SBRMI_IOCTL_CPUID_CMD(9)

✨ SBRMI_IOCTL_CPUID_CMD ✨

okay so bestie, you’ve landed on the SBRMI_IOCTL_CPUID_CMD page in the Kernel API Manual — section 9, iykyk 💅. This is the manual name folded in right at the top, and we’re about to make these APML ioctl vibes make sense. 🦋

🌸 Parameters 🌸

• struct apml_cpuid_msg — a pointer to the struct apml_cpuid_msg that will contain the protocol information. 🫶

💖 Description 💖

okay so the main character here is the IOCTL command for APML messages using generic _IOWR. ✨ The IOCTL provides userspace access to the AMD sideband cpuid protocol, no cap. 👑

• CPUID protocol — to get CPU details for Function/Ext Function at thread level. 🌈
• returning "-EFAULT" if none of the above "-EPROTOTYPE" error is returned to provide additional error details. 😭

🫶 SEE ALSO 🫶

Kernel file: ./include/uapi/misc/amd-apml.h

• SBRMI_IOCTL_MBOX_CMD(9)
• SBRMI_IOCTL_MCAMSR_CMD(9)
• SBRMI_IOCTL_REG_XFER_CMD(9)
• SBTSI_IOCTL_REG_XFER_CMD(9)

xoxo from SBRMI_IOCTL_CPUID_CMD(9), sourced at ./include/uapi/misc, dated October 2026 — catch you in the kernel, bestie 💅💖