Full support for Ginger Console

[linux-ginger.git] / drivers / gpu / drm / radeon / radeon_ttm.c

/*
 * Copyright 2009 Jerome Glisse.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 */
/*
 * Authors:
 *    Jerome Glisse <glisse@freedesktop.org>
 *    Thomas Hellstrom <thomas-at-tungstengraphics-dot-com>
 *    Dave Airlie
 */
#include <ttm/ttm_bo_api.h>
#include <ttm/ttm_bo_driver.h>
#include <ttm/ttm_placement.h>
#include <ttm/ttm_module.h>
#include <drm/drmP.h>
#include <drm/radeon_drm.h>
#include <linux/seq_file.h>
#include "radeon_reg.h"
#include "radeon.h"

#define DRM_FILE_PAGE_OFFSET (0x100000000ULL >> PAGE_SHIFT)

static int radeon_ttm_debugfs_init(struct radeon_device *rdev);

static struct radeon_device *radeon_get_rdev(struct ttm_bo_device *bdev)
{
        struct radeon_mman *mman;
        struct radeon_device *rdev;

        mman = container_of(bdev, struct radeon_mman, bdev);
        rdev = container_of(mman, struct radeon_device, mman);
        return rdev;
}


/*
 * Global memory.
 */
static int radeon_ttm_mem_global_init(struct ttm_global_reference *ref)
{
        return ttm_mem_global_init(ref->object);
}

static void radeon_ttm_mem_global_release(struct ttm_global_reference *ref)
{
        ttm_mem_global_release(ref->object);
}

static int radeon_ttm_global_init(struct radeon_device *rdev)
{
        struct ttm_global_reference *global_ref;
        int r;

        rdev->mman.mem_global_referenced = false;
        global_ref = &rdev->mman.mem_global_ref;
        global_ref->global_type = TTM_GLOBAL_TTM_MEM;
        global_ref->size = sizeof(struct ttm_mem_global);
        global_ref->init = &radeon_ttm_mem_global_init;
        global_ref->release = &radeon_ttm_mem_global_release;
        r = ttm_global_item_ref(global_ref);
        if (r != 0) {
                DRM_ERROR("Failed setting up TTM memory accounting "
                          "subsystem.\n");
                return r;
        }

        rdev->mman.bo_global_ref.mem_glob =
                rdev->mman.mem_global_ref.object;
        global_ref = &rdev->mman.bo_global_ref.ref;
        global_ref->global_type = TTM_GLOBAL_TTM_BO;
        global_ref->size = sizeof(struct ttm_bo_global);
        global_ref->init = &ttm_bo_global_init;
        global_ref->release = &ttm_bo_global_release;
        r = ttm_global_item_ref(global_ref);
        if (r != 0) {
                DRM_ERROR("Failed setting up TTM BO subsystem.\n");
                ttm_global_item_unref(&rdev->mman.mem_global_ref);
                return r;
        }

        rdev->mman.mem_global_referenced = true;
        return 0;
}

static void radeon_ttm_global_fini(struct radeon_device *rdev)
{
        if (rdev->mman.mem_global_referenced) {
                ttm_global_item_unref(&rdev->mman.bo_global_ref.ref);
                ttm_global_item_unref(&rdev->mman.mem_global_ref);
                rdev->mman.mem_global_referenced = false;
        }
}

struct ttm_backend *radeon_ttm_backend_create(struct radeon_device *rdev);

static struct ttm_backend*
radeon_create_ttm_backend_entry(struct ttm_bo_device *bdev)
{
        struct radeon_device *rdev;

        rdev = radeon_get_rdev(bdev);
#if __OS_HAS_AGP
        if (rdev->flags & RADEON_IS_AGP) {
                return ttm_agp_backend_init(bdev, rdev->ddev->agp->bridge);
        } else
#endif
        {
                return radeon_ttm_backend_create(rdev);
        }
}

static int radeon_invalidate_caches(struct ttm_bo_device *bdev, uint32_t flags)
{
        return 0;
}

static int radeon_init_mem_type(struct ttm_bo_device *bdev, uint32_t type,
                                struct ttm_mem_type_manager *man)
{
        struct radeon_device *rdev;

        rdev = radeon_get_rdev(bdev);

