loader: introduce the loader util lib

All the various window system integration layers duplicate roughly the
same code for figuring out device and driver name, pci-id's, etc.  Which
is sad.  So extract it out into a loader util lib.

v2 (Emil)
* Separate the introduction of libloader from the code de-duplication.
* Strip out non-pci devices support.
* Add scons + Android build system support.
* Add VISIBILITY_CFLAGS to avoid exporting the loader funcs.

v3 (Emil)
* PIPE_OS_ANDROID is undefined at this scope, use ANDROID
* Make sure we define _EGL_NO_DRM when building only swrast

Signed-off-by: Rob Clark <robclark@freedesktop.org>
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Kristian Høgsberg <krh@bitplanet.net>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

Android.mk

@@ -78,6 +78,7 @@ endif
 ifneq ($(strip $(MESA_GPU_DRIVERS)),)
 
 SUBDIRS := \
+	src/loader \
 	src/mapi \
 	src/glsl \
 	src/mesa \

configure.ac

@@ -2059,6 +2059,7 @@ AC_CONFIG_FILES([Makefile
 		src/glx/Makefile
 		src/glx/tests/Makefile
 		src/gtest/Makefile
+		src/loader/Makefile
 		src/mapi/Makefile
 		src/mapi/es1api/Makefile
 		src/mapi/es1api/glesv1_cm.pc

include/pci_ids/pci_id_driver_map.h

@@ -2,6 +2,7 @@
 #define _PCI_ID_DRIVER_MAP_H_
 
 #include <stddef.h>
+#include "loader.h"
 
 #ifndef ARRAY_SIZE
 #define ARRAY_SIZE(a) (sizeof(a) / sizeof((a)[0]))
@@ -19,7 +20,6 @@ static const int i965_chip_ids[] = {
 #undef CHIPSET
 };
 
-#ifndef DRIVER_MAP_GALLIUM_ONLY
 static const int r100_chip_ids[] = {
 #define CHIPSET(chip, name, family) chip,
 #include "pci_ids/radeon_pci_ids.h"
@@ -31,7 +31,6 @@ static const int r200_chip_ids[] = {
 #include "pci_ids/r200_pci_ids.h"
 #undef CHIPSET
 };
-#endif
 
 static const int r300_chip_ids[] = {
 #define CHIPSET(chip, name, family) chip,
@@ -62,18 +61,17 @@ static const struct {
    const char *driver;
    const int *chip_ids;
    int num_chips_ids;
+   unsigned driver_types;
 } driver_map[] = {
-   { 0x8086, "i915", i915_chip_ids, ARRAY_SIZE(i915_chip_ids) },
+   { 0x8086, "i915", i915_chip_ids, ARRAY_SIZE(i915_chip_ids), _LOADER_DRI | _LOADER_GALLIUM },
-   { 0x8086, "i965", i965_chip_ids, ARRAY_SIZE(i965_chip_ids) },
+   { 0x8086, "i965", i965_chip_ids, ARRAY_SIZE(i965_chip_ids), _LOADER_DRI | _LOADER_GALLIUM },
-#ifndef DRIVER_MAP_GALLIUM_ONLY
+   { 0x1002, "radeon", r100_chip_ids, ARRAY_SIZE(r100_chip_ids), _LOADER_DRI },
-   { 0x1002, "radeon", r100_chip_ids, ARRAY_SIZE(r100_chip_ids) },
+   { 0x1002, "r200", r200_chip_ids, ARRAY_SIZE(r200_chip_ids), _LOADER_DRI },
-   { 0x1002, "r200", r200_chip_ids, ARRAY_SIZE(r200_chip_ids) },
+   { 0x1002, "r300", r300_chip_ids, ARRAY_SIZE(r300_chip_ids), _LOADER_GALLIUM },
-#endif
+   { 0x1002, "r600", r600_chip_ids, ARRAY_SIZE(r600_chip_ids), _LOADER_GALLIUM },
-   { 0x1002, "r300", r300_chip_ids, ARRAY_SIZE(r300_chip_ids) },
+   { 0x1002, "radeonsi", radeonsi_chip_ids, ARRAY_SIZE(radeonsi_chip_ids), _LOADER_GALLIUM},
-   { 0x1002, "r600", r600_chip_ids, ARRAY_SIZE(r600_chip_ids) },
+   { 0x10de, "nouveau", NULL, -1,  _LOADER_GALLIUM  },
-   { 0x1002, "radeonsi", radeonsi_chip_ids, ARRAY_SIZE(radeonsi_chip_ids) },
+   { 0x15ad, "vmwgfx", vmwgfx_chip_ids, ARRAY_SIZE(vmwgfx_chip_ids), _LOADER_GALLIUM },
-   { 0x10de, "nouveau", NULL, -1 },
-   { 0x15ad, "vmwgfx", vmwgfx_chip_ids, ARRAY_SIZE(vmwgfx_chip_ids) },
    { 0x0000, NULL, NULL, 0 },
 };
 

