[{"id":38943,"web_url":"https://patchwork.libcamera.org/comment/38943/","msgid":"<8e547ab9-5649-48e0-b4f6-cab2df95650f@oss.qualcomm.com>","date":"2026-05-21T18:49:49","subject":"Re: [PATCH v5 1/4] libcamera: Create IPA by name","submitter":{"id":242,"url":"https://patchwork.libcamera.org/api/people/242/","name":"Hans de Goede","email":"johannes.goede@oss.qualcomm.com"},"content":"Hi,\n\nOn 12-May-26 19:53, Hans de Goede wrote:\n> Currently createIPA() / IPAManager::module() assume that there is a 1:1\n> relationship between pipeline handlers and IPAs and IPA matching is done\n> based on matching the pipe to ipaModuleInfo.pipelineName[].\n> \n> One way to allow using a single IPA with multiple pipelines would be to\n> allow the IPA to declare itself compatible with more than one pipeline,\n> turning ipaModuleInfo.pipelineName[] into e.g. a vector. But the way\n> ipaModuleInfo is loaded as an ELF symbol requires it to be a simple flat\n> C-struct.\n> \n> Instead, move the IPA creation procedure to be name-based, introducing\n> a PipelineHandler::createIPA(name, minVer, maxVer) overload that allows\n> to specify the name of the IPA module to match. Pipeline handlers that\n> wants to use their name as matching criteria can continue doing so using\n> the already existing PipelineHandler::createIPA(minVer, maxVer) overload.\n> \n> Signed-off-by: Jacopo Mondi \n> Reviewed-by: Kieran Bingham \n> Tested-by: Niklas Söderlund \n> Signed-off-by: Hans de Goede \n\nWhile building a modified deb package with these patches added,\nI learned that this patch breaks building the tests which the deb\nbuild has enabled by default.\n\nTo fix the tests the following change needs to be squashed in:\n\n--- a/test/ipa/ipa_interface_test.cpp\n+++ b/test/ipa/ipa_interface_test.cpp\n@@ -99,7 +99,7 @@ protected:\n \t\tEventDispatcher *dispatcher = thread()->eventDispatcher();\n \t\tTimer timer;\n \n-\t\tipa_ = ipaManager_->createIPA(pipe_.get(), 0, 0);\n+\t\tipa_ = ipaManager_->createIPA(pipe_->name(), 0, 0);\n \t\tif (!ipa_) {\n \t\t\tcerr << \"Failed to create VIMC IPA interface\" << endl;\n \t\t\treturn TestFail;\n\nRegards,\n\nHans\n\n\n\n> ---\n> Changes in v5:\n> - Rebase on top of db998e618aaa (\"libcamera: pipeline_handler: Add\n> createIPA() function\") which moved the createIPA() wrapper for\n> pipeline-handlers into the PipelineHandler class\n> \n> Changes in v4:\n> - Rebase, change author to Hans' new email address\n> \n> Changes in v1 from Hans' original patch:\n> - Slightly different approach addressing the review comments on Hans' v1\n> by creating an overload for PipelineHandler::createIPA() that allows\n> pipelines to specify the IPA module name.\n> ---\n> include/libcamera/internal/ipa_manager.h | 6 ++---\n> include/libcamera/internal/ipa_module.h | 4 +--\n> include/libcamera/internal/pipeline_handler.h | 9 ++++++-\n> src/libcamera/ipa_manager.cpp | 8 +++---\n> src/libcamera/ipa_module.cpp | 14 +++++------\n> src/libcamera/pipeline_handler.cpp | 25 +++++++++++++++++--\n> 6 files changed, 47 insertions(+), 19 deletions(-)\n> \n> diff --git a/include/libcamera/internal/ipa_manager.h b/include/libcamera/internal/ipa_manager.h\n> index aaa3ca37c..7ab193112 100644\n> --- a/include/libcamera/internal/ipa_manager.h\n> +++ b/include/libcamera/internal/ipa_manager.h\n> @@ -34,10 +34,10 @@ public:\n> \t~IPAManager();\n> \n> \ttemplate\n> -\tstd::unique_ptr createIPA(PipelineHandler *pipe, uint32_t minVersion,\n> +\tstd::unique_ptr createIPA(const char *name, uint32_t minVersion,\n> \t\t\t\t uint32_t maxVersion)\n> \t{\n> -\t\tIPAModule *m = module(pipe, minVersion, maxVersion);\n> +\t\tIPAModule *m = module(name, minVersion, maxVersion);\n> \t\tif (!m)\n> \t\t\treturn nullptr;\n> \n> @@ -68,7 +68,7 @@ private:\n> \t\t std::vector &files);\n> \tunsigned int addDir(const char *libDir, unsigned int maxDepth = 0);\n> \n> -\tIPAModule *module(PipelineHandler *pipe, uint32_t minVersion,\n> +\tIPAModule *module(const char *name, uint32_t minVersion,\n> \t\t\t uint32_t maxVersion);\n> \n> \tbool isSignatureValid(IPAModule *ipa) const;\n> diff --git a/include/libcamera/internal/ipa_module.h b/include/libcamera/internal/ipa_module.h\n> index 15f19492c..a0a53764e 100644\n> --- a/include/libcamera/internal/ipa_module.h\n> +++ b/include/libcamera/internal/ipa_module.h\n> @@ -36,8 +36,8 @@ public:\n> \n> \tIPAInterface *createInterface();\n> \n> -\tbool match(PipelineHandler *pipe,\n> -\t\t uint32_t minVersion, uint32_t maxVersion) const;\n> +\tbool match(const char *name, uint32_t minVersion,\n> +\t\t uint32_t maxVersion) const;\n> \n> protected:\n> \tstd::string logPrefix() const override;\n> diff --git a/include/libcamera/internal/pipeline_handler.h b/include/libcamera/internal/pipeline_handler.h\n> index 6922ce18e..b60c07b13 100644\n> --- a/include/libcamera/internal/pipeline_handler.h\n> +++ b/include/libcamera/internal/pipeline_handler.h\n> @@ -76,7 +76,14 @@ public:\n> \tstd::unique_ptr createIPA(uint32_t minVersion, uint32_t maxVersion)\n> \t{\n> \t\tIPAManager *ipaManager = manager_->_d()->ipaManager();\n> -\t\treturn ipaManager->createIPA(this, minVersion, maxVersion);\n> +\t\treturn ipaManager->createIPA(name_, minVersion, maxVersion);\n> +\t}\n> +\n> +\ttemplate\n> +\tstd::unique_ptr createIPA(const char *ipaName, uint32_t minVersion, uint32_t maxVersion)\n> +\t{\n> +\t\tIPAManager *ipaManager = manager_->_d()->ipaManager();\n> +\t\treturn ipaManager->createIPA(ipaName, minVersion, maxVersion);\n> \t}\n> \n> protected:\n> diff --git a/src/libcamera/ipa_manager.cpp b/src/libcamera/ipa_manager.cpp\n> index 41918e4c2..b709a024e 100644\n> --- a/src/libcamera/ipa_manager.cpp\n> +++ b/src/libcamera/ipa_manager.cpp\n> @@ -248,15 +248,15 @@ unsigned int IPAManager::addDir(const char *libDir, unsigned int maxDepth)\n> \n> /**\n> * \\brief Retrieve an IPA module that matches a given pipeline handler\n> - * \\param[in] pipe The pipeline handler\n> + * \\param[in] name The IPA module string identifier\n> * \\param[in] minVersion Minimum acceptable version of IPA module\n> * \\param[in] maxVersion Maximum acceptable version of IPA module\n> */\n> -IPAModule *IPAManager::module(PipelineHandler *pipe, uint32_t minVersion,\n> +IPAModule *IPAManager::module(const char *name, uint32_t minVersion,\n> \t\t\t uint32_t maxVersion)\n> {\n> \tfor (const auto &module : modules_) {\n> -\t\tif (module->match(pipe, minVersion, maxVersion))\n> +\t\tif (module->match(name, minVersion, maxVersion))\n> \t\t\treturn module.get();\n> \t}\n> \n> @@ -266,7 +266,7 @@ IPAModule *IPAManager::module(PipelineHandler *pipe, uint32_t minVersion,\n> /**\n> * \\fn IPAManager::createIPA()\n> * \\brief Create an IPA proxy that matches a given pipeline handler\n> - * \\param[in] pipe The pipeline handler that wants a matching IPA proxy\n> + * \\param[in] name The IPA module name\n> * \\param[in] minVersion Minimum acceptable version of IPA module\n> * \\param[in] maxVersion Maximum acceptable version of IPA module\n> *\n> diff --git a/src/libcamera/ipa_module.cpp b/src/libcamera/ipa_module.cpp\n> index e6ea61e44..c89887954 100644\n> --- a/src/libcamera/ipa_module.cpp\n> +++ b/src/libcamera/ipa_module.cpp\n> @@ -462,22 +462,22 @@ IPAInterface *IPAModule::createInterface()\n> }\n> \n> /**\n> - * \\brief Verify if the IPA module matches a given pipeline handler\n> - * \\param[in] pipe Pipeline handler to match with\n> + * \\brief Verify if the IPA module matches a given name\n> + * \\param[in] name The IPA module name\n> * \\param[in] minVersion Minimum acceptable version of IPA module\n> * \\param[in] maxVersion Maximum acceptable version of IPA module\n> *\n> - * This function checks if this IPA module matches the \\a pipe pipeline handler,\n> + * This function checks if this IPA module matches the requested \\a name\n> * and the input version range.