Message-ID: <6ef81e28-7656-ccf5-5d4d-ef315ae250ce@kernel.org>
Date:   Wed, 18 Apr 2018 13:58:57 -0600
From:   Shuah Khan <shuah@...nel.org>
To:     Tom Hromatka <tom.hromatka@...cle.com>, davem@...emloft.net
Cc:     sparclinux@...r.kernel.org, arnd@...db.de,
        gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org, allen.pais@...cle.com,
        khalid.aziz@...cle.com, shannon.nelson@...cle.com,
        anthony.yznaga@...cle.com, Shuah Khan <shuah@...nel.org>,
        Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [PATCH 2/2] selftests: sparc64: char: Selftest for privileged ADI
 driver

Hi Tom,

On 04/18/2018 10:29 AM, Tom Hromatka wrote:
> Add a selftest for the sparc64 privileged ADI driver.  These
> tests verify the read(), pread(), write(), pwrite(), and seek()
> functionality of the driver.  The tests also report simple
> performance statistics:
> 
>         Syscall Call    AvgTime AvgSize
>                 Count   (ticks) (bytes)
>         -------------------------------
>         read          3  167134    8133
>         pread         4  137217    6741
>         write         3   73787    8133
>         pwrite        4   65832    6741
>         seek         10    2422       0
> 
>         Ran 8 tests
>         All tests passed
> 
> Signed-off-by: Tom Hromatka <tom.hromatka@...cle.com>
> Reviewed-by: Allen Pais <allen.pais@...cle.com>

Thanks for the patch. A few comments below:

> ---
>  tools/testing/selftests/Makefile                   |   1 +
>  tools/testing/selftests/sparc64/Makefile           |  52 ++
>  tools/testing/selftests/sparc64/drivers/.gitignore |   1 +
>  tools/testing/selftests/sparc64/drivers/Makefile   |  13 +
>  tools/testing/selftests/sparc64/drivers/adi-test.c | 727 +++++++++++++++++++++
>  5 files changed, 794 insertions(+)
>  create mode 100644 tools/testing/selftests/sparc64/Makefile
>  create mode 100644 tools/testing/selftests/sparc64/drivers/.gitignore
>  create mode 100644 tools/testing/selftests/sparc64/drivers/Makefile
>  create mode 100644 tools/testing/selftests/sparc64/drivers/adi-test.c
> 
> diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
> index 7442dfb73b7f..94da632579e7 100644
> --- a/tools/testing/selftests/Makefile
> +++ b/tools/testing/selftests/Makefile
> @@ -28,6 +28,7 @@ TARGETS += ptrace
>  TARGETS += seccomp
>  TARGETS += sigaltstack
>  TARGETS += size
> +TARGETS += sparc64
>  TARGETS += splice
>  TARGETS += static_keys
>  TARGETS += sync
> diff --git a/tools/testing/selftests/sparc64/Makefile b/tools/testing/selftests/sparc64/Makefile
> new file mode 100644
> index 000000000000..b18bbce141c9
> --- /dev/null
> +++ b/tools/testing/selftests/sparc64/Makefile
> @@ -0,0 +1,52 @@
> +# Makefile for sparc selftests
> +
> +# ARCH can be overridden by the user for cross compiling
> +ARCH ?= $(shell uname -m)
> +
> +ifeq ($(ARCH),sparc64)
> +
> +GIT_VERSION = $(shell git describe --always --long --dirty || echo "unknown")
> +
> +CFLAGS := -Wall -Werror -O2 -DGIT_VERSION='"$(GIT_VERSION)"' -I$(CURDIR) $(CFLAGS)
> +
> +export CFLAGS
> +
> +SUB_DIRS = drivers
> +
> +endif
> +
> +all: $(SUB_DIRS)
> +
> +$(SUB_DIRS):
> +	$(MAKE) -k -C $@ all
> +
> +include ../lib.mk
> +

The following overrides will require changes to work when KBUILD_OUTPUT
and O= options are specified when kselftest is run.

Please take a look at the following tests as an example:
tools/testing/selftests/android/Makefile
tools/testing/selftests/android/ion/Makefile

> +override define RUN_TESTS
> +	@for TARGET in $(SUB_DIRS); do \
> +		$(MAKE) -C $$TARGET run_tests; \
> +	done;
> +endef
> +

Use BUILD_TARGET and OUTPUT vars to handle build object relocation. 