        switch (type) {
        case TTM_PL_SYSTEM:
                /* System memory */
                man->flags = TTM_MEMTYPE_FLAG_MAPPABLE;
                man->available_caching = TTM_PL_MASK_CACHING;
                man->default_caching = TTM_PL_FLAG_CACHED;
                break;
        case TTM_PL_TT:
                man->gpu_offset = 0;
                man->available_caching = TTM_PL_MASK_CACHING;
                man->default_caching = TTM_PL_FLAG_CACHED;
                man->flags = TTM_MEMTYPE_FLAG_MAPPABLE | TTM_MEMTYPE_FLAG_CMA;
#if __OS_HAS_AGP
                if (rdev->flags & RADEON_IS_AGP) {
                        if (!(drm_core_has_AGP(rdev->ddev) && rdev->ddev->agp)) {
                                DRM_ERROR("AGP is not enabled for memory type %u\n",
                                          (unsigned)type);
                                return -EINVAL;
                        }
                        man->io_offset = rdev->mc.agp_base;
                        man->io_size = rdev->mc.gtt_size;
                        man->io_addr = NULL;
                        if (!rdev->ddev->agp->cant_use_aperture)
                                man->flags = TTM_MEMTYPE_FLAG_NEEDS_IOREMAP |
                                             TTM_MEMTYPE_FLAG_MAPPABLE;
                        man->available_caching = TTM_PL_FLAG_UNCACHED |
                                                 TTM_PL_FLAG_WC;
                        man->default_caching = TTM_PL_FLAG_WC;
                } else
#endif
                {
                        man->io_offset = 0;
                        man->io_size = 0;
                        man->io_addr = NULL;
                }
                break;
        case TTM_PL_VRAM:
                /* "On-card" video ram */
                man->gpu_offset = 0;
                man->flags = TTM_MEMTYPE_FLAG_FIXED |
                             TTM_MEMTYPE_FLAG_NEEDS_IOREMAP |
                             TTM_MEMTYPE_FLAG_MAPPABLE;
                man->available_caching = TTM_PL_FLAG_UNCACHED | TTM_PL_FLAG_WC;
                man->default_caching = TTM_PL_FLAG_WC;
                man->io_addr = NULL;
                man->io_offset = rdev->mc.aper_base;
                man->io_size = rdev->mc.aper_size;
                break;
        default:
                DRM_ERROR("Unsupported memory type %u\n", (unsigned)type);
                return -EINVAL;
        }
        return 0;
}

static uint32_t radeon_evict_flags(struct ttm_buffer_object *bo)
{
        uint32_t cur_placement = bo->mem.placement & ~TTM_PL_MASK_MEMTYPE;

        switch (bo->mem.mem_type) {
        default:
                return (cur_placement & ~TTM_PL_MASK_CACHING) |
                        TTM_PL_FLAG_SYSTEM |
                        TTM_PL_FLAG_CACHED;
        }
}

static int radeon_verify_access(struct ttm_buffer_object *bo, struct file *filp)
{
        return 0;
}

static void radeon_move_null(struct ttm_buffer_object *bo,
                             struct ttm_mem_reg *new_mem)
{
        struct ttm_mem_reg *old_mem = &bo->mem;

        BUG_ON(old_mem->mm_node != NULL);
        *old_mem = *new_mem;
        new_mem->mm_node = NULL;
}

static int radeon_move_blit(struct ttm_buffer_object *bo,
                            bool evict, int no_wait,
                            struct ttm_mem_reg *new_mem,
                            struct ttm_mem_reg *old_mem)
{
        struct radeon_device *rdev;
        uint64_t old_start, new_start;
        struct radeon_fence *fence;
        int r;

        rdev = radeon_get_rdev(bo->bdev);
        r = radeon_fence_create(rdev, &fence);
        if (unlikely(r)) {
                return r;
        }
        old_start = old_mem->mm_node->start << PAGE_SHIFT;
        new_start = new_mem->mm_node->start << PAGE_SHIFT;

