[Mesa-dev] [PATCH 1/2] Add a dumb drm/kms winsys for software rendering

Giovanni Campagna scampa.giovanni at gmail.com
Fri Apr 11 17:25:39 PDT 2014


From: Giovanni Campagna <gcampagna at src.gnome.org>

Add a new winsys and target that can be used with a dri2 state tracker and
loader instead of drisw. This allows to use gbm as a dri2/image loader
and avoid the extra copy from the backbuffer to the shadow frontbuffer.
---
 configure.ac                                      |   4 +-
 src/gallium/targets/Makefile.am                   |   2 +-
 src/gallium/targets/dri-swrast2/Makefile.am       |  72 +++++
 src/gallium/targets/dri-swrast2/swrast2_drm_api.c |  65 +++++
 src/gallium/winsys/Makefile.am                    |   2 +-
 src/gallium/winsys/sw/kms-dri/Makefile.am         |  33 +++
 src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.c | 310 ++++++++++++++++++++++
 src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.h |  37 +++
 8 files changed, 522 insertions(+), 3 deletions(-)
 create mode 100644 src/gallium/targets/dri-swrast2/Makefile.am
 create mode 100644 src/gallium/targets/dri-swrast2/swrast2_drm_api.c
 create mode 100644 src/gallium/winsys/sw/kms-dri/Makefile.am
 create mode 100644 src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.c
 create mode 100644 src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.h

diff --git a/configure.ac b/configure.ac
index c71fa26..7179abd 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1857,7 +1857,7 @@ if test -n "$with_gallium_drivers"; then
             fi
 
             if test "x$enable_dri" = xyes; then
-                GALLIUM_TARGET_DIRS="$GALLIUM_TARGET_DIRS dri-swrast"
+                GALLIUM_TARGET_DIRS="$GALLIUM_TARGET_DIRS dri-swrast dri-swrast2"
             fi
             ;;
         *)
@@ -2073,6 +2073,7 @@ AC_CONFIG_FILES([Makefile
 		src/gallium/targets/dri-ilo/Makefile
 		src/gallium/targets/dri-nouveau/Makefile
 		src/gallium/targets/dri-swrast/Makefile
+		src/gallium/targets/dri-swrast2/Makefile
 		src/gallium/targets/dri-vmwgfx/Makefile
 		src/gallium/targets/egl-static/Makefile
 		src/gallium/targets/gbm/Makefile
@@ -2103,6 +2104,7 @@ AC_CONFIG_FILES([Makefile
 		src/gallium/winsys/nouveau/drm/Makefile
 		src/gallium/winsys/radeon/drm/Makefile
 		src/gallium/winsys/svga/drm/Makefile
+		src/gallium/winsys/sw/kms-dri/Makefile
 		src/gallium/winsys/sw/dri/Makefile
 		src/gallium/winsys/sw/fbdev/Makefile
 		src/gallium/winsys/sw/null/Makefile
diff --git a/src/gallium/targets/Makefile.am b/src/gallium/targets/Makefile.am
index 871b31d..475962b 100644
--- a/src/gallium/targets/Makefile.am
+++ b/src/gallium/targets/Makefile.am
@@ -120,7 +120,7 @@ endif
 
 if HAVE_GALLIUM_SOFTPIPE
 if HAVE_DRI
-SUBDIRS += dri-swrast
+SUBDIRS += dri-swrast dri-swrast2
 endif
 endif
 
