1 files changed, 812 insertions, 0 deletions

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c b/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
new file mode 100644
index 000000000000..ee3856578a12
--- /dev/null
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_shader.c
@@ -0,0 +1,812 @@
+/**************************************************************************
+ *
+ * Copyright © 2009-2012 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_resource_priv.h"
+#include "ttm/ttm_placement.h"
+
+#define VMW_COMPAT_SHADER_HT_ORDER 12
+
+struct vmw_shader {
+        struct vmw_resource res;
+        SVGA3dShaderType type;
+        uint32_t size;
+};
+
+struct vmw_user_shader {
+        struct ttm_base_object base;
+        struct vmw_shader shader;
+};
+
+/**
+ * enum vmw_compat_shader_state - Staging state for compat shaders
+ */
+enum vmw_compat_shader_state {
+        VMW_COMPAT_COMMITED,
+        VMW_COMPAT_ADD,
+        VMW_COMPAT_DEL
+};
+
+/**
+ * struct vmw_compat_shader - Metadata for compat shaders.
+ *
+ * @handle: The TTM handle of the guest backed shader.
+ * @tfile: The struct ttm_object_file the guest backed shader is registered
+ * with.
+ * @hash: Hash item for lookup.
+ * @head: List head for staging lists or the compat shader manager list.
+ * @state: Staging state.
+ *
+ * The structure is protected by the cmdbuf lock.
+ */
+struct vmw_compat_shader {
+        u32 handle;
+        struct ttm_object_file *tfile;
+        struct drm_hash_item hash;
+        struct list_head head;
+        enum vmw_compat_shader_state state;
+};
+
+/**
+ * struct vmw_compat_shader_manager - Compat shader manager.
+ *
+ * @shaders: Hash table containing staged and commited compat shaders
+ * @list: List of commited shaders.
+ * @dev_priv: Pointer to a device private structure.
+ *
+ * @shaders and @list are protected by the cmdbuf mutex for now.
+ */
+struct vmw_compat_shader_manager {
+        struct drm_open_hash shaders;
+        struct list_head list;
+        struct vmw_private *dev_priv;
+};
+
+static void vmw_user_shader_free(struct vmw_resource *res);
+static struct vmw_resource *
+vmw_user_shader_base_to_res(struct ttm_base_object *base);
+
+static int vmw_gb_shader_create(struct vmw_resource *res);
+static int vmw_gb_shader_bind(struct vmw_resource *res,
+                               struct ttm_validate_buffer *val_buf);
+static int vmw_gb_shader_unbind(struct vmw_resource *res,
+                                 bool readback,
+                                 struct ttm_validate_buffer *val_buf);
+static int vmw_gb_shader_destroy(struct vmw_resource *res);
+
+static uint64_t vmw_user_shader_size;
+
+static const struct vmw_user_resource_conv user_shader_conv = {
+        .object_type = VMW_RES_SHADER,
+        .base_obj_to_res = vmw_user_shader_base_to_res,
+        .res_free = vmw_user_shader_free
+};
+
+const struct vmw_user_resource_conv *user_shader_converter =
+        &user_shader_conv;
+
+
+static const struct vmw_res_func vmw_gb_shader_func = {
+        .res_type = vmw_res_shader,
+        .needs_backup = true,
+        .may_evict = true,
+        .type_name = "guest backed shaders",
+        .backup_placement = &vmw_mob_placement,
+        .create = vmw_gb_shader_create,
+        .destroy = vmw_gb_shader_destroy,
+        .bind = vmw_gb_shader_bind,
+        .unbind = vmw_gb_shader_unbind
+};
+
+/**
+ * Shader management:
+ */
+
+static inline struct vmw_shader *
+vmw_res_to_shader(struct vmw_resource *res)
+{
+        return container_of(res, struct vmw_shader, res);
+}
+
+static void vmw_hw_shader_destroy(struct vmw_resource *res)
+{
+        (void) vmw_gb_shader_destroy(res);
+}
+
+static int vmw_gb_shader_init(struct vmw_private *dev_priv,
+                              struct vmw_resource *res,
+                              uint32_t size,
+                              uint64_t offset,
+                              SVGA3dShaderType type,
+                              struct vmw_dma_buffer *byte_code,
+                              void (*res_free) (struct vmw_resource *res))