        switch (old_mem->mem_type) {
        case TTM_PL_VRAM:
                old_start += rdev->mc.vram_location;
                break;
        case TTM_PL_TT:
                old_start += rdev->mc.gtt_location;
                break;
        default:
                DRM_ERROR("Unknown placement %d\n", old_mem->mem_type);
                return -EINVAL;
        }
        switch (new_mem->mem_type) {
        case TTM_PL_VRAM:
                new_start += rdev->mc.vram_location;
                break;
        case TTM_PL_TT:
                new_start += rdev->mc.gtt_location;
                break;
        default:
                DRM_ERROR("Unknown placement %d\n", old_mem->mem_type);
                return -EINVAL;
        }
        if (!rdev->cp.ready) {
                DRM_ERROR("Trying to move memory with CP turned off.\n");
                return -EINVAL;
        }
        r = radeon_copy(rdev, old_start, new_start, new_mem->num_pages, fence);
        /* FIXME: handle copy error */
        r = ttm_bo_move_accel_cleanup(bo, (void *)fence, NULL,
                                      evict, no_wait, new_mem);
        radeon_fence_unref(&fence);
        return r;
}

static int radeon_move_vram_ram(struct ttm_buffer_object *bo,
                                bool evict, bool interruptible, bool no_wait,
                                struct ttm_mem_reg *new_mem)
{
        struct radeon_device *rdev;
        struct ttm_mem_reg *old_mem = &bo->mem;
        struct ttm_mem_reg tmp_mem;
        uint32_t proposed_placement;
        int r;

        rdev = radeon_get_rdev(bo->bdev);
        tmp_mem = *new_mem;
        tmp_mem.mm_node = NULL;
        proposed_placement = TTM_PL_FLAG_TT | TTM_PL_MASK_CACHING;
        r = ttm_bo_mem_space(bo, proposed_placement, &tmp_mem,
                             interruptible, no_wait);
        if (unlikely(r)) {
                return r;
        }
        r = ttm_tt_bind(bo->ttm, &tmp_mem);
        if (unlikely(r)) {
                goto out_cleanup;
        }
        r = radeon_move_blit(bo, true, no_wait, &tmp_mem, old_mem);
        if (unlikely(r)) {
                goto out_cleanup;
        }
        r = ttm_bo_move_ttm(bo, true, no_wait, new_mem);
out_cleanup:
        if (tmp_mem.mm_node) {
                struct ttm_bo_global *glob = rdev->mman.bdev.glob;

                spin_lock(&glob->lru_lock);
                drm_mm_put_block(tmp_mem.mm_node);
                spin_unlock(&glob->lru_lock);
                return r;
        }
        return r;
}

static int radeon_move_ram_vram(struct ttm_buffer_object *bo,
                                bool evict, bool interruptible, bool no_wait,
                                struct ttm_mem_reg *new_mem)
{
        struct radeon_device *rdev;
        struct ttm_mem_reg *old_mem = &bo->mem;
        struct ttm_mem_reg tmp_mem;
        uint32_t proposed_flags;
        int r;

        rdev = radeon_get_rdev(bo->bdev);
        tmp_mem = *new_mem;
        tmp_mem.mm_node = NULL;
        proposed_flags = TTM_PL_FLAG_TT | TTM_PL_MASK_CACHING;
        r = ttm_bo_mem_space(bo, proposed_flags, &tmp_mem,
                             interruptible, no_wait);
        if (unlikely(r)) {
                return r;
        }
        r = ttm_bo_move_ttm(bo, true, no_wait, &tmp_mem);
        if (unlikely(r)) {
                goto out_cleanup;
        }
        r = radeon_move_blit(bo, true, no_wait, new_mem, old_mem);
        if (unlikely(r)) {
                goto out_cleanup;
        }
out_cleanup:
        if (tmp_mem.mm_node) {
                struct ttm_bo_global *glob = rdev->mman.bdev.glob;

                spin_lock(&glob->lru_lock);
                drm_mm_put_block(tmp_mem.mm_node);
                spin_unlock(&glob->lru_lock);
                return r;
        }
        return r;
}

static int radeon_bo_move(struct ttm_buffer_object *bo,
                          bool evict, bool interruptible, bool no_wait,
                          struct ttm_mem_reg *new_mem)
{
        struct radeon_device *rdev;
        struct ttm_mem_reg *old_mem = &bo->mem;
        int r;

        rdev = radeon_get_rdev(bo->bdev);
        if (old_mem->mem_type == TTM_PL_SYSTEM && bo->ttm == NULL) {
                radeon_move_null(bo, new_mem);
                return 0;
        }
        if ((old_mem->mem_type == TTM_PL_TT &&
             new_mem->mem_type == TTM_PL_SYSTEM) ||
            (old_mem->mem_type == TTM_PL_SYSTEM &&
             new_mem->mem_type == TTM_PL_TT)) {
                /* bind is enought */
                radeon_move_null(bo, new_mem);
                return 0;
        }
        if (!rdev->cp.ready || rdev->asic->copy == NULL) {
                /* use memcpy */
                goto memcpy;
        }

