drivers/gpu/drm/msm/msm_gpu.c

   1 /*
   2  * Copyright (C) 2013 Red Hat
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "msm_gpu.h"
  19 #include "msm_gem.h"
  20 #include "msm_mmu.h"
  21 #include "msm_fence.h"
  22
  23
  24 /*
  25  * Power Management:
  26  */
  27
  28 #ifdef DOWNSTREAM_CONFIG_MSM_BUS_SCALING
  29 #include <mach/board.h>
  30 static void bs_init(struct msm_gpu *gpu)
  31 {
  32         if (gpu->bus_scale_table) {
  33                 gpu->bsc = msm_bus_scale_register_client(gpu->bus_scale_table);
  34                 DBG("bus scale client: %08x", gpu->bsc);
  35         }
  36 }
  37
  38 static void bs_fini(struct msm_gpu *gpu)
  39 {
  40         if (gpu->bsc) {
  41                 msm_bus_scale_unregister_client(gpu->bsc);
  42                 gpu->bsc = 0;
  43         }
  44 }
  45
  46 static void bs_set(struct msm_gpu *gpu, int idx)
  47 {
  48         if (gpu->bsc) {
  49                 DBG("set bus scaling: %d", idx);
  50                 msm_bus_scale_client_update_request(gpu->bsc, idx);
  51         }
  52 }
  53 #else
  54 static void bs_init(struct msm_gpu *gpu) {}
  55 static void bs_fini(struct msm_gpu *gpu) {}
  56 static void bs_set(struct msm_gpu *gpu, int idx) {}
  57 #endif
  58
  59 static int enable_pwrrail(struct msm_gpu *gpu)
  60 {
  61         struct drm_device *dev = gpu->dev;
  62         int ret = 0;
  63
  64         if (gpu->gpu_reg) {
  65                 ret = regulator_enable(gpu->gpu_reg);
  66                 if (ret) {
  67                         dev_err(dev->dev, "failed to enable 'gpu_reg': %d\n", ret);
  68                         return ret;
  69                 }
  70         }
  71
  72         if (gpu->gpu_cx) {
  73                 ret = regulator_enable(gpu->gpu_cx);
  74                 if (ret) {
  75                         dev_err(dev->dev, "failed to enable 'gpu_cx': %d\n", ret);
  76                         return ret;
  77                 }
  78         }
  79
  80         return 0;
  81 }
  82
  83 static int disable_pwrrail(struct msm_gpu *gpu)
  84 {
  85         if (gpu->gpu_cx)
  86                 regulator_disable(gpu->gpu_cx);
  87         if (gpu->gpu_reg)
  88                 regulator_disable(gpu->gpu_reg);
  89         return 0;
  90 }
  91
  92 static int enable_clk(struct msm_gpu *gpu)
  93 {
  94         int i;
  95
  96         if (gpu->grp_clks[0] && gpu->fast_rate)
  97                 clk_set_rate(gpu->grp_clks[0], gpu->fast_rate);
  98
  99         /* Set the RBBM timer rate to 19.2Mhz */
 100         if (gpu->grp_clks[2])
 101                 clk_set_rate(gpu->grp_clks[2], 19200000);
 102
 103         for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i >= 0; i--)
 104                 if (gpu->grp_clks[i])
 105                         clk_prepare(gpu->grp_clks[i]);
 106
 107         for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i >= 0; i--)
 108                 if (gpu->grp_clks[i])
 109                         clk_enable(gpu->grp_clks[i]);
 110
 111         return 0;
 112 }
 113
 114 static int disable_clk(struct msm_gpu *gpu)
 115 {
 116         int i;
 117
 118         for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i >= 0; i--)
 119                 if (gpu->grp_clks[i])
 120                         clk_disable(gpu->grp_clks[i]);
 121
 122         for (i = ARRAY_SIZE(gpu->grp_clks) - 1; i >= 0; i--)
 123                 if (gpu->grp_clks[i])
 124                         clk_unprepare(gpu->grp_clks[i]);
 125
 126         if (gpu->grp_clks[0] && gpu->slow_rate)
 127                 clk_set_rate(gpu->grp_clks[0], gpu->slow_rate);
 128
 129         if (gpu->grp_clks[2])
 130                 clk_set_rate(gpu->grp_clks[2], 0);
 131
 132         return 0;
 133 }
 134
 135 static int enable_axi(struct msm_gpu *gpu)
 136 {
 137         if (gpu->ebi1_clk)
 138                 clk_prepare_enable(gpu->ebi1_clk);
 139         if (gpu->bus_freq)
 140                 bs_set(gpu, gpu->bus_freq);