+{
+        struct vmw_shader *shader = vmw_res_to_shader(res);
+        int ret;
+
+        ret = vmw_resource_init(dev_priv, res, true,
+                                res_free, &vmw_gb_shader_func);
+
+
+        if (unlikely(ret != 0)) {
+                if (res_free)
+                        res_free(res);
+                else
+                        kfree(res);
+                return ret;
+        }
+
+        res->backup_size = size;
+        if (byte_code) {
+                res->backup = vmw_dmabuf_reference(byte_code);
+                res->backup_offset = offset;
+        }
+        shader->size = size;
+        shader->type = type;
+
+        vmw_resource_activate(res, vmw_hw_shader_destroy);
+        return 0;
+}
+
+static int vmw_gb_shader_create(struct vmw_resource *res)
+{
+        struct vmw_private *dev_priv = res->dev_priv;
+        struct vmw_shader *shader = vmw_res_to_shader(res);
+        int ret;
+        struct {
+                SVGA3dCmdHeader header;
+                SVGA3dCmdDefineGBShader body;
+        } *cmd;
+
+        if (likely(res->id != -1))
+                return 0;
+
+        ret = vmw_resource_alloc_id(res);
+        if (unlikely(ret != 0)) {
+                DRM_ERROR("Failed to allocate a shader id.\n");
+                goto out_no_id;
+        }
+
+        if (unlikely(res->id >= VMWGFX_NUM_GB_SHADER)) {
+                ret = -EBUSY;
+                goto out_no_fifo;
+        }
+
+        cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
+        if (unlikely(cmd == NULL)) {
+                DRM_ERROR("Failed reserving FIFO space for shader "
+                          "creation.\n");
+                ret = -ENOMEM;
+                goto out_no_fifo;
+        }
+
+        cmd->header.id = SVGA_3D_CMD_DEFINE_GB_SHADER;
+        cmd->header.size = sizeof(cmd->body);
+        cmd->body.shid = res->id;
+        cmd->body.type = shader->type;
+        cmd->body.sizeInBytes = shader->size;
+        vmw_fifo_commit(dev_priv, sizeof(*cmd));
+        (void) vmw_3d_resource_inc(dev_priv, false);
+
+        return 0;
+
+out_no_fifo:
+        vmw_resource_release_id(res);
+out_no_id:
+        return ret;
+}
+
+static int vmw_gb_shader_bind(struct vmw_resource *res,
+                              struct ttm_validate_buffer *val_buf)
+{
+        struct vmw_private *dev_priv = res->dev_priv;
+        struct {
+                SVGA3dCmdHeader header;
+                SVGA3dCmdBindGBShader body;
+        } *cmd;
+        struct ttm_buffer_object *bo = val_buf->bo;
+
+        BUG_ON(bo->mem.mem_type != VMW_PL_MOB);
+
+        cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
+        if (unlikely(cmd == NULL)) {
+                DRM_ERROR("Failed reserving FIFO space for shader "
+                          "binding.\n");
+                return -ENOMEM;
+        }
+
+        cmd->header.id = SVGA_3D_CMD_BIND_GB_SHADER;
+        cmd->header.size = sizeof(cmd->body);
+        cmd->body.shid = res->id;
+        cmd->body.mobid = bo->mem.start;
+        cmd->body.offsetInBytes = 0;
+        res->backup_dirty = false;
+        vmw_fifo_commit(dev_priv, sizeof(*cmd));
+
+        return 0;
+}
+
+static int vmw_gb_shader_unbind(struct vmw_resource *res,
+                                bool readback,
+                                struct ttm_validate_buffer *val_buf)
+{
+        struct vmw_private *dev_priv = res->dev_priv;
+        struct {
+                SVGA3dCmdHeader header;
+                SVGA3dCmdBindGBShader body;
+        } *cmd;
+        struct vmw_fence_obj *fence;
+
+        BUG_ON(res->backup->base.mem.mem_type != VMW_PL_MOB);
+
+        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_BIND_GB_SHADER;
+        cmd->header.size = sizeof(cmd->body);
+        cmd->body.shid = res->id;
+        cmd->body.mobid = SVGA3D_INVALID_ID;
+        cmd->body.offsetInBytes = 0;
+        vmw_fifo_commit(dev_priv, sizeof(*cmd));
+
+        /*
+         * Create a fence object and fence the backup buffer.
