panvk: expose VK_KHR_display

It seems the common WSI code does all that's really needed here for us
already. Enabling this lets me run vkmark on PanVK.

This is a bit silly, because what actually happens here is that we end
up passing -1 as the display_fd to wsi_device_init(). This in turn leads
us to returning zero usable displays, which renders the extension
somewhat useless. But it is better than not supporting the extension, and
not supporting applications who have a hard depdendency on it fail, like
is the case with vkmark.

Tested-by: Alexandre ARNOUD <aarnoud@me.com>
Acked-by: Daniel Stone <daniels@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33916>

docs/features.txt

@@ -537,7 +537,7 @@ Khronos extensions that are not part of any Vulkan version:
   VK_KHR_cooperative_matrix                             DONE (anv, radv/gfx11+)
   VK_KHR_depth_clamp_zero_one                           DONE (vn)
   VK_KHR_deferred_host_operations                       DONE (anv, hasvk, lvp, radv, vn)
-  VK_KHR_display                                        DONE (anv, nvk, pvr, radv, tu, v3dv, vn)
+  VK_KHR_display                                        DONE (anv, nvk, panvk, pvr, radv, tu, v3dv, vn)
   VK_KHR_display_swapchain                              not started
   VK_KHR_external_fence_fd                              DONE (anv, hasvk, nvk, panvk, pvr, radv, tu, v3dv, vn)
   VK_KHR_external_fence_win32                           not started

docs/relnotes/new_features.txt

@@ -18,3 +18,4 @@ VK_KHR_shader_quad_control on panvk/v10+
 VK_EXT_device_memory_report on RADV
 VK_KHR_shader_subgroup_extended_types on panvk/v10+
 shaderStorageImageExtendedFormats on panvk
+VK_KHR_display on panvk

src/panfrost/vulkan/panvk_instance.c

@@ -62,6 +62,9 @@ static const struct vk_instance_extension_table panvk_instance_extensions = {
 #ifdef PANVK_USE_WSI_PLATFORM
    .KHR_surface = true,
 #endif
+#ifdef VK_USE_PLATFORM_DISPLAY_KHR
+   .KHR_display = true,
+#endif
 #ifdef VK_USE_PLATFORM_WAYLAND_KHR
    .KHR_wayland_surface = true,
 #endif

src/panfrost/vulkan/panvk_instance.h

@@ -29,7 +29,8 @@ enum panvk_debug_flags {
 
 #if defined(VK_USE_PLATFORM_WAYLAND_KHR) || \
     defined(VK_USE_PLATFORM_XCB_KHR) || \
-    defined(VK_USE_PLATFORM_XLIB_KHR)
+    defined(VK_USE_PLATFORM_XLIB_KHR) || \
+    defined(VK_USE_PLATFORM_DISPLAY_KHR)
 #define PANVK_USE_WSI_PLATFORM
 #endif