        if (old_mem->mem_type == TTM_PL_VRAM &&
            new_mem->mem_type == TTM_PL_SYSTEM) {
                r = radeon_move_vram_ram(bo, evict, interruptible,
                                            no_wait, new_mem);
        } else if (old_mem->mem_type == TTM_PL_SYSTEM &&
                   new_mem->mem_type == TTM_PL_VRAM) {
                r = radeon_move_ram_vram(bo, evict, interruptible,
                                            no_wait, new_mem);
        } else {
                r = radeon_move_blit(bo, evict, no_wait, new_mem, old_mem);
        }

        if (r) {
memcpy:
                r = ttm_bo_move_memcpy(bo, evict, no_wait, new_mem);
        }

        return r;
}

const uint32_t radeon_mem_prios[] = {
        TTM_PL_VRAM,
        TTM_PL_TT,
        TTM_PL_SYSTEM,
};

const uint32_t radeon_busy_prios[] = {
        TTM_PL_TT,
        TTM_PL_VRAM,
        TTM_PL_SYSTEM,
};

static int radeon_sync_obj_wait(void *sync_obj, void *sync_arg,
                                bool lazy, bool interruptible)
{
        return radeon_fence_wait((struct radeon_fence *)sync_obj, interruptible);
}

static int radeon_sync_obj_flush(void *sync_obj, void *sync_arg)
{
        return 0;
}

static void radeon_sync_obj_unref(void **sync_obj)
{
        radeon_fence_unref((struct radeon_fence **)sync_obj);
}

static void *radeon_sync_obj_ref(void *sync_obj)
{
        return radeon_fence_ref((struct radeon_fence *)sync_obj);
}

static bool radeon_sync_obj_signaled(void *sync_obj, void *sync_arg)
{
        return radeon_fence_signaled((struct radeon_fence *)sync_obj);
}

static struct ttm_bo_driver radeon_bo_driver = {
        .mem_type_prio = radeon_mem_prios,
        .mem_busy_prio = radeon_busy_prios,
        .num_mem_type_prio = ARRAY_SIZE(radeon_mem_prios),
        .num_mem_busy_prio = ARRAY_SIZE(radeon_busy_prios),
        .create_ttm_backend_entry = &radeon_create_ttm_backend_entry,
        .invalidate_caches = &radeon_invalidate_caches,
        .init_mem_type = &radeon_init_mem_type,
        .evict_flags = &radeon_evict_flags,
        .move = &radeon_bo_move,
        .verify_access = &radeon_verify_access,
        .sync_obj_signaled = &radeon_sync_obj_signaled,
        .sync_obj_wait = &radeon_sync_obj_wait,
        .sync_obj_flush = &radeon_sync_obj_flush,
        .sync_obj_unref = &radeon_sync_obj_unref,
        .sync_obj_ref = &radeon_sync_obj_ref,
        .move_notify = &radeon_bo_move_notify,
        .fault_reserve_notify = &radeon_bo_fault_reserve_notify,
};

int radeon_ttm_init(struct radeon_device *rdev)
{
        int r;

        r = radeon_ttm_global_init(rdev);
        if (r) {
                return r;
        }
        /* No others user of address space so set it to 0 */
        r = ttm_bo_device_init(&rdev->mman.bdev,
                               rdev->mman.bo_global_ref.ref.object,
                               &radeon_bo_driver, DRM_FILE_PAGE_OFFSET,
                               rdev->need_dma32);
        if (r) {
                DRM_ERROR("failed initializing buffer object driver(%d).\n", r);
                return r;
        }
        r = ttm_bo_init_mm(&rdev->mman.bdev, TTM_PL_VRAM, 0,
                           ((rdev->mc.real_vram_size) >> PAGE_SHIFT));
        if (r) {
                DRM_ERROR("Failed initializing VRAM heap.\n");
                return r;
        }
        r = radeon_object_create(rdev, NULL, 256 * 1024, true,
                                 RADEON_GEM_DOMAIN_VRAM, false,
                                 &rdev->stollen_vga_memory);
        if (r) {
                return r;
        }
        r = radeon_object_pin(rdev->stollen_vga_memory, RADEON_GEM_DOMAIN_VRAM, NULL);
        if (r) {
                radeon_object_unref(&rdev->stollen_vga_memory);
                return r;
        }
        DRM_INFO("radeon: %uM of VRAM memory ready\n",
                 (unsigned)rdev->mc.real_vram_size / (1024 * 1024));
        r = ttm_bo_init_mm(&rdev->mman.bdev, TTM_PL_TT, 0,
                           ((rdev->mc.gtt_size) >> PAGE_SHIFT));
        if (r) {
                DRM_ERROR("Failed initializing GTT heap.\n");
                return r;
        }
        DRM_INFO("radeon: %uM of GTT memory ready.\n",
                 (unsigned)(rdev->mc.gtt_size / (1024 * 1024)));
        if (unlikely(rdev->mman.bdev.dev_mapping == NULL)) {
                rdev->mman.bdev.dev_mapping = rdev->ddev->dev_mapping;
        }