+         */
+
+        (void) vmw_execbuf_fence_commands(NULL, dev_priv,
+                                          &fence, NULL);
+
+        vmw_fence_single_bo(val_buf->bo, fence);
+
+        if (likely(fence != NULL))
+                vmw_fence_obj_unreference(&fence);
+
+        return 0;
+}
+
+static int vmw_gb_shader_destroy(struct vmw_resource *res)
+{
+        struct vmw_private *dev_priv = res->dev_priv;
+        struct {
+                SVGA3dCmdHeader header;
+                SVGA3dCmdDestroyGBShader body;
+        } *cmd;
+
+        if (likely(res->id == -1))
+                return 0;
+
+        mutex_lock(&dev_priv->binding_mutex);
+        vmw_context_binding_res_list_scrub(&res->binding_head);
+
+        cmd = vmw_fifo_reserve(dev_priv, sizeof(*cmd));
+        if (unlikely(cmd == NULL)) {
+                DRM_ERROR("Failed reserving FIFO space for shader "
+                          "destruction.\n");
+                mutex_unlock(&dev_priv->binding_mutex);
+                return -ENOMEM;
+        }
+
+        cmd->header.id = SVGA_3D_CMD_DESTROY_GB_SHADER;
+        cmd->header.size = sizeof(cmd->body);
+        cmd->body.shid = res->id;
+        vmw_fifo_commit(dev_priv, sizeof(*cmd));
+        mutex_unlock(&dev_priv->binding_mutex);
+        vmw_resource_release_id(res);
+        vmw_3d_resource_dec(dev_priv, false);
+
+        return 0;
+}
+
+/**
+ * User-space shader management:
+ */
+
+static struct vmw_resource *
+vmw_user_shader_base_to_res(struct ttm_base_object *base)
+{
+        return &(container_of(base, struct vmw_user_shader, base)->
+                 shader.res);
+}
+
+static void vmw_user_shader_free(struct vmw_resource *res)
+{
+        struct vmw_user_shader *ushader =
+                container_of(res, struct vmw_user_shader, shader.res);
+        struct vmw_private *dev_priv = res->dev_priv;
+
+        ttm_base_object_kfree(ushader, base);
+        ttm_mem_global_free(vmw_mem_glob(dev_priv),
+                            vmw_user_shader_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_shader_base_release(struct ttm_base_object **p_base)
+{
+        struct ttm_base_object *base = *p_base;
+        struct vmw_resource *res = vmw_user_shader_base_to_res(base);
+
+        *p_base = NULL;
+        vmw_resource_unreference(&res);
+}
+
+int vmw_shader_destroy_ioctl(struct drm_device *dev, void *data,
+                              struct drm_file *file_priv)
+{
+        struct drm_vmw_shader_arg *arg = (struct drm_vmw_shader_arg *)data;
+        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
+
+        return ttm_ref_object_base_unref(tfile, arg->handle,
+                                         TTM_REF_USAGE);
+}
+
+static int vmw_shader_alloc(struct vmw_private *dev_priv,
+                            struct vmw_dma_buffer *buffer,
+                            size_t shader_size,
+                            size_t offset,
+                            SVGA3dShaderType shader_type,
+                            struct ttm_object_file *tfile,
+                            u32 *handle)
+{
+        struct vmw_user_shader *ushader;
+        struct vmw_resource *res, *tmp;
+        int ret;
+
+        /*
+         * Approximate idr memory usage with 128 bytes. It will be limited
+         * by maximum number_of shaders anyway.
