drm/ttm: simplify memory accounting for ttm user v2

[deliverable/linux.git] / drivers / gpu / drm / vmwgfx / vmwgfx_resource.c

/**************************************************************************
 *
 * 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"

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;
        uint32_t size;
};

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;
};

struct vmw_surface_offset {
        uint32_t face;
        uint32_t mip;
        uint32_t bo_offset;
};


static uint64_t vmw_user_context_size;
static uint64_t vmw_user_surface_size;
static uint64_t vmw_user_stream_size;

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;
}


/**
 * vmw_resource_release_id - release a resource id to the id manager.
 *
 * @res: Pointer to the resource.
 *
 * Release the resource id to the resource id manager and set it to -1
 */
static void vmw_resource_release_id(struct vmw_resource *res)
{
        struct vmw_private *dev_priv = res->dev_priv;

        write_lock(&dev_priv->resource_lock);
        if (res->id != -1)
                idr_remove(res->idr, res->id);
        res->id = -1;
        write_unlock(&dev_priv->resource_lock);
}

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;
        int id = res->id;
        struct idr *idr = res->idr;

        res->avail = false;
        if (res->remove_from_lists != NULL)
                res->remove_from_lists(res);
        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);

        if (id != -1)
                idr_remove(idr, id);
}

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);
}


/**
 * vmw_resource_alloc_id - release a resource id to the id manager.
 *
 * @dev_priv: Pointer to the device private structure.
 * @res: Pointer to the resource.
 *
 * Allocate the lowest free resource from the resource manager, and set
 * @res->id to that id. Returns 0 on success and -ENOMEM on failure.
 */
static int vmw_resource_alloc_id(struct vmw_private *dev_priv,
                                 struct vmw_resource *res)
{
        int ret;

        BUG_ON(res->id != -1);

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

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

        } while (ret == -EAGAIN);

        return ret;
}


static int vmw_resource_init(struct vmw_private *dev_priv,
                             struct vmw_resource *res,
                             struct idr *idr,
                             enum ttm_object_type obj_type,
                             bool delay_id,
                             void (*res_free) (struct vmw_resource *res),
                             void (*remove_from_lists)
                             (struct vmw_resource *res))
{
        kref_init(&res->kref);
        res->hw_destroy = NULL;
        res->res_free = res_free;
        res->remove_from_lists = remove_from_lists;
        res->res_type = obj_type;
        res->idr = idr;
        res->avail = false;
        res->dev_priv = dev_priv;
        INIT_LIST_HEAD(&res->query_head);
        INIT_LIST_HEAD(&res->validate_head);
        res->id = -1;
        if (delay_id)
                return 0;
        else
                return vmw_resource_alloc_id(dev_priv, res);
}

/**
 * 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_execbuf_release_pinned_bo(dev_priv, true, res->id);

        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, false);
}

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, false, res_free, NULL);

        if (unlikely(ret != 0)) {
                DRM_ERROR("Failed to allocate a resource id.\n");
                goto out_early;
        }

        if (unlikely(res->id >= SVGA3D_MAX_CONTEXT_IDS)) {
                DRM_ERROR("Out of hw context ids.\n");
                vmw_resource_unreference(&res);
                return -ENOMEM;
        }

        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, false);
        vmw_resource_activate(res, vmw_hw_context_destroy);
        return 0;

out_early:
        if (res_free == NULL)
                kfree(res);
        else
                res_free(res);
        return ret;
}

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);
        struct vmw_private *dev_priv = res->dev_priv;

        kfree(ctx);
        ttm_mem_global_free(vmw_mem_glob(dev_priv),
                            vmw_user_context_size);
}

/**
 * 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;
        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;
        struct vmw_master *vmaster = vmw_master(file_priv->master);
        int ret;


        /*
         * Approximate idr memory usage with 128 bytes. It will be limited
         * by maximum number_of contexts anyway.
         */

        if (unlikely(vmw_user_context_size == 0))
                vmw_user_context_size = ttm_round_pot(sizeof(*ctx)) + 128;

