THE VF RESUME STATE MACHINE(9)

💖 The VF RESUME state machine(9) 💖

okay bestie, so this is a page straight out of the Kernel API Manual and it's literally just the glow-up era of the VF RESUME state machine — the whole flowchart of it, in all its ASCII-art glory. no cap, it's giving "my crush drew me a diagram on a napkin" energy and I am obsessed 💅

here's the vibe:

             (PAUSED)<-----------------<------------------------o
                |                                                        resume                                                      |                                                       ....V............................RESUME_WIP......            :                                              :        o
            :        o-------<-----busy                    :        |
            :       /                /                     :        |
            :       RESUME_SEND_RESUME ---failed--->--------o--->(RESUME_FAILED)
            :       /                                      :        |
            :    acked                rejected---->---------o--->(MISMATCH)
            :     /                                         :
            :....o..............o...............o.....o.....:
                 |              |               |             completed        flr            stop      restart-->(READY)
                 |              |               |
                 V         .....V.....    ......V.....
             (RESUMED)     : FLR_WIP :    : STOP_WIP :
                           :.........:    :..........:

like, the states are all in there — (PAUSED), RESUME_WIP, RESUME_SEND_RESUME, (RESUME_FAILED), (MISMATCH), (RESUMED), FLR_WIP, STOP_WIP, (READY) — and the transitions have their own little labels too (resume, busy, failed, acked, rejected, completed, flr, stop, restart). it's a whole journey fr fr 🦋

and if you want the full picture, not just this one slice? the page literally says: for the full state machine view, see The VF state machine_ ✨

🌸 SEE ALSO 🌸

okay so this source file is the main character here, no big deal:

Kernel file ./drivers/gpu/drm/xe/xe_gt_sriov_pf_control.c

and it wants you to go read all of these next (yes, all of them, bestie — we don't skip the reading list 🙈):

• The VF state machine(9)
• The VF PAUSE state machine(9)
• xe_gt_sriov_pf_control_pause_vf(9)
• xe_gt_sriov_pf_control_resume_vf(9)
• The VF SAVE state machine(9)
• xe_gt_sriov_pf_control_check_save_data_done(9)
• xe_gt_sriov_pf_control_check_save_failed(9)
• xe_gt_sriov_pf_control_process_save_data(9)
• xe_gt_sriov_pf_control_trigger_save_vf(9)
• xe_gt_sriov_pf_control_finish_save_vf(9)
• The VF RESTORE state machine(9)
• xe_gt_sriov_pf_control_check_restore_failed(9)
• xe_gt_sriov_pf_control_restore_data_done(9)
• xe_gt_sriov_pf_control_process_restore_data(9)
• xe_gt_sriov_pf_control_trigger_restore_vf(9)
• xe_gt_sriov_pf_control_finish_restore_vf(9)
• The VF STOP state machine(9)
• xe_gt_sriov_pf_control_stop_vf(9)
• The VF FLR state machine(9)
• xe_gt_sriov_pf_control_prepare_flr(9)
• xe_gt_sriov_pf_control_trigger_flr(9)
• xe_gt_sriov_pf_control_sync_flr(9)
• xe_gt_sriov_pf_control_wait_flr(9)
• The VF FLR Flow with GuC(9)
• xe_gt_sriov_pf_control_process_guc2pf(9)
• xe_gt_sriov_pf_control_init(9)
• xe_gt_sriov_pf_control_restart(9)

and that's the whole page, babe 🎀 massive shoutout to ./drivers/gpu/drm/xe, stamped October 2026, filed under The VF RESUME state machine(9) — go forth and trace your state transitions, ily, mwah 💋💜