_base_get_chain(9)

✨ _base_get_chain — Kernel API Manual (section 9) ✨

okay bestie so this one is a Kernel API Manual page, section 9, and it's literally all about one tiny helper that hands you a virtual chain address. lowkey iconic. let's get into it 🫶

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🌸 NAME 🌸

_base_get_chain — calculates and returns the virtual chain address for the smid you give it, up in BAR0 space. no cap, that's the whole vibe.

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⭐ SYNOPSIS ⭐

void __iomem* _base_get_chain (struct MPT3SAS_ADAPTER *ioc , u16 smid ,
u8 sge_chain_count );

like… look at that signature. it's giving "small function, big responsibility" 💅

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🎀 ARGUMENTS 🎀

• ioc — the per adapter object. the main character of the whole driver, fr fr.
• smid — the system request message index. iykyk, it's the little number that tells you which request you're talking about.
• sge_chain_count — the scatter gather chain count. literally how many chains we're chaining 🦋

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💖 RETURN 💖

the chain address. that's it, that's the tea. it returns the chain address ✨

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👑 SEE ALSO 👑

okay this list is a whole mood — 158 entries, all of them (9) siblings. no skips, bestie, we're reading the whole roster:

• the kernel file 📁 ./drivers/scsi/mpt3sas/mpt3sas_base.c
• mpt3sas_base_check_cmd_timeout(9), _scsih_set_fwfault_debug(9), _base_readl_aero(9), _base_clone_reply_to_sys_mem(9), _base_clone_mpi_to_sys_mem(9), _base_clone_to_sys_mem(9), _base_get_chain_phys(9), _base_get_buffer_bar0(9), _base_get_buffer_phys_bar0(9)
• _base_get_chain_buffer_dma_to_chain_buffer(9), _clone_sg_entries(9), mpt3sas_remove_dead_ioc_func(9), _base_sync_drv_fw_timestamp(9), _base_fault_reset_work(9), mpt3sas_base_start_watchdog(9), mpt3sas_base_stop_watchdog(9), mpt3sas_base_fault_info(9), mpt3sas_base_coredump_info(9), mpt3sas_base_wait_for_coredump_completion(9), mpt3sas_halt_firmware(9)
• _base_sas_ioc_info(9), _base_display_event_data(9), _base_sas_log_info(9), _base_display_reply_info(9), mpt3sas_base_done(9), _base_async_event(9), _base_get_cb_idx(9), mpt3sas_base_pause_mq_polling(9), mpt3sas_base_resume_mq_polling(9), mpt3sas_base_mask_interrupts(9)
• mpt3sas_base_unmask_interrupts(9), _base_process_reply_queue(9), mpt3sas_blk_mq_poll(9), _base_interrupt(9), _base_irqpoll(9), _base_init_irqpolls(9), _base_is_controller_msix_enabled(9), mpt3sas_base_sync_reply_irqs(9), mpt3sas_base_release_callback_handler(9), mpt3sas_base_register_callback_handler(9), mpt3sas_base_initialize_callback_handler(9)
• _base_build_zero_len_sge(9), _base_add_sg_single_32(9), _base_add_sg_single_64(9), _base_get_chain_buffer_tracker(9), _base_build_sg(9), _base_build_nvme_prp(9), base_make_prp_nvme(9), _base_check_pcie_native_sgl(9), _base_add_sg_single_ieee(9), _base_build_zero_len_sge_ieee(9), _base_build_sg_scmd(9), _base_build_sg_scmd_ieee(9), _base_build_sg_ieee(9)
• _base_config_dma_addressing(9), _base_check_enable_msix(9), mpt3sas_base_free_irq(9), _base_request_irq(9), _base_assign_reply_queues(9), _base_check_and_enable_high_iops_queues(9), mpt3sas_base_disable_msix(9), _base_alloc_irq_vectors(9), _base_enable_msix(9), mpt3sas_base_unmap_resources(9), mpt3sas_base_check_for_fault_and_issue_reset(9), mpt3sas_base_map_resources(9)
