Mesa (main): zink: keep a count of async presents occuring for a given swapchain

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Module: Mesa
Branch: main
Commit: 1dfa19c541d2d1da1ba3f440d4d0107c4968b3e0
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=1dfa19c541d2d1da1ba3f440d4d0107c4968b3e0

Author: Mike Blumenkrantz <michael.blumenkrantz at gmail.com>
Date:   Thu Jun  9 09:19:18 2022 -0400

zink: keep a count of async presents occuring for a given swapchain

this provides info about whether a swapchain is in use in another thread

Fixes: 8ade5588e39 ("zink: add kopper api")

Reviewed-by: Adam Jackson <ajax at redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16932>

---

 src/gallium/drivers/zink/zink_kopper.c | 5 ++++-
 src/gallium/drivers/zink/zink_kopper.h | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/gallium/drivers/zink/zink_kopper.c b/src/gallium/drivers/zink/zink_kopper.c
index 3cdff02dab9..cfce107f1be 100644
--- a/src/gallium/drivers/zink/zink_kopper.c
+++ b/src/gallium/drivers/zink/zink_kopper.c
@@ -634,6 +634,8 @@ kopper_present(void *data, void *gdata, int thread_idx)
       _mesa_hash_table_insert(swapchain->presents, (void*)(uintptr_t)next, arr);
    }
    util_dynarray_append(arr, VkSemaphore, cpi->sem);
+   if (thread_idx != -1)
+      p_atomic_dec(&swapchain->async_presents);
    free(cpi);
 }
 
@@ -660,10 +662,11 @@ zink_kopper_present_queue(struct zink_screen *screen, struct zink_resource *res)
    cpi->info.pResults = NULL;
    res->obj->present = VK_NULL_HANDLE;
    if (util_queue_is_initialized(&screen->flush_queue)) {
+      p_atomic_inc(&cpi->swapchain->async_presents);
       util_queue_add_job(&screen->flush_queue, cpi, &cdt->present_fence,
                          kopper_present, NULL, 0);
    } else {
-      kopper_present(cpi, screen, 0);
+      kopper_present(cpi, screen, -1);
    }
    res->obj->acquire = VK_NULL_HANDLE;
    res->obj->indefinite_acquire = res->obj->acquired = false;
diff --git a/src/gallium/drivers/zink/zink_kopper.h b/src/gallium/drivers/zink/zink_kopper.h
index 01a3ccabaa1..836dac0c9a0 100644
--- a/src/gallium/drivers/zink/zink_kopper.h
+++ b/src/gallium/drivers/zink/zink_kopper.h
@@ -41,6 +41,7 @@ struct kopper_swapchain {
    VkSwapchainCreateInfoKHR scci;
    unsigned num_acquires;
    unsigned max_acquires;
+   unsigned async_presents;
 };
 
 enum kopper_type {