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Subject: Re: [PATCHv3 1/1] [tools/selftests]: android/ion: userspace test
 utility for ion buffer sharing
To:     Pintu Agarwal <pintu.ping@gmail.com>, linux-kernel@vger.kernel.org,
        linux-kselftest@vger.kernel.org, gregkh@linuxfoundation.org,
        shuah@kernel.org, dvhart@infradead.org, bamvor.zhangjian@linaro.org
References: <1507049339-16963-1-git-send-email-pintu.ping@gmail.com>
 <1507981006-7430-1-git-send-email-pintu.ping@gmail.com>
From:   Laura Abbott <labbott@redhat.com>
Message-ID: <2c0cf8c1-7f4d-5639-58d3-0fd7595df256@redhat.com>
Date:   Tue, 17 Oct 2017 13:21:06 -0700
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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.

> +
> +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
> +Or you can also use:
> +linux$ make -C tools/testing/selftests TARGETS=android run_tests
> +Using the selftest it can directly execute the ion_test.sh script to test the
> +buffer sharing using ion system heap.
> +Currently the heap size is hard coded as just 10 bytes inside this script.
> +You need to be a root user to run under selftest.
> +
> +You can also compile and test manually using the following steps:
> +ion$ make
> +These will generate 2 executable: ionapp_export, ionapp_import
> +Now you can run the export and import manually by specifying the heap type
> +and the heap size.
> +You can also directly execute the shell script to run the test automatically.
> +Simply use the following command to run the test.
> +ion$ sudo ./ion_test.sh
> +
> +Test Results:
> +-------------
> +The utility is verified on Ubuntu-32 bit system with Linux Kernel 4.14.
> +Here is the snapshot of the test result using kselftest.
> +
> +linux# make TARGETS=android kselftest
> +make[2]: Entering directory '/home/pintu/PINTU/OPEN_SOURCE/KERNEL/
> +linux/tools/testing/selftests/android'
> +make[3]: Entering directory '/home/pintu/PINTU/OPEN_SOURCE/KERNEL/
> +linux/tools/testing/selftests/android/ion'
> +gcc -I../../../../../drivers/staging/android/uapi/ -Wall -O2 -g
> +ionapp_export.c ipcsocket.c ionutils.c   -o ionapp_export
> +gcc -I../../../../../drivers/staging/android/uapi/ -Wall -O2 -g
> +ionapp_import.c ipcsocket.c ionutils.c   -o ionapp_import
> +
> +heap_type: 0, heap_size: 10
> +--------------------------------------
> +heap type: 0
> +  heap id: 1
> +heap name: ion_system_heap
> +--------------------------------------
> +Fill buffer content:
> +0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd
> +Sharing fd: 6, Client fd: 5
> +<ion_close_buffer_fd>: buffer release successfully....
> +Received buffer fd: 4
> +Read buffer content:
> +0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0x0 0x0 0x0 0x0 0x0 0x0
> +0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0
> +Fill buffer content:
> +0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd
> +0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd
> +0xfd 0xfd
> +<ion_close_buffer_fd>: buffer release successfully....
> +ion_test.sh: heap_type: 0 - [PASS]
> +
> +heap_type: 1, heap_size: 10
> +--------------------------------------
> +heap type: 1
> +  heap id: 0
> +heap name: ion_system_contig_heap
> +--------------------------------------
> +Fill buffer content:
> +0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd
> +Sharing fd: 6, Client fd: 5
> +<ion_close_buffer_fd>: buffer release successfully....
> +Received buffer fd: 4
> +Read buffer content:
> +0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0x0 0x0 0x0 0x0 0x0 0x0 0x0
> +0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0 0x0
> +Fill buffer content:
> +0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd
> +0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd 0xfd
> +0xfd 0xfd
> +<ion_close_buffer_fd>: buffer release successfully....
> +ion_test.sh: heap_type: 1 - [PASS]
> +
> +ion_test.sh: done
> +make[2]: Leaving directory '/home/pintu/PINTU/OPEN_SOURCE/KERNEL/
> +linux/tools/testing/selftests/android'
> diff --git a/tools/testing/selftests/android/ion/config b/tools/testing/selftests/android/ion/config
> new file mode 100644
> index 0000000..614b615
> --- /dev/null
> +++ b/tools/testing/selftests/android/ion/config
> @@ -0,0 +1,3 @@
> +CONFIG_ANDROID=y
> +CONFIG_ION=y
> +CONFIG_ION_SYSTEM_HEAP=y
> diff --git a/tools/testing/selftests/android/ion/ion_test.sh b/tools/testing/selftests/android/ion/ion_test.sh
> new file mode 100755
> index 0000000..dc77a39
> --- /dev/null
> +++ b/tools/testing/selftests/android/ion/ion_test.sh
> @@ -0,0 +1,61 @@
> +#!/bin/bash
> +
> +heapsize=10

