vulkan: Add KHR_display extension using DRM [v10]

This adds support for the KHR_display extension support to the vulkan
WSI layer. Driver support will be added separately.

v2:
	* fix double ;; in wsi_common_display.c

	* Move mode list from wsi_display to wsi_display_connector

	* Fix scope for wsi_display_mode andwsi_display_connector
          allocs

	* Switch all allocations to vk_zalloc instead of vk_alloc.

	* Fix DRM failure in
          wsi_display_get_physical_device_display_properties

	  When DRM fails, or when we don't have a master fd
	  (presumably due to application errors), just return 0
	  properties from this function, which is at least a valid
	  response.

	* Use vk_outarray for all property queries

	  This is a bit less error-prone than open-coding the same
	  stuff.

	* Remove VK_COMPOSITE_ALPHA_INHERIT_BIT_KHR from surface caps

	  Until we have multi-plane support, we shouldn't pretend to
	  have any multi-plane semantics, even if undefined.

	Suggested-by: Jason Ekstrand <[email protected]>

	* Simplify addition of VK_USE_PLATFORM_DISPLAY_KHR to
          vulkan_wsi_args

	Suggested-by: Eric Engestrom <[email protected]>

v3:
	Add separate 'display_fd' and 'render_fd' arguments to
	wsi_device_init API. This allows drivers to use different FDs
	for the different aspects of the device.

	Use largest mode as display size when no preferred mode.

	If the display doesn't provide a preferred mode, we'll assume
	that the largest supported mode is the "physical size" of the
	device and report that.

v4:
	Make wsi_image_state enumeration values uppercase.
	Follow more common mesa conventions.

	Remove 'render_fd' from wsi_device_init API.  The
	wsi_common_display code doesn't use this fd at all, so stop
	passing it in. This avoids any potential confusion over which
	fd to use when creating display-relative object handles.

	Remove call to wsi_create_prime_image which would never have
	been reached as the necessary condition (use_prime_blit) is
	never set.

	whitespace cleanups in wsi_common_display.c

	Suggested-by: Jason Ekstrand <[email protected]>

	Add depth/bpp info to available surface formats.  Instead of
	hard-coding depth 24 bpp 32 in the drmModeAddFB call, use the
	requested format to find suitable values.

	Destroy kernel buffers and FBs when swapchain is destroyed. We
	were leaking both of these kernel objects across swapchain
	destruction.

	Note that wsi_display_wait_for_event waits for anything to
	happen.  wsi_display_wait_for_event is simply a yield so that
	the caller can then check to see if the desired state change
	has occurred.

	Record swapchain failures in chain for later return. If some
	asynchronous swapchain activity fails, we need to tell the
	application eventually. Record the failure in the swapchain
	and report it at the next acquire_next_image or queue_present
	call.

	Fix error returns from wsi_display_setup_connector.  If a
	malloc failed, then the result should be
	VK_ERROR_OUT_OF_HOST_MEMORY. Otherwise, the associated ioctl
	failed and we're either VT switched away, or our lease has
	been revoked, in which case we should return
	VK_ERROR_OUT_OF_DATE_KHR.

	Make sure both sides of if/else brace use matches

	Note that we assume drmModeSetCrtc is synchronous. Add a
	comment explaining why we can idle any previous displayed
	image as soon as the mode set returns.

	Note that EACCES from drmModePageFlip means VT inactive.  When
	vt switched away drmModePageFlip returns EACCES. Poll once a
	second waiting until we get some other return value back.

	Clean up after alloc failure in
	wsi_display_surface_create_swapchain. Destroy any created
	images, free the swapchain.

	Remove physical_device from wsi_display_init_wsi. We never
	need this value, so remove it from the API and from the
	internal wsi_display structure.

	Use drmModeAddFB2 in wsi_display_image_init.  This takes a drm
	format instead of depth/bpp, which provides more control over
	the format of the data.

v5:
	Set the 'currentStackIndex' member of the
	VkDisplayPlanePropertiesKHR record to zero, instead of
	indexing across all displays. This value is the stack depth of
	the plane within an individual display, and as the current
	code supports only a single plane per display, should be set
	to zero for all elements

	Discovered-by: David Mao <[email protected]>

v6:
	Remove 'platform_display' bits from the build and use the
	existing 'platform_drm' instead.

v7:
	Ensure VK_ICD_WSI_PLATFORM_MAX is large enough by
	setting to VK_ICD_WSI_PLATFORM_DISPLAY + 1

v8:
	Simplify wsi_device_init failure from wsi_display_init_wsi
	by using the same pattern as the other wsi layers.

    Adopt Jason Ekstrand's white space and variable declaration
	suggestions. Declare variables at first use, eliminate extra
	whitespace between types and names, add list iterator helpers,
	switch to lower-case list_ macros.

    Respond to Jason's April 8 review:

	* Create a function to convert relative to absolute timeouts
          to catch overflow issues in one place

	* use VK_NULL_HANDLE to clear prop->currentDisplay

	* Get rid of available_present_modes array.

	* return OUT_OF_DATE_KHR when display_queue_next called after
	  display has been released.

	* Make errors from mode setting fatal in display_queue_next

	* Remove duplicate pthread_mutex_init call

	* Add wsi_init_pthread_cond_monotonic helper function to
	  isolate pthread error handling from wsi_display_init_wsi

	Suggested-by: Jason Ekstrand <[email protected]>

v9:
	Fix vscan handling by using MAX2(vscan, 1) everywhere. Vscan
	can be zero anywhere, which is treated the same as 1.

	Suggested-by: Jason Ekstrand <[email protected]>

v10:
	Respond to Vulkan CTS failures.

	1. Initialize planeReorderPossible in display_properties code

	2. Only report connected displays in
	   get_display_plane_supported_displays

	3. Return VK_ERROR_OUT_OF_HOST_MEMORY when pthread cond
	   initialization fails.

	Signed-off-by: Jason Ekstrand <[email protected]>

	4. Add vkCreateDisplayModeKHR. This doesn't actually create
	   new modes, it only looks to see if the requested parameters
	   matches an existing mode and returns that.

	Suggested-by: Jason Ekstrand <[email protected]>

Reviewed-by: Jason Ekstrand <[email protected]>
Signed-off-by: Keith Packard <[email protected]>

8 files changed, 1604 insertions, 3 deletions

diff --git a/src/vulkan/Makefile.am b/src/vulkan/Makefile.am
index 3da03ed09e1..352cfacab31 100644
--- a/src/vulkan/Makefile.am
+++ b/src/vulkan/Makefile.am
@@ -54,6 +54,13 @@ AM_CPPFLAGS += \
 VULKAN_WSI_SOURCES += $(VULKAN_WSI_X11_FILES)
 endif
 
+if HAVE_PLATFORM_DRM
+AM_CPPFLAGS += \
+	-DVK_USE_PLATFORM_DISPLAY_KHR
+
+VULKAN_WSI_SOURCES += $(VULKAN_WSI_DISPLAY_FILES)
+endif
+
 CLEANFILES = \
 	$(VULKAN_UTIL_GENERATED_FILES) \
 	$(VULKAN_WSI_WAYLAND_GENERATED_FILES)
diff --git a/src/vulkan/Makefile.sources b/src/vulkan/Makefile.sources
index 101a94349c6..f0f6bcd4fd8 100644
--- a/src/vulkan/Makefile.sources
+++ b/src/vulkan/Makefile.sources
@@ -19,6 +19,10 @@ VULKAN_WSI_X11_FILES := \
 	wsi/wsi_common_x11.c \
 	wsi/wsi_common_x11.h
 
+VULKAN_WSI_DISPLAY_FILES := \
+	wsi/wsi_common_display.c \
+	wsi/wsi_common_display.h
+
 VULKAN_UTIL_FILES := \
 	util/vk_alloc.h \
 	util/vk_debug_report.c \
diff --git a/src/vulkan/wsi/meson.build b/src/vulkan/wsi/meson.build
index 223c8ca357e..53306295ee3 100644
--- a/src/vulkan/wsi/meson.build
+++ b/src/vulkan/wsi/meson.build
@@ -59,6 +59,14 @@ if with_platform_wayland
   ]
 endif
 
