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RAS Get State Extension

API

• Functions

  • zesRasGetStateExp

  • zesRasClearStateExp

• Enumerations

  • zes_ras_state_exp_version_t

  • zes_ras_error_category_exp_t

• Structures

  • zes_ras_state_exp_t

RAS State

Reliability, Availability, Serviceability (RAS) is a standard mechanism to report HW errors. In L0 Sysman, we report these errors via RAS API and organized into Correctable or Uncorrectable errors. Furthermore, the errors can be grouped by category so that source of the error is easily identifiable.

This extension is defined with intent to provide an extensible interface to the user for discovering these errors. A separate function is provided to allow users to clear the error counters. This functionality extends and is intended to eventually replace existing mechanism via zesRasGetState.

To that end, this extension also adds new enumerator for RAS error categories. The list of error categories include existing ones (refer to the Sysman Programming guide) and also additional ones which are defined here. The additional error categories are listed below:

Error category	ZES_RAS_ERROR_TYPE_CORRECTABLE	ZES_RAS_ERROR_TYPE_UNCORRECTABLE
ZES_RAS_ERROR_CATEGORY_EXP_MEMORY_ERRORS	Number of ECC correctable errors	Number of ECC uncorrectable errors
that have occurred in memory -	that have occurred in memory -
GDDR/HBM.	GDDR/HBM.
ZES_RAS_ERROR_CATEGORY_EXP_SCALE_ERRORS	Number of correctable errors	Number of ECC uncorrectable errors
that have occurred in scale IP	that have occurred in scale IP
ZES_RAS_ERROR_CATEGORY_EXP_L3FABRIC_ERRORS	Number of ECC correctable errors	Number of ECC uncorrectable errors
that have occurred in L3 fabric	that have occurred in L3 fabric

The following pseudo-code demonstrates a sequence for querying the number of error categories supported by a platform and for obtaining the error counters for these categories.

// Query for number of error categories supported by platform
uint32_t rasCategoryCount = 0;
{s}RasGetStateExp(rasHandle, &rasCategoryCount, nullptr);

zes_ras_state_exp_t* rasStates = (zes_ras_state_exp_t*) allocate(rasCategoryCount * sizeof(zes_ras_state_exp_t));

//Gather error states
{s}RasGetStateExp(rasHandle, &rasCategoryCount, rasStates);

// Print error details
for(uint32_t i = 0; i < rasCategoryCount; i++) {
    output(" Error category: %d, Error count: %llun n", rasStates[i]->category, rasStates[i]->errorCounter);
}

// Clear error counter for specific category, for example PROGRAMMING_ERRORS
{s}RasClearStateExp(rasHandle, ZES_RAS_ERROR_CAT_PROGRAMMING_ERRORS);