> +override define INSTALL_RULE
> +	@for TARGET in $(SUB_DIRS); do \
> +		$(MAKE) -C $$TARGET install; \
> +	done;
> +endef
> +
Please ensure INSTALL_PATH is honored in INSTALL_RULE.

> +override define EMIT_TESTS
> +	@for TARGET in $(SUB_DIRS); do \
> +		$(MAKE) -s -C $$TARGET emit_tests; \
> +	done;
> +endef
> +

Same comment for TARGET here.

> +clean:
> +	@for TARGET in $(SUB_DIRS); do \
> +		$(MAKE) -C $$TARGET clean; \

Same comment for TARGET here.

> +	done;
> +	rm -f tags
> +
> +tags:
> +	find . -name '*.c' -o -name '*.h' | xargs ctags


> +
> +.PHONY: tags $(SUB_DIRS)
> diff --git a/tools/testing/selftests/sparc64/drivers/.gitignore b/tools/testing/selftests/sparc64/drivers/.gitignore
> new file mode 100644
> index 000000000000..90e835ed74e6
> --- /dev/null
> +++ b/tools/testing/selftests/sparc64/drivers/.gitignore
> @@ -0,0 +1 @@
> +adi-test
> diff --git a/tools/testing/selftests/sparc64/drivers/Makefile b/tools/testing/selftests/sparc64/drivers/Makefile
> new file mode 100644
> index 000000000000..06b50943eddf
> --- /dev/null
> +++ b/tools/testing/selftests/sparc64/drivers/Makefile
> @@ -0,0 +1,13 @@
> +noarg:
> +	$(MAKE) -C ../
> +
> +TEST_PROGS := adi-test> +> +all: $(TEST_PROGS)
> +
> +$(TEST_PROGS): adi-test.c

Hmm. this doesn't look right.

