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Subject: Re: [PATCHv3 1/1] [tools/selftests]: android/ion: userspace test
 utility for ion buffer sharing
To:     Pintu Kumar <pintu.ping@gmail.com>
Cc:     shuah@kernel.org, Laura Abbott <labbott@redhat.com>,
        linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        dvhart@infradead.org,
        Bamvor Zhang Jian <bamvor.zhangjian@linaro.org>,
        Shuah Khan <shuahkh@osg.samsung.com>
References: <1507049339-16963-1-git-send-email-pintu.ping@gmail.com>
 <1507981006-7430-1-git-send-email-pintu.ping@gmail.com>
 <2c0cf8c1-7f4d-5639-58d3-0fd7595df256@redhat.com>
 <9fb9b4ee-2834-511b-ff78-d14ea5609728@kernel.org>
 <CAOuPNLg-mgy0KyyR_0wiPPZ1ct7tdrVkQMnEFk_vynXtFFH3Cg@mail.gmail.com>
From:   Shuah Khan <shuahkh@osg.samsung.com>
Message-ID: <53743866-3a76-e499-b49c-5079ad73e3be@osg.samsung.com>
Date:   Fri, 20 Oct 2017 08:40:49 -0600
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On 10/18/2017 04:38 AM, Pintu Kumar wrote:
> On Wed, Oct 18, 2017 at 2:28 AM, Shuah Khan <shuah@kernel.org> wrote:
>> On 10/17/2017 02:21 PM, Laura Abbott wrote:
>>> On 10/14/2017 04:36 AM, Pintu Agarwal wrote:
>>>> This is a test utility to verify ION buffer sharing in user space
>>>> between 2 independent processes.
>>>> It uses unix domain socket (with SCM_RIGHTS) as IPC to transfer an FD to
>>>> another process to share the same buffer.
>>>> This utility demonstrates how ION buffer sharing can be implemented between
>>>> two user space processes, using various heap types.
>>>>
>>>> This utility is made to be run as part of kselftest framework in kernel.
>>>> The utility is verified on Ubuntu-32 bit system with Linux Kernel 4.14,
>>>> using ION system heap and CMA heap.
>>>>
>>>> For more information about the utility please check the README file.
>>>>
>>>> Signed-off-by: Pintu Agarwal <pintu.ping@gmail.com>
>>>> ---
>>>>  tools/testing/selftests/Makefile                   |   3 +-
>>>>  tools/testing/selftests/android/Makefile           |  44 ++++
>>>>  tools/testing/selftests/android/ion/.gitignore     |   2 +
>>>>  tools/testing/selftests/android/ion/Makefile       |  16 ++
>>>>  tools/testing/selftests/android/ion/README         | 132 +++++++++++
>>>>  tools/testing/selftests/android/ion/config         |   3 +
>>>>  tools/testing/selftests/android/ion/ion_test.sh    |  61 +++++
>>>>  .../testing/selftests/android/ion/ionapp_export.c  | 151 ++++++++++++
>>>>  .../testing/selftests/android/ion/ionapp_import.c  |  88 +++++++
>>>>  tools/testing/selftests/android/ion/ionutils.c     | 259 +++++++++++++++++++++
>>>>  tools/testing/selftests/android/ion/ionutils.h     |  55 +++++
>>>>  tools/testing/selftests/android/ion/ipcsocket.c    | 227 ++++++++++++++++++
>>>>  tools/testing/selftests/android/ion/ipcsocket.h    |  35 +++
>>>>  tools/testing/selftests/android/run.sh             |   3 +
>>>>  14 files changed, 1078 insertions(+), 1 deletion(-)
>>>>  create mode 100644 tools/testing/selftests/android/Makefile
>>>>  create mode 100644 tools/testing/selftests/android/ion/.gitignore
>>>>  create mode 100644 tools/testing/selftests/android/ion/Makefile
>>>>  create mode 100644 tools/testing/selftests/android/ion/README
>>>>  create mode 100644 tools/testing/selftests/android/ion/config
>>>>  create mode 100755 tools/testing/selftests/android/ion/ion_test.sh
>>>>  create mode 100644 tools/testing/selftests/android/ion/ionapp_export.c
>>>>  create mode 100644 tools/testing/selftests/android/ion/ionapp_import.c
>>>>  create mode 100644 tools/testing/selftests/android/ion/ionutils.c
>>>>  create mode 100644 tools/testing/selftests/android/ion/ionutils.h
>>>>  create mode 100644 tools/testing/selftests/android/ion/ipcsocket.c
>>>>  create mode 100644 tools/testing/selftests/android/ion/ipcsocket.h
>>>>  create mode 100755 tools/testing/selftests/android/run.sh
>>>>
