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DRM_GEM_CREATE_MMAP_(9) DRM Core DRM_GEM_CREATE_MMAP_(9)

NAME

drm_gem_create_mmap_offset_size - create a fake mmap offset for an object

SYNOPSIS

int drm_gem_create_mmap_offset_size(struct drm_gem_object * obj, size_t size);

ARGUMENTS

obj
obj in question
size
the virtual size

DESCRIPTION

GEM memory mapping works by handing back to userspace a fake mmap offset it can use in a subsequent mmap(2) call. The DRM core code then looks up the object based on the offset and sets up the various memory mapping structures.
This routine allocates and attaches a fake offset for obj, in cases where the virtual size differs from the physical size (ie. obj->size). Otherwise just use drm_gem_create_mmap_offset.

AUTHORS

Jesse Barnes <jesse.barnes@intel.com>
 
Intel Corporation,
Initial version
Laurent Pinchart <laurent.pinchart@ideasonboard.com>
 
Ideas on board SPRL,
Driver internals
Daniel Vetter <daniel.vetter@ffwll.ch>
 
Intel Corporation,
Contributions all over the place

COPYRIGHT

May 2018 Kernel Hackers Manual 3.16