linux/drivers/gpu/drm/qxl/qxl_ttm.c
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   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: Dave Airlie
  23 *          Alon Levy
  24 */
  25
  26#include <drm/ttm/ttm_bo_api.h>
  27#include <drm/ttm/ttm_bo_driver.h>
  28#include <drm/ttm/ttm_placement.h>
  29#include <drm/ttm/ttm_page_alloc.h>
  30#include <drm/ttm/ttm_module.h>
  31#include <drm/drmP.h>
  32#include <drm/drm.h>
  33#include <drm/qxl_drm.h>
  34#include "qxl_drv.h"
  35#include "qxl_object.h"
  36
  37#include <linux/delay.h>
  38
  39static struct qxl_device *qxl_get_qdev(struct ttm_bo_device *bdev)
  40{
  41        struct qxl_mman *mman;
  42        struct qxl_device *qdev;
  43
  44        mman = container_of(bdev, struct qxl_mman, bdev);
  45        qdev = container_of(mman, struct qxl_device, mman);
  46        return qdev;
  47}
  48
  49static int qxl_ttm_mem_global_init(struct drm_global_reference *ref)
  50{
  51        return ttm_mem_global_init(ref->object);
  52}
  53
  54static void qxl_ttm_mem_global_release(struct drm_global_reference *ref)
  55{
  56        ttm_mem_global_release(ref->object);
  57}
  58
  59static int qxl_ttm_global_init(struct qxl_device *qdev)
  60{
  61        struct drm_global_reference *global_ref;
  62        int r;
  63
  64        qdev->mman.mem_global_referenced = false;
  65        global_ref = &qdev->mman.mem_global_ref;
  66        global_ref->global_type = DRM_GLOBAL_TTM_MEM;
  67        global_ref->size = sizeof(struct ttm_mem_global);
  68        global_ref->init = &qxl_ttm_mem_global_init;
  69        global_ref->release = &qxl_ttm_mem_global_release;
  70
  71        r = drm_global_item_ref(global_ref);
  72        if (r != 0) {
  73                DRM_ERROR("Failed setting up TTM memory accounting "
  74                          "subsystem.\n");
  75                return r;
  76        }
  77
  78        qdev->mman.bo_global_ref.mem_glob =
  79                qdev->mman.mem_global_ref.object;
  80        global_ref = &qdev->mman.bo_global_ref.ref;
  81        global_ref->global_type = DRM_GLOBAL_TTM_BO;
  82        global_ref->size = sizeof(struct ttm_bo_global);
  83        global_ref->init = &ttm_bo_global_init;
  84        global_ref->release = &ttm_bo_global_release;
  85        r = drm_global_item_ref(global_ref);
  86        if (r != 0) {
  87                DRM_ERROR("Failed setting up TTM BO subsystem.\n");
  88                drm_global_item_unref(&qdev->mman.mem_global_ref);
  89                return r;
  90        }
  91
  92        qdev->mman.mem_global_referenced = true;
  93        return 0;
  94}
  95
  96static void qxl_ttm_global_fini(struct qxl_device *qdev)
  97{
  98        if (qdev->mman.mem_global_referenced) {
  99                drm_global_item_unref(&qdev->mman.bo_global_ref.ref);
 100                drm_global_item_unref(&qdev->mman.mem_global_ref);
 101                qdev->mman.mem_global_referenced = false;
 102        }
 103}
 104
 105static struct vm_operations_struct qxl_ttm_vm_ops;
 106static const struct vm_operations_struct *ttm_vm_ops;
 107
 108static int qxl_ttm_fault(struct vm_fault *vmf)
 109{
 110        struct ttm_buffer_object *bo;
 111        int r;
 112
 113        bo = (struct ttm_buffer_object *)vmf->vma->vm_private_data;
 114        if (bo == NULL)
 115                return VM_FAULT_NOPAGE;
 116        r = ttm_vm_ops->fault(vmf);
 117        return r;
 118}
 119