        r = radeon_ttm_debugfs_init(rdev);
        if (r) {
                DRM_ERROR("Failed to init debugfs\n");
                return r;
        }
        return 0;
}

void radeon_ttm_fini(struct radeon_device *rdev)
{
        if (rdev->stollen_vga_memory) {
                radeon_object_unpin(rdev->stollen_vga_memory);
                radeon_object_unref(&rdev->stollen_vga_memory);
        }
        ttm_bo_clean_mm(&rdev->mman.bdev, TTM_PL_VRAM);
        ttm_bo_clean_mm(&rdev->mman.bdev, TTM_PL_TT);
        ttm_bo_device_release(&rdev->mman.bdev);
        radeon_gart_fini(rdev);
        radeon_ttm_global_fini(rdev);
        DRM_INFO("radeon: ttm finalized\n");
}

static struct vm_operations_struct radeon_ttm_vm_ops;
static const struct vm_operations_struct *ttm_vm_ops = NULL;

static int radeon_ttm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
        struct ttm_buffer_object *bo;
        int r;

        bo = (struct ttm_buffer_object *)vma->vm_private_data;
        if (bo == NULL) {
                return VM_FAULT_NOPAGE;
        }
        r = ttm_vm_ops->fault(vma, vmf);
        return r;
}

int radeon_mmap(struct file *filp, struct vm_area_struct *vma)
{
        struct drm_file *file_priv;
        struct radeon_device *rdev;
        int r;

        if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET)) {
                return drm_mmap(filp, vma);
        }

        file_priv = (struct drm_file *)filp->private_data;
        rdev = file_priv->minor->dev->dev_private;
        if (rdev == NULL) {
                return -EINVAL;
        }
        r = ttm_bo_mmap(filp, vma, &rdev->mman.bdev);
        if (unlikely(r != 0)) {
                return r;
        }
        if (unlikely(ttm_vm_ops == NULL)) {
                ttm_vm_ops = vma->vm_ops;
                radeon_ttm_vm_ops = *ttm_vm_ops;
                radeon_ttm_vm_ops.fault = &radeon_ttm_fault;
        }
        vma->vm_ops = &radeon_ttm_vm_ops;
        return 0;
}


/*
 * TTM backend functions.
 */
struct radeon_ttm_backend {
        struct ttm_backend              backend;
        struct radeon_device            *rdev;
        unsigned long                   num_pages;
        struct page                     **pages;
        struct page                     *dummy_read_page;
        bool                            populated;
        bool                            bound;
        unsigned                        offset;
};

static int radeon_ttm_backend_populate(struct ttm_backend *backend,
                                       unsigned long num_pages,
                                       struct page **pages,
                                       struct page *dummy_read_page)
{
        struct radeon_ttm_backend *gtt;

        gtt = container_of(backend, struct radeon_ttm_backend, backend);
        gtt->pages = pages;
        gtt->num_pages = num_pages;
        gtt->dummy_read_page = dummy_read_page;
        gtt->populated = true;
        return 0;
}

static void radeon_ttm_backend_clear(struct ttm_backend *backend)
{
        struct radeon_ttm_backend *gtt;

        gtt = container_of(backend, struct radeon_ttm_backend, backend);
        gtt->pages = NULL;
        gtt->num_pages = 0;
        gtt->dummy_read_page = NULL;
        gtt->populated = false;
        gtt->bound = false;
}


static int radeon_ttm_backend_bind(struct ttm_backend *backend,
                                   struct ttm_mem_reg *bo_mem)
{
        struct radeon_ttm_backend *gtt;
        int r;