> +
> +include ../../lib.mk
> +
> +clean:
> +	rm -f $(TEST_PROGS)
> diff --git a/tools/testing/selftests/sparc64/drivers/adi-test.c b/tools/testing/selftests/sparc64/drivers/adi-test.c
> new file mode 100644
> index 000000000000..8ea6671b7b58
> --- /dev/null
> +++ b/tools/testing/selftests/sparc64/drivers/adi-test.c
> @@ -0,0 +1,727 @@
> +/*	adi_test.c
> + *
> + *	Unit tests for adi.c
> + *
> + *	(c) Copyright 2017, 2018 Oracle and/or its affiliates
> + *
> + *	Tests for the privileged interface to SPARC ADI
> + *
> + *	This program is free software; you can redistribute it and/or
> + *	modify it under the terms of the GNU General Public License
> + *	as published by the Free Software Foundation; either version
> + *	2 of the License, or (at your option) any later version.
> + *
> + *	Author: Tom Hromatka <tom.hromatka@...cle.com>
> + */
> +#include <linux/kernel.h>
> +#include <errno.h>
> +#include <fcntl.h>
> +#include <stdarg.h>
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <sys/syscall.h>
> +#include <sys/types.h>
> +#include <sys/stat.h>
> +#include <unistd.h>
> +
> +#define DEBUG_LEVEL_1_BIT	(0x0001)
> +#define DEBUG_LEVEL_2_BIT	(0x0002)
> +#define DEBUG_LEVEL_3_BIT	(0x0004)
> +#define DEBUG_LEVEL_4_BIT	(0x0008)
> +#define DEBUG_TIMING_BIT	(0x1000)
> +
> +#ifndef ARRAY_SIZE
> +# define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
> +#endif
> +
> +/* bit mask of enabled bits to print */
> +#define DEBUG 0x0001
> +
> +#define DEBUG_PRINT_L1(...)	debug_print(DEBUG_LEVEL_1_BIT, __VA_ARGS__)
> +#define DEBUG_PRINT_L2(...)	debug_print(DEBUG_LEVEL_2_BIT, __VA_ARGS__)
> +#define DEBUG_PRINT_L3(...)	debug_print(DEBUG_LEVEL_3_BIT, __VA_ARGS__)
> +#define DEBUG_PRINT_L4(...)	debug_print(DEBUG_LEVEL_4_BIT, __VA_ARGS__)
> +#define DEBUG_PRINT_T(...)	debug_print(DEBUG_TIMING_BIT, __VA_ARGS__)
> +
> +static void debug_print(int level, const char *s, ...)
> +{
> +	va_list args;
> +
> +	va_start(args, s);
> +
> +	if (DEBUG & level)
> +		vfprintf(stdout, s, args);
> +	va_end(args);
> +}
> +
> +#ifndef min
> +#define min(x, y) ((x) < (y) ? x : y)
> +#endif
> +
> +#define RETURN_FROM_TEST(_ret) \
> +	do { \
> +		DEBUG_PRINT_L1( \
> +			"\tTest %s returned %d\n", __func__, _ret); \
> +		return _ret; \
> +	} while (0)
> +
> +#define ADI_BLKSZ	64
> +#define ADI_MAX_VERSION	15
> +
> +#define TEST_STEP_FAILURE(_ret) \
> +	do { \
> +		fprintf(stderr, "\tTest step failure: %d at %s:%d\n", \
> +			_ret, __func__, __LINE__); \
> +		goto out; \
> +	} while (0)
> +
> +#define RDTICK(_x) \
> +	asm volatile(" rd %%tick, %0\n" : "=r" (_x))
> +
> +static int random_version(void)
> +{
> +	long tick;
> +
> +	RDTICK(tick);
> +
> +	return tick % (ADI_MAX_VERSION + 1);
> +}
> +
> +#define MAX_RANGES_SUPPORTED	5
> +static const char system_ram_str[] = "System RAM\n";
> +static int range_count;
> +static unsigned long long int start_addr[MAX_RANGES_SUPPORTED];
> +static unsigned long long int   end_addr[MAX_RANGES_SUPPORTED];
> +
> +struct stats {
> +	char		name[16];
> +	unsigned long	total;
> +	unsigned long	count;
> +	unsigned long	bytes;
> +};
> +
> +static struct stats read_stats = {
> +	.name = "read", .total = 0, .count = 0, .bytes = 0};
> +static struct stats pread_stats = {
> +	.name = "pread", .total = 0, .count = 0, .bytes = 0};
> +static struct stats write_stats = {
> +	.name = "write", .total = 0, .count = 0, .bytes = 0};
> +static struct stats pwrite_stats = {
> +	.name = "pwrite", .total = 0, .count = 0, .bytes = 0};
> +static struct stats seek_stats = {
> +	.name = "seek", .total = 0, .count = 0, .bytes = 0};
> +
> +static void update_stats(struct stats * const ustats,
> +			 unsigned long measurement, unsigned long bytes)
> +{
> +	ustats->total += measurement;
> +	ustats->bytes += bytes;
> +	ustats->count++;
> +}
> +
> +static void print_ustats(const struct stats * const ustats)
> +{
> +	DEBUG_PRINT_L1("%s\t%7d\t%7.0f\t%7.0f\n",
> +		       ustats->name, ustats->count,
> +		       (float)ustats->total / (float)ustats->count,
> +		       (float)ustats->bytes / (float)ustats->count);
> +}
> +
> +static void print_stats(void)
> +{
> +	DEBUG_PRINT_L1("\nSyscall\tCall\tAvgTime\tAvgSize\n"
> +		       "\tCount\t(ticks)\t(bytes)\n"
> +		       "-------------------------------\n");
> +
> +	print_ustats(&read_stats);
> +	print_ustats(&pread_stats);
> +	print_ustats(&write_stats);
> +	print_ustats(&pwrite_stats);
> +	print_ustats(&seek_stats);
> +}
> +
> +static int build_memory_map(void)
> +{
> +	char line[256];
> +	FILE *fp;
> +	int i;
> +
> +	range_count = 0;
> +
> +	fp = fopen("/proc/iomem", "r");
> +	if (!fp) {
> +		fprintf(stderr, "/proc/iomem: error %d: %s\n",
> +			errno, strerror(errno));
> +		return -errno;
> +	}

A second error message gets printed from main() - maybe you want to
suppress one of them.

