STRUCT TPMI_SST_STRUCT(9)

💖 struct tpmi_sst_struct(9) 💖

okay so bestie, welcome to the Kernel API Manual — this little page is all about the struct tpmi_sst_struct and honestly it's giving "glorified filing cabinet" energy, but in the best way 🫶

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✨ NAME ✨

struct tpmi_sst_struct — literally just a place to store sst info for a package. That's it. That's the whole job. 💅

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🌸 SYNOPSIS 🌸

struct tpmi_sst_struct {
    int package_id;
    struct tpmi_per_power_domain_info
*power_domain_info[SST_MAX_PARTITIONS];
    u16 cdie_mask[SST_MAX_PARTITIONS];
    u8 number_of_power_domains[SST_MAX_PARTITIONS];
    u8 io_dies[SST_MAX_PARTITIONS];
    u8 partition_mask;
    u8 partition_mask_current;
 };

copy it exactly, bestie — don't get creative in here, this is a struct not a vision board 😌

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🎀 Members 🎀

• package_id — the package id for this aux device instance. like a little name tag for your package 🏷️
• power_domain_info — pointer to power domains information. it's a pointer, it's pointing, it's doing its thing ✨
• cdie_mask — mask of compute dies present in a partition, straight from the hardware. ⚠️ but heads up: this mask is not present in the version 1 information header. so if you're on v1, don't go looking for it, she's not there 🙈
• number_of_power_domains — how many power_domains the power_domain_info pointer is pointing at. just a count, nothing dramatic 💅
• io_dies — number of IO dies in a partition. for TPMI version 1 information header this will be 0. zero. nada. 🫥
• partition_mask — mask of all the partitions. all of them 👑
• partition_mask_current — the current partition mask, because some of them may have been unbound. yeah, some definitely dipped 😭

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🦋 Description 🦋

this struct is used to store the full SST information for a package, periodt. each package has one or multiple OOB PCI devices, and each package can contain multiple power domains. that's the whole vibe — one struct holding the full picture so nobody has to go digging around later 💖

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🌈 SEE ALSO 🌈

• Kernel file ./drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c — that's where the lore lives 📂
• struct sst_header(9)
• struct cp_header(9)
• struct pp_header(9)
• struct feature_offset(9)
• struct levels_offset(9)
• struct pp_control_offset(9)
• struct pp_status_offset(9)
• struct perf_level(9)
• struct tpmi_per_power_domain_info(9)
• struct tpmi_sst_common_struct(9)
• map_cdies(9)
• map_partition_power_domain_id(9)

like, read the whole friend group, they all know each other iykyk 🔥

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lowkey reminder bestie: this came out of ./drivers/platform/x86/intel/s... and the page is dated October 2026, all under the name struct tpmi_sst_struct(9) 💜 ngl that's the whole sign-off, slay, go read some kernel source 🧚‍♀️⭐