[v8,kunit-next,1/4] kunit: add debugfs /sys/kernel/debug/kunit/<suite>/results display
diff mbox series

Message ID 1585232710-322-2-git-send-email-alan.maguire@oracle.com
State Mainlined
Commit e2219db280e3fe52e5cc242e4225dd2685af3c56
Headers show
Series
  • kunit: add debugfs representation to show results
Related show

Commit Message

Alan Maguire March 26, 2020, 2:25 p.m. UTC
add debugfs support for displaying kunit test suite results; this is
especially useful for module-loaded tests to allow disentangling of
test result display from other dmesg events.  debugfs support is
provided if CONFIG_KUNIT_DEBUGFS=y.

As well as printk()ing messages, we append them to a per-test log.

Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Frank Rowand <frank.rowand@sony.com>
---
 include/kunit/test.h   |  54 +++++++++++++++---
 lib/kunit/Kconfig      |   8 +++
 lib/kunit/Makefile     |   4 ++
 lib/kunit/debugfs.c    | 116 ++++++++++++++++++++++++++++++++++++++
 lib/kunit/debugfs.h    |  30 ++++++++++
 lib/kunit/kunit-test.c |   4 +-
 lib/kunit/test.c       | 147 ++++++++++++++++++++++++++++++++++++++-----------
 7 files changed, 322 insertions(+), 41 deletions(-)
 create mode 100644 lib/kunit/debugfs.c
 create mode 100644 lib/kunit/debugfs.h

Comments

shuah April 1, 2020, 5:47 p.m. UTC | #1
Hi Alan,

On 3/26/20 8:25 AM, Alan Maguire wrote:
> add debugfs support for displaying kunit test suite results; this is
> especially useful for module-loaded tests to allow disentangling of
> test result display from other dmesg events.  debugfs support is
> provided if CONFIG_KUNIT_DEBUGFS=y.
> 
> As well as printk()ing messages, we append them to a per-test log.
> 
> Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
> Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
> Reviewed-by: Frank Rowand <frank.rowand@sony.com>
> ---
>   include/kunit/test.h   |  54 +++++++++++++++---
>   lib/kunit/Kconfig      |   8 +++

Missing defaults for config options?

>   lib/kunit/Makefile     |   4 ++
>   lib/kunit/debugfs.c    | 116 ++++++++++++++++++++++++++++++++++++++
>   lib/kunit/debugfs.h    |  30 ++++++++++
>   lib/kunit/kunit-test.c |   4 +-
>   lib/kunit/test.c       | 147 ++++++++++++++++++++++++++++++++++++++-----------
>   7 files changed, 322 insertions(+), 41 deletions(-)
>   create mode 100644 lib/kunit/debugfs.c
>   create mode 100644 lib/kunit/debugfs.h
> 

snip

> diff --git a/lib/kunit/Kconfig b/lib/kunit/Kconfig
> index 065aa16..95d12e3 100644
> --- a/lib/kunit/Kconfig
> +++ b/lib/kunit/Kconfig
> @@ -14,6 +14,14 @@ menuconfig KUNIT
>   
>   if KUNIT
>   
> +config KUNIT_DEBUGFS
> +	bool "KUnit - Enable /sys/kernel/debug/kunit debugfs representation"
> +	help
> +	  Enable debugfs representation for kunit.  Currently this consists
> +	  of /sys/kernel/debug/kunit/<test_suite>/results files for each
> +	  test suite, which allow users to see results of the last test suite
> +	  run that occurred.
> +

Any reason why there is default for this option?

Same for all other options. I am sending pull request for now without
defaults. Would like to see this fixed for rc2.

thanks,
-- Shuah
Alan Maguire April 2, 2020, 3:27 p.m. UTC | #2
On Wed, 1 Apr 2020, shuah wrote:

