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Misc code cleanup and more comments in AS map

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This commit is contained in:
Billy Laws 2021-09-17 19:41:23 +01:00
parent 33f8be6f52
commit 67149ef7fb
2 changed files with 31 additions and 20 deletions
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39
app/src/main/cpp/skyline/common/address_space.inc
View File

@ -27,7 +27,7 @@ namespace skyline {
auto blockEndSuccessor{std::lower_bound(blocks.begin(), blocks.end(), virtEnd)};
if (blockEndSuccessor == blocks.begin())
throw exception("Unexpected Memory Manager state!");
throw exception("Trying to map a block before the VA start!");
auto blockEndPredecessor{std::prev(blockEndSuccessor)};
@ -36,7 +36,7 @@ namespace skyline {
if (blockEndSuccessor->virt != virtEnd) {
PaType tailPhys{[&]() -> PaType {
if (!PaContigSplit || blockEndPredecessor->Unmapped())
return blockEndPredecessor->phys; // Always propagate unmapped regions
return blockEndPredecessor->phys; // Always propagate unmapped regions rather than calculating offset
else
return blockEndPredecessor->phys + virtEnd - blockEndPredecessor->virt;
}()};
@ -70,14 +70,15 @@ namespace skyline {
while (std::prev(blockStartSuccessor)->virt >= virt)
std::advance(blockStartSuccessor, -1);
if (blockStartSuccessor->virt > virtEnd)
throw exception("Unexpected Memory Manager state!");
if (blockStartSuccessor->virt == virtEnd) {
// Check that the start successor is either the end block or something in between
if (blockStartSuccessor->virt > virtEnd) {
throw exception("Unsorted block in AS map!");
} else if (blockStartSuccessor->virt == virtEnd) {
// We need to create a new block as there are none spare that we would overwrite
blocks.insert(blockStartSuccessor, Block(virt, phys, flag));
return;
} else {
// Reuse a block that would otherwise be overwritten as a start block
blockStartSuccessor->virt = virt;
blockStartSuccessor->phys = phys;
blockStartSuccessor->flag = flag;
@ -85,7 +86,7 @@ namespace skyline {
// Erase overwritten blocks
if (auto eraseStart{std::next(blockStartSuccessor)}; blockStartSuccessor != blockEndPredecessor) {
if (eraseStart == blockEndPredecessor)
__builtin_trap();
throw exception("Trying to erase the end block of a newly mapped region!");
blocks.erase(eraseStart, blockEndPredecessor);
}
@ -98,11 +99,11 @@ namespace skyline {
VaType virtEnd{virt + size};
if (virtEnd > vaLimit)
throw exception("Trying to map a block past the VA limit!");
throw exception("Trying to unmap a block past the VA limit!");
auto blockEndSuccessor{std::lower_bound(blocks.begin(), blocks.end(), virtEnd)};
if (blockEndSuccessor == blocks.begin())
throw exception("Unexpected Memory Manager state!");
throw exception("Trying to unmap a block before the VA start!");
auto blockEndPredecessor{std::prev(blockEndSuccessor)};
@ -113,7 +114,7 @@ namespace skyline {
return iter;
}};
auto eraseBlocksWithEndUnmapped{[&] (auto unmappedEnd) {
auto eraseBlocksWithEndUnmapped{[&](auto unmappedEnd) {
auto blockStartPredecessor{walkBackToPredecessor(unmappedEnd)};
auto blockStartSuccessor{std::next(blockStartPredecessor)};
@ -130,7 +131,7 @@ namespace skyline {
// We can't have two unmapped regions after each other
if (eraseEnd == blockStartSuccessor || (blockStartPredecessor->Unmapped() && eraseEnd->Unmapped()))
throw exception("Unexpected Memory Manager state!");
throw exception("Multiple contiguous unmapped regions are unsupported!");
blocks.erase(blockStartSuccessor, eraseEnd);
}};
@ -172,10 +173,9 @@ namespace skyline {
auto blockStartPredecessor{walkBackToPredecessor(blockEndPredecessor)};
auto blockStartSuccessor{std::next(blockStartPredecessor)};
if (blockStartSuccessor->virt > virtEnd)
throw exception("Unexpected Memory Manager state!");
if (blockStartSuccessor->virt == virtEnd) {
if (blockStartSuccessor->virt > virtEnd) {
throw exception("Unsorted block in AS map!");
} else if (blockStartSuccessor->virt == virtEnd) {
// There are no blocks between the start and the end that would let us skip inserting a new one for head
// The previous block is may be unmapped, if so we don't need to insert any unmaps after it
@ -192,7 +192,7 @@ namespace skyline {
// Erase overwritten blocks, skipping the first one as we have written the unmapped start block there
if (auto eraseStart{std::next(blockStartSuccessor)}; blockStartSuccessor != blockEndPredecessor) {
if (eraseStart == blockEndPredecessor)
__builtin_trap();
throw exception("Unexpected Memory Manager state!");
blocks.erase(eraseStart, blockEndPredecessor);
}
@ -225,6 +225,7 @@ namespace skyline {
u8 *blockPhys{predecessor->phys + (virt - predecessor->virt)};
VaType blockReadSize{std::min(successor->virt - virt, size)};
// Reads may span across multiple individual blocks
while (size) {
if (predecessor->phys == nullptr) {
if (predecessor->flag) // Sparse mapping
@ -262,6 +263,7 @@ namespace skyline {
u8 *blockPhys{predecessor->phys + (virt - predecessor->virt)};
VaType blockWriteSize{std::min(successor->virt - virt, size)};
// Writes may span across multiple individual blocks
while (size) {
if (predecessor->phys == nullptr) {
if (!predecessor->flag) // Sparse mappings allow unmapped writes
@ -292,15 +294,17 @@ namespace skyline {
VaType allocStart{UnmappedVa};
VaType allocEnd{currentLinearAllocEnd + size};
// Avoid searching backwards in the address space if possible
if (allocEnd >= currentLinearAllocEnd && allocEnd <= this->vaLimit) {
auto allocEndSuccessor{std::lower_bound(this->blocks.begin(), this->blocks.end(), allocEnd)};
if (allocEndSuccessor == this->blocks.begin())
throw exception("Unexpected allocator state!");
throw exception("First block in AS map is invalid!");
auto allocEndPredecessor{std::prev(allocEndSuccessor)};
if (allocEndPredecessor->virt <= currentLinearAllocEnd) {
allocStart = currentLinearAllocEnd;
} else {
// Skip over fixed any mappings in front of us
while (allocEndSuccessor != this->blocks.end()) {
if (allocEndSuccessor->virt - allocEndPredecessor->virt < size || allocEndPredecessor->Mapped() ) {
allocStart = allocEndPredecessor->virt;
@ -309,6 +313,7 @@ namespace skyline {
allocEndPredecessor = allocEndSuccessor++;
// Use the VA limit to calculate if we can fit in the final block since it has no successor
if (allocEndSuccessor == this->blocks.end()) {
allocEnd = allocEndPredecessor->virt + size;

