drm/nouveau/gr/gf117-: assume no PPC if NV_PGRAPH_GPC_GPM_PD_PES_TPC_ID_MASK is zero

fdo#92761

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

3 files changed, 5 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/gr/ctxgf117.c b/drivers/gpu/drm/nouveau/nvkm/engine/gr/ctxgf117.c
index b5b875928aba..74de7a96c22a 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/gr/ctxgf117.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/gr/ctxgf117.c
@@ -207,6 +207,8 @@ gf117_grctx_generate_attrib(struct gf100_grctx *info)
                         const u32 b =  beta * gr->ppc_tpc_nr[gpc][ppc];
                         const u32 t = timeslice_mode;
                         const u32 o = PPC_UNIT(gpc, ppc, 0);
+                        if (!(gr->ppc_mask[gpc] & (1 << ppc)))
+                                continue;
                         mmio_skip(info, o + 0xc0, (t << 28) | (b << 16) | ++bo);
                         mmio_wr32(info, o + 0xc0, (t << 28) | (b << 16) | --bo);
                         bo += grctx->attrib_nr_max * gr->ppc_tpc_nr[gpc][ppc];
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c b/drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c
index dda7a7d224c9..7cdea770fc4c 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.c
@@ -1530,6 +1530,8 @@ gf100_gr_oneinit(struct nvkm_gr *base)
                 gr->ppc_nr[i]  = gr->func->ppc_nr;
                 for (j = 0; j < gr->ppc_nr[i]; j++) {
                         u8 mask = nvkm_rd32(device, GPC_UNIT(i, 0x0c30 + (j * 4)));
+                        if (mask)
+                                gr->ppc_mask[i] |= (1 << j);
                         gr->ppc_tpc_nr[i][j] = hweight8(mask);
                 }
         }
diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.h b/drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.h
index 4611961b1187..02e78b8d93f6 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.h
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/gr/gf100.h
@@ -97,6 +97,7 @@ struct gf100_gr {
         u8 tpc_nr[GPC_MAX];
         u8 tpc_total;
         u8 ppc_nr[GPC_MAX];
+        u8 ppc_mask[GPC_MAX];
         u8 ppc_tpc_nr[GPC_MAX][4];
 
         struct nvkm_memory *unk4188b4;