[Mesa-dev] [PATCH v2 25/32] intel/isl: Add a max_miptail_levels field to isl_tile_info

[Jason Ekstrand]

---
 src/intel/isl/isl.c | 5 +++++
 src/intel/isl/isl.h | 7 +++++++
 2 files changed, 12 insertions(+)

diff --git a/src/intel/isl/isl.c b/src/intel/isl/isl.c
index 4a8380ad540..3657b11ee00 100644
--- a/src/intel/isl/isl.c
+++ b/src/intel/isl/isl.c
@@ -181,6 +181,7 @@ isl_tiling_get_info(enum isl_tiling tiling,
       return;
    }
 
+   uint32_t max_miptail_levels = 0;
    switch (tiling) {
    case ISL_TILING_LINEAR:
       assert(bs > 0);
@@ -239,6 +240,7 @@ isl_tiling_get_info(enum isl_tiling tiling,
             .d = 1,
             .a = 1,
          };
+         max_miptail_levels = is_Ys ? 16 : 12;
          break;
 
       case ISL_SURF_DIM_2D:
@@ -262,6 +264,7 @@ isl_tiling_get_info(enum isl_tiling tiling,
             logical_el.h >>= (ffs(samples) - 1) / 2;
             logical_el.a = samples;
          }
+         max_miptail_levels = is_Ys ? 16 - ffs(samples) : 11;
          break;
 
       case ISL_SURF_DIM_3D:
@@ -279,6 +282,7 @@ isl_tiling_get_info(enum isl_tiling tiling,
             .d = 1 << (4 - ((ffs(format_bpb) - 3) / 3) + (1 * is_Ys)),
             .a = 1,
          };
+         max_miptail_levels = is_Ys ? 16 : 12;
          break;
       }
 
@@ -331,6 +335,7 @@ isl_tiling_get_info(enum isl_tiling tiling,
       .format_bpb = format_bpb,
       .logical_extent_el = logical_el,
       .phys_extent_B = phys_B,
+      .max_miptail_levels = max_miptail_levels,
    };
 }
 
diff --git a/src/intel/isl/isl.h b/src/intel/isl/isl.h
index 4fb212e33d5..0bcb7edc899 100644
--- a/src/intel/isl/isl.h
+++ b/src/intel/isl/isl.h
@@ -1085,6 +1085,13 @@ struct isl_tile_info {
     */
    struct isl_extent4d logical_extent_el;
 
+   /** The maximum number of miplevels that will fit in the miptail.
+    *
+    * This does not guarantee that the given number of miplevels will fit in
+    * the miptail as that is also dependent on the size of the miplevels.
+    */
+   uint32_t max_miptail_levels;
+
    /** The physical size of the tile in bytes and rows of bytes
     *
     * This field determines how the tiles of a surface are physically layed
-- 
2.19.1

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