_base_writeq(9)

💅 _base_writeq(9) — 64 bit write to MMIO 💅

okay so bestie, welcome to _base_writeq(9) from the Kernel API Manual ✨ this one is short and iconic: it’s the 64 bit write to MMIO situation. no cap.

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🌸 NAME 🌸

_base_writeq — 64 bit write to MMIO 👑

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✨ SYNOPSIS ✨

void _base_writeq (__u64 b , volatile void __iomem *addr , spinlock_t
       *writeq_lock );

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🎀 ARGUMENTS 🎀

• b — data payload, aka the actual stuff being written 💖
• addr — address in MMIO space, aka where it’s headed 📍
• writeq_lock — spin lock, the locking situation 🔒

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💖 DESCRIPTION 💖

This is glue for handling an atomic 64 bit word to MMIO ✨ it’s special handling, and it takes care of 32 bit environment where it’s not guaranteed to send the entire word in one transfer 💅. that’s the lore, fr fr 🫶

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🦋 SEE ALSO 🦋

• 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(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_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)

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that’s the whole vibe, bestie 🫶 the source/version line says ./drivers/scsi/mpt3sas, the date is October 2026, and the page id is _base_writeq(9) 💅✨