1 files changed, 213 insertions, 3 deletions

diff --git a/src/video_core/buffer_cache/buffer_cache.h b/src/video_core/buffer_cache/buffer_cache.h
index a3358048dc..cd176dec27 100644
--- a/src/video_core/buffer_cache/buffer_cache.h
+++ b/src/video_core/buffer_cache/buffer_cache.h
@@ -17,6 +17,7 @@
 #include "video_core/buffer_cache/buffer_cache_base.h"
 #include "video_core/guest_memory.h"
 #include "video_core/host1x/gpu_device_memory_manager.h"
+#include "video_core/nx2.h"
 #include "video_core/nx2_profile.h"
 #include "video_core/texture_cache/util.h"
 
@@ -100,6 +101,12 @@ void BufferCache<P>::TickFrame() {
         return;
     }
     runtime.TickFrame(slot_buffers);
+    if (frame_tick % 600 == 0 && !uploaded_buffer_ranges.empty()) {
+        for (const auto& [address, size] : uploaded_buffer_ranges) {
+            device_memory.HintCold(address, size);
+        }
+        uploaded_buffer_ranges.clear();
+    }
     if (static u64 frames{}; ++frames % 600 == 0) {
         u64 total{};
         size_t count{};
@@ -141,9 +148,10 @@ void BufferCache<P>::TickFrame() {
         // title 1's buffers were ~200 MiB of an 8 GB GPU's ~6.8 GB in use, yet this collector
         // ran aggressively every frame on the device-wide figure, evicting up to 64 buffers (and
         // downloading the GPU-written ones, ~5% of the GPU thread) that were recreated later.
-        // Collect when the buffers themselves are large.
-        if (buffer_bytes >= 1_GiB) {
-            RunGarbageCollector(buffer_bytes >= 2_GiB);
+        // Collect when the buffers themselves are large. At 1 GiB it held geometry of scenes
+        // long gone: title 1's title screen grew to ~0.9 GB of buffers in ten minutes.
+        if (buffer_bytes >= 512_MiB) {
+            RunGarbageCollector(buffer_bytes >= 1_GiB);
         }
     } else if (total_used_memory >= minimum_memory) {
         RunGarbageCollector(total_used_memory >= critical_memory);
@@ -166,6 +174,7 @@ void BufferCache<P>::UnmapGPUMemory(size_t as_id, GPUVAddr gpu_addr, size_t size
 
 template <class P>
 void BufferCache<P>::WriteMemory(DAddr device_addr, u64 size) {
+    Nx2NoteListHostWrite(device_addr, size);
     if (IsRegionGpuModified(device_addr, size)) {
         ClearDownload(device_addr, size);
         gpu_modified_ranges.Subtract(device_addr, size);
@@ -186,6 +195,7 @@ void BufferCache<P>::CachedWriteMemory(DAddr device_addr, u64 size) {
         return;
     }
 
+    Nx2NoteListHostWrite(device_addr, size);
     tmp_buffer.resize_destructive(size);
     device_memory.ReadBlockUnsafe(device_addr, tmp_buffer.data(), size);
 
