snd_devm_alloc_dir_pages(9)

🌸 snd_devm_alloc_dir_pages(9) 🌸

okay so this is a page straight out of the Kernel API Manual, and we're about to make devres buffer allocation make sense, bestie. no cap. ✨

🎀 NAME 🎀

snd_devm_alloc_dir_pages — allocate the buffer and manage with devres. it's giving "let devres handle the cleanup" energy, fr fr. 💅

✨ SYNOPSIS ✨

struct snd_dma_buffer * snd_devm_alloc_dir_pages (struct device *dev ,
int type , enum dma_data_direction dir , size_t size );

🫶 ARGUMENTS 🫶

• dev — the device pointer. like, the real device pointer, bestie.
• type — the DMA buffer type. pick your type, iconic.
• dir — DMA direction. directional vibes.
• size — the buffer size to allocate. how much space we're giving it.

🦋 DESCRIPTION 🦋

okay so it allocates buffer pages depending on the given type, and manages them using devres. the pages will be released automatically at the device removal. periodt. 💖

Unlike snd_dma_alloc_pages, this function requires the real device pointer, hence it can't work with SNDRV_DMA_TYPE_CONTINUOUS or SNDRV_DMA_TYPE_VMALLOC type. so don't try it with those, bestie — it literally can't. 😭

vibe check: no SNDRV_DMA_TYPE_CONTINUOUS, no SNDRV_DMA_TYPE_VMALLOC. this one needs the real device pointer. iykyk 🌈

⭐ RETURN ⭐

on success you get the snd_dma_buffer object, or NULL if failed. that's the whole mood. 🫶

🌟 SEE ALSO 🌟

the kernel file is ./sound/core/memalloc.c, and the related besties are:

• snd_dma_alloc_dir_pages(9)
• snd_dma_alloc_pages_fallback(9)
• snd_dma_free_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)

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that's the whole page, bestie! shoutout to the source at ./sound/core, dated October 2026, for snd_devm_alloc_dir_pages(9). slay and read the docs responsibly 💅✨