CONFIG_DMA_CMA: DMA Contiguous Memory Allocator

General informations

The Linux kernel configuration item CONFIG_DMA_CMA has multiple definitions:

DMA Contiguous Memory Allocator found in kernel/dma/Kconfig

The configuration item CONFIG_DMA_CMA:

• prompt: DMA Contiguous Memory Allocator
• type: bool
• depends on: CONFIG_HAVE_DMA_CONTIGUOUS && CONFIG_CMA
• defined in kernel/dma/Kconfig
• found in Linux kernels: 5.1–5.19, 6.0–6.8, 6.9-rc+HEAD

Help text

This enables the Contiguous Memory Allocator which allows drivers to allocate big physically-contiguous blocks of memory for use with hardware components that do not support I/O map nor scatter-gather.

You can disable CMA by specifying "cma=0" on the kernel's command line.

For more information see <kernel/dma/contiguous.c>. If unsure, say "n".

DMA Contiguous Memory Allocator found in drivers/base/Kconfig

The configuration item CONFIG_DMA_CMA:

• prompt: DMA Contiguous Memory Allocator
• type: bool
• depends on: CONFIG_HAVE_DMA_CONTIGUOUS && CONFIG_CMA
• defined in drivers/base/Kconfig
• found in Linux kernels: 3.12–3.19, 4.0–4.20, 5.0

Help text

This enables the Contiguous Memory Allocator which allows drivers to allocate big physically-contiguous blocks of memory for use with hardware components that do not support I/O map nor scatter-gather.

You can disable CMA by specifying "cma=0" on the kernel's command line.

For more information see <include/linux/dma-contiguous.h>. If unsure, say "n".

Hardware

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Sources

This page is automaticly generated with free (libre, open) software lkddb(see lkddb-sources).

The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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