lpfc_idiag_baracc_read(9)

💖 NAME 💖

okay bestie, welcome to the lpfc_idiag_baracc_read(9) page, folded all cute and cozy into the Kernel API Manual so we can get straight to it. The name is lpfc_idiag_baracc_read, and the one-line vibe is idiag debugfs pci bar access read. ✨

✨ SYNOPSIS ✨

ssize_t lpfc_idiag_baracc_read (struct file *file , char __user *buf ,
       size_t nbytes , loff_t *ppos );

🎀 ARGUMENTS 🎀

• file — the file pointer to read from. 📂
• buf — the buffer to copy the data to. 💌
• nbytes — the number of bytes to read. 🔢
• ppos — the position in the file to start reading from. 📍

🦋 DESCRIPTION 🦋

This routine reads data from the phba pci bar memory mapped space according to the idiag command, and copies to user buf. That's literally the whole story: it's giving "read the bar, follow the idiag command, send the data over to the user buffer." 🫶

🌸 RETURN 🌸

The return value is the amount of data that was read — and yes, bestie, that could be less than nbytes if the end of the file was reached 😭 — or a negative error value. Periodt.

👀 SEE ALSO 👀

First up, the Kernel file:

• ./drivers/scsi/lpfc/lpfc_debugfs.c — the Kernel file reference. 🧚

Then the whole friend group:

• 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_open(9)
• lpfc_idiag_release(9)
• lpfc_idiag_cmd_release(9)
• lpfc_idiag_pcicfg_read(9)
• lpfc_idiag_pcicfg_write(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)

cute sign-off 🎀: the source/version is ./drivers/scsi/lpfc, the date is October 2026, and the page tag is lpfc_idiag_baracc_read(9). byeee bestie 💅