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

Am 19.01.22 um 11:23 schrieb Ivaylo Dimitrov:
> 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

With the little expertise I have with omapdrm:

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>

>
> 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(-)
>

--
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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