freedreno: add "nogrow" debug param

Sometimes it is useful to disable the "growable" cmdstream buffers for
debugging.  (See 419a154d in libdrm)

Signed-off-by: Rob Clark <[email protected]>

3 files changed, 4 insertions, 1 deletions

diff --git a/src/gallium/drivers/freedreno/freedreno_batch.c b/src/gallium/drivers/freedreno/freedreno_batch.c
index 646c76fb57d..f5a5c6a3cc9 100644
--- a/src/gallium/drivers/freedreno/freedreno_batch.c
+++ b/src/gallium/drivers/freedreno/freedreno_batch.c
@@ -48,7 +48,8 @@ batch_init(struct fd_batch *batch)
 	 * we don't need to grow the ringbuffer.  Performance is likely to
 	 * suffer, but there is no good alternative.
 	 */
-	if (fd_device_version(ctx->screen->dev) < FD_VERSION_UNLIMITED_CMDS) {
+	if ((fd_device_version(ctx->screen->dev) < FD_VERSION_UNLIMITED_CMDS) ||
+			(fd_mesa_debug & FD_DBG_NOGROW)){
 		size = 0x100000;
 	}
 
diff --git a/src/gallium/drivers/freedreno/freedreno_screen.c b/src/gallium/drivers/freedreno/freedreno_screen.c
index 2fafb52b190..2ff89eb0f37 100644
--- a/src/gallium/drivers/freedreno/freedreno_screen.c
+++ b/src/gallium/drivers/freedreno/freedreno_screen.c
@@ -78,6 +78,7 @@ static const struct debug_named_value debug_options[] = {
 		{"nir",       FD_DBG_NIR,    "Prefer NIR as native IR"},
 		{"reorder",   FD_DBG_REORDER,"Enable reordering for draws/blits"},
 		{"bstat",     FD_DBG_BSTAT,  "Print batch stats at context destroy"},
+		{"nogrow",    FD_DBG_NOGROW, "Disable \"growable\" cmdstream buffers, even if kernel supports it"},
 		DEBUG_NAMED_VALUE_END
 };
 
diff --git a/src/gallium/drivers/freedreno/freedreno_util.h b/src/gallium/drivers/freedreno/freedreno_util.h
index c699f7badff..08bc5d7ba4a 100644
--- a/src/gallium/drivers/freedreno/freedreno_util.h
+++ b/src/gallium/drivers/freedreno/freedreno_util.h
@@ -79,6 +79,7 @@ enum adreno_stencil_op fd_stencil_op(unsigned op);
 #define FD_DBG_NIR      0x4000
 #define FD_DBG_REORDER  0x8000
 #define FD_DBG_BSTAT   0x10000
+#define FD_DBG_NOGROW  0x20000
 
 extern int fd_mesa_debug;
 extern bool fd_binning_enabled;