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vulkan/wsi/display: Don't re-probe connectors in between hotplugs.

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The state we return is a single plane per connector, and (effectively)
whether we're currently presenting on it.  We already know what connectors
we're presenting on, and there's no reason to re-probe for hotplugged
connectors here to learn that they're not active --
vkGetPhysicalDeviceDisplayProperties2KHR() is what you'd need to do to get
far more important information about the connector in the first place.

Running dEQP-VK.wsi.direct_drm.maintenance1.present\* on my CFL goes from
5.5s to 4.4s due to not re-probing EDID over and over.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/39466>
This commit is contained in:
Emma Anholt 2026-01-22 12:13:11 -08:00 • committed by Marge Bot
parent ab94515b0a
commit 08f0fd8bd6
1 changed files with 28 additions and 2 deletions
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30
src/vulkan/wsi/wsi_common_display.c
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@ -226,6 +226,10 @@ struct wsi_display {
pthread_t hotplug_thread;
struct list_head connectors; /* list of all discovered connectors */
/* Flag that we've called wsi_get_connectors() with the current fd.
*/
bool get_connectors_current;
mtx_t connectors_mutex;
/* A unique monotonically increasing value to associate with an individual
* colorimetry outcome on the output. This is used to avoid propagating
@ -893,13 +897,18 @@ wsi_get_connectors(VkPhysicalDevice physicalDevice)
struct wsi_display *wsi =
(struct wsi_display *) wsi_device->wsi[VK_ICD_WSI_PLATFORM_DISPLAY];
if (wsi->fd < 0)
mtx_lock(&wsi->connectors_mutex);
if (wsi->fd < 0 || wsi->get_connectors_current) {
mtx_unlock(&wsi->connectors_mutex);
return VK_SUCCESS;
}
drmModeResPtr mode_res = drmModeGetResources(wsi->fd);
if (!mode_res)
if (!mode_res) {
mtx_unlock(&wsi->connectors_mutex);
return VK_ERROR_OUT_OF_HOST_MEMORY;
}
/* Get current information */
for (int c = 0; c < mode_res->count_connectors; c++) {
@ -908,10 +917,14 @@ wsi_get_connectors(VkPhysicalDevice physicalDevice)
mode_res->connectors[c]);
if (!connector) {
drmModeFreeResources(mode_res);
mtx_unlock(&wsi->connectors_mutex);
return VK_ERROR_OUT_OF_HOST_MEMORY;
}
}
wsi->get_connectors_current = true;
mtx_unlock(&wsi->connectors_mutex);
drmModeFreeResources(mode_res);
return VK_SUCCESS;
}
@ -3509,6 +3522,9 @@ udev_event_listener_thread(void *data)
* and wsi_display_wait_for_event.
*/
mtx_lock(&wsi->wait_mutex);
mtx_lock(&wsi->connectors_mutex);
wsi->get_connectors_current = false;
mtx_unlock(&wsi->connectors_mutex);
u_cnd_monotonic_broadcast(&wsi->hotplug_cond);
list_for_each_entry(struct wsi_display_fence, fence,
&wsi_device->hotplug_fences, link) {
@ -3591,6 +3607,12 @@ wsi_display_init_wsi(struct wsi_device *wsi_device,
goto fail_mutex;
}
ret = mtx_init(&wsi->connectors_mutex, mtx_plain);
if (ret != thrd_success) {
result = VK_ERROR_OUT_OF_HOST_MEMORY;
goto fail_mutex2;
}
ret = u_cnd_monotonic_init(&wsi->wait_cond);
if (ret != thrd_success) {
result = VK_ERROR_OUT_OF_HOST_MEMORY;
@ -3618,6 +3640,8 @@ wsi_display_init_wsi(struct wsi_device *wsi_device,
fail_hotplug_cond:
u_cnd_monotonic_destroy(&wsi->wait_cond);
fail_cond:
mtx_destroy(&wsi->connectors_mutex);
fail_mutex2:
mtx_destroy(&wsi->wait_mutex);
fail_mutex:
vk_free(alloc, wsi);
@ -3643,6 +3667,7 @@ wsi_display_finish_wsi(struct wsi_device *wsi_device,
pthread_join(wsi->hotplug_thread, NULL);
}
mtx_destroy(&wsi->connectors_mutex);
mtx_destroy(&wsi->wait_mutex);
u_cnd_monotonic_destroy(&wsi->wait_cond);
u_cnd_monotonic_destroy(&wsi->hotplug_cond);
@ -3670,6 +3695,7 @@ wsi_ReleaseDisplayEXT(VkPhysicalDevice physicalDevice,
if (wsi->fd != wsi->device_fd)
close(wsi->fd);
wsi->fd = wsi->device_fd;
wsi->get_connectors_current = false;
}
struct wsi_display_connector *connector =