 141         return 0;
 142 }
 143
 144 static int disable_axi(struct msm_gpu *gpu)
 145 {
 146         if (gpu->ebi1_clk)
 147                 clk_disable_unprepare(gpu->ebi1_clk);
 148         if (gpu->bus_freq)
 149                 bs_set(gpu, 0);
 150         return 0;
 151 }
 152
 153 int msm_gpu_pm_resume(struct msm_gpu *gpu)
 154 {
 155         struct drm_device *dev = gpu->dev;
 156         int ret;
 157
 158         DBG("%s: active_cnt=%d", gpu->name, gpu->active_cnt);
 159
 160         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 161
 162         if (gpu->active_cnt++ > 0)
 163                 return 0;
 164
 165         if (WARN_ON(gpu->active_cnt <= 0))
 166                 return -EINVAL;
 167
 168         ret = enable_pwrrail(gpu);
 169         if (ret)
 170                 return ret;
 171
 172         ret = enable_clk(gpu);
 173         if (ret)
 174                 return ret;
 175
 176         ret = enable_axi(gpu);
 177         if (ret)
 178                 return ret;
 179
 180         return 0;
 181 }
 182
 183 int msm_gpu_pm_suspend(struct msm_gpu *gpu)
 184 {
 185         struct drm_device *dev = gpu->dev;
 186         int ret;
 187
 188         DBG("%s: active_cnt=%d", gpu->name, gpu->active_cnt);
 189
 190         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 191
 192         if (--gpu->active_cnt > 0)
 193                 return 0;
 194
 195         if (WARN_ON(gpu->active_cnt < 0))
 196                 return -EINVAL;
 197
 198         ret = disable_axi(gpu);
 199         if (ret)
 200                 return ret;
 201
 202         ret = disable_clk(gpu);
 203         if (ret)
 204                 return ret;
 205
 206         ret = disable_pwrrail(gpu);
 207         if (ret)
 208                 return ret;
 209
 210         return 0;
 211 }
 212
 213 /*
 214  * Inactivity detection (for suspend):
 215  */
 216
 217 static void inactive_worker(struct work_struct *work)
 218 {
 219         struct msm_gpu *gpu = container_of(work, struct msm_gpu, inactive_work);
 220         struct drm_device *dev = gpu->dev;
 221
 222         if (gpu->inactive)
 223                 return;
 224
 225         DBG("%s: inactive!\n", gpu->name);
 226         mutex_lock(&dev->struct_mutex);
 227         if (!(msm_gpu_active(gpu) || gpu->inactive)) {
 228                 disable_axi(gpu);
 229                 disable_clk(gpu);
 230                 gpu->inactive = true;
 231         }
 232         mutex_unlock(&dev->struct_mutex);
 233 }
 234
 235 static void inactive_handler(unsigned long data)
 236 {
 237         struct msm_gpu *gpu = (struct msm_gpu *)data;
 238         struct msm_drm_private *priv = gpu->dev->dev_private;
 239
 240         queue_work(priv->wq, &gpu->inactive_work);
 241 }
 242
 243 /* cancel inactive timer and make sure we are awake: */
 244 static void inactive_cancel(struct msm_gpu *gpu)
 245 {
 246         DBG("%s", gpu->name);
 247         del_timer(&gpu->inactive_timer);
 248         if (gpu->inactive) {
 249                 enable_clk(gpu);
 250                 enable_axi(gpu);
 251                 gpu->inactive = false;
 252         }
 253 }
 254
 255 static void inactive_start(struct msm_gpu *gpu)
 256 {
 257         DBG("%s", gpu->name);
 258         mod_timer(&gpu->inactive_timer,
 259                         round_jiffies_up(jiffies + DRM_MSM_INACTIVE_JIFFIES));
 260 }
 261
 262 /*
 263  * Hangcheck detection for locked gpu:
 264  */
 265
 266 static void retire_submits(struct msm_gpu *gpu);
 267
 268 static void recover_worker(struct work_struct *work)
 269 {
 270         struct msm_gpu *gpu = container_of(work, struct msm_gpu, recover_work);
 271         struct drm_device *dev = gpu->dev;
 272         struct msm_gem_submit *submit;
 273         uint32_t fence = gpu->funcs->last_fence(gpu);
 274
 275         msm_update_fence(gpu->fctx, fence + 1);
 276
 277         mutex_lock(&dev->struct_mutex);
 278