src/Makefile.am

@@ -19,7 +19,7 @@
 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 # IN THE SOFTWARE.
 
-SUBDIRS = gtest mapi
+SUBDIRS = gtest loader mapi
 
 if NEED_OPENGL_COMMON
 SUBDIRS += glsl mesa

src/SConscript

@@ -11,6 +11,7 @@ if env['hostonly']:
     # compilation
     Return()
 
+SConscript('loader/SConscript')
 
 # When env['gles'] is set, the targets defined in mapi/glapi/SConscript are not
 # used.  libgl-xlib and libgl-gdi adapt themselves to use the targets defined

src/egl/drivers/dri2/Android.mk

@@ -39,6 +39,7 @@ LOCAL_CFLAGS := \
 LOCAL_C_INCLUDES := \
 	$(MESA_TOP)/src/mapi \
 	$(MESA_TOP)/src/egl/main \
+	$(MESA_TOP)/src/loader \
 	$(DRM_GRALLOC_TOP) \
 	$(DRM_TOP) \
 	$(DRM_TOP)/include/drm

src/egl/drivers/dri2/Makefile.am

@@ -22,6 +22,7 @@
 AM_CFLAGS = \
 	-I$(top_srcdir)/include \
 	-I$(top_srcdir)/src/egl/main \
+	-I$(top_srcdir)/src/loader \
 	-I$(top_srcdir)/src/gbm/main \
 	-I$(top_srcdir)/src/gbm/backends/dri \
 	-I$(top_srcdir)/src/egl/wayland/wayland-egl \

src/gallium/auxiliary/pipe-loader/Makefile.am

@@ -3,6 +3,7 @@ AUTOMAKE_OPTIONS = subdir-objects
 AM_CPPFLAGS = $(DEFINES) \
 	$(GALLIUM_PIPE_LOADER_DEFINES) \
 	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/src/loader \
 	-I$(top_srcdir)/src/gallium/include \
 	-I$(top_srcdir)/src/gallium/auxiliary \
 	-I$(top_srcdir)/src/gallium/winsys

src/gallium/state_trackers/egl/Makefile.am

@@ -66,6 +66,7 @@ libegl_la_SOURCES += $(drm_FILES)
 AM_CFLAGS += \
 	$(LIBDRM_CFLAGS)
 AM_CPPFLAGS += \
+	-I$(top_srcdir)/src/loader \
 	-I$(top_srcdir)/src/gallium/winsys \
 	-I$(top_srcdir)/src/gbm/main \
 	-I$(top_srcdir)/src/gallium/state_trackers/gbm \

src/gallium/state_trackers/egl/SConscript

@@ -33,6 +33,7 @@ else:
         # XXX: Disabled as it depends on gbm, which is not yet built with scons
         env.Append(CPPDEFINES = ['HAVE_DRM_BACKEND'])
         env.Append(CPPPATH = [
+            '#/src/loader',
             '#/src/gbm/main',
             '#/src/gallium/state_trackers/gbm',
         ])

src/gallium/targets/egl-static/Android.mk

@@ -39,6 +39,7 @@ LOCAL_C_INCLUDES := \
 	$(GALLIUM_TOP)/state_trackers/vega \
 	$(GALLIUM_TOP)/state_trackers/egl \
 	$(MESA_TOP)/src/egl/main \
+	$(MESA_TOP)/src/loader \
 	$(MESA_TOP)/src/mesa
 
