STRUCT FW_RSC_TRACE(9)

🦋 struct fw_rsc_trace(9) — Kernel API Manual, but make it make sense 🦋

okay so bestie, welcome to the struct fw_rsc_trace(9) page 💅 this is the Linux kernel API manual for a trace buffer declaration, and no cap, it's lowkey iconic how much a tiny struct can do.

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✨ NAME ✨

struct fw_rsc_trace — trace buffer declaration 🎀

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🌸 SYNOPSIS 🌸

struct fw_rsc_trace {
    u32 da;
    u32 len;
    u32 reserved;
    u8 name[32];
 };

like, that's the whole struct. four fields. she's simple, she's effective, she ate 🔥

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🫶 Members 🫶

not "options" bestie, these are members, and each one is doing her own little job:

• da — the device address 💖
• len — the length, and specifically in bytes (do NOT forget the bytes, that's the whole vibe check)
• reserved — reserved, and it must be zero. like, fr fr, zero. don't be quirky with this one 🙈
• name — a human-readable name of the trace buffer ✨ (yes, u8 name[32], so share accordingly)

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👑 Description 👑

okay so here's the lore 🧚 this resource entry is literally out here providing the host with information about a trace buffer — and that buffer is where the remote processor is gonna write its log messages 📝✨

so da specifies the device address of the buffer, len specifies its size, and name may contain a human readable name of the trace buffer. that's the trio, that's the group chat 💅

then, after booting the remote processor, the trace buffers get exposed to the user via debugfs entries — and they're called trace0, trace1, etc.. 🙈⭐ so if you ever go poking around and see trace0 just sitting there, now you know exactly who she is. main character energy, honestly.

lowkey important reminder: reserved must be zero. it's not a suggestion, it's the rule. 💀

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🌈 SEE ALSO 🌈

go read these next, bestie, they're all in the same friend group:

• Kernel file ./include/linux/rsc_table.h
• struct resource_table(9)
• struct fw_rsc_hdr(9)
• enum fw_resource_type(9)
• struct fw_rsc_carveout(9)
• struct fw_rsc_devmem(9)
• struct fw_rsc_vdev_vring(9)
• struct fw_rsc_vdev(9)
• rsc_table_for_each_entry(9)

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and that's the page, bestie 🫶 this gem lives in ./include/linux, it's dated October 2026, and the manual you just read is struct fw_rsc_trace(9) — slay, go read the kernel, ily, bye 💖✨🎀