On Mon, 10 Jun 2024, Babu Moger wrote:
> The selftest noncont_cat_run_test fails on AMD with the warnings. Reason
noncont_cat_run_test()
(In general, use () when refering to a function, same thing in the
shortlog).
"the warnings" sounds like I should know about what warning it fails with
but there's no previous context which tells that information. I suggest
you either use "a warning" or quote the warning it fails with into the
commit message.
> is, AMD supports non contiguous CBM masks but does not report it via CPUID.
non-contiguous
> Update noncont_cat_run_test to check for the vendor when verifying CPUID.
()
> Fixes: ae638551ab64 ("selftests/resctrl: Add non-contiguous CBMs CAT test")
> Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
> ---
> v2: Moved the non contiguous verification to a new function
> arch_supports_noncont_cat.
>
> v1:
> This was part of the series
> https://lore.kernel.org/lkml/cover.1708637563.git.babu.moger@xxxxxxx/
> Sending this as a separate fix per review comments.
> ---
> tools/testing/selftests/resctrl/cat_test.c | 32 +++++++++++++++-------
> 1 file changed, 22 insertions(+), 10 deletions(-)
>
> diff --git a/tools/testing/selftests/resctrl/cat_test.c b/tools/testing/selftests/resctrl/cat_test.c
> index d4dffc934bc3..742782438ca3 100644
> --- a/tools/testing/selftests/resctrl/cat_test.c
> +++ b/tools/testing/selftests/resctrl/cat_test.c
> @@ -288,11 +288,30 @@ static int cat_run_test(const struct resctrl_test *test, const struct user_param
> return ret;
> }
>
> +static bool arch_supports_noncont_cat(const struct resctrl_test *test)
> +{
> + unsigned int eax, ebx, ecx, edx;
> +
> + /* AMD always supports non-contiguous CBM. */
> + if (get_vendor() == ARCH_AMD)
> + return true;
> +
> + /* Intel support for non-contiguous CBM needs to be discovered. */
> + if (!strcmp(test->resource, "L3"))
> + __cpuid_count(0x10, 1, eax, ebx, ecx, edx);
> + else if (!strcmp(test->resource, "L2"))
> + __cpuid_count(0x10, 2, eax, ebx, ecx, edx);
> + else
> + return false;
> +
> + return ((ecx >> 3) & 1);
> +}
> +
> static int noncont_cat_run_test(const struct resctrl_test *test,
> const struct user_params *uparams)
> {
> unsigned long full_cache_mask, cont_mask, noncont_mask;
> - unsigned int eax, ebx, ecx, edx, sparse_masks;
> + unsigned int sparse_masks;
> int bit_center, ret;
> char schemata[64];
>
> @@ -301,15 +320,8 @@ static int noncont_cat_run_test(const struct resctrl_test *test,
> if (ret)
> return ret;
>
> - if (!strcmp(test->resource, "L3"))
> - __cpuid_count(0x10, 1, eax, ebx, ecx, edx);
> - else if (!strcmp(test->resource, "L2"))
> - __cpuid_count(0x10, 2, eax, ebx, ecx, edx);
> - else
> - return -EINVAL;
> -
> - if (sparse_masks != ((ecx >> 3) & 1)) {
> - ksft_print_msg("CPUID output doesn't match 'sparse_masks' file content!\n");
> + if (arch_supports_noncont_cat(test) != sparse_masks) {
> + ksft_print_msg("Hardware and kernel differ on non-contiguous CBM support!\n");
> return 1;
This looks better than the previous version, thanks.
--
i.
