anv: track the first 2MB of unused VA

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32895>

src/intel/vulkan/anv_private.h

@@ -1145,6 +1145,10 @@ struct anv_physical_device {
     } memory;
 
     struct {
+       /**
+        * Unused
+        */
+       struct anv_va_range                      first_2mb;
        /**
         * General state pool
         */

src/intel/vulkan/anv_va.c

@@ -97,7 +97,9 @@ anv_physical_device_init_va_ranges(struct anv_physical_device *device)
    uint64_t _1Gb = 1ull * 1024 * 1024 * 1024;
    uint64_t _4Gb = 4ull * 1024 * 1024 * 1024;
 
-   uint64_t address = 0x000000200000ULL; /* 2MiB */
+   uint64_t address = 0;
+
+   address = va_add(&device->va.first_2mb, address, 2 * _1Mb);
 
    address = va_add(&device->va.general_state_pool, address,
                     2 * _1Gb - address);