r535_gsp_libos_debugfs_init(9)

💅 r535_gsp_libos_debugfs_init(9) — from the Kernel API Manual, with love ✨

okay so bestie, this is the manual page for r535_gsp_libos_debugfs_init(9) from the Kernel API Manual. It’s literally about creating logging debugfs entries, and we’re gonna get into it. No cap. 🫶

🎀 NAME 🎀

r535_gsp_libos_debugfs_init — create logging debugfs entries 💖

✨ SYNOPSIS ✨

void r535_gsp_libos_debugfs_init (struct nvkm_gsp *gsp );

🌸 ARGUMENTS 🌸

• gsp — a gsp pointer. That’s it, that’s the argument. 🫶

🦋 DESCRIPTION 🦋

Okay so this function creates the debugfs entries. The way it exposes the log buffers to userspace so that an external tool can parse it? Obsessed. 🔥

The logpmu entry contains exception dumps from the PMU. It is written via an RPC sent from GSP-RM and must be only 4KB — yes, only 4KB, periodt. We create it here because it’s only useful if there is a debugfs entry to expose it. And if we get the PMU logging RPC and there is no debugfs entry, the RPC is just ignored. Bye. 💀

The blob_init, blob_rm, and blob_pmu objects can’t be transient because debugfs_create_blob doesn’t copy them. So no transience for them, bestie. 🎀

🫶 NOTE 🫶

okay so OpenRM vibes: it loads the logging elf image and prints the log messages in real-time. We may add that capability in the future, but that requires loading ELF images that are not distributed with the driver and adding the parsing code to Nouveau — so it’s a whole thing. 🌈

Ideally, this should be part of nouveau_debugfs_init, but that function is called too late. We really want to create these debugfs entries before r535_gsp_booter_load is called, so that if GSP-RM fails to initialize, there could still be a log to capture. That’s the whole point, fr fr. 💅

🌟 SEE ALSO 🌟

• Kernel file: ./drivers/gpu/drm/nouveau/nvkm/subdev/gsp/rm/r535/gsp.c
• nvkm_gsp_mem_ctor(9)
• struct registry_list_entry(9)
• add_registry(9)
• build_registry(9)
• clean_registry(9)
• strip(9)
• r535_gsp_rpc_set_registry(9)
• r535_gsp_msg_run_cpu_sequencer(9)
• struct rpc_ucode_libos_print_v1e_08(9)
• r535_gsp_msg_libos_print(9)
• create_debugfs(9)
• create_pte_array(9)
• r535_gsp_libos_init(9)
• nvkm_gsp_radix3_sg(9)
• r535_debugfs_shutdown(9)
• is_empty(9)
• r535_gsp_copy_log(9)
• r535_gsp_retain_logging(9)
• r535_gsp_libos_debugfs_fini(9)

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xoxo, footer energy: source/version is ./drivers/gpu/drm/nouveau/nvkm..., dated October 2026, and the whole thing is stamped r535_gsp_libos_debugfs_init(9) 💖