+         */
+        if (unlikely(vmw_user_shader_size == 0))
+                vmw_user_shader_size =
+                        ttm_round_pot(sizeof(struct vmw_user_shader)) + 128;
+
+        ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
+                                   vmw_user_shader_size,
+                                   false, true);
+        if (unlikely(ret != 0)) {
+                if (ret != -ERESTARTSYS)
+                        DRM_ERROR("Out of graphics memory for shader "
+                                  "creation.\n");
+                goto out;
+        }
+
+        ushader = kzalloc(sizeof(*ushader), GFP_KERNEL);
+        if (unlikely(ushader == NULL)) {
+                ttm_mem_global_free(vmw_mem_glob(dev_priv),
+                                    vmw_user_shader_size);
+                ret = -ENOMEM;
+                goto out;
+        }
+
+        res = &ushader->shader.res;
+        ushader->base.shareable = false;
+        ushader->base.tfile = NULL;
+
+        /*
+         * From here on, the destructor takes over resource freeing.
+         */
+
+        ret = vmw_gb_shader_init(dev_priv, res, shader_size,
+                                 offset, shader_type, buffer,
+                                 vmw_user_shader_free);
+        if (unlikely(ret != 0))
+                goto out;
+
+        tmp = vmw_resource_reference(res);
+        ret = ttm_base_object_init(tfile, &ushader->base, false,
+                                   VMW_RES_SHADER,
+                                   &vmw_user_shader_base_release, NULL);
+
+        if (unlikely(ret != 0)) {
+                vmw_resource_unreference(&tmp);
+                goto out_err;
+        }
+
+        if (handle)
+                *handle = ushader->base.hash.key;
+out_err:
+        vmw_resource_unreference(&res);
+out:
+        return ret;
+}
+
+
+int vmw_shader_define_ioctl(struct drm_device *dev, void *data,
+                             struct drm_file *file_priv)
+{
+        struct vmw_private *dev_priv = vmw_priv(dev);
+        struct drm_vmw_shader_create_arg *arg =
+                (struct drm_vmw_shader_create_arg *)data;
+        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
+        struct vmw_master *vmaster = vmw_master(file_priv->master);
+        struct vmw_dma_buffer *buffer = NULL;
+        SVGA3dShaderType shader_type;
+        int ret;
+
+        if (arg->buffer_handle != SVGA3D_INVALID_ID) {
+                ret = vmw_user_dmabuf_lookup(tfile, arg->buffer_handle,
+                                             &buffer);
+                if (unlikely(ret != 0)) {
+                        DRM_ERROR("Could not find buffer for shader "
+                                  "creation.\n");
+                        return ret;
+                }
+
+                if ((u64)buffer->base.num_pages * PAGE_SIZE <
+                    (u64)arg->size + (u64)arg->offset) {
+                        DRM_ERROR("Illegal buffer- or shader size.\n");
+                        ret = -EINVAL;
+                        goto out_bad_arg;
+                }
+        }
+
+        switch (arg->shader_type) {
+        case drm_vmw_shader_type_vs:
+                shader_type = SVGA3D_SHADERTYPE_VS;
+                break;
+        case drm_vmw_shader_type_ps:
+                shader_type = SVGA3D_SHADERTYPE_PS;
+                break;
+        case drm_vmw_shader_type_gs:
+                shader_type = SVGA3D_SHADERTYPE_GS;
+                break;
+        default:
+                DRM_ERROR("Illegal shader type.\n");
+                ret = -EINVAL;
+                goto out_bad_arg;
+        }
+
+        ret = ttm_read_lock(&vmaster->lock, true);
+        if (unlikely(ret != 0))
+                goto out_bad_arg;
+
+        ret = vmw_shader_alloc(dev_priv, buffer, arg->size, arg->offset,
+                               shader_type, tfile, &arg->shader_handle);
+
+        ttm_read_unlock(&vmaster->lock);
+out_bad_arg:
+        vmw_dmabuf_unreference(&buffer);
+        return ret;
+}
+
+/**
+ * vmw_compat_shader_lookup - Look up a compat shader
+ *
+ * @man: Pointer to the compat shader manager.
