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authorDavid Herrmann <dh.herrmann@gmail.com>2014-01-03 17:24:19 +0400
committerDavid Herrmann <dh.herrmann@gmail.com>2014-03-16 15:23:33 +0400
commit6796cb16c088905bf3af40548fda68c09e6f6ee5 (patch)
treed40162f17dad7b54ac63feaf62b7c84493556f5a /drivers/gpu/drm/ast
parent31bbe16f6d88622d6731fa2cb4ab38d57d844ac1 (diff)
downloadlinux-6796cb16c088905bf3af40548fda68c09e6f6ee5.tar.xz
drm: use anon-inode instead of relying on cdevs
DRM drivers share a common address_space across all character-devices of a single DRM device. This allows simple buffer eviction and mapping-control. However, DRM core currently waits for the first ->open() on any char-dev to mark the underlying inode as backing inode of the device. This delayed initialization causes ugly conditions all over the place: if (dev->dev_mapping) do_sth(); To avoid delayed initialization and to stop reusing the inode of the char-dev, we allocate an anonymous inode for each DRM device and reset filp->f_mapping to it on ->open(). Signed-off-by: David Herrmann <dh.herrmann@gmail.com>
Diffstat (limited to 'drivers/gpu/drm/ast')
-rw-r--r--drivers/gpu/drm/ast/ast_ttm.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/gpu/drm/ast/ast_ttm.c b/drivers/gpu/drm/ast/ast_ttm.c
index 4ea9b17ac17a..2b491539e60c 100644
--- a/drivers/gpu/drm/ast/ast_ttm.c
+++ b/drivers/gpu/drm/ast/ast_ttm.c
@@ -324,7 +324,7 @@ int ast_bo_create(struct drm_device *dev, int size, int align,
}
astbo->bo.bdev = &ast->ttm.bdev;
- astbo->bo.bdev->dev_mapping = dev->dev_mapping;
+ astbo->bo.bdev->dev_mapping = dev->anon_inode->i_mapping;
ast_ttm_placement(astbo, TTM_PL_FLAG_VRAM | TTM_PL_FLAG_SYSTEM);