intel/dev: Add a has_illegal_ccs_values flag

Whether or not CCS can be used without initialization depends on the
platform:

- On gfx7-8, each CCS element is 1-bit and encodes "fast-cleared" or
  "pass-through". So, those platforms have no illegal values.

- On gfx9-11, each CCS element is 2-bits and some bit combinations
  are invalid.

- On gfx12+, each CCS element is 4-bits but they have no truly illegal
  values. Unused encodings are interpreted as "pass-through".

Refer to the "MCS/CCS Buffers for Render Target(s)" sections of the
PRMs for more info.

Reviewed-by: Ivan Briano <ivan.briano@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20118>

src/intel/dev/intel_device_info.c

@@ -563,6 +563,7 @@ static const struct intel_device_info intel_device_info_chv = {
    .gt = 1,                                        \
    .has_llc = false,                               \
    .has_sample_with_hiz = true,                    \
+   .has_illegal_ccs_values = true,                 \
    .num_slices = 1,                                \
    .num_thread_per_eu = 6,                         \
    .max_vs_threads = 112,                          \
@@ -614,7 +615,8 @@ static const struct intel_device_info intel_device_info_chv = {
 #define GFX9_FEATURES                               \
    GFX8_FEATURES,                                   \
    GFX9_HW_INFO,                                    \
-   .has_sample_with_hiz = true
+   .has_sample_with_hiz = true,                     \
+   .has_illegal_ccs_values = true
 
 static const struct intel_device_info intel_device_info_skl_gt1 = {
    GFX9_FEATURES, .gt = 1,
@@ -837,6 +839,7 @@ static const struct intel_device_info intel_device_info_cfl_gt3 = {
    .has_64bit_int = false,                            \
    .has_integer_dword_mul = false,                    \
    .has_sample_with_hiz = false,                      \
+   .has_illegal_ccs_values = true,                    \
    .gt = _gt, .num_slices = _slices, .l3_banks = _l3, \
    .num_subslices = _subslices,                       \
    .max_eus_per_subslice = 8
@@ -890,6 +893,7 @@ static const struct intel_device_info intel_device_info_icl_gt0_5 = {
       GFX11_URB_MIN_MAX_ENTRIES,                    \
    },                                               \
    .disable_ccs_repack = true,                      \
+   .has_illegal_ccs_values = true,                  \
    .simulator_id = 28
 
 static const struct intel_device_info intel_device_info_ehl_4x8 = {

src/intel/dev/intel_device_info.h

@@ -134,6 +134,11 @@ struct intel_device_info
    bool supports_simd16_3src;
    bool disable_ccs_repack;
 
+   /**
+    * True if CCS needs to be initialized before use.
+    */
+   bool has_illegal_ccs_values;
+
    /**
     * True if CCS uses a flat virtual address translation to a memory
     * carve-out, rather than aux map translations, or additional surfaces.