Mesa (main): intel/isl: Add support for scratch buffers

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Module: Mesa
Branch: main
Commit: 96ee78778b515d5b71038c6ac16ad6f627c5062e
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=96ee78778b515d5b71038c6ac16ad6f627c5062e

Author: Jason Ekstrand <jason at jlekstrand.net>
Date:   Tue Oct 20 13:23:31 2020 -0500

intel/isl: Add support for scratch buffers

XeHP adds support for a new surface type for scratch.  It's similar to
SURFTYPE_STRBUF in that it's a 2D array-of-struct format but the one
key difference is that the U coordinate is computed automatically based
on the thread ID and only the V coordinate is provided in the dataport
message.

Reviewed-by: Jordan Justen <jordan.l.justen at intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11582>

---

 src/intel/isl/isl.h               |  2 ++
 src/intel/isl/isl_surface_state.c | 28 +++++++++++++++++++++++-----
 2 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/src/intel/isl/isl.h b/src/intel/isl/isl.h
index d393846700d..88e3d656aec 100644
--- a/src/intel/isl/isl.h
+++ b/src/intel/isl/isl.h
@@ -1689,6 +1689,8 @@ struct isl_buffer_fill_state_info {
    struct isl_swizzle swizzle;
 
    uint32_t stride_B;
+
+   bool is_scratch;
 };
 
 struct isl_depth_stencil_hiz_emit_info {
diff --git a/src/intel/isl/isl_surface_state.c b/src/intel/isl/isl_surface_state.c
index e9d8c002842..72e9d03402a 100644
--- a/src/intel/isl/isl_surface_state.c
+++ b/src/intel/isl/isl_surface_state.c
@@ -826,8 +826,9 @@ isl_genX(buffer_fill_state_s)(const struct isl_device *dev, void *state,
     *
     *  buffer_size = (surface_size & ~3) - (surface_size & 3)
     */
-   if (info->format == ISL_FORMAT_RAW  ||
-       info->stride_B < isl_format_get_layout(info->format)->bpb / 8) {
+   if ((info->format == ISL_FORMAT_RAW  ||
+        info->stride_B < isl_format_get_layout(info->format)->bpb / 8) &&
+       !info->is_scratch) {
       assert(info->stride_B == 1);
       uint64_t aligned_size = isl_align(buffer_size, 4);
       buffer_size = aligned_size + (aligned_size - buffer_size);
@@ -855,9 +856,28 @@ isl_genX(buffer_fill_state_s)(const struct isl_device *dev, void *state,
 
    struct GENX(RENDER_SURFACE_STATE) s = { 0, };
 
-   s.SurfaceType = SURFTYPE_BUFFER;
    s.SurfaceFormat = info->format;
 
+   s.SurfaceType = SURFTYPE_BUFFER;
+#if GFX_VERx10 >= 125
+   if (info->is_scratch) {
+      /* From the BSpec:
+       *
+       *    "For surfaces of type SURFTYPE_SCRATCH, valid range of pitch is:
+       *    [63,262143] -> [64B, 256KB].  Also, for SURFTYPE_SCRATCH, the
+       *    pitch must be a multiple of 64bytes."
+       */
+      assert(info->format == ISL_FORMAT_RAW);
+      assert(info->stride_B % 64 == 0);
+      assert(info->stride_B <= 256 * 1024);
+      s.SurfaceType = SURFTYPE_SCRATCH;
+   }
+#else
+   assert(!info->is_scratch);
+#endif
+
+   s.SurfacePitch = info->stride_B - 1;
+
 #if GFX_VER >= 6
    s.SurfaceVerticalAlignment = isl_encode_valign[4];
 #if GFX_VER >= 7
@@ -895,8 +915,6 @@ isl_genX(buffer_fill_state_s)(const struct isl_device *dev, void *state,
       }
    }
 
-   s.SurfacePitch = info->stride_B - 1;
-
 #if GFX_VER >= 6
    s.NumberofMultisamples = MULTISAMPLECOUNT_1;
 #endif