 279         dev_err(dev->dev, "%s: hangcheck recover!\n", gpu->name);
 280         list_for_each_entry(submit, &gpu->submit_list, node) {
 281                 if (submit->fence->seqno == (fence + 1)) {
 282                         struct task_struct *task;
 283
 284                         rcu_read_lock();
 285                         task = pid_task(submit->pid, PIDTYPE_PID);
 286                         if (task) {
 287                                 dev_err(dev->dev, "%s: offending task: %s\n",
 288                                                 gpu->name, task->comm);
 289                         }
 290                         rcu_read_unlock();
 291                         break;
 292                 }
 293         }
 294
 295         if (msm_gpu_active(gpu)) {
 296                 /* retire completed submits, plus the one that hung: */
 297                 retire_submits(gpu);
 298
 299                 inactive_cancel(gpu);
 300                 gpu->funcs->recover(gpu);
 301
 302                 /* replay the remaining submits after the one that hung: */
 303                 list_for_each_entry(submit, &gpu->submit_list, node) {
 304                         gpu->funcs->submit(gpu, submit, NULL);
 305                 }
 306         }
 307
 308         mutex_unlock(&dev->struct_mutex);
 309
 310         msm_gpu_retire(gpu);
 311 }
 312
 313 static void hangcheck_timer_reset(struct msm_gpu *gpu)
 314 {
 315         DBG("%s", gpu->name);
 316         mod_timer(&gpu->hangcheck_timer,
 317                         round_jiffies_up(jiffies + DRM_MSM_HANGCHECK_JIFFIES));
 318 }
 319
 320 static void hangcheck_handler(unsigned long data)
 321 {
 322         struct msm_gpu *gpu = (struct msm_gpu *)data;
 323         struct drm_device *dev = gpu->dev;
 324         struct msm_drm_private *priv = dev->dev_private;
 325         uint32_t fence = gpu->funcs->last_fence(gpu);
 326
 327         if (fence != gpu->hangcheck_fence) {
 328                 /* some progress has been made.. ya! */
 329                 gpu->hangcheck_fence = fence;
 330         } else if (fence < gpu->fctx->last_fence) {
 331                 /* no progress and not done.. hung! */
 332                 gpu->hangcheck_fence = fence;
 333                 dev_err(dev->dev, "%s: hangcheck detected gpu lockup!\n",
 334                                 gpu->name);
 335                 dev_err(dev->dev, "%s:     completed fence: %u\n",
 336                                 gpu->name, fence);
 337                 dev_err(dev->dev, "%s:     submitted fence: %u\n",
 338                                 gpu->name, gpu->fctx->last_fence);
 339                 queue_work(priv->wq, &gpu->recover_work);
 340         }
 341
 342         /* if still more pending work, reset the hangcheck timer: */
 343         if (gpu->fctx->last_fence > gpu->hangcheck_fence)
 344                 hangcheck_timer_reset(gpu);
 345
 346         /* workaround for missing irq: */
 347         queue_work(priv->wq, &gpu->retire_work);
 348 }
 349
 350 /*
 351  * Performance Counters:
 352  */
 353
 354 /* called under perf_lock */
 355 static int update_hw_cntrs(struct msm_gpu *gpu, uint32_t ncntrs, uint32_t *cntrs)
 356 {
 357         uint32_t current_cntrs[ARRAY_SIZE(gpu->last_cntrs)];
 358         int i, n = min(ncntrs, gpu->num_perfcntrs);
 359
 360         /* read current values: */
 361         for (i = 0; i < gpu->num_perfcntrs; i++)
 362                 current_cntrs[i] = gpu_read(gpu, gpu->perfcntrs[i].sample_reg);
 363
 364         /* update cntrs: */
 365         for (i = 0; i < n; i++)
 366                 cntrs[i] = current_cntrs[i] - gpu->last_cntrs[i];
 367
 368         /* save current values: */
 369         for (i = 0; i < gpu->num_perfcntrs; i++)
 370                 gpu->last_cntrs[i] = current_cntrs[i];
 371
 372         return n;
 373 }
 374
 375 static void update_sw_cntrs(struct msm_gpu *gpu)
 376 {
 377         ktime_t time;
 378         uint32_t elapsed;
