kernel/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c

   1 /*
   2  * Copyright 2013 Red Hat Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * Authors: Ben Skeggs
  23  */
  24 #include "priv.h"
  25
  26 #include <subdev/bios.h>
  27 #include <subdev/bios/boost.h>
  28 #include <subdev/bios/cstep.h>
  29 #include <subdev/bios/perf.h>
  30 #include <subdev/fb.h>
  31 #include <subdev/therm.h>
  32 #include <subdev/volt.h>
  33
  34 #include <core/option.h>
  35
  36 /******************************************************************************
  37  * misc
  38  *****************************************************************************/
  39 static u32
  40 nvkm_clk_adjust(struct nvkm_clk *clk, bool adjust,
  41                 u8 pstate, u8 domain, u32 input)
  42 {
  43         struct nvkm_bios *bios = clk->subdev.device->bios;
  44         struct nvbios_boostE boostE;
  45         u8  ver, hdr, cnt, len;
  46         u16 data;
  47
  48         data = nvbios_boostEm(bios, pstate, &ver, &hdr, &cnt, &len, &boostE);
  49         if (data) {
  50                 struct nvbios_boostS boostS;
  51                 u8  idx = 0, sver, shdr;
  52                 u16 subd;
  53
  54                 input = max(boostE.min, input);
  55                 input = min(boostE.max, input);
  56                 do {
  57                         sver = ver;
  58                         shdr = hdr;
  59                         subd = nvbios_boostSp(bios, idx++, data, &sver, &shdr,
  60                                               cnt, len, &boostS);
  61                         if (subd && boostS.domain == domain) {
  62                                 if (adjust)
  63                                         input = input * boostS.percent / 100;
  64                                 input = max(boostS.min, input);
  65                                 input = min(boostS.max, input);
  66                                 break;
  67                         }
  68                 } while (subd);
  69         }
  70
  71         return input;
  72 }
  73
  74 /******************************************************************************
  75  * C-States
  76  *****************************************************************************/
  77 static int
  78 nvkm_cstate_prog(struct nvkm_clk *clk, struct nvkm_pstate *pstate, int cstatei)
  79 {
  80         struct nvkm_subdev *subdev = &clk->subdev;
  81         struct nvkm_device *device = subdev->device;
  82         struct nvkm_therm *therm = device->therm;
  83         struct nvkm_volt *volt = device->volt;
  84         struct nvkm_cstate *cstate;
  85         int ret;
  86
  87         if (!list_empty(&pstate->list)) {
  88                 cstate = list_entry(pstate->list.prev, typeof(*cstate), head);
  89         } else {
  90                 cstate = &pstate->base;
  91         }
  92
  93         if (therm) {
  94                 ret = nvkm_therm_cstate(therm, pstate->fanspeed, +1);
  95                 if (ret && ret != -ENODEV) {
  96                         nvkm_error(subdev, "failed to raise fan speed: %d\n", ret);
  97                         return ret;
  98                 }
  99         }
 100
 101         if (volt) {
 102                 ret = nvkm_volt_set_id(volt, cstate->voltage, +1);
 103                 if (ret && ret != -ENODEV) {
 104                         nvkm_error(subdev, "failed to raise voltage: %d\n", ret);
 105                         return ret;
 106                 }
 107         }
 108
 109         ret = clk->func->calc(clk, cstate);
 110         if (ret == 0) {
 111                 ret = clk->func->prog(clk);
