intel: Add and use max_constant_urb_size_kb

This knowledge was repeated in multiple places so move the values to
intel_device_info struct.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Acked-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13014>

src/intel/dev/intel_device_info.c

@@ -219,6 +219,7 @@ static const struct intel_device_info intel_device_info_snb_gt2 = {
    .has_64bit_float = true,                         \
    .has_surface_tile_offset = true,                 \
    .timestamp_frequency = 12500000,                 \
+   .max_constant_urb_size_kb = 16,                  \
    .cs_prefetch_size = 512
 
 static const struct intel_device_info intel_device_info_ivb_gt1 = {
@@ -394,6 +395,7 @@ static const struct intel_device_info intel_device_info_hsw_gt3 = {
          [MESA_SHADER_GEOMETRY]  = 640,
       },
    },
+   .max_constant_urb_size_kb = 32,
    .simulator_id = 9,
 };
 
@@ -419,6 +421,7 @@ static const struct intel_device_info intel_device_info_hsw_gt3 = {
    .max_gs_threads = 504,                           \
    .max_wm_threads = 384,                           \
    .timestamp_frequency = 12500000,                 \
+   .max_constant_urb_size_kb = 32,                  \
    .cs_prefetch_size = 512
 
 static const struct intel_device_info intel_device_info_bdw_gt1 = {

src/intel/dev/intel_device_info.h

@@ -265,6 +265,12 @@ struct intel_device_info
       unsigned max_entries[4];
    } urb;
 
+   /* Maximum size in Kb that can be allocated to constants in the URB, this
+    * is usually divided among the stages for implementing push constants.
+    * See 3DSTATE_PUSH_CONSTANT_ALLOC_*.
+    */
+   unsigned max_constant_urb_size_kb;
+
    /**
     * Size of the command streamer prefetch. This is important to know for
     * self modifying batches.

src/intel/dev/intel_device_info_test.c

@@ -28,6 +28,8 @@ main(int argc, char *argv[])
       assert(devinfo.num_thread_per_eu != 0);
       assert(devinfo.timestamp_frequency != 0);
       assert(devinfo.cs_prefetch_size > 0);
+
+      assert(devinfo.ver < 7 || devinfo.max_constant_urb_size_kb > 0);
    }
 
    return 0;