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/*
** Copyright (c) 2021 LunarG, Inc.
**
** Permission is hereby granted, free of charge, to any person obtaining a
** copy of this software and associated documentation files (the "Software"),
** to deal in the Software without restriction, including without limitation
** the rights to use, copy, modify, merge, publish, distribute, sublicense,
** and/or sell copies of the Software, and to permit persons to whom the
** Software is furnished to do so, subject to the following conditions:
**
** The above copyright notice and this permission notice shall be included in
** all copies or substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
** FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
** DEALINGS IN THE SOFTWARE.
*/
#include "graphics/dx12_gpu_va_map.h"
#include "util/logging.h"
GFXRECON_BEGIN_NAMESPACE(gfxrecon)
GFXRECON_BEGIN_NAMESPACE(graphics)
constexpr uint64_t kNullAddress = 0;
void Dx12GpuVaMap::Add(format::HandleId resource_id,
uint64_t old_start_address,
uint64_t old_size,
uint64_t new_start_address)
{
if ((resource_id != format::kNullHandleId) && (old_start_address != kNullAddress) &&
(new_start_address != kNullAddress))
{
auto& aliased_resource_list = gpu_va_map_[old_start_address];
auto& resource_info = aliased_resource_list[resource_id];
resource_info.old_end_address = old_start_address + old_size;
resource_info.new_start_address = new_start_address;
}
}
void Dx12GpuVaMap::Remove(format::HandleId resource_id, uint64_t old_start_address)
{
if ((resource_id != format::kNullHandleId) && (old_start_address != kNullAddress))
{
auto entry = gpu_va_map_.find(old_start_address);
if (entry != gpu_va_map_.end())
{
entry->second.erase(resource_id);
if (entry->second.empty())
{
gpu_va_map_.erase(entry);
}
}
}
}
uint64_t Dx12GpuVaMap::Map(uint64_t address, format::HandleId* resource_id, bool* found) const
{
bool local_found = false;
if (address != kNullAddress)
{
auto va_entry = gpu_va_map_.lower_bound(address);
if (va_entry != gpu_va_map_.end())
{
// Check for a match in the aliased resource list.
local_found = FindMatch(va_entry->second, va_entry->first, address, resource_id);
// The addresses did not fall within the address range of the resource(s) at the start address returned
// by the lower_bound search. These resources may be aliased with a larger resource that contains them.
// Check for an aliased resource with a smaller start address. The entries in the GPU VA map are sorted
// in descending order to get a <= behavior from lower_bound, so the next smallest address is obtained
// by incrementing the iterator.
// NOTE: This turns the O(logn) search into a O(n) search when an entry is not found in the map. If this
// becomes an issue, it is possible that the add and remove operations be changed to merge all aliased
// resources into a single entry keyed by the smallest start address of all of the aliased resources. On
// remove, if none of the remaining aliased resources share the start address that is used for the key to
// the entry, the entry would need to be removed and re-added with the smallest address of the remaining
// aliased resources as the key.
while (!local_found && ++va_entry != gpu_va_map_.end())
{
local_found = FindMatch(va_entry->second, va_entry->first, address, resource_id);
}
}
if (!local_found && (found == nullptr))
{
GFXRECON_LOG_WARNING_ONCE("No matching replay address found for capture address.");
}
}
if (found != nullptr)
{
(*found) = local_found;
}
return address;
}
bool Dx12GpuVaMap::FindMatch(const AliasedResourceVaInfo& resource_info,
uint64_t old_start_address,
uint64_t& address,
format::HandleId* resource_id) const
{
// Check for a match in the aliased resource list.
for (const auto& resource_entry : resource_info)
{
const auto& info = resource_entry.second;
if (address < info.old_end_address)
{
address = info.new_start_address + (address - old_start_address);
if (resource_id != nullptr)
{
*resource_id = resource_entry.first;
}
return true;
}
}
return false;
}
GFXRECON_END_NAMESPACE(graphics)
GFXRECON_END_NAMESPACE(gfxrecon)
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