/**************************************************************************
 *
 * Copyright © 2015 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.
 *
 **************************************************************************/
/*
 * This file implements the vmwgfx context binding manager,
 * The sole reason for having to use this code is that vmware guest
 * backed contexts can be swapped out to their backing mobs by the device
 * at any time, also swapped in at any time. At swapin time, the device
 * validates the context bindings to make sure they point to valid resources.
 * It's this outside-of-drawcall validation (that can happen at any time),
 * that makes this code necessary.
 *
 * We therefore need to kill any context bindings pointing to a resource
 * when the resource is swapped out. Furthermore, if the vmwgfx driver has
 * swapped out the context we can't swap it in again to kill bindings because
 * of backing mob reservation lockdep violations, so as part of
 * context swapout, also kill all bindings of a context, so that they are
 * already killed if a resource to which a binding points
 * needs to be swapped out.
 *
 * Note that a resource can be pointed to by bindings from multiple contexts,
 * Therefore we can't easily protect this data by a per context mutex
 * (unless we use deadlock-safe WW mutexes). So we use a global binding_mutex
 * to protect all binding manager data.
 *
 * Finally, any association between a context and a global resource
 * (surface, shader or even DX query) is conceptually a context binding that
 * needs to be tracked by this code.
 */

#include "vmwgfx_drv.h"
#include "vmwgfx_binding.h"
#include "device_include/svga3d_reg.h"

#define VMW_BINDING_RT_BIT     0
#define VMW_BINDING_PS_BIT     1
#define VMW_BINDING_SO_BIT     2
#define VMW_BINDING_VB_BIT     3
#define VMW_BINDING_NUM_BITS   4

#define VMW_BINDING_PS_SR_BIT  0

/**
 * struct vmw_ctx_binding_state - per context binding state
 *
 * @dev_priv: Pointer to device private structure.
 * @list: linked list of individual active bindings.
 * @render_targets: Render target bindings.
 * @texture_units: Texture units bindings.
 * @ds_view: Depth-stencil view binding.
 * @so_targets: StreamOutput target bindings.
 * @vertex_buffers: Vertex buffer bindings.
 * @index_buffer: Index buffer binding.
 * @per_shader: Per shader-type bindings.
 * @dirty: Bitmap tracking per binding-type changes that have not yet
 * been emitted to the device.
 * @dirty_vb: Bitmap tracking individual vertex buffer binding changes that
 * have not yet been emitted to the device.
 * @bind_cmd_buffer: Scratch space used to construct binding commands.
 * @bind_cmd_count: Number of binding command data entries in @bind_cmd_buffer
 * @bind_first_slot: Used together with @bind_cmd_buffer to indicate the
 * device binding slot of the first command data entry in @bind_cmd_buffer.
 *
 * Note that this structure also provides storage space for the individual
 * struct vmw_ctx_binding objects, so that no dynamic allocation is needed
 * for individual bindings.
 *
 */
struct vmw_ctx_binding_state {
        struct vmw_private *dev_priv;
        struct list_head list;
        struct vmw_ctx_bindinfo_view render_targets[SVGA3D_RT_MAX];
        struct vmw_ctx_bindinfo_tex texture_units[SVGA3D_NUM_TEXTURE_UNITS];
        struct vmw_ctx_bindinfo_view ds_view;
        struct vmw_ctx_bindinfo_so so_targets[SVGA3D_DX_MAX_SOTARGETS];
        struct vmw_ctx_bindinfo_vb vertex_buffers[SVGA3D_DX_MAX_VERTEXBUFFERS];
        struct vmw_ctx_bindinfo_ib index_buffer;
        struct vmw_dx_shader_bindings per_shader[SVGA3D_NUM_SHADERTYPE_DX10];

        unsigned long dirty;
        DECLARE_BITMAP(dirty_vb, SVGA3D_DX_MAX_VERTEXBUFFERS);

        u32 bind_cmd_buffer[VMW_MAX_VIEW_BINDINGS];
        u32 bind_cmd_count;
        u32 bind_first_slot;
};

static int vmw_binding_scrub_shader(struct vmw_ctx_bindinfo *bi, bool rebind);
static int vmw_binding_scrub_render_target(struct vmw_ctx_bindinfo *bi,
                                           bool rebind);
static int vmw_binding_scrub_texture(struct vmw_ctx_bindinfo *bi, bool rebind);
static int vmw_binding_scrub_cb(struct vmw_ctx_bindinfo *bi, bool rebind);
static int vmw_binding_scrub_dx_rt(struct vmw_ctx_bindinfo *bi, bool rebind);
static int vmw_binding_scrub_sr(struct vmw_ctx_bindinfo *bi, bool rebind);
static int vmw_binding_scrub_so(struct vmw_ctx_bindinfo *bi, bool rebind);
static int vmw_binding_emit_dirty(struct vmw_ctx_binding_state *cbs);
static int vmw_binding_scrub_dx_shader(struct vmw_ctx_bindinfo *bi,
                                       bool rebind);
static int vmw_binding_scrub_ib(struct vmw_ctx_bindinfo *bi, bool rebind);
static int vmw_binding_scrub_vb(struct vmw_ctx_bindinfo *bi, bool rebind);
static void vmw_binding_build_asserts(void) __attribute__ ((unused));

typedef int (*vmw_scrub_func)(struct vmw_ctx_bindinfo *, bool);

/**
 * struct vmw_binding_info - Per binding type information for the binding
 * manager
 *
 * @size: The size of the struct binding derived from a struct vmw_ctx_bindinfo.
 * @offsets: array[shader_slot] of offsets to the array[slot]
 * of struct bindings for the binding type.
 * @scrub_func: Pointer to the scrub function for this binding type.
 *
 * Holds static information to help optimize the binding manager and avoid
 * an excessive amount of switch statements.
 */
struct vmw_binding_info {
        size_t size;
        const size_t *offsets;
        vmw_scrub_func scrub_func;
};

