STRUCT CMB_DATASET(9)

💖 struct cmb_dataset(9) 💖

okay so real talk — this is a page straight out of the Kernel API Manual, and it's lowkey just here to tell you what shape struct cmb_dataset has. no flowery intro, no lore, we're going straight to the vibes. 🫶

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✨ NAME ✨

struct cmb_dataset — and bestie, the description field is literally empty on the original page. not me ghosting you, that's just how it's printed. 💀 a mystery, an icon, a blank space.

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🌸 SYNOPSIS 🌸

here's the whole struct, copied exactly, no cap, not one character changed:

struct cmb_dataset {
    u32 trace_mode;
    u32 patt_val[TPDM_CMB_MAX_PATT];
    u32 patt_mask[TPDM_CMB_MAX_PATT];
    u32 trig_patt[TPDM_CMB_MAX_PATT];
    u32 trig_patt_mask[TPDM_CMB_MAX_PATT];
    u32 msr[TPDM_CMB_MAX_MSR];
    bool patt_ts;
    bool trig_ts;
    bool ts_all;
    struct {
      u8 trig_lane;
      u8 lane_select;
    } mcmb;
 };

like… she's got arrays, she's got bools, she's got a nested anonymous struct. main character energy fr fr. 👑

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🦋 MEMBERS 🦋

every single one, in order, no skipping — that's the rule:

• trace_mode — the dataset collection mode. the whole mood of the dataset, basically. ✨
• patt_val — saves the value for the pattern.
• patt_mask — saves the value for the pattern mask.
• trig_patt — saves the value for the trigger pattern.
• trig_patt_mask — saves the value for the trigger pattern mask.
• msr — saves the value for the MSR. (in the original this one is squished right up against the line before it, iykyk 🙈)
• patt_ts — tells you if the pattern match for timestamp is enabled.
• trig_ts — tells you if the CTI trigger for timestamp is enabled.
• ts_all — tells you if the timestamp is enabled for all packets. 🎀
• mcmb — a nested struct with trig_lane and lane_select inside it. and then the original page just kind of… trails off with struct mcmb_dataset sitting there. iconic, honestly. that's the whole note. 💅

ngl, none of these have defaults listed and there's no "returns" section — this is a pure "here's the fields, go read the header" kind of situation. no invented lore from me, bestie. 🧚

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🔥 SEE ALSO 🔥

go touch grass in the kernel source, these are your next stops:

• the kernel file ./drivers/hwtracing/coresight/coresight-tpdm.h
• struct dsb_dataset(9)
• struct tpdm_drvdata(9)
• struct tpdm_dataset_attribute(9)

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and that's the page!! 🌈 it lives down in ./drivers/hwtracing/coresight, dated October 2026, and it's filed under struct cmb_dataset(9) — slay, go read the header, mwah 💜🍓