linux/drivers/gpu/drm
Daniel Vetter 6b25a88752 drm/i915: kill cargo-culted locking from power well code
We may not concurrently change the power wells code. Which
is already guaranteed since modesets aren't concurrent. That
leaves races against setup/teardown/suspend/resume, and for
those we already (try) rather hard not to hit concurrent
modesets.

No debug WARN_ON added since that would require us to grab the
modeset locks in init/suspend code. Which is again just cargo
culting since just grabbing the locks in those paths isn't good
enough, we need the right order of operations, too.

Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2013-01-31 11:50:09 +01:00
..
ast Drivers: gpu: remove __dev* attributes. 2013-01-03 15:57:15 -08:00
cirrus Drivers: gpu: remove __dev* attributes. 2013-01-03 15:57:15 -08:00
exynos Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux 2013-01-08 16:08:10 -08:00
gma500 Drivers: gpu: remove __dev* attributes. 2013-01-03 15:57:15 -08:00
i2c drm/i2c: drm_connector_property -> drm_object_property 2012-11-30 10:20:12 -06:00
i810
i915 drm/i915: kill cargo-culted locking from power well code 2013-01-31 11:50:09 +01:00
mga
mgag200 Drivers: gpu: remove __dev* attributes. 2013-01-03 15:57:15 -08:00
nouveau Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux 2013-01-08 16:08:10 -08:00
r128
radeon Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux 2013-01-08 16:08:10 -08:00
savage Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2012-10-03 23:29:23 -07:00
shmobile Drivers: gpu: remove __dev* attributes. 2013-01-03 15:57:15 -08:00
sis
tdfx
tegra Revert "drm: tegra: protect DC register access with mutex" 2012-12-30 21:58:20 +10:00
ttm drm/ttm: fix fence locking in ttm_buffer_object_transfer 2013-01-08 18:35:31 +10:00
udl drm/udl: drm_connector_property -> drm_object_property 2012-11-30 10:20:11 -06:00
via
vmwgfx drm/ttm: remove no_wait_reserve, v3 2012-12-10 20:21:30 +10:00
ati_pcigart.c
drm_agpsupport.c
drm_auth.c
drm_buffer.c
drm_bufs.c
drm_cache.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2012-10-03 23:29:23 -07:00
drm_context.c
drm_crtc.c drm: remove legacy drm_connector_property fxns 2012-11-30 10:30:48 -06:00
drm_crtc_helper.c drm/doc: integrate crtc helper api into docbook 2012-11-28 20:19:58 +10:00
drm_debugfs.c
drm_dma.c
drm_dp_helper.c drm/doc: add new dp helpers into drm DocBook 2012-11-28 20:26:53 +10:00
drm_drv.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2012-10-03 23:29:23 -07:00
drm_edid.c drm/edid: Add drm_rgb_quant_range_selectable() 2013-01-20 13:09:44 +01:00
drm_edid_load.c Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2012-10-03 23:29:23 -07:00
drm_edid_modes.h Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux 2012-10-03 23:29:23 -07:00
drm_encoder_slave.c
drm_fb_cma_helper.c drm: fb: cma: Fail gracefully on allocation failure 2012-10-23 10:14:58 +10:00
drm_fb_helper.c drm: remove legacy drm_connector_property fxns 2012-11-30 10:30:48 -06:00
drm_fops.c drm: set dev_mapping before calling drm_open_helper 2012-11-07 10:51:15 +10:00
drm_gem.c mm: kill vma flag VM_RESERVED and mm->reserved_vm counter 2012-10-09 16:22:19 +09:00
drm_gem_cma_helper.c
drm_global.c
drm_hashtab.c drm: Add a hash-tab rcu-safe API 2012-11-28 18:36:05 +10:00
drm_info.c drm/debugfs: remove redundant info from gem_names 2012-10-23 10:15:04 +10:00
drm_ioc32.c
drm_ioctl.c drm: add support for monotonic vblank timestamps 2012-11-20 16:06:16 +10:00
drm_irq.c drm: hold event_lock while accessing vblank_event_list 2012-11-29 03:30:34 -08:00
drm_lock.c
drm_memory.c
drm_mm.c Merge tag 'drm-intel-next-2012-12-21' of git://people.freedesktop.org/~danvet/drm-intel into drm-next 2013-01-17 20:34:08 +10:00
drm_modes.c drm: Constify some function arguments 2012-11-07 10:09:16 +10:00
drm_pci.c drm/pci: add missing variable initialization 2012-11-29 18:20:31 +10:00
drm_platform.c drm: platform: Don't initialize driver-private data 2012-10-23 10:15:11 +10:00
drm_prime.c
drm_proc.c
drm_scatter.c
drm_stub.c drm: add support for monotonic vblank timestamps 2012-11-20 16:06:16 +10:00
drm_sysfs.c drm: remove legacy drm_connector_property fxns 2012-11-30 10:30:48 -06:00
drm_trace.h
drm_trace_points.c
drm_usb.c
drm_vm.c mm: kill vma flag VM_RESERVED and mm->reserved_vm counter 2012-10-09 16:22:19 +09:00
Kconfig drm: Add NVIDIA Tegra20 support 2012-11-20 15:43:41 +10:00
Makefile drm: only build ati_pcigart if PCI enabled 2012-11-28 20:12:29 +10:00
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