radeonsi: fix a hang with streamout on Hawaii

I actually couldn't reproduce this one, but internal docs recommend this
workaround. Better safe than sorry.

Also, the number of dwords for the sync packets is increased by 4 instead
of 2, because it wasn't bumped last time when a new packet was added there.

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/src/gallium/drivers/radeon/r600_pipe_common.h b/src/gallium/drivers/radeon/r600_pipe_common.h
index 5348b8d..dcec2bb 100644 (file)
--- a/src/gallium/drivers/radeon/r600_pipe_common.h
+++ b/src/gallium/drivers/radeon/r600_pipe_common.h
@@ -72,6 +72,7 @@
 #define R600_CONTEXT_WAIT_3D_IDLE              (1 << 17)
 #define R600_CONTEXT_WAIT_CP_DMA_IDLE          (1 << 18)
 #define R600_CONTEXT_VGT_FLUSH                 (1 << 19)
+#define R600_CONTEXT_VGT_STREAMOUT_SYNC                (1 << 20)
 
 /* Debug flags. */
 /* logging */

diff --git a/src/gallium/drivers/radeonsi/si_state_draw.c b/src/gallium/drivers/radeonsi/si_state_draw.c
index 1816540..eb21ba1 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_state_draw.c
+++ b/src/gallium/drivers/radeonsi/si_state_draw.c
@@ -868,11 +868,15 @@ void si_emit_cache_flush(struct r600_common_context *sctx, struct r600_atom *ato
                radeon_emit(cs, PKT3(PKT3_EVENT_WRITE, 0, 0));
                radeon_emit(cs, EVENT_TYPE(V_028A90_VGT_FLUSH) | EVENT_INDEX(0));
        }
+       if (sctx->flags & R600_CONTEXT_VGT_STREAMOUT_SYNC) {
+               radeon_emit(cs, PKT3(PKT3_EVENT_WRITE, 0, 0));
+               radeon_emit(cs, EVENT_TYPE(V_028A90_VGT_STREAMOUT_SYNC) | EVENT_INDEX(0));
+       }
 
        sctx->flags = 0;
 }
 
-const struct r600_atom si_atom_cache_flush = { si_emit_cache_flush, 13 }; /* number of CS dwords */
+const struct r600_atom si_atom_cache_flush = { si_emit_cache_flush, 17 }; /* number of CS dwords */
 
 static void si_get_draw_start_count(struct si_context *sctx,
                                    const struct pipe_draw_info *info,
@@ -985,6 +989,14 @@ void si_draw_vbo(struct pipe_context *ctx, const struct pipe_draw_info *info)
        }
 #endif
 
+       /* Workaround for a VGT hang when streamout is enabled.
+        * It must be done after drawing. */
+       if (sctx->b.family == CHIP_HAWAII &&
+           (sctx->b.streamout.streamout_enabled ||
+            sctx->b.streamout.prims_gen_query_enabled)) {
+               sctx->b.flags |= R600_CONTEXT_VGT_STREAMOUT_SYNC;
+       }
+
        /* Set the depth buffer as dirty. */
        if (sctx->framebuffer.state.zsbuf) {
                struct pipe_surface *surf = sctx->framebuffer.state.zsbuf;