 112                 clk->func->tidy(clk);
 113         }
 114
 115         if (volt) {
 116                 ret = nvkm_volt_set_id(volt, cstate->voltage, -1);
 117                 if (ret && ret != -ENODEV)
 118                         nvkm_error(subdev, "failed to lower voltage: %d\n", ret);
 119         }
 120
 121         if (therm) {
 122                 ret = nvkm_therm_cstate(therm, pstate->fanspeed, -1);
 123                 if (ret && ret != -ENODEV)
 124                         nvkm_error(subdev, "failed to lower fan speed: %d\n", ret);
 125         }
 126
 127         return ret;
 128 }
 129
 130 static void
 131 nvkm_cstate_del(struct nvkm_cstate *cstate)
 132 {
 133         list_del(&cstate->head);
 134         kfree(cstate);
 135 }
 136
 137 static int
 138 nvkm_cstate_new(struct nvkm_clk *clk, int idx, struct nvkm_pstate *pstate)
 139 {
 140         struct nvkm_bios *bios = clk->subdev.device->bios;
 141         const struct nvkm_domain *domain = clk->domains;
 142         struct nvkm_cstate *cstate = NULL;
 143         struct nvbios_cstepX cstepX;
 144         u8  ver, hdr;
 145         u16 data;
 146
 147         data = nvbios_cstepXp(bios, idx, &ver, &hdr, &cstepX);
 148         if (!data)
 149                 return -ENOENT;
 150
 151         cstate = kzalloc(sizeof(*cstate), GFP_KERNEL);
 152         if (!cstate)
 153                 return -ENOMEM;
 154
 155         *cstate = pstate->base;
 156         cstate->voltage = cstepX.voltage;
 157
 158         while (domain && domain->name != nv_clk_src_max) {
 159                 if (domain->flags & NVKM_CLK_DOM_FLAG_CORE) {
 160                         u32 freq = nvkm_clk_adjust(clk, true, pstate->pstate,
 161                                                    domain->bios, cstepX.freq);
 162                         cstate->domain[domain->name] = freq;
 163                 }
 164                 domain++;
 165         }
 166
 167         list_add(&cstate->head, &pstate->list);
 168         return 0;
 169 }
 170
 171 /******************************************************************************
 172  * P-States
 173  *****************************************************************************/
 174 static int
 175 nvkm_pstate_prog(struct nvkm_clk *clk, int pstatei)
 176 {
 177         struct nvkm_subdev *subdev = &clk->subdev;
 178         struct nvkm_ram *ram = subdev->device->fb->ram;
 179         struct nvkm_pstate *pstate;
 180         int ret, idx = 0;
 181
 182         list_for_each_entry(pstate, &clk->states, head) {
 183                 if (idx++ == pstatei)
 184                         break;
 185         }
 186
 187         nvkm_debug(subdev, "setting performance state %d\n", pstatei);
 188         clk->pstate = pstatei;
 189
 190         if (ram && ram->func->calc) {
 191                 int khz = pstate->base.domain[nv_clk_src_mem];
 192                 do {
 193                         ret = ram->func->calc(ram, khz);
 194                         if (ret == 0)
 195                                 ret = ram->func->prog(ram);
 196                 } while (ret > 0);
 197                 ram->func->tidy(ram);
 198         }
 199
 200         return nvkm_cstate_prog(clk, pstate, 0);
 201 }
 202
 203 static void
 204 nvkm_pstate_work(struct work_struct *work)
 205 {
 206         struct nvkm_clk *clk = container_of(work, typeof(*clk), work);
 207         struct nvkm_subdev *subdev = &clk->subdev;
 208         int pstate;
 209
 210         if (!atomic_xchg(&clk->waiting, 0))
 211                 return;
 212         clk->pwrsrc = power_supply_is_system_supplied();
 213
