From d9a0788093565c300f7c8dd034dbfa6ac4da9aa6 Mon Sep 17 00:00:00 2001 From: "David E. Box" Date: Wed, 2 Jul 2025 19:28:23 -0700 Subject: platform/x86/intel/pmt: Add PMT Discovery driver MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This patch introduces a new driver to enumerate and expose Intel Platform Monitoring Technology (PMT) capabilities via a simple discovery mechanism. The PMT Discovery driver parses hardware-provided discovery tables from Intel Out of Band Management Services Modules (OOBMSM) and extracts feature information for various providers (such as TPMI, Telemetry, Crash Log, etc). This unified interface simplifies the process of determining which manageability and telemetry features are supported by a given platform. This new feature is described in the Intel Platform Monitoring Technology 3.0 specification, section 6.6 Capability. Key changes and additions: New file drivers/platform/x86/intel/pmt/discovery.c: – Implements the discovery logic to map the discovery resource, read the feature discovery table, and validate feature parameters. New file drivers/platform/x86/intel/pmt/features.c: – Defines feature names, layouts, and associated capability masks. – Provides a mapping between raw hardware attributes and sysfs representations for easier integration with user-space tools. New header include/linux/intel_pmt_features.h: – Declares constants, masks, and feature identifiers used across the PMT framework. Sysfs integration: – Feature attributes are exposed under /sys/class/intel_pmt. – Each device is represented by a subfolder within the intel_pmt class, named using its DBDF (Domain:Bus:Device.Function), e.g.: features-0000:00:03.1 – Example directory layout for a device: /sys/class/intel_pmt/features-0000:00:03.1/ ├── accelerator_telemetry ├── crash_log ├── per_core_environment_telemetry ├── per_core_performance_telemetry ├── per_rmid_energy_telemetry ├── per_rmid_perf_telemetry ├── tpmi_control ├── tracing └── uncore_telemetry By exposing PMT feature details through sysfs and integrating with the existing PMT class, this driver paves the way for more streamlined integration of PMT-based manageability and telemetry tools. Link: https://www.intel.com/content/www/us/en/content-details/710389/intel-platform-monitoring-technology-intel-pmt-external-specification.html Signed-off-by: David E. Box Link: https://lore.kernel.org/r/20250703022832.1302928-9-david.e.box@linux.intel.com Reviewed-by: Ilpo Järvinen Signed-off-by: Ilpo Järvinen --- drivers/platform/x86/intel/pmt/class.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'drivers/platform/x86/intel/pmt/class.h') diff --git a/drivers/platform/x86/intel/pmt/class.h b/drivers/platform/x86/intel/pmt/class.h index b2006d57779d..39c32357ee2c 100644 --- a/drivers/platform/x86/intel/pmt/class.h +++ b/drivers/platform/x86/intel/pmt/class.h @@ -20,6 +20,7 @@ #define GET_ADDRESS(v) ((v) & GENMASK(31, 3)) struct pci_dev; +extern struct class intel_pmt_class; struct telem_endpoint { struct pci_dev *pcidev; @@ -48,6 +49,7 @@ struct intel_pmt_entry { unsigned long base_addr; size_t size; u32 guid; + u32 num_rmids; /* Number of Resource Monitoring IDs */ int devid; }; -- cgit v1.2.3