Merge pull request #3440 from B3n30/file_read_delay

File_Sys: Add a size dependent delay for each file read

src/core/CMakeLists.txt

@@ -57,6 +57,7 @@ add_library(core STATIC
     file_sys/disk_archive.h
     file_sys/errors.h
     file_sys/file_backend.h
+    file_sys/delay_generator.h
     file_sys/ivfc_archive.cpp
     file_sys/ivfc_archive.h
     file_sys/ncch_container.cpp

src/core/file_sys/archive_extsavedata.cpp

@@ -27,7 +27,9 @@ namespace FileSys {
  */
 class FixSizeDiskFile : public DiskFile {
 public:
-    FixSizeDiskFile(FileUtil::IOFile&& file, const Mode& mode) : DiskFile(std::move(file), mode) {
+    FixSizeDiskFile(FileUtil::IOFile&& file, const Mode& mode,
+                    std::unique_ptr<DelayGenerator> delay_generator_)
+        : DiskFile(std::move(file), mode, std::move(delay_generator_)) {
         size = GetSize();
     }
 
@@ -53,6 +55,21 @@ private:
     u64 size{};
 };
 
+class ExtSaveDataDelayGenerator : public DelayGenerator {
+public:
+    u64 GetReadDelayNs(size_t length) override {
+        // This is the delay measured for a savedate read,
+        // not for extsaveData
+        // For now we will take that
+        static constexpr u64 slope(183);
+        static constexpr u64 offset(524879);
+        static constexpr u64 minimum(631826);
+        u64 ipc_delay_nanoseconds =
+            std::max<u64>(static_cast<u64>(length) * slope + offset, minimum);
+        return ipc_delay_nanoseconds;
+    }
+};
+
 /**
  * Archive backend for general extsave data archive type.
  * The behaviour of ExtSaveDataArchive is almost the same as SaveDataArchive, except for
@@ -118,7 +135,10 @@ public:
         Mode rwmode;
         rwmode.write_flag.Assign(1);
         rwmode.read_flag.Assign(1);
-        auto disk_file = std::make_unique<FixSizeDiskFile>(std::move(file), rwmode);
+        std::unique_ptr<DelayGenerator> delay_generator =
+            std::make_unique<ExtSaveDataDelayGenerator>();
+        auto disk_file =
+            std::make_unique<FixSizeDiskFile>(std::move(file), rwmode, std::move(delay_generator));
         return MakeResult<std::unique_ptr<FileBackend>>(std::move(disk_file));
     }
 

src/core/file_sys/archive_ncch.cpp

@@ -77,14 +77,17 @@ ResultVal<std::unique_ptr<FileBackend>> NCCHArchive::OpenFile(const Path& path,
         u64 romfs_size = 0;
 
         result = ncch_container.ReadRomFS(romfs_file, romfs_offset, romfs_size);
-        file = std::make_unique<IVFCFile>(std::move(romfs_file), romfs_offset, romfs_size);
+        std::unique_ptr<DelayGenerator> delay_generator = std::make_unique<RomFSDelayGenerator>();
+        file = std::make_unique<IVFCFile>(std::move(romfs_file), romfs_offset, romfs_size,
+                                          std::move(delay_generator));
     } else if (filepath_type == NCCHFilePathType::Code ||
                filepath_type == NCCHFilePathType::ExeFS) {
         std::vector<u8> buffer;
 
         // Load NCCH .code or icon/banner/logo
         result = ncch_container.LoadSectionExeFS(openfile_path.exefs_filepath.data(), buffer);
-        file = std::make_unique<NCCHFile>(std::move(buffer));
+        std::unique_ptr<DelayGenerator> delay_generator = std::make_unique<ExeFSDelayGenerator>();
+        file = std::make_unique<NCCHFile>(std::move(buffer), std::move(delay_generator));
     } else {
         LOG_ERROR(Service_FS, "Unknown NCCH archive type %u!", openfile_path.filepath_type);
         result = Loader::ResultStatus::Error;
@@ -194,7 +197,10 @@ u64 NCCHArchive::GetFreeBytes() const {
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-NCCHFile::NCCHFile(std::vector<u8> buffer) : file_buffer(std::move(buffer)) {}
+NCCHFile::NCCHFile(std::vector<u8> buffer, std::unique_ptr<DelayGenerator> delay_generator_)
+    : file_buffer(std::move(buffer)) {
+    delay_generator = std::move(delay_generator_);
+}
 
