From dce3adbc4cae486e2f3c080b995669d6db5ef58f Mon Sep 17 00:00:00 2001
From: Takoroka <137927095+Takoroka@users.noreply.github.com>
Date: Tue, 27 Oct 2026 17:04:06 -0400
Subject: Switch 2: window image sizes, queue semaphores, built-in fonts,
 memory budget

- gsv 1510 CalculateRequirements: block-linear size/alignment for window images.
- nvhost-gpu: Switch 2 channel event 7 is a real (unsignalled) event.
- Puller mirrors NVN2 queue semaphore releases into the page the CPU and GPU
  wait on (the first two-page nx2:gpu region); EDEN_NX2_METHOD_TRACE logs methods.
- pl:u 2000/2010 GetBuiltInFontSharedMemory/GetBuiltInFontData serve plain TTF
  copies of the shared fonts.
- Switch 2 processes count the alias region in their max memory, so the game's
  nninitStartup heap (total - 6.3 GiB) has room for its sound heap.
- gdbrsp.py: interrupt, threads, selthread, hits, continue_async, sleep.
---
 src/video_core/engines/puller.cpp | 20 ++++++++++++++++++++
 src/video_core/nx2.h              |  8 ++++++++
 2 files changed, 28 insertions(+)

(limited to 'src/video_core')

diff --git a/src/video_core/engines/puller.cpp b/src/video_core/engines/puller.cpp
index c9c1153bbf..9e78d586d1 100644
--- a/src/video_core/engines/puller.cpp
+++ b/src/video_core/engines/puller.cpp
@@ -110,6 +110,12 @@ void Puller::ProcessSemaphoreTriggerMethod(DmaPusher& dma_pusher) {
         const GPUVAddr sequence_address{regs.semaphore_address.SemaphoreAddress()};
         const u32 payload = regs.semaphore_sequence;
         dma_pusher.rasterizer->Query(sequence_address, VideoCommon::QueryType::Payload, VideoCommon::QueryPropertiesFlags::HasTimeout, payload, 0);
+        const u64 source_page = g_nx2_semaphore_source_page;
+        if (source_page != 0 && (sequence_address & ~GPUVAddr{0xFFF}) == source_page) {
+            const GPUVAddr mirror = g_nx2_semaphore_mirror_page + (sequence_address & 0xFFF);
+            LOG_DEBUG(HW_GPU, "Switch 2 semaphore {:#x}={:#x} mirrored to {:#x}", sequence_address, payload, mirror);
+            dma_pusher.rasterizer->Query(mirror, VideoCommon::QueryType::Payload, VideoCommon::QueryPropertiesFlags::HasTimeout, payload, 0);
+        }
     } else {
         do {
             const u32 word = dma_pusher.memory_manager.Read<u32>(regs.semaphore_address.SemaphoreAddress());
@@ -234,8 +240,18 @@ void Puller::CallPullerMethod(DmaPusher& dma_pusher, const MethodCall& method_ca
 }
 
 /// Calls a GPU engine method.
+static bool Nx2MethodTrace() {
+    static const bool trace = std::getenv("EDEN_NX2_METHOD_TRACE") != nullptr;
+    return trace;
+}
+
 void Puller::CallEngineMethod(DmaPusher& dma_pusher, const MethodCall& method_call) {
     const EngineID engine = bound_engines[method_call.subchannel];
+    if (Nx2MethodTrace()) {
+        LOG_INFO(HW_GPU, "nx2 method sub={} engine={:04X} method={:#x} arg={:#x}",
+                 method_call.subchannel, static_cast<u32>(engine), method_call.method,
+                 method_call.argument);
+    }
     switch (engine) {
     case EngineID::FERMI_TWOD_A:
         dma_pusher.channel_state.payload->fermi_2d.CallMethod(dma_pusher.system, method_call.method, method_call.argument, method_call.IsLastCall());
@@ -264,6 +280,10 @@ void Puller::CallEngineMethod(DmaPusher& dma_pusher, const MethodCall& method_ca
 /// Calls a GPU engine multivalue method.
 void Puller::CallEngineMultiMethod(DmaPusher& dma_pusher, u32 method, u32 subchannel, const u32* base_start, u32 amount, u32 methods_pending) {
     const EngineID engine = bound_engines[subchannel];
+    if (Nx2MethodTrace()) {
+        LOG_INFO(HW_GPU, "nx2 multimethod sub={} engine={:04X} method={:#x} amount={} first={:#x}",
+                 subchannel, static_cast<u32>(engine), method, amount, base_start[0]);
+    }
     switch (engine) {
     case EngineID::FERMI_TWOD_A:
         dma_pusher.channel_state.payload->fermi_2d.CallMultiMethod(dma_pusher.system, method, base_start, amount, methods_pending);
diff --git a/src/video_core/nx2.h b/src/video_core/nx2.h
index b8258ca243..9fdf0a7c68 100644
--- a/src/video_core/nx2.h
+++ b/src/video_core/nx2.h
@@ -5,10 +5,18 @@
 
 #include <atomic>
 
+#include "common/common_types.h"
+
 namespace Tegra {
 
 // Set once a Switch 2 (Ampere, NVN2) driver is talking to the GPU. Its command streams use
 // Ampere classes and the Turing+ macro ISA, which Eden's Maxwell engines don't implement.
 inline std::atomic<bool> g_nx2_ampere{false};
 
+// NVN2 queues release their progress values into one GPU page and wait (GPU acquires and CPU
+// polls) on the same offsets in the page below it. Something on the console copies one into
+// the other; until that is known, the puller mirrors releases that land in the source page.
+inline std::atomic<u64> g_nx2_semaphore_source_page{0}; // GPU VA of the released-to page
+inline std::atomic<u64> g_nx2_semaphore_mirror_page{0}; // GPU VA of the waited-on page
+
 } // namespace Tegra
-- 
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