linux/drivers/gpu/drm
Ben Gamari f65d94211e drm/i915: Add hangcheck timer
We set a periodic timer to check on the GPU, resetting it every time a
batch is completed. If the timer elapses, we check acthd. If acthd
hasn't changed in two timer periods, we assume the chip is wedged.

This is implemented in such a way that it leaves the option open to
employ adaptive timer intervals in the future. One could wait until
several timer periods have elapsed before declaring the chip dead. If
the chip comes back after several periods but before the "dead"
threshold, the timer interval or dead threshold could be raised.

It is important to note that while checking for active requests, we need
to account for the fact that requests are removed from the list (i.e.
retired) in a deferred work queue handler. This means that merely
checking for an empty request_list is insufficient; the list could be
non-empty yet the GPU still idle, causing the hangcheck timer to
incorrectly mark the GPU as wedged (it took me a while to figure that
out---sigh...)

Signed-off-by: Ben Gamari <bgamari.foss@gmail.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2009-09-17 14:36:01 -07:00
..
i810 drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
i830 drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
i915 drm/i915: Add hangcheck timer 2009-09-17 14:36:01 -07:00
mga drm/mga: Use request_firmware() to load microcode 2009-08-27 10:46:54 +10:00
r128 drm/r128: Add test for initialisation to all ioctls that require it 2009-08-31 09:09:30 +10:00
radeon drm/radeon/r600: use fence->timeout directly 2009-09-09 08:17:57 +10:00
savage drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
sis drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
tdfx
ttm drm/ttm: consolidate cache flushing code in one place. 2009-08-27 09:53:47 +10:00
via drm/via: Fix vblank IRQ on VIA hardware. 2009-07-15 16:00:07 +10:00
ati_pcigart.c drm/ati_pcigart: use memset_io to reset the memory 2009-03-13 14:24:14 +10:00
drm_agpsupport.c agp: switch AGP to use page array instead of unsigned long array 2009-06-19 10:21:42 +10:00
drm_auth.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_bufs.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_cache.c drm: fix drm_cache.c for arch with no support. 2009-09-02 09:41:13 +10:00
drm_context.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_crtc.c drm: split crtc/fb helpers into a separate module 2009-09-07 15:45:33 +10:00
drm_crtc_helper.c drm: prune modes when output is disconnected. 2009-09-08 11:51:46 +10:00
drm_debugfs.c drm: drm_debugfs, check kmalloc retval 2009-07-15 15:55:37 +10:00
drm_dma.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_drawable.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_drv.c drm: remove root requirement from DRM_IOCTL_SET_VERSION (+ DRM_IOCTL_AUTH_MAGIC) 2009-08-19 15:51:55 +10:00
drm_edid.c drm: shut the EDID warnings up. 2009-09-08 11:48:40 +10:00
drm_encoder_slave.c drm: fixup include file in drm_encoder_slave 2009-08-13 13:31:54 +10:00
drm_fb_helper.c drm/kms: fix kms helper license + Kconfig 2009-09-08 11:15:58 +10:00
drm_fops.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_gem.c drm: GEM handles are u32, not int 2009-08-27 11:21:08 +10:00
drm_hashtab.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_info.c drm: merge Linux master into HEAD 2009-03-28 20:22:18 -04:00
drm_ioc32.c drm: Only use DRM_IOCTL_UPDATE_DRAW compat wrapper for compat X86. 2009-03-13 14:24:04 +10:00
drm_ioctl.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_irq.c drm: silence pointless vblank warning. 2009-08-09 12:24:01 +10:00
drm_lock.c drm: Avoid client deadlocks when the master disappears. 2009-03-03 09:50:20 +10:00
drm_memory.c agp: switch AGP to use page array instead of unsigned long array 2009-06-19 10:21:42 +10:00
drm_mm.c drm/mm: add ability to dump mm lists via debugfs 2009-09-02 09:39:43 +10:00
drm_modes.c drm/kms: try to find the std mode in DMT table 2009-09-07 16:04:15 +10:00
drm_pci.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_proc.c drm: use proc_create_data() 2009-08-31 09:37:22 +10:00
drm_scatter.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_sman.c drm: Remove memory debugging infrastructure. 2009-06-18 13:00:33 -07:00
drm_stub.c drm: Move a dereference below a NULL test 2009-07-15 16:56:48 +10:00
drm_sysfs.c Merge intel drm-intel-next branch 2009-09-07 20:27:20 +10:00
drm_vm.c agp: switch AGP to use page array instead of unsigned long array 2009-06-19 10:21:42 +10:00
Kconfig drm/i915: force mode set at lid open time 2009-09-10 16:10:00 -07:00
Makefile drm/kms: fix kms helper license + Kconfig 2009-09-08 11:15:58 +10:00
README.drm drm: reorganise drm tree to be more future proof. 2008-07-14 10:45:01 +10:00

************************************************************
* 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