ata_id_xfermask(9)

💅 ata_id_xfermask 💅

okay so bestie, welcome to the Kernel API Manual — yes, that manual — and today's main character is ata_id_xfermask(9). she's a tiny libata function with a big job and honestly? she ate. let's get into it 🎀

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✨ NAME ✨

ata_id_xfermask — literally just: compute the xfermask from the given IDENTIFY data. that's the whole vibe. no cap. 🦋

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🧚 SYNOPSIS 🧚

unsigned int ata_id_xfermask (const u16 *id );

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🌸 ARGUMENTS 🌸

• id — the IDENTIFY data you're computing the xfer mask from. that's it, that's the argument. give her the data and she'll do her thing 💖

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🔥 DESCRIPTION 🔥

okay so the whole point: compute the xfermask for this device. sounds simple right? wrong. this is not as trivial as it seems if we have to consider early devices correctly — the elderly hardware needs respect too, and she's not about to be sloppy about it 😭

FIXME: pre IDE drive timing (do we care ?). bestie is asking a genuine question here, not being shady. the note is in the source, so it lives here too 🙈

LOCKING: None. no locks, no drama, she's just built different. 💀

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👑 RETURN 👑

the computed xfermask. that's what you get back. that's the tea ⭐

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🌈 SEE ALSO 🌈

oh you thought this was gonna be a short list? think again 💅 the kernel file itself lives at ./drivers/ata/libata-core.c, and here is the entire libata friend group, in the exact order they showed up to the party:

ata_link_next(9), ata_dev_next(9), ata_dev_phys_link(9), ata_force_cbl(9), ata_force_pflags(9), ata_force_link_limits(9), ata_force_xfermask(9), ata_force_quirks(9), atapi_cmd_type(9), ata_set_rwcmd_protocol(9), ata_tf_read_block(9), ata_build_rw_tf(9), ata_pack_xfermask(9), ata_unpack_xfermask(9), ata_xfer_mask2mode(9), ata_xfer_mode2mask(9), ata_xfer_mode2shift(9), ata_mode_string(9), ata_dev_classify(9), ata_id_string(9), ata_id_c_string(9), ata_read_native_max_address(9), ata_set_max_sectors(9), ata_hpa_resize(9), ata_dump_id(9), ata_exec_internal(9), ata_pio_need_iordy(9), ata_pio_mask_no_iordy(9), ata_do_dev_read_id(9), ata_dev_read_id(9), ata_dev_power_set_standby(9), ata_dev_power_set_active(9), ata_read_log_page(9), ata_dev_configure(9), ata_cable_40wire(9), ata_cable_80wire(9), ata_cable_unknown(9), ata_cable_ignore(9), ata_cable_sata(9), sata_print_link_status(9), ata_dev_pair(9), ata_timing_cycle2mode(9), ata_down_xfermask_limit(9), ata_set_mode(9), ata_wait_ready(9), ata_wait_after_reset(9), ata_std_prereset(9), ata_std_postreset(9), ata_dev_same_device(9), ata_dev_reread_id(9), ata_dev_revalidate(9), ata_is_40wire(9), cable_is_40wire(9), ata_dev_xfermask(9), ata_dev_set_xfermode(9), ata_dev_set_feature(9), ata_dev_init_params(9), atapi_check_dma(9), ata_std_qc_defer(9), ata_sg_init(9), ata_sg_clean(9), ata_sg_setup(9), swap_buf_le16(9), ata_qc_free(9), ata_qc_complete(9), ata_qc_get_active(9), ata_qc_issue(9), ata_phys_link_online(9), ata_phys_link_offline(9), ata_link_online(9), ata_link_offline(9), ata_host_suspend(9), ata_host_resume(9), ata_dev_init(9), ata_link_init(9), sata_link_init_spd(9), ata_port_alloc(9), ata_host_alloc(9), ata_host_alloc_pinfo(9), ata_finalize_port_ops(9), ata_host_start(9), ata_host_init(9), ata_host_register(9), ata_host_activate(9), ata_dev_free_resources(9), ata_port_detach(9), ata_host_detach(9), ata_pci_remove_one(9), ata_platform_remove_one(9), ata_msleep(9), ata_wait_register(9)

like I said. the whole group chat. 💜

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and that's the page babes 🫶 this one came out of ./drivers/ata, dated October 2026, and it's part of the Kernel API Manual — go read the other (9) pages if you want the full lore, mwah 🍓✨