[PATCH 1/8] sptests/spcache01: Detect write-through cache

[Gedare Bloom]

The logic here is that a write-through cache will have written back
the lines in vdata, whereas a write-back cache won't since there are
no cache conflicts before the invalidation. Did you run this test on a
write-through target to verify it works as expected?

On Wed, Feb 26, 2014 at 10:52 AM, Sebastian Huber
<sebastian.huber at embedded-brains.de> wrote:
> ---
>  testsuites/sptests/spcache01/init.c        |   17 ++++++++++++++---
>  testsuites/sptests/spcache01/spcache01.scn |    1 +
>  2 files changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/testsuites/sptests/spcache01/init.c b/testsuites/sptests/spcache01/init.c
> index 9f27a79..d9eb053 100644
> --- a/testsuites/sptests/spcache01/init.c
> +++ b/testsuites/sptests/spcache01/init.c
> @@ -44,6 +44,7 @@ static void test_data_flush_and_invalidate(void)
>      int n = 32;
>      int i;
>      size_t data_size = n * sizeof(data[0]);
> +    bool write_through;
>
>      printf("data cache flush and invalidate test\n");
>
> @@ -65,8 +66,15 @@ static void test_data_flush_and_invalidate(void)
>
>      rtems_cache_invalidate_multiple_data_lines(&data[0], data_size);
>
> -    for (i = 0; i < n; ++i) {
> -      rtems_test_assert(vdata[i] == i);
> +    write_through = vdata[0] == ~0;
> +    if (write_through) {
> +      for (i = 0; i < n; ++i) {
> +        rtems_test_assert(vdata[i] == ~i);
> +      }
> +    } else {
> +      for (i = 0; i < n; ++i) {
> +        rtems_test_assert(vdata[i] == i);
> +      }
>      }
>
>      for (i = 0; i < n; ++i) {
> @@ -82,7 +90,10 @@ static void test_data_flush_and_invalidate(void)
>
>      rtems_interrupt_lock_release(&lock, level);
>
> -    printf("data cache operations by line passed the test\n");
> +    printf(
> +      "data cache operations by line passed the test (%s cache detected)\n",
> +      write_through ? "write-through" : "copy-back"
> +    );
>    } else {
>      printf(
>        "skip data cache flush and invalidate test"
> diff --git a/testsuites/sptests/spcache01/spcache01.scn b/testsuites/sptests/spcache01/spcache01.scn
> index 45ea3e5..c2f1eb6 100644
> --- a/testsuites/sptests/spcache01/spcache01.scn
> +++ b/testsuites/sptests/spcache01/spcache01.scn
> @@ -1,6 +1,7 @@
>  *** TEST SPCACHE 1 ***
>  data cache flush and invalidate test
>  data cache operations by line passed the test
> +data cache operations by line passed the test (copy-back cache detected)
>  data cache line size 32 bytes
>  load 4096 bytes with flush entire data
>    duration with normal cache 12660 ns
> --
> 1.7.7
>
> _______________________________________________
> rtems-devel mailing list
> rtems-devel at rtems.org
> http://www.rtems.org/mailman/listinfo/rtems-devel