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[PATCH v3] selftests/resctrl: Fix non-contiguous CBM for AMD

Babu Moger posted 1 patch 1 year, 8 months ago 
tools/testing/selftests/resctrl/cat_test.c | 32 +++++++++++++++-------
1 file changed, 22 insertions(+), 10 deletions(-)
[PATCH v3] selftests/resctrl: Fix non-contiguous CBM for AMD
Posted by Babu Moger 1 year, 8 months ago 
The non-contiguous CBM test fails on AMD with:
Starting L3_NONCONT_CAT test ...
Mounting resctrl to "/sys/fs/resctrl"
CPUID output doesn't match 'sparse_masks' file content!
not ok 5 L3_NONCONT_CAT: test

AMD always supports non-contiguous CBM but does not report it via CPUID.

Fix the non-contiguous CBM test to use CPUID to discover non-contiguous
CBM support only on Intel.

Fixes: ae638551ab64 ("selftests/resctrl: Add non-contiguous CBMs CAT test")
Signed-off-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
---
v3: Reworked changelong.

v2: Moved the non-contiguous CBM 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@amd.com/
    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;
 	}
 
-- 
2.34.1
Re: [PATCH v3] selftests/resctrl: Fix non-contiguous CBM for AMD
Posted by Reinette Chatre 1 year, 7 months ago 
Hi Shuah,

Could you please consider this fix for inclusion into kselftests?

Thank you very much.

Reinette

On 6/11/24 3:18 PM, Babu Moger wrote:
> The non-contiguous CBM test fails on AMD with:
> Starting L3_NONCONT_CAT test ...
> Mounting resctrl to "/sys/fs/resctrl"
> CPUID output doesn't match 'sparse_masks' file content!
> not ok 5 L3_NONCONT_CAT: test
> 
> AMD always supports non-contiguous CBM but does not report it via CPUID.
> 
> Fix the non-contiguous CBM test to use CPUID to discover non-contiguous
> CBM support only on Intel.
> 
> Fixes: ae638551ab64 ("selftests/resctrl: Add non-contiguous CBMs CAT test")
> Signed-off-by: Babu Moger <babu.moger@amd.com>
> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
> ---
> v3: Reworked changelong.
> 
> v2: Moved the non-contiguous CBM 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@amd.com/
>      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;
>   	}
>
Re: [PATCH v3] selftests/resctrl: Fix non-contiguous CBM for AMD
Posted by Shuah Khan 1 year, 7 months ago 
On 6/26/24 10:55, Reinette Chatre wrote:
> Hi Shuah,
> 
> Could you please consider this fix for inclusion into kselftests?
> 
> Thank you very much.
> 
> Reinette
> 
> On 6/11/24 3:18 PM, Babu Moger wrote:
>> The non-contiguous CBM test fails on AMD with:
>> Starting L3_NONCONT_CAT test ...
>> Mounting resctrl to "/sys/fs/resctrl"
>> CPUID output doesn't match 'sparse_masks' file content!
>> not ok 5 L3_NONCONT_CAT: test
>>
>> AMD always supports non-contiguous CBM but does not report it via CPUID.
>>
>> Fix the non-contiguous CBM test to use CPUID to discover non-contiguous
>> CBM support only on Intel.
>>
>> Fixes: ae638551ab64 ("selftests/resctrl: Add non-contiguous CBMs CAT test")
>> Signed-off-by: Babu Moger <babu.moger@amd.com>
>> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
>> ---
>> v3: Reworked changelong.
>>
>> v2: Moved the non-contiguous CBM 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@amd.com/
>>      Sending this as a separate fix per review comments.
>> ---
>>   tools/testing/selftests/resctrl/cat_test.c | 32 +++++++++++++++-------
>>   1 file changed, 22 insertions(+), 10 deletions(-)
>>

Applied to linux-kselftest fixes branch for 6.10-rc6

thanks,
-- Shuah
Re: [PATCH v3] selftests/resctrl: Fix non-contiguous CBM for AMD
Posted by Reinette Chatre 1 year, 7 months ago 

On 6/26/24 12:25 PM, Shuah Khan wrote:
> 
> Applied to linux-kselftest fixes branch for 6.10-rc6
> 

Thank you very much Shuah.

Reinette
Re: [PATCH v3] selftests/resctrl: Fix non-contiguous CBM for AMD
Posted by Ilpo Järvinen 1 year, 8 months ago 
On Tue, 11 Jun 2024, Babu Moger wrote:

> The non-contiguous CBM test fails on AMD with:
> Starting L3_NONCONT_CAT test ...
> Mounting resctrl to "/sys/fs/resctrl"
> CPUID output doesn't match 'sparse_masks' file content!
> not ok 5 L3_NONCONT_CAT: test
> 
> AMD always supports non-contiguous CBM but does not report it via CPUID.
> 
> Fix the non-contiguous CBM test to use CPUID to discover non-contiguous
> CBM support only on Intel.
> 
> Fixes: ae638551ab64 ("selftests/resctrl: Add non-contiguous CBMs CAT test")
> Signed-off-by: Babu Moger <babu.moger@amd.com>
> Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>

Thanks.

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

-- 
 i.

> ---
> v3: Reworked changelong.
> 
> v2: Moved the non-contiguous CBM 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@amd.com/
>     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;
>  	}
>  
>

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