 214         nvkm_trace(subdev, "P %d PWR %d U(AC) %d U(DC) %d A %d T %d D %d\n",
 215                    clk->pstate, clk->pwrsrc, clk->ustate_ac, clk->ustate_dc,
 216                    clk->astate, clk->tstate, clk->dstate);
 217
 218         pstate = clk->pwrsrc ? clk->ustate_ac : clk->ustate_dc;
 219         if (clk->state_nr && pstate != -1) {
 220                 pstate = (pstate < 0) ? clk->astate : pstate;
 221                 pstate = min(pstate, clk->state_nr - 1 + clk->tstate);
 222                 pstate = max(pstate, clk->dstate);
 223         } else {
 224                 pstate = clk->pstate = -1;
 225         }
 226
 227         nvkm_trace(subdev, "-> %d\n", pstate);
 228         if (pstate != clk->pstate) {
 229                 int ret = nvkm_pstate_prog(clk, pstate);
 230                 if (ret) {
 231                         nvkm_error(subdev, "error setting pstate %d: %d\n",
 232                                    pstate, ret);
 233                 }
 234         }
 235
 236         wake_up_all(&clk->wait);
 237         nvkm_notify_get(&clk->pwrsrc_ntfy);
 238 }
 239
 240 static int
 241 nvkm_pstate_calc(struct nvkm_clk *clk, bool wait)
 242 {
 243         atomic_set(&clk->waiting, 1);
 244         schedule_work(&clk->work);
 245         if (wait)
 246                 wait_event(clk->wait, !atomic_read(&clk->waiting));
 247         return 0;
 248 }
 249
 250 static void
 251 nvkm_pstate_info(struct nvkm_clk *clk, struct nvkm_pstate *pstate)
 252 {
 253         const struct nvkm_domain *clock = clk->domains - 1;
 254         struct nvkm_cstate *cstate;
 255         struct nvkm_subdev *subdev = &clk->subdev;
 256         char info[3][32] = { "", "", "" };
 257         char name[4] = "--";
 258         int i = -1;
 259
 260         if (pstate->pstate != 0xff)
 261                 snprintf(name, sizeof(name), "%02x", pstate->pstate);
 262
 263         while ((++clock)->name != nv_clk_src_max) {
 264                 u32 lo = pstate->base.domain[clock->name];
 265                 u32 hi = lo;
 266                 if (hi == 0)
 267                         continue;
 268
 269                 nvkm_debug(subdev, "%02x: %10d KHz\n", clock->name, lo);
 270                 list_for_each_entry(cstate, &pstate->list, head) {
 271                         u32 freq = cstate->domain[clock->name];
 272                         lo = min(lo, freq);
 273                         hi = max(hi, freq);
 274                         nvkm_debug(subdev, "%10d KHz\n", freq);
 275                 }
 276
 277                 if (clock->mname && ++i < ARRAY_SIZE(info)) {
 278                         lo /= clock->mdiv;
 279                         hi /= clock->mdiv;
 280                         if (lo == hi) {
 281                                 snprintf(info[i], sizeof(info[i]), "%s %d MHz",
 282                                          clock->mname, lo);
 283                         } else {
 284                                 snprintf(info[i], sizeof(info[i]),
 285                                          "%s %d-%d MHz", clock->mname, lo, hi);
 286                         }
 287                 }
 288         }
 289
 290         nvkm_debug(subdev, "%s: %s %s %s\n", name, info[0], info[1], info[2]);
 291 }
 292
 293 static void
 294 nvkm_pstate_del(struct nvkm_pstate *pstate)
 295 {
 296         struct nvkm_cstate *cstate, *temp;
 297
 298         list_for_each_entry_safe(cstate, temp, &pstate->list, head) {
 299                 nvkm_cstate_del(cstate);
 300         }
 301
 302         list_del(&pstate->head);
 303         kfree(pstate);
 304 }
 305
 306 static int
 307 nvkm_pstate_new(struct nvkm_clk *clk, int idx)
 308 {