@@ -291,6 +301,10 @@ bool BufferCache<P>::DMACopy(GPUVAddr src_address, GPUVAddr dest_address, u64 am
     const bool has_new_downloads = tmp_intervals.size() != 0;
     for (const auto& pair : tmp_intervals) {
         gpu_modified_ranges.Add(pair.first, pair.second);
+        if (Tegra::g_nx2_ampere.load(std::memory_order_relaxed)) {
+            Tegra::Nx2MarkGpuWritten(pair.first, pair.second);
+            Nx2NoteListWrite(buffer_b, pair.first, pair.second);
+        }
     }
     const auto& copy = copies[0];
     src_buffer.MarkUsage(copy.src_offset, copy.size);
@@ -1647,6 +1661,197 @@ void BufferCache<P>::MarkWrittenBuffer(BufferId buffer_id, DAddr device_addr, u3
     } else {
         ArmReadTraps(device_addr, size);
     }
+    if (Tegra::g_nx2_ampere.load(std::memory_order_relaxed)) {
+        Tegra::Nx2MarkGpuWritten(device_addr, size);
+        Nx2NoteListWrite(buffer_id, device_addr, size);
+    }
+}
+
+template <class P>
+void BufferCache<P>::Nx2NoteListWrite(BufferId buffer_id, DAddr device_addr, u64 size) {
+    if constexpr (!IS_OPENGL) {
+        if (size == 0 || !Tegra::g_nx2_has_command_list_pages.load(std::memory_order_relaxed)) {
+            return;
+        }
+        constexpr u64 page_bits = Tegra::Nx2WrittenPageBits;
+        const u64 last = (std::min<u64>)((device_addr + size - 1) >> page_bits,
+                                         Tegra::g_nx2_command_list_pages.size() * 64 - 1);
+        for (u64 page = device_addr >> page_bits; page <= last;) {
+            // Storage buffers can be large: skip 64 pages at a time where none is a list page.
+            const u64 word =
+                Tegra::g_nx2_command_list_pages[page / 64].load(std::memory_order_relaxed) >>
+                (page % 64);
+            if (word == 0) {
+                page = (page / 64 + 1) * 64;
+                continue;
+            }
+            if (word & 1) {
+                const DAddr page_addr = page << page_bits;
+                {
+                    std::scoped_lock lock{nx2_list_mutex};
+                    Nx2ListPage& entry = nx2_list_pages[page_addr];
+                    ++entry.writes;
+                    if (!nx2_collect_list_copies && !entry.draw_written) {
+                        entry.draw_written = true;
+                        LOG_INFO(HW_GPU, "Command list page {:#x} is written by draws too: its "
+                                         "lists drain the split",
+                                 page_addr);
+                    }
+                }
+                if (nx2_collect_list_copies) {
+                    nx2_list_copy_requests.emplace_back(buffer_id, page_addr);
+                }
+            }
+            ++page;
+        }
+    }
+}
+
+template <class P>
+bool BufferCache<P>::Nx2CopyListPages(u64 tick) {
+    if constexpr (IS_OPENGL) {
+        return false;
+    } else {
+        if (nx2_list_copy_requests.empty()) {
+            return false;
+        }
+        std::ranges::sort(nx2_list_copy_requests, {}, &std::pair<BufferId, DAddr>::second);
+        constexpr DAddr page_size = DAddr{1} << Tegra::Nx2WrittenPageBits;
+        bool recorded = false;
+        for (size_t i = 0; i < nx2_list_copy_requests.size(); ++i) {
+            const auto [buffer_id, page] = nx2_list_copy_requests[i];
+            if (i + 1 < nx2_list_copy_requests.size() &&
+                nx2_list_copy_requests[i + 1].second == page) {
+                continue;
+            }
+            Buffer& buffer = slot_buffers[buffer_id];
+            const DAddr begin = (std::max<DAddr>)(page, buffer.CpuAddr());
+            const DAddr end =
+                (std::min<DAddr>)(page + page_size, buffer.CpuAddr() + buffer.SizeBytes());
+            if (begin >= end) {
+                continue;
+            }
+            Nx2Staging staging = runtime.DownloadStagingBuffer(page_size, true);
+            const BufferCopy copy{
+                .src_offset = buffer.Offset(begin),
+                .dst_offset = staging.offset + (begin - page),
+                .size = end - begin,
+            };
+            buffer.MarkUsage(copy.src_offset, copy.size);
+            runtime.CopyBuffer(staging.buffer, buffer, std::span{&copy, 1}, true);
+            recorded = true;
+            std::scoped_lock lock{nx2_list_mutex};
+            Nx2ListPage& entry = nx2_list_pages[page];
+            if (entry.copy) {
+                nx2_retired_list_copies.emplace_back(entry.copy_tick, std::move(*entry.copy));
+            }
+            entry.copy = staging;
+            entry.copy_writes = entry.writes;
+            entry.copy_tick = tick;
+            entry.copy_begin = static_cast<u32>(begin - page);
+            entry.copy_end = static_cast<u32>(end - page);
+        }
+        nx2_list_copy_requests.clear();
+        std::erase_if(nx2_retired_list_copies, [this](auto& retired) {
