ata_bmdma_fill_sg(9)

💅 ata_bmdma_fill_sg(9) — like, the Kernel API Manual page, bestie ✨

okay so bestie, gather round 🫶 we're in the Kernel API Manual today and the main character is ata_bmdma_fill_sg(9). she's lowkey a legend and nobody talks about her, so let's fix that 💖

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🌸 NAME 🌸

ata_bmdma_fill_sg — fill the PCI IDE PRD table ✨

Like, the whole entire job. That's it. That's her. 🎀

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🦋 SYNOPSIS 🦋

void ata_bmdma_fill_sg (struct ata_queued_cmd *qc );

no cap, that's the signature, copy it exactly, don't be cute with it 💅

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🍓 ARGUMENTS 🍓

• qc — the metadata that's associated with the taskfile that's about to be transferred. it's giving "everything you need to know about the command" energy 👑

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🔥 DESCRIPTION 🔥

So what she actually does: she fills the PCI IDE PRD (that's scatter-gather, iykyk) table with the segments that are associated with the current disk command 🫶

That's the vibe. Segments in, PRD table filled, slay 💅

LOCKING: spin_lock_irqsave(host lock) — fr fr, that's the locking rule, do not skip it, this is not a drill 😭

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💀 SEE ALSO 💀

Kernel file ./drivers/ata/libata-sff.c — and honestly, the whole friend group is here, look at them all 🌈

• ata_sff_check_status(9), ata_sff_altstatus(9), ata_sff_irq_status(9), ata_sff_sync(9), ata_sff_pause(9), ata_sff_dma_pause(9), ata_sff_wait_ready(9), ata_sff_set_devctl(9), ata_sff_dev_select(9), ata_dev_select(9)
• ata_sff_irq_on(9), ata_sff_tf_load(9), ata_sff_tf_read(9), ata_sff_exec_command(9), ata_tf_to_host(9), ata_sff_data_xfer(9), ata_sff_data_xfer32(9)
• ata_pio_sector(9), ata_pio_sectors(9), atapi_send_cdb(9), __atapi_pio_bytes(9), atapi_pio_bytes(9)
• ata_hsm_ok_in_wq(9), ata_hsm_qc_complete(9), ata_sff_hsm_move(9), ata_sff_qc_issue(9), ata_sff_qc_fill_rtf(9)
• ata_sff_port_intr(9), ata_sff_interrupt(9), ata_sff_lost_interrupt(9), ata_sff_freeze(9), ata_sff_thaw(9), ata_sff_prereset(9), ata_devchk(9), ata_sff_dev_classify(9)
• ata_sff_wait_after_reset(9), ata_sff_softreset(9), sata_sff_hardreset(9), ata_sff_postreset(9), ata_sff_drain_fifo(9), ata_sff_error_handler(9), ata_sff_std_ports(9)
• ata_pci_sff_init_host(9), ata_pci_sff_prepare_host(9), ata_pci_sff_activate_host(9), ata_pci_sff_init_one(9)
• ata_bmdma_fill_sg_dumb(9), ata_bmdma_qc_prep(9), ata_bmdma_dumb_qc_prep(9), ata_bmdma_qc_issue(9), ata_bmdma_port_intr(9), ata_bmdma_interrupt(9)
• ata_bmdma_error_handler(9), ata_bmdma_post_internal_cmd(9), ata_bmdma_irq_clear(9), ata_bmdma_setup(9), ata_bmdma_start(9), ata_bmdma_stop(9), ata_bmdma_status(9)
• ata_bmdma_port_start(9), ata_bmdma_port_start32(9), ata_pci_bmdma_clear_simplex(9), ata_pci_bmdma_init(9), ata_pci_bmdma_prepare_host(9), ata_pci_bmdma_init_one(9), ata_sff_port_init(9)

like, that's the whole group chat, nobody got left on read 💜

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and that's the page!! sourced straight outta ./drivers/ata, dated October 2026, manual section 9, and yeah it's still called ata_bmdma_fill_sg(9) — iconic, no notes 👑✨ bye bestie, go fill those PRD tables 🎀