snd_dma_alloc_dir_pages(9)

✨ snd_dma_alloc_dir_pages ✨

okay bestie, buckle up, this is a kernel API manual page (from the Kernel API Manual, no less 💅) and it's genuinely not that deep. it's snd_dma_alloc_dir_pages — say that five times fast, i dare you — and it does exactly one thing: allocates a buffer area based on the type and direction you hand it. that's the whole vibe.

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🌸 NAME 🌸

snd_dma_alloc_dir_pages — allocate the buffer area according to the given type and direction ✨

like, literally that. allocate the buffer area. according to the given type and direction. no notes.

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🎀 SYNOPSIS 🎀

int snd_dma_alloc_dir_pages (int type , struct device *device , enum
dma_data_direction dir , size_t size , struct snd_dma_buffer *dmab );

yes it's five args, yes it returns an int, yes the signature is Line Broken in the original and we're keeping it exactly that way because we don't disrespect the source material 🫶

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🦋 ARGUMENTS 🦋

• type — the DMA buffer type. it's the whole personality of the call, lowkey. it decides which kind of buffer you're getting.
• device — the device pointer. the main character of this operation, fr.
• dir — DMA direction. which way the data's flowing, iykyk.
• size — the buffer size to allocate. how much room you're asking for, in bytes obviously 😭
• dmab — buffer allocation record to store the allocated data. this is where the receipts go, bestie. it holds the result.

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🧚 DESCRIPTION 🧚

so here's the tea: it calls the memory-allocator function for the corresponding buffer type. that's it. that's the description. it's giving "does what it says on the tin" energy 👑

the type you pass in determines which allocator gets the honor of showing up, no cap. iconic delegation. slay.

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⭐ RETURN ⭐

• 0 — zero! the buffer with the given size was allocated successfully. we ate. 💅
• negative value — it errored out. not the vibe. 😭

one or the other, no in-between, periodt.

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🌈 SEE ALSO 🌈

• Kernel file ./sound/core/memalloc.c — the actual source, go read it, it's right there 🫶
• snd_dma_alloc_pages_fallback(9)
• snd_dma_free_pages(9)
• snd_devm_alloc_dir_pages(9)
• snd_dma_buffer_mmap(9)
• snd_dma_buffer_sync(9)
• snd_sgbuf_get_addr(9)
• snd_sgbuf_get_page(9)
• snd_sgbuf_get_chunk_size(9)

that's nine friends and every single one of them made the list. no one got left on read. 🌸

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ok real talk before you go: this whole page lives over in ./sound/core, and it's stamped October 2026, so it's basically from the future. the more you know. 💜

anyway, that's the page, mwah, go allocate responsibly 🎀✨🦋