+            if (!runtime.IsFree(retired.first)) {
+                return false;
+            }
+            runtime.FreeDeferredStagingBuffer(retired.second);
+            return true;
+        });
+        return recorded;
+    }
+}
+
+template <class P>
+auto BufferCache<P>::Nx2ReadListCopy(DAddr device_addr, std::span<u8> out) -> Nx2ListRead {
+    if constexpr (IS_OPENGL) {
+        return Nx2ListRead::Unknown;
+    } else {
+        constexpr DAddr page_size = DAddr{1} << Tegra::Nx2WrittenPageBits;
+        const DAddr page = device_addr & ~(page_size - 1);
+        const u64 offset = device_addr - page;
+        if (offset + out.size() > page_size) {
+            return Nx2ListRead::Unknown;
+        }
+        const auto current = [&](const Nx2ListPage& entry) {
+            return entry.copy && !entry.draw_written && entry.copy_writes == entry.writes &&
+                   offset >= entry.copy_begin && offset + out.size() <= entry.copy_end;
+        };
+        u64 tick{};
+        u64 writes{};
+        {
+            std::scoped_lock lock{nx2_list_mutex};
+            const auto it = nx2_list_pages.find(page);
+            if (it == nx2_list_pages.end()) {
+                return Nx2ListRead::Unknown;
+            }
+            const Nx2ListPage& entry = it->second;
+            // Pages the CPU writes the lists of (GPU-written once, long before) stay synced.
+            if (!entry.draw_written && entry.synced_writes == entry.writes) {
+                return Nx2ListRead::Synced;
+            }
+            if (!current(entry)) {
+                return Nx2ListRead::Unknown;
+            }
+            // The lists after the first of a batch find the copy done: read it at once.
+            if (runtime.IsFree(entry.copy_tick)) {
+                std::memcpy(out.data(), entry.copy->mapped_span.data() + offset, out.size());
+                return Nx2ListRead::Copied;
+            }
+            tick = entry.copy_tick;
+            writes = entry.copy_writes;
+        }
+        // Submitted with the work that wrote the page (Nx2CopyListPages's caller flushes).
+        runtime.WaitSubmittedTick(tick);
+        std::scoped_lock lock{nx2_list_mutex};
+        const auto it = nx2_list_pages.find(page);
+        if (it == nx2_list_pages.end() || !current(it->second) || it->second.copy_tick != tick ||
+            it->second.copy_writes != writes) {
+            return Nx2ListRead::Unknown;
+        }
+        std::memcpy(out.data(), it->second.copy->mapped_span.data() + offset, out.size());
+        return Nx2ListRead::Copied;
+    }
+}
+
+template <class P>
+void BufferCache<P>::Nx2NoteListSynced(DAddr page) {
+    if constexpr (!IS_OPENGL) {
+        std::scoped_lock lock{nx2_list_mutex};
+        Nx2ListPage& entry = nx2_list_pages[page];
+        entry.synced_writes = entry.writes;
+    }
+}
+
+template <class P>
+void BufferCache<P>::Nx2NoteListHostWrite(DAddr device_addr, u64 size) {
+    if constexpr (!IS_OPENGL) {
+        if (size == 0 || !Tegra::g_nx2_has_command_list_pages.load(std::memory_order_relaxed)) {
+            return;
+        }
+        constexpr u64 page_bits = Tegra::Nx2WrittenPageBits;
+        const u64 last = (std::min<u64>)((device_addr + size - 1) >> page_bits,
+                                         Tegra::g_nx2_command_list_pages.size() * 64 - 1);
+        for (u64 page = device_addr >> page_bits; page <= last; ++page) {
+            if (!((Tegra::g_nx2_command_list_pages[page / 64].load(std::memory_order_relaxed) >>
+                   (page % 64)) &
+                  1)) {
+                continue;
+            }
+            std::scoped_lock lock{nx2_list_mutex};
+            const auto it = nx2_list_pages.find(page << page_bits);
+            if (it == nx2_list_pages.end()) {
+                continue;
+            }
+            Nx2ListPage& entry = it->second;
+            const bool synced = entry.synced_writes == entry.writes;
+            ++entry.writes;
+            if (synced) {
+                entry.synced_writes = entry.writes;
+            }
+        }
+    }
 }
 
 template <class P>
@@ -1964,6 +2169,11 @@ void BufferCache<P>::MappedUploadMemory([[maybe_unused]] Buffer& buffer,
             u8* const src_pointer = staging_pointer.data() + copy.src_offset;
             const DAddr device_addr = buffer.CpuAddr() + copy.dst_offset;
             device_memory.ReadBlockUnsafe(device_addr, src_pointer, copy.size);
+            // Large uploads are mostly geometry the host GPU now has its own copy of: TickFrame
+            // marks their guest memory cold (see TextureCache::RefreshContents).
+            if (copy.size >= 256_KiB) {
+                uploaded_buffer_ranges.emplace_back(device_addr, copy.size);
+            }
             // Apply the staging offset
             copy.src_offset += upload_staging.offset;
         }