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sf/cmif: optimize dispatch table walk to use binary search over linear search

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This commit is contained in:
Michael Scire 2021-12-06 13:13:46 -08:00
parent 1019bc54e6
commit 09c6aa29dd
3 changed files with 110 additions and 22 deletions
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20
libraries/libstratosphere/include/stratosphere/sf/cmif/sf_cmif_service_dispatch.hpp
View file

@ -53,16 +53,32 @@ namespace ams::sf::cmif {
u32 cmd_id;
Result (*handler)(CmifOutHeader **out_header_ptr, ServiceDispatchContext &ctx, const cmif::PointerAndSize &in_raw_data);
constexpr inline bool Matches(u32 cmd_id, hos::Version hosver) const {
constexpr inline bool MatchesVersion(hos::Version hosver) const {
const bool min_valid = this->hosver_low == hos::Version_Min;
const bool max_valid = this->hosver_high == hos::Version_Max;
return this->cmd_id == cmd_id && (min_valid || this->hosver_low <= hosver) && (max_valid || hosver <= this->hosver_high);
return (min_valid || this->hosver_low <= hosver) && (max_valid || hosver <= this->hosver_high);
}
constexpr inline bool Matches(u32 cmd_id, hos::Version hosver) const {
return this->cmd_id == cmd_id && this->MatchesVersion(hosver);
}
constexpr inline decltype(handler) GetHandler() const {
return this->handler;
}
constexpr inline bool operator>(const ServiceCommandMeta &rhs) const {
if (this->cmd_id > rhs.cmd_id) {
return true;
} else if (this->cmd_id == rhs.cmd_id && this->hosver_low > rhs.hosver_low) {
return true;
} else if (this->cmd_id == rhs.cmd_id && this->hosver_low == rhs.hosver_low && this->hosver_high == rhs.hosver_high){
return true;
} else {
return false;
}
}
};
static_assert(util::is_pod<ServiceCommandMeta>::value && sizeof(ServiceCommandMeta) == 0x18, "sizeof(ServiceCommandMeta)");

37
libraries/libstratosphere/include/stratosphere/sf/impl/sf_impl_autogen_interface_macros.hpp
View file

@ -85,16 +85,41 @@ namespace ams::sf::impl {
constexpr const auto &BaseEntries = ::ams::sf::cmif::ServiceDispatchTraits<BASECLASS>::DispatchTable.GetEntries(); \
constexpr size_t BaseSize = BaseEntries.size(); \
\
std::array<::ams::sf::cmif::ServiceCommandMeta, BaseSize + CurSize> combined_entries{}; \
for (size_t i = 0; i < BaseSize; ++i) { \
combined_entries[i] = BaseEntries[i]; \
constexpr size_t CombinedSize = BaseSize + CurSize; \
\
std::array<size_t, CombinedSize> map{}; \
for (size_t i = 0; i < CombinedSize; ++i) { map[i] = i; } \
\
for (size_t i = 1; i < CombinedSize; ++i) { \
size_t j = i; \
while (j > 0) { \
const auto li = map[j]; \
const auto ri = map[j - 1]; \
\
const auto &lhs = (li < BaseSize) ? BaseEntries[li] : cur_entries[li - BaseSize]; \
const auto &rhs = (ri < BaseSize) ? BaseEntries[ri] : cur_entries[ri - BaseSize]; \
\
if (!(rhs > lhs)) { \
break; \
} \
\
std::swap(map[j], map[j - 1]); \
\
--j; \
} \
} \
for (size_t i = 0; i < CurSize; ++i) { \
combined_entries[BaseSize + i] = cur_entries[i]; \
\
std::array<::ams::sf::cmif::ServiceCommandMeta, CombinedSize> combined_entries{}; \
for (size_t i = 0; i < CombinedSize; ++i) { \
if (map[i] < BaseSize) { \
combined_entries[i] = BaseEntries[map[i]]; \
} else { \
combined_entries[i] = cur_entries[map[i] - BaseSize]; \
} \
} \
\
return ::ams::sf::cmif::ServiceDispatchTable { combined_entries }; \
} () \
}() \
}; \
};