/*
 * A number of static variables that help determine the scrub func and the
 * location of the struct vmw_ctx_bindinfo slots for each binding type.
 */
static const size_t vmw_binding_shader_offsets[] = {
        offsetof(struct vmw_ctx_binding_state, per_shader[0].shader),
        offsetof(struct vmw_ctx_binding_state, per_shader[1].shader),
        offsetof(struct vmw_ctx_binding_state, per_shader[2].shader),
};
static const size_t vmw_binding_rt_offsets[] = {
        offsetof(struct vmw_ctx_binding_state, render_targets),
};
static const size_t vmw_binding_tex_offsets[] = {
        offsetof(struct vmw_ctx_binding_state, texture_units),
};
static const size_t vmw_binding_cb_offsets[] = {
        offsetof(struct vmw_ctx_binding_state, per_shader[0].const_buffers),
        offsetof(struct vmw_ctx_binding_state, per_shader[1].const_buffers),
        offsetof(struct vmw_ctx_binding_state, per_shader[2].const_buffers),
};
static const size_t vmw_binding_dx_ds_offsets[] = {
        offsetof(struct vmw_ctx_binding_state, ds_view),
};
static const size_t vmw_binding_sr_offsets[] = {
        offsetof(struct vmw_ctx_binding_state, per_shader[0].shader_res),
        offsetof(struct vmw_ctx_binding_state, per_shader[1].shader_res),
        offsetof(struct vmw_ctx_binding_state, per_shader[2].shader_res),
};
static const size_t vmw_binding_so_offsets[] = {
        offsetof(struct vmw_ctx_binding_state, so_targets),
};
static const size_t vmw_binding_vb_offsets[] = {
        offsetof(struct vmw_ctx_binding_state, vertex_buffers),
};
static const size_t vmw_binding_ib_offsets[] = {
        offsetof(struct vmw_ctx_binding_state, index_buffer),
};

static const struct vmw_binding_info vmw_binding_infos[] = {
        [vmw_ctx_binding_shader] = {
                .size = sizeof(struct vmw_ctx_bindinfo_shader),
                .offsets = vmw_binding_shader_offsets,
                .scrub_func = vmw_binding_scrub_shader},
        [vmw_ctx_binding_rt] = {
                .size = sizeof(struct vmw_ctx_bindinfo_view),
                .offsets = vmw_binding_rt_offsets,
                .scrub_func = vmw_binding_scrub_render_target},
        [vmw_ctx_binding_tex] = {
                .size = sizeof(struct vmw_ctx_bindinfo_tex),
                .offsets = vmw_binding_tex_offsets,
                .scrub_func = vmw_binding_scrub_texture},
        [vmw_ctx_binding_cb] = {
                .size = sizeof(struct vmw_ctx_bindinfo_cb),
                .offsets = vmw_binding_cb_offsets,
                .scrub_func = vmw_binding_scrub_cb},
        [vmw_ctx_binding_dx_shader] = {
                .size = sizeof(struct vmw_ctx_bindinfo_shader),
                .offsets = vmw_binding_shader_offsets,
                .scrub_func = vmw_binding_scrub_dx_shader},
        [vmw_ctx_binding_dx_rt] = {
                .size = sizeof(struct vmw_ctx_bindinfo_view),
                .offsets = vmw_binding_rt_offsets,
                .scrub_func = vmw_binding_scrub_dx_rt},
        [vmw_ctx_binding_sr] = {
                .size = sizeof(struct vmw_ctx_bindinfo_view),
                .offsets = vmw_binding_sr_offsets,
                .scrub_func = vmw_binding_scrub_sr},
        [vmw_ctx_binding_ds] = {
                .size = sizeof(struct vmw_ctx_bindinfo_view),
                .offsets = vmw_binding_dx_ds_offsets,
                .scrub_func = vmw_binding_scrub_dx_rt},
        [vmw_ctx_binding_so] = {
                .size = sizeof(struct vmw_ctx_bindinfo_so),
                .offsets = vmw_binding_so_offsets,
                .scrub_func = vmw_binding_scrub_so},
        [vmw_ctx_binding_vb] = {
                .size = sizeof(struct vmw_ctx_bindinfo_vb),
                .offsets = vmw_binding_vb_offsets,
                .scrub_func = vmw_binding_scrub_vb},
        [vmw_ctx_binding_ib] = {
                .size = sizeof(struct vmw_ctx_bindinfo_ib),
                .offsets = vmw_binding_ib_offsets,
                .scrub_func = vmw_binding_scrub_ib},
};

/**
 * vmw_cbs_context - Return a pointer to the context resource of a
 * context binding state tracker.
 *
 * @cbs: The context binding state tracker.
 *
 * Provided there are any active bindings, this function will return an
 * unreferenced pointer to the context resource that owns the context
 * binding state tracker. If there are no active bindings, this function
 * will return NULL. Note that the caller must somehow ensure that a reference
 * is held on the context resource prior to calling this function.
 */
static const struct vmw_resource *
vmw_cbs_context(const struct vmw_ctx_binding_state *cbs)
{
        if (list_empty(&cbs->list))
                return NULL;

        return list_first_entry(&cbs->list, struct vmw_ctx_bindinfo,
                                ctx_list)->ctx;
}

/**
 * vmw_binding_loc - determine the struct vmw_ctx_bindinfo slot location.
 *
 * @cbs: Pointer to a struct vmw_ctx_binding state which holds the slot.
 * @bt: The binding type.
 * @shader_slot: The shader slot of the binding. If none, then set to 0.
 * @slot: The slot of the binding.
 */
static struct vmw_ctx_bindinfo *
vmw_binding_loc(struct vmw_ctx_binding_state *cbs,
                enum vmw_ctx_binding_type bt, u32 shader_slot, u32 slot)
{
        const struct vmw_binding_info *b = &vmw_binding_infos[bt];
        size_t offset = b->offsets[shader_slot] + b->size*slot;

        return (struct vmw_ctx_bindinfo *)((u8 *) cbs + offset);
}

/**
 * vmw_binding_drop: Stop tracking a context binding
 *
 * @bi: Pointer to binding tracker storage.
 *
 * Stops tracking a context binding, and re-initializes its storage.
 * Typically used when the context binding is replaced with a binding to
 * another (or the same, for that matter) resource.
 */
static void vmw_binding_drop(struct vmw_ctx_bindinfo *bi)
{
        list_del(&bi->ctx_list);
        if (!list_empty(&bi->res_list))
                list_del(&bi->res_list);
        bi->ctx = NULL;
}

