ntb_get_dma_dev(9)

💅 ntb_get_dma_dev(9) — the Kernel API Manual glow-up

okay so bestie, welcome to ntb_get_dma_dev(9), straight out of the Kernel API Manual ✨ this one's short, sweet, and honestly kinda iconic for how much it just handles for you.

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🌸 NAME 🌸

ntb_get_dma_dev — grab the device you should be using for DMA allocations/mappings 💖

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✨ SYNOPSIS ✨

struct device * ntb_get_dma_dev (struct ntb_dev *ntb );

like, that's the whole signature. so clean. so demure. 🎀

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🫶 ARGUMENTS 🫶

• ntb — the NTB device context. that's your main character right there 👑

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💅 DESCRIPTION 💅

so this returns a struct device that's suitable for DMA API allocations and mappings. ngl that's the whole vibe ✨

most of the time it's just the parent of the NTB device — like, the obvious answer, no drama — but a driver can override it by implementing .get_dma_dev. lowkey customisation, highkey useful 🦋

⚠️ real talk though: drivers that implement .get_dma_dev must return a non-NULL pointer. no NULLs. not the move. not today. periodt 💀

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⭐ RETURN ⭐

a device pointer to use for DMA operations 🫡 go forth and allocate, bestie.

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🌈 SEE ALSO 🌈

sooo everything lives in the kernel file ./include/linux/ntb.h, and honestly the whole NTB extended universe shows up here. it's giving family reunion 🎉

• enum ntb_topo(9)
• enum ntb_speed(9)
• enum ntb_width(9)
• enum ntb_default_port(9)
• struct ntb_client_ops(9)
• struct ntb_ctx_ops(9)
• struct ntb_dev_ops(9)
• struct ntb_client(9)
• struct ntb_dev(9)
• ntb_register_client(9)
• ntb_unregister_client(9)
• ntb_register_device(9)
• ntb_unregister_device(9)
• ntb_set_ctx(9)
• ntb_clear_ctx(9)
• ntb_link_event(9)
• ntb_db_event(9)
• ntb_msg_event(9)
• ntb_default_port_number(9)
• ntb_default_peer_port_count(9)
• ntb_default_peer_port_number(9)
• ntb_default_peer_port_idx(9)
• ntb_port_number(9)
• ntb_peer_port_count(9)
• ntb_peer_port_number(9)
• ntb_logical_port_number(9)
• ntb_peer_logical_port_number(9)
• ntb_peer_port_idx(9)
• ntb_link_is_up(9)
• ntb_link_enable(9)
• ntb_link_disable(9)
• ntb_mw_count(9)
• ntb_mw_get_align(9)
• ntb_mw_set_trans(9)
• ntb_mw_clear_trans(9)
• ntb_peer_mw_count(9)
• ntb_peer_mw_get_addr(9)
• ntb_peer_mw_set_trans(9)
• ntb_peer_mw_clear_trans(9)
• ntb_db_is_unsafe(9)
• ntb_db_valid_mask(9)
• ntb_db_vector_count(9)
• ntb_db_vector_mask(9)
• ntb_db_read(9)
• ntb_db_set(9)
• ntb_db_clear(9)
• ntb_db_read_mask(9)
• ntb_db_set_mask(9)
• ntb_db_clear_mask(9)
• ntb_peer_db_addr(9)
• ntb_peer_db_read(9)
• ntb_peer_db_set(9)
• ntb_peer_db_clear(9)
• ntb_peer_db_read_mask(9)
• ntb_peer_db_set_mask(9)
• ntb_peer_db_clear_mask(9)
• ntb_spad_is_unsafe(9)
• ntb_spad_count(9)
• ntb_spad_read(9)
• ntb_spad_write(9)
• ntb_peer_spad_addr(9)
• ntb_peer_spad_read(9)
• ntb_peer_spad_write(9)
• ntb_msg_count(9)
• ntb_msg_inbits(9)
• ntb_msg_outbits(9)
• ntb_msg_read_sts(9)
• ntb_msg_clear_sts(9)
• ntb_msg_set_mask(9)
• ntb_msg_clear_mask(9)
• ntb_msg_read(9)
• ntb_peer_msg_write(9)
• ntb_peer_resource_idx(9)
• ntb_peer_highest_mw_idx(9)

like… yes. all of them. every single one. iykyk 🧚

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okay that's the whole page bestie 🫶 this cutie lives in ./include/linux, dated October 2026, and it answers to the name ntb_get_dma_dev(9). go get your DMA on. slay. 💜