| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "guest/vsoc/lib/gralloc_region_view.h" |
| |
| #include <common/vsoc/lib/lock_guard.h> |
| #include <log/log.h> |
| #include <sys/types.h> |
| #include <uapi/vsoc_shm.h> |
| #include <atomic> |
| |
| using vsoc::gralloc::GrallocRegionView; |
| using vsoc::layout::gralloc::BufferEntry; |
| using vsoc::layout::gralloc::GrallocBufferLayout; |
| using vsoc::layout::gralloc::GrallocManagerLayout; |
| |
| namespace { |
| template <typename T> |
| inline T gralloc_align(T val) { |
| return (val + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1); |
| } |
| |
| // Use the thread id to identify the original creator of a buffer. |
| inline uint32_t gralloc_owned_value() { |
| return gettid(); |
| } |
| |
| } // namespace |
| |
| bool GrallocRegionView::Open() { |
| if (!vsoc::ManagerRegionView<GrallocManagerLayout>::Open()) { |
| return false; |
| } |
| std::shared_ptr<vsoc::RegionControl> managed_region = |
| vsoc::RegionControl::Open( |
| GrallocManagerLayout::ManagedRegion::region_name); |
| if (!managed_region) { |
| LOG_FATAL("Unable to open managed region"); |
| return false; |
| } |
| offset_of_buffer_memory_ = gralloc_align<vsoc_reg_off_t>( |
| managed_region->region_desc().offset_of_region_data); |
| total_buffer_memory_ = |
| managed_region->region_size() - offset_of_buffer_memory_; |
| |
| // TODO(jemoreira): Handle the case of unexpected values in the region. |
| return true; |
| } |
| |
| int GrallocRegionView::AllocateBuffer(size_t size, uint32_t* begin_offset) { |
| size = gralloc_align<size_t>(size); |
| // Cache the value of buffer_count in shared memory. |
| uint32_t buffer_count_local = 0; |
| { |
| vsoc::LockGuard<vsoc::layout::GuestLock>(&data()->new_buffer_lock); |
| buffer_count_local = data()->buffer_count; |
| } |
| // Find a free buffer entry of the appropriate size. |
| for (uint32_t idx = 0; idx < buffer_count_local; ++idx) { |
| BufferEntry& entry = data()->buffers_table[idx]; |
| if (entry.owned_by == VSOC_REGION_FREE && entry.buffer_size() == size) { |
| int fd = control_->CreateFdScopedPermission( |
| GrallocManagerLayout::ManagedRegion::region_name, |
| pointer_to_region_offset(&entry.owned_by), |
| gralloc_owned_value(), |
| entry.buffer_begin, |
| entry.buffer_end); |
| if (fd >= 0) { |
| if (begin_offset) { |
| *begin_offset = entry.buffer_begin; |
| } |
| return fd; |
| } |
| } |
| } |
| |
| // We couldn't find any suitable buffer, create one |
| { |
| vsoc::LockGuard<vsoc::layout::GuestLock>(&data()->new_buffer_lock); |
| // don't use the cached value here!!! |
| uint32_t idx = data()->buffer_count; |
| if (pointer_to_region_offset(&data()->buffers_table[idx + 1]) > |
| control_->region_size()) { |
| ALOGE( |
| "Out of memory in gralloc_manager (total: %d, used: %d, " |
| "requested: %d)", |
| static_cast<int>(control_->region_size()), |
| static_cast<int>( |
| pointer_to_region_offset(&data()->buffers_table[idx])), |
| static_cast<int>(sizeof(data()->buffers_table[idx]))); |
| return -ENOMEM; |
| } |
| if (total_buffer_memory_ - data()->allocated_buffer_memory < size) { |
| ALOGE( |
| "Out of memory in gralloc_memory (total: %d, used: %d, requested: %d)", |
| static_cast<int>(total_buffer_memory_), |
| static_cast<int>(data()->allocated_buffer_memory), |
| static_cast<int>(size)); |
| return -ENOMEM; |
| } |
| // Initialize the buffer entry and acquire ownership |
| // Do it before increasing buffer_count so that another thread looking for |
| // free entries doesn't find this one |
| BufferEntry& new_entry = data()->buffers_table[idx]; |
| new_entry.buffer_begin = |
| offset_of_buffer_memory_ + data()->allocated_buffer_memory; |
| data()->allocated_buffer_memory += size; |
| new_entry.buffer_end = new_entry.buffer_begin + size; |
| int fd = control_->CreateFdScopedPermission( |
| GrallocManagerLayout::ManagedRegion::region_name, |
| pointer_to_region_offset(&new_entry.owned_by), |
| gralloc_owned_value(), |
| new_entry.buffer_begin, |
| new_entry.buffer_end); |
| if (fd < 0) { |
| LOG_FATAL( |
| "Unexpected error while creating fd scoped permission over " |
| "uncontested memory: %s", |
| strerror(-fd)); |
| return fd; |
| } |
| // Increment buffer_count now that the entry can't be taken from us |
| data()->buffer_count++; |
| if (begin_offset) { |
| *begin_offset = new_entry.buffer_begin; |
| } |
| return fd; |
| } |
| } |
| |
| |
| std::shared_ptr<GrallocRegionView> GrallocRegionView::GetInstance() { |
| return RegionView::GetInstanceImpl<GrallocRegionView>( |
| std::mem_fn(&GrallocRegionView::Open)); |
| } |