 ResultVal<size_t> NCCHFile::Read(const u64 offset, const size_t length, u8* buffer) const {
     LOG_TRACE(Service_FS, "called offset=%" PRIu64 ", length=%zu", offset, length);

src/core/file_sys/archive_ncch.h

@@ -17,7 +17,7 @@ namespace Service {
 namespace FS {
 enum class MediaType : u32;
 }
-}
+} // namespace Service
 
 namespace FileSys {
 
@@ -51,7 +51,7 @@ protected:
 // File backend for NCCH files
 class NCCHFile : public FileBackend {
 public:
-    explicit NCCHFile(std::vector<u8> buffer);
+    explicit NCCHFile(std::vector<u8> buffer, std::unique_ptr<DelayGenerator> delay_generator_);
 
     ResultVal<size_t> Read(u64 offset, size_t length, u8* buffer) const override;
     ResultVal<size_t> Write(u64 offset, size_t length, bool flush, const u8* buffer) override;

src/core/file_sys/archive_sdmc.cpp

@@ -17,6 +17,20 @@
 
 namespace FileSys {
 
+class SDMCDelayGenerator : public DelayGenerator {
+public:
+    u64 GetReadDelayNs(size_t length) override {
+        // This is the delay measured on O3DS and O2DS with
+        // https://gist.github.com/B3n30/ac40eac20603f519ff106107f4ac9182
+        // from the results the average of each length was taken.
+        static constexpr u64 slope(183);
+        static constexpr u64 offset(524879);
+        static constexpr u64 minimum(631826);
+        u64 IPCDelayNanoseconds = std::max<u64>(static_cast<u64>(length) * slope + offset, minimum);
+        return IPCDelayNanoseconds;
+    }
+};
+
 ResultVal<std::unique_ptr<FileBackend>> SDMCArchive::OpenFile(const Path& path,
                                                               const Mode& mode) const {
     Mode modified_mode;
@@ -82,7 +96,8 @@ ResultVal<std::unique_ptr<FileBackend>> SDMCArchive::OpenFileBase(const Path& pa
         return ERROR_NOT_FOUND;
     }
 
-    auto disk_file = std::make_unique<DiskFile>(std::move(file), mode);
+    std::unique_ptr<DelayGenerator> delay_generator = std::make_unique<SDMCDelayGenerator>();
+    auto disk_file = std::make_unique<DiskFile>(std::move(file), mode, std::move(delay_generator));
     return MakeResult<std::unique_ptr<FileBackend>>(std::move(disk_file));
 }
 
@@ -343,6 +358,7 @@ u64 SDMCArchive::GetFreeBytes() const {
 
 ArchiveFactory_SDMC::ArchiveFactory_SDMC(const std::string& sdmc_directory)
     : sdmc_directory(sdmc_directory) {
+
     LOG_DEBUG(Service_FS, "Directory %s set as SDMC.", sdmc_directory.c_str());
 }
 

src/core/file_sys/archive_selfncch.cpp

@@ -171,8 +171,11 @@ public:
 private:
     ResultVal<std::unique_ptr<FileBackend>> OpenRomFS() const {
         if (ncch_data.romfs_file) {
-            return MakeResult<std::unique_ptr<FileBackend>>(std::make_unique<IVFCFile>(
+            std::unique_ptr<DelayGenerator> delay_generator =
-                ncch_data.romfs_file, ncch_data.romfs_offset, ncch_data.romfs_size));
+                std::make_unique<RomFSDelayGenerator>();
+            return MakeResult<std::unique_ptr<FileBackend>>(
+                std::make_unique<IVFCFile>(ncch_data.romfs_file, ncch_data.romfs_offset,
+                                           ncch_data.romfs_size, std::move(delay_generator)));
         } else {
             LOG_INFO(Service_FS, "Unable to read RomFS");
             return ERROR_ROMFS_NOT_FOUND;
@@ -181,9 +184,11 @@ private:
 
     ResultVal<std::unique_ptr<FileBackend>> OpenUpdateRomFS() const {
         if (ncch_data.update_romfs_file) {
+            std::unique_ptr<DelayGenerator> delay_generator =
+                std::make_unique<RomFSDelayGenerator>();
             return MakeResult<std::unique_ptr<FileBackend>>(std::make_unique<IVFCFile>(
                 ncch_data.update_romfs_file, ncch_data.update_romfs_offset,
-                ncch_data.update_romfs_size));
+                ncch_data.update_romfs_size, std::move(delay_generator)));
         } else {
             LOG_INFO(Service_FS, "Unable to read update RomFS");
             return ERROR_ROMFS_NOT_FOUND;