+if with_platform_drm
+  vulkan_wsi_args += '-DVK_USE_PLATFORM_DISPLAY_KHR'
+  files_vulkan_wsi += files(
+    'wsi_common_display.c',
+    'wsi_common_display.h',
+  )
+endif
+
 libvulkan_wsi = static_library(
   'vulkan_wsi',
   files_vulkan_wsi,
diff --git a/src/vulkan/wsi/wsi_common.c b/src/vulkan/wsi/wsi_common.c
index 87e508ddf85..142c5d8fe58 100644
--- a/src/vulkan/wsi/wsi_common.c
+++ b/src/vulkan/wsi/wsi_common.c
@@ -32,7 +32,8 @@ VkResult
 wsi_device_init(struct wsi_device *wsi,
                 VkPhysicalDevice pdevice,
                 WSI_FN_GetPhysicalDeviceProcAddr proc_addr,
-                const VkAllocationCallbacks *alloc)
+                const VkAllocationCallbacks *alloc,
+                int display_fd)
 {
    VkResult result;
 
@@ -91,6 +92,12 @@ wsi_device_init(struct wsi_device *wsi,
       goto fail;
 #endif
 
+#ifdef VK_USE_PLATFORM_DISPLAY_KHR
+   result = wsi_display_init_wsi(wsi, alloc, display_fd);
+   if (result != VK_SUCCESS)
+      goto fail;
+#endif
+
    return VK_SUCCESS;
 
 fail:
@@ -102,6 +109,9 @@ void
 wsi_device_finish(struct wsi_device *wsi,
                   const VkAllocationCallbacks *alloc)
 {
+#ifdef VK_USE_PLATFORM_DISPLAY_KHR
+   wsi_display_finish_wsi(wsi, alloc);
+#endif
 #ifdef VK_USE_PLATFORM_WAYLAND_KHR
    wsi_wl_finish_wsi(wsi, alloc);
 #endif
diff --git a/src/vulkan/wsi/wsi_common.h b/src/vulkan/wsi/wsi_common.h
index 6cf729ba025..61b1de59d7f 100644
--- a/src/vulkan/wsi/wsi_common.h
+++ b/src/vulkan/wsi/wsi_common.h
@@ -68,7 +68,7 @@ struct wsi_format_modifier_properties_list {
 
 struct wsi_interface;
 
-#define VK_ICD_WSI_PLATFORM_MAX 5
+#define VK_ICD_WSI_PLATFORM_MAX (VK_ICD_WSI_PLATFORM_DISPLAY + 1)
 
 struct wsi_device {
    VkPhysicalDevice pdevice;
@@ -116,7 +116,8 @@ VkResult
 wsi_device_init(struct wsi_device *wsi,
                 VkPhysicalDevice pdevice,
                 WSI_FN_GetPhysicalDeviceProcAddr proc_addr,
-                const VkAllocationCallbacks *alloc);
+                const VkAllocationCallbacks *alloc,
+                int display_fd);
 
