drm/vmwgfx: Emulate legacy shaders on guest-backed devices v2
authorThomas Hellstrom <thellstrom@vmware.com>
Fri, 31 Jan 2014 09:12:10 +0000 (10:12 +0100)
committerThomas Hellstrom <thellstrom@vmware.com>
Wed, 5 Feb 2014 07:39:19 +0000 (08:39 +0100)
Command stream legacy shader creation and destruction is replaced by
NOPs in the command stream, and instead guest-backed shaders are created
and destroyed as part of the command validation process.

v2: Removed some stray debug messages.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Jakob Bornecrantz <jakob@vmware.com>
drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
drivers/gpu/drm/vmwgfx/vmwgfx_execbuf.c
drivers/gpu/drm/vmwgfx/vmwgfx_shader.c

index 9893328f8fdc04750ec78538c4cdb2ba89ddae30..3bdc0adc656d002a22e1b95b28c4ba6f3a7d7747 100644 (file)
@@ -941,6 +941,7 @@ static void vmw_postclose(struct drm_device *dev,
                drm_master_put(&vmw_fp->locked_master);
        }
 
+       vmw_compat_shader_man_destroy(vmw_fp->shman);
        ttm_object_file_release(&vmw_fp->tfile);
        kfree(vmw_fp);
 }
@@ -960,11 +961,17 @@ static int vmw_driver_open(struct drm_device *dev, struct drm_file *file_priv)
        if (unlikely(vmw_fp->tfile == NULL))
                goto out_no_tfile;
 
+       vmw_fp->shman = vmw_compat_shader_man_create(dev_priv);
+       if (IS_ERR(vmw_fp->shman))
+               goto out_no_shman;
+
        file_priv->driver_priv = vmw_fp;
        dev_priv->bdev.dev_mapping = dev->dev_mapping;
 
        return 0;
 
+out_no_shman:
+       ttm_object_file_release(&vmw_fp->tfile);
 out_no_tfile:
        kfree(vmw_fp);
        return ret;
index 554e7fa330824cc7a2f1d728f4299c19c8ab8fb5..cef0ff7ac738305da4d59ec6c26c7cd2cc112a7d 100644 (file)
 #define VMW_RES_FENCE ttm_driver_type3
 #define VMW_RES_SHADER ttm_driver_type4
 
+struct vmw_compat_shader_manager;
+
 struct vmw_fpriv {
        struct drm_master *locked_master;
        struct ttm_object_file *tfile;
        struct list_head fence_events;
+       bool gb_aware;
+       struct vmw_compat_shader_manager *shman;
 };
 
 struct vmw_dma_buffer {
@@ -318,7 +322,7 @@ struct vmw_sw_context{
        struct drm_open_hash res_ht;
        bool res_ht_initialized;
        bool kernel; /**< is the called made from the kernel */
-       struct ttm_object_file *tfile;
+       struct vmw_fpriv *fp;
        struct list_head validate_nodes;
        struct vmw_relocation relocs[VMWGFX_MAX_RELOCATIONS];
        uint32_t cur_reloc;
@@ -336,6 +340,7 @@ struct vmw_sw_context{
        bool needs_post_query_barrier;
        struct vmw_resource *error_resource;
        struct vmw_ctx_binding_state staged_bindings;
+       struct list_head staged_shaders;
 };
 
 struct vmw_legacy_display;
@@ -991,6 +996,28 @@ extern int vmw_shader_define_ioctl(struct drm_device *dev, void *data,
                                   struct drm_file *file_priv);
 extern int vmw_shader_destroy_ioctl(struct drm_device *dev, void *data,
                                    struct drm_file *file_priv);
+extern int vmw_compat_shader_lookup(struct vmw_compat_shader_manager *man,
+                                   SVGA3dShaderType shader_type,
+                                   u32 *user_key);
+extern void vmw_compat_shaders_commit(struct vmw_compat_shader_manager *man,
+                                     struct list_head *list);
+extern void vmw_compat_shaders_revert(struct vmw_compat_shader_manager *man,
+                                     struct list_head *list);
+extern int vmw_compat_shader_remove(struct vmw_compat_shader_manager *man,
+                                   u32 user_key,
+                                   SVGA3dShaderType shader_type,
+                                   struct list_head *list);
+extern 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);
+extern struct vmw_compat_shader_manager *
+vmw_compat_shader_man_create(struct vmw_private *dev_priv);
+extern void
+vmw_compat_shader_man_destroy(struct vmw_compat_shader_manager *man);
+
 
