From db58d0f40b8792427d1f416ec96726fb22837115 Mon Sep 17 00:00:00 2001
From: Juston Li <justonli@google.com>
Date: Tue, 30 Apr 2024 14:53:47 -0700
Subject: [PATCH] venus: forward nice priority when creating ring

Forward the nice priority to the renderer so that corresponding renderer
threads are created with the same priority.

For backwards compatibility, conditioned on
VK_MESA_VENUS_PROTOCOL_SPEC_VERSION >= 2

Signed-off-by: Juston Li <justonli@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29012>
---
 src/virtio/vulkan/vn_ring.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/virtio/vulkan/vn_ring.c b/src/virtio/vulkan/vn_ring.c
index a61aced81ed..9b5a293779b 100644
--- a/src/virtio/vulkan/vn_ring.c
+++ b/src/virtio/vulkan/vn_ring.c
@@ -5,6 +5,8 @@
 
 #include "vn_ring.h"
 
+#include <sys/resource.h>
+
 #include "venus-protocol/vn_protocol_driver_transport.h"
 
 #include "vn_cs.h"
@@ -318,8 +320,22 @@ vn_ring_create(struct vn_instance *instance,
    mtx_init(&ring->roundtrip_mutex, mtx_plain);
    ring->roundtrip_next = 1;
 
+   /* VkRingPriorityInfoMESA support requires
+    * VK_MESA_VENUS_PROTOCOL_SPEC_VERSION >= 2  */
+   int prio = 0;
+   bool ring_priority = false;
+   if (instance->renderer->info.vk_mesa_venus_protocol_spec_version >= 2) {
+      errno = 0;
+      prio = getpriority(PRIO_PROCESS, 0);
+      ring_priority = !(prio == -1 && errno);
+   }
+   const struct VkRingPriorityInfoMESA priority_info = {
+      .sType = VK_STRUCTURE_TYPE_RING_PRIORITY_INFO_MESA,
+      .priority = prio,
+   };
    const struct VkRingMonitorInfoMESA monitor_info = {
       .sType = VK_STRUCTURE_TYPE_RING_MONITOR_INFO_MESA,
+      .pNext = ring_priority ? &priority_info : NULL,
       .maxReportingPeriodMicroseconds = VN_WATCHDOG_REPORT_PERIOD_US,
    };
    const struct VkRingCreateInfoMESA info = {