/**************************************************************************
 *
 * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
 * 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 above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * 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.
 *
 **************************************************************************/

#include "vmwgfx_drv.h"
#include "vmwgfx_drm.h"
#include "ttm/ttm_object.h"
#include "ttm/ttm_placement.h"
#include "drmP.h"

#define VMW_RES_CONTEXT ttm_driver_type0
#define VMW_RES_SURFACE ttm_driver_type1
#define VMW_RES_STREAM ttm_driver_type2

struct vmw_user_context {
        struct ttm_base_object base;
        struct vmw_resource res;
};

struct vmw_user_surface {
        struct ttm_base_object base;
        struct vmw_surface srf;
};

struct vmw_user_dma_buffer {
        struct ttm_base_object base;
        struct vmw_dma_buffer dma;
};

struct vmw_bo_user_rep {
        uint32_t handle;
        uint64_t map_handle;
};

struct vmw_stream {
        struct vmw_resource res;
        uint32_t stream_id;
};

struct vmw_user_stream {
        struct ttm_base_object base;
        struct vmw_stream stream;
};

static inline struct vmw_dma_buffer *
vmw_dma_buffer(struct ttm_buffer_object *bo)
{
        return container_of(bo, struct vmw_dma_buffer, base);
}

static inline struct vmw_user_dma_buffer *
vmw_user_dma_buffer(struct ttm_buffer_object *bo)
{
        struct vmw_dma_buffer *vmw_bo = vmw_dma_buffer(bo);
        return container_of(vmw_bo, struct vmw_user_dma_buffer, dma);
}

struct vmw_resource *vmw_resource_reference(struct vmw_resource *res)
{
        kref_get(&res->kref);
        return res;
}

static void vmw_resource_release(struct kref *kref)
{
        struct vmw_resource *res =
            container_of(kref, struct vmw_resource, kref);
        struct vmw_private *dev_priv = res->dev_priv;

        idr_remove(res->idr, res->id);
        write_unlock(&dev_priv->resource_lock);

        if (likely(res->hw_destroy != NULL))
                res->hw_destroy(res);

        if (res->res_free != NULL)
                res->res_free(res);
        else
                kfree(res);

        write_lock(&dev_priv->resource_lock);
}

void vmw_resource_unreference(struct vmw_resource **p_res)
{
        struct vmw_resource *res = *p_res;
        struct vmw_private *dev_priv = res->dev_priv;

        *p_res = NULL;
        write_lock(&dev_priv->resource_lock);
        kref_put(&res->kref, vmw_resource_release);
        write_unlock(&dev_priv->resource_lock);
}

static int vmw_resource_init(struct vmw_private *dev_priv,
                             struct vmw_resource *res,
                             struct idr *idr,
                             enum ttm_object_type obj_type,
                             void (*res_free) (struct vmw_resource *res))
{
        int ret;

        kref_init(&res->kref);
        res->hw_destroy = NULL;
        res->res_free = res_free;
        res->res_type = obj_type;
        res->idr = idr;
        res->avail = false;
        res->dev_priv = dev_priv;

        do {
                if (unlikely(idr_pre_get(idr, GFP_KERNEL) == 0))
                        return -ENOMEM;

                write_lock(&dev_priv->resource_lock);
                ret = idr_get_new_above(idr, res, 1, &res->id);
                write_unlock(&dev_priv->resource_lock);

        } while (ret == -EAGAIN);

        return ret;
}

/**
 * vmw_resource_activate
 *
 * @res:        Pointer to the newly created resource
 * @hw_destroy: Destroy function. NULL if none.
 *
 * Activate a resource after the hardware has been made aware of it.
 * Set tye destroy function to @destroy. Typically this frees the
 * resource and destroys the hardware resources associated with it.
 * Activate basically means that the function vmw_resource_lookup will
 * find it.
 */

static void vmw_resource_activate(struct vmw_resource *res,
                                  void (*hw_destroy) (struct vmw_resource *))
{
        struct vmw_private *dev_priv = res->dev_priv;

        write_lock(&dev_priv->resource_lock);
        res->avail = true;
        res->hw_destroy = hw_destroy;
        write_unlock(&dev_priv->resource_lock);
}

struct vmw_resource *vmw_resource_lookup(struct vmw_private *dev_priv,
                                         struct idr *idr, int id)
{
        struct vmw_resource *res;

