pan/va: Implement the cycle model

Will feed into shader-db reporting, and maybe other things eventually.

Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15223>

src/panfrost/bifrost/meson.build

@@ -49,6 +49,7 @@ libpanfrost_bifrost_files = files(
   'valhall/va_lower_isel.c',
   'valhall/va_optimize.c',
   'valhall/va_pack.c',
+  'valhall/va_perf.c',
   'valhall/va_validate.c',
 )
 

src/panfrost/bifrost/valhall/va_perf.c

@@ -0,0 +1,77 @@
+
+/*
+ * Copyright (C) 2021 Collabora Ltd.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "va_compiler.h"
+#include "valhall.h"
+#include "bi_builder.h"
+
+void
+va_count_instr_stats(bi_instr *I, struct va_stats *stats)
+{
+   /* Adjusted for 64-bit arithmetic */
+   unsigned words = bi_count_write_registers(I, 0);
+
+   switch (valhall_opcodes[I->op].unit) {
+   /* Arithmetic is 2x slower for 64-bit than 32-bit */
+   case VA_UNIT_FMA:
+      stats->fma += words;
+      return;
+
+   case VA_UNIT_CVT:
+      stats->cvt += words;
+      return;
+
+   case VA_UNIT_SFU:
+      stats->sfu += words;
+      return;
+
+   /* Varying is scaled by 16-bit components interpolated */
+   case VA_UNIT_V:
+      stats->v += (I->vecsize + 1) *
+         (bi_is_regfmt_16(I->register_format) ? 1 : 2);
+      return;
+
+   /* We just count load/store and texturing for now */
+   case VA_UNIT_LS:
+      stats->ls++;
+      return;
+
+   case VA_UNIT_T:
+      stats->t++;
+      return;
+
+   /* Fused varying+texture loads 2 FP32 components of varying for texture
+    * coordinates and then textures */
+   case VA_UNIT_VT:
+      stats->ls += (2 * 2);
+      stats->t++;
+      return;
+
+   /* Nothing to do here */
+   case VA_UNIT_NONE:
+      return;
+   }
+
+   unreachable("Invalid unit");
+}