 120int qxl_mmap(struct file *filp, struct vm_area_struct *vma)
 121{
 122        struct drm_file *file_priv;
 123        struct qxl_device *qdev;
 124        int r;
 125
 126        if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET)) {
 127                pr_info("%s: vma->vm_pgoff (%ld) < DRM_FILE_PAGE_OFFSET\n",
 128                        __func__, vma->vm_pgoff);
 129                return -EINVAL;
 130        }
 131
 132        file_priv = filp->private_data;
 133        qdev = file_priv->minor->dev->dev_private;
 134        if (qdev == NULL) {
 135                DRM_ERROR(
 136                 "filp->private_data->minor->dev->dev_private == NULL\n");
 137                return -EINVAL;
 138        }
 139        QXL_INFO(qdev, "%s: filp->private_data = 0x%p, vma->vm_pgoff = %lx\n",
 140                 __func__, filp->private_data, vma->vm_pgoff);
 141
 142        r = ttm_bo_mmap(filp, vma, &qdev->mman.bdev);
 143        if (unlikely(r != 0))
 144                return r;
 145        if (unlikely(ttm_vm_ops == NULL)) {
 146                ttm_vm_ops = vma->vm_ops;
 147                qxl_ttm_vm_ops = *ttm_vm_ops;
 148                qxl_ttm_vm_ops.fault = &qxl_ttm_fault;
 149        }
 150        vma->vm_ops = &qxl_ttm_vm_ops;
 151        return 0;
 152}
 153
 154static int qxl_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
 155{
 156        return 0;
 157}
 158
 159static int qxl_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
 160                             struct ttm_mem_type_manager *man)
 161{
 162        switch (type) {
 163        case TTM_PL_SYSTEM:
 164                /* System memory */
 165                man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
 166                man->available_caching = TTM_PL_MASK_CACHING;
 167                man->default_caching = TTM_PL_FLAG_CACHED;
 168                break;
 169        case TTM_PL_VRAM:
 170        case TTM_PL_PRIV:
 171                /* "On-card" video ram */
 172                man->func = &ttm_bo_manager_func;
 173                man->gpu_offset = 0;
 174                man->flags = TTM_MEMTYPE_FLAG_FIXED |
 175                             TTM_MEMTYPE_FLAG_MAPPABLE;
 176                man->available_caching = TTM_PL_MASK_CACHING;
 177                man->default_caching = TTM_PL_FLAG_CACHED;
 178                break;
 179        default:
 180                DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
 181                return -EINVAL;
 182        }
 183        return 0;
 184}
 185
 186static void qxl_evict_flags(struct ttm_buffer_object *bo,
 187                                struct ttm_placement *placement)
 188{
 189        struct qxl_bo *qbo;
 190        static struct ttm_place placements = {
 191                .fpfn = 0,
 192                .lpfn = 0,
 193                .flags = TTM_PL_MASK_CACHING | TTM_PL_FLAG_SYSTEM
 194        };
 195
 196        if (!qxl_ttm_bo_is_qxl_bo(bo)) {
 197                placement->placement = &placements;
 198                placement->busy_placement = &placements;
 199                placement->num_placement = 1;
 200                placement->num_busy_placement = 1;
 201                return;
 202        }
 203        qbo = to_qxl_bo(bo);
 204        qxl_ttm_placement_from_domain(qbo, QXL_GEM_DOMAIN_CPU, false);
 205        *placement = qbo->placement;
 206}
 207
 208static int qxl_verify_access(struct ttm_buffer_object *bo, struct file *filp)
 209{