        read_lock(&dev_priv->resource_lock);
        res = idr_find(idr, id);
        if (res && res->avail)
                kref_get(&res->kref);
        else
                res = NULL;
        read_unlock(&dev_priv->resource_lock);

        if (unlikely(res == NULL))
                return NULL;

        return res;
}

/**
 * Context management:
 */

static void vmw_hw_context_destroy(struct vmw_resource *res)
{

        struct vmw_private *dev_priv = res->dev_priv;
        struct {
                SVGA3dCmdHeader header;
                SVGA3dCmdDestroyContext body;
        } *cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));

        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Failed reserving FIFO space for surface "
                          "destruction.\n");
                return;
        }

        cmd->header.id = cpu_to_le32(SVGA_3D_CMD_CONTEXT_DESTROY);
        cmd->header.size = cpu_to_le32(sizeof(cmd->body));
        cmd->body.cid = cpu_to_le32(res->id);

        vmw_fifo_commit(dev_priv, sizeof(*cmd));
        vmw_3d_resource_dec(dev_priv);
}

static int vmw_context_init(struct vmw_private *dev_priv,
                            struct vmw_resource *res,
                            void (*res_free) (struct vmw_resource *res))
{
        int ret;

        struct {
                SVGA3dCmdHeader header;
                SVGA3dCmdDefineContext body;
        } *cmd;

        ret = vmw_resource_init(dev_priv, res, &dev_priv->context_idr,
                                VMW_RES_CONTEXT, res_free);

        if (unlikely(ret != 0)) {
                if (res_free == NULL)
                        kfree(res);
                else
                        res_free(res);
                return ret;
        }

        cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Fifo reserve failed.\n");
                vmw_resource_unreference(&res);
                return -ENOMEM;
        }

        cmd->header.id = cpu_to_le32(SVGA_3D_CMD_CONTEXT_DEFINE);
        cmd->header.size = cpu_to_le32(sizeof(cmd->body));
        cmd->body.cid = cpu_to_le32(res->id);

        vmw_fifo_commit(dev_priv, sizeof(*cmd));
        (void) vmw_3d_resource_inc(dev_priv);
        vmw_resource_activate(res, vmw_hw_context_destroy);
        return 0;
}

struct vmw_resource *vmw_context_alloc(struct vmw_private *dev_priv)
{
        struct vmw_resource *res = kmalloc(sizeof(*res), GFP_KERNEL);
        int ret;

        if (unlikely(res == NULL))
                return NULL;

        ret = vmw_context_init(dev_priv, res, NULL);
        return (ret == 0) ? res : NULL;
}

/**
 * User-space context management:
 */

static void vmw_user_context_free(struct vmw_resource *res)
{
        struct vmw_user_context *ctx =
            container_of(res, struct vmw_user_context, res);

        kfree(ctx);
}

/**
 * This function is called when user space has no more references on the
 * base object. It releases the base-object's reference on the resource object.
 */

static void vmw_user_context_base_release(struct ttm_base_object **p_base)
{
        struct ttm_base_object *base = *p_base;
        struct vmw_user_context *ctx =
            container_of(base, struct vmw_user_context, base);
        struct vmw_resource *res = &ctx->res;

        *p_base = NULL;
        vmw_resource_unreference(&res);
}

int vmw_context_destroy_ioctl(struct drm_device *dev, void *data,
                              struct drm_file *file_priv)
{
        struct vmw_private *dev_priv = vmw_priv(dev);
        struct vmw_resource *res;
        struct vmw_user_context *ctx;
        struct drm_vmw_context_arg *arg = (struct drm_vmw_context_arg *)data;
        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
        int ret = 0;

        res = vmw_resource_lookup(dev_priv, &dev_priv->context_idr, arg->cid);
        if (unlikely(res == NULL))
                return -EINVAL;

        if (res->res_free != &vmw_user_context_free) {
                ret = -EINVAL;
                goto out;
        }

        ctx = container_of(res, struct vmw_user_context, res);
        if (ctx->base.tfile != tfile && !ctx->base.shareable) {
                ret = -EPERM;
                goto out;
        }

        ttm_ref_object_base_unref(tfile, ctx->base.hash.key, TTM_REF_USAGE);
out:
        vmw_resource_unreference(&res);
        return ret;
}