+ * @shader_type: The shader type, that combined with the user_key identifies
+ * the shader.
+ * @user_key: On entry, this should be a pointer to the user_key.
+ * On successful exit, it will contain the guest-backed shader's TTM handle.
+ *
+ * Returns 0 on success. Non-zero on failure, in which case the value pointed
+ * to by @user_key is unmodified.
+ */
+int vmw_compat_shader_lookup(struct vmw_compat_shader_manager *man,
+                             SVGA3dShaderType shader_type,
+                             u32 *user_key)
+{
+        struct drm_hash_item *hash;
+        int ret;
+        unsigned long key = *user_key | (shader_type << 24);
+
+        ret = drm_ht_find_item(&man->shaders, key, &hash);
+        if (unlikely(ret != 0))
+                return ret;
+
+        *user_key = drm_hash_entry(hash, struct vmw_compat_shader,
+                                   hash)->handle;
+
+        return 0;
+}
+
+/**
+ * vmw_compat_shader_free - Free a compat shader.
+ *
+ * @man: Pointer to the compat shader manager.
+ * @entry: Pointer to a struct vmw_compat_shader.
+ *
+ * Frees a struct vmw_compat_shder entry and drops its reference to the
+ * guest backed shader.
+ */
+static void vmw_compat_shader_free(struct vmw_compat_shader_manager *man,
+                                   struct vmw_compat_shader *entry)
+{
+        list_del(&entry->head);
+        WARN_ON(drm_ht_remove_item(&man->shaders, &entry->hash));
+        WARN_ON(ttm_ref_object_base_unref(entry->tfile, entry->handle,
+                                          TTM_REF_USAGE));
+        kfree(entry);
+}
+
+/**
+ * vmw_compat_shaders_commit - Commit a list of compat shader actions.
+ *
+ * @man: Pointer to the compat shader manager.
+ * @list: Caller's list of compat shader actions.
+ *
+ * This function commits a list of compat shader additions or removals.
+ * It is typically called when the execbuf ioctl call triggering these
+ * actions has commited the fifo contents to the device.
+ */
+void vmw_compat_shaders_commit(struct vmw_compat_shader_manager *man,
+                               struct list_head *list)
+{
+        struct vmw_compat_shader *entry, *next;
+
+        list_for_each_entry_safe(entry, next, list, head) {
+                list_del(&entry->head);
+                switch (entry->state) {
+                case VMW_COMPAT_ADD:
+                        entry->state = VMW_COMPAT_COMMITED;
+                        list_add_tail(&entry->head, &man->list);
+                        break;
+                case VMW_COMPAT_DEL:
+                        ttm_ref_object_base_unref(entry->tfile, entry->handle,
+                                                  TTM_REF_USAGE);
+                        kfree(entry);
+                        break;
+                default:
+                        BUG();
+                        break;
+                }
+        }
+}
+
+/**
+ * vmw_compat_shaders_revert - Revert a list of compat shader actions
+ *
+ * @man: Pointer to the compat shader manager.
+ * @list: Caller's list of compat shader actions.
+ *
+ * This function reverts a list of compat shader additions or removals.
+ * It is typically called when the execbuf ioctl call triggering these
+ * actions failed for some reason, and the command stream was never
+ * submitted.
