Re: [PATCH 0/3] drm: omapdrm: Fix excessive GEM buffers DMM/CMA usage

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Hi,

On 28.03.22 г. 12:46 ч., Tomi Valkeinen wrote:
Hi,

On 19/01/2022 12:23, Ivaylo Dimitrov wrote:
This patch series fixes excessive DMM or CMA usage of GEM buffers leading to various runtime allocation failures. The series enables daily usage of devices without exausting limited resources like CMA or DMM space if GPU rendering is
needed.

The first patch doesn't bring any functional changes, it just moves some
TILER/DMM related code to a separate function, to simplify the review of the
next two patches.

The second patch allows off-CPU rendering to non-scanout buffers. Without that patch, it is basically impossible to use the driver allocated GEM buffers on OMAP3 for anything else but a basic CPU rendered examples as if we want GPU rendering, we must allocate buffers as scanout buffers, which are CMA allocated. CMA soon gets fragmented and we start seeing allocation failures. Such failres in Xorg cannot be handeled gracefully, so the system is basically unusable.

Third patch fixes similar issue on OMAP4/5, where DMM/TILER spaces get
fragmented with time, leading to allocation failures.

Series were tested on Motolola Droid4 and Nokia N900, with OMAP DDX and
PVR EXA from https://github.com/maemo-leste/xf86-video-omap

Ivaylo Dimitrov (3):
   drm: omapdrm: simplify omap_gem_pin
   drm: omapdrm: Support exporting of non-contiguous GEM BOs
   drm: omapdrm: Do no allocate non-scanout GEMs through DMM/TILER

  drivers/gpu/drm/omapdrm/omap_gem.c        | 198 +++++++++++++++++-------------
  drivers/gpu/drm/omapdrm/omap_gem.h        |   3 +-
  drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c |   5 +-
  3 files changed, 116 insertions(+), 90 deletions(-)


I have pushed this to drm-misc-next.


Great, next is VRFB and TE support for Droid4 panel, as soon as I find some spare time :)

Ivo




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