 210        struct qxl_bo *qbo = to_qxl_bo(bo);
 211
 212        return drm_vma_node_verify_access(&qbo->gem_base.vma_node,
 213                                          filp->private_data);
 214}
 215
 216static int qxl_ttm_io_mem_reserve(struct ttm_bo_device *bdev,
 217                                  struct ttm_mem_reg *mem)
 218{
 219        struct ttm_mem_type_manager *man = &bdev->man[mem->mem_type];
 220        struct qxl_device *qdev = qxl_get_qdev(bdev);
 221
 222        mem->bus.addr = NULL;
 223        mem->bus.offset = 0;
 224        mem->bus.size = mem->num_pages << PAGE_SHIFT;
 225        mem->bus.base = 0;
 226        mem->bus.is_iomem = false;
 227        if (!(man->flags & TTM_MEMTYPE_FLAG_MAPPABLE))
 228                return -EINVAL;
 229        switch (mem->mem_type) {
 230        case TTM_PL_SYSTEM:
 231                /* system memory */
 232                return 0;
 233        case TTM_PL_VRAM:
 234                mem->bus.is_iomem = true;
 235                mem->bus.base = qdev->vram_base;
 236                mem->bus.offset = mem->start << PAGE_SHIFT;
 237                break;
 238        case TTM_PL_PRIV:
 239                mem->bus.is_iomem = true;
 240                mem->bus.base = qdev->surfaceram_base;
 241                mem->bus.offset = mem->start << PAGE_SHIFT;
 242                break;
 243        default:
 244                return -EINVAL;
 245        }
 246        return 0;
 247}
 248
 249static void qxl_ttm_io_mem_free(struct ttm_bo_device *bdev,
 250                                struct ttm_mem_reg *mem)
 251{
 252}
 253
 254/*
 255 * TTM backend functions.
 256 */
 257struct qxl_ttm_tt {
 258        struct ttm_dma_tt               ttm;
 259        struct qxl_device               *qdev;
 260        u64                             offset;
 261};
 262
 263static int qxl_ttm_backend_bind(struct ttm_tt *ttm,
 264                                struct ttm_mem_reg *bo_mem)
 265{
 266        struct qxl_ttm_tt *gtt = (void *)ttm;
 267
 268        gtt->offset = (unsigned long)(bo_mem->start << PAGE_SHIFT);
 269        if (!ttm->num_pages) {
 270                WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n",
 271                     ttm->num_pages, bo_mem, ttm);
 272        }
 273        /* Not implemented */
 274        return -1;
 275}
 276
 277static int qxl_ttm_backend_unbind(struct ttm_tt *ttm)
 278{
 279        /* Not implemented */
 280        return -1;
 281}
 282
 283static void qxl_ttm_backend_destroy(struct ttm_tt *ttm)
 284{
 285        struct qxl_ttm_tt *gtt = (void *)ttm;
 286
 287        ttm_dma_tt_fini(&gtt->ttm);
 288        kfree(gtt);
 289}
 290
 291static struct ttm_backend_func qxl_backend_func = {
 292        .bind = &qxl_ttm_backend_bind,
 293        .unbind = &qxl_ttm_backend_unbind,
 294        .destroy = &qxl_ttm_backend_destroy,
 295};
 296
 297static int qxl_ttm_tt_populate(struct ttm_tt *ttm)
 298{
 299        int r;
 300
 301        if (ttm->state != tt_unpopulated)
 302                return 0;
 303
 304        r = ttm_pool_populate(ttm);
 305        if (r)
 306                return r;
 307
 308        return 0;
 309}
 310
 311static void qxl_ttm_tt_unpopulate(struct ttm_tt *ttm)
 312{
 313        ttm_pool_unpopulate(ttm);
 314}
 315
 316static struct ttm_tt *qxl_ttm_tt_create(struct ttm_bo_device *bdev,
 317                                        unsigned long size, uint32_t page_flags,
 318                                        struct page *dummy_read_page)