 void
 wsi_device_finish(struct wsi_device *wsi,
diff --git a/src/vulkan/wsi/wsi_common_display.c b/src/vulkan/wsi/wsi_common_display.c
new file mode 100644
index 00000000000..fd2a4ad9930
--- /dev/null
+++ b/src/vulkan/wsi/wsi_common_display.c
@@ -0,0 +1,1477 @@
+/*
+ * Copyright © 2017 Keith Packard
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#include "util/macros.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <stdbool.h>
+#include <math.h>
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+#include <drm_fourcc.h>
+#include "util/hash_table.h"
+#include "util/list.h"
+
+#include "vk_util.h"
+#include "wsi_common_private.h"
+#include "wsi_common_display.h"
+#include "wsi_common_queue.h"
+
+#if 0
+#define wsi_display_debug(...) fprintf(stderr, __VA_ARGS__)
+#define wsi_display_debug_code(...)     __VA_ARGS__
+#else
+#define wsi_display_debug(...)
+#define wsi_display_debug_code(...)
+#endif
+
+/* These have lifetime equal to the instance, so they effectively
+ * never go away. This means we must keep track of them separately
+ * from all other resources.
+ */
+typedef struct wsi_display_mode {
+   struct list_head             list;
+   struct wsi_display_connector *connector;
+   bool                         valid; /* was found in most recent poll */
+   bool                         preferred;
+   uint32_t                     clock; /* in kHz */
+   uint16_t                     hdisplay, hsync_start, hsync_end, htotal, hskew;
+   uint16_t                     vdisplay, vsync_start, vsync_end, vtotal, vscan;
+   uint32_t                     flags;
+} wsi_display_mode;
+
+typedef struct wsi_display_connector {
+   struct list_head             list;
+   struct wsi_display           *wsi;
+   uint32_t                     id;
+   uint32_t                     crtc_id;
+   char                         *name;
+   bool                         connected;
+   bool                         active;
+   struct list_head             display_modes;
+   wsi_display_mode             *current_mode;
+   drmModeModeInfo              current_drm_mode;
+} wsi_display_connector;
+
+struct wsi_display {
+   struct wsi_interface         base;
+
+   const VkAllocationCallbacks  *alloc;
+
+   int                          fd;
+
+   pthread_mutex_t              wait_mutex;
+   pthread_cond_t               wait_cond;
+   pthread_t                    wait_thread;
+
+   struct list_head             connectors;
+};
+
+#define wsi_for_each_display_mode(_mode, _conn)                 \
+   list_for_each_entry_safe(struct wsi_display_mode, _mode,     \
+                            &(_conn)->display_modes, list)
+
+#define wsi_for_each_connector(_conn, _dev)                             \
+   list_for_each_entry_safe(struct wsi_display_connector, _conn,        \
+                            &(_dev)->connectors, list)
+
+enum wsi_image_state {
+   WSI_IMAGE_IDLE,
+   WSI_IMAGE_DRAWING,
+   WSI_IMAGE_QUEUED,
+   WSI_IMAGE_FLIPPING,
+   WSI_IMAGE_DISPLAYING
+};
+
+struct wsi_display_image {
+   struct wsi_image             base;
+   struct wsi_display_swapchain *chain;
+   enum wsi_image_state         state;
+   uint32_t                     fb_id;
+   uint32_t                     buffer[4];
+   uint64_t                     flip_sequence;
+};
+
+struct wsi_display_swapchain {
+   struct wsi_swapchain         base;
+   struct wsi_display           *wsi;
+   VkIcdSurfaceDisplay          *surface;
+   uint64_t                     flip_sequence;
+   VkResult                     status;
+   struct wsi_display_image     images[0];
+};
+
+ICD_DEFINE_NONDISP_HANDLE_CASTS(wsi_display_mode, VkDisplayModeKHR)
+ICD_DEFINE_NONDISP_HANDLE_CASTS(wsi_display_connector, VkDisplayKHR)
+
+static bool
+wsi_display_mode_matches_drm(wsi_display_mode *wsi,
+                             drmModeModeInfoPtr drm)
+{
+   return wsi->clock == drm->clock &&
+      wsi->hdisplay == drm->hdisplay &&
+      wsi->hsync_start == drm->hsync_start &&
+      wsi->hsync_end == drm->hsync_end &&
+      wsi->htotal == drm->htotal &&
+      wsi->hskew == drm->hskew &&
+      wsi->vdisplay == drm->vdisplay &&
+      wsi->vsync_start == drm->vsync_start &&
+      wsi->vsync_end == drm->vsync_end &&
+      wsi->vtotal == drm->vtotal &&
+      MAX2(wsi->vscan, 1) == MAX2(drm->vscan, 1) &&
+      wsi->flags == drm->flags;
+}
+
+static double
+wsi_display_mode_refresh(struct wsi_display_mode *wsi)
+{
+   return (double) wsi->clock * 1000.0 / ((double) wsi->htotal *
+                                          (double) wsi->vtotal *
+                                          (double) MAX2(wsi->vscan, 1));
+}
+
+static uint64_t wsi_get_current_monotonic(void)
+{
+   struct timespec tv;
+
+   clock_gettime(CLOCK_MONOTONIC, &tv);
+   return tv.tv_nsec + tv.tv_sec*1000000000ull;
+}
+
+static uint64_t wsi_rel_to_abs_time(uint64_t rel_time)
+{
+   uint64_t current_time = wsi_get_current_monotonic();
+
+   /* check for overflow */
+   if (rel_time > UINT64_MAX - current_time)
+      return UINT64_MAX;
+
+   return current_time + rel_time;
+}
+
+static struct wsi_display_mode *
+wsi_display_find_drm_mode(struct wsi_device *wsi_device,
+                          struct wsi_display_connector *connector,
+                          drmModeModeInfoPtr mode)
+{
+   wsi_for_each_display_mode(display_mode, connector) {
+      if (wsi_display_mode_matches_drm(display_mode, mode))
+         return display_mode;
+   }
+   return NULL;
+}
+
+static void
+wsi_display_invalidate_connector_modes(struct wsi_device *wsi_device,
+                                       struct wsi_display_connector *connector)
+{
+   wsi_for_each_display_mode(display_mode, connector) {
+      display_mode->valid = false;
+   }
+}
+
+static VkResult
+wsi_display_register_drm_mode(struct wsi_device *wsi_device,
+                              struct wsi_display_connector *connector,
+                              drmModeModeInfoPtr drm_mode)
+{
+   struct wsi_display *wsi =
+      (struct wsi_display *) wsi_device->wsi[VK_ICD_WSI_PLATFORM_DISPLAY];
+   struct wsi_display_mode *display_mode =
+      wsi_display_find_drm_mode(wsi_device, connector, drm_mode);
+
+   if (display_mode) {
+      display_mode->valid = true;
+      return VK_SUCCESS;
+   }
+
+   display_mode = vk_zalloc(wsi->alloc, sizeof (struct wsi_display_mode),
+                            8, VK_SYSTEM_ALLOCATION_SCOPE_INSTANCE);
+   if (!display_mode)
+      return VK_ERROR_OUT_OF_HOST_MEMORY;
+
+   display_mode->connector = connector;
+   display_mode->valid = true;
+   display_mode->preferred = (drm_mode->type & DRM_MODE_TYPE_PREFERRED) != 0;
+   display_mode->clock = drm_mode->clock; /* kHz */
+   display_mode->hdisplay = drm_mode->hdisplay;
+   display_mode->hsync_start = drm_mode->hsync_start;
+   display_mode->hsync_end = drm_mode->hsync_end;
+   display_mode->htotal = drm_mode->htotal;
+   display_mode->hskew = drm_mode->hskew;
+   display_mode->vdisplay = drm_mode->vdisplay;
+   display_mode->vsync_start = drm_mode->vsync_start;
+   display_mode->vsync_end = drm_mode->vsync_end;
+   display_mode->vtotal = drm_mode->vtotal;
+   display_mode->vscan = drm_mode->vscan;
+   display_mode->flags = drm_mode->flags;
+
+   list_addtail(&display_mode->list, &connector->display_modes);
+   return VK_SUCCESS;
+}
+
+/*
+ * Update our information about a specific connector
+ */
+
+static struct wsi_display_connector *
+wsi_display_find_connector(struct wsi_device *wsi_device,
+                          uint32_t connector_id)
+{
+   struct wsi_display *wsi =
+      (struct wsi_display *) wsi_device->wsi[VK_ICD_WSI_PLATFORM_DISPLAY];
+
+   wsi_for_each_connector(connector, wsi) {
+      if (connector->id == connector_id)
+         return connector;
+   }
+
+   return NULL;
+}
+
+static struct wsi_display_connector *
+wsi_display_alloc_connector(struct wsi_display *wsi,
+                            uint32_t connector_id)
+{
+   struct wsi_display_connector *connector =
+      vk_zalloc(wsi->alloc, sizeof (struct wsi_display_connector),
+                8, VK_SYSTEM_ALLOCATION_SCOPE_INSTANCE);
+
+   connector->id = connector_id;
+   connector->wsi = wsi;
+   connector->active = false;
+   /* XXX use EDID name */
+   connector->name = "monitor";
+   list_inithead(&connector->display_modes);
+   return connector;
+}
+
+static struct wsi_display_connector *
+wsi_display_get_connector(struct wsi_device *wsi_device,
+                          uint32_t connector_id)
+{
+   struct wsi_display *wsi =
