STRUCT PMC_DEV(9)

💅 NAME 💅

okay so bestie, welcome to struct pmc_dev — the pmc device structure, in the Kernel API Manual (that's section 9, the kernely one, iykyk). It's literally the vibe check for a power management controller device, and we're gonna go through it field by field, no cap. 🦋

---

✨ SYNOPSIS ✨

here's the whole struct, character for character, do not touch, she's perfect:

struct pmc_dev {
    struct pmc *pmcs[MAX_NUM_PMC];
    struct dentry *dbgfs_dir;
    struct platform_device *pdev;
    unsigned int crystal_freq;
    int pmc_xram_read_bit;
    struct mutex lock;
    u64 s0ix_counter;
    void (*suspend)(struct pmc_dev *pmcdev);
    int (*resume)(struct pmc_dev *pmcdev);
    u64 *pkgc_res_cnt;
    u8 num_of_pkgc;
    u32 die_c6_offset;
    struct telem_endpoint *pc_ep;
    struct telem_endpoint *punit_ep;
    struct pmc_info *regmap_list;
    const char **pkgc_ltr_blocker_counters;
    u32 pkgc_ltr_blocker_offset;
    const char **pkgc_blocker_counters;
    u32 pkgc_blocker_offset;
 };

---

🎀 Members 🎀

okay so here's the member-by-member tour. the ones below are the ones this page actually spells out for you — a few of the fields up there (pmcs, lock, die_c6_offset, pc_ep, punit_ep, regmap_list) are just vibing in the struct without a lil description on this page, and that's just how it is. 🙈

• dbgfs_dir — path to debugfs interface. that's the door to the debug filesystem, bestie. 💖
• pdev — pointer to platform_device struct. slay, a pointer to the platform device.
• crystal_freq — crystal frequency from cpuid. yes, from cpuid, she asked the CPU directly. ⭐
• pmc_xram_read_bit — flag to indicate whether PMC XRAM shadow registers used to read MPHY PG and PLL status are available. so: is the XRAM shadow-register route for reading MPHY PG and PLL status a thing or not. binary queen. 🎀
• s0ix_counter — S0ix residency (step adjusted). the residency number, already step-adjusted for you. 👑
• suspend — Function to perform platform specific suspend. platform does its own suspend thing. 😭
• resume — Function to perform platform specific resume. and the matching resume. 🌸
• pkgc_res_cnt — Array of PKGC residency counters. 🔥
• num_of_pkgc — Number of PKGC. that's how many PKGCs we're dealing with. fr fr. 💜
• pkgc_ltr_blocker_counters — Array of PKGC LTR blocker counters. 🫶
• pkgc_ltr_blocker_offset — Offset to PKGC LTR blockers in telemetry region. 🌈
• pkgc_blocker_counters — Array of PKGC blocker counters. ✨
• pkgc_blocker_offset — Offset to PKGC blocker in telemetry region. 🦋

---

🧚 Description 🧚

like, the whole entire point: pmc_dev contains info about power management controller device. that's it, that's the tea. one struct, all the PMC device info, main character energy. 💅

---

⭐ SEE ALSO ⭐

the crossover episode, bestie:

• Kernel file ./drivers/platform/x86/intel/pmc/core.h struct
• pmc_reg_map(9)
• struct pmc_info(9)
• struct pmc(9)
• struct pmc_dev_info(9)

---

ngl, go read those too, they're all part of the same friend group 🫶

okay bye bestie, mwah 💋 — this page lives at ./drivers/platform/x86/intel/pmc, dated October 2026, and it's struct pmc_dev(9) all the way down. 🍓