/**
 * vmw_binding_add: Start tracking a context binding
 *
 * @cbs: Pointer to the context binding state tracker.
 * @bi: Information about the binding to track.
 *
 * Starts tracking the binding in the context binding
 * state structure @cbs.
 */
void vmw_binding_add(struct vmw_ctx_binding_state *cbs,
                    const struct vmw_ctx_bindinfo *bi,
                    u32 shader_slot, u32 slot)
{
        struct vmw_ctx_bindinfo *loc =
                vmw_binding_loc(cbs, bi->bt, shader_slot, slot);
        const struct vmw_binding_info *b = &vmw_binding_infos[bi->bt];

        if (loc->ctx != NULL)
                vmw_binding_drop(loc);

        memcpy(loc, bi, b->size);
        loc->scrubbed = false;
        list_add(&loc->ctx_list, &cbs->list);
        INIT_LIST_HEAD(&loc->res_list);
}

/**
 * vmw_binding_transfer: Transfer a context binding tracking entry.
 *
 * @cbs: Pointer to the persistent context binding state tracker.
 * @bi: Information about the binding to track.
 *
 */
static void vmw_binding_transfer(struct vmw_ctx_binding_state *cbs,
                                 const struct vmw_ctx_binding_state *from,
                                 const struct vmw_ctx_bindinfo *bi)
{
        size_t offset = (unsigned long)bi - (unsigned long)from;
        struct vmw_ctx_bindinfo *loc = (struct vmw_ctx_bindinfo *)
                ((unsigned long) cbs + offset);

        if (loc->ctx != NULL) {
                WARN_ON(bi->scrubbed);

                vmw_binding_drop(loc);
        }

        if (bi->res != NULL) {
                memcpy(loc, bi, vmw_binding_infos[bi->bt].size);
                list_add_tail(&loc->ctx_list, &cbs->list);
                list_add_tail(&loc->res_list, &loc->res->binding_head);
        }
}

/**
 * vmw_binding_state_kill - Kill all bindings associated with a
 * struct vmw_ctx_binding state structure, and re-initialize the structure.
 *
 * @cbs: Pointer to the context binding state tracker.
 *
 * Emits commands to scrub all bindings associated with the
 * context binding state tracker. Then re-initializes the whole structure.
 */
void vmw_binding_state_kill(struct vmw_ctx_binding_state *cbs)
{
        struct vmw_ctx_bindinfo *entry, *next;

        vmw_binding_state_scrub(cbs);
        list_for_each_entry_safe(entry, next, &cbs->list, ctx_list)
                vmw_binding_drop(entry);
}

/**
 * vmw_binding_state_scrub - Scrub all bindings associated with a
 * struct vmw_ctx_binding state structure.
 *
 * @cbs: Pointer to the context binding state tracker.
 *
 * Emits commands to scrub all bindings associated with the
 * context binding state tracker.
 */
void vmw_binding_state_scrub(struct vmw_ctx_binding_state *cbs)
{
        struct vmw_ctx_bindinfo *entry;

        list_for_each_entry(entry, &cbs->list, ctx_list) {
                if (!entry->scrubbed) {
                        (void) vmw_binding_infos[entry->bt].scrub_func
                                (entry, false);
                        entry->scrubbed = true;
                }
        }

        (void) vmw_binding_emit_dirty(cbs);
}

/**
 * vmw_binding_res_list_kill - Kill all bindings on a
 * resource binding list
 *
 * @head: list head of resource binding list
 *
 * Kills all bindings associated with a specific resource. Typically
 * called before the resource is destroyed.
 */
void vmw_binding_res_list_kill(struct list_head *head)
{
        struct vmw_ctx_bindinfo *entry, *next;

        vmw_binding_res_list_scrub(head);
        list_for_each_entry_safe(entry, next, head, res_list)
                vmw_binding_drop(entry);
}

/**
 * vmw_binding_res_list_scrub - Scrub all bindings on a
 * resource binding list
 *
 * @head: list head of resource binding list
 *
 * Scrub all bindings associated with a specific resource. Typically
 * called before the resource is evicted.
 */
void vmw_binding_res_list_scrub(struct list_head *head)
{
        struct vmw_ctx_bindinfo *entry;

        list_for_each_entry(entry, head, res_list) {
                if (!entry->scrubbed) {
                        (void) vmw_binding_infos[entry->bt].scrub_func
                                (entry, false);
                        entry->scrubbed = true;
                }
        }

        list_for_each_entry(entry, head, res_list) {
                struct vmw_ctx_binding_state *cbs =
                        vmw_context_binding_state(entry->ctx);

                (void) vmw_binding_emit_dirty(cbs);
        }
}


/**
 * vmw_binding_state_commit - Commit staged binding info
 *
 * @ctx: Pointer to context to commit the staged binding info to.
 * @from: Staged binding info built during execbuf.
 * @scrubbed: Transfer only scrubbed bindings.
 *
 * Transfers binding info from a temporary structure
 * (typically used by execbuf) to the persistent
 * structure in the context. This can be done once commands have been
 * submitted to hardware
 */
void vmw_binding_state_commit(struct vmw_ctx_binding_state *to,
                              struct vmw_ctx_binding_state *from)
{
        struct vmw_ctx_bindinfo *entry, *next;

        list_for_each_entry_safe(entry, next, &from->list, ctx_list) {
                vmw_binding_transfer(to, from, entry);
                vmw_binding_drop(entry);
        }
}