+      (struct wsi_display *) wsi_device->wsi[VK_ICD_WSI_PLATFORM_DISPLAY];
+
+   if (wsi->fd < 0)
+      return NULL;
+
+   drmModeConnectorPtr drm_connector =
+      drmModeGetConnector(wsi->fd, connector_id);
+
+   if (!drm_connector)
+      return NULL;
+
+   struct wsi_display_connector *connector =
+      wsi_display_find_connector(wsi_device, connector_id);
+
+   if (!connector) {
+      connector = wsi_display_alloc_connector(wsi, connector_id);
+      if (!connector) {
+         drmModeFreeConnector(drm_connector);
+         return NULL;
+      }
+      list_addtail(&connector->list, &wsi->connectors);
+   }
+
+   connector->connected = drm_connector->connection != DRM_MODE_DISCONNECTED;
+
+   /* Mark all connector modes as invalid */
+   wsi_display_invalidate_connector_modes(wsi_device, connector);
+
+   /*
+    * List current modes, adding new ones and marking existing ones as
+    * valid
+    */
+   for (int m = 0; m < drm_connector->count_modes; m++) {
+      VkResult result = wsi_display_register_drm_mode(wsi_device,
+                                                      connector,
+                                                      &drm_connector->modes[m]);
+      if (result != VK_SUCCESS) {
+         drmModeFreeConnector(drm_connector);
+         return NULL;
+      }
+   }
+
+   drmModeFreeConnector(drm_connector);
+
+   return connector;
+}
+
+#define MM_PER_PIXEL     (1.0/96.0 * 25.4)
+
+static uint32_t
+mode_size(struct wsi_display_mode *mode)
+{
+   /* fortunately, these are both uint16_t, so this is easy */
+   return (uint32_t) mode->hdisplay * (uint32_t) mode->vdisplay;
+}
+
+static void
+wsi_display_fill_in_display_properties(struct wsi_device *wsi_device,
+                                       struct wsi_display_connector *connector,
+                                       VkDisplayPropertiesKHR *properties)
+{
+   properties->display = wsi_display_connector_to_handle(connector);
+   properties->displayName = connector->name;
+
+   /* Find the first preferred mode and assume that's the physical
+    * resolution. If there isn't a preferred mode, find the largest mode and
+    * use that.
+    */
+
+   struct wsi_display_mode *preferred_mode = NULL, *largest_mode = NULL;
+   wsi_for_each_display_mode(display_mode, connector) {
+      if (!display_mode->valid)
+         continue;
+      if (display_mode->preferred) {
+         preferred_mode = display_mode;
+         break;
+      }
+      if (largest_mode == NULL ||
+          mode_size(display_mode) > mode_size(largest_mode))
+      {
+         largest_mode = display_mode;
+      }
+   }
+
+   if (preferred_mode) {
+      properties->physicalResolution.width = preferred_mode->hdisplay;
+      properties->physicalResolution.height = preferred_mode->vdisplay;
+   } else if (largest_mode) {
+      properties->physicalResolution.width = largest_mode->hdisplay;
+      properties->physicalResolution.height = largest_mode->vdisplay;
+   } else {
+      properties->physicalResolution.width = 1024;
+      properties->physicalResolution.height = 768;
+   }
+
+   /* Make up physical size based on 96dpi */
+   properties->physicalDimensions.width =
+      floor(properties->physicalResolution.width * MM_PER_PIXEL + 0.5);
+   properties->physicalDimensions.height =
+      floor(properties->physicalResolution.height * MM_PER_PIXEL + 0.5);
+
+   properties->supportedTransforms = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR;
+   properties->planeReorderPossible = VK_FALSE;
+   properties->persistentContent = VK_FALSE;
+}
+
+/*
+ * Implement vkGetPhysicalDeviceDisplayPropertiesKHR (VK_KHR_display)
+ */
+VkResult
+wsi_display_get_physical_device_display_properties(
+   VkPhysicalDevice physical_device,
+   struct wsi_device *wsi_device,
+   uint32_t *property_count,
+   VkDisplayPropertiesKHR *properties)
+{
+   struct wsi_display *wsi =
+      (struct wsi_display *) wsi_device->wsi[VK_ICD_WSI_PLATFORM_DISPLAY];
+
+   if (wsi->fd < 0)
+      goto bail;
+
+   drmModeResPtr mode_res = drmModeGetResources(wsi->fd);
+
+   if (!mode_res)
+      goto bail;
+
+   VK_OUTARRAY_MAKE(conn, properties, property_count);
+
+   /* Get current information */
+
+   for (int c = 0; c < mode_res->count_connectors; c++) {
+      struct wsi_display_connector *connector =
+         wsi_display_get_connector(wsi_device, mode_res->connectors[c]);
+
+      if (!connector) {
+         drmModeFreeResources(mode_res);
+         return VK_ERROR_OUT_OF_HOST_MEMORY;
+      }
+
+      if (connector->connected) {
+         vk_outarray_append(&conn, prop) {
+            wsi_display_fill_in_display_properties(wsi_device,
+                                                   connector,
+                                                   prop);
+         }
+      }
+   }
+
+   drmModeFreeResources(mode_res);
+
+   return vk_outarray_status(&conn);
+
+bail:
+   *property_count = 0;
+   return VK_SUCCESS;
+}
+
+/*
+ * Implement vkGetPhysicalDeviceDisplayPlanePropertiesKHR (VK_KHR_display
+ */
+VkResult
+wsi_display_get_physical_device_display_plane_properties(
+   VkPhysicalDevice physical_device,
+   struct wsi_device *wsi_device,
+   uint32_t *property_count,
+   VkDisplayPlanePropertiesKHR *properties)
+{
+   struct wsi_display *wsi =
+      (struct wsi_display *) wsi_device->wsi[VK_ICD_WSI_PLATFORM_DISPLAY];
+
+   VK_OUTARRAY_MAKE(conn, properties, property_count);
+
+   wsi_for_each_connector(connector, wsi) {
+      vk_outarray_append(&conn, prop) {
+         if (connector && connector->active) {
+            prop->currentDisplay = wsi_display_connector_to_handle(connector);
+            prop->currentStackIndex = 0;
+         } else {
+            prop->currentDisplay = VK_NULL_HANDLE;
+            prop->currentStackIndex = 0;
+         }
+      }
+   }
+   return vk_outarray_status(&conn);
+}
+
+/*
+ * Implement vkGetDisplayPlaneSupportedDisplaysKHR (VK_KHR_display)
+ */
+
+VkResult
+wsi_display_get_display_plane_supported_displays(
+   VkPhysicalDevice physical_device,
+   struct wsi_device *wsi_device,
+   uint32_t plane_index,
+   uint32_t *display_count,
+   VkDisplayKHR *displays)
+{
+   struct wsi_display *wsi =
+      (struct wsi_display *) wsi_device->wsi[VK_ICD_WSI_PLATFORM_DISPLAY];
+
+   VK_OUTARRAY_MAKE(conn, displays, display_count);
+
+   int c = 0;
+
+   wsi_for_each_connector(connector, wsi) {
+      if (c == plane_index && connector->connected) {
+         vk_outarray_append(&conn, display) {
+            *display = wsi_display_connector_to_handle(connector);
+         }
+      }
+      c++;
+   }
+   return vk_outarray_status(&conn);
+}
+
+/*
+ * Implement vkGetDisplayModePropertiesKHR (VK_KHR_display)
+ */
+
+VkResult
+wsi_display_get_display_mode_properties(VkPhysicalDevice physical_device,
+                                        struct wsi_device *wsi_device,
+                                        VkDisplayKHR display,
+                                        uint32_t *property_count,
+                                        VkDisplayModePropertiesKHR *properties)
+{
+   struct wsi_display_connector *connector =
+      wsi_display_connector_from_handle(display);
+
+   VK_OUTARRAY_MAKE(conn, properties, property_count);
+
+   wsi_for_each_display_mode(display_mode, connector) {
+      if (display_mode->valid) {
+         vk_outarray_append(&conn, prop) {
+            prop->displayMode = wsi_display_mode_to_handle(display_mode);
+            prop->parameters.visibleRegion.width = display_mode->hdisplay;
+            prop->parameters.visibleRegion.height = display_mode->vdisplay;
+            prop->parameters.refreshRate =
+               (uint32_t) (wsi_display_mode_refresh(display_mode) * 1000 + 0.5);
+         }
+      }
+   }
+   return vk_outarray_status(&conn);
+}
+
+static bool
+wsi_display_mode_matches_vk(wsi_display_mode *wsi,
+                            const VkDisplayModeParametersKHR *vk)
+{
+   return (vk->visibleRegion.width == wsi->hdisplay &&
+           vk->visibleRegion.height == wsi->vdisplay &&
+           fabs(wsi_display_mode_refresh(wsi) * 1000.0 - vk->refreshRate) < 10);
+}
+
+/*
+ * Implement vkCreateDisplayModeKHR (VK_KHR_display)
+ */
+VkResult
+wsi_display_create_display_mode(VkPhysicalDevice physical_device,
+                                struct wsi_device *wsi_device,
+                                VkDisplayKHR display,
+                                const VkDisplayModeCreateInfoKHR *create_info,
+                                const VkAllocationCallbacks *allocator,
