drivers/gpu/drm/vc4/vc4_v3d.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2014 The Linux Foundation. All rights reserved.
   4  * Copyright (C) 2013 Red Hat
   5  * Author: Rob Clark <robdclark@gmail.com>
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <linux/component.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/pm_runtime.h>
  12
  13 #include "vc4_drv.h"
  14 #include "vc4_regs.h"
  15
  16 static const struct debugfs_reg32 v3d_regs[] = {
  17         VC4_REG32(V3D_IDENT0),
  18         VC4_REG32(V3D_IDENT1),
  19         VC4_REG32(V3D_IDENT2),
  20         VC4_REG32(V3D_SCRATCH),
  21         VC4_REG32(V3D_L2CACTL),
  22         VC4_REG32(V3D_SLCACTL),
  23         VC4_REG32(V3D_INTCTL),
  24         VC4_REG32(V3D_INTENA),
  25         VC4_REG32(V3D_INTDIS),
  26         VC4_REG32(V3D_CT0CS),
  27         VC4_REG32(V3D_CT1CS),
  28         VC4_REG32(V3D_CT0EA),
  29         VC4_REG32(V3D_CT1EA),
  30         VC4_REG32(V3D_CT0CA),
  31         VC4_REG32(V3D_CT1CA),
  32         VC4_REG32(V3D_CT00RA0),
  33         VC4_REG32(V3D_CT01RA0),
  34         VC4_REG32(V3D_CT0LC),
  35         VC4_REG32(V3D_CT1LC),
  36         VC4_REG32(V3D_CT0PC),
  37         VC4_REG32(V3D_CT1PC),
  38         VC4_REG32(V3D_PCS),
  39         VC4_REG32(V3D_BFC),
  40         VC4_REG32(V3D_RFC),
  41         VC4_REG32(V3D_BPCA),
  42         VC4_REG32(V3D_BPCS),
  43         VC4_REG32(V3D_BPOA),
  44         VC4_REG32(V3D_BPOS),
  45         VC4_REG32(V3D_BXCF),
  46         VC4_REG32(V3D_SQRSV0),
  47         VC4_REG32(V3D_SQRSV1),
  48         VC4_REG32(V3D_SQCNTL),
  49         VC4_REG32(V3D_SRQPC),
  50         VC4_REG32(V3D_SRQUA),
  51         VC4_REG32(V3D_SRQUL),
  52         VC4_REG32(V3D_SRQCS),
  53         VC4_REG32(V3D_VPACNTL),
  54         VC4_REG32(V3D_VPMBASE),
  55         VC4_REG32(V3D_PCTRC),
  56         VC4_REG32(V3D_PCTRE),
  57         VC4_REG32(V3D_PCTR(0)),
  58         VC4_REG32(V3D_PCTRS(0)),
  59         VC4_REG32(V3D_PCTR(1)),
  60         VC4_REG32(V3D_PCTRS(1)),
  61         VC4_REG32(V3D_PCTR(2)),
  62         VC4_REG32(V3D_PCTRS(2)),
  63         VC4_REG32(V3D_PCTR(3)),
  64         VC4_REG32(V3D_PCTRS(3)),
  65         VC4_REG32(V3D_PCTR(4)),
  66         VC4_REG32(V3D_PCTRS(4)),
  67         VC4_REG32(V3D_PCTR(5)),
  68         VC4_REG32(V3D_PCTRS(5)),
  69         VC4_REG32(V3D_PCTR(6)),
  70         VC4_REG32(V3D_PCTRS(6)),
  71         VC4_REG32(V3D_PCTR(7)),
  72         VC4_REG32(V3D_PCTRS(7)),
  73         VC4_REG32(V3D_PCTR(8)),
  74         VC4_REG32(V3D_PCTRS(8)),
  75         VC4_REG32(V3D_PCTR(9)),
  76         VC4_REG32(V3D_PCTRS(9)),
  77         VC4_REG32(V3D_PCTR(10)),
  78         VC4_REG32(V3D_PCTRS(10)),
  79         VC4_REG32(V3D_PCTR(11)),
  80         VC4_REG32(V3D_PCTRS(11)),
  81         VC4_REG32(V3D_PCTR(12)),
  82         VC4_REG32(V3D_PCTRS(12)),
  83         VC4_REG32(V3D_PCTR(13)),
  84         VC4_REG32(V3D_PCTRS(13)),
  85         VC4_REG32(V3D_PCTR(14)),
  86         VC4_REG32(V3D_PCTRS(14)),
  87         VC4_REG32(V3D_PCTR(15)),
  88         VC4_REG32(V3D_PCTRS(15)),
  89         VC4_REG32(V3D_DBGE),
  90         VC4_REG32(V3D_FDBGO),
  91         VC4_REG32(V3D_FDBGB),
  92         VC4_REG32(V3D_FDBGR),
  93         VC4_REG32(V3D_FDBGS),
  94         VC4_REG32(V3D_ERRSTAT),
  95 };
  96
  97 static int vc4_v3d_debugfs_ident(struct seq_file *m, void *unused)
  98 {
  99         struct drm_debugfs_entry *entry = m->private;
 100         struct drm_device *dev = entry->dev;