> +
> +	while (fgets(line, sizeof(line), fp) != 0) {
> +		if (strstr(line, system_ram_str)) {
> +			char *dash, *end_ptr;
> +
> +			/* Given a line like this:
> +			 * d0400000-10ffaffff : System RAM
> +			 * replace the "-" with a space
> +			 */
> +			dash = strstr(line, "-");
> +			dash[0] = 0x20;
> +
> +			start_addr[range_count] = strtoull(line, &end_ptr, 16);
> +			end_addr[range_count] = strtoull(end_ptr, NULL, 16);
> +			range_count++;
> +		}
> +	}
> +
> +	fclose(fp);
> +
> +	DEBUG_PRINT_L1("RAM Ranges\n");
> +	for (i = 0; i < range_count; i++)
> +		DEBUG_PRINT_L1("\trange %d: 0x%llx\t- 0x%llx\n",
> +			       i, start_addr[i], end_addr[i]);
> +
> +	if (range_count == 0)
> +		return -1;

Is this an error at this point? If so printing an error here makes sense as opposed
from the main().

> +
> +	return 0;
> +}
> +
> +static int read_adi(int fd, unsigned char *buf, int buf_sz)
> +{
> +	int ret, bytes_read = 0;
> +	long start, end, elapsed_time = 0;
> +
> +	do {
> +		RDTICK(start);
> +		ret = read(fd, buf + bytes_read, buf_sz - bytes_read);
> +		RDTICK(end);
> +		if (ret < 0)
> +			return -errno;
> +
> +		elapsed_time += end - start;
> +		update_stats(&read_stats, elapsed_time, buf_sz);
> +		bytes_read += ret;
> +
> +	} while (bytes_read < buf_sz);
> +
> +	DEBUG_PRINT_T("\tread elapsed timed = %ld\n", elapsed_time);
> +	DEBUG_PRINT_L3("\tRead  %d bytes\n", bytes_read);
> +
> +	return bytes_read;
> +}
> +
> +static int pread_adi(int fd, unsigned char *buf,
> +		     int buf_sz, unsigned long offset)
> +{
> +	int ret, i, bytes_read = 0;
> +	unsigned long cur_offset;
> +	long start, end, elapsed_time = 0;
> +
> +	cur_offset = offset;
> +	do {
> +		RDTICK(start);
> +		ret = pread(fd, buf + bytes_read, buf_sz - bytes_read,
> +			    cur_offset);
> +		RDTICK(end);
> +		if (ret < 0)
> +			return -errno;
> +
> +		elapsed_time += end - start;
> +		update_stats(&pread_stats, elapsed_time, buf_sz);
> +		bytes_read += ret;
> +		cur_offset += ret;
> +
> +	} while (bytes_read < buf_sz);
> +
> +	DEBUG_PRINT_T("\tpread elapsed timed = %ld\n", elapsed_time);
> +	DEBUG_PRINT_L3("\tRead  %d bytes starting at offset 0x%lx\n",
> +		       bytes_read, offset);
> +	for (i = 0; i < bytes_read; i++)
> +		DEBUG_PRINT_L4("\t\t0x%lx\t%d\n", offset + i, buf[i]);
> +
> +	return bytes_read;
> +}
> +
> +static int write_adi(int fd, const unsigned char * const buf, int buf_sz)
> +{
> +	int ret, bytes_written = 0;
> +	long start, end, elapsed_time = 0;
> +
> +	do {
> +		RDTICK(start);
> +		ret = write(fd, buf + bytes_written, buf_sz - bytes_written);
> +		RDTICK(end);
> +		if (ret < 0)
> +			return -errno;
> +
> +		elapsed_time += (end - start);
> +		update_stats(&write_stats, elapsed_time, buf_sz);
> +		bytes_written += ret;
> +	} while (bytes_written < buf_sz);
> +
> +	DEBUG_PRINT_T("\twrite elapsed timed = %ld\n", elapsed_time);
> +	DEBUG_PRINT_L3("\tWrote %d of %d bytes\n", bytes_written, buf_sz);
> +
> +	return bytes_written;
> +}
> +
> +static int pwrite_adi(int fd, const unsigned char * const buf,
> +		      int buf_sz, unsigned long offset)
> +{
> +	int ret, bytes_written = 0;
> +	unsigned long cur_offset;
> +	long start, end, elapsed_time = 0;
> +
> +	cur_offset = offset;
> +
> +	do {
> +		RDTICK(start);
> +		ret = pwrite(fd, buf + bytes_written,
> +			     buf_sz - bytes_written, cur_offset);
> +		RDTICK(end);
> +		if (ret < 0) {
> +			fprintf(stderr, "pwrite(): error %d: %s\n",
> +				errno, strerror(errno));
> +			return -errno;
> +		}
> +
> +		elapsed_time += (end - start);