/**
 * vmw_binding_rebind_all - Rebind all scrubbed bindings of a context
 *
 * @ctx: The context resource
 *
 * Walks through the context binding list and rebinds all scrubbed
 * resources.
 */
int vmw_binding_rebind_all(struct vmw_ctx_binding_state *cbs)
{
        struct vmw_ctx_bindinfo *entry;
        int ret;

        list_for_each_entry(entry, &cbs->list, ctx_list) {
                if (likely(!entry->scrubbed))
                        continue;

                if ((entry->res == NULL || entry->res->id ==
                            SVGA3D_INVALID_ID))
                        continue;

                ret = vmw_binding_infos[entry->bt].scrub_func(entry, true);
                if (unlikely(ret != 0))
                        return ret;

                entry->scrubbed = false;
        }

        return vmw_binding_emit_dirty(cbs);
}

/**
 * vmw_binding_scrub_shader - scrub a shader binding from a context.
 *
 * @bi: single binding information.
 * @rebind: Whether to issue a bind instead of scrub command.
 */
static int vmw_binding_scrub_shader(struct vmw_ctx_bindinfo *bi, bool rebind)
{
        struct vmw_ctx_bindinfo_shader *binding =
                container_of(bi, typeof(*binding), bi);
        struct vmw_private *dev_priv = bi->ctx->dev_priv;
        struct {
                SVGA3dCmdHeader header;
                SVGA3dCmdSetShader body;
        } *cmd;

        cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Failed reserving FIFO space for shader "
                          "unbinding.\n");
                return -ENOMEM;
        }

        cmd->header.id = SVGA_3D_CMD_SET_SHADER;
        cmd->header.size = sizeof(cmd->body);
        cmd->body.cid = bi->ctx->id;
        cmd->body.type = binding->shader_slot + SVGA3D_SHADERTYPE_MIN;
        cmd->body.shid = ((rebind) ? bi->res->id : SVGA3D_INVALID_ID);
        vmw_fifo_commit(dev_priv, sizeof(*cmd));

        return 0;
}

/**
 * vmw_binding_scrub_render_target - scrub a render target binding
 * from a context.
 *
 * @bi: single binding information.
 * @rebind: Whether to issue a bind instead of scrub command.
 */
static int vmw_binding_scrub_render_target(struct vmw_ctx_bindinfo *bi,
                                           bool rebind)
{
        struct vmw_ctx_bindinfo_view *binding =
                container_of(bi, typeof(*binding), bi);
        struct vmw_private *dev_priv = bi->ctx->dev_priv;
        struct {
                SVGA3dCmdHeader header;
                SVGA3dCmdSetRenderTarget body;
        } *cmd;

        cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Failed reserving FIFO space for render target "
                          "unbinding.\n");
                return -ENOMEM;
        }

        cmd->header.id = SVGA_3D_CMD_SETRENDERTARGET;
        cmd->header.size = sizeof(cmd->body);
        cmd->body.cid = bi->ctx->id;
        cmd->body.type = binding->slot;
        cmd->body.target.sid = ((rebind) ? bi->res->id : SVGA3D_INVALID_ID);
        cmd->body.target.face = 0;
        cmd->body.target.mipmap = 0;
        vmw_fifo_commit(dev_priv, sizeof(*cmd));

        return 0;
}

/**
 * vmw_binding_scrub_texture - scrub a texture binding from a context.
 *
 * @bi: single binding information.
 * @rebind: Whether to issue a bind instead of scrub command.
 *
 * TODO: Possibly complement this function with a function that takes
 * a list of texture bindings and combines them to a single command.
 */
static int vmw_binding_scrub_texture(struct vmw_ctx_bindinfo *bi,
                                     bool rebind)
{
        struct vmw_ctx_bindinfo_tex *binding =
                container_of(bi, typeof(*binding), bi);
        struct vmw_private *dev_priv = bi->ctx->dev_priv;
        struct {
                SVGA3dCmdHeader header;
                struct {
                        SVGA3dCmdSetTextureState c;
                        SVGA3dTextureState s1;
                } body;
        } *cmd;

        cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Failed reserving FIFO space for texture "
                          "unbinding.\n");
                return -ENOMEM;
        }

        cmd->header.id = SVGA_3D_CMD_SETTEXTURESTATE;
        cmd->header.size = sizeof(cmd->body);
        cmd->body.c.cid = bi->ctx->id;
        cmd->body.s1.stage = binding->texture_stage;
        cmd->body.s1.name = SVGA3D_TS_BIND_TEXTURE;
        cmd->body.s1.value = ((rebind) ? bi->res->id : SVGA3D_INVALID_ID);
        vmw_fifo_commit(dev_priv, sizeof(*cmd));

        return 0;
}

/**
 * vmw_binding_scrub_dx_shader - scrub a dx shader binding from a context.
 *
 * @bi: single binding information.
 * @rebind: Whether to issue a bind instead of scrub command.
 */
static int vmw_binding_scrub_dx_shader(struct vmw_ctx_bindinfo *bi, bool rebind)
{
        struct vmw_ctx_bindinfo_shader *binding =
                container_of(bi, typeof(*binding), bi);
        struct vmw_private *dev_priv = bi->ctx->dev_priv;
        struct {
                SVGA3dCmdHeader header;
                SVGA3dCmdDXSetShader body;
        } *cmd;

        cmd = vmw_fifo_reserve_dx(dev_priv, sizeof(*cmd), bi->ctx->id);
        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Failed reserving FIFO space for DX shader "
                          "unbinding.\n");
                return -ENOMEM;
        }
        cmd->header.id = SVGA_3D_CMD_DX_SET_SHADER;
        cmd->header.size = sizeof(cmd->body);
        cmd->body.type = binding->shader_slot + SVGA3D_SHADERTYPE_MIN;
        cmd->body.shaderId = ((rebind) ? bi->res->id : SVGA3D_INVALID_ID);
        vmw_fifo_commit(dev_priv, sizeof(*cmd));

        return 0;
}

/**
 * vmw_binding_scrub_cb - scrub a constant buffer binding from a context.
 *
 * @bi: single binding information.
 * @rebind: Whether to issue a bind instead of scrub command.
 */
static int vmw_binding_scrub_cb(struct vmw_ctx_bindinfo *bi, bool rebind)
{
        struct vmw_ctx_bindinfo_cb *binding =
                container_of(bi, typeof(*binding), bi);
        struct vmw_private *dev_priv = bi->ctx->dev_priv;
        struct {
                SVGA3dCmdHeader header;
                SVGA3dCmdDXSetSingleConstantBuffer body;
        } *cmd;

        cmd = vmw_fifo_reserve_dx(dev_priv, sizeof(*cmd), bi->ctx->id);
        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Failed reserving FIFO space for DX shader "
                          "unbinding.\n");
                return -ENOMEM;
        }

