utils/src/PalRingBuffer.cpp - LeafOS-Project/android_vendor_qcom_opensource_arpal-lx - Gitiles

 /*
  * Copyright (c) 2019-2021, The Linux Foundation. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *     * Redistributions of source code must retain the above copyright
  *       notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  *       copyright notice, this list of conditions and the following
  *       disclaimer in the documentation and/or other materials provided
  *       with the distribution.
  *     * Neither the name of The Linux Foundation nor the names of its
  *       contributors may be used to endorse or promote products derived
  *       from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
  * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */


 #ifdef LINUX_ENABLED
 #include <algorithm>
 #endif
 #include "PalRingBuffer.h"
 #include "PalCommon.h"
 #define LOG_TAG "PAL: PalRingBuffer"

 int32_t PalRingBuffer::removeReader(PalRingBufferReader *reader)
 {
     auto iter = std::find(readOffsets_.begin(), readOffsets_.end(), reader);
     if (iter != readOffsets_.end())
         readOffsets_.erase(iter);

     return 0;
 }

 size_t PalRingBuffer::read(std::shared_ptr<PalRingBufferReader>reader __unused,
                            void* readBuffer __unused, size_t readSize __unused)
 {
     return 0;
 }

 size_t PalRingBuffer::getFreeSize()
 {

     size_t freeSize = bufferEnd_;
     std::vector<PalRingBufferReader*>::iterator it;

     for (it = readOffsets_.begin(); it != readOffsets_.end(); it++) {
         if ((*(it))->state_ == READER_ENABLED)
             freeSize = std::min(freeSize, bufferEnd_ - (*(it))->unreadSize_);
     }
     return freeSize;
 }

 void PalRingBuffer::updateUnReadSize(size_t writtenSize)
 {
     int32_t i = 0;
     std::vector<PalRingBufferReader*>::iterator it;

     for (it = readOffsets_.begin(); it != readOffsets_.end(); it++, i++) {
         (*(it))->unreadSize_ += writtenSize;
         PAL_VERBOSE(LOG_TAG, "Reader (%d), unreadSize(%zu)", i, (*(it))->unreadSize_);
     }
 }

 void PalRingBuffer::updateIndices(uint32_t startIndice, uint32_t endIndice)
 {
     startIndex = startIndice;
     endIndex = endIndice;
     PAL_VERBOSE(LOG_TAG, "start index = %u, end index = %u", startIndex, endIndex);
 }

 size_t PalRingBuffer::write(void* writeBuffer, size_t writeSize)
 {
     /* update the unread size for each reader*/
     mutex_.lock();
     size_t freeSize = getFreeSize();
     size_t writtenSize = 0;
     int32_t i = 0;
     size_t sizeToCopy = 0;

     PAL_DBG(LOG_TAG, "Enter. freeSize(%zu), writeOffset(%zu)", freeSize, writeOffset_);

     if (writeSize <= freeSize)
         sizeToCopy = writeSize;
     else
         sizeToCopy = freeSize;

     if (sizeToCopy) {
         //buffer wrapped around
         if (writeOffset_ + sizeToCopy > bufferEnd_) {
             i = bufferEnd_ - writeOffset_;

             ar_mem_cpy(buffer_ + writeOffset_, i, writeBuffer, i);
             writtenSize += i;
             sizeToCopy -= writtenSize;
             ar_mem_cpy(buffer_, sizeToCopy, (char*)writeBuffer + writtenSize,
                              sizeToCopy);
             writtenSize += sizeToCopy;
             writeOffset_ = sizeToCopy;
         } else {
             ar_mem_cpy(buffer_ + writeOffset_, sizeToCopy, writeBuffer,
                              sizeToCopy);
             writeOffset_ += sizeToCopy;
             writtenSize = sizeToCopy;
         }
     }
     updateUnReadSize(writtenSize);
     writeOffset_ = writeOffset_ % bufferEnd_;
     PAL_DBG(LOG_TAG, "Exit. writeOffset(%zu)", writeOffset_);
     mutex_.unlock();
     return writtenSize;
 }

 void PalRingBuffer::reset()
 {
     std::vector<PalRingBufferReader*>::iterator it;

     mutex_.lock();
     startIndex = 0;
     endIndex = 0;
     writeOffset_ = 0;
     mutex_.unlock();

