host_memory: Switch to FreeRegionManager

This commit is contained in:
Liam 2023-11-17 20:57:39 +02:00 committed by t895
parent 448d4815de
commit 4766baddf3
2 changed files with 67 additions and 29 deletions

View File

@ -32,6 +32,7 @@
#include "common/alignment.h" #include "common/alignment.h"
#include "common/assert.h" #include "common/assert.h"
#include "common/free_region_manager.h"
#include "common/host_memory.h" #include "common/host_memory.h"
#include "common/logging/log.h" #include "common/logging/log.h"
@ -339,6 +340,11 @@ private:
return false; return false;
} }
void EnableDirectMappedAddress() {
// TODO
UNREACHABLE();
}
HANDLE process{}; ///< Current process handle HANDLE process{}; ///< Current process handle
HANDLE backing_handle{}; ///< File based backing memory HANDLE backing_handle{}; ///< File based backing memory
@ -472,7 +478,7 @@ public:
} }
} }
#else #else
virtual_base = static_cast<u8*>(ChooseVirtualBase(virtual_size)); virtual_base = virtual_map_base = static_cast<u8*>(ChooseVirtualBase(virtual_size));
if (virtual_base == MAP_FAILED) { if (virtual_base == MAP_FAILED) {
LOG_CRITICAL(HW_Memory, "mmap failed: {}", strerror(errno)); LOG_CRITICAL(HW_Memory, "mmap failed: {}", strerror(errno));
throw std::bad_alloc{}; throw std::bad_alloc{};
@ -480,7 +486,7 @@ public:
madvise(virtual_base, virtual_size, MADV_HUGEPAGE); madvise(virtual_base, virtual_size, MADV_HUGEPAGE);
#endif #endif
placeholders.add({0, virtual_size}); free_manager.SetAddressSpace(virtual_base, virtual_size);
good = true; good = true;
} }
@ -489,10 +495,11 @@ public:
} }
void Map(size_t virtual_offset, size_t host_offset, size_t length) { void Map(size_t virtual_offset, size_t host_offset, size_t length) {
{ // Intersect the range with our address space.
std::scoped_lock lock{placeholder_mutex}; AdjustMap(&virtual_offset, &length);
placeholders.subtract({virtual_offset, virtual_offset + length});
} // We are removing a placeholder.
free_manager.AllocateBlock(virtual_base + virtual_offset, length);
void* ret = mmap(virtual_base + virtual_offset, length, PROT_READ | PROT_WRITE, void* ret = mmap(virtual_base + virtual_offset, length, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_FIXED, fd, host_offset); MAP_SHARED | MAP_FIXED, fd, host_offset);
@ -503,26 +510,23 @@ public:
// The method name is wrong. We're still talking about the virtual range. // The method name is wrong. We're still talking about the virtual range.
// We don't want to unmap, we want to reserve this memory. // We don't want to unmap, we want to reserve this memory.
{ // Intersect the range with our address space.
std::scoped_lock lock{placeholder_mutex}; AdjustMap(&virtual_offset, &length);
auto it = placeholders.find({virtual_offset - 1, virtual_offset + length + 1});
if (it != placeholders.end()) { // Merge with any adjacent placeholder mappings.
size_t prev_upper = virtual_offset + length; auto [merged_pointer, merged_size] =
virtual_offset = std::min(virtual_offset, it->lower()); free_manager.FreeBlock(virtual_base + virtual_offset, length);
length = std::max(it->upper(), prev_upper) - virtual_offset;
}
placeholders.add({virtual_offset, virtual_offset + length}); void* ret = mmap(merged_pointer, merged_size, PROT_NONE,
}
void* ret = mmap(virtual_base + virtual_offset, length, PROT_NONE,
MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0); MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, -1, 0);
ASSERT_MSG(ret != MAP_FAILED, "mmap failed: {}", strerror(errno)); ASSERT_MSG(ret != MAP_FAILED, "mmap failed: {}", strerror(errno));
} }
void Protect(size_t virtual_offset, size_t length, bool read, bool write) { void Protect(size_t virtual_offset, size_t length, bool read, bool write) {
int flags = 0; // Intersect the range with our address space.
AdjustMap(&virtual_offset, &length);
int flags = PROT_NONE;
if (read) { if (read) {
flags |= PROT_READ; flags |= PROT_READ;
} }
@ -533,17 +537,22 @@ public:
ASSERT_MSG(ret == 0, "mprotect failed: {}", strerror(errno)); ASSERT_MSG(ret == 0, "mprotect failed: {}", strerror(errno));
} }
void EnableDirectMappedAddress() {
virtual_base = nullptr;
}
const size_t backing_size; ///< Size of the backing memory in bytes const size_t backing_size; ///< Size of the backing memory in bytes
const size_t virtual_size; ///< Size of the virtual address placeholder in bytes const size_t virtual_size; ///< Size of the virtual address placeholder in bytes
u8* backing_base{reinterpret_cast<u8*>(MAP_FAILED)}; u8* backing_base{reinterpret_cast<u8*>(MAP_FAILED)};
u8* virtual_base{reinterpret_cast<u8*>(MAP_FAILED)}; u8* virtual_base{reinterpret_cast<u8*>(MAP_FAILED)};
u8* virtual_map_base{reinterpret_cast<u8*>(MAP_FAILED)};
private: private:
/// Release all resources in the object /// Release all resources in the object
void Release() { void Release() {
if (virtual_base != MAP_FAILED) { if (virtual_map_base != MAP_FAILED) {
int ret = munmap(virtual_base, virtual_size); int ret = munmap(virtual_map_base, virtual_size);
ASSERT_MSG(ret == 0, "munmap failed: {}", strerror(errno)); ASSERT_MSG(ret == 0, "munmap failed: {}", strerror(errno));
} }
@ -558,10 +567,29 @@ private:
} }
} }
int fd{-1}; // memfd file descriptor, -1 is the error value of memfd_create void AdjustMap(size_t* virtual_offset, size_t* length) {
if (virtual_base != nullptr) {
return;
}
boost::icl::interval_set<size_t> placeholders; ///< Mapped placeholders // If we are direct mapped, we want to make sure we are operating on a region
std::mutex placeholder_mutex; ///< Mutex for placeholders // that is in range of our virtual mapping.
size_t intended_start = *virtual_offset;
size_t intended_end = intended_start + *length;
size_t address_space_start = reinterpret_cast<size_t>(virtual_map_base);
size_t address_space_end = address_space_start + virtual_size;
if (address_space_start > intended_end || intended_start > address_space_end) {
*virtual_offset = 0;
*length = 0;
} else {
*virtual_offset = std::max(intended_start, address_space_start);
*length = std::min(intended_end, address_space_end) - *virtual_offset;
}
}
int fd{-1}; // memfd file descriptor, -1 is the error value of memfd_create
FreeRegionManager free_manager{};
}; };
#else // ^^^ Linux ^^^ vvv Generic vvv #else // ^^^ Linux ^^^ vvv Generic vvv
@ -591,15 +619,16 @@ HostMemory::HostMemory(size_t backing_size_, size_t virtual_size_)
try { try {
// Try to allocate a fastmem arena. // Try to allocate a fastmem arena.
// The implementation will fail with std::bad_alloc on errors. // The implementation will fail with std::bad_alloc on errors.
impl = std::make_unique<HostMemory::Impl>(AlignUp(backing_size, PageAlignment), impl =
AlignUp(virtual_size, PageAlignment) + std::make_unique<HostMemory::Impl>(AlignUp(backing_size, PageAlignment),
3 * HugePageSize); AlignUp(virtual_size, PageAlignment) + HugePageSize);
backing_base = impl->backing_base; backing_base = impl->backing_base;
virtual_base = impl->virtual_base; virtual_base = impl->virtual_base;
if (virtual_base) { if (virtual_base) {
virtual_base += 2 * HugePageSize - 1; // Ensure the virtual base is aligned to the L2 block size.
virtual_base -= reinterpret_cast<size_t>(virtual_base) & (HugePageSize - 1); virtual_base = reinterpret_cast<u8*>(
Common::AlignUp(reinterpret_cast<uintptr_t>(virtual_base), HugePageSize));
virtual_base_offset = virtual_base - impl->virtual_base; virtual_base_offset = virtual_base - impl->virtual_base;
} }
@ -650,4 +679,11 @@ void HostMemory::Protect(size_t virtual_offset, size_t length, bool read, bool w
impl->Protect(virtual_offset + virtual_base_offset, length, read, write); impl->Protect(virtual_offset + virtual_base_offset, length, read, write);
} }
void HostMemory::EnableDirectMappedAddress() {
if (impl) {
impl->EnableDirectMappedAddress();
virtual_size += reinterpret_cast<uintptr_t>(virtual_base);
}
}
} // namespace Common } // namespace Common

View File

@ -37,6 +37,8 @@ public:
void Protect(size_t virtual_offset, size_t length, bool read, bool write); void Protect(size_t virtual_offset, size_t length, bool read, bool write);
void EnableDirectMappedAddress();
[[nodiscard]] u8* BackingBasePointer() noexcept { [[nodiscard]] u8* BackingBasePointer() noexcept {
return backing_base; return backing_base;
} }