linux-kernel - Re: [PATCH 3/4] selftests/resctrl: Add support for MBM and MBA tests on AMD

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Message-ID: <fd71d5f7-08b8-4042-b94a-e81cc68c975b@amd.com>
Date: Fri, 23 Feb 2024 13:47:55 -0600
From: "Moger, Babu" <babu.moger@....com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: fenghua.yu@...el.com, Reinette Chatre <reinette.chatre@...el.com>,
 shuah@...nel.org, LKML <linux-kernel@...r.kernel.org>,
 linux-kselftest@...r.kernel.org,
 Maciej Wieczór-Retman <maciej.wieczor-retman@...el.com>,
 peternewman@...gle.com, eranian@...gle.com
Subject: Re: [PATCH 3/4] selftests/resctrl: Add support for MBM and MBA tests
 on AMD



On 2/23/24 13:30, Moger, Babu wrote:
> Hi Ilpo,
> 
> On 2/23/24 04:53, Ilpo Järvinen wrote:
>> On Thu, 22 Feb 2024, Babu Moger wrote:
>>
>>> Add support to read UMC (Unified Memory Controller) perf events to compare
>>> the numbers with QoS monitor for AMD.
>>>
>>> Signed-off-by: Babu Moger <babu.moger@....com>
>>> ---
>>>  .../testing/selftests/resctrl/resctrl_tests.c |  6 +-
>>>  tools/testing/selftests/resctrl/resctrl_val.c | 62 +++++++++++++++++--
>>>  2 files changed, 58 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/tools/testing/selftests/resctrl/resctrl_tests.c b/tools/testing/selftests/resctrl/resctrl_tests.c
>>> index 2bbe3045a018..231233b8d354 100644
>>> --- a/tools/testing/selftests/resctrl/resctrl_tests.c
>>> +++ b/tools/testing/selftests/resctrl/resctrl_tests.c
>>> @@ -104,8 +104,7 @@ static void run_mbm_test(const char * const *benchmark_cmd, int cpu_no)
>>>  	}
>>>  
>>>  	if (!validate_resctrl_feature_request("L3_MON", "mbm_total_bytes") ||
>>> -	    !validate_resctrl_feature_request("L3_MON", "mbm_local_bytes") ||
>>> -	    (get_vendor() != ARCH_INTEL)) {
>>> +	    !validate_resctrl_feature_request("L3_MON", "mbm_local_bytes")) {
>>>  		ksft_test_result_skip("Hardware does not support MBM or MBM is disabled\n");
>>>  		goto cleanup;
>>>  	}
>>> @@ -131,8 +130,7 @@ static void run_mba_test(const char * const *benchmark_cmd, int cpu_no)
>>>  	}
>>>  
>>>  	if (!validate_resctrl_feature_request("MB", NULL) ||
>>> -	    !validate_resctrl_feature_request("L3_MON", "mbm_local_bytes") ||
>>> -	    (get_vendor() != ARCH_INTEL)) {
>>> +	    !validate_resctrl_feature_request("L3_MON", "mbm_local_bytes")) {
>>>  		ksft_test_result_skip("Hardware does not support MBA or MBA is disabled\n");
>>>  		goto cleanup;
>>>  	}
>>
>> These need to be rebased as this code moved into per test files with the 
>> generic test framework. The .vendor_specific field is the new way to make 
>> tests limited to particular vendors.
> 
> Hmm. I picked the latest code from tip/master. Where is the latest code
> now? Is it yet to be submitted?
> 
> I can wait for your code to merge first.

Oh. ok. Here it is
https://lore.kernel.org/lkml/cover.1708072203.git.maciej.wieczor-retman@intel.com/

I will rebase it on top of this next revision.

Thanks
Babu

> 
>>
>>> diff --git a/tools/testing/selftests/resctrl/resctrl_val.c b/tools/testing/selftests/resctrl/resctrl_val.c
>>> index 792116d3565f..c5a4607aa9d9 100644
>>> --- a/tools/testing/selftests/resctrl/resctrl_val.c
>>> +++ b/tools/testing/selftests/resctrl/resctrl_val.c
>>> @@ -11,6 +11,7 @@
>>>  #include "resctrl.h"
>>>  
>>>  #define UNCORE_IMC		"uncore_imc"
>>> +#define AMD_UMC			"amd_umc"
>>>  #define READ_FILE_NAME		"events/cas_count_read"
>>>  #define WRITE_FILE_NAME		"events/cas_count_write"
>>>  #define DYN_PMU_PATH		"/sys/bus/event_source/devices"
>>> @@ -146,6 +147,47 @@ static int open_perf_event(int i, int cpu_no, int j)
>>>  	return 0;
>>>  }
>>>  
>>> +/* Get type and config (read and write) of an UMC counter */
>>> +static int read_from_umc_dir(char *umc_dir, int count)
>>> +{
>>> +	char umc_counter_type[1024];
>>
>> PATH_MAX
> 
> ok.
>>
>>> +	FILE *fp;
>>> +
>>> +	/* Get type of iMC counter */
>>> +	sprintf(umc_counter_type, "%s%s", umc_dir, "type");
>>> +	fp = fopen(umc_counter_type, "r");
>>> +	if (!fp) {
>>> +		perror("Failed to open imc counter type file");
>>
>> Please don't add new perror() anymore, I just managed to clean up those
>> in favor of ksft_perror().
> 
> Ok. Will look into it.
>>
>>> +
>>
>> Drop this newline (to slowly move towards more concise error handling 
>> blocks w/o all those extra newlines).
> 
> ok.
> 
>>
>>> +		return -1;
>>
>>
>>> +	}
>>> +	if (fscanf(fp, "%u", &imc_counters_config[count][READ].type) <= 0) {
>>> +		perror("Could not get imc type");
>>
>> Ditto.
> 
> ok
> 
>>
>>> +		fclose(fp);
>>> +		return -1;
>>> +	}
>>> +
>>> +	fclose(fp);
>>> +
>>> +	imc_counters_config[count][WRITE].type =
>>> +		imc_counters_config[count][READ].type;
>>> +
>>> +	/*
>>> +	 * Setup the event and umasks for UMC events
>>> +	 * Number of CAS commands sent for reads:
>>> +	 * EventCode = 0x0a, umask = 0x1
>>> +	 * Number of CAS commands sent for writes:
>>> +	 * EventCode = 0x0a, umask = 0x2
>>> +	 */
>>> +	imc_counters_config[count][READ].event = 0xa;
>>> +	imc_counters_config[count][READ].umask = 0x1;
>>> +
>>> +	imc_counters_config[count][WRITE].event = 0xa;
>>> +	imc_counters_config[count][WRITE].umask = 0x2;
>>> +
>>> +	return 0;
>>> +}
>>> +
>>>  /* Get type and config (read and write) of an iMC counter */
>>>  static int read_from_imc_dir(char *imc_dir, int count)
>>>  {
>>
> 

-- 
Thanks
Babu Moger