 101         struct vc4_dev *vc4 = to_vc4_dev(dev);
 102         int ret = vc4_v3d_pm_get(vc4);
 103
 104         if (ret == 0) {
 105                 uint32_t ident1 = V3D_READ(V3D_IDENT1);
 106                 uint32_t nslc = VC4_GET_FIELD(ident1, V3D_IDENT1_NSLC);
 107                 uint32_t tups = VC4_GET_FIELD(ident1, V3D_IDENT1_TUPS);
 108                 uint32_t qups = VC4_GET_FIELD(ident1, V3D_IDENT1_QUPS);
 109
 110                 seq_printf(m, "Revision:   %d\n",
 111                            VC4_GET_FIELD(ident1, V3D_IDENT1_REV));
 112                 seq_printf(m, "Slices:     %d\n", nslc);
 113                 seq_printf(m, "TMUs:       %d\n", nslc * tups);
 114                 seq_printf(m, "QPUs:       %d\n", nslc * qups);
 115                 seq_printf(m, "Semaphores: %d\n",
 116                            VC4_GET_FIELD(ident1, V3D_IDENT1_NSEM));
 117                 vc4_v3d_pm_put(vc4);
 118         }
 119
 120         return 0;
 121 }
 122
 123 /*
 124  * Wraps pm_runtime_get_sync() in a refcount, so that we can reliably
 125  * get the pm_runtime refcount to 0 in vc4_reset().
 126  */
 127 int
 128 vc4_v3d_pm_get(struct vc4_dev *vc4)
 129 {
 130         if (WARN_ON_ONCE(vc4->gen > VC4_GEN_4))
 131                 return -ENODEV;
 132
 133         mutex_lock(&vc4->power_lock);
 134         if (vc4->power_refcount++ == 0) {
 135                 int ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev);
 136
 137                 if (ret < 0) {
 138                         vc4->power_refcount--;
 139                         mutex_unlock(&vc4->power_lock);
 140                         return ret;
 141                 }
 142         }
 143         mutex_unlock(&vc4->power_lock);
 144
 145         return 0;
 146 }
 147
 148 void
 149 vc4_v3d_pm_put(struct vc4_dev *vc4)
 150 {
 151         if (WARN_ON_ONCE(vc4->gen > VC4_GEN_4))
 152                 return;
 153
 154         mutex_lock(&vc4->power_lock);
 155         if (--vc4->power_refcount == 0) {
 156                 pm_runtime_mark_last_busy(&vc4->v3d->pdev->dev);
 157                 pm_runtime_put_autosuspend(&vc4->v3d->pdev->dev);
 158         }
 159         mutex_unlock(&vc4->power_lock);
 160 }
 161
 162 static void vc4_v3d_init_hw(struct drm_device *dev)
 163 {
 164         struct vc4_dev *vc4 = to_vc4_dev(dev);
 165
 166         /* Take all the memory that would have been reserved for user
 167          * QPU programs, since we don't have an interface for running
 168          * them, anyway.
 169          */
 170         V3D_WRITE(V3D_VPMBASE, 0);
 171 }
 172
 173 int vc4_v3d_get_bin_slot(struct vc4_dev *vc4)
 174 {
 175         struct drm_device *dev = &vc4->base;
 176         unsigned long irqflags;
 177         int slot;
 178         uint64_t seqno = 0;
 179         struct vc4_exec_info *exec;
 180
 181         if (WARN_ON_ONCE(vc4->gen > VC4_GEN_4))
 182                 return -ENODEV;
 183
 184 try_again:
 185         spin_lock_irqsave(&vc4->job_lock, irqflags);
 186         slot = ffs(~vc4->bin_alloc_used);
 187         if (slot != 0) {
 188                 /* Switch from ffs() bit index to a 0-based index. */
 189                 slot--;
 190                 vc4->bin_alloc_used |= BIT(slot);
 191                 spin_unlock_irqrestore(&vc4->job_lock, irqflags);
 192                 return slot;
 193         }
 194
 195         /* Couldn't find an open slot.  Wait for render to complete
 196          * and try again.