 309         struct nvkm_bios *bios = clk->subdev.device->bios;
 310         const struct nvkm_domain *domain = clk->domains - 1;
 311         struct nvkm_pstate *pstate;
 312         struct nvkm_cstate *cstate;
 313         struct nvbios_cstepE cstepE;
 314         struct nvbios_perfE perfE;
 315         u8  ver, hdr, cnt, len;
 316         u16 data;
 317
 318         data = nvbios_perfEp(bios, idx, &ver, &hdr, &cnt, &len, &perfE);
 319         if (!data)
 320                 return -EINVAL;
 321         if (perfE.pstate == 0xff)
 322                 return 0;
 323
 324         pstate = kzalloc(sizeof(*pstate), GFP_KERNEL);
 325         cstate = &pstate->base;
 326         if (!pstate)
 327                 return -ENOMEM;
 328
 329         INIT_LIST_HEAD(&pstate->list);
 330
 331         pstate->pstate = perfE.pstate;
 332         pstate->fanspeed = perfE.fanspeed;
 333         cstate->voltage = perfE.voltage;
 334         cstate->domain[nv_clk_src_core] = perfE.core;
 335         cstate->domain[nv_clk_src_shader] = perfE.shader;
 336         cstate->domain[nv_clk_src_mem] = perfE.memory;
 337         cstate->domain[nv_clk_src_vdec] = perfE.vdec;
 338         cstate->domain[nv_clk_src_dom6] = perfE.disp;
 339
 340         while (ver >= 0x40 && (++domain)->name != nv_clk_src_max) {
 341                 struct nvbios_perfS perfS;
 342                 u8  sver = ver, shdr = hdr;
 343                 u32 perfSe = nvbios_perfSp(bios, data, domain->bios,
 344                                           &sver, &shdr, cnt, len, &perfS);
 345                 if (perfSe == 0 || sver != 0x40)
 346                         continue;
 347
 348                 if (domain->flags & NVKM_CLK_DOM_FLAG_CORE) {
 349                         perfS.v40.freq = nvkm_clk_adjust(clk, false,
 350                                                          pstate->pstate,
 351                                                          domain->bios,
 352                                                          perfS.v40.freq);
 353                 }
 354
 355                 cstate->domain[domain->name] = perfS.v40.freq;
 356         }
 357
 358         data = nvbios_cstepEm(bios, pstate->pstate, &ver, &hdr, &cstepE);
 359         if (data) {
 360                 int idx = cstepE.index;
 361                 do {
 362                         nvkm_cstate_new(clk, idx, pstate);
 363                 } while(idx--);
 364         }
 365
 366         nvkm_pstate_info(clk, pstate);
 367         list_add_tail(&pstate->head, &clk->states);
 368         clk->state_nr++;
 369         return 0;
 370 }
 371
 372 /******************************************************************************
 373  * Adjustment triggers
 374  *****************************************************************************/
 375 static int
 376 nvkm_clk_ustate_update(struct nvkm_clk *clk, int req)
 377 {
 378         struct nvkm_pstate *pstate;
 379         int i = 0;
 380
 381         if (!clk->allow_reclock)
 382                 return -ENOSYS;
 383
 384         if (req != -1 && req != -2) {
 385                 list_for_each_entry(pstate, &clk->states, head) {
 386                         if (pstate->pstate == req)
 387                                 break;
 388                         i++;
 389                 }
 390
 391                 if (pstate->pstate != req)
 392                         return -EINVAL;
 393                 req = i;
 394         }
 395
 396         return req + 2;
 397 }
 398
 399 static int
 400 nvkm_clk_nstate(struct nvkm_clk *clk, const char *mode, int arglen)
 401 {
 402         int ret = 1;
 403
 404         if (clk->allow_reclock && !strncasecmpz(mode, "auto", arglen))