>>>> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
>>>> index ff80564..61bc77b 100644
>>>> --- a/tools/testing/selftests/Makefile
>>>> +++ b/tools/testing/selftests/Makefile
>>>> @@ -1,4 +1,5 @@
>>>> -TARGETS =  bpf
>>>> +TARGETS = android
>>>> +TARGETS += bpf
>>>>  TARGETS += breakpoints
>>>>  TARGETS += capabilities
>>>>  TARGETS += cpufreq
>>>> diff --git a/tools/testing/selftests/android/Makefile b/tools/testing/selftests/android/Makefile
>>>> new file mode 100644
>>>> index 0000000..ee76446
>>>> --- /dev/null
>>>> +++ b/tools/testing/selftests/android/Makefile
>>>> @@ -0,0 +1,44 @@
>>>> +SUBDIRS := ion
>>>> +
>>>> +TEST_PROGS := run.sh
>>>> +
>>>> +.PHONY: all clean
>>>> +
>>>> +include ../lib.mk
>>>> +
>>>> +all:
>>>> +    @for DIR in $(SUBDIRS); do              \
>>>> +            BUILD_TARGET=$(OUTPUT)/$$DIR;   \
>>>> +            mkdir $$BUILD_TARGET  -p;       \
>>>> +            make OUTPUT=$$BUILD_TARGET -C $$DIR $@;\
>>>> +            if [ -e $$DIR/$(TEST_PROGS) ]; then
>>>> +                    rsync -a $$DIR/$(TEST_PROGS) $$BUILD_TARGET/;
>>>> +            fi
>>>> +    done
>>>> +
>>>> +override define RUN_TESTS
>>>> +    @cd $(OUTPUT); ./run.sh
>>>> +endef
>>>> +
>>>> +override define INSTALL_RULE
>>>> +    mkdir -p $(INSTALL_PATH)
>>>> +    install -t $(INSTALL_PATH) $(TEST_PROGS) $(TEST_PROGS_EXTENDED) $(TEST_FILES)
>>>> +
>>>> +    @for SUBDIR in $(SUBDIRS); do \
>>>> +            BUILD_TARGET=$(OUTPUT)/$$SUBDIR;        \
>>>> +            mkdir $$BUILD_TARGET  -p;       \
>>>> +            $(MAKE) OUTPUT=$$BUILD_TARGET -C $$SUBDIR INSTALL_PATH=$(INSTALL_PATH)/$$SUBDIR install; \
>>>> +    done;
>>>> +endef
>>>> +
>>>> +override define EMIT_TESTS
>>>> +    echo "./run.sh"
>>>> +endef
>>>> +
>>>> +override define CLEAN
>>>> +    @for DIR in $(SUBDIRS); do              \
>>>> +            BUILD_TARGET=$(OUTPUT)/$$DIR;   \
>>>> +            mkdir $$BUILD_TARGET  -p;       \
>>>> +            make OUTPUT=$$BUILD_TARGET -C $$DIR $@;\
>>>> +    done
>>>> +endef
>>>> diff --git a/tools/testing/selftests/android/ion/.gitignore b/tools/testing/selftests/android/ion/.gitignore
>>>> new file mode 100644
>>>> index 0000000..67e6f39
>>>> --- /dev/null
>>>> +++ b/tools/testing/selftests/android/ion/.gitignore
>>>> @@ -0,0 +1,2 @@
>>>> +ionapp_export
>>>> +ionapp_import
>>>> diff --git a/tools/testing/selftests/android/ion/Makefile b/tools/testing/selftests/android/ion/Makefile
>>>> new file mode 100644
>>>> index 0000000..b84e3b1
>>>> --- /dev/null
>>>> +++ b/tools/testing/selftests/android/ion/Makefile
>>>> @@ -0,0 +1,16 @@
>>>> +
>>>> +INCLUDEDIR := -I../../../../../drivers/staging/android/uapi/
>>>> +CFLAGS := $(INCLUDEDIR) -Wall -O2 -g
>>>> +
>>>> +TEST_GEN_FILES := ionapp_export ionapp_import
>>>> +
>>>> +all: $(TEST_GEN_FILES)
>>>> +
>>>> +$(TEST_GEN_FILES): ipcsocket.c ionutils.c
>>>> +
>>>> +TEST_PROGS := ion_test.sh
>>>> +
>>>> +include ../../lib.mk
>>>> +
>>>> +$(OUTPUT)/ionapp_export: ionapp_export.c ipcsocket.c ionutils.c
>>>> +$(OUTPUT)/ionapp_import: ionapp_import.c ipcsocket.c ionutils.c
>>>> diff --git a/tools/testing/selftests/android/ion/README b/tools/testing/selftests/android/ion/README
>>>> new file mode 100644
>>>> index 0000000..163e353
>>>> --- /dev/null
>>>> +++ b/tools/testing/selftests/android/ion/README
>>>> @@ -0,0 +1,132 @@
>>>> +ION BUFFER SHARING UTILITY
>>>> +==========================
>>>> +File: ion_test.sh : Utility to test ION driver buffer sharing mechanism.
>>>> +Author: Pintu Kumar <pintu.ping@gmail.com>
>>>> +
>>>> +Introduction:
>>>> +-------------
>>>> +This is a test utility to verify ION buffer sharing in user space
>>>> +between 2 independent processes.
>>>> +It uses unix domain socket (with SCM_RIGHTS) as IPC to transfer an FD to
>>>> +another process to share the same buffer.
>>>> +This utility demonstrates how ION buffer sharing can be implemented between
