STRUCT CPPI5_TR_TYPE15_T(9)

💅 struct cppi5_tr_type15_t(9) — Kernel API Manual vibes

okay bestie, pull up a chair, because this is the struct cppi5_tr_type15_t(9) page from the Kernel API Manual and honestly? she's a big one. Type 15 — aka Four Dimensional Block Copy with Repacking and Indirection Support — and she's a 64 byte TR. yes, sixty-four. no cap. 🎀

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✨ NAME ✨

struct cppi5_tr_type15_t — the Type 15 (Four Dimensional Block Copy with Repacking and Indirection Support) TR, and she is 64 byte. iconic behavior honestly 💅

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🌸 SYNOPSIS 🌸

like, here's the whole struct, exactly as she is, no edits, we don't do that here:

struct cppi5_tr_type15_t {
    cppi5_tr_flags_t flags;
    u16 icnt0;
    u16 icnt1;
    u64 addr;
    s32 dim1;
    u16 icnt2;
    u16 icnt3;
    s32 dim2;
    s32 dim3;
    u32 _reserved;
    s32 ddim1;
    u64 daddr;
    s32 ddim2;
    s32 ddim3;
    u16 dicnt0;
    u16 dicnt1;
    u16 dicnt2;
    u16 dicnt3;
 };

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🦋 Members 🦋

okay so member by member, because every single one matters and we are NOT skipping any:

💖 the source side

• flags — the TR flags, bestie: type, triggers, event, configuration. she's giving main character energy at the top of the struct ✨
• icnt0 — total loop iteration count for level 0 (innermost) for source
• icnt1 — total loop iteration count for level 1 for source
• addr — starting address for the source data
• dim1 — signed dimension for loop level 1 for source
• icnt2 — total loop iteration count for level 2 for source
• icnt3 — total loop iteration count for level 3 (outermost) for source
• dim2 — signed dimension for loop level 2 for source
• dim3 — signed dimension for loop level 3 for source

🧚 the little gap

• _reserved — not used. that's it. that's the whole vibe. she's just sitting there 🫶

💜 the destination side (yes, she has a whole second personality)

• ddim1 — signed dimension for loop level 1 for destination
• daddr — starting address for the destination data
• ddim2 — signed dimension for loop level 2 for destination
• ddim3 — signed dimension for loop level 3 for destination
• dicnt0 — total loop iteration count for level 0 (innermost) for destination
• dicnt1 — total loop iteration count for level 1 for destination
• dicnt2 — total loop iteration count for level 2 for destination
• dicnt3 — total loop iteration count for level 3 (outermost) for destination

ngl the pattern here is lowkey everything comes in a source flavor and a destination flavor. source lives with i/dim/addr, destination has the extra d prefix — ddim, daddr, dicnt. once you clock that, the whole struct eats. 🔥

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💀 SEE ALSO 💀

the full squad, all of them, because leaving one out would be so rude:

Kernel file ./include/linux/dma/ti-cppi5.h

• struct cppi5_desc_hdr_t(9)
• struct cppi5_host_desc_t(9)
• struct cppi5_desc_epib_t(9)
• struct cppi5_monolithic_desc_t(9)
• cppi5_desc_is_tdcm(9)
• cppi5_desc_get_type(9)
• cppi5_desc_get_errflags(9)
• cppi5_desc_get_pktids(9)
• cppi5_desc_set_pktids(9)
• cppi5_desc_set_retpolicy(9)
• cppi5_desc_get_tags_ids(9)
• cppi5_desc_set_tags_ids(9)
• cppi5_hdesc_calc_size(9)
• cppi5_hdesc_init(9)
• cppi5_hdesc_update_flags(9)
• cppi5_hdesc_update_psdata_size(9)
• cppi5_hdesc_get_psdata_size(9)
• cppi5_hdesc_get_pktlen(9)
• cppi5_hdesc_set_pktlen(9)
• cppi5_hdesc_get_psflags(9)
• cppi5_hdesc_set_psflags(9)
• cppi5_hdesc_get_pkttype(9)
• cppi5_hdesc_set_pkttype(9)
• cppi5_hdesc_attach_buf(9)
• cppi5_hdesc_link_hbdesc(9)
• cppi5_hdesc_epib_present(9)
• cppi5_hdesc_get_psdata(9)
• cppi5_hdesc_get_swdata(9)
• enum cppi5_tr_types(9)
• enum cppi5_tr_event_size(9)
• enum cppi5_tr_trigger(9)
• enum cppi5_tr_trigger_type(9)
• struct cppi5_tr_type0_t(9)
• struct cppi5_tr_type1_t(9)
• struct cppi5_tr_type2_t(9)
• struct cppi5_tr_type3_t(9)
• struct cppi5_tr_resp_t(9)
• enum cppi5_tr_resp_status_type(9)
• enum cppi5_tr_resp_status_submission(9)
• enum cppi5_tr_resp_status_unsupported(9)
• cppi5_trdesc_calc_size(9)
• cppi5_trdesc_init(9)
• cppi5_tr_init(9)
• cppi5_tr_set_trigger(9)
• cppi5_tr_csf_set(9)

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and that's the page, bestie! 🌈 shoutout to the source, ./include/linux/dma, dated October 2026, and we're closing out on struct cppi5_tr_type15_t(9) — go be a 64-byte icon, ily 🎀💖✨