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{
    "id": 26272,
    "url": "https://patchwork.libcamera.org/api/1.1/patches/26272/?format=api",
    "web_url": "https://patchwork.libcamera.org/patch/26272/",
    "project": {
        "id": 1,
        "url": "https://patchwork.libcamera.org/api/1.1/projects/1/?format=api",
        "name": "libcamera",
        "link_name": "libcamera",
        "list_id": "libcamera_core",
        "list_email": "libcamera-devel@lists.libcamera.org",
        "web_url": "",
        "scm_url": "",
        "webscm_url": ""
    },
    "msgid": "<20260310120106.79922-4-johannes.goede@oss.qualcomm.com>",
    "date": "2026-03-10T12:01:04",
    "name": "[v7,3/5] software_isp: debayer_cpu: Add multi-threading support",
    "commit_ref": null,
    "pull_url": null,
    "state": "accepted",
    "archived": false,
    "hash": "a2e2a4f7885ba32961bd84a94ffb96b1cab496de",
    "submitter": {
        "id": 242,
        "url": "https://patchwork.libcamera.org/api/1.1/people/242/?format=api",
        "name": "Hans de Goede",
        "email": "johannes.goede@oss.qualcomm.com"
    },
    "delegate": null,
    "mbox": "https://patchwork.libcamera.org/patch/26272/mbox/",
    "series": [
        {
            "id": 5825,
            "url": "https://patchwork.libcamera.org/api/1.1/series/5825/?format=api",
            "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=5825",
            "date": "2026-03-10T12:01:01",
            "name": "software_isp: debayer_cpu: Add multi-threading support",
            "version": 7,
            "mbox": "https://patchwork.libcamera.org/series/5825/mbox/"
        }
    ],
    "comments": "https://patchwork.libcamera.org/api/patches/26272/comments/",
    "check": "pending",
    "checks": "https://patchwork.libcamera.org/api/patches/26272/checks/",
    "tags": {},
    "headers": {
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        ],
        "From": "Hans de Goede <johannes.goede@oss.qualcomm.com>",
        "To": "libcamera-devel@lists.libcamera.org",
        "Cc": "Milan Zamazal <mzamazal@redhat.com>, Hans de Goede\n\t<johannes.goede@oss.qualcomm.com>, =?utf-8?q?Barnab=C3=A1s_P=C5=91cze?=\n\t<barnabas.pocze@ideasonboard.com>",
        "Subject": "[PATCH v7 3/5] software_isp: debayer_cpu: Add multi-threading\n\tsupport",
        "Date": "Tue, 10 Mar 2026 13:01:04 +0100",
        "Message-ID": "<20260310120106.79922-4-johannes.goede@oss.qualcomm.com>",
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        "References": "<20260310120106.79922-1-johannes.goede@oss.qualcomm.com>",
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    },
    "content": "Add CPU soft ISP multi-threading support.\n\nBenchmark results for the Arduino Uno-Q with a weak CPU which is good for\nperformance testing, all numbers with an IMX219 running at\n3280x2464 -> 3272x2464:\n\n1 thread : 147ms / frame, ~6.5 fps\n2 threads:  80ms / frame, ~12.5 fps\n3 threads:  65ms / frame, ~15 fps\n\nAdding a 4th thread does not improve performance.