STRUCT PSIL_ENDPOINT_CONFIG(9)

✨ NAME ✨

struct psil_endpoint_config — the PSI-L Endpoint configuration, bestie 💅

Ok so real talk, this is a page out of the Kernel API Manual, and it's all about that one lil struct that tells the kernel how a PSI-L endpoint should behave. No cap, it's giving "control panel for one endpoint" energy 🎀

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🌸 SYNOPSIS 🌸

Here's the whole thing, laid out exactly how it lives in the source:

struct psil_endpoint_config {
    enum psil_endpoint_type ep_type;
    enum udma_tp_level channel_tpl;
    unsigned pkt_mode:1;
    unsigned notdpkt:1;
    unsigned needs_epib:1;
    unsigned pdma_acc32:1;
    unsigned pdma_burst:1;
    u32 psd_size;
    s16 mapped_channel_id;
    u16 flow_start;
    u16 flow_num;
    s16 default_flow_id;
 };

Notice the bitfields? pkt_mode, notdpkt, needs_epib, pdma_acc32 and pdma_burst are all :1 — one bit each, living their tiny icon era 🧚

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👑 Members 👑

The members, one by one, fr fr

• ep_type — the PSI-L endpoint type. It's literally the whole personality of the endpoint ✨
• channel_tpl — the desired throughput level for the channel. Think of it as the endpoint's ambition 💖
• pkt_mode — if this one's set, the channel must be in Packet mode; if it's not set, the channel is in TR mode instead. No in-between, babe.
• notdpkt — TDCM must be suppressed on the TX channel. Yep. That's the whole vibe.
• needs_epib — the endpoint needs EPIB. Simple as that 🫶
• pdma_acc32 — ACC32 must be enabled on the PDMA side. Not optional, that's the rule.
• pdma_burst — BURST must be enabled on the PDMA side. Same energy, different bit ⭐
• psd_size — if it's set, PSdata is used by the endpoint 🌸
• mapped_channel_id — the PKTDMA thread-to-channel mapping for mapped channels. The lowkey important part: the thread must be serviced by the specified channel if mapped_channel_id is >= 0, in the case of PKTDMA 🔥
• flow_start — the PKDMA flow range start of the mapped channel. Heads up: unmapped channels use flow_id == chan_id 💀
• flow_num — the PKDMA flow count of the mapped channel. And again, for the people in the back: unmapped channels use flow_id == chan_id
• default_flow_id — the PKDMA default (r)flow index of the mapped channel. It must be within the flow range of the mapped channel — that's a hard requirement, not a suggestion, ok? 🙈

Also just so you're not confused later: yes, the original really does spell it PKTDMA in one spot and PKDMA in the others. That's not me being sloppy, that's just how it's written 💜

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🦋 SEE ALSO 🦋

Go check these out, they're the friends of this page:

• The kernel file ./include/linux/dma/k3-psil.h
• enum udma_tp_level(9)
• enum psil_endpoint_type(9)

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And that's the whole page, bestie — you ate that 💅✨

Cute lil sign-off: this one lives under ./include/linux/dma, and it's stamped October 2026. Periodt 🎀🌈