>>>> +two user space processes, using various heap types.
>>>> +The following heap types are supported by ION driver.
>>>> +ION_HEAP_TYPE_SYSTEM (0)
>>>> +ION_HEAP_TYPE_SYSTEM_CONTIG (1)
>>>> +ION_HEAP_TYPE_CARVEOUT (2)
>>>> +ION_HEAP_TYPE_CHUNK (3)
>>>> +ION_HEAP_TYPE_DMA (4)
>>>> +
>>>> +By default only the SYSTEM and SYSTEM_CONTIG heaps are supported.
>>>> +Each heap is associated with the respective heap id.
>>>> +This utility is designed in the form of client/server program.
>>>> +The server part (ionapp_export) is the exporter of the buffer.
>>>> +It is responsible for creating an ION client, allocating the buffer based on
>>>> +the heap id, writing some data to this buffer and then exporting the FD
>>>> +(associated with this buffer) to another process using socket IPC.
>>>> +This FD is called as buffer FD (which is different than the ION client FD).
>>>> +
>>>> +The client part (ionapp_import) is the importer of the buffer.
>>>> +It retrives the FD from the socket data and installs into its address space.
>>>> +This new FD internally points to the same kernel buffer.
>>>> +So first it reads the data that is stored in this buffer and prints it.
>>>> +Then it writes the different size of data (it could be different data) to the
>>>> +same buffer.
>>>> +Finally the buffer FD must be closed by both the exporter and importer.
>>>> +Thus the same kernel buffer is shared among two user space processes using
>>>> +ION driver and only one time allocation.
>>>> +
>>>> +Prerequisite:
>>>> +-------------
>>>> +This utility works only if /dev/ion interface is present.
>>>> +The following configs needs to be enabled in kernel to include ion driver.
>>>> +CONFIG_ANDROID=y
>>>> +CONFIG_ION=y
>>>> +CONFIG_ION_SYSTEM_HEAP=y
>>>
>>> You also need CONFIG_STAGING right now as well.
>>
> 
> Ok, added CONFIG_STAGING under config and README
> 
>> In which case, please make sure the test fails gracefully when the
>> these config options are disabled.
>>
>> What does the test do when all of these options are disabled?
>>
> I assume that if these configs are not present the /dev/ion will also
> not exists.
> If that is the case then, I don't proceed with the test.
> This is checked under ion_test script using: check_device
> 
>>>
>>>> +
>>>> +This utility requires to be run as root user.
>>>> +
>>>> +
>>>> +Compile and test:
>>>> +-----------------
>>>> +This utility is made to be run as part of kselftest framework in kernel.
>>>> +To compile and run using kselftest you can simply do the following from the
>>>> +kernel top directory.
>>>> +linux$ make TARGETS=android kselftest
>>
>> Please make sure
>>
>> make O=/tmp/kselftest TARGETS=android kselftest
>>
>> works.
>>
> 
> Ok when I specify O as output directory. It did not work.
> ./run.sh: 3: ./run.sh: ./ion_test.sh: not found
> ../lib.mk:41: recipe for target 'run_tests' failed
> 
> When I checked /tmp/kselftest/ion/, I see that ion_test.sh is not installed.
> Only the executable are installed.
> I followed the same Makefile as futex.
> Currently I am trying to figure out what could be the problem.
> Any hint will be really appreciated.

Please see the latest futex Makefile from 4.14. You will see that the
TEST_PROGS get copied from its all target for sub-dirs. You just have to
add a copy in that path

if [ -e $$DIR/$(TEST_PROGS) ]; then
     rsync -a $$DIR/$(TEST_PROGS) $$BUILD_TARGET/;
fi


All target from futex/Makefile
all:
        @for DIR in $(SUBDIRS); do              \
                BUILD_TARGET=$(OUTPUT)/$$DIR;   \
                mkdir $$BUILD_TARGET  -p;       \
                make OUTPUT=$$BUILD_TARGET -C $$DIR $@;\
                if [ -e $$DIR/$(TEST_PROGS) ]; then
                        rsync -a $$DIR/$(TEST_PROGS) $$BUILD_TARGET/;
                fi
        done


thanks,
-- Shuah


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