anv: Track BOs that need a write-combined mapping

v2: simplify logic a bit (Lionel)

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/18841>

src/intel/vulkan/anv_allocator.c

@@ -1503,6 +1503,7 @@ anv_device_alloc_bo(struct anv_device *device,
          (alloc_flags & ANV_BO_ALLOC_CLIENT_VISIBLE_ADDRESS) != 0,
       .has_implicit_ccs = ccs_size > 0 ||
                           (device->info->verx10 >= 125 && !(alloc_flags & ANV_BO_ALLOC_NO_LOCAL_MEM)),
+      .map_wc = alloc_flags & ANV_BO_ALLOC_WRITE_COMBINE,
    };
 
    if (alloc_flags & ANV_BO_ALLOC_MAPPED) {
@@ -1572,6 +1573,9 @@ anv_device_map_bo(struct anv_device *device,
    assert(!bo->from_host_ptr);
    assert(size > 0);
 
+   if (bo->map_wc)
+      gem_flags |= I915_MMAP_WC;
+
    void *map = anv_gem_mmap(device, bo->gem_handle, offset, size, gem_flags);
    if (unlikely(map == MAP_FAILED))
       return vk_errorf(device, VK_ERROR_MEMORY_MAP_FAILED, "mmap failed: %m");