From bcaed97380a8970f82e932dc37c7c20ceca36a56 Mon Sep 17 00:00:00 2001 From: Laurent Pinchart Date: Mon, 20 Oct 2025 19:03:17 +0300 Subject: [PATCH] test: ipa: ipa_interface: Replace FIFO with pipe MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The ipa_interface unit test uses a FIFO to communicate with the vimc IPA module. FIFOs are named pipes, created in the file system. The path to the FIFO is hardcoded so that both the unit test and IPA module know where to locate the file. If the ipa_interface crashes for any reason, the FIFO will not be removed, and subsequent usage of the vimc IPA module will hang when trying to write to the FIFO in the IPA module. Fix this by replacing the FIFO with a pipe. Pipes are unidirectional data channels that are represented by a pair of file descriptors, without any presence in the file system. The write end of the pipe is passed to the vimc IPA module init() function, and then used the same way as the FIFO. While at it, use a std::unique_ptr to manage the notifier in the unit test instead of manually allocating and deleting the object. Signed-off-by: Laurent Pinchart Reviewed-by: Barnabás Pőcze Reviewed-by: Isaac Scott --- include/libcamera/ipa/vimc.mojom | 3 +- src/ipa/vimc/vimc.cpp | 33 ++++--------------- src/libcamera/pipeline/vimc/vimc.cpp | 2 +- test/ipa/ipa_interface_test.cpp | 49 +++++++++++----------------- 4 files changed, 28 insertions(+), 59 deletions(-) diff --git a/include/libcamera/ipa/vimc.mojom b/include/libcamera/ipa/vimc.mojom index c5c5fe83..b1bee05a 100644 --- a/include/libcamera/ipa/vimc.mojom +++ b/include/libcamera/ipa/vimc.mojom @@ -8,8 +8,6 @@ module ipa.vimc; import "include/libcamera/ipa/core.mojom"; -const string VimcIPAFIFOPath = "/tmp/libcamera_ipa_vimc_fifo"; - enum IPAOperationCode { IPAOperationNone, IPAOperationInit, @@ -26,6 +24,7 @@ enum IPAOperationCode { interface IPAVimcInterface { init(libcamera.IPASettings settings, + libcamera.SharedFD traceFd, IPAOperationCode code, [flags] TestFlag inFlags) => (int32 ret, [flags] TestFlag outFlags); diff --git a/src/ipa/vimc/vimc.cpp b/src/ipa/vimc/vimc.cpp index a1351a0f..4162b848 100644 --- a/src/ipa/vimc/vimc.cpp +++ b/src/ipa/vimc/vimc.cpp @@ -33,6 +33,7 @@ public: ~IPAVimc(); int init(const IPASettings &settings, + const SharedFD &traceFd, const ipa::vimc::IPAOperationCode code, const Flags inFlags, Flags *outFlags) override; @@ -51,30 +52,28 @@ public: void computeParams(uint32_t frame, uint32_t bufferId) override; private: - void initTrace(); void trace(enum ipa::vimc::IPAOperationCode operation); - int fd_; + SharedFD fd_; std::map buffers_; }; IPAVimc::IPAVimc() - : fd_(-1) { - initTrace(); } IPAVimc::~IPAVimc() { - if (fd_ != -1) - ::close(fd_); } int IPAVimc::init(const IPASettings &settings, + const SharedFD &traceFd, const ipa::vimc::IPAOperationCode code, const Flags inFlags, Flags *outFlags) { + fd_ = traceFd; + trace(ipa::vimc::IPAOperationInit); LOG(IPAVimc, Debug) @@ -162,30 +161,12 @@ void IPAVimc::computeParams([[maybe_unused]] uint32_t frame, uint32_t bufferId) paramsComputed.emit(bufferId, flags); } -void IPAVimc::initTrace() -{ - struct stat fifoStat; - int ret = stat(ipa::vimc::VimcIPAFIFOPath.c_str(), &fifoStat); - if (ret) - return; - - ret = ::open(ipa::vimc::VimcIPAFIFOPath.c_str(), O_WRONLY | O_CLOEXEC); - if (ret < 0) { - ret = errno; - LOG(IPAVimc, Error) << "Failed to open vimc IPA test FIFO: " - << strerror(ret); - return; - } - - fd_ = ret; -} - void IPAVimc::trace(enum ipa::vimc::IPAOperationCode operation) { - if (fd_ < 0) + if (!fd_.isValid()) return; - int ret = ::write(fd_, &operation, sizeof(operation)); + int ret = ::write(fd_.get(), &operation, sizeof(operation)); if (ret < 0) { ret = errno; LOG(IPAVimc, Error) << "Failed to write to vimc IPA test FIFO: " diff --git a/src/libcamera/pipeline/vimc/vimc.cpp b/src/libcamera/pipeline/vimc/vimc.cpp index e915d5c2..6681c74e 100644 --- a/src/libcamera/pipeline/vimc/vimc.cpp +++ b/src/libcamera/pipeline/vimc/vimc.cpp @@ -498,7 +498,7 @@ bool PipelineHandlerVimc::match(DeviceEnumerator *enumerator) std::string conf = data->ipa_->configurationFile("vimc.conf"); Flags inFlags = ipa::vimc::TestFlag::Flag2; Flags outFlags; - data->ipa_->init(IPASettings{ conf, data->sensor_->model() }, + data->ipa_->init(IPASettings{ conf, data->sensor_->model() }, SharedFD{}, ipa::vimc::IPAOperationInit, inFlags, &outFlags); LOG(VIMC, Debug) diff --git a/test/ipa/ipa_interface_test.cpp b/test/ipa/ipa_interface_test.cpp index 41ef8172..c1fe2267 100644 --- a/test/ipa/ipa_interface_test.cpp +++ b/test/ipa/ipa_interface_test.cpp @@ -7,9 +7,8 @@ #include #include +#include #include -#include -#include #include #include @@ -17,8 +16,10 @@ #include #include #include +#include #include #include +#include #include "libcamera/internal/camera_manager.h" #include "libcamera/internal/device_enumerator.h" @@ -37,13 +38,13 @@ class IPAInterfaceTest : public Test, public Object { public: IPAInterfaceTest() - : trace_(ipa::vimc::IPAOperationNone), notifier_(nullptr), fd_(-1) + : trace_(ipa::vimc::IPAOperationNone) { } ~IPAInterfaceTest() { - delete notifier_; + notifier_.reset(); ipa_.reset(); ipaManager_.reset(); config_.reset(); @@ -70,28 +71,22 @@ protected: return TestPass; } - /* Create and open the communication FIFO. */ - int ret = mkfifo(ipa::vimc::VimcIPAFIFOPath.c_str(), S_IRUSR | S_IWUSR); + /* Create the communication pipe. */ + int pipefds[2]; + int ret = pipe2(pipefds, O_NONBLOCK); if (ret) { ret = errno; - cerr << "Failed to create IPA test FIFO at '" - << ipa::vimc::VimcIPAFIFOPath << "': " << strerror(ret) + cerr << "Failed to create IPA test pipe: " << strerror(ret) << endl; return TestFail; } - ret = open(ipa::vimc::VimcIPAFIFOPath.c_str(), O_RDONLY | O_NONBLOCK); - if (ret < 0) { - ret = errno; - cerr << "Failed to open IPA test FIFO at '" - << ipa::vimc::VimcIPAFIFOPath << "': " << strerror(ret) - << endl; - unlink(ipa::vimc::VimcIPAFIFOPath.c_str()); - return TestFail; - } - fd_ = ret; + pipeReadFd_ = UniqueFD(pipefds[0]); + pipeWriteFd_ = SharedFD(pipefds[1]); - notifier_ = new EventNotifier(fd_, EventNotifier::Read, this); + notifier_ = std::make_unique(pipeReadFd_.get(), + EventNotifier::Read, + this); notifier_->activated.connect(this, &IPAInterfaceTest::readTrace); /* Create the IPA manager. */ @@ -116,7 +111,7 @@ protected: std::string conf = ipa_->configurationFile("vimc.conf"); Flags inFlags; Flags outFlags; - int ret = ipa_->init(IPASettings{ conf, "vimc" }, + int ret = ipa_->init(IPASettings{ conf, "vimc" }, pipeWriteFd_, ipa::vimc::IPAOperationInit, inFlags, &outFlags); if (ret < 0) { @@ -159,20 +154,13 @@ protected: return TestPass; } - void cleanup() override - { - close(fd_); - unlink(ipa::vimc::VimcIPAFIFOPath.c_str()); - } - private: void readTrace() { ssize_t s = read(notifier_->fd(), &trace_, sizeof(trace_)); if (s < 0) { int ret = errno; - cerr << "Failed to read from IPA test FIFO at '" - << ipa::vimc::VimcIPAFIFOPath << "': " << strerror(ret) + cerr << "Failed to read from IPA test pipe: " << strerror(ret) << endl; trace_ = ipa::vimc::IPAOperationNone; } @@ -184,8 +172,9 @@ private: std::unique_ptr config_; std::unique_ptr ipaManager_; enum ipa::vimc::IPAOperationCode trace_; - EventNotifier *notifier_; - int fd_; + std::unique_ptr notifier_; + UniqueFD pipeReadFd_; + SharedFD pipeWriteFd_; }; TEST_REGISTER(IPAInterfaceTest)