> +		update_stats(&pwrite_stats, elapsed_time, buf_sz);
> +		bytes_written += ret;
> +		cur_offset += ret;
> +
> +	} while (bytes_written < buf_sz);
> +
> +	DEBUG_PRINT_T("\tpwrite elapsed timed = %ld\n", elapsed_time);
> +	DEBUG_PRINT_L3("\tWrote %d of %d bytes starting at address 0x%lx\n",
> +		       bytes_written, buf_sz, offset);
> +
> +	return bytes_written;
> +}
> +
> +static off_t seek_adi(int fd, off_t offset, int whence)
> +{
> +	long start, end;
> +	off_t ret;
> +
> +	RDTICK(start);
> +	ret = lseek(fd, offset, whence);
> +	RDTICK(end);
> +	DEBUG_PRINT_L2("\tlseek ret = 0x%llx\n", ret);
> +	if (ret < 0)
> +		goto out;
> +
> +	DEBUG_PRINT_T("\tlseek elapsed timed = %ld\n", end - start);
> +	update_stats(&seek_stats, end - start, 0);
> +
> +out:
> +	(void)lseek(fd, 0, SEEK_END);
> +	return ret;
> +}
> +
> +static int test0_prpw_aligned_1byte(int fd)
> +{
> +	/* somewhat arbitrarily chosen address */
> +	unsigned long paddr =
> +		(end_addr[range_count - 1] - 0x1000) & ~(ADI_BLKSZ - 1);
> +	unsigned char version[1], expected_version;
> +	loff_t offset;
> +	int ret;
> +
> +	version[0] = random_version();
> +	expected_version = version[0];
> +
> +	offset = paddr / ADI_BLKSZ;
> +
> +	ret = pwrite_adi(fd, version, sizeof(version), offset);
> +	if (ret != sizeof(version))
> +		TEST_STEP_FAILURE(ret);
> +
> +	ret = pread_adi(fd, version, sizeof(version), offset);
> +	if (ret != sizeof(version))
> +		TEST_STEP_FAILURE(ret);
> +
> +	if (expected_version != version[0]) {
> +		DEBUG_PRINT_L2("\tExpected version %d but read version %d\n",
> +			       expected_version, version[0]);
> +		TEST_STEP_FAILURE(-expected_version);
> +	}
> +
> +	ret = 0;
> +out:
> +	RETURN_FROM_TEST(ret);
> +}
> +
> +#define TEST1_VERSION_SZ	4096
> +static int test1_prpw_aligned_4096bytes(int fd)
> +{
> +	/* somewhat arbitrarily chosen address */
> +	unsigned long paddr =
> +		(end_addr[range_count - 1] - 0x6000) & ~(ADI_BLKSZ - 1);
> +	unsigned char version[TEST1_VERSION_SZ],
> +		expected_version[TEST1_VERSION_SZ];
> +	loff_t offset;
> +	int ret, i;
> +
> +	for (i = 0; i < TEST1_VERSION_SZ; i++) {
> +		version[i] = random_version();
> +		expected_version[i] = version[i];
> +	}
> +
> +	offset = paddr / ADI_BLKSZ;
> +
> +	ret = pwrite_adi(fd, version, sizeof(version), offset);
> +	if (ret != sizeof(version))
> +		TEST_STEP_FAILURE(ret);
> +
> +	ret = pread_adi(fd, version, sizeof(version), offset);
> +	if (ret != sizeof(version))
> +		TEST_STEP_FAILURE(ret);
> +
> +	for (i = 0; i < TEST1_VERSION_SZ; i++) {
> +		if (expected_version[i] != version[i]) {
> +			DEBUG_PRINT_L2(
> +				"\tExpected version %d but read version %d\n",
> +				expected_version, version[0]);
> +			TEST_STEP_FAILURE(-expected_version[i]);
> +		}
> +	}
> +
> +	ret = 0;
> +out:
> +	RETURN_FROM_TEST(ret);
> +}
> +
> +#define TEST2_VERSION_SZ	10327
> +static int test2_prpw_aligned_10327bytes(int fd)
> +{
> +	/* somewhat arbitrarily chosen address */
> +	unsigned long paddr =
> +		(start_addr[0] + 0x6000) & ~(ADI_BLKSZ - 1);
> +	unsigned char version[TEST2_VERSION_SZ],
> +		expected_version[TEST2_VERSION_SZ];
> +	loff_t offset;
> +	int ret, i;
> +
> +	for (i = 0; i < TEST2_VERSION_SZ; i++) {
> +		version[i] = random_version();
> +		expected_version[i] = version[i];
> +	}
> +
> +	offset = paddr / ADI_BLKSZ;
> +
> +	ret = pwrite_adi(fd, version, sizeof(version), offset);
> +	if (ret != sizeof(version))
> +		TEST_STEP_FAILURE(ret);
> +
> +	ret = pread_adi(fd, version, sizeof(version), offset);
> +	if (ret != sizeof(version))
