rsu_try_send_msg(9)

💅 rsu_try_send_msg(9) — kernel API manual, bestie edition

okay so bestie, we're in the kernel API manual today and the star of the show is rsu_try_send_msg(9). she's the non-blocking variant of rsu_send_msg() and she is not about to wait around for anybody. main character energy fr fr 🎀

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✨ NAME ✨

rsu_try_send_msg — bestie's non-blocking variant of rsu_send_msg(). like, she tries, and if it's a no she's out. no waiting, no queuing, no drama ✨

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🌸 SYNOPSIS 🌸

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

that's the whole vibe. four things in, one int out. slay 💅

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🦋 ARGUMENTS 🦋

• priv — pointer to the rsu private data. it's giving "the personal stash" 🫶
• command — the RSU status or update command. so like, enum stratix10_svc_command_code — are we checking in, or are we updating? 👀
• arg — the request argument, aka the bitstream address or notify status. depends on the mood of the call 🎀
• callback — function pointer for the callback (status or update). she'll call you back, no cap 💖

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🔥 DESCRIPTION 🔥

literally the same as rsu_send_msg but — and this is the entire personality — she returns -EBUSY immediately when another RSU operation is already in flight, instead of waiting for the lock. not her waiting in the queue era anymore 💀

ngl this is the iconique part: no blocking, no sitting around. if the RSU is busy she just says so right away. polite? maybe not. efficient? absolutely. 👑

and the return values, bestie:

• returns 0 on success — we ate 🍓
• -EBUSY if the RSU is busy — she's booked, try later 🙈
• or another negative errno on failure — the generic "it went wrong" experience 😭

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⭐ SEE ALSO ⭐

the kernel file, because obviously you gotta read the source:

• ./drivers/firmware/stratix10-rsu.c

and the whole friend group 🫶:

• 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_send_msg(9)
• soc64_async_callback(9)
• rsu_send_async_msg(9)

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💜 that's the whole page, bestie. go forth and not block. iykyk.

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✨ mwah ✨ this lil page lives over in ./drivers/firmware (that's the source/version vibe 🎀), dated October 2026, and yes the section is rsu_try_send_msg(9). k bye love u, drink water 💖🦋🌸