dma_buf_attach_revocable(9)

💅 dma_buf_attach_revocable(9) — the vibe check for revoke semantics

okay so this is a page from the Kernel API Manual, and bestie, it's a short one but it's important, so stay with me 🫶

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✨ NAME ✨

dma_buf_attach_revocable — check if a DMA-buf importer implements revoke semantics.

Like, literally just a yes/no vibe check on your importer. That's the whole job. Slay. 💅

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🌸 SYNOPSIS 🌸

bool dma_buf_attach_revocable (struct dma_buf_attachment *attach );

Returns a bool, takes one pointer, zero drama. 🎀

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🦋 ARGUMENTS 🦋

• attach — the DMA-buf attachment to check 👀 that's it, that's the whole argument list, she's low maintenance.

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💖 DESCRIPTION 💖

So the function returns true if the DMA-buf importer can support the revoke sequence explained in dma_buf_invalidate_mappings within bounded time. Bounded time is the main character here — no infinite hangs, no "it'll get there eventually", none of that. ⏳

And what does that actually mean? It means the importer implements invalidate_mappings and ensures that unmap is called as a result. Both things. Not one. Both. No cap. 🔥

fr fr, if your importer can't do the revoke dance in bounded time, this returns something other than true — and honestly you should respect it for being honest with you 😭

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👑 SEE ALSO 👑

Grab a snack, this list is long, but every single one of these is iconic in her own right 🍓:

• The kernel file ./drivers/dma-buf/dma-buf.c — the mothership, the source of truth, the whole entire house 🏠
• dma_buf_iter_begin(9)
• dma_buf_iter_next(9)
• implicit fence polling(9)
• dma_buf_set_name(9)
• dma buf device access(9)
• dma_buf_export(9)
• dma_buf_fd(9)
• dma_buf_fd_install(9)
• dma_buf_get(9)
• dma_buf_put(9)
• locking convention(9)
• dma_buf_dynamic_attach(9)
• dma_buf_attach(9)
• dma_buf_detach(9)
• dma_buf_pin(9)
• dma_buf_unpin(9)
• dma_buf_map_attachment(9)
• dma_buf_map_attachment_unlocked(9)
• dma_buf_unmap_attachment(9)
• dma_buf_unmap_attachment_unlocked(9)
• dma_buf_invalidate_mappings(9) — the one this whole page is spiritually about, go read it, it's giving lore ✨
• cpu access(9)
• dma_buf_begin_cpu_access(9)
• dma_buf_end_cpu_access(9)
• dma_buf_mmap(9)
• dma_buf_vmap(9)
• dma_buf_vmap_unlocked(9)
• dma_buf_vunmap(9)
• dma_buf_vunmap_unlocked(9)

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and that's the page, bestie 💜

this icon lives in ./drivers/dma-buf, dated October 2026, and yes, dma_buf_attach_revocable(9) is her full government name 🎀✨ go forth and check your revoke semantics, ily 🫶