| fcdf1797e1f8f6605b194e620a333e6d47e07672 |
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02-Sep-2014 |
Jacob Pan <jacob.jun.pan@linux.intel.com> |
powercap / RAPL: change domain detection message
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 <jacob.jun.pan@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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| 64c7569c065564a066bb44161f904b4afc9f3e3a |
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14-Aug-2014 |
Jason Baron <jbaron@akamai.com> |
powercap / RAPL: add support for CPU model 0x3f
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 <jbaron@akamai.com>
Acked-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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| a97ac35b5d9e948ccfcbc04c69e9d2c94e788e94 |
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30-Apr-2014 |
Jacob Pan <jacob.jun.pan@linux.intel.com> |
powercap / RAPL: add new CPU IDs
Add support for Broadwell model 0x3d and Haswell model (0x3c).
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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| 9d31c676c6019df0c078950a0ddca87da4706b14 |
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30-Apr-2014 |
Jacob Pan <jacob.jun.pan@linux.intel.com> |
powercap / RAPL: further relax energy counter checks
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 <jacob.jun.pan@linux.intel.com>
Acked-by: Durgadoss R <durgadoss.r@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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| 009f225ef050d231ebb7b87264a21a7daac0f175 |
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10-Mar-2014 |
Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> |
powercap, intel-rapl: Fix CPU hotplug callback registration
Subsystems that want to register CPU hotplug callbacks, as well as perform
initialization for the CPUs that are already online, often do it as shown
below:
get_online_cpus();
for_each_online_cpu(cpu)
init_cpu(cpu);
register_cpu_notifier(&foobar_cpu_notifier);
put_online_cpus();
This is wrong, since it is prone to ABBA deadlocks involving the
cpu_add_remove_lock and the cpu_hotplug.lock (when running concurrently
with CPU hotplug operations).
Instead, the correct and race-free way of performing the callback
registration is:
cpu_notifier_register_begin();
for_each_online_cpu(cpu)
init_cpu(cpu);
/* Note the use of the double underscored version of the API */
__register_cpu_notifier(&foobar_cpu_notifier);
cpu_notifier_register_done();
Fix the intel-rapl code in the powercap driver by using this latter form
of callback registration. But retain the calls to get/put_online_cpus(),
since they also protect the function rapl_cleanup_data(). By nesting
get/put_online_cpus() *inside* cpu_notifier_register_begin/done(), we avoid
the ABBA deadlock possibility mentioned above.
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Tested-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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| d6b2e6d09aa18738dd29277617a186fa827bd7e1 |
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10-Feb-2014 |
Jacob Pan <jacob.jun.pan@linux.intel.com> |
powercap / intel_rapl: spell out SoC names
Spell out names for supported SoCs.
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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| 7b8747725d0a6842a82ea60fe95b9d4d7ae008fd |
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10-Feb-2014 |
Jacob Pan <jacob.jun.pan@linux.intel.com> |
powercap / intel_rapl: relax sanity check on energy counters
Some RAPL domains may not be active at the time driver is being
loaded. Checking energy counter increment may be too strict and
time consuming. So relax the sanity check on energy counters of
these domains.
Otherwise, they may be ignored and become unavailable to the
powercap framework.
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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| ed93b71492da3464b4798613aa8a99bed914251b |
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11-Dec-2013 |
Jacob Pan <jacob.jun.pan@linux.intel.com> |
powercap / RAPL: add support for ValleyView Soc
This patch adds support for RAPL on Intel ValleyView based SoC
platforms, such as Baytrail.
Besides adding CPU ID, special energy unit encoding is handled
for ValleyView.
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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| 2d281d8196e38dd3a4ee9af26621ddde8329f269 |
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17-Oct-2013 |
Jacob Pan <jacob.jun.pan@linux.intel.com> |
PowerCap: Introduce Intel RAPL power capping driver
The Intel Running Average Power Limit (RAPL) technology provides platform
software with the ability to monitor, control, and get notifications on
power usage.
This feature is present in all Sandy Bridge and later Intel processors.
Newer models allow more fine grained controls to be applied. In RAPL,
power control is divided into domains, which include package, DRAM
controller, CPU core (Power Plane 0), graphics uncore (power plane 1), etc.
The purpose of this driver is to expose the RAPL settings to userspace.
Overall, RAPL fits in the new powercap class driver in that platform
level power capping controls are exposed via this generic interface.
This driver is based on an earlier patch from Zhang Rui.
However, while the previous work was mainly focused on thermal monitoring
the focus here is on the usability from user space perspective.
References: https://lkml.org/lkml/2011/5/26/93
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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