> Hi Alan,
> 
> On 3/26/20 8:25 AM, Alan Maguire wrote:
> > add debugfs support for displaying kunit test suite results; this is
> > especially useful for module-loaded tests to allow disentangling of
> > test result display from other dmesg events.  debugfs support is
> > provided if CONFIG_KUNIT_DEBUGFS=y.
> > 
> > As well as printk()ing messages, we append them to a per-test log.
> > 
> > Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
> > Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
> > Reviewed-by: Frank Rowand <frank.rowand@sony.com>
> > ---
> >   include/kunit/test.h   |  54 +++++++++++++++---
> >   lib/kunit/Kconfig      |   8 +++
> 
> Missing defaults for config options?
> 
> >   lib/kunit/Makefile     |   4 ++
> >   lib/kunit/debugfs.c    | 116 ++++++++++++++++++++++++++++++++++++++
> >   lib/kunit/debugfs.h    |  30 ++++++++++
> >   lib/kunit/kunit-test.c |   4 +-
> >   lib/kunit/test.c       | 147
> >   ++++++++++++++++++++++++++++++++++++++-----------
> >   7 files changed, 322 insertions(+), 41 deletions(-)
> >   create mode 100644 lib/kunit/debugfs.c
> >   create mode 100644 lib/kunit/debugfs.h
> > 
> 
> snip
> 
> > diff --git a/lib/kunit/Kconfig b/lib/kunit/Kconfig
> > index 065aa16..95d12e3 100644
> > --- a/lib/kunit/Kconfig
> > +++ b/lib/kunit/Kconfig
> > @@ -14,6 +14,14 @@ menuconfig KUNIT
> >   
> >   if KUNIT
> >   
> > +config KUNIT_DEBUGFS
> > +	bool "KUnit - Enable /sys/kernel/debug/kunit debugfs representation"
> > +	help
> > +	  Enable debugfs representation for kunit.  Currently this consists
> > +	  of /sys/kernel/debug/kunit/<test_suite>/results files for each
> > +	  test suite, which allow users to see results of the last test suite
> > +	  run that occurred.
> > +
> 
> Any reason why there is default for this option?
> 
> Same for all other options. I am sending pull request for now without
> defaults. Would like to see this fixed for rc2.
>

Sure, I'll send a patch shortly. Just wanted to get opinions
on what those defaults should be; my working assumption is

- CONFIG_KUNIT should be default n; 
- CONFIG_KUNIT_DEBUGFS should be default y (enabled by default
  if CONFIG_KUNIT is set);
- CONFIG_KUNIT_TEST, CONFIG_KUNIT_EXAMPLE_TEST should be default n

Does this sound right? Thanks!

Alan

> thanks,
> -- Shuah
>
Greg Kroah-Hartman April 2, 2020, 6:38 p.m. UTC | #3
On Thu, Apr 02, 2020 at 04:27:35PM +0100, Alan Maguire wrote:
> On Wed, 1 Apr 2020, shuah wrote:
> 
> > Hi Alan,
> > 
> > On 3/26/20 8:25 AM, Alan Maguire wrote:
> > > add debugfs support for displaying kunit test suite results; this is
> > > especially useful for module-loaded tests to allow disentangling of
> > > test result display from other dmesg events.  debugfs support is
> > > provided if CONFIG_KUNIT_DEBUGFS=y.
> > > 
> > > As well as printk()ing messages, we append them to a per-test log.
> > > 
> > > Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
> > > Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
> > > Reviewed-by: Frank Rowand <frank.rowand@sony.com>
> > > ---
> > >   include/kunit/test.h   |  54 +++++++++++++++---
> > >   lib/kunit/Kconfig      |   8 +++
> > 
> > Missing defaults for config options?
> > 
> > >   lib/kunit/Makefile     |   4 ++
> > >   lib/kunit/debugfs.c    | 116 ++++++++++++++++++++++++++++++++++++++
> > >   lib/kunit/debugfs.h    |  30 ++++++++++
> > >   lib/kunit/kunit-test.c |   4 +-
> > >   lib/kunit/test.c       | 147
> > >   ++++++++++++++++++++++++++++++++++++++-----------
> > >   7 files changed, 322 insertions(+), 41 deletions(-)
> > >   create mode 100644 lib/kunit/debugfs.c
> > >   create mode 100644 lib/kunit/debugfs.h
> > > 
> > 
> > snip
> > 
> > > diff --git a/lib/kunit/Kconfig b/lib/kunit/Kconfig
> > > index 065aa16..95d12e3 100644
> > > --- a/lib/kunit/Kconfig
> > > +++ b/lib/kunit/Kconfig
> > > @@ -14,6 +14,14 @@ menuconfig KUNIT
> > >   
> > >   if KUNIT
> > >   
> > > +config KUNIT_DEBUGFS
> > > +	bool "KUnit - Enable /sys/kernel/debug/kunit debugfs representation"
> > > +	help
> > > +	  Enable debugfs representation for kunit.  Currently this consists
> > > +	  of /sys/kernel/debug/kunit/<test_suite>/results files for each
> > > +	  test suite, which allow users to see results of the last test suite
> > > +	  run that occurred.
> > > +
> > 
> > Any reason why there is default for this option?
> > 
> > Same for all other options. I am sending pull request for now without
> > defaults. Would like to see this fixed for rc2.
> >
> 
> Sure, I'll send a patch shortly. Just wanted to get opinions
> on what those defaults should be; my working assumption is
> 
> - CONFIG_KUNIT should be default n; 

No default means 'n', so there's no need to say that at all.

> - CONFIG_KUNIT_DEBUGFS should be default y (enabled by default
>   if CONFIG_KUNIT is set);

Why?  If it's is 'y', then don't even make it an option at all, just
always have it :)

'y' is almost always reserved for "your machine will not function
properly without this enabled".

