gallium: add PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT

This avoids a serious r600g bug leading to a GPU hang.
The chances this bug will get fixed are pretty low now.

I deeply regret listening to others and not pushing this patch, leaving
other users with a GPU-crashing driver. Yes, it should be fixed
in the compiler and it's ugly, but users couldn't care less about that.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=86720

Cc: 11.0 10.6 <[email protected]>
Reviewed-by: Brian Paul <[email protected]>

1 files changed, 4 insertions, 0 deletions

diff --git a/src/gallium/drivers/svga/svga_screen.c b/src/gallium/drivers/svga/svga_screen.c
index 9bf661fab8c..17b042e7d95 100644
--- a/src/gallium/drivers/svga/svga_screen.c
+++ b/src/gallium/drivers/svga/svga_screen.c
@@ -456,6 +456,8 @@ vgpu9_get_shader_param(struct pipe_screen *screen, unsigned shader,
       case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
       case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
          return 0;
+      case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+         return 32;
       }
       /* If we get here, we failed to handle a cap above */
       debug_printf("Unexpected fragment shader query %u\n", param);
@@ -512,6 +514,8 @@ vgpu9_get_shader_param(struct pipe_screen *screen, unsigned shader,
       case PIPE_SHADER_CAP_TGSI_FMA_SUPPORTED:
       case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
          return 0;
+      case PIPE_SHADER_CAP_MAX_UNROLL_ITERATIONS_HINT:
+         return 32;
       }
       /* If we get here, we failed to handle a cap above */
       debug_printf("Unexpected vertex shader query %u\n", param);