Nearly all the heaps are going to operate on page size granularity,
just set this to 4096.

> +TCID="ion_test.sh"
> +errcode=0
> +
> +run_test()
> +{
> +	heaptype=$1
> +	./ionapp_export -i $heaptype -s $heapsize &
> +	sleep 1
> +	./ionapp_import
> +	if [ $? -ne 0 ]; then
> +		echo "$TCID: heap_type: $heaptype - [FAIL]"
> +		errcode=1
> +	else
> +		echo "$TCID: heap_type: $heaptype - [PASS]"
> +	fi
> +	sleep 1
> +	echo ""
> +}
> +
> +check_root()
> +{
> +	uid=$(id -u)
> +	if [ $uid -ne 0 ]; then
> +		echo $TCID: must be run as root >&2
> +		exit 0
> +	fi
> +}
> +
> +check_device()
> +{
> +	DEVICE=/dev/ion
> +	if [ ! -e $DEVICE ]; then
> +		echo $TCID: No $DEVICE device found >&2
> +		echo $TCID: May be CONFIG_ION is not set >&2
> +		exit 0
> +	fi
> +}
> +
> +main_function()
> +{
> +	check_device
> +	check_root
> +
> +	# ION_SYSTEM_HEAP TEST
> +	run_test 0
> +	# ION_SYSTEM_CONTIG_HEAP TEST
> +	run_test 1
> +	# ION_CARVEOUT HEAP TEST
> +	#run_test 2
> +	# ION_CHUNK_HEAP TEST
> +	#run_test 3
> +	# ION_CMA_HEAP TEST
> +	#run_test 4
> +}
> +
> +main_function
> +echo "$TCID: done"
> +exit $errcode
> diff --git a/tools/testing/selftests/android/ion/ionapp_export.c b/tools/testing/selftests/android/ion/ionapp_export.c
> new file mode 100644
> index 0000000..59b434f
> --- /dev/null
> +++ b/tools/testing/selftests/android/ion/ionapp_export.c
> @@ -0,0 +1,151 @@
> +/*
> + * ionapp_export.c
> + *
> + * It is a user space utility to create and export android
> + * ion memory buffer fd to another process using unix domain socket as IPC.
> + * This acts like a server for ionapp_import(client).
> + * So, this server has to be started first before the client.
> + *
> + * Copyright (C) 2017 Pintu Kumar <pintu.ping@gmail.com>
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + */
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <unistd.h>
> +#include <errno.h>
> +#include <sys/time.h>
> +#include "ionutils.h"
> +#include "ipcsocket.h"
> +
> +
> +void print_usage(int argc, char *argv[])
> +{
> +	printf("********** HEAP TYPE ***********\n");
> +	printf("0: ION_HEAP_TYPE_SYSTEM\n");
> +	printf("1: ION_HEAP_TYPE_SYSTEM_CONTIG\n");
> +	printf("2: ION_HEAP_TYPE_CARVEOUT\n");
> +	printf("3: ION_HEAP_TYPE_CHUNK\n");
> +	printf("4: ION_HEAP_TYPE_DMA\n");
> +
> +	printf("Usage: %s [-h <help>] [-i <heap id>] [-s <size in bytes>]\n",
> +		argv[0]);
> +}> +

Again, there is no need to test multiple heaps. Just
do the test with system heap and remove all the
other ones.

Thanks,
Laura

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