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

        ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
                                   vmw_user_context_size,
                                   false, true);
        if (unlikely(ret != 0)) {
                if (ret != -ERESTARTSYS)
                        DRM_ERROR("Out of graphics memory for context"
                                  " creation.\n");
                goto out_unlock;
        }

        ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
        if (unlikely(ctx == NULL)) {
                ttm_mem_global_free(vmw_mem_glob(dev_priv),
                                    vmw_user_context_size);
                ret = -ENOMEM;
                goto out_unlock;
        }

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

        /*
         * From here on, the destructor takes over resource freeing.
         */

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

        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);
out_unlock:
        ttm_read_unlock(&vmaster->lock);
        return ret;

}

int vmw_context_check(struct vmw_private *dev_priv,
                      struct ttm_object_file *tfile,
                      int id,
                      struct vmw_resource **p_res)
{
        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;
                if (p_res)
                        *p_res = vmw_resource_reference(res);
        } else
                ret = -EINVAL;
        read_unlock(&dev_priv->resource_lock);

        return ret;
}

struct vmw_bpp {
        uint8_t bpp;
        uint8_t s_bpp;
};

/*
 * Size table for the supported SVGA3D surface formats. It consists of
 * two values. The bpp value and the s_bpp value which is short for
 * "stride bits per pixel" The values are given in such a way that the
 * minimum stride for the image is calculated using
 *
 * min_stride = w*s_bpp
 *
 * and the total memory requirement for the image is
 *
 * h*min_stride*bpp/s_bpp
 *
 */
static const struct vmw_bpp vmw_sf_bpp[] = {
        [SVGA3D_FORMAT_INVALID] = {0, 0},
        [SVGA3D_X8R8G8B8] = {32, 32},
        [SVGA3D_A8R8G8B8] = {32, 32},
        [SVGA3D_R5G6B5] = {16, 16},
        [SVGA3D_X1R5G5B5] = {16, 16},
        [SVGA3D_A1R5G5B5] = {16, 16},
        [SVGA3D_A4R4G4B4] = {16, 16},
        [SVGA3D_Z_D32] = {32, 32},
        [SVGA3D_Z_D16] = {16, 16},
        [SVGA3D_Z_D24S8] = {32, 32},
        [SVGA3D_Z_D15S1] = {16, 16},
        [SVGA3D_LUMINANCE8] = {8, 8},
        [SVGA3D_LUMINANCE4_ALPHA4] = {8, 8},
        [SVGA3D_LUMINANCE16] = {16, 16},
        [SVGA3D_LUMINANCE8_ALPHA8] = {16, 16},
        [SVGA3D_DXT1] = {4, 16},
        [SVGA3D_DXT2] = {8, 32},
        [SVGA3D_DXT3] = {8, 32},
        [SVGA3D_DXT4] = {8, 32},
        [SVGA3D_DXT5] = {8, 32},
        [SVGA3D_BUMPU8V8] = {16, 16},
        [SVGA3D_BUMPL6V5U5] = {16, 16},
        [SVGA3D_BUMPX8L8V8U8] = {32, 32},
        [SVGA3D_ARGB_S10E5] = {16, 16},
        [SVGA3D_ARGB_S23E8] = {32, 32},
        [SVGA3D_A2R10G10B10] = {32, 32},
        [SVGA3D_V8U8] = {16, 16},
        [SVGA3D_Q8W8V8U8] = {32, 32},
        [SVGA3D_CxV8U8] = {16, 16},
        [SVGA3D_X8L8V8U8] = {32, 32},
        [SVGA3D_A2W10V10U10] = {32, 32},
        [SVGA3D_ALPHA8] = {8, 8},
        [SVGA3D_R_S10E5] = {16, 16},
        [SVGA3D_R_S23E8] = {32, 32},
        [SVGA3D_RG_S10E5] = {16, 16},
        [SVGA3D_RG_S23E8] = {32, 32},
        [SVGA3D_BUFFER] = {8, 8},
        [SVGA3D_Z_D24X8] = {32, 32},
        [SVGA3D_V16U16] = {32, 32},
        [SVGA3D_G16R16] = {32, 32},
        [SVGA3D_A16B16G16R16] = {64,  64},
        [SVGA3D_UYVY] = {12, 12},
        [SVGA3D_YUY2] = {12, 12},
        [SVGA3D_NV12] = {12, 8},
        [SVGA3D_AYUV] = {32, 32},
        [SVGA3D_BC4_UNORM] = {4,  16},
        [SVGA3D_BC5_UNORM] = {8,  32},
        [SVGA3D_Z_DF16] = {16,  16},
        [SVGA3D_Z_DF24] = {24,  24},
        [SVGA3D_Z_D24S8_INT] = {32,  32}
};


