hl_fw_dynamic_send_cmd(9)

📦 version 7.3.1, in nixpkgs unstable

💖 hl_fw_dynamic_send_cmd — Kernel API Manual, section 9 🎀

okay so bestie, welcome to the glow-up of hl_fw_dynamic_send_cmd(9) — this is a kernel API manual page from the Kernel API Manual, section 9, and it's literally all about yeeting an LKD-to-FW command at your device. no cap, it's short, but every word slays. let's get into it 💅

✨ NAME ✨

hl_fw_dynamic_send_cmd — send LKD to FW cmd 🦋

like, that's the whole vibe: you have an LKD-to-FW command, and this function sends it. periodt.

🌸 SYNOPSIS 🌸

void hl_fw_dynamic_send_cmd (struct hl_device *hdev , struct fw_load_mgr
*fw_loader , enum comms_cmd cmd , unsigned int size );

it returns void, so like… it doesn't hand anything back. it just does the thing. main character energy fr fr 👑

🫶 ARGUMENTS 🫶

  • hdev — pointer to the habanalabs device structure. this is your device's whole identity, its moment, its lore.
  • fw_loader — the managing structure for loading the device's FW. think of it as the group chat admin for firmware ops.
  • cmd — the LKD to FW cmd code. which command are we sending? this tells you.
  • size — size of the next FW component to be loaded (0 if not necessary). iconic little detail, more on this in a sec 👀

💜 DESCRIPTION 💜

the LDK to FW exact command layout is defined at struct comms_command. that's where the blueprint lives — go look at struct comms_command if you wanna see the full fit. 💀

🍓 NOTE 🍓

okay so this is the part you cannot skim, bestie:

the size argument is used only when the next FW component should be loaded — otherwise it shall be 0.

and the tea on why: size is used by the FW in later protocol stages, and when sending, it's only indicating the amount of memory the FW needs to allocate to receive the next boot component. so it's not decorative, it's literally telling the FW how much room to clear for the next guest. 🌈⭐

🧚 SEE ALSO 🧚

the kernel file it lives in, first of all:

  • Kernel file ./drivers/accel/habanalabs/common/firmware_if.c

and then the whole friend group — every single one of these, no skipping, iykyk:

like, that's the whole squad. go read them. or don't. but they're there. 🫶

and that's the page, bestie!! 🎀 source: ./drivers/accel/habanalabs/common, dated October 2026 — mwah, sending you off with a hl_fw_dynamic_send_cmd(9) and a lil kiss 💋✨

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