        cmd->header.id = SVGA_3D_CMD_DX_SET_SINGLE_CONSTANT_BUFFER;
        cmd->header.size = sizeof(cmd->body);
        cmd->body.slot = binding->slot;
        cmd->body.type = binding->shader_slot + SVGA3D_SHADERTYPE_MIN;
        if (rebind) {
                cmd->body.offsetInBytes = binding->offset;
                cmd->body.sizeInBytes = binding->size;
                cmd->body.sid = bi->res->id;
        } else {
                cmd->body.offsetInBytes = 0;
                cmd->body.sizeInBytes = 0;
                cmd->body.sid = SVGA3D_INVALID_ID;
        }
        vmw_fifo_commit(dev_priv, sizeof(*cmd));

        return 0;
}

/**
 * vmw_collect_view_ids - Build view id data for a view binding command
 * without checking which bindings actually need to be emitted
 *
 * @cbs: Pointer to the context's struct vmw_ctx_binding_state
 * @bi: Pointer to where the binding info array is stored in @cbs
 * @max_num: Maximum number of entries in the @bi array.
 *
 * Scans the @bi array for bindings and builds a buffer of view id data.
 * Stops at the first non-existing binding in the @bi array.
 * On output, @cbs->bind_cmd_count contains the number of bindings to be
 * emitted, @cbs->bind_first_slot is set to zero, and @cbs->bind_cmd_buffer
 * contains the command data.
 */
static void vmw_collect_view_ids(struct vmw_ctx_binding_state *cbs,
                                 const struct vmw_ctx_bindinfo *bi,
                                 u32 max_num)
{
        const struct vmw_ctx_bindinfo_view *biv =
                container_of(bi, struct vmw_ctx_bindinfo_view, bi);
        unsigned long i;

        cbs->bind_cmd_count = 0;
        cbs->bind_first_slot = 0;

        for (i = 0; i < max_num; ++i, ++biv) {
                if (!biv->bi.ctx)
                        break;

                cbs->bind_cmd_buffer[cbs->bind_cmd_count++] =
                        ((biv->bi.scrubbed) ?
                         SVGA3D_INVALID_ID : biv->bi.res->id);
        }
}

/**
 * vmw_collect_dirty_view_ids - Build view id data for a view binding command
 *
 * @cbs: Pointer to the context's struct vmw_ctx_binding_state
 * @bi: Pointer to where the binding info array is stored in @cbs
 * @dirty: Bitmap indicating which bindings need to be emitted.
 * @max_num: Maximum number of entries in the @bi array.
 *
 * Scans the @bi array for bindings that need to be emitted and
 * builds a buffer of view id data.
 * On output, @cbs->bind_cmd_count contains the number of bindings to be
 * emitted, @cbs->bind_first_slot indicates the index of the first emitted
 * binding, and @cbs->bind_cmd_buffer contains the command data.
 */
static void vmw_collect_dirty_view_ids(struct vmw_ctx_binding_state *cbs,
                                       const struct vmw_ctx_bindinfo *bi,
                                       unsigned long *dirty,
                                       u32 max_num)
{
        const struct vmw_ctx_bindinfo_view *biv =
                container_of(bi, struct vmw_ctx_bindinfo_view, bi);
        unsigned long i, next_bit;

        cbs->bind_cmd_count = 0;
        i = find_first_bit(dirty, max_num);
        next_bit = i;
        cbs->bind_first_slot = i;

        biv += i;
        for (; i < max_num; ++i, ++biv) {
                cbs->bind_cmd_buffer[cbs->bind_cmd_count++] =
                        ((!biv->bi.ctx || biv->bi.scrubbed) ?
                         SVGA3D_INVALID_ID : biv->bi.res->id);

                if (next_bit == i) {
                        next_bit = find_next_bit(dirty, max_num, i + 1);
                        if (next_bit >= max_num)
                                break;
                }
        }
}

/**
 * vmw_binding_emit_set_sr - Issue delayed DX shader resource binding commands
 *
 * @cbs: Pointer to the context's struct vmw_ctx_binding_state
 */
static int vmw_emit_set_sr(struct vmw_ctx_binding_state *cbs,
                           int shader_slot)
{
        const struct vmw_ctx_bindinfo *loc =
                &cbs->per_shader[shader_slot].shader_res[0].bi;
        struct {
                SVGA3dCmdHeader header;
                SVGA3dCmdDXSetShaderResources body;
        } *cmd;
        size_t cmd_size, view_id_size;
        const struct vmw_resource *ctx = vmw_cbs_context(cbs);

        vmw_collect_dirty_view_ids(cbs, loc,
                                   cbs->per_shader[shader_slot].dirty_sr,
                                   SVGA3D_DX_MAX_SRVIEWS);
        if (cbs->bind_cmd_count == 0)
                return 0;

        view_id_size = cbs->bind_cmd_count*sizeof(uint32);
        cmd_size = sizeof(*cmd) + view_id_size;
        cmd = vmw_fifo_reserve_dx(ctx->dev_priv, cmd_size, ctx->id);
        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Failed reserving FIFO space for DX shader"
                          " resource binding.\n");
                return -ENOMEM;
        }

        cmd->header.id = SVGA_3D_CMD_DX_SET_SHADER_RESOURCES;
        cmd->header.size = sizeof(cmd->body) + view_id_size;
        cmd->body.type = shader_slot + SVGA3D_SHADERTYPE_MIN;
        cmd->body.startView = cbs->bind_first_slot;

        memcpy(&cmd[1], cbs->bind_cmd_buffer, view_id_size);

        vmw_fifo_commit(ctx->dev_priv, cmd_size);
        bitmap_clear(cbs->per_shader[shader_slot].dirty_sr,
                     cbs->bind_first_slot, cbs->bind_cmd_count);

        return 0;
}

/**
 * vmw_binding_emit_set_rt - Issue delayed DX rendertarget binding commands
 *
 * @cbs: Pointer to the context's struct vmw_ctx_binding_state
 */
static int vmw_emit_set_rt(struct vmw_ctx_binding_state *cbs)
{
        const struct vmw_ctx_bindinfo *loc = &cbs->render_targets[0].bi;
        struct {
                SVGA3dCmdHeader header;
                SVGA3dCmdDXSetRenderTargets body;
        } *cmd;
        size_t cmd_size, view_id_size;
        const struct vmw_resource *ctx = vmw_cbs_context(cbs);