 # swrast

src/gallium/targets/egl-static/Makefile.am

@@ -36,6 +36,7 @@ AM_CFLAGS = $(PTHREAD_CFLAGS)
 AM_CPPFLAGS = \
 	$(GALLIUM_CFLAGS) \
 	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/src/loader \
 	-I$(top_srcdir)/src/gallium/drivers \
 	-I$(top_srcdir)/src/gallium/winsys \
 	-I$(top_srcdir)/src/gallium/include \

src/gallium/targets/egl-static/SConscript

@@ -7,6 +7,7 @@ env = env.Clone()
 
 env.Append(CPPPATH = [
     '#/include',
+    '#/src/loader',
     '#/src/egl/main',
     '#/src/gallium/auxiliary',
     '#/src/gallium/drivers',

src/gbm/Makefile.am

@@ -7,6 +7,7 @@ AM_CFLAGS = \
 	-D_OS_UNIX=1 \
 	-DMODULEDIR='"$(libdir)/gbm"' \
 	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/src/loader \
 	-I$(top_srcdir)/src/gbm/main \
 	$(LIBUDEV_CFLAGS) \
 	$(LIBKMS_CFLAGS) \
@@ -21,7 +22,10 @@ libgbm_la_SOURCES = \
 	main/backend.c \
 	main/common.c
 libgbm_la_LDFLAGS = -version-info 1:0
-libgbm_la_LIBADD = $(LIBUDEV_LIBS) $(LIBKMS_LIBS) $(DLOPEN_LIBS)
+libgbm_la_LIBADD = \
+	$(LIBUDEV_LIBS) \
+	$(LIBKMS_LIBS) \
+	$(DLOPEN_LIBS)
 
 if HAVE_EGL_PLATFORM_WAYLAND
 AM_CPPFLAGS = -DHAVE_WAYLAND_PLATFORM

src/glx/Makefile.am

@@ -35,6 +35,7 @@ endif
 AM_CFLAGS = \
 	-I$(top_srcdir)/include \
 	-I$(top_srcdir)/include/GL/internal \
+	-I$(top_srcdir)/src/loader \
 	-I$(top_srcdir)/src/mapi \
 	-I$(top_srcdir)/src/mapi/glapi \
 	-I$(top_builddir)/src/mapi \

src/glx/SConscript

@@ -11,6 +11,7 @@ env.Prepend(CPPPATH = [
 	'.',           # the build/<platform>/glx/ directory
 	'#include',
 	'#include/GL/internal',
+	'#src/loader',
 	'#src/mesa',
 	'#src/mapi',
 	'#src/mapi/glapi',

src/loader/Android.mk

@@ -0,0 +1,48 @@
+# Mesa 3-D graphics library
+#
+# Copyright (C) 2014 Emil Velikov <emil.l.velikov@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, 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 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.
+
+LOCAL_PATH := $(call my-dir)
+
+include $(LOCAL_PATH)/Makefile.sources
+
+# ---------------------------------------
+# Build libloader
+# ---------------------------------------
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES := \
+	$(LOADER_C_FILES)
+
+# swrast only
+ifeq ($(MESA_GPU_DRIVERS),swrast)
+	LOCAL_CFLAGS += -D_EGL_NO_DRM
+else
+LOCAL_C_INCLUDES += \
+	$(DRM_TOP)/include/drm \
+	$(DRM_TOP)
+endif
+
+LOCAL_MODULE := libloader
+
+include $(MESA_COMMON_MK)
+include $(BUILD_STATIC_LIBRARY)