+                                VkDisplayModeKHR *mode)
+{
+   struct wsi_display_connector *connector =
+      wsi_display_connector_from_handle(display);
+
+   if (create_info->flags != 0)
+      return VK_ERROR_INITIALIZATION_FAILED;
+
+   /* Check and see if the requested mode happens to match an existing one and
+    * return that. This makes the conformance suite happy. Doing more than
+    * this would involve embedding the CVT function into the driver, which seems
+    * excessive.
+    */
+   wsi_for_each_display_mode(display_mode, connector) {
+      if (display_mode->valid) {
+         if (wsi_display_mode_matches_vk(display_mode, &create_info->parameters)) {
+            *mode = wsi_display_mode_to_handle(display_mode);
+            return VK_SUCCESS;
+         }
+      }
+   }
+   return VK_ERROR_INITIALIZATION_FAILED;
+}
+
+/*
+ * Implement vkGetDisplayPlaneCapabilities
+ */
+VkResult
+wsi_get_display_plane_capabilities(VkPhysicalDevice physical_device,
+                                   struct wsi_device *wsi_device,
+                                   VkDisplayModeKHR mode_khr,
+                                   uint32_t plane_index,
+                                   VkDisplayPlaneCapabilitiesKHR *capabilities)
+{
+   struct wsi_display_mode *mode = wsi_display_mode_from_handle(mode_khr);
+
+   /* XXX use actual values */
+   capabilities->supportedAlpha = VK_DISPLAY_PLANE_ALPHA_OPAQUE_BIT_KHR;
+   capabilities->minSrcPosition.x = 0;
+   capabilities->minSrcPosition.y = 0;
+   capabilities->maxSrcPosition.x = 0;
+   capabilities->maxSrcPosition.y = 0;
+   capabilities->minSrcExtent.width = mode->hdisplay;
+   capabilities->minSrcExtent.height = mode->vdisplay;
+   capabilities->maxSrcExtent.width = mode->hdisplay;
+   capabilities->maxSrcExtent.height = mode->vdisplay;
+   capabilities->minDstPosition.x = 0;
+   capabilities->minDstPosition.y = 0;
+   capabilities->maxDstPosition.x = 0;
+   capabilities->maxDstPosition.y = 0;
+   capabilities->minDstExtent.width = mode->hdisplay;
+   capabilities->minDstExtent.height = mode->vdisplay;
+   capabilities->maxDstExtent.width = mode->hdisplay;
+   capabilities->maxDstExtent.height = mode->vdisplay;
+   return VK_SUCCESS;
+}
+
+VkResult
+wsi_create_display_surface(VkInstance instance,
+                           const VkAllocationCallbacks *allocator,
+                           const VkDisplaySurfaceCreateInfoKHR *create_info,
+                           VkSurfaceKHR *surface_khr)
+{
+   VkIcdSurfaceDisplay *surface = vk_zalloc(allocator, sizeof *surface, 8,
+                                            VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
+
+   if (surface == NULL)
+      return VK_ERROR_OUT_OF_HOST_MEMORY;
+
+   surface->base.platform = VK_ICD_WSI_PLATFORM_DISPLAY;
+
+   surface->displayMode = create_info->displayMode;
+   surface->planeIndex = create_info->planeIndex;
+   surface->planeStackIndex = create_info->planeStackIndex;
+   surface->transform = create_info->transform;
+   surface->globalAlpha = create_info->globalAlpha;
+   surface->alphaMode = create_info->alphaMode;
+   surface->imageExtent = create_info->imageExtent;
+
+   *surface_khr = VkIcdSurfaceBase_to_handle(&surface->base);
+   return VK_SUCCESS;
+}
+
+
+static VkResult
+wsi_display_surface_get_support(VkIcdSurfaceBase *surface,
+                                struct wsi_device *wsi_device,
+                                const VkAllocationCallbacks *allocator,
+                                uint32_t queueFamilyIndex,
+                                int local_fd,
+                                VkBool32* pSupported)
+{
+   *pSupported = VK_TRUE;
+   return VK_SUCCESS;
+}
+
+static VkResult
+wsi_display_surface_get_capabilities(VkIcdSurfaceBase *surface_base,
+                                     VkSurfaceCapabilitiesKHR* caps)
+{
+   VkIcdSurfaceDisplay *surface = (VkIcdSurfaceDisplay *) surface_base;
+   wsi_display_mode *mode = wsi_display_mode_from_handle(surface->displayMode);
+
+   caps->currentExtent.width = mode->hdisplay;
+   caps->currentExtent.height = mode->vdisplay;
+
+   /* XXX Figure out extents based on driver capabilities */
+   caps->maxImageExtent = caps->minImageExtent = caps->currentExtent;
+
+   caps->supportedCompositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
+
+   caps->minImageCount = 2;
+   caps->maxImageCount = 0;
+
+   caps->supportedTransforms = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR;
+   caps->currentTransform = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR;
+   caps->maxImageArrayLayers = 1;
+   caps->supportedUsageFlags =
+      VK_IMAGE_USAGE_TRANSFER_SRC_BIT |
+      VK_IMAGE_USAGE_SAMPLED_BIT |
+      VK_IMAGE_USAGE_TRANSFER_DST_BIT |
+      VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;
+
+   return VK_SUCCESS;
+}
+
+static VkResult
+wsi_display_surface_get_capabilities2(VkIcdSurfaceBase *icd_surface,
+                                      const void *info_next,
+                                      VkSurfaceCapabilities2KHR *caps)
+{
+   assert(caps->sType == VK_STRUCTURE_TYPE_SURFACE_CAPABILITIES_2_KHR);
+
+   return wsi_display_surface_get_capabilities(icd_surface,
+                                               &caps->surfaceCapabilities);
+}
+
+static const struct {
+   VkFormat     format;
+   uint32_t     drm_format;
+} available_surface_formats[] = {
+   { .format = VK_FORMAT_B8G8R8A8_SRGB, .drm_format = DRM_FORMAT_XRGB8888 },
+   { .format = VK_FORMAT_B8G8R8A8_UNORM, .drm_format = DRM_FORMAT_XRGB8888 },
+};
+
+static VkResult
+wsi_display_surface_get_formats(VkIcdSurfaceBase *icd_surface,
+                                struct wsi_device *wsi_device,
+                                uint32_t *surface_format_count,
+                                VkSurfaceFormatKHR *surface_formats)
+{
+   VK_OUTARRAY_MAKE(out, surface_formats, surface_format_count);
+
+   for (unsigned i = 0; i < ARRAY_SIZE(available_surface_formats); i++) {
+      vk_outarray_append(&out, f) {
+         f->format = available_surface_formats[i].format;
+         f->colorSpace = VK_COLORSPACE_SRGB_NONLINEAR_KHR;
+      }
+   }
+
+   return vk_outarray_status(&out);
+}
+
+static VkResult
+wsi_display_surface_get_formats2(VkIcdSurfaceBase *surface,
+                                 struct wsi_device *wsi_device,
+                                 const void *info_next,
+                                 uint32_t *surface_format_count,
+                                 VkSurfaceFormat2KHR *surface_formats)
+{
+   VK_OUTARRAY_MAKE(out, surface_formats, surface_format_count);
+
+   for (unsigned i = 0; i < ARRAY_SIZE(available_surface_formats); i++) {
+      vk_outarray_append(&out, f) {
+         assert(f->sType == VK_STRUCTURE_TYPE_SURFACE_FORMAT_2_KHR);
+         f->surfaceFormat.format = available_surface_formats[i].format;
+         f->surfaceFormat.colorSpace = VK_COLORSPACE_SRGB_NONLINEAR_KHR;
+      }
+   }
+
+   return vk_outarray_status(&out);
+}
+
+static VkResult
+wsi_display_surface_get_present_modes(VkIcdSurfaceBase *surface,
+                                      uint32_t *present_mode_count,
+                                      VkPresentModeKHR *present_modes)
+{
+   VK_OUTARRAY_MAKE(conn, present_modes, present_mode_count);
+
+   vk_outarray_append(&conn, present) {
+      *present = VK_PRESENT_MODE_FIFO_KHR;
+   }
+
+   return vk_outarray_status(&conn);
+}
+
+static void
+wsi_display_destroy_buffer(struct wsi_display *wsi,
+                           uint32_t buffer)
+{
+   (void) drmIoctl(wsi->fd, DRM_IOCTL_MODE_DESTROY_DUMB,
+                   &((struct drm_mode_destroy_dumb) { .handle = buffer }));
+}
+
+static VkResult
+wsi_display_image_init(VkDevice device_h,
+                       struct wsi_swapchain *drv_chain,
+                       const VkSwapchainCreateInfoKHR *create_info,
+                       const VkAllocationCallbacks *allocator,
+                       struct wsi_display_image *image)
+{
+   struct wsi_display_swapchain *chain =
+      (struct wsi_display_swapchain *) drv_chain;
+   struct wsi_display *wsi = chain->wsi;
+   uint32_t drm_format = 0;
+
+   for (unsigned i = 0; i < ARRAY_SIZE(available_surface_formats); i++) {
+      if (create_info->imageFormat == available_surface_formats[i].format) {
+         drm_format = available_surface_formats[i].drm_format;
+         break;
+      }
+   }
+
+   /* the application provided an invalid format, bail */
+   if (drm_format == 0)