     /* Reset all the associated readers */
     for (it = readOffsets_.begin(); it != readOffsets_.end(); it++)
         (*(it))->reset();
 }

 void PalRingBuffer::resizeRingBuffer(size_t bufferSize)
 {
     if (buffer_) {
         delete[] buffer_;
         buffer_ = nullptr;
     }
     buffer_ = (char *)new char[bufferSize];
     bufferEnd_ = bufferSize;
 }

 int32_t PalRingBufferReader::read(void* readBuffer, size_t bufferSize)
 {
     int32_t readSize = 0;

     if (state_ == READER_DISABLED)
         return -EINVAL;

     // Return 0 when no data can be read for current reader
     if (unreadSize_ == 0)
         return 0;

     ringBuffer_->mutex_.lock();

     // when writeOffset leads readOffset
     if (ringBuffer_->writeOffset_ > readOffset_) {
         unreadSize_ = ringBuffer_->writeOffset_ - readOffset_;

         if (bufferSize >= unreadSize_) {
             ar_mem_cpy(readBuffer, unreadSize_, ringBuffer_->buffer_ +
                              readOffset_, unreadSize_);
             readOffset_ += unreadSize_;
             readSize = unreadSize_;
             unreadSize_ = 0;
         } else {
             ar_mem_cpy(readBuffer, unreadSize_, ringBuffer_->buffer_ +
                              readOffset_, bufferSize);
             readOffset_ += bufferSize;
             readSize = bufferSize;
             unreadSize_ = ringBuffer_->writeOffset_ - readOffset_;
         }
     } else {
         //When readOffset leads WriteOffset
         int32_t freeClientSize = bufferSize;
         int32_t i = ringBuffer_->bufferEnd_ - readOffset_;

         if (bufferSize >= i) {
             ar_mem_cpy(readBuffer, i, (char*)(ringBuffer_->buffer_ +
                              readOffset_), i);
             readSize = i;
             freeClientSize -= readSize;
             unreadSize_ = ringBuffer_->writeOffset_;
             readOffset_ = 0;
             //copy remaining unread buffer
             if (freeClientSize > unreadSize_) {
                 ar_mem_cpy((char *)readBuffer + readSize, unreadSize_,
                                  ringBuffer_->buffer_, unreadSize_);
                 readSize += unreadSize_;
                 readOffset_ = unreadSize_;
                 unreadSize_ = 0;
             } else {
                 //copy whatever we can
                 ar_mem_cpy((char *)readBuffer + readSize, freeClientSize,
                                  ringBuffer_->buffer_, freeClientSize);
                 readSize += freeClientSize;
                 readOffset_ = freeClientSize;
                 unreadSize_ = ringBuffer_->writeOffset_ - readOffset_;
             }

         } else {
             ar_mem_cpy(readBuffer, bufferSize, ringBuffer_->buffer_ +
                              readOffset_, bufferSize);
             readSize = bufferSize;
             readOffset_ += bufferSize;
             unreadSize_ = ringBuffer_->bufferEnd_ - readOffset_ +
                           ringBuffer_->writeOffset_;
         }
     }
     ringBuffer_->mutex_.unlock();
     return readSize;
 }

 size_t PalRingBufferReader::advanceReadOffset(size_t advanceSize)
 {
     size_t size_advanced = 0;

     std::lock_guard<std::mutex> lock(ringBuffer_->mutex_);