 /**
  * Inline helper functions
index 9441825c7860a22f5cad1d74ad1e07fe8940734e..352224b9d667593994854702ecd593a0d1f94265 100644 (file)
@@ -235,8 +235,12 @@ static void vmw_resource_relocations_apply(uint32_t *cb,
 {
        struct vmw_resource_relocation *rel;
 
-       list_for_each_entry(rel, list, head)
-               cb[rel->offset] = rel->res->id;
+       list_for_each_entry(rel, list, head) {
+               if (likely(rel->res != NULL))
+                       cb[rel->offset] = rel->res->id;
+               else
+                       cb[rel->offset] = SVGA_3D_CMD_NOP;
+       }
 }
 
 static int vmw_cmd_invalid(struct vmw_private *dev_priv,
@@ -381,22 +385,27 @@ static int vmw_resources_validate(struct vmw_sw_context *sw_context)
 }
 
 /**
- * vmw_cmd_res_check - Check that a resource is present and if so, put it
+ * vmw_cmd_compat_res_check - Check that a resource is present and if so, put it
  * on the resource validate list unless it's already there.
  *
  * @dev_priv: Pointer to a device private structure.
  * @sw_context: Pointer to the software context.
  * @res_type: Resource type.
  * @converter: User-space visisble type specific information.
- * @id: Pointer to the location in the command buffer currently being
+ * @id: user-space resource id handle.
+ * @id_loc: Pointer to the location in the command buffer currently being
  * parsed from where the user-space resource id handle is located.
+ * @p_val: Pointer to pointer to resource validalidation node. Populated
+ * on exit.
  */
-static int vmw_cmd_res_check(struct vmw_private *dev_priv,
-                            struct vmw_sw_context *sw_context,
-                            enum vmw_res_type res_type,
-                            const struct vmw_user_resource_conv *converter,
-                            uint32_t *id,
-                            struct vmw_resource_val_node **p_val)
+static int
+vmw_cmd_compat_res_check(struct vmw_private *dev_priv,
+                        struct vmw_sw_context *sw_context,
+                        enum vmw_res_type res_type,
+                        const struct vmw_user_resource_conv *converter,
+                        uint32_t id,
+                        uint32_t *id_loc,
+                        struct vmw_resource_val_node **p_val)
 {
        struct vmw_res_cache_entry *rcache =
                &sw_context->res_cache[res_type];
@@ -404,7 +413,7 @@ static int vmw_cmd_res_check(struct vmw_private *dev_priv,
        struct vmw_resource_val_node *node;
        int ret;
 
-       if (*id == SVGA3D_INVALID_ID) {
+       if (id == SVGA3D_INVALID_ID) {
                if (p_val)
                        *p_val = NULL;
                if (res_type == vmw_res_context) {
@@ -419,7 +428,7 @@ static int vmw_cmd_res_check(struct vmw_private *dev_priv,
         * resource
         */
 
-       if (likely(rcache->valid && *id == rcache->handle)) {
+       if (likely(rcache->valid && id == rcache->handle)) {
                const struct vmw_resource *res = rcache->res;
 
                rcache->node->first_usage = false;
@@ -428,28 +437,28 @@ static int vmw_cmd_res_check(struct vmw_private *dev_priv,
 
                return vmw_resource_relocation_add
                        (&sw_context->res_relocations, res,
-                        id - sw_context->buf_start);
+                        id_loc - sw_context->buf_start);
        }
 
        ret = vmw_user_resource_lookup_handle(dev_priv,
-                                             sw_context->tfile,
-                                             *id,
+                                             sw_context->fp->tfile,
+                                             id,
                                              converter,
                                              &res);
        if (unlikely(ret != 0)) {
                DRM_ERROR("Could not find or use resource 0x%08x.\n",
-                         (unsigned) *id);
+                         (unsigned) id);
                dump_stack();
                return ret;
        }
 
        rcache->valid = true;
        rcache->res = res;
-       rcache->handle = *id;
+       rcache->handle = id;
 
        ret = vmw_resource_relocation_add(&sw_context->res_relocations,
                                          res,
-                                         id - sw_context->buf_start);
+                                         id_loc - sw_context->buf_start);
        if (unlikely(ret != 0))
                goto out_no_reloc;
 
