[Mesa-dev] [PATCH 2/3] Add a dumb drm/kms winsys for software rendering
Emil Velikov
emil.l.velikov at gmail.com
Fri Jul 11 10:19:16 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.
The new driver is called "kms_swrast", and is only loaded by gbm
as a fallback, because it is only useful with the gbm platform
(as no buffer sharing is possible)
v2: [Emil Velikov]
- Rebase on top of gallium megadriver.
- s/text/test/ in configure.ac (Spotted by Andreas Pokorny).
- Add scons support for winsys/sw/kms-dri and fix the build.
Signed-off-by: Emil Velikov <emil.l.velikov at gmail.com>
---
configure.ac | 5 +
docs/relnotes/10.3.html | 2 +
src/gallium/SConscript | 4 +
.../auxiliary/target-helpers/inline_drm_helper.h | 45 ++-
src/gallium/targets/dri/Makefile.am | 6 +
src/gallium/targets/dri/SConscript | 4 +
src/gallium/winsys/Makefile.am | 4 +
src/gallium/winsys/sw/kms-dri/Makefile.am | 32 +++
src/gallium/winsys/sw/kms-dri/SConscript | 26 ++
src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.c | 312 +++++++++++++++++++++
src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.h | 37 +++
11 files changed, 475 insertions(+), 2 deletions(-)
create mode 100644 src/gallium/winsys/sw/kms-dri/Makefile.am
create mode 100644 src/gallium/winsys/sw/kms-dri/SConscript
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 48f5f81..dc5be3f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1987,6 +1987,10 @@ if test -n "$with_gallium_drivers"; then
if test "x$enable_dri" = xyes; then
GALLIUM_TARGET_DIRS="$GALLIUM_TARGET_DIRS dri/swrast"
fi
+
+ if test "x$have_libdrm" = xyes; then
+ GALLIUM_TARGET_DIRS="$GALLIUM_TARGET_DIRS dri/kms-swrast"
+ fi
;;
*)
AC_MSG_ERROR([Unknown Gallium driver: $driver])
@@ -2223,6 +2227,7 @@ AC_CONFIG_FILES([Makefile
src/gallium/winsys/svga/drm/Makefile
src/gallium/winsys/sw/dri/Makefile
src/gallium/winsys/sw/fbdev/Makefile
+ src/gallium/winsys/sw/kms-dri/Makefile
src/gallium/winsys/sw/null/Makefile
src/gallium/winsys/sw/wayland/Makefile
src/gallium/winsys/sw/wrapper/Makefile
diff --git a/docs/relnotes/10.3.html b/docs/relnotes/10.3.html
index 2e718fc..b14466a 100644
--- a/docs/relnotes/10.3.html
+++ b/docs/relnotes/10.3.html
@@ -56,6 +56,8 @@ Note: some of the new features are only available with certain drivers.
<li>GL_ARB_seamless_cubemap_per_texture on i965, llvmpipe, nvc0, r600, radeonsi, softpipe</li>
<li>GL_ARB_fragment_layer_viewport on nv50, nvc0, llvmpipe, r600</li>
<li>GL_AMD_vertex_shader_viewport_index on i965/gen7+, r600</li>
+<li>A new software rasterizer driver (kms_swrast_dri.so) that works with
+DRM drivers that don't have a full-fledged GEM (such as qxl or simpledrm)</li>
</ul>
diff --git a/src/gallium/SConscript b/src/gallium/SConscript
index 8d9849e..cb61720 100644
--- a/src/gallium/SConscript
+++ b/src/gallium/SConscript
@@ -71,6 +71,10 @@ if env['dri']:
])
SConscript([
+ 'winsys/sw/kms-dri/SConscript',
+ ])
+
+ SConscript([
'winsys/svga/drm/SConscript',
])
diff --git a/src/gallium/auxiliary/target-helpers/inline_drm_helper.h b/src/gallium/auxiliary/target-helpers/inline_drm_helper.h
index bdd8669..5b15f28 100644
--- a/src/gallium/auxiliary/target-helpers/inline_drm_helper.h
+++ b/src/gallium/auxiliary/target-helpers/inline_drm_helper.h
@@ -8,6 +8,11 @@
#include "dri_screen.h"
#endif
+#if GALLIUM_SOFTPIPE
+#include "target-helpers/inline_sw_helper.h"
+#include "sw/kms-dri/kms_dri_sw_winsys.h"
+#endif
+
#if GALLIUM_I915
#include "i915/drm/i915_drm_public.h"
#include "i915/i915_public.h"
@@ -53,6 +58,33 @@ static char* driver_name = NULL;
/* XXX: We need to teardown the winsys if *screen_create() fails. */
+#if GALLIUM_SOFTPIPE
+#if defined(DRI_TARGET)
+
+const __DRIextension **__driDriverGetExtensions_kms_swrast(void);
+
+PUBLIC const __DRIextension **__driDriverGetExtensions_kms_swrast(void)
+{
+ globalDriverAPI = &galliumdrm_driver_api;
+ return galliumdrm_driver_extensions;
+}
+
+static struct pipe_screen *
+pipe_kms_swrast_create_screen(int fd)
+{
+ struct sw_winsys *sws;
+ struct pipe_screen *screen;
+
+ sws = kms_dri_create_winsys(fd);
+ if (!sws)
+ return NULL;
+
+ screen = sw_screen_create(sws);
+ return screen ? debug_screen_wrap(screen) : NULL;
+}
+#endif
+#endif
+