75
libraries/libstratosphere/source/sf/cmif/sf_cmif_service_dispatch.cpp
View file

@ -17,6 +17,65 @@
namespace ams::sf::cmif {
namespace {
ALWAYS_INLINE decltype(ServiceCommandMeta::handler) FindCommandHandlerByBinarySearch(const ServiceCommandMeta *entries, const size_t entry_count, const u32 cmd_id, const hos::Version hos_version) {
/* Binary search for the handler. */
ssize_t lo = 0;
ssize_t hi = entry_count - 1;
while (lo <= hi) {
const size_t mid = (lo + hi) / 2;
if (entries[mid].cmd_id < cmd_id) {
lo = mid + 1;
} else if (entries[mid].cmd_id > cmd_id) {
hi = mid - 1;
} else {
/* Find start. */
size_t start = mid;
while (start > 0 && entries[start - 1].cmd_id == cmd_id) {
--start;
}
/* Find end. */
size_t end = mid + 1;
while (end < entry_count && entries[end].cmd_id == cmd_id) {
++end;
}
for (size_t idx = start; idx < end; ++idx) {
if (entries[idx].MatchesVersion(hos_version)) {
return entries[idx].GetHandler();
}
}
break;
}
}
return nullptr;
}
ALWAYS_INLINE decltype(ServiceCommandMeta::handler) FindCommandHandlerByLinearSearch(const ServiceCommandMeta *entries, const size_t entry_count, const u32 cmd_id, const hos::Version hos_version) {
for (size_t i = 0; i < entry_count; ++i) {
if (entries[i].Matches(cmd_id, hos_version)) {
return entries[i].GetHandler();
break;
}
}
return nullptr;
}
ALWAYS_INLINE decltype(ServiceCommandMeta::handler) FindCommandHandler(const ServiceCommandMeta *entries, const size_t entry_count, const u32 cmd_id, const hos::Version hos_version) {
if (entry_count >= 8) {
return FindCommandHandlerByBinarySearch(entries, entry_count, cmd_id, hos_version);
} else {
return FindCommandHandlerByLinearSearch(entries, entry_count, cmd_id, hos_version);
}
}
}
Result impl::ServiceDispatchTableBase::ProcessMessageImpl(ServiceDispatchContext &ctx, const cmif::PointerAndSize &in_raw_data, const ServiceCommandMeta *entries, const size_t entry_count) const {
/* Get versioning info. */
const auto hos_version = hos::GetVersion();
@ -30,13 +89,7 @@ namespace ams::sf::cmif {
const u32 cmd_id = in_header->command_id;
/* Find a handler. */
decltype(ServiceCommandMeta::handler) cmd_handler = nullptr;
for (size_t i = 0; i < entry_count; i++) {
if (entries[i].Matches(cmd_id, hos_version)) {
cmd_handler = entries[i].GetHandler();
break;
}
}
const auto cmd_handler = FindCommandHandler(entries, entry_count, cmd_id, hos_version);
R_UNLESS(cmd_handler != nullptr, sf::cmif::ResultUnknownCommandId());
/* Invoke handler. */
@ -73,13 +126,7 @@ namespace ams::sf::cmif {
const u32 cmd_id = in_header->command_id;
/* Find a handler. */
decltype(ServiceCommandMeta::handler) cmd_handler = nullptr;
for (size_t i = 0; i < entry_count; i++) {
if (entries[i].Matches(cmd_id, hos_version)) {
cmd_handler = entries[i].GetHandler();
break;
}
}
const auto cmd_handler = FindCommandHandler(entries, entry_count, cmd_id, hos_version);
/* If we didn't find a handler, forward the request. */
if (cmd_handler == nullptr) {