> +		TEST_STEP_FAILURE(ret);
> +
> +	for (i = 0; i < TEST2_VERSION_SZ; i++) {
> +		if (expected_version[i] != version[i]) {
> +			DEBUG_PRINT_L2(
> +				"\tExpected version %d but read version %d\n",
> +				expected_version, version[0]);
> +			TEST_STEP_FAILURE(-expected_version[i]);
> +		}
> +	}
> +
> +	ret = 0;
> +out:
> +	RETURN_FROM_TEST(ret);
> +}
> +
> +#define TEST3_VERSION_SZ	12541
> +static int test3_prpw_unaligned_12541bytes(int fd)
> +{
> +	/* somewhat arbitrarily chosen address */
> +	unsigned long paddr =
> +		((start_addr[0] + 0xC000) & ~(ADI_BLKSZ - 1)) + 17;
> +	unsigned char version[TEST3_VERSION_SZ],
> +		expected_version[TEST3_VERSION_SZ];
> +	loff_t offset;
> +	int ret, i;
> +
> +	for (i = 0; i < TEST3_VERSION_SZ; i++) {
> +		version[i] = random_version();
> +		expected_version[i] = version[i];
> +	}
> +
> +	offset = paddr / ADI_BLKSZ;
> +
> +	ret = pwrite_adi(fd, version, sizeof(version), offset);
> +	if (ret != sizeof(version))
> +		TEST_STEP_FAILURE(ret);
> +
> +	ret = pread_adi(fd, version, sizeof(version), offset);
> +	if (ret != sizeof(version))
> +		TEST_STEP_FAILURE(ret);
> +
> +	for (i = 0; i < TEST3_VERSION_SZ; i++) {
> +		if (expected_version[i] != version[i]) {
> +			DEBUG_PRINT_L2(
> +				"\tExpected version %d but read version %d\n",
> +				expected_version, version[0]);
> +			TEST_STEP_FAILURE(-expected_version[i]);
> +		}
> +	}
> +
> +	ret = 0;
> +out:
> +	RETURN_FROM_TEST(ret);
> +}
> +
> +static int test4_lseek(int fd)
> +{
> +#define	OFFSET_ADD	(0x100)
> +#define OFFSET_SUBTRACT	(0xFFFFFFF000000000)
> +
> +	off_t offset_out, offset_in;
> +	int ret;
> +
> +
> +	offset_in = 0x123456789abcdef0;
> +	offset_out = seek_adi(fd, offset_in, SEEK_SET);
> +	if (offset_out != offset_in) {
> +		ret = -1;
> +		TEST_STEP_FAILURE(ret);
> +	}
> +
> +	/* seek to the current offset.  this should return EINVAL */
> +	offset_out = seek_adi(fd, offset_in, SEEK_SET);
> +	if (offset_out < 0 && errno == EINVAL)
> +		DEBUG_PRINT_L2(
> +			"\tSEEK_SET failed as designed. Not an error\n");
> +	else {
> +		ret = -2;
> +		TEST_STEP_FAILURE(ret);
> +	}
> +
> +	offset_out = seek_adi(fd, 0, SEEK_CUR);
> +	if (offset_out != offset_in) {
> +		ret = -3;
> +		TEST_STEP_FAILURE(ret);
> +	}
> +
> +	offset_out = seek_adi(fd, OFFSET_ADD, SEEK_CUR);
> +	if (offset_out != (offset_in + OFFSET_ADD)) {
> +		ret = -4;
> +		TEST_STEP_FAILURE(ret);
> +	}
> +
> +	offset_out = seek_adi(fd, OFFSET_SUBTRACT, SEEK_CUR);
> +	if (offset_out != (offset_in + OFFSET_ADD + OFFSET_SUBTRACT)) {
> +		ret = -5;
> +		TEST_STEP_FAILURE(ret);
> +	}
> +
> +	ret = 0;
> +out:
> +	RETURN_FROM_TEST(ret);
> +}
> +
> +static int test5_rw_aligned_1byte(int fd)
> +{
> +	/* somewhat arbitrarily chosen address */
> +	unsigned long paddr =
> +		(end_addr[range_count - 1] - 0xF000) & ~(ADI_BLKSZ - 1);
> +	unsigned char version, expected_version;
> +	loff_t offset;
> +	off_t oret;
> +	int ret;
> +
> +	offset = paddr / ADI_BLKSZ;
> +	version = expected_version = random_version();
> +
> +	oret = seek_adi(fd, offset, SEEK_SET);
> +	if (oret != offset) {
> +		ret = -1;
> +		TEST_STEP_FAILURE(ret);
> +	}
> +
> +	ret = write_adi(fd, &version, sizeof(version));
> +	if (ret != sizeof(version))
> +		TEST_STEP_FAILURE(ret);
> +
> +	oret = seek_adi(fd, offset, SEEK_SET);
> +	if (oret != offset) {
> +		ret = -1;
> +		TEST_STEP_FAILURE(ret);
> +	}
> +
> +	ret = read_adi(fd, &version, sizeof(version));
> +	if (ret != sizeof(version))
> +		TEST_STEP_FAILURE(ret);
> +
> +	if (expected_version != version) {
