Date:   Mon, 30 Oct 2017 15:56:10 -0700
From:   Laura Abbott <labbott@...hat.com>
To:     Pintu Agarwal <pintu.ping@...il.com>, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, gregkh@...uxfoundation.org,
        shuah@...nel.org, dvhart@...radead.org,
        bamvor.zhangjian@...aro.org, pintu_agarwal@...oo.com
Subject: Re: [PATCHv4 1/1] [tools/selftests]: android/ion: userspace test
 utility for ion buffer sharing

On 10/23/2017 04:26 PM, 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@...il.com>
> ---
>   tools/testing/selftests/Makefile                   |   3 +-
>   tools/testing/selftests/android/Makefile           |  46 ++++
>   tools/testing/selftests/android/ion/.gitignore     |   2 +
>   tools/testing/selftests/android/ion/Makefile       |  16 ++
>   tools/testing/selftests/android/ion/README         | 101 ++++++++
>   tools/testing/selftests/android/ion/config         |   4 +
>   tools/testing/selftests/android/ion/ion_test.sh    |  61 +++++
>   .../testing/selftests/android/ion/ionapp_export.c  | 144 ++++++++++++
>   .../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, 1043 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..1a74922
> --- /dev/null
> +++ b/tools/testing/selftests/android/Makefile
> @@ -0,0 +1,46 @@
> +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 $@;\
> +		#SUBDIR test prog name should be in the form: SUBDIR_test.sh
> +		TEST=$$DIR"_test.sh"; \
> +		if [ -e $$DIR/$$TEST ]; then
> +			rsync -a $$DIR/$$TEST $$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..1399a5e
> --- /dev/null
> +++ b/tools/testing/selftests/android/ion/Makefile
> @@ -0,0 +1,16 @@
> +
> +INCLUDEDIR := -I../../../../../drivers/staging/android/uapi/
> +CFLAGS := $(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..21783e9
> --- /dev/null
> +++ b/tools/testing/selftests/android/ion/README
> @@ -0,0 +1,101 @@
> +ION BUFFER SHARING UTILITY
> +==========================
> +File: ion_test.sh : Utility to test ION driver buffer sharing mechanism.
> +Author: Pintu Kumar <pintu.ping@...il.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_STAGING=y
> +CONFIG_ION=y
> +CONFIG_ION_SYSTEM_HEAP=y
> +
> +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
> +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]
> +
> +ion_test.sh: done
> diff --git a/tools/testing/selftests/android/ion/config b/tools/testing/selftests/android/ion/config
> new file mode 100644
> index 0000000..19db6ca
> --- /dev/null
> +++ b/tools/testing/selftests/android/ion/config
> @@ -0,0 +1,4 @@
> +CONFIG_ANDROID=y
> +CONFIG_STAGING=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..65bb28f
> --- /dev/null
> +++ b/tools/testing/selftests/android/ion/ion_test.sh
> @@ -0,0 +1,61 @@
> +#!/bin/bash
> +
> +heapsize=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..6eaea10
> --- /dev/null
> +++ b/tools/testing/selftests/android/ion/ionapp_export.c
> @@ -0,0 +1,144 @@
> +/*
> + * 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@...il.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("Usage: %s [-h <help>] [-i <heap id>] [-s <size in bytes>]\n",
> +		argv[0]);
> +}
> +
> +int main(int argc, char *argv[])
> +{
> +	int opt, ret, status, heapid;
> +	int sockfd, client_fd, shared_fd;
> +	unsigned char *map_buf;
> +	unsigned long map_len, heap_type, heap_size, flags;
> +	struct ion_buffer_info info;
> +	struct socket_info skinfo;
> +
> +	if (argc < 2) {
> +		print_usage(argc, argv);
> +		return -1;
> +	}
> +
> +	heap_size = 0;
> +	flags = 0;
> +
> +	while ((opt = getopt(argc, argv, "hi:s:")) != -1) {
> +		switch (opt) {
> +		case 'h':
> +			print_usage(argc, argv);
> +			exit(0);
> +			break;
> +		case 'i':
> +			heapid = atoi(optarg);
> +			switch (heapid) {
> +			case 0:
> +				heap_type = ION_HEAP_TYPE_SYSTEM;
> +				break;
> +			case 1:
> +				heap_type = ION_HEAP_TYPE_SYSTEM_CONTIG;
> +				break;
> +			case 2:
> +				heap_type = ION_HEAP_TYPE_CARVEOUT;
> +				break;
> +			case 3:
> +				heap_type = ION_HEAP_TYPE_CHUNK;
> +				break;
> +			case 4:
> +				heap_type = ION_HEAP_TYPE_DMA;
> +				break;
> +			default:
> +				printf("ERROR: Wrong - heap type\n");
> +				exit(1);

Again, why are we still supporting multiple heaps. You need to
remove all references to heaps other than the system heap
everywhere in the test.

Thanks,
Laura

> +			}
> +			break;
> +		case 's':
> +			heap_size = atoi(optarg);
> +			break;
> +		default:
> +			print_usage(argc, argv);
> +			exit(1);
> +			break;
> +		}
> +	}

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