STRUCT XE_PAT_TABLE_ENTRY(9)

✨ NAME ✨

struct xe_pat_table_entry — bestie, this is literally the pat_index encoding plus all its little meta info besties 🎀 (yes, this whole page lives in the Kernel API Manual, and it's giving "I have one job and I slay it") 💅

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🦋 SYNOPSIS 🦋

okay so here's the whole struct, no cap, exactly as it is:

struct xe_pat_table_entry {
    u32 value;
  #define XE_COH_NONE             1;
  #define XE_COH_1WAY             2;
  #define XE_COH_2WAY             3;
    u16 coh_mode;
    u16 valid;
 };

like… look at her. iconic. ✨

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🌸 Members 🌸

• value — the platform specific value that encodes the various memory attributes (this maps to some fixed pat_index). so like caching, coherency, compression etc etc can all be encoded right here. it's giving "one field, many secrets" 🔥
• coh_mode — the GPU coherency mode that value maps to. and the modes are these, verbatim:
  • XE_COH_NONE — 1;
  • XE_COH_1WAY — 2;
  • XE_COH_2WAY — 3;

ngl the one-way vs two-way coherency thing is a whole vibe check of its own 💀

• valid — set to 1 if the entry is valid, 0 if it's reserved. that's it. that's the whole field. simple queen 👑

🫶 tiny reminder bestie: value is platform specific, so don't go assuming the encoding is the same everywhere — the struct is the stable part, the bits are not. iykyk.

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🔥 SEE ALSO 🔥

• Kernel file ./drivers/gpu/drm/xe/xe_pat.h
• xe_pat_init_early(9)
• xe_pat_init(9)
• xe_pat_index_get_coh_mode(9)
• xe_pat_index_get_comp_en(9)
• xe_pat_index_get_l3_policy(9)

go read those next, they're lowkey the sequel era of this page 📚✨

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aaaand that's the whole thing! 💖 this page came from ./drivers/gpu/drm/xe, dated October 2026, and it's filed under Kernel API Manual — so like, five years from now when you're googling this again, you know exactly where to find her. periodt. 👑🌈⭐