 405                 return -2;
 406
 407         if (strncasecmpz(mode, "disabled", arglen)) {
 408                 char save = mode[arglen];
 409                 long v;
 410
 411                 ((char *)mode)[arglen] = '\0';
 412                 if (!kstrtol(mode, 0, &v)) {
 413                         ret = nvkm_clk_ustate_update(clk, v);
 414                         if (ret < 0)
 415                                 ret = 1;
 416                 }
 417                 ((char *)mode)[arglen] = save;
 418         }
 419
 420         return ret - 2;
 421 }
 422
 423 int
 424 nvkm_clk_ustate(struct nvkm_clk *clk, int req, int pwr)
 425 {
 426         int ret = nvkm_clk_ustate_update(clk, req);
 427         if (ret >= 0) {
 428                 if (ret -= 2, pwr) clk->ustate_ac = ret;
 429                 else               clk->ustate_dc = ret;
 430                 return nvkm_pstate_calc(clk, true);
 431         }
 432         return ret;
 433 }
 434
 435 int
 436 nvkm_clk_astate(struct nvkm_clk *clk, int req, int rel, bool wait)
 437 {
 438         if (!rel) clk->astate  = req;
 439         if ( rel) clk->astate += rel;
 440         clk->astate = min(clk->astate, clk->state_nr - 1);
 441         clk->astate = max(clk->astate, 0);
 442         return nvkm_pstate_calc(clk, wait);
 443 }
 444
 445 int
 446 nvkm_clk_tstate(struct nvkm_clk *clk, int req, int rel)
 447 {
 448         if (!rel) clk->tstate  = req;
 449         if ( rel) clk->tstate += rel;
 450         clk->tstate = min(clk->tstate, 0);
 451         clk->tstate = max(clk->tstate, -(clk->state_nr - 1));
 452         return nvkm_pstate_calc(clk, true);
 453 }
 454
 455 int
 456 nvkm_clk_dstate(struct nvkm_clk *clk, int req, int rel)
 457 {
 458         if (!rel) clk->dstate  = req;
 459         if ( rel) clk->dstate += rel;
 460         clk->dstate = min(clk->dstate, clk->state_nr - 1);
 461         clk->dstate = max(clk->dstate, 0);
 462         return nvkm_pstate_calc(clk, true);
 463 }
 464
 465 static int
 466 nvkm_clk_pwrsrc(struct nvkm_notify *notify)
 467 {
 468         struct nvkm_clk *clk =
 469                 container_of(notify, typeof(*clk), pwrsrc_ntfy);
 470         nvkm_pstate_calc(clk, false);
 471         return NVKM_NOTIFY_DROP;
 472 }
 473
 474 /******************************************************************************
 475  * subdev base class implementation
 476  *****************************************************************************/
 477
 478 int
 479 nvkm_clk_read(struct nvkm_clk *clk, enum nv_clk_src src)
 480 {
 481         return clk->func->read(clk, src);
 482 }
 483
 484 static int
 485 nvkm_clk_fini(struct nvkm_subdev *subdev, bool suspend)
 486 {
 487         struct nvkm_clk *clk = nvkm_clk(subdev);
 488         nvkm_notify_put(&clk->pwrsrc_ntfy);
 489         flush_work(&clk->work);
 490         if (clk->func->fini)
 491                 clk->func->fini(clk);
 492         return 0;
 493 }
 494
 495 static int
 496 nvkm_clk_init(struct nvkm_subdev *subdev)
 497 {
 498         struct nvkm_clk *clk = nvkm_clk(subdev);
 499         const struct nvkm_domain *clock = clk->domains;
 500         int ret;
 501
 502         memset(&clk->bstate, 0x00, sizeof(clk->bstate));
 503         INIT_LIST_HEAD(&clk->bstate.list);
 504         clk->bstate.pstate = 0xff;
 505
 506         while (clock->name != nv_clk_src_max) {
 507                 ret = nvkm_clk_read(clk, clock->name);
 508                 if (ret < 0) {
 509                         nvkm_error(subdev, "%02x freq unknown\n", clock->name);
 510                         return ret;
 511                 }