> - CONFIG_KUNIT_TEST, CONFIG_KUNIT_EXAMPLE_TEST should be default n

So no need to specify anything, 'n' is the default.

thanks,

greg k-h
Alan Maguire April 3, 2020, 11:58 a.m. UTC | #4
On Thu, 2 Apr 2020, Greg KH wrote:

> On Thu, Apr 02, 2020 at 04:27:35PM +0100, Alan Maguire wrote:
> > On Wed, 1 Apr 2020, shuah wrote:
> > 
> > > Hi Alan,
> > > 
> > > On 3/26/20 8:25 AM, Alan Maguire wrote:
> > > > add debugfs support for displaying kunit test suite results; this is
> > > > especially useful for module-loaded tests to allow disentangling of
> > > > test result display from other dmesg events.  debugfs support is
> > > > provided if CONFIG_KUNIT_DEBUGFS=y.
> > > > 
> > > > As well as printk()ing messages, we append them to a per-test log.
> > > > 
> > > > Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
> > > > Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
> > > > Reviewed-by: Frank Rowand <frank.rowand@sony.com>
> > > > ---
> > > >   include/kunit/test.h   |  54 +++++++++++++++---
> > > >   lib/kunit/Kconfig      |   8 +++
> > > 
> > > Missing defaults for config options?
> > > 
> > > >   lib/kunit/Makefile     |   4 ++
> > > >   lib/kunit/debugfs.c    | 116 ++++++++++++++++++++++++++++++++++++++
> > > >   lib/kunit/debugfs.h    |  30 ++++++++++
> > > >   lib/kunit/kunit-test.c |   4 +-
> > > >   lib/kunit/test.c       | 147
> > > >   ++++++++++++++++++++++++++++++++++++++-----------
> > > >   7 files changed, 322 insertions(+), 41 deletions(-)
> > > >   create mode 100644 lib/kunit/debugfs.c
> > > >   create mode 100644 lib/kunit/debugfs.h
> > > > 
> > > 
> > > snip
> > > 
> > > > diff --git a/lib/kunit/Kconfig b/lib/kunit/Kconfig
> > > > index 065aa16..95d12e3 100644
> > > > --- a/lib/kunit/Kconfig
> > > > +++ b/lib/kunit/Kconfig
> > > > @@ -14,6 +14,14 @@ menuconfig KUNIT
> > > >   
> > > >   if KUNIT
> > > >   
> > > > +config KUNIT_DEBUGFS
> > > > +	bool "KUnit - Enable /sys/kernel/debug/kunit debugfs representation"
> > > > +	help
> > > > +	  Enable debugfs representation for kunit.  Currently this consists
> > > > +	  of /sys/kernel/debug/kunit/<test_suite>/results files for each
> > > > +	  test suite, which allow users to see results of the last test suite
> > > > +	  run that occurred.
> > > > +
> > > 
> > > Any reason why there is default for this option?
> > > 
> > > Same for all other options. I am sending pull request for now without
> > > defaults. Would like to see this fixed for rc2.
> > >
> > 
> > Sure, I'll send a patch shortly. Just wanted to get opinions
> > on what those defaults should be; my working assumption is
> > 
> > - CONFIG_KUNIT should be default n; 
> 
> No default means 'n', so there's no need to say that at all.
> 

Great!

> > - CONFIG_KUNIT_DEBUGFS should be default y (enabled by default
> >   if CONFIG_KUNIT is set);
> 
> Why?  If it's is 'y', then don't even make it an option at all, just
> always have it :)
> 
> 'y' is almost always reserved for "your machine will not function
> properly without this enabled".
>

Okay, so in this case not having a default makes sense I think
(we added the option as saying 'n' avoids allocating per-test
loggging memory which might cause problems on low-memory systems).

> > - CONFIG_KUNIT_TEST, CONFIG_KUNIT_EXAMPLE_TEST should be default n
> 
> So no need to specify anything, 'n' is the default.
>

Excellent! So based on the above seems like we don't need
to add any defaults here I think.  Shuah/Brendan, let me know
if I'm missing anything here. Thanks!

