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99ffa1629d
We still have reports of missed irqs even on Sandybridge with the HWSTAM workaround in place. Testing by the bug reporter gets rid of them with the forcewake voodoo and no HWSTAM writes. Because I've slightly botched the rebasing I've left out the ACTHD readback which is also required to get IVB working. Seems to still work on the tester's machine, so I think we should go with the more minmal approach on SNB. Especially since I've only found weak evidence for holding forcewake while waiting for an interrupt to arrive, but none for the ACTHD readback. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=45181 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=45332 Tested-by: Nicolas Kalkhof nkalkhof()at()web.de Acked-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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* For the very latest on DRI development, please see: *
* http://dri.freedesktop.org/ *
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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