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* [PATCH v2 0/3] selftests: vdso: Add a selftest for vDSO getcpu()
@ 2020-05-21 20:37 Mark Brown
  2020-05-21 20:37 ` [PATCH v2 1/3] selftests: vdso: Rename vdso_test to vdso_test_gettimeofday Mark Brown
                   ` (2 more replies)
  0 siblings, 3 replies; 5+ messages in thread
From: Mark Brown @ 2020-05-21 20:37 UTC (permalink / raw)
  To: Shuah Khan; +Cc: linux-kernel, linux-kselftest, Mark Brown

This series does a bit of a cleanup of the existing tests for the vDSO
in kselftest and then adds a new test for getcpu().

v2: Silence checkpatch

Mark Brown (3):
  selftests: vdso: Rename vdso_test to vdso_test_gettimeofday
  selftests: vdso: Use a header file to prototype parse_vdso API
  selftests: vdso: Add a selftest for vDSO getcpu()

 tools/testing/selftests/vDSO/.gitignore       |  2 +
 tools/testing/selftests/vDSO/Makefile         |  5 +-
 tools/testing/selftests/vDSO/parse_vdso.c     | 24 +--------
 tools/testing/selftests/vDSO/parse_vdso.h     | 31 +++++++++++
 .../selftests/vDSO/vdso_standalone_test_x86.c |  4 +-
 .../testing/selftests/vDSO/vdso_test_getcpu.c | 54 +++++++++++++++++++
 .../{vdso_test.c => vdso_test_gettimeofday.c} | 10 ++--
 7 files changed, 96 insertions(+), 34 deletions(-)
 create mode 100644 tools/testing/selftests/vDSO/parse_vdso.h
 create mode 100644 tools/testing/selftests/vDSO/vdso_test_getcpu.c
 rename tools/testing/selftests/vDSO/{vdso_test.c => vdso_test_gettimeofday.c} (84%)

-- 
2.20.1


^ permalink raw reply	[flat|nested] 5+ messages in thread

* [PATCH v2 1/3] selftests: vdso: Rename vdso_test to vdso_test_gettimeofday
  2020-05-21 20:37 [PATCH v2 0/3] selftests: vdso: Add a selftest for vDSO getcpu() Mark Brown
@ 2020-05-21 20:37 ` Mark Brown
  2020-05-21 20:37 ` [PATCH v2 2/3] selftests: vdso: Use a header file to prototype parse_vdso API Mark Brown
  2020-05-21 20:37 ` [PATCH v2 3/3] selftests: vdso: Add a selftest for vDSO getcpu() Mark Brown
  2 siblings, 0 replies; 5+ messages in thread
From: Mark Brown @ 2020-05-21 20:37 UTC (permalink / raw)
  To: Shuah Khan; +Cc: linux-kernel, linux-kselftest, Mark Brown

Currently the vDSO kselftests have a test called vdso_test which tests
the vDSO implementation of gettimeofday(). In preparation for adding
tests for other vDSO functionality rename this test to reflect what's
going on.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
 tools/testing/selftests/vDSO/.gitignore                      | 1 +
 tools/testing/selftests/vDSO/Makefile                        | 4 ++--
 .../selftests/vDSO/{vdso_test.c => vdso_test_gettimeofday.c} | 5 +++--
 3 files changed, 6 insertions(+), 4 deletions(-)
 rename tools/testing/selftests/vDSO/{vdso_test.c => vdso_test_gettimeofday.c} (89%)

diff --git a/tools/testing/selftests/vDSO/.gitignore b/tools/testing/selftests/vDSO/.gitignore
index 382cfb39a1a3..74f49bd5f6dd 100644
--- a/tools/testing/selftests/vDSO/.gitignore
+++ b/tools/testing/selftests/vDSO/.gitignore
@@ -1,3 +1,4 @@
 # SPDX-License-Identifier: GPL-2.0-only
 vdso_test
+vdso_test_gettimeofday
 vdso_standalone_test_x86
diff --git a/tools/testing/selftests/vDSO/Makefile b/tools/testing/selftests/vDSO/Makefile
index 9e03d61f52fd..ae15d700b62e 100644
--- a/tools/testing/selftests/vDSO/Makefile
+++ b/tools/testing/selftests/vDSO/Makefile
@@ -4,7 +4,7 @@ include ../lib.mk
 uname_M := $(shell uname -m 2>/dev/null || echo not)
 ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/)
 
