projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| ec8f24b7 | 1 | # SPDX-License-Identifier: GPL-2.0-only |
| 62304fb1 GP |
2 | menu "DMABUF options" |
| 3 | ||
| 4 | config SYNC_FILE | |
| 31954660 | 5 | bool "Explicit Synchronization Framework" |
| 62304fb1 | 6 | default n |
| 62304fb1 | 7 | select DMA_SHARED_BUFFER |
| a7f7f624 | 8 | help |
| 3e8a3844 | 9 | The Sync File Framework adds explicit synchronization via |
| f54d1867 | 10 | userspace. It enables send/receive 'struct dma_fence' objects to/from |
| 31954660 GP |
11 | userspace via Sync File fds for synchronization between drivers via |
| 12 | userspace components. It has been ported from Android. | |
| 13 | ||
| 14 | The first and main user for this is graphics in which a fence is | |
| 15 | associated with a buffer. When a job is submitted to the GPU a fence | |
| 16 | is attached to the buffer and is transferred via userspace, using Sync | |
| 17 | Files fds, to the DRM driver for example. More details at | |
| baa293e9 | 18 | Documentation/driver-api/sync_file.rst. |
| 31954660 | 19 | |
| 35538d78 GP |
20 | config SW_SYNC |
| 21 | bool "Sync File Validation Framework" | |
| 22 | default n | |
| 23 | depends on SYNC_FILE | |
| 24 | depends on DEBUG_FS | |
| a7f7f624 | 25 | help |
| 35538d78 GP |
26 | A sync object driver that uses a 32bit counter to coordinate |
| 27 | synchronization. Useful when there is no hardware primitive backing | |
| 28 | the synchronization. | |
| 29 | ||
| 30 | WARNING: improper use of this can result in deadlocking kernel | |
| 31 | drivers from userspace. Intended for test and debug only. | |
| 32 | ||
| fbb0de79 GH |
33 | config UDMABUF |
| 34 | bool "userspace dmabuf misc driver" | |
| 35 | default n | |
| 36 | depends on DMA_SHARED_BUFFER | |
| 68d2f70e | 37 | depends on MEMFD_CREATE || COMPILE_TEST |
| fbb0de79 GH |
38 | help |
| 39 | A driver to let userspace turn memfd regions into dma-bufs. | |
| 40 | Qemu can use this to create host dmabufs for guest framebuffers. | |
| 41 | ||
| bb42df46 CK |
42 | config DMABUF_MOVE_NOTIFY |
| 43 | bool "Move notify between drivers (EXPERIMENTAL)" | |
| 44 | default n | |
| c4f3a346 | 45 | depends on DMA_SHARED_BUFFER |
| bb42df46 | 46 | help |
| 518110cd GU |
47 | Don't pin buffers if the dynamic DMA-buf interface is available on |
| 48 | both the exporter as well as the importer. This fixes a security | |
| 49 | problem where userspace is able to pin unrestricted amounts of memory | |
| 50 | through DMA-buf. | |
| 51 | This is marked experimental because we don't yet have a consistent | |
| 52 | execution context and memory management between drivers. | |
| bb42df46 | 53 | |
| 84335675 DV |
54 | config DMABUF_DEBUG |
| 55 | bool "DMA-BUF debug checks" | |
| cca62758 | 56 | depends on DMA_SHARED_BUFFER |
| 84335675 DV |
57 | default y if DMA_API_DEBUG |
| 58 | help | |
| 59 | This option enables additional checks for DMA-BUF importers and | |
| 60 | exporters. Specifically it validates that importers do not peek at the | |
| 61 | underlying struct page when they import a buffer. | |
| 62 | ||
| 9536b64a CW |
63 | config DMABUF_SELFTESTS |
| 64 | tristate "Selftests for the dma-buf interfaces" | |
| 65 | default n | |
| 66 | depends on DMA_SHARED_BUFFER | |
| 67 | ||
| c02a81fb AD |
68 | menuconfig DMABUF_HEAPS |
| 69 | bool "DMA-BUF Userland Memory Heaps" | |
| 70 | select DMA_SHARED_BUFFER | |
| 71 | help | |
| 72 | Choose this option to enable the DMA-BUF userland memory heaps. | |
| 73 | This options creates per heap chardevs in /dev/dma_heap/ which | |
| 74 | allows userspace to allocate dma-bufs that can be shared | |
| 75 | between drivers. | |
| 76 | ||
| bdb8d06d | 77 | menuconfig DMABUF_SYSFS_STATS |
| e0a9f1fe | 78 | bool "DMA-BUF sysfs statistics (DEPRECATED)" |
| 87fd9ef4 | 79 | depends on DMA_SHARED_BUFFER |
| bdb8d06d HV |
80 | help |
| 81 | Choose this option to enable DMA-BUF sysfs statistics | |
| 82 | in location /sys/kernel/dmabuf/buffers. | |
| 83 | ||
| 84 | /sys/kernel/dmabuf/buffers/<inode_number> will contain | |
| 85 | statistics for the DMA-BUF with the unique inode number | |
| 86 | <inode_number>. | |
| 87 | ||
| e0a9f1fe CK |
88 | This option is deprecated and should sooner or later be removed. |
| 89 | Android is the only user of this and it turned out that this resulted | |
| 90 | in quite some performance problems. | |
| 91 | ||
| efa04fef JS |
92 | source "drivers/dma-buf/heaps/Kconfig" |
| 93 | ||
| 62304fb1 | 94 | endmenu |