     /* add code to advance the offset here*/
     if (unreadSize_ < advanceSize) {
         PAL_ERR(LOG_TAG, "Cannot advance read offset %zu greater than unread size %zu",
             advanceSize, unreadSize_);
         return size_advanced;
     }

     unreadSize_ -= advanceSize;
     if (readOffset_ + advanceSize < ringBuffer_->bufferEnd_) {
         readOffset_ += advanceSize;
     } else {
         readOffset_ = readOffset_ + advanceSize - ringBuffer_->bufferEnd_;
     }
     size_advanced += advanceSize;

     return size_advanced;
 }

 void PalRingBufferReader::updateState(pal_ring_buffer_reader_state state)
 {
     PAL_DBG(LOG_TAG, "update reader state to %d", state);
     std::lock_guard<std::mutex> lock(ringBuffer_->mutex_);

     if (state_ == READER_DISABLED && state == READER_ENABLED) {
         if (unreadSize_ > ringBuffer_->bufferEnd_)
            unreadSize_ = ringBuffer_->bufferEnd_;

         if (unreadSize_ <= ringBuffer_->writeOffset_) {
             readOffset_ = ringBuffer_->writeOffset_ - unreadSize_;
         } else {
             readOffset_ = ringBuffer_->writeOffset_ +
                 ringBuffer_->bufferEnd_ - unreadSize_;
         }
     }
     state_ = state;
 }

 void PalRingBufferReader::getIndices(uint32_t *startIndice, uint32_t *endIndice)
 {
     *startIndice = ringBuffer_->startIndex;
     *endIndice = ringBuffer_->endIndex;
     PAL_VERBOSE(LOG_TAG, "start index = %u, end index = %u",
                 ringBuffer_->startIndex, ringBuffer_->endIndex);
 }

 size_t PalRingBufferReader::getUnreadSize()
 {
     PAL_VERBOSE(LOG_TAG, "unread size %zu", unreadSize_);
     return unreadSize_;
 }

 void PalRingBufferReader::reset()
 {
     ringBuffer_->mutex_.lock();
     readOffset_ = 0;
     unreadSize_ = 0;
     state_ = READER_DISABLED;
     ringBuffer_->mutex_.unlock();
 }

 PalRingBufferReader* PalRingBuffer::newReader()
 {
     PalRingBufferReader* readOffset =
                   new PalRingBufferReader(this);
     readOffsets_.push_back(readOffset);
     return readOffset;
 }
	/*
	* Copyright (c) 2019-2021, The Linux Foundation. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are
	* met:
	* * Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* * Redistributions in binary form must reproduce the above
	* copyright notice, this list of conditions and the following
	* disclaimer in the documentation and/or other materials provided
	* with the distribution.
	* * Neither the name of The Linux Foundation nor the names of its
	* contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
	* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
	* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
	* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
	* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/


	#ifdef LINUX_ENABLED
	#include <algorithm>
	#endif
	#include "PalRingBuffer.h"
	#include "PalCommon.h"
	#define LOG_TAG "PAL: PalRingBuffer"

	int32_t PalRingBuffer::removeReader(PalRingBufferReader *reader)
	{
	auto iter = std::find(readOffsets_.begin(), readOffsets_.end(), reader);
	if (iter != readOffsets_.end())
	readOffsets_.erase(iter);

	return 0;
	}

	size_t PalRingBuffer::read(std::shared_ptr<PalRingBufferReader>reader __unused,
	void* readBuffer __unused, size_t readSize __unused)
	{
	return 0;
	}

	size_t PalRingBuffer::getFreeSize()
	{

	size_t freeSize = bufferEnd_;
	std::vector<PalRingBufferReader*>::iterator it;

	for (it = readOffsets_.begin(); it != readOffsets_.end(); it++) {
	if ((*(it))->state_ == READER_ENABLED)
	freeSize = std::min(freeSize, bufferEnd_ - (*(it))->unreadSize_);
	}
	return freeSize;
	}

	void PalRingBuffer::updateUnReadSize(size_t writtenSize)
	{
	int32_t i = 0;
	std::vector<PalRingBufferReader*>::iterator it;

	for (it = readOffsets_.begin(); it != readOffsets_.end(); it++, i++) {
	(*(it))->unreadSize_ += writtenSize;
	PAL_VERBOSE(LOG_TAG, "Reader (%d), unreadSize(%zu)", i, (*(it))->unreadSize_);
	}
	}

