tu: add debug option to force gmem

With autotuner we now want to be able to force gmem rendering,
it will respect existing constraints though.

Signed-off-by: Danylo Piliaiev <dpiliaiev@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12128>

src/freedreno/vulkan/tu_cmd_buffer.c

@@ -616,6 +616,9 @@ use_sysmem_rendering(struct tu_cmd_buffer *cmd,
    if (cmd->state.disable_gmem)
       return true;
 
+   if (unlikely(cmd->device->physical_device->instance->debug_flags & TU_DEBUG_GMEM))
+      return false;
+
    bool use_sysmem = tu_autotune_use_bypass(&cmd->device->autotune,
                                             cmd, autotune_result);
    if (*autotune_result) {

src/freedreno/vulkan/tu_device.c

@@ -317,6 +317,7 @@ static const struct debug_control tu_debug_options[] = {
    { "nir", TU_DEBUG_NIR },
    { "nobin", TU_DEBUG_NOBIN },
    { "sysmem", TU_DEBUG_SYSMEM },
+   { "gmem", TU_DEBUG_GMEM },
    { "forcebin", TU_DEBUG_FORCEBIN },
    { "noubwc", TU_DEBUG_NOUBWC },
    { "nomultipos", TU_DEBUG_NOMULTIPOS },

src/freedreno/vulkan/tu_private.h

@@ -252,6 +252,7 @@ enum tu_debug_flags
    TU_DEBUG_FLUSHALL = 1 << 10,
    TU_DEBUG_SYNCDRAW = 1 << 11,
    TU_DEBUG_DONT_CARE_AS_LOAD = 1 << 12,
+   TU_DEBUG_GMEM = 1 << 13,
 };
 
 struct tu_instance