epf_ntb_probe(9)

💅 epf_ntb_probe(9) — Kernel API Manual, bestie edition 🎀

okay so this is epf_ntb_probe from the Kernel API Manual, and honestly? she's giving "first day of school" energy — this is the function that shows up when the endpoint function bus finally meets its NTB match 💖

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✨ NAME ✨

epf_ntb_probe — probe the NTB function driver 🫶

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🌸 SYNOPSIS 🌸

int epf_ntb_probe (struct pci_epf *epf , const struct pci_epf_device_id
*id );

like literally that's the whole signature, no cap 🌈

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🦋 ARGUMENTS 🦋

• epf — the NTB endpoint function device. yes bestie, the device, the main character of this whole operation 👑
• id — the NTB endpoint function device ID. her little name tag 🎀

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💜 DESCRIPTION 💜

so basically: the NTB function driver gets probed whenever the endpoint function bus detects an NTB endpoint function. that's it, that's the vibe check ✨ the bus spots an NTB endpoint function, and this function gets called to probe the driver for it. iconic behaviour, ngl 💅

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🔥 RETURN 🔥

• Zero for success — slay, we ate 🍓
• an error code if things go sideways — 😭 not the failure case

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🧚 SEE ALSO 🧚

the kernel file where all the magic lives:

./drivers/pci/endpoint/functions/pci-epf-vntb.c

and her whole friend group, fr fr:

• epf_ntb_link_up(9)
• epf_ntb_configure_mw(9)
• epf_ntb_teardown_mw(9)
• epf_ntb_cmd_handler(9)
• epf_ntb_config_sspad_bar_clear(9)
• epf_ntb_config_sspad_bar_set(9)
• epf_ntb_config_spad_bar_free(9)
• epf_ntb_config_spad_bar_alloc(9)
• epf_ntb_configure_interrupt(9)
• epf_ntb_db_bar_init(9)
• epf_ntb_db_bar_clear(9)
• epf_ntb_mw_bar_init(9)
• epf_ntb_mw_bar_clear(9)
• epf_ntb_is_bar_used(9)
• epf_ntb_find_bar(9)
• epf_ntb_init_epc_bar(9)
• epf_ntb_epc_init(9)
• epf_ntb_epc_cleanup(9)
• epf_ntb_add_cfs(9)
• epf_ntb_bind(9)
• epf_ntb_unbind(9)

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okay that's the whole page, mwah 💋 this came from ./drivers/pci/endpoint/functions and it's dated October 2026 — shoutout to epf_ntb_probe(9) herself for being the moment 💖 go probe something, bestie 🦋✨