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SMMU: Implement backing CPU page protect/unprotect

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This commit is contained in:
Fernando Sahmkow 2023-12-24 21:49:54 +01:00 committed by Liam
parent 7a9d1ad2f8
commit c85d7ccd79
4 changed files with 141 additions and 6 deletions
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51
src/core/device_memory_manager.h
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@ -5,6 +5,8 @@
#include <deque>
#include <memory>
#include <array>
#include <atomic>
#include "common/common_types.h"
#include "common/virtual_buffer.h"
@ -23,6 +25,7 @@ struct DeviceMemoryManagerAllocator;
template <typename Traits>
class DeviceMemoryManager {
using DeviceInterface = typename Traits::DeviceInterface;
using DeviceMethods = Traits::DeviceMethods;
public:
DeviceMemoryManager(const DeviceMemory& device_memory);
@ -35,7 +38,7 @@ public:
DAddr AllocatePinned(size_t size);
void Free(DAddr start, size_t size);
void Map(DAddr address, VAddr virtual_address, size_t size, size_t p_id);
void Map(DAddr address, VAddr virtual_address, size_t size, size_t process_id);
void Unmap(DAddr address, size_t size);
// Write / Read
@ -57,6 +60,8 @@ public:
size_t RegisterProcess(Memory::Memory* memory);
void UnregisterProcess(size_t id);
void UpdatePagesCachedCount(DAddr addr, size_t size, s32 delta);
private:
static constexpr bool supports_pinning = Traits::supports_pinning;
static constexpr size_t device_virtual_bits = Traits::device_virtual_bits;
@ -90,8 +95,52 @@ private:
Common::VirtualBuffer<u32> compressed_physical_ptr;
Common::VirtualBuffer<u32> compressed_device_addr;
// Process memory interfaces
std::deque<size_t> id_pool;
std::deque<Memory::Memory*> registered_processes;
// Memory protection management
static constexpr size_t guest_max_as_bits = 39;
static constexpr size_t guest_as_size = 1ULL << guest_max_as_bits;
static constexpr size_t guest_mask = guest_as_size - 1ULL;
static constexpr size_t process_id_start_bit = guest_max_as_bits;
std::pair<size_t, VAddr> ExtractCPUBacking(size_t page_index) {
auto content = cpu_backing_address[page_index];
const VAddr address = content & guest_mask;
const size_t process_id = static_cast<size_t>(content >> process_id_start_bit);
return std::make_pair(process_id, address);
}
void InsertCPUBacking(size_t page_index, VAddr address, size_t process_id) {
cpu_backing_address[page_index] = address | (process_id << page_index);
}
Common::VirtualBuffer<VAddr> cpu_backing_address;
static constexpr size_t subentries = 4;
static constexpr size_t subentries_mask = subentries - 1;
class CounterEntry final {
public:
CounterEntry() = default;
std::atomic_uint16_t& Count(std::size_t page) {
return values[page & subentries_mask];
}
const std::atomic_uint16_t& Count(std::size_t page) const {
return values[page & subentries_mask];
}
private:
std::array<std::atomic_uint16_t, subentries> values{};
};
static_assert(sizeof(CounterEntry) == subentries * sizeof(u16), "CounterEntry should be 8 bytes!");
static constexpr size_t num_counter_entries = (1ULL << (device_virtual_bits - page_bits)) / subentries;
using CachedPages = std::array<CounterEntry, num_counter_entries>;
std::unique_ptr<CachedPages> cached_pages;
};
} // namespace Core