	void PalRingBuffer::updateIndices(uint32_t startIndice, uint32_t endIndice)
	{
	startIndex = startIndice;
	endIndex = endIndice;
	PAL_VERBOSE(LOG_TAG, "start index = %u, end index = %u", startIndex, endIndex);
	}

	size_t PalRingBuffer::write(void* writeBuffer, size_t writeSize)
	{
	/* update the unread size for each reader*/
	mutex_.lock();
	size_t freeSize = getFreeSize();
	size_t writtenSize = 0;
	int32_t i = 0;
	size_t sizeToCopy = 0;

	PAL_DBG(LOG_TAG, "Enter. freeSize(%zu), writeOffset(%zu)", freeSize, writeOffset_);

	if (writeSize <= freeSize)
	sizeToCopy = writeSize;
	else
	sizeToCopy = freeSize;

	if (sizeToCopy) {
	//buffer wrapped around
	if (writeOffset_ + sizeToCopy > bufferEnd_) {
	i = bufferEnd_ - writeOffset_;

	ar_mem_cpy(buffer_ + writeOffset_, i, writeBuffer, i);
	writtenSize += i;
	sizeToCopy -= writtenSize;
	ar_mem_cpy(buffer_, sizeToCopy, (char*)writeBuffer + writtenSize,
	sizeToCopy);
	writtenSize += sizeToCopy;
	writeOffset_ = sizeToCopy;
	} else {
	ar_mem_cpy(buffer_ + writeOffset_, sizeToCopy, writeBuffer,
	sizeToCopy);
	writeOffset_ += sizeToCopy;
	writtenSize = sizeToCopy;
	}
	}
	updateUnReadSize(writtenSize);
	writeOffset_ = writeOffset_ % bufferEnd_;
	PAL_DBG(LOG_TAG, "Exit. writeOffset(%zu)", writeOffset_);
	mutex_.unlock();
	return writtenSize;
	}

	void PalRingBuffer::reset()
	{
	std::vector<PalRingBufferReader*>::iterator it;

	mutex_.lock();
	startIndex = 0;
	endIndex = 0;
	writeOffset_ = 0;
	mutex_.unlock();

	/* Reset all the associated readers */
	for (it = readOffsets_.begin(); it != readOffsets_.end(); it++)
	(*(it))->reset();
	}

	void PalRingBuffer::resizeRingBuffer(size_t bufferSize)
	{
	if (buffer_) {
	delete[] buffer_;
	buffer_ = nullptr;
	}
	buffer_ = (char *)new char[bufferSize];
	bufferEnd_ = bufferSize;
	}

	int32_t PalRingBufferReader::read(void* readBuffer, size_t bufferSize)
	{
	int32_t readSize = 0;

	if (state_ == READER_DISABLED)
	return -EINVAL;

	// Return 0 when no data can be read for current reader
	if (unreadSize_ == 0)
	return 0;

	ringBuffer_->mutex_.lock();

	// when writeOffset leads readOffset
	if (ringBuffer_->writeOffset_ > readOffset_) {
	unreadSize_ = ringBuffer_->writeOffset_ - readOffset_;

	if (bufferSize >= unreadSize_) {
	ar_mem_cpy(readBuffer, unreadSize_, ringBuffer_->buffer_ +
	readOffset_, unreadSize_);
	readOffset_ += unreadSize_;
	readSize = unreadSize_;
	unreadSize_ = 0;
	} else {
	ar_mem_cpy(readBuffer, unreadSize_, ringBuffer_->buffer_ +
	readOffset_, bufferSize);
	readOffset_ += bufferSize;
	readSize = bufferSize;
	unreadSize_ = ringBuffer_->writeOffset_ - readOffset_;
	}
	} else {
	//When readOffset leads WriteOffset
	int32_t freeClientSize = bufferSize;
	int32_t i = ringBuffer_->bufferEnd_ - readOffset_;