+      return VK_ERROR_DEVICE_LOST;
+
+   VkResult result = wsi_create_native_image(&chain->base, create_info,
+                                             0, NULL, NULL,
+                                             &image->base);
+   if (result != VK_SUCCESS)
+      return result;
+
+   memset(image->buffer, 0, sizeof (image->buffer));
+
+   for (unsigned int i = 0; i < image->base.num_planes; i++) {
+      int ret = drmPrimeFDToHandle(wsi->fd, image->base.fds[i],
+                                   &image->buffer[i]);
+
+      close(image->base.fds[i]);
+      image->base.fds[i] = -1;
+      if (ret < 0)
+         goto fail_handle;
+   }
+
+   image->chain = chain;
+   image->state = WSI_IMAGE_IDLE;
+   image->fb_id = 0;
+
+   int ret = drmModeAddFB2(wsi->fd,
+                           create_info->imageExtent.width,
+                           create_info->imageExtent.height,
+                           drm_format,
+                           image->buffer,
+                           image->base.row_pitches,
+                           image->base.offsets,
+                           &image->fb_id, 0);
+
+   if (ret)
+      goto fail_fb;
+
+   return VK_SUCCESS;
+
+fail_fb:
+fail_handle:
+   for (unsigned int i = 0; i < image->base.num_planes; i++) {
+      if (image->buffer[i])
+         wsi_display_destroy_buffer(wsi, image->buffer[i]);
+      if (image->base.fds[i] != -1) {
+         close(image->base.fds[i]);
+         image->base.fds[i] = -1;
+      }
+   }
+
+   wsi_destroy_image(&chain->base, &image->base);
+
+   return VK_ERROR_OUT_OF_HOST_MEMORY;
+}
+
+static void
+wsi_display_image_finish(struct wsi_swapchain *drv_chain,
+                         const VkAllocationCallbacks *allocator,
+                         struct wsi_display_image *image)
+{
+   struct wsi_display_swapchain *chain =
+      (struct wsi_display_swapchain *) drv_chain;
+   struct wsi_display *wsi = chain->wsi;
+
+   drmModeRmFB(wsi->fd, image->fb_id);
+   for (unsigned int i = 0; i < image->base.num_planes; i++)
+      wsi_display_destroy_buffer(wsi, image->buffer[i]);
+   wsi_destroy_image(&chain->base, &image->base);
+}
+
+static VkResult
+wsi_display_swapchain_destroy(struct wsi_swapchain *drv_chain,
+                              const VkAllocationCallbacks *allocator)
+{
+   struct wsi_display_swapchain *chain =
+      (struct wsi_display_swapchain *) drv_chain;
+
+   for (uint32_t i = 0; i < chain->base.image_count; i++)
+      wsi_display_image_finish(drv_chain, allocator, &chain->images[i]);
+   vk_free(allocator, chain);
+   return VK_SUCCESS;
+}
+
+static struct wsi_image *
+wsi_display_get_wsi_image(struct wsi_swapchain *drv_chain,
+                          uint32_t image_index)
+{
+   struct wsi_display_swapchain *chain =
+      (struct wsi_display_swapchain *) drv_chain;
+
+   return &chain->images[image_index].base;
+}
+
+static void
+wsi_display_idle_old_displaying(struct wsi_display_image *active_image)
+{
+   struct wsi_display_swapchain *chain = active_image->chain;
+
+   wsi_display_debug("idle everyone but %ld\n",
+                     active_image - &(chain->images[0]));
+   for (uint32_t i = 0; i < chain->base.image_count; i++)
+      if (chain->images[i].state == WSI_IMAGE_DISPLAYING &&
+          &chain->images[i] != active_image)
+      {
+         wsi_display_debug("idle %d\n", i);
+         chain->images[i].state = WSI_IMAGE_IDLE;
+      }
+}
+
+static VkResult
+_wsi_display_queue_next(struct wsi_swapchain *drv_chain);
+
+static void
+wsi_display_page_flip_handler2(int fd,
+                               unsigned int frame,
+                               unsigned int sec,
+                               unsigned int usec,
+                               uint32_t crtc_id,
+                               void *data)
+{
+   struct wsi_display_image *image = data;
+   struct wsi_display_swapchain *chain = image->chain;
+
+   wsi_display_debug("image %ld displayed at %d\n",
+                     image - &(image->chain->images[0]), frame);
+   image->state = WSI_IMAGE_DISPLAYING;
+   wsi_display_idle_old_displaying(image);
+   VkResult result = _wsi_display_queue_next(&(chain->base));
+   if (result != VK_SUCCESS)
+      chain->status = result;
+}
+
+static void wsi_display_page_flip_handler(int fd,
+                                          unsigned int frame,
+                                          unsigned int sec,
+                                          unsigned int usec,
+                                          void *data)
+{
+   wsi_display_page_flip_handler2(fd, frame, sec, usec, 0, data);
+}
+
+static drmEventContext event_context = {
+   .version = DRM_EVENT_CONTEXT_VERSION,
+   .page_flip_handler = wsi_display_page_flip_handler,
+#if DRM_EVENT_CONTEXT_VERSION >= 3
+   .page_flip_handler2 = wsi_display_page_flip_handler2,
+#endif
+};
+
+static void *
+wsi_display_wait_thread(void *data)
+{
+   struct wsi_display *wsi = data;
+   struct pollfd pollfd = {
+      .fd = wsi->fd,
+      .events = POLLIN
+   };
+
+   pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
+   for (;;) {
+      int ret = poll(&pollfd, 1, -1);
+      if (ret > 0) {
+         pthread_mutex_lock(&wsi->wait_mutex);
+         (void) drmHandleEvent(wsi->fd, &event_context);
+         pthread_mutex_unlock(&wsi->wait_mutex);
+         pthread_cond_broadcast(&wsi->wait_cond);
+      }
+   }
+   return NULL;
+}
+
+static int
+wsi_display_start_wait_thread(struct wsi_display *wsi)
+{
+   if (!wsi->wait_thread) {
+      int ret = pthread_create(&wsi->wait_thread, NULL,
+                               wsi_display_wait_thread, wsi);
+      if (ret)
+         return ret;
+   }
+   return 0;
+}
+
+/*
+ * Wait for at least one event from the kernel to be processed.
+ * Call with wait_mutex held
+ */
+static int
+wsi_display_wait_for_event(struct wsi_display *wsi,
+                           uint64_t timeout_ns)
+{
+   int ret;
+
+   ret = wsi_display_start_wait_thread(wsi);
+
+   if (ret)
+      return ret;
+
+   struct timespec abs_timeout = {
+      .tv_sec = timeout_ns / 1000000000ULL,
+      .tv_nsec = timeout_ns % 1000000000ULL,
+   };
+
+   ret = pthread_cond_timedwait(&wsi->wait_cond, &wsi->wait_mutex,
+                                &abs_timeout);
+
+   wsi_display_debug("%9ld done waiting for event %d\n", pthread_self(), ret);
+   return ret;
+}
+
+static VkResult
+wsi_display_acquire_next_image(struct wsi_swapchain *drv_chain,
+                               uint64_t timeout,
+                               VkSemaphore semaphore,
+                               uint32_t *image_index)
+{
+   struct wsi_display_swapchain *chain =
+      (struct wsi_display_swapchain *)drv_chain;
+   struct wsi_display *wsi = chain->wsi;
+   int ret = 0;
+   VkResult result = VK_SUCCESS;
+
+   /* Bail early if the swapchain is broken */
+   if (chain->status != VK_SUCCESS)
+      return chain->status;
+
+   if (timeout != 0 && timeout != UINT64_MAX)
+      timeout = wsi_rel_to_abs_time(timeout);
+
+   pthread_mutex_lock(&wsi->wait_mutex);
+   for (;;) {
+      for (uint32_t i = 0; i < chain->base.image_count; i++) {
+         if (chain->images[i].state == WSI_IMAGE_IDLE) {
+            *image_index = i;
+            wsi_display_debug("image %d available\n", i);
+            chain->images[i].state = WSI_IMAGE_DRAWING;
+            result = VK_SUCCESS;
+            goto done;
+         }
+         wsi_display_debug("image %d state %d\n", i, chain->images[i].state);
+      }
+
+      if (ret == ETIMEDOUT) {
+         result = VK_TIMEOUT;
+         goto done;
+      }
+
+      ret = wsi_display_wait_for_event(wsi, timeout);
+
+      if (ret && ret != ETIMEDOUT) {
+         result = VK_ERROR_OUT_OF_DATE_KHR;
+         goto done;
+      }
+   }
+done:
+   pthread_mutex_unlock(&wsi->wait_mutex);
+
+   if (result != VK_SUCCESS)
+      return result;
+
+   return chain->status;
+}
+
+/*
+ * Check whether there are any other connectors driven by this crtc
+ */
+static bool
+wsi_display_crtc_solo(struct wsi_display *wsi,
+                      drmModeResPtr mode_res,
+                      drmModeConnectorPtr connector,
+                      uint32_t crtc_id)
+{
+   /* See if any other connectors share the same encoder */
+   for (int c = 0; c < mode_res->count_connectors; c++) {
+      if (mode_res->connectors[c] == connector->connector_id)
+         continue;
+
+      drmModeConnectorPtr other_connector =
+         drmModeGetConnector(wsi->fd, mode_res->connectors[c]);
+
