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Add flags field to struct dma_buf_attachment as a means of metadata sharing for DMA-BUF exporter and importer. DMABUF_ATTACH_FLAG_LMEM is defined, acting as an indicator of buffer residing in local memory of a discrete GPU. Add importer_type_id to struct dma_buf. This allows the exporter to recognize the importer and respond properly accordingly. Currently, the only added id is for virtio-GPU. Tracked-On: No Signed-off-by: Weifeng Liu <weifeng.liu@intel.com>
Leverage the new fields in dmabuf attachment to obtained information about the imported buffers. In atomic check, we must return an error when the user space is trying to present a framebuffer in system memory (without DMABUF_ATTACH_FLAG_LMEM being set) on discrete GPU backing display. Tracked-On: No Signed-off-by: manxiaoliang <xiaoliangx.man@intel.com>
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