STRUCT UNDEFINED_OPCODE_INFO(9)

✨ struct undefined_opcode_info(9) ✨

okay so this is the Kernel API Manual page for the lil struct that keeps the receipts on the last undefined opcode error. it’s giving diagnostic memory box energy, and we’re gonna read every field together, bestie 🫶

💖 NAME 💖

struct undefined_opcode_info — info about last undefined opcode error.

🌸 SYNOPSIS 🌸

here’s the shape of it, no cap:

       struct undefined_opcode_info {
           ktime_t timestamp;
           u64
       cb_addr_streams[MAX_QMAN_STREAMS_INFO][OPCODE_INFO_MAX_ADDR_SIZE];
           u64 cq_addr;
           u32 cq_size;
           u32 cb_addr_streams_len;
           u32 engine_id;
           u32 stream_id;
           bool write_enable;
        };

🎀 Members 🎀

• timestamp — timestamp of the undefined opcode error ⏰
• cb_addr_streams — CB addresses (per stream) that are currently in the PQ entries. if all the streams array entries are filled with values, it means the execution was in Lower-CP 💅
• cq_addr — the address of the current handled command buffer
• cq_size — the size of the current handled command buffer
• cb_addr_streams_len — num of streams — the actual len of the cb_addr_streams array. should be equal to 1 in case of undefined opcode in Upper-CP (specific stream) and equal to 4 in case of undefined opcode in Lower-CP
• engine_id — engine-id that the error occurred on
• stream_id — the stream id the error occurred on. in case the stream equals to MAX_QMAN_STREAMS_INFO it means the error occurred on a Lower-CP
• write_enable — if set, writing to undefined opcode parameters in the structure is enabled so the first (root cause) undefined opcode will not be overwritten

🦋 SEE ALSO 🦋

the kernel file is ./drivers/accel/habanalabs/common/habanalabs.h, and the whole ref friend group is:

• enum hl_mmu_page_table_location(9), struct iterate_module_ctx(9), struct hl_gen_wait_properties(9), struct pgt_info(9), enum hl_pci_match_mode(9)
• enum hl_fw_component(9), enum hl_fw_types(9), enum hl_queue_type(9), struct hw_queue_properties(9), enum vm_type(9)
• enum mmu_op_flags(9), enum hl_device_hw_state(9), struct hl_mmu_properties(9), struct hl_hints_range(9), struct asic_fixed_properties(9)
• struct hl_fence(9), struct hl_cs_compl(9), struct hl_ts_buff(9), struct hl_mem_mgr(9), struct hl_mem_mgr_fini_stats(9)
• struct hl_mmap_mem_buf_behavior(9), struct hl_mmap_mem_buf(9), struct hl_cb(9), struct hl_sync_stream_properties(9), struct hl_encaps_signals_mgr(9)
• struct hl_hw_queue(9), struct hl_cq(9), struct hl_ts_free_jobs(9), struct hl_user_interrupt(9), struct timestamp_reg_free_node(9)
• struct hl_user_pending_interrupt(9), struct hl_eq(9), struct hl_dec(9), enum hl_asic_type(9), enum hl_pm_mng_profile(9)
• enum hl_pll_frequency(9), struct pci_mem_region(9), struct static_fw_load_mgr(9), struct fw_response(9), struct dynamic_fw_load_mgr(9)
• struct pre_fw_load_props(9), struct fw_image_props(9), struct fw_load_mgr(9), struct engines_data(9), struct hl_asic_funcs(9)
• enum hl_va_range_type(9), struct hl_va_range(9), struct hl_cs_counters_atomic(9), struct hl_dmabuf_priv(9), struct hl_cs_outcome(9)
• struct hl_cs_outcome_store(9), struct hl_ctx(9), struct hl_ctx_mgr(9), struct hl_userptr(9), struct hl_cs(9)
• struct hl_cs_job(9), struct hl_cs_parser(9), struct hl_vm_hash_node(9), struct hl_vm_hw_block_list_node(9), struct hl_vm_phys_pg_pack(9)
• struct hl_vm_va_block(9), struct hl_vm(9), struct hl_debug_params(9), struct hl_notifier_event(9), struct hl_fpriv(9)
• struct hl_info_list(9), struct hl_debugfs_entry(9), struct hl_dbg_device_entry(9), struct hl_debugfs_cfg_access_entry(9), struct hl_debugfs_cfg_access(9)
• struct hl_hw_obj_name_entry(9), struct hl_mon_state_dump(9), struct hl_sync_to_engine_map_entry(9), struct hl_sync_to_engine_map(9), struct hl_state_dump_specs_funcs(9)
• struct hl_state_dump_specs(9), struct hl_device_reset_work(9), struct hl_mmu_priv(9), struct hl_mmu_per_hop_info(9), struct hl_mmu_hop_info(9)
• struct hl_hr_mmu_funcs(9), struct hl_mmu_funcs(9), struct hl_prefetch_work(9), struct multi_cs_completion(9), struct multi_cs_data(9)
• struct hl_clk_throttle_timestamp(9), struct hl_clk_throttle(9), struct user_mapped_block(9), struct cs_timeout_info(9), struct page_fault_info(9)
• struct razwi_info(9), struct hw_err_info(9), struct fw_err_info(9), struct engine_err_info(9), struct hl_error_info(9)
• struct hl_reset_info(9), struct eq_heartbeat_debug_info(9), struct hl_device(9), struct hl_cs_encaps_sig_handle(9), struct hl_info_fw_err_info(9)
• hl_ioctl_t(9), struct hl_ioctl_desc(9), hl_get_sg_info(9), hl_mem_area_inside_range(9), hl_mem_area_crosses_range(9)

mwah 💋 this page lives at ./drivers/accel/habanalabs/common, dated October 2026, under the struct undef..._opcode_info(9) header — bye bestie, slay your debugging 🫶