/**
 * Surface management.
 */

struct vmw_surface_dma {
        SVGA3dCmdHeader header;
        SVGA3dCmdSurfaceDMA body;
        SVGA3dCopyBox cb;
        SVGA3dCmdSurfaceDMASuffix suffix;
};

struct vmw_surface_define {
        SVGA3dCmdHeader header;
        SVGA3dCmdDefineSurface body;
};

struct vmw_surface_destroy {
        SVGA3dCmdHeader header;
        SVGA3dCmdDestroySurface body;
};


/**
 * vmw_surface_dma_size - Compute fifo size for a dma command.
 *
 * @srf: Pointer to a struct vmw_surface
 *
 * Computes the required size for a surface dma command for backup or
 * restoration of the surface represented by @srf.
 */
static inline uint32_t vmw_surface_dma_size(const struct vmw_surface *srf)
{
        return srf->num_sizes * sizeof(struct vmw_surface_dma);
}


/**
 * vmw_surface_define_size - Compute fifo size for a surface define command.
 *
 * @srf: Pointer to a struct vmw_surface
 *
 * Computes the required size for a surface define command for the definition
 * of the surface represented by @srf.
 */
static inline uint32_t vmw_surface_define_size(const struct vmw_surface *srf)
{
        return sizeof(struct vmw_surface_define) + srf->num_sizes *
                sizeof(SVGA3dSize);
}


/**
 * vmw_surface_destroy_size - Compute fifo size for a surface destroy command.
 *
 * Computes the required size for a surface destroy command for the destruction
 * of a hw surface.
 */
static inline uint32_t vmw_surface_destroy_size(void)
{
        return sizeof(struct vmw_surface_destroy);
}

/**
 * vmw_surface_destroy_encode - Encode a surface_destroy command.
 *
 * @id: The surface id
 * @cmd_space: Pointer to memory area in which the commands should be encoded.
 */
static void vmw_surface_destroy_encode(uint32_t id,
                                       void *cmd_space)
{
        struct vmw_surface_destroy *cmd = (struct vmw_surface_destroy *)
                cmd_space;

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

/**
 * vmw_surface_define_encode - Encode a surface_define command.
 *
 * @srf: Pointer to a struct vmw_surface object.
 * @cmd_space: Pointer to memory area in which the commands should be encoded.
 */
static void vmw_surface_define_encode(const struct vmw_surface *srf,
                                      void *cmd_space)
{
        struct vmw_surface_define *cmd = (struct vmw_surface_define *)
                cmd_space;
        struct drm_vmw_size *src_size;
        SVGA3dSize *cmd_size;
        uint32_t cmd_len;
        int i;

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

        cmd->header.id = SVGA_3D_CMD_SURFACE_DEFINE;
        cmd->header.size = cmd_len;
        cmd->body.sid = srf->res.id;
        cmd->body.surfaceFlags = 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 = 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 = src_size->width;
                cmd_size->height = src_size->height;
                cmd_size->depth = src_size->depth;
        }
}