Alan

> thanks,
> 
> greg k-h
>
Marco Elver April 15, 2020, 5:58 p.m. UTC | #5
Hello,

On Thu, 26 Mar 2020, Alan Maguire wrote:

> add debugfs support for displaying kunit test suite results; this is
> especially useful for module-loaded tests to allow disentangling of
> test result display from other dmesg events.  debugfs support is
> provided if CONFIG_KUNIT_DEBUGFS=y.
> 
> As well as printk()ing messages, we append them to a per-test log.
> 
> Signed-off-by: Alan Maguire <alan.maguire@oracle.com>
> Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
> Reviewed-by: Frank Rowand <frank.rowand@sony.com>
> ---
>  include/kunit/test.h   |  54 +++++++++++++++---
>  lib/kunit/Kconfig      |   8 +++
>  lib/kunit/Makefile     |   4 ++
>  lib/kunit/debugfs.c    | 116 ++++++++++++++++++++++++++++++++++++++
>  lib/kunit/debugfs.h    |  30 ++++++++++
>  lib/kunit/kunit-test.c |   4 +-
>  lib/kunit/test.c       | 147 ++++++++++++++++++++++++++++++++++++++-----------
>  7 files changed, 322 insertions(+), 41 deletions(-)
>  create mode 100644 lib/kunit/debugfs.c
>  create mode 100644 lib/kunit/debugfs.h
> 
[...]
> diff --git a/lib/kunit/test.c b/lib/kunit/test.c
> index 9242f93..a3fa21f 100644
> --- a/lib/kunit/test.c
> +++ b/lib/kunit/test.c
[...]
> -static void kunit_print_ok_not_ok(bool should_indent,
> +static void kunit_print_ok_not_ok(void *test_or_suite,
> +				  bool is_test,
>  				  bool is_ok,
>  				  size_t test_number,
>  				  const char *description)
>  {
> -	const char *indent, *ok_not_ok;
> -
> -	if (should_indent)
> -		indent = "\t";
> -	else
> -		indent = "";
> +	struct kunit_suite *suite = is_test ? NULL : test_or_suite;
> +	struct kunit *test = is_test ? test_or_suite : NULL;
>  
> -	if (is_ok)
> -		ok_not_ok = "ok";
> +	/*
> +	 * We do not log the test suite results as doing so would
> +	 * mean debugfs display would consist of the test suite
> +	 * description and status prior to individual test results.
> +	 * Hence directly printk the suite status, and we will
> +	 * separately seq_printf() the suite status for the debugfs
> +	 * representation.
> +	 */
> +	if (suite)
> +		pr_info("%s %zd - %s",

I think this is missing '\n' -- is this intentional?

With v5.7-rc1, when I run a test via module, the final "ok" is only
printed once another message is printed to the kernel log (which can
take a while).

Thanks,
-- Marco

> +			kunit_status_to_string(is_ok),
> +			test_number, description);
>  	else
> -		ok_not_ok = "not ok";
> -
> -	pr_info("%s%s %zd - %s\n", indent, ok_not_ok, test_number, description);
> +		kunit_log(KERN_INFO, test, "\t%s %zd - %s",
> +			  kunit_status_to_string(is_ok),
> +			  test_number, description);
>  }
[...]

Patch
diff mbox series

diff --git a/include/kunit/test.h b/include/kunit/test.h
index 2dfb550..f7b2ed4c 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -81,6 +81,9 @@  struct kunit_resource {
 
 struct kunit;
 
+/* Size of log associated with test. */
+#define KUNIT_LOG_SIZE	512
+
 /**
  * struct kunit_case - represents an individual test case.
  *
@@ -123,8 +126,14 @@  struct kunit_case {
 
 	/* private: internal use only. */
 	bool success;
+	char *log;
 };
 
+static inline char *kunit_status_to_string(bool status)
+{
+	return status ? "ok" : "not ok";
+}
+
 /**
  * KUNIT_CASE - A helper for creating a &struct kunit_case
  *
@@ -157,6 +166,10 @@  struct kunit_suite {
 	int (*init)(struct kunit *test);
 	void (*exit)(struct kunit *test);
 	struct kunit_case *test_cases;
+
+	/* private - internal use only */
+	struct dentry *debugfs;
+	char *log;
 };
 
 /**
@@ -175,6 +188,7 @@  struct kunit {
 
 	/* private: internal use only. */
 	const char *name; /* Read only after initialization! */
+	char *log; /* Points at case log after initialization */
 	struct kunit_try_catch try_catch;
 	/*
 	 * success starts as true, and may only be set to false during a
@@ -193,10 +207,19 @@  struct kunit {
 	struct list_head resources; /* Protected by lock. */
 };
 
-void kunit_init_test(struct kunit *test, const char *name);
+void kunit_init_test(struct kunit *test, const char *name, char *log);
 
 int kunit_run_tests(struct kunit_suite *suite);
 
