_REGISTER_UNREGISTER(powercap, scmi_powercap) 1028