/**
 * vmw_surface_dma_encode - Encode a surface_dma command.
 *
 * @srf: Pointer to a struct vmw_surface object.
 * @cmd_space: Pointer to memory area in which the commands should be encoded.
 * @ptr: Pointer to an SVGAGuestPtr indicating where the surface contents
 * should be placed or read from.
 * @to_surface: Boolean whether to DMA to the surface or from the surface.
 */
static void vmw_surface_dma_encode(struct vmw_surface *srf,
                                   void *cmd_space,
                                   const SVGAGuestPtr *ptr,
                                   bool to_surface)
{
        uint32_t i;
        uint32_t bpp = vmw_sf_bpp[srf->format].bpp;
        uint32_t stride_bpp = vmw_sf_bpp[srf->format].s_bpp;
        struct vmw_surface_dma *cmd = (struct vmw_surface_dma *)cmd_space;

        for (i = 0; i < srf->num_sizes; ++i) {
                SVGA3dCmdHeader *header = &cmd->header;
                SVGA3dCmdSurfaceDMA *body = &cmd->body;
                SVGA3dCopyBox *cb = &cmd->cb;
                SVGA3dCmdSurfaceDMASuffix *suffix = &cmd->suffix;
                const struct vmw_surface_offset *cur_offset = &srf->offsets[i];
                const struct drm_vmw_size *cur_size = &srf->sizes[i];

                header->id = SVGA_3D_CMD_SURFACE_DMA;
                header->size = sizeof(*body) + sizeof(*cb) + sizeof(*suffix);

                body->guest.ptr = *ptr;
                body->guest.ptr.offset += cur_offset->bo_offset;
                body->guest.pitch = (cur_size->width * stride_bpp + 7) >> 3;
                body->host.sid = srf->res.id;
                body->host.face = cur_offset->face;
                body->host.mipmap = cur_offset->mip;
                body->transfer = ((to_surface) ?  SVGA3D_WRITE_HOST_VRAM :
                                  SVGA3D_READ_HOST_VRAM);
                cb->x = 0;
                cb->y = 0;
                cb->z = 0;
                cb->srcx = 0;
                cb->srcy = 0;
                cb->srcz = 0;
                cb->w = cur_size->width;
                cb->h = cur_size->height;
                cb->d = cur_size->depth;

                suffix->suffixSize = sizeof(*suffix);
                suffix->maximumOffset = body->guest.pitch*cur_size->height*
                        cur_size->depth*bpp / stride_bpp;
                suffix->flags.discard = 0;
                suffix->flags.unsynchronized = 0;
                suffix->flags.reserved = 0;
                ++cmd;
        }
};


static void vmw_hw_surface_destroy(struct vmw_resource *res)
{

        struct vmw_private *dev_priv = res->dev_priv;
        struct vmw_surface *srf;
        void *cmd;

        if (res->id != -1) {

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

                vmw_surface_destroy_encode(res->id, cmd);
                vmw_fifo_commit(dev_priv, vmw_surface_destroy_size());

                /*
                 * used_memory_size_atomic, or separate lock
                 * to avoid taking dev_priv::cmdbuf_mutex in
                 * the destroy path.
                 */

                mutex_lock(&dev_priv->cmdbuf_mutex);
                srf = container_of(res, struct vmw_surface, res);
                dev_priv->used_memory_size -= srf->backup_size;
                mutex_unlock(&dev_priv->cmdbuf_mutex);

        }
        vmw_3d_resource_dec(dev_priv, false);
}

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

        if (srf->backup)
                ttm_bo_unref(&srf->backup);
        kfree(srf->offsets);
        kfree(srf->sizes);
        kfree(srf->snooper.image);
        kfree(srf);
}


/**
 * vmw_surface_do_validate - make a surface available to the device.
 *
 * @dev_priv: Pointer to a device private struct.
 * @srf: Pointer to a struct vmw_surface.
 *
 * If the surface doesn't have a hw id, allocate one, and optionally
 * DMA the backed up surface contents to the device.
 *
 * Returns -EBUSY if there wasn't sufficient device resources to
 * complete the validation. Retry after freeing up resources.
 *
 * May return other errors if the kernel is out of guest resources.
 */
int vmw_surface_do_validate(struct vmw_private *dev_priv,
                            struct vmw_surface *srf)
{
        struct vmw_resource *res = &srf->res;
        struct list_head val_list;
        struct ttm_validate_buffer val_buf;
        uint32_t submit_size;
        uint8_t *cmd;
        int ret;

        if (likely(res->id != -1))
                return 0;

        if (unlikely(dev_priv->used_memory_size + srf->backup_size >=
                     dev_priv->memory_size))
                return -EBUSY;

