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18d7de823b
Currently vmap_udmabuf set page's array by each folio.
But, ubuf->folios is only contain's the folio's head page.
That mean we repeatedly mapped the folio head page to the vmalloc area.
Due to udmabuf can use hugetlb, if HVO enabled, tail page may not exist,
so, we can't use page array to map, instead, use pfn array.
By this, we removed page usage in udmabuf totally.
Fixes: 5e72b2b41a ("udmabuf: convert udmabuf driver to use folios")
Suggested-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Signed-off-by: Huan Yang <link@vivo.com>
Acked-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240918025238.2957823-4-link@vivo.com
97 lines
3.2 KiB
Plaintext
97 lines
3.2 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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menu "DMABUF options"
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config SYNC_FILE
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bool "Explicit Synchronization Framework"
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default n
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select DMA_SHARED_BUFFER
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help
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The Sync File Framework adds explicit synchronization via
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userspace. It enables send/receive 'struct dma_fence' objects to/from
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userspace via Sync File fds for synchronization between drivers via
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userspace components. It has been ported from Android.
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The first and main user for this is graphics in which a fence is
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associated with a buffer. When a job is submitted to the GPU a fence
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is attached to the buffer and is transferred via userspace, using Sync
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Files fds, to the DRM driver for example. More details at
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Documentation/driver-api/sync_file.rst.
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config SW_SYNC
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bool "Sync File Validation Framework"
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default n
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depends on SYNC_FILE
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depends on DEBUG_FS
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help
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A sync object driver that uses a 32bit counter to coordinate
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synchronization. Useful when there is no hardware primitive backing
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the synchronization.
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WARNING: improper use of this can result in deadlocking kernel
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drivers from userspace. Intended for test and debug only.
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config UDMABUF
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bool "userspace dmabuf misc driver"
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default n
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depends on DMA_SHARED_BUFFER
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depends on MEMFD_CREATE || COMPILE_TEST
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depends on MMU
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select VMAP_PFN
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help
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A driver to let userspace turn memfd regions into dma-bufs.
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Qemu can use this to create host dmabufs for guest framebuffers.
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config DMABUF_MOVE_NOTIFY
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bool "Move notify between drivers (EXPERIMENTAL)"
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default n
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depends on DMA_SHARED_BUFFER
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help
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Don't pin buffers if the dynamic DMA-buf interface is available on
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both the exporter as well as the importer. This fixes a security
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problem where userspace is able to pin unrestricted amounts of memory
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through DMA-buf.
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This is marked experimental because we don't yet have a consistent
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execution context and memory management between drivers.
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config DMABUF_DEBUG
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bool "DMA-BUF debug checks"
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depends on DMA_SHARED_BUFFER
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default y if DMA_API_DEBUG
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help
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This option enables additional checks for DMA-BUF importers and
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exporters. Specifically it validates that importers do not peek at the
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underlying struct page when they import a buffer.
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config DMABUF_SELFTESTS
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tristate "Selftests for the dma-buf interfaces"
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default n
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depends on DMA_SHARED_BUFFER
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menuconfig DMABUF_HEAPS
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bool "DMA-BUF Userland Memory Heaps"
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select DMA_SHARED_BUFFER
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help
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Choose this option to enable the DMA-BUF userland memory heaps.
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This options creates per heap chardevs in /dev/dma_heap/ which
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allows userspace to allocate dma-bufs that can be shared
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between drivers.
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menuconfig DMABUF_SYSFS_STATS
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bool "DMA-BUF sysfs statistics (DEPRECATED)"
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depends on DMA_SHARED_BUFFER
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help
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Choose this option to enable DMA-BUF sysfs statistics
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in location /sys/kernel/dmabuf/buffers.
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/sys/kernel/dmabuf/buffers/<inode_number> will contain
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statistics for the DMA-BUF with the unique inode number
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<inode_number>.
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This option is deprecated and should sooner or later be removed.
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Android is the only user of this and it turned out that this resulted
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in quite some performance problems.
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source "drivers/dma-buf/heaps/Kconfig"
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endmenu
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