 319{
 320        struct qxl_device *qdev;
 321        struct qxl_ttm_tt *gtt;
 322
 323        qdev = qxl_get_qdev(bdev);
 324        gtt = kzalloc(sizeof(struct qxl_ttm_tt), GFP_KERNEL);
 325        if (gtt == NULL)
 326                return NULL;
 327        gtt->ttm.ttm.func = &qxl_backend_func;
 328        gtt->qdev = qdev;
 329        if (ttm_dma_tt_init(&gtt->ttm, bdev, size, page_flags,
 330                            dummy_read_page)) {
 331                kfree(gtt);
 332                return NULL;
 333        }
 334        return &gtt->ttm.ttm;
 335}
 336
 337static void qxl_move_null(struct ttm_buffer_object *bo,
 338                             struct ttm_mem_reg *new_mem)
 339{
 340        struct ttm_mem_reg *old_mem = &bo->mem;
 341
 342        BUG_ON(old_mem->mm_node != NULL);
 343        *old_mem = *new_mem;
 344        new_mem->mm_node = NULL;
 345}
 346
 347static int qxl_bo_move(struct ttm_buffer_object *bo,
 348                       bool evict, bool interruptible,
 349                       bool no_wait_gpu,
 350                       struct ttm_mem_reg *new_mem)
 351{
 352        struct ttm_mem_reg *old_mem = &bo->mem;
 353        int ret;
 354
 355        ret = ttm_bo_wait(bo, interruptible, no_wait_gpu);
 356        if (ret)
 357                return ret;
 358
 359
 360        if (old_mem->mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
 361                qxl_move_null(bo, new_mem);
 362                return 0;
 363        }
 364        return ttm_bo_move_memcpy(bo, interruptible, no_wait_gpu,
 365                                  new_mem);
 366}
 367
 368static void qxl_bo_move_notify(struct ttm_buffer_object *bo,
 369                               bool evict,
 370                               struct ttm_mem_reg *new_mem)
 371{
 372        struct qxl_bo *qbo;
 373        struct qxl_device *qdev;
 374
 375        if (!qxl_ttm_bo_is_qxl_bo(bo))
 376                return;
 377        qbo = to_qxl_bo(bo);
 378        qdev = qbo->gem_base.dev->dev_private;
 379
 380        if (bo->mem.mem_type == TTM_PL_PRIV && qbo->surface_id)
 381                qxl_surface_evict(qdev, qbo, new_mem ? true : false);
 382}
 383
 384static struct ttm_bo_driver qxl_bo_driver = {
 385        .ttm_tt_create = &qxl_ttm_tt_create,
 386        .ttm_tt_populate = &qxl_ttm_tt_populate,
 387        .ttm_tt_unpopulate = &qxl_ttm_tt_unpopulate,
 388        .invalidate_caches = &qxl_invalidate_caches,
 389        .init_mem_type = &qxl_init_mem_type,
 390        .eviction_valuable = ttm_bo_eviction_valuable,
 391        .evict_flags = &qxl_evict_flags,
 392        .move = &qxl_bo_move,
 393        .verify_access = &qxl_verify_access,
 394        .io_mem_reserve = &qxl_ttm_io_mem_reserve,
 395        .io_mem_free = &qxl_ttm_io_mem_free,
 396        .io_mem_pfn = ttm_bo_default_io_mem_pfn,
 397        .move_notify = &qxl_bo_move_notify,
 398};
 399
 400int qxl_ttm_init(struct qxl_device *qdev)
 401{
 402        int r;
 403        int num_io_pages; /* != rom->num_io_pages, we include surface0 */
 404
 405        r = qxl_ttm_global_init(qdev);
 406        if (r)
 407                return r;
 408        /* No others user of address space so set it to 0 */
 409        r = ttm_bo_device_init(&qdev->mman.bdev,
 410                               qdev->mman.bo_global_ref.ref.object,
 411                               &qxl_bo_driver,
 412                               qdev->ddev.anon_inode->i_mapping,