82
src/core/device_memory_manager.inc
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@ -2,12 +2,15 @@
// SPDX-License-Identifier: GPL-2.0-or-later
#include <atomic>
#include <limits>
#include <memory>
#include <type_traits>
#include "common/address_space.h"
#include "common/address_space.inc"
#include "common/alignment.h"
#include "common/assert.h"
#include "common/div_ceil.h"
#include "common/scope_exit.h"
#include "core/device_memory.h"
#include "core/device_memory_manager.h"
@ -51,7 +54,11 @@ struct DeviceMemoryManagerAllocator {
}
DAddr AllocatePinned(size_t size) {
return pin_allocator.Allocate(size);
if constexpr (supports_pinning) {
return pin_allocator.Allocate(size);
} else {
return DAddr{};
}
}
void DoInRange(DAddr address, size_t size, auto pin_func, auto main_func) {
@ -100,6 +107,7 @@ DeviceMemoryManager<Traits>::DeviceMemoryManager(const DeviceMemory& device_memo
interface{nullptr}, compressed_physical_ptr(device_as_size >> Memory::YUZU_PAGEBITS),
compressed_device_addr(1ULL << (physical_max_bits - Memory::YUZU_PAGEBITS)) {
impl = std::make_unique<DeviceMemoryManagerAllocator<Traits>>();
cached_pages = std::make_unique<CachedPages>();
}
template <typename Traits>
@ -132,14 +140,14 @@ void DeviceMemoryManager<Traits>::Free(DAddr start, size_t size) {
template <typename Traits>
void DeviceMemoryManager<Traits>::Map(DAddr address, VAddr virtual_address, size_t size,
size_t p_id) {
Core::Memory::Memory* process_memory = registered_processes[p_id];
size_t process_id) {
Core::Memory::Memory* process_memory = registered_processes[process_id];
size_t start_page_d = address >> Memory::YUZU_PAGEBITS;
size_t num_pages = Common::AlignUp(size, Memory::YUZU_PAGESIZE) >> Memory::YUZU_PAGEBITS;
std::atomic_thread_fence(std::memory_order_acquire);
for (size_t i = 0; i < num_pages; i++) {
auto* ptr = process_memory->GetPointer(
Common::ProcessAddress(virtual_address + i * Memory::YUZU_PAGESIZE));
const VAddr new_vaddress = virtual_address + i * Memory::YUZU_PAGESIZE;
auto* ptr = process_memory->GetPointer(Common::ProcessAddress(new_vaddress));
if (ptr == nullptr) [[unlikely]] {
compressed_physical_ptr[start_page_d + i] = 0;
continue;
@ -147,6 +155,7 @@ void DeviceMemoryManager<Traits>::Map(DAddr address, VAddr virtual_address, size
auto phys_addr = static_cast<u32>(GetRawPhysicalAddr(ptr) >> Memory::YUZU_PAGEBITS) + 1U;
compressed_physical_ptr[start_page_d + i] = phys_addr;
compressed_device_addr[phys_addr - 1U] = static_cast<u32>(start_page_d + i);
InsertCPUBacking(start_page_d + i, new_vaddress, process_id);
}
std::atomic_thread_fence(std::memory_order_release);
}
@ -159,6 +168,7 @@ void DeviceMemoryManager<Traits>::Unmap(DAddr address, size_t size) {
for (size_t i = 0; i < num_pages; i++) {
auto phys_addr = compressed_physical_ptr[start_page_d + i];
compressed_physical_ptr[start_page_d + i] = 0;
cpu_backing_address[start_page_d + i] = 0;
if (phys_addr != 0) {
compressed_device_addr[phys_addr - 1] = 0;
}
@ -301,4 +311,66 @@ void DeviceMemoryManager<Traits>::UnregisterProcess(size_t id) {
id_pool.push_front(id);
}
template <typename Traits>
void DeviceMemoryManager<Traits>::UpdatePagesCachedCount(DAddr addr, size_t size, s32 delta) {
u64 uncache_begin = 0;
u64 cache_begin = 0;
u64 uncache_bytes = 0;
u64 cache_bytes = 0;
const auto* MarkRegionCaching = &DeviceMemoryManager<Traits>::DeviceMethods::MarkRegionCaching;
std::atomic_thread_fence(std::memory_order_acquire);
const size_t page_end = Common::DivCeil(addr + size, Memory::YUZU_PAGESIZE);
size_t page = addr >> Memory::YUZU_PAGEBITS;
auto [process_id, base_vaddress] = ExtractCPUBacking(page);
size_t vpage = base_vaddress >> Memory::YUZU_PAGEBITS;
auto* memory_interface = registered_processes[process_id];
for (; page != page_end; ++page) {
std::atomic_uint16_t& count = cached_pages->at(page >> 2).Count(page);
if (delta > 0) {
ASSERT_MSG(count.load(std::memory_order::relaxed) < std::numeric_limits<u16>::max(),
"Count may overflow!");
} else if (delta < 0) {
ASSERT_MSG(count.load(std::memory_order::relaxed) > 0, "Count may underflow!");
} else {
ASSERT_MSG(false, "Delta must be non-zero!");
}
// Adds or subtracts 1, as count is a unsigned 8-bit value
count.fetch_add(static_cast<u16>(delta), std::memory_order_release);
// Assume delta is either -1 or 1
if (count.load(std::memory_order::relaxed) == 0) {
if (uncache_bytes == 0) {
uncache_begin = vpage;
}
uncache_bytes += Memory::YUZU_PAGESIZE;
} else if (uncache_bytes > 0) {
MarkRegionCaching(memory_interface, uncache_begin << Memory::YUZU_PAGEBITS,
uncache_bytes, false);
uncache_bytes = 0;
}
if (count.load(std::memory_order::relaxed) == 1 && delta > 0) {
if (cache_bytes == 0) {
cache_begin = vpage;
}
cache_bytes += Memory::YUZU_PAGESIZE;
} else if (cache_bytes > 0) {
MarkRegionCaching(memory_interface, cache_begin << Memory::YUZU_PAGEBITS, cache_bytes,
true);
cache_bytes = 0;
}
vpage++;
}
if (uncache_bytes > 0) {
MarkRegionCaching(memory_interface, uncache_begin << Memory::YUZU_PAGEBITS, uncache_bytes,
false);
}
if (cache_bytes > 0) {
MarkRegionCaching(memory_interface, cache_begin << Memory::YUZU_PAGEBITS, cache_bytes,
true);
}
}
} // namespace Core

11
src/video_core/host1x/gpu_device_memory_manager.cpp
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@ -5,6 +5,17 @@
#include "video_core/host1x/gpu_device_memory_manager.h"
#include "video_core/rasterizer_interface.h"
namespace Tegra {
struct MaxwellDeviceMethods {
static inline void MarkRegionCaching(Core::Memory::Memory* interface, VAddr address,
size_t size, bool caching) {
interface->RasterizerMarkRegionCached(address, size, caching);
}
};
} // namespace Tegra
template struct Core::DeviceMemoryManagerAllocator<Tegra::MaxwellDeviceTraits>;
template class Core::DeviceMemoryManager<Tegra::MaxwellDeviceTraits>;

3
src/video_core/host1x/gpu_device_memory_manager.h
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@ -9,10 +9,13 @@ class RasterizerInterface;
namespace Tegra {
struct MaxwellDeviceMethods;
struct MaxwellDeviceTraits {
static constexpr bool supports_pinning = true;
static constexpr size_t device_virtual_bits = 34;
using DeviceInterface = typename VideoCore::RasterizerInterface;
using DeviceMethods = typename MaxwellDeviceMethods;
};
using MaxwellDeviceMemoryManager = Core::DeviceMemoryManager<MaxwellDeviceTraits>;