-TEST_GEN_PROGS := $(OUTPUT)/vdso_test
+TEST_GEN_PROGS := $(OUTPUT)/vdso_test_gettimeofday
 ifeq ($(ARCH),x86)
 TEST_GEN_PROGS += $(OUTPUT)/vdso_standalone_test_x86
 endif
@@ -17,7 +17,7 @@ LDLIBS += -lgcc_s
 endif
 
 all: $(TEST_GEN_PROGS)
-$(OUTPUT)/vdso_test: parse_vdso.c vdso_test.c
+$(OUTPUT)/vdso_test_gettimeofday: parse_vdso.c vdso_test_gettimeofday.c
 $(OUTPUT)/vdso_standalone_test_x86: vdso_standalone_test_x86.c parse_vdso.c
 	$(CC) $(CFLAGS) $(CFLAGS_vdso_standalone_test_x86) \
 		vdso_standalone_test_x86.c parse_vdso.c \
diff --git a/tools/testing/selftests/vDSO/vdso_test.c b/tools/testing/selftests/vDSO/vdso_test_gettimeofday.c
similarity index 89%
rename from tools/testing/selftests/vDSO/vdso_test.c
rename to tools/testing/selftests/vDSO/vdso_test_gettimeofday.c
index 719d5a6bd664..511c0dc5e47e 100644
--- a/tools/testing/selftests/vDSO/vdso_test.c
+++ b/tools/testing/selftests/vDSO/vdso_test_gettimeofday.c
@@ -1,10 +1,11 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * vdso_test.c: Sample code to test parse_vdso.c
+ * vdso_test_gettimeofday.c: Sample code to test parse_vdso.c and
+ *                           vDSO gettimeofday()
  * Copyright (c) 2014 Andy Lutomirski
  *
  * Compile with:
- * gcc -std=gnu99 vdso_test.c parse_vdso.c
+ * gcc -std=gnu99 vdso_test_gettimeofday.c parse_vdso_gettimeofday.c
  *
  * Tested on x86, 32-bit and 64-bit.  It may work on other architectures, too.
  */
-- 
2.20.1


^ permalink raw reply	[flat|nested] 5+ messages in thread

* [PATCH v2 2/3] selftests: vdso: Use a header file to prototype parse_vdso API
  2020-05-21 20:37 [PATCH v2 0/3] selftests: vdso: Add a selftest for vDSO getcpu() Mark Brown
  2020-05-21 20:37 ` [PATCH v2 1/3] selftests: vdso: Rename vdso_test to vdso_test_gettimeofday Mark Brown
@ 2020-05-21 20:37 ` Mark Brown
  2020-05-22 15:48   ` shuah
  2020-05-21 20:37 ` [PATCH v2 3/3] selftests: vdso: Add a selftest for vDSO getcpu() Mark Brown
  2 siblings, 1 reply; 5+ messages in thread
From: Mark Brown @ 2020-05-21 20:37 UTC (permalink / raw)
  To: Shuah Khan; +Cc: linux-kernel, linux-kselftest, Mark Brown

Both vdso_test_gettimeofday and vdso_standalone_test_x86 use the library in
parse_vdso.c but each separately declares the API it offers which is not
ideal. Create a header file with prototypes of the functions and use it in
both the library and the tests to ensure that the same prototypes are used
throughout.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
 tools/testing/selftests/vDSO/parse_vdso.c     | 24 +-------------
 tools/testing/selftests/vDSO/parse_vdso.h     | 31 +++++++++++++++++++
 .../selftests/vDSO/vdso_standalone_test_x86.c |  4 +--
 .../selftests/vDSO/vdso_test_gettimeofday.c   |  5 +--
 4 files changed, 34 insertions(+), 30 deletions(-)
 create mode 100644 tools/testing/selftests/vDSO/parse_vdso.h

diff --git a/tools/testing/selftests/vDSO/parse_vdso.c b/tools/testing/selftests/vDSO/parse_vdso.c
index 1dbb4b87268f..413f75620a35 100644
--- a/tools/testing/selftests/vDSO/parse_vdso.c
+++ b/tools/testing/selftests/vDSO/parse_vdso.c
@@ -21,29 +21,7 @@
 #include <limits.h>
 #include <elf.h>
 
