From dc5396a4668b564b2d1f4488d10581dd67fc22db Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Sat, 7 Nov 2020 00:08:19 -0800
Subject: video_core: dma_pusher: Remove integrity check on command lists.

- This seems to cause softlocks in Breath of the Wild.
---
 src/core/hle/service/nvdrv/devices/nvhost_gpu.cpp |  1 -
 src/video_core/dma_pusher.cpp                     | 26 +----------------------
 src/video_core/dma_pusher.h                       |  3 ---
 3 files changed, 1 insertion(+), 29 deletions(-)

diff --git a/src/core/hle/service/nvdrv/devices/nvhost_gpu.cpp b/src/core/hle/service/nvdrv/devices/nvhost_gpu.cpp
index 152019548..b1d9d55b5 100644
--- a/src/core/hle/service/nvdrv/devices/nvhost_gpu.cpp
+++ b/src/core/hle/service/nvdrv/devices/nvhost_gpu.cpp
@@ -214,7 +214,6 @@ u32 nvhost_gpu::SubmitGPFIFOImpl(IoctlSubmitGpfifo& params, std::vector<u8>& out
         params.fence_out.value = syncpoint_manager.GetSyncpointMax(params.fence_out.id);
     }
 
-    entries.RefreshIntegrityChecks(gpu);
     gpu.PushGPUEntries(std::move(entries));
 
     if (params.flags.add_increment.Value()) {
diff --git a/src/video_core/dma_pusher.cpp b/src/video_core/dma_pusher.cpp
index 105b85a92..d8801b1f5 100644
--- a/src/video_core/dma_pusher.cpp
+++ b/src/video_core/dma_pusher.cpp
@@ -13,20 +13,6 @@
 
 namespace Tegra {
 
-void CommandList::RefreshIntegrityChecks(GPU& gpu) {
-    command_list_hashes.resize(command_lists.size());
-
-    for (std::size_t index = 0; index < command_lists.size(); ++index) {
-        const CommandListHeader command_list_header = command_lists[index];
-        std::vector<CommandHeader> command_headers(command_list_header.size);
-        gpu.MemoryManager().ReadBlockUnsafe(command_list_header.addr, command_headers.data(),
-                                            command_list_header.size * sizeof(u32));
-        command_list_hashes[index] =
-            Common::CityHash64(reinterpret_cast<char*>(command_headers.data()),
-                               command_list_header.size * sizeof(u32));
-    }
-}
-
 DmaPusher::DmaPusher(Core::System& system, GPU& gpu) : gpu{gpu}, system{system} {}
 
 DmaPusher::~DmaPusher() = default;
@@ -77,8 +63,7 @@ bool DmaPusher::Step() {
         dma_pushbuffer.pop();
     } else {
         const CommandListHeader command_list_header{
-            command_list.command_lists[dma_pushbuffer_subindex]};
-        const u64 next_hash = command_list.command_list_hashes[dma_pushbuffer_subindex++];
+            command_list.command_lists[dma_pushbuffer_subindex++]};
         const GPUVAddr dma_get = command_list_header.addr;
 
         if (dma_pushbuffer_subindex >= command_list.command_lists.size()) {
@@ -95,15 +80,6 @@ bool DmaPusher::Step() {
         command_headers.resize(command_list_header.size);
         gpu.MemoryManager().ReadBlockUnsafe(dma_get, command_headers.data(),
                                             command_list_header.size * sizeof(u32));
-
-        // Integrity check
-        const u64 new_hash = Common::CityHash64(reinterpret_cast<char*>(command_headers.data()),
-                                                command_list_header.size * sizeof(u32));
-        if (new_hash != next_hash) {
-            LOG_CRITICAL(HW_GPU, "CommandList at addr=0x{:X} is corrupt, skipping!", dma_get);
-            dma_pushbuffer.pop();
-            return true;
-        }
     }
     for (std::size_t index = 0; index < command_headers.size();) {
         const CommandHeader& command_header = command_headers[index];
diff --git a/src/video_core/dma_pusher.h b/src/video_core/dma_pusher.h
index 9d9a750d9..96ac267f7 100644
--- a/src/video_core/dma_pusher.h
+++ b/src/video_core/dma_pusher.h
@@ -90,10 +90,7 @@ struct CommandList final {
     explicit CommandList(std::vector<Tegra::CommandHeader>&& prefetch_command_list)
         : prefetch_command_list{std::move(prefetch_command_list)} {}
 
-    void RefreshIntegrityChecks(GPU& gpu);
-
     std::vector<Tegra::CommandListHeader> command_lists;
-    std::vector<u64> command_list_hashes;
     std::vector<Tegra::CommandHeader> prefetch_command_list;
 };
 
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