@@ -482,6 +491,31 @@ out_no_reloc:
        return ret;
 }
 
+/**
+ * vmw_cmd_res_check - Check that a resource is present and if so, put it
+ * on the resource validate list unless it's already there.
+ *
+ * @dev_priv: Pointer to a device private structure.
+ * @sw_context: Pointer to the software context.
+ * @res_type: Resource type.
+ * @converter: User-space visisble type specific information.
+ * @id_loc: Pointer to the location in the command buffer currently being
+ * parsed from where the user-space resource id handle is located.
+ * @p_val: Pointer to pointer to resource validalidation node. Populated
+ * on exit.
+ */
+static int
+vmw_cmd_res_check(struct vmw_private *dev_priv,
+                 struct vmw_sw_context *sw_context,
+                 enum vmw_res_type res_type,
+                 const struct vmw_user_resource_conv *converter,
+                 uint32_t *id_loc,
+                 struct vmw_resource_val_node **p_val)
+{
+       return vmw_cmd_compat_res_check(dev_priv, sw_context, res_type,
+                                       converter, *id_loc, id_loc, p_val);
+}
+
 /**
  * vmw_cmd_cid_check - Check a command header for valid context information.
  *
@@ -769,7 +803,7 @@ static int vmw_translate_mob_ptr(struct vmw_private *dev_priv,
        struct vmw_relocation *reloc;
        int ret;
 
-       ret = vmw_user_dmabuf_lookup(sw_context->tfile, handle, &vmw_bo);
+       ret = vmw_user_dmabuf_lookup(sw_context->fp->tfile, handle, &vmw_bo);
        if (unlikely(ret != 0)) {
                DRM_ERROR("Could not find or use MOB buffer.\n");
                return -EINVAL;
@@ -830,7 +864,7 @@ static int vmw_translate_guest_ptr(struct vmw_private *dev_priv,
        struct vmw_relocation *reloc;
        int ret;
 
-       ret = vmw_user_dmabuf_lookup(sw_context->tfile, handle, &vmw_bo);
+       ret = vmw_user_dmabuf_lookup(sw_context->fp->tfile, handle, &vmw_bo);
        if (unlikely(ret != 0)) {
                DRM_ERROR("Could not find or use GMR region.\n");
                return -EINVAL;
@@ -1129,7 +1163,8 @@ static int vmw_cmd_dma(struct vmw_private *dev_priv,
 
        srf = vmw_res_to_srf(sw_context->res_cache[vmw_res_surface].res);
 
-       vmw_kms_cursor_snoop(srf, sw_context->tfile, &vmw_bo->base, header);
+       vmw_kms_cursor_snoop(srf, sw_context->fp->tfile, &vmw_bo->base,
+                            header);
 
 out_no_surface:
        vmw_dmabuf_unreference(&vmw_bo);
@@ -1480,6 +1515,98 @@ static int vmw_cmd_invalidate_gb_surface(struct vmw_private *dev_priv,
                                 &cmd->body.sid, NULL);
 }
 
