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drm: omapdrm: Do no allocate non-scanout GEMs through DMM/TILER

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On devices with DMM, all allocations are done through either DMM or TILER.
DMM/TILER being a limited resource means that such allocations will start
to fail before actual free memory is exhausted. What is even worse is that
with time DMM/TILER space gets fragmented to the point that even if we have
enough free DMM/TILER space and free memory, allocation fails because there
is no big enough free block in DMM/TILER space.

Such failures can be easily observed with OMAP xorg DDX, for example -
starting few GUI applications (so buffers for their windows are allocated)
and then rotating landscape<->portrait while closing and opening new
windows soon results in allocation failures.

Fix that by mapping buffers through DMM/TILER only when really needed,
like, for scanout buffers.

Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1642587791-13222-4-git-send-email-ivo.g.dimitrov.75@gmail.com
This commit is contained in:
Ivaylo Dimitrov 2022-01-19 12:23:11 +02:00 committed by Tomi Valkeinen
parent 1948d28db6
commit 3ccd59f930
1 changed files with 8 additions and 4 deletions
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12
drivers/gpu/drm/omapdrm/omap_gem.c
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@ -821,10 +821,12 @@ int omap_gem_pin(struct drm_gem_object *obj, dma_addr_t *dma_addr)
if (ret)
goto fail;
if (priv->has_dmm) {
ret = omap_gem_pin_tiler(obj);
if (ret)
goto fail;
if (omap_obj->flags & OMAP_BO_SCANOUT) {
if (priv->has_dmm) {
ret = omap_gem_pin_tiler(obj);
if (ret)
goto fail;
}
}
} else {
refcount_inc(&omap_obj->pin_cnt);
@ -861,6 +863,8 @@ static void omap_gem_unpin_locked(struct drm_gem_object *obj)
kfree(omap_obj->sgt);
omap_obj->sgt = NULL;
}
if (!(omap_obj->flags & OMAP_BO_SCANOUT))
return;
if (priv->has_dmm) {
ret = tiler_unpin(omap_obj->block);
if (ret) {