CONFIG_DMA_API_DEBUG: Enable debugging of DMA-API usage

General informations

The Linux kernel configuration item CONFIG_DMA_API_DEBUG has multiple definitions:

Enable debugging of DMA-API usage found in kernel/dma/Kconfig

The configuration item CONFIG_DMA_API_DEBUG:

• prompt: Enable debugging of DMA-API usage
• type: bool
• depends on: (none)
• defined in kernel/dma/Kconfig
• found in Linux kernels: 5.1–5.19, 6.0–6.12

Help text

Enable this option to debug the use of the DMA API by device drivers. With this option you will be able to detect common bugs in device drivers like double-freeing of DMA mappings or freeing mappings that were never allocated.

This option causes a performance degradation. Use only if you want to debug device drivers and dma interactions.

If unsure, say N.

Enable debugging of DMA-API usage found in lib/Kconfig.debug

The configuration item CONFIG_DMA_API_DEBUG:

• prompt: Enable debugging of DMA-API usage
• type: bool
• depends on: (none)
• defined in lib/Kconfig.debug
• found in Linux kernels: 2.6.30–2.6.39, 3.0–3.19, 4.0–4.20, 5.0

Help text

Enable this option to debug the use of the DMA API by device drivers. With this option you will be able to detect common bugs in device drivers like double-freeing of DMA mappings or freeing mappings that were never allocated.

This also attempts to catch cases where a page owned by DMA is accessed by the cpu in a way that could cause data corruption. For example, this enables cow_user_page() to check that the source page is not undergoing DMA.

This option causes a performance degradation. Use only if you want to debug device drivers and dma interactions.

If unsure, say N.

Hardware

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The data is retrived from:

• Linux kernel
• Linux Kernel Driver DataBase (LKDDb)

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