+
+/**
+ * vmw_cmd_shader_define - Validate an SVGA_3D_CMD_SHADER_DEFINE
+ * command
+ *
+ * @dev_priv: Pointer to a device private struct.
+ * @sw_context: The software context being used for this batch.
+ * @header: Pointer to the command header in the command stream.
+ */
+static int vmw_cmd_shader_define(struct vmw_private *dev_priv,
+                                struct vmw_sw_context *sw_context,
+                                SVGA3dCmdHeader *header)
+{
+       struct vmw_shader_define_cmd {
+               SVGA3dCmdHeader header;
+               SVGA3dCmdDefineShader body;
+       } *cmd;
+       int ret;
+       size_t size;
+
+       cmd = container_of(header, struct vmw_shader_define_cmd,
+                          header);
+
+       ret = vmw_cmd_res_check(dev_priv, sw_context, vmw_res_context,
+                               user_context_converter, &cmd->body.cid,
+                               NULL);
+       if (unlikely(ret != 0))
+               return ret;
+
+       if (unlikely(!dev_priv->has_mob))
+               return 0;
+
+       size = cmd->header.size - sizeof(cmd->body);
+       ret = vmw_compat_shader_add(sw_context->fp->shman,
+                                   cmd->body.shid, cmd + 1,
+                                   cmd->body.type, size,
+                                   sw_context->fp->tfile,
+                                   &sw_context->staged_shaders);
+       if (unlikely(ret != 0))
+               return ret;
+
+       return vmw_resource_relocation_add(&sw_context->res_relocations,
+                                          NULL, &cmd->header.id -
+                                          sw_context->buf_start);
+
+       return 0;
+}
+
+/**
+ * vmw_cmd_shader_destroy - Validate an SVGA_3D_CMD_SHADER_DESTROY
+ * command
+ *
+ * @dev_priv: Pointer to a device private struct.
+ * @sw_context: The software context being used for this batch.
+ * @header: Pointer to the command header in the command stream.
+ */
+static int vmw_cmd_shader_destroy(struct vmw_private *dev_priv,
+                                 struct vmw_sw_context *sw_context,
+                                 SVGA3dCmdHeader *header)
+{
+       struct vmw_shader_destroy_cmd {
+               SVGA3dCmdHeader header;
+               SVGA3dCmdDestroyShader body;
+       } *cmd;
+       int ret;
+
+       cmd = container_of(header, struct vmw_shader_destroy_cmd,
+                          header);
+
+       ret = vmw_cmd_res_check(dev_priv, sw_context, vmw_res_context,
+                               user_context_converter, &cmd->body.cid,
+                               NULL);
+       if (unlikely(ret != 0))
+               return ret;
+
+       if (unlikely(!dev_priv->has_mob))
+               return 0;
+
+       ret = vmw_compat_shader_remove(sw_context->fp->shman,
+                                      cmd->body.shid,
+                                      cmd->body.type,
+                                      &sw_context->staged_shaders);
+       if (unlikely(ret != 0))
+               return ret;
+
+       return vmw_resource_relocation_add(&sw_context->res_relocations,
+                                          NULL, &cmd->header.id -
+                                          sw_context->buf_start);
+
+       return 0;
+}
+
 /**
  * vmw_cmd_set_shader - Validate an SVGA_3D_CMD_SET_SHADER
  * command
@@ -1511,10 +1638,17 @@ static int vmw_cmd_set_shader(struct vmw_private *dev_priv,
        if (dev_priv->has_mob) {
                struct vmw_ctx_bindinfo bi;
                struct vmw_resource_val_node *res_node;
+               u32 shid = cmd->body.shid;
+
+               (void) vmw_compat_shader_lookup(sw_context->fp->shman,
+                                               cmd->body.type,
+                                               &shid);
 
-               ret = vmw_cmd_res_check(dev_priv, sw_context, vmw_res_shader,
-                                       user_shader_converter,
-                                       &cmd->body.shid, &res_node);
+               ret = vmw_cmd_compat_res_check(dev_priv, sw_context,
+                                              vmw_res_shader,
+                                              user_shader_converter,
+                                              shid,
+                                              &cmd->body.shid, &res_node);
                if (unlikely(ret != 0))
                        return ret;
 
@@ -1669,10 +1803,10 @@ static const struct vmw_cmd_entry const vmw_cmd_entries[SVGA_3D_CMD_MAX] = {
                    true, false, false),
        VMW_CMD_DEF(SVGA_3D_CMD_PRESENT, &vmw_cmd_present_check,
                    false, false, false),
-       VMW_CMD_DEF(SVGA_3D_CMD_SHADER_DEFINE, &vmw_cmd_cid_check,
-                   true, true, false),
-       VMW_CMD_DEF(SVGA_3D_CMD_SHADER_DESTROY, &vmw_cmd_cid_check,
-                   true, true, false),
+       VMW_CMD_DEF(SVGA_3D_CMD_SHADER_DEFINE, &vmw_cmd_shader_define,
+                   true, false, false),
+       VMW_CMD_DEF(SVGA_3D_CMD_SHADER_DESTROY, &vmw_cmd_shader_destroy,
+                   true, false, false),
        VMW_CMD_DEF(SVGA_3D_CMD_SET_SHADER, &vmw_cmd_set_shader,
                    true, false, false),
        VMW_CMD_DEF(SVGA_3D_CMD_SET_SHADER_CONST, &vmw_cmd_set_shader_const,
@@ -2206,7 +2340,7 @@ int vmw_execbuf_process(struct drm_file *file_priv,
        } else
                sw_context->kernel = true;
 
