From ab5a60c3ee41ff22304e2bcf63c151aa2851df0c Mon Sep 17 00:00:00 2001 From: David Herrmann Date: Sun, 25 May 2014 12:45:39 +0200 Subject: [PATCH] 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 Tested-by: Tomi Valkeinen Signed-off-by: David Herrmann --- drivers/gpu/drm/omapdrm/omap_gem.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c b/drivers/gpu/drm/omapdrm/omap_gem.c index 95dbce2..1331fd5 100644 --- a/drivers/gpu/drm/omapdrm/omap_gem.c +++ b/drivers/gpu/drm/omapdrm/omap_gem.c @@ -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; -- 2.7.4