int vmw_context_define_ioctl(struct drm_device *dev, void *data,
                             struct drm_file *file_priv)
{
        struct vmw_private *dev_priv = vmw_priv(dev);
        struct vmw_user_context *ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
        struct vmw_resource *res;
        struct vmw_resource *tmp;
        struct drm_vmw_context_arg *arg = (struct drm_vmw_context_arg *)data;
        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
        int ret;

        if (unlikely(ctx == NULL))
                return -ENOMEM;

        res = &ctx->res;
        ctx->base.shareable = false;
        ctx->base.tfile = NULL;

        ret = vmw_context_init(dev_priv, res, vmw_user_context_free);
        if (unlikely(ret != 0))
                return ret;

        tmp = vmw_resource_reference(&ctx->res);
        ret = ttm_base_object_init(tfile, &ctx->base, false, VMW_RES_CONTEXT,
                                   &vmw_user_context_base_release, NULL);

        if (unlikely(ret != 0)) {
                vmw_resource_unreference(&tmp);
                goto out_err;
        }

        arg->cid = res->id;
out_err:
        vmw_resource_unreference(&res);
        return ret;

}

int vmw_context_check(struct vmw_private *dev_priv,
                      struct ttm_object_file *tfile,
                      int id)
{
        struct vmw_resource *res;
        int ret = 0;

        read_lock(&dev_priv->resource_lock);
        res = idr_find(&dev_priv->context_idr, id);
        if (res && res->avail) {
                struct vmw_user_context *ctx =
                        container_of(res, struct vmw_user_context, res);
                if (ctx->base.tfile != tfile && !ctx->base.shareable)
                        ret = -EPERM;
        } else
                ret = -EINVAL;
        read_unlock(&dev_priv->resource_lock);

        return ret;
}


/**
 * Surface management.
 */

static void vmw_hw_surface_destroy(struct vmw_resource *res)
{

        struct vmw_private *dev_priv = res->dev_priv;
        struct {
                SVGA3dCmdHeader header;
                SVGA3dCmdDestroySurface body;
        } *cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));

        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Failed reserving FIFO space for surface "
                          "destruction.\n");
                return;
        }

        cmd->header.id = cpu_to_le32(SVGA_3D_CMD_SURFACE_DESTROY);
        cmd->header.size = cpu_to_le32(sizeof(cmd->body));
        cmd->body.sid = cpu_to_le32(res->id);

        vmw_fifo_commit(dev_priv, sizeof(*cmd));
        vmw_3d_resource_dec(dev_priv);
}

void vmw_surface_res_free(struct vmw_resource *res)
{
        struct vmw_surface *srf = container_of(res, struct vmw_surface, res);

        kfree(srf->sizes);
        kfree(srf->snooper.image);
        kfree(srf);
}

int vmw_surface_init(struct vmw_private *dev_priv,
                     struct vmw_surface *srf,
                     void (*res_free) (struct vmw_resource *res))
{
        int ret;
        struct {
                SVGA3dCmdHeader header;
                SVGA3dCmdDefineSurface body;
        } *cmd;
        SVGA3dSize *cmd_size;
        struct vmw_resource *res = &srf->res;
        struct drm_vmw_size *src_size;
        size_t submit_size;
        uint32_t cmd_len;
        int i;

        BUG_ON(res_free == NULL);
        ret = vmw_resource_init(dev_priv, res, &dev_priv->surface_idr,
                                VMW_RES_SURFACE, res_free);

        if (unlikely(ret != 0)) {
                res_free(res);
                return ret;
        }

        submit_size = sizeof(*cmd) + srf->num_sizes * sizeof(SVGA3dSize);
        cmd_len = sizeof(cmd->body) + srf->num_sizes * sizeof(SVGA3dSize);

        cmd = vmw_fifo_reserve(dev_priv, submit_size);
        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Fifo reserve failed for create surface.\n");
                vmw_resource_unreference(&res);
                return -ENOMEM;
        }

        cmd->header.id = cpu_to_le32(SVGA_3D_CMD_SURFACE_DEFINE);
        cmd->header.size = cpu_to_le32(cmd_len);
        cmd->body.sid = cpu_to_le32(res->id);
        cmd->body.surfaceFlags = cpu_to_le32(srf->flags);
        cmd->body.format = cpu_to_le32(srf->format);
        for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i) {
                cmd->body.face[i].numMipLevels =
                    cpu_to_le32(srf->mip_levels[i]);
        }

