qcom_register_ssr_notifier(9)

💅 qcom_register_ssr_notifier(9) — from the Kernel API Manual ✨

okay so bestie, this is a page straight out of the Kernel API Manual, and it's about getting yourself on the notification list for a remote processor's whole entire life cycle. no cap, it's lowkey iconic. let's get into it 🎀

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✨ NAME ✨

qcom_register_ssr_notifier — literally registers an SSR notification handler 🦋

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🌸 SYNOPSIS 🌸

void * qcom_register_ssr_notifier (const char *name , struct
       notifier_block *nb );

like, that's the whole signature. void * out front, two arguments, we move 💅

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🎀 ARGUMENTS 🎀

• name — the subsystem's SSR name 💖 like, which remote proc are we talking about here
• nb — the notifier_block that gets invoked when the subsystem's state changes. this is your callback's whole home fr fr 🫶

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👑 DESCRIPTION 👑

so what this does is: it registers the nb notifier block as part of the notifier chain for a remoteproc associated with name. periodt. 💅

and then — this is the good part — the notifier block's callback gets invoked whenever the remote processor's SSR events occur. and the events are: pre/post startup and pre/post shutdown. so you're getting pinged on both ends of the vibe check, before and after, startup and shutdown. four events, all of them, no crumbs 😭✨

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💀 RETURN 💀

• on success, it returns a subsystem cookie 🍪 (yes really, that's the term)
• on failure, it returns ERR_PTR — so check that thing before you go dereferencing it, bestie, i'm begging 🙈

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🌈 SEE ALSO 🌈

the kernel file involved is ./drivers/remoteproc/qcom_common.c — that's where the magic lives, go read it 🧚

and also, the whole friend group:

• struct minidump_region(9)
• struct minidump_subsystem(9)
• struct minidump_global_toc(9)
• qcom_add_glink_subdev(9)
• qcom_remove_glink_subdev(9)
• qcom_register_dump_segments(9)
• qcom_add_smd_subdev(9)
• qcom_remove_smd_subdev(9)
• qcom_unregister_ssr_notifier(9)
• qcom_add_ssr_subdev(9)
• qcom_remove_ssr_subdev(9)
• qcom_add_pdm_subdev(9)
• qcom_remove_pdm_subdev(9)

like, the consistency? we love to see it 👑

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okay that's the page, ily, go register those notifiers responsibly 💜 this came from ./drivers/remoteproc, dated October 2026, and it's qcom_register_ssr_notifier(9) — bye bestie, slay 🫶🎀🌟