        vmw_collect_view_ids(cbs, loc, SVGA3D_MAX_SIMULTANEOUS_RENDER_TARGETS);
        view_id_size = cbs->bind_cmd_count*sizeof(uint32);
        cmd_size = sizeof(*cmd) + view_id_size;
        cmd = vmw_fifo_reserve_dx(ctx->dev_priv, cmd_size, ctx->id);
        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Failed reserving FIFO space for DX render-target"
                          " binding.\n");
                return -ENOMEM;
        }

        cmd->header.id = SVGA_3D_CMD_DX_SET_RENDERTARGETS;
        cmd->header.size = sizeof(cmd->body) + view_id_size;

        if (cbs->ds_view.bi.ctx && !cbs->ds_view.bi.scrubbed)
                cmd->body.depthStencilViewId = cbs->ds_view.bi.res->id;
        else
                cmd->body.depthStencilViewId = SVGA3D_INVALID_ID;

        memcpy(&cmd[1], cbs->bind_cmd_buffer, view_id_size);

        vmw_fifo_commit(ctx->dev_priv, cmd_size);

        return 0;

}

/**
 * vmw_collect_so_targets - Build SVGA3dSoTarget data for a binding command
 * without checking which bindings actually need to be emitted
 *
 * @cbs: Pointer to the context's struct vmw_ctx_binding_state
 * @bi: Pointer to where the binding info array is stored in @cbs
 * @max_num: Maximum number of entries in the @bi array.
 *
 * Scans the @bi array for bindings and builds a buffer of SVGA3dSoTarget data.
 * Stops at the first non-existing binding in the @bi array.
 * On output, @cbs->bind_cmd_count contains the number of bindings to be
 * emitted, @cbs->bind_first_slot is set to zero, and @cbs->bind_cmd_buffer
 * contains the command data.
 */
static void vmw_collect_so_targets(struct vmw_ctx_binding_state *cbs,
                                   const struct vmw_ctx_bindinfo *bi,
                                   u32 max_num)
{
        const struct vmw_ctx_bindinfo_so *biso =
                container_of(bi, struct vmw_ctx_bindinfo_so, bi);
        unsigned long i;
        SVGA3dSoTarget *so_buffer = (SVGA3dSoTarget *) cbs->bind_cmd_buffer;

        cbs->bind_cmd_count = 0;
        cbs->bind_first_slot = 0;

        for (i = 0; i < max_num; ++i, ++biso, ++so_buffer,
                    ++cbs->bind_cmd_count) {
                if (!biso->bi.ctx)
                        break;

                if (!biso->bi.scrubbed) {
                        so_buffer->sid = biso->bi.res->id;
                        so_buffer->offset = biso->offset;
                        so_buffer->sizeInBytes = biso->size;
                } else {
                        so_buffer->sid = SVGA3D_INVALID_ID;
                        so_buffer->offset = 0;
                        so_buffer->sizeInBytes = 0;
                }
        }
}

/**
 * vmw_binding_emit_set_so - Issue delayed streamout binding commands
 *
 * @cbs: Pointer to the context's struct vmw_ctx_binding_state
 */
static int vmw_emit_set_so(struct vmw_ctx_binding_state *cbs)
{
        const struct vmw_ctx_bindinfo *loc = &cbs->so_targets[0].bi;
        struct {
                SVGA3dCmdHeader header;
                SVGA3dCmdDXSetSOTargets body;
        } *cmd;
        size_t cmd_size, so_target_size;
        const struct vmw_resource *ctx = vmw_cbs_context(cbs);

        vmw_collect_so_targets(cbs, loc, SVGA3D_DX_MAX_SOTARGETS);
        if (cbs->bind_cmd_count == 0)
                return 0;

        so_target_size = cbs->bind_cmd_count*sizeof(SVGA3dSoTarget);
        cmd_size = sizeof(*cmd) + so_target_size;
        cmd = vmw_fifo_reserve_dx(ctx->dev_priv, cmd_size, ctx->id);
        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Failed reserving FIFO space for DX SO target"
                          " binding.\n");
                return -ENOMEM;
        }

        cmd->header.id = SVGA_3D_CMD_DX_SET_SOTARGETS;
        cmd->header.size = sizeof(cmd->body) + so_target_size;
        memcpy(&cmd[1], cbs->bind_cmd_buffer, so_target_size);

        vmw_fifo_commit(ctx->dev_priv, cmd_size);

        return 0;

}

/**
 * vmw_binding_emit_dirty_ps - Issue delayed per shader binding commands
 *
 * @cbs: Pointer to the context's struct vmw_ctx_binding_state
 *
 */
static int vmw_binding_emit_dirty_ps(struct vmw_ctx_binding_state *cbs)
{
        struct vmw_dx_shader_bindings *sb = &cbs->per_shader[0];
        u32 i;
        int ret;

        for (i = 0; i < SVGA3D_NUM_SHADERTYPE_DX10; ++i, ++sb) {
                if (!test_bit(VMW_BINDING_PS_SR_BIT, &sb->dirty))
                        continue;

                ret = vmw_emit_set_sr(cbs, i);
                if (ret)
                        break;

                __clear_bit(VMW_BINDING_PS_SR_BIT, &sb->dirty);
        }

        return 0;
}

/**
 * vmw_collect_dirty_vbs - Build SVGA3dVertexBuffer data for a
 * SVGA3dCmdDXSetVertexBuffers command
 *
 * @cbs: Pointer to the context's struct vmw_ctx_binding_state
 * @bi: Pointer to where the binding info array is stored in @cbs
 * @dirty: Bitmap indicating which bindings need to be emitted.
 * @max_num: Maximum number of entries in the @bi array.
 *
 * Scans the @bi array for bindings that need to be emitted and
 * builds a buffer of SVGA3dVertexBuffer data.
 * On output, @cbs->bind_cmd_count contains the number of bindings to be
 * emitted, @cbs->bind_first_slot indicates the index of the first emitted
 * binding, and @cbs->bind_cmd_buffer contains the command data.
 */
static void vmw_collect_dirty_vbs(struct vmw_ctx_binding_state *cbs,
                                  const struct vmw_ctx_bindinfo *bi,
                                  unsigned long *dirty,
                                  u32 max_num)
{
        const struct vmw_ctx_bindinfo_vb *biv =
                container_of(bi, struct vmw_ctx_bindinfo_vb, bi);
        unsigned long i, next_bit;
        SVGA3dVertexBuffer *vbs = (SVGA3dVertexBuffer *) &cbs->bind_cmd_buffer;

