hasvk: Gate video decode behind HASVK_DEBUG=video-decode.

Assisted-by: Claude

src/intel/vulkan_hasvk/anv_device.c

@@ -96,6 +96,13 @@ static const driOptionDescription anv_dri_options[] = {
 /* Render engine timestamp register */
 #define TIMESTAMP 0x2358
 
+static const struct debug_control debug_control[] = {
+   { "video-decode", ANV_DEBUG_VIDEO_DECODE },
+   { NULL, 0 }
+};
+
+enum anv_debug anv_debug;
+
 /* The "RAW" clocks on Linux are called "FAST" on FreeBSD */
 #if !defined(CLOCK_MONOTONIC_RAW) && defined(CLOCK_MONOTONIC_FAST)
 #define CLOCK_MONOTONIC_RAW CLOCK_MONOTONIC_FAST
@@ -198,7 +205,7 @@ get_device_extensions(const struct anv_physical_device *device,
    const bool has_syncobj_wait =
       (device->sync_syncobj_type.features & VK_SYNC_FEATURE_CPU_WAIT) != 0;
 
-   const bool video_decode = VIDEO_CODEC_H264DEC;
+   const bool video_decode = VIDEO_CODEC_H264DEC && ANV_DEBUG(VIDEO_DECODE);
 
    *ext = (struct vk_device_extension_table) {
       .KHR_8bit_storage                      = device->info.ver >= 8,
@@ -1582,7 +1589,7 @@ anv_physical_device_init_queue_families(struct anv_physical_device *pdevice)
             .engine_class = INTEL_ENGINE_CLASS_RENDER,
          };
       }
-      if (v_count > 0 && VIDEO_CODEC_H264DEC) {
+      if (v_count > 0 && VIDEO_CODEC_H264DEC && ANV_DEBUG(VIDEO_DECODE)) {
          pdevice->queue.families[family_count++] = (struct anv_queue_family) {
             .queueFlags = VK_QUEUE_VIDEO_DECODE_BIT_KHR,
             .queueCount = v_count,
@@ -2024,6 +2031,7 @@ VkResult anv_CreateInstance(
    anv_init_dri_options(instance);
 
    process_intel_debug_variable();
+   anv_debug = parse_debug_string(os_get_option("HASVK_DEBUG"), debug_control);
    instance->vk.enable_debug_logging = INTEL_DEBUG(DEBUG_PERF);
 
    intel_driver_ds_init();

src/intel/vulkan_hasvk/anv_formats.c

@@ -606,7 +606,7 @@ anv_get_image_format_features2(const struct intel_device_info *devinfo,
 
    if ((anv_format->flags & ANV_FORMAT_FLAG_CAN_VIDEO) &&
        (anv_format->n_planes > 1 || vk_tiling == VK_IMAGE_TILING_OPTIMAL)) {
-      flags |= VIDEO_CODEC_H264DEC ?
+      flags |= (VIDEO_CODEC_H264DEC && ANV_DEBUG(VIDEO_DECODE)) ?
                   VK_FORMAT_FEATURE_2_VIDEO_DECODE_OUTPUT_BIT_KHR |
                   VK_FORMAT_FEATURE_2_VIDEO_DECODE_DPB_BIT_KHR : 0;
    }

src/intel/vulkan_hasvk/anv_private.h

@@ -940,6 +940,15 @@ struct anv_instance {
     bool                                        no_16bit;
 };
 
+/* Parsed from the HASVK_DEBUG environment variable. */
+enum anv_debug {
+   ANV_DEBUG_VIDEO_DECODE               = BITFIELD_BIT(0),
+};
+
+extern enum anv_debug anv_debug;
+
+#define ANV_DEBUG(name) unlikely(anv_debug & ANV_DEBUG_##name)
+
 VkResult anv_init_wsi(struct anv_physical_device *physical_device);
 void anv_finish_wsi(struct anv_physical_device *physical_device);