	if (bufferSize >= i) {
	ar_mem_cpy(readBuffer, i, (char*)(ringBuffer_->buffer_ +
	readOffset_), i);
	readSize = i;
	freeClientSize -= readSize;
	unreadSize_ = ringBuffer_->writeOffset_;
	readOffset_ = 0;
	//copy remaining unread buffer
	if (freeClientSize > unreadSize_) {
	ar_mem_cpy((char *)readBuffer + readSize, unreadSize_,
	ringBuffer_->buffer_, unreadSize_);
	readSize += unreadSize_;
	readOffset_ = unreadSize_;
	unreadSize_ = 0;
	} else {
	//copy whatever we can
	ar_mem_cpy((char *)readBuffer + readSize, freeClientSize,
	ringBuffer_->buffer_, freeClientSize);
	readSize += freeClientSize;
	readOffset_ = freeClientSize;
	unreadSize_ = ringBuffer_->writeOffset_ - readOffset_;
	}

	} else {
	ar_mem_cpy(readBuffer, bufferSize, ringBuffer_->buffer_ +
	readOffset_, bufferSize);
	readSize = bufferSize;
	readOffset_ += bufferSize;
	unreadSize_ = ringBuffer_->bufferEnd_ - readOffset_ +
	ringBuffer_->writeOffset_;
	}
	}
	ringBuffer_->mutex_.unlock();
	return readSize;
	}

	size_t PalRingBufferReader::advanceReadOffset(size_t advanceSize)
	{
	size_t size_advanced = 0;

	std::lock_guard<std::mutex> lock(ringBuffer_->mutex_);

	/* add code to advance the offset here*/
	if (unreadSize_ < advanceSize) {
	PAL_ERR(LOG_TAG, "Cannot advance read offset %zu greater than unread size %zu",
	advanceSize, unreadSize_);
	return size_advanced;
	}

	unreadSize_ -= advanceSize;
	if (readOffset_ + advanceSize < ringBuffer_->bufferEnd_) {
	readOffset_ += advanceSize;
	} else {
	readOffset_ = readOffset_ + advanceSize - ringBuffer_->bufferEnd_;
	}
	size_advanced += advanceSize;

	return size_advanced;
	}

	void PalRingBufferReader::updateState(pal_ring_buffer_reader_state state)
	{
	PAL_DBG(LOG_TAG, "update reader state to %d", state);
	std::lock_guard<std::mutex> lock(ringBuffer_->mutex_);

	if (state_ == READER_DISABLED && state == READER_ENABLED) {
	if (unreadSize_ > ringBuffer_->bufferEnd_)
	unreadSize_ = ringBuffer_->bufferEnd_;

	if (unreadSize_ <= ringBuffer_->writeOffset_) {
	readOffset_ = ringBuffer_->writeOffset_ - unreadSize_;
	} else {
	readOffset_ = ringBuffer_->writeOffset_ +
	ringBuffer_->bufferEnd_ - unreadSize_;
	}
	}
	state_ = state;
	}

	void PalRingBufferReader::getIndices(uint32_t startIndice, uint32_t endIndice)
	{
	*startIndice = ringBuffer_->startIndex;
	*endIndice = ringBuffer_->endIndex;
	PAL_VERBOSE(LOG_TAG, "start index = %u, end index = %u",
	ringBuffer_->startIndex, ringBuffer_->endIndex);
	}

	size_t PalRingBufferReader::getUnreadSize()
	{
	PAL_VERBOSE(LOG_TAG, "unread size %zu", unreadSize_);
	return unreadSize_;
	}

	void PalRingBufferReader::reset()
	{
	ringBuffer_->mutex_.lock();
	readOffset_ = 0;
	unreadSize_ = 0;
	state_ = READER_DISABLED;
	ringBuffer_->mutex_.unlock();
	}

	PalRingBufferReader* PalRingBuffer::newReader()
	{
	PalRingBufferReader* readOffset =
	new PalRingBufferReader(this);
	readOffsets_.push_back(readOffset);
	return readOffset;
	}