+size_t kunit_suite_num_test_cases(struct kunit_suite *suite);
+
+unsigned int kunit_test_case_num(struct kunit_suite *suite,
+				 struct kunit_case *test_case);
+
+int __kunit_test_suites_init(struct kunit_suite **suites);
+
+void __kunit_test_suites_exit(struct kunit_suite **suites);
+
 /**
  * kunit_test_suites() - used to register one or more &struct kunit_suite
  *			 with KUnit.
@@ -226,20 +249,22 @@  struct kunit {
 	static struct kunit_suite *suites[] = { __VA_ARGS__, NULL};	\
 	static int kunit_test_suites_init(void)				\
 	{								\
-		unsigned int i;						\
-		for (i = 0; suites[i] != NULL; i++)			\
-			kunit_run_tests(suites[i]);			\
-		return 0;						\
+		return __kunit_test_suites_init(suites);		\
 	}								\
 	late_initcall(kunit_test_suites_init);				\
 	static void __exit kunit_test_suites_exit(void)			\
 	{								\
-		return;							\
+		return __kunit_test_suites_exit(suites);		\
 	}								\
 	module_exit(kunit_test_suites_exit)
 
 #define kunit_test_suite(suite)	kunit_test_suites(&suite)
 
+#define kunit_suite_for_each_test_case(suite, test_case)		\
+	for (test_case = suite->test_cases; test_case->run_case; test_case++)
+
+bool kunit_suite_has_succeeded(struct kunit_suite *suite);
+
 /*
  * Like kunit_alloc_resource() below, but returns the struct kunit_resource
  * object that contains the allocation. This is mostly for testing purposes.
@@ -356,8 +381,21 @@  static inline void *kunit_kzalloc(struct kunit *test, size_t size, gfp_t gfp)
 
 void kunit_cleanup(struct kunit *test);
 
-#define kunit_printk(lvl, test, fmt, ...) \
-	printk(lvl "\t# %s: " fmt, (test)->name, ##__VA_ARGS__)
+void kunit_log_append(char *log, const char *fmt, ...);
+
+/*
+ * printk and log to per-test or per-suite log buffer.  Logging only done
+ * if CONFIG_KUNIT_DEBUGFS is 'y'; if it is 'n', no log is allocated/used.
+ */
+#define kunit_log(lvl, test_or_suite, fmt, ...)				\
+	do {								\
+		printk(lvl fmt, ##__VA_ARGS__);				\
+		kunit_log_append((test_or_suite)->log,	fmt "\n",	\
+				 ##__VA_ARGS__);			\
+	} while (0)
+
+#define kunit_printk(lvl, test, fmt, ...)				\
+	kunit_log(lvl, test, "\t# %s: " fmt, (test)->name, ##__VA_ARGS__)
 
 /**
  * kunit_info() - Prints an INFO level message associated with @test.
diff --git a/lib/kunit/Kconfig b/lib/kunit/Kconfig
index 065aa16..95d12e3 100644
--- a/lib/kunit/Kconfig
+++ b/lib/kunit/Kconfig
@@ -14,6 +14,14 @@  menuconfig KUNIT
 
 if KUNIT
 
+config KUNIT_DEBUGFS
+	bool "KUnit - Enable /sys/kernel/debug/kunit debugfs representation"
+	help
+	  Enable debugfs representation for kunit.  Currently this consists
+	  of /sys/kernel/debug/kunit/<test_suite>/results files for each
+	  test suite, which allow users to see results of the last test suite
+	  run that occurred.
+
 config KUNIT_TEST
 	tristate "KUnit test for KUnit"
 	help
diff --git a/lib/kunit/Makefile b/lib/kunit/Makefile
index fab5564..724b943 100644
--- a/lib/kunit/Makefile
+++ b/lib/kunit/Makefile
@@ -5,6 +5,10 @@  kunit-objs +=				test.o \
 					assert.o \
 					try-catch.o
 
+ifeq ($(CONFIG_KUNIT_DEBUGFS),y)
+kunit-objs +=				debugfs.o
+endif
+
 obj-$(CONFIG_KUNIT_TEST) +=		kunit-test.o
 