        cmd += 1;
        cmd_size = (SVGA3dSize *) cmd;
        src_size = srf->sizes;

        for (i = 0; i < srf->num_sizes; ++i, cmd_size++, src_size++) {
                cmd_size->width = cpu_to_le32(src_size->width);
                cmd_size->height = cpu_to_le32(src_size->height);
                cmd_size->depth = cpu_to_le32(src_size->depth);
        }

        vmw_fifo_commit(dev_priv, submit_size);
        (void) vmw_3d_resource_inc(dev_priv);
        vmw_resource_activate(res, vmw_hw_surface_destroy);
        return 0;
}

static void vmw_user_surface_free(struct vmw_resource *res)
{
        struct vmw_surface *srf = container_of(res, struct vmw_surface, res);
        struct vmw_user_surface *user_srf =
            container_of(srf, struct vmw_user_surface, srf);

        kfree(srf->sizes);
        kfree(srf->snooper.image);
        kfree(user_srf);
}

int vmw_user_surface_lookup_handle(struct vmw_private *dev_priv,
                                   struct ttm_object_file *tfile,
                                   uint32_t handle, struct vmw_surface **out)
{
        struct vmw_resource *res;
        struct vmw_surface *srf;
        struct vmw_user_surface *user_srf;
        struct ttm_base_object *base;
        int ret = -EINVAL;

        base = ttm_base_object_lookup(tfile, handle);
        if (unlikely(base == NULL))
                return -EINVAL;

        if (unlikely(base->object_type != VMW_RES_SURFACE))
                goto out_bad_resource;

        user_srf = container_of(base, struct vmw_user_surface, base);
        srf = &user_srf->srf;
        res = &srf->res;

        read_lock(&dev_priv->resource_lock);

        if (!res->avail || res->res_free != &vmw_user_surface_free) {
                read_unlock(&dev_priv->resource_lock);
                goto out_bad_resource;
        }

        kref_get(&res->kref);
        read_unlock(&dev_priv->resource_lock);

        *out = srf;
        ret = 0;

out_bad_resource:
        ttm_base_object_unref(&base);

        return ret;
}

static void vmw_user_surface_base_release(struct ttm_base_object **p_base)
{
        struct ttm_base_object *base = *p_base;
        struct vmw_user_surface *user_srf =
            container_of(base, struct vmw_user_surface, base);
        struct vmw_resource *res = &user_srf->srf.res;

        *p_base = NULL;
        vmw_resource_unreference(&res);
}

int vmw_surface_destroy_ioctl(struct drm_device *dev, void *data,
                              struct drm_file *file_priv)
{
        struct drm_vmw_surface_arg *arg = (struct drm_vmw_surface_arg *)data;
        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;

        return ttm_ref_object_base_unref(tfile, arg->sid, TTM_REF_USAGE);
}

int vmw_surface_define_ioctl(struct drm_device *dev, void *data,
                             struct drm_file *file_priv)
{
        struct vmw_private *dev_priv = vmw_priv(dev);
        struct vmw_user_surface *user_srf =
            kmalloc(sizeof(*user_srf), GFP_KERNEL);
        struct vmw_surface *srf;
        struct vmw_resource *res;
        struct vmw_resource *tmp;
        union drm_vmw_surface_create_arg *arg =
            (union drm_vmw_surface_create_arg *)data;
        struct drm_vmw_surface_create_req *req = &arg->req;
        struct drm_vmw_surface_arg *rep = &arg->rep;
        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
        struct drm_vmw_size __user *user_sizes;
        int ret;
        int i;

        if (unlikely(user_srf == NULL))
                return -ENOMEM;

        srf = &user_srf->srf;
        res = &srf->res;

        srf->flags = req->flags;
        srf->format = req->format;
        srf->scanout = req->scanout;
        memcpy(srf->mip_levels, req->mip_levels, sizeof(srf->mip_levels));
        srf->num_sizes = 0;
        for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i)
                srf->num_sizes += srf->mip_levels[i];

        if (srf->num_sizes > DRM_VMW_MAX_SURFACE_FACES *
            DRM_VMW_MAX_MIP_LEVELS) {
                ret = -EINVAL;
                goto out_err0;
        }

