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 8a7f7f624SMasahiro Yamada 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 25a7f7f624SMasahiro Yamada 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 38725553d2SArnd Bergmann depends on MMU 39fbb0de79SGerd Hoffmann help 40fbb0de79SGerd Hoffmann A driver to let userspace turn memfd regions into dma-bufs. 41fbb0de79SGerd Hoffmann Qemu can use this to create host dmabufs for guest framebuffers. 42fbb0de79SGerd Hoffmann 4384335675SDaniel Vetterconfig DMABUF_DEBUG 4484335675SDaniel Vetter bool "DMA-BUF debug checks" 45cca62758SGeert Uytterhoeven depends on DMA_SHARED_BUFFER 46*143755bdSKarl Mehltretter default y if DEBUG_KERNEL 4784335675SDaniel Vetter help 4884335675SDaniel Vetter This option enables additional checks for DMA-BUF importers and 4984335675SDaniel Vetter exporters. Specifically it validates that importers do not peek at the 5084335675SDaniel Vetter underlying struct page when they import a buffer. 5184335675SDaniel Vetter 5215b9bde7SJason Gunthorpeconfig DMABUF_KUNIT_TEST 5315b9bde7SJason Gunthorpe tristate "KUnit tests for DMA-BUF" if !KUNIT_ALL_TESTS 5415b9bde7SJason Gunthorpe depends on KUNIT 5515b9bde7SJason Gunthorpe select DMA_SHARED_BUFFER 5615b9bde7SJason Gunthorpe default KUNIT_ALL_TESTS 5715b9bde7SJason Gunthorpe help 5815b9bde7SJason Gunthorpe Enable kunit tests for DMA-BUF 5915b9bde7SJason Gunthorpe 60c02a81fbSAndrew F. Davismenuconfig DMABUF_HEAPS 61c02a81fbSAndrew F. Davis bool "DMA-BUF Userland Memory Heaps" 62c02a81fbSAndrew F. Davis select DMA_SHARED_BUFFER 63c02a81fbSAndrew F. Davis help 64c02a81fbSAndrew F. Davis Choose this option to enable the DMA-BUF userland memory heaps. 65c02a81fbSAndrew F. Davis This options creates per heap chardevs in /dev/dma_heap/ which 66c02a81fbSAndrew F. Davis allows userspace to allocate dma-bufs that can be shared 67c02a81fbSAndrew F. Davis between drivers. 68c02a81fbSAndrew F. Davis 69efa04fefSJohn Stultzsource "drivers/dma-buf/heaps/Kconfig" 70efa04fefSJohn Stultz 7162304fb1SGustavo Padovanendmenu 72