 # string-stream-test compiles built-in only.
diff --git a/lib/kunit/debugfs.c b/lib/kunit/debugfs.c
new file mode 100644
index 0000000..9214c49
--- /dev/null
+++ b/lib/kunit/debugfs.c
@@ -0,0 +1,116 @@ 
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2020, Oracle and/or its affiliates.
+ *    Author: Alan Maguire <alan.maguire@oracle.com>
+ */
+
+#include <linux/debugfs.h>
+#include <linux/module.h>
+
+#include <kunit/test.h>
+
+#include "string-stream.h"
+
+#define KUNIT_DEBUGFS_ROOT             "kunit"
+#define KUNIT_DEBUGFS_RESULTS          "results"
+
+/*
+ * Create a debugfs representation of test suites:
+ *
+ * Path						Semantics
+ * /sys/kernel/debug/kunit/<testsuite>/results	Show results of last run for
+ *						testsuite
+ *
+ */
+
+static struct dentry *debugfs_rootdir;
+
+void kunit_debugfs_cleanup(void)
+{
+	debugfs_remove_recursive(debugfs_rootdir);
+}
+
+void kunit_debugfs_init(void)
+{
+	if (!debugfs_rootdir)
+		debugfs_rootdir = debugfs_create_dir(KUNIT_DEBUGFS_ROOT, NULL);
+}
+
+static void debugfs_print_result(struct seq_file *seq,
+				 struct kunit_suite *suite,
+				 struct kunit_case *test_case)
+{
+	if (!test_case || !test_case->log)
+		return;
+
+	seq_printf(seq, "%s", test_case->log);
+}
+
+/*
+ * /sys/kernel/debug/kunit/<testsuite>/results shows all results for testsuite.
+ */
+static int debugfs_print_results(struct seq_file *seq, void *v)
+{
+	struct kunit_suite *suite = (struct kunit_suite *)seq->private;
+	bool success = kunit_suite_has_succeeded(suite);
+	struct kunit_case *test_case;
+
+	if (!suite || !suite->log)
+		return 0;
+
+	seq_printf(seq, "%s", suite->log);
+
+	kunit_suite_for_each_test_case(suite, test_case)
+		debugfs_print_result(seq, suite, test_case);
+
+	seq_printf(seq, "%s %d - %s\n",
+		   kunit_status_to_string(success), 1, suite->name);
+	return 0;
+}
+
+static int debugfs_release(struct inode *inode, struct file *file)
+{
+	return single_release(inode, file);
+}
+
+static int debugfs_results_open(struct inode *inode, struct file *file)
+{
+	struct kunit_suite *suite;
+
+	suite = (struct kunit_suite *)inode->i_private;
+
+	return single_open(file, debugfs_print_results, suite);
+}
+
+static const struct file_operations debugfs_results_fops = {
+	.open = debugfs_results_open,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = debugfs_release,
+};
+
+void kunit_debugfs_create_suite(struct kunit_suite *suite)
+{
+	struct kunit_case *test_case;
+
+	/* Allocate logs before creating debugfs representation. */
+	suite->log = kzalloc(KUNIT_LOG_SIZE, GFP_KERNEL);
+	kunit_suite_for_each_test_case(suite, test_case)
+		test_case->log = kzalloc(KUNIT_LOG_SIZE, GFP_KERNEL);
+
+	suite->debugfs = debugfs_create_dir(suite->name, debugfs_rootdir);
+
+	debugfs_create_file(KUNIT_DEBUGFS_RESULTS, S_IFREG | 0444,
+			    suite->debugfs,
+			    suite, &debugfs_results_fops);
+}
+
+void kunit_debugfs_destroy_suite(struct kunit_suite *suite)
+{
+	struct kunit_case *test_case;
+
+	debugfs_remove_recursive(suite->debugfs);
+	kfree(suite->log);
+	kunit_suite_for_each_test_case(suite, test_case)
+		kfree(test_case->log);
+}
diff --git a/lib/kunit/debugfs.h b/lib/kunit/debugfs.h
new file mode 100644
index 0000000..dcc7d75
--- /dev/null
+++ b/lib/kunit/debugfs.h
@@ -0,0 +1,30 @@ 
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (C) 2020, Oracle and/or its affiliates.
+ */
+
+#ifndef _KUNIT_DEBUGFS_H
+#define _KUNIT_DEBUGFS_H
+
+#include <kunit/test.h>
+
+#ifdef CONFIG_KUNIT_DEBUGFS
+
+void kunit_debugfs_create_suite(struct kunit_suite *suite);
+void kunit_debugfs_destroy_suite(struct kunit_suite *suite);
+void kunit_debugfs_init(void);
+void kunit_debugfs_cleanup(void);
+
+#else
+
+static inline void kunit_debugfs_create_suite(struct kunit_suite *suite) { }
+
+static inline void kunit_debugfs_destroy_suite(struct kunit_suite *suite) { }
+
+static inline void kunit_debugfs_init(void) { }
+
+static inline void kunit_debugfs_cleanup(void) { }
+
+#endif /* CONFIG_KUNIT_DEBUGFS */
+
+#endif /* _KUNIT_DEBUGFS_H */
diff --git a/lib/kunit/kunit-test.c b/lib/kunit/kunit-test.c
index ccb8d2e..aceb5bf 100644
--- a/lib/kunit/kunit-test.c
+++ b/lib/kunit/kunit-test.c
@@ -134,7 +134,7 @@  static void kunit_resource_test_init_resources(struct kunit *test)
 {
 	struct kunit_test_resource_context *ctx = test->priv;
 
-	kunit_init_test(&ctx->test, "testing_test_init_test");
+	kunit_init_test(&ctx->test, "testing_test_init_test", NULL);
 