diff --git a/src/gallium/targets/dri-swrast2/Makefile.am b/src/gallium/targets/dri-swrast2/Makefile.am
new file mode 100644
index 0000000..d22ec82
--- /dev/null
+++ b/src/gallium/targets/dri-swrast2/Makefile.am
@@ -0,0 +1,72 @@
+# Copyright © 2012 Intel Corporation
+#
+# 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, sublicense,
+# 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
+# NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+# HOLDERS 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 $(top_srcdir)/src/gallium/Automake.inc
+
+AM_CFLAGS = \
+	$(GALLIUM_CFLAGS) \
+	$(PTHREAD_CFLAGS) \
+	$(LIBDRM_CFLAGS)
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/gallium/winsys/sw/kms-dri \
+	-I$(top_srcdir)/src/gallium/drivers \
+	-I$(top_srcdir)/src/gallium/winsys \
+	-I$(top_srcdir)/src/mesa \
+	-I$(top_srcdir)/src/mapi \
+	-DGALLIUM_RBUG \
+	-DGALLIUM_TRACE \
+	-DGALLIUM_SOFTPIPE
+
+dridir = $(DRI_DRIVER_INSTALL_DIR)
+dri_LTLIBRARIES = swrast_dri2_dri.la
+
+swrast_dri2_dri_la_SOURCES = \
+	swrast2_drm_api.c \
+	$(top_srcdir)/src/mesa/drivers/dri/common/utils.c \
+	$(top_srcdir)/src/mesa/drivers/dri/common/dri_util.c \
+	$(top_srcdir)/src/mesa/drivers/dri/common/xmlconfig.c
+
+swrast_dri2_dri_la_LDFLAGS = -module -avoid-version -shared -no-undefined
+
+swrast_dri2_dri_la_LIBADD = \
+	$(top_builddir)/src/mesa/libmesagallium.la \
+	$(top_builddir)/src/gallium/auxiliary/libgallium.la \
+	$(top_builddir)/src/gallium/state_trackers/dri/drm/libdridrm.la \
+	$(top_builddir)/src/gallium/winsys/sw/kms-dri/libswkmsdri.la \
+	$(top_builddir)/src/gallium/drivers/softpipe/libsoftpipe.la \
+	$(top_builddir)/src/gallium/drivers/trace/libtrace.la \
+	$(top_builddir)/src/gallium/drivers/rbug/librbug.la \
+	$(GALLIUM_DRI_LIB_DEPS)
+
+nodist_EXTRA_swrast_dri2_dri_la_SOURCES = dummy.cpp
+
+if HAVE_MESA_LLVM
+AM_CPPFLAGS += -DGALLIUM_LLVMPIPE
+swrast_dri2_dri_la_LDFLAGS += $(LLVM_LDFLAGS)
+swrast_dri2_dri_la_LIBADD += $(top_builddir)/src/gallium/drivers/llvmpipe/libllvmpipe.la $(LLVM_LIBS)
+endif
+
+# Provide compatibility with scripts for the old Mesa build system for
+# a while by putting a link to the driver into /lib of the build tree.
+all-local: swrast_dri2_dri.la
+	$(MKDIR_P) $(top_builddir)/$(LIB_DIR)/gallium
+	ln -f .libs/swrast_dri2_dri.so $(top_builddir)/$(LIB_DIR)/gallium/swrast_dri2_dri.so
diff --git a/src/gallium/targets/dri-swrast2/swrast2_drm_api.c b/src/gallium/targets/dri-swrast2/swrast2_drm_api.c
new file mode 100644
index 0000000..10f891b
--- /dev/null
+++ b/src/gallium/targets/dri-swrast2/swrast2_drm_api.c
@@ -0,0 +1,65 @@
+/**************************************************************************
+ *
+ * Copyright 2009, VMware, Inc.
+ * All Rights Reserved.
+ * Copyright 2010 George Sapountzis <gsapountzis at gmail.com>
+ *
+ * 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 VMWARE 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 "pipe/p_compiler.h"
+#include "util/u_memory.h"
+#include "kms_dri_sw_winsys.h"
+
+#include "target-helpers/inline_debug_helper.h"
+#include "target-helpers/inline_sw_helper.h"
+
+#include "state_tracker/drm_driver.h"
+
+static struct pipe_screen *
+drisw_create_dri2_screen(int fd)
+{
+   struct sw_winsys *winsys = NULL;
+   struct pipe_screen *screen = NULL;
+
+   winsys = kms_dri_create_winsys(fd);
+   if (winsys == NULL)
+      return NULL;
+
+   screen = sw_screen_create(winsys);
+   if (!screen)
+      goto fail;
+
+   screen = debug_screen_wrap(screen);
+
+   return screen;
+
+fail:
+   if (winsys)
+      winsys->destroy(winsys);
+
+   return NULL;
+}
+
+DRM_DRIVER_DESCRIPTOR("swrast", NULL, drisw_create_dri2_screen, NULL);
+
+/* vim: set sw=3 ts=8 sts=3 expandtab: */
diff --git a/src/gallium/winsys/Makefile.am b/src/gallium/winsys/Makefile.am
index ab1acc3..d2f50b3 100644
--- a/src/gallium/winsys/Makefile.am
+++ b/src/gallium/winsys/Makefile.am
@@ -27,7 +27,7 @@ SUBDIRS += sw/xlib
 endif
 