 197          */
 198         exec = vc4_last_render_job(vc4);
 199         if (exec)
 200                 seqno = exec->seqno;
 201         spin_unlock_irqrestore(&vc4->job_lock, irqflags);
 202
 203         if (seqno) {
 204                 int ret = vc4_wait_for_seqno(dev, seqno, ~0ull, true);
 205
 206                 if (ret == 0)
 207                         goto try_again;
 208
 209                 return ret;
 210         }
 211
 212         return -ENOMEM;
 213 }
 214
 215 /*
 216  * bin_bo_alloc() - allocates the memory that will be used for
 217  * tile binning.
 218  *
 219  * The binner has a limitation that the addresses in the tile state
 220  * buffer that point into the tile alloc buffer or binner overflow
 221  * memory only have 28 bits (256MB), and the top 4 on the bus for
 222  * tile alloc references end up coming from the tile state buffer's
 223  * address.
 224  *
 225  * To work around this, we allocate a single large buffer while V3D is
 226  * in use, make sure that it has the top 4 bits constant across its
 227  * entire extent, and then put the tile state, tile alloc, and binner
 228  * overflow memory inside that buffer.
 229  *
 230  * This creates a limitation where we may not be able to execute a job
 231  * if it doesn't fit within the buffer that we allocated up front.
 232  * However, it turns out that 16MB is "enough for anybody", and
 233  * real-world applications run into allocation failures from the
 234  * overall DMA pool before they make scenes complicated enough to run
 235  * out of bin space.
 236  */
 237 static int bin_bo_alloc(struct vc4_dev *vc4)
 238 {
 239         struct vc4_v3d *v3d = vc4->v3d;
 240         uint32_t size = 16 * 1024 * 1024;
 241         int ret = 0;
 242         struct list_head list;
 243
 244         if (!v3d)
 245                 return -ENODEV;
 246
 247         /* We may need to try allocating more than once to get a BO
 248          * that doesn't cross 256MB.  Track the ones we've allocated
 249          * that failed so far, so that we can free them when we've got
 250          * one that succeeded (if we freed them right away, our next
 251          * allocation would probably be the same chunk of memory).
 252          */
 253         INIT_LIST_HEAD(&list);
 254
 255         while (true) {
 256                 struct vc4_bo *bo = vc4_bo_create(&vc4->base, size, true,
 257                                                   VC4_BO_TYPE_BIN);
 258
 259                 if (IS_ERR(bo)) {
 260                         ret = PTR_ERR(bo);
 261
 262                         dev_err(&v3d->pdev->dev,
 263                                 "Failed to allocate memory for tile binning: "
 264                                 "%d. You may need to enable DMA or give it "
 265                                 "more memory.",
 266                                 ret);
 267                         break;
 268                 }
 269
 270                 /* Check if this BO won't trigger the addressing bug. */
 271                 if ((bo->base.dma_addr & 0xf0000000) ==
 272                     ((bo->base.dma_addr + bo->base.base.size - 1) & 0xf0000000)) {
 273                         vc4->bin_bo = bo;
 274
 275                         /* Set up for allocating 512KB chunks of
 276                          * binner memory.  The biggest allocation we
 277                          * need to do is for the initial tile alloc +
 278                          * tile state buffer.  We can render to a
 279                          * maximum of ((2048*2048) / (32*32) = 4096
 280                          * tiles in a frame (until we do floating
 281                          * point rendering, at which point it would be
 282                          * 8192).  Tile state is 48b/tile (rounded to
 283                          * a page), and tile alloc is 32b/tile
 284                          * (rounded to a page), plus a page of extra,
 285                          * for a total of 320kb for our worst-case.
 286                          * We choose 512kb so that it divides evenly
 287                          * into our 16MB, and the rest of the 512kb
 288                          * will be used as storage for the overflow
 289                          * from the initial 32b CL per bin.
 290                          */
 291                         vc4->bin_alloc_size = 512 * 1024;
 292                         vc4->bin_alloc_used = 0;
 293                         vc4->bin_alloc_overflow = 0;
 294                         WARN_ON_ONCE(sizeof(vc4->bin_alloc_used) * 8 !=
 295                                      bo->base.base.size / vc4->bin_alloc_size);
 296
 297                         kref_init(&vc4->bin_bo_kref);
 298
 299                         /* Enable the out-of-memory interrupt to set our
 300                          * newly-allocated binner BO, potentially from an
 301                          * already-pending-but-masked interrupt.
