megasas_writ...bit_req_desc(9)

💅 NAME 💅

okay so welcome to the Kernel API Manual, bestie — this page is all about megasas_write_64bit_req_desc, which, and I cannot stress this enough, is the function where PCI writes the 64bit request descriptor. that's it. that's the whole name. it's giving "does exactly what it says on the tin" ✨

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🌸 SYNOPSIS 🌸

void megasas_write_64bit_req_desc (struct megasas_instance *instance ,
union MEGASAS_REQUEST_DESCRIPTOR_UNION *req_desc );

like, yes, that's a void returning function with two params and one of them is a union — she's lowkey fancy, no cap 🫶

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🎀 ARGUMENTS 🎀

bestie you literally cannot call this without knowing what goes in, so:

• instance — the adapter soft state 🦋 (yes, the whole soft-state vibe for the adapter, hand it over)
• req_desc — the 64bit request descriptor 💖 (the actual 64-bit descriptor being written, main character energy fr)

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👑 SEE ALSO 👑

okay so this is the part where I list literally everyone in the group chat, because this function does not run alone. first up, the kernel file itself:

./drivers/scsi/megaraid/megaraid_sas_fusion.c

and now the full crew — every single one of these (9) pages, not skipping a single one, periodt:

• megasas_adp_reset_wait_for_ready(9)
• megasas_check_same_4gb_region(9)
• megasas_enable_intr_fusion(9)
• megasas_disable_intr_fusion(9)
• megasas_get_cmd_fusion(9)
• megasas_return_cmd_fusion(9)
• megasas_fire_cmd_fusion(9)
• megasas_fusion_update_can_queue(9)
• megasas_free_cmds_fusion(9)
• megasas_create_sg_sense_fusion(9)
• megasas_alloc_cmds_fusion(9)
• wait_and_poll(9)
• megasas_ioc_init_fusion(9)
• megasas_sync_pd_seq_num(9)
• megasas_allocate_raid_maps(9)
• megasas_configure_queue_sizes(9)
• megasas_free_ioc_init_cmd(9)
• megasas_init_adapter_fusion(9)
• megasas_fault_detect_work(9)
• map_cmd_status(9)
• megasas_is_prp_possible(9)
• megasas_make_prp_nvme(9)
• megasas_make_sgl_fusion(9)
• megasas_make_sgl(9)
• megasas_set_pd_lba(9)
• megasas_stream_detect(9)
• megasas_set_raidflag_cpu_affinity(9)
• megasas_build_ldio_fusion(9)
• megasas_build_ld_nonrw_fusion(9)
• megasas_build_syspd_fusion(9)
• megasas_build_io_fusion(9)
• megasas_build_and_issue_cmd_fusion(9)
• megasas_complete_r1_command(9)
• access_irq_context(9)
• release_irq_context(9)
• complete_cmd_fusion(9)
• megasas_enable_irq_poll(9)
• megasas_sync_irqs(9)
• megasas_irqpoll(9)
• megasas_complete_cmd_dpc_fusion(9)
• megasas_isr_fusion(9)
• build_mpt_mfi_pass_thru(9)
• build_mpt_cmd(9)
• megasas_issue_dcmd_fusion(9)
• megasas_release_fusion(9)
• megasas_read_fw_status_reg_fusion(9)
• megasas_alloc_host_crash_buffer(9)
• megasas_free_host_crash_buffer(9)
• megasas_adp_reset_fusion(9)
• megasas_check_reset_fusion(9)
• megasas_trigger_snap_dump(9)
• megasas_tm_response_code(9)
• megasas_issue_tm(9)

iykyk 💀 that's the whole fusion friend group and yes I typed every last one, you're welcome 🍓

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ngl there are no options, no env vars, no exit statuses, no signals, no examples and no known bugs on this page — it's a short one, and that's on purpose. don't go looking for drama that isn't there 🙈

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and that's a wrap, babe 🧚 this little masterpiece lives in ./drivers/scsi/megaraid, dated October 2026, and answers to the name megasas_writ...bit_req_desc(9) — go forth and slay your 64-bit descriptors 💜🔥