10
app/src/main/cpp/skyline/services/nvdrv/devices/nvhost/as_gpu.cpp
View File

@ -12,6 +12,8 @@ namespace skyline {
}
namespace skyline::service::nvdrv::device::nvhost {
using GMMU = soc::gm20b::GM20B::GMMU;
AsGpu::AsGpu(const DeviceState &state, Core &core, const SessionContext &ctx) : NvDevice(state, core, ctx) {}
PosixResult AsGpu::BindChannel(In<FileDescriptor> channelFd) {
@ -45,7 +47,7 @@ namespace skyline::service::nvdrv::device::nvhost {
u64 size{static_cast<u64>(pages) * static_cast<u64>(pageSize)};
if (flags.sparse)
state.soc->gm20b.gmmu.Map(offset, soc::gm20b::GM20B::GMMU::SparsePlaceholderAddress(), size, true);
state.soc->gm20b.gmmu.Map(offset, GMMU::SparsePlaceholderAddress(), size, true);
allocationMap[offset] = {
.size = size,
@ -74,8 +76,10 @@ namespace skyline::service::nvdrv::device::nvhost {
allocator->Free(mapping->offset >> pageSizeBits, mapping->size >> pageSizeBits);
}
// Sparse mappings shouldn't be fully unmapped, just returned to their sparse state
// Only FreeSpace can unmap them fully
if (mapping->sparseAlloc)
state.soc->gm20b.gmmu.Map(offset, soc::gm20b::GM20B::GMMU::SparsePlaceholderAddress(), mapping->size, true);
state.soc->gm20b.gmmu.Map(offset, GMMU::SparsePlaceholderAddress(), mapping->size, true);
else
state.soc->gm20b.gmmu.Unmap(offset, mapping->size);
@ -93,6 +97,7 @@ namespace skyline::service::nvdrv::device::nvhost {
state.logger->Debug("flags: ( fixed: {}, remap: {} ), kind: {}, handle: {}, bufferOffset: 0x{:X}, mappingSize: 0x{:X}, offset: 0x{:X}", flags.fixed, flags.remap, kind, handle, bufferOffset, mappingSize, offset);
// Remaps a subregion of an existing mapping to a different PA
if (flags.remap) {
try {
auto mapping{mappingMap.at(offset)};
@ -206,6 +211,7 @@ namespace skyline::service::nvdrv::device::nvhost {
vm.vaRangeStart = bigPageSize << VM::VaStartShift;
}
// If this is unspecified then default values should be used
if (vaRangeStart) {
vm.vaRangeStart = vaRangeStart;
vm.vaRangeSplit = vaRangeSplit;