STRUCT UFS_EVENT_HIST(9)

✨ NAME ✨

okay so bestie, we're looking at struct ufs_event_hist(9) from the Kernel API Manual, and it is literally struct ufs_event_hist — keeps history of errors. That's the whole assignment. It's giving "receipts, but for kernel errors" 💅.

🌸 SYNOPSIS 🌸

the shape of this icon is exactly this, no cap:

struct ufs_event_hist {
    int pos;
    u32 val[UFS_EVENT_HIST_LENGTH];
    u64 tstamp[UFS_EVENT_HIST_LENGTH];
    unsigned long long cnt;
 };

🎀 Members 🎀

• pos — index to indicate cyclic buffer position. it's the "you are here" marker for the little loop-de-loop buffer 🌀.
• val — cyclic buffer for registers value. register values get their own rotating spot ✨.
• tstamp — cyclic buffer for time stamp. time stamps, but make it cyclic 🕰️.
• cnt — error counter. it counts the errors, bestie. iconic behaviour, honestly 💀.

💜 SEE ALSO 💜

the kernel file is ./include/ufs/ufshcd.h, and the whole see-also squad is right here — every single one, no skipping:

• struct uic_command(9)
• struct ufshcd_lrb(9)
• struct ufs_query_req(9)
• struct ufs_query_res(9)
• struct ufs_query(9)
• struct ufs_dev_cmd(9)
• struct ufs_clk_info(9)
• struct tx_eqtr_iter(9)
• struct ufshcd_tx_eq_settings(9)
• struct ufshcd_tx_eqtr_data(9)
• struct ufshcd_tx_eqtr_record(9)
• struct ufshcd_tx_eq_params(9)
• struct ufs_hba_variant_ops(9)
• struct ufs_clk_gating(9)
• struct ufs_clk_scaling(9)
• struct ufs_stats(9)
• enum ufshcd_state(9)
• enum ufshcd_pmc_policy(9)
• struct ufshcd_mcq_opr_info_t(9)
• struct ufs_hba(9)
• struct ufs_hw_queue(9)
• ufshcd_rmwl(9)
• ufshcd_set_variant(9)
• ufshcd_get_variant(9)

xoxo, signing off from source ./include/ufs, dated October 2026 — bye bestie, mwah 💋🫶