lpfc_idiag_open(9)

💖 NAME 💖

lpfc_idiag_open — the idiag open debugfs one, and yes that's the whole name, no notes 💅

Oh and hi, quick vibe check: we're in section 9 of the Kernel API Manual, which is exactly where you'd expect to find her. 🎀

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✨ SYNOPSIS ✨

int lpfc_idiag_open (struct inode *inode , struct file *file );

(yes the space before the comma is real, don't come for me, that's literally how she's written 🫶)

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🎀 ARGUMENTS 🎀

• inode — the inode pointer, and bestie she's load-bearing: she holds a pointer to phba inside her. iconic of her honestly.
• file — the file pointer, aka the thing we're gonna attach the file operation to 🌸

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🦋 DESCRIPTION 🦋

Okay so. This routine is the entry point for the debugfs open file operation. First thing she does? She gets the reference to phba from the i_private field in inode. Slay, easy.

Then she allocates a buffer for the file operation. Not done yet though — next she performs the necessary PCI config space read into that allocated buffer, in accordance with the idiag user command setup. So it's not just "here's a buffer", it's "here's a buffer and it's got purpose" 😌

And finally she returns a pointer to that buffer in the private_data field in file. Little handoff moment, we love to see it 🫶

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👑 RETURN 👑

She returns zero if everything's successful. If it goes sideways, she returns a negative error value — so like, negative numbers are bad news, keep that in mind. 😭

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🌈 SEE ALSO 🌈

Kernel file: ./drivers/scsi/lpfc/lpfc_debugfs.c

Now the friend group, and she has a big friend group, we're listing every single one because nobody gets left out 💜:

• lpfc_debugfs_disc_trc_data(9)
• lpfc_debugfs_slow_ring_trc_data(9)
• lpfc_debugfs_hbqinfo_data(9)
• lpfc_debugfs_commonxripools_data(9)
• lpfc_debugfs_multixripools_data(9)
• lpfc_debugfs_lockstat_data(9)
• lpfc_debugfs_dumpHBASlim_data(9)
• lpfc_debugfs_dumpHostSlim_data(9)
• lpfc_debugfs_nodelist_data(9)
• lpfc_debugfs_nvmestat_data(9)
• lpfc_debugfs_scsistat_data(9)
• lpfc_debugfs_ioktime_data(9)
• lpfc_debugfs_nvmeio_trc_data(9)
• lpfc_debugfs_hdwqstat_data(9)
• lpfc_debugfs_disc_trc(9)
• lpfc_debugfs_slow_ring_trc(9)
• lpfc_debugfs_nvme_trc(9)
• lpfc_debugfs_disc_trc_open(9)
• lpfc_debugfs_slow_ring_trc_open(9)
• lpfc_debugfs_hbqinfo_open(9)
• lpfc_debugfs_multixripools_open(9)
• lpfc_debugfs_lockstat_open(9)
• lpfc_debugfs_ras_log_open(9)
• lpfc_debugfs_dumpHBASlim_open(9)
• lpfc_debugfs_dumpHostSlim_open(9)
• lpfc_debugfs_nodelist_open(9)
• lpfc_debugfs_lseek(9)
• lpfc_debugfs_read(9)
• lpfc_debugfs_release(9)
• lpfc_debugfs_multixripools_write(9)
• lpfc_idiag_cmd_get(9)
• lpfc_idiag_release(9)
• lpfc_idiag_cmd_release(9)
• lpfc_idiag_pcicfg_read(9)
• lpfc_idiag_pcicfg_write(9)
• lpfc_idiag_baracc_read(9)
• lpfc_idiag_baracc_write(9)
• lpfc_idiag_queinfo_read(9)
• lpfc_idiag_que_param_check(9)
• lpfc_idiag_queacc_read_qe(9)
• lpfc_idiag_queacc_read(9)
• lpfc_idiag_queacc_write(9)
• lpfc_idiag_drbacc_read_reg(9)
• lpfc_idiag_drbacc_read(9)
• lpfc_idiag_drbacc_write(9)
• lpfc_idiag_ctlacc_read_reg(9)
• lpfc_idiag_ctlacc_read(9)
• lpfc_idiag_ctlacc_write(9)
• lpfc_idiag_mbxacc_get_setup(9)
• lpfc_idiag_mbxacc_read(9)
• lpfc_idiag_mbxacc_write(9)
• lpfc_idiag_extacc_avail_get(9)
• lpfc_idiag_extacc_alloc_get(9)
• lpfc_idiag_extacc_drivr_get(9)
• lpfc_idiag_extacc_write(9)
• lpfc_idiag_extacc_read(9)
• lpfc_debugfs_initialize(9)
• lpfc_debugfs_terminate(9)
• lpfc_debug_dump_all_queues(9)

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and that's the whole page bestie, no cap, every flag and function accounted for ✨

sign-off szn: this one lives in ./drivers/scsi/lpfc and it's dated October 2026 — so she's from the future and still slaying 💜🦋🎀 go read the source, ily, bye 🫶