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a6778e9e7f
linux/drivers/gpu/drm
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Ilija Hadzic a6778e9e7f drm: add some comments to drm_wait_vblank and drm_queue_vblank_event 
during the review of the fix for locks problems in drm_wait_vblank,
a couple of false concerns were raised about how the drm_vblank_get
and drm_vblank_put are used in this function; it turned out that the
code is correct and that it cannot be simplified

add a few comments to explain non-obvious flows in the code,
to prevent "false alarms" in the future

v2: incorporate comments received from Daniel Vetter

Signed-off-by: Ilija Hadzic <ihadzic@research.bell-labs.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2011-11-11 11:16:30 +00:00
..
exynos drm/exynos: fixed build warnings and comments. 2011-10-18 10:01:19 +01:00
i2c gpu: add module.h to drivers/gpu files as required. 2011-10-31 19:32:03 -04:00
i810 gpu: add module.h to drivers/gpu files as required. 2011-10-31 19:32:03 -04:00
i915 drm: serialize access to list of debugfs files 2011-11-11 11:05:19 +00:00
mga gpu: add module.h to drivers/gpu files as required. 2011-10-31 19:32:03 -04:00
nouveau gpu: add module.h to drivers/gpu files as required. 2011-10-31 19:32:03 -04:00
r128 gpu: add module.h to drivers/gpu files as required. 2011-10-31 19:32:03 -04:00
radeon drm/radeon/benchmark: signedness bug in radeon_benchmark_move() 2011-11-11 11:16:12 +00:00
savage gpu: add module.h to drivers/gpu files as required. 2011-10-31 19:32:03 -04:00
sis gpu: add module.h to drivers/gpu files as required. 2011-10-31 19:32:03 -04:00
tdfx gpu: add module.h to drivers/gpu files as required. 2011-10-31 19:32:03 -04:00
ttm gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
via gpu: add module.h to drivers/gpu files as required. 2011-10-31 19:32:03 -04:00
vmwgfx vmwgfx: Only allow 64x64 cursors 2011-11-11 10:58:26 +00:00
ati_pcigart.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_agpsupport.c drm: kill drm_agp_chipset_flush 2010-11-23 20:14:44 +00:00
drm_auth.c
drm_buffer.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_bufs.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_cache.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_context.c
drm_crtc_helper.c drm: try to restore previous CRTC config if mode set fails 2011-11-11 11:07:36 +00:00
drm_crtc.c drm: Ensure string is null terminated. 2011-11-11 10:59:15 +00:00
drm_debugfs.c drm: serialize access to list of debugfs files 2011-11-11 11:05:19 +00:00
drm_dma.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_dp_i2c_helper.c
drm_drv.c drm: do not sleep on vblank while holding a mutex 2011-11-11 11:12:47 +00:00
drm_edid_modes.h drm: Mark constant arrays of drm_display_mode const 2011-02-23 11:13:11 +10:00
drm_edid.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_encoder_slave.c gpu: add module.h to drivers/gpu files as required. 2011-10-31 19:32:03 -04:00
drm_fb_helper.c gpu: add module.h to drivers/gpu files as required. 2011-10-31 19:32:03 -04:00
drm_fops.c gpu: add module.h to drivers/gpu files as required. 2011-10-31 19:32:03 -04:00
drm_gem.c drm/gem: add functions for mmap offset creation 2011-08-30 11:06:06 +01:00
drm_global.c
drm_hashtab.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_info.c Merge remote branch 'intel/drm-intel-next' of ../drm-next into drm-core-next 2011-03-14 14:15:13 +10:00
drm_ioc32.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_ioctl.c drm/vblank: update recently added vbl interface to be more future proof. 2011-03-24 21:28:46 +10:00
drm_irq.c drm: add some comments to drm_wait_vblank and drm_queue_vblank_event 2011-11-11 11:16:30 +00:00
drm_lock.c drm: readd drm_lock_free in drm_unlock 2010-09-26 13:35:49 +10:00
drm_memory.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_mm.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_modes.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_pci.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_platform.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_proc.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_scatter.c drivers: use kzalloc/kcalloc instead of 'kmalloc+memset', where possible 2011-07-25 20:57:13 -07:00
drm_sman.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_stub.c drm: Create and use drm_err 2011-04-28 14:53:02 +10:00
drm_sysfs.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_trace_points.c
drm_trace.h
drm_usb.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
drm_vm.c gpu: Add export.h as required to drivers/gpu files. 2011-10-31 19:32:03 -04:00
Kconfig drm: drop select of SLOW_WORK 2011-11-11 11:06:10 +00:00
Makefile DRM: add DRM Driver for Samsung SoC EXYNOS4210. 2011-10-05 10:27:31 +01:00
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