-/*
- * To use this vDSO parser, first call one of the vdso_init_* functions.
- * If you've already parsed auxv, then pass the value of AT_SYSINFO_EHDR
- * to vdso_init_from_sysinfo_ehdr.  Otherwise pass auxv to vdso_init_from_auxv.
- * Then call vdso_sym for each symbol you want.  For example, to look up
- * gettimeofday on x86_64, use:
- *
- *     <some pointer> = vdso_sym("LINUX_2.6", "gettimeofday");
- * or
- *     <some pointer> = vdso_sym("LINUX_2.6", "__vdso_gettimeofday");
- *
- * vdso_sym will return 0 if the symbol doesn't exist or if the init function
- * failed or was not called.  vdso_sym is a little slow, so its return value
- * should be cached.
- *
- * vdso_sym is threadsafe; the init functions are not.
- *
- * These are the prototypes:
- */
-extern void vdso_init_from_auxv(void *auxv);
-extern void vdso_init_from_sysinfo_ehdr(uintptr_t base);
-extern void *vdso_sym(const char *version, const char *name);
-
+#include "parse_vdso.h"
 
 /* And here's the code. */
 #ifndef ELF_BITS
diff --git a/tools/testing/selftests/vDSO/parse_vdso.h b/tools/testing/selftests/vDSO/parse_vdso.h
new file mode 100644
index 000000000000..ea4b8635bb0b
--- /dev/null
+++ b/tools/testing/selftests/vDSO/parse_vdso.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef PARSE_VDSO_H
+#define PARSE_VDSO_H
+
+#include <stdint.h>
+
+/*
+ * To use this vDSO parser, first call one of the vdso_init_* functions.
+ * If you've already parsed auxv, then pass the value of AT_SYSINFO_EHDR
+ * to vdso_init_from_sysinfo_ehdr.  Otherwise pass auxv to vdso_init_from_auxv.
+ * Then call vdso_sym for each symbol you want.  For example, to look up
+ * gettimeofday on x86_64, use:
+ *
+ *     <some pointer> = vdso_sym("LINUX_2.6", "gettimeofday");
+ * or
+ *     <some pointer> = vdso_sym("LINUX_2.6", "__vdso_gettimeofday");
+ *
+ * vdso_sym will return 0 if the symbol doesn't exist or if the init function
+ * failed or was not called.  vdso_sym is a little slow, so its return value
+ * should be cached.
+ *
+ * vdso_sym is threadsafe; the init functions are not.
+ *
+ * These are the prototypes:
+ */
+extern void *vdso_sym(const char *version, const char *name);
+extern void vdso_init_from_sysinfo_ehdr(uintptr_t base);
+extern void vdso_init_from_auxv(void *auxv);
+
+#endif
diff --git a/tools/testing/selftests/vDSO/vdso_standalone_test_x86.c b/tools/testing/selftests/vDSO/vdso_standalone_test_x86.c
index 5ac4b00acfbc..8a44ff973ee1 100644
--- a/tools/testing/selftests/vDSO/vdso_standalone_test_x86.c
+++ b/tools/testing/selftests/vDSO/vdso_standalone_test_x86.c
@@ -16,9 +16,7 @@
 #include <unistd.h>
 #include <stdint.h>
 
-extern void *vdso_sym(const char *version, const char *name);
-extern void vdso_init_from_sysinfo_ehdr(uintptr_t base);
-extern void vdso_init_from_auxv(void *auxv);
+#include "parse_vdso.h"
 
