Jiwen 'Steve' Cai | c6fcf2f | 2018-09-27 23:34:45 -0700 | [diff] [blame] | 1 | #include <private/dvr/consumer_buffer.h> |
| 2 | |
| 3 | using android::pdx::LocalChannelHandle; |
| 4 | using android::pdx::LocalHandle; |
| 5 | using android::pdx::Status; |
| 6 | |
| 7 | namespace android { |
| 8 | namespace dvr { |
| 9 | |
| 10 | ConsumerBuffer::ConsumerBuffer(LocalChannelHandle channel) |
| 11 | : BASE(std::move(channel)) { |
| 12 | const int ret = ImportBuffer(); |
| 13 | if (ret < 0) { |
| 14 | ALOGE("ConsumerBuffer::ConsumerBuffer: Failed to import buffer: %s", |
| 15 | strerror(-ret)); |
| 16 | Close(ret); |
| 17 | } |
| 18 | } |
| 19 | |
| 20 | std::unique_ptr<ConsumerBuffer> ConsumerBuffer::Import( |
| 21 | LocalChannelHandle channel) { |
| 22 | ATRACE_NAME("ConsumerBuffer::Import"); |
| 23 | ALOGD_IF(TRACE, "ConsumerBuffer::Import: channel=%d", channel.value()); |
| 24 | return ConsumerBuffer::Create(std::move(channel)); |
| 25 | } |
| 26 | |
| 27 | std::unique_ptr<ConsumerBuffer> ConsumerBuffer::Import( |
| 28 | Status<LocalChannelHandle> status) { |
| 29 | return Import(status ? status.take() |
| 30 | : LocalChannelHandle{nullptr, -status.error()}); |
| 31 | } |
| 32 | |
| 33 | int ConsumerBuffer::LocalAcquire(DvrNativeBufferMetadata* out_meta, |
| 34 | LocalHandle* out_fence) { |
| 35 | if (!out_meta) |
| 36 | return -EINVAL; |
| 37 | |
Tianyu | f669f6a | 2018-10-10 15:34:32 -0700 | [diff] [blame] | 38 | // The buffer can be acquired iff the buffer state for this client is posted. |
Tianyu Jiang | a99f911 | 2018-12-13 18:23:07 -0800 | [diff] [blame^] | 39 | uint32_t current_buffer_state = |
Tianyu | f669f6a | 2018-10-10 15:34:32 -0700 | [diff] [blame] | 40 | buffer_state_->load(std::memory_order_acquire); |
| 41 | if (!BufferHubDefs::IsClientPosted(current_buffer_state, |
| 42 | client_state_mask())) { |
| 43 | ALOGE( |
| 44 | "%s: Failed to acquire the buffer. The buffer is not posted, id=%d " |
Tianyu Jiang | a99f911 | 2018-12-13 18:23:07 -0800 | [diff] [blame^] | 45 | "state=%" PRIx32 " client_state_mask=%" PRIx32 ".", |
Tianyu | f669f6a | 2018-10-10 15:34:32 -0700 | [diff] [blame] | 46 | __FUNCTION__, id(), current_buffer_state, client_state_mask()); |
Jiwen 'Steve' Cai | c6fcf2f | 2018-09-27 23:34:45 -0700 | [diff] [blame] | 47 | return -EBUSY; |
| 48 | } |
| 49 | |
Tianyu | f669f6a | 2018-10-10 15:34:32 -0700 | [diff] [blame] | 50 | // Change the buffer state for this consumer from posted to acquired. |
Tianyu Jiang | a99f911 | 2018-12-13 18:23:07 -0800 | [diff] [blame^] | 51 | uint32_t updated_buffer_state = current_buffer_state ^ client_state_mask(); |
Tianyu | f669f6a | 2018-10-10 15:34:32 -0700 | [diff] [blame] | 52 | while (!buffer_state_->compare_exchange_weak( |
| 53 | current_buffer_state, updated_buffer_state, std::memory_order_acq_rel, |
| 54 | std::memory_order_acquire)) { |
| 55 | ALOGD( |
| 56 | "%s Failed to acquire the buffer. Current buffer state was changed to " |
Tianyu Jiang | a99f911 | 2018-12-13 18:23:07 -0800 | [diff] [blame^] | 57 | "%" PRIx32 |
Tianyu | f669f6a | 2018-10-10 15:34:32 -0700 | [diff] [blame] | 58 | " when trying to acquire the buffer and modify the buffer state to " |
Tianyu Jiang | a99f911 | 2018-12-13 18:23:07 -0800 | [diff] [blame^] | 59 | "%" PRIx32 ". About to try again if the buffer is still posted.", |
Tianyu | f669f6a | 2018-10-10 15:34:32 -0700 | [diff] [blame] | 60 | __FUNCTION__, current_buffer_state, updated_buffer_state); |
| 61 | if (!BufferHubDefs::IsClientPosted(current_buffer_state, |
| 62 | client_state_mask())) { |
| 63 | ALOGE( |
| 64 | "%s: Failed to acquire the buffer. The buffer is no longer posted, " |
Tianyu Jiang | a99f911 | 2018-12-13 18:23:07 -0800 | [diff] [blame^] | 65 | "id=%d state=%" PRIx32 " client_state_mask=%" PRIx32 ".", |
