From db401573f1a8a2a926901f752b4401e8916d976c Mon Sep 17 00:00:00 2001
From: Arthur Hanson Rasmusson <arthur@vgpu.io>
Date: Fri, 6 Nov 2026 22:09:22 -0500
Subject: vgsp-gl: GS SPH placement/maps/context A/B knobs

---
 kernel/gsp_phys_booter.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 55 insertions(+), 2 deletions(-)

(limited to 'kernel/gsp_phys_booter.c')

diff --git a/kernel/gsp_phys_booter.c b/kernel/gsp_phys_booter.c
index 0fc2ee7..96fdc46 100644
--- a/kernel/gsp_phys_booter.c
+++ b/kernel/gsp_phys_booter.c
@@ -18713,6 +18713,42 @@ bool gsp_phys_rmcall_gr_raster_pre_value(void)
 {
 	return READ_ONCE(gsp_phys_rmcall_gr_raster_pre);
 }
+
+/*
+ * SESSION 155 CONT 15: where the synthesized GS SPH lives inside the
+ * program-family page. 0 = family+0x780 (below the window's own VTG bind
+ * at family+0x900), 1 = family+0xe80 (above it; the DS's PROGRAM_REGION
+ * snapshot reads the bind VA, so a region starting there does not cover
+ * 0x780). Default 0 = legacy.
+ */
+static u32 gsp_phys_rmcall_gr_sph_gs_addr;
+module_param_named(sema_gl_sph_gs_addr, gsp_phys_rmcall_gr_sph_gs_addr,
+		   uint, 0644);
+MODULE_PARM_DESC(sema_gl_sph_gs_addr,
+	"Synth GS SPH offset in the family page: 0=+0x780 (legacy), 1=+0xe80 (above the VTG bind)");
+
+u32 gsp_phys_rmcall_gr_sph_gs_addr_value(void)
+{
+	return READ_ONCE(gsp_phys_rmcall_gr_sph_gs_addr);
+}
+
+/*
+ * SESSION 155 CONT 15: GS context A/B words emitted with the synth GS bind.
+ * bit0: SET_MESH_CONTROL (0x114c) <- 0
+ * bit1: SET_GS_MODE     (0x0208) <- 0 (TYPE_ANY)
+ * The client's per-frame push carries neither; if the init push left them
+ * set, the GS macro/mesh path may treat the stage specially. Default 0.
+ */
+static u32 gsp_phys_rmcall_gr_sph_gs_ctx;
+module_param_named(sema_gl_sph_gs_ctx, gsp_phys_rmcall_gr_sph_gs_ctx,
+		   uint, 0644);
+MODULE_PARM_DESC(sema_gl_sph_gs_ctx,
+	"Extra GS context with the synth bind: bit0=SET_MESH_CONTROL(0x114c)<-0, bit1=SET_GS_MODE(0x0208)<-0 (default 0)");
+
+u32 gsp_phys_rmcall_gr_sph_gs_ctx_value(void)
+{
+	return READ_ONCE(gsp_phys_rmcall_gr_sph_gs_ctx);
+}
 static bool gsp_phys_gr_mme_pairs_emitted;	/* launch emitted a pair run */
 static u32 gsp_phys_gr_mme_pairs_gen;		/* gen whose pairs retired OK */
 static u32 gsp_phys_gr_mme_launch_gen;		/* last built launch's gen */
@@ -29776,6 +29812,8 @@ gr_page_unmapped:
 				READ_ONCE(gsp_phys_rmcall_gr_sph_gs_mode);
 			bool emit_raster =
 				READ_ONCE(gsp_phys_rmcall_gr_raster_pre);
+			u32 gs_addr = READ_ONCE(gsp_phys_rmcall_gr_sph_gs_addr);
+			u32 gs_ctx = READ_ONCE(gsp_phys_rmcall_gr_sph_gs_ctx);
 
 			/*
 			 * SESSION 155 CONT 9: the prelude is prepended ahead of
@@ -30004,7 +30042,9 @@ gr_page_unmapped:
 			    (emit_j2 ? (bind_binding ? 8u : 7u) : 0u) +
 			    (emit_j4 ? (bind_binding ? 8u : 7u) : 0u) +
 			    (emit_j5 ? (bind_binding ? 8u : 7u) : 0u) +
-			    (emit_gsimg ? (9u + ((gs_mode & 1u) ? 11u : 0u)) : 0u) +
+			    (emit_gsimg ? (9u + ((gs_mode & 1u) ? 11u : 0u) +
+					   ((gs_ctx & 1u) ? 2u : 0u) +
+					   ((gs_ctx & 2u) ? 2u : 0u)) : 0u) +
 			    (emit_raster ? 17u : 0u)
 			    <= 96u) {
 				/*
@@ -30211,7 +30251,8 @@ gr_page_unmapped:
 				 * run here (nrun++ below).
 				 */
 				if (emit_gsimg) {
-					u64 gva = fam + 0x780u;
+					u64 gva = fam + (gs_addr ? 0xe80u :
+							 0x780u);
 
 					in[nfin++] = 0x20000000u | (1u << 16) |
 						     (0x2100u >> 2);
@@ -30246,6 +30287,18 @@ gr_page_unmapped:
 						in[nfin++] = 0u;
 						in[nfin++] = 0u;
 					}
+					if (gs_ctx & 1u) {
+						in[nfin++] = 0x20000000u |
+							     (1u << 16) |
+							     (0x114cu >> 2);
+						in[nfin++] = 0u;
+					}
+					if (gs_ctx & 2u) {
+						in[nfin++] = 0x20000000u |
+							     (1u << 16) |
+							     (0x0208u >> 2);
+						in[nfin++] = 0u;
+					}
 					in[nfin++] = 0x20000000u | (1u << 16) |
 						     (0x2100u >> 2);
 					in[nfin++] = (gs_mode & 2u) ? 0x41u :
-- 
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