platform/x86/intel/ifs: Add SBAF test support

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In a core, the SBAF test engine is shared between sibling CPUs.

An SBAF test image contains multiple bundles. Each bundle is further
composed of subunits called programs. When a SBAF test (for a particular
core) is triggered by the user, each SBAF bundle from the loaded test
image is executed sequentially on all the threads on the core using
the stop_core_cpuslocked mechanism. Each bundle execution is initiated by
writing to MSR_ACTIVATE_SBAF.

SBAF test bundle execution may be aborted when an interrupt occurs or
if the CPU does not have enough power budget for the test. In these
cases the kernel restarts the test from the aborted bundle. SBAF
execution is not retried if the test fails or if the test makes no
forward progress after 5 retries.

Reviewed-by: Ashok Raj <ashok.raj@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Jithu Joseph <jithu.joseph@intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Link: https://lore.kernel.org/r/20240801051814.1935149-4-sathyanarayanan.kuppuswamy@linux.intel.com
Signed-off-by: Hans de Goede <hdegoede@redhat.com>

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Jithu Joseph 2024-08-01 05:18:13 +00:00 • committed by Hans de Goede

parent 0a3e4e94d1

commit 3c4d06bd6e

2 changed files with 262 additions and 0 deletions

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30

drivers/platform/x86/intel/ifs/ifs.h

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232

drivers/platform/x86/intel/ifs/runtest.c

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