        srf->sizes = kmalloc(srf->num_sizes * sizeof(*srf->sizes), GFP_KERNEL);
        if (unlikely(srf->sizes == NULL)) {
                ret = -ENOMEM;
                goto out_err0;
        }

        user_sizes = (struct drm_vmw_size __user *)(unsigned long)
            req->size_addr;

        ret = copy_from_user(srf->sizes, user_sizes,
                             srf->num_sizes * sizeof(*srf->sizes));
        if (unlikely(ret != 0)) {
                ret = -EFAULT;
                goto out_err1;
        }

        if (srf->scanout &&
            srf->num_sizes == 1 &&
            srf->sizes[0].width == 64 &&
            srf->sizes[0].height == 64 &&
            srf->format == SVGA3D_A8R8G8B8) {

                /* allocate image area and clear it */
                srf->snooper.image = kzalloc(64 * 64 * 4, GFP_KERNEL);
                if (!srf->snooper.image) {
                        DRM_ERROR("Failed to allocate cursor_image\n");
                        ret = -ENOMEM;
                        goto out_err1;
                }
        } else {
                srf->snooper.image = NULL;
        }
        srf->snooper.crtc = NULL;

        user_srf->base.shareable = false;
        user_srf->base.tfile = NULL;

        /**
         * From this point, the generic resource management functions
         * destroy the object on failure.
         */

        ret = vmw_surface_init(dev_priv, srf, vmw_user_surface_free);
        if (unlikely(ret != 0))
                return ret;

        tmp = vmw_resource_reference(&srf->res);
        ret = ttm_base_object_init(tfile, &user_srf->base,
                                   req->shareable, VMW_RES_SURFACE,
                                   &vmw_user_surface_base_release, NULL);

        if (unlikely(ret != 0)) {
                vmw_resource_unreference(&tmp);
                vmw_resource_unreference(&res);
                return ret;
        }

        rep->sid = user_srf->base.hash.key;
        if (rep->sid == SVGA3D_INVALID_ID)
                DRM_ERROR("Created bad Surface ID.\n");

        vmw_resource_unreference(&res);
        return 0;
out_err1:
        kfree(srf->sizes);
out_err0:
        kfree(user_srf);
        return ret;
}

int vmw_surface_reference_ioctl(struct drm_device *dev, void *data,
                                struct drm_file *file_priv)
{
        union drm_vmw_surface_reference_arg *arg =
            (union drm_vmw_surface_reference_arg *)data;
        struct drm_vmw_surface_arg *req = &arg->req;
        struct drm_vmw_surface_create_req *rep = &arg->rep;
        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
        struct vmw_surface *srf;
        struct vmw_user_surface *user_srf;
        struct drm_vmw_size __user *user_sizes;
        struct ttm_base_object *base;
        int ret = -EINVAL;

        base = ttm_base_object_lookup(tfile, req->sid);
        if (unlikely(base == NULL)) {
                DRM_ERROR("Could not find surface to reference.\n");
                return -EINVAL;
        }

        if (unlikely(base->object_type != VMW_RES_SURFACE))
                goto out_bad_resource;

        user_srf = container_of(base, struct vmw_user_surface, base);
        srf = &user_srf->srf;

        ret = ttm_ref_object_add(tfile, &user_srf->base, TTM_REF_USAGE, NULL);
        if (unlikely(ret != 0)) {
                DRM_ERROR("Could not add a reference to a surface.\n");
                goto out_no_reference;
        }

        rep->flags = srf->flags;
        rep->format = srf->format;
        memcpy(rep->mip_levels, srf->mip_levels, sizeof(srf->mip_levels));
        user_sizes = (struct drm_vmw_size __user *)(unsigned long)
            rep->size_addr;

        if (user_sizes)
                ret = copy_to_user(user_sizes, srf->sizes,
                                   srf->num_sizes * sizeof(*srf->sizes));
        if (unlikely(ret != 0)) {
                DRM_ERROR("copy_to_user failed %p %u\n",
                          user_sizes, srf->num_sizes);
                ret = -EFAULT;
        }
out_bad_resource:
out_no_reference:
        ttm_base_object_unref(&base);