Tianyu | f669f6a | 2018-10-10 15:34:32 -0700 | [diff] [blame] | 66 | __FUNCTION__, id(), current_buffer_state, client_state_mask()); |
| 67 | return -EBUSY; |
| 68 | } |
| 69 | // The failure of compare_exchange_weak updates current_buffer_state. |
| 70 | updated_buffer_state = current_buffer_state ^ client_state_mask(); |
| 71 | } |
| 72 | |
Jiwen 'Steve' Cai | c6fcf2f | 2018-09-27 23:34:45 -0700 | [diff] [blame] | 73 | // Copy the canonical metadata. |
| 74 | void* metadata_ptr = reinterpret_cast<void*>(&metadata_header_->metadata); |
| 75 | memcpy(out_meta, metadata_ptr, sizeof(DvrNativeBufferMetadata)); |
| 76 | // Fill in the user_metadata_ptr in address space of the local process. |
| 77 | if (out_meta->user_metadata_size) { |
| 78 | out_meta->user_metadata_ptr = |
| 79 | reinterpret_cast<uint64_t>(user_metadata_ptr_); |
| 80 | } else { |
| 81 | out_meta->user_metadata_ptr = 0; |
| 82 | } |
| 83 | |
Tianyu Jiang | a99f911 | 2018-12-13 18:23:07 -0800 | [diff] [blame^] | 84 | uint32_t fence_state = fence_state_->load(std::memory_order_acquire); |
Jiwen 'Steve' Cai | c6fcf2f | 2018-09-27 23:34:45 -0700 | [diff] [blame] | 85 | // If there is an acquire fence from producer, we need to return it. |
Tianyu Jiang | 63dd7c3 | 2018-10-30 18:35:06 -0700 | [diff] [blame] | 86 | // The producer state bit mask is kFirstClientBitMask for now. |
| 87 | if (fence_state & BufferHubDefs::kFirstClientBitMask) { |
Jiwen 'Steve' Cai | c6fcf2f | 2018-09-27 23:34:45 -0700 | [diff] [blame] | 88 | *out_fence = shared_acquire_fence_.Duplicate(); |
| 89 | } |
| 90 | |
Jiwen 'Steve' Cai | c6fcf2f | 2018-09-27 23:34:45 -0700 | [diff] [blame] | 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | int ConsumerBuffer::Acquire(LocalHandle* ready_fence) { |
| 95 | return Acquire(ready_fence, nullptr, 0); |
| 96 | } |
| 97 | |
| 98 | int ConsumerBuffer::Acquire(LocalHandle* ready_fence, void* meta, |
| 99 | size_t user_metadata_size) { |
| 100 | ATRACE_NAME("ConsumerBuffer::Acquire"); |
| 101 | |
| 102 | if (const int error = CheckMetadata(user_metadata_size)) |
| 103 | return error; |
| 104 | |
| 105 | DvrNativeBufferMetadata canonical_meta; |
| 106 | if (const int error = LocalAcquire(&canonical_meta, ready_fence)) |
| 107 | return error; |
| 108 | |
| 109 | if (meta && user_metadata_size) { |
| 110 | void* metadata_src = |
| 111 | reinterpret_cast<void*>(canonical_meta.user_metadata_ptr); |
| 112 | if (metadata_src) { |
| 113 | memcpy(meta, metadata_src, user_metadata_size); |
| 114 | } else { |
| 115 | ALOGW("ConsumerBuffer::Acquire: no user-defined metadata."); |
| 116 | } |
| 117 | } |
| 118 | |
| 119 | auto status = InvokeRemoteMethod<BufferHubRPC::ConsumerAcquire>(); |
| 120 | if (!status) |
| 121 | return -status.error(); |
| 122 | return 0; |
| 123 | } |
| 124 | |
| 125 | int ConsumerBuffer::AcquireAsync(DvrNativeBufferMetadata* out_meta, |
| 126 | LocalHandle* out_fence) { |
| 127 | ATRACE_NAME("ConsumerBuffer::AcquireAsync"); |
| 128 | |
| 129 | if (const int error = LocalAcquire(out_meta, out_fence)) |
| 130 | return error; |
| 131 | |
| 132 | auto status = SendImpulse(BufferHubRPC::ConsumerAcquire::Opcode); |
| 133 | if (!status) |
| 134 | return -status.error(); |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | int ConsumerBuffer::LocalRelease(const DvrNativeBufferMetadata* meta, |
| 139 | const LocalHandle& release_fence) { |
| 140 | if (const int error = CheckMetadata(meta->user_metadata_size)) |
| 141 | return error; |
| 142 | |
Tianyu | f669f6a | 2018-10-10 15:34:32 -0700 | [diff] [blame] | 143 | // Set the buffer state of this client to released if it is not already in |
| 144 | // released state. |
Tianyu Jiang | a99f911 | 2018-12-13 18:23:07 -0800 | [diff] [blame^] | 145 | uint32_t current_buffer_state = |