#if defined(GALLIUM_I915)
#if defined(DRI_TARGET)
@@ -247,9 +279,18 @@ pipe_freedreno_create_screen(int fd)
inline struct pipe_screen *
dd_create_screen(int fd)
{
+ struct pipe_screen *screen = NULL;
+
driver_name = loader_get_driver_for_fd(fd, _LOADER_GALLIUM);
- if (!driver_name)
- return NULL;
+ if (!driver_name) {
+#if GALLIUM_SOFTPIPE
+#if defined(DRI_TARGET)
+ /* Failed to find (no?) driver for this fd. Fallback to kms-swrast. */
+ screen = pipe_kms_swrast_create_screen(fd);
+#endif
+#endif
+ return screen;
+ }
#if defined(GALLIUM_I915)
if (strcmp(driver_name, "i915") == 0)
diff --git a/src/gallium/targets/dri/Makefile.am b/src/gallium/targets/dri/Makefile.am
index 61d6bc7..5a4e32a 100644
--- a/src/gallium/targets/dri/Makefile.am
+++ b/src/gallium/targets/dri/Makefile.am
@@ -146,6 +146,12 @@ STATIC_TARGET_CPPFLAGS += -DGALLIUM_SOFTPIPE
STATIC_TARGET_LIB_DEPS += \
$(top_builddir)/src/gallium/winsys/sw/dri/libswdri.la \
$(top_builddir)/src/gallium/drivers/softpipe/libsoftpipe.la
+
+if HAVE_DRI2
+MEGADRIVERS += kms_swrast
+STATIC_TARGET_LIB_DEPS += \
+ $(top_builddir)/src/gallium/winsys/sw/kms-dri/libswkmsdri.la
+endif
endif
if NEED_GALLIUM_LLVMPIPE_DRIVER
diff --git a/src/gallium/targets/dri/SConscript b/src/gallium/targets/dri/SConscript
index faf370f..8cb90b3 100644
--- a/src/gallium/targets/dri/SConscript
+++ b/src/gallium/targets/dri/SConscript
@@ -36,6 +36,7 @@ env.Prepend(LIBS = [
svgadrm,
svga,
ws_dri,
+ ws_kms_dri,
softpipe,
libloader,
mesa,
@@ -55,6 +56,9 @@ module = env.LoadableModule(
env.Command('vmwgfx_dri.so', 'gallium_dri.so', "ln -f ${SOURCE} ${TARGET}")
# swrast_dri.so
env.Command('swrast_dri.so', 'gallium_dri.so', "ln -f ${SOURCE} ${TARGET}")
+# kms_swrast_dri.so
+env.Command('kms_swrast_dri.so', 'gallium_dri.so', "ln -f ${SOURCE} ${TARGET}")
env.Alias('dri-vmwgfx', module)
env.Alias('dri-swrast', module)
+env.Alias('dri-kms-swrast', module)
diff --git a/src/gallium/winsys/Makefile.am b/src/gallium/winsys/Makefile.am
index 7c4e5ad..4c01afd 100644
--- a/src/gallium/winsys/Makefile.am
+++ b/src/gallium/winsys/Makefile.am
@@ -30,6 +30,10 @@ if HAVE_DRISW
SUBDIRS += sw/dri
endif
+if HAVE_DRI2
+SUBDIRS += sw/kms-dri
+endif
+
if HAVE_EGL_PLATFORM_FBDEV
SUBDIRS += sw/fbdev
endif
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..cb3b61d
--- /dev/null
+++ b/src/gallium/winsys/sw/kms-dri/Makefile.am
@@ -0,0 +1,32 @@
+# 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_CFLAGS = \
+ $(GALLIUM_WINSYS_CFLAGS) \
+ $(LIBDRM_CFLAGS)
+
+noinst_LTLIBRARIES = libswkmsdri.la
+
+libswkmsdri_la_SOURCES = kms_dri_sw_winsys.c
diff --git a/src/gallium/winsys/sw/kms-dri/SConscript b/src/gallium/winsys/sw/kms-dri/SConscript
new file mode 100644
index 0000000..0a6c335
--- /dev/null
+++ b/src/gallium/winsys/sw/kms-dri/SConscript
@@ -0,0 +1,26 @@
+#######################################################################
+# SConscript for kms-dri winsys
+
+
+Import('*')
+
+if env['platform'] not in ('linux'):
+ Return()
+
+env = env.Clone()
+
+env.PkgUseModules('DRM')
+
+env.Append(CPPPATH = [
+# 'include',
+ '#/src/gallium/include',
+ '#/src/gallium/auxiliary',
+])
+
+ws_kms_dri = env.ConvenienceLibrary(
+ target = 'ws_kms_dri',
+ source = [
+ 'kms_dri_sw_winsys.c',
+ ]
+)
+Export('ws_kms_dri')
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..e21c4c2
--- /dev/null
+++ b/src/gallium/winsys/sw/kms-dri/kms_dri_sw_winsys.c
@@ -0,0 +1,312 @@
+/**************************************************************************
+ *
+ * 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;
+ create_req.handle = 0;
+ 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 prot, 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;
+
+ prot = (flags == PIPE_TRANSFER_READ) ? PROT_READ : (PROT_READ | PROT_WRITE);
+ kms_sw_dt->mapped = mmap(0, kms_sw_dt->size, prot, MAP_SHARED,
+ kms_sw->fd, map_req.offset);
+
+ if (kms_sw_dt->mapped == MAP_FAILED)
+ return NULL;
+
+ 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,
+ struct pipe_box *box)
+{
+ /* 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: */
\ No newline at end of file
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
--
2.0.0
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