host_trace_buffer_size_show(9)

✨ host_trace_buffer_size_show(9) ✨

okay so bestie, welcome to the Kernel API Manual 💖 this one's a short one, so grab a lil snack and let's go 🍓

---

🌸 NAME 🌸

host_trace_buffer_size_show — literally just the host buffer size (trace only, no cap) 💅

---

🦋 SYNOPSIS 🦋

ssize_t host_trace_buffer_size_show (struct device *cdev , struct
device_attribute *attr , char *buf );

---

🎀 ARGUMENTS 🎀

• cdev — pointer to the embedded class device 🫶
• attr — ? … yeah bestie, even the docs are like "idk" 😭 that's it, that's the whole description
• buf — the buffer returned, aka where the goods go ✨

---

👑 DESCRIPTION 👑

it's giving a sysfs 'read-only' shost attribute. that's the whole vibe. no writes, no drama, read-only periodt 🔥

---

🌈 SEE ALSO 🌈

the kernel file ./drivers/scsi/mpt3sas/mpt3sas_ctl.c and honestly the entire extended friend group:

enum block_state(9), _ctl_display_some_debug(9), mpt3sas_ctl_done(9), _ctl_check_event_type(9), mpt3sas_ctl_add_to_event_log(9), mpt3sas_ctl_event_callback(9), _ctl_verify_adapter(9), mpt3sas_ctl_pre_reset_handler(9), mpt3sas_ctl_clear_outstanding_ioctls(9), mpt3sas_ctl_reset_done_handler(9), _ctl_fasync(9), _ctl_poll(9), _ctl_set_task_mid(9), _ctl_send_mctp_passthru_req(9), _ctl_do_mpt_command(9), _ctl_getiocinfo(9), _ctl_eventquery(9), _ctl_eventenable(9), _ctl_eventreport(9), _ctl_do_reset(9), _ctl_btdh_search_sas_device(9), _ctl_btdh_search_pcie_device(9), _ctl_btdh_search_raid_device(9), _ctl_btdh_mapping(9), _ctl_diag_capability(9), _ctl_diag_get_bufftype(9), _ctl_diag_register_2(9), mpt3sas_enable_diag_buffer(9), _ctl_diag_register(9), _ctl_diag_unregister(9), _ctl_diag_query(9), mpt3sas_send_diag_release(9), _ctl_diag_release(9), _ctl_diag_read_buffer(9), _ctl_addnl_diag_query(9), _ctl_enable_diag_sbr_reload(9), _ctl_compat_mpt_command(9), _ctl_ioctl_main(9), _ctl_get_mpt_mctp_passthru_adapter(9), mpt3sas_get_device_count(9), _ctl_ioctl(9), _ctl_mpt2_ioctl(9), _ctl_ioctl_compat(9), _ctl_mpt2_ioctl_compat(9), version_fw_show(9), version_bios_show(9), version_mpi_show(9), version_product_show(9), version_nvdata_persistent_show(9), version_nvdata_default_show(9), board_name_show(9), board_assembly_show(9), board_tracer_show(9), io_delay_show(9), device_delay_show(9), fw_queue_depth_show(9), host_sas_address_show(9), logging_level_show(9), fwfault_debug_show(9), ioc_reset_count_show(9), reply_queue_count_show(9), BRM_status_show(9), host_trace_buffer_show(9), host_trace_buffer_enable_show(9), diag_trigger_master_show(9), diag_trigger_master_store(9), diag_trigger_event_show(9), diag_trigger_event_store(9), diag_trigger_scsi_show(9), diag_trigger_scsi_store(9), diag_trigger_mpi_show(9), diag_trigger_mpi_store(9), drv_support_bitmap_show(9), enable_sdev_max_qd_show(9), enable_sdev_max_qd_store(9), sas_address_show(9), sas_device_handle_show(9), sas_ncq_prio_supported_show(9), sas_ncq_prio_enable_show(9), mpt3sas_ctl_init(9), mpt3sas_ctl_release(9), mpt3sas_ctl_exit(9)

like, that's the whole group chat and you're invited 🫶 no cap.

---

ngl this page is short enough to read in one breath, so go read the related ones if you want the lore 🔥

---

and that's a wrap, bestie 🎀 this lil page lives at ./drivers/scsi/mpt3sas, dated October 2026, and it's the host_trace_buffer_size_show(9) moment — slay, bye 💜