 379         unsigned long flags;
 380
 381         spin_lock_irqsave(&gpu->perf_lock, flags);
 382         if (!gpu->perfcntr_active)
 383                 goto out;
 384
 385         time = ktime_get();
 386         elapsed = ktime_to_us(ktime_sub(time, gpu->last_sample.time));
 387
 388         gpu->totaltime += elapsed;
 389         if (gpu->last_sample.active)
 390                 gpu->activetime += elapsed;
 391
 392         gpu->last_sample.active = msm_gpu_active(gpu);
 393         gpu->last_sample.time = time;
 394
 395 out:
 396         spin_unlock_irqrestore(&gpu->perf_lock, flags);
 397 }
 398
 399 void msm_gpu_perfcntr_start(struct msm_gpu *gpu)
 400 {
 401         unsigned long flags;
 402
 403         spin_lock_irqsave(&gpu->perf_lock, flags);
 404         /* we could dynamically enable/disable perfcntr registers too.. */
 405         gpu->last_sample.active = msm_gpu_active(gpu);
 406         gpu->last_sample.time = ktime_get();
 407         gpu->activetime = gpu->totaltime = 0;
 408         gpu->perfcntr_active = true;
 409         update_hw_cntrs(gpu, 0, NULL);
 410         spin_unlock_irqrestore(&gpu->perf_lock, flags);
 411 }
 412
 413 void msm_gpu_perfcntr_stop(struct msm_gpu *gpu)
 414 {
 415         gpu->perfcntr_active = false;
 416 }
 417
 418 /* returns -errno or # of cntrs sampled */
 419 int msm_gpu_perfcntr_sample(struct msm_gpu *gpu, uint32_t *activetime,
 420                 uint32_t *totaltime, uint32_t ncntrs, uint32_t *cntrs)
 421 {
 422         unsigned long flags;
 423         int ret;
 424
 425         spin_lock_irqsave(&gpu->perf_lock, flags);
 426
 427         if (!gpu->perfcntr_active) {
 428                 ret = -EINVAL;
 429                 goto out;
 430         }
 431
 432         *activetime = gpu->activetime;
 433         *totaltime = gpu->totaltime;
 434
 435         gpu->activetime = gpu->totaltime = 0;
 436
 437         ret = update_hw_cntrs(gpu, ncntrs, cntrs);
 438
 439 out:
 440         spin_unlock_irqrestore(&gpu->perf_lock, flags);
 441
 442         return ret;
 443 }
 444
 445 /*
 446  * Cmdstream submission/retirement:
 447  */
 448
 449 static void retire_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit)
 450 {
 451         int i;
 452
 453         for (i = 0; i < submit->nr_bos; i++) {
 454                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 455                 /* move to inactive: */
 456                 msm_gem_move_to_inactive(&msm_obj->base);
 457                 msm_gem_put_iova(&msm_obj->base, gpu->id);
 458                 drm_gem_object_unreference(&msm_obj->base);
 459         }
 460
 461         msm_gem_submit_free(submit);
 462 }
 463
 464 static void retire_submits(struct msm_gpu *gpu)
 465 {
 466         struct drm_device *dev = gpu->dev;
 467
 468         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 469
 470         while (!list_empty(&gpu->submit_list)) {
 471                 struct msm_gem_submit *submit;
 472
 473                 submit = list_first_entry(&gpu->submit_list,
 474                                 struct msm_gem_submit, node);
 475
 476                 if (dma_fence_is_signaled(submit->fence)) {
 477                         retire_submit(gpu, submit);
 478                 } else {
 479                         break;
 480                 }
 481         }
 482 }
 483
 484 static void retire_worker(struct work_struct *work)
 485 {
 486         struct msm_gpu *gpu = container_of(work, struct msm_gpu, retire_work);
 487         struct drm_device *dev = gpu->dev;
 488         uint32_t fence = gpu->funcs->last_fence(gpu);
 489
 490         msm_update_fence(gpu->fctx, fence);
 491
 492         mutex_lock(&dev->struct_mutex);
 493         retire_submits(gpu);
 494         mutex_unlock(&dev->struct_mutex);
 495
 496         if (!msm_gpu_active(gpu))
 497                 inactive_start(gpu);
 498 }
 499
 500 /* call from irq handler to schedule work to retire bo's */
 501 void msm_gpu_retire(struct msm_gpu *gpu)