 512                 clk->bstate.base.domain[clock->name] = ret;
 513                 clock++;
 514         }
 515
 516         nvkm_pstate_info(clk, &clk->bstate);
 517
 518         if (clk->func->init)
 519                 return clk->func->init(clk);
 520
 521         clk->astate = clk->state_nr - 1;
 522         clk->tstate = 0;
 523         clk->dstate = 0;
 524         clk->pstate = -1;
 525         nvkm_pstate_calc(clk, true);
 526         return 0;
 527 }
 528
 529 static void *
 530 nvkm_clk_dtor(struct nvkm_subdev *subdev)
 531 {
 532         struct nvkm_clk *clk = nvkm_clk(subdev);
 533         struct nvkm_pstate *pstate, *temp;
 534
 535         nvkm_notify_fini(&clk->pwrsrc_ntfy);
 536
 537         /* Early return if the pstates have been provided statically */
 538         if (clk->func->pstates)
 539                 return clk;
 540
 541         list_for_each_entry_safe(pstate, temp, &clk->states, head) {
 542                 nvkm_pstate_del(pstate);
 543         }
 544
 545         return clk;
 546 }
 547
 548 static const struct nvkm_subdev_func
 549 nvkm_clk = {
 550         .dtor = nvkm_clk_dtor,
 551         .init = nvkm_clk_init,
 552         .fini = nvkm_clk_fini,
 553 };
 554
 555 int
 556 nvkm_clk_ctor(const struct nvkm_clk_func *func, struct nvkm_device *device,
 557               int index, bool allow_reclock, struct nvkm_clk *clk)
 558 {
 559         int ret, idx, arglen;
 560         const char *mode;
 561
 562         nvkm_subdev_ctor(&nvkm_clk, device, index, 0, &clk->subdev);
 563         clk->func = func;
 564         INIT_LIST_HEAD(&clk->states);
 565         clk->domains = func->domains;
 566         clk->ustate_ac = -1;
 567         clk->ustate_dc = -1;
 568         clk->allow_reclock = allow_reclock;
 569
 570         INIT_WORK(&clk->work, nvkm_pstate_work);
 571         init_waitqueue_head(&clk->wait);
 572         atomic_set(&clk->waiting, 0);
 573
 574         /* If no pstates are provided, try and fetch them from the BIOS */
 575         if (!func->pstates) {
 576                 idx = 0;
 577                 do {
 578                         ret = nvkm_pstate_new(clk, idx++);
 579                 } while (ret == 0);
 580         } else {
 581                 for (idx = 0; idx < func->nr_pstates; idx++)
 582                         list_add_tail(&func->pstates[idx].head, &clk->states);
 583                 clk->state_nr = func->nr_pstates;
 584         }
 585
 586         ret = nvkm_notify_init(NULL, &device->event, nvkm_clk_pwrsrc, true,
 587                                NULL, 0, 0, &clk->pwrsrc_ntfy);
 588         if (ret)
 589                 return ret;
 590
 591         mode = nvkm_stropt(device->cfgopt, "NvClkMode", &arglen);
 592         if (mode) {
 593                 clk->ustate_ac = nvkm_clk_nstate(clk, mode, arglen);
 594                 clk->ustate_dc = nvkm_clk_nstate(clk, mode, arglen);
 595         }
 596
 597         mode = nvkm_stropt(device->cfgopt, "NvClkModeAC", &arglen);
 598         if (mode)
 599                 clk->ustate_ac = nvkm_clk_nstate(clk, mode, arglen);
 600
 601         mode = nvkm_stropt(device->cfgopt, "NvClkModeDC", &arglen);
 602         if (mode)
 603                 clk->ustate_dc = nvkm_clk_nstate(clk, mode, arglen);
 604
 605         return 0;
 606 }
 607
 608 int
 609 nvkm_clk_new_(const struct nvkm_clk_func *func, struct nvkm_device *device,
 610               int index, bool allow_reclock, struct nvkm_clk **pclk)
 611 {
 612         if (!(*pclk = kzalloc(sizeof(**pclk), GFP_KERNEL)))
 613                 return -ENOMEM;
 614         return nvkm_clk_ctor(func, device, index, allow_reclock, *pclk);
 615 }