From 1925a9aebd64b2e08574118891394d9d56db25ae Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Wed, 26 Jun 2013 13:04:51 -0700 Subject: i965: Build the driver into a shared mesa_dri_drivers.so . Previously, we've split things such that mesa core is in libdricore, exposing the whole Mesa core interface in the global namespace, and the i965_dri.so code all links against that. Along with polluting application namespace terribly, it requires extra PLT indirections and prevents LTO. Instead, we can build all of the driver contents into the same .so with just a few symbols exposed to be referenced from the actual driver .so file, allowing LTO and reducing our exposed symbol count massively. FPS improvement on GLB2.7 with INTEL_NO_HW=1: 2.61061% +/- 1.16957% (n=50) (without LTO, just the PLT reductions from this commit) Note that the X Server requires commit 7ecfab47eb221dbb996ea6c033348b8eceaeb893 to successfully load this driver! v2: Set a global driverAPI variable so loaders don't have to update to createNewScreen2() (though they may want to for thread safety). v3: Drop AM_CPPFLAGS addition (Emil pointed out I'd missed some cflags that would be necessary, though only if we actually relied on them). v4: Fix install with DESTDIR set. Reviewed-by: Matt Turner (v1) Reviewed-by: Emil Velikov (v2) --- src/mesa/drivers/dri/common/Makefile.am | 3 ++ src/mesa/drivers/dri/common/dri_util.c | 19 ++++++++++++- src/mesa/drivers/dri/common/dri_util.h | 2 +- src/mesa/drivers/dri/common/megadriver_stub.c | 41 +++++++++++++++++++++++++++ 4 files changed, 63 insertions(+), 2 deletions(-) create mode 100644 src/mesa/drivers/dri/common/megadriver_stub.c (limited to 'src/mesa/drivers/dri/common') diff --git a/src/mesa/drivers/dri/common/Makefile.am b/src/mesa/drivers/dri/common/Makefile.am index ce4119d0fff..e9c4acaece5 100644 --- a/src/mesa/drivers/dri/common/Makefile.am +++ b/src/mesa/drivers/dri/common/Makefile.am @@ -32,6 +32,7 @@ AM_CFLAGS = \ noinst_LTLIBRARIES = \ libdricommon.la \ + libmegadriver_stub.la \ libdri_test_stubs.la libdricommon_la_SOURCES = \ @@ -43,4 +44,6 @@ libdri_test_stubs_la_SOURCES = \ dri_test.c libdri_test_stubs_la_CFLAGS = $(AM_CFLAGS) -DNO_MAIN +libmegadriver_stub_la_SOURCES = megadriver_stub.c + sysconf_DATA = drirc diff --git a/src/mesa/drivers/dri/common/dri_util.c b/src/mesa/drivers/dri/common/dri_util.c index 2a85703f2ad..c28b0fc4174 100644 --- a/src/mesa/drivers/dri/common/dri_util.c +++ b/src/mesa/drivers/dri/common/dri_util.c @@ -81,6 +81,23 @@ setupLoaderExtensions(__DRIscreen *psp, } } +/** + * This pointer determines which driver API we'll use in the case of the + * loader not passing us an explicit driver extensions list (that would, + * itself, contain a pointer to a driver API.) + * + * A driver's driDriverGetExtensions_drivername() can update this pointer to + * what it's returning, and a loader that is ignorant of createNewScreen2() + * will get the correct driver screen created, as long as no other + * driDriverGetExtensions() happened in between the first one and the + * createNewScreen(). + * + * This allows the X Server to not require the significant dri_interface.h + * updates for doing createNewScreen2(), which would discourage backporting of + * the X Server patches to support the new loader interface. + */ +const struct __DriverAPIRec *globalDriverAPI = &driDriverAPI; + /** * This is the first entrypoint in the driver called by the DRI driver loader * after dlopen()ing it. @@ -102,7 +119,7 @@ dri2CreateNewScreen2(int scrn, int fd, return NULL; /* By default, use the global driDriverAPI symbol (non-megadrivers). */ - psp->driver = &driDriverAPI; + psp->driver = globalDriverAPI; /* If the driver exposes its vtable through its extensions list * (megadrivers), use that instead. diff --git a/src/mesa/drivers/dri/common/dri_util.h b/src/mesa/drivers/dri/common/dri_util.h index 61c80bc4541..5b56061e299 100644 --- a/src/mesa/drivers/dri/common/dri_util.h +++ b/src/mesa/drivers/dri/common/dri_util.h @@ -116,7 +116,7 @@ struct __DriverAPIRec { }; extern const struct __DriverAPIRec driDriverAPI; - +extern const struct __DriverAPIRec *globalDriverAPI; /** * Per-screen private driver information. diff --git a/src/mesa/drivers/dri/common/megadriver_stub.c b/src/mesa/drivers/dri/common/megadriver_stub.c new file mode 100644 index 00000000000..6bf5d73279a --- /dev/null +++ b/src/mesa/drivers/dri/common/megadriver_stub.c @@ -0,0 +1,41 @@ +/* + * Copyright © 2013 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 +#include "dri_util.h" + +static const +__DRIconfig **stub_error_init_screen(__DRIscreen *psp) +{ + fprintf(stderr, "An updated DRI driver loader (libGL.so or X Server) is " + "required for this Mesa driver.\n"); + return NULL; +} + +/** + * This is a stub driDriverAPI that is referenced by dri_util.c but should + * never be used. + */ +const struct __DriverAPIRec driDriverAPI = { + .InitScreen = stub_error_init_screen, +}; -- cgit v1.2.3