GUC2VF_RELAY_FROM_PF(9)

💅 GUC2VF_RELAY_FROM_PF(9) 💅

okay bestie, welcome to the Kernel API Manual — this page is all about GUC2VF_RELAY_FROM_PF, and it is literally the message the GuC firmware uses to deliver Relay Message_ from the Physical Function (PF) driver to this Virtual Function (VF) driver. See GuC Relay Communication_ for details. 🫶

This message is always sent over CTB. no exceptions, periodt. 💅

the bit layout is giving:

Bits   Description
0    | 31    | ORIGIN = GUC_HXG_ORIGIN_GUC_
     | 30:28 | TYPE = GUC_HXG_TYPE_EVENT_
     | 27:16 | MBZ
     | 15:0  | ACTION = _`XE_GUC_ACTION_GUC2VF_RELAY_FROM_PF` = 0x5102

then the relay fields roll in like:

• 1, bits 31:0 — RELAY_ID — VF/PF message ID
• 2, bits 31:0 — RELAY_DATA1
• ...
• n, bits 31:0 — RELAY_DATAx

🔍 SEE ALSO 🔍

the kernel file is right here, bestie: ./drivers/gpu/drm/xe/abi/guc_actions_sriov_abi.h

• GUC2PF_RELAY_FROM_VF(9)
• PF2GUC_RELAY_TO_VF(9)
• VF2GUC_RELAY_TO_PF(9)
• GUC2PF_ADVERSE_EVENT(9)
• GUC2PF_VF_STATE_NOTIFY(9)
• VF2GUC_MATCH_VERSION(9)
• PF2GUC_UPDATE_VGT_POLICY(9)
• PF2GUC_UPDATE_VF_CFG(9)
• PF2GUC_VF_CONTROL(9)
• VF2GUC_VF_RESET(9)
• VF2GUC_RESFIX_DONE(9)
• VF2GUC_QUERY_SINGLE_KLV(9)
• PF2GUC_SAVE_RESTORE_VF(9)
• VF2GUC_RESFIX_START(9)

xoxo 💋 this one comes from ./drivers/gpu/drm/xe/abi, dated October 2026 — and yeah, it’s the GUC2VF_RELAY_FROM_PF(9) page from the Kernel API Manual. 🎀