Tianyu | f669f6a | 2018-10-10 15:34:32 -0700 | [diff] [blame] | 146 | buffer_state_->load(std::memory_order_acquire); |
| 147 | if (BufferHubDefs::IsClientReleased(current_buffer_state, |
| 148 | client_state_mask())) { |
| 149 | return 0; |
| 150 | } |
Tianyu Jiang | a99f911 | 2018-12-13 18:23:07 -0800 | [diff] [blame^] | 151 | uint32_t updated_buffer_state = current_buffer_state & (~client_state_mask()); |
Tianyu | f669f6a | 2018-10-10 15:34:32 -0700 | [diff] [blame] | 152 | while (!buffer_state_->compare_exchange_weak( |
| 153 | current_buffer_state, updated_buffer_state, std::memory_order_acq_rel, |
| 154 | std::memory_order_acquire)) { |
| 155 | ALOGD( |
| 156 | "%s: Failed to release the buffer. Current buffer state was changed to " |
Tianyu Jiang | a99f911 | 2018-12-13 18:23:07 -0800 | [diff] [blame^] | 157 | "%" PRIx32 |
Tianyu | f669f6a | 2018-10-10 15:34:32 -0700 | [diff] [blame] | 158 | " when trying to release the buffer and modify the buffer state to " |
Tianyu Jiang | a99f911 | 2018-12-13 18:23:07 -0800 | [diff] [blame^] | 159 | "%" PRIx32 ". About to try again.", |
Tianyu | f669f6a | 2018-10-10 15:34:32 -0700 | [diff] [blame] | 160 | __FUNCTION__, current_buffer_state, updated_buffer_state); |
| 161 | // The failure of compare_exchange_weak updates current_buffer_state. |
| 162 | updated_buffer_state = current_buffer_state & (~client_state_mask()); |
Jiwen 'Steve' Cai | c6fcf2f | 2018-09-27 23:34:45 -0700 | [diff] [blame] | 163 | } |
| 164 | |
| 165 | // On release, only the user requested metadata is copied back into the shared |
| 166 | // memory for metadata. Since there are multiple consumers, it doesn't make |
| 167 | // sense to send the canonical metadata back to the producer. However, one of |
| 168 | // the consumer can still choose to write up to user_metadata_size bytes of |
| 169 | // data into user_metadata_ptr. |
| 170 | if (meta->user_metadata_ptr && meta->user_metadata_size) { |
| 171 | void* metadata_src = reinterpret_cast<void*>(meta->user_metadata_ptr); |
| 172 | memcpy(user_metadata_ptr_, metadata_src, meta->user_metadata_size); |
| 173 | } |
| 174 | |
| 175 | // Send out the release fence through the shared epoll fd. Note that during |
| 176 | // releasing the producer is not expected to be polling on the fence. |
| 177 | if (const int error = UpdateSharedFence(release_fence, shared_release_fence_)) |
| 178 | return error; |
| 179 | |
Jiwen 'Steve' Cai | c6fcf2f | 2018-09-27 23:34:45 -0700 | [diff] [blame] | 180 | return 0; |
| 181 | } |
| 182 | |
| 183 | int ConsumerBuffer::Release(const LocalHandle& release_fence) { |
| 184 | ATRACE_NAME("ConsumerBuffer::Release"); |
| 185 | |
| 186 | DvrNativeBufferMetadata meta; |
| 187 | if (const int error = LocalRelease(&meta, release_fence)) |
| 188 | return error; |
| 189 | |
| 190 | return ReturnStatusOrError(InvokeRemoteMethod<BufferHubRPC::ConsumerRelease>( |
| 191 | BorrowedFence(release_fence.Borrow()))); |
| 192 | } |
| 193 | |
| 194 | int ConsumerBuffer::ReleaseAsync() { |
| 195 | DvrNativeBufferMetadata meta; |
| 196 | return ReleaseAsync(&meta, LocalHandle()); |
| 197 | } |
| 198 | |
| 199 | int ConsumerBuffer::ReleaseAsync(const DvrNativeBufferMetadata* meta, |
| 200 | const LocalHandle& release_fence) { |
| 201 | ATRACE_NAME("ConsumerBuffer::ReleaseAsync"); |
| 202 | |
| 203 | if (const int error = LocalRelease(meta, release_fence)) |
| 204 | return error; |
| 205 | |
| 206 | return ReturnStatusOrError( |
| 207 | SendImpulse(BufferHubRPC::ConsumerRelease::Opcode)); |
| 208 | } |
| 209 | |
| 210 | int ConsumerBuffer::Discard() { return Release(LocalHandle()); } |
| 211 | |
Jiwen 'Steve' Cai | c6fcf2f | 2018-09-27 23:34:45 -0700 | [diff] [blame] | 212 | } // namespace dvr |
| 213 | } // namespace android |