vgsp: CONT-108 - sema_gl_mme_iram_gate_break (default 0) + sema_gl_mme_iram_gate_build (default 1) independently control the two gsp_phys_gr_mme_iram_gate() readback sites (poll-break ~28019, pre-doorbell builder ~20300; comment records r1374 healthy->FULL chronology + CONT-107 probe-park note) - TASK-1 SUPERSEDED: 'LOAD0 stall at slot 58' EXPLAINED+DISMISSED: no call to slot 58 exists (all 8 3D-raw windows CALL_MME_MACRO runs hit only lanes {0,2,34,39,40,48,51,57}; 0x39d0 CALL_MME_MACRO(58) ZERO times; SA complete MME-PRE-SA[57] entry=0x364 / [58] entry=0x3a3); word-exact: slot 57 = mmeCodeOGL_C597_LOAD_CONSTANT_BUFFER_BUG2548370 (63 instrs 0x364..0x3a2), slot 58 = mmeCodeOGL_C597_LOAD_CONSTANT_BUFFER_OFFSET (2 instrs 0x3a3..0x3a4); Mesa sim: slot-57 with real params ends after last instr 5/5 consumed -> next fetch 0x364+63=0x3a3 = observed pc = POST-COMPLETION FETCH POINTER not stalled LOAD0; INFO_EX=0x4 = DATA_FIFO_SIZE constant not exception; A/B VERDICT r1376 break=0 build=1 still wedges at first calls-bearing launch; r1377 BOTH SITES OFF still wedges but RECOVERS (WEDGE-RECOVER priv-error poison seen grfifo=0x1 self-cleared) -> debug-port readback NOT the wedge cause, wedge is IN THE FIRST WINDOW REPLAY ITSELF; FIRST NONZERO STORES r1377 output retirement wait 2/901 pages changed 214ms settled + GUEST-WIT retire 4/908 changed va=0x4500000 pa=0x5ac146000 pre=0x3fb2ca25c057d17b post=0x0 engine-authored writes; MME executed r1376 pc=931 ir=71cc0301,18c0034a,1c34238f; r1377 never started (pc_valid=0, gate off => no live promotion); GATE1 black - next: bisect wedge-causing window content at first window+live launch (r1377 config no readbacks): A/B keep_mask=0 nop_drop=all (ALL call runs dropped) vs default; wedge gone => executed macros' emitted methods (0x2390/0x34a4 CB writes) park FE; persists => non-call families (SURF-PRELUDE/SHADER-EXC 0x1528/SPH-REGION/SA-REARM) then bisect win_drop families; follow-up readback-free live-promotion trigger (MME pc!=0 witness) - SESSION 153 r1375-r1377

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