        return ret;
}

int vmw_surface_check(struct vmw_private *dev_priv,
                      struct ttm_object_file *tfile,
                      uint32_t handle, int *id)
{
        struct ttm_base_object *base;
        struct vmw_user_surface *user_srf;

        int ret = -EPERM;

        base = ttm_base_object_lookup(tfile, handle);
        if (unlikely(base == NULL))
                return -EINVAL;

        if (unlikely(base->object_type != VMW_RES_SURFACE))
                goto out_bad_surface;

        user_srf = container_of(base, struct vmw_user_surface, base);
        *id = user_srf->srf.res.id;
        ret = 0;

out_bad_surface:
        /**
         * FIXME: May deadlock here when called from the
         * command parsing code.
         */

        ttm_base_object_unref(&base);
        return ret;
}

/**
 * Buffer management.
 */

static size_t vmw_dmabuf_acc_size(struct ttm_bo_global *glob,
                                  unsigned long num_pages)
{
        static size_t bo_user_size = ~0;

        size_t page_array_size =
            (num_pages * sizeof(void *) + PAGE_SIZE - 1) & PAGE_MASK;

        if (unlikely(bo_user_size == ~0)) {
                bo_user_size = glob->ttm_bo_extra_size +
                    ttm_round_pot(sizeof(struct vmw_dma_buffer));
        }

        return bo_user_size + page_array_size;
}

void vmw_dmabuf_bo_free(struct ttm_buffer_object *bo)
{
        struct vmw_dma_buffer *vmw_bo = vmw_dma_buffer(bo);
        struct ttm_bo_global *glob = bo->glob;

        ttm_mem_global_free(glob->mem_glob, bo->acc_size);
        kfree(vmw_bo);
}

int vmw_dmabuf_init(struct vmw_private *dev_priv,
                    struct vmw_dma_buffer *vmw_bo,
                    size_t size, struct ttm_placement *placement,
                    bool interruptible,
                    void (*bo_free) (struct ttm_buffer_object *bo))
{
        struct ttm_bo_device *bdev = &dev_priv->bdev;
        struct ttm_mem_global *mem_glob = bdev->glob->mem_glob;
        size_t acc_size;
        int ret;

        BUG_ON(!bo_free);

        acc_size =
            vmw_dmabuf_acc_size(bdev->glob,
                                (size + PAGE_SIZE - 1) >> PAGE_SHIFT);

        ret = ttm_mem_global_alloc(mem_glob, acc_size, false, false);
        if (unlikely(ret != 0)) {
                /* we must free the bo here as
                 * ttm_buffer_object_init does so as well */
                bo_free(&vmw_bo->base);
                return ret;
        }

        memset(vmw_bo, 0, sizeof(*vmw_bo));

        INIT_LIST_HEAD(&vmw_bo->validate_list);

        ret = ttm_bo_init(bdev, &vmw_bo->base, size,
                          ttm_bo_type_device, placement,
                          0, 0, interruptible,
                          NULL, acc_size, bo_free);
        return ret;
}

static void vmw_user_dmabuf_destroy(struct ttm_buffer_object *bo)
{
        struct vmw_user_dma_buffer *vmw_user_bo = vmw_user_dma_buffer(bo);
        struct ttm_bo_global *glob = bo->glob;

        ttm_mem_global_free(glob->mem_glob, bo->acc_size);
        kfree(vmw_user_bo);
}

static void vmw_user_dmabuf_release(struct ttm_base_object **p_base)
{
        struct vmw_user_dma_buffer *vmw_user_bo;
        struct ttm_base_object *base = *p_base;
        struct ttm_buffer_object *bo;

        *p_base = NULL;

        if (unlikely(base == NULL))
                return;

        vmw_user_bo = container_of(base, struct vmw_user_dma_buffer, base);
        bo = &vmw_user_bo->dma.base;
        ttm_bo_unref(&bo);
}

int vmw_dmabuf_alloc_ioctl(struct drm_device *dev, void *data,
                           struct drm_file *file_priv)
{
        struct vmw_private *dev_priv = vmw_priv(dev);
        union drm_vmw_alloc_dmabuf_arg *arg =
            (union drm_vmw_alloc_dmabuf_arg *)data;
        struct drm_vmw_alloc_dmabuf_req *req = &arg->req;
        struct drm_vmw_dmabuf_rep *rep = &arg->rep;
        struct vmw_user_dma_buffer *vmw_user_bo;
        struct ttm_buffer_object *tmp;
        struct vmw_master *vmaster = vmw_master(file_priv->master);
        int ret;