 	KUNIT_EXPECT_TRUE(test, list_empty(&ctx->test.resources));
 }
@@ -301,7 +301,7 @@  static int kunit_resource_test_init(struct kunit *test)
 
 	test->priv = ctx;
 
-	kunit_init_test(&ctx->test, "test_test_context");
+	kunit_init_test(&ctx->test, "test_test_context", NULL);
 
 	return 0;
 }
diff --git a/lib/kunit/test.c b/lib/kunit/test.c
index 9242f93..a3fa21f 100644
--- a/lib/kunit/test.c
+++ b/lib/kunit/test.c
@@ -10,6 +10,7 @@ 
 #include <linux/kernel.h>
 #include <linux/sched/debug.h>
 
+#include "debugfs.h"
 #include "string-stream.h"
 #include "try-catch-impl.h"
 
@@ -28,73 +29,116 @@  static void kunit_print_tap_version(void)
 	}
 }
 
-static size_t kunit_test_cases_len(struct kunit_case *test_cases)
+/*
+ * Append formatted message to log, size of which is limited to
+ * KUNIT_LOG_SIZE bytes (including null terminating byte).
+ */
+void kunit_log_append(char *log, const char *fmt, ...)
+{
+	char line[KUNIT_LOG_SIZE];
+	va_list args;
+	int len_left;
+
+	if (!log)
+		return;
+
+	len_left = KUNIT_LOG_SIZE - strlen(log) - 1;
+	if (len_left <= 0)
+		return;
+
+	va_start(args, fmt);
+	vsnprintf(line, sizeof(line), fmt, args);
+	va_end(args);
+
+	strncat(log, line, len_left);
+}
+EXPORT_SYMBOL_GPL(kunit_log_append);
+
+size_t kunit_suite_num_test_cases(struct kunit_suite *suite)
 {
 	struct kunit_case *test_case;
 	size_t len = 0;
 
-	for (test_case = test_cases; test_case->run_case; test_case++)
+	kunit_suite_for_each_test_case(suite, test_case)
 		len++;
 
 	return len;
 }
+EXPORT_SYMBOL_GPL(kunit_suite_num_test_cases);
 
 static void kunit_print_subtest_start(struct kunit_suite *suite)
 {
 	kunit_print_tap_version();
-	pr_info("\t# Subtest: %s\n", suite->name);
-	pr_info("\t1..%zd\n", kunit_test_cases_len(suite->test_cases));
+	kunit_log(KERN_INFO, suite, "\t# Subtest: %s", suite->name);
+	kunit_log(KERN_INFO, suite, "\t1..%zd",
+		  kunit_suite_num_test_cases(suite));
 }
 
-static void kunit_print_ok_not_ok(bool should_indent,
+static void kunit_print_ok_not_ok(void *test_or_suite,
+				  bool is_test,
 				  bool is_ok,
 				  size_t test_number,
 				  const char *description)
 {
-	const char *indent, *ok_not_ok;
-
-	if (should_indent)
-		indent = "\t";
-	else
-		indent = "";
+	struct kunit_suite *suite = is_test ? NULL : test_or_suite;
+	struct kunit *test = is_test ? test_or_suite : NULL;
 
-	if (is_ok)
-		ok_not_ok = "ok";
+	/*
+	 * We do not log the test suite results as doing so would
+	 * mean debugfs display would consist of the test suite
+	 * description and status prior to individual test results.
+	 * Hence directly printk the suite status, and we will
+	 * separately seq_printf() the suite status for the debugfs
+	 * representation.
+	 */
+	if (suite)
+		pr_info("%s %zd - %s",
+			kunit_status_to_string(is_ok),
+			test_number, description);
 	else
-		ok_not_ok = "not ok";
-
-	pr_info("%s%s %zd - %s\n", indent, ok_not_ok, test_number, description);
+		kunit_log(KERN_INFO, test, "\t%s %zd - %s",
+			  kunit_status_to_string(is_ok),
+			  test_number, description);
 }
 
-static bool kunit_suite_has_succeeded(struct kunit_suite *suite)
+bool kunit_suite_has_succeeded(struct kunit_suite *suite)
 {
 	const struct kunit_case *test_case;
 
-	for (test_case = suite->test_cases; test_case->run_case; test_case++)
+	kunit_suite_for_each_test_case(suite, test_case) {
 		if (!test_case->success)
 			return false;
+	}
 
 	return true;
 }
+EXPORT_SYMBOL_GPL(kunit_suite_has_succeeded);
 
 static void kunit_print_subtest_end(struct kunit_suite *suite)
 {
 	static size_t kunit_suite_counter = 1;
 