        /*
         * Reserve- and validate the backup DMA bo.
         */

        if (srf->backup) {
                INIT_LIST_HEAD(&val_list);
                val_buf.bo = ttm_bo_reference(srf->backup);
                val_buf.new_sync_obj_arg = (void *)((unsigned long)
                                                    DRM_VMW_FENCE_FLAG_EXEC);
                list_add_tail(&val_buf.head, &val_list);
                ret = ttm_eu_reserve_buffers(&val_list);
                if (unlikely(ret != 0))
                        goto out_no_reserve;

                ret = ttm_bo_validate(srf->backup, &vmw_srf_placement,
                                      true, false, false);
                if (unlikely(ret != 0))
                        goto out_no_validate;
        }

        /*
         * Alloc id for the resource.
         */

        ret = vmw_resource_alloc_id(dev_priv, res);
        if (unlikely(ret != 0)) {
                DRM_ERROR("Failed to allocate a surface id.\n");
                goto out_no_id;
        }
        if (unlikely(res->id >= SVGA3D_MAX_SURFACE_IDS)) {
                ret = -EBUSY;
                goto out_no_fifo;
        }


        /*
         * Encode surface define- and dma commands.
         */

        submit_size = vmw_surface_define_size(srf);
        if (srf->backup)
                submit_size += vmw_surface_dma_size(srf);

        cmd = vmw_fifo_reserve(dev_priv, submit_size);
        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Failed reserving FIFO space for surface "
                          "validation.\n");
                ret = -ENOMEM;
                goto out_no_fifo;
        }

        vmw_surface_define_encode(srf, cmd);
        if (srf->backup) {
                SVGAGuestPtr ptr;

                cmd += vmw_surface_define_size(srf);
                vmw_bo_get_guest_ptr(srf->backup, &ptr);
                vmw_surface_dma_encode(srf, cmd, &ptr, true);
        }

        vmw_fifo_commit(dev_priv, submit_size);

        /*
         * Create a fence object and fence the backup buffer.
         */

        if (srf->backup) {
                struct vmw_fence_obj *fence;

                (void) vmw_execbuf_fence_commands(NULL, dev_priv,
                                                  &fence, NULL);
                ttm_eu_fence_buffer_objects(&val_list, fence);
                if (likely(fence != NULL))
                        vmw_fence_obj_unreference(&fence);
                ttm_bo_unref(&val_buf.bo);
                ttm_bo_unref(&srf->backup);
        }

        /*
         * Surface memory usage accounting.
         */

        dev_priv->used_memory_size += srf->backup_size;

        return 0;

out_no_fifo:
        vmw_resource_release_id(res);
out_no_id:
out_no_validate:
        if (srf->backup)
                ttm_eu_backoff_reservation(&val_list);
out_no_reserve:
        if (srf->backup)
                ttm_bo_unref(&val_buf.bo);
        return ret;
}

/**
 * vmw_surface_evict - Evict a hw surface.
 *
 * @dev_priv: Pointer to a device private struct.
 * @srf: Pointer to a struct vmw_surface
 *
 * DMA the contents of a hw surface to a backup guest buffer object,
 * and destroy the hw surface, releasing its id.
 */
int vmw_surface_evict(struct vmw_private *dev_priv,
                      struct vmw_surface *srf)
{
        struct vmw_resource *res = &srf->res;
        struct list_head val_list;
        struct ttm_validate_buffer val_buf;
        uint32_t submit_size;
        uint8_t *cmd;
        int ret;
        struct vmw_fence_obj *fence;
        SVGAGuestPtr ptr;

        BUG_ON(res->id == -1);

