_base_readl_aero(9)

💅 _base_readl_aero(9) — Kernel API Manual, section 9 ✨

okay so bestie, welcome to the mpt3sas lore. this one's a tiny little helper — like, one job, does it well, main character energy in a single line of C. it lives in the Kernel API Manual (that's section 9 for the uninitiated) and honestly? it's giving "unsung hero of the Fusion driver." 🎀

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🌸 NAME 🌸

_base_readl_aero — retry readl for max three times.

like, that's it. that's the whole vibe. she reads, and if the read comes back sus, she tries again. up to three times. no cap. ✨

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🦋 SYNOPSIS 🦋

u32 _base_readl_aero (const void __iomem *addr );

yes, that u32 return is doing a lot of heavy lifting and yes, the const void __iomem * is exactly as written — copy it character for character, bestie, we don't freestyle types around here 💅

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🌈 ARGUMENTS 🌈

• addr — the MPT Fusion system interface register address 💖 like, the actual spot in the register map we're peeking at. point her at the right address and she'll do the rest.

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👑 DESCRIPTION 👑

so here's the tea ☕ — this function retries the readl for max three times if it gets a zero value while reading the system interface register.

that's it! that's the whole plot. if the read comes back as 0, she's not just gonna shrug and accept it — she goes back in. up to three times, max. then she reports back. periodt. 🔥

ngl bestie, the original is very short on details here, so I'm not gonna invent any — no extra guarantees, no "what happens after three zeros," none of that. the manpage says what it says and we respect the source. 🫶

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⭐ SEE ALSO ⭐

first up, the home base — the actual kernel file where this lives:

• Kernel file ./drivers/scsi/mpt3sas/mpt3sas_base.c 📁

and now… the group chat. the entire mpt3sas squad, every single one of them, (9) and all, exactly as they appear. do not scroll past, they all pulled up 💀:

mpt3sas_base_check_cmd_timeout(9), _scsih_set_fwfault_debug(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_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)

iykyk 💜 that's the whole crew and not a single one got left behind.

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🌸 and that's the page, bestie 🌸

this lil masterpiece comes to you straight out of ./drivers/scsi/mpt3sas and it's dated October 2026 — so like, future iconic. mwah 💋 go read your registers responsibly. 🧚‍♀️💖