linux

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History

Dave Airlie ebff5fa9d5 Revert "i915: Update VGA arbiter support for newer devices" This reverts commit `81b5c7bc8d`. Adding drm/i915 into the vga arbiter chain means that X (in a piece of well-meant paranoia) will do a get/put on the vga decoding around _every_ accel call down into the ddx. Which results in some nice performance disasters [1]. This really breaks userspace, by disabling DRI for everyone, and stops OpenGL from working, this isn't limited to just the i915 but both the integrated and discrete GPUs on multi-gpu systems, in other words this causes untold worlds of pain, Ville tried to come up with a Great Hack to fiddle the required VGA I/O ops behind everyone's back using stop_machine, but that didn't really work out [2]. Given that we're fairly late in the -rc stage for such games let's just revert this all. One thing we might want to keep is to delay the disabling of the vga decoding until the fbdev emulation and the fbcon screen is set up. If we kill vga mem decoding beforehand fbcon can end up with a white square in the top-left corner it tried to save from the vga memory for a seamless transition. And we have bug reports on older platforms which seem to match these symptoms. But again that's something to play around with in -next. References: [1] http://lists.x.org/archives/xorg-devel/2013-September/037763.html References: [2] http://www.spinics.net/lists/intel-gfx/msg34062.html Cc: Alex Williamson <alex.williamson@redhat.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Dave Airlie <airlied@redhat.com>		2013-10-11 15:19:22 +10:00
..
ast	drm/ast: fix the ast open key function	2013-09-12 15:32:41 +10:00
cirrus	Merge branch 'drm-next-3.12' of git://people.freedesktop.org/~agd5f/linux into drm-next	2013-09-02 09:31:40 +10:00
exynos	drm/exynos: fix return value check in lowlevel_buffer_allocate()	2013-09-16 21:57:08 +09:00
gma500	drm/gma500: fix things after get/put page helpers	2013-10-09 16:04:32 +10:00
i2c	drm/i2c: tda998x: fix audio muting	2013-09-24 09:41:18 -07:00
i810
i915	Revert "i915: Update VGA arbiter support for newer devices"	2013-10-11 15:19:22 +10:00
mga
mgag200	Merge branch 'drm-next-3.12' of git://people.freedesktop.org/~agd5f/linux into drm-next	2013-09-02 09:31:40 +10:00
msm	drm/msm: use drm_gem_dumb_destroy helper	2013-09-28 10:14:06 -04:00
nouveau	Merge remote-tracking branch 'nouveau/drm-nouveau-next' into drm-fixes	2013-10-09 16:09:25 +10:00
omapdrm	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2013-09-05 10:17:26 -07:00
qxl
r128
radeon	drm/radeon: re-enable sw ACR support on pre-DCE4	2013-10-10 11:47:01 -04:00
rcar-du
savage
shmobile
sis
tdfx
tilcdc	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2013-09-05 10:17:26 -07:00
ttm	Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux	2013-09-18 21:17:44 -05:00
udl	drm/udl: rip out set_need_resched	2013-09-16 08:35:04 +10:00
via
vmwgfx	Merge branch 'drm-next-3.12' of git://people.freedesktop.org/~agd5f/linux into drm-next	2013-09-02 09:31:40 +10:00
ati_pcigart.c
drm_agpsupport.c
drm_auth.c
drm_buffer.c
drm_bufs.c
drm_cache.c
drm_context.c	Revert "drm: mark context support as a legacy subsystem"	2013-09-20 08:32:59 +10:00
drm_crtc.c	drm: fix DRM_IOCTL_MODE_GETFB handle-leak	2013-09-02 10:51:36 +10:00
drm_crtc_helper.c	drm: Add drm_bridge	2013-09-02 10:23:26 +10:00
drm_debugfs.c
drm_dma.c
drm_dp_helper.c
drm_drv.c
drm_edid.c	drm/edid: catch kmalloc failure in drm_edid_to_speaker_allocation	2013-10-09 17:13:43 -04:00
drm_edid_load.c
drm_encoder_slave.c
drm_fb_cma_helper.c
drm_fb_helper.c	Revert "drm/fb-helper: don't sleep for screen unblank when an oops is in progress"	2013-10-10 07:05:41 +10:00
drm_flip_work.c
drm_fops.c	Revert "drm: mark context support as a legacy subsystem"	2013-09-20 08:32:59 +10:00
drm_gem.c
drm_gem_cma_helper.c	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2013-09-05 10:17:26 -07:00
drm_global.c
drm_hashtab.c
drm_info.c
drm_ioc32.c
drm_ioctl.c
drm_irq.c
drm_lock.c
drm_memory.c
drm_mm.c
drm_modes.c
drm_pci.c
drm_platform.c
drm_prime.c
drm_rect.c
drm_scatter.c
drm_stub.c	Revert "drm: mark context support as a legacy subsystem"	2013-09-20 08:32:59 +10:00
drm_sysfs.c
drm_trace.h
drm_trace_points.c
drm_usb.c
drm_vm.c
drm_vma_manager.c
Kconfig
Makefile
README.drm

README.drm

************************************************************
* For the very latest on DRI development, please see:      *
*     http://dri.freedesktop.org/                          *
************************************************************

The Direct Rendering Manager (drm) is a device-independent kernel-level
device driver that provides support for the XFree86 Direct Rendering
Infrastructure (DRI).

The DRM supports the Direct Rendering Infrastructure (DRI) in four major
ways:

    1. The DRM provides synchronized access to the graphics hardware via
       the use of an optimized two-tiered lock.

    2. The DRM enforces the DRI security policy for access to the graphics
       hardware by only allowing authenticated X11 clients access to
       restricted regions of memory.

    3. The DRM provides a generic DMA engine, complete with multiple
       queues and the ability to detect the need for an OpenGL context
       switch.

    4. The DRM is extensible via the use of small device-specific modules
       that rely extensively on the API exported by the DRM module.


Documentation on the DRI is available from:
    http://dri.freedesktop.org/wiki/Documentation
    http://sourceforge.net/project/showfiles.php?group_id=387
    http://dri.sourceforge.net/doc/

For specific information about kernel-level support, see:

    The Direct Rendering Manager, Kernel Support for the Direct Rendering
    Infrastructure
    http://dri.sourceforge.net/doc/drm_low_level.html

    Hardware Locking for the Direct Rendering Infrastructure
    http://dri.sourceforge.net/doc/hardware_locking_low_level.html

    A Security Analysis of the Direct Rendering Infrastructure
    http://dri.sourceforge.net/doc/security_low_level.html