STRUCT ETM_DRVDATA(9)

🎀 struct etm_drvdata(9) 🎀

welcome to the Kernel API Manual, bestie — this page is all about the specifics associated to an ETM component, and it’s giving “struct full of core details” energy 💖

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🌸 NAME 🌸

struct etm_drvdata — the specifics associated to an ETM component ✨

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✨ SYNOPSIS ✨

okay so here’s the exact shape, no cap:

struct etm_drvdata {
    struct csdev_access             csa;
    struct clk                      *atclk;
    struct coresight_device         *csdev;
    spinlock_t spinlock;
    int cpu;
    int port_size;
    u8 arch;
    bool use_cp14;
    bool sticky_enable;
    bool boot_enable;
    bool os_unlock;
    u8 nr_addr_cmp;
    u8 nr_cntr;
    u8 nr_ext_inp;
    u8 nr_ext_out;
    u8 nr_ctxid_cmp;
    u32 etmccr;
    u32 etmccer;
    u32 traceid;
    struct etm_config               config;
};

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🫶 Members 🫶

• atclk — optional clock for the core parts of the ETM. optional clock, iconic behavior.
• csdev — component vitals needed by the framework. the framework’s essentials, fr.
• spinlock — only one at a time pls. no sharing, bestie 💅
• cpu — the cpu this component is affined to.
• port_size — port size as reported by ETMCR bit 4-6 and 21.
• arch — ETM/PTM version number.
• sticky_enable — true if ETM base configuration has been done.
• boot_enable — true if we should start tracing at boot time.
• os_unlock — true if access to management registers is allowed.
• nr_addr_cmp — Number of pairs of address comparators as found in ETMCCR.
• nr_cntr — Number of counters as found in ETMCCR bit 13-15.
• nr_ext_inp — Number of external input as found in ETMCCR bit 17-19.
• nr_ext_out — Number of external output as found in ETMCCR bit 20-22.
• nr_ctxid_cmp — Number of contextID comparators as found in ETMCCR bit 24-25.
• etmccr — value of register ETMCCR.
• etmccer — value of register ETMCCER.
• traceid — value of the current ID for this component.
• config — structure holding configuration parameters.

tiny note: csa and use_cp14 are in the struct above, but the original Members list doesn’t give them their own blurbs — so I’m not inventing lore, bestie 😌

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🔎 SEE ALSO 🔎

• Kernel file ./drivers/hwtracing/coresight/coresight-etm.h
• struct etm_config(9)

go read those next, iykyk 💜

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xoxo from ./drivers/hwtracing/coresight — October 2026 edition, bye bestie 💅🎀