+      if (other_connector) {
+         bool match = (other_connector->encoder_id == connector->encoder_id);
+         drmModeFreeConnector(other_connector);
+         if (match)
+            return false;
+      }
+   }
+
+   /* See if any other encoders share the same crtc */
+   for (int e = 0; e < mode_res->count_encoders; e++) {
+      if (mode_res->encoders[e] == connector->encoder_id)
+         continue;
+
+      drmModeEncoderPtr other_encoder =
+         drmModeGetEncoder(wsi->fd, mode_res->encoders[e]);
+
+      if (other_encoder) {
+         bool match = (other_encoder->crtc_id == crtc_id);
+         drmModeFreeEncoder(other_encoder);
+         if (match)
+            return false;
+      }
+   }
+   return true;
+}
+
+/*
+ * Pick a suitable CRTC to drive this connector. Prefer a CRTC which is
+ * currently driving this connector and not any others. Settle for a CRTC
+ * which is currently idle.
+ */
+static uint32_t
+wsi_display_select_crtc(struct wsi_display_connector *connector,
+                        drmModeResPtr mode_res,
+                        drmModeConnectorPtr drm_connector)
+{
+   struct wsi_display *wsi = connector->wsi;
+
+   /* See what CRTC is currently driving this connector */
+   if (drm_connector->encoder_id) {
+      drmModeEncoderPtr encoder =
+         drmModeGetEncoder(wsi->fd, drm_connector->encoder_id);
+
+      if (encoder) {
+         uint32_t crtc_id = encoder->crtc_id;
+         drmModeFreeEncoder(encoder);
+         if (crtc_id) {
+            if (wsi_display_crtc_solo(wsi, mode_res, drm_connector, crtc_id))
+               return crtc_id;
+         }
+      }
+   }
+   uint32_t crtc_id = 0;
+   for (int c = 0; crtc_id == 0 && c < mode_res->count_crtcs; c++) {
+      drmModeCrtcPtr crtc = drmModeGetCrtc(wsi->fd, mode_res->crtcs[c]);
+      if (crtc && crtc->buffer_id == 0)
+         crtc_id = crtc->crtc_id;
+      drmModeFreeCrtc(crtc);
+   }
+   return crtc_id;
+}
+
+static VkResult
+wsi_display_setup_connector(wsi_display_connector *connector,
+                            wsi_display_mode *display_mode)
+{
+   struct wsi_display *wsi = connector->wsi;
+
+   if (connector->current_mode == display_mode && connector->crtc_id)
+      return VK_SUCCESS;
+
+   VkResult result = VK_SUCCESS;
+
+   drmModeResPtr mode_res = drmModeGetResources(wsi->fd);
+   if (!mode_res) {
+      if (errno == ENOMEM)
+         result = VK_ERROR_OUT_OF_HOST_MEMORY;
+      else
+         result = VK_ERROR_OUT_OF_DATE_KHR;
+      goto bail;
+   }
+
+   drmModeConnectorPtr drm_connector =
+      drmModeGetConnectorCurrent(wsi->fd, connector->id);
+
+   if (!drm_connector) {
+      if (errno == ENOMEM)
+         result = VK_ERROR_OUT_OF_HOST_MEMORY;
+      else
+         result = VK_ERROR_OUT_OF_DATE_KHR;
+      goto bail_mode_res;
+   }
+
+   /* Pick a CRTC if we don't have one */
+   if (!connector->crtc_id) {
+      connector->crtc_id = wsi_display_select_crtc(connector,
+                                                   mode_res, drm_connector);
+      if (!connector->crtc_id) {
+         result = VK_ERROR_OUT_OF_DATE_KHR;
+         goto bail_connector;
+      }
+   }
+
+   if (connector->current_mode != display_mode) {
+
+      /* Find the drm mode corresponding to the requested VkDisplayMode */
+      drmModeModeInfoPtr drm_mode = NULL;
+
+      for (int m = 0; m < drm_connector->count_modes; m++) {
+         drm_mode = &drm_connector->modes[m];
+         if (wsi_display_mode_matches_drm(display_mode, drm_mode))
+            break;
+         drm_mode = NULL;
+      }
+
+      if (!drm_mode) {
+         result = VK_ERROR_OUT_OF_DATE_KHR;
+         goto bail_connector;
+      }
+
+      connector->current_mode = display_mode;
+      connector->current_drm_mode = *drm_mode;
+   }
+
+bail_connector:
+   drmModeFreeConnector(drm_connector);
+bail_mode_res:
+   drmModeFreeResources(mode_res);
+bail:
+   return result;
+
+}
+
+/*
+ * Check to see if the kernel has no flip queued and if there's an image
+ * waiting to be displayed.
+ */
+static VkResult
+_wsi_display_queue_next(struct wsi_swapchain *drv_chain)
+{
+   struct wsi_display_swapchain *chain =
+      (struct wsi_display_swapchain *) drv_chain;
+   struct wsi_display *wsi = chain->wsi;
+   VkIcdSurfaceDisplay *surface = chain->surface;
+   wsi_display_mode *display_mode =
+      wsi_display_mode_from_handle(surface->displayMode);
+   wsi_display_connector *connector = display_mode->connector;
+
+   if (wsi->fd < 0)
+      return VK_ERROR_OUT_OF_DATE_KHR;
+
+   if (display_mode != connector->current_mode)
+      connector->active = false;
+
+   for (;;) {
+
+      /* Check to see if there is an image to display, or if some image is
+       * already queued */
+
+      struct wsi_display_image *image = NULL;
+
+      for (uint32_t i = 0; i < chain->base.image_count; i++) {
+         struct wsi_display_image *tmp_image = &chain->images[i];
+
+         switch (tmp_image->state) {
+         case WSI_IMAGE_FLIPPING:
+            /* already flipping, don't send another to the kernel yet */
+            return VK_SUCCESS;
+         case WSI_IMAGE_QUEUED:
+            /* find the oldest queued */
+            if (!image || tmp_image->flip_sequence < image->flip_sequence)
+               image = tmp_image;
+            break;
+         default:
+            break;
+         }
+      }
+
+      if (!image)
+         return VK_SUCCESS;
+
+      int ret;
+      if (connector->active) {
+         ret = drmModePageFlip(wsi->fd, connector->crtc_id, image->fb_id,
+                                   DRM_MODE_PAGE_FLIP_EVENT, image);
+         if (ret == 0) {
+            image->state = WSI_IMAGE_FLIPPING;
+            return VK_SUCCESS;
+         }
+         wsi_display_debug("page flip err %d %s\n", ret, strerror(-ret));
+      } else {
+         ret = -EINVAL;
+      }
+
+      if (ret == -EINVAL) {
+         VkResult result = wsi_display_setup_connector(connector, display_mode);
+
+         if (result != VK_SUCCESS) {
+            image->state = WSI_IMAGE_IDLE;
+            return result;
+         }
+
+         /* XXX allow setting of position */
+         ret = drmModeSetCrtc(wsi->fd, connector->crtc_id,
+                              image->fb_id, 0, 0,
+                              &connector->id, 1,
+                              &connector->current_drm_mode);
+         if (ret == 0) {
+            /* Assume that the mode set is synchronous and that any
+             * previous image is now idle.
+             */
+            image->state = WSI_IMAGE_DISPLAYING;
+            wsi_display_idle_old_displaying(image);
+            connector->active = true;
+            return VK_SUCCESS;
+         }
+      }
+
+      if (ret != -EACCES) {
+         connector->active = false;
+         image->state = WSI_IMAGE_IDLE;
+         return VK_ERROR_OUT_OF_DATE_KHR;
+      }
+
+      /* Some other VT is currently active. Sit here waiting for
+       * our VT to become active again by polling once a second
+       */
+      usleep(1000 * 1000);
+      connector->active = false;
+   }
+}
+
+static VkResult
+wsi_display_queue_present(struct wsi_swapchain *drv_chain,
+                          uint32_t image_index,
+                          const VkPresentRegionKHR *damage)
+{
+   struct wsi_display_swapchain *chain =
+      (struct wsi_display_swapchain *) drv_chain;
+   struct wsi_display *wsi = chain->wsi;
+   struct wsi_display_image *image = &chain->images[image_index];
+   VkResult result;
+
+   /* Bail early if the swapchain is broken */
+   if (chain->status != VK_SUCCESS)
+      return chain->status;
+
+   assert(image->state == WSI_IMAGE_DRAWING);
+   wsi_display_debug("present %d\n", image_index);
+
+   pthread_mutex_lock(&wsi->wait_mutex);
+
+   image->flip_sequence = ++chain->flip_sequence;
+   image->state = WSI_IMAGE_QUEUED;
+
+   result = _wsi_display_queue_next(drv_chain);
+   if (result != VK_SUCCESS)
+      chain->status = result;
+
+   pthread_mutex_unlock(&wsi->wait_mutex);
+
+   if (result != VK_SUCCESS)
+      return result;
+
+   return chain->status;
+}
+
+static VkResult
+wsi_display_surface_create_swapchain(
+   VkIcdSurfaceBase *icd_surface,
+   VkDevice device,
+   struct wsi_device *wsi_device,
+   int local_fd,
+   const VkSwapchainCreateInfoKHR *create_info,
+   const VkAllocationCallbacks *allocator,
+   struct wsi_swapchain **swapchain_out)
+{
+   struct wsi_display *wsi =
+      (struct wsi_display *) wsi_device->wsi[VK_ICD_WSI_PLATFORM_DISPLAY];
+