        /*
         * Create a surface backup buffer object.
         */

        if (!srf->backup) {
                ret = ttm_bo_create(&dev_priv->bdev, srf->backup_size,
                                    ttm_bo_type_device,
                                    &vmw_srf_placement, 0, 0, true,
                                    NULL, &srf->backup);
                if (unlikely(ret != 0))
                        return ret;
        }

        /*
         * Reserve- and validate the backup DMA bo.
         */

        INIT_LIST_HEAD(&val_list);
        val_buf.bo = ttm_bo_reference(srf->backup);
        val_buf.new_sync_obj_arg = (void *)(unsigned long)
                DRM_VMW_FENCE_FLAG_EXEC;
        list_add_tail(&val_buf.head, &val_list);
        ret = ttm_eu_reserve_buffers(&val_list);
        if (unlikely(ret != 0))
                goto out_no_reserve;

        ret = ttm_bo_validate(srf->backup, &vmw_srf_placement,
                              true, false, false);
        if (unlikely(ret != 0))
                goto out_no_validate;


        /*
         * Encode the dma- and surface destroy commands.
         */

        submit_size = vmw_surface_dma_size(srf) + vmw_surface_destroy_size();
        cmd = vmw_fifo_reserve(dev_priv, submit_size);
        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Failed reserving FIFO space for surface "
                          "eviction.\n");
                ret = -ENOMEM;
                goto out_no_fifo;
        }

        vmw_bo_get_guest_ptr(srf->backup, &ptr);
        vmw_surface_dma_encode(srf, cmd, &ptr, false);
        cmd += vmw_surface_dma_size(srf);
        vmw_surface_destroy_encode(res->id, cmd);
        vmw_fifo_commit(dev_priv, submit_size);

        /*
         * Surface memory usage accounting.
         */

        dev_priv->used_memory_size -= srf->backup_size;

        /*
         * Create a fence object and fence the DMA buffer.
         */

        (void) vmw_execbuf_fence_commands(NULL, dev_priv,
                                          &fence, NULL);
        ttm_eu_fence_buffer_objects(&val_list, fence);
        if (likely(fence != NULL))
                vmw_fence_obj_unreference(&fence);
        ttm_bo_unref(&val_buf.bo);

        /*
         * Release the surface ID.
         */

        vmw_resource_release_id(res);

        return 0;

out_no_fifo:
out_no_validate:
        if (srf->backup)
                ttm_eu_backoff_reservation(&val_list);
out_no_reserve:
        ttm_bo_unref(&val_buf.bo);
        ttm_bo_unref(&srf->backup);
        return ret;
}


/**
 * vmw_surface_validate - make a surface available to the device, evicting
 * other surfaces if needed.
 *
 * @dev_priv: Pointer to a device private struct.
 * @srf: Pointer to a struct vmw_surface.
 *
 * Try to validate a surface and if it fails due to limited device resources,
 * repeatedly try to evict other surfaces until the request can be
 * acommodated.
 *
 * May return errors if out of resources.
 */
int vmw_surface_validate(struct vmw_private *dev_priv,
                         struct vmw_surface *srf)
{
        int ret;
        struct vmw_surface *evict_srf;

        do {
                write_lock(&dev_priv->resource_lock);
                list_del_init(&srf->lru_head);
                write_unlock(&dev_priv->resource_lock);

                ret = vmw_surface_do_validate(dev_priv, srf);
                if (likely(ret != -EBUSY))
                        break;

                write_lock(&dev_priv->resource_lock);
                if (list_empty(&dev_priv->surface_lru)) {
                        DRM_ERROR("Out of device memory for surfaces.\n");
                        ret = -EBUSY;
                        write_unlock(&dev_priv->resource_lock);
                        break;
                }

                evict_srf = vmw_surface_reference
                        (list_first_entry(&dev_priv->surface_lru,
                                          struct vmw_surface,
                                          lru_head));
                list_del_init(&evict_srf->lru_head);

                write_unlock(&dev_priv->resource_lock);
                (void) vmw_surface_evict(dev_priv, evict_srf);

                vmw_surface_unreference(&evict_srf);

