From: Ankitprasad Sharma <ankitprasad.r.sharma@xxxxxxxxx> When constructing a batchbuffer, it is sometimes crucial to know the largest hole into which we can fit a fenceable buffer (for example when handling very large objects on gen2 and gen3). This depends on the fragmentation of pinned buffers inside the aperture, a question only the kernel can easily answer. This set of patches extends the current DRM_I915_GEM_GET_APERTURE ioctl to include a couple of new fields in its reply to userspace - the total amount of space available in the mappable region of the aperture and also the single largest block available. This is not quite what userspace wants to answer the question of whether this batch will fit as fences are also required to meet severe alignment constraints within the batch. For this purpose, a third conservative estimate of largest fence available is also provided. For when userspace needs more than one batch, we also provide the culmulative space available for fences such that it has some additional guidance to how much space it could allocate to fences. Conservatism still wins. The patches also support for getting total size and available size of the stolen region as well as single largest block available in the stolen region. It also adds a debugfs file for convenient testing and reporting. v2: Rebased to the latest drm-intel-nightly Ankitprasad Sharma (1): drm/i915: Extend GET_APERTURE ioctl to report size of the stolen region Rodrigo Vivi (1): drm/i915: Extend GET_APERTURE ioctl to report available map space drivers/gpu/drm/i915/i915_debugfs.c | 33 +++++++++ drivers/gpu/drm/i915/i915_drv.h | 3 + drivers/gpu/drm/i915/i915_gem.c | 123 +++++++++++++++++++++++++++++++-- drivers/gpu/drm/i915/i915_gem_stolen.c | 35 ++++++++++ include/uapi/drm/i915_drm.h | 40 +++++++++++ 5 files changed, 230 insertions(+), 4 deletions(-) -- 1.9.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx