/
vm.cpp
1368 lines (1118 loc) · 28.5 KB
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vm.cpp
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#include "stdafx.h"
#include "vm_locking.h"
#include "vm_ptr.h"
#include "vm_ref.h"
#include "vm_reservation.h"
#include "vm_var.h"
#include "Utilities/mutex.h"
#include "Utilities/cond.h"
#include "Utilities/Thread.h"
#include "Utilities/VirtualMemory.h"
#include "Utilities/address_range.h"
#include "Emu/CPU/CPUThread.h"
#include "Emu/Cell/lv2/sys_memory.h"
#include "Emu/RSX/GSRender.h"
#include <atomic>
#include <thread>
#include <deque>
LOG_CHANNEL(vm_log, "VM");
namespace vm
{
static u8* memory_reserve_4GiB(void* _addr, u64 size = 0x100000000)
{
for (u64 addr = reinterpret_cast<u64>(_addr) + 0x100000000;; addr += 0x100000000)
{
if (auto ptr = utils::memory_reserve(size, reinterpret_cast<void*>(addr)))
{
return static_cast<u8*>(ptr);
}
}
// TODO: a condition to break loop
return static_cast<u8*>(utils::memory_reserve(size));
}
// Emulated virtual memory
u8* const g_base_addr = memory_reserve_4GiB(reinterpret_cast<void*>(0x2'0000'0000));
// Unprotected virtual memory mirror
u8* const g_sudo_addr = memory_reserve_4GiB(g_base_addr);
// Auxiliary virtual memory for executable areas
u8* const g_exec_addr = memory_reserve_4GiB(g_sudo_addr, 0x200000000);
// Stats for debugging
u8* const g_stat_addr = memory_reserve_4GiB(g_exec_addr);
// Reservation stats
alignas(4096) u8 g_reservations[65536 / 128 * 64]{0};
// Shareable memory bits
alignas(4096) atomic_t<u8> g_shareable[65536]{0};
// Memory locations
std::vector<std::shared_ptr<block_t>> g_locations;
// Memory mutex core
shared_mutex g_mutex;
// Memory mutex acknowledgement
thread_local atomic_t<cpu_thread*>* g_tls_locked = nullptr;
// Currently locked cache lines
static union
{
atomic_t<u32> g_addr_locks[2];
atomic_t<u64> g_addr_lock;
};
// Memory mutex: passive locks
std::array<atomic_t<cpu_thread*>, g_cfg.core.ppu_threads.max> g_locks{};
std::array<atomic_t<u64>, 6> g_range_locks{};
// Page information
struct memory_page
{
// Memory flags
atomic_t<u8> flags;
};
// Memory pages
std::array<memory_page, 0x100000000 / 4096> g_pages{};
void reservation_update(u32 addr, u32 size, bool lsb)
{
u64 old = UINT64_MAX;
const auto cpu = get_current_cpu_thread();
while (true)
{
const auto [ok, rtime] = try_reservation_update(addr, size, lsb);
if (ok || old / 128 < rtime / 128)
{
return;
}
old = rtime;
if (cpu && cpu->test_stopped())
{
return;
}
}
}
static void _register_lock(cpu_thread* _cpu)
{
for (u32 i = 0, max = g_cfg.core.ppu_threads;;)
{
if (!g_locks[i] && g_locks[i].compare_and_swap_test(nullptr, _cpu))
{
g_tls_locked = g_locks.data() + i;
break;
}
if (++i == max) i = 0;
}
}
static atomic_t<u64>* _register_range_lock(const u64 lock_info)
{
while (true)
{
for (auto& lock : g_range_locks)
{
if (!lock && lock.compare_and_swap_test(0, lock_info))
{
return &lock;
}
}
}
}
static void _lock_shareable_cache(u8 /*value*/)
{
// Special value to block new range locks
g_addr_lock = -1;
// Wait for range locks to clear
for (auto& lock : g_range_locks)
{
while (const u64 _lock = lock.load())
{
_mm_pause();
}
}
}
void passive_lock(cpu_thread& cpu)
{
if (!g_tls_locked || *g_tls_locked != &cpu) [[unlikely]]
{
_register_lock(&cpu);
if (cpu.state) [[likely]]
{
cpu.state -= cpu_flag::wait + cpu_flag::memory;
}
if (g_mutex.is_free())
{
return;
}
cpu.state += cpu_flag::wait;
}
if (cpu.state & cpu_flag::wait)
{
while (true)
{
g_mutex.lock_unlock();
cpu.state -= cpu_flag::wait + cpu_flag::memory;
if (g_mutex.is_free()) [[likely]]
{
return;
}
cpu.state += cpu_flag::wait;
}
}
}
atomic_t<u64>* range_lock(u32 addr, u32 end)
{
static const auto test_addr = [](u64 target, u32 addr, u32 end) -> u64
{
if (target == umax)
{
return 0;
}
if (g_shareable[addr >> 16])
{
// Track shareable memory locks in 0x0..0xffff address range
addr &= 0xffff;
end = ((end - 1) & 0xffff) + 1;
}
const auto check_single = [](u32 t, u32 addr, u32 end)
{
if (!t)
{
return true;
}
if (g_shareable[t >> 16])
{
// Target within shareable memory range
t &= 0xffff;
}
if (addr > t || end <= t)
{
return true;
}
return false;
};
if (check_single(static_cast<u32>(target >> 32), addr, end) &&
check_single(static_cast<u32>(target), addr, end))
{
return u64{end} << 32 | addr;
}
return 0;
};
while (true)
{
if (u64 _a1 = test_addr(g_addr_lock.load(), addr, end)) [[likely]]
{
// Optimistic path (hope that address range is not locked)
const auto _ret = _register_range_lock(_a1);
if (_a1 == test_addr(g_addr_lock.load(), addr, end) && !!(g_pages[addr / 4096].flags & page_readable)) [[likely]]
{
return _ret;
}
_ret->release(0);
}
// Try tiggering a page fault (write)
// TODO: Read memory if needed
vm::_ref<atomic_t<u8>>(addr) += 0;
g_mutex.lock_unlock();
}
}
void passive_unlock(cpu_thread& cpu)
{
if (auto& ptr = g_tls_locked)
{
*ptr = nullptr;
ptr = nullptr;
if (cpu.state & cpu_flag::memory)
{
cpu.state -= cpu_flag::memory;
}
}
}
void cleanup_unlock(cpu_thread& cpu) noexcept
{
for (u32 i = 0, max = g_cfg.core.ppu_threads; i < max; i++)
{
if (g_locks[i] == &cpu)
{
g_locks[i].compare_and_swap_test(&cpu, nullptr);
return;
}
}
}
void temporary_unlock(cpu_thread& cpu) noexcept
{
if (!(cpu.state & cpu_flag::wait)) cpu.state += cpu_flag::wait;
if (g_tls_locked && g_tls_locked->compare_and_swap_test(&cpu, nullptr))
{
cpu.cpu_unmem();
}
}
void temporary_unlock() noexcept
{
if (auto cpu = get_current_cpu_thread())
{
temporary_unlock(*cpu);
}
}
reader_lock::reader_lock()
{
auto cpu = get_current_cpu_thread();
if (cpu)
{
if (!g_tls_locked || *g_tls_locked != cpu)
{
cpu = nullptr;
}
else
{
m_flags += flags_t::mem;
cpu->state += cpu_flag::wait;
}
}
g_mutex.lock_shared();
}
reader_lock::~reader_lock()
{
if (m_flags & flags_t::mem)
{
get_current_cpu_thread()->state -= cpu_flag::wait;
}
if (m_flags & flags_t::upgrade)
{
g_mutex.unlock();
}
else
{
g_mutex.unlock_shared();
}
}
void reader_lock::upgrade()
{
if (m_flags.test_and_set(flags_t::upgrade))
{
return;
}
g_mutex.lock_upgrade();
}
writer_lock::writer_lock(u32 addr /*mutable*/)
: addr(addr)
{
auto cpu = get_current_cpu_thread();
if (cpu)
{
if (!g_tls_locked || *g_tls_locked != cpu)
{
cpu = nullptr;
}
else
{
cpu->state += cpu_flag::wait;
}
}
if (addr >= 0x10000)
{
g_mutex.lock_shared(2);
for (auto lock = g_locks.cbegin(), end = lock + g_cfg.core.ppu_threads; lock != end; lock++)
{
if (auto ptr = +*lock; ptr && !(ptr->state & cpu_flag::memory))
{
ptr->state.test_and_set(cpu_flag::memory);
}
}
while (!g_addr_locks[g_addr_locks[0] ? 1 : 0].compare_and_swap_test(0, addr));
if (g_shareable[addr >> 16])
{
// Reservation address in shareable memory range
addr = addr & 0xffff;
}
for (auto& lock : g_range_locks)
{
while (true)
{
const u64 value = lock;
// Test beginning address
if (static_cast<u32>(value) > addr)
{
break;
}
// Test end address
if (static_cast<u32>(value >> 32) <= addr)
{
break;
}
_mm_pause();
}
}
for (auto lock = g_locks.cbegin(), end = lock + g_cfg.core.ppu_threads; lock != end; lock++)
{
if (auto ptr = +*lock)
{
while (!(ptr->state & cpu_flag::wait))
_mm_pause();
}
}
}
else
{
g_mutex.lock();
}
if (cpu)
{
cpu->state -= cpu_flag::memory + cpu_flag::wait;
}
}
writer_lock::~writer_lock()
{
if (addr >= 0x10000)
{
g_addr_locks[g_addr_locks[0] == addr ? 0 : 1].release(0);
// Always update reservation data (assume locked)
auto& res = reservation_acquire(addr, 128);
res.release((res | 127) + 1);
g_mutex.unlock_shared();
}
else
{
g_mutex.unlock();
}
}
u64 reservation_lock_internal(u32 addr, atomic_t<u64>& res, u64 lock_bits)
{
for (u64 i = 0;; i++)
{
if (u64 rtime = res; !(rtime & 127) && reservation_trylock(res, rtime, lock_bits).first) [[likely]]
{
return rtime;
}
if (auto cpu = get_current_cpu_thread(); cpu && cpu->state)
{
cpu->check_state();
}
else if (i < 15)
{
busy_wait(500);
}
else
{
// TODO: Accurate locking in this case
if (!(g_pages[addr / 4096].flags & page_writable))
{
return -1;
}
std::this_thread::yield();
}
}
}
static void _page_map(u32 addr, u8 flags, u32 size, utils::shm* shm)
{
if (!size || (size | addr) % 4096 || flags & page_allocated)
{
fmt::throw_exception("Invalid arguments (addr=0x%x, size=0x%x)" HERE, addr, size);
}
for (u32 i = addr / 4096; i < addr / 4096 + size / 4096; i++)
{
if (g_pages[i].flags)
{
fmt::throw_exception("Memory already mapped (addr=0x%x, size=0x%x, flags=0x%x, current_addr=0x%x)" HERE, addr, size, flags, i * 4096);
}
}
if (shm && shm->flags() != 0)
{
_lock_shareable_cache(1);
for (u32 i = addr / 65536; i < addr / 65536 + size / 65536; i++)
{
g_shareable[i] = 1;
}
// Unlock
g_addr_lock.release(0);
}
// Notify rsx that range has become valid
// Note: This must be done *before* memory gets mapped while holding the vm lock, otherwise
// the RSX might try to invalidate memory that got unmapped and remapped
if (const auto rsxthr = g_fxo->get<rsx::thread>())
{
rsxthr->on_notify_memory_mapped(addr, size);
}
if (!shm)
{
utils::memory_protect(g_base_addr + addr, size, utils::protection::rw);
}
else if (shm->map_critical(g_base_addr + addr) != g_base_addr + addr || shm->map_critical(g_sudo_addr + addr) != g_sudo_addr + addr)
{
fmt::throw_exception("Memory mapping failed - blame Windows (addr=0x%x, size=0x%x, flags=0x%x)", addr, size, flags);
}
if (flags & page_executable)
{
// TODO
utils::memory_commit(g_exec_addr + addr * 2, size * 2);
}
if (g_cfg.core.ppu_debug)
{
utils::memory_commit(g_stat_addr + addr, size);
}
for (u32 i = addr / 4096; i < addr / 4096 + size / 4096; i++)
{
if (g_pages[i].flags.exchange(flags | page_allocated))
{
fmt::throw_exception("Concurrent access (addr=0x%x, size=0x%x, flags=0x%x, current_addr=0x%x)" HERE, addr, size, flags, i * 4096);
}
}
}
bool page_protect(u32 addr, u32 size, u8 flags_test, u8 flags_set, u8 flags_clear)
{
vm::writer_lock lock(0);
if (!size || (size | addr) % 4096)
{
fmt::throw_exception("Invalid arguments (addr=0x%x, size=0x%x)" HERE, addr, size);
}
const u8 flags_both = flags_set & flags_clear;
flags_test |= page_allocated;
flags_set &= ~flags_both;
flags_clear &= ~flags_both;
for (u32 i = addr / 4096; i < addr / 4096 + size / 4096; i++)
{
if ((g_pages[i].flags & flags_test) != (flags_test | page_allocated))
{
return false;
}
}
if (!flags_set && !flags_clear)
{
return true;
}
u8 start_value = 0xff;
for (u32 start = addr / 4096, end = start + size / 4096, i = start; i < end + 1; i++)
{
u8 new_val = 0xff;
if (i < end)
{
new_val = g_pages[i].flags;
new_val |= flags_set;
new_val &= ~flags_clear;
g_pages[i].flags.release(new_val);
new_val &= (page_readable | page_writable);
}
if (new_val != start_value)
{
if (u32 page_size = (i - start) * 4096)
{
const auto protection = start_value & page_writable ? utils::protection::rw : (start_value & page_readable ? utils::protection::ro : utils::protection::no);
utils::memory_protect(g_base_addr + start * 4096, page_size, protection);
}
start_value = new_val;
start = i;
}
}
return true;
}
static u32 _page_unmap(u32 addr, u32 max_size, utils::shm* shm)
{
if (!max_size || (max_size | addr) % 4096)
{
fmt::throw_exception("Invalid arguments (addr=0x%x, max_size=0x%x)" HERE, addr, max_size);
}
// Determine deallocation size
u32 size = 0;
bool is_exec = false;
for (u32 i = addr / 4096; i < addr / 4096 + max_size / 4096; i++)
{
if ((g_pages[i].flags & page_allocated) == 0)
{
break;
}
if (size == 0)
{
is_exec = !!(g_pages[i].flags & page_executable);
}
else
{
// Must be consistent
verify(HERE), is_exec == !!(g_pages[i].flags & page_executable);
}
size += 4096;
}
for (u32 i = addr / 4096; i < addr / 4096 + size / 4096; i++)
{
if (!(g_pages[i].flags.exchange(0) & page_allocated))
{
fmt::throw_exception("Concurrent access (addr=0x%x, size=0x%x, current_addr=0x%x)" HERE, addr, size, i * 4096);
}
}
if (g_shareable[addr >> 16])
{
_lock_shareable_cache(0);
for (u32 i = addr / 65536; i < addr / 65536 + size / 65536; i++)
{
g_shareable[i] = 0;
}
// Unlock
g_addr_lock.release(0);
}
// Notify rsx to invalidate range
// Note: This must be done *before* memory gets unmapped while holding the vm lock, otherwise
// the RSX might try to call VirtualProtect on memory that is already unmapped
if (const auto rsxthr = g_fxo->get<rsx::thread>())
{
rsxthr->on_notify_memory_unmapped(addr, size);
}
// Actually unmap memory
if (!shm)
{
utils::memory_protect(g_base_addr + addr, size, utils::protection::no);
std::memset(g_sudo_addr + addr, 0, size);
}
else
{
shm->unmap_critical(g_base_addr + addr);
shm->unmap_critical(g_sudo_addr + addr);
}
if (is_exec)
{
utils::memory_decommit(g_exec_addr + addr * 2, size * 2);
}
if (g_cfg.core.ppu_debug)
{
utils::memory_decommit(g_stat_addr + addr, size);
}
return size;
}
bool check_addr(u32 addr, u32 size, u8 flags)
{
// Overflow checking
if (addr + size < addr && (addr + size) != 0)
{
return false;
}
// Always check this flag
flags |= page_allocated;
for (u32 i = addr / 4096, max = (addr + size - 1) / 4096; i <= max; i++)
{
if ((g_pages[i].flags & flags) != flags) [[unlikely]]
{
return false;
}
}
return true;
}
u32 alloc(u32 size, memory_location_t location, u32 align)
{
const auto block = get(location);
if (!block)
{
fmt::throw_exception("Invalid memory location (%u)" HERE, +location);
}
return block->alloc(size, align);
}
u32 falloc(u32 addr, u32 size, memory_location_t location)
{
const auto block = get(location, addr);
if (!block)
{
fmt::throw_exception("Invalid memory location (%u, addr=0x%x)" HERE, +location, addr);
}
return block->falloc(addr, size);
}
u32 dealloc(u32 addr, memory_location_t location)
{
const auto block = get(location, addr);
if (!block)
{
fmt::throw_exception("Invalid memory location (%u, addr=0x%x)" HERE, +location, addr);
}
return block->dealloc(addr);
}
void dealloc_verbose_nothrow(u32 addr, memory_location_t location) noexcept
{
const auto block = get(location, addr);
if (!block)
{
vm_log.error("vm::dealloc(): invalid memory location (%u, addr=0x%x)\n", +location, addr);
return;
}
if (!block->dealloc(addr))
{
vm_log.error("vm::dealloc(): deallocation failed (addr=0x%x)\n", addr);
return;
}
}
bool block_t::try_alloc(u32 addr, u8 flags, u32 size, std::shared_ptr<utils::shm>&& shm)
{
// Check if memory area is already mapped
for (u32 i = addr / 4096; i <= (addr + size - 1) / 4096; i++)
{
if (g_pages[i].flags)
{
return false;
}
}
const u32 page_addr = addr + (this->flags & 0x10 ? 0x1000 : 0);
const u32 page_size = size - (this->flags & 0x10 ? 0x2000 : 0);
if (this->flags & 0x10)
{
// Mark overflow/underflow guard pages as allocated
verify(HERE), !g_pages[addr / 4096].flags.exchange(page_allocated);
verify(HERE), !g_pages[addr / 4096 + size / 4096 - 1].flags.exchange(page_allocated);
}
// Map "real" memory pages
_page_map(page_addr, flags, page_size, shm.get());
// Add entry
m_map[addr] = std::make_pair(size, std::move(shm));
return true;
}
block_t::block_t(u32 addr, u32 size, u64 flags)
: addr(addr)
, size(size)
, flags(flags)
{
if (flags & 0x100)
{
// Special path for 4k-aligned pages
m_common = std::make_shared<utils::shm>(size);
verify(HERE), m_common->map_critical(vm::base(addr), utils::protection::no) == vm::base(addr);
verify(HERE), m_common->map_critical(vm::get_super_ptr(addr)) == vm::get_super_ptr(addr);
}
}
block_t::~block_t()
{
{
vm::writer_lock lock(0);
// Deallocate all memory
for (auto it = m_map.begin(), end = m_map.end(); !m_common && it != end;)
{
const auto next = std::next(it);
const auto size = it->second.first;
_page_unmap(it->first, size, it->second.second.get());
it = next;
}
// Special path for 4k-aligned pages
if (m_common)
{
m_common->unmap_critical(vm::base(addr));
m_common->unmap_critical(vm::get_super_ptr(addr));
}
}
}
u32 block_t::alloc(const u32 orig_size, u32 align, const std::shared_ptr<utils::shm>* src, u64 flags)
{
if (!src)
{
// Use the block's flags
flags = this->flags;
}
vm::writer_lock lock(0);
// Determine minimal alignment
const u32 min_page_size = flags & 0x100 ? 0x1000 : 0x10000;
// Align to minimal page size
const u32 size = ::align(orig_size, min_page_size) + (flags & 0x10 ? 0x2000 : 0);
// Check alignment (it's page allocation, so passing small values there is just silly)
if (align < min_page_size || align != (0x80000000u >> std::countl_zero(align)))
{
fmt::throw_exception("Invalid alignment (size=0x%x, align=0x%x)" HERE, size, align);
}
// Return if size is invalid
if (!orig_size || !size || orig_size > size || size > this->size)
{
return 0;
}
u8 pflags = page_readable | page_writable;
if ((flags & SYS_MEMORY_PAGE_SIZE_64K) == SYS_MEMORY_PAGE_SIZE_64K)
{
pflags |= page_64k_size;
}
else if (!(flags & (SYS_MEMORY_PAGE_SIZE_MASK & ~SYS_MEMORY_PAGE_SIZE_1M)))
{
pflags |= page_1m_size;
}
// Create or import shared memory object
std::shared_ptr<utils::shm> shm;
if (m_common)
verify(HERE), !src;
else if (src)
shm = *src;
else
shm = std::make_shared<utils::shm>(size);
// Search for an appropriate place (unoptimized)
for (u32 addr = ::align(this->addr, align); u64{addr} + size <= u64{this->addr} + this->size; addr += align)
{
if (try_alloc(addr, pflags, size, std::move(shm)))
{
return addr + (flags & 0x10 ? 0x1000 : 0);
}
}
return 0;
}
u32 block_t::falloc(u32 addr, const u32 orig_size, const std::shared_ptr<utils::shm>* src, u64 flags)
{
if (!src)
{
// Use the block's flags
flags = this->flags;
}
vm::writer_lock lock(0);
// Determine minimal alignment
const u32 min_page_size = flags & 0x100 ? 0x1000 : 0x10000;
// Align to minimal page size
const u32 size = ::align(orig_size, min_page_size);
// return if addr or size is invalid
if (!size || addr < this->addr || orig_size > size || addr + u64{size} > this->addr + u64{this->size} || flags & 0x10)
{
return 0;
}
u8 pflags = page_readable | page_writable;
if ((flags & SYS_MEMORY_PAGE_SIZE_64K) == SYS_MEMORY_PAGE_SIZE_64K)
{
pflags |= page_64k_size;
}
else if (!(flags & (SYS_MEMORY_PAGE_SIZE_MASK & ~SYS_MEMORY_PAGE_SIZE_1M)))
{
pflags |= page_1m_size;
}
// Create or import shared memory object
std::shared_ptr<utils::shm> shm;
if (m_common)
verify(HERE), !src;
else if (src)
shm = *src;
else
shm = std::make_shared<utils::shm>(size);
if (!try_alloc(addr, pflags, size, std::move(shm)))
{
return 0;
}
return addr;
}
u32 block_t::dealloc(u32 addr, const std::shared_ptr<utils::shm>* src)
{
{
vm::writer_lock lock(0);
const auto found = m_map.find(addr - (flags & 0x10 ? 0x1000 : 0));
if (found == m_map.end())
{
return 0;
}
if (src && found->second.second.get() != src->get())
{
return 0;
}
// Get allocation size
const auto size = found->second.first - (flags & 0x10 ? 0x2000 : 0);
if (flags & 0x10)
{
// Clear guard pages
verify(HERE), g_pages[addr / 4096 - 1].flags.exchange(0) == page_allocated;
verify(HERE), g_pages[addr / 4096 + size / 4096].flags.exchange(0) == page_allocated;
}
// Unmap "real" memory pages
verify(HERE), size == _page_unmap(addr, size, found->second.second.get());
// Remove entry
m_map.erase(found);
return size;
}
}
std::pair<u32, std::shared_ptr<utils::shm>> block_t::get(u32 addr, u32 size)
{
if (addr < this->addr || addr + u64{size} > this->addr + u64{this->size})
{
return {addr, nullptr};
}
vm::reader_lock lock;
const auto upper = m_map.upper_bound(addr);
if (upper == m_map.begin())
{
return {addr, nullptr};
}
const auto found = std::prev(upper);
// Exact address condition (size == 0)
if (size == 0 && found->first != addr)
{
return {addr, nullptr};
}
// Special path
if (m_common)
{