1ec8f24b7SThomas Gleixner# SPDX-License-Identifier: GPL-2.0-only 262304fb1SGustavo Padovanmenu "DMABUF options" 362304fb1SGustavo Padovan 462304fb1SGustavo Padovanconfig SYNC_FILE 531954660SGustavo Padovan bool "Explicit Synchronization Framework" 662304fb1SGustavo Padovan default n 762304fb1SGustavo Padovan select DMA_SHARED_BUFFER 862304fb1SGustavo Padovan ---help--- 93e8a3844SChristophe JAILLET The Sync File Framework adds explicit synchronization via 10f54d1867SChris Wilson userspace. It enables send/receive 'struct dma_fence' objects to/from 1131954660SGustavo Padovan userspace via Sync File fds for synchronization between drivers via 1231954660SGustavo Padovan userspace components. It has been ported from Android. 1331954660SGustavo Padovan 1431954660SGustavo Padovan The first and main user for this is graphics in which a fence is 1531954660SGustavo Padovan associated with a buffer. When a job is submitted to the GPU a fence 1631954660SGustavo Padovan is attached to the buffer and is transferred via userspace, using Sync 1731954660SGustavo Padovan Files fds, to the DRM driver for example. More details at 18baa293e9SMauro Carvalho Chehab Documentation/driver-api/sync_file.rst. 1931954660SGustavo Padovan 2035538d78SGustavo Padovanconfig SW_SYNC 2135538d78SGustavo Padovan bool "Sync File Validation Framework" 2235538d78SGustavo Padovan default n 2335538d78SGustavo Padovan depends on SYNC_FILE 2435538d78SGustavo Padovan depends on DEBUG_FS 2535538d78SGustavo Padovan ---help--- 2635538d78SGustavo Padovan A sync object driver that uses a 32bit counter to coordinate 2735538d78SGustavo Padovan synchronization. Useful when there is no hardware primitive backing 2835538d78SGustavo Padovan the synchronization. 2935538d78SGustavo Padovan 3035538d78SGustavo Padovan WARNING: improper use of this can result in deadlocking kernel 3135538d78SGustavo Padovan drivers from userspace. Intended for test and debug only. 3235538d78SGustavo Padovan 33fbb0de79SGerd Hoffmannconfig UDMABUF 34fbb0de79SGerd Hoffmann bool "userspace dmabuf misc driver" 35fbb0de79SGerd Hoffmann default n 36fbb0de79SGerd Hoffmann depends on DMA_SHARED_BUFFER 3768d2f70eSGerd Hoffmann depends on MEMFD_CREATE || COMPILE_TEST 38fbb0de79SGerd Hoffmann help 39fbb0de79SGerd Hoffmann A driver to let userspace turn memfd regions into dma-bufs. 40fbb0de79SGerd Hoffmann Qemu can use this to create host dmabufs for guest framebuffers. 41fbb0de79SGerd Hoffmann 42*bb42df46SChristian Königconfig DMABUF_MOVE_NOTIFY 43*bb42df46SChristian König bool "Move notify between drivers (EXPERIMENTAL)" 44*bb42df46SChristian König default n 45*bb42df46SChristian König help 46*bb42df46SChristian König Don''t pin buffers if the dynamic DMA-buf interface is available on both the 47*bb42df46SChristian König exporter as well as the importer. This fixes a security problem where 48*bb42df46SChristian König userspace is able to pin unrestricted amounts of memory through DMA-buf. 49*bb42df46SChristian König But marked experimental because we don''t jet have a consistent execution 50*bb42df46SChristian König context and memory management between drivers. 51*bb42df46SChristian König 529536b64aSChris Wilsonconfig DMABUF_SELFTESTS 539536b64aSChris Wilson tristate "Selftests for the dma-buf interfaces" 549536b64aSChris Wilson default n 559536b64aSChris Wilson depends on DMA_SHARED_BUFFER 569536b64aSChris Wilson 57c02a81fbSAndrew F. Davismenuconfig DMABUF_HEAPS 58c02a81fbSAndrew F. Davis bool "DMA-BUF Userland Memory Heaps" 59c02a81fbSAndrew F. Davis select DMA_SHARED_BUFFER 60c02a81fbSAndrew F. Davis help 61c02a81fbSAndrew F. Davis Choose this option to enable the DMA-BUF userland memory heaps. 62c02a81fbSAndrew F. Davis This options creates per heap chardevs in /dev/dma_heap/ which 63c02a81fbSAndrew F. Davis allows userspace to allocate dma-bufs that can be shared 64c02a81fbSAndrew F. Davis between drivers. 65c02a81fbSAndrew F. Davis 66efa04fefSJohn Stultzsource "drivers/dma-buf/heaps/Kconfig" 67efa04fefSJohn Stultz 6862304fb1SGustavo Padovanendmenu 69