\n\nTested-by: Barnabás Pőcze <barnabas.pocze@ideasonboard.com> # ThinkPad X1 Yoga Gen 7 + ov2740\nReviewed-by: Milan Zamazal <mzamazal@redhat.com>\nSigned-off-by: Hans de Goede <johannes.goede@oss.qualcomm.com>\n---\nChanges in v7:\n- Add Debug message logging thread count\n\nChanges in v5:\n- Extend software_isp.threads docs in runtime_configuration.rst\n\nChanges in v4:\n- Document software_isp.threads option in runtime_configuration.rst\n- Add an use constants for min/max/default number of threads\n\nChanges in v3:\n- Adjust for DebayerCpuThread now inheriting from Thread\n- Use for (auto &thread : threads_)\n\nChanges in v2:\n- Adjust to use the new DebayerCpuThread class introduced in the v2 patch-series\n- Re-use threads instead of starting new threads every frame\n---\n Documentation/runtime_configuration.rst    |  8 ++++\n src/libcamera/software_isp/debayer_cpu.cpp | 47 ++++++++++++++++++++--\n src/libcamera/software_isp/debayer_cpu.h   | 10 +++++\n 3 files changed, 62 insertions(+), 3 deletions(-)",
    "diff": "diff --git a/Documentation/runtime_configuration.rst b/Documentation/runtime_configuration.rst\nindex e99ef2fb9..651929a4d 100644\n--- a/Documentation/runtime_configuration.rst\n+++ b/Documentation/runtime_configuration.rst\n@@ -51,6 +51,7 @@ file structure:\n       measure:\n         skip: # non-negative integer, frames to skip initially\n         number: # non-negative integer, frames to measure\n+      threads: # integer >= 1, number of render threads to use, default 2\n \n Configuration file example\n --------------------------\n@@ -84,6 +85,7 @@ Configuration file example\n        measure:\n          skip: 50\n          number: 30\n+       threads: 2\n \n List of variables and configuration options\n -------------------------------------------\n@@ -167,6 +169,12 @@ software_isp.measure.skip, software_isp.measure.number\n \n    Example `number` value: ``30``\n \n+software_isp.threads\n+   Number of render threads the software ISP uses when using the CPU.\n+   This must be between 1 and 8 and the default is 2.\n+\n+   Example value: ``2``\n+\n Further details\n ---------------\n \ndiff --git a/src/libcamera/software_isp/debayer_cpu.cpp b/src/libcamera/software_isp/debayer_cpu.cpp\nindex fc3305d2e..1de70b3b7 100644\n--- a/src/libcamera/software_isp/debayer_cpu.cpp\n+++ b/src/libcamera/software_isp/debayer_cpu.cpp\n@@ -76,6 +76,7 @@ DebayerCpuThread::DebayerCpuThread(DebayerCpu *debayer, unsigned int threadIndex\n \t  debayer_(debayer), threadIndex_(threadIndex),\n \t  enableInputMemcpy_(enableInputMemcpy)\n {\n+\tmoveToThread(this);\n }\n \n /**\n@@ -107,11 +108,15 @@ DebayerCpu::DebayerCpu(std::unique_ptr<SwStatsCpu> stats, const GlobalConfigurat\n \tbool enableInputMemcpy =\n \t\tconfiguration.option<bool>({ \"software_isp\", \"copy_input_buffer\" }).value_or(true);\n \n-\t/* Just one thread object for now, which will be called inline rather than async */\n-\tthreads_.resize(1);\n+\tunsigned int threadCount =\n+\t\tconfiguration.option<unsigned int>({ \"software_isp\", \"threads\" }).value_or(kDefaultThreads);\n+\tthreadCount = std::clamp(threadCount, kMinThreads, kMaxThreads);\n+\tthreads_.resize(threadCount);\n \n \tfor (unsigned int i = 0; i < threads_.size(); i++)\n \t\tthreads_[i] = std::make_unique<DebayerCpuThread>(this, i, enableInputMemcpy);\n+\n+\tLOG(Debayer, Debug) << \"Thread count \" << threadCount;\n }\n \n DebayerCpu::~DebayerCpu() = default;\n@@ -746,6 +751,11 @@ void DebayerCpuThread::process(uint32_t frame, const uint8_t *src, uint8_t *dst)\n \t\tprocess2(frame, src, dst);\n \telse\n \t\tprocess4(frame, src, dst);\n+\n+\tdebayer_->workPendingMutex_.lock();\n+\tdebayer_->workPending_ &= ~(1 << threadIndex_);\n+\tdebayer_->workPendingMutex_.unlock();\n+\tdebayer_->workPendingCv_.notify_one();\n }\n \n void DebayerCpuThread::process2(uint32_t frame, const uint8_t *src, uint8_t *dst)\n@@ -985,7 +995,21 @@ void DebayerCpu::process(uint32_t frame, FrameBuffer *input, FrameBuffer *output\n \n \tstats_->startFrame(frame);\n \n-\tthreads_[0]->process(frame, in.planes()[0].data(), out.planes()[0].data());\n+\tworkPendingMutex_.lock();\n+\tworkPending_ = (1 << threads_.size()) - 1;\n+\tworkPendingMutex_.unlock();\n+\n+\tfor (auto &thread : threads_)\n+\t\tthread->invokeMethod(&DebayerCpuThread::process,\n+\t\t\t\t     ConnectionTypeQueued, frame,\n+\t\t\t\t     in.planes()[0].data(), out.planes()[0].data());\n+\n+\t{\n+\t\tMutexLocker locker(workPendingMutex_);\n+\t\tworkPendingCv_.wait(locker, [&]() LIBCAMERA_TSA_REQUIRES(workPendingMutex_) {\n+\t\t\treturn workPending_ == 0;\n+\t\t});\n+\t}\n \n \tmetadata.planes()[0].bytesused = out.planes()[0].size();\n \n@@ -1004,6 +1028,23 @@ void DebayerCpu::process(uint32_t frame, FrameBuffer *input, FrameBuffer *output\n \tinputBufferReady.emit(input);\n }\n \n+int DebayerCpu::start()\n+{\n+\tfor (auto &thread : threads_)\n+\t\tthread->start();\n+\n+\treturn 0;\n+}\n+\n+void DebayerCpu::stop()\n+{\n+\tfor (auto &thread : threads_)\n+\t\tthread->exit();\n+\n+\tfor (auto &thread : threads_)\n+\t\tthread->wait();\n+}\n+\n SizeRange DebayerCpu::sizes(PixelFormat inputFormat, const Size &inputSize)\n {\n \tSize patternSize = this->patternSize(inputFormat);\ndiff --git a/src/libcamera/software_isp/debayer_cpu.h b/src/libcamera/software_isp/debayer_cpu.h\nindex 8e57c273b..a96998e92 100644\n--- a/src/libcamera/software_isp/debayer_cpu.h\n+++ b/src/libcamera/software_isp/debayer_cpu.h\n@@ -16,6 +16,7 @@\n #include <vector>\n \n #include <libcamera/base/object.h>\n+#include <libcamera/base/mutex.h>\n \n #include \"libcamera/internal/bayer_format.h\"\n #include \"libcamera/internal/global_configuration.h\"\n@@ -41,6 +42,8 @@ public:\n \tstd::tuple<unsigned int, unsigned int>\n \tstrideAndFrameSize(const PixelFormat &outputFormat, const Size &size);\n \tvoid process(uint32_t frame, FrameBuffer *input, FrameBuffer *output, const DebayerParams &params);\n+\tint start();\n+\tvoid stop();\n \tSizeRange sizes(PixelFormat inputFormat, const Size &inputSize);\n \tconst SharedFD &getStatsFD() { return stats_->getStatsFD(); }\n \n@@ -144,6 +147,13 @@ private:\n \tstd::unique_ptr<SwStatsCpu> stats_;\n \tunsigned int xShift_; /* Offset of 0/1 applied to window_.x */\n \n+\tstatic constexpr unsigned int kMinThreads = 1;\n+\tstatic constexpr unsigned int kMaxThreads = 8;\n+\tstatic constexpr unsigned int kDefaultThreads = 2;\n+\n+\tunsigned int workPending_ LIBCAMERA_TSA_GUARDED_BY(workPendingMutex_);\n+\tMutex workPendingMutex_;\n+\tConditionVariable workPendingCv_;\n \tstd::vector<std::unique_ptr<DebayerCpuThread>> threads_;\n };\n \n",
    "prefixes": [
        "v7",
        "3/5"
    ]
}