src/core/file_sys/delay_generator.h

@@ -0,0 +1,29 @@
+// Copyright 2018 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+namespace FileSys {
+
+class DelayGenerator {
+public:
+    virtual u64 GetReadDelayNs(size_t length) = 0;
+
+    // TODO (B3N30): Add getter for all other file/directory io operations
+};
+
+class DefaultDelayGenerator : public DelayGenerator {
+public:
+    u64 GetReadDelayNs(size_t length) override {
+        // This is the delay measured for a romfs read.
+        // For now we will take that as a default
+        static constexpr u64 slope(94);
+        static constexpr u64 offset(582778);
+        static constexpr u64 minimum(663124);
+        u64 IPCDelayNanoseconds = std::max<u64>(static_cast<u64>(length) * slope + offset, minimum);
+        return IPCDelayNanoseconds;
+    }
+};
+
+} // namespace FileSys

src/core/file_sys/disk_archive.h

@@ -22,8 +22,10 @@ namespace FileSys {
 
 class DiskFile : public FileBackend {
 public:
-    DiskFile(FileUtil::IOFile&& file_, const Mode& mode_)
+    DiskFile(FileUtil::IOFile&& file_, const Mode& mode_,
+             std::unique_ptr<DelayGenerator> delay_generator_)
         : file(new FileUtil::IOFile(std::move(file_))) {
+        delay_generator = std::move(delay_generator_);
         mode.hex = mode_.hex;
     }
 

src/core/file_sys/file_backend.h

@@ -4,9 +4,12 @@
 
 #pragma once
 
+#include <algorithm>
 #include <cstddef>
+#include <memory>
 #include "common/common_types.h"
 #include "core/hle/result.h"
+#include "delay_generator.h"
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 // FileSys namespace
@@ -37,6 +40,20 @@ public:
      */
     virtual ResultVal<size_t> Write(u64 offset, size_t length, bool flush, const u8* buffer) = 0;
 
+    /**
+     * Get the amount of time a 3ds needs to read those data
+     * @param length Length in bytes of data read from file
+     * @return Nanoseconds for the delay
+     */
+    u64 GetReadDelayNs(size_t length) {
+        if (delay_generator != nullptr) {
+            return delay_generator->GetReadDelayNs(length);
+        }
+        LOG_ERROR(Service_FS, "Delay generator was not initalized. Using default");
+        delay_generator = std::make_unique<DefaultDelayGenerator>();
+        return delay_generator->GetReadDelayNs(length);
+    }
+
     /**
      * Get the size of the file in bytes
      * @return Size of the file in bytes
@@ -60,6 +77,9 @@ public:
      * Flushes the file
      */
     virtual void Flush() const = 0;
+
+protected:
+    std::unique_ptr<DelayGenerator> delay_generator;
 };
 
 } // namespace FileSys

src/core/file_sys/ivfc_archive.cpp

@@ -23,8 +23,9 @@ std::string IVFCArchive::GetName() const {
 
 ResultVal<std::unique_ptr<FileBackend>> IVFCArchive::OpenFile(const Path& path,
                                                               const Mode& mode) const {
+    std::unique_ptr<DelayGenerator> delay_generator = std::make_unique<IVFCDelayGenerator>();
     return MakeResult<std::unique_ptr<FileBackend>>(
-        std::make_unique<IVFCFile>(romfs_file, data_offset, data_size));
+        std::make_unique<IVFCFile>(romfs_file, data_offset, data_size, std::move(delay_generator)));
 }
 
 ResultCode IVFCArchive::DeleteFile(const Path& path) const {
@@ -89,8 +90,11 @@ u64 IVFCArchive::GetFreeBytes() const {
 
 ////////////////////////////////////////////////////////////////////////////////////////////////////
 
-IVFCFile::IVFCFile(std::shared_ptr<FileUtil::IOFile> file, u64 offset, u64 size)
+IVFCFile::IVFCFile(std::shared_ptr<FileUtil::IOFile> file, u64 offset, u64 size,
-    : romfs_file(std::move(file)), data_offset(offset), data_size(size) {}
+                   std::unique_ptr<DelayGenerator> delay_generator_)
+    : romfs_file(std::move(file)), data_offset(offset), data_size(size) {
+    delay_generator = std::move(delay_generator_);
+}
 
 ResultVal<size_t> IVFCFile::Read(const u64 offset, const size_t length, u8* buffer) const {
     LOG_TRACE(Service_FS, "called offset=%llu, length=%zu", offset, length);

