ap_owned_by_def_drv(9)

💅 ap_owned_by_def_drv(9) — the kernel API manual, bestie edition

okay so real talk, this is a page from the Kernel API Manual, and the star of the show is ap_owned_by_def_drv — the lil' function that answers the question every adapter has been dying to know: is this AP adapter reserved for the default host driver or not? 🎀

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✨ NAME ✨

ap_owned_by_def_drv — literally just tells you whether an AP adapter is reserved for the default host driver or not. that's the whole vibe. no cap. 🦋

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🌸 SYNOPSIS 🌸

int ap_owned_by_def_drv (int card , int queue );

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🧚 ARGUMENTS 🧚

• card — the APID of the adapter card you wanna check 👑
• queue — the APQI of the queue you wanna check 🍓

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💀 NOTE 💀

bestie, listen to me: the ap_attr_mutex must be locked by the caller of this function. like, that's on you, not on the function. lock it or... don't? (no — lock it. fr fr.) 🔥

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⭐ RETURN ⭐

returns an int telling you whether the AP adapter is reserved for the host — 1 means yes it is reserved — or 0 means nope, not reserved. that's it, that's the whole answer sheet 💖

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💜 SEE ALSO 💜

• Kernel file ./drivers/s390/crypto/ap_bus.c
• ap_airq_ptr(9)
• ap_interrupts_available(9)
• ap_qci_available(9)
• ap_apft_available(9)
• ap_init_qci_info(9)
• ap_request_timeout(9)
• ap_poll_timeout(9)
• ap_interrupt_handler(9)
• ap_tasklet_fn(9)
• ap_poll_thread(9)
• ap_bus_match(9)
• ap_uevent(9)
• ap_apqn_in_matrix_owned_by_def_drv(9)
• ap_select_domain(9)
• ap_get_configuration(9)
• ap_scan_bus(9)
• ap_module_init(9)

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and that's the whole page, bestie!! 🫶 it lives over in ./drivers/s390/crypto, and this particular edition is dated October 2026 — like, future iconic behavior. go forth and check those ownership bits responsibly 💅✨