        } while (1);

        if (unlikely(ret != 0 && srf->res.id != -1)) {
                write_lock(&dev_priv->resource_lock);
                list_add_tail(&srf->lru_head, &dev_priv->surface_lru);
                write_unlock(&dev_priv->resource_lock);
        }

        return ret;
}


/**
 * vmw_surface_remove_from_lists - Remove surface resources from lookup lists
 *
 * @res: Pointer to a struct vmw_resource embedded in a struct vmw_surface
 *
 * As part of the resource destruction, remove the surface from any
 * lookup lists.
 */
static void vmw_surface_remove_from_lists(struct vmw_resource *res)
{
        struct vmw_surface *srf = container_of(res, struct vmw_surface, res);

        list_del_init(&srf->lru_head);
}

int vmw_surface_init(struct vmw_private *dev_priv,
                     struct vmw_surface *srf,
                     void (*res_free) (struct vmw_resource *res))
{
        int ret;
        struct vmw_resource *res = &srf->res;

        BUG_ON(res_free == NULL);
        INIT_LIST_HEAD(&srf->lru_head);
        ret = vmw_resource_init(dev_priv, res, &dev_priv->surface_idr,
                                VMW_RES_SURFACE, true, res_free,
                                vmw_surface_remove_from_lists);

        if (unlikely(ret != 0))
                res_free(res);

        /*
         * The surface won't be visible to hardware until a
         * surface validate.
         */

        (void) vmw_3d_resource_inc(dev_priv, false);
        vmw_resource_activate(res, vmw_hw_surface_destroy);
        return ret;
}

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);
        struct vmw_private *dev_priv = srf->res.dev_priv;
        uint32_t size = user_srf->size;

        if (srf->backup)
                ttm_bo_unref(&srf->backup);
        kfree(srf->offsets);
        kfree(srf->sizes);
        kfree(srf->snooper.image);
        kfree(user_srf);
        ttm_mem_global_free(vmw_mem_glob(dev_priv), size);
}

/**
 * vmw_resource_unreserve - unreserve resources previously reserved for
 * command submission.
 *
 * @list_head: list of resources to unreserve.
 *
 * Currently only surfaces are considered, and unreserving a surface
 * means putting it back on the device's surface lru list,
 * so that it can be evicted if necessary.
 * This function traverses the resource list and
 * checks whether resources are surfaces, and in that case puts them back
 * on the device's surface LRU list.
 */
void vmw_resource_unreserve(struct list_head *list)
{
        struct vmw_resource *res;
        struct vmw_surface *srf;
        rwlock_t *lock = NULL;

        list_for_each_entry(res, list, validate_head) {

                if (res->res_free != &vmw_surface_res_free &&
                    res->res_free != &vmw_user_surface_free)
                        continue;

                if (unlikely(lock == NULL)) {
                        lock = &res->dev_priv->resource_lock;
                        write_lock(lock);
                }

                srf = container_of(res, struct vmw_surface, res);
                list_del_init(&srf->lru_head);
                list_add_tail(&srf->lru_head, &res->dev_priv->surface_lru);
        }

        if (lock != NULL)
                write_unlock(lock);
}


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;
        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, j;
        uint32_t cur_bo_offset;
        struct drm_vmw_size *cur_size;
        struct vmw_surface_offset *cur_offset;
        uint32_t stride_bpp;
        uint32_t bpp;
        uint32_t num_sizes;
        uint32_t size;
        struct vmw_master *vmaster = vmw_master(file_priv->master);

        if (unlikely(vmw_user_surface_size == 0))
                vmw_user_surface_size = ttm_round_pot(sizeof(*user_srf)) +
                        128;

        num_sizes = 0;
        for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i)
                num_sizes += req->mip_levels[i];

        if (num_sizes > DRM_VMW_MAX_SURFACE_FACES *
            DRM_VMW_MAX_MIP_LEVELS)
                return -EINVAL;

        size = vmw_user_surface_size + 128 +
                ttm_round_pot(num_sizes * sizeof(struct drm_vmw_size)) +
                ttm_round_pot(num_sizes * sizeof(struct vmw_surface_offset));