        gtt = container_of(backend, struct radeon_ttm_backend, backend);
        gtt->offset = bo_mem->mm_node->start << PAGE_SHIFT;
        if (!gtt->num_pages) {
                WARN(1, "nothing to bind %lu pages for mreg %p back %p!\n", gtt->num_pages, bo_mem, backend);
        }
        r = radeon_gart_bind(gtt->rdev, gtt->offset,
                             gtt->num_pages, gtt->pages);
        if (r) {
                DRM_ERROR("failed to bind %lu pages at 0x%08X\n",
                          gtt->num_pages, gtt->offset);
                return r;
        }
        gtt->bound = true;
        return 0;
}

static int radeon_ttm_backend_unbind(struct ttm_backend *backend)
{
        struct radeon_ttm_backend *gtt;

        gtt = container_of(backend, struct radeon_ttm_backend, backend);
        radeon_gart_unbind(gtt->rdev, gtt->offset, gtt->num_pages);
        gtt->bound = false;
        return 0;
}

static void radeon_ttm_backend_destroy(struct ttm_backend *backend)
{
        struct radeon_ttm_backend *gtt;

        gtt = container_of(backend, struct radeon_ttm_backend, backend);
        if (gtt->bound) {
                radeon_ttm_backend_unbind(backend);
        }
        kfree(gtt);
}

static struct ttm_backend_func radeon_backend_func = {
        .populate = &radeon_ttm_backend_populate,
        .clear = &radeon_ttm_backend_clear,
        .bind = &radeon_ttm_backend_bind,
        .unbind = &radeon_ttm_backend_unbind,
        .destroy = &radeon_ttm_backend_destroy,
};

struct ttm_backend *radeon_ttm_backend_create(struct radeon_device *rdev)
{
        struct radeon_ttm_backend *gtt;

        gtt = kzalloc(sizeof(struct radeon_ttm_backend), GFP_KERNEL);
        if (gtt == NULL) {
                return NULL;
        }
        gtt->backend.bdev = &rdev->mman.bdev;
        gtt->backend.flags = 0;
        gtt->backend.func = &radeon_backend_func;
        gtt->rdev = rdev;
        gtt->pages = NULL;
        gtt->num_pages = 0;
        gtt->dummy_read_page = NULL;
        gtt->populated = false;
        gtt->bound = false;
        return &gtt->backend;
}

#define RADEON_DEBUGFS_MEM_TYPES 2

#if defined(CONFIG_DEBUG_FS)
static int radeon_mm_dump_table(struct seq_file *m, void *data)
{
        struct drm_info_node *node = (struct drm_info_node *)m->private;
        struct drm_mm *mm = (struct drm_mm *)node->info_ent->data;
        struct drm_device *dev = node->minor->dev;
        struct radeon_device *rdev = dev->dev_private;
        int ret;
        struct ttm_bo_global *glob = rdev->mman.bdev.glob;

        spin_lock(&glob->lru_lock);
        ret = drm_mm_dump_table(m, mm);
        spin_unlock(&glob->lru_lock);
        return ret;
}
#endif

static int radeon_ttm_debugfs_init(struct radeon_device *rdev)
{
#if defined(CONFIG_DEBUG_FS)
        static struct drm_info_list radeon_mem_types_list[RADEON_DEBUGFS_MEM_TYPES];
        static char radeon_mem_types_names[RADEON_DEBUGFS_MEM_TYPES][32];
        unsigned i;

        for (i = 0; i < RADEON_DEBUGFS_MEM_TYPES; i++) {
                if (i == 0)
                        sprintf(radeon_mem_types_names[i], "radeon_vram_mm");
                else
                        sprintf(radeon_mem_types_names[i], "radeon_gtt_mm");
                radeon_mem_types_list[i].name = radeon_mem_types_names[i];
                radeon_mem_types_list[i].show = &radeon_mm_dump_table;
                radeon_mem_types_list[i].driver_features = 0;
                if (i == 0)
                        radeon_mem_types_list[i].data = &rdev->mman.bdev.man[TTM_PL_VRAM].manager;
                else
                        radeon_mem_types_list[i].data = &rdev->mman.bdev.man[TTM_PL_TT].manager;

        }
        return radeon_debugfs_add_files(rdev, radeon_mem_types_list, RADEON_DEBUGFS_MEM_TYPES);

#endif
        return 0;
}