 /* We need a libc functions... */
 int strcmp(const char *a, const char *b)
diff --git a/tools/testing/selftests/vDSO/vdso_test_gettimeofday.c b/tools/testing/selftests/vDSO/vdso_test_gettimeofday.c
index 511c0dc5e47e..8ccc73ed8240 100644
--- a/tools/testing/selftests/vDSO/vdso_test_gettimeofday.c
+++ b/tools/testing/selftests/vDSO/vdso_test_gettimeofday.c
@@ -17,10 +17,7 @@
 #include <sys/time.h>
 
 #include "../kselftest.h"
-
-extern void *vdso_sym(const char *version, const char *name);
-extern void vdso_init_from_sysinfo_ehdr(uintptr_t base);
-extern void vdso_init_from_auxv(void *auxv);
+#include "parse_vdso.h"
 
 /*
  * ARM64's vDSO exports its gettimeofday() implementation with a different
-- 
2.20.1


^ permalink raw reply	[flat|nested] 5+ messages in thread

* [PATCH v2 3/3] selftests: vdso: Add a selftest for vDSO getcpu()
  2020-05-21 20:37 [PATCH v2 0/3] selftests: vdso: Add a selftest for vDSO getcpu() Mark Brown
  2020-05-21 20:37 ` [PATCH v2 1/3] selftests: vdso: Rename vdso_test to vdso_test_gettimeofday Mark Brown
  2020-05-21 20:37 ` [PATCH v2 2/3] selftests: vdso: Use a header file to prototype parse_vdso API Mark Brown
@ 2020-05-21 20:37 ` Mark Brown
  2 siblings, 0 replies; 5+ messages in thread
From: Mark Brown @ 2020-05-21 20:37 UTC (permalink / raw)
  To: Shuah Khan; +Cc: linux-kernel, linux-kselftest, Mark Brown

Provide a very basic selftest for getcpu() which similarly to our existing
test for gettimeofday() looks up the function in the vDSO and prints the
results it gets if the function exists and succeeds.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
 tools/testing/selftests/vDSO/.gitignore       |  1 +
 tools/testing/selftests/vDSO/Makefile         |  3 +-
 .../testing/selftests/vDSO/vdso_test_getcpu.c | 54 +++++++++++++++++++
 3 files changed, 57 insertions(+), 1 deletion(-)
 create mode 100644 tools/testing/selftests/vDSO/vdso_test_getcpu.c

diff --git a/tools/testing/selftests/vDSO/.gitignore b/tools/testing/selftests/vDSO/.gitignore
index 74f49bd5f6dd..5eb64d41e541 100644
--- a/tools/testing/selftests/vDSO/.gitignore
+++ b/tools/testing/selftests/vDSO/.gitignore
@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
 vdso_test
 vdso_test_gettimeofday
+vdso_test_getcpu
 vdso_standalone_test_x86
diff --git a/tools/testing/selftests/vDSO/Makefile b/tools/testing/selftests/vDSO/Makefile
index ae15d700b62e..0069f2f83f86 100644
--- a/tools/testing/selftests/vDSO/Makefile
+++ b/tools/testing/selftests/vDSO/Makefile
@@ -4,7 +4,7 @@ include ../lib.mk
 uname_M := $(shell uname -m 2>/dev/null || echo not)
 ARCH ?= $(shell echo $(uname_M) | sed -e s/i.86/x86/ -e s/x86_64/x86/)
 
-TEST_GEN_PROGS := $(OUTPUT)/vdso_test_gettimeofday
+TEST_GEN_PROGS := $(OUTPUT)/vdso_test_gettimeofday $(OUTPUT)/vdso_test_getcpu
 ifeq ($(ARCH),x86)
 TEST_GEN_PROGS += $(OUTPUT)/vdso_standalone_test_x86
 endif
@@ -18,6 +18,7 @@ endif
 