src/loader/Makefile.am

@@ -0,0 +1,37 @@
+# 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 Makefile.sources
+
+noinst_LTLIBRARIES = libloader.la
+
+libloader_la_CPPFLAGS = \
+	$(DEFINES) \
+	-I$(top_srcdir)/include \
+	$(VISIBILITY_CFLAGS) \
+	$(LIBDRM_CFLAGS) \
+	$(LIBUDEV_CFLAGS)
+
+libloader_la_LIBADD = \
+	$(LIBDRM_LIBS) \
+	$(LIBUDEV_LIBS)
+
+libloader_la_SOURCES = $(LOADER_C_FILES)

src/loader/Makefile.sources

@@ -0,0 +1,2 @@
+LOADER_C_FILES := \
+	loader.c

src/loader/SConscript

@@ -0,0 +1,28 @@
+Import('*')
+
+if not env['drm']:
+    Return()
+
+env = env.Clone()
+
+env.Prepend(CPPPATH = [
+    '.',
+    '#include'
+])
+
+env.PkgUseModules('DRM')
+
+if env['udev']:
+    env.PkgUseModules('UDEV')
+    env.Append(CPPDEFINES = ['HAVE_LIBUDEV'])
+
+# parse Makefile.sources
+sources = env.ParseSourceList('Makefile.sources', 'LOADER_C_FILES')
+
+libloader = env.ConvenienceLibrary(
+    target = 'libloader',
+    source = sources,
+)
+
+env.Alias('libloader', libloader)
+Export('libloader')