+   assert(create_info->sType == VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR);
+
+   const unsigned num_images = create_info->minImageCount;
+   struct wsi_display_swapchain *chain =
+      vk_zalloc(allocator,
+                sizeof(*chain) + num_images * sizeof(chain->images[0]),
+                8, VK_SYSTEM_ALLOCATION_SCOPE_OBJECT);
+
+   if (chain == NULL)
+      return VK_ERROR_OUT_OF_HOST_MEMORY;
+
+   VkResult result = wsi_swapchain_init(wsi_device, &chain->base, device,
+                                        create_info, allocator);
+
+   chain->base.destroy = wsi_display_swapchain_destroy;
+   chain->base.get_wsi_image = wsi_display_get_wsi_image;
+   chain->base.acquire_next_image = wsi_display_acquire_next_image;
+   chain->base.queue_present = wsi_display_queue_present;
+   chain->base.present_mode = create_info->presentMode;
+   chain->base.image_count = num_images;
+
+   chain->wsi = wsi;
+   chain->status = VK_SUCCESS;
+
+   chain->surface = (VkIcdSurfaceDisplay *) icd_surface;
+
+   for (uint32_t image = 0; image < chain->base.image_count; image++) {
+      result = wsi_display_image_init(device, &chain->base,
+                                      create_info, allocator,
+                                      &chain->images[image]);
+      if (result != VK_SUCCESS) {
+         while (image > 0) {
+            --image;
+            wsi_display_image_finish(&chain->base, allocator,
+                                     &chain->images[image]);
+         }
+         vk_free(allocator, chain);
+         goto fail_init_images;
+      }
+   }
+
+   *swapchain_out = &chain->base;
+
+   return VK_SUCCESS;
+
+fail_init_images:
+   return result;
+}
+
+static bool
+wsi_init_pthread_cond_monotonic(pthread_cond_t *cond)
+{
+   pthread_condattr_t condattr;
+   bool ret = false;
+
+   if (pthread_condattr_init(&condattr) != 0)
+      goto fail_attr_init;
+
+   if (pthread_condattr_setclock(&condattr, CLOCK_MONOTONIC) != 0)
+      goto fail_attr_set;
+
+   if (pthread_cond_init(cond, &condattr) != 0)
+      goto fail_cond_init;
+
+   ret = true;
+
+fail_cond_init:
+fail_attr_set:
+   pthread_condattr_destroy(&condattr);
+fail_attr_init:
+   return ret;
+}
+
+VkResult
+wsi_display_init_wsi(struct wsi_device *wsi_device,
+                     const VkAllocationCallbacks *alloc,
+                     int display_fd)
+{
+   struct wsi_display *wsi = vk_zalloc(alloc, sizeof(*wsi), 8,
+                                       VK_SYSTEM_ALLOCATION_SCOPE_INSTANCE);
+   VkResult result;
+
+   if (!wsi) {
+      result = VK_ERROR_OUT_OF_HOST_MEMORY;
+      goto fail;
+   }
+
+   wsi->fd = display_fd;
+   wsi->alloc = alloc;
+
+   list_inithead(&wsi->connectors);
+
+   int ret = pthread_mutex_init(&wsi->wait_mutex, NULL);
+   if (ret) {
+      result = VK_ERROR_OUT_OF_HOST_MEMORY;
+      goto fail_mutex;
+   }
+
+   if (!wsi_init_pthread_cond_monotonic(&wsi->wait_cond)) {
+      result = VK_ERROR_OUT_OF_HOST_MEMORY;
+      goto fail_cond;
+   }
+
+   wsi->base.get_support = wsi_display_surface_get_support;
+   wsi->base.get_capabilities = wsi_display_surface_get_capabilities;
+   wsi->base.get_capabilities2 = wsi_display_surface_get_capabilities2;
+   wsi->base.get_formats = wsi_display_surface_get_formats;
+   wsi->base.get_formats2 = wsi_display_surface_get_formats2;
+   wsi->base.get_present_modes = wsi_display_surface_get_present_modes;
+   wsi->base.create_swapchain = wsi_display_surface_create_swapchain;
+
+   wsi_device->wsi[VK_ICD_WSI_PLATFORM_DISPLAY] = &wsi->base;
+
+   return VK_SUCCESS;
+
+fail_cond:
+   pthread_mutex_destroy(&wsi->wait_mutex);
+fail_mutex:
+   vk_free(alloc, wsi);
+fail:
+   return result;
+}
+
+void
+wsi_display_finish_wsi(struct wsi_device *wsi_device,
+                       const VkAllocationCallbacks *alloc)
+{
+   struct wsi_display *wsi =
+      (struct wsi_display *) wsi_device->wsi[VK_ICD_WSI_PLATFORM_DISPLAY];
+
+   if (wsi) {
+      wsi_for_each_connector(connector, wsi) {
+         wsi_for_each_display_mode(mode, connector) {
+            vk_free(wsi->alloc, mode);
+         }
+         vk_free(wsi->alloc, connector);
+      }
+
+      pthread_mutex_lock(&wsi->wait_mutex);
+      if (wsi->wait_thread) {
+         pthread_cancel(wsi->wait_thread);
+         pthread_join(wsi->wait_thread, NULL);
+      }
+      pthread_mutex_unlock(&wsi->wait_mutex);
+      pthread_mutex_destroy(&wsi->wait_mutex);
+      pthread_cond_destroy(&wsi->wait_cond);
+
+      vk_free(alloc, wsi);
+   }
+}
diff --git a/src/vulkan/wsi/wsi_common_display.h b/src/vulkan/wsi/wsi_common_display.h
new file mode 100644
index 00000000000..9ca1fa6be86
--- /dev/null
+++ b/src/vulkan/wsi/wsi_common_display.h
@@ -0,0 +1,85 @@
+/*
+ * Copyright © 2017 Keith Packard
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and its
+ * documentation for any purpose is hereby granted without fee, provided that
+ * the above copyright notice appear in all copies and that both that copyright
+ * notice and this permission notice appear in supporting documentation, and
+ * that the name of the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
+ * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
+ * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+ * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+
+#ifndef WSI_COMMON_DISPLAY_H
+#define WSI_COMMON_DISPLAY_H
+
+#include "wsi_common.h"
+#include <xf86drm.h>
+#include <xf86drmMode.h>
+
+#define typed_memcpy(dest, src, count) ({ \
+   STATIC_ASSERT(sizeof(*src) == sizeof(*dest)); \
+   memcpy((dest), (src), (count) * sizeof(*(src))); \
+})
+
+VkResult
+wsi_display_get_physical_device_display_properties(
+   VkPhysicalDevice physical_device,
+   struct wsi_device *wsi_device,
+   uint32_t *property_count,
+   VkDisplayPropertiesKHR *properties);
+
+VkResult
+wsi_display_get_physical_device_display_plane_properties(
+   VkPhysicalDevice physical_device,
+   struct wsi_device *wsi_device,
+   uint32_t *property_count,
+   VkDisplayPlanePropertiesKHR *properties);
+
+VkResult
+wsi_display_get_display_plane_supported_displays(
+   VkPhysicalDevice physical_device,
+   struct wsi_device *wsi_device,
+   uint32_t plane_index,
+   uint32_t *display_count,
+   VkDisplayKHR *displays);
+
+VkResult
+wsi_display_get_display_mode_properties(VkPhysicalDevice physical_device,
+                                        struct wsi_device *wsi_device,
+                                        VkDisplayKHR display,
+                                        uint32_t *property_count,
+                                        VkDisplayModePropertiesKHR *properties);
+
+VkResult
+wsi_display_create_display_mode(VkPhysicalDevice physical_device,
+                                struct wsi_device *wsi_device,
+                                VkDisplayKHR display,
+                                const VkDisplayModeCreateInfoKHR *create_info,
+                                const VkAllocationCallbacks *allocator,
+                                VkDisplayModeKHR *mode);
+
+VkResult
+wsi_get_display_plane_capabilities(VkPhysicalDevice physical_device,
+                                   struct wsi_device *wsi_device,
+                                   VkDisplayModeKHR mode_khr,
+                                   uint32_t plane_index,
+                                   VkDisplayPlaneCapabilitiesKHR *capabilities);
+
+VkResult
+wsi_create_display_surface(VkInstance instance,
+                           const VkAllocationCallbacks *pAllocator,
+                           const VkDisplaySurfaceCreateInfoKHR *pCreateInfo,
+                           VkSurfaceKHR *pSurface);
+
+#endif
diff --git a/src/vulkan/wsi/wsi_common_private.h b/src/vulkan/wsi/wsi_common_private.h
index 90941c8201b..3d502b9fc9d 100644
--- a/src/vulkan/wsi/wsi_common_private.h
+++ b/src/vulkan/wsi/wsi_common_private.h
@@ -141,6 +141,15 @@ void wsi_wl_finish_wsi(struct wsi_device *wsi_device,
                        const VkAllocationCallbacks *alloc);
 
 
+VkResult
+wsi_display_init_wsi(struct wsi_device *wsi_device,
+                     const VkAllocationCallbacks *alloc,
+                     int display_fd);
+
+void
+wsi_display_finish_wsi(struct wsi_device *wsi_device,
+                       const VkAllocationCallbacks *alloc);
+
 #define WSI_DEFINE_NONDISP_HANDLE_CASTS(__wsi_type, __VkType)              \
                                                                            \
    static inline struct __wsi_type *                                       \