 if HAVE_DRI
-SUBDIRS += sw/dri
+SUBDIRS += sw/dri sw/kms-dri
 endif
 
 if HAVE_EGL_PLATFORM_FBDEV
diff --git a/src/gallium/winsys/sw/kms-dri/Makefile.am b/src/gallium/winsys/sw/kms-dri/Makefile.am
new file mode 100644
index 0000000..320e9dc
--- /dev/null
+++ b/src/gallium/winsys/sw/kms-dri/Makefile.am
@@ -0,0 +1,33 @@
+# Copyright © 2012 Intel Corporation
+#             2013 Red Hat, Inc.
+#
+# 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, sublicense,
+# 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
+# NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+# HOLDERS 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 $(top_srcdir)/src/gallium/Automake.inc
+
+AM_CPPFLAGS = \
+	$(GALLIUM_CFLAGS) \
+        $(LIBDRM_CFLAGS)
+
+noinst_LTLIBRARIES = libswkmsdri.la
+
+libswkmsdri_la_SOURCES = kms_dri_sw_winsys.c
+libswkmsdri_la_LIBADD = $(LIBDRM_LIBS)
diff --git a/src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.c b/src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.c
new file mode 100644
index 0000000..745b857
--- /dev/null
+++ b/src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.c
@@ -0,0 +1,310 @@
+/**************************************************************************
+ *
+ * Copyright 2009, VMware, Inc.
+ * All Rights Reserved.
+ * Copyright 2010 George Sapountzis <gsapountzis at gmail.com>
+ *           2013 Red Hat, Inc.
+ *
+ * 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 VMWARE 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 <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <limits.h>
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <unistd.h>
+#include <dlfcn.h>
+#include <xf86drm.h>
+
+#include "pipe/p_compiler.h"
+#include "pipe/p_format.h"
+#include "util/u_inlines.h"
+#include "util/u_format.h"
+#include "util/u_math.h"
+#include "util/u_memory.h"
+#include "util/u_double_list.h"
+
+#include "state_tracker/sw_winsys.h"
+#include "state_tracker/drm_driver.h"
+
+#if 0
+#define DEBUG(msg, ...) fprintf(stderr, msg, __VA_ARGS__)
+#else
+#define DEBUG(msg, ...)
+#endif
+
+struct sw_winsys;
+
+struct sw_winsys *kms_dri_create_winsys(int fd);
+
+struct kms_sw_displaytarget
+{
+   enum pipe_format format;
+   unsigned width;
+   unsigned height;
+   unsigned stride;
+   unsigned size;
+
+   uint32_t handle;
+   void *mapped;
+
+   int ref_count;
+   struct list_head link;
+};
+
+struct kms_sw_winsys
+{
+   struct sw_winsys base;
+
+   int fd;
+   struct list_head bo_list;
+};
+
+static INLINE struct kms_sw_displaytarget *
+kms_sw_displaytarget( struct sw_displaytarget *dt )
+{
+   return (struct kms_sw_displaytarget *)dt;
+}
+
+static INLINE struct kms_sw_winsys *
+kms_sw_winsys( struct sw_winsys *ws )
+{
+   return (struct kms_sw_winsys *)ws;
+}
+
+
+static boolean
+kms_sw_is_displaytarget_format_supported( struct sw_winsys *ws,
+                                          unsigned tex_usage,
+                                          enum pipe_format format )
+{
+   /* TODO: check visuals or other sensible thing here */
+   return TRUE;
+}
+
+static struct sw_displaytarget *
+kms_sw_displaytarget_create(struct sw_winsys *ws,
+                            unsigned tex_usage,
+                            enum pipe_format format,
+                            unsigned width, unsigned height,
+                            unsigned alignment,
+                            unsigned *stride)