src/loader/loader.c

@@ -0,0 +1,304 @@
+/*
+ * Copyright (C) 2013 Rob Clark <robclark@freedesktop.org>
+ *
+ * This code is derived from the following files.
+ *
+ * * src/glx/dri3_common.c
+ * Copyright © 2013 Keith Packard
+ *
+ * * src/egl/drivers/dri2/common.c
+ * * src/gbm/backends/dri/driver_name.c
+ * Copyright © 2011 Intel Corporation
+ *
+ * Authors:
+ *    Kristian Høgsberg <krh@bitplanet.net>
+ *    Benjamin Franzke <benjaminfranzke@googlemail.com>
+ *
+ * * src/gallium/targets/egl-static/egl.c
+ * Copyright (C) 2010-2011 LunarG Inc.
+ *
+ * Authors:
+ *    Chia-I Wu <olv@lunarg.com>
+ *
+ * * src/gallium/state_trackers/egl/drm/native_drm.c
+ * Copyright (C) 2010 Chia-I Wu <olv@0xlab.org>
+ *
+ * * src/egl/drivers/dri2/platform_android.c
+ *
+ * Copyright (C) 2010-2011 Chia-I Wu <olvaffe@gmail.com>
+ * Copyright (C) 2010-2011 LunarG Inc.
+ *
+ * Based on platform_x11, which has
+ *
+ * Copyright © 2011 Intel Corporation
+ *
+ * * src/gallium/auxiliary/pipe-loader/pipe_loader_drm.c
+ * Copyright 2011 Intel Corporation
+ * Copyright 2012 Francisco Jerez
+ * All Rights Reserved.
+ *
+ * Authors:
+ *    Kristian Høgsberg <krh@bitplanet.net>
+ *    Benjamin Franzke <benjaminfranzke@googlemail.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, 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.
+ *
+ * Authors:
+ *    Rob Clark <robclark@freedesktop.org>
+ */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <string.h>
+#include "loader.h"
+
+#include <xf86drm.h>
+
+#define __IS_LOADER
+#include "pci_ids/pci_id_driver_map.h"
+
+static void default_logger(int level, const char *fmt, ...)
+{
+   if (level >= _LOADER_WARNING) {
+      va_list args;
+      va_start(args, fmt);
+      vfprintf(stderr, fmt, args);
+      va_end(args);
+      fprintf(stderr, "\n");
+   }
+}
+
+static void (*log)(int level, const char *fmt, ...) = default_logger;
+
+#ifdef HAVE_LIBUDEV
+#include <libudev.h>
+
+static inline struct udev_device *
+udev_device_new_from_fd(struct udev *udev, int fd)
+{
+   struct udev_device *device;
+   struct stat buf;
+
+   if (fstat(fd, &buf) < 0) {
+      log(_LOADER_WARNING, "MESA-LOADER: failed to stat fd %d", fd);
+      return NULL;
+   }
+
+   device = udev_device_new_from_devnum(udev, 'c', buf.st_rdev);
+   if (device == NULL) {
+      log(_LOADER_WARNING,
+              "MESA-LOADER: could not create udev device for fd %d", fd);
+      return NULL;
+   }
+
+   return device;
+}
+
+int
+loader_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
+{
+   struct udev *udev = NULL;
+   struct udev_device *device = NULL, *parent;
+   struct stat buf;
+   const char *pci_id;
+
+   *chip_id = -1;
+
+   udev = udev_new();
+   device = udev_device_new_from_fd(udev, fd);
+   if (!device)
+      goto out;
+
+   parent = udev_device_get_parent(device);
+   if (parent == NULL) {
+      log(_LOADER_WARNING, "MESA-LOADER: could not get parent device");
+      goto out;
+   }
+
+   pci_id = udev_device_get_property_value(parent, "PCI_ID");
+   if (pci_id == NULL ||
+       sscanf(pci_id, "%x:%x", vendor_id, chip_id) != 2) {
+      log(_LOADER_WARNING, "MESA-LOADER: malformed or no PCI ID");
+      *chip_id = -1;
+      goto out;
+   }
+
+out:
+   if (device)
+      udev_device_unref(device);
+   if (udev)
+      udev_unref(udev);
+
+   return (*chip_id >= 0);
+}
+
+#elif defined(ANDROID) && !defined(_EGL_NO_DRM)
+
+/* for i915 */
+#include <i915_drm.h>
+/* for radeon */
+#include <radeon_drm.h>
+
+int
+loader_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
+{
+   drmVersionPtr version;
+
+   *chip_id = -1;
+
+   version = drmGetVersion(fd);
+   if (!version) {
+      log(_LOADER_WARNING, "MESA-LOADER: invalid drm fd");
+      return FALSE;
+   }
+   if (!version->name) {
+      log(_LOADER_WARNING, "MESA-LOADER: unable to determine the driver name");
+      drmFreeVersion(version);
+      return FALSE;
+   }
+
+   if (strcmp(version->name, "i915") == 0) {
+      struct drm_i915_getparam gp;
+      int ret;
+
+      *vendor_id = 0x8086;
