ata_bmdma_port_start32(9)

🌸 ata_bmdma_port_start32(9) 🌸

okay bestie, welcome to the Linux Kernel API Manual page for ata_bmdma_port_start32 — yes that name is a mouthful, no I will not be pronouncing it out loud 💅

---

✨ NAME ✨

ata_bmdma_port_start32 — get a port all set up for dma. that's it, that's the whole vibe 🎀

---

✨ SYNOPSIS ✨

int ata_bmdma_port_start32 (struct ata_port *ap );

---

✨ ARGUMENTS ✨

• ap — the port we're initializing 💖

---

✨ DESCRIPTION ✨

so this one gets called just after the data structures for each port are initialized, right? and what it does is genuinely iconic: it enables 32bit PIO and allocates space for the PRD table. periodt 🫶

it may be used as the port_start entry in ata_port_operations for devices that are capable of 32bit PIO — iykyk, that's the whole point of it existing ✨

LOCKING: inherited from caller. no cap, you don't gotta do anything extra here, just whatever lock situation you already had walking in 🔒

---

✨ SEE ALSO ✨

kernel file ./drivers/ata/libata-sff.c, plus the whole friend group 👑:

• 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(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_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, the entire libata friend group showed up to the group chat, and honestly? we love that for them 😭💖

---

okay that's the whole page bestie, go forth and initialize ur ports 🦋💜

this has been your girl, signing off — brought to you by ./drivers/ata, dated October 2026, and yes the source line said the same thing twice so I'm saying it once with love 🌈✨