+{
+   struct kms_sw_winsys *kms_sw = kms_sw_winsys(ws);
+   struct kms_sw_displaytarget *kms_sw_dt;
+   struct drm_mode_create_dumb create_req;
+   struct drm_mode_destroy_dumb destroy_req;
+   int ret;
+
+   kms_sw_dt = CALLOC_STRUCT(kms_sw_displaytarget);
+   if(!kms_sw_dt)
+      goto no_dt;
+
+   kms_sw_dt->ref_count = 1;
+
+   kms_sw_dt->format = format;
+   kms_sw_dt->width = width;
+   kms_sw_dt->height = height;
+
+   create_req.bpp = 32;
+   create_req.width = width;
+   create_req.height = height;
+   ret = drmIoctl(kms_sw->fd, DRM_IOCTL_MODE_CREATE_DUMB, &create_req);
+   if (ret)
+      goto free_bo;
+
+   kms_sw_dt->stride = create_req.pitch;
+   kms_sw_dt->size = create_req.size;
+   kms_sw_dt->handle = create_req.handle;
+
+   list_add(&kms_sw_dt->link, &kms_sw->bo_list);
+
+   DEBUG("KMS-DEBUG: created buffer %u (size %u)\n", kms_sw_dt->handle, kms_sw_dt->size);
+
+   *stride = kms_sw_dt->stride;
+   return (struct sw_displaytarget *)kms_sw_dt;
+
+ free_bo:
+   memset(&destroy_req, 0, sizeof destroy_req);
+   destroy_req.handle = create_req.handle;
+   drmIoctl(kms_sw->fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy_req);
+   FREE(kms_sw_dt);
+ no_dt:
+   return NULL;
+}
+
+static void
+kms_sw_displaytarget_destroy(struct sw_winsys *ws,
+                             struct sw_displaytarget *dt)
+{
+   struct kms_sw_winsys *kms_sw = kms_sw_winsys(ws);
+   struct kms_sw_displaytarget *kms_sw_dt = kms_sw_displaytarget(dt);
+   struct drm_mode_destroy_dumb destroy_req;
+
+   kms_sw_dt->ref_count --;
+   if (kms_sw_dt->ref_count > 0)
+      return;
+
+   memset(&destroy_req, 0, sizeof destroy_req);
+   destroy_req.handle = kms_sw_dt->handle;
+   drmIoctl(kms_sw->fd, DRM_IOCTL_MODE_DESTROY_DUMB, &destroy_req);
+
+   list_del(&kms_sw_dt->link);
+
+   DEBUG("KMS-DEBUG: destroyed buffer %u\n", kms_sw_dt->handle);
+
+   FREE(kms_sw_dt);
+}
+
+static void *
+kms_sw_displaytarget_map(struct sw_winsys *ws,
+                         struct sw_displaytarget *dt,
+                         unsigned flags)
+{
+   struct kms_sw_winsys *kms_sw = kms_sw_winsys(ws);
+   struct kms_sw_displaytarget *kms_sw_dt = kms_sw_displaytarget(dt);
+   struct drm_mode_map_dumb map_req;
+   int ret;
+
+   memset(&map_req, 0, sizeof map_req);
+   map_req.handle = kms_sw_dt->handle;
+   ret = drmIoctl(kms_sw->fd, DRM_IOCTL_MODE_MAP_DUMB, &map_req);
+   if (ret)
+      return NULL;
+
+   if (flags == PIPE_TRANSFER_READ)
+      kms_sw_dt->mapped = mmap(0, kms_sw_dt->size, PROT_READ, MAP_SHARED,
+                               kms_sw->fd, map_req.offset);
+   else
+      kms_sw_dt->mapped = mmap(0, kms_sw_dt->size, PROT_READ | PROT_WRITE, MAP_SHARED,
+                               kms_sw->fd, map_req.offset);
+
+   DEBUG("KMS-DEBUG: mapped buffer %u (size %u) at %p\n",
+         kms_sw_dt->handle, kms_sw_dt->size, kms_sw_dt->mapped);
+
+   return kms_sw_dt->mapped;
+}
+
+static void
+kms_sw_displaytarget_unmap(struct sw_winsys *ws,
+                           struct sw_displaytarget *dt)
+{
+   struct kms_sw_displaytarget *kms_sw_dt = kms_sw_displaytarget(dt);
+
+   DEBUG("KMS-DEBUG: unmapped buffer %u (was %p)\n", kms_sw_dt->handle, kms_sw_dt->mapped);
+
+   munmap(kms_sw_dt->mapped, kms_sw_dt->size);
+   kms_sw_dt->mapped = NULL;
+}
+
+static struct sw_displaytarget *
+kms_sw_displaytarget_from_handle(struct sw_winsys *ws,
