lpfc_idiag_pcicfg_write(9)

📦 version 7.3.1, in nixpkgs unstable

💅 lpfc_idiag_pcicfg_write(9) 💅

okay so bestie, welcome to the Kernel API Manual page for lpfc_idiag_pcicfg_write — yes that's a mouthful, yes it's iconic, and yes we're gonna get through it together 🫶

✨ NAME ✨

lpfc_idiag_pcicfg_write — syntax check and set up idiag pcicfg commands. that's the whole vibe. she checks your syntax, she sets things up. main character energy fr ✨

🎀 SYNOPSIS 🎀

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

🌸 ARGUMENTS 🌸

  • file — the file pointer to read from. that's your entry point, your moment, your file 💖
  • buf — the buffer to copy the user data from. all the user data lives here, we're literally just copying from it 🦋
  • nbytes — the number of bytes to get. counting is important, bestie, don't skip it ✨
  • ppos — the position in the file to start reading from. like a bookmark but for a file, lowkey genius 💅

🔥 DESCRIPTION 🔥

so here's the tea — this routine gets the debugfs idiag command struct from user space, and then it performs the syntax check for the PCI config space read or write command accordingly. depending on which one you're doing 👑

in the case of a PCI config space read command, it sets up the command in the idiag command struct for the debugfs read operation. no actual config space touching yet, it's just getting ready, like doing your skincare before the event 🧖

in the case of a PCI config space write operation, it executes the write operation into the PCI config space accordingly. she's not playing around, she's actually writing 🔥

and when it's successful, it returns the nbytges passing in from debugfs user space. yes, nbytges. that's what it says. we don't know why. we don't ask. we love her 💀 (it means the bytes, bestie, don't panic)

in case of error conditions, it returns proper error code back to the user space. no silent failures here, she's honest with you 🙈

🌈 SEE ALSO 🌈

kernel file ./drivers/scsi/lpfc/lpfc_debugfs.c

and like. a whole friend group of functions. every single one of them, we're not leaving anyone out, everyone gets an invite to the group chat 💜

okay that's the whole page, you ate that, slay 🎀 this came from ./drivers/scsi/lpfc, dated October 2026 — mark your calendars bestie, and go read some PCI config space 💜✨

📦 where this page comes from