 502 {
 503         struct msm_drm_private *priv = gpu->dev->dev_private;
 504         queue_work(priv->wq, &gpu->retire_work);
 505         update_sw_cntrs(gpu);
 506 }
 507
 508 /* add bo's to gpu's ring, and kick gpu: */
 509 void msm_gpu_submit(struct msm_gpu *gpu, struct msm_gem_submit *submit,
 510                 struct msm_file_private *ctx)
 511 {
 512         struct drm_device *dev = gpu->dev;
 513         struct msm_drm_private *priv = dev->dev_private;
 514         int i;
 515
 516         WARN_ON(!mutex_is_locked(&dev->struct_mutex));
 517
 518         inactive_cancel(gpu);
 519
 520         list_add_tail(&submit->node, &gpu->submit_list);
 521
 522         msm_rd_dump_submit(submit);
 523
 524         update_sw_cntrs(gpu);
 525
 526         for (i = 0; i < submit->nr_bos; i++) {
 527                 struct msm_gem_object *msm_obj = submit->bos[i].obj;
 528                 uint64_t iova;
 529
 530                 /* can't happen yet.. but when we add 2d support we'll have
 531                  * to deal w/ cross-ring synchronization:
 532                  */
 533                 WARN_ON(is_active(msm_obj) && (msm_obj->gpu != gpu));
 534
 535                 /* submit takes a reference to the bo and iova until retired: */
 536                 drm_gem_object_reference(&msm_obj->base);
 537                 msm_gem_get_iova_locked(&msm_obj->base,
 538                                 submit->gpu->id, &iova);
 539
 540                 if (submit->bos[i].flags & MSM_SUBMIT_BO_WRITE)
 541                         msm_gem_move_to_active(&msm_obj->base, gpu, true, submit->fence);
 542                 else if (submit->bos[i].flags & MSM_SUBMIT_BO_READ)
 543                         msm_gem_move_to_active(&msm_obj->base, gpu, false, submit->fence);
 544         }
 545
 546         gpu->funcs->submit(gpu, submit, ctx);
 547         priv->lastctx = ctx;
 548
 549         hangcheck_timer_reset(gpu);
 550 }
 551
 552 /*
 553  * Init/Cleanup:
 554  */
 555
 556 static irqreturn_t irq_handler(int irq, void *data)
 557 {
 558         struct msm_gpu *gpu = data;
 559         return gpu->funcs->irq(gpu);
 560 }
 561
 562 static const char *clk_names[] = {
 563         "core", "iface", "rbbmtimer", "mem", "mem_iface", "alt_mem_iface",
 564 };
 565
 566 int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 567                 struct msm_gpu *gpu, const struct msm_gpu_funcs *funcs,
 568                 const char *name, const char *ioname, const char *irqname, int ringsz)
 569 {
 570         struct iommu_domain *iommu;
 571         int i, ret;
 572
 573         if (WARN_ON(gpu->num_perfcntrs > ARRAY_SIZE(gpu->last_cntrs)))
 574                 gpu->num_perfcntrs = ARRAY_SIZE(gpu->last_cntrs);
 575
 576         gpu->dev = drm;
 577         gpu->funcs = funcs;
 578         gpu->name = name;
 579         gpu->inactive = true;
 580         gpu->fctx = msm_fence_context_alloc(drm, name);
 581         if (IS_ERR(gpu->fctx)) {
 582                 ret = PTR_ERR(gpu->fctx);
 583                 gpu->fctx = NULL;
 584                 goto fail;
 585         }
 586
 587         INIT_LIST_HEAD(&gpu->active_list);
 588         INIT_WORK(&gpu->retire_work, retire_worker);
 589         INIT_WORK(&gpu->inactive_work, inactive_worker);
 590         INIT_WORK(&gpu->recover_work, recover_worker);
 591
 592         INIT_LIST_HEAD(&gpu->submit_list);
 593
 594         setup_timer(&gpu->inactive_timer, inactive_handler,
 595                         (unsigned long)gpu);
 596         setup_timer(&gpu->hangcheck_timer, hangcheck_handler,
 597                         (unsigned long)gpu);
 598
 599         spin_lock_init(&gpu->perf_lock);
 600
 601         BUG_ON(ARRAY_SIZE(clk_names) != ARRAY_SIZE(gpu->grp_clks));
 602
 603         /* Map registers: */
 604         gpu->mmio = msm_ioremap(pdev, ioname, name);
 605         if (IS_ERR(gpu->mmio)) {
 606                 ret = PTR_ERR(gpu->mmio);
 607                 goto fail;