• mpt3sas_base_get_msg_frame(9), mpt3sas_base_get_sense_buffer(9), mpt3sas_base_get_sense_buffer_dma(9), mpt3sas_base_get_pcie_sgl(9), mpt3sas_base_get_pcie_sgl_dma(9), mpt3sas_base_get_reply_virt_addr(9), _base_get_msix_index(9), _base_get_high_iops_msix_index(9), mpt3sas_base_get_smid(9), mpt3sas_base_get_smid_scsiio(9), mpt3sas_base_get_smid_hpr(9), mpt3sas_base_free_smid(9)
• _base_mpi_ep_writeq(9), _base_writeq(9), _base_set_and_get_msix_index(9), _base_put_smid_mpi_ep_scsi_io(9), _base_put_smid_scsi_io(9), _base_put_smid_fast_path(9), _base_put_smid_hi_priority(9), mpt3sas_base_put_smid_nvme_encap(9), _base_put_smid_default(9), _base_put_smid_scsi_io_atomic(9), _base_put_smid_fast_path_atomic(9), _base_put_smid_hi_priority_atomic(9), _base_put_smid_default_atomic(9)
• _base_display_OEMs_branding(9), _base_display_fwpkg_version(9), _base_display_ioc_capabilities(9), mpt3sas_base_update_missing_delay(9), _base_update_ioc_page1_inlinewith_perf_mode(9), _base_get_event_diag_triggers(9), _base_get_scsi_diag_triggers(9), _base_get_mpi_diag_triggers(9), _base_get_master_diag_triggers(9), _base_check_for_trigger_pages_support(9), _base_get_diag_triggers(9), _base_update_diag_trigger_pages(9), _base_assign_fw_reported_qd(9)
• mpt3sas_atto_validate_nvram(9), mpt3sas_atto_get_sas_addr(9), mpt3sas_atto_init(9), _base_static_config_pages(9), mpt3sas_free_enclosure_list(9), _base_release_memory_pools(9), mpt3sas_check_same_4gb_region(9), _base_reduce_hba_queue_depth(9), _base_allocate_pcie_sgl_pool(9), _base_allocate_chain_dma_pool(9), _base_allocate_sense_dma_pool(9), _base_allocate_reply_pool(9), _base_allocate_reply_free_dma_pool(9), _base_allocate_reply_post_free_array(9), base_alloc_rdpq_dma_pool(9), _base_allocate_memory_pools(9)
• mpt3sas_base_get_iocstate(9), _base_wait_on_iocstate(9), _base_dump_reg_set(9), _base_wait_for_doorbell_int(9), _base_wait_for_doorbell_ack(9), _base_wait_for_doorbell_not_used(9), _base_send_ioc_reset(9), mpt3sas_wait_for_ioc(9), _base_handshake_req_reply_wait(9), mpt3sas_base_sas_iounit_control(9)
• mpt3sas_base_scsi_enclosure_processor(9), _base_get_port_facts(9), _base_wait_for_iocstate(9), _base_get_ioc_facts(9), _base_send_ioc_init(9), mpt3sas_port_enable_done(9), _base_send_port_enable(9), mpt3sas_port_enable(9), _base_determine_wait_on_discovery(9)
• _base_unmask_events(9), _base_event_notification(9), mpt3sas_base_validate_event_type(9), mpt3sas_base_unlock_and_get_host_diagnostic(9), mpt3sas_base_lock_host_diagnostic(9), _base_diag_reset(9), mpt3sas_base_make_ioc_ready(9), _base_make_ioc_operational(9)
• mpt3sas_base_free_resources(9), mpt3sas_base_attach(9), mpt3sas_base_detach(9), _base_pre_reset_handler(9), _base_clear_outstanding_mpt_commands(9), _base_clear_outstanding_commands(9), _base_reset_done_handler(9), mpt3sas_wait_for_commands_to_complete(9), _base_check_ioc_facts_changes(9), mpt3sas_base_hard_reset_handler(9)

like, that's a friend group and a half. ate. 💀

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🧚 that's genuinely everything this page says — chain address calculated, chain address returned, and an absolute swarm of (9) cross-refs. periodt.

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and that's a wrap, bestie! this page comes to you from ./drivers/scsi/mpt3sas and it's dated October 2026 — section 9, _base_get_chain, out. 🎀💜