> +		DEBUG_PRINT_L2("\tExpected version %d but read version %d\n",
> +			       expected_version, version);
> +		TEST_STEP_FAILURE(-expected_version);
> +	}
> +
> +	ret = 0;
> +out:
> +	RETURN_FROM_TEST(ret);
> +}
> +
> +#define TEST6_VERSION_SZ        9434
> +static int test6_rw_aligned_9434bytes(int fd)
> +{
> +	/* somewhat arbitrarily chosen address */
> +	unsigned long paddr =
> +		(end_addr[range_count - 1] - 0x5F000) & ~(ADI_BLKSZ - 1);
> +	unsigned char version[TEST6_VERSION_SZ],
> +		      expected_version[TEST6_VERSION_SZ];
> +	loff_t offset;
> +	off_t oret;
> +	int ret, i;
> +
> +	offset = paddr / ADI_BLKSZ;
> +	for (i = 0; i < TEST6_VERSION_SZ; i++)
> +		version[i] = expected_version[i] = random_version();
> +
> +	oret = seek_adi(fd, offset, SEEK_SET);
> +	if (oret != offset) {
> +		ret = -1;
> +		TEST_STEP_FAILURE(ret);
> +	}
> +
> +	ret = write_adi(fd, version, sizeof(version));
> +	if (ret != sizeof(version))
> +		TEST_STEP_FAILURE(ret);
> +
> +	memset(version, 0, TEST6_VERSION_SZ);
> +
> +	oret = seek_adi(fd, offset, SEEK_SET);
> +	if (oret != offset) {
> +		ret = -1;
> +		TEST_STEP_FAILURE(ret);
> +	}
> +
> +	ret = read_adi(fd, version, sizeof(version));
> +	if (ret != sizeof(version))
> +		TEST_STEP_FAILURE(ret);
> +
> +	for (i = 0; i < TEST6_VERSION_SZ; i++) {
> +		if (expected_version[i] != version[i]) {
> +			DEBUG_PRINT_L2(
> +				"\tExpected version %d but read version %d\n",
> +				expected_version[i], version[i]);
> +			TEST_STEP_FAILURE(-expected_version[i]);
> +		}
> +	}
> +
> +	ret = 0;
> +out:
> +	RETURN_FROM_TEST(ret);
> +}
> +
> +#define TEST7_VERSION_SZ        14963
> +static int test7_rw_aligned_14963bytes(int fd)
> +{
> +	/* somewhat arbitrarily chosen address */
> +	unsigned long paddr =
> +	  ((start_addr[range_count - 1] + 0xF000) & ~(ADI_BLKSZ - 1)) + 39;
> +	unsigned char version[TEST7_VERSION_SZ],
> +		      expected_version[TEST7_VERSION_SZ];
> +	loff_t offset;
> +	off_t oret;
> +	int ret, i;
> +
> +	offset = paddr / ADI_BLKSZ;
> +	for (i = 0; i < TEST7_VERSION_SZ; i++) {
> +		version[i] = random_version();
> +		expected_version[i] = version[i];
> +	}
> +
> +	oret = seek_adi(fd, offset, SEEK_SET);
> +	if (oret != offset) {
> +		ret = -1;
> +		TEST_STEP_FAILURE(ret);
> +	}
> +
> +	ret = write_adi(fd, version, sizeof(version));
> +	if (ret != sizeof(version))
> +		TEST_STEP_FAILURE(ret);
> +
> +	memset(version, 0, TEST7_VERSION_SZ);
> +
> +	oret = seek_adi(fd, offset, SEEK_SET);
> +	if (oret != offset) {
> +		ret = -1;
> +		TEST_STEP_FAILURE(ret);
> +	}
> +
> +	ret = read_adi(fd, version, sizeof(version));
> +	if (ret != sizeof(version))
> +		TEST_STEP_FAILURE(ret);
> +
> +	for (i = 0; i < TEST7_VERSION_SZ; i++) {
> +		if (expected_version[i] != version[i]) {
> +			DEBUG_PRINT_L2(
> +				"\tExpected version %d but read version %d\n",
> +				expected_version[i], version[i]);
> +			TEST_STEP_FAILURE(-expected_version[i]);
> +		}
> +
> +		paddr += ADI_BLKSZ;
> +	}
> +
> +	ret = 0;
> +out:
> +	RETURN_FROM_TEST(ret);
> +}
> +
> +static int (*tests[])(int fd) = {
> +	test0_prpw_aligned_1byte,
> +	test1_prpw_aligned_4096bytes,
> +	test2_prpw_aligned_10327bytes,
> +	test3_prpw_unaligned_12541bytes,
> +	test4_lseek,
> +	test5_rw_aligned_1byte,
> +	test6_rw_aligned_9434bytes,
> +	test7_rw_aligned_14963bytes,
> +};
> +#define TEST_COUNT	ARRAY_SIZE(tests)
> +
> +int main(int argc, char *argv[])
> +{
> +	int fd, ret, test, failure_count = 0;
> +
> +	ret = build_memory_map();
> +	if (ret < 0) {
> +		fprintf(stderr, "build: error %d: %s\n",
> +			errno, strerror(errno));

