Messages in this thread | | | Date | Mon, 28 Mar 2022 12:46:16 +0300 | Subject | Re: [PATCH 0/3] drm: omapdrm: Fix excessive GEM buffers DMM/CMA usage | From | Tomi Valkeinen <> |
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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.
Tomi
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