qdio_get_ssqd_desc(9)

💫 qdio_get_ssqd_desc — Kernel API Manual 💫

okay so bestie, welcome to the qdio_get_ssqd_desc(9) page — it lives in the Kernel API Manual and honestly? it's a little one, but it's iconic for what it does. think of it as the function that goes and asks the subchannel "hey queen, tell me about yourself" and then writes the answer down for you. 🎀

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🌸 NAME 🌸

qdio_get_ssqd_desc — get qdio subchannel description

like, literally: get the qdio subchannel description. that's the whole vibe check. 💅

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✨ SYNOPSIS ✨

int qdio_get_ssqd_desc (struct ccw_device *cdev , struct qdio_ssqd_desc
*data );

two args, one int coming back at you. no cap. 🦋

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🫶 ARGUMENTS 🫶

• cdev — the ccw device you want the description for, bestie. that's your main character right there.
• data — the spot where the ssqd gets stored. it's giving "give me somewhere to put my stuff." 🍓

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👑 DESCRIPTION 👑

so what happens is: this returns 0 or an error code — simple as that, no drama. ✨ and the results of the chsc? they get stored in that structure you passed in as data. literally that's it. the chsc said what it said and we're keeping the receipts. 🔥

ngl, the error code part matters — don't just assume 0 and move on with your life, check it. 💀

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🌈 SEE ALSO 🌈

Kernel file ./drivers/s390/cio/qdio_main.c, plus the whole friend group — go say hi:

• do_siga_output(9)
• qdio_do_eqbs(9)
• qdio_do_sqbs(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, bestie! 🧚 source/version is ./drivers/s390/cio, dated October 2026, and the whole thing is filed under qdio_get_ssqd_desc(9). slay, go read your subchannel descriptions responsibly. 💖⭐🙈