linux/drivers/powercap, branch v4.0

powercap / RAPL: handle domains with different energy units

2015-03-13T22:18:44Z

The current driver assumes all RAPL domains within a CPU package have the same energy unit. This is no longer true for HSW server CPUs since DRAM domain has is own fixed energy unit which can be different than the package energy unit enumerated by package power MSR. In fact, the default HSW EP package power unit is 61uJ whereas DRAM domain unit is 15.3uJ. The result is that DRAM power consumption is counted 4x more than real power reported by energy counters, similarly for max_energy_range_uj of DRAM domain. This patch adds domain specific energy unit per cpu type, it allows domain energy unit to override package energy unit if non zero. Please see this document for details. "Intel Xeon Processor E5-1600 and E5-2600 v3 Product Families, Volume 2 of 2. Datasheet, September 2014, Reference Number: 330784-001 " Signed-off-by: Jacob Pan Cc: 3.10+ # 3.10+ Signed-off-by: Rafael J. Wysocki

powercap / RAPL: add IDs for future Xeon CPUs

2014-12-17T01:35:42Z

Enable RAPL driver on Xeon cpu id 0x56. Signed-off-by: Jacob Pan Signed-off-by: Rafael J. Wysocki

powercap / RAPL: fix build dependency on iosf_mbi

2014-11-12T20:09:19Z

RAPL on Atom depends on IOSF_MBI driver for setting floor frequency. This patch adds explicit dependency on CONFIG_IOSF_MB. Signed-off-by: Jacob Pan Signed-off-by: Rafael J. Wysocki

powercap / RAPL: add new model ids

2014-11-11T22:40:06Z

Signed-off-by: Jacob Pan Signed-off-by: Rafael J. Wysocki

powercap / RAPL: handle atom and core differences

2014-11-11T22:40:06Z

RAPL implementation on Atom has made some changes that are not compatible with Core CPUs. Specifically, it is different in the way units are computed as well as floor frequency is enforced. This patch uses the per CPU model functions to handle the differences. Intel Software Developers' Manual has also been updated to reflect the changes in Table 35-7 V3C. Signed-off-by: Ajay Thomas Signed-off-by: Jacob Pan Signed-off-by: Rafael J. Wysocki

powercap / RAPL: abstract per cpu type functions

2014-11-11T22:40:06Z

RAPL implementations may vary slightly between Core and Atom CPUs. There are also potential differences among generations of CPUs within the family. This patch adds a per model structure to abstract the differences such that variations can be handled cleanly. Signed-off-by: Jacob Pan Signed-off-by: Rafael J. Wysocki

powercap / RAPL: change domain detection message

2014-09-02T23:29:00Z

Many CPUs do not support complete set of RAPL domains, as a result this detection failed message is very misleading and can be annoying. [ 5.082632] intel_rapl: RAPL domain core detection failed [ 5.088370] intel_rapl: RAPL domain uncore detection failed So lower the warning message to info and only print out the RAPL domains that are supported. Signed-off-by: Jacob Pan Signed-off-by: Rafael J. Wysocki

powercap / RAPL: add support for CPU model 0x3f

2014-09-02T23:28:02Z

I've confirmed that monitoring the package power usage as well as setting power limits appear to be working as expected. Supports the package and dram domains. Tested aginst cpu: Intel(R) Xeon(R) CPU E5-2650 v3 @ 2.30GHz Signed-off-by: Jason Baron Acked-by: Jacob Pan Signed-off-by: Rafael J. Wysocki

powercap / RAPL: add new CPU IDs

2014-04-30T23:34:51Z

Add support for Broadwell model 0x3d and Haswell model (0x3c). Signed-off-by: Jacob Pan Signed-off-by: Rafael J. Wysocki

powercap / RAPL: further relax energy counter checks

2014-04-30T23:32:20Z

Energy counters may roll slowly for some RAPL domains, checking all of them can be time consuming and takes unpredictable amount of time. Therefore, we relax the sanity check by only checking availability of the MSRs and non-zero value of the energy status counters. It has been shown sufficient for all the platforms tested to filter out inactive domains. Signed-off-by: Jacob Pan Acked-by: Durgadoss R Signed-off-by: Rafael J. Wysocki