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drm/omap: use __GFP_DMA32 for shmem-backed gem 

OMAP requires bo-pages to be in the DMA32 zone. Explicitly request this by
setting __GFP_DMA32 as mapping-gfp-mask during shmem initialization. This
drops HIGHMEM from the gfp-mask and uses DMA32 instead. shmem-core takes
care to relocate pages during swap-in in case they have been loaded into
the wrong zone.

It is _not_ possible to pass __GFP_DMA32 to shmem_read_mapping_page_gfp()
as the page might have already been swapped-in at that time. The zone-mask
must be set during initialization and be kept constant for now.

Remove the now superfluous TODO in omap_gem.c.

Reviewed-by: Rob Clark <robdclark@gmail.com>
Tested-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
This commit is contained in:
David Herrmann 2014-05-25 12:45:39 +02:00
parent 4661270797
commit ab5a60c3ee
1 changed files with 8 additions and 9 deletions
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17
drivers/gpu/drm/omapdrm/omap_gem.c
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@ -233,10 +233,6 @@ static int omap_gem_attach_pages(struct drm_gem_object *obj)
WARN_ON(omap_obj->pages);
/* TODO: __GFP_DMA32 .. but somehow GFP_HIGHMEM is coming from the
* mapping_gfp_mask(mapping) which conflicts w/ GFP_DMA32.. probably
* we actually want CMA memory for it all anyways..
*/
pages = drm_gem_get_pages(obj, GFP_KERNEL);
if (IS_ERR(pages)) {
dev_err(obj->dev->dev, "could not get pages: %ld\n", PTR_ERR(pages));
@ -1347,6 +1343,7 @@ struct drm_gem_object *omap_gem_new(struct drm_device *dev,
struct omap_drm_private *priv = dev->dev_private;
struct omap_gem_object *omap_obj;
struct drm_gem_object *obj = NULL;
struct address_space *mapping;
size_t size;
int ret;
@ -1404,14 +1401,16 @@ struct drm_gem_object *omap_gem_new(struct drm_device *dev,
omap_obj->height = gsize.tiled.height;
}
ret = 0;
if (flags & (OMAP_BO_DMA|OMAP_BO_EXT_MEM))
if (flags & (OMAP_BO_DMA|OMAP_BO_EXT_MEM)) {
drm_gem_private_object_init(dev, obj, size);
else
} else {
ret = drm_gem_object_init(dev, obj, size);
if (ret)
goto fail;
if (ret)
goto fail;
mapping = file_inode(obj->filp)->i_mapping;
mapping_set_gfp_mask(mapping, GFP_USER | __GFP_DMA32);
}
return obj;