+                                 const struct pipe_resource *templ,
+                                 struct winsys_handle *whandle,
+                                 unsigned *stride)
+{
+   struct kms_sw_winsys *kms_sw = kms_sw_winsys(ws);
+   struct kms_sw_displaytarget *kms_sw_dt;
+
+   LIST_FOR_EACH_ENTRY(kms_sw_dt, &kms_sw->bo_list, link) {
+      if (kms_sw_dt->handle == whandle->handle) {
+         kms_sw_dt->ref_count++;
+
+         DEBUG("KMS-DEBUG: imported buffer %u (size %u)\n", kms_sw_dt->handle, kms_sw_dt->size);
+
+         *stride = kms_sw_dt->stride;
+         return (struct sw_displaytarget *)kms_sw_dt;
+      }
+   }
+
+   assert(0);
+   return NULL;
+}
+
+static boolean
+kms_sw_displaytarget_get_handle(struct sw_winsys *winsys,
+                                struct sw_displaytarget *dt,
+                                struct winsys_handle *whandle)
+{
+   struct kms_sw_displaytarget *kms_sw_dt = kms_sw_displaytarget(dt);
+
+   assert(whandle->type == DRM_API_HANDLE_TYPE_SHARED);
+   whandle->handle = kms_sw_dt->handle;
+   whandle->stride = kms_sw_dt->stride;
+   return TRUE;
+}
+
+static void
+kms_sw_displaytarget_display(struct sw_winsys *ws,
+                             struct sw_displaytarget *dt,
+                             void *context_private)
+{
+   /* This function should not be called, instead the dri2 loader should
+      handle swap buffers internally.
+   */
+   assert(0);
+}
+
+
+static void
+kms_destroy_sw_winsys(struct sw_winsys *winsys)
+{
+   FREE(winsys);
+}
+
+struct sw_winsys *
+kms_dri_create_winsys(int fd)
+{
+   struct kms_sw_winsys *ws;
+
+   ws = CALLOC_STRUCT(kms_sw_winsys);
+   if (!ws)
+      return NULL;
+
+   ws->fd = fd;
+   list_inithead(&ws->bo_list);
+
+   ws->base.destroy = kms_destroy_sw_winsys;
+
+   ws->base.is_displaytarget_format_supported = kms_sw_is_displaytarget_format_supported;
+
+   /* screen texture functions */
+   ws->base.displaytarget_create = kms_sw_displaytarget_create;
+   ws->base.displaytarget_destroy = kms_sw_displaytarget_destroy;
+   ws->base.displaytarget_from_handle = kms_sw_displaytarget_from_handle;
+   ws->base.displaytarget_get_handle = kms_sw_displaytarget_get_handle;
+
+   /* texture functions */
+   ws->base.displaytarget_map = kms_sw_displaytarget_map;
+   ws->base.displaytarget_unmap = kms_sw_displaytarget_unmap;
+
+   ws->base.displaytarget_display = kms_sw_displaytarget_display;
+
+   return &ws->base;
+}
+
+/* vim: set sw=3 ts=8 sts=3 expandtab: */
diff --git a/src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.h b/src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.h
new file mode 100644
index 0000000..e276a72
--- /dev/null
+++ b/src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.h
@@ -0,0 +1,37 @@
+/**************************************************************************
+ *
+ * Copyright 2009, VMware, Inc.
+ * All Rights Reserved.
+ * Copyright 2010 George Sapountzis <gsapountzis at gmail.com>
+ *           2013 Red Hat, Inc.
+ *
+ * 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 VMWARE 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.
+ *
+ **************************************************************************/
+
+#ifndef KMS_DRI_SW_WINSYS
+#define KMS_DRI_SW_WINSYS
+
+struct sw_winsys;
+
+struct sw_winsys *kms_dri_create_winsys(int fd);
+
+#endif
-- 
1.9.0



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