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 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 42bb42df46SChristian Königconfig DMABUF_MOVE_NOTIFY 43bb42df46SChristian König bool "Move notify between drivers (EXPERIMENTAL)" 44bb42df46SChristian König default n 45c4f3a346SGeert Uytterhoeven depends on DMA_SHARED_BUFFER 46bb42df46SChristian König help 47518110cdSGeert Uytterhoeven Don't pin buffers if the dynamic DMA-buf interface is available on 48518110cdSGeert Uytterhoeven both the exporter as well as the importer. This fixes a security 49518110cdSGeert Uytterhoeven problem where userspace is able to pin unrestricted amounts of memory 50518110cdSGeert Uytterhoeven through DMA-buf. 51518110cdSGeert Uytterhoeven This is marked experimental because we don't yet have a consistent 52518110cdSGeert Uytterhoeven execution context and memory management between drivers. 53bb42df46SChristian König 5484335675SDaniel Vetterconfig DMABUF_DEBUG 5584335675SDaniel Vetter bool "DMA-BUF debug checks" 56cca62758SGeert Uytterhoeven depends on DMA_SHARED_BUFFER 5784335675SDaniel Vetter default y if DMA_API_DEBUG 5884335675SDaniel Vetter help 5984335675SDaniel Vetter This option enables additional checks for DMA-BUF importers and 6084335675SDaniel Vetter exporters. Specifically it validates that importers do not peek at the 6184335675SDaniel Vetter underlying struct page when they import a buffer. 6284335675SDaniel Vetter 639536b64aSChris Wilsonconfig DMABUF_SELFTESTS 649536b64aSChris Wilson tristate "Selftests for the dma-buf interfaces" 659536b64aSChris Wilson default n 669536b64aSChris Wilson depends on DMA_SHARED_BUFFER 679536b64aSChris Wilson 68c02a81fbSAndrew F. Davismenuconfig DMABUF_HEAPS 69c02a81fbSAndrew F. Davis bool "DMA-BUF Userland Memory Heaps" 70c02a81fbSAndrew F. Davis select DMA_SHARED_BUFFER 71c02a81fbSAndrew F. Davis help 72c02a81fbSAndrew F. Davis Choose this option to enable the DMA-BUF userland memory heaps. 73c02a81fbSAndrew F. Davis This options creates per heap chardevs in /dev/dma_heap/ which 74c02a81fbSAndrew F. Davis allows userspace to allocate dma-bufs that can be shared 75c02a81fbSAndrew F. Davis between drivers. 76c02a81fbSAndrew F. Davis 77bdb8d06dSHridya Valsarajumenuconfig DMABUF_SYSFS_STATS 78*e0a9f1feSChristian König bool "DMA-BUF sysfs statistics (DEPRECATED)" 7987fd9ef4SGeert Uytterhoeven depends on DMA_SHARED_BUFFER 80bdb8d06dSHridya Valsaraju help 81bdb8d06dSHridya Valsaraju Choose this option to enable DMA-BUF sysfs statistics 82bdb8d06dSHridya Valsaraju in location /sys/kernel/dmabuf/buffers. 83bdb8d06dSHridya Valsaraju 84bdb8d06dSHridya Valsaraju /sys/kernel/dmabuf/buffers/<inode_number> will contain 85bdb8d06dSHridya Valsaraju statistics for the DMA-BUF with the unique inode number 86bdb8d06dSHridya Valsaraju <inode_number>. 87bdb8d06dSHridya Valsaraju 88*e0a9f1feSChristian König This option is deprecated and should sooner or later be removed. 89*e0a9f1feSChristian König Android is the only user of this and it turned out that this resulted 90*e0a9f1feSChristian König in quite some performance problems. 91*e0a9f1feSChristian König 92efa04fefSJohn Stultzsource "drivers/dma-buf/heaps/Kconfig" 93efa04fefSJohn Stultz 9462304fb1SGustavo Padovanendmenu 95