\n> *\n> - * \\return True if the pipeline handler matches the IPA module, or false otherwise\n> + * \\return True if the IPA module matches, or false otherwise\n> */\n> -bool IPAModule::match(PipelineHandler *pipe,\n> -\t\t uint32_t minVersion, uint32_t maxVersion) const\n> +bool IPAModule::match(const char *name, uint32_t minVersion,\n> +\t\t uint32_t maxVersion) const\n> {\n> \treturn info_.pipelineVersion >= minVersion &&\n> \t info_.pipelineVersion <= maxVersion &&\n> -\t !strcmp(info_.pipelineName, pipe->name());\n> +\t !strcmp(info_.name, name);\n> }\n> \n> std::string IPAModule::logPrefix() const\n> diff --git a/src/libcamera/pipeline_handler.cpp b/src/libcamera/pipeline_handler.cpp\n> index e7145c1d4..25fc11989 100644\n> --- a/src/libcamera/pipeline_handler.cpp\n> +++ b/src/libcamera/pipeline_handler.cpp\n> @@ -836,11 +836,32 @@ void PipelineHandler::disconnect()\n> */\n> \n> /**\n> - * \\fn PipelineHandler::createIPA()\n> - * \\brief Create an IPA proxy that matches this pipeline handler\n> + * \\fn PipelineHandler::createIPA(const char *ipaName, uint32_t minVersion, uint32_t maxVersion)\n> + * \\brief Create an IPA proxy that matches the requested name and version\n> + * \\param[in] ipaName The IPA module name\n> * \\param[in] minVersion Minimum acceptable version of IPA module\n> * \\param[in] maxVersion Maximum acceptable version of IPA module\n> *\n> + * Create an IPA module using \\a ipaName as the matching identifier. This\n> + * overload allows pipeline handlers to create an IPA module by specifying its\n> + * name instead of relying on the fact that the IPA module matches the pipeline\n> + * handler's one.\n> + *\n> + * \\return A newly created IPA proxy, or nullptr if no matching IPA module is\n> + * found or if the IPA proxy fails to initialize\n> + */\n> +\n> +/**\n> + * \\fn PipelineHandler::createIPA(uint32_t minVersion, uint32_t maxVersion)\n> + * \\brief Create an IPA proxy that matches the pipeline handler name and the\n> + * requested version\n> + * \\param[in] minVersion Minimum acceptable version of IPA module\n> + * \\param[in] maxVersion Maximum acceptable version of IPA module\n> + *\n> + * Create an IPA module using the pipeline handler name as the matching\n> + * identifier. This overload allows pipeline handler to create an IPA module\n> + * whose name matches the pipeline handler one.\n> + *\n> * \\return A newly created IPA proxy, or nullptr if no matching IPA module is\n> * found or if the IPA proxy fails to initialize\n> */","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 5A3BDBDCBC\n\tfor ;\n\tThu, 21 May 2026 18:49:58 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id B422863024;\n\tThu, 21 May 2026 20:49:56 +0200 (CEST)","from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com\n\t[205.220.180.131])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id E038D62E6A\n\tfor ;\n\tThu, 21 May 2026 20:49:54 +0200 (CEST)","from pps.filterd (m0279870.ppops.net [127.0.0.1])\n\tby mx0a-0031df01.pphosted.com (8.18.1.11/8.18.1.11) with ESMTP id\n\t64LGk9pB4155526 for ;\n\tThu, 21 May 2026 18:49:53 GMT","from mail-qt1-f197.google.com (mail-qt1-f197.google.com\n\t[209.85.160.197])\n\tby mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 4e9r96422u-1\n\t(version=TLSv1.3 cipher=TLS_AES_128_GCM_SHA256 bits=128 verify=NOT)\n\tfor ;\n\tThu, 21 May 2026 18:49:53 +0000 (GMT)","by mail-qt1-f197.google.com with SMTP id\n\td75a77b69052e-514b673c8f1so94391591cf.3\n\tfor ;\n\tThu, 21 May 2026 11:49:53 -0700 (PDT)","from ?IPV6:2001:1c00:c32:7800:5bfa:a036:83f0:f9ec?\n\t(2001-1c00-0c32-7800-5bfa-a036-83f0-f9ec.cable.dynamic.v6.ziggo.nl.\n\t[2001:1c00:c32:7800:5bfa:a036:83f0:f9ec])\n\tby smtp.gmail.com with ESMTPSA id\n\ta640c23a62f3a-bdc88371cc5sm85350766b.28.2026.05.21.11.49.50\n\t(version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128);\n\tThu, 21 May 2026 11:49:50 -0700 (PDT)"],"Authentication-Results":"lancelot.ideasonboard.com; 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