STRUCT PSIL_EP_MAP(9)

💅 struct psil_ep_map(9) — the Kernel API Manual glow-up

Okay bestie, sit down, because today's main character is struct psil_ep_map from the kernel API manual (struct psil_ep_map(9) if we're being formal, which we're not 💖). It's literally the little struct that holds your PSI-L thread ID configuration maps. Iconic. Let's get into it ✨

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🌸 NAME 🌸

struct psil_ep_map — PSI-L thread ID configuration maps. That's it, that's the vibe 🫶

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🎀 SYNOPSIS 🎀

No cap, here's the whole thing, copied exactly, don't @ me:

struct psil_ep_map {
    char *name;
    struct psil_ep  *src;
    int src_count;
    struct psil_ep  *dst;
    int dst_count;
 };

Look at her. Five fields. Perfectly balanced. ✨

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🦋 Members 🦋

• name — the name of the map, and the move here is to set it to the name of the SoC. Like, identity is important, she needs to know who she is 💅
• src — an array of source PSI-L thread configurations. The originals. The OGs 🌈
• src_count — how many entries are in the src array. Gotta know how many besties are in the group chat 🔥
• dst — an array of destination PSI-L thread configurations. Where things are headed, main character energy 👑
• dst_count — the number of entries in the dst array. Same deal, but for dst 🍓

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💀 Description 💀

Okay so here's the tea ☕ — in the case of a symmetric configuration for a matching src/dst thread (think 0x4400 and 0xc400, cute little mirror images of each other 🪞), only the src configuration can be present. That's allowed! You don't have to write both, bestie, nobody's forcing you 🙈

And if there's no dst configuration found, the code will literally go looking for (dst_thread_id & ~0x8000) to find the symmetric match. That's the lookup. That's the whole trick. She's resourceful like that 🧚

Fr fr though — remember this is about the symmetric case specifically. Don't go assuming it's a general fallback for everything, because it's not, and I refuse to let you embarrass yourself 💜

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⭐ SEE ALSO ⭐

• Kernel file ./drivers/dma/ti/k3-psil-priv.h — go read it, iykyk 📖

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aaaand that's the page, bestie 🎀 you absolutely ate this one, no crumbs. This little number lives over at ./drivers/dma/ti and it's dated October 2026, so mark your calendar and stan responsibly. bye bestie, slay 💖✨🦋