rsu_send_msg(9)

💅 NAME 💅

rsu_send_msg — bestie, this is the one that sends a message to the Intel service layer ✨

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✨ SYNOPSIS ✨

int rsu_send_msg (struct stratix10_rsu_priv *priv , enum
stratix10_svc_command_code command , unsigned long arg , rsu_callback
callback );

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🎀 ARGUMENTS 🎀

• priv — pointer to rsu private data 🫶 lowkey just the private data for this rsu, hand it over and we're so good
• command — the RSU status or update command 👑 you're picking the vibe of the whole operation here
• arg — the request argument, the bitstream address or notify status 🌈 so it's either the bitstream address or a notify status, depending on what you're doing, iykyk
• callback — function pointer for the callback (status or update) 🦋 status callback or update callback, either way it's the thing that gets called back

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🦋 DESCRIPTION 🦋

Okay so here's the whole plot: this kicks off an Intel service layer transaction so the SMC call can happen — and that SMC call is literally required to get the RSU boot log or to set the address of the bitstream to boot after reboot 🧚✨

Heads up bestie: this call will block until the RSU lock can be acquired 💀 like, it's not gonna just quietly give up, it waits its turn. No cap.

It returns 0 on success, or a negative errno on failure 😭 so check that return value, fr fr.

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🌸 SEE ALSO 🌸

Kernel file ./drivers/firmware/stratix10-rsu.c 🍓

• rsu_device_info_set_from_packed(9)
• struct stratix10_rsu_priv(9)
• rsu_device_info_invalidate(9)
• rsu_status_callback(9)
• rsu_async_status_callback(9)
• rsu_command_callback(9)
• rsu_retry_callback(9)
• rsu_max_retry_callback(9)
• rsu_dcmf_version_callback(9)
• rsu_dcmf_status_callback(9)
• rsu_get_device_info_callback(9)
• rsu_async_get_spt_table_callback(9)
• __rsu_send_msg_locked(9)
• rsu_try_send_msg(9)
• soc64_async_callback(9)
• rsu_send_async_msg(9)

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And that's the whole thing, bestie — brought to you by ./drivers/firmware, stamped October 2026, living its best life as part of the Kernel API Manual 💜🎀 slay, go read the source, mwah 💅