 all: $(TEST_GEN_PROGS)
 $(OUTPUT)/vdso_test_gettimeofday: parse_vdso.c vdso_test_gettimeofday.c
+$(OUTPUT)/vdso_test_getcpu: parse_vdso.c vdso_test_getcpu.c
 $(OUTPUT)/vdso_standalone_test_x86: vdso_standalone_test_x86.c parse_vdso.c
 	$(CC) $(CFLAGS) $(CFLAGS_vdso_standalone_test_x86) \
 		vdso_standalone_test_x86.c parse_vdso.c \
diff --git a/tools/testing/selftests/vDSO/vdso_test_getcpu.c b/tools/testing/selftests/vDSO/vdso_test_getcpu.c
new file mode 100644
index 000000000000..fc25ede131b8
--- /dev/null
+++ b/tools/testing/selftests/vDSO/vdso_test_getcpu.c
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * vdso_test_getcpu.c: Sample code to test parse_vdso.c and vDSO getcpu()
+ *
+ * Copyright (c) 2020 Arm Ltd
+ */
+
+#include <stdint.h>
+#include <elf.h>
+#include <stdio.h>
+#include <sys/auxv.h>
+#include <sys/time.h>
+
+#include "../kselftest.h"
+#include "parse_vdso.h"
+
+const char *version = "LINUX_2.6";
+const char *name = "__vdso_getcpu";
+
+struct getcpu_cache;
+typedef long (*getcpu_t)(unsigned int *, unsigned int *,
+			 struct getcpu_cache *);
+
+int main(int argc, char **argv)
+{
+	unsigned long sysinfo_ehdr;
+	unsigned int cpu, node;
+	getcpu_t get_cpu;
+	long ret;
+
+	sysinfo_ehdr = getauxval(AT_SYSINFO_EHDR);
+	if (!sysinfo_ehdr) {
+		printf("AT_SYSINFO_EHDR is not present!\n");
+		return KSFT_SKIP;
+	}
+
+	vdso_init_from_sysinfo_ehdr(getauxval(AT_SYSINFO_EHDR));
+
+	get_cpu = (getcpu_t)vdso_sym(version, name);
+	if (!get_cpu) {
+		printf("Could not find %s\n", name);
+		return KSFT_SKIP;
+	}
+
+	ret = get_cpu(&cpu, &node, 0);
+	if (ret == 0) {
+		printf("Running on CPU %u node %u\n", cpu, node);
+	} else {
+		printf("%s failed\n", name);
+		return KSFT_FAIL;
+	}
+
+	return 0;
+}
-- 
2.20.1


^ permalink raw reply	[flat|nested] 5+ messages in thread

* Re: [PATCH v2 2/3] selftests: vdso: Use a header file to prototype parse_vdso API
  2020-05-21 20:37 ` [PATCH v2 2/3] selftests: vdso: Use a header file to prototype parse_vdso API Mark Brown
@ 2020-05-22 15:48   ` shuah
  0 siblings, 0 replies; 5+ messages in thread
From: shuah @ 2020-05-22 15:48 UTC (permalink / raw)
  To: Mark Brown; +Cc: linux-kernel, linux-kselftest, shuah, Shuah Khan