        vmw_user_bo = kzalloc(sizeof(*vmw_user_bo), GFP_KERNEL);
        if (unlikely(vmw_user_bo == NULL))
                return -ENOMEM;

        ret = ttm_read_lock(&vmaster->lock, true);
        if (unlikely(ret != 0)) {
                kfree(vmw_user_bo);
                return ret;
        }

        ret = vmw_dmabuf_init(dev_priv, &vmw_user_bo->dma, req->size,
                              &vmw_vram_sys_placement, true,
                              &vmw_user_dmabuf_destroy);
        if (unlikely(ret != 0))
                goto out_no_dmabuf;

        tmp = ttm_bo_reference(&vmw_user_bo->dma.base);
        ret = ttm_base_object_init(vmw_fpriv(file_priv)->tfile,
                                   &vmw_user_bo->base,
                                   false,
                                   ttm_buffer_type,
                                   &vmw_user_dmabuf_release, NULL);
        if (unlikely(ret != 0))
                goto out_no_base_object;
        else {
                rep->handle = vmw_user_bo->base.hash.key;
                rep->map_handle = vmw_user_bo->dma.base.addr_space_offset;
                rep->cur_gmr_id = vmw_user_bo->base.hash.key;
                rep->cur_gmr_offset = 0;
        }

out_no_base_object:
        ttm_bo_unref(&tmp);
out_no_dmabuf:
        ttm_read_unlock(&vmaster->lock);

        return ret;
}

int vmw_dmabuf_unref_ioctl(struct drm_device *dev, void *data,
                           struct drm_file *file_priv)
{
        struct drm_vmw_unref_dmabuf_arg *arg =
            (struct drm_vmw_unref_dmabuf_arg *)data;

        return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
                                         arg->handle,
                                         TTM_REF_USAGE);
}

uint32_t vmw_dmabuf_validate_node(struct ttm_buffer_object *bo,
                                  uint32_t cur_validate_node)
{
        struct vmw_dma_buffer *vmw_bo = vmw_dma_buffer(bo);

        if (likely(vmw_bo->on_validate_list))
                return vmw_bo->cur_validate_node;

        vmw_bo->cur_validate_node = cur_validate_node;
        vmw_bo->on_validate_list = true;

        return cur_validate_node;
}

void vmw_dmabuf_validate_clear(struct ttm_buffer_object *bo)
{
        struct vmw_dma_buffer *vmw_bo = vmw_dma_buffer(bo);

        vmw_bo->on_validate_list = false;
}

int vmw_user_dmabuf_lookup(struct ttm_object_file *tfile,
                           uint32_t handle, struct vmw_dma_buffer **out)
{
        struct vmw_user_dma_buffer *vmw_user_bo;
        struct ttm_base_object *base;

        base = ttm_base_object_lookup(tfile, handle);
        if (unlikely(base == NULL)) {
                printk(KERN_ERR "Invalid buffer object handle 0x%08lx.\n",
                       (unsigned long)handle);
                return -ESRCH;
        }

        if (unlikely(base->object_type != ttm_buffer_type)) {
                ttm_base_object_unref(&base);
                printk(KERN_ERR "Invalid buffer object handle 0x%08lx.\n",
                       (unsigned long)handle);
                return -EINVAL;
        }

        vmw_user_bo = container_of(base, struct vmw_user_dma_buffer, base);
        (void)ttm_bo_reference(&vmw_user_bo->dma.base);
        ttm_base_object_unref(&base);
        *out = &vmw_user_bo->dma;

        return 0;
}

/*
 * Stream management
 */

static void vmw_stream_destroy(struct vmw_resource *res)
{
        struct vmw_private *dev_priv = res->dev_priv;
        struct vmw_stream *stream;
        int ret;