-       sw_context->tfile = vmw_fpriv(file_priv)->tfile;
+       sw_context->fp = vmw_fpriv(file_priv);
        sw_context->cur_reloc = 0;
        sw_context->cur_val_buf = 0;
        sw_context->fence_flags = 0;
@@ -2223,6 +2357,7 @@ int vmw_execbuf_process(struct drm_file *file_priv,
                        goto out_unlock;
                sw_context->res_ht_initialized = true;
        }
+       INIT_LIST_HEAD(&sw_context->staged_shaders);
 
        INIT_LIST_HEAD(&resource_list);
        ret = vmw_cmd_check_all(dev_priv, sw_context, kernel_commands,
@@ -2311,6 +2446,8 @@ int vmw_execbuf_process(struct drm_file *file_priv,
        }
 
        list_splice_init(&sw_context->resource_list, &resource_list);
+       vmw_compat_shaders_commit(sw_context->fp->shman,
+                                 &sw_context->staged_shaders);
        mutex_unlock(&dev_priv->cmdbuf_mutex);
 
        /*
@@ -2337,6 +2474,8 @@ out_unlock:
        list_splice_init(&sw_context->resource_list, &resource_list);
        error_resource = sw_context->error_resource;
        sw_context->error_resource = NULL;
+       vmw_compat_shaders_revert(sw_context->fp->shman,
+                                 &sw_context->staged_shaders);
        mutex_unlock(&dev_priv->cmdbuf_mutex);
 
        /*
index 1457ec4b7125471d99aeac6da26009ee5009bc6a..be85d7fdfb5b135d7b0b151c3a5a1f6f1e55dda4 100644 (file)
@@ -29,6 +29,8 @@
 #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;
@@ -40,6 +42,50 @@ struct vmw_user_shader {
        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);
@@ -325,13 +371,81 @@ int vmw_shader_destroy_ioctl(struct drm_device *dev, void *data,
                                         TTM_REF_USAGE);
 }
 
+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 vmw_user_shader *ushader;
-       struct vmw_resource *res;
-       struct vmw_resource *tmp;
        struct drm_vmw_shader_create_arg *arg =
                (struct drm_vmw_shader_create_arg *)data;
        struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
@@ -373,69 +487,324 @@ int vmw_shader_define_ioctl(struct drm_device *dev, void *data,
                goto out_bad_arg;
        }
 
-       /*
-        * Approximate idr memory usage with 128 bytes. It will be limited
-        * by maximum number_of shaders anyway.
-        */
+       ret = ttm_read_lock(&vmaster->lock, true);
+       if (unlikely(ret != 0))
+               goto out_bad_arg;
 
-       if (unlikely(vmw_user_shader_size == 0))
-               vmw_user_shader_size = ttm_round_pot(sizeof(*ushader))
-                       + 128;
+       ret = vmw_shader_alloc(dev_priv, buffer, arg->size, arg->offset,
+                              shader_type, tfile, &arg->shader_handle);
 
-       ret = ttm_read_lock(&vmaster->lock, true);
+       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;
 
-       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_unlock;
+       *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;
+               }
        }
+}
 
-       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_unlock;
+/**
+ * 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;
+               }
        }
+}
 
-       res = &ushader->shader.res;
-       ushader->base.shareable = false;
-       ushader->base.tfile = NULL;
+/**
+ * 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;
 
-       /*
-        * From here on, the destructor takes over resource freeing.
-        */
+       ret = drm_ht_find_item(&man->shaders, user_key | (shader_type << 24),
+                              &hash);
+       if (likely(ret != 0))
+               return -EINVAL;
 
-       ret = vmw_gb_shader_init(dev_priv, res, arg->size,
-                                arg->offset, shader_type, buffer,
-                                vmw_user_shader_free);
+       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_unlock;
+               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);
+       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)) {
-               vmw_resource_unreference(&tmp);
-               goto out_err;
+               ttm_bo_unreserve(&buf->base);
+               goto no_reserve;
        }
 
-       arg->shader_handle = ushader->base.hash.key;
-out_err:
-       vmw_resource_unreference(&res);
-out_unlock:
-       ttm_read_unlock(&vmaster->lock);
-out_bad_arg:
-       vmw_dmabuf_unreference(&buffer);
+       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);
+
+       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);
 }