+ */
+void vmw_compat_shaders_revert(struct vmw_compat_shader_manager *man,
+                               struct list_head *list)
+{
+        struct vmw_compat_shader *entry, *next;
+        int ret;
+
+        list_for_each_entry_safe(entry, next, list, head) {
+                switch (entry->state) {
+                case VMW_COMPAT_ADD:
+                        vmw_compat_shader_free(man, entry);
+                        break;
+                case VMW_COMPAT_DEL:
+                        ret = drm_ht_insert_item(&man->shaders, &entry->hash);
+                        list_del(&entry->head);
+                        list_add_tail(&entry->head, &man->list);
+                        entry->state = VMW_COMPAT_COMMITED;
+                        break;
+                default:
+                        BUG();
+                        break;
+                }
+        }
+}
+
+/**
+ * vmw_compat_shader_remove - Stage a compat shader for removal.
+ *
+ * @man: Pointer to the compat shader manager
+ * @user_key: The key that is used to identify the shader. The key is
+ * unique to the shader type.
+ * @shader_type: Shader type.
+ * @list: Caller's list of staged shader actions.
+ *
+ * This function stages a compat shader for removal and removes the key from
+ * the shader manager's hash table. If the shader was previously only staged
+ * for addition it is completely removed (But the execbuf code may keep a
+ * reference if it was bound to a context between addition and removal). If
+ * it was previously commited to the manager, it is staged for removal.
+ */
+int vmw_compat_shader_remove(struct vmw_compat_shader_manager *man,
+                             u32 user_key, SVGA3dShaderType shader_type,
+                             struct list_head *list)
+{
+        struct vmw_compat_shader *entry;
+        struct drm_hash_item *hash;
+        int ret;
+
+        ret = drm_ht_find_item(&man->shaders, user_key | (shader_type << 24),
+                               &hash);
+        if (likely(ret != 0))
+                return -EINVAL;
+
+        entry = drm_hash_entry(hash, struct vmw_compat_shader, hash);
+
+        switch (entry->state) {
+        case VMW_COMPAT_ADD:
+                vmw_compat_shader_free(man, entry);
+                break;
+        case VMW_COMPAT_COMMITED:
+                (void) drm_ht_remove_item(&man->shaders, &entry->hash);
+                list_del(&entry->head);
+                entry->state = VMW_COMPAT_DEL;
+                list_add_tail(&entry->head, list);
+                break;
+        default:
+                BUG();
+                break;
+        }
+
+        return 0;
+}
+
+/**
+ * vmw_compat_shader_add - Create a compat shader and add the
+ * key to the manager
+ *
+ * @man: Pointer to the compat shader manager
+ * @user_key: The key that is used to identify the shader. The key is
+ * unique to the shader type.
+ * @bytecode: Pointer to the bytecode of the shader.
+ * @shader_type: Shader type.
+ * @tfile: Pointer to a struct ttm_object_file that the guest-backed shader is
+ * to be created with.
+ * @list: Caller's list of staged shader actions.
+ *
+ * Note that only the key is added to the shader manager's hash table.
+ * The shader is not yet added to the shader manager's list of shaders.