        DRM_INFO("%s: unref\n", __func__);
        stream = container_of(res, struct vmw_stream, res);

        ret = vmw_overlay_unref(dev_priv, stream->stream_id);
        WARN_ON(ret != 0);
}

static int vmw_stream_init(struct vmw_private *dev_priv,
                           struct vmw_stream *stream,
                           void (*res_free) (struct vmw_resource *res))
{
        struct vmw_resource *res = &stream->res;
        int ret;

        ret = vmw_resource_init(dev_priv, res, &dev_priv->stream_idr,
                                VMW_RES_STREAM, res_free);

        if (unlikely(ret != 0)) {
                if (res_free == NULL)
                        kfree(stream);
                else
                        res_free(&stream->res);
                return ret;
        }

        ret = vmw_overlay_claim(dev_priv, &stream->stream_id);
        if (ret) {
                vmw_resource_unreference(&res);
                return ret;
        }

        DRM_INFO("%s: claimed\n", __func__);

        vmw_resource_activate(&stream->res, vmw_stream_destroy);
        return 0;
}

/**
 * User-space context management:
 */

static void vmw_user_stream_free(struct vmw_resource *res)
{

        struct vmw_user_stream *stream =
            container_of(res, struct vmw_user_stream, stream.res);

        kfree(stream);
}

/**
 * This function is called when user space has no more references on the
 * base object. It releases the base-object's reference on the resource object.
 */

static void vmw_user_stream_base_release(struct ttm_base_object **p_base)
{
        struct ttm_base_object *base = *p_base;
        struct vmw_user_stream *stream =
            container_of(base, struct vmw_user_stream, base);
        struct vmw_resource *res = &stream->stream.res;

        *p_base = NULL;
        vmw_resource_unreference(&res);
}

int vmw_stream_unref_ioctl(struct drm_device *dev, void *data,
                           struct drm_file *file_priv)
{
        struct vmw_private *dev_priv = vmw_priv(dev);
        struct vmw_resource *res;
        struct vmw_user_stream *stream;
        struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
        int ret = 0;

        res = vmw_resource_lookup(dev_priv, &dev_priv->stream_idr, arg->stream_id);
        if (unlikely(res == NULL))
                return -EINVAL;

        if (res->res_free != &vmw_user_stream_free) {
                ret = -EINVAL;
                goto out;
        }

        stream = container_of(res, struct vmw_user_stream, stream.res);
        if (stream->base.tfile != tfile) {
                ret = -EINVAL;
                goto out;
        }

        ttm_ref_object_base_unref(tfile, stream->base.hash.key, TTM_REF_USAGE);
out:
        vmw_resource_unreference(&res);
        return ret;
}

int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
                           struct drm_file *file_priv)
{
        struct vmw_private *dev_priv = vmw_priv(dev);
        struct vmw_user_stream *stream = kmalloc(sizeof(*stream), GFP_KERNEL);
        struct vmw_resource *res;
        struct vmw_resource *tmp;
        struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
        int ret;

        if (unlikely(stream == NULL))
                return -ENOMEM;

        res = &stream->stream.res;
        stream->base.shareable = false;
        stream->base.tfile = NULL;

        ret = vmw_stream_init(dev_priv, &stream->stream, vmw_user_stream_free);
        if (unlikely(ret != 0))
                return ret;

        tmp = vmw_resource_reference(res);
        ret = ttm_base_object_init(tfile, &stream->base, false, VMW_RES_STREAM,
                                   &vmw_user_stream_base_release, NULL);

        if (unlikely(ret != 0)) {
                vmw_resource_unreference(&tmp);
                goto out_err;
        }

        arg->stream_id = res->id;
out_err:
        vmw_resource_unreference(&res);
        return ret;
}

int vmw_user_stream_lookup(struct vmw_private *dev_priv,
                           struct ttm_object_file *tfile,
                           uint32_t *inout_id, struct vmw_resource **out)
{
        struct vmw_user_stream *stream;
        struct vmw_resource *res;
        int ret;

        res = vmw_resource_lookup(dev_priv, &dev_priv->stream_idr, *inout_id);
        if (unlikely(res == NULL))
                return -EINVAL;

        if (res->res_free != &vmw_user_stream_free) {
                ret = -EINVAL;
                goto err_ref;
        }

        stream = container_of(res, struct vmw_user_stream, stream.res);
        if (stream->base.tfile != tfile) {
                ret = -EPERM;
                goto err_ref;
        }

        *inout_id = stream->stream.stream_id;
        *out = res;
        return 0;
err_ref:
        vmw_resource_unreference(&res);
        return ret;
}