On 5/21/20 2:37 PM, Mark Brown wrote:
> Both vdso_test_gettimeofday and vdso_standalone_test_x86 use the library in
> parse_vdso.c but each separately declares the API it offers which is not
> ideal. Create a header file with prototypes of the functions and use it in
> both the library and the tests to ensure that the same prototypes are used
> throughout.
> 
> Signed-off-by: Mark Brown <broonie@kernel.org>
> ---
>   tools/testing/selftests/vDSO/parse_vdso.c     | 24 +-------------
>   tools/testing/selftests/vDSO/parse_vdso.h     | 31 +++++++++++++++++++
>   .../selftests/vDSO/vdso_standalone_test_x86.c |  4 +--
>   .../selftests/vDSO/vdso_test_gettimeofday.c   |  5 +--
>   4 files changed, 34 insertions(+), 30 deletions(-)
>   create mode 100644 tools/testing/selftests/vDSO/parse_vdso.h
> 
> diff --git a/tools/testing/selftests/vDSO/parse_vdso.c b/tools/testing/selftests/vDSO/parse_vdso.c
> index 1dbb4b87268f..413f75620a35 100644
> --- a/tools/testing/selftests/vDSO/parse_vdso.c
> +++ b/tools/testing/selftests/vDSO/parse_vdso.c
> @@ -21,29 +21,7 @@
>   #include <limits.h>
>   #include <elf.h>
>   
> -/*
> - * To use this vDSO parser, first call one of the vdso_init_* functions.
> - * If you've already parsed auxv, then pass the value of AT_SYSINFO_EHDR
> - * to vdso_init_from_sysinfo_ehdr.  Otherwise pass auxv to vdso_init_from_auxv.
> - * Then call vdso_sym for each symbol you want.  For example, to look up
> - * gettimeofday on x86_64, use:
> - *
> - *     <some pointer> = vdso_sym("LINUX_2.6", "gettimeofday");
> - * or
> - *     <some pointer> = vdso_sym("LINUX_2.6", "__vdso_gettimeofday");
> - *
> - * vdso_sym will return 0 if the symbol doesn't exist or if the init function
> - * failed or was not called.  vdso_sym is a little slow, so its return value
> - * should be cached.
> - *
> - * vdso_sym is threadsafe; the init functions are not.
> - *
> - * These are the prototypes:
> - */
> -extern void vdso_init_from_auxv(void *auxv);
> -extern void vdso_init_from_sysinfo_ehdr(uintptr_t base);
> -extern void *vdso_sym(const char *version, const char *name);
> -
> +#include "parse_vdso.h"
>   
>   /* And here's the code. */
>   #ifndef ELF_BITS
> diff --git a/tools/testing/selftests/vDSO/parse_vdso.h b/tools/testing/selftests/vDSO/parse_vdso.h
> new file mode 100644
> index 000000000000..ea4b8635bb0b
> --- /dev/null
> +++ b/tools/testing/selftests/vDSO/parse_vdso.h
> @@ -0,0 +1,31 @@
> +/* SPDX-License-Identifier: GPL-2.0-only */
> +
> +#ifndef PARSE_VDSO_H
> +#define PARSE_VDSO_H
> +
> +#include <stdint.h>
> +
> +/*
> + * To use this vDSO parser, first call one of the vdso_init_* functions.
> + * If you've already parsed auxv, then pass the value of AT_SYSINFO_EHDR
> + * to vdso_init_from_sysinfo_ehdr.  Otherwise pass auxv to vdso_init_from_auxv.
> + * Then call vdso_sym for each symbol you want.  For example, to look up
> + * gettimeofday on x86_64, use:
> + *
> + *     <some pointer> = vdso_sym("LINUX_2.6", "gettimeofday");
> + * or
> + *     <some pointer> = vdso_sym("LINUX_2.6", "__vdso_gettimeofday");
> + *
> + * vdso_sym will return 0 if the symbol doesn't exist or if the init function
> + * failed or was not called.  vdso_sym is a little slow, so its return value
> + * should be cached.
> + *
> + * vdso_sym is threadsafe; the init functions are not.
> + *
> + * These are the prototypes:
> + */
> +extern void *vdso_sym(const char *version, const char *name);
> +extern void vdso_init_from_sysinfo_ehdr(uintptr_t base);
> +extern void vdso_init_from_auxv(void *auxv);
> +

Please remove these externs. I understand it is must a move.
Might as well clean this up.

Send me v3 for just this one.

thanks,
-- Shuah

^ permalink raw reply	[flat|nested] 5+ messages in thread

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Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-05-21 20:37 [PATCH v2 0/3] selftests: vdso: Add a selftest for vDSO getcpu() Mark Brown
2020-05-21 20:37 ` [PATCH v2 1/3] selftests: vdso: Rename vdso_test to vdso_test_gettimeofday Mark Brown
2020-05-21 20:37 ` [PATCH v2 2/3] selftests: vdso: Use a header file to prototype parse_vdso API Mark Brown
2020-05-22 15:48   ` shuah
2020-05-21 20:37 ` [PATCH v2 3/3] selftests: vdso: Add a selftest for vDSO getcpu() Mark Brown

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Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kselftest


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git