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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (C) 2020, Google Inc.
*
* Test the buffer cache different operation modes
*/
#include <iostream>
#include <random>
#include <vector>
#include <libcamera/stream.h>
#include "buffer_source.h"
#include "test.h"
using namespace libcamera;
namespace {
class BufferCacheTest : public Test
{
public:
/*
* Test that a cache with the same size as there are buffers results in
* a sequential run over; 0, 1, 2, 3, 4, 0, 1, 2, 3, 4, ...
*
* The test is only valid when the cache size is as least as big as the
* number of buffers.
*/
int testSequential(V4L2BufferCache *cache,
const std::vector<std::unique_ptr<FrameBuffer>> &buffers)
{
for (unsigned int i = 0; i < buffers.size() * 100; i++) {
int nBuffer = i % buffers.size();
int index = cache->get(*buffers[nBuffer].get());
if (index != nBuffer) {
std::cout << "Expected index " << nBuffer
<< " got " << index << std::endl;
return TestFail;
}
cache->put(index);
}
return TestPass;
}
/*
* Test that randomly putting buffers to the cache always results in a
* valid index.
*/
int testRandom(V4L2BufferCache *cache,
const std::vector<std::unique_ptr<FrameBuffer>> &buffers)
{
std::uniform_int_distribution<> dist(0, buffers.size() - 1);
for (unsigned int i = 0; i < buffers.size() * 100; i++) {
int nBuffer = dist(generator_);
int index = cache->get(*buffers[nBuffer].get());
if (index < 0) {
std::cout << "Failed lookup from cache"
<< std::endl;
return TestFail;
}
cache->put(index);
}
return TestPass;
}
/*
* Test that using a buffer more frequently keeps it hot in the cache at
* all times.
*/
int testHot(V4L2BufferCache *cache,
const std::vector<std::unique_ptr<FrameBuffer>> &buffers,
unsigned int hotFrequency)
{
/* Run the random test on the cache to make it messy. */
if (testRandom(cache, buffers) != TestPass)
return TestFail;
std::uniform_int_distribution<> dist(0, buffers.size() - 1);
/* Pick a hot buffer at random and store its index. */
int hotBuffer = dist(generator_);
int hotIndex = cache->get(*buffers[hotBuffer].get());
cache->put(hotIndex);
/*
* Queue hot buffer at the requested frequency and make sure
* it stays hot.
*/
for (unsigned int i = 0; i < buffers.size() * 100; i++) {
int nBuffer, index;
bool hotQueue = i % hotFrequency == 0;
if (hotQueue)
nBuffer = hotBuffer;
else
nBuffer = dist(generator_);
index = cache->get(*buffers[nBuffer].get());
if (index < 0) {
std::cout << "Failed lookup from cache"
<< std::endl;
return TestFail;
}
if (hotQueue && index != hotIndex) {
std::cout << "Hot buffer got cold"
<< std::endl;
return TestFail;
}
cache->put(index);
}
return TestPass;
}
int init() override
{
std::random_device rd;
unsigned int seed = rd();
std::cout << "Random seed is " << seed << std::endl;
generator_.seed(seed);
return TestPass;
}
int run() override
{
const unsigned int numBuffers = 8;
StreamConfiguration cfg;
cfg.pixelFormat = DRM_FORMAT_YUYV;
cfg.size = Size(600, 800);
cfg.bufferCount = numBuffers;
BufferSource source;
int ret = source.allocate(cfg);
if (ret != TestPass)
return ret;
const std::vector<std::unique_ptr<FrameBuffer>> &buffers =
source.buffers();
if (buffers.size() != numBuffers) {
std::cout << "Got " << buffers.size()
<< " buffers, expected " << numBuffers
<< std::endl;
return TestFail;
}
/*
* Test cache of same size as there are buffers, the cache is
* created from a list of buffers and will be pre-populated.
*/
V4L2BufferCache cacheFromBuffers(buffers);
if (testSequential(&cacheFromBuffers, buffers) != TestPass)
return TestFail;
if (testRandom(&cacheFromBuffers, buffers) != TestPass)
return TestFail;
if (testHot(&cacheFromBuffers, buffers, numBuffers) != TestPass)
return TestFail;
/*
* Test cache of same size as there are buffers, the cache is
* not pre-populated.
*/
V4L2BufferCache cacheFromNumbers(numBuffers);
if (testSequential(&cacheFromNumbers, buffers) != TestPass)
return TestFail;
if (testRandom(&cacheFromNumbers, buffers) != TestPass)
return TestFail;
if (testHot(&cacheFromNumbers, buffers, numBuffers) != TestPass)
return TestFail;
/*
* Test cache half the size of number of buffers used, the cache
* is not pre-populated.
*/
V4L2BufferCache cacheHalf(numBuffers / 2);
if (testRandom(&cacheHalf, buffers) != TestPass)
return TestFail;
if (testHot(&cacheHalf, buffers, numBuffers / 2) != TestPass)
return TestFail;
return TestPass;
}
private:
std::mt19937 generator_;
};
} /* namespace */
TEST_REGISTER(BufferCacheTest);
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