+
+      memset(&gp, 0, sizeof(gp));
+      gp.param = I915_PARAM_CHIPSET_ID;
+      gp.value = chip_id;
+      ret = drmCommandWriteRead(fd, DRM_I915_GETPARAM, &gp, sizeof(gp));
+      if (ret) {
+         log(_LOADER_WARNING, "MESA-LOADER: failed to get param for i915");
+	 *chip_id = -1;
+      }
+   }
+   else if (strcmp(version->name, "radeon") == 0) {
+      struct drm_radeon_info info;
+      int ret;
+
+      *vendor_id = 0x1002;
+
+      memset(&info, 0, sizeof(info));
+      info.request = RADEON_INFO_DEVICE_ID;
+      info.value = (unsigned long) chip_id;
+      ret = drmCommandWriteRead(fd, DRM_RADEON_INFO, &info, sizeof(info));
+      if (ret) {
+         log(_LOADER_WARNING, "MESA-LOADER: failed to get info for radeon");
+	 *chip_id = -1;
+      }
+   }
+   else if (strcmp(version->name, "nouveau") == 0) {
+      *vendor_id = 0x10de;
+      /* not used */
+      *chip_id = 0;
+   }
+   else if (strcmp(version->name, "vmwgfx") == 0) {
+      *vendor_id = 0x15ad;
+      /* assume SVGA II */
+      *chip_id = 0x0405;
+   }
+
+   drmFreeVersion(version);
+
+   return (*chip_id >= 0);
+}
+
+#else
+
+int
+loader_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id)
+{
+   return 0;
+}
+
+#endif
+
+
+char *
+loader_get_device_name_for_fd(int fd)
+{
+   char *device_name = NULL;
+#ifdef HAVE_LIBUDEV
+   struct udev *udev;
+   struct udev_device *device;
+   const char *const_device_name;
+
+   udev = udev_new();
+   device = udev_device_new_from_fd(udev, fd);
+   if (device == NULL)
+      return NULL;
+
+   const_device_name = udev_device_get_devnode(device);
+   if (!const_device_name)
+      goto out;
+   device_name = strdup(const_device_name);
+
+out:
+   udev_device_unref(device);
+   udev_unref(udev);
+#endif
+   return device_name;
+}
+
+char *
+loader_get_driver_for_fd(int fd, unsigned driver_types)
+{
+   int vendor_id, chip_id, i, j;
+   char *driver = NULL;
+
+   if (!driver_types)
+      driver_types = _LOADER_GALLIUM | _LOADER_DRI;
+
+   if (!loader_get_pci_id_for_fd(fd, &vendor_id, &chip_id)) {
+      log(_LOADER_WARNING, "failed to get driver name for fd %d", fd);
+      return NULL;
+   }
+
+   for (i = 0; driver_map[i].driver; i++) {
+      if (vendor_id != driver_map[i].vendor_id)
+         continue;
+
+      if (!(driver_types & driver_map[i].driver_types))
+         continue;
+
+      if (driver_map[i].num_chips_ids == -1) {
+         driver = strdup(driver_map[i].driver);
+         goto out;
+      }
+
+      for (j = 0; j < driver_map[i].num_chips_ids; j++)
+         if (driver_map[i].chip_ids[j] == chip_id) {
+            driver = strdup(driver_map[i].driver);
+            goto out;
+         }
+   }
+
+out:
+   log(driver ? _LOADER_INFO : _LOADER_WARNING,
+         "pci id for fd %d: %04x:%04x, driver %s",
+         fd, vendor_id, chip_id, driver);
+   return driver;
+}
+
+void
+loader_set_logger(void (*logger)(int level, const char *fmt, ...))
+{
+   log = logger;
+}

src/loader/loader.h

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2013 Rob Clark <robclark@freedesktop.org>
+ *
+ * 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.
+ *
+ * Authors:
+ *    Rob Clark <robclark@freedesktop.org>
+ */
+
+#ifndef LOADER_H
+#define LOADER_H
+
+/* Helpers to figure out driver and device name, eg. from pci-id, etc. */
+
+#define _LOADER_DRI          (1 << 0)
+#define _LOADER_GALLIUM      (1 << 1)
+
+int
+loader_get_pci_id_for_fd(int fd, int *vendor_id, int *chip_id);
+
+char *
+loader_get_driver_for_fd(int fd, unsigned driver_types);
+
+char *
+loader_get_device_name_for_fd(int fd);
+
+
+/* for logging.. keep this aligned with egllog.h so we can just use
+ * _eglLog directly.
+ */
+
+#define _LOADER_FATAL   0   /* unrecoverable error */
+#define _LOADER_WARNING 1   /* recoverable error/problem */
+#define _LOADER_INFO    2   /* just useful info */
+#define _LOADER_DEBUG   3   /* useful info for debugging */
+
+void
+loader_set_logger(void (*logger)(int level, const char *fmt, ...));
+
+#endif /* LOADER_H */