        cbs->bind_cmd_count = 0;
        i = find_first_bit(dirty, max_num);
        next_bit = i;
        cbs->bind_first_slot = i;

        biv += i;
        for (; i < max_num; ++i, ++biv, ++vbs) {
                if (!biv->bi.ctx || biv->bi.scrubbed) {
                        vbs->sid = SVGA3D_INVALID_ID;
                        vbs->stride = 0;
                        vbs->offset = 0;
                } else {
                        vbs->sid = biv->bi.res->id;
                        vbs->stride = biv->stride;
                        vbs->offset = biv->offset;
                }
                cbs->bind_cmd_count++;
                if (next_bit == i) {
                        next_bit = find_next_bit(dirty, max_num, i + 1);
                        if (next_bit >= max_num)
                                break;
                }
        }
}

/**
 * vmw_binding_emit_set_vb - Issue delayed vertex buffer binding commands
 *
 * @cbs: Pointer to the context's struct vmw_ctx_binding_state
 *
 */
static int vmw_emit_set_vb(struct vmw_ctx_binding_state *cbs)
{
        const struct vmw_ctx_bindinfo *loc =
                &cbs->vertex_buffers[0].bi;
        struct {

                SVGA3dCmdHeader header;
                SVGA3dCmdDXSetVertexBuffers body;
        } *cmd;
        size_t cmd_size, set_vb_size;
        const struct vmw_resource *ctx = vmw_cbs_context(cbs);

        vmw_collect_dirty_vbs(cbs, loc, cbs->dirty_vb,
                             SVGA3D_DX_MAX_VERTEXBUFFERS);
        if (cbs->bind_cmd_count == 0)
                return 0;

        set_vb_size = cbs->bind_cmd_count*sizeof(SVGA3dVertexBuffer);
        cmd_size = sizeof(*cmd) + set_vb_size;
        cmd = vmw_fifo_reserve_dx(ctx->dev_priv, cmd_size, ctx->id);
        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Failed reserving FIFO space for DX vertex buffer"
                          " binding.\n");
                return -ENOMEM;
        }

        cmd->header.id = SVGA_3D_CMD_DX_SET_VERTEX_BUFFERS;
        cmd->header.size = sizeof(cmd->body) + set_vb_size;
        cmd->body.startBuffer = cbs->bind_first_slot;

        memcpy(&cmd[1], cbs->bind_cmd_buffer, set_vb_size);

        vmw_fifo_commit(ctx->dev_priv, cmd_size);
        bitmap_clear(cbs->dirty_vb,
                     cbs->bind_first_slot, cbs->bind_cmd_count);

        return 0;
}

/**
 * vmw_binding_emit_dirty - Issue delayed binding commands
 *
 * @cbs: Pointer to the context's struct vmw_ctx_binding_state
 *
 * This function issues the delayed binding commands that arise from
 * previous scrub / unscrub calls. These binding commands are typically
 * commands that batch a number of bindings and therefore it makes sense
 * to delay them.
 */
static int vmw_binding_emit_dirty(struct vmw_ctx_binding_state *cbs)
{
        int ret = 0;
        unsigned long hit = 0;

        while ((hit = find_next_bit(&cbs->dirty, VMW_BINDING_NUM_BITS, hit))
              < VMW_BINDING_NUM_BITS) {

                switch (hit) {
                case VMW_BINDING_RT_BIT:
                        ret = vmw_emit_set_rt(cbs);
                        break;
                case VMW_BINDING_PS_BIT:
                        ret = vmw_binding_emit_dirty_ps(cbs);
                        break;
                case VMW_BINDING_SO_BIT:
                        ret = vmw_emit_set_so(cbs);
                        break;
                case VMW_BINDING_VB_BIT:
                        ret = vmw_emit_set_vb(cbs);
                        break;
                default:
                        BUG();
                }
                if (ret)
                        return ret;

                __clear_bit(hit, &cbs->dirty);
                hit++;
        }

        return 0;
}

/**
 * vmw_binding_scrub_sr - Schedule a dx shaderresource binding
 * scrub from a context
 *
 * @bi: single binding information.
 * @rebind: Whether to issue a bind instead of scrub command.
 */
static int vmw_binding_scrub_sr(struct vmw_ctx_bindinfo *bi, bool rebind)
{
        struct vmw_ctx_bindinfo_view *biv =
                container_of(bi, struct vmw_ctx_bindinfo_view, bi);
        struct vmw_ctx_binding_state *cbs =
                vmw_context_binding_state(bi->ctx);

        __set_bit(biv->slot, cbs->per_shader[biv->shader_slot].dirty_sr);
        __set_bit(VMW_BINDING_PS_SR_BIT,
                  &cbs->per_shader[biv->shader_slot].dirty);
        __set_bit(VMW_BINDING_PS_BIT, &cbs->dirty);

        return 0;
}

/**
 * vmw_binding_scrub_dx_rt - Schedule a dx rendertarget binding
 * scrub from a context
 *
 * @bi: single binding information.
 * @rebind: Whether to issue a bind instead of scrub command.
 */
static int vmw_binding_scrub_dx_rt(struct vmw_ctx_bindinfo *bi, bool rebind)
{
        struct vmw_ctx_binding_state *cbs =
                vmw_context_binding_state(bi->ctx);

        __set_bit(VMW_BINDING_RT_BIT, &cbs->dirty);

        return 0;
}

/**
 * vmw_binding_scrub_so - Schedule a dx streamoutput buffer binding
 * scrub from a context
 *
 * @bi: single binding information.
 * @rebind: Whether to issue a bind instead of scrub command.
 */
static int vmw_binding_scrub_so(struct vmw_ctx_bindinfo *bi, bool rebind)
{
        struct vmw_ctx_binding_state *cbs =
                vmw_context_binding_state(bi->ctx);