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

        ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
                                   size, false, true);
        if (unlikely(ret != 0)) {
                if (ret != -ERESTARTSYS)
                        DRM_ERROR("Out of graphics memory for surface"
                                  " creation.\n");
                goto out_unlock;
        }

        user_srf = kmalloc(sizeof(*user_srf), GFP_KERNEL);
        if (unlikely(user_srf == NULL)) {
                ret = -ENOMEM;
                goto out_no_user_srf;
        }

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

        srf->flags = req->flags;
        srf->format = req->format;
        srf->scanout = req->scanout;
        srf->backup = NULL;

        memcpy(srf->mip_levels, req->mip_levels, sizeof(srf->mip_levels));
        srf->num_sizes = num_sizes;
        user_srf->size = size;

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

        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_no_copy;
        }

        cur_bo_offset = 0;
        cur_offset = srf->offsets;
        cur_size = srf->sizes;

        bpp = vmw_sf_bpp[srf->format].bpp;
        stride_bpp = vmw_sf_bpp[srf->format].s_bpp;

        for (i = 0; i < DRM_VMW_MAX_SURFACE_FACES; ++i) {
                for (j = 0; j < srf->mip_levels[i]; ++j) {
                        uint32_t stride =
                                (cur_size->width * stride_bpp + 7) >> 3;

                        cur_offset->face = i;
                        cur_offset->mip = j;
                        cur_offset->bo_offset = cur_bo_offset;
                        cur_bo_offset += stride * cur_size->height *
                                cur_size->depth * bpp / stride_bpp;
                        ++cur_offset;
                        ++cur_size;
                }
        }
        srf->backup_size = cur_bo_offset;

        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_no_copy;
                }
        } 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))
                goto out_unlock;

        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);
                goto out_unlock;
        }

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

        vmw_resource_unreference(&res);

        ttm_read_unlock(&vmaster->lock);
        return 0;
out_no_copy:
        kfree(srf->offsets);
out_no_offsets:
        kfree(srf->sizes);
out_no_sizes:
        kfree(user_srf);
out_no_user_srf:
        ttm_mem_global_free(vmw_mem_glob(dev_priv), size);
out_unlock:
        ttm_read_unlock(&vmaster->lock);
        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.
 */
void vmw_dmabuf_bo_free(struct ttm_buffer_object *bo)
{
        struct vmw_dma_buffer *vmw_bo = vmw_dma_buffer(bo);

        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;
        size_t acc_size;
        int ret;

        BUG_ON(!bo_free);

        acc_size = ttm_bo_acc_size(bdev, size, sizeof(struct vmw_dma_buffer));
        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);

        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, false, res_free, NULL);

        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);
        struct vmw_private *dev_priv = res->dev_priv;

        kfree(stream);
        ttm_mem_global_free(vmw_mem_glob(dev_priv),
                            vmw_user_stream_size);
}

/**
 * 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;
        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;
        struct vmw_master *vmaster = vmw_master(file_priv->master);
        int ret;

        /*
         * Approximate idr memory usage with 128 bytes. It will be limited
         * by maximum number_of streams anyway?
         */

        if (unlikely(vmw_user_stream_size == 0))
                vmw_user_stream_size = ttm_round_pot(sizeof(*stream)) + 128;

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

        ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
                                   vmw_user_stream_size,
                                   false, true);
        if (unlikely(ret != 0)) {
                if (ret != -ERESTARTSYS)
                        DRM_ERROR("Out of graphics memory for stream"
                                  " creation.\n");
                goto out_unlock;
        }


        stream = kmalloc(sizeof(*stream), GFP_KERNEL);
        if (unlikely(stream == NULL)) {
                ttm_mem_global_free(vmw_mem_glob(dev_priv),
                                    vmw_user_stream_size);
                ret = -ENOMEM;
                goto out_unlock;
        }

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

        /*
         * From here on, the destructor takes over resource freeing.
         */

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

        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);
out_unlock:
        ttm_read_unlock(&vmaster->lock);
        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;
}