linux-rng/drivers/powercap, branch master

powercap: intel_rapl: Enable MSR-based RAPL PMU support

2025-11-21T20:47:08Z

Currently, RAPL PMU support requires adding CPU model entries to arch/x86/events/rapl.c for each new generation. However, RAPL MSRs are not architectural and require platform-specific customization, making arch/x86 an inappropriate location for this functionality. The powercap subsystem already handles RAPL functionality and is the natural place to consolidate all RAPL features. The powercap RAPL driver already includes PMU support for TPMI-based RAPL interfaces, making it straightforward to extend this support to MSR-based RAPL interfaces as well. This consolidation eliminates the need to maintain RAPL support in multiple subsystems and provides a unified approach for both TPMI and MSR-based RAPL implementations. The MSR-based PMU support includes the following updates: 1. Register MSR-based PMU support for the supported platforms and unregister it when no online CPUs remain in the package. 2. Remove existing checks that restrict RAPL PMU support to TPMI-based interfaces and extend the logic to allow MSR-based RAPL interfaces. 3. Define a CPU model list to determine which processors should register RAPL PMU interface through the powercap driver for MSR-based RAPL, excluding those that support TPMI interface. This list prevents conflicts with existing arch/x86 PMU code that already registers RAPL PMU for some processors. Add Panther Lake & Wildcat Lake to the CPU models list. Signed-off-by: Kuppuswamy Sathyanarayanan Reviewed-by: Srinivas Pandruvada [ rjw: Changelog edits ] Link: https://patch.msgid.link/20251121000539.386069-3-sathyanarayanan.kuppuswamy@linux.intel.com Signed-off-by: Rafael J. Wysocki

powercap: intel_rapl: Prepare read_raw() interface for atomic-context callers

2025-11-21T20:47:08Z

The current read_raw() implementation of the TPMI, MMIO and MSR interfaces does not distinguish between atomic and non-atomic callers. rapl_msr_read_raw() uses rdmsrq_safe_on_cpu(), which can sleep and issue cross CPU calls. When MSR-based RAPL PMU support is enabled, PMU event handlers can invoke this function from atomic context where sleeping or rescheduling is not allowed. In atomic context, the caller is already executing on the target CPU, so a direct rdmsrq() is sufficient. To support such usage, introduce an atomic flag to the read_raw() interface to allow callers pass the context information. Modify the common RAPL code to propagate this flag, and set the flag to reflect the calling contexts. Utilize the atomic flag in rapl_msr_read_raw() to perform direct MSR read with rdmsrq() when running in atomic context, and a sanity check to ensure target CPU matches the current CPU for such use cases. The TPMI and MMIO implementations do not require special atomic handling, so the flag is ignored in those paths. This is a preparatory patch for adding MSR-based RAPL PMU support. Signed-off-by: Kuppuswamy Sathyanarayanan Reviewed-by: Srinivas Pandruvada [ rjw: Subject tweak ] Link: https://patch.msgid.link/20251121000539.386069-2-sathyanarayanan.kuppuswamy@linux.intel.com Signed-off-by: Rafael J. Wysocki

powercap: intel_rapl: Add support for Nova Lake processors

2025-11-18T14:39:29Z

Add RAPL support for Intel Nova Lake and Nova Lake L processors using the core defaults configuration. Signed-off-by: Kaushlendra Kumar [ rjw: Subject and changelog edits, rebase ] Link: https://patch.msgid.link/20251028101814.3482508-1-kaushlendra.kumar@intel.com Signed-off-by: Rafael J. Wysocki

powercap: intel_rapl: Add support for Wildcat Lake platform

2025-10-30T19:15:02Z

Add Wildcat Lake to the list of supported processors for RAPL. Signed-off-by: Srinivas Pandruvada Link: https://patch.msgid.link/20251023174532.1882008-1-srinivas.pandruvada@linux.intel.com Signed-off-by: Rafael J. Wysocki

powercap: idle_inject: use us_to_ktime() where appropriate

2025-08-21T19:57:54Z

Convert values in microseconds to ktime using us_to_ktime() instead of multiplying them by NSEC_PER_USEC and using ns_to_ktime() for the conversion. Signed-off-by: Xichao Zhao Link: https://patch.msgid.link/20250813075433.464786-1-zhao.xichao@vivo.com [ rjw: Subject and changelog edits ] Signed-off-by: Rafael J. Wysocki

Merge tag 'platform-drivers-x86-v6.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86