 302                          */
 303                         V3D_WRITE(V3D_INTENA, V3D_INT_OUTOMEM);
 304
 305                         break;
 306                 }
 307
 308                 /* Put it on the list to free later, and try again. */
 309                 list_add(&bo->unref_head, &list);
 310         }
 311
 312         /* Free all the BOs we allocated but didn't choose. */
 313         while (!list_empty(&list)) {
 314                 struct vc4_bo *bo = list_last_entry(&list,
 315                                                     struct vc4_bo, unref_head);
 316
 317                 list_del(&bo->unref_head);
 318                 drm_gem_object_put(&bo->base.base);
 319         }
 320
 321         return ret;
 322 }
 323
 324 int vc4_v3d_bin_bo_get(struct vc4_dev *vc4, bool *used)
 325 {
 326         int ret = 0;
 327
 328         if (WARN_ON_ONCE(vc4->gen > VC4_GEN_4))
 329                 return -ENODEV;
 330
 331         mutex_lock(&vc4->bin_bo_lock);
 332
 333         if (used && *used)
 334                 goto complete;
 335
 336         if (vc4->bin_bo)
 337                 kref_get(&vc4->bin_bo_kref);
 338         else
 339                 ret = bin_bo_alloc(vc4);
 340
 341         if (ret == 0 && used)
 342                 *used = true;
 343
 344 complete:
 345         mutex_unlock(&vc4->bin_bo_lock);
 346
 347         return ret;
 348 }
 349
 350 static void bin_bo_release(struct kref *ref)
 351 {
 352         struct vc4_dev *vc4 = container_of(ref, struct vc4_dev, bin_bo_kref);
 353
 354         if (WARN_ON_ONCE(!vc4->bin_bo))
 355                 return;
 356
 357         drm_gem_object_put(&vc4->bin_bo->base.base);
 358         vc4->bin_bo = NULL;
 359 }
 360
 361 void vc4_v3d_bin_bo_put(struct vc4_dev *vc4)
 362 {
 363         if (WARN_ON_ONCE(vc4->gen > VC4_GEN_4))
 364                 return;
 365
 366         mutex_lock(&vc4->bin_bo_lock);
 367         kref_put(&vc4->bin_bo_kref, bin_bo_release);
 368         mutex_unlock(&vc4->bin_bo_lock);
 369 }
 370
 371 #ifdef CONFIG_PM
 372 static int vc4_v3d_runtime_suspend(struct device *dev)
 373 {
 374         struct vc4_v3d *v3d = dev_get_drvdata(dev);
 375         struct vc4_dev *vc4 = v3d->vc4;
 376
 377         vc4_irq_disable(&vc4->base);
 378
 379         clk_disable_unprepare(v3d->clk);
 380
 381         return 0;
 382 }
 383
 384 static int vc4_v3d_runtime_resume(struct device *dev)
 385 {
 386         struct vc4_v3d *v3d = dev_get_drvdata(dev);
 387         struct vc4_dev *vc4 = v3d->vc4;
 388         int ret;
 389
 390         ret = clk_prepare_enable(v3d->clk);
 391         if (ret != 0)
 392                 return ret;
 393
 394         vc4_v3d_init_hw(&vc4->base);
 395
 396         vc4_irq_enable(&vc4->base);
 397
 398         return 0;
 399 }
 400 #endif
 401
 402 int vc4_v3d_debugfs_init(struct drm_minor *minor)
 403 {
 404         struct drm_device *drm = minor->dev;
 405         struct vc4_dev *vc4 = to_vc4_dev(drm);
 406         struct vc4_v3d *v3d = vc4->v3d;
 407
 408         if (!vc4->v3d)
 409                 return -ENODEV;
 410
 411         drm_debugfs_add_file(drm, "v3d_ident", vc4_v3d_debugfs_ident, NULL);
 412
 413         vc4_debugfs_add_regset32(drm, "v3d_regs", &v3d->regset);
 414
 415         return 0;
 416 }
 417
 418 static int vc4_v3d_bind(struct device *dev, struct device *master, void *data)
 419 {
 420         struct platform_device *pdev = to_platform_device(dev);
 421         struct drm_device *drm = dev_get_drvdata(master);
 422         struct vc4_dev *vc4 = to_vc4_dev(drm);
 423         struct vc4_v3d *v3d = NULL;
 424         int ret;
 425
 426         v3d = devm_kzalloc(&pdev->dev, sizeof(*v3d), GFP_KERNEL);
 427         if (!v3d)
 428                 return -ENOMEM;
