STRUCT ISST_IF_IO_REGS(9)

💖 NAME 💖

okay bestie, welcome to the struct isst_if_io_regs(9) page from the Kernel API Manual ✨ — this is literally the structure for IO register commands, no cap 💅.

✨ SYNOPSIS ✨

       struct isst_if_io_regs {
           __u32 req_count;
           struct isst_if_io_reg io_reg[1];
        };

🫶 Members 🫶

• req_count — the number of io reg commands chilling in io_reg[] 💖
• io_reg — holds one or more io_reg command structures 🎀

🌸 Description 🌸

bestie, you use this struct with the ISST_IF_IO_CMD ioctl to send one or more read/write commands to PUNIT 👑. The IOCTL return value is giving “number of requests sent” or “error number if no requests have been sent” — that’s the whole vibe check 😭.

important: the IOCTL return value here is not just success/fail — it tells you how many requests got sent, or an error number when none got sent. periodt 💀.

🔥 SEE ALSO 🔥

• Kernel file: ./include/uapi/linux/isst_if.h
• struct isst_if_platform_info(9)
• struct isst_if_cpu_map(9)
• struct isst_if_cpu_maps(9)
• struct isst_if_io_reg(9)
• struct isst_if_mbox_cmd(9)
• struct isst_if_mbox_cmds(9)
• struct isst_if_msr_cmd(9)
• struct isst_if_msr_cmds(9)
• struct isst_core_power(9)
• struct isst_clos_param(9)
• struct isst_if_clos_assoc(9)
• struct isst_if_clos_assoc_cmds(9)
• struct isst_tpmi_instance_count(9)
• struct isst_perf_level_info(9)
• struct isst_perf_level_control(9)
• struct isst_perf_feature_control(9)
• struct isst_perf_level_data_info(9)
• struct isst_perf_level_fabric_info(9)
• struct isst_perf_level_cpu_mask(9)
• struct isst_base_freq_info(9)
• struct isst_turbo_freq_info(9)

kisses bestie 🫶 — this one’s sourced from ./include/uapi/linux, dated October 2026, and the page is literally struct isst_if_io_regs(9) 💅