-	kunit_print_ok_not_ok(false,
+	kunit_print_ok_not_ok((void *)suite, false,
 			      kunit_suite_has_succeeded(suite),
 			      kunit_suite_counter++,
 			      suite->name);
 }
 
-static void kunit_print_test_case_ok_not_ok(struct kunit_case *test_case,
-					    size_t test_number)
+unsigned int kunit_test_case_num(struct kunit_suite *suite,
+				 struct kunit_case *test_case)
 {
-	kunit_print_ok_not_ok(true,
-			      test_case->success,
-			      test_number,
-			      test_case->name);
+	struct kunit_case *tc;
+	unsigned int i = 1;
+
+	kunit_suite_for_each_test_case(suite, tc) {
+		if (tc == test_case)
+			return i;
+		i++;
+	}
+
+	return 0;
 }
+EXPORT_SYMBOL_GPL(kunit_test_case_num);
 
 static void kunit_print_string_stream(struct kunit *test,
 				      struct string_stream *stream)
@@ -102,6 +146,9 @@  static void kunit_print_string_stream(struct kunit *test,
 	struct string_stream_fragment *fragment;
 	char *buf;
 
+	if (string_stream_is_empty(stream))
+		return;
+
 	buf = string_stream_get_string(stream);
 	if (!buf) {
 		kunit_err(test,
@@ -175,11 +222,14 @@  void kunit_do_assertion(struct kunit *test,
 }
 EXPORT_SYMBOL_GPL(kunit_do_assertion);
 
-void kunit_init_test(struct kunit *test, const char *name)
+void kunit_init_test(struct kunit *test, const char *name, char *log)
 {
 	spin_lock_init(&test->lock);
 	INIT_LIST_HEAD(&test->resources);
 	test->name = name;
+	test->log = log;
+	if (test->log)
+		test->log[0] = '\0';
 	test->success = true;
 }
 EXPORT_SYMBOL_GPL(kunit_init_test);
@@ -290,7 +340,7 @@  static void kunit_run_case_catch_errors(struct kunit_suite *suite,
 	struct kunit_try_catch *try_catch;
 	struct kunit test;
 
-	kunit_init_test(&test, test_case->name);
+	kunit_init_test(&test, test_case->name, test_case->log);
 	try_catch = &test.try_catch;
 
 	kunit_try_catch_init(try_catch,
@@ -303,19 +353,20 @@  static void kunit_run_case_catch_errors(struct kunit_suite *suite,
 	kunit_try_catch_run(try_catch, &context);
 
 	test_case->success = test.success;
+
+	kunit_print_ok_not_ok(&test, true, test_case->success,
+			      kunit_test_case_num(suite, test_case),
+			      test_case->name);
 }
 
 int kunit_run_tests(struct kunit_suite *suite)
 {
 	struct kunit_case *test_case;
-	size_t test_case_count = 1;
 
 	kunit_print_subtest_start(suite);
 
-	for (test_case = suite->test_cases; test_case->run_case; test_case++) {
+	kunit_suite_for_each_test_case(suite, test_case)
 		kunit_run_case_catch_errors(suite, test_case);
-		kunit_print_test_case_ok_not_ok(test_case, test_case_count++);
-	}
 
 	kunit_print_subtest_end(suite);
 
@@ -323,6 +374,37 @@  int kunit_run_tests(struct kunit_suite *suite)
 }
 EXPORT_SYMBOL_GPL(kunit_run_tests);
 
+static void kunit_init_suite(struct kunit_suite *suite)
+{
+	kunit_debugfs_create_suite(suite);
+}
+
+int __kunit_test_suites_init(struct kunit_suite **suites)
+{
+	unsigned int i;
+
+	for (i = 0; suites[i] != NULL; i++) {
+		kunit_init_suite(suites[i]);
+		kunit_run_tests(suites[i]);
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(__kunit_test_suites_init);
+
+static void kunit_exit_suite(struct kunit_suite *suite)
+{
+	kunit_debugfs_destroy_suite(suite);
+}
+
+void __kunit_test_suites_exit(struct kunit_suite **suites)
+{
+	unsigned int i;
+
+	for (i = 0; suites[i] != NULL; i++)
+		kunit_exit_suite(suites[i]);
+}
+EXPORT_SYMBOL_GPL(__kunit_test_suites_exit);
+
 struct kunit_resource *kunit_alloc_and_get_resource(struct kunit *test,
 						    kunit_resource_init_t init,
 						    kunit_resource_free_t free,
@@ -489,12 +571,15 @@  void kunit_cleanup(struct kunit *test)
 
 static int __init kunit_init(void)
 {
+	kunit_debugfs_init();
+
 	return 0;
 }
 late_initcall(kunit_init);
 
 static void __exit kunit_exit(void)
 {
+	kunit_debugfs_cleanup();
 }
 module_exit(kunit_exit);