 429
 430         dev_set_drvdata(dev, v3d);
 431
 432         v3d->pdev = pdev;
 433
 434         v3d->regs = vc4_ioremap_regs(pdev, 0);
 435         if (IS_ERR(v3d->regs))
 436                 return PTR_ERR(v3d->regs);
 437         v3d->regset.base = v3d->regs;
 438         v3d->regset.regs = v3d_regs;
 439         v3d->regset.nregs = ARRAY_SIZE(v3d_regs);
 440
 441         vc4->v3d = v3d;
 442         v3d->vc4 = vc4;
 443
 444         v3d->clk = devm_clk_get_optional(dev, NULL);
 445         if (IS_ERR(v3d->clk))
 446                 return dev_err_probe(dev, PTR_ERR(v3d->clk), "Failed to get V3D clock\n");
 447
 448         ret = platform_get_irq(pdev, 0);
 449         if (ret < 0)
 450                 return ret;
 451         vc4->irq = ret;
 452
 453         ret = devm_pm_runtime_enable(dev);
 454         if (ret)
 455                 return ret;
 456
 457         ret = pm_runtime_resume_and_get(dev);
 458         if (ret)
 459                 return ret;
 460
 461         if (V3D_READ(V3D_IDENT0) != V3D_EXPECTED_IDENT0) {
 462                 drm_err(drm, "V3D_IDENT0 read 0x%08x instead of 0x%08x\n",
 463                         V3D_READ(V3D_IDENT0), V3D_EXPECTED_IDENT0);
 464                 ret = -EINVAL;
 465                 goto err_put_runtime_pm;
 466         }
 467
 468         /* Reset the binner overflow address/size at setup, to be sure
 469          * we don't reuse an old one.
 470          */
 471         V3D_WRITE(V3D_BPOA, 0);
 472         V3D_WRITE(V3D_BPOS, 0);
 473
 474         ret = vc4_irq_install(drm, vc4->irq);
 475         if (ret) {
 476                 drm_err(drm, "Failed to install IRQ handler\n");
 477                 goto err_put_runtime_pm;
 478         }
 479
 480         pm_runtime_use_autosuspend(dev);
 481         pm_runtime_set_autosuspend_delay(dev, 40); /* a little over 2 frames. */
 482
 483         return 0;
 484
 485 err_put_runtime_pm:
 486         pm_runtime_put(dev);
 487
 488         return ret;
 489 }
 490
 491 static void vc4_v3d_unbind(struct device *dev, struct device *master,
 492                            void *data)
 493 {
 494         struct drm_device *drm = dev_get_drvdata(master);
 495         struct vc4_dev *vc4 = to_vc4_dev(drm);
 496
 497         vc4_irq_uninstall(drm);
 498
 499         /* Disable the binner's overflow memory address, so the next
 500          * driver probe (if any) doesn't try to reuse our old
 501          * allocation.
 502          */
 503         V3D_WRITE(V3D_BPOA, 0);
 504         V3D_WRITE(V3D_BPOS, 0);
 505
 506         vc4->v3d = NULL;
 507 }
 508
 509 static const struct dev_pm_ops vc4_v3d_pm_ops = {
 510         SET_RUNTIME_PM_OPS(vc4_v3d_runtime_suspend, vc4_v3d_runtime_resume, NULL)
 511 };
 512
 513 static const struct component_ops vc4_v3d_ops = {
 514         .bind   = vc4_v3d_bind,
 515         .unbind = vc4_v3d_unbind,
 516 };
 517
 518 static int vc4_v3d_dev_probe(struct platform_device *pdev)
 519 {
 520         return component_add(&pdev->dev, &vc4_v3d_ops);
 521 }
 522
 523 static void vc4_v3d_dev_remove(struct platform_device *pdev)
 524 {
 525         component_del(&pdev->dev, &vc4_v3d_ops);
 526 }
 527
 528 const struct of_device_id vc4_v3d_dt_match[] = {
 529         { .compatible = "brcm,bcm2835-v3d" },
 530         { .compatible = "brcm,cygnus-v3d" },
 531         { .compatible = "brcm,vc4-v3d" },
 532         {}
 533 };
 534
 535 struct platform_driver vc4_v3d_driver = {
 536         .probe = vc4_v3d_dev_probe,
 537         .remove = vc4_v3d_dev_remove,
 538         .driver = {
 539                 .name = "vc4_v3d",
 540                 .of_match_table = vc4_v3d_dt_match,
 541                 .pm = &vc4_v3d_pm_ops,
 542         },
 543 };