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File_Sys: Add a size dependend delay for each file read
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e51a642a13
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@ -56,6 +56,17 @@ public:
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return ERROR_UNSUPPORTED_OPEN_FLAGS;
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}
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u64 GetReadDelayNs(size_t length) const {
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// The delay was measured on O3DS and O2DS with
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// https://gist.github.com/B3n30/ac40eac20603f519ff106107f4ac9182
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// from the results the average of each length was taken.
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static constexpr u64 slope(94);
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static constexpr u64 offset(582778);
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static constexpr u64 minimum(663124);
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u64 IPCDelayNanoseconds = std::max<u64>(static_cast<u64>(length) * slope + offset, minimum);
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return IPCDelayNanoseconds;
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}
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u64 GetSize() const override {
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return data->size();
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}
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@ -36,6 +36,20 @@ ResultVal<size_t> DiskFile::Write(const u64 offset, const size_t length, const b
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return MakeResult<size_t>(written);
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}
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u64 DiskFile::GetReadDelayNs(size_t length) const {
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// TODO(B3N30): figure out the time a 3ds needs for those write
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// for that backend.
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// For now take the results from the romfs test.
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// The delay was measured on O3DS and O2DS with
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// https://gist.github.com/B3n30/ac40eac20603f519ff106107f4ac9182
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// from the results the average of each length was taken.
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static constexpr u64 slope(183);
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static constexpr u64 offset(524879);
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static constexpr u64 minimum(631826);
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u64 IPCDelayNanoseconds = std::max<u64>(static_cast<u64>(length) * slope + offset, minimum);
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return IPCDelayNanoseconds;
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}
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u64 DiskFile::GetSize() const {
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return file->GetSize();
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}
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@ -29,6 +29,7 @@ public:
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ResultVal<size_t> Read(u64 offset, size_t length, u8* buffer) const override;
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ResultVal<size_t> Write(u64 offset, size_t length, bool flush, const u8* buffer) override;
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u64 GetReadDelayNs(size_t length) const override;
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u64 GetSize() const override;
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bool SetSize(u64 size) const override;
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bool Close() const override;
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@ -4,6 +4,7 @@
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#pragma once
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#include <algorithm>
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#include <cstddef>
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#include "common/common_types.h"
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#include "core/hle/result.h"
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@ -37,6 +38,24 @@ public:
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*/
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virtual ResultVal<size_t> Write(u64 offset, size_t length, bool flush, const u8* buffer) = 0;
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/**
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* Get the amount of time a 3ds needs to read those data
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* @param length Length in bytes of data read from file
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* @return Nanoseconds for the delay
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*/
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virtual u64 GetReadDelayNs(size_t length) const {
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// Return the default delay for the case that the subclass backend didn't
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// implement one. We take the one measured for romfs reads
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// This should be removed as soon as every subclass backend
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// has one implemented
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LOG_WARNING(Service_FS, "Using default delay for read");
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static constexpr u64 slope(94);
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static constexpr u64 offset(582778);
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static constexpr u64 minimum(663124);
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u64 IPCDelayNanoseconds = std::max<u64>(static_cast<u64>(length) * slope + offset, minimum);
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return IPCDelayNanoseconds;
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}
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/**
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* Get the size of the file in bytes
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* @return Size of the file in bytes
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@ -107,6 +107,17 @@ ResultVal<size_t> IVFCFile::Write(const u64 offset, const size_t length, const b
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return MakeResult<size_t>(0);
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}
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u64 IVFCFile::GetReadDelayNs(size_t length) const {
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// The delay was measured on O3DS and O2DS with
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// https://gist.github.com/B3n30/ac40eac20603f519ff106107f4ac9182
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// from the results the average of each length was taken.
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static constexpr u64 slope(94);
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static constexpr u64 offset(582778);
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static constexpr u64 minimum(663124);
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u64 IPCDelayNanoseconds = std::max<u64>(static_cast<u64>(length) * slope + offset, minimum);
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return IPCDelayNanoseconds;
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}
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u64 IVFCFile::GetSize() const {
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return data_size;
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}
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@ -54,6 +54,7 @@ public:
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ResultVal<size_t> Read(u64 offset, size_t length, u8* buffer) const override;
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ResultVal<size_t> Write(u64 offset, size_t length, bool flush, const u8* buffer) override;
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u64 GetReadDelayNs(size_t length) const override;
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u64 GetSize() const override;
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bool SetSize(u64 size) const override;
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bool Close() const override {
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@ -31,6 +31,7 @@
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#include "core/hle/ipc_helpers.h"
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#include "core/hle/kernel/client_port.h"
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#include "core/hle/kernel/client_session.h"
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#include "core/hle/kernel/event.h"
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#include "core/hle/kernel/handle_table.h"
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#include "core/hle/kernel/server_session.h"
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#include "core/hle/result.h"
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@ -121,6 +122,13 @@ void File::Read(Kernel::HLERequestContext& ctx) {
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rb.Push<u32>(*read);
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}
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rb.PushMappedBuffer(buffer);
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u64 read_timeout_ns = backend->GetReadDelayNs(length);
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ctx.SleepClientThread(Kernel::GetCurrentThread(), "file::read", read_timeout_ns,
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[](Kernel::SharedPtr<Kernel::Thread> thread,
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Kernel::HLERequestContext& ctx, ThreadWakeupReason reason) {
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// Nothing to do here
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});
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}
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void File::Write(Kernel::HLERequestContext& ctx) {
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