 608         }
 609
 610         /* Get Interrupt: */
 611         gpu->irq = platform_get_irq_byname(pdev, irqname);
 612         if (gpu->irq < 0) {
 613                 ret = gpu->irq;
 614                 dev_err(drm->dev, "failed to get irq: %d\n", ret);
 615                 goto fail;
 616         }
 617
 618         ret = devm_request_irq(&pdev->dev, gpu->irq, irq_handler,
 619                         IRQF_TRIGGER_HIGH, gpu->name, gpu);
 620         if (ret) {
 621                 dev_err(drm->dev, "failed to request IRQ%u: %d\n", gpu->irq, ret);
 622                 goto fail;
 623         }
 624
 625         /* Acquire clocks: */
 626         for (i = 0; i < ARRAY_SIZE(clk_names); i++) {
 627                 gpu->grp_clks[i] = msm_clk_get(pdev, clk_names[i]);
 628                 DBG("grp_clks[%s]: %p", clk_names[i], gpu->grp_clks[i]);
 629                 if (IS_ERR(gpu->grp_clks[i]))
 630                         gpu->grp_clks[i] = NULL;
 631         }
 632
 633         gpu->ebi1_clk = msm_clk_get(pdev, "bus");
 634         DBG("ebi1_clk: %p", gpu->ebi1_clk);
 635         if (IS_ERR(gpu->ebi1_clk))
 636                 gpu->ebi1_clk = NULL;
 637
 638         /* Acquire regulators: */
 639         gpu->gpu_reg = devm_regulator_get(&pdev->dev, "vdd");
 640         DBG("gpu_reg: %p", gpu->gpu_reg);
 641         if (IS_ERR(gpu->gpu_reg))
 642                 gpu->gpu_reg = NULL;
 643
 644         gpu->gpu_cx = devm_regulator_get(&pdev->dev, "vddcx");
 645         DBG("gpu_cx: %p", gpu->gpu_cx);
 646         if (IS_ERR(gpu->gpu_cx))
 647                 gpu->gpu_cx = NULL;
 648
 649         /* Setup IOMMU.. eventually we will (I think) do this once per context
 650          * and have separate page tables per context.  For now, to keep things
 651          * simple and to get something working, just use a single address space:
 652          */
 653         iommu = iommu_domain_alloc(&platform_bus_type);
 654         if (iommu) {
 655                 /* TODO 32b vs 64b address space.. */
 656                 iommu->geometry.aperture_start = SZ_16M;
 657                 iommu->geometry.aperture_end = 0xffffffff;
 658
 659                 dev_info(drm->dev, "%s: using IOMMU\n", name);
 660                 gpu->aspace = msm_gem_address_space_create(&pdev->dev,
 661                                 iommu, "gpu");
 662                 if (IS_ERR(gpu->aspace)) {
 663                         ret = PTR_ERR(gpu->aspace);
 664                         dev_err(drm->dev, "failed to init iommu: %d\n", ret);
 665                         gpu->aspace = NULL;
 666                         iommu_domain_free(iommu);
 667                         goto fail;
 668                 }
 669
 670         } else {
 671                 dev_info(drm->dev, "%s: no IOMMU, fallback to VRAM carveout!\n", name);
 672         }
 673         gpu->id = msm_register_address_space(drm, gpu->aspace);
 674
 675
 676         /* Create ringbuffer: */
 677         mutex_lock(&drm->struct_mutex);
 678         gpu->rb = msm_ringbuffer_new(gpu, ringsz);
 679         mutex_unlock(&drm->struct_mutex);
 680         if (IS_ERR(gpu->rb)) {
 681                 ret = PTR_ERR(gpu->rb);
 682                 gpu->rb = NULL;
 683                 dev_err(drm->dev, "could not create ringbuffer: %d\n", ret);
 684                 goto fail;
 685         }
 686
 687         bs_init(gpu);
 688
 689         return 0;
 690
 691 fail:
 692         return ret;
 693 }
 694
 695 void msm_gpu_cleanup(struct msm_gpu *gpu)
 696 {
 697         DBG("%s", gpu->name);
 698
 699         WARN_ON(!list_empty(&gpu->active_list));
 700
 701         bs_fini(gpu);
 702
 703         if (gpu->rb) {
 704                 if (gpu->rb_iova)
 705                         msm_gem_put_iova(gpu->rb->bo, gpu->id);
 706                 msm_ringbuffer_destroy(gpu->rb);
 707         }
 708
 709         if (gpu->fctx)
 710                 msm_fence_context_free(gpu->fctx);
 711 }