do_siga_output(9)

💅 do_siga_output — a kernel manual, but make it cute

okay bestie, so this is do_siga_output(9) from the Kernel API Manual — yes, that's the manual name, we're being fancy today ✨ — and it's literally the page that does the SIGA-w/wt function. That's it, that's the whole vibe. Let's get into it 🫶

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✨ SYNOPSIS ✨

int do_siga_output (unsigned long schid , unsigned long mask , unsigned
int *bb , unsigned long fc , dma64_t aob );

look at that signature. she's giving "five arguments and a dream" 😭

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🎀 ARGUMENTS 🎀

• schid — the subchannel id 💖 or, plot twist, in the case of QEBSM it's the subchannel token instead. iykyk.
• mask — which output queues to process. pick your fighters 👑
• bb — the busy bit indicator, and it's set only if SIGA-w/wt could not access a buffer. so if you see it lit up, something got blocked. no cap.
• fc — the function code to perform 🔥
• aob — the asynchronous operation block

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🌸 DESCRIPTION 🌸

Returns condition code. that's the whole description bestie, she's short and iconic 💅

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🦋 NOTE 🦋

For IQDC unicast queues only the highest priority queue is processed. so don't come for the others, they're not invited to the party 🙈

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⭐ SEE ALSO ⭐

Kernel file ./drivers/s390/cio/qdio_main.c and honestly a whole squad of friends:

• qdio_do_eqbs(9)
• qdio_do_sqbs(9)
• qdio_get_ssqd_desc(9)
• qdio_shutdown(9)
• qdio_free(9)
• qdio_allocate(9)
• qdio_establish(9)
• qdio_activate(9)
• handle_inbound(9)
• qdio_add_bufs_to_input_queue(9)
• handle_outbound(9)
• qdio_add_bufs_to_output_queue(9)
• qdio_start_irq(9)
• qdio_stop_irq(9)

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💜 and that's the page!! this little gem lives in ./drivers/s390/cio, the version is October 2026, and it's filed under do_siga_output(9). go forth and SIGA, bestie 🌈✨🎀