+ */
+int vmw_compat_shader_add(struct vmw_compat_shader_manager *man,
+                          u32 user_key, const void *bytecode,
+                          SVGA3dShaderType shader_type,
+                          size_t size,
+                          struct ttm_object_file *tfile,
+                          struct list_head *list)
+{
+        struct vmw_dma_buffer *buf;
+        struct ttm_bo_kmap_obj map;
+        bool is_iomem;
+        struct vmw_compat_shader *compat;
+        u32 handle;
+        int ret;
+
+        if (user_key > ((1 << 24) - 1) || (unsigned) shader_type > 16)
+                return -EINVAL;
+
+        /* Allocate and pin a DMA buffer */
+        buf = kzalloc(sizeof(*buf), GFP_KERNEL);
+        if (unlikely(buf == NULL))
+                return -ENOMEM;
+
+        ret = vmw_dmabuf_init(man->dev_priv, buf, size, &vmw_sys_ne_placement,
+                              true, vmw_dmabuf_bo_free);
+        if (unlikely(ret != 0))
+                goto out;
+
+        ret = ttm_bo_reserve(&buf->base, false, true, false, NULL);
+        if (unlikely(ret != 0))
+                goto no_reserve;
+
+        /* Map and copy shader bytecode. */
+        ret = ttm_bo_kmap(&buf->base, 0, PAGE_ALIGN(size) >> PAGE_SHIFT,
+                          &map);
+        if (unlikely(ret != 0)) {
+                ttm_bo_unreserve(&buf->base);
+                goto no_reserve;
+        }
+
+        memcpy(ttm_kmap_obj_virtual(&map, &is_iomem), bytecode, size);
+        WARN_ON(is_iomem);
+
+        ttm_bo_kunmap(&map);
+        ret = ttm_bo_validate(&buf->base, &vmw_sys_placement, false, true);
+        WARN_ON(ret != 0);
+        ttm_bo_unreserve(&buf->base);
+
+        /* Create a guest-backed shader container backed by the dma buffer */
+        ret = vmw_shader_alloc(man->dev_priv, buf, size, 0, shader_type,
+                               tfile, &handle);
+        vmw_dmabuf_unreference(&buf);
+        if (unlikely(ret != 0))
+                goto no_reserve;
+        /*
+         * Create a compat shader structure and stage it for insertion
+         * in the manager
+         */
+        compat = kzalloc(sizeof(*compat), GFP_KERNEL);
+        if (compat == NULL)
+                goto no_compat;
+
+        compat->hash.key = user_key |  (shader_type << 24);
+        ret = drm_ht_insert_item(&man->shaders, &compat->hash);
+        if (unlikely(ret != 0))
+                goto out_invalid_key;
+
+        compat->state = VMW_COMPAT_ADD;
+        compat->handle = handle;
+        compat->tfile = tfile;
+        list_add_tail(&compat->head, list);
+
+        return 0;
+
+out_invalid_key:
+        kfree(compat);
+no_compat:
+        ttm_ref_object_base_unref(tfile, handle, TTM_REF_USAGE);
+no_reserve:
+out:
+        return ret;
+}
+
+/**
+ * vmw_compat_shader_man_create - Create a compat shader manager
+ *
+ * @dev_priv: Pointer to a device private structure.
+ *
+ * Typically done at file open time. If successful returns a pointer to a
+ * compat shader manager. Otherwise returns an error pointer.
+ */
+struct vmw_compat_shader_manager *
+vmw_compat_shader_man_create(struct vmw_private *dev_priv)
+{
+        struct vmw_compat_shader_manager *man;
+        int ret;
+
+        man = kzalloc(sizeof(*man), GFP_KERNEL);
+        if (man == NULL)
+                return ERR_PTR(-ENOMEM);
+
+        man->dev_priv = dev_priv;
+        INIT_LIST_HEAD(&man->list);
+        ret = drm_ht_create(&man->shaders, VMW_COMPAT_SHADER_HT_ORDER);
+        if (ret == 0)
+                return man;
+
+        kfree(man);
+        return ERR_PTR(ret);
+}
+
+/**
+ * vmw_compat_shader_man_destroy - Destroy a compat shader manager
+ *
+ * @man: Pointer to the shader manager to destroy.
+ *
+ * Typically done at file close time.
+ */
+void vmw_compat_shader_man_destroy(struct vmw_compat_shader_manager *man)
+{
+        struct vmw_compat_shader *entry, *next;
+
+        mutex_lock(&man->dev_priv->cmdbuf_mutex);
+        list_for_each_entry_safe(entry, next, &man->list, head)
+                vmw_compat_shader_free(man, entry);
+
+        mutex_unlock(&man->dev_priv->cmdbuf_mutex);
+        kfree(man);
+}