 413                               DRM_FILE_PAGE_OFFSET, 0);
 414        if (r) {
 415                DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
 416                return r;
 417        }
 418        /* NOTE: this includes the framebuffer (aka surface 0) */
 419        num_io_pages = qdev->rom->ram_header_offset / PAGE_SIZE;
 420        r = ttm_bo_init_mm(&qdev->mman.bdev, TTM_PL_VRAM,
 421                           num_io_pages);
 422        if (r) {
 423                DRM_ERROR("Failed initializing VRAM heap.\n");
 424                return r;
 425        }
 426        r = ttm_bo_init_mm(&qdev->mman.bdev, TTM_PL_PRIV,
 427                           qdev->surfaceram_size / PAGE_SIZE);
 428        if (r) {
 429                DRM_ERROR("Failed initializing Surfaces heap.\n");
 430                return r;
 431        }
 432        DRM_INFO("qxl: %uM of VRAM memory size\n",
 433                 (unsigned)qdev->vram_size / (1024 * 1024));
 434        DRM_INFO("qxl: %luM of IO pages memory ready (VRAM domain)\n",
 435                 ((unsigned)num_io_pages * PAGE_SIZE) / (1024 * 1024));
 436        DRM_INFO("qxl: %uM of Surface memory size\n",
 437                 (unsigned)qdev->surfaceram_size / (1024 * 1024));
 438        return 0;
 439}
 440
 441void qxl_ttm_fini(struct qxl_device *qdev)
 442{
 443        ttm_bo_clean_mm(&qdev->mman.bdev, TTM_PL_VRAM);
 444        ttm_bo_clean_mm(&qdev->mman.bdev, TTM_PL_PRIV);
 445        ttm_bo_device_release(&qdev->mman.bdev);
 446        qxl_ttm_global_fini(qdev);
 447        DRM_INFO("qxl: ttm finalized\n");
 448}
 449
 450
 451#define QXL_DEBUGFS_MEM_TYPES 2
 452
 453#if defined(CONFIG_DEBUG_FS)
 454static int qxl_mm_dump_table(struct seq_file *m, void *data)
 455{
 456        struct drm_info_node *node = (struct drm_info_node *)m->private;
 457        struct drm_mm *mm = (struct drm_mm *)node->info_ent->data;
 458        struct drm_device *dev = node->minor->dev;
 459        struct qxl_device *rdev = dev->dev_private;
 460        struct ttm_bo_global *glob = rdev->mman.bdev.glob;
 461        struct drm_printer p = drm_seq_file_printer(m);
 462
 463        spin_lock(&glob->lru_lock);
 464        drm_mm_print(mm, &p);
 465        spin_unlock(&glob->lru_lock);
 466        return 0;
 467}
 468#endif
 469
 470int qxl_ttm_debugfs_init(struct qxl_device *qdev)
 471{
 472#if defined(CONFIG_DEBUG_FS)
 473        static struct drm_info_list qxl_mem_types_list[QXL_DEBUGFS_MEM_TYPES];
 474        static char qxl_mem_types_names[QXL_DEBUGFS_MEM_TYPES][32];
 475        unsigned i;
 476
 477        for (i = 0; i < QXL_DEBUGFS_MEM_TYPES; i++) {
 478                if (i == 0)
 479                        sprintf(qxl_mem_types_names[i], "qxl_mem_mm");
 480                else
 481                        sprintf(qxl_mem_types_names[i], "qxl_surf_mm");
 482                qxl_mem_types_list[i].name = qxl_mem_types_names[i];
 483                qxl_mem_types_list[i].show = &qxl_mm_dump_table;
 484                qxl_mem_types_list[i].driver_features = 0;
 485                if (i == 0)
 486                        qxl_mem_types_list[i].data = qdev->mman.bdev.man[TTM_PL_VRAM].priv;
 487                else
 488                        qxl_mem_types_list[i].data = qdev->mman.bdev.man[TTM_PL_PRIV].priv;
 489
 490        }
 491        return qxl_debugfs_add_files(qdev, qxl_mem_types_list, i);
 492#else
 493        return 0;
 494#endif
 495}
 496