2025-07-29T06:21:28Z

Pull x86 platform drivers from Ilpo Järvinen: - alienware: Add more precise labels to fans - amd/hsmp: Improve misleading probe errors (make the legacy driver aware when HSMP is supported through the ACPI driver) - amd/pmc: Add Lenovo Yoga 6 13ALCL6 to pmc quirk list - drm/xe: Correct (D)VSEC information to support PMT crashlog feature - fujitsu: Clamp charge threshold instead of returning an error - ideapad: Expore change types - intel/pmt: - Add PMT Discovery driver - Add API to retrieve telemetry regions by feature - Fix crashlog NULL access - Support Battlemage GPU (BMG) crashlog - intel/vsec: - Add Discovery feature - Add feature dependency support using device links - lenovo: - Move lenovo drivers under drivers/platform/x86/lenovo/ - Add WMI drivers for Lenovo Gaming series - Improve DMI handling - oxpec: - Add support for OneXPlayer X1 Mini Pro (Strix Point variant) - Fix EC registers for G1 AMD - samsung-laptop: Expose change types - wmi: Fix WMI device naming issue (same GUID corner cases) - x86-android-tables: Add ovc-capacity-table to generic battery nodes - Miscellaneous cleanups / refactoring / improvements * tag 'platform-drivers-x86-v6.17-1' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86: (63 commits) platform/x86: oxpec: Add support for OneXPlayer X1 Mini Pro (Strix Point) platform/x86: oxpec: Fix turbo register for G1 AMD platform/x86/intel/pmt: support BMG crashlog platform/x86/intel/pmt: use a version struct platform/x86/intel/pmt: refactor base parameter platform/x86/intel/pmt: add register access helpers platform/x86/intel/pmt: decouple sysfs and namespace platform/x86/intel/pmt: correct types platform/x86/intel/pmt: re-order trigger logic platform/x86/intel/pmt: use guard(mutex) platform/x86/intel/pmt: mutex clean up platform/x86/intel/pmt: white space cleanup drm/xe: Correct BMG VSEC header sizing drm/xe: Correct the rev value for the DVSEC entries platform/x86/intel/pmt: fix a crashlog NULL pointer access platform/x86: samsung-laptop: Expose charge_types platform/x86/amd: pmc: Add Lenovo Yoga 6 13ALC6 to pmc quirk list platform/x86: dell-uart-backlight: Use blacklight power constant platform/x86/intel/pmt: fix build dependency for kunit test platform/x86: lenovo: gamezone needs "other mode" ...

powercap: dtpm_cpu: Fix NULL pointer dereference in get_pd_power_uw()

2025-07-03T15:19:37Z

The get_pd_power_uw() function can crash with a NULL pointer dereference when em_cpu_get() returns NULL. This occurs when a CPU becomes impossible during runtime, causing get_cpu_device() to return NULL, which propagates through em_cpu_get() and leads to a crash when em_span_cpus() dereferences the NULL pointer. Add a NULL check after em_cpu_get() and return 0 if unavailable, matching the existing fallback behavior in __dtpm_cpu_setup(). Fixes: eb82bace8931 ("powercap/drivers/dtpm: Scale the power with the load") Signed-off-by: Sivan Zohar-Kotzer Link: https://patch.msgid.link/20250701221355.96916-1-sivany32@gmail.com [ rjw: Drop an excess empty code line ] Signed-off-by: Rafael J. Wysocki

platform/x86/intel/tpmi: Relocate platform info to intel_vsec.h

2025-07-03T08:09:35Z

The TPMI platform information provides a mapping of OOBMSM PCI devices to logical CPUs. Since this mapping is consistent across all OOBMSM features (e.g., TPMI, PMT, SDSi), it can be leveraged by multiple drivers. To facilitate reuse, relocate the struct intel_tpmi_plat_info to intel_vsec.h, renaming it to struct oobmsm_plat_info, making it accessible to other features. While modifying headers, place them in alphabetical order. Signed-off-by: David E. Box Reviewed-by: Ilpo Järvinen Link: https://lore.kernel.org/r/20250703022832.1302928-11-david.e.box@linux.intel.com Signed-off-by: Ilpo Järvinen

powercap: intel_rapl: Add support for Bartlett Lake platform

2025-06-30T18:34:57Z

Add Bartlett Lake to the list of supported processors in the RAPL common driver. Acked-by: Zhang Rui Signed-off-by: Qiao Wei [ rjw: Changelog edits ] Signed-off-by: Rafael J. Wysocki

powercap: intel_rapl_msr: Add PL4 support for Panther Lake

2025-06-30T18:34:57Z

Add Panther Lake to the list of processors where PL4 is supported. Signed-off-by: Zhang Rui Link: https://patch.msgid.link/20250625020522.253548-1-rui.zhang@intel.com Signed-off-by: Rafael J. Wysocki