        __set_bit(VMW_BINDING_SO_BIT, &cbs->dirty);

        return 0;
}

/**
 * vmw_binding_scrub_vb - Schedule a dx vertex buffer binding
 * scrub from a context
 *
 * @bi: single binding information.
 * @rebind: Whether to issue a bind instead of scrub command.
 */
static int vmw_binding_scrub_vb(struct vmw_ctx_bindinfo *bi, bool rebind)
{
        struct vmw_ctx_bindinfo_vb *bivb =
                container_of(bi, struct vmw_ctx_bindinfo_vb, bi);
        struct vmw_ctx_binding_state *cbs =
                vmw_context_binding_state(bi->ctx);

        __set_bit(bivb->slot, cbs->dirty_vb);
        __set_bit(VMW_BINDING_VB_BIT, &cbs->dirty);

        return 0;
}

/**
 * vmw_binding_scrub_ib - scrub a dx index buffer binding from a context
 *
 * @bi: single binding information.
 * @rebind: Whether to issue a bind instead of scrub command.
 */
static int vmw_binding_scrub_ib(struct vmw_ctx_bindinfo *bi, bool rebind)
{
        struct vmw_ctx_bindinfo_ib *binding =
                container_of(bi, typeof(*binding), bi);
        struct vmw_private *dev_priv = bi->ctx->dev_priv;
        struct {
                SVGA3dCmdHeader header;
                SVGA3dCmdDXSetIndexBuffer body;
        } *cmd;

        cmd = vmw_fifo_reserve_dx(dev_priv, sizeof(*cmd), bi->ctx->id);
        if (unlikely(cmd == NULL)) {
                DRM_ERROR("Failed reserving FIFO space for DX index buffer "
                          "binding.\n");
                return -ENOMEM;
        }
        cmd->header.id = SVGA_3D_CMD_DX_SET_INDEX_BUFFER;
        cmd->header.size = sizeof(cmd->body);
        if (rebind) {
                cmd->body.sid = bi->res->id;
                cmd->body.format = binding->format;
                cmd->body.offset = binding->offset;
        } else {
                cmd->body.sid = SVGA3D_INVALID_ID;
                cmd->body.format = 0;
                cmd->body.offset = 0;
        }

        vmw_fifo_commit(dev_priv, sizeof(*cmd));

        return 0;
}

/**
 * vmw_binding_state_alloc - Allocate a struct vmw_ctx_binding_state with
 * memory accounting.
 *
 * @dev_priv: Pointer to a device private structure.
 *
 * Returns a pointer to a newly allocated struct or an error pointer on error.
 */
struct vmw_ctx_binding_state *
vmw_binding_state_alloc(struct vmw_private *dev_priv)
{
        struct vmw_ctx_binding_state *cbs;
        struct ttm_operation_ctx ctx = {
                .interruptible = false,
                .no_wait_gpu = false
        };
        int ret;

        ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv), sizeof(*cbs),
                                &ctx);
        if (ret)
                return ERR_PTR(ret);

        cbs = vzalloc(sizeof(*cbs));
        if (!cbs) {
                ttm_mem_global_free(vmw_mem_glob(dev_priv), sizeof(*cbs));
                return ERR_PTR(-ENOMEM);
        }

        cbs->dev_priv = dev_priv;
        INIT_LIST_HEAD(&cbs->list);

        return cbs;
}

/**
 * vmw_binding_state_free - Free a struct vmw_ctx_binding_state and its
 * memory accounting info.
 *
 * @cbs: Pointer to the struct vmw_ctx_binding_state to be freed.
 */
void vmw_binding_state_free(struct vmw_ctx_binding_state *cbs)
{
        struct vmw_private *dev_priv = cbs->dev_priv;

        vfree(cbs);
        ttm_mem_global_free(vmw_mem_glob(dev_priv), sizeof(*cbs));
}

/**
 * vmw_binding_state_list - Get the binding list of a
 * struct vmw_ctx_binding_state
 *
 * @cbs: Pointer to the struct vmw_ctx_binding_state
 *
 * Returns the binding list which can be used to traverse through the bindings
 * and access the resource information of all bindings.
 */
struct list_head *vmw_binding_state_list(struct vmw_ctx_binding_state *cbs)
{
        return &cbs->list;
}

/**
 * vmwgfx_binding_state_reset - clear a struct vmw_ctx_binding_state
 *
 * @cbs: Pointer to the struct vmw_ctx_binding_state to be cleared
 *
 * Drops all bindings registered in @cbs. No device binding actions are
 * performed.
 */
void vmw_binding_state_reset(struct vmw_ctx_binding_state *cbs)
{
        struct vmw_ctx_bindinfo *entry, *next;

        list_for_each_entry_safe(entry, next, &cbs->list, ctx_list)
                vmw_binding_drop(entry);
}

/*
 * This function is unused at run-time, and only used to hold various build
 * asserts important for code optimization assumptions.
 */
static void vmw_binding_build_asserts(void)
{
        BUILD_BUG_ON(SVGA3D_NUM_SHADERTYPE_DX10 != 3);
        BUILD_BUG_ON(SVGA3D_MAX_SIMULTANEOUS_RENDER_TARGETS > SVGA3D_RT_MAX);
        BUILD_BUG_ON(sizeof(uint32) != sizeof(u32));

        /*
         * struct vmw_ctx_binding_state::bind_cmd_buffer is used for various
         * view id arrays.
         */
        BUILD_BUG_ON(VMW_MAX_VIEW_BINDINGS < SVGA3D_RT_MAX);
        BUILD_BUG_ON(VMW_MAX_VIEW_BINDINGS < SVGA3D_DX_MAX_SRVIEWS);
        BUILD_BUG_ON(VMW_MAX_VIEW_BINDINGS < SVGA3D_DX_MAX_CONSTBUFFERS);

        /*
         * struct vmw_ctx_binding_state::bind_cmd_buffer is used for
         * u32 view ids, SVGA3dSoTargets and SVGA3dVertexBuffers
         */
        BUILD_BUG_ON(SVGA3D_DX_MAX_SOTARGETS*sizeof(SVGA3dSoTarget) >
                     VMW_MAX_VIEW_BINDINGS*sizeof(u32));
        BUILD_BUG_ON(SVGA3D_DX_MAX_VERTEXBUFFERS*sizeof(SVGA3dVertexBuffer) >
                     VMW_MAX_VIEW_BINDINGS*sizeof(u32));
}