winsys/amdgpu: Enlarge const IB size.

Necessary to prevent performance regressions due to extra flushing.

Probably should enlarge it even further when also updating
uniforms through the CE, but this seems large enough for now.

v2: Add preamble IB.

Signed-off-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/gallium/winsys/amdgpu/drm/amdgpu_cs.c

@@ -199,14 +199,26 @@ amdgpu_ctx_query_reset_status(struct radeon_winsys_ctx *rwctx)
 /* COMMAND SUBMISSION */
 
 static bool amdgpu_get_new_ib(struct radeon_winsys *ws, struct amdgpu_ib *ib,
-                              struct amdgpu_cs_ib_info *info)
+                              struct amdgpu_cs_ib_info *info, unsigned ib_type)
 {
    /* Small IBs are better than big IBs, because the GPU goes idle quicker
     * and there is less waiting for buffers and fences. Proof:
     *   http://www.phoronix.com/scan.php?page=article&item=mesa-111-si&num=1
     */
-   const unsigned buffer_size = 128 * 1024 * 4;
-   const unsigned ib_size = 20 * 1024 * 4;
+   unsigned buffer_size, ib_size;
+
+   switch (ib_type) {
+   case IB_CONST_PREAMBLE:
+      buffer_size = 4 * 1024 * 4;
+      ib_size = 1024 * 4;
+   case IB_CONST:
+      buffer_size = 512 * 1024 * 4;
+      ib_size = 128 * 1024 * 4;
+      break;
+   case IB_MAIN:
+      buffer_size = 128 * 1024 * 4;
+      ib_size = 20 * 1024 * 4;
+   }
 
    ib->base.cdw = 0;
    ib->base.buf = NULL;
@@ -350,7 +362,7 @@ amdgpu_cs_create(struct radeon_winsys_ctx *rwctx,
       return NULL;
    }
 
-   if (!amdgpu_get_new_ib(&ctx->ws->base, &cs->main, &cs->ib[IB_MAIN])) {
+   if (!amdgpu_get_new_ib(&ctx->ws->base, &cs->main, &cs->ib[IB_MAIN], IB_MAIN)) {
       amdgpu_destroy_cs_context(cs);
       FREE(cs);
       return NULL;
@@ -373,7 +385,7 @@ amdgpu_cs_add_const_ib(struct radeon_winsys_cs *rcs)
    if (cs->ring_type != RING_GFX || cs->const_ib.ib_mapped)
       return NULL;
 
-   if (!amdgpu_get_new_ib(&ws->base, &cs->const_ib, &cs->ib[IB_CONST]))
+   if (!amdgpu_get_new_ib(&ws->base, &cs->const_ib, &cs->ib[IB_CONST], IB_CONST))
       return NULL;
 
    cs->request.number_of_ibs = 2;
@@ -760,12 +772,12 @@ static void amdgpu_cs_flush(struct radeon_winsys_cs *rcs,
 cleanup:
    amdgpu_cs_context_cleanup(cs);
 
-   amdgpu_get_new_ib(&ws->base, &cs->main, &cs->ib[IB_MAIN]);
+   amdgpu_get_new_ib(&ws->base, &cs->main, &cs->ib[IB_MAIN], IB_MAIN);
    if (cs->const_ib.ib_mapped)
-      amdgpu_get_new_ib(&ws->base, &cs->const_ib, &cs->ib[IB_CONST]);
+      amdgpu_get_new_ib(&ws->base, &cs->const_ib, &cs->ib[IB_CONST], IB_CONST);
    if (cs->const_preamble_ib.ib_mapped)
       amdgpu_get_new_ib(&ws->base, &cs->const_preamble_ib,
-                                 &cs->ib[IB_CONST_PREAMBLE]);
+                                 &cs->ib[IB_CONST_PREAMBLE], IB_CONST_PREAMBLE);
 
    ws->num_cs_flushes++;
 }