src/core/file_sys/ivfc_archive.h

@@ -19,6 +19,46 @@
 
 namespace FileSys {
 
+class IVFCDelayGenerator : public DelayGenerator {
+    u64 GetReadDelayNs(size_t length) override {
+        // This is the delay measured for a romfs read.
+        // For now we will take that as a default
+        static constexpr u64 slope(94);
+        static constexpr u64 offset(582778);
+        static constexpr u64 minimum(663124);
+        u64 IPCDelayNanoseconds = std::max<u64>(static_cast<u64>(length) * slope + offset, minimum);
+        return IPCDelayNanoseconds;
+    }
+};
+
+class RomFSDelayGenerator : public DelayGenerator {
+public:
+    u64 GetReadDelayNs(size_t length) override {
+        // The delay was measured on O3DS and O2DS with
+        // https://gist.github.com/B3n30/ac40eac20603f519ff106107f4ac9182
+        // from the results the average of each length was taken.
+        static constexpr u64 slope(94);
+        static constexpr u64 offset(582778);
+        static constexpr u64 minimum(663124);
+        u64 IPCDelayNanoseconds = std::max<u64>(static_cast<u64>(length) * slope + offset, minimum);
+        return IPCDelayNanoseconds;
+    }
+};
+
+class ExeFSDelayGenerator : public DelayGenerator {
+public:
+    u64 GetReadDelayNs(size_t length) override {
+        // The delay was measured on O3DS and O2DS with
+        // https://gist.github.com/B3n30/ac40eac20603f519ff106107f4ac9182
+        // from the results the average of each length was taken.
+        static constexpr u64 slope(94);
+        static constexpr u64 offset(582778);
+        static constexpr u64 minimum(663124);
+        u64 IPCDelayNanoseconds = std::max<u64>(static_cast<u64>(length) * slope + offset, minimum);
+        return IPCDelayNanoseconds;
+    }
+};
+
 /**
  * Helper which implements an interface to deal with IVFC images used in some archives
  * This should be subclassed by concrete archive types, which will provide the
@@ -50,7 +90,8 @@ protected:
 
 class IVFCFile : public FileBackend {
 public:
-    IVFCFile(std::shared_ptr<FileUtil::IOFile> file, u64 offset, u64 size);
+    IVFCFile(std::shared_ptr<FileUtil::IOFile> file, u64 offset, u64 size,
+             std::unique_ptr<DelayGenerator> delay_generator_);
 
     ResultVal<size_t> Read(u64 offset, size_t length, u8* buffer) const override;
     ResultVal<size_t> Write(u64 offset, size_t length, bool flush, const u8* buffer) override;

src/core/file_sys/savedata_archive.cpp

@@ -13,6 +13,20 @@
 
 namespace FileSys {
 
+class SaveDataDelayGenerator : public DelayGenerator {
+public:
+    u64 GetReadDelayNs(size_t length) override {
+        // The delay was measured on O3DS and O2DS with
+        // https://gist.github.com/B3n30/ac40eac20603f519ff106107f4ac9182
+        // from the results the average of each length was taken.
+        static constexpr u64 slope(183);
+        static constexpr u64 offset(524879);
+        static constexpr u64 minimum(631826);
+        u64 IPCDelayNanoseconds = std::max<u64>(static_cast<u64>(length) * slope + offset, minimum);
+        return IPCDelayNanoseconds;
+    }
+};
+
 ResultVal<std::unique_ptr<FileBackend>> SaveDataArchive::OpenFile(const Path& path,
                                                                   const Mode& mode) const {
     LOG_DEBUG(Service_FS, "called path=%s mode=%01X", path.DebugStr().c_str(), mode.hex);
@@ -67,7 +81,8 @@ ResultVal<std::unique_ptr<FileBackend>> SaveDataArchive::OpenFile(const Path& pa
         return ERROR_FILE_NOT_FOUND;
     }
 
-    auto disk_file = std::make_unique<DiskFile>(std::move(file), mode);
+    std::unique_ptr<DelayGenerator> delay_generator = std::make_unique<SaveDataDelayGenerator>();
+    auto disk_file = std::make_unique<DiskFile>(std::move(file), mode, std::move(delay_generator));
     return MakeResult<std::unique_ptr<FileBackend>>(std::move(disk_file));
 }
 

src/core/hle/service/fs/archive.cpp

@@ -31,6 +31,7 @@
 #include "core/hle/ipc_helpers.h"
 #include "core/hle/kernel/client_port.h"
 #include "core/hle/kernel/client_session.h"
+#include "core/hle/kernel/event.h"
 #include "core/hle/kernel/handle_table.h"
 #include "core/hle/kernel/server_session.h"
 #include "core/hle/result.h"
@@ -104,6 +105,13 @@ void File::Read(Kernel::HLERequestContext& ctx) {
         rb.Push<u32>(*read);
     }
     rb.PushMappedBuffer(buffer);
+
+    std::chrono::nanoseconds read_timeout_ns{backend->GetReadDelayNs(length)};
+    ctx.SleepClientThread(Kernel::GetCurrentThread(), "file::read", read_timeout_ns,
+                          [](Kernel::SharedPtr<Kernel::Thread> thread,
+                             Kernel::HLERequestContext& ctx, ThreadWakeupReason reason) {
+                              // Nothing to do here
+                          });
 }
 
 void File::Write(Kernel::HLERequestContext& ctx) {