atiixp_bmdma_start(9)

💅 atiixp_bmdma_start — like, the DMA start callback bestie

okay so this is a page from the Kernel API Manual (atiixp_bmdma_start(9)), and honestly? it's short but it matters. let's get into it 🫶

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✨ NAME ✨

atiixp_bmdma_start — the DMA start callback. that's it, that's the vibe 💫

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🌸 SYNOPSIS 🌸

void atiixp_bmdma_start (struct ata_queued_cmd *qc );

no cap, that's the whole signature — copy it exactly, the spacing is part of the look 💅

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🎀 ARGUMENTS 🎀

• qc — the command currently in progress. she's the main character here, the command we're literally mid-way through 🧚

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🦋 DESCRIPTION 🦋

so when DMA begins, we need to make sure the UDMA control register for the channel is set correctly. that's the whole job. that's the assignment. and bestie, we are not skipping it 😭

lowkey it's a small thing but it's giving "tiny detail, huge consequences" energy — set that register right or the whole channel is gonna have a bad time 💀

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💜 NOTE 💜

the host lock held by the libata layer is what protects us from two channels both trying to set DMA bits at once. so like... the lock is the group chat admin keeping everyone from typing over each other 🙈 respect the lock, fr fr.

no lock, two channels, same bits, chaos. we don't do chaos here ✨

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👑 SEE ALSO 👑

• ./drivers/ata/pata_atiixp.c — the kernel file this whole situation lives in
• atiixp_prereset(9)
• atiixp_set_pio_timing(9)
• atiixp_set_piomode(9)
• atiixp_set_dmamode(9)
• atiixp_bmdma_stop(9) — the other half of the story, the stopping one 🛑

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and that's the page!! slay. she lives in ./drivers/ata, dated October 2026, and yeah — that's genuinely the whole footer. obsessed with the brevity honestly. periodt 🎀💖

atiixp_bmdma_start(9) — mwah 💋