This error message is confusing - also is errno valid in all return
cases from build_memory_map(). I noticed one where it might not be.

> +		return -errno;
> +	}
> +
> +	fd = open("/dev/adi", O_RDWR);
> +	if (fd < 0) {
> +		fprintf(stderr, "open: error %d: %s\n",
> +			errno, strerror(errno));
> +		return -errno;
> +	}

If adi driver isn't loaded which would be the case in majority of the
cases, the test will fail. To make sure the test runs when kselftest
is run, you will have to do modprobe. A lot of the module tests do
that. A good example is bpf/test_kmod.sh

> +
> +	for (test = 0; test < TEST_COUNT; test++) {
> +		DEBUG_PRINT_L1("Running test #%d\n", test);
> +
> +		ret = (*tests[test])(fd);
> +		if (ret != 0) {
> +			fprintf(stderr, "Test #%d failed: error %d\n",
> +				test, ret);
> +			failure_count++;
> +		}

It is useful to keep track of number of tests that passed. You can use
ksft_* interfaces for pass/fail/skip counts. ksft_test_result_fail()
and ksft_test_result_pass() will do the work for you.

> +	}
> +
> +	print_stats();
> +
> +	fprintf(stdout, "\nRan %ld tests\n", TEST_COUNT);
> +	if (failure_count)
> +		fprintf(stdout, "%d tests failed\n", failure_count);
> +	else
> +		fprintf(stdout, "All tests passed\n");

Same comment as above except in this case, ksft_exit_pass() and
ksft_exit_fail() are the ones to use.

> +
> +	close(fd);

In which case, close(fd) moves up before the ksft_*() calls.

> +	return -failure_count;


> +}
> 

thanks,
-- Shuah

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