turnip: Allocate tess BOs as a function of draw size

To store tess outputs, the HS stg's into two buffers, one for
per-vertex/per-patch output variables (tess_param) and one for
TessLevelInner/Outer (tess_factor). The addresses of these buffers
are uploaded as consts to the HS/DS and the tess_factor iova is
written to REG_A6XX_PC_TESSFACTOR_ADDR. While the sizes of these
buffers are a function of vetex count and patch count, allocation is
relatively straightforward on freedreno- just keep track of the max
required buffer size for the entire batch and allocate before batch
submit.

In Vulkan, however, a given pipeline can be bound multiple times
across any number of command buffers, each drawing with a different
number of vertices. One solution is to track the max buffer size for
the entire command buffer (similar to fd_batch) and on
vkEndCommandBuffer, allocate appropriately sized tess BOs. Since the
tess BOs addresses are emitted as part of the pipeline state setup
(e.g. PKT4 to REG_A6XX_PC_TESSFACTOR_ADDR), we need to create a new
state group independent of a specific pipeline and parameterize its
IB with the command buffer specific tess BO iovas.

Without a larger refactor, the simplest way to do this is just to
emit per-draw call consts and leverage scratch_bo to re-use buffers.
This way we won't have to store and rewrite earlier packets in the
command stream on vkEndCommandBuffer.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5059>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/freedreno/vulkan/tu_private.h b/src/freedreno/vulkan/tu_private.h
index 39f303ee7d7..153184f5999 100644
--- a/src/freedreno/vulkan/tu_private.h
+++ b/src/freedreno/vulkan/tu_private.h
@@ -427,6 +427,7 @@ enum tu_draw_state_group_id
 {
    TU_DRAW_STATE_PROGRAM,
    TU_DRAW_STATE_PROGRAM_BINNING,
+   TU_DRAW_STATE_TESS,
    TU_DRAW_STATE_VB,
    TU_DRAW_STATE_VI,
    TU_DRAW_STATE_VI_BINNING,
@@ -1102,6 +1103,15 @@ struct tu_pipeline
 
    struct
    {
+      uint32_t patch_type;
+      uint32_t per_vertex_output_size;
+      uint32_t per_patch_output_size;
+      uint32_t hs_